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/*
* TLS v1.0/v1.1/v1.2 client (RFC 2246, RFC 4346, RFC 5246)
* Copyright (c) 2006-2019, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/sha1.h"
#include "crypto/tls.h"
#include "x509v3.h"
#include "tlsv1_common.h"
#include "tlsv1_record.h"
#include "tlsv1_client.h"
#include "tlsv1_client_i.h"
/* TODO:
* Support for a message fragmented across several records (RFC 2246, 6.2.1)
*/
void tls_alert(struct tlsv1_client *conn, u8 level, u8 description)
{
conn->alert_level = level;
conn->alert_description = description;
}
void tlsv1_client_free_dh(struct tlsv1_client *conn)
{
os_free(conn->dh_p);
os_free(conn->dh_g);
os_free(conn->dh_ys);
conn->dh_p = conn->dh_g = conn->dh_ys = NULL;
}
u16 tls_client_highest_ver(struct tlsv1_client *conn)
{
u16 tls_version = TLS_VERSION;
/* Pick the highest locally enabled TLS version */
#ifdef CONFIG_TLSV12
if ((conn->flags & TLS_CONN_DISABLE_TLSv1_2) &&
tls_version == TLS_VERSION_1_2)
tls_version = TLS_VERSION_1_1;
#endif /* CONFIG_TLSV12 */
#ifdef CONFIG_TLSV11
if ((conn->flags & TLS_CONN_DISABLE_TLSv1_1) &&
tls_version == TLS_VERSION_1_1)
tls_version = TLS_VERSION_1;
#endif /* CONFIG_TLSV11 */
if ((conn->flags & TLS_CONN_DISABLE_TLSv1_0) &&
tls_version == TLS_VERSION_1)
return 0;
return tls_version;
}
int tls_derive_pre_master_secret(struct tlsv1_client *conn,
u8 *pre_master_secret)
{
WPA_PUT_BE16(pre_master_secret, tls_client_highest_ver(conn));
if (os_get_random(pre_master_secret + 2,
TLS_PRE_MASTER_SECRET_LEN - 2))
return -1;
return 0;
}
int tls_derive_keys(struct tlsv1_client *conn,
const u8 *pre_master_secret, size_t pre_master_secret_len)
{
u8 seed[2 * TLS_RANDOM_LEN];
u8 key_block[TLS_MAX_KEY_BLOCK_LEN];
u8 *pos;
size_t key_block_len;
if (pre_master_secret) {
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret",
pre_master_secret, pre_master_secret_len);
os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
TLS_RANDOM_LEN);
if (tls_prf(conn->rl.tls_version,
pre_master_secret, pre_master_secret_len,
"master secret", seed, 2 * TLS_RANDOM_LEN,
conn->master_secret, TLS_MASTER_SECRET_LEN)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive "
"master_secret");
return -1;
}
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret",
conn->master_secret, TLS_MASTER_SECRET_LEN);
}
os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len);
if (conn->rl.tls_version == TLS_VERSION_1)
key_block_len += 2 * conn->rl.iv_size;
if (tls_prf(conn->rl.tls_version,
conn->master_secret, TLS_MASTER_SECRET_LEN,
"key expansion", seed, 2 * TLS_RANDOM_LEN,
key_block, key_block_len)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block");
return -1;
}
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block",
key_block, key_block_len);
pos = key_block;
/* client_write_MAC_secret */
os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size);
pos += conn->rl.hash_size;
/* server_write_MAC_secret */
os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size);
pos += conn->rl.hash_size;
/* client_write_key */
os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len);
pos += conn->rl.key_material_len;
/* server_write_key */
os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
pos += conn->rl.key_material_len;
if (conn->rl.tls_version == TLS_VERSION_1) {
/* client_write_IV */
os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
pos += conn->rl.iv_size;
/* server_write_IV */
os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size);
} else {
/*
* Use IV field to set the mask value for TLS v1.1. A fixed
* mask of zero is used per the RFC 4346, 6.2.3.2 CBC Block
* Cipher option 2a.
