| /* |
| * WPA/RSN - Shared functions for supplicant and authenticator |
| * Copyright (c) 2002-2008, Jouni Malinen <j@w1.fi> |
| * |
| * 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 "includes.h" |
| |
| #include "common.h" |
| #include "crypto/md5.h" |
| #include "crypto/sha1.h" |
| #include "crypto/sha256.h" |
| #include "crypto/aes_wrap.h" |
| #include "crypto/crypto.h" |
| #include "ieee802_11_defs.h" |
| #include "defs.h" |
| #include "wpa_common.h" |
| |
| |
| /** |
| * 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 |
| * Returns: 0 on success, -1 on failure |
| * |
| * 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). |
| */ |
| int wpa_eapol_key_mic(const u8 *key, int ver, const u8 *buf, size_t len, |
| u8 *mic) |
| { |
| u8 hash[SHA1_MAC_LEN]; |
| |
| switch (ver) { |
| case WPA_KEY_INFO_TYPE_HMAC_MD5_RC4: |
| return hmac_md5(key, 16, buf, len, mic); |
| case WPA_KEY_INFO_TYPE_HMAC_SHA1_AES: |
| if (hmac_sha1(key, 16, buf, len, hash)) |
| return -1; |
| os_memcpy(mic, hash, MD5_MAC_LEN); |
| break; |
| #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W) |
| case WPA_KEY_INFO_TYPE_AES_128_CMAC: |
| return omac1_aes_128(key, buf, len, mic); |
| #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */ |
| default: |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| |
| /** |
| * wpa_pmk_to_ptk - Calculate PTK from PMK, addresses, and nonces |
| * @pmk: Pairwise master key |
| * @pmk_len: Length of PMK |
| * @label: Label to use in derivation |
| * @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 |
| * @use_sha256: Whether to use SHA256-based KDF |
| * |
| * 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)) |
| * |
| * STK = PRF-X(SMK, "Peer key expansion", |
| * Min(MAC_I, MAC_P) || Max(MAC_I, MAC_P) || |
| * Min(INonce, PNonce) || Max(INonce, PNonce)) |
| */ |
| void wpa_pmk_to_ptk(const u8 *pmk, size_t pmk_len, const char *label, |
| const u8 *addr1, const u8 *addr2, |
| const u8 *nonce1, const u8 *nonce2, |
| u8 *ptk, size_t ptk_len, int use_sha256) |
| { |
| u8 data[2 * ETH_ALEN + 2 * WPA_NONCE_LEN]; |
| |
| if (os_memcmp(addr1, addr2, ETH_ALEN) < 0) { |
| os_memcpy(data, addr1, ETH_ALEN); |
| os_memcpy(data + ETH_ALEN, addr2, ETH_ALEN); |
| } else { |
| os_memcpy(data, addr2, ETH_ALEN); |
| os_memcpy(data + ETH_ALEN, addr1, ETH_ALEN); |
| } |
| |
| if (os_memcmp(nonce1, nonce2, WPA_NONCE_LEN) < 0) { |
| os_memcpy(data + 2 * ETH_ALEN, nonce1, WPA_NONCE_LEN); |
| os_memcpy(data + 2 * ETH_ALEN + WPA_NONCE_LEN, nonce2, |
| WPA_NONCE_LEN); |
| } else { |
| os_memcpy(data + 2 * ETH_ALEN, nonce2, WPA_NONCE_LEN); |
| os_memcpy(data + 2 * ETH_ALEN + WPA_NONCE_LEN, nonce1, |
| WPA_NONCE_LEN); |
| } |
| |
| #ifdef CONFIG_IEEE80211W |
| if (use_sha256) |
| sha256_prf(pmk, pmk_len, label, data, sizeof(data), |
| ptk, ptk_len); |
| else |
| #endif /* CONFIG_IEEE80211W */ |
| sha1_prf(pmk, pmk_len, label, data, sizeof(data), ptk, |
| ptk_len); |
| |
| wpa_printf(MSG_DEBUG, "WPA: PTK derivation - A1=" MACSTR " A2=" MACSTR, |
| MAC2STR(addr1), MAC2STR(addr2)); |
| wpa_hexdump(MSG_DEBUG, "WPA: Nonce1", nonce1, WPA_NONCE_LEN); |
| wpa_hexdump(MSG_DEBUG, "WPA: Nonce2", nonce2, WPA_NONCE_LEN); |
