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/*
* DPP functionality shared between hostapd and wpa_supplicant
* Copyright (c) 2017, Qualcomm Atheros, Inc.
* Copyright (c) 2018-2019, The Linux Foundation
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include <fcntl.h>
#include "utils/common.h"
#include "common/defs.h"
#include "utils/base64.h"
#include "utils/json.h"
#include "crypto/crypto.h"
#include "crypto/random.h"
#include "crypto/aes.h"
#include "crypto/aes_siv.h"
#include "crypto/sha256.h"
#include "dpp.h"
#include "dpp_i.h"
#include "esp_dpp_i.h"
static const char * dpp_netrole_str(enum dpp_netrole netrole);
#ifdef CONFIG_TESTING_OPTIONS
enum dpp_test_behavior dpp_test = DPP_TEST_DISABLED;
u8 dpp_protocol_key_override[600];
size_t dpp_protocol_key_override_len = 0;
u8 dpp_nonce_override[DPP_MAX_NONCE_LEN];
size_t dpp_nonce_override_len = 0;
int dpp_test_gen_invalid_key(struct wpabuf *msg,
const struct dpp_curve_params *curve);
#endif /* CONFIG_TESTING_OPTIONS */
struct dpp_global {
void *msg_ctx;
struct dl_list bootstrap; /* struct dpp_bootstrap_info */
struct dl_list configurator; /* struct dpp_configurator */
};
extern struct dpp_curve_params dpp_curves[];
#define TRANSACTION_ID_ATTR_SET_LEN 5
#define CONNECTOR_ATTR_SET_LEN 4
static struct wpabuf *
gas_build_req(u8 action, u8 dialog_token, size_t size)
{
struct wpabuf *buf;
buf = wpabuf_alloc(100 + size);
if (buf == NULL)
return NULL;
wpabuf_put_u8(buf, WLAN_ACTION_PUBLIC);
wpabuf_put_u8(buf, action);
wpabuf_put_u8(buf, dialog_token);
return buf;
}
struct wpabuf * gas_build_initial_req(u8 dialog_token, size_t size)
{
return gas_build_req(WLAN_PA_GAS_INITIAL_REQ, dialog_token,
size);
}
void dpp_debug_print_point(const char *title, struct crypto_ec *e,
const struct crypto_ec_point *point)
{
u8 x[64], y[64];
if (crypto_ec_point_to_bin(e, point, x, y) < 0) {
wpa_printf(MSG_ERROR, "Failed to get coordinates");
return;
}
wpa_printf(MSG_DEBUG, "%s (%s,%s)", title, x, y);
}
static void dpp_auth_fail(struct dpp_authentication *auth, const char *txt)
{
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_FAIL "%s", txt);
}
struct wpabuf * dpp_alloc_msg(enum dpp_public_action_frame_type type,
size_t len)
{
struct wpabuf *msg;
msg = wpabuf_alloc(8 + len);
if (!msg)
return NULL;
wpabuf_put_u8(msg, WLAN_ACTION_PUBLIC);
wpabuf_put_u8(msg, WLAN_PA_VENDOR_SPECIFIC);
wpabuf_put_be24(msg, OUI_WFA);
wpabuf_put_u8(msg, DPP_OUI_TYPE);
wpabuf_put_u8(msg, 1); /* Crypto Suite */
wpabuf_put_u8(msg, type);
return msg;
}
const u8 * dpp_get_attr(const u8 *buf, size_t len, u16 req_id, u16 *ret_len)
{
u16 id, alen;
const u8 *pos = buf, *end = buf + len;
while (end - pos >= 4) {
id = WPA_GET_LE16(pos);
pos += 2;
alen = WPA_GET_LE16(pos);
pos += 2;
if (alen > end - pos)
return NULL;
if (id == req_id) {
*ret_len = alen;
return pos;
}
pos += alen;
}
return NULL;
}
static const u8 * dpp_get_attr_next(const u8 *prev, const u8 *buf, size_t len,
u16 req_id, u16 *ret_len)
{
u16 id, alen;
const u8 *pos, *end = buf + len;
if (!prev)
pos = buf;
else
pos = prev + WPA_GET_LE16(prev - 2);
while (end - pos >= 4) {
id = WPA_GET_LE16(pos);
pos += 2;
alen = WPA_GET_LE16(pos);
pos += 2;
if (alen > end - pos)
return NULL;
if (id == req_id) {
*ret_len = alen;
return pos;
}
pos += alen;
}
return NULL;
}
int dpp_check_attrs(const u8 *buf, size_t len)
{
const u8 *pos, *end;
int wrapped_data = 0;
pos = buf;
end = buf + len;
while (end - pos >= 4) {
u16 id, alen;
id = WPA_GET_LE16(pos);
pos += 2;
alen = WPA_GET_LE16(pos);
pos += 2;
wpa_printf(MSG_MSGDUMP, "DPP: Attribute ID %04x len %u",
id, alen);
if (alen > end - pos) {
wpa_printf(MSG_DEBUG,
"DPP: Truncated message - not enough room for the attribute - dropped");
return -1;
}
if (wrapped_data) {
wpa_printf(MSG_DEBUG,
"DPP: An unexpected attribute included after the Wrapped Data attribute");
return -1;
}
if (id == DPP_ATTR_WRAPPED_DATA)
wrapped_data = 1;
pos += alen;
}
if (end != pos) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected octets (%d) after the last attribute",
(int) (end - pos));
return -1;
}
return 0;
}
void dpp_bootstrap_info_free(struct dpp_bootstrap_info *info)
{
if (!info)
return;
os_free(info->uri);
os_free(info->info);
os_free(info->chan);
os_free(info->pk);
crypto_ec_key_deinit(info->pubkey);
os_free(info);
}
const char * dpp_bootstrap_type_txt(enum dpp_bootstrap_type type)
{
switch (type) {
case DPP_BOOTSTRAP_QR_CODE:
return "QRCODE";
case DPP_BOOTSTRAP_PKEX:
return "PKEX";
case DPP_BOOTSTRAP_NFC_URI:
return "NFC-URI";
}
return "??";
}
static int dpp_uri_valid_info(const char *info)
{
while (*info) {
unsigned char val = *info++;
if (val < 0x20 || val > 0x7e || val == 0x3b)
return 0;
}
return 1;
}
static int dpp_clone_uri(struct dpp_bootstrap_info *bi, const char *uri)
{
bi->uri = os_strdup(uri);
return bi->uri ? 0 : -1;
}
int dpp_parse_uri_chan_list(struct dpp_bootstrap_info *bi,
const char *chan_list)
{
#ifndef ESP_SUPPLICANT
const char *pos = chan_list, *pos2;
int opclass = -1, channel, freq;
while (pos && *pos && *pos != ';') {
pos2 = pos;
while (*pos2 >= '0' && *pos2 <= '9')
pos2++;
if (*pos2 == '/') {
opclass = atoi(pos);
pos = pos2 + 1;
}
if (opclass <= 0)
goto fail;
channel = atoi(pos);
if (channel <= 0)
goto fail;
while (*pos >= '0' && *pos <= '9')
pos++;
freq = ieee80211_chan_to_freq(NULL, opclass, channel);
wpa_printf(MSG_DEBUG,
"DPP: URI channel-list: opclass=%d channel=%d ==> freq=%d",
opclass, channel, freq);
if (freq < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Ignore unknown URI channel-list channel (opclass=%d channel=%d)",
opclass, channel);
} else if (bi->num_freq == DPP_BOOTSTRAP_MAX_FREQ) {
wpa_printf(MSG_DEBUG,
"DPP: Too many channels in URI channel-list - ignore list");
bi->num_freq = 0;
break;
} else {
bi->freq[bi->num_freq++] = freq;
}
if (*pos == ';' || *pos == '\0')
break;
if (*pos != ',')
goto fail;
pos++;
}
return 0;
fail:
wpa_printf(MSG_DEBUG, "DPP: Invalid URI channel-list");
return -1;
#endif
return 0;
}
int dpp_parse_uri_mac(struct dpp_bootstrap_info *bi, const char *mac)
{
if (!mac)
return 0;
if (hwaddr_aton2(mac, bi->mac_addr) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Invalid URI mac");
return -1;
}
wpa_printf(MSG_DEBUG, "DPP: URI mac: " MACSTR, MAC2STR(bi->mac_addr));
return 0;
}
int dpp_parse_uri_info(struct dpp_bootstrap_info *bi, const char *info)
{
const char *end;
if (!info)
return 0;
end = os_strchr(info, ';');
if (!end)
end = info + os_strlen(info);
bi->info = os_malloc(end - info + 1);
if (!bi->info)
return -1;
os_memcpy(bi->info, info, end - info);
bi->info[end - info] = '\0';
wpa_printf(MSG_DEBUG, "DPP: URI(information): %s", bi->info);
if (!dpp_uri_valid_info(bi->info)) {
wpa_printf(MSG_DEBUG, "DPP: Invalid URI information payload");
return -1;
}
return 0;
}
static int dpp_parse_uri_pk(struct dpp_bootstrap_info *bi, const char *info)
{
const char *end;
u8 *data;
size_t data_len;
int res;
end = os_strchr(info, ';');
if (!end)
return -1;
data = (unsigned char *)base64_decode(info, end - info, &data_len);
if (!data) {
wpa_printf(MSG_DEBUG,
"DPP: Invalid base64 encoding on URI public-key");
return -1;
}
wpa_hexdump(MSG_DEBUG, "DPP: Base64 decoded URI public-key",
data, data_len);
res = dpp_get_subject_public_key(bi, data, data_len);
os_free(data);
return res;
}
static struct dpp_bootstrap_info * dpp_parse_uri(const char *uri)
{
const char *pos = uri;
const char *end;
const char *chan_list = NULL, *mac = NULL, *info = NULL, *pk = NULL;
struct dpp_bootstrap_info *bi;
wpa_hexdump_ascii(MSG_DEBUG, "DPP: URI", (u8 *)uri, os_strlen(uri));
if (os_strncmp(pos, "DPP:", 4) != 0) {
wpa_printf(MSG_INFO, "DPP: Not a DPP URI");
return NULL;
}
pos += 4;
for (;;) {
end = os_strchr(pos, ';');
if (!end)
break;
if (end == pos) {
/* Handle terminating ";;" and ignore unexpected ";"
* for parsing robustness. */
pos++;
continue;
}
if (pos[0] == 'C' && pos[1] == ':' && !chan_list)
chan_list = pos + 2;
else if (pos[0] == 'M' && pos[1] == ':' && !mac)
mac = pos + 2;
else if (pos[0] == 'I' && pos[1] == ':' && !info)
info = pos + 2;
else if (pos[0] == 'K' && pos[1] == ':' && !pk)
pk = pos + 2;
else
wpa_hexdump_ascii(MSG_DEBUG,
"DPP: Ignore unrecognized URI parameter",
(u8 *)pos, end - pos);
pos = end + 1;
}
if (!pk) {
wpa_printf(MSG_INFO, "DPP: URI missing public-key");
return NULL;
}
bi = os_zalloc(sizeof(*bi));
if (!bi)
return NULL;
if (dpp_clone_uri(bi, uri) < 0 ||
dpp_parse_uri_chan_list(bi, chan_list) < 0 ||
dpp_parse_uri_mac(bi, mac) < 0 ||
dpp_parse_uri_info(bi, info) < 0 ||
dpp_parse_uri_pk(bi, pk) < 0) {
dpp_bootstrap_info_free(bi);
bi = NULL;
}
return bi;
}
static void dpp_build_attr_status(struct wpabuf *msg,
enum dpp_status_error status)
{
wpa_printf(MSG_DEBUG, "DPP: Status %d", status);
wpabuf_put_le16(msg, DPP_ATTR_STATUS);
wpabuf_put_le16(msg, 1);
wpabuf_put_u8(msg, status);
}
static void dpp_build_attr_r_bootstrap_key_hash(struct wpabuf *msg,
const u8 *hash)
{
if (hash) {
wpa_printf(MSG_DEBUG, "DPP: R-Bootstrap Key Hash");
wpabuf_put_le16(msg, DPP_ATTR_R_BOOTSTRAP_KEY_HASH);
wpabuf_put_le16(msg, SHA256_MAC_LEN);
wpabuf_put_data(msg, hash, SHA256_MAC_LEN);
}
}
static void dpp_build_attr_i_bootstrap_key_hash(struct wpabuf *msg,
const u8 *hash)
{
if (hash) {
wpa_printf(MSG_DEBUG, "DPP: I-Bootstrap Key Hash");
wpabuf_put_le16(msg, DPP_ATTR_I_BOOTSTRAP_KEY_HASH);
wpabuf_put_le16(msg, SHA256_MAC_LEN);
wpabuf_put_data(msg, hash, SHA256_MAC_LEN);
}
}
static struct wpabuf * dpp_auth_build_req(struct dpp_authentication *auth,
const struct wpabuf *pi,
size_t nonce_len,
const u8 *r_pubkey_hash,
const u8 *i_pubkey_hash,
unsigned int neg_freq)
{
struct wpabuf *msg;
u8 clear[4 + DPP_MAX_NONCE_LEN + 4 + 1];
u8 wrapped_data[4 + DPP_MAX_NONCE_LEN + 4 + 1 + AES_BLOCK_SIZE];
u8 *pos;
const u8 *addr[2];
size_t len[2], siv_len, attr_len;
u8 *attr_start, *attr_end;
/* Build DPP Authentication Request frame attributes */
attr_len = 2 * (4 + SHA256_MAC_LEN) + 4 + (pi ? wpabuf_len(pi) : 0) +
4 + sizeof(wrapped_data);
if (neg_freq > 0)
attr_len += 4 + 2;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_REQ)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_alloc_msg(DPP_PA_AUTHENTICATION_REQ, attr_len);
if (!msg)
return NULL;
attr_start = wpabuf_put(msg, 0);
/* Responder Bootstrapping Key Hash */
dpp_build_attr_r_bootstrap_key_hash(msg, r_pubkey_hash);
/* Initiator Bootstrapping Key Hash */
dpp_build_attr_i_bootstrap_key_hash(msg, i_pubkey_hash);
/* Initiator Protocol Key */
if (pi) {
wpabuf_put_le16(msg, DPP_ATTR_I_PROTOCOL_KEY);
wpabuf_put_le16(msg, wpabuf_len(pi));
wpabuf_put_buf(msg, pi);
}
/* Channel */
if (neg_freq > 0) {
//TODO correct and fill
u8 op_class = 81, channel = 6;
wpabuf_put_le16(msg, DPP_ATTR_CHANNEL);
wpabuf_put_le16(msg, 2);
wpabuf_put_u8(msg, op_class);
wpabuf_put_u8(msg, channel);
}
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
goto skip_wrapped_data;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* Wrapped data ({I-nonce, I-capabilities}k1) */
pos = clear;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_I_NONCE_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-nonce");
goto skip_i_nonce;
}
if (dpp_test == DPP_TEST_INVALID_I_NONCE_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid I-nonce");
WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE);
pos += 2;
WPA_PUT_LE16(pos, nonce_len - 1);
pos += 2;
os_memcpy(pos, auth->i_nonce, nonce_len - 1);
pos += nonce_len - 1;
goto skip_i_nonce;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* I-nonce */
WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE);
pos += 2;
WPA_PUT_LE16(pos, nonce_len);
pos += 2;
os_memcpy(pos, auth->i_nonce, nonce_len);
pos += nonce_len;
#ifdef CONFIG_TESTING_OPTIONS
skip_i_nonce:
if (dpp_test == DPP_TEST_NO_I_CAPAB_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-capab");
goto skip_i_capab;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* I-capabilities */
WPA_PUT_LE16(pos, DPP_ATTR_I_CAPABILITIES);
pos += 2;
WPA_PUT_LE16(pos, 1);
pos += 2;
auth->i_capab = auth->allowed_roles;
*pos++ = auth->i_capab;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_ZERO_I_CAPAB) {
wpa_printf(MSG_INFO, "DPP: TESTING - zero I-capabilities");
pos[-1] = 0;
}
skip_i_capab:
#endif /* CONFIG_TESTING_OPTIONS */
attr_end = wpabuf_put(msg, 0);
/* OUI, OUI type, Crypto Suite, DPP frame type */
addr[0] = wpabuf_head_u8(msg) + 2;
len[0] = 3 + 1 + 1 + 1;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
/* Attributes before Wrapped Data */
addr[1] = attr_start;
len[1] = attr_end - attr_start;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
siv_len = pos - clear;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", clear, siv_len);
if (aes_siv_encrypt(auth->k1, auth->curve->hash_len, clear, siv_len,
2, addr, len, wrapped_data) < 0) {
wpabuf_free(msg);
return NULL;
}
siv_len += AES_BLOCK_SIZE;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, siv_len);
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, siv_len);
wpabuf_put_data(msg, wrapped_data, siv_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump_buf(MSG_DEBUG,
"DPP: Authentication Request frame attributes", msg);
return msg;
}
static struct wpabuf * dpp_auth_build_resp(struct dpp_authentication *auth,
enum dpp_status_error status,
const struct wpabuf *pr,
size_t nonce_len,
const u8 *r_pubkey_hash,
const u8 *i_pubkey_hash,
const u8 *r_nonce, const u8 *i_nonce,
const u8 *wrapped_r_auth,
size_t wrapped_r_auth_len,
const u8 *siv_key)
{
struct wpabuf *msg;
#define DPP_AUTH_RESP_CLEAR_LEN 2 * (4 + DPP_MAX_NONCE_LEN) + 4 + 1 + \
4 + 4 + DPP_MAX_HASH_LEN + AES_BLOCK_SIZE
u8 clear[DPP_AUTH_RESP_CLEAR_LEN];
u8 wrapped_data[DPP_AUTH_RESP_CLEAR_LEN + AES_BLOCK_SIZE];
const u8 *addr[2];
size_t len[2], siv_len, attr_len;
u8 *attr_start, *attr_end, *pos;
auth->waiting_auth_conf = 1;
auth->auth_resp_tries = 0;
auth->auth_resp_status = status;
/* Build DPP Authentication Response frame attributes */
attr_len = 4 + 1 + 2 * (4 + SHA256_MAC_LEN) +
4 + (pr ? wpabuf_len(pr) : 0) + 4 + sizeof(wrapped_data);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_RESP)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_alloc_msg(DPP_PA_AUTHENTICATION_RESP, attr_len);
if (!msg)
return NULL;
attr_start = wpabuf_put(msg, 0);
/* DPP Status */
if (status != 255)
dpp_build_attr_status(msg, status);
/* Responder Bootstrapping Key Hash */
dpp_build_attr_r_bootstrap_key_hash(msg, r_pubkey_hash);
/* Initiator Bootstrapping Key Hash (mutual authentication) */
dpp_build_attr_i_bootstrap_key_hash(msg, i_pubkey_hash);
/* Responder Protocol Key */
if (pr) {
wpabuf_put_le16(msg, DPP_ATTR_R_PROTOCOL_KEY);
wpabuf_put_le16(msg, wpabuf_len(pr));
wpabuf_put_buf(msg, pr);
}
attr_end = wpabuf_put(msg, 0);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
goto skip_wrapped_data;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* Wrapped data ({R-nonce, I-nonce, R-capabilities, {R-auth}ke}k2) */
pos = clear;
if (r_nonce) {
/* R-nonce */
WPA_PUT_LE16(pos, DPP_ATTR_R_NONCE);
pos += 2;
WPA_PUT_LE16(pos, nonce_len);
pos += 2;
os_memcpy(pos, r_nonce, nonce_len);
pos += nonce_len;
}
if (i_nonce) {
/* I-nonce */
WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE);
pos += 2;
WPA_PUT_LE16(pos, nonce_len);
pos += 2;
os_memcpy(pos, i_nonce, nonce_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_I_NONCE_MISMATCH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - I-nonce mismatch");
pos[nonce_len / 2] ^= 0x01;
}
#endif /* CONFIG_TESTING_OPTIONS */
pos += nonce_len;
}
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_R_CAPAB_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-capab");
goto skip_r_capab;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* R-capabilities */