*/
os_memset(conn->rl.write_iv, 0, conn->rl.iv_size);
}
return 0;
}
/**
* tlsv1_client_handshake - Process TLS handshake
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @in_data: Input data from TLS peer
* @in_len: Input data length
* @out_len: Length of the output buffer.
* @appl_data: Pointer to application data pointer, or %NULL if dropped
* @appl_data_len: Pointer to variable that is set to appl_data length
* @need_more_data: Set to 1 if more data would be needed to complete
* processing
* Returns: Pointer to output data, %NULL on failure
*/
u8 * tlsv1_client_handshake(struct tlsv1_client *conn,
const u8 *in_data, size_t in_len,
size_t *out_len, u8 **appl_data,
size_t *appl_data_len, int *need_more_data)
{
const u8 *pos, *end;
u8 *msg = NULL, *in_msg = NULL, *in_pos, *in_end, alert, ct;
size_t in_msg_len;
int no_appl_data;
int used;
if (need_more_data)
*need_more_data = 0;
if (conn->state == CLIENT_HELLO) {
if (in_len)
return NULL;
return tls_send_client_hello(conn, out_len);
}
if (conn->partial_input) {
if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
"memory for pending record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
goto failed;
}
wpabuf_put_data(conn->partial_input, in_data, in_len);
in_data = wpabuf_head(conn->partial_input);
in_len = wpabuf_len(conn->partial_input);
}
if (in_data == NULL || in_len == 0)
return NULL;
pos = in_data;
end = in_data + in_len;
in_msg = os_malloc(in_len);
if (in_msg == NULL)
return NULL;
/* Each received packet may include multiple records */
while (pos < end) {
in_msg_len = in_len;
used = tlsv1_record_receive(&conn->rl, pos, end - pos,
in_msg, &in_msg_len, &alert);
if (used < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
"record failed");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
goto failed;
}
if (used == 0) {
struct wpabuf *partial;
wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
partial = wpabuf_alloc_copy(pos, end - pos);
wpabuf_free(conn->partial_input);
conn->partial_input = partial;
if (conn->partial_input == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
"allocate memory for pending "
"record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
goto failed;
}
os_free(in_msg);
if (need_more_data)
*need_more_data = 1;
return NULL;
}
ct = pos[0];
in_pos = in_msg;
in_end = in_msg + in_msg_len;
/* Each received record may include multiple messages of the
* same ContentType. */
while (in_pos < in_end) {
in_msg_len = in_end - in_pos;
if (tlsv1_client_process_handshake(conn, ct, in_pos,
&in_msg_len,
appl_data,
appl_data_len) < 0)
goto failed;
in_pos += in_msg_len;
}
pos += used;
}
os_free(in_msg);
in_msg = NULL;
no_appl_data = appl_data == NULL || *appl_data == NULL;
msg = tlsv1_client_handshake_write(conn, out_len, no_appl_data);
failed:
os_free(in_msg);
if (conn->alert_level) {
wpabuf_free(conn->partial_input);
conn->partial_input = NULL;
conn->state = FAILED;
os_free(msg);
msg = tlsv1_client_send_alert(conn, conn->alert_level,
conn->alert_description,
out_len);
} else if (msg == NULL) {
msg = os_zalloc(1);
*out_len = 0;
}
if (need_more_data == NULL || !(*need_more_data)) {
wpabuf_free(conn->partial_input);
conn->partial_input = NULL;
}
return msg;
}
/**
* tlsv1_client_encrypt - Encrypt data into TLS tunnel
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @in_data: Pointer to plaintext data to be encrypted
* @in_len: Input buffer length
* @out_data: Pointer to output buffer (encrypted TLS data)
* @out_len: Maximum out_data length
* Returns: Number of bytes written to out_data, -1 on failure
*
* This function is used after TLS handshake has been completed successfully to
* send data in the encrypted tunnel.