| wpa_hexdump_key(MSG_DEBUG, "WPA: PMK", pmk, pmk_len); |
| wpa_hexdump_key(MSG_DEBUG, "WPA: PTK", ptk, ptk_len); |
| } |
| |
| |
| #ifdef CONFIG_IEEE80211R |
| int wpa_ft_mic(const u8 *kck, const u8 *sta_addr, const u8 *ap_addr, |
| u8 transaction_seqnum, const u8 *mdie, size_t mdie_len, |
| const u8 *ftie, size_t ftie_len, |
| const u8 *rsnie, size_t rsnie_len, |
| const u8 *ric, size_t ric_len, u8 *mic) |
| { |
| u8 *buf, *pos; |
| size_t buf_len; |
| |
| buf_len = 2 * ETH_ALEN + 1 + mdie_len + ftie_len + rsnie_len + ric_len; |
| buf = os_malloc(buf_len); |
| if (buf == NULL) |
| return -1; |
| |
| pos = buf; |
| os_memcpy(pos, sta_addr, ETH_ALEN); |
| pos += ETH_ALEN; |
| os_memcpy(pos, ap_addr, ETH_ALEN); |
| pos += ETH_ALEN; |
| *pos++ = transaction_seqnum; |
| if (rsnie) { |
| os_memcpy(pos, rsnie, rsnie_len); |
| pos += rsnie_len; |
| } |
| if (mdie) { |
| os_memcpy(pos, mdie, mdie_len); |
| pos += mdie_len; |
| } |
| if (ftie) { |
| struct rsn_ftie *_ftie; |
| os_memcpy(pos, ftie, ftie_len); |
| if (ftie_len < 2 + sizeof(*_ftie)) { |
| os_free(buf); |
| return -1; |
| } |
| _ftie = (struct rsn_ftie *) (pos + 2); |
| os_memset(_ftie->mic, 0, sizeof(_ftie->mic)); |
| pos += ftie_len; |
| } |
| if (ric) { |
| os_memcpy(pos, ric, ric_len); |
| pos += ric_len; |
| } |
| |
| wpa_hexdump(MSG_MSGDUMP, "FT: MIC data", buf, pos - buf); |
| if (omac1_aes_128(kck, buf, pos - buf, mic)) { |
| os_free(buf); |
| return -1; |
| } |
| |
| os_free(buf); |
| |
| return 0; |
| } |
| #endif /* CONFIG_IEEE80211R */ |
| |
| |
| #ifndef CONFIG_NO_WPA2 |
| static int rsn_selector_to_bitfield(const u8 *s) |
| { |
| if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_NONE) |
| return WPA_CIPHER_NONE; |
| if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_WEP40) |
| return WPA_CIPHER_WEP40; |
| if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_TKIP) |
| return WPA_CIPHER_TKIP; |
| if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_CCMP) |
| return WPA_CIPHER_CCMP; |
| if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_WEP104) |
| return WPA_CIPHER_WEP104; |
| #ifdef CONFIG_IEEE80211W |
| if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_AES_128_CMAC) |
| return WPA_CIPHER_AES_128_CMAC; |
| #endif /* CONFIG_IEEE80211W */ |
| return 0; |
| } |
| |
| |
| static int rsn_key_mgmt_to_bitfield(const u8 *s) |
| { |
| if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_UNSPEC_802_1X) |
| return WPA_KEY_MGMT_IEEE8021X; |
| if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X) |
| return WPA_KEY_MGMT_PSK; |
| #ifdef CONFIG_IEEE80211R |
| if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_FT_802_1X) |
| return WPA_KEY_MGMT_FT_IEEE8021X; |
| if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_FT_PSK) |
| return WPA_KEY_MGMT_FT_PSK; |
| #endif /* CONFIG_IEEE80211R */ |
| #ifdef CONFIG_IEEE80211W |
| if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_802_1X_SHA256) |
| return WPA_KEY_MGMT_IEEE8021X_SHA256; |
| if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_PSK_SHA256) |
| return WPA_KEY_MGMT_PSK_SHA256; |
| #endif /* CONFIG_IEEE80211W */ |
| return 0; |
| } |
| #endif /* CONFIG_NO_WPA2 */ |
| |
| |
| /** |
| * wpa_parse_wpa_ie_rsn - Parse RSN IE |
