/* * WPA Supplicant - WPA state machine and EAPOL-Key processing * Copyright (c) 2003-2005, Jouni Malinen * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Alternatively, this software may be distributed under the terms of BSD * license. * * See README and COPYING for more details. */ #include #include #ifndef CONFIG_NATIVE_WINDOWS #include #endif /* CONFIG_NATIVE_WINDOWS */ #include #include "common.h" #include "md5.h" #include "sha1.h" #include "rc4.h" #include "aes_wrap.h" #include "wpa.h" #include "eloop.h" #include "wpa_supplicant.h" #include "config.h" #include "l2_packet.h" #include "eapol_sm.h" #include "preauth.h" #include "wpa_i.h" static const int WPA_SELECTOR_LEN = 4; static const u8 WPA_OUI_TYPE[] = { 0x00, 0x50, 0xf2, 1 }; static const u16 WPA_VERSION = 1; static const u8 WPA_AUTH_KEY_MGMT_NONE[] = { 0x00, 0x50, 0xf2, 0 }; static const u8 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X[] = { 0x00, 0x50, 0xf2, 1 }; static const u8 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X[] = { 0x00, 0x50, 0xf2, 2 }; static const u8 WPA_CIPHER_SUITE_NONE[] = { 0x00, 0x50, 0xf2, 0 }; static const u8 WPA_CIPHER_SUITE_WEP40[] = { 0x00, 0x50, 0xf2, 1 }; static const u8 WPA_CIPHER_SUITE_TKIP[] = { 0x00, 0x50, 0xf2, 2 }; static const u8 WPA_CIPHER_SUITE_WRAP[] = { 0x00, 0x50, 0xf2, 3 }; static const u8 WPA_CIPHER_SUITE_CCMP[] = { 0x00, 0x50, 0xf2, 4 }; static const u8 WPA_CIPHER_SUITE_WEP104[] = { 0x00, 0x50, 0xf2, 5 }; /* WPA IE version 1 * 00-50-f2:1 (OUI:OUI type) * 0x01 0x00 (version; little endian) * (all following fields are optional:) * Group Suite Selector (4 octets) (default: TKIP) * Pairwise Suite Count (2 octets, little endian) (default: 1) * Pairwise Suite List (4 * n octets) (default: TKIP) * Authenticated Key Management Suite Count (2 octets, little endian) * (default: 1) * Authenticated Key Management Suite List (4 * n octets) * (default: unspec 802.1X) * WPA Capabilities (2 octets, little endian) (default: 0) */ struct wpa_ie_hdr { u8 elem_id; u8 len; u8 oui[3]; u8 oui_type; u8 version[2]; } __attribute__ ((packed)); static const int RSN_SELECTOR_LEN = 4; static const u16 RSN_VERSION = 1; static const u8 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X[] = { 0x00, 0x0f, 0xac, 1 }; static const u8 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X[] = { 0x00, 0x0f, 0xac, 2 }; static const u8 RSN_CIPHER_SUITE_NONE[] = { 0x00, 0x0f, 0xac, 0 }; static const u8 RSN_CIPHER_SUITE_WEP40[] = { 0x00, 0x0f, 0xac, 1 }; static const u8 RSN_CIPHER_SUITE_TKIP[] = { 0x00, 0x0f, 0xac, 2 }; static const u8 RSN_CIPHER_SUITE_WRAP[] = { 0x00, 0x0f, 0xac, 3 }; static const u8 RSN_CIPHER_SUITE_CCMP[] = { 0x00, 0x0f, 0xac, 4 }; static const u8 RSN_CIPHER_SUITE_WEP104[] = { 0x00, 0x0f, 0xac, 5 }; /* EAPOL-Key Key Data Encapsulation * GroupKey and STAKey require encryption, otherwise, encryption is optional. */ static const u8 RSN_KEY_DATA_GROUPKEY[] = { 0x00, 0x0f, 0xac, 1 }; static const u8 RSN_KEY_DATA_STAKEY[] = { 0x00, 0x0f, 0xac, 2 }; static const u8 RSN_KEY_DATA_MAC_ADDR[] = { 0x00, 0x0f, 0xac, 3 }; static const u8 RSN_KEY_DATA_PMKID[] = { 0x00, 0x0f, 0xac, 4 }; /* 1/4: PMKID * 2/4: RSN IE * 3/4: one or two RSN IEs + GTK IE (encrypted) * 4/4: empty * 1/2: GTK IE (encrypted) * 2/2: empty */ /* RSN IE version 1 * 0x01 0x00 (version; little endian) * (all following fields are optional:) * Group Suite Selector (4 octets) (default: CCMP) * Pairwise Suite Count (2 octets, little endian) (default: 1) * Pairwise Suite List (4 * n octets) (default: CCMP) * Authenticated Key Management Suite Count (2 octets, little endian) * (default: 1) * Authenticated Key Management Suite List (4 * n octets) * (default: unspec 802.1X) * RSN Capabilities (2 octets, little endian) (default: 0) * PMKID Count (2 octets) (default: 0) * PMKID List (16 * n octets) */ struct rsn_ie_hdr { u8 elem_id; /* WLAN_EID_RSN */ u8 len; u8 version[2]; } __attribute__ ((packed)); struct wpa_eapol_key { u8 type; /* Note: key_info, key_length, and key_data_length are unaligned */ u8 key_info[2]; u8 key_length[2]; u8 replay_counter[WPA_REPLAY_COUNTER_LEN]; u8 key_nonce[WPA_NONCE_LEN]; u8 key_iv[16]; u8 key_rsc[8]; u8 key_id[8]; /* Reserved in IEEE 802.11i/RSN */ u8 key_mic[16]; u8 key_data_length[2]; /* followed by key_data_length bytes of key_data */ } __attribute__ ((packed)); #define WPA_KEY_INFO_TYPE_MASK (BIT(0) | BIT(1) | BIT(2)) #define WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 BIT(0) #define WPA_KEY_INFO_TYPE_HMAC_SHA1_AES BIT(1) #define WPA_KEY_INFO_KEY_TYPE BIT(3) /* 1 = Pairwise, 0 = Group key */ /* bit4..5 is used in WPA, but is reserved in IEEE 802.11i/RSN */ #define WPA_KEY_INFO_KEY_INDEX_MASK (BIT(4) | BIT(5)) #define WPA_KEY_INFO_KEY_INDEX_SHIFT 4 #define WPA_KEY_INFO_INSTALL BIT(6) /* pairwise */ #define WPA_KEY_INFO_TXRX BIT(6) /* group */ #define WPA_KEY_INFO_ACK BIT(7) #define WPA_KEY_INFO_MIC BIT(8) #define WPA_KEY_INFO_SECURE BIT(9) #define WPA_KEY_INFO_ERROR BIT(10) #define WPA_KEY_INFO_REQUEST BIT(11) #define WPA_KEY_INFO_ENCR_KEY_DATA BIT(12) /* IEEE 802.11i/RSN only */ /** * wpa_cipher_txt - Convert cipher suite to a text string * @cipher: Cipher suite (WPA_CIPHER_* enum) * Returns: Pointer to a text string of the cipher suite name */ static const char * wpa_cipher_txt(int cipher) { switch (cipher) { case WPA_CIPHER_NONE: return "NONE"; case WPA_CIPHER_WEP40: return "WEP-40"; case WPA_CIPHER_WEP104: return "WEP-104"; case WPA_CIPHER_TKIP: return "TKIP"; case WPA_CIPHER_CCMP: return "CCMP"; default: return "UNKNOWN"; } } /** * wpa_key_mgmt_txt - Convert key management suite to a text string * @key_mgmt: Key management suite (WPA_KEY_MGMT_* enum) * @proto: WPA/WPA2 version (WPA_PROTO_*) * Returns: Pointer to a text string of the key management suite name */ static const char * wpa_key_mgmt_txt(int key_mgmt, int proto) { switch (key_mgmt) { case WPA_KEY_MGMT_IEEE8021X: return proto == WPA_PROTO_RSN ? "WPA2/IEEE 802.1X/EAP" : "WPA/IEEE 802.1X/EAP"; case WPA_KEY_MGMT_PSK: return proto == WPA_PROTO_RSN ? "WPA2-PSK" : "WPA-PSK"; case WPA_KEY_MGMT_NONE: return "NONE"; case WPA_KEY_MGMT_IEEE8021X_NO_WPA: return "IEEE 802.1X (no WPA)"; default: return "UNKNOWN"; } } static int wpa_selector_to_bitfield(const u8 *s) { if (memcmp(s, WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN) == 0) return WPA_CIPHER_NONE; if (memcmp(s, WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN) == 0) return WPA_CIPHER_WEP40; if (memcmp(s, WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN) == 0) return WPA_CIPHER_TKIP; if (memcmp(s, WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN) == 0) return WPA_CIPHER_CCMP; if (memcmp(s, WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN) == 0) return WPA_CIPHER_WEP104; return 0; } static int wpa_key_mgmt_to_bitfield(const u8 *s) { if (memcmp(s, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X, WPA_SELECTOR_LEN) == 0) return WPA_KEY_MGMT_IEEE8021X; if (memcmp(s, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X, WPA_SELECTOR_LEN) == 0) return WPA_KEY_MGMT_PSK; if (memcmp(s, WPA_AUTH_KEY_MGMT_NONE, WPA_SELECTOR_LEN) == 0) return WPA_KEY_MGMT_WPA_NONE; return 0; } static int rsn_selector_to_bitfield(const u8 *s) { if (memcmp(s, RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN) == 0) return WPA_CIPHER_NONE; if (memcmp(s, RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN) == 0) return WPA_CIPHER_WEP40; if (memcmp(s, RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN) == 0) return WPA_CIPHER_TKIP; if (memcmp(s, RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN) == 0) return WPA_CIPHER_CCMP; if (memcmp(s, RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN) == 0) return WPA_CIPHER_WEP104; return 0; } static int rsn_key_mgmt_to_bitfield(const u8 *s) { if (memcmp(s, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X, RSN_SELECTOR_LEN) == 0) return WPA_KEY_MGMT_IEEE8021X; if (memcmp(s, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X, RSN_SELECTOR_LEN) == 0) return WPA_KEY_MGMT_PSK; return 0; } static int wpa_parse_wpa_ie_wpa(const u8 *wpa_ie, size_t wpa_ie_len, struct wpa_ie_data *data) { const struct wpa_ie_hdr *hdr; const u8 *pos; int left; int i, count; data->proto = WPA_PROTO_WPA; data->pairwise_cipher = WPA_CIPHER_TKIP; data->group_cipher = WPA_CIPHER_TKIP; data->key_mgmt = WPA_KEY_MGMT_IEEE8021X; data->capabilities = 0; data->pmkid = NULL; data->num_pmkid = 0; if (wpa_ie_len == 0) { /* No WPA IE - fail silently */ return -1; } if (wpa_ie_len < sizeof(struct wpa_ie_hdr)) { wpa_printf(MSG_DEBUG, "%s: ie len too short %lu", __func__, (unsigned long) wpa_ie_len); return -1; } hdr = (const struct wpa_ie_hdr *) wpa_ie; if (hdr->elem_id != GENERIC_INFO_ELEM || hdr->len != wpa_ie_len - 2 || memcmp(&hdr->oui, WPA_OUI_TYPE, WPA_SELECTOR_LEN) != 0 || WPA_GET_LE16(hdr->version) != WPA_VERSION) { wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version", __func__); return -1; } pos = (const u8 *) (hdr + 1); left = wpa_ie_len - sizeof(*hdr); if (left >= WPA_SELECTOR_LEN) { data->group_cipher = wpa_selector_to_bitfield(pos); pos += WPA_SELECTOR_LEN; left -= WPA_SELECTOR_LEN; } else if (left > 0) { wpa_printf(MSG_DEBUG, "%s: ie length mismatch, %u too much", __func__, left); return -1; } if (left >= 2) { data->pairwise_cipher = 0; count = WPA_GET_LE16(pos); pos += 2; left -= 2; if (count == 0 || left < count * WPA_SELECTOR_LEN) { wpa_printf(MSG_DEBUG, "%s: ie count botch (pairwise), " "count %u left %u", __func__, count, left); return -1; } for (i = 0; i < count; i++) { data->pairwise_cipher |= wpa_selector_to_bitfield(pos); pos += WPA_SELECTOR_LEN; left -= WPA_SELECTOR_LEN; } } else if (left == 1) { wpa_printf(MSG_DEBUG, "%s: ie too short (for key mgmt)", __func__); return -1; } if (left >= 2) { data->key_mgmt = 0; count = WPA_GET_LE16(pos); pos += 2; left -= 2; if (count == 0 || left < count * WPA_SELECTOR_LEN) { wpa_printf(MSG_DEBUG, "%s: ie count botch (key mgmt), " "count %u left %u", __func__, count, left); return -1; } for (i = 0; i < count; i++) { data->key_mgmt |= wpa_key_mgmt_to_bitfield(pos); pos += WPA_SELECTOR_LEN; left -= WPA_SELECTOR_LEN; } } else if (left == 1) { wpa_printf(MSG_DEBUG, "%s: ie too short (for capabilities)", __func__); return -1; } if (left >= 2) { data->capabilities = WPA_GET_LE16(pos); pos += 2; left -= 2; } if (left > 0) { wpa_printf(MSG_DEBUG, "%s: ie has %u trailing bytes", __func__, left); return -1; } return 0; } static int wpa_parse_wpa_ie_rsn(const u8 *rsn_ie, size_t rsn_ie_len, struct wpa_ie_data *data) { const struct rsn_ie_hdr *hdr; const u8 *pos; int left; int i, count; data->proto = WPA_PROTO_RSN; data->pairwise_cipher = WPA_CIPHER_CCMP; data->group_cipher = WPA_CIPHER_CCMP; data->key_mgmt = WPA_KEY_MGMT_IEEE8021X; data->capabilities = 0; data->pmkid = NULL; data->num_pmkid = 0; if (rsn_ie_len == 0) { /* No RSN IE - fail silently */ return -1; } if (rsn_ie_len < sizeof(struct rsn_ie_hdr)) { wpa_printf(MSG_DEBUG, "%s: ie len too short %lu", __func__, (unsigned long) rsn_ie_len); return -1; } hdr = (const struct rsn_ie_hdr *) rsn_ie; if (hdr->elem_id != RSN_INFO_ELEM || hdr->len != rsn_ie_len - 2 || WPA_GET_LE16(hdr->version) != RSN_VERSION) { wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version", __func__); return -1; } pos = (const u8 *) (hdr + 1); left = rsn_ie_len - sizeof(*hdr); if (left >= RSN_SELECTOR_LEN) { data->group_cipher = rsn_selector_to_bitfield(pos); pos += RSN_SELECTOR_LEN; left -= RSN_SELECTOR_LEN; } else if (left > 0) { wpa_printf(MSG_DEBUG, "%s: ie length mismatch, %u too much", __func__, left); return -1; } if (left >= 2) { data->pairwise_cipher = 0; count = WPA_GET_LE16(pos); pos += 2; left -= 2; if (count == 0 || left < count * RSN_SELECTOR_LEN) { wpa_printf(MSG_DEBUG, "%s: ie count botch (pairwise), " "count %u left %u", __func__, count, left); return -1; } for (i = 0; i < count; i++) { data->pairwise_cipher |= rsn_selector_to_bitfield(pos); pos += RSN_SELECTOR_LEN; left -= RSN_SELECTOR_LEN; } } else if (left == 1) { wpa_printf(MSG_DEBUG, "%s: ie too short (for key mgmt)", __func__); return -1; } if (left >= 2) { data->key_mgmt = 0; count = WPA_GET_LE16(pos); pos += 2; left -= 2; if (count == 0 || left < count * RSN_SELECTOR_LEN) { wpa_printf(MSG_DEBUG, "%s: ie count botch (key mgmt), " "count %u left %u", __func__, count, left); return -1; } for (i = 0; i < count; i++) { data->key_mgmt |= rsn_key_mgmt_to_bitfield(pos); pos += RSN_SELECTOR_LEN; left -= RSN_SELECTOR_LEN; } } else if (left == 1) { wpa_printf(MSG_DEBUG, "%s: ie too short (for capabilities)", __func__); return -1; } if (left >= 2) { data->capabilities = WPA_GET_LE16(pos); pos += 2; left -= 2; } if (left >= 2) { data->num_pmkid = WPA_GET_LE16(pos); pos += 2; left -= 2; if (left < data->num_pmkid * PMKID_LEN) { wpa_printf(MSG_DEBUG, "%s: PMKID underflow " "(num_pmkid=%d left=%d)", __func__, data->num_pmkid, left); data->num_pmkid = 0; } else { data->pmkid = pos; pos += data->num_pmkid * PMKID_LEN; left -= data->num_pmkid * PMKID_LEN; } } if (left > 0) { wpa_printf(MSG_DEBUG, "%s: ie has %u trailing bytes - ignored", __func__, left); } return 0; } /** * wpa_parse_wpa_ie - Parse WPA/RSN IE * @wpa_ie: Pointer to WPA or RSN IE * @wpa_ie_len: Length of the WPA/RSN IE * @data: Pointer to data area for parsing results * Returns: 0 on success, -1 on failure * * Parse the contents of WPA or RSN IE and write the parsed data into data. */ int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len, struct wpa_ie_data *data) { if (wpa_ie_len >= 1 && wpa_ie[0] == RSN_INFO_ELEM) return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data); else return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data); } static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len, int pairwise_cipher, int group_cipher, int key_mgmt) { u8 *pos; struct wpa_ie_hdr *hdr; if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN) return -1; hdr = (struct wpa_ie_hdr *) wpa_ie; hdr->elem_id = GENERIC_INFO_ELEM; memcpy(&hdr->oui, WPA_OUI_TYPE, WPA_SELECTOR_LEN); WPA_PUT_LE16(hdr->version, WPA_VERSION); pos = (u8 *) (hdr + 1); if (group_cipher == WPA_CIPHER_CCMP) { memcpy(pos, WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN); } else if (group_cipher == WPA_CIPHER_TKIP) { memcpy(pos, WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN); } else if (group_cipher == WPA_CIPHER_WEP104) { memcpy(pos, WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN); } else if (group_cipher == WPA_CIPHER_WEP40) { memcpy(pos, WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN); } else { wpa_printf(MSG_WARNING, "Invalid group cipher (%d).", group_cipher); return -1; } pos += WPA_SELECTOR_LEN; *pos++ = 1; *pos++ = 0; if (pairwise_cipher == WPA_CIPHER_CCMP) { memcpy(pos, WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN); } else if (pairwise_cipher == WPA_CIPHER_TKIP) { memcpy(pos, WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN); } else if (pairwise_cipher == WPA_CIPHER_NONE) { memcpy(pos, WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN); } else { wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).", pairwise_cipher); return -1; } pos += WPA_SELECTOR_LEN; *pos++ = 1; *pos++ = 0; if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) { memcpy(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X, WPA_SELECTOR_LEN); } else if (key_mgmt == WPA_KEY_MGMT_PSK) { memcpy(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X, WPA_SELECTOR_LEN); } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) { memcpy(pos, WPA_AUTH_KEY_MGMT_NONE, WPA_SELECTOR_LEN); } else { wpa_printf(MSG_WARNING, "Invalid key management type (%d).", key_mgmt); return -1; } pos += WPA_SELECTOR_LEN; /* WPA Capabilities; use defaults, so no need to include it */ hdr->len = (pos - wpa_ie) - 2; WPA_ASSERT(pos - wpa_ie <= wpa_ie_len); return pos - wpa_ie; } static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len, int pairwise_cipher, int group_cipher, int key_mgmt, struct wpa_sm *sm) { u8 *pos; struct rsn_ie_hdr *hdr; if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 + (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) return -1; hdr = (struct rsn_ie_hdr *) rsn_ie; hdr->elem_id = RSN_INFO_ELEM; WPA_PUT_LE16(hdr->version, RSN_VERSION); pos = (u8 *) (hdr + 1); if (group_cipher == WPA_CIPHER_CCMP) { memcpy(pos, RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN); } else if (group_cipher == WPA_CIPHER_TKIP) { memcpy(pos, RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN); } else if (group_cipher == WPA_CIPHER_WEP104) { memcpy(pos, RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN); } else if (group_cipher == WPA_CIPHER_WEP40) { memcpy(pos, RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN); } else { wpa_printf(MSG_WARNING, "Invalid group cipher (%d).", group_cipher); return -1; } pos += RSN_SELECTOR_LEN; *pos++ = 1; *pos++ = 0; if (pairwise_cipher == WPA_CIPHER_CCMP) { memcpy(pos, RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN); } else if (pairwise_cipher == WPA_CIPHER_TKIP) { memcpy(pos, RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN); } else if (pairwise_cipher == WPA_CIPHER_NONE) { memcpy(pos, RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN); } else { wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).", pairwise_cipher); return -1; } pos += RSN_SELECTOR_LEN; *pos++ = 1; *pos++ = 0; if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) { memcpy(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X, RSN_SELECTOR_LEN); } else