*/
int tlsv1_client_encrypt(struct tlsv1_client *conn,
const u8 *in_data, size_t in_len,
u8 *out_data, size_t out_len)
{
size_t rlen;
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Plaintext AppData",
in_data, in_len);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA,
out_data, out_len, in_data, in_len, &rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
return rlen;
}
/**
* tlsv1_client_decrypt - Decrypt data from TLS tunnel
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @in_data: Pointer to input buffer (encrypted TLS data)
* @in_len: Input buffer length
* @need_more_data: Set to 1 if more data would be needed to complete
* processing
* Returns: Decrypted data or %NULL on failure
*
* This function is used after TLS handshake has been completed successfully to
* receive data from the encrypted tunnel.
*/
struct wpabuf * tlsv1_client_decrypt(struct tlsv1_client *conn,
const u8 *in_data, size_t in_len,
int *need_more_data)
{
const u8 *in_end, *pos;
int used;
u8 alert, *out_pos, ct;
size_t olen;
struct wpabuf *buf = NULL;
if (need_more_data)
*need_more_data = 0;
if (conn->partial_input) {
if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
"memory for pending record");
alert = TLS_ALERT_INTERNAL_ERROR;
goto fail;
}
wpabuf_put_data(conn->partial_input, in_data, in_len);
in_data = wpabuf_head(conn->partial_input);
in_len = wpabuf_len(conn->partial_input);
}
pos = in_data;
in_end = in_data + in_len;
while (pos < in_end) {
ct = pos[0];
if (wpabuf_resize(&buf, in_end - pos) < 0) {
alert = TLS_ALERT_INTERNAL_ERROR;
goto fail;
}
out_pos = wpabuf_put(buf, 0);
olen = wpabuf_tailroom(buf);
used = tlsv1_record_receive(&conn->rl, pos, in_end - pos,
out_pos, &olen, &alert);
if (used < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing "
"failed");
goto fail;
}
if (used == 0) {
struct wpabuf *partial;
wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
partial = wpabuf_alloc_copy(pos, in_end - pos);
wpabuf_free(conn->partial_input);
conn->partial_input = partial;
if (conn->partial_input == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
"allocate memory for pending "
"record");
alert = TLS_ALERT_INTERNAL_ERROR;
goto fail;
}
if (need_more_data)
*need_more_data = 1;
return buf;
}
if (ct == TLS_CONTENT_TYPE_ALERT) {
if (olen < 2) {
wpa_printf(MSG_DEBUG, "TLSv1: Alert "
"underflow");
alert = TLS_ALERT_DECODE_ERROR;
goto fail;
}
wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
out_pos[0], out_pos[1]);
if (out_pos[0] == TLS_ALERT_LEVEL_WARNING) {
/* Continue processing */
pos += used;
continue;
}
alert = out_pos[1];
goto fail;
}
if (ct != TLS_CONTENT_TYPE_APPLICATION_DATA) {
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type "
"0x%x when decrypting application data",
pos[0]);
alert = TLS_ALERT_UNEXPECTED_MESSAGE;
goto fail;
}
wpabuf_put(buf, olen);
pos += used;
}
wpabuf_free(conn->partial_input);
conn->partial_input = NULL;
return buf;
fail:
wpabuf_free(buf);
wpabuf_free(conn->partial_input);
conn->partial_input = NULL;
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
return NULL;
}
/**
* tlsv1_client_global_init - Initialize TLSv1 client
* Returns: 0 on success, -1 on failure
*
* This function must be called before using any other TLSv1 client functions.
*/
int tlsv1_client_global_init(void)
{
return crypto_global_init();
}
/**
* tlsv1_client_global_deinit - Deinitialize TLSv1 client
*
* This function can be used to deinitialize the TLSv1 client that was
* initialized by calling tlsv1_client_global_init(). No TLSv1 client functions
* can be called after this before calling tlsv1_client_global_init() again.