| * @rsn_ie: Buffer containing RSN IE |
| * @rsn_ie_len: RSN IE buffer length (including IE number and length octets) |
| * @data: Pointer to structure that will be filled in with parsed data |
| * Returns: 0 on success, <0 on failure |
| */ |
| int wpa_parse_wpa_ie_rsn(const u8 *rsn_ie, size_t rsn_ie_len, |
| struct wpa_ie_data *data) |
| { |
| #ifndef CONFIG_NO_WPA2 |
| const struct rsn_ie_hdr *hdr; |
| const u8 *pos; |
| int left; |
| int i, count; |
| |
| os_memset(data, 0, sizeof(*data)); |
| 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; |
| #ifdef CONFIG_IEEE80211W |
| data->mgmt_group_cipher = WPA_CIPHER_AES_128_CMAC; |
| #else /* CONFIG_IEEE80211W */ |
| data->mgmt_group_cipher = 0; |
| #endif /* CONFIG_IEEE80211W */ |
| |
| 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 != WLAN_EID_RSN || |
| 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 -2; |
| } |
| |
| pos = (const u8 *) (hdr + 1); |
| left = rsn_ie_len - sizeof(*hdr); |
| |
| if (left >= RSN_SELECTOR_LEN) { |
| data->group_cipher = rsn_selector_to_bitfield(pos); |
| #ifdef CONFIG_IEEE80211W |
| if (data->group_cipher == WPA_CIPHER_AES_128_CMAC) { |
| wpa_printf(MSG_DEBUG, "%s: AES-128-CMAC used as group " |
| "cipher", __func__); |
| return -1; |
| } |
| #endif /* CONFIG_IEEE80211W */ |
| 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 -3; |
| } |
| |
| 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 -4; |
| } |
| for (i = 0; i < count; i++) { |
| data->pairwise_cipher |= rsn_selector_to_bitfield(pos); |
| pos += RSN_SELECTOR_LEN; |
| left -= RSN_SELECTOR_LEN; |
| } |
| #ifdef CONFIG_IEEE80211W |
| if (data->pairwise_cipher & WPA_CIPHER_AES_128_CMAC) { |
| wpa_printf(MSG_DEBUG, "%s: AES-128-CMAC used as " |
| "pairwise cipher", __func__); |
| return -1; |
| } |
| #endif /* CONFIG_IEEE80211W */ |
| } else if (left == 1) { |
| wpa_printf(MSG_DEBUG, "%s: ie too short (for key mgmt)", |
| __func__); |
| return -5; |
| } |
| |
| 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 -6; |
| } |
| 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 -7; |
| } |
| |
| 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 < (int) data->num_pmkid * PMKID_LEN) { |
| wpa_printf(MSG_DEBUG, "%s: PMKID underflow " |
| "(num_pmkid=%lu left=%d)", |
| __func__, (unsigned long) data->num_pmkid, |
| left); |
| data->num_pmkid = 0; |
| return -9; |
| } else { |
| data->pmkid = pos; |
| pos += data->num_pmkid * PMKID_LEN; |
| left -= data->num_pmkid * PMKID_LEN; |
| } |
| } |
| |
| #ifdef CONFIG_IEEE80211W |
| if (left >= 4) { |
| data->mgmt_group_cipher = rsn_selector_to_bitfield(pos); |
| if (data->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) { |
| wpa_printf(MSG_DEBUG, "%s: Unsupported management " |
| "group cipher 0x%x", __func__, |
| data->mgmt_group_cipher); |
| return -10; |
| } |
| pos += RSN_SELECTOR_LEN; |
| left -= RSN_SELECTOR_LEN; |
| } |
| #endif /* CONFIG_IEEE80211W */ |
| |
| if (left > 0) { |
| wpa_printf(MSG_DEBUG, "%s: ie has %u trailing bytes - ignored", |
| __func__, left); |
| } |
| |
| return 0; |
| #else /* CONFIG_NO_WPA2 */ |
| return -1; |
| #endif /* CONFIG_NO_WPA2 */ |
| } |
| |
| |
| static int wpa_selector_to_bitfield(const u8 *s) |
| { |