WPA_PUT_LE16(pos, DPP_ATTR_R_CAPABILITIES);
pos += 2;
WPA_PUT_LE16(pos, 1);
pos += 2;
auth->r_capab = auth->configurator ? DPP_CAPAB_CONFIGURATOR :
DPP_CAPAB_ENROLLEE;
*pos++ = auth->r_capab;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_ZERO_R_CAPAB) {
wpa_printf(MSG_INFO, "DPP: TESTING - zero R-capabilities");
pos[-1] = 0;
} else if (dpp_test == DPP_TEST_INCOMPATIBLE_R_CAPAB_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - incompatible R-capabilities");
if ((auth->i_capab & DPP_CAPAB_ROLE_MASK) ==
(DPP_CAPAB_CONFIGURATOR | DPP_CAPAB_ENROLLEE))
pos[-1] = 0;
else
pos[-1] = auth->configurator ? DPP_CAPAB_ENROLLEE :
DPP_CAPAB_CONFIGURATOR;
}
skip_r_capab:
#endif /* CONFIG_TESTING_OPTIONS */
if (wrapped_r_auth) {
/* {R-auth}ke */
WPA_PUT_LE16(pos, DPP_ATTR_WRAPPED_DATA);
pos += 2;
WPA_PUT_LE16(pos, wrapped_r_auth_len);
pos += 2;
os_memcpy(pos, wrapped_r_auth, wrapped_r_auth_len);
pos += wrapped_r_auth_len;
}
/* OUI, OUI type, Crypto Suite, DPP frame type */
addr[0] = wpabuf_head_u8(msg) + 2;
len[0] = 3 + 1 + 1 + 1;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
/* Attributes before Wrapped Data */
addr[1] = attr_start;
len[1] = attr_end - attr_start;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
siv_len = pos - clear;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", clear, siv_len);
if (aes_siv_encrypt(siv_key, auth->curve->hash_len, clear, siv_len,
2, addr, len, wrapped_data) < 0) {
wpabuf_free(msg);
return NULL;
}
siv_len += AES_BLOCK_SIZE;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, siv_len);
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, siv_len);
wpabuf_put_data(msg, wrapped_data, siv_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump_buf(MSG_DEBUG,
"DPP: Authentication Response frame attributes", msg);
return msg;
}
struct wpabuf * dpp_build_peer_disc_req(struct dpp_authentication *auth, struct dpp_config_obj *conf)
{
struct wpabuf *msg;
size_t len;
struct os_time now;
if (!conf || !conf->connector || !auth || !auth->net_access_key || !conf->c_sign_key) {
wpa_printf(MSG_ERROR, "missing %s", !conf->connector ? "Connector" : !auth->net_access_key ? "netAccessKey" : "C-sign-key");
return NULL;
}
os_get_time(&now);
if (auth->net_access_key_expiry &&
(os_time_t) auth->net_access_key_expiry < now.sec) {
wpa_printf(MSG_ERROR, "netAccessKey expired");
return NULL;
}
wpa_printf(MSG_DEBUG,
"DPP: Starting network introduction protocol to derive PMKSA for "
MACSTR, MAC2STR(auth->peer_mac_addr));
len = TRANSACTION_ID_ATTR_SET_LEN + CONNECTOR_ATTR_SET_LEN + os_strlen(conf->connector);
msg = dpp_alloc_msg(DPP_PA_PEER_DISCOVERY_REQ, len);
if (!msg) {
return NULL;
}
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_TRANSACTION_ID_PEER_DISC_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Transaction ID");
goto skip_trans_id;
}
if (dpp_test == DPP_TEST_INVALID_TRANSACTION_ID_PEER_DISC_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Transaction ID");
wpabuf_put_le16(msg, DPP_ATTR_TRANSACTION_ID);
wpabuf_put_le16(msg, 0);
goto skip_trans_id;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* Transaction ID */
wpabuf_put_le16(msg, DPP_ATTR_TRANSACTION_ID);
wpabuf_put_le16(msg, 1);
wpabuf_put_u8(msg, TRANSACTION_ID);
#ifdef CONFIG_TESTING_OPTIONS
skip_trans_id:
if (dpp_test == DPP_TEST_NO_CONNECTOR_PEER_DISC_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Connector");
goto skip_connector;
}
if (dpp_test == DPP_TEST_INVALID_CONNECTOR_PEER_DISC_REQ) {
char *connector;
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Connector");
connector = dpp_corrupt_connector_signature( conf->connector);
if (!connector) {
wpabuf_free(msg);
return NULL;
}
wpabuf_put_le16(msg, DPP_ATTR_CONNECTOR);
wpabuf_put_le16(msg, os_strlen(connector));
wpabuf_put_str(msg, connector);
os_free(connector);
goto skip_connector;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* DPP Connector */
wpabuf_put_le16(msg, DPP_ATTR_CONNECTOR);
wpabuf_put_le16(msg, os_strlen(conf->connector));
wpabuf_put_str(msg, conf->connector);
#ifdef CONFIG_TESTING_OPTIONS
skip_connector:
#endif /* CONFIG_TESTING_OPTIONS */
return msg;
}
static int dpp_channel_ok_init(struct hostapd_hw_modes *own_modes,
u16 num_modes, unsigned int freq)
{
#ifndef ESP_SUPPLICANT
u16 m;
int c, flag;
if (!own_modes || !num_modes)
return 1;
for (m = 0; m < num_modes; m++) {
for (c = 0; c < own_modes[m].num_channels; c++) {
if ((unsigned int) own_modes[m].channels[c].freq !=
freq)
continue;
flag = own_modes[m].channels[c].flag;
if (!(flag & (HOSTAPD_CHAN_DISABLED |
HOSTAPD_CHAN_NO_IR |
HOSTAPD_CHAN_RADAR)))
return 1;
}
}
wpa_printf(MSG_DEBUG, "DPP: Peer channel %u MHz not supported", freq);
return 0;
#endif
return 1;
}
static int freq_included(const unsigned int freqs[], unsigned int num,
unsigned int freq)
{
while (num > 0) {
if (freqs[--num] == freq)
return 1;
}
return 0;
}
static void freq_to_start(unsigned int freqs[], unsigned int num,
unsigned int freq)
{
unsigned int i;
for (i = 0; i < num; i++) {
if (freqs[i] == freq)
break;
}
if (i == 0 || i >= num)
return;
os_memmove(&freqs[1], &freqs[0], i * sizeof(freqs[0]));
freqs[0] = freq;
}
static int dpp_channel_intersect(struct dpp_authentication *auth,
struct hostapd_hw_modes *own_modes,
u16 num_modes)
{
struct dpp_bootstrap_info *peer_bi = auth->peer_bi;
unsigned int i, freq;
for (i = 0; i < peer_bi->num_freq; i++) {
freq = peer_bi->freq[i];
if (freq_included(auth->freq, auth->num_freq, freq))
continue;
if (dpp_channel_ok_init(own_modes, num_modes, freq))
auth->freq[auth->num_freq++] = freq;
}
if (!auth->num_freq) {
wpa_printf(MSG_INFO,
"DPP: No available channels for initiating DPP Authentication");
return -1;
}
auth->curr_freq = auth->freq[0];
return 0;
}
static int dpp_channel_local_list(struct dpp_authentication *auth,
struct hostapd_hw_modes *own_modes,
u16 num_modes)
{
#ifndef ESP_SUPPLICANT
u16 m;
int c, flag;
unsigned int freq;
if (!own_modes || !num_modes) {
auth->freq[0] = 2412;
auth->freq[1] = 2437;
auth->freq[2] = 2462;
auth->num_freq = 3;
return 0;
}
for (m = 0; m < num_modes; m++) {
for (c = 0; c < own_modes[m].num_channels; c++) {
freq = own_modes[m].channels[c].freq;
flag = own_modes[m].channels[c].flag;
if (flag & (HOSTAPD_CHAN_DISABLED |
HOSTAPD_CHAN_NO_IR |
HOSTAPD_CHAN_RADAR))
continue;
if (freq_included(auth->freq, auth->num_freq, freq))
continue;
auth->freq[auth->num_freq++] = freq;
if (auth->num_freq == DPP_BOOTSTRAP_MAX_FREQ) {
m = num_modes;
break;
}
}
}
#else
auth->freq[0] = 2412;
auth->freq[1] = 2437;
auth->freq[2] = 2462;
auth->num_freq = 3;
#endif
return auth->num_freq == 0 ? -1 : 0;
}
static int dpp_prepare_channel_list(struct dpp_authentication *auth,
struct hostapd_hw_modes *own_modes,
u16 num_modes)
{
int res;
char freqs[DPP_BOOTSTRAP_MAX_FREQ * 6 + 10], *pos, *end;
unsigned int i;
if (auth->peer_bi->num_freq > 0)
res = dpp_channel_intersect(auth, own_modes, num_modes);
else
res = dpp_channel_local_list(auth, own_modes, num_modes);
if (res < 0)
return res;
/* Prioritize 2.4 GHz channels 6, 1, 11 (in this order) to hit the most
* likely channels first. */
freq_to_start(auth->freq, auth->num_freq, 2462);
freq_to_start(auth->freq, auth->num_freq, 2412);
freq_to_start(auth->freq, auth->num_freq, 2437);
auth->freq_idx = 0;
auth->curr_freq = auth->freq[0];
pos = freqs;
end = pos + sizeof(freqs);
for (i = 0; i < auth->num_freq; i++) {
res = os_snprintf(pos, end - pos, " %u", auth->freq[i]);
if (os_snprintf_error(end - pos, res))
break;
pos += res;
}
*pos = '\0';
wpa_printf(MSG_DEBUG, "DPP: Possible frequencies for initiating:%s",
freqs);
return 0;
}
int dpp_gen_uri(struct dpp_bootstrap_info *bi)
{
char macstr[ETH_ALEN * 2 + 10];
size_t len;
len = 4; /* "DPP:" */
if (bi->chan)
len += 3 + os_strlen(bi->chan); /* C:...; */
if (is_zero_ether_addr(bi->mac_addr))
macstr[0] = '\0';
else
os_snprintf(macstr, sizeof(macstr), "M:" MACSTR ";", MAC2STR(bi->mac_addr));
len += os_strlen(macstr); /* M:...; */
if (bi->info)
len += 3 + os_strlen(bi->info); /* I:...; */
len += 4 + os_strlen(bi->pk); /* K:...;; */
os_free(bi->uri);
bi->uri = os_malloc(len + 1);
if (!bi->uri)
return -1;
os_snprintf(bi->uri, len + 1, "DPP:%s%s%s%s%s%s%sK:%s;;",
bi->chan ? "C:" : "", bi->chan ? bi->chan : "",
bi->chan ? ";" : "",
macstr,
bi->info ? "I:" : "", bi->info ? bi->info : "",
bi->info ? ";" : "",
bi->pk);
return 0;
}
static int dpp_autogen_bootstrap_key(struct dpp_authentication *auth)
{
struct dpp_bootstrap_info *bi;
if (auth->own_bi)
return 0; /* already generated */
bi = os_zalloc(sizeof(*bi));
if (!bi)
return -1;
bi->type = DPP_BOOTSTRAP_QR_CODE;
if (dpp_keygen(bi, auth->peer_bi->curve->name, NULL, 0) < 0 ||
dpp_gen_uri(bi) < 0)
goto fail;
wpa_printf(MSG_DEBUG,
"DPP: Auto-generated own bootstrapping key info: URI %s",
bi->uri);
auth->tmp_own_bi = auth->own_bi = bi;
return 0;
fail:
dpp_bootstrap_info_free(bi);
return -1;
}
struct dpp_authentication * dpp_auth_init(void *msg_ctx,
struct dpp_bootstrap_info *peer_bi,
struct dpp_bootstrap_info *own_bi,
u8 dpp_allowed_roles,
unsigned int neg_freq,
struct hostapd_hw_modes *own_modes,
u16 num_modes)
{
struct dpp_authentication *auth;
size_t nonce_len;
size_t secret_len;
struct wpabuf *pi = NULL;
const u8 *r_pubkey_hash, *i_pubkey_hash;
#ifdef CONFIG_TESTING_OPTIONS
u8 test_hash[SHA256_MAC_LEN];
#endif /* CONFIG_TESTING_OPTIONS */
auth = os_zalloc(sizeof(*auth));
if (!auth)
return NULL;
auth->msg_ctx = msg_ctx;
auth->initiator = 1;
auth->waiting_auth_resp = 1;
auth->allowed_roles = dpp_allowed_roles;
auth->configurator = !!(dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR);
auth->peer_bi = peer_bi;
auth->own_bi = own_bi;
auth->curve = peer_bi->curve;
if (dpp_autogen_bootstrap_key(auth) < 0 ||
dpp_prepare_channel_list(auth, own_modes, num_modes) < 0)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_nonce_override_len > 0) {
wpa_printf(MSG_INFO, "DPP: TESTING - override I-nonce");
nonce_len = dpp_nonce_override_len;
os_memcpy(auth->i_nonce, dpp_nonce_override, nonce_len);
} else {
nonce_len = auth->curve->nonce_len;
if (random_get_bytes(auth->i_nonce, nonce_len)) {
wpa_printf(MSG_ERROR,
"DPP: Failed to generate I-nonce");
goto fail;
}
}
#else /* CONFIG_TESTING_OPTIONS */
nonce_len = auth->curve->nonce_len;
if (random_get_bytes(auth->i_nonce, nonce_len)) {
wpa_printf(MSG_ERROR, "DPP: Failed to generate I-nonce");
goto fail;
}
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", auth->i_nonce, nonce_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_protocol_key_override_len) {
const struct dpp_curve_params *tmp_curve;
wpa_printf(MSG_INFO,
"DPP: TESTING - override protocol key");
auth->own_protocol_key = dpp_set_keypair(
&tmp_curve, dpp_protocol_key_override,
dpp_protocol_key_override_len);
} else {
auth->own_protocol_key = dpp_gen_keypair(auth->curve);
}
#else /* CONFIG_TESTING_OPTIONS */
auth->own_protocol_key = dpp_gen_keypair(auth->curve);
#endif /* CONFIG_TESTING_OPTIONS */
if (!auth->own_protocol_key)
goto fail;
pi = dpp_get_pubkey_point(auth->own_protocol_key, 0);
if (!pi)
goto fail;
/* ECDH: M = pI * BR */
if (dpp_ecdh(auth->own_protocol_key, auth->peer_bi->pubkey,
auth->Mx, &secret_len) < 0)
goto fail;
auth->secret_len = secret_len;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (M.x)",
auth->Mx, auth->secret_len);
auth->Mx_len = auth->secret_len;
if (dpp_derive_k1(auth->Mx, auth->secret_len, auth->k1,
auth->curve->hash_len) < 0)
goto fail;
r_pubkey_hash = auth->peer_bi->pubkey_hash;
i_pubkey_hash = auth->own_bi->pubkey_hash;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
r_pubkey_hash = NULL;
} else if (dpp_test == DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid R-Bootstrap Key Hash");
os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
r_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
i_pubkey_hash = NULL;
} else if (dpp_test == DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid I-Bootstrap Key Hash");
os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
i_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_I_PROTO_KEY_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Proto Key");
wpabuf_free(pi);
pi = NULL;
} else if (dpp_test == DPP_TEST_INVALID_I_PROTO_KEY_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid I-Proto Key");
wpabuf_free(pi);
pi = wpabuf_alloc(2 * auth->curve->prime_len);
if (!pi || dpp_test_gen_invalid_key(pi, auth->curve) < 0)
goto fail;
}
#endif /* CONFIG_TESTING_OPTIONS */
auth->req_msg = dpp_auth_build_req(auth, pi, nonce_len, r_pubkey_hash,
i_pubkey_hash, neg_freq);
if (!auth->req_msg)
goto fail;
out:
wpabuf_free(pi);
return auth;
fail:
dpp_auth_deinit(auth);
auth = NULL;
goto out;
}
static struct wpabuf * dpp_build_conf_req_attr(struct dpp_authentication *auth,
const char *json)
{
size_t nonce_len;
size_t json_len, clear_len;
struct wpabuf *clear = NULL, *msg = NULL;
u8 *wrapped;
size_t attr_len;
wpa_printf(MSG_DEBUG, "DPP: Build configuration request");
nonce_len = auth->curve->nonce_len;
if (random_get_bytes(auth->e_nonce, nonce_len)) {
wpa_printf(MSG_ERROR, "DPP: Failed to generate E-nonce");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: E-nonce", auth->e_nonce, nonce_len);
json_len = os_strlen(json);
wpa_hexdump_ascii(MSG_DEBUG, "DPP: configRequest JSON", (u8 *)json, json_len);
/* { E-nonce, configAttrib }ke */
clear_len = 4 + nonce_len + 4 + json_len;
clear = wpabuf_alloc(clear_len);
attr_len = 4 + clear_len + AES_BLOCK_SIZE;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_REQ)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = wpabuf_alloc(attr_len);
if (!clear || !msg)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_E_NONCE_CONF_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no E-nonce");
goto skip_e_nonce;
}
if (dpp_test == DPP_TEST_INVALID_E_NONCE_CONF_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid E-nonce");
wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
wpabuf_put_le16(clear, nonce_len - 1);
wpabuf_put_data(clear, auth->e_nonce, nonce_len - 1);
goto skip_e_nonce;
}
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_CONF_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
goto skip_wrapped_data;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* E-nonce */
wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
wpabuf_put_le16(clear, nonce_len);
wpabuf_put_data(clear, auth->e_nonce, nonce_len);
#ifdef CONFIG_TESTING_OPTIONS
skip_e_nonce:
if (dpp_test == DPP_TEST_NO_CONFIG_ATTR_OBJ_CONF_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no configAttrib");
goto skip_conf_attr_obj;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* configAttrib */
wpabuf_put_le16(clear, DPP_ATTR_CONFIG_ATTR_OBJ);
wpabuf_put_le16(clear, json_len);
wpabuf_put_data(clear, json, json_len);
#ifdef CONFIG_TESTING_OPTIONS
skip_conf_attr_obj:
#endif /* CONFIG_TESTING_OPTIONS */
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
/* No AES-SIV AD */
wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
wpabuf_head(clear), wpabuf_len(clear),
0, NULL, NULL, wrapped) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump_buf(MSG_DEBUG,
"DPP: Configuration Request frame attributes", msg);
wpabuf_free(clear);
return msg;
fail:
wpabuf_free(clear);
wpabuf_free(msg);
return NULL;
}
static void dpp_write_adv_proto(struct wpabuf *buf)
{
/* Advertisement Protocol IE */
wpabuf_put_u8(buf, WLAN_EID_ADV_PROTO);
wpabuf_put_u8(buf, 8); /* Length */
wpabuf_put_u8(buf, 0x7f);
wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
wpabuf_put_u8(buf, 5);
wpabuf_put_be24(buf, OUI_WFA);
wpabuf_put_u8(buf, DPP_OUI_TYPE);
wpabuf_put_u8(buf, 0x01);
}