*/
void tlsv1_client_global_deinit(void)
{
crypto_global_deinit();
}
/**
* tlsv1_client_init - Initialize TLSv1 client connection
* Returns: Pointer to TLSv1 client connection data or %NULL on failure
*/
struct tlsv1_client * tlsv1_client_init(void)
{
struct tlsv1_client *conn;
size_t count;
u16 *suites;
conn = os_zalloc(sizeof(*conn));
if (conn == NULL)
return NULL;
conn->state = CLIENT_HELLO;
if (tls_verify_hash_init(&conn->verify) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify "
"hash");
os_free(conn);
return NULL;
}
count = 0;
suites = conn->cipher_suites;
#ifdef CONFIG_CRYPTO_MBEDTLS
suites[count++] = TLS_DHE_RSA_WITH_AES_256_CBC_SHA256;
#endif
suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA256;
#ifdef CONFIG_CRYPTO_MBEDTLS
suites[count++] = TLS_DHE_RSA_WITH_AES_256_CBC_SHA;
#endif
suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
#ifdef CONFIG_CRYPTO_MBEDTLS
suites[count++] = TLS_DHE_RSA_WITH_AES_128_CBC_SHA256;
#endif
suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
#ifdef CONFIG_CRYPTO_MBEDTLS
suites[count++] = TLS_DHE_RSA_WITH_AES_128_CBC_SHA;
#endif
suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
#ifdef CONFIG_CRYPTO_MBEDTLS
suites[count++] = TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA;
#endif
suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
conn->num_cipher_suites = count;
conn->rl.tls_version = TLS_VERSION;
return conn;
}
/**
* tlsv1_client_deinit - Deinitialize TLSv1 client connection
* @conn: TLSv1 client connection data from tlsv1_client_init()
*/
void tlsv1_client_deinit(struct tlsv1_client *conn)
{
crypto_public_key_free(conn->server_rsa_key);
tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
tlsv1_record_change_write_cipher(&conn->rl);
tlsv1_record_change_read_cipher(&conn->rl);
tls_verify_hash_free(&conn->verify);
os_free(conn->client_hello_ext);
tlsv1_client_free_dh(conn);
tlsv1_cred_free(conn->cred);
wpabuf_free(conn->partial_input);
x509_certificate_chain_free(conn->server_cert);
os_free(conn);
}
/**
* tlsv1_client_established - Check whether connection has been established
* @conn: TLSv1 client connection data from tlsv1_client_init()
* Returns: 1 if connection is established, 0 if not
*/
int tlsv1_client_established(struct tlsv1_client *conn)
{
return conn->state == ESTABLISHED;
}
/**
* tlsv1_client_prf - Use TLS-PRF to derive keying material
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @label: Label (e.g., description of the key) for PRF
* @context: Optional extra upper-layer context (max len 2^16)
* @context_len: The length of the context value
* @server_random_first: seed is 0 = client_random|server_random,
* 1 = server_random|client_random
* @out: Buffer for output data from TLS-PRF
* @out_len: Length of the output buffer
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
const u8 *context, size_t context_len,
int server_random_first, u8 *out, size_t out_len)
{
u8 *seed, *pos;
size_t seed_len = 2 * TLS_RANDOM_LEN;
int res;
if (conn->state != ESTABLISHED)
return -1;
if (context_len > 65535)
return -1;
if (context)
seed_len += 2 + context_len;
seed = os_malloc(seed_len);
if (!seed)
return -1;
if (server_random_first) {
os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
TLS_RANDOM_LEN);
} else {
os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
TLS_RANDOM_LEN);
}
if (context) {
pos = seed + 2 * TLS_RANDOM_LEN;
WPA_PUT_BE16(pos, context_len);
pos += 2;
os_memcpy(pos, context, context_len);
}
res = tls_prf(conn->rl.tls_version,
conn->master_secret, TLS_MASTER_SECRET_LEN,
label, seed, seed_len, out, out_len);
os_free(seed);
return res;
}
/**
* tlsv1_client_get_cipher - Get current cipher name
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @buf: Buffer for the cipher name
* @buflen: buf size
* Returns: 0 on success, -1 on failure
*
* Get the name of the currently used cipher.