| if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_NONE) |
| return WPA_CIPHER_NONE; |
| if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP40) |
| return WPA_CIPHER_WEP40; |
| if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_TKIP) |
| return WPA_CIPHER_TKIP; |
| if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_CCMP) |
| return WPA_CIPHER_CCMP; |
| if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP104) |
| return WPA_CIPHER_WEP104; |
| return 0; |
| } |
| |
| |
| static int wpa_key_mgmt_to_bitfield(const u8 *s) |
| { |
| if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_UNSPEC_802_1X) |
| return WPA_KEY_MGMT_IEEE8021X; |
| if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X) |
| return WPA_KEY_MGMT_PSK; |
| if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_NONE) |
| return WPA_KEY_MGMT_WPA_NONE; |
| return 0; |
| } |
| |
| |
| 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; |
| |
| os_memset(data, 0, sizeof(*data)); |
| 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; |
| data->mgmt_group_cipher = 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 != WLAN_EID_VENDOR_SPECIFIC || |
| hdr->len != wpa_ie_len - 2 || |
| RSN_SELECTOR_GET(hdr->oui) != WPA_OUI_TYPE || |
| WPA_GET_LE16(hdr->version) != WPA_VERSION) { |
| wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version", |
| __func__); |
| return -2; |
| } |
| |
| 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 -3; |
| } |
| |
| 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 -4; |
| } |
| 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 -5; |
| } |
| |
| 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 -6; |
| } |
| 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 -7; |
| } |
| |
| 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 - ignored", |
| __func__, left); |
| } |
| |
| return 0; |
| } |
| |
| |
| #ifdef CONFIG_IEEE80211R |
| |
| /** |
| * wpa_derive_pmk_r0 - Derive PMK-R0 and PMKR0Name |
| * |
| * IEEE Std 802.11r-2008 - 8.5.1.5.3 |
| */ |
| void wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len, |
| const u8 *ssid, size_t ssid_len, |
| const u8 *mdid, const u8 *r0kh_id, size_t r0kh_id_len, |
| const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name) |
| { |
| u8 buf[1 + WPA_MAX_SSID_LEN + MOBILITY_DOMAIN_ID_LEN + 1 + |
| FT_R0KH_ID_MAX_LEN + ETH_ALEN]; |
| u8 *pos, r0_key_data[48], hash[32]; |
| const u8 *addr[2]; |
| size_t len[2]; |
| |
| /* |
| * R0-Key-Data = KDF-384(XXKey, "FT-R0", |
| * SSIDlength || SSID || MDID || R0KHlength || |
| * R0KH-ID || S0KH-ID) |
| * XXKey is either the second 256 bits of MSK or PSK. |
| * PMK-R0 = L(R0-Key-Data, 0, 256) |
| * PMK-R0Name-Salt = L(R0-Key-Data, 256, 128) |
| */ |
| if (ssid_len > WPA_MAX_SSID_LEN || r0kh_id_len > FT_R0KH_ID_MAX_LEN) |
| return; |
| pos = buf; |
| *pos++ = ssid_len; |
| os_memcpy(pos, ssid, ssid_len); |
| pos += ssid_len; |
| os_memcpy(pos, mdid, MOBILITY_DOMAIN_ID_LEN); |
| pos += MOBILITY_DOMAIN_ID_LEN; |
| *pos++ = r0kh_id_len; |
| os_memcpy(pos, r0kh_id, r0kh_id_len); |
| pos += r0kh_id_len; |
| os_memcpy(pos, s0kh_id, ETH_ALEN); |
| pos += ETH_ALEN; |
| |
| sha256_prf(xxkey, xxkey_len, "FT-R0", buf, pos - buf, |