static void dpp_write_gas_query(struct wpabuf *buf, struct wpabuf *query)
{
/* GAS Query */
wpabuf_put_le16(buf, wpabuf_len(query));
wpabuf_put_buf(buf, query);
}
struct wpabuf * dpp_build_conf_req(struct dpp_authentication *auth,
const char *json)
{
struct wpabuf *buf, *conf_req;
conf_req = dpp_build_conf_req_attr(auth, json);
if (!conf_req) {
wpa_printf(MSG_DEBUG,
"DPP: No configuration request data available");
return NULL;
}
buf = gas_build_initial_req(0, 10 + 2 + wpabuf_len(conf_req));
if (!buf) {
wpabuf_free(conf_req);
return NULL;
}
dpp_write_adv_proto(buf);
dpp_write_gas_query(buf, conf_req);
wpabuf_free(conf_req);
wpa_hexdump_buf(MSG_MSGDUMP, "DPP: GAS Config Request", buf);
return buf;
}
struct wpabuf * dpp_build_conf_req_helper(struct dpp_authentication *auth,
const char *name,
enum dpp_netrole netrole,
const char *mud_url, int *opclasses)
{
size_t len, name_len;
const char *tech = "infra";
const char *dpp_name;
struct wpabuf *buf, *json;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_INVALID_CONFIG_ATTR_OBJ_CONF_REQ) {
static const char *bogus_tech = "knfra";
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Config Attr");
tech = bogus_tech;
}
#endif /* CONFIG_TESTING_OPTIONS */
dpp_name = name ? name : "Test";
name_len = os_strlen(dpp_name);
len = 100 + name_len * 6 + 1 + int_array_len(opclasses) * 4;
if (mud_url && mud_url[0])
len += 10 + os_strlen(mud_url);
json = wpabuf_alloc(len);
if (!json)
return NULL;
json_start_object(json, NULL);
if (json_add_string_escape(json, "name", dpp_name, name_len) < 0) {
wpabuf_free(json);
return NULL;
}
json_value_sep(json);
json_add_string(json, "wi-fi_tech", tech);
json_value_sep(json);
json_add_string(json, "netRole", dpp_netrole_str(netrole));
if (mud_url && mud_url[0]) {
json_value_sep(json);
json_add_string(json, "mudurl", mud_url);
}
if (opclasses) {
int i;
json_value_sep(json);
json_start_array(json, "bandSupport");
for (i = 0; opclasses[i]; i++)
wpabuf_printf(json, "%s%u", i ? "," : "", opclasses[i]);
json_end_array(json);
}
json_end_object(json);
buf = dpp_build_conf_req(auth, wpabuf_head(json));
wpabuf_free(json);
return buf;
}
static void dpp_auth_success(struct dpp_authentication *auth)
{
wpa_printf(MSG_DEBUG,
"DPP: Authentication success - clear temporary keys");
os_memset(auth->Mx, 0, sizeof(auth->Mx));
auth->Mx_len = 0;
os_memset(auth->Nx, 0, sizeof(auth->Nx));
auth->Nx_len = 0;
os_memset(auth->Lx, 0, sizeof(auth->Lx));
auth->Lx_len = 0;
os_memset(auth->k1, 0, sizeof(auth->k1));
os_memset(auth->k2, 0, sizeof(auth->k2));
auth->auth_success = 1;
}
static int dpp_auth_build_resp_ok(struct dpp_authentication *auth)
{
size_t nonce_len;
size_t secret_len;
struct wpabuf *msg, *pr = NULL;
u8 r_auth[4 + DPP_MAX_HASH_LEN];
u8 wrapped_r_auth[4 + DPP_MAX_HASH_LEN + AES_BLOCK_SIZE], *w_r_auth;
size_t wrapped_r_auth_len;
int ret = -1;
const u8 *r_pubkey_hash, *i_pubkey_hash, *r_nonce, *i_nonce;
enum dpp_status_error status = DPP_STATUS_OK;
#ifdef CONFIG_TESTING_OPTIONS
u8 test_hash[SHA256_MAC_LEN];
#endif /* CONFIG_TESTING_OPTIONS */
wpa_printf(MSG_DEBUG, "DPP: Build Authentication Response");
if (!auth->own_bi)
return -1;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_nonce_override_len > 0) {
wpa_printf(MSG_INFO, "DPP: TESTING - override R-nonce");
nonce_len = dpp_nonce_override_len;
os_memcpy(auth->r_nonce, dpp_nonce_override, nonce_len);
} else {
nonce_len = auth->curve->nonce_len;
if (random_get_bytes(auth->r_nonce, nonce_len)) {
wpa_printf(MSG_ERROR,
"DPP: Failed to generate R-nonce");
goto fail;
}
}
#else /* CONFIG_TESTING_OPTIONS */
nonce_len = auth->curve->nonce_len;
if (random_get_bytes(auth->r_nonce, nonce_len)) {
wpa_printf(MSG_ERROR, "DPP: Failed to generate R-nonce");
goto fail;
}
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump(MSG_DEBUG, "DPP: R-nonce", auth->r_nonce, nonce_len);
crypto_ec_key_deinit(auth->own_protocol_key);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_protocol_key_override_len) {
const struct dpp_curve_params *tmp_curve;
wpa_printf(MSG_INFO,
"DPP: TESTING - override protocol key");
auth->own_protocol_key = dpp_set_keypair(
&tmp_curve, dpp_protocol_key_override,
dpp_protocol_key_override_len);
} else {
auth->own_protocol_key = dpp_gen_keypair(auth->curve);
}
#else /* CONFIG_TESTING_OPTIONS */
auth->own_protocol_key = dpp_gen_keypair(auth->curve);
#endif /* CONFIG_TESTING_OPTIONS */
if (!auth->own_protocol_key)
goto fail;
pr = dpp_get_pubkey_point(auth->own_protocol_key, 0);
if (!pr)
goto fail;
/* ECDH: N = pR * PI */
if (dpp_ecdh(auth->own_protocol_key, auth->peer_protocol_key,
auth->Nx, &secret_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)",
auth->Nx, auth->secret_len);
auth->Nx_len = auth->secret_len;
if (dpp_derive_k2(auth->Nx, auth->secret_len, auth->k2,
auth->curve->hash_len) < 0)
goto fail;
if (auth->own_bi && auth->peer_bi) {
/* Mutual authentication */
if (dpp_auth_derive_l_responder(auth) < 0)
goto fail;
}
if (dpp_derive_bk_ke(auth) < 0)
goto fail;
/* R-auth = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */
WPA_PUT_LE16(r_auth, DPP_ATTR_R_AUTH_TAG);
WPA_PUT_LE16(&r_auth[2], auth->curve->hash_len);
if (dpp_gen_r_auth(auth, r_auth + 4) < 0)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_R_AUTH_MISMATCH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - R-auth mismatch");
r_auth[4 + auth->curve->hash_len / 2] ^= 0x01;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
r_auth, 4 + auth->curve->hash_len,
0, NULL, NULL, wrapped_r_auth) < 0)
goto fail;
wrapped_r_auth_len = 4 + auth->curve->hash_len + AES_BLOCK_SIZE;
wpa_hexdump(MSG_DEBUG, "DPP: {R-auth}ke",
wrapped_r_auth, wrapped_r_auth_len);
w_r_auth = wrapped_r_auth;
r_pubkey_hash = auth->own_bi->pubkey_hash;
if (auth->peer_bi)
i_pubkey_hash = auth->peer_bi->pubkey_hash;
else
i_pubkey_hash = NULL;
i_nonce = auth->i_nonce;
r_nonce = auth->r_nonce;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
r_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid R-Bootstrap Key Hash");
os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
r_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
i_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid I-Bootstrap Key Hash");
if (i_pubkey_hash)
os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
else
os_memset(test_hash, 0, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
i_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_R_PROTO_KEY_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Proto Key");
wpabuf_free(pr);
pr = NULL;
} else if (dpp_test == DPP_TEST_INVALID_R_PROTO_KEY_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid R-Proto Key");
wpabuf_free(pr);
pr = wpabuf_alloc(2 * auth->curve->prime_len);
if (!pr || dpp_test_gen_invalid_key(pr, auth->curve) < 0)
goto fail;
} else if (dpp_test == DPP_TEST_NO_R_AUTH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Auth");
w_r_auth = NULL;
wrapped_r_auth_len = 0;
} else if (dpp_test == DPP_TEST_NO_STATUS_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
status = 255;
} else if (dpp_test == DPP_TEST_INVALID_STATUS_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
status = 254;
} else if (dpp_test == DPP_TEST_NO_R_NONCE_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-nonce");
r_nonce = NULL;
} else if (dpp_test == DPP_TEST_NO_I_NONCE_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-nonce");
i_nonce = NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_auth_build_resp(auth, status, pr, nonce_len,
r_pubkey_hash, i_pubkey_hash,
r_nonce, i_nonce,
w_r_auth, wrapped_r_auth_len,
auth->k2);
if (!msg)
goto fail;
wpabuf_free(auth->resp_msg);
auth->resp_msg = msg;
ret = 0;
fail:
wpabuf_free(pr);
return ret;
}
static int dpp_auth_build_resp_status(struct dpp_authentication *auth,
enum dpp_status_error status)
{
struct wpabuf *msg;
const u8 *r_pubkey_hash, *i_pubkey_hash, *i_nonce;
#ifdef CONFIG_TESTING_OPTIONS
u8 test_hash[SHA256_MAC_LEN];
#endif /* CONFIG_TESTING_OPTIONS */
if (!auth->own_bi)
return -1;
wpa_printf(MSG_DEBUG, "DPP: Build Authentication Response");
r_pubkey_hash = auth->own_bi->pubkey_hash;
if (auth->peer_bi)
i_pubkey_hash = auth->peer_bi->pubkey_hash;
else
i_pubkey_hash = NULL;
i_nonce = auth->i_nonce;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
r_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid R-Bootstrap Key Hash");
os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
r_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
i_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid I-Bootstrap Key Hash");
if (i_pubkey_hash)
os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
else
os_memset(test_hash, 0, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
i_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_STATUS_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
status = 255;
} else if (dpp_test == DPP_TEST_NO_I_NONCE_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-nonce");
i_nonce = NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_auth_build_resp(auth, status, NULL, auth->curve->nonce_len,
r_pubkey_hash, i_pubkey_hash,
NULL, i_nonce, NULL, 0, auth->k1);
if (!msg)
return -1;
wpabuf_free(auth->resp_msg);
auth->resp_msg = msg;
return 0;
}
struct dpp_authentication *
dpp_auth_req_rx(void *msg_ctx, u8 dpp_allowed_roles, int qr_mutual,
struct dpp_bootstrap_info *peer_bi,
struct dpp_bootstrap_info *own_bi,
unsigned int curr_chan, const u8 *hdr, const u8 *attr_start,
size_t attr_len)
{
struct crypto_ec_key *pi = NULL;
size_t secret_len;
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
const u8 *wrapped_data;
const u8 *i_proto;
const u8 *i_nonce;
const u8 *i_capab;
const u8 *i_bootstrap;
u16 wrapped_data_len;
u16 i_proto_len;
u16 i_nonce_len;
u16 i_capab_len;
u16 i_bootstrap_len;
struct dpp_authentication *auth = NULL;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_AUTH_REQ) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at Authentication Request");
return NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
"Missing or invalid required Wrapped Data attribute");
return NULL;
}
wpa_hexdump(MSG_MSGDUMP, "DPP: Wrapped Data",
wrapped_data, wrapped_data_len);
attr_len = wrapped_data - 4 - attr_start;
auth = os_zalloc(sizeof(*auth));
if (!auth)
goto fail;
auth->msg_ctx = msg_ctx;
auth->peer_bi = peer_bi;
auth->own_bi = own_bi;
auth->curve = own_bi->curve;
auth->curr_chan = curr_chan;
auth->peer_version = 1; /* default to the first version */
#if 0
channel = dpp_get_attr(attr_start, attr_len, DPP_ATTR_CHANNEL,
&channel_len);
if (channel) {
//int neg_freq;
if (channel_len < 2) {
dpp_auth_fail(auth, "Too short Channel attribute");
goto fail;
}
neg_freq = ieee80211_chan_to_freq(NULL, channel[0], channel[1]);
wpa_printf(MSG_DEBUG,
"DPP: Initiator requested different channel for negotiation: op_class=%u channel=%u --> freq=%d",
channel[0], channel[1], neg_freq);
if (neg_freq < 0) {
dpp_auth_fail(auth,
"Unsupported Channel attribute value");
goto fail;
}
if (auth->curr_freq != (unsigned int) neg_freq) {
wpa_printf(MSG_DEBUG,
"DPP: Changing negotiation channel from %u MHz to %u MHz",
freq, neg_freq);
auth->curr_freq = neg_freq;
}
/* rename it to chan */
auth->curr_chan = *channel;
}
#endif
i_proto = dpp_get_attr(attr_start, attr_len, DPP_ATTR_I_PROTOCOL_KEY,
&i_proto_len);
if (!i_proto) {
dpp_auth_fail(auth,
"Missing required Initiator Protocol Key attribute");
goto fail;
}
wpa_hexdump(MSG_MSGDUMP, "DPP: Initiator Protocol Key",
i_proto, i_proto_len);
/* M = bR * PI */
pi = dpp_set_pubkey_point(own_bi->pubkey, i_proto, i_proto_len);
if (!pi) {
dpp_auth_fail(auth, "Invalid Initiator Protocol Key");
goto fail;
}
dpp_debug_print_key("Peer (Initiator) Protocol Key", pi);
if (dpp_ecdh(own_bi->pubkey, pi, auth->Mx, &secret_len) < 0)
goto fail;
auth->secret_len = secret_len;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (M.x)",
auth->Mx, auth->secret_len);
auth->Mx_len = auth->secret_len;
if (dpp_derive_k1(auth->Mx, auth->secret_len, auth->k1,
auth->curve->hash_len) < 0)
goto fail;
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
goto fail;
if (aes_siv_decrypt(auth->k1, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE,
&i_nonce_len);
if (!i_nonce || i_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth, "Missing or invalid I-nonce");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len);
os_memcpy(auth->i_nonce, i_nonce, i_nonce_len);
i_capab = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_I_CAPABILITIES,
&i_capab_len);
if (!i_capab || i_capab_len < 1) {
dpp_auth_fail(auth, "Missing or invalid I-capabilities");
goto fail;
}
auth->i_capab = i_capab[0];
wpa_printf(MSG_DEBUG, "DPP: I-capabilities: 0x%02x", auth->i_capab);
bin_clear_free(unwrapped, unwrapped_len);
unwrapped = NULL;
switch (auth->i_capab & DPP_CAPAB_ROLE_MASK) {
case DPP_CAPAB_ENROLLEE:
if (!(dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR)) {
wpa_printf(MSG_DEBUG,
"DPP: Local policy does not allow Configurator role");
goto not_compatible;
}
wpa_printf(MSG_DEBUG, "DPP: Acting as Configurator");
auth->configurator = 1;
break;
case DPP_CAPAB_CONFIGURATOR:
if (!(dpp_allowed_roles & DPP_CAPAB_ENROLLEE)) {
wpa_printf(MSG_DEBUG,
"DPP: Local policy does not allow Enrollee role");
goto not_compatible;
}
wpa_printf(MSG_DEBUG, "DPP: Acting as Enrollee");
auth->configurator = 0;
break;
case DPP_CAPAB_CONFIGURATOR | DPP_CAPAB_ENROLLEE:
if (dpp_allowed_roles & DPP_CAPAB_ENROLLEE) {
wpa_printf(MSG_DEBUG, "DPP: Acting as Enrollee");
auth->configurator = 0;
} else if (dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR) {
wpa_printf(MSG_DEBUG, "DPP: Acting as Configurator");
auth->configurator = 1;
} else {
wpa_printf(MSG_DEBUG,
"DPP: Local policy does not allow Configurator/Enrollee role");
goto not_compatible;
}
break;
default:
wpa_printf(MSG_DEBUG, "DPP: Unexpected role in I-capabilities");
goto fail;
}
auth->peer_protocol_key = pi;
pi = NULL;
if (qr_mutual && !peer_bi && own_bi->type == DPP_BOOTSTRAP_QR_CODE) {
char hex[SHA256_MAC_LEN * 2 + 1];
wpa_printf(MSG_DEBUG,
"DPP: Mutual authentication required with QR Codes, but peer info is not yet available - request more time");
if (dpp_auth_build_resp_status(auth,
DPP_STATUS_RESPONSE_PENDING) < 0)
goto fail;
i_bootstrap = dpp_get_attr(attr_start, attr_len,
DPP_ATTR_I_BOOTSTRAP_KEY_HASH,
&i_bootstrap_len);
if (i_bootstrap && i_bootstrap_len == SHA256_MAC_LEN) {
auth->response_pending = 1;
os_memcpy(auth->waiting_pubkey_hash,
i_bootstrap, i_bootstrap_len);
wpa_snprintf_hex(hex, sizeof(hex), i_bootstrap,
i_bootstrap_len);
} else {
hex[0] = '\0';
}
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_SCAN_PEER_QR_CODE
"%s", hex);
return auth;
}
if (dpp_auth_build_resp_ok(auth) < 0)
goto fail;
return auth;
not_compatible:
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_NOT_COMPATIBLE
"i-capab=0x%02x", auth->i_capab);
if (dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR)
auth->configurator = 1;
else
auth->configurator = 0;
auth->peer_protocol_key = pi;
pi = NULL;
if (dpp_auth_build_resp_status(auth, DPP_STATUS_NOT_COMPATIBLE) < 0)
goto fail;
auth->remove_on_tx_status = 1;
return auth;
fail:
bin_clear_free(unwrapped, unwrapped_len);
crypto_ec_key_deinit(pi);
dpp_auth_deinit(auth);
return NULL;
}
int dpp_notify_new_qr_code(struct dpp_authentication *auth,
struct dpp_bootstrap_info *peer_bi)
{
if (!auth || !auth->response_pending ||
os_memcmp(auth->waiting_pubkey_hash, peer_bi->pubkey_hash,
SHA256_MAC_LEN) != 0)
return 0;
wpa_printf(MSG_DEBUG,
"DPP: New scanned QR Code has matching public key that was needed to continue DPP Authentication exchange with "
MACSTR, MAC2STR(auth->peer_mac_addr));
auth->peer_bi = peer_bi;
if (dpp_auth_build_resp_ok(auth) < 0)