*/
int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
size_t buflen)
{
char *cipher;
switch (conn->rl.cipher_suite) {
case TLS_RSA_WITH_RC4_128_MD5:
cipher = "RC4-MD5";
break;
case TLS_RSA_WITH_RC4_128_SHA:
cipher = "RC4-SHA";
break;
case TLS_RSA_WITH_DES_CBC_SHA:
cipher = "DES-CBC-SHA";
break;
case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
cipher = "DES-CBC3-SHA";
break;
case TLS_DHE_RSA_WITH_DES_CBC_SHA:
cipher = "DHE-RSA-DES-CBC-SHA";
break;
case TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA:
cipher = "DHE-RSA-DES-CBC3-SHA";
break;
case TLS_DH_anon_WITH_RC4_128_MD5:
cipher = "ADH-RC4-MD5";
break;
case TLS_DH_anon_WITH_DES_CBC_SHA:
cipher = "ADH-DES-SHA";
break;
case TLS_DH_anon_WITH_3DES_EDE_CBC_SHA:
cipher = "ADH-DES-CBC3-SHA";
break;
case TLS_RSA_WITH_AES_128_CBC_SHA:
cipher = "AES-128-SHA";
break;
case TLS_DHE_RSA_WITH_AES_128_CBC_SHA:
cipher = "DHE-RSA-AES-128-SHA";
break;
case TLS_DH_anon_WITH_AES_128_CBC_SHA:
cipher = "ADH-AES-128-SHA";
break;
case TLS_RSA_WITH_AES_256_CBC_SHA:
cipher = "AES-256-SHA";
break;
case TLS_DHE_RSA_WITH_AES_256_CBC_SHA:
cipher = "DHE-RSA-AES-256-SHA";
break;
case TLS_DH_anon_WITH_AES_256_CBC_SHA:
cipher = "ADH-AES-256-SHA";
break;
case TLS_RSA_WITH_AES_128_CBC_SHA256:
cipher = "AES-128-SHA256";
break;
case TLS_RSA_WITH_AES_256_CBC_SHA256:
cipher = "AES-256-SHA256";
break;
case TLS_DHE_RSA_WITH_AES_128_CBC_SHA256:
cipher = "DHE-RSA-AES-128-SHA256";
break;
case TLS_DHE_RSA_WITH_AES_256_CBC_SHA256:
cipher = "DHE-RSA-AES-256-SHA256";
break;
case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
cipher = "ADH-AES-128-SHA256";
break;
case TLS_DH_anon_WITH_AES_256_CBC_SHA256:
cipher = "ADH-AES-256-SHA256";
break;
default:
return -1;
}
if (os_strlcpy(buf, cipher, buflen) >= buflen)
return -1;
return 0;
}
/**
* tlsv1_client_shutdown - Shutdown TLS connection
* @conn: TLSv1 client connection data from tlsv1_client_init()
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_shutdown(struct tlsv1_client *conn)
{
conn->state = CLIENT_HELLO;
if (tls_verify_hash_init(&conn->verify) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
"hash");
return -1;
}
tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
tlsv1_record_change_write_cipher(&conn->rl);
tlsv1_record_change_read_cipher(&conn->rl);
conn->certificate_requested = 0;
crypto_public_key_free(conn->server_rsa_key);
conn->server_rsa_key = NULL;
conn->session_resumed = 0;
return 0;
}
/**
* tlsv1_client_resumed - Was session resumption used
* @conn: TLSv1 client connection data from tlsv1_client_init()
* Returns: 1 if current session used session resumption, 0 if not
*/
int tlsv1_client_resumed(struct tlsv1_client *conn)
{
return !!conn->session_resumed;
}
/**
* tlsv1_client_hello_ext - Set TLS extension for ClientHello
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @ext_type: Extension type
* @data: Extension payload (%NULL to remove extension)
* @data_len: Extension payload length
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
const u8 *data, size_t data_len)
{
u8 *pos;
conn->session_ticket_included = 0;
os_free(conn->client_hello_ext);
conn->client_hello_ext = NULL;
conn->client_hello_ext_len = 0;
if (data == NULL || data_len == 0)
return 0;
pos = conn->client_hello_ext = os_malloc(4 + data_len);
if (pos == NULL)
return -1;
WPA_PUT_BE16(pos, ext_type);
pos += 2;
WPA_PUT_BE16(pos, data_len);
pos += 2;
os_memcpy(pos, data, data_len);
conn->client_hello_ext_len = 4 + data_len;
if (ext_type == TLS_EXT_PAC_OPAQUE) {
conn->session_ticket_included = 1;
wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
}
return 0;
}
/**