if (key_mgmt == WPA_KEY_MGMT_PSK) { memcpy(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X, RSN_SELECTOR_LEN); } else { wpa_printf(MSG_WARNING, "Invalid key management type (%d).", key_mgmt); return -1; } pos += RSN_SELECTOR_LEN; /* RSN Capabilities */ *pos++ = 0; *pos++ = 0; if (sm->cur_pmksa) { /* PMKID Count (2 octets, little endian) */ *pos++ = 1; *pos++ = 0; /* PMKID */ memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN); pos += PMKID_LEN; } hdr->len = (pos - rsn_ie) - 2; WPA_ASSERT(pos - rsn_ie <= rsn_ie_len); return pos - rsn_ie; } /** * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy * @sm: Pointer to WPA state machine data from wpa_sm_init() * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE * @wpa_ie_len: Maximum length of the generated WPA/RSN IE * Returns: Length of the generated WPA/RSN IE or -1 on failure */ static int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len) { if (sm->proto == WPA_PROTO_RSN) return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len, sm->pairwise_cipher, sm->group_cipher, sm->key_mgmt, sm); else return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len, sm->pairwise_cipher, sm->group_cipher, sm->key_mgmt); } /** * wpa_pmk_to_ptk - Calculate PTK from PMK, addresses, and nonces * @pmk: Pairwise master key * @addr1: AA or SA * @addr2: SA or AA * @nonce1: ANonce or SNonce * @nonce2: SNonce or ANonce * @ptk: Buffer for pairwise transient key * @ptk_len: Length of PTK * * IEEE Std 802.11i-2004 - 8.5.1.2 Pairwise key hierarchy * PTK = PRF-X(PMK, "Pairwise key expansion", * Min(AA, SA) || Max(AA, SA) || * Min(ANonce, SNonce) || Max(ANonce, SNonce)) */ static void wpa_pmk_to_ptk(const u8 *pmk, size_t pmk_len, const u8 *addr1, const u8 *addr2, const u8 *nonce1, const u8 *nonce2, u8 *ptk, size_t ptk_len) { u8 data[2 * ETH_ALEN + 2 * 32]; if (memcmp(addr1, addr2, ETH_ALEN) < 0) { memcpy(data, addr1, ETH_ALEN); memcpy(data + ETH_ALEN, addr2, ETH_ALEN); } else { memcpy(data, addr2, ETH_ALEN); memcpy(data + ETH_ALEN, addr1, ETH_ALEN); } if (memcmp(nonce1, nonce2, 32) < 0) { memcpy(data + 2 * ETH_ALEN, nonce1, 32); memcpy(data + 2 * ETH_ALEN + 32, nonce2, 32); } else { memcpy(data + 2 * ETH_ALEN, nonce2, 32); memcpy(data + 2 * ETH_ALEN + 32, nonce1, 32); } sha1_prf(pmk, pmk_len, "Pairwise key expansion", data, sizeof(data), ptk, ptk_len); wpa_hexdump_key(MSG_DEBUG, "WPA: PMK", pmk, pmk_len); wpa_hexdump_key(MSG_DEBUG, "WPA: PTK", ptk, ptk_len); } /** * wpa_eapol_key_mic - Calculate EAPOL-Key MIC * @key: EAPOL-Key Key Confirmation Key (KCK) * @ver: Key descriptor version (WPA_KEY_INFO_TYPE_*) * @buf: Pointer to the beginning of the EAPOL header (version field) * @len: Length of the EAPOL frame (from EAPOL header to the end of the frame) * @mic: Pointer to the buffer to which the EAPOL-Key MIC is written * * Calculate EAPOL-Key MIC for an EAPOL-Key packet. The EAPOL-Key MIC field has * to be cleared (all zeroes) when calling this function. * * Note: 'IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames' has an error in the * description of the Key MIC calculation. It includes packet data from the * beginning of the EAPOL-Key header, not EAPOL header. This incorrect change * happened during final editing of the standard and the correct behavior is * defined in the last draft (IEEE 802.11i/D10). */ static void wpa_eapol_key_mic(const u8 *key, int ver, const u8 *buf, size_t len, u8 *mic) { if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) { hmac_md5(key, 16, buf, len, mic); } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { u8 hash[SHA1_MAC_LEN]; hmac_sha1(key, 16, buf, len, hash); memcpy(mic, hash, MD5_MAC_LEN); } } static void wpa_eapol_key_send(struct wpa_sm *sm, const u8 *kck, int ver, const u8 *dest, u16 proto, u8 *msg, size_t msg_len, u8 *key_mic) { if (key_mic) { wpa_eapol_key_mic(kck, ver, msg, msg_len, key_mic); } wpa_hexdump(MSG_MSGDUMP, "WPA: TX EAPOL-Key", msg, msg_len); wpa_sm_ether_send(sm, dest, proto, msg, msg_len); eapol_sm_notify_tx_eapol_key(sm->eapol); free(msg); } /** * wpa_sm_key_request - Send EAPOL-Key Request * @sm: Pointer to WPA state machine data from wpa_sm_init() * @error: Indicate whether this is an Michael MIC error report * @pairwise: 1 = error report for pairwise packet, 0 = for group packet * Returns: Pointer to the current network structure or %NULL on failure * * Send an EAPOL-Key Request to the current authenticator. This function is * used to request rekeying and it is usually called when a local Michael MIC * failure is detected. */ void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise) { size_t rlen; struct wpa_eapol_key *reply; int key_info, ver; u8 bssid[ETH_ALEN], *rbuf; if (sm->pairwise_cipher == WPA_CIPHER_CCMP) ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; else ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; if (wpa_sm_get_bssid(sm, bssid) < 0) { wpa_printf(MSG_WARNING, "Failed to read BSSID for EAPOL-Key " "request"); return; } rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, sizeof(*reply), &rlen, (void *) &reply); if (rbuf == NULL) return; reply->type = sm->proto == WPA_PROTO_RSN ? EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; key_info = WPA_KEY_INFO_REQUEST | ver; if (sm->ptk_set) key_info |= WPA_KEY_INFO_MIC; if (error) key_info |= WPA_KEY_INFO_ERROR; if (pairwise) key_info |= WPA_KEY_INFO_KEY_TYPE; WPA_PUT_BE16(reply->key_info, key_info); WPA_PUT_BE16(reply->key_length, 0); memcpy(reply->replay_counter, sm->request_counter, WPA_REPLAY_COUNTER_LEN); inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN); WPA_PUT_BE16(reply->key_data_length, 0); wpa_printf(MSG_INFO, "WPA: Sending EAPOL-Key Request (error=%d " "pairwise=%d ptk_set=%d len=%lu)", error, pairwise, sm->ptk_set, (unsigned long) rlen); wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL, rbuf, rlen, key_info & WPA_KEY_INFO_MIC ? reply->key_mic : NULL); } struct wpa_eapol_ie_parse { const u8 *wpa_ie; size_t wpa_ie_len; const u8 *rsn_ie; size_t rsn_ie_len; const u8 *pmkid; const u8 *gtk; size_t gtk_len; }; /** * wpa_supplicant_parse_generic - Parse EAPOL-Key Key Data Generic IEs * @pos: Pointer to the IE header * @end: Pointer to the end of the Key Data buffer * @ie: Pointer to parsed IE data * Returns: 0 on success, 1 if end mark is found, -1 on failure */ static int wpa_supplicant_parse_generic(const u8 *pos, const u8 *end, struct wpa_eapol_ie_parse *ie) { if (pos[1] == 0) return 1; if (pos[1] >= 6 && memcmp(pos + 2, WPA_OUI_TYPE, WPA_SELECTOR_LEN) == 0 && pos[2 + WPA_SELECTOR_LEN] == 1 && pos[2 + WPA_SELECTOR_LEN + 1] == 0) { ie->wpa_ie = pos; ie->wpa_ie_len = pos[1] + 2; return 0; } if (pos + 1 + RSN_SELECTOR_LEN < end && pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN && memcmp(pos + 2, RSN_KEY_DATA_PMKID, RSN_SELECTOR_LEN) == 0) { ie->pmkid = pos + 2 + RSN_SELECTOR_LEN; return 0; } if (pos[1] > RSN_SELECTOR_LEN + 2 && memcmp(pos + 2, RSN_KEY_DATA_GROUPKEY, RSN_SELECTOR_LEN) == 0) { ie->gtk = pos + 2 + RSN_SELECTOR_LEN; ie->gtk_len = pos[1] - RSN_SELECTOR_LEN; } return 0; } /** * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs * @buf: Pointer to the Key Data buffer * @len: Key Data Length * @ie: Pointer to parsed IE data * Returns: 0 on success, -1 on failure */ static int wpa_supplicant_parse_ies(const u8 *buf, size_t len, struct wpa_eapol_ie_parse *ie) { const u8 *pos, *end; int ret = 0; memset(ie, 0, sizeof(*ie)); for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) { if (pos + 2 + pos[1] > end) { wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data " "underflow (ie=%d len=%d)", pos[0], pos[1]); ret = -1; break; } if (*pos == RSN_INFO_ELEM) { ie->rsn_ie = pos; ie->rsn_ie_len = pos[1] + 2; } else if (*pos == GENERIC_INFO_ELEM) { ret = wpa_supplicant_parse_generic(pos, end, ie); if (ret < 0) break; if (ret > 0) { ret = 0; break; } } else { wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key " "Key Data IE", pos, 2 + pos[1]); } } return ret; } static int wpa_supplicant_get_pmk(struct wpa_sm *sm, const unsigned char *src_addr, const u8 *pmkid) { int abort_cached = 0; if (pmkid && !sm->cur_pmksa) { /* When using drivers that generate RSN IE, wpa_supplicant may * not have enough time to get the association information * event before receiving this 1/4 message, so try to find a * matching PMKSA cache entry here. */ sm->cur_pmksa = pmksa_cache_get(sm, src_addr, pmkid); if (sm->cur_pmksa) { wpa_printf(MSG_DEBUG, "RSN: found matching PMKID from " "PMKSA cache"); } else { wpa_printf(MSG_DEBUG, "RSN: no matching PMKID found"); abort_cached = 1; } } if (pmkid && sm->cur_pmksa && memcmp(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) { wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN); wpa_sm_set_pmk_from_pmksa(sm); wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache", sm->pmk, sm->pmk_len); eapol_sm_notify_cached(sm->eapol); } else if (sm->key_mgmt == WPA_KEY_MGMT_IEEE8021X && sm->eapol) { int res, pmk_len; pmk_len = PMK_LEN; res = eapol_sm_get_key(sm->eapol, sm->pmk, PMK_LEN); #ifdef EAP_LEAP if (res) { res = eapol_sm_get_key(sm->eapol, sm->pmk, 16); pmk_len = 16; } #endif /* EAP_LEAP */ if (res == 0) { wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state " "machines", sm->pmk, pmk_len); sm->pmk_len = pmk_len; pmksa_cache_add(sm, sm->pmk, pmk_len, src_addr, sm->own_addr, sm->cur_ssid); if (!sm->cur_pmksa && pmkid && pmksa_cache_get(sm, src_addr, pmkid)) { wpa_printf(MSG_DEBUG, "RSN: the new PMK " "matches with the PMKID"); abort_cached = 0; } } else { wpa_msg(sm->ctx->ctx, MSG_WARNING, "WPA: Failed to get master session key from " "EAPOL state machines"); wpa_msg(sm->ctx->ctx, MSG_WARNING, "WPA: Key handshake aborted"); if (sm->cur_pmksa) { wpa_printf(MSG_DEBUG, "RSN: Cancelled PMKSA " "caching attempt"); sm->cur_pmksa = NULL; abort_cached = 1; } else { return -1; } } } if (abort_cached && sm->key_mgmt == WPA_KEY_MGMT_IEEE8021X) { /* Send EAPOL-Start to trigger full EAP authentication. */ u8 *buf; size_t buflen; wpa_printf(MSG_DEBUG, "RSN: no PMKSA entry found - trigger " "full EAP authentication"); buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START, NULL, 0, &buflen, NULL); if (buf) { wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL, buf, buflen); free(buf); } return -1; } return 0; } static int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *src_addr, const struct wpa_eapol_key *key, int ver) { size_t rlen; struct wpa_eapol_key *reply; struct wpa_ptk *ptk; u8 buf[8], *rbuf, *wpa_ie; int wpa_ie_len; if (sm->assoc_wpa_ie == NULL) { wpa_printf(MSG_WARNING, "WPA: No assoc_wpa_ie set - cannot " "generate msg 2/4"); return -1; } wpa_ie = sm->assoc_wpa_ie; wpa_ie_len = sm->assoc_wpa_ie_len; wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len); rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, sizeof(*reply) + wpa_ie_len, &rlen, (void *) &reply); if (rbuf == NULL) return -1; reply->type = sm->proto == WPA_PROTO_RSN ? EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; WPA_PUT_BE16(reply->key_info, ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC); if (sm->proto == WPA_PROTO_RSN) WPA_PUT_BE16(reply->key_length, 0); else memcpy(reply->key_length, key->key_length, 2); memcpy(reply->replay_counter, key->replay_counter, WPA_REPLAY_COUNTER_LEN); WPA_PUT_BE16(reply->key_data_length, wpa_ie_len); memcpy(reply + 1, wpa_ie, wpa_ie_len); if (sm->renew_snonce) { if (hostapd_get_rand(sm->snonce, WPA_NONCE_LEN)) { wpa_msg(sm->ctx->ctx, MSG_WARNING, "WPA: Failed to get random data for SNonce"); free(rbuf); return -1; } sm->renew_snonce = 0; wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce", sm->snonce, WPA_NONCE_LEN); } memcpy(reply->key_nonce, sm->snonce, WPA_NONCE_LEN); /* Calculate PTK which will be stored as a temporary PTK until it has * been verified when processing message 3/4. */ ptk = &sm->tptk; wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, sm->own_addr, src_addr, sm->snonce, key->key_nonce, (u8 *) ptk, sizeof(*ptk)); /* Supplicant: swap tx/rx Mic keys */ memcpy(buf, ptk->u.auth.tx_mic_key, 8); memcpy(ptk->u.auth.tx_mic_key, ptk->u.auth.rx_mic_key, 8); memcpy(ptk->u.auth.rx_mic_key, buf, 8); sm->tptk_set = 1; wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4"); wpa_eapol_key_send(sm, ptk->kck, ver, src_addr, ETH_P_EAPOL, rbuf, rlen, reply->key_mic); return 0; } static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm, const unsigned char *src_addr, const struct wpa_eapol_key *key, u16 ver) { struct wpa_eapol_ie_parse ie; if (wpa_sm_get_ssid(sm) == NULL) { wpa_printf(MSG_WARNING, "WPA: No SSID info found (msg 1 of " "4)."); return; } wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE); wpa_printf(MSG_DEBUG, "WPA: RX message 1 of 4-Way Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver); memset(&ie, 0, sizeof(ie)); if (sm->proto == WPA_PROTO_RSN) { /* RSN: msg 1/4 should contain PMKID for the selected PMK */ const u8 *buf = (const u8 *) (key + 1); size_t len = WPA_GET_BE16(key->key_data_length); wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", buf, len); wpa_supplicant_parse_ies(buf, len, &ie); if (ie.pmkid) { wpa_hexdump(MSG_DEBUG, "RSN: PMKID from " "Authenticator", ie.pmkid, PMKID_LEN); } } if (wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid)) return; if (wpa_supplicant_send_2_of_4(sm, src_addr, key, ver)) return; memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN); } static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx) { struct wpa_sm *sm = eloop_ctx; rsn_preauth_candidate_process(sm); } static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm, const u8 *addr, int secure) { wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Key negotiation completed with " MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr), wpa_cipher_txt(sm->pairwise_cipher), wpa_cipher_txt(sm->group_cipher)); eloop_cancel_timeout(sm->ctx->scan, sm->ctx->ctx, NULL); wpa_sm_cancel_auth_timeout(sm); wpa_sm_set_state(sm, WPA_COMPLETED); if (secure) { /* MLME.SETPROTECTION.request(TA, Tx_Rx) */ eapol_sm_notify_portValid(sm->eapol, TRUE); if (sm->key_mgmt == WPA_KEY_MGMT_PSK) eapol_sm_notify_eap_success(sm->eapol, TRUE); /* * Start preauthentication after a short wait to avoid a * possible race condition between the data receive and key * configuration after the 4-Way Handshake. This increases the * likelyhood of the first preauth EAPOL-Start frame getting to * the target AP. */ eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL); } if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) { wpa_printf(MSG_DEBUG, "RSN: Authenticator accepted " "opportunistic PMKSA entry - marking it valid"); sm->cur_pmksa->opportunistic = 0; } } static int wpa_supplicant_install_ptk(struct wpa_sm *sm, const unsigned char *src_addr, const struct wpa_eapol_key *key) { int alg, keylen, rsclen; const u8 *key_rsc; u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; wpa_printf(MSG_DEBUG, "WPA: Installing PTK to the driver."); switch (sm->pairwise_cipher) { case WPA_CIPHER_CCMP: alg = WPA_ALG_CCMP; keylen = 16; rsclen = 6; break; case WPA_CIPHER_TKIP: alg = WPA_ALG_TKIP; keylen = 32; rsclen = 6; break; case WPA_CIPHER_NONE: wpa_printf(MSG_DEBUG, "WPA: Pairwise Cipher Suite: " "NONE - do not use pairwise keys"); return 0; default: wpa_printf(MSG_WARNING, "WPA: Unsupported pairwise cipher %d", sm->pairwise_cipher); return -1; } if (sm->proto == WPA_PROTO_RSN) { key_rsc = null_rsc; } else { key_rsc = key->key_rsc; wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen); } if (wpa_sm_set_key(sm, alg, src_addr, 0, 1, key_rsc, rsclen, (u8 *) &sm->ptk.tk1, keylen) < 0) { wpa_printf(MSG_WARNING, "WPA: Failed to set PTK to the " "driver."); return -1; } return 0; } static int wpa_supplicant_check_group_cipher(int group_cipher, int keylen, int maxkeylen, int *key_rsc_len, int *alg) { int ret = 0; switch (group_cipher) { case WPA_CIPHER_CCMP: if (keylen != 16 || maxkeylen < 16) { ret = -1; break; } *key_rsc_len = 6; *alg = WPA_ALG_CCMP; break; case WPA_CIPHER_TKIP: if (keylen != 32 || maxkeylen < 32) { ret = -1; break; } *key_rsc_len = 6; *alg = WPA_ALG_TKIP; break; case WPA_CIPHER_WEP104: if (keylen != 13 || maxkeylen < 13) { ret = -1; break; } *key_rsc_len = 0; *alg = WPA_ALG_WEP; break; case WPA_CIPHER_WEP40: if (keylen != 5 || maxkeylen < 5) { ret = -1; break; } *key_rsc_len = 0; *alg = WPA_ALG_WEP; break; default: wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d", group_cipher); return -1; } if (ret < 0 ) { wpa_printf(MSG_WARNING, "WPA: Unsupported %s Group Cipher key " "length %d (%d).", wpa_cipher_txt(group_cipher), keylen, maxkeylen); } return ret; } struct wpa_gtk_data { int alg, tx, key_rsc_len, keyidx; u8 gtk[32]; int gtk_len; }; static int wpa_supplicant_install_gtk(struct wpa_sm *sm, const struct wpa_gtk_data *gd, const u8 *key_rsc) { const u8 *_gtk = gd->gtk; u8 gtk_buf[32]; wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len); wpa_printf(MSG_DEBUG, "WPA: Installing GTK to the driver " "(keyidx=%d tx=%d).", gd->keyidx, gd->tx); wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len); if (sm->group_cipher == WPA_CIPHER_TKIP) { /* Swap Tx/Rx keys for Michael MIC */ memcpy(gtk_buf, gd->gtk, 16); memcpy(gtk_buf + 16, gd->gtk + 24, 8); memcpy(gtk_buf + 24, gd->gtk + 16, 8); _gtk = gtk_buf; } if (sm->pairwise_cipher == WPA_CIPHER_NONE) { if (wpa_sm_set_key(sm, gd->alg, (u8 *) "\xff\xff\xff\xff\xff\xff", gd->keyidx, 1, key_rsc, gd->key_rsc_len, _gtk, gd->gtk_len) < 0) { wpa_printf(MSG_WARNING, "WPA: Failed to set " "GTK to the driver (Group only)."); return -1; } } else if (wpa_sm_set_key(sm, gd->alg, (u8 *) "\xff\xff\xff\xff\xff\xff", gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len, _gtk, gd->gtk_len) < 0) { wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to " "the driver."); return -1; } return 0; } static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm, int tx) { if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) { /* Ignore Tx bit for GTK if a pairwise key is used. One AP * seemed to set this bit (incorrectly, since Tx is only when * doing Group Key only APs) and without this workaround, the * data connection does not work because wpa_supplicant * configured non-zero keyidx to be used for unicast. */ wpa_printf(MSG_INFO, "WPA: Tx bit set for GTK, but pairwise " "keys are used - ignore Tx bit"); return 0; } return tx; } static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm, const unsigned char *src_addr, const struct wpa_eapol_key *key, const u8 *gtk, int gtk_len, int key_info) { struct wpa_gtk_data gd; /* * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x * GTK KDE format: * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7] * Reserved [bits 0-7] * GTK */ memset(&gd, 0, sizeof(gd)); wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake", gtk, gtk_len); if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk)) return -1; gd.keyidx = gtk[0] & 0x3; gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm, !!(gtk[0] & BIT(2))); gtk += 2; gtk_len -= 2; memcpy(gd.gtk, gtk, gtk_len); gd.gtk_len = gtk_len; if (wpa_supplicant_check_group_cipher(sm->group_cipher, gtk_len, gtk_len, &gd.key_rsc_len, &gd.alg) || wpa_supplicant_install_gtk(sm, &gd, key->key_rsc)) { wpa_printf(MSG_DEBUG, "RSN: Failed to install GTK"); return -1; } wpa_supplicant_key_neg_complete(sm, src_addr, key_info & WPA_KEY_INFO_SECURE); return 0; } static void wpa_report_ie_mismatch(struct wpa_sm *sm, const char *reason, const u8 *src_addr, const u8 *wpa_ie, size_t wpa_ie_len, const u8 *rsn_ie, size_t rsn_ie_len) { wpa_msg(sm->ctx->ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")", reason, MAC2STR(src_addr)); if (sm->ap_wpa_ie) { wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp", sm->ap_wpa_ie, sm->ap_wpa_ie_len); } if (wpa_ie) { if (!sm->ap_wpa_ie) { wpa_printf(MSG_INFO, "WPA: No WPA IE in " "Beacon/ProbeResp"); } wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg", wpa_ie, wpa_ie_len); } if (sm->ap_rsn_ie) { wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp", sm->ap_rsn_ie, sm->ap_rsn_ie_len); } if (rsn_ie) { if (!sm->ap_rsn_ie) { wpa_printf(MSG_INFO, "WPA: No RSN IE in " "Beacon/ProbeResp"); } wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg", rsn_ie, rsn_ie_len); } wpa_sm_disassociate(sm, REASON_IE_IN_4WAY_DIFFERS); wpa_sm_req_scan(sm, 0, 0); } static int wpa_supplicant_validate_ie(struct wpa_sm *sm, const unsigned char *src_addr, struct wpa_eapol_ie_parse *ie) { struct wpa_ssid *ssid = sm->cur_ssid; if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) { wpa_printf(MSG_DEBUG, "WPA: No WPA/RSN IE for this AP known. " "Trying to get from scan results"); if (wpa_sm_get_beacon_ie(sm) < 0) { wpa_printf(MSG_WARNING, "WPA: Could not find AP from " "the scan results"); } else { wpa_printf(MSG_DEBUG, "WPA: Found the current AP from " "updated scan results"); } } if ((ie->wpa_ie && sm->ap_wpa_ie && (ie->wpa_ie_len != sm->ap_wpa_ie_len || memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) || (ie->rsn_ie && sm->ap_rsn_ie && (ie->rsn_ie_len != sm->ap_rsn_ie_len || memcmp(ie->rsn_ie, sm->ap_rsn_ie, ie->rsn_ie_len) != 0))) { wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match " "with IE in Beacon/ProbeResp", src_addr, ie->wpa_ie, ie->wpa_ie_len, ie->rsn_ie, ie->rsn_ie_len); return -1; } if (sm->proto == WPA_PROTO_WPA && ie->rsn_ie && sm->ap_rsn_ie == NULL && ssid && (ssid->proto & WPA_PROTO_RSN)) { wpa_report_ie_mismatch(sm, "Possible downgrade attack " "detected - RSN was enabled and RSN IE " "was in msg 3/4, but not in " "Beacon/ProbeResp", src_addr, ie->wpa_ie, ie->wpa_ie_len, ie->rsn_ie, ie->rsn_ie_len); return -1; } return 0; } static int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *src_addr, const struct wpa_eapol_key *key, u16 ver, u16 key_info) { size_t rlen; struct wpa_eapol_key *reply; u8 *rbuf; rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, sizeof(*reply), &rlen, (void *) &reply); if (rbuf == NULL) return -1; reply->type = sm->proto == WPA_PROTO_RSN ? EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; key_info &= WPA_KEY_INFO_SECURE; key_info |= ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC; WPA_PUT_BE16(reply->key_info, key_info); if (sm->proto == WPA_PROTO_RSN) WPA_PUT_BE16(reply->key_length, 0); else memcpy(reply->key_length, key->key_length, 2); memcpy(reply->replay_counter, key->replay_counter, WPA_REPLAY_COUNTER_LEN); WPA_PUT_BE16(reply->key_data_length, 0); wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4"); wpa_eapol_key_send(sm, sm->ptk.kck, ver, src_addr, ETH_P_EAPOL, rbuf, rlen, reply->key_mic); return 0; } static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm, const unsigned char *src_addr, const struct wpa_eapol_key *key, int extra_len, u16 ver) { u16 key_info, keylen, len; const u8 *pos; struct wpa_eapol_ie_parse ie; wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE); wpa_printf(MSG_DEBUG, "WPA: RX message 3 of 4-Way Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver); key_info = WPA_GET_BE16(key->key_info); pos = (const u8 *) (key + 1); len = WPA_GET_BE16(key->key_data_length); wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", pos, len); wpa_supplicant_parse_ies(pos, len, &ie); if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data"); return; } if (wpa_supplicant_validate_ie(sm, src_addr, &ie) < 0) return; if (memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) { wpa_printf(MSG_WARNING, "WPA: ANonce from message 1 of 4-Way " "Handshake differs from 3 of 4-Way Handshake - drop" " packet (src=" MACSTR ")", MAC2STR(src_addr)); return; } keylen = WPA_GET_BE16(key->key_length); switch (sm->pairwise_cipher) { case WPA_CIPHER_CCMP: if (keylen != 16) { wpa_printf(MSG_WARNING, "WPA: Invalid CCMP key length " "%d (src=" MACSTR ")", keylen, MAC2STR(src_addr)); return; } break; case WPA_CIPHER_TKIP: if (keylen != 32) { wpa_printf(MSG_WARNING, "WPA: Invalid TKIP key length " "%d (src=" MACSTR ")", keylen, MAC2STR(src_addr)); return; } break; } if (wpa_supplicant_send_4_of_4(sm, src_addr, key, ver, key_info)) return; /* SNonce was successfully used in msg 3/4, so mark it to be renewed * for the next 4-Way Handshake. If msg 3 is received again, the old * SNonce will still be used to avoid changing PTK. */ sm->renew_snonce = 1; if (key_info & WPA_KEY_INFO_INSTALL) { wpa_supplicant_install_ptk(sm, src_addr, key); } if (key_info & WPA_KEY_INFO_SECURE) { /* MLME.SETPROTECTION.request(TA, Tx_Rx) */ eapol_sm_notify_portValid(sm->eapol, TRUE); } wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE); if (ie.gtk && wpa_supplicant_pairwise_gtk(sm, src_addr, key, ie.gtk, ie.gtk_len, key_info) < 0) { wpa_printf(MSG_INFO, "RSN: Failed to configure GTK"); } } static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm, const u8 *keydata, size_t keydatalen, int key_info, struct wpa_gtk_data *gd) { int maxkeylen; struct wpa_eapol_ie_parse ie; wpa_hexdump(MSG_DEBUG, "RSN: msg 1/2 key data", keydata, keydatalen); wpa_supplicant_parse_ies(keydata, keydatalen, &ie); if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data"); return -1; } if (ie.gtk == NULL) { wpa_printf(MSG_INFO, "WPA: No GTK IE in Group Key msg 1/2"); return -1; } maxkeylen = gd->gtk_len = ie.gtk_len - 2; if (wpa_supplicant_check_group_cipher(sm->group_cipher, gd->gtk_len, maxkeylen, &gd->key_rsc_len, &gd->alg)) return -1; wpa_hexdump(MSG_DEBUG, "RSN: received GTK in group key handshake", ie.gtk, ie.gtk_len); gd->keyidx = ie.gtk[0] & 0x3; gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm, !!