return -1;
return 1;
}
static struct wpabuf * dpp_auth_build_conf(struct dpp_authentication *auth,
enum dpp_status_error status)
{
struct wpabuf *msg;
u8 i_auth[4 + DPP_MAX_HASH_LEN];
size_t i_auth_len;
u8 r_nonce[4 + DPP_MAX_NONCE_LEN];
size_t r_nonce_len;
const u8 *addr[2];
size_t len[2], attr_len;
u8 *wrapped_i_auth;
u8 *wrapped_r_nonce;
u8 *attr_start, *attr_end;
const u8 *r_pubkey_hash, *i_pubkey_hash;
#ifdef CONFIG_TESTING_OPTIONS
u8 test_hash[SHA256_MAC_LEN];
#endif /* CONFIG_TESTING_OPTIONS */
wpa_printf(MSG_DEBUG, "DPP: Build Authentication Confirmation");
i_auth_len = 4 + auth->curve->hash_len;
r_nonce_len = 4 + auth->curve->nonce_len;
/* Build DPP Authentication Confirmation frame attributes */
attr_len = 4 + 1 + 2 * (4 + SHA256_MAC_LEN) +
4 + i_auth_len + r_nonce_len + AES_BLOCK_SIZE;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_CONF)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_alloc_msg(DPP_PA_AUTHENTICATION_CONF, attr_len);
if (!msg)
goto fail;
attr_start = wpabuf_put(msg, 0);
r_pubkey_hash = auth->peer_bi->pubkey_hash;
if (auth->own_bi)
i_pubkey_hash = auth->own_bi->pubkey_hash;
else
i_pubkey_hash = NULL;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_STATUS_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
goto skip_status;
} else if (dpp_test == DPP_TEST_INVALID_STATUS_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
status = 254;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* DPP Status */
dpp_build_attr_status(msg, status);
#ifdef CONFIG_TESTING_OPTIONS
skip_status:
if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
r_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid R-Bootstrap Key Hash");
os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
r_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
i_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid I-Bootstrap Key Hash");
if (i_pubkey_hash)
os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
else
os_memset(test_hash, 0, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
i_pubkey_hash = test_hash;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* Responder Bootstrapping Key Hash */
dpp_build_attr_r_bootstrap_key_hash(msg, r_pubkey_hash);
/* Initiator Bootstrapping Key Hash (mutual authentication) */
dpp_build_attr_i_bootstrap_key_hash(msg, i_pubkey_hash);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_AUTH_CONF)
goto skip_wrapped_data;
if (dpp_test == DPP_TEST_NO_I_AUTH_AUTH_CONF)
i_auth_len = 0;
#endif /* CONFIG_TESTING_OPTIONS */
attr_end = wpabuf_put(msg, 0);
/* OUI, OUI type, Crypto Suite, DPP frame type */
addr[0] = wpabuf_head_u8(msg) + 2;
len[0] = 3 + 1 + 1 + 1;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
/* Attributes before Wrapped Data */
addr[1] = attr_start;
len[1] = attr_end - attr_start;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
if (status == DPP_STATUS_OK) {
/* I-auth wrapped with ke */
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, i_auth_len + AES_BLOCK_SIZE);
wrapped_i_auth = wpabuf_put(msg, i_auth_len + AES_BLOCK_SIZE);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_I_AUTH_AUTH_CONF)
goto skip_i_auth;
#endif /* CONFIG_TESTING_OPTIONS */
/* I-auth = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |]
* 1) */
WPA_PUT_LE16(i_auth, DPP_ATTR_I_AUTH_TAG);
WPA_PUT_LE16(&i_auth[2], auth->curve->hash_len);
if (dpp_gen_i_auth(auth, i_auth + 4) < 0)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_I_AUTH_MISMATCH_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - I-auth mismatch");
i_auth[4 + auth->curve->hash_len / 2] ^= 0x01;
}
skip_i_auth:
#endif /* CONFIG_TESTING_OPTIONS */
if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
i_auth, i_auth_len,
2, addr, len, wrapped_i_auth) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: {I-auth}ke",
wrapped_i_auth, i_auth_len + AES_BLOCK_SIZE);
} else {
/* R-nonce wrapped with k2 */
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, r_nonce_len + AES_BLOCK_SIZE);
wrapped_r_nonce = wpabuf_put(msg, r_nonce_len + AES_BLOCK_SIZE);
WPA_PUT_LE16(r_nonce, DPP_ATTR_R_NONCE);
WPA_PUT_LE16(&r_nonce[2], auth->curve->nonce_len);
os_memcpy(r_nonce + 4, auth->r_nonce, auth->curve->nonce_len);
if (aes_siv_encrypt(auth->k2, auth->curve->hash_len,
r_nonce, r_nonce_len,
2, addr, len, wrapped_r_nonce) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: {R-nonce}k2",
wrapped_r_nonce, r_nonce_len + AES_BLOCK_SIZE);
}
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump_buf(MSG_DEBUG,
"DPP: Authentication Confirmation frame attributes",
msg);
if (status == DPP_STATUS_OK)
dpp_auth_success(auth);
return msg;
fail:
wpabuf_free(msg);
return NULL;
}
static void
dpp_auth_resp_rx_status(struct dpp_authentication *auth, const u8 *hdr,
const u8 *attr_start, size_t attr_len,
const u8 *wrapped_data, u16 wrapped_data_len,
enum dpp_status_error status)
{
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
const u8 *i_nonce, *r_capab;
u16 i_nonce_len, r_capab_len;
if (status == DPP_STATUS_NOT_COMPATIBLE) {
wpa_printf(MSG_DEBUG,
"DPP: Responder reported incompatible roles");
} else if (status == DPP_STATUS_RESPONSE_PENDING) {
wpa_printf(MSG_DEBUG,
"DPP: Responder reported more time needed");
} else {
wpa_printf(MSG_DEBUG,
"DPP: Responder reported failure (status %d)",
status);
dpp_auth_fail(auth, "Responder reported failure");
return;
}
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
goto fail;
if (aes_siv_decrypt(auth->k1, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE,
&i_nonce_len);
if (!i_nonce || i_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth, "Missing or invalid I-nonce");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len);
if (os_memcmp(auth->i_nonce, i_nonce, i_nonce_len) != 0) {
dpp_auth_fail(auth, "I-nonce mismatch");
goto fail;
}
r_capab = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_R_CAPABILITIES,
&r_capab_len);
if (!r_capab || r_capab_len < 1) {
dpp_auth_fail(auth, "Missing or invalid R-capabilities");
goto fail;
}
auth->r_capab = r_capab[0];
wpa_printf(MSG_DEBUG, "DPP: R-capabilities: 0x%02x", auth->r_capab);
if (status == DPP_STATUS_NOT_COMPATIBLE) {
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_NOT_COMPATIBLE
"r-capab=0x%02x", auth->r_capab);
} else if (status == DPP_STATUS_RESPONSE_PENDING) {
u8 role = auth->r_capab & DPP_CAPAB_ROLE_MASK;
if ((auth->configurator && role != DPP_CAPAB_ENROLLEE) ||
(!auth->configurator && role != DPP_CAPAB_CONFIGURATOR)) {
wpa_msg(auth->msg_ctx, MSG_INFO,
DPP_EVENT_FAIL "Unexpected role in R-capabilities 0x%02x",
role);
} else {
wpa_printf(MSG_DEBUG,
"DPP: Continue waiting for full DPP Authentication Response");
wpa_msg(auth->msg_ctx, MSG_INFO,
DPP_EVENT_RESPONSE_PENDING "%s",
auth->tmp_own_bi ? auth->tmp_own_bi->uri : "");
}
}
fail:
bin_clear_free(unwrapped, unwrapped_len);
}
struct wpabuf *
dpp_auth_resp_rx(struct dpp_authentication *auth, const u8 *hdr,
const u8 *attr_start, size_t attr_len)
{
struct crypto_ec_key *pr;
size_t secret_len;
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL, *unwrapped2 = NULL;
size_t unwrapped_len = 0, unwrapped2_len = 0;
const u8 *r_bootstrap, *i_bootstrap, *wrapped_data, *status, *r_proto,
*r_nonce, *i_nonce, *r_capab, *wrapped2, *r_auth;
u16 r_bootstrap_len, i_bootstrap_len, wrapped_data_len, status_len,
r_proto_len, r_nonce_len, i_nonce_len, r_capab_len,
wrapped2_len, r_auth_len;
u8 r_auth2[DPP_MAX_HASH_LEN];
u8 role;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at Authentication Response");
return NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (!auth->initiator || !auth->peer_bi) {
dpp_auth_fail(auth, "Unexpected Authentication Response");
return NULL;
}
auth->waiting_auth_resp = 0;
wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid required Wrapped Data attribute");
return NULL;
}
wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data",
wrapped_data, wrapped_data_len);
attr_len = wrapped_data - 4 - attr_start;
r_bootstrap = dpp_get_attr(attr_start, attr_len,
DPP_ATTR_R_BOOTSTRAP_KEY_HASH,
&r_bootstrap_len);
if (!r_bootstrap || r_bootstrap_len != SHA256_MAC_LEN) {
dpp_auth_fail(auth,
"Missing or invalid required Responder Bootstrapping Key Hash attribute");
return NULL;
}
wpa_hexdump(MSG_DEBUG, "DPP: Responder Bootstrapping Key Hash",
r_bootstrap, r_bootstrap_len);
if (os_memcmp(r_bootstrap, auth->peer_bi->pubkey_hash,
SHA256_MAC_LEN) != 0) {
dpp_auth_fail(auth,
"Unexpected Responder Bootstrapping Key Hash value");
wpa_hexdump(MSG_DEBUG,
"DPP: Expected Responder Bootstrapping Key Hash",
auth->peer_bi->pubkey_hash, SHA256_MAC_LEN);
return NULL;
}
i_bootstrap = dpp_get_attr(attr_start, attr_len,
DPP_ATTR_I_BOOTSTRAP_KEY_HASH,
&i_bootstrap_len);
if (i_bootstrap) {
if (i_bootstrap_len != SHA256_MAC_LEN) {
dpp_auth_fail(auth,
"Invalid Initiator Bootstrapping Key Hash attribute");
return NULL;
}
wpa_hexdump(MSG_MSGDUMP,
"DPP: Initiator Bootstrapping Key Hash",
i_bootstrap, i_bootstrap_len);
if (!auth->own_bi ||
os_memcmp(i_bootstrap, auth->own_bi->pubkey_hash,
SHA256_MAC_LEN) != 0) {
dpp_auth_fail(auth,
"Initiator Bootstrapping Key Hash attribute did not match");
return NULL;
}
} else if (auth->own_bi && auth->own_bi->type == DPP_BOOTSTRAP_PKEX) {
/* PKEX bootstrapping mandates use of mutual authentication */
dpp_auth_fail(auth,
"Missing Initiator Bootstrapping Key Hash attribute");
return NULL;
}
auth->peer_version = 1; /* default to the first version */
status = dpp_get_attr(attr_start, attr_len, DPP_ATTR_STATUS,
&status_len);
if (!status || status_len < 1) {
dpp_auth_fail(auth,
"Missing or invalid required DPP Status attribute");
return NULL;
}
wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
auth->auth_resp_status = status[0];
if (status[0] != DPP_STATUS_OK) {
dpp_auth_resp_rx_status(auth, hdr, attr_start,
attr_len, wrapped_data,
wrapped_data_len, status[0]);
return NULL;
}
if (!i_bootstrap && auth->own_bi) {
wpa_printf(MSG_DEBUG,
"DPP: Responder decided not to use mutual authentication");
auth->own_bi = NULL;
}
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_AUTH_DIRECTION "mutual=%d",
auth->own_bi != NULL);
r_proto = dpp_get_attr(attr_start, attr_len, DPP_ATTR_R_PROTOCOL_KEY,
&r_proto_len);
if (!r_proto) {
dpp_auth_fail(auth,
"Missing required Responder Protocol Key attribute");
return NULL;
}
wpa_hexdump(MSG_MSGDUMP, "DPP: Responder Protocol Key",
r_proto, r_proto_len);
/* N = pI * PR */
pr = dpp_set_pubkey_point(auth->own_protocol_key, r_proto, r_proto_len);
if (!pr) {
dpp_auth_fail(auth, "Invalid Responder Protocol Key");
return NULL;
}
dpp_debug_print_key("Peer (Responder) Protocol Key", pr);
if (dpp_ecdh(auth->own_protocol_key, pr, auth->Nx, &secret_len) < 0) {
dpp_auth_fail(auth, "Failed to derive ECDH shared secret");
goto fail;
}
crypto_ec_key_deinit(auth->peer_protocol_key);
auth->peer_protocol_key = pr;
pr = NULL;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)",
auth->Nx, auth->secret_len);
auth->Nx_len = auth->secret_len;
if (dpp_derive_k2(auth->Nx, auth->secret_len, auth->k2,
auth->curve->hash_len) < 0)
goto fail;
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
goto fail;
if (aes_siv_decrypt(auth->k2, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
r_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_R_NONCE,
&r_nonce_len);
if (!r_nonce || r_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth, "DPP: Missing or invalid R-nonce");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: R-nonce", r_nonce, r_nonce_len);
os_memcpy(auth->r_nonce, r_nonce, r_nonce_len);
i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE,
&i_nonce_len);
if (!i_nonce || i_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth, "Missing or invalid I-nonce");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len);
if (os_memcmp(auth->i_nonce, i_nonce, i_nonce_len) != 0) {
dpp_auth_fail(auth, "I-nonce mismatch");
goto fail;
}
if (auth->own_bi) {
/* Mutual authentication */
if (dpp_auth_derive_l_initiator(auth) < 0)
goto fail;
}
r_capab = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_R_CAPABILITIES,
&r_capab_len);
if (!r_capab || r_capab_len < 1) {
dpp_auth_fail(auth, "Missing or invalid R-capabilities");
goto fail;
}
auth->r_capab = r_capab[0];
wpa_printf(MSG_DEBUG, "DPP: R-capabilities: 0x%02x", auth->r_capab);
role = auth->r_capab & DPP_CAPAB_ROLE_MASK;
if ((auth->allowed_roles ==
(DPP_CAPAB_CONFIGURATOR | DPP_CAPAB_ENROLLEE)) &&
(role == DPP_CAPAB_CONFIGURATOR || role == DPP_CAPAB_ENROLLEE)) {
/* Peer selected its role, so move from "either role" to the
* role that is compatible with peer's selection. */
auth->configurator = role == DPP_CAPAB_ENROLLEE;
wpa_printf(MSG_DEBUG, "DPP: Acting as %s",
auth->configurator ? "Configurator" : "Enrollee");
} else if ((auth->configurator && role != DPP_CAPAB_ENROLLEE) ||
(!auth->configurator && role != DPP_CAPAB_CONFIGURATOR)) {
wpa_printf(MSG_DEBUG, "DPP: Incompatible role selection");
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_FAIL
"Unexpected role in R-capabilities 0x%02x",
role);
if (role != DPP_CAPAB_ENROLLEE &&
role != DPP_CAPAB_CONFIGURATOR)
goto fail;
bin_clear_free(unwrapped, unwrapped_len);
auth->remove_on_tx_status = 1;
return dpp_auth_build_conf(auth, DPP_STATUS_NOT_COMPATIBLE);
}
wrapped2 = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_WRAPPED_DATA, &wrapped2_len);
if (!wrapped2 || wrapped2_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid Secondary Wrapped Data");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped2, wrapped2_len);
if (dpp_derive_bk_ke(auth) < 0)
goto fail;
unwrapped2_len = wrapped2_len - AES_BLOCK_SIZE;
unwrapped2 = os_malloc(unwrapped2_len);
if (!unwrapped2)
goto fail;
if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
wrapped2, wrapped2_len,
0, NULL, NULL, unwrapped2) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped2, unwrapped2_len);
if (dpp_check_attrs(unwrapped2, unwrapped2_len) < 0) {
dpp_auth_fail(auth,
"Invalid attribute in secondary unwrapped data");
goto fail;
}
r_auth = dpp_get_attr(unwrapped2, unwrapped2_len, DPP_ATTR_R_AUTH_TAG,
&r_auth_len);
if (!r_auth || r_auth_len != auth->curve->hash_len) {
dpp_auth_fail(auth,
"Missing or invalid Responder Authenticating Tag");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Received Responder Authenticating Tag",
r_auth, r_auth_len);
/* R-auth' = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */
if (dpp_gen_r_auth(auth, r_auth2) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: Calculated Responder Authenticating Tag",
r_auth2, r_auth_len);
if (os_memcmp(r_auth, r_auth2, r_auth_len) != 0) {
dpp_auth_fail(auth, "Mismatching Responder Authenticating Tag");
bin_clear_free(unwrapped, unwrapped_len);
bin_clear_free(unwrapped2, unwrapped2_len);
auth->remove_on_tx_status = 1;
return dpp_auth_build_conf(auth, DPP_STATUS_AUTH_FAILURE);
}
bin_clear_free(unwrapped, unwrapped_len);
bin_clear_free(unwrapped2, unwrapped2_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AUTH_RESP_IN_PLACE_OF_CONF) {
wpa_printf(MSG_INFO,
"DPP: TESTING - Authentication Response in place of Confirm");
if (dpp_auth_build_resp_ok(auth) < 0)
return NULL;
return wpabuf_dup(auth->resp_msg);
}
#endif /* CONFIG_TESTING_OPTIONS */
return dpp_auth_build_conf(auth, DPP_STATUS_OK);
fail:
bin_clear_free(unwrapped, unwrapped_len);
bin_clear_free(unwrapped2, unwrapped2_len);
crypto_ec_key_deinit(pr);
return NULL;
}
static int dpp_auth_conf_rx_failure(struct dpp_authentication *auth,
const u8 *hdr,
const u8 *attr_start, size_t attr_len,
const u8 *wrapped_data,
u16 wrapped_data_len,
enum dpp_status_error status)
{
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