* tlsv1_client_get_random - Get random data from TLS connection
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @keys: Structure of random data (filled on success)
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_get_random(struct tlsv1_client *conn, struct tls_random *keys)
{
os_memset(keys, 0, sizeof(*keys));
if (conn->state == CLIENT_HELLO)
return -1;
keys->client_random = conn->client_random;
keys->client_random_len = TLS_RANDOM_LEN;
if (conn->state != SERVER_HELLO) {
keys->server_random = conn->server_random;
keys->server_random_len = TLS_RANDOM_LEN;
}
return 0;
}
/**
* tlsv1_client_get_keyblock_size - Get TLS key_block size
* @conn: TLSv1 client connection data from tlsv1_client_init()
* Returns: Size of the key_block for the negotiated cipher suite or -1 on
* failure
*/
int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
{
if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
return -1;
return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
conn->rl.iv_size);
}
/**
* tlsv1_client_set_cipher_list - Configure acceptable cipher suites
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
* (TLS_CIPHER_*).
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
{
size_t count;
u16 *suites;
/* TODO: implement proper configuration of cipher suites */
if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
count = 0;
suites = conn->cipher_suites;
suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
/*
* Cisco AP (at least 350 and 1200 series) local authentication
* server does not know how to search cipher suites from the
* list and seem to require that the last entry in the list is
* the one that it wants to use. However, TLS specification
* requires the list to be in the client preference order. As a
* workaround, add anon-DH AES-128-SHA1 again at the end of the
* list to allow the Cisco code to find it.
*/
suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
conn->num_cipher_suites = count;
}
return 0;
}
/**
* tlsv1_client_set_cred - Set client credentials
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @cred: Credentials from tlsv1_cred_alloc()
* Returns: 0 on success, -1 on failure
*
* On success, the client takes ownership of the credentials block and caller
* must not free it. On failure, caller is responsible for freeing the
* credential block.
*/
int tlsv1_client_set_cred(struct tlsv1_client *conn,
struct tlsv1_credentials *cred)
{
tlsv1_cred_free(conn->cred);
conn->cred = cred;
return 0;
}
/**
* tlsv1_client_set_flags - Set connection flags
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @flags: TLS_CONN_* bitfield
*/
void tlsv1_client_set_flags(struct tlsv1_client *conn, unsigned int flags)
{
conn->flags = flags;
conn->rl.tls_version = tls_client_highest_ver(conn);
}
void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
tlsv1_client_session_ticket_cb cb,
void *ctx)
{
wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
cb, ctx);
conn->session_ticket_cb = cb;
conn->session_ticket_cb_ctx = ctx;
}
void tlsv1_client_set_cb(struct tlsv1_client *conn,
void (*event_cb)(void *ctx, enum tls_event ev,
union tls_event_data *data),
void *cb_ctx,
int cert_in_cb)
{
conn->event_cb = event_cb;
conn->cb_ctx = cb_ctx;
conn->cert_in_cb = !!cert_in_cb;
}
int tlsv1_client_get_version(struct tlsv1_client *conn, char *buf,
size_t buflen)
{
if (!conn)
return -1;
switch (conn->rl.tls_version) {
case TLS_VERSION_1:
os_strlcpy(buf, "TLSv1", buflen);
break;
case TLS_VERSION_1_1:
os_strlcpy(buf, "TLSv1.1", buflen);
break;
case TLS_VERSION_1_2:
os_strlcpy(buf, "TLSv1.2", buflen);
break;
default:
return -1;
}
return 0;
}
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