components/wpa_supplicant/src/wps/wps_attr_parse.c (ESP-IDF)

Outline

#include "includes.h"

#include "common.h"

#include "wps_defs.h"

#include "wps_attr_parse.h"

#define WPS_WORKAROUNDS

wps_set_vendor_ext_wfa_subelem(struct wps_parse_attr *, u8, u8, const u8 *)

wps_parse_vendor_ext_wfa(struct wps_parse_attr *, const u8 *, u16)

wps_parse_vendor_ext(struct wps_parse_attr *, const u8 *, u16)

wps_set_attr(struct wps_parse_attr *, u16, const u8 *, u16)

wps_parse_msg(const struct wpabuf *, struct wps_parse_attr *)

Files

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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/wpa_supplicant/src/wps/wps_attr_parse.c

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/* * Wi-Fi Protected Setup - attribute parsing * Copyright (c) 2008, 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 "wps_defs.h" #include "wps_attr_parse.h" #ifndef CONFIG_WPS_STRICT #define WPS_WORKAROUNDS #endif /* CONFIG_WPS_STRICT */ static int wps_set_vendor_ext_wfa_subelem(struct wps_parse_attr *attr, u8 id, u8 len, const u8 *pos) { wpa_printf(MSG_EXCESSIVE, "WPS: WFA subelement id=%u len=%u", id, len); switch (id) { case WFA_ELEM_VERSION2: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Version2 length " "%u", len); return -1; } attr->version2 = pos; break; case WFA_ELEM_AUTHORIZEDMACS: attr->authorized_macs = pos; attr->authorized_macs_len = len; break; case WFA_ELEM_NETWORK_KEY_SHAREABLE: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Network Key " "Shareable length %u", len); return -1; } attr->network_key_shareable = pos; break; case WFA_ELEM_REQUEST_TO_ENROLL: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Request to Enroll " "length %u", len); return -1; } attr->request_to_enroll = pos; break; case WFA_ELEM_SETTINGS_DELAY_TIME: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Settings Delay " "Time length %u", len); return -1; } attr->settings_delay_time = pos; break; case WFA_ELEM_REGISTRAR_CONFIGURATION_METHODS: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Configuration Methods length %u", len); return -1; } attr->registrar_configuration_methods = pos; break; case WFA_ELEM_MULTI_AP: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Multi-AP Extension length %u", len); return -1; } attr->multi_ap_ext = *pos; wpa_printf(MSG_DEBUG, "WPS: Multi-AP Extension 0x%02x", attr->multi_ap_ext); break; default: wpa_printf(MSG_MSGDUMP, "WPS: Skipped unknown WFA Vendor " "Extension subelement %u", id); break; } return 0; } static int wps_parse_vendor_ext_wfa(struct wps_parse_attr *attr, const u8 *pos, u16 len) { const u8 *end = pos + len; u8 id, elen; while (end - pos >= 2) { id = *pos++; elen = *pos++; if (elen > end - pos) break; if (wps_set_vendor_ext_wfa_subelem(attr, id, elen, pos) < 0) return -1; pos += elen; } return 0; } static int wps_parse_vendor_ext(struct wps_parse_attr *attr, const u8 *pos, u16 len) { u32 vendor_id; if (len < 3) { wpa_printf(MSG_DEBUG, "WPS: Skip invalid Vendor Extension"); return 0; } vendor_id = WPA_GET_BE24(pos); switch (vendor_id) { case WPS_VENDOR_ID_WFA: return wps_parse_vendor_ext_wfa(attr, pos + 3, len - 3); } /* Handle unknown vendor extensions */ wpa_printf(MSG_MSGDUMP, "WPS: Unknown Vendor Extension (Vendor ID %u)", vendor_id); if (len > WPS_MAX_VENDOR_EXT_LEN) { wpa_printf(MSG_DEBUG, "WPS: Too long Vendor Extension (%u)", len); return -1; } if (attr->num_vendor_ext >= MAX_WPS_PARSE_VENDOR_EXT) { wpa_printf(MSG_DEBUG, "WPS: Skipped Vendor Extension " "attribute (max %d vendor extensions)", MAX_WPS_PARSE_VENDOR_EXT); return -1; } attr->vendor_ext[attr->num_vendor_ext] = pos; attr->vendor_ext_len[attr->num_vendor_ext] = len; attr->num_vendor_ext++; return 0; } static int wps_set_attr(struct wps_parse_attr *attr, u16 type, const u8 *pos, u16 len) { switch (type) { case ATTR_VERSION: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Version length %u", len); return -1; } attr->version = pos; break; case ATTR_MSG_TYPE: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type " "length %u", len); return -1; } attr->msg_type = pos; break; case ATTR_ENROLLEE_NONCE: if (len != WPS_NONCE_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce " "length %u", len); return -1; } attr->enrollee_nonce = pos; break; case ATTR_REGISTRAR_NONCE: if (len != WPS_NONCE_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce " "length %u", len); return -1; } attr->registrar_nonce = pos; break; case ATTR_UUID_E: if (len != WPS_UUID_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid UUID-E length %u", len); return -1; } attr->uuid_e = pos; break; case ATTR_UUID_R: if (len != WPS_UUID_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid UUID-R length %u", len); return -1; } attr->uuid_r = pos; break; case ATTR_AUTH_TYPE_FLAGS: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid Authentication " "Type Flags length %u", len); return -1; } attr->auth_type_flags = pos; break; case ATTR_ENCR_TYPE_FLAGS: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid Encryption Type " "Flags length %u", len); return -1; } attr->encr_type_flags = pos; break; case ATTR_CONN_TYPE_FLAGS: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Connection Type " "Flags length %u", len); return -1; } attr->conn_type_flags = pos; break; case ATTR_CONFIG_METHODS: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid Config Methods " "length %u", len); return -1; } attr->config_methods = pos; break; case ATTR_SELECTED_REGISTRAR_CONFIG_METHODS: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid Selected " "Registrar Config Methods length %u", len); return -1; } attr->sel_reg_config_methods = pos; break; case ATTR_PRIMARY_DEV_TYPE: if (len != WPS_DEV_TYPE_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid Primary Device " "Type length %u", len); return -1; } attr->primary_dev_type = pos; break; case ATTR_RF_BANDS: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid RF Bands length " "%u", len); return -1; } attr->rf_bands = pos; break; case ATTR_ASSOC_STATE: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid Association State " "length %u", len); return -1; } attr->assoc_state = pos; break; case ATTR_CONFIG_ERROR: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid Configuration " "Error length %u", len); return -1; } attr->config_error = pos; break; case ATTR_DEV_PASSWORD_ID: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid Device Password " "ID length %u", len); return -1; } attr->dev_password_id = pos; break; case ATTR_OOB_DEVICE_PASSWORD: if (len < WPS_OOB_PUBKEY_HASH_LEN + 2 || len > WPS_OOB_PUBKEY_HASH_LEN + 2 + WPS_OOB_DEVICE_PASSWORD_LEN || (len < WPS_OOB_PUBKEY_HASH_LEN + 2 + WPS_OOB_DEVICE_PASSWORD_MIN_LEN && WPA_GET_BE16(pos + WPS_OOB_PUBKEY_HASH_LEN) != DEV_PW_NFC_CONNECTION_HANDOVER)) { wpa_printf(MSG_DEBUG, "WPS: Invalid OOB Device " "Password length %u", len); return -1; } attr->oob_dev_password = pos; attr->oob_dev_password_len = len; break; case ATTR_OS_VERSION: if (len != 4) { wpa_printf(MSG_DEBUG, "WPS: Invalid OS Version length " "%u", len); return -1; } attr->os_version = pos; break; case ATTR_WPS_STATE: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Wi-Fi Protected " "Setup State length %u", len); return -1; } attr->wps_state = pos; break; case ATTR_AUTHENTICATOR: if (len != WPS_AUTHENTICATOR_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid Authenticator " "length %u", len); return -1; } attr->authenticator = pos; break; case ATTR_R_HASH1: if (len != WPS_HASH_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid R-Hash1 length %u", len); return -1; } attr->r_hash1 = pos; break; case ATTR_R_HASH2: if (len != WPS_HASH_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid R-Hash2 length %u", len); return -1; } attr->r_hash2 = pos; break; case ATTR_E_HASH1: if (len != WPS_HASH_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid E-Hash1 length %u", len); return -1; } attr->e_hash1 = pos; break; case ATTR_E_HASH2: if (len != WPS_HASH_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid E-Hash2 length %u", len); return -1; } attr->e_hash2 = pos; break; case ATTR_R_SNONCE1: if (len != WPS_SECRET_NONCE_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid R-SNonce1 length " "%u", len); return -1; } attr->r_snonce1 = pos; break; case ATTR_R_SNONCE2: if (len != WPS_SECRET_NONCE_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid R-SNonce2 length " "%u", len); return -1; } attr->r_snonce2 = pos; break; case ATTR_E_SNONCE1: if (len != WPS_SECRET_NONCE_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid E-SNonce1 length " "%u", len); return -1; } attr->e_snonce1 = pos; break; case ATTR_E_SNONCE2: if (len != WPS_SECRET_NONCE_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid E-SNonce2 length " "%u", len); return -1; } attr->e_snonce2 = pos; break; case ATTR_KEY_WRAP_AUTH: if (len != WPS_KWA_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid Key Wrap " "Authenticator length %u", len); return -1; } attr->key_wrap_auth = pos; break; case ATTR_AUTH_TYPE: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid Authentication " "Type length %u", len); return -1; } attr->auth_type = pos; break; case ATTR_ENCR_TYPE: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid Encryption " "Type length %u", len); return -1; } attr->encr_type = pos; break; case ATTR_NETWORK_INDEX: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Network Index " "length %u", len); return -1; } attr->network_idx = pos; break; case ATTR_NETWORK_KEY_INDEX: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Network Key Index " "length %u", len); return -1; } attr->network_key_idx = pos; break; case ATTR_MAC_ADDR: if (len != ETH_ALEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid MAC Address " "length %u", len); return -1; } attr->mac_addr = pos; break; case ATTR_SELECTED_REGISTRAR: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Selected Registrar" " length %u", len); return -1; } attr->selected_registrar = pos; break; case ATTR_REQUEST_TYPE: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Request Type " "length %u", len); return -1; } attr->request_type = pos; break; case ATTR_RESPONSE_TYPE: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid Response Type " "length %u", len); return -1; } attr->response_type = pos; break; case ATTR_MANUFACTURER: attr->manufacturer = pos; if (len > WPS_MANUFACTURER_MAX_LEN) attr->manufacturer_len = WPS_MANUFACTURER_MAX_LEN; else attr->manufacturer_len = len; break; case ATTR_MODEL_NAME: attr->model_name = pos; if (len > WPS_MODEL_NAME_MAX_LEN) attr->model_name_len = WPS_MODEL_NAME_MAX_LEN; else attr->model_name_len = len; break; case ATTR_MODEL_NUMBER: attr->model_number = pos; if (len > WPS_MODEL_NUMBER_MAX_LEN) attr->model_number_len = WPS_MODEL_NUMBER_MAX_LEN; else attr->model_number_len = len; break; case ATTR_SERIAL_NUMBER: attr->serial_number = pos; if (len > WPS_SERIAL_NUMBER_MAX_LEN) attr->serial_number_len = WPS_SERIAL_NUMBER_MAX_LEN; else attr->serial_number_len = len; break; case ATTR_DEV_NAME: if (len > WPS_DEV_NAME_MAX_LEN) { wpa_printf(MSG_DEBUG, "WPS: Ignore too long Device Name (len=%u)", len); break; } attr->dev_name = pos; attr->dev_name_len = len; break; case ATTR_PUBLIC_KEY: /* * The Public Key attribute is supposed to be exactly 192 bytes * in length. Allow couple of bytes shorter one to try to * interoperate with implementations that do not use proper * zero-padding. */ if (len < 190 || len > 192) { wpa_printf(MSG_DEBUG, "WPS: Ignore Public Key with unexpected length %u", len); break; } attr->public_key = pos; attr->public_key_len = len; break; case ATTR_ENCR_SETTINGS: attr->encr_settings = pos; attr->encr_settings_len = len; break; case ATTR_CRED: if (attr->num_cred >= MAX_CRED_COUNT) { wpa_printf(MSG_DEBUG, "WPS: Skipped Credential " "attribute (max %d credentials)", MAX_CRED_COUNT); break; } attr->cred[attr->num_cred] = pos; attr->cred_len[attr->num_cred] = len; attr->num_cred++; break; case ATTR_SSID: if (len > SSID_MAX_LEN) { wpa_printf(MSG_DEBUG, "WPS: Ignore too long SSID (len=%u)", len); break; } attr->ssid = pos; attr->ssid_len = len; break; case ATTR_NETWORK_KEY: attr->network_key = pos; attr->network_key_len = len; break; case ATTR_AP_SETUP_LOCKED: if (len != 1) { wpa_printf(MSG_DEBUG, "WPS: Invalid AP Setup Locked " "length %u", len); return -1; } attr->ap_setup_locked = pos; break; case ATTR_REQUESTED_DEV_TYPE: if (len != WPS_DEV_TYPE_LEN) { wpa_printf(MSG_DEBUG, "WPS: Invalid Requested Device " "Type length %u", len); return -1; } if (attr->num_req_dev_type >= MAX_REQ_DEV_TYPE_COUNT) { wpa_printf(MSG_DEBUG, "WPS: Skipped Requested Device " "Type attribute (max %u types)", MAX_REQ_DEV_TYPE_COUNT); break; } attr->req_dev_type[attr->num_req_dev_type] = pos; attr->num_req_dev_type++; break; case ATTR_SECONDARY_DEV_TYPE_LIST: if (len > WPS_SEC_DEV_TYPE_MAX_LEN || (len % WPS_DEV_TYPE_LEN) > 0) { wpa_printf(MSG_DEBUG, "WPS: Invalid Secondary Device " "Type length %u", len); return -1; } attr->sec_dev_type_list = pos; attr->sec_dev_type_list_len = len; break; case ATTR_VENDOR_EXT: if (wps_parse_vendor_ext(attr, pos, len) < 0) return -1; break; case ATTR_AP_CHANNEL: if (len != 2) { wpa_printf(MSG_DEBUG, "WPS: Invalid AP Channel " "length %u", len); return -1; } attr->ap_channel = pos; break; default: wpa_printf(MSG_DEBUG, "WPS: Unsupported attribute type 0x%x " "len=%u", type, len); break; } return 0; } int wps_parse_msg(const struct wpabuf *msg, struct wps_parse_attr *attr) { const u8 *pos, *end; u16 type, len; #ifdef WPS_WORKAROUNDS u16 prev_type = 0; #endif /* WPS_WORKAROUNDS */ os_memset(attr, 0, sizeof(*attr)); pos = wpabuf_head(msg); end = pos + wpabuf_len(msg); while (pos < end) { if (end - pos < 4) { wpa_printf(MSG_DEBUG, "WPS: Invalid message - " "%lu bytes remaining", (unsigned long) (end - pos)); return -1; } type = WPA_GET_BE16(pos); pos += 2; len = WPA_GET_BE16(pos); pos += 2; wpa_printf(MSG_EXCESSIVE, "WPS: attr type=0x%x len=%u", type, len); if (len > end - pos) { wpa_printf(MSG_DEBUG, "WPS: Attribute overflow"); wpa_hexdump_buf(MSG_MSGDUMP, "WPS: Message data", msg); #ifdef WPS_WORKAROUNDS /* * Some deployed APs seem to have a bug in encoding of * Network Key attribute in the Credential attribute * where they add an extra octet after the Network Key * attribute at least when open network is being * provisioned. */ if ((type & 0xff00) != 0x1000 && prev_type == ATTR_NETWORK_KEY) { wpa_printf(MSG_DEBUG, "WPS: Workaround - try " "to skip unexpected octet after " "Network Key"); pos -= 3; continue; } #endif /* WPS_WORKAROUNDS */ return -1; } #ifdef WPS_WORKAROUNDS if (type == 0 && len == 0) { /* * Mac OS X 10.6 seems to be adding 0x00 padding to the * end of M1. Skip those to avoid interop issues. */ int i; for (i = 0; i < end - pos; i++) { if (pos[i]) break; } if (i == end - pos) { wpa_printf(MSG_DEBUG, "WPS: Workaround - skip " "unexpected message padding"); break; } } #endif /* WPS_WORKAROUNDS */ if (wps_set_attr(attr, type, pos, len) < 0) return -1; #ifdef WPS_WORKAROUNDS prev_type = type; #endif /* WPS_WORKAROUNDS */ pos += len; } return 0; }

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