const u8 *r_nonce;
u16 r_nonce_len;
/* Authentication Confirm failure cases are expected to include
* {R-nonce}k2 in the Wrapped Data attribute. */
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped) {
dpp_auth_fail(auth, "Authentication failed");
goto fail;
}
if (aes_siv_decrypt(auth->k2, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
r_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_R_NONCE,
&r_nonce_len);
if (!r_nonce || r_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth, "DPP: Missing or invalid R-nonce");
goto fail;
}
if (os_memcmp(r_nonce, auth->r_nonce, r_nonce_len) != 0) {
wpa_hexdump(MSG_DEBUG, "DPP: Received R-nonce",
r_nonce, r_nonce_len);
wpa_hexdump(MSG_DEBUG, "DPP: Expected R-nonce",
auth->r_nonce, r_nonce_len);
dpp_auth_fail(auth, "R-nonce mismatch");
goto fail;
}
if (status == DPP_STATUS_NOT_COMPATIBLE)
dpp_auth_fail(auth, "Peer reported incompatible R-capab role");
else if (status == DPP_STATUS_AUTH_FAILURE)
dpp_auth_fail(auth, "Peer reported authentication failure)");
fail:
bin_clear_free(unwrapped, unwrapped_len);
return -1;
}
int dpp_auth_conf_rx(struct dpp_authentication *auth, const u8 *hdr,
const u8 *attr_start, size_t attr_len)
{
const u8 *r_bootstrap, *i_bootstrap, *wrapped_data, *status, *i_auth;
u16 r_bootstrap_len, i_bootstrap_len, wrapped_data_len, status_len,
i_auth_len;
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
u8 i_auth2[DPP_MAX_HASH_LEN];
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_AUTH_CONF) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at Authentication Confirm");
return -1;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (auth->initiator || !auth->own_bi) {
dpp_auth_fail(auth, "Unexpected Authentication Confirm");
return -1;
}
auth->waiting_auth_conf = 0;
wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid required Wrapped Data attribute");
return -1;
}
wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data",
wrapped_data, wrapped_data_len);
attr_len = wrapped_data - 4 - attr_start;
r_bootstrap = dpp_get_attr(attr_start, attr_len,
DPP_ATTR_R_BOOTSTRAP_KEY_HASH,
&r_bootstrap_len);
if (!r_bootstrap || r_bootstrap_len != SHA256_MAC_LEN) {
dpp_auth_fail(auth,
"Missing or invalid required Responder Bootstrapping Key Hash attribute");
return -1;
}
wpa_hexdump(MSG_DEBUG, "DPP: Responder Bootstrapping Key Hash",
r_bootstrap, r_bootstrap_len);
if (os_memcmp(r_bootstrap, auth->own_bi->pubkey_hash,
SHA256_MAC_LEN) != 0) {
wpa_hexdump(MSG_DEBUG,
"DPP: Expected Responder Bootstrapping Key Hash",
auth->peer_bi->pubkey_hash, SHA256_MAC_LEN);
dpp_auth_fail(auth,
"Responder Bootstrapping Key Hash mismatch");
return -1;
}
i_bootstrap = dpp_get_attr(attr_start, attr_len,
DPP_ATTR_I_BOOTSTRAP_KEY_HASH,
&i_bootstrap_len);
if (i_bootstrap) {
if (i_bootstrap_len != SHA256_MAC_LEN) {
dpp_auth_fail(auth,
"Invalid Initiator Bootstrapping Key Hash attribute");
return -1;
}
wpa_hexdump(MSG_MSGDUMP,
"DPP: Initiator Bootstrapping Key Hash",
i_bootstrap, i_bootstrap_len);
if (!auth->peer_bi ||
os_memcmp(i_bootstrap, auth->peer_bi->pubkey_hash,
SHA256_MAC_LEN) != 0) {
dpp_auth_fail(auth,
"Initiator Bootstrapping Key Hash mismatch");
return -1;
}
} else if (auth->peer_bi) {
/* Mutual authentication and peer did not include its
* Bootstrapping Key Hash attribute. */
dpp_auth_fail(auth,
"Missing Initiator Bootstrapping Key Hash attribute");
return -1;
}
status = dpp_get_attr(attr_start, attr_len, DPP_ATTR_STATUS,
&status_len);
if (!status || status_len < 1) {
dpp_auth_fail(auth,
"Missing or invalid required DPP Status attribute");
return -1;
}
wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
if (status[0] == DPP_STATUS_NOT_COMPATIBLE ||
status[0] == DPP_STATUS_AUTH_FAILURE)
return dpp_auth_conf_rx_failure(auth, hdr, attr_start,
attr_len, wrapped_data,
wrapped_data_len, status[0]);
if (status[0] != DPP_STATUS_OK) {
dpp_auth_fail(auth, "Authentication failed");
return -1;
}
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
return -1;
if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
i_auth = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_AUTH_TAG,
&i_auth_len);
if (!i_auth || i_auth_len != auth->curve->hash_len) {
dpp_auth_fail(auth,
"Missing or invalid Initiator Authenticating Tag");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Received Initiator Authenticating Tag",
i_auth, i_auth_len);
/* I-auth' = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |] 1) */
if (dpp_gen_i_auth(auth, i_auth2) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: Calculated Initiator Authenticating Tag",
i_auth2, i_auth_len);
if (os_memcmp(i_auth, i_auth2, i_auth_len) != 0) {
dpp_auth_fail(auth, "Mismatching Initiator Authenticating Tag");
goto fail;
}
bin_clear_free(unwrapped, unwrapped_len);
dpp_auth_success(auth);
return 0;
fail:
bin_clear_free(unwrapped, unwrapped_len);
return -1;
}
static int bin_str_eq(const char *val, size_t len, const char *cmp)
{
return os_strlen(cmp) == len && os_memcmp(val, cmp, len) == 0;
}
struct dpp_configuration * dpp_configuration_alloc(const char *type)
{
struct dpp_configuration *conf;
const char *end;
size_t len;
conf = os_zalloc(sizeof(*conf));
if (!conf)
goto fail;
end = os_strchr(type, ' ');
if (end)
len = end - type;
else
len = os_strlen(type);
if (bin_str_eq(type, len, "psk"))
conf->akm = DPP_AKM_PSK;
else if (bin_str_eq(type, len, "sae"))
conf->akm = DPP_AKM_SAE;
else if (bin_str_eq(type, len, "psk-sae") ||
bin_str_eq(type, len, "psk+sae"))
conf->akm = DPP_AKM_PSK_SAE;
else if (bin_str_eq(type, len, "sae-dpp") ||
bin_str_eq(type, len, "dpp+sae"))
conf->akm = DPP_AKM_SAE_DPP;
else if (bin_str_eq(type, len, "psk-sae-dpp") ||
bin_str_eq(type, len, "dpp+psk+sae"))
conf->akm = DPP_AKM_PSK_SAE_DPP;
else if (bin_str_eq(type, len, "dpp"))
conf->akm = DPP_AKM_DPP;
else
goto fail;
return conf;
fail:
dpp_configuration_free(conf);
return NULL;
}
int dpp_akm_psk(enum dpp_akm akm)
{
return akm == DPP_AKM_PSK || akm == DPP_AKM_PSK_SAE ||
akm == DPP_AKM_PSK_SAE_DPP;
}
int dpp_akm_sae(enum dpp_akm akm)
{
return akm == DPP_AKM_SAE || akm == DPP_AKM_PSK_SAE ||
akm == DPP_AKM_SAE_DPP || akm == DPP_AKM_PSK_SAE_DPP;
}
int dpp_akm_legacy(enum dpp_akm akm)
{
return akm == DPP_AKM_PSK || akm == DPP_AKM_PSK_SAE ||
akm == DPP_AKM_SAE;
}
int dpp_akm_dpp(enum dpp_akm akm)
{
return akm == DPP_AKM_DPP || akm == DPP_AKM_SAE_DPP ||
akm == DPP_AKM_PSK_SAE_DPP;
}
int dpp_akm_ver2(enum dpp_akm akm)
{
return akm == DPP_AKM_SAE_DPP || akm == DPP_AKM_PSK_SAE_DPP;
}
int dpp_configuration_valid(const struct dpp_configuration *conf)
{
if (conf->ssid_len == 0)
return 0;
if (dpp_akm_psk(conf->akm) && !conf->passphrase && !conf->psk_set)
return 0;
if (dpp_akm_sae(conf->akm) && !conf->passphrase)
return 0;
return 1;
}
void dpp_configuration_free(struct dpp_configuration *conf)
{
if (!conf)
return;
str_clear_free(conf->passphrase);
os_free(conf->group_id);
bin_clear_free(conf, sizeof(*conf));
}
static int dpp_configuration_parse_helper(struct dpp_authentication *auth,
const char *cmd, int idx)
{
const char *pos, *end;
struct dpp_configuration *conf_sta = NULL, *conf_ap = NULL;
struct dpp_configuration *conf = NULL;
pos = os_strstr(cmd, " conf=sta-");
if (pos) {
conf_sta = dpp_configuration_alloc(pos + 10);
if (!conf_sta)
goto fail;
conf_sta->netrole = DPP_NETROLE_STA;
conf = conf_sta;
}
pos = os_strstr(cmd, " conf=ap-");
if (pos) {
conf_ap = dpp_configuration_alloc(pos + 9);
if (!conf_ap)
goto fail;
conf_ap->netrole = DPP_NETROLE_AP;
conf = conf_ap;
}
if (!conf)
return 0;
pos = os_strstr(cmd, " ssid=");
if (pos) {
pos += 6;
end = os_strchr(pos, ' ');
conf->ssid_len = end ? (size_t) (end - pos) : os_strlen(pos);
conf->ssid_len /= 2;
if (conf->ssid_len > sizeof(conf->ssid) ||
hexstr2bin(pos, conf->ssid, conf->ssid_len) < 0)
goto fail;
} else {
#ifdef CONFIG_TESTING_OPTIONS
/* use a default SSID for legacy testing reasons */
os_memcpy(conf->ssid, "test", 4);
conf->ssid_len = 4;
#else /* CONFIG_TESTING_OPTIONS */
goto fail;
#endif /* CONFIG_TESTING_OPTIONS */
}
pos = os_strstr(cmd, " ssid_charset=");
if (pos) {
if (conf_ap) {
wpa_printf(MSG_INFO,
"DPP: ssid64 option (ssid_charset param) not allowed for AP enrollee");
goto fail;
}
conf->ssid_charset = atoi(pos + 14);
}
pos = os_strstr(cmd, " pass=");
if (pos) {
size_t pass_len;
pos += 6;
end = os_strchr(pos, ' ');
pass_len = end ? (size_t) (end - pos) : os_strlen(pos);
pass_len /= 2;
if (pass_len > 63 || pass_len < 8)
goto fail;
conf->passphrase = os_zalloc(pass_len + 1);
if (!conf->passphrase ||
hexstr2bin(pos, (u8 *) conf->passphrase, pass_len) < 0)
goto fail;
}
pos = os_strstr(cmd, " psk=");
if (pos) {
pos += 5;
if (hexstr2bin(pos, conf->psk, PMK_LEN) < 0)
goto fail;
conf->psk_set = 1;
}
pos = os_strstr(cmd, " group_id=");
if (pos) {
size_t group_id_len;
pos += 10;
end = os_strchr(pos, ' ');
group_id_len = end ? (size_t) (end - pos) : os_strlen(pos);
conf->group_id = os_malloc(group_id_len + 1);
if (!conf->group_id)
goto fail;
os_memcpy(conf->group_id, pos, group_id_len);
conf->group_id[group_id_len] = '\0';
}
pos = os_strstr(cmd, " expiry=");
if (pos) {
long int val;
pos += 8;
val = strtol(pos, NULL, 0);
if (val <= 0)
goto fail;
conf->netaccesskey_expiry = val;
}
if (!dpp_configuration_valid(conf))
goto fail;
if (idx == 0) {
auth->conf_sta = conf_sta;
auth->conf_ap = conf_ap;
} else if (idx == 1) {
auth->conf2_sta = conf_sta;
auth->conf2_ap = conf_ap;
} else {
goto fail;
}
return 0;
fail:
dpp_configuration_free(conf_sta);
dpp_configuration_free(conf_ap);
return -1;
}
static int dpp_configuration_parse(struct dpp_authentication *auth,
const char *cmd)
{
const char *pos;
char *tmp;
size_t len;
int res;
pos = os_strstr(cmd, " @CONF-OBJ-SEP@ ");
if (!pos)
return dpp_configuration_parse_helper(auth, cmd, 0);
len = pos - cmd;
tmp = os_malloc(len + 1);
if (!tmp)
goto fail;
os_memcpy(tmp, cmd, len);
tmp[len] = '\0';
res = dpp_configuration_parse_helper(auth, cmd, 0);
str_clear_free(tmp);
if (res)
goto fail;
res = dpp_configuration_parse_helper(auth, cmd + len, 1);
if (res)
goto fail;
return 0;
fail:
dpp_configuration_free(auth->conf_sta);
dpp_configuration_free(auth->conf2_sta);
dpp_configuration_free(auth->conf_ap);
dpp_configuration_free(auth->conf2_ap);
return -1;
}
static struct dpp_configurator *
dpp_configurator_get_id(struct dpp_global *dpp, unsigned int id)
{
struct dpp_configurator *conf;
if (!dpp)
return NULL;
dl_list_for_each(conf, &dpp->configurator,
struct dpp_configurator, list) {
if (conf->id == id)
return conf;
}
return NULL;
}
int dpp_set_configurator(struct dpp_global *dpp, void *msg_ctx,
struct dpp_authentication *auth,
const char *cmd)
{
const char *pos;
if (!cmd)
return 0;
wpa_printf(MSG_DEBUG, "DPP: Set configurator parameters: %s", cmd);
pos = os_strstr(cmd, " configurator=");
if (pos) {
pos += 14;
auth->conf = dpp_configurator_get_id(dpp, atoi(pos));
if (!auth->conf) {
wpa_printf(MSG_INFO,
"DPP: Could not find the specified configurator");
return -1;
}
}
pos = os_strstr(cmd, " conn_status=");
if (pos) {
pos += 13;
auth->send_conn_status = atoi(pos);
}
pos = os_strstr(cmd, " akm_use_selector=");
if (pos) {
pos += 18;
auth->akm_use_selector = atoi(pos);
}
if (dpp_configuration_parse(auth, cmd) < 0) {
wpa_msg(msg_ctx, MSG_INFO,
"DPP: Failed to set configurator parameters");
return -1;
}
return 0;
}
void dpp_auth_deinit(struct dpp_authentication *auth)
{
unsigned int i;
if (!auth)
return;
dpp_configuration_free(auth->conf_ap);
dpp_configuration_free(auth->conf2_ap);
dpp_configuration_free(auth->conf_sta);
dpp_configuration_free(auth->conf2_sta);
crypto_ec_key_deinit(auth->own_protocol_key);
crypto_ec_key_deinit(auth->peer_protocol_key);
wpabuf_free(auth->req_msg);
wpabuf_free(auth->resp_msg);
wpabuf_free(auth->conf_req);
for (i = 0; i < auth->num_conf_obj; i++) {
struct dpp_config_obj *conf = &auth->conf_obj[i];
os_free(conf->connector);
wpabuf_free(conf->c_sign_key);
}
wpabuf_free(auth->net_access_key);
dpp_bootstrap_info_free(auth->tmp_own_bi);
#ifdef CONFIG_TESTING_OPTIONS
os_free(auth->config_obj_override);
os_free(auth->discovery_override);
os_free(auth->groups_override);
#endif /* CONFIG_TESTING_OPTIONS */
bin_clear_free(auth, sizeof(*auth));
}
static struct wpabuf *
dpp_build_conf_start(struct dpp_authentication *auth,
struct dpp_configuration *conf, size_t tailroom)
{
struct wpabuf *buf;
#ifdef CONFIG_TESTING_OPTIONS
if (auth->discovery_override)
tailroom += os_strlen(auth->discovery_override);
#endif /* CONFIG_TESTING_OPTIONS */
buf = wpabuf_alloc(200 + tailroom);
if (!buf)
return NULL;
json_start_object(buf, NULL);
json_add_string(buf, "wi-fi_tech", "infra");
json_value_sep(buf);
#ifdef CONFIG_TESTING_OPTIONS
if (auth->discovery_override) {
wpa_printf(MSG_DEBUG, "DPP: TESTING - discovery override: '%s'",
auth->discovery_override);
wpabuf_put_str(buf, "\"discovery\":");
wpabuf_put_str(buf, auth->discovery_override);
json_value_sep(buf);
return buf;
}
#endif /* CONFIG_TESTING_OPTIONS */
json_start_object(buf, "discovery");
if (((!conf->ssid_charset || auth->peer_version < 2) &&
json_add_string_escape(buf, "ssid", conf->ssid,
conf->ssid_len) < 0) ||
((conf->ssid_charset && auth->peer_version >= 2) &&
json_add_base64url(buf, "ssid64", conf->ssid,
conf->ssid_len) < 0)) {
wpabuf_free(buf);
return NULL;
}
if (conf->ssid_charset > 0) {
json_value_sep(buf);
json_add_int(buf, "ssid_charset", conf->ssid_charset);
}
json_end_object(buf);
json_value_sep(buf);
return buf;
}
static int dpp_build_jwk(struct wpabuf *buf, const char *name, struct crypto_ec_key *key,
const char *kid, const struct dpp_curve_params *curve)
{
struct wpabuf *pub;
const u8 *pos;
int ret = -1;
pub = dpp_get_pubkey_point(key, 0);
if (!pub)
goto fail;
json_start_object(buf, name);
json_add_string(buf, "kty", "EC");
json_value_sep(buf);
json_add_string(buf, "crv", curve->jwk_crv);
json_value_sep(buf);
pos = wpabuf_head(pub);
if (json_add_base64url(buf, "x", pos, curve->prime_len) < 0)
goto fail;
json_value_sep(buf);
pos += curve->prime_len;
if (json_add_base64url(buf, "y", pos, curve->prime_len) < 0)
goto fail;
if (kid) {
json_value_sep(buf);
json_add_string(buf, "kid", kid);
}
json_end_object(buf);
ret = 0;
fail:
wpabuf_free(pub);
return ret;
}
static void dpp_build_legacy_cred_params(struct wpabuf *buf,
struct dpp_configuration *conf)
{
if (conf->passphrase && os_strlen(conf->passphrase) < 64) {
json_add_string_escape(buf, "pass", conf->passphrase,
os_strlen(conf->passphrase));
} else if (conf->psk_set) {
char psk[2 * sizeof(conf->psk) + 1];
wpa_snprintf_hex(psk, sizeof(psk),
conf->psk, sizeof(conf->psk));
json_add_string(buf, "psk_hex", psk);
forced_memzero(psk, sizeof(psk));
}
}
static const char * dpp_netrole_str(enum dpp_netrole netrole)
{
switch (netrole) {
case DPP_NETROLE_STA:
return "sta";
case DPP_NETROLE_AP:
return "ap";
case DPP_NETROLE_CONFIGURATOR:
return "configurator";
default:
return "??";
}
}
int dpp_get_config_obj_hash(char *signed1, size_t signed1_len,
char *signed2, size_t signed2_len,
unsigned char *hash, int hash_len)
{
const char *dot = ".";
int ret = -1;
const u8 *addr[3];
size_t len[3];
#ifdef ESP_SUPPLICANT
if (hash_len != SHA256_MAC_LEN)
return ret;
#endif
addr[0] = (unsigned char *)signed1;
len[0] = signed1_len;
addr[1] = (unsigned char *)dot;
len[1] = 1;
addr[2] = (unsigned char *)signed2;
len[2] = signed2_len;
ret = sha256_vector(3, addr, len, hash);
return ret;
}
static struct wpabuf *
dpp_build_conf_obj_dpp(struct dpp_authentication *auth,
struct dpp_configuration *conf)
{
struct wpabuf *buf = NULL;
char *signed1 = NULL, *signed2 = NULL, *signed3 = NULL;
size_t tailroom;
const struct dpp_curve_params *curve;
struct wpabuf *jws_prot_hdr;
size_t signed1_len, signed2_len, signed3_len;