(ie.gtk[0] & BIT(2))); if (ie.gtk_len - 2 > sizeof(gd->gtk)) { wpa_printf(MSG_INFO, "RSN: Too long GTK in GTK IE " "(len=%lu)", (unsigned long) ie.gtk_len - 2); return -1; } memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2); return 0; } static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm, const struct wpa_eapol_key *key, size_t keydatalen, int key_info, int extra_len, u16 ver, struct wpa_gtk_data *gd) { int maxkeylen; u8 ek[32]; gd->gtk_len = WPA_GET_BE16(key->key_length); maxkeylen = keydatalen; if (keydatalen > extra_len) { wpa_printf(MSG_INFO, "WPA: Truncated EAPOL-Key packet:" " key_data_length=%lu > extra_len=%d", (unsigned long) keydatalen, extra_len); return -1; } if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) maxkeylen -= 8; if (wpa_supplicant_check_group_cipher(sm->group_cipher, gd->gtk_len, maxkeylen, &gd->key_rsc_len, &gd->alg)) return -1; gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >> WPA_KEY_INFO_KEY_INDEX_SHIFT; if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) { memcpy(ek, key->key_iv, 16); memcpy(ek + 16, sm->ptk.kek, 16); if (keydatalen > sizeof(gd->gtk)) { wpa_printf(MSG_WARNING, "WPA: RC4 key data " "too long (%lu)", (unsigned long) keydatalen); return -1; } memcpy(gd->gtk, key + 1, keydatalen); rc4_skip(ek, 32, 256, gd->gtk, keydatalen); } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { if (keydatalen % 8) { wpa_printf(MSG_WARNING, "WPA: Unsupported AES-WRAP " "len %lu", (unsigned long) keydatalen); return -1; } if (maxkeylen > sizeof(gd->gtk)) { wpa_printf(MSG_WARNING, "WPA: AES-WRAP key data " "too long (keydatalen=%lu maxkeylen=%lu)", (unsigned long) keydatalen, (unsigned long) maxkeylen); return -1; } if (aes_unwrap(sm->ptk.kek, maxkeylen / 8, (const u8 *) (key + 1), gd->gtk)) { wpa_printf(MSG_WARNING, "WPA: AES unwrap " "failed - could not decrypt GTK"); return -1; } } gd->tx = wpa_supplicant_gtk_tx_bit_workaround( sm, !!(key_info & WPA_KEY_INFO_TXRX)); return 0; } static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm, const unsigned char *src_addr, const struct wpa_eapol_key *key, int ver, u16 key_info) { size_t rlen; struct wpa_eapol_key *reply; u8 *rbuf; rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, sizeof(*reply), &rlen, (void *) &reply); if (rbuf == NULL) return -1; reply->type = sm->proto == WPA_PROTO_RSN ? EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; key_info &= WPA_KEY_INFO_KEY_INDEX_MASK; key_info |= ver | WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE; WPA_PUT_BE16(reply->key_info, key_info); if (sm->proto == WPA_PROTO_RSN) WPA_PUT_BE16(reply->key_length, 0); else memcpy(reply->key_length, key->key_length, 2); memcpy(reply->replay_counter, key->replay_counter, WPA_REPLAY_COUNTER_LEN); WPA_PUT_BE16(reply->key_data_length, 0); wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2"); wpa_eapol_key_send(sm, sm->ptk.kck, ver, src_addr, ETH_P_EAPOL, rbuf, rlen, reply->key_mic); return 0; } static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm, const unsigned char *src_addr, const struct wpa_eapol_key *key, int extra_len, u16 ver) { u16 key_info, keydatalen; int rekey; struct wpa_gtk_data gd; memset(&gd, 0, sizeof(gd)); rekey = wpa_sm_get_state(sm) == WPA_COMPLETED; wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE); wpa_printf(MSG_DEBUG, "WPA: RX message 1 of Group Key Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver); key_info = WPA_GET_BE16(key->key_info); keydatalen = WPA_GET_BE16(key->key_data_length); if (sm->proto == WPA_PROTO_RSN) { if (wpa_supplicant_process_1_of_2_rsn(sm, (const u8 *) (key + 1), keydatalen, key_info, &gd)) return; } else { if (wpa_supplicant_process_1_of_2_wpa(sm, key, keydatalen, key_info, extra_len, ver, &gd)) return; } if (wpa_supplicant_install_gtk(sm, &gd, key->key_rsc) || wpa_supplicant_send_2_of_2(sm, src_addr, key, ver, key_info)) return; if (rekey) { wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Group rekeying " "completed with " MACSTR " [GTK=%s]", MAC2STR(src_addr), wpa_cipher_txt(sm->group_cipher)); wpa_sm_set_state(sm, WPA_COMPLETED); } else { wpa_supplicant_key_neg_complete(sm, src_addr, key_info & WPA_KEY_INFO_SECURE); } } static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm, struct wpa_eapol_key *key, u16 ver, const u8 *buf, size_t len) { u8 mic[16]; int ok = 0; memcpy(mic, key->key_mic, 16); if (sm->tptk_set) { memset(key->key_mic, 0, 16); wpa_eapol_key_mic(sm->tptk.kck, ver, buf, len, key->key_mic); if (memcmp(mic, key->key_mic, 16) != 0) { wpa_printf(MSG_WARNING, "WPA: Invalid EAPOL-Key MIC " "when using TPTK - ignoring TPTK"); } else { ok = 1; sm->tptk_set = 0; sm->ptk_set = 1; memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk)); } } if (!ok && sm->ptk_set) { memset(key->key_mic, 0, 16); wpa_eapol_key_mic(sm->ptk.kck, ver, buf, len, key->key_mic); if (memcmp(mic, key->key_mic, 16) != 0) { wpa_printf(MSG_WARNING, "WPA: Invalid EAPOL-Key MIC " "- dropping packet"); return -1; } ok = 1; } if (!ok) { wpa_printf(MSG_WARNING, "WPA: Could not verify EAPOL-Key MIC " "- dropping packet"); return -1; } memcpy(sm->rx_replay_counter, key->replay_counter, WPA_REPLAY_COUNTER_LEN); sm->rx_replay_counter_set = 1; return 0; } /* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */ static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm, struct wpa_eapol_key *key, u16 ver) { u16 keydatalen = WPA_GET_BE16(key->key_data_length); wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data", (u8 *) (key + 1), keydatalen); if (!sm->ptk_set) { wpa_printf(MSG_WARNING, "WPA: PTK not available, " "cannot decrypt EAPOL-Key key data."); return -1; } /* Decrypt key data here so that this operation does not need * to be implemented separately for each message type. */ if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) { u8 ek[32]; memcpy(ek, key->key_iv, 16); memcpy(ek + 16, sm->ptk.kek, 16); rc4_skip(ek, 32, 256, (u8 *) (key + 1), keydatalen); } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { u8 *buf; if (keydatalen % 8) { wpa_printf(MSG_WARNING, "WPA: Unsupported " "AES-WRAP len %d", keydatalen); return -1; } keydatalen -= 8; /* AES-WRAP adds 8 bytes */ buf = malloc(keydatalen); if (buf == NULL) { wpa_printf(MSG_WARNING, "WPA: No memory for " "AES-UNWRAP buffer"); return -1; } if (aes_unwrap(sm->ptk.kek, keydatalen / 8, (u8 *) (key + 1), buf)) { free(buf); wpa_printf(MSG_WARNING, "WPA: AES unwrap failed - " "could not decrypt EAPOL-Key key data"); return -1; } memcpy(key + 1, buf, keydatalen); free(buf); WPA_PUT_BE16(key->key_data_length, keydatalen); } wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data", (u8 *) (key + 1), keydatalen); return 0; } /** * wpa_sm_rx_eapol - Process received WPA EAPOL frames * @sm: Pointer to WPA state machine data from wpa_sm_init() * @src_addr: Source MAC address of the EAPOL packet * @buf: Pointer to the beginning of the EAPOL data (EAPOL header) * @len: Length of the EAPOL frame * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure * * This function is called for each received EAPOL frame. Other than EAPOL-Key * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is * only processing WPA and WPA2 EAPOL-Key frames. * * The received EAPOL-Key packets are validated and valid packets are replied * to. In addition, key material (PTK, GTK) is configured at the end of a * successful key handshake. */ int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr, const u8 *buf, size_t len) { size_t plen, data_len, extra_len; struct ieee802_1x_hdr *hdr; struct wpa_eapol_key *key; u16 key_info, ver; u8 *tmp; int ret = -1; if (len < sizeof(*hdr) + sizeof(*key)) { wpa_printf(MSG_DEBUG, "WPA: EAPOL frame too short to be a WPA " "EAPOL-Key (len %lu, expecting at least %lu)", (unsigned long) len, (unsigned long) sizeof(*hdr) + sizeof(*key)); return 0; } tmp = malloc(len); if (tmp == NULL) return -1; memcpy(tmp, buf, len); hdr = (struct ieee802_1x_hdr *) tmp; key = (struct wpa_eapol_key *) (hdr + 1); plen = ntohs(hdr->length); data_len = plen + sizeof(*hdr); wpa_printf(MSG_DEBUG, "IEEE 802.1X RX: version=%d type=%d length=%lu", hdr->version, hdr->type, (unsigned long) plen); if (hdr->version < EAPOL_VERSION) { /* TODO: backwards compatibility */ } if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) { wpa_printf(MSG_DEBUG, "WPA: EAPOL frame (type %u) discarded, " "not a Key frame", hdr->type); if (sm->cur_pmksa) { wpa_printf(MSG_DEBUG, "WPA: Cancelling PMKSA caching " "attempt - attempt full EAP " "authentication"); eapol_sm_notify_pmkid_attempt(sm->eapol, 0); } ret = 0; goto out; } if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) { wpa_printf(MSG_DEBUG, "WPA: EAPOL frame payload size %lu " "invalid (frame size %lu)", (unsigned long) plen, (unsigned long) len); ret = 0; goto out; } wpa_printf(MSG_DEBUG, " EAPOL-Key type=%d", key->type); if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN) { wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key type (%d) unknown, " "discarded", key->type); ret = 0; goto out; } eapol_sm_notify_lower_layer_success(sm->eapol); wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", tmp, len); if (data_len < len) { wpa_printf(MSG_DEBUG, "WPA: ignoring %lu bytes after the IEEE " "802.1X data", (unsigned long) len - data_len); } key_info = WPA_GET_BE16(key->key_info); ver = key_info & WPA_KEY_INFO_TYPE_MASK; if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { wpa_printf(MSG_INFO, "WPA: Unsupported EAPOL-Key descriptor " "version %d.", ver); goto out; } if (sm->pairwise_cipher == WPA_CIPHER_CCMP && ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { wpa_printf(MSG_INFO, "WPA: CCMP is used, but EAPOL-Key " "descriptor version (%d) is not 2.", ver); if (sm->group_cipher != WPA_CIPHER_CCMP && !