struct wpabuf *dppcon = NULL;
unsigned char *signature = NULL;
size_t signature_len;
struct crypto_bignum *r = NULL, *s = NULL;
size_t extra_len = 1000;
int incl_legacy;
enum dpp_akm akm;
const char *akm_str;
unsigned char *hash = NULL;
if (!auth->conf) {
wpa_printf(MSG_INFO,
"DPP: No configurator specified - cannot generate DPP config object");
goto fail;
}
curve = auth->conf->curve;
akm = conf->akm;
if (dpp_akm_ver2(akm) && auth->peer_version < 2) {
wpa_printf(MSG_DEBUG,
"DPP: Convert DPP+legacy credential to DPP-only for peer that does not support version 2");
akm = DPP_AKM_DPP;
}
#ifdef CONFIG_TESTING_OPTIONS
if (auth->groups_override)
extra_len += os_strlen(auth->groups_override);
#endif /* CONFIG_TESTING_OPTIONS */
if (conf->group_id)
extra_len += os_strlen(conf->group_id);
/* Connector (JSON dppCon object) */
dppcon = wpabuf_alloc(extra_len + 2 * auth->curve->prime_len * 4 / 3);
if (!dppcon)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (auth->groups_override) {
wpabuf_put_u8(dppcon, '{');
if (auth->groups_override) {
wpa_printf(MSG_DEBUG,
"DPP: TESTING - groups override: '%s'",
auth->groups_override);
wpabuf_put_str(dppcon, "\"groups\":");
wpabuf_put_str(dppcon, auth->groups_override);
json_value_sep(dppcon);
}
goto skip_groups;
}
#endif /* CONFIG_TESTING_OPTIONS */
json_start_object(dppcon, NULL);
json_start_array(dppcon, "groups");
json_start_object(dppcon, NULL);
json_add_string(dppcon, "groupId",
conf->group_id ? conf->group_id : "*");
json_value_sep(dppcon);
json_add_string(dppcon, "netRole", dpp_netrole_str(conf->netrole));
json_end_object(dppcon);
json_end_array(dppcon);
json_value_sep(dppcon);
#ifdef CONFIG_TESTING_OPTIONS
skip_groups:
#endif /* CONFIG_TESTING_OPTIONS */
if (dpp_build_jwk(dppcon, "netAccessKey", auth->peer_protocol_key, NULL,
auth->curve) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Failed to build netAccessKey JWK");
goto fail;
}
if (conf->netaccesskey_expiry) {
struct os_tm tm;
char expiry[30];
if (os_gmtime(conf->netaccesskey_expiry, &tm) < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to generate expiry string");
goto fail;
}
os_snprintf(expiry, sizeof(expiry),
"%04u-%02u-%02uT%02u:%02u:%02uZ",
tm.year, tm.month, tm.day,
tm.hour, tm.min, tm.sec);
json_value_sep(dppcon);
json_add_string(dppcon, "expiry", expiry);
}
json_end_object(dppcon);
wpa_printf(MSG_DEBUG, "DPP: dppCon: %s",
(const char *) wpabuf_head(dppcon));
jws_prot_hdr = wpabuf_alloc(100);
if (!jws_prot_hdr)
goto fail;
json_start_object(jws_prot_hdr, NULL);
json_add_string(jws_prot_hdr, "typ", "dppCon");
json_value_sep(jws_prot_hdr);
json_add_string(jws_prot_hdr, "kid", auth->conf->kid);
json_value_sep(jws_prot_hdr);
json_add_string(jws_prot_hdr, "alg", curve->jws_alg);
json_end_object(jws_prot_hdr);
signed1 = base64_url_encode(wpabuf_head(jws_prot_hdr),
wpabuf_len(jws_prot_hdr),
&signed1_len);
wpabuf_free(jws_prot_hdr);
signed2 = base64_url_encode(wpabuf_head(dppcon), wpabuf_len(dppcon),
&signed2_len);
if (!signed1 || !signed2)
goto fail;
hash = os_malloc(curve->hash_len);
if (!hash) {
goto fail;
}
if (dpp_get_config_obj_hash(signed1, signed1_len, signed2, signed1_len, hash, curve->hash_len) < 0)
goto fail;
r = crypto_bignum_init();
s = crypto_bignum_init();
if (crypto_ecdsa_get_sign(hash, r, s, auth->conf->csign, curve->hash_len) < 0)
goto fail;
signature = os_malloc(2 * curve->prime_len);
if (!signature)
goto fail;
if (dpp_bn2bin_pad(r, signature, curve->prime_len) < 0 ||
dpp_bn2bin_pad(s, signature + curve->prime_len,
curve->prime_len) < 0)
goto fail;
signature_len = 2 * curve->prime_len;
wpa_hexdump(MSG_DEBUG, "DPP: signedConnector ECDSA signature (raw r,s)",
signature, signature_len);
signed3 = base64_url_encode(signature, signature_len, &signed3_len);
if (!signed3)
goto fail;
incl_legacy = dpp_akm_psk(akm) || dpp_akm_sae(akm);
tailroom = 1000;
tailroom += 2 * curve->prime_len * 4 / 3 + os_strlen(auth->conf->kid);
tailroom += signed1_len + signed2_len + signed3_len;
if (incl_legacy)
tailroom += 1000;
buf = dpp_build_conf_start(auth, conf, tailroom);
if (!buf)
goto fail;
if (auth->akm_use_selector && dpp_akm_ver2(akm))
akm_str = dpp_akm_selector_str(akm);
else
akm_str = dpp_akm_str(akm);
json_start_object(buf, "cred");
json_add_string(buf, "akm", akm_str);
json_value_sep(buf);
if (incl_legacy) {
dpp_build_legacy_cred_params(buf, conf);
json_value_sep(buf);
}
wpabuf_put_str(buf, "\"signedConnector\":\"");
wpabuf_put_str(buf, signed1);
wpabuf_put_u8(buf, '.');
wpabuf_put_str(buf, signed2);
wpabuf_put_u8(buf, '.');
wpabuf_put_str(buf, signed3);
wpabuf_put_str(buf, "\"");
json_value_sep(buf);
if (dpp_build_jwk(buf, "csign", auth->conf->csign, auth->conf->kid,
curve) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Failed to build csign JWK");
goto fail;
}
json_end_object(buf);
json_end_object(buf);
wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Configuration Object",
(u8 *)wpabuf_head(buf), wpabuf_len(buf));
out:
if (signed1)
os_free(signed1);
if (signed2)
os_free(signed2);
if (signed3)
os_free(signed3);
if (hash)
os_free(hash);
if (signature)
os_free(signature);
crypto_bignum_deinit(r, 0);
crypto_bignum_deinit(s, 0);
wpabuf_free(dppcon);
return buf;
fail:
wpa_printf(MSG_DEBUG, "DPP: Failed to build configuration object");
wpabuf_free(buf);
buf = NULL;
goto out;
}
static struct wpabuf *
dpp_build_conf_obj_legacy(struct dpp_authentication *auth,
struct dpp_configuration *conf)
{
struct wpabuf *buf;
const char *akm_str;
buf = dpp_build_conf_start(auth, conf, 1000);
if (!buf)
return NULL;
if (auth->akm_use_selector && dpp_akm_ver2(conf->akm))
akm_str = dpp_akm_selector_str(conf->akm);
else
akm_str = dpp_akm_str(conf->akm);
json_start_object(buf, "cred");
json_add_string(buf, "akm", akm_str);
json_value_sep(buf);
dpp_build_legacy_cred_params(buf, conf);
json_end_object(buf);
json_end_object(buf);
wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Configuration Object (legacy)",
(u8 *)wpabuf_head(buf), wpabuf_len(buf));
return buf;
}
static struct wpabuf *
dpp_build_conf_obj(struct dpp_authentication *auth, enum dpp_netrole netrole,
int idx)
{
struct dpp_configuration *conf = NULL;
#ifdef CONFIG_TESTING_OPTIONS
if (auth->config_obj_override) {
if (idx != 0)
return NULL;
wpa_printf(MSG_DEBUG, "DPP: Testing - Config Object override");
return wpabuf_alloc_copy(auth->config_obj_override,
os_strlen(auth->config_obj_override));
}
#endif /* CONFIG_TESTING_OPTIONS */
if (idx == 0) {
if (netrole == DPP_NETROLE_STA)
conf = auth->conf_sta;
else if (netrole == DPP_NETROLE_AP)
conf = auth->conf_ap;
} else if (idx == 1) {
if (netrole == DPP_NETROLE_STA)
conf = auth->conf2_sta;
else if (netrole == DPP_NETROLE_AP)
conf = auth->conf2_ap;
}
if (!conf) {
if (idx == 0)
wpa_printf(MSG_DEBUG,
"DPP: No configuration available for Enrollee(%s) - reject configuration request",
dpp_netrole_str(netrole));
return NULL;
}
if (dpp_akm_dpp(conf->akm))
return dpp_build_conf_obj_dpp(auth, conf);
return dpp_build_conf_obj_legacy(auth, conf);
}
static struct wpabuf *
dpp_build_conf_resp(struct dpp_authentication *auth, const u8 *e_nonce,
u16 e_nonce_len, enum dpp_netrole netrole)
{
struct wpabuf *conf, *conf2 = NULL;
size_t clear_len, attr_len;
struct wpabuf *clear = NULL, *msg = NULL;
u8 *wrapped;
const u8 *addr[1];
size_t len[1];
enum dpp_status_error status;
conf = dpp_build_conf_obj(auth, netrole, 0);
if (conf) {
wpa_hexdump_ascii(MSG_DEBUG, "DPP: configurationObject JSON",
(u8 *)wpabuf_head(conf), wpabuf_len(conf));
conf2 = dpp_build_conf_obj(auth, netrole, 1);
}
status = conf ? DPP_STATUS_OK : DPP_STATUS_CONFIGURE_FAILURE;
auth->conf_resp_status = status;
/* { E-nonce, configurationObject[, sendConnStatus]}ke */
clear_len = 4 + e_nonce_len;
if (conf)
clear_len += 4 + wpabuf_len(conf);
if (conf2)
clear_len += 4 + wpabuf_len(conf2);
if (auth->peer_version >= 2 && auth->send_conn_status &&
netrole == DPP_NETROLE_STA)
clear_len += 4;
clear = wpabuf_alloc(clear_len);
attr_len = 4 + 1 + 4 + clear_len + AES_BLOCK_SIZE;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_RESP)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = wpabuf_alloc(attr_len);
if (!clear || !msg)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_E_NONCE_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no E-nonce");
goto skip_e_nonce;
}
if (dpp_test == DPP_TEST_E_NONCE_MISMATCH_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - E-nonce mismatch");
wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
wpabuf_put_le16(clear, e_nonce_len);
wpabuf_put_data(clear, e_nonce, e_nonce_len - 1);
wpabuf_put_u8(clear, e_nonce[e_nonce_len - 1] ^ 0x01);
goto skip_e_nonce;
}
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
goto skip_wrapped_data;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* E-nonce */
wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
wpabuf_put_le16(clear, e_nonce_len);
wpabuf_put_data(clear, e_nonce, e_nonce_len);
#ifdef CONFIG_TESTING_OPTIONS
skip_e_nonce:
if (dpp_test == DPP_TEST_NO_CONFIG_OBJ_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - Config Object");
goto skip_config_obj;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (conf) {
wpabuf_put_le16(clear, DPP_ATTR_CONFIG_OBJ);
wpabuf_put_le16(clear, wpabuf_len(conf));
wpabuf_put_buf(clear, conf);
}
if (auth->peer_version >= 2 && conf2) {
wpabuf_put_le16(clear, DPP_ATTR_CONFIG_OBJ);
wpabuf_put_le16(clear, wpabuf_len(conf2));
wpabuf_put_buf(clear, conf2);
} else if (conf2) {
wpa_printf(MSG_DEBUG,
"DPP: Second Config Object available, but peer does not support more than one");
}
if (auth->peer_version >= 2 && auth->send_conn_status &&
netrole == DPP_NETROLE_STA) {
wpa_printf(MSG_DEBUG, "DPP: sendConnStatus");
wpabuf_put_le16(clear, DPP_ATTR_SEND_CONN_STATUS);
wpabuf_put_le16(clear, 0);
}
#ifdef CONFIG_TESTING_OPTIONS
skip_config_obj:
if (dpp_test == DPP_TEST_NO_STATUS_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - Status");
goto skip_status;
}
if (dpp_test == DPP_TEST_INVALID_STATUS_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
status = 255;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* DPP Status */
dpp_build_attr_status(msg, status);
#ifdef CONFIG_TESTING_OPTIONS
skip_status:
#endif /* CONFIG_TESTING_OPTIONS */
addr[0] = wpabuf_head(msg);
len[0] = wpabuf_len(msg);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]);
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
wpabuf_head(clear), wpabuf_len(clear),
1, addr, len, wrapped) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump_buf(MSG_DEBUG,
"DPP: Configuration Response attributes", msg);
out:
wpabuf_free(conf);
wpabuf_free(conf2);
wpabuf_free(clear);
return msg;
fail:
wpabuf_free(msg);
msg = NULL;
goto out;
}
struct wpabuf *
dpp_conf_req_rx(struct dpp_authentication *auth, const u8 *attr_start,
size_t attr_len)
{
const u8 *wrapped_data, *e_nonce, *config_attr;
u16 wrapped_data_len, e_nonce_len, config_attr_len;
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
struct wpabuf *resp = NULL;
struct json_token *root = NULL, *token;
enum dpp_netrole netrole;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_CONF_REQ) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at Config Request");
return NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (dpp_check_attrs(attr_start, attr_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in config request");
return NULL;
}
wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid required Wrapped Data attribute");
return NULL;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
return NULL;
if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
0, NULL, NULL, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_ENROLLEE_NONCE,
&e_nonce_len);
if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth,
"Missing or invalid Enrollee Nonce attribute");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
os_memcpy(auth->e_nonce, e_nonce, e_nonce_len);
config_attr = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_CONFIG_ATTR_OBJ,
&config_attr_len);
if (!config_attr) {
dpp_auth_fail(auth,
"Missing or invalid Config Attributes attribute");
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG, "DPP: Config Attributes",
(u8 *)config_attr, config_attr_len);
root = json_parse((const char *) config_attr, config_attr_len);
if (!root) {
dpp_auth_fail(auth, "Could not parse Config Attributes");
goto fail;
}
token = json_get_member(root, "name");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No Config Attributes - name");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: Enrollee name = '%s'", token->string);
token = json_get_member(root, "wi-fi_tech");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No Config Attributes - wi-fi_tech");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: wi-fi_tech = '%s'", token->string);
if (os_strcmp(token->string, "infra") != 0) {
wpa_printf(MSG_DEBUG, "DPP: Unsupported wi-fi_tech '%s'",
token->string);
dpp_auth_fail(auth, "Unsupported wi-fi_tech");
goto fail;
}
token = json_get_member(root, "netRole");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No Config Attributes - netRole");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: netRole = '%s'", token->string);
if (os_strcmp(token->string, "sta") == 0) {
netrole = DPP_NETROLE_STA;
} else if (os_strcmp(token->string, "ap") == 0) {
netrole = DPP_NETROLE_AP;
} else if (os_strcmp(token->string, "configurator") == 0) {
netrole = DPP_NETROLE_CONFIGURATOR;
} else {
wpa_printf(MSG_DEBUG, "DPP: Unsupported netRole '%s'",
token->string);
dpp_auth_fail(auth, "Unsupported netRole");
goto fail;
}
token = json_get_member(root, "mudurl");
if (token && token->type == JSON_STRING)
wpa_printf(MSG_DEBUG, "DPP: mudurl = '%s'", token->string);
token = json_get_member(root, "bandSupport");
if (token && token->type == JSON_ARRAY) {
wpa_printf(MSG_DEBUG, "DPP: bandSupport");
token = token->child;
while (token) {
if (token->type != JSON_NUMBER)
wpa_printf(MSG_DEBUG,
"DPP: Invalid bandSupport array member type");
else
wpa_printf(MSG_DEBUG,
"DPP: Supported global operating class: %d",
token->number);
token = token->sibling;
}
}
resp = dpp_build_conf_resp(auth, e_nonce, e_nonce_len, netrole);
fail:
json_free(root);
os_free(unwrapped);
return resp;
}
static int dpp_parse_cred_legacy(struct dpp_config_obj *conf,
struct json_token *cred)
{
struct json_token *pass, *psk_hex;
wpa_printf(MSG_DEBUG, "DPP: Legacy akm=psk credential");
pass = json_get_member(cred, "pass");
psk_hex = json_get_member(cred, "psk_hex");
if (pass && pass->type == JSON_STRING) {
size_t len = os_strlen(pass->string);
wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Legacy passphrase",
(u8 *)pass->string, len);
if (len < 8 || len > 63)
return -1;
os_strlcpy(conf->passphrase, pass->string,
sizeof(conf->passphrase));
} else if (psk_hex && psk_hex->type == JSON_STRING) {
if (dpp_akm_sae(conf->akm) && !dpp_akm_psk(conf->akm)) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected psk_hex with akm=sae");
return -1;
}
if (os_strlen(psk_hex->string) != PMK_LEN * 2 ||
hexstr2bin(psk_hex->string, conf->psk, PMK_LEN) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Invalid psk_hex encoding");
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "DPP: Legacy PSK",
conf->psk, PMK_LEN);
conf->psk_set = 1;
} else {
wpa_printf(MSG_DEBUG, "DPP: No pass or psk_hex strings found");
return -1;
}
if (dpp_akm_sae(conf->akm) && !conf->passphrase[0]) {
wpa_printf(MSG_DEBUG, "DPP: No pass for sae found");
return -1;
}
return 0;
}
static struct crypto_ec_key * dpp_parse_jwk(struct json_token *jwk,
const struct dpp_curve_params **key_curve)
{
struct json_token *token;
const struct dpp_curve_params *curve;
struct wpabuf *x = NULL, *y = NULL;
unsigned char *a = NULL;
struct crypto_ec_group *group;
struct crypto_ec_key *pkey = NULL;
size_t len;
token = json_get_member(jwk, "kty");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: No kty in JWK");
goto fail;
}
if (os_strcmp(token->string, "EC") != 0) {
wpa_printf(MSG_DEBUG, "DPP: Unexpected JWK kty '%s'",
token->string);
goto fail;
}
token = json_get_member(jwk, "crv");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: No crv in JWK");
goto fail;
}
curve = dpp_get_curve_jwk_crv(token->string);
if (!curve) {
wpa_printf(MSG_DEBUG, "DPP: Unsupported JWK crv '%s'",
token->string);
goto fail;
}
x = json_get_member_base64url(jwk, "x");
if (!x) {
wpa_printf(MSG_DEBUG, "DPP: No x in JWK");
goto fail;
}
wpa_hexdump_buf(MSG_DEBUG, "DPP: JWK x", x);
if (wpabuf_len(x) != curve->prime_len) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected JWK x length %u (expected %u for curve %s)",
(unsigned int) wpabuf_len(x),
(unsigned int) curve->prime_len, curve->name);
goto fail;
}
y = json_get_member_base64url(jwk, "y");
if (!y) {
wpa_printf(MSG_DEBUG, "DPP: No y in JWK");
goto fail;
}
wpa_hexdump_buf(MSG_DEBUG, "DPP: JWK y", y);
if (wpabuf_len(y) != curve->prime_len) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected JWK y length %u (expected %u for curve %s)",
(unsigned int) wpabuf_len(y),
(unsigned int) curve->prime_len, curve->name);
goto fail;
}
group = crypto_ec_get_group_byname(curve->name);
if (!group) {
wpa_printf(MSG_DEBUG, "DPP: Could not prepare group for JWK");
goto fail;
}
len = wpabuf_len(x) + wpabuf_len(y);
a = os_zalloc(len);
os_memcpy(a, wpabuf_head(x), wpabuf_len(x));
os_memcpy(a + wpabuf_len(x), wpabuf_head(y), wpabuf_len(y));
pkey = crypto_ec_key_set_pub(group, a, len);
crypto_ec_deinit((struct crypto_ec *)group);
*key_curve = curve;
fail:
wpabuf_free(x);
wpabuf_free(y);
os_free(a);
return pkey;
}
int dpp_key_expired(const char *timestamp, os_time_t *expiry)
{
struct os_time now;
unsigned int year, month, day, hour, min, sec;
os_time_t utime;
const char *pos;
/* ISO 8601 date and time:
* <date>T<time>
* YYYY-MM-DDTHH:MM:SSZ
* YYYY-MM-DDTHH:MM:SS+03:00
*/
if (os_strlen(timestamp) < 19) {
wpa_printf(MSG_DEBUG,
"DPP: Too short timestamp - assume expired key");
return 1;
}
if (sscanf(timestamp, "%04u-%02u-%02uT%02u:%02u:%02u",
&year, &month, &day, &hour, &min, &sec) != 6) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to parse expiration day - assume expired key");
return 1;
}
if (os_mktime(year, month, day, hour, min, sec, &utime) < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Invalid date/time information - assume expired key");
return 1;
}
pos = timestamp + 19;
if (*pos == 'Z' || *pos == '\0') {
/* In UTC - no need to adjust */
} else if (*pos == '-' || *pos == '+') {
int items;
/* Adjust local time to UTC */
items = sscanf(pos + 1, "%02u:%02u", &hour, &min);
if (items < 1) {
wpa_printf(MSG_DEBUG,
"DPP: Invalid time zone designator (%s) - assume expired key",
pos);
return 1;
}
if (*pos == '-')
utime += 3600 * hour;
if (*pos == '+')
utime -= 3600 * hour;
if (items > 1) {
if (*pos == '-')
utime += 60 * min;
if (*pos == '+')
utime -= 60 * min;
}
} else {
wpa_printf(MSG_DEBUG,
"DPP: Invalid time zone designator (%s) - assume expired key",
pos);
return 1;
}
if (expiry)
*expiry = utime;
if (os_get_time(&now) < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Cannot get current time - assume expired key");
return 1;
}
if (now.sec > utime) {
wpa_printf(MSG_DEBUG, "DPP: Key has expired (%lu < %lu)",
utime, now.sec);
return 1;
}
return 0;
}
static int dpp_parse_connector(struct dpp_authentication *auth,
struct dpp_config_obj *conf,
const unsigned char *payload,
u16 payload_len)
{
struct json_token *root, *groups, *netkey, *token;
int ret = -1;
struct crypto_ec_key *key = NULL;
const struct dpp_curve_params *curve;
unsigned int rules = 0;
root = json_parse((const char *) payload, payload_len);
if (!root) {
wpa_printf(MSG_DEBUG, "DPP: JSON parsing of connector failed");
goto fail;
}
groups = json_get_member(root, "groups");
if (!groups || groups->type != JSON_ARRAY) {
wpa_printf(MSG_DEBUG, "DPP: No groups array found");
goto skip_groups;
}
for (token = groups->child; token; token = token->sibling) {
struct json_token *id, *role;
id = json_get_member(token, "groupId");
if (!id || id->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: Missing groupId string");
goto fail;
}
role = json_get_member(token, "netRole");
if (!role || role->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: Missing netRole string");
goto fail;
}
wpa_printf(MSG_DEBUG,
"DPP: connector group: groupId='%s' netRole='%s'",
id->string, role->string);
rules++;
}
skip_groups:
if (!rules) {
wpa_printf(MSG_DEBUG,
"DPP: Connector includes no groups");
goto fail;
}
token = json_get_member(root, "expiry");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG,
"DPP: No expiry string found - connector does not expire");
} else {
wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string);
if (dpp_key_expired(token->string,
&auth->net_access_key_expiry)) {
wpa_printf(MSG_DEBUG,
"DPP: Connector (netAccessKey) has expired");
goto fail;
}
}
netkey = json_get_member(root, "netAccessKey");
if (!netkey || netkey->type != JSON_OBJECT) {
wpa_printf(MSG_DEBUG, "DPP: No netAccessKey object found");
goto fail;
}
key = dpp_parse_jwk(netkey, &curve);
if (!key)
goto fail;
dpp_debug_print_key("DPP: Received netAccessKey", key);
if (crypto_ec_key_compare(key, auth->own_protocol_key) != 1) {
wpa_printf(MSG_DEBUG,
"DPP: netAccessKey in connector does not match own protocol key");
#ifdef CONFIG_TESTING_OPTIONS
if (auth->ignore_netaccesskey_mismatch) {
wpa_printf(MSG_DEBUG,
"DPP: TESTING - skip netAccessKey mismatch");
} else {
goto fail;
}
#else /* CONFIG_TESTING_OPTIONS */
goto fail;
#endif /* CONFIG_TESTING_OPTIONS */
}
ret = 0;
fail:
crypto_ec_key_deinit(key);
json_free(root);
return ret;
}
static void dpp_copy_csign(struct dpp_config_obj *conf, struct crypto_ec_key *csign)
{
unsigned char *der = NULL;
int der_len;
der_len = crypto_write_pubkey_der(csign, &der);
if (der_len <= 0)
return;
wpabuf_free(conf->c_sign_key);
conf->c_sign_key = wpabuf_alloc_copy(der, der_len);
crypto_free_buffer(der);
}
static void dpp_copy_netaccesskey(struct dpp_authentication *auth,
struct dpp_config_obj *conf)
{
unsigned char *der = NULL;
int der_len;
if (crypto_ec_get_priv_key_der(auth->own_protocol_key, &der, &der_len) < 0)
return;
wpabuf_free(auth->net_access_key);
auth->net_access_key = wpabuf_alloc_copy(der, der_len);
crypto_free_buffer(der);
}
static int dpp_parse_cred_dpp(struct dpp_authentication *auth,
struct dpp_config_obj *conf,
struct json_token *cred)
{
struct dpp_signed_connector_info info;
struct json_token *token, *csign;
int ret = -1;
struct crypto_ec_key *csign_pub = NULL;
const struct dpp_curve_params *key_curve = NULL;
const char *signed_connector;
os_memset(&info, 0, sizeof(info));
if (dpp_akm_psk(conf->akm) || dpp_akm_sae(conf->akm)) {
wpa_printf(MSG_DEBUG,
"DPP: Legacy credential included in Connector credential");
if (dpp_parse_cred_legacy(conf, cred) < 0)
return -1;
}
wpa_printf(MSG_DEBUG, "DPP: Connector credential");
csign = json_get_member(cred, "csign");
if (!csign || csign->type != JSON_OBJECT) {
wpa_printf(MSG_DEBUG, "DPP: No csign JWK in JSON");
goto fail;
}
csign_pub = dpp_parse_jwk(csign, &key_curve);
if (!csign_pub) {
wpa_printf(MSG_DEBUG, "DPP: Failed to parse csign JWK");
goto fail;
}
dpp_debug_print_key("DPP: Received C-sign-key", csign_pub);
token = json_get_member(cred, "signedConnector");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: No signedConnector string found");
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG, "DPP: signedConnector",
(u8 *)token->string, os_strlen(token->string));
signed_connector = token->string;
if (os_strchr(signed_connector, '"') ||
os_strchr(signed_connector, '\n')) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected character in signedConnector");
goto fail;
}
if (dpp_process_signed_connector(&info, csign_pub,
signed_connector) != DPP_STATUS_OK)
goto fail;
if (dpp_parse_connector(auth, conf,
info.payload, info.payload_len) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Failed to parse connector");
goto fail;
}
os_free(conf->connector);
conf->connector = os_strdup(signed_connector);
dpp_copy_csign(conf, csign_pub);
dpp_copy_netaccesskey(auth, conf);
ret = 0;
fail:
crypto_ec_key_deinit(csign_pub);
os_free(info.payload);
return ret;
}
const char * dpp_akm_str(enum dpp_akm akm)
{
switch (akm) {
case DPP_AKM_DPP:
return "dpp";
case DPP_AKM_PSK:
return "psk";
case DPP_AKM_SAE:
return "sae";
case DPP_AKM_PSK_SAE:
return "psk+sae";
case DPP_AKM_SAE_DPP:
return "dpp+sae";
case DPP_AKM_PSK_SAE_DPP:
return "dpp+psk+sae";
default:
return "??";
}
}
const char * dpp_akm_selector_str(enum dpp_akm akm)
{
switch (akm) {
case DPP_AKM_DPP:
return "506F9A02";
case DPP_AKM_PSK:
return "000FAC02+000FAC06";
case DPP_AKM_SAE:
return "000FAC08";
case DPP_AKM_PSK_SAE:
return "000FAC02+000FAC06+000FAC08";
case DPP_AKM_SAE_DPP:
return "506F9A02+000FAC08";
case DPP_AKM_PSK_SAE_DPP:
return "506F9A02+000FAC08+000FAC02+000FAC06";
default:
return "??";
}
}
static enum dpp_akm dpp_akm_from_str(const char *akm)
{
const char *pos;
int dpp = 0, psk = 0, sae = 0;
if (os_strcmp(akm, "psk") == 0)
return DPP_AKM_PSK;
if (os_strcmp(akm, "sae") == 0)
return DPP_AKM_SAE;
if (os_strcmp(akm, "psk+sae") == 0)
return DPP_AKM_PSK_SAE;
if (os_strcmp(akm, "dpp") == 0)
return DPP_AKM_DPP;
if (os_strcmp(akm, "dpp+sae") == 0)
return DPP_AKM_SAE_DPP;
if (os_strcmp(akm, "dpp+psk+sae") == 0)
return DPP_AKM_PSK_SAE_DPP;
pos = akm;
while (*pos) {
if (os_strlen(pos) < 8)
break;
if (os_strncasecmp(pos, "506F9A02", 8) == 0)
dpp = 1;
else if (os_strncasecmp(pos, "000FAC02", 8) == 0)
psk = 1;
else if (os_strncasecmp(pos, "000FAC06", 8) == 0)
psk = 1;
else if (os_strncasecmp(pos, "000FAC08", 8) == 0)
sae = 1;
pos += 8;
if (*pos != '+')
break;
pos++;
}
if (dpp && psk && sae)
return DPP_AKM_PSK_SAE_DPP;
if (dpp && sae)
return DPP_AKM_SAE_DPP;
if (dpp)
return DPP_AKM_DPP;
if (psk && sae)
return DPP_AKM_PSK_SAE;
if (sae)
return DPP_AKM_SAE;
if (psk)
return DPP_AKM_PSK;
return DPP_AKM_UNKNOWN;
}
static int dpp_parse_conf_obj(struct dpp_authentication *auth,
const u8 *conf_obj, u16 conf_obj_len)
{
int ret = -1;
struct json_token *root, *token, *discovery, *cred;
struct dpp_config_obj *conf;
struct wpabuf *ssid64 = NULL;
root = json_parse((const char *) conf_obj, conf_obj_len);
if (!root)
return -1;
if (root->type != JSON_OBJECT) {
dpp_auth_fail(auth, "JSON root is not an object");
goto fail;
}
token = json_get_member(root, "wi-fi_tech");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No wi-fi_tech string value found");
goto fail;
}
if (os_strcmp(token->string, "infra") != 0) {
wpa_printf(MSG_DEBUG, "DPP: Unsupported wi-fi_tech value: '%s'",
token->string);
dpp_auth_fail(auth, "Unsupported wi-fi_tech value");
goto fail;
}
discovery = json_get_member(root, "discovery");
if (!discovery || discovery->type != JSON_OBJECT) {
dpp_auth_fail(auth, "No discovery object in JSON");
goto fail;
}
ssid64 = json_get_member_base64url(discovery, "ssid64");
if (ssid64) {
wpa_hexdump_ascii(MSG_DEBUG, "DPP: discovery::ssid64",
(u8 *)wpabuf_head(ssid64), wpabuf_len(ssid64));
if (wpabuf_len(ssid64) > SSID_MAX_LEN) {
dpp_auth_fail(auth, "Too long discovery::ssid64 value");
goto fail;
}
} else {
token = json_get_member(discovery, "ssid");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth,
"No discovery::ssid string value found");
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG, "DPP: discovery::ssid",
(u8 *)token->string, os_strlen(token->string));
if (os_strlen(token->string) > SSID_MAX_LEN) {
dpp_auth_fail(auth,
"Too long discovery::ssid string value");
goto fail;
}
}
if (auth->num_conf_obj == DPP_MAX_CONF_OBJ) {
wpa_printf(MSG_DEBUG,
"DPP: No room for this many Config Objects - ignore this one");
ret = 0;
goto fail;
}
conf = &auth->conf_obj[auth->num_conf_obj++];
if (ssid64) {
conf->ssid_len = wpabuf_len(ssid64);
os_memcpy(conf->ssid, wpabuf_head(ssid64), conf->ssid_len);
} else {
conf->ssid_len = os_strlen(token->string);
os_memcpy(conf->ssid, token->string, conf->ssid_len);
}
token = json_get_member(discovery, "ssid_charset");
if (token && token->type == JSON_NUMBER) {
conf->ssid_charset = token->number;
wpa_printf(MSG_DEBUG, "DPP: ssid_charset=%d",
conf->ssid_charset);
}
cred = json_get_member(root, "cred");
if (!cred || cred->type != JSON_OBJECT) {
dpp_auth_fail(auth, "No cred object in JSON");
goto fail;
}
token = json_get_member(cred, "akm");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No cred::akm string value found");
goto fail;
}
conf->akm = dpp_akm_from_str(token->string);
if (dpp_akm_legacy(conf->akm)) {
if (dpp_parse_cred_legacy(conf, cred) < 0)
goto fail;
} else if (dpp_akm_dpp(conf->akm)) {
if (dpp_parse_cred_dpp(auth, conf, cred) < 0)
goto fail;
} else {
wpa_printf(MSG_DEBUG, "DPP: Unsupported akm: %s",
token->string);
dpp_auth_fail(auth, "Unsupported akm");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: JSON parsing completed successfully");
ret = 0;
fail:
wpabuf_free(ssid64);
json_free(root);
return ret;
}
int dpp_conf_resp_rx(struct dpp_authentication *auth,
const uint8_t *resp, uint32_t resp_len)
{
const u8 *wrapped_data, *e_nonce, *status, *conf_obj;
u16 wrapped_data_len, e_nonce_len, status_len, conf_obj_len;
const u8 *addr[1];
size_t len[1];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
int ret = -1;
auth->conf_resp_status = 255;
if (dpp_check_attrs(resp, resp_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in config response");
return -1;
}
wrapped_data = dpp_get_attr(resp, resp_len,
DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid required Wrapped Data attribute");
return -1;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
return -1;
addr[0] = resp;
len[0] = wrapped_data - 4 - resp;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]);
if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
1, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_ENROLLEE_NONCE,
&e_nonce_len);
if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth,
"Missing or invalid Enrollee Nonce attribute");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
if (os_memcmp(e_nonce, auth->e_nonce, e_nonce_len) != 0) {
dpp_auth_fail(auth, "Enrollee Nonce mismatch");
goto fail;
}
status = dpp_get_attr(resp, resp_len,
DPP_ATTR_STATUS, &status_len);
if (!status || status_len < 1) {
dpp_auth_fail(auth,
"Missing or invalid required DPP Status attribute");
goto fail;
}
auth->conf_resp_status = status[0];
wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
if (status[0] != DPP_STATUS_OK) {
dpp_auth_fail(auth, "Configurator rejected configuration");
goto fail;
}
conf_obj = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_CONFIG_OBJ,
&conf_obj_len);
if (!conf_obj) {
dpp_auth_fail(auth,
"Missing required Configuration Object attribute");
goto fail;
}
while (conf_obj) {
wpa_hexdump_ascii(MSG_DEBUG, "DPP: configurationObject JSON",
(u8 *)conf_obj, conf_obj_len);
if (dpp_parse_conf_obj(auth, conf_obj, conf_obj_len) < 0)
goto fail;
conf_obj = dpp_get_attr_next(conf_obj, unwrapped, unwrapped_len,
DPP_ATTR_CONFIG_OBJ,
&conf_obj_len);
}
ret = 0;
fail:
os_free(unwrapped);
return ret;
}
void dpp_configurator_free(struct dpp_configurator *conf)
{
if (!conf)
return;
crypto_ec_key_deinit(conf->csign);
os_free(conf->kid);
os_free(conf);
}
int dpp_configurator_get_key(const struct dpp_configurator *conf, char *buf,
size_t buflen)
{
int keylen, ret = -1;