(key_info & WPA_KEY_INFO_KEY_TYPE)) { /* Earlier versions of IEEE 802.11i did not explicitly * require version 2 descriptor for all EAPOL-Key * packets, so allow group keys to use version 1 if * CCMP is not used for them. */ wpa_printf(MSG_INFO, "WPA: Backwards compatibility: " "allow invalid version for non-CCMP group " "keys"); } else goto out; } if (sm->rx_replay_counter_set && memcmp(key->replay_counter, sm->rx_replay_counter, WPA_REPLAY_COUNTER_LEN) <= 0) { wpa_printf(MSG_WARNING, "WPA: EAPOL-Key Replay Counter did not" " increase - dropping packet"); goto out; } if (!(key_info & WPA_KEY_INFO_ACK)) { wpa_printf(MSG_INFO, "WPA: No Ack bit in key_info"); goto out; } if (key_info & WPA_KEY_INFO_REQUEST) { wpa_printf(MSG_INFO, "WPA: EAPOL-Key with Request bit - " "dropped"); goto out; } if ((key_info & WPA_KEY_INFO_MIC) && wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len)) goto out; extra_len = data_len - sizeof(*hdr) - sizeof(*key); if (WPA_GET_BE16(key->key_data_length) > extra_len) { wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Invalid EAPOL-Key " "frame - key_data overflow (%d > %lu)", WPA_GET_BE16(key->key_data_length), (unsigned long) extra_len); goto out; } if (sm->proto == WPA_PROTO_RSN && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA) && wpa_supplicant_decrypt_key_data(sm, key, ver)) goto out; if (key_info & WPA_KEY_INFO_KEY_TYPE) { if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) { wpa_printf(MSG_WARNING, "WPA: Ignored EAPOL-Key " "(Pairwise) with non-zero key index"); goto out; } if (key_info & WPA_KEY_INFO_MIC) { /* 3/4 4-Way Handshake */ wpa_supplicant_process_3_of_4(sm, src_addr, key, extra_len, ver); } else { /* 1/4 4-Way Handshake */ wpa_supplicant_process_1_of_4(sm, src_addr, key, ver); } } else { if (key_info & WPA_KEY_INFO_MIC) { /* 1/2 Group Key Handshake */ wpa_supplicant_process_1_of_2(sm, src_addr, key, extra_len, ver); } else { wpa_printf(MSG_WARNING, "WPA: EAPOL-Key (Group) " "without Mic bit - dropped"); } } ret = 1; out: free(tmp); return ret; } static int wpa_cipher_bits(int cipher) { switch (cipher) { case WPA_CIPHER_CCMP: return 128; case WPA_CIPHER_TKIP: return 256; case WPA_CIPHER_WEP104: return 104; case WPA_CIPHER_WEP40: return 40; default: return 0; } } static const u8 * wpa_key_mgmt_suite(struct wpa_sm *sm) { static const u8 *dummy = (u8 *) "\x00\x00\x00\x00"; switch (sm->key_mgmt) { case WPA_KEY_MGMT_IEEE8021X: return (sm->proto == WPA_PROTO_RSN ? RSN_AUTH_KEY_MGMT_UNSPEC_802_1X : WPA_AUTH_KEY_MGMT_UNSPEC_802_1X); case WPA_KEY_MGMT_PSK: return (sm->proto == WPA_PROTO_RSN ? RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X : WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X); case WPA_KEY_MGMT_WPA_NONE: return WPA_AUTH_KEY_MGMT_NONE; default: return dummy; } } static const u8 * wpa_cipher_suite(struct wpa_sm *sm, int cipher) { static const u8 *dummy = (u8 *) "\x00\x00\x00\x00"; switch (cipher) { case WPA_CIPHER_CCMP: return (sm->proto == WPA_PROTO_RSN ? RSN_CIPHER_SUITE_CCMP : WPA_CIPHER_SUITE_CCMP); case WPA_CIPHER_TKIP: return (sm->proto == WPA_PROTO_RSN ? RSN_CIPHER_SUITE_TKIP : WPA_CIPHER_SUITE_TKIP); case WPA_CIPHER_WEP104: return (sm->proto == WPA_PROTO_RSN ? RSN_CIPHER_SUITE_WEP104 : WPA_CIPHER_SUITE_WEP104); case WPA_CIPHER_WEP40: return (sm->proto == WPA_PROTO_RSN ? RSN_CIPHER_SUITE_WEP40 : WPA_CIPHER_SUITE_WEP40); case WPA_CIPHER_NONE: return (sm->proto == WPA_PROTO_RSN ? RSN_CIPHER_SUITE_NONE : WPA_CIPHER_SUITE_NONE); default: return dummy; } } #define RSN_SUITE "%02x-%02x-%02x-%d" #define RSN_SUITE_ARG(s) (s)[0], (s)[1], (s)[2], (s)[3] /** * wpa_sm_get_mib - Dump text list of MIB entries * @sm: Pointer to WPA state machine data from wpa_sm_init() * @buf: Buffer for the list * @buflen: Length of the buffer * Returns: Number of bytes written to buffer * * This function is used fetch dot11 MIB variables. */ int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen) { int len, i; char pmkid_txt[PMKID_LEN * 2 + 1]; int rsna; if (sm->cur_pmksa) { char *pos = pmkid_txt; for (i = 0; i < PMKID_LEN; i++) { pos += sprintf(pos, "%02x", sm->cur_pmksa->pmkid[i]); } } else pmkid_txt[0] = '\0'; if ((sm->key_mgmt == WPA_KEY_MGMT_PSK || sm->key_mgmt == WPA_KEY_MGMT_IEEE8021X) && sm->proto == WPA_PROTO_RSN) rsna = 1; else rsna = 0; len = snprintf(buf, buflen, "dot11RSNAOptionImplemented=TRUE\n" "dot11RSNAPreauthenticationImplemented=TRUE\n" "dot11RSNAEnabled=%s\n" "dot11RSNAPreauthenticationEnabled=%s\n" "dot11RSNAConfigVersion=%d\n" "dot11RSNAConfigPairwiseKeysSupported=5\n" "dot11RSNAConfigGroupCipherSize=%d\n" "dot11RSNAConfigPMKLifetime=%d\n" "dot11RSNAConfigPMKReauthThreshold=%d\n" "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n" "dot11RSNAConfigSATimeout=%d\n" "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" "dot11RSNAPMKIDUsed=%s\n" "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n" "dot11RSNA4WayHandshakeFailures=%u\n", rsna ? "TRUE" : "FALSE", rsna ? "TRUE" : "FALSE", RSN_VERSION, wpa_cipher_bits(sm->group_cipher), sm->dot11RSNAConfigPMKLifetime, sm->dot11RSNAConfigPMKReauthThreshold, sm->dot11RSNAConfigSATimeout, RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)), RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->pairwise_cipher)), RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->group_cipher)), pmkid_txt, RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)), RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->pairwise_cipher)), RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->group_cipher)), sm->dot11RSNA4WayHandshakeFailures); return len; } /** * wpa_sm_init - Initialize WPA state machine * @ctx: Context pointer for callbacks * Returns: Pointer to the allocated WPA state machine data * * This function is used to allocate a new WPA state machine and the returned * value is passed to all WPA state machine calls. */ struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx) { struct wpa_sm *sm; sm = malloc(sizeof(*sm)); if (sm == NULL) return NULL; memset(sm, 0, sizeof(*sm)); sm->renew_snonce = 1; sm->ctx = ctx; sm->dot11RSNAConfigPMKLifetime = 43200; sm->dot11RSNAConfigPMKReauthThreshold = 70; sm->dot11RSNAConfigSATimeout = 60; return sm; } /** * wpa_sm_deinit - Deinitialize WPA state machine * @sm: Pointer to WPA state machine data from wpa_sm_init() */ void wpa_sm_deinit(struct wpa_sm *sm) { if (sm == NULL) return; eloop_cancel_timeout(wpa_sm_start_preauth, sm, 0); free(sm->assoc_wpa_ie); free(sm->ap_wpa_ie); free(sm->ap_rsn_ie); free(sm->ctx); free(sm); } /** * wpa_sm_notify_assoc - Notify WPA state machine about association * @sm: Pointer to WPA state machine data from wpa_sm_init() * @bssid: The BSSID of the new association * * This function is called to let WPA state machine know that the connection * was established. */ void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid) { if (sm == NULL) return; wpa_printf(MSG_DEBUG, "WPA: Association event - clear replay counter"); memcpy(sm->bssid, bssid, ETH_ALEN); memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN); sm->rx_replay_counter_set = 0; sm->renew_snonce = 1; if (memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0) rsn_preauth_deinit(sm); } /** * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation * @sm: Pointer to WPA state machine data from wpa_sm_init() * * This function is called to let WPA state machine know that the connection * was lost. This will abort any existing pre-authentication session. */ void wpa_sm_notify_disassoc(struct wpa_sm *sm) { rsn_preauth_deinit(sm); if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE) sm->dot11RSNA4WayHandshakeFailures++; } /** * wpa_sm_set_pmk - Set PMK * @sm: Pointer to WPA state machine data from wpa_sm_init() * @pmk: The new PMK * @pmk_len: The length of the new PMK in bytes * * Configure the PMK for WPA state machine. */ void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len) { if (sm == NULL) return; sm->pmk_len = pmk_len; memcpy(sm->pmk, pmk, pmk_len); } /** * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA * @sm: Pointer to WPA state machine data from wpa_sm_init() * * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK * will be cleared. */ void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm) { if (sm == NULL) return; if (sm->cur_pmksa) { sm->pmk_len = sm->cur_pmksa->pmk_len; memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len); } else { sm->pmk_len = PMK_LEN; memset(sm->pmk, 0, PMK_LEN); } } /** * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled * @sm: Pointer to WPA state machine data from wpa_sm_init() * @fast_reauth: Whether fast reauthentication (EAP) is allowed */ void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth) { if (sm) sm->fast_reauth = fast_reauth; } /** * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks * @sm: Pointer to WPA state machine data from wpa_sm_init() * @scard_ctx: Context pointer for smartcard related callback functions */ void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx) { if (sm == NULL) return; sm->scard_ctx = scard_ctx; if (sm->preauth_eapol) eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx); } /** * wpa_sm_set_config - Notification of current configration change * @sm: Pointer to WPA state machine data from wpa_sm_init() * @config: Pointer to current network configuration * * Notify WPA state machine that configuration has changed. config will be * stored as a backpointer to network configuration. This can be %NULL to clear * the stored pointed. */ void wpa_sm_set_config(struct wpa_sm *sm, struct wpa_ssid *config) { if (sm) sm->cur_ssid = config; } /** * wpa_sm_set_own_addr - Set own MAC address * @sm: Pointer to WPA state machine data from wpa_sm_init() * @addr: Own MAC address */ void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr) { if (sm) memcpy(sm->own_addr, addr, ETH_ALEN); } /** * wpa_sm_set_ifname - Set network interface name * @sm: Pointer to WPA state machine data from wpa_sm_init() * @ifname: Interface name */ void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname) { if (sm) sm->ifname = ifname; } /** * wpa_sm_set_eapol - Set EAPOL state machine pointer * @sm: Pointer to WPA state machine data from wpa_sm_init() * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init() */ void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol) { if (sm) sm->eapol = eapol; } /** * wpa_sm_set_param - Set WPA state machine parameters * @sm: Pointer to WPA state machine data from wpa_sm_init() * @param: Parameter field * @value: Parameter value * Returns: 0 on success, -1 on failure */ int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param, unsigned int value) { int ret = 0; if (sm == NULL) return -1; switch (param) { case RSNA_PMK_LIFETIME: if (value > 0) sm->dot11RSNAConfigPMKLifetime = value; else ret = -1; break; case RSNA_PMK_REAUTH_THRESHOLD: if (value > 0 && value <= 100) sm->dot11RSNAConfigPMKReauthThreshold = value; else ret = -1; break; case RSNA_SA_TIMEOUT: if (value > 0) sm->dot11RSNAConfigSATimeout = value; else ret = -1; break; case WPA_PARAM_PROTO: sm->proto = value; break; case WPA_PARAM_PAIRWISE: sm->pairwise_cipher = value; break; case WPA_PARAM_GROUP: sm->group_cipher = value; break; case WPA_PARAM_KEY_MGMT: sm->key_mgmt = value; break; } return ret; } /** * wpa_sm_get_param - Get WPA state machine parameters * @sm: Pointer to WPA state machine data from wpa_sm_init() * @param: Parameter field * Returns: Parameter value */ unsigned int wpa_sm_get_param(struct wpa_sm *sm, enum wpa_sm_conf_params param) { if (sm == NULL) return 0; switch (param) { case RSNA_PMK_LIFETIME: return sm->dot11RSNAConfigPMKLifetime; case RSNA_PMK_REAUTH_THRESHOLD: return sm->dot11RSNAConfigPMKReauthThreshold; case RSNA_SA_TIMEOUT: return sm->dot11RSNAConfigSATimeout; case WPA_PARAM_PROTO: return sm->proto; case WPA_PARAM_PAIRWISE: return sm->pairwise_cipher; case WPA_PARAM_GROUP: return sm->group_cipher; case WPA_PARAM_KEY_MGMT: return sm->key_mgmt; default: return 0; } } /** * wpa_sm_get_status - Get WPA state machine * @sm: Pointer to WPA state machine data from wpa_sm_init() * @buf: Buffer for status information * @buflen: Maximum buffer length * @verbose: Whether to include verbose status information * Returns: Number of bytes written to buf. * * Query WPA state machine for status information. This function fills in * a text area with current status information. If the buffer (buf) is not * large enough, status information will be truncated to fit the buffer. */ int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen, int verbose) { char *pos = buf, *end = buf + buflen; pos += snprintf(pos, end - pos, "pairwise_cipher=%s\n" "group_cipher=%s\n" "key_mgmt=%s\n", wpa_cipher_txt(sm->pairwise_cipher), wpa_cipher_txt(sm->group_cipher), wpa_key_mgmt_txt(sm->key_mgmt, sm->proto)); return pos - buf; } /** * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration * @sm: Pointer to WPA state machine data from wpa_sm_init() * @wpa_ie: Pointer to buffer for WPA/RSN IE * @wpa_ie_len: Pointer to the length of the wpa_ie buffer * Returns: 0 on success, -1 on failure * * Inform WPA state machine about the WPA/RSN IE used in (Re)Association * Request frame. The IE will be used to override the default value generated * with wpa_sm_set_assoc_wpa_ie_default(). */ int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie, size_t *wpa_ie_len) { if (sm == NULL) return -1; *wpa_ie_len = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len); if (*wpa_ie_len < 0) return -1; wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default", wpa_ie, *wpa_ie_len); if (sm->assoc_wpa_ie == NULL) { /* * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets * the correct version of the IE even if PMKSA caching is * aborted (which would remove PMKID from IE generation). */ sm->assoc_wpa_ie = malloc(*wpa_ie_len); if (sm->assoc_wpa_ie == NULL) return -1; memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len); sm->assoc_wpa_ie_len = *wpa_ie_len; } return 0; } /** * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq * @sm: Pointer to WPA state machine data from wpa_sm_init() * @ie: Pointer to IE data (starting from id) * @len: IE length * Returns: 0 on success, -1 on failure * * Inform WPA state machine about the WPA/RSN IE used in (Re)Association * Request frame. The IE will be used to override the default value generated * with wpa_sm_set_assoc_wpa_ie_default(). */ int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len) { if (sm == NULL) return -1; free(sm->assoc_wpa_ie); if (ie == NULL || len == 0) { wpa_printf(MSG_DEBUG, "WPA: clearing own WPA/RSN IE"); sm->assoc_wpa_ie = NULL; sm->assoc_wpa_ie_len = 0; } else { wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len); sm->assoc_wpa_ie = malloc(len); if (sm->assoc_wpa_ie == NULL) return -1; memcpy(sm->assoc_wpa_ie, ie, len); sm->assoc_wpa_ie_len = len; } return 0; } /** * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp * @sm: Pointer to WPA state machine data from wpa_sm_init() * @ie: Pointer to IE data (starting from id) * @len: IE length * Returns: 0 on success, -1 on failure * * Inform WPA state machine about the WPA IE used in Beacon / Probe Response * frame. */ int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len) { if (sm == NULL) return -1; free(sm->ap_wpa_ie); if (ie == NULL || len == 0) { wpa_printf(MSG_DEBUG, "WPA: clearing AP WPA IE"); sm->ap_wpa_ie = NULL; sm->ap_wpa_ie_len = 0; } else { wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len); sm->ap_wpa_ie = malloc(len); if (sm->ap_wpa_ie == NULL) return -1; memcpy(sm->ap_wpa_ie, ie, len); sm->ap_wpa_ie_len = len; } return 0; } /** * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp * @sm: Pointer to WPA state machine data from wpa_sm_init() * @ie: Pointer to IE data (starting from id) * @len: IE length * Returns: 0 on success, -1 on failure * * Inform WPA state machine about the RSN IE used in Beacon / Probe Response * frame. */ int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len) { if (sm == NULL) return -1; free(sm->ap_rsn_ie); if (ie == NULL || len == 0) { wpa_printf(MSG_DEBUG, "WPA: clearing AP RSN IE"); sm->ap_rsn_ie = NULL; sm->ap_rsn_ie_len = 0; } else { wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len); sm->ap_rsn_ie = malloc(len); if (sm->ap_rsn_ie == NULL) return -1; memcpy(sm->ap_rsn_ie, ie, len); sm->ap_rsn_ie_len = len; } return 0; } /** * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE * @sm: Pointer to WPA state machine data from wpa_sm_init() * @data: Pointer to data area for parsing results * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure * * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the * parsed data into data. */ int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data) { if (sm == NULL || sm->assoc_wpa_ie == NULL) { wpa_printf(MSG_DEBUG, "WPA: No WPA/RSN IE available from " "association info"); return -1; } if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data)) return -2; return 0; }