unsigned char *key = NULL;
if (!conf->csign)
return ret;
crypto_ec_get_priv_key_der(conf->csign, &key, &keylen);
if (keylen > 0)
ret = wpa_snprintf_hex(buf, buflen, key, keylen);
crypto_free_buffer(key);
return ret;
}
struct dpp_configurator *
dpp_keygen_configurator(const char *curve, u8 *privkey,
size_t privkey_len)
{
struct dpp_configurator *conf;
struct wpabuf *csign_pub = NULL;
u8 kid_hash[SHA256_MAC_LEN];
const u8 *addr[1];
size_t len[1];
conf = os_zalloc(sizeof(*conf));
if (!conf)
return NULL;
if (!curve) {
conf->curve = &dpp_curves[0];
} else {
conf->curve = dpp_get_curve_name(curve);
if (!conf->curve) {
wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s",
curve);
os_free(conf);
return NULL;
}
}
if (privkey)
conf->csign = dpp_set_keypair(&conf->curve, privkey,
privkey_len);
else
conf->csign = dpp_gen_keypair(conf->curve);
if (!conf->csign)
goto fail;
conf->own = 1;
csign_pub = dpp_get_pubkey_point(conf->csign, 1);
if (!csign_pub) {
wpa_printf(MSG_INFO, "DPP: Failed to extract C-sign-key");
goto fail;
}
/* kid = SHA256(ANSI X9.63 uncompressed C-sign-key) */
addr[0] = wpabuf_head(csign_pub);
len[0] = wpabuf_len(csign_pub);
if (sha256_vector(1, addr, len, kid_hash) < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to derive kid for C-sign-key");
goto fail;
}
conf->kid = base64_url_encode(kid_hash, sizeof(kid_hash), NULL);
if (!conf->kid)
goto fail;
out:
wpabuf_free(csign_pub);
return conf;
fail:
dpp_configurator_free(conf);
conf = NULL;
goto out;
}
int dpp_configurator_own_config(struct dpp_authentication *auth,
const char *curve, int ap)
{
struct wpabuf *conf_obj;
int ret = -1;
if (!auth->conf) {
wpa_printf(MSG_DEBUG, "DPP: No configurator specified");
return -1;
}
if (!curve) {
auth->curve = &dpp_curves[0];
} else {
auth->curve = dpp_get_curve_name(curve);
if (!auth->curve) {
wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s",
curve);
return -1;
}
}
wpa_printf(MSG_DEBUG,
"DPP: Building own configuration/connector with curve %s",
auth->curve->name);
auth->own_protocol_key = dpp_gen_keypair(auth->curve);
if (!auth->own_protocol_key)
return -1;
dpp_copy_netaccesskey(auth, &auth->conf_obj[0]);
auth->peer_protocol_key = auth->own_protocol_key;
dpp_copy_csign(&auth->conf_obj[0], auth->conf->csign);
conf_obj = dpp_build_conf_obj(auth, ap, 0);
if (!conf_obj) {
wpabuf_free(auth->conf_obj[0].c_sign_key);
auth->conf_obj[0].c_sign_key = NULL;
goto fail;
}
ret = dpp_parse_conf_obj(auth, wpabuf_head(conf_obj),
wpabuf_len(conf_obj));
fail:
wpabuf_free(conf_obj);
auth->peer_protocol_key = NULL;
return ret;
}
static int dpp_compatible_netrole(const char *role1, const char *role2)
{
return (os_strcmp(role1, "sta") == 0 && os_strcmp(role2, "ap") == 0) ||
(os_strcmp(role1, "ap") == 0 && os_strcmp(role2, "sta") == 0);
}
static int dpp_connector_compatible_group(struct json_token *root,
const char *group_id,
const char *net_role)
{
struct json_token *groups, *token;
groups = json_get_member(root, "groups");
if (!groups || groups->type != JSON_ARRAY)
return 0;
for (token = groups->child; token; token = token->sibling) {
struct json_token *id, *role;
id = json_get_member(token, "groupId");
if (!id || id->type != JSON_STRING)
continue;
role = json_get_member(token, "netRole");
if (!role || role->type != JSON_STRING)
continue;
if (os_strcmp(id->string, "*") != 0 &&
os_strcmp(group_id, "*") != 0 &&
os_strcmp(id->string, group_id) != 0)
continue;
if (dpp_compatible_netrole(role->string, net_role))
return 1;
}
return 0;
}
static int dpp_connector_match_groups(struct json_token *own_root,
struct json_token *peer_root)
{
struct json_token *groups, *token;
groups = json_get_member(peer_root, "groups");
if (!groups || groups->type != JSON_ARRAY) {
wpa_printf(MSG_DEBUG, "DPP: No peer groups array found");
return 0;
}
for (token = groups->child; token; token = token->sibling) {
struct json_token *id, *role;
id = json_get_member(token, "groupId");
if (!id || id->type != JSON_STRING) {
wpa_printf(MSG_DEBUG,
"DPP: Missing peer groupId string");
continue;
}
role = json_get_member(token, "netRole");
if (!role || role->type != JSON_STRING) {
wpa_printf(MSG_DEBUG,
"DPP: Missing peer groups::netRole string");
continue;
}
wpa_printf(MSG_DEBUG,
"DPP: peer connector group: groupId='%s' netRole='%s'",
id->string, role->string);
if (dpp_connector_compatible_group(own_root, id->string,
role->string)) {
wpa_printf(MSG_DEBUG,
"DPP: Compatible group/netRole in own connector");
return 1;
}
}
return 0;
}
struct json_token * dpp_parse_own_connector(const char *own_connector)
{
unsigned char *own_conn;
size_t own_conn_len;
const char *pos, *end;
struct json_token *own_root;
pos = os_strchr(own_connector, '.');
if (!pos) {
wpa_printf(MSG_DEBUG, "DPP: Own connector is missing the firstdot (.)");
return NULL;
}
pos++;
end = os_strchr(pos, '.');
if (!end) {
wpa_printf(MSG_DEBUG, "DPP: Own connector is missing second dot (.)");
return NULL;
}
own_conn = base64_url_decode(pos, end - pos, &own_conn_len);
if (!own_conn) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to base64url decode own signedConnectior JWS Payload");
return NULL;
}
own_root = json_parse((const char *) own_conn, own_conn_len);
os_free(own_conn);
if (!own_root)
wpa_printf(MSG_DEBUG, "DPP: Failed to parse local connector");
return own_root;
}
enum dpp_status_error
dpp_peer_intro(struct dpp_introduction *intro, const char *own_connector,
const u8 *net_access_key, size_t net_access_key_len,
const u8 *csign_key, size_t csign_key_len,
const u8 *peer_connector, size_t peer_connector_len,
os_time_t *expiry)
{
struct json_token *root = NULL, *netkey, *token;
struct json_token *own_root = NULL;
enum dpp_status_error ret = 255, res;
struct crypto_ec_key *own_key = NULL, *peer_key = NULL;
struct wpabuf *own_key_pub = NULL;
const struct dpp_curve_params *curve, *own_curve;
struct dpp_signed_connector_info info;
size_t Nx_len;
u8 Nx[DPP_MAX_SHARED_SECRET_LEN];
os_memset(intro, 0, sizeof(*intro));
os_memset(&info, 0, sizeof(info));
if (expiry)
*expiry = 0;
own_key = dpp_set_keypair(&own_curve, net_access_key,
net_access_key_len);
if (!own_key) {
wpa_printf(MSG_ERROR, "DPP: Failed to parse own netAccessKey");
goto fail;
}
own_root = dpp_parse_own_connector(own_connector);
if (!own_root) {
goto fail;
}
res = dpp_check_signed_connector(&info, csign_key, csign_key_len,
peer_connector, peer_connector_len);
if (res != DPP_STATUS_OK) {
ret = res;
goto fail;
}
root = json_parse((const char *) info.payload, info.payload_len);
if (!root) {
wpa_printf(MSG_DEBUG, "DPP: JSON parsing of connector failed");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
if (!dpp_connector_match_groups(own_root, root)) {
wpa_printf(MSG_DEBUG,
"DPP: Peer connector does not include compatible group netrole with own connector");
ret = DPP_STATUS_NO_MATCH;
goto fail;
}
token = json_get_member(root, "expiry");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG,
"DPP: No expiry string found - connector does not expire");
} else {
wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string);
if (dpp_key_expired(token->string, expiry)) {
wpa_printf(MSG_DEBUG,
"DPP: Connector (netAccessKey) has expired");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
}
netkey = json_get_member(root, "netAccessKey");
if (!netkey || netkey->type != JSON_OBJECT) {
wpa_printf(MSG_DEBUG, "DPP: No netAccessKey object found");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
peer_key = dpp_parse_jwk(netkey, &curve);
if (!peer_key) {
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
dpp_debug_print_key("DPP: Received netAccessKey", peer_key);
if (own_curve != curve) {
wpa_printf(MSG_DEBUG,
"DPP: Mismatching netAccessKey curves (%s != %s)",
own_curve->name, curve->name);
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
/* ECDH: N = nk * PK */
if (dpp_ecdh(own_key, peer_key, Nx, &Nx_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)",
Nx, Nx_len);
/* PMK = HKDF(<>, "DPP PMK", N.x) */
if (dpp_derive_pmk(Nx, Nx_len, intro->pmk, curve->hash_len) < 0) {
wpa_printf(MSG_ERROR, "DPP: Failed to derive PMK");
goto fail;
}
intro->pmk_len = curve->hash_len;
/* PMKID = Truncate-128(H(min(NK.x, PK.x) | max(NK.x, PK.x))) */
if (dpp_derive_pmkid(curve, own_key, peer_key, intro->pmkid) < 0) {
wpa_printf(MSG_ERROR, "DPP: Failed to derive PMKID");
goto fail;
}
ret = DPP_STATUS_OK;
fail:
if (ret != DPP_STATUS_OK)
os_memset(intro, 0, sizeof(*intro));
forced_memzero(Nx, sizeof(Nx));
os_free(info.payload);
crypto_ec_key_deinit(own_key);
wpabuf_free(own_key_pub);
crypto_ec_key_deinit(peer_key);
json_free(root);
json_free(own_root);
return ret;
}
static unsigned int dpp_next_id(struct dpp_global *dpp)
{
struct dpp_bootstrap_info *bi;
unsigned int max_id = 0;
dl_list_for_each(bi, &dpp->bootstrap, struct dpp_bootstrap_info, list) {
if (bi->id > max_id)
max_id = bi->id;
}
return max_id + 1;
}
static int dpp_bootstrap_del(struct dpp_global *dpp, unsigned int id)
{
struct dpp_bootstrap_info *bi, *tmp;
int found = 0;
if (!dpp)
return -1;
dl_list_for_each_safe(bi, tmp, &dpp->bootstrap,
struct dpp_bootstrap_info, list) {
if (id && bi->id != id)
continue;
found = 1;
dl_list_del(&bi->list);
dpp_bootstrap_info_free(bi);
}
if (id == 0)
return 0; /* flush succeeds regardless of entries found */
return found ? 0 : -1;
}
struct dpp_bootstrap_info * dpp_add_qr_code(struct dpp_global *dpp,
const char *uri)
{
struct dpp_bootstrap_info *bi;
if (!dpp)
return NULL;
bi = dpp_parse_uri(uri);
if (!bi)
return NULL;
bi->type = DPP_BOOTSTRAP_QR_CODE;
bi->id = dpp_next_id(dpp);
dl_list_add(&dpp->bootstrap, &bi->list);
return bi;
}
struct dpp_bootstrap_info * dpp_add_nfc_uri(struct dpp_global *dpp,
const char *uri)
{
struct dpp_bootstrap_info *bi;
if (!dpp)
return NULL;
bi = dpp_parse_uri(uri);
if (!bi)
return NULL;
bi->type = DPP_BOOTSTRAP_NFC_URI;
bi->id = dpp_next_id(dpp);
dl_list_add(&dpp->bootstrap, &bi->list);
return bi;
}
int dpp_bootstrap_gen(struct dpp_global *dpp, const char *cmd)
{
char *mac = NULL, *info = NULL, *curve = NULL;
char *key = NULL;
u8 *privkey = NULL;
size_t privkey_len = 0;
int ret = -1;
struct dpp_bootstrap_info *bi;
if (!dpp)
return -1;
bi = os_zalloc(sizeof(*bi));
if (!bi)
goto fail;
if (os_strstr(cmd, "type=qrcode"))
bi->type = DPP_BOOTSTRAP_QR_CODE;
else if (os_strstr(cmd, "type=pkex"))
bi->type = DPP_BOOTSTRAP_PKEX;
else if (os_strstr(cmd, "type=nfc-uri"))
bi->type = DPP_BOOTSTRAP_NFC_URI;
else
goto fail;
bi->chan = get_param(cmd, " chan=");
mac = get_param(cmd, " mac=");
info = get_param(cmd, " info=");
curve = get_param(cmd, " curve=");
key = get_param(cmd, " key=");
if (key) {
privkey_len = os_strlen(key) / 2;
privkey = os_malloc(privkey_len);
if (!privkey ||
hexstr2bin(key, privkey, privkey_len) < 0)
goto fail;
}
wpa_hexdump(MSG_DEBUG, "private key", privkey, privkey_len);
if (dpp_keygen(bi, curve, privkey, privkey_len) < 0 ||
dpp_parse_uri_chan_list(bi, bi->chan) < 0 ||
dpp_parse_uri_mac(bi, mac) < 0 ||
dpp_parse_uri_info(bi, info) < 0 ||
dpp_gen_uri(bi) < 0)
goto fail;
bi->id = dpp_next_id(dpp);
dl_list_add(&dpp->bootstrap, &bi->list);
ret = bi->id;
bi = NULL;
fail:
os_free(curve);
os_free(mac);
os_free(info);
str_clear_free(key);
bin_clear_free(privkey, privkey_len);
dpp_bootstrap_info_free(bi);
return ret;
}
struct dpp_bootstrap_info *
dpp_bootstrap_get_id(struct dpp_global *dpp, unsigned int id)
{
struct dpp_bootstrap_info *bi;
if (!dpp)
return NULL;
dl_list_for_each(bi, &dpp->bootstrap, struct dpp_bootstrap_info, list) {
if (bi->id == id)
return bi;
}
return NULL;
}
int dpp_bootstrap_remove(struct dpp_global *dpp, const char *id)
{
unsigned int id_val;
if (os_strcmp(id, "*") == 0) {
id_val = 0;
} else {
id_val = atoi(id);
if (id_val == 0)
return -1;
}
return dpp_bootstrap_del(dpp, id_val);
}
const char * dpp_bootstrap_get_uri(struct dpp_global *dpp, unsigned int id)
{
struct dpp_bootstrap_info *bi;
bi = dpp_bootstrap_get_id(dpp, id);
if (!bi)
return NULL;
return bi->uri;
}
int dpp_get_bootstrap_info(struct dpp_global *dpp, int id,
char *reply, int reply_size)
{
struct dpp_bootstrap_info *bi;
char pkhash[2 * SHA256_MAC_LEN + 1];
bi = dpp_bootstrap_get_id(dpp, id);
if (!bi)
return -1;
wpa_snprintf_hex(pkhash, sizeof(pkhash), bi->pubkey_hash,
SHA256_MAC_LEN);
return os_snprintf(reply, reply_size, "type=%s\n"
"mac_addr=" MACSTR "\n"
"info=%s\n"
"num_freq=%u\n"
"curve=%s\n"
"pkhash=%s\n",
dpp_bootstrap_type_txt(bi->type),
MAC2STR(bi->mac_addr),
bi->info ? bi->info : "",
bi->num_freq,
bi->curve->name,
pkhash);
}
void dpp_bootstrap_find_pair(struct dpp_global *dpp, const u8 *i_bootstrap,
const u8 *r_bootstrap,
struct dpp_bootstrap_info **own_bi,
struct dpp_bootstrap_info **peer_bi)
{
struct dpp_bootstrap_info *bi;
*own_bi = NULL;
*peer_bi = NULL;
if (!dpp)
return;
dl_list_for_each(bi, &dpp->bootstrap, struct dpp_bootstrap_info, list) {
if (!*own_bi && bi->own &&
os_memcmp(bi->pubkey_hash, r_bootstrap,
SHA256_MAC_LEN) == 0) {
wpa_printf(MSG_DEBUG,
"DPP: Found matching own bootstrapping information");
*own_bi = bi;
}
if (!*peer_bi && !bi->own &&
os_memcmp(bi->pubkey_hash, i_bootstrap,
SHA256_MAC_LEN) == 0) {
wpa_printf(MSG_DEBUG,
"DPP: Found matching peer bootstrapping information");
*peer_bi = bi;
}
if (*own_bi && *peer_bi)
break;
}
}
static unsigned int dpp_next_configurator_id(struct dpp_global *dpp)
{
struct dpp_configurator *conf;
unsigned int max_id = 0;
dl_list_for_each(conf, &dpp->configurator, struct dpp_configurator,
list) {
if (conf->id > max_id)
max_id = conf->id;
}
return max_id + 1;
}
int dpp_configurator_add(struct dpp_global *dpp, const char *cmd)
{
char *curve = NULL;
char *key = NULL;
u8 *privkey = NULL;
size_t privkey_len = 0;
int ret = -1;
struct dpp_configurator *conf = NULL;
curve = get_param(cmd, " curve=");
key = get_param(cmd, " key=");
if (key) {
privkey_len = os_strlen(key) / 2;
privkey = os_malloc(privkey_len);
if (!privkey ||
hexstr2bin(key, privkey, privkey_len) < 0)
goto fail;
}
conf = dpp_keygen_configurator(curve, privkey, privkey_len);
if (!conf)
goto fail;
conf->id = dpp_next_configurator_id(dpp);
dl_list_add(&dpp->configurator, &conf->list);
ret = conf->id;
conf = NULL;
fail:
os_free(curve);
str_clear_free(key);
bin_clear_free(privkey, privkey_len);
dpp_configurator_free(conf);
return ret;
}
static int dpp_configurator_del(struct dpp_global *dpp, unsigned int id)
{
struct dpp_configurator *conf, *tmp;
int found = 0;
if (!dpp)
return -1;
dl_list_for_each_safe(conf, tmp, &dpp->configurator,
struct dpp_configurator, list) {
if (id && conf->id != id)
continue;
found = 1;
dl_list_del(&conf->list);
dpp_configurator_free(conf);
}
if (id == 0)
return 0; /* flush succeeds regardless of entries found */
return found ? 0 : -1;
}
int dpp_configurator_remove(struct dpp_global *dpp, const char *id)
{
unsigned int id_val;
if (os_strcmp(id, "*") == 0) {
id_val = 0;
} else {
id_val = atoi(id);
if (id_val == 0)
return -1;
}
return dpp_configurator_del(dpp, id_val);
}
int dpp_configurator_get_key_id(struct dpp_global *dpp, unsigned int id,
char *buf, size_t buflen)
{
struct dpp_configurator *conf;
conf = dpp_configurator_get_id(dpp, id);
if (!conf)
return -1;
return dpp_configurator_get_key(conf, buf, buflen);
}
struct dpp_global * dpp_global_init(struct dpp_global_config *config)
{
struct dpp_global *dpp;
dpp = os_zalloc(sizeof(*dpp));
if (!dpp)
return NULL;
dpp->msg_ctx = config->msg_ctx;
dl_list_init(&dpp->bootstrap);
dl_list_init(&dpp->configurator);
return dpp;
}
void dpp_global_clear(struct dpp_global *dpp)
{
if (!dpp)
return;
dpp_bootstrap_del(dpp, 0);
dpp_configurator_del(dpp, 0);
}
void dpp_global_deinit(struct dpp_global *dpp)
{
dpp_global_clear(dpp);
os_free(dpp);
}
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