| r0_key_data, sizeof(r0_key_data)); |
| os_memcpy(pmk_r0, r0_key_data, PMK_LEN); |
| |
| /* |
| * PMKR0Name = Truncate-128(SHA-256("FT-R0N" || PMK-R0Name-Salt) |
| */ |
| addr[0] = (const u8 *) "FT-R0N"; |
| len[0] = 6; |
| addr[1] = r0_key_data + PMK_LEN; |
| len[1] = 16; |
| |
| sha256_vector(2, addr, len, hash); |
| os_memcpy(pmk_r0_name, hash, WPA_PMK_NAME_LEN); |
| } |
| |
| |
| /** |
| * wpa_derive_pmk_r1_name - Derive PMKR1Name |
| * |
| * IEEE Std 802.11r-2008 - 8.5.1.5.4 |
| */ |
| void wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id, |
| const u8 *s1kh_id, u8 *pmk_r1_name) |
| { |
| u8 hash[32]; |
| const u8 *addr[4]; |
| size_t len[4]; |
| |
| /* |
| * PMKR1Name = Truncate-128(SHA-256("FT-R1N" || PMKR0Name || |
| * R1KH-ID || S1KH-ID)) |
| */ |
| addr[0] = (const u8 *) "FT-R1N"; |
| len[0] = 6; |
| addr[1] = pmk_r0_name; |
| len[1] = WPA_PMK_NAME_LEN; |
| addr[2] = r1kh_id; |
| len[2] = FT_R1KH_ID_LEN; |
| addr[3] = s1kh_id; |
| len[3] = ETH_ALEN; |
| |
| sha256_vector(4, addr, len, hash); |
| os_memcpy(pmk_r1_name, hash, WPA_PMK_NAME_LEN); |
| } |
| |
| |
| /** |
| * wpa_derive_pmk_r1 - Derive PMK-R1 and PMKR1Name from PMK-R0 |
| * |
| * IEEE Std 802.11r-2008 - 8.5.1.5.4 |
| */ |
| void wpa_derive_pmk_r1(const u8 *pmk_r0, const u8 *pmk_r0_name, |
| const u8 *r1kh_id, const u8 *s1kh_id, |
| u8 *pmk_r1, u8 *pmk_r1_name) |
| { |
| u8 buf[FT_R1KH_ID_LEN + ETH_ALEN]; |
| u8 *pos; |
| |
| /* PMK-R1 = KDF-256(PMK-R0, "FT-R1", R1KH-ID || S1KH-ID) */ |
| pos = buf; |
| os_memcpy(pos, r1kh_id, FT_R1KH_ID_LEN); |
| pos += FT_R1KH_ID_LEN; |
| os_memcpy(pos, s1kh_id, ETH_ALEN); |
| pos += ETH_ALEN; |
| |
| sha256_prf(pmk_r0, PMK_LEN, "FT-R1", buf, pos - buf, pmk_r1, PMK_LEN); |
| |
| wpa_derive_pmk_r1_name(pmk_r0_name, r1kh_id, s1kh_id, pmk_r1_name); |
| } |
| |
| |
| /** |
| * wpa_pmk_r1_to_ptk - Derive PTK and PTKName from PMK-R1 |
| * |
| * IEEE Std 802.11r-2008 - 8.5.1.5.5 |
| */ |
| void wpa_pmk_r1_to_ptk(const u8 *pmk_r1, const u8 *snonce, const u8 *anonce, |
| const u8 *sta_addr, const u8 *bssid, |
| const u8 *pmk_r1_name, |
| u8 *ptk, size_t ptk_len, u8 *ptk_name) |
| { |
| u8 buf[2 * WPA_NONCE_LEN + 2 * ETH_ALEN]; |
| u8 *pos, hash[32]; |
| const u8 *addr[6]; |
| size_t len[6]; |
| |
| /* |
| * PTK = KDF-PTKLen(PMK-R1, "FT-PTK", SNonce || ANonce || |
| * BSSID || STA-ADDR) |
| */ |
| pos = buf; |
| os_memcpy(pos, snonce, WPA_NONCE_LEN); |
| pos += WPA_NONCE_LEN; |
| os_memcpy(pos, anonce, WPA_NONCE_LEN); |
| pos += WPA_NONCE_LEN; |
| os_memcpy(pos, bssid, ETH_ALEN); |
| pos += ETH_ALEN; |
| os_memcpy(pos, sta_addr, ETH_ALEN); |
| pos += ETH_ALEN; |
| |
| sha256_prf(pmk_r1, PMK_LEN, "FT-PTK", buf, pos - buf, ptk, ptk_len); |
| |
| /* |
| * PTKName = Truncate-128(SHA-256(PMKR1Name || "FT-PTKN" || SNonce || |
| * ANonce || BSSID || STA-ADDR)) |
| */ |
| addr[0] = pmk_r1_name; |
| len[0] = WPA_PMK_NAME_LEN; |
| addr[1] = (const u8 *) "FT-PTKN"; |
| len[1] = 7; |
| addr[2] = snonce; |
| len[2] = WPA_NONCE_LEN; |
| addr[3] = anonce; |
| len[3] = WPA_NONCE_LEN; |
| addr[4] = bssid; |
| len[4] = ETH_ALEN; |
| addr[5] = sta_addr; |
| len[5] = ETH_ALEN; |
| |
| sha256_vector(6, addr, len, hash); |
| os_memcpy(ptk_name, hash, WPA_PMK_NAME_LEN); |
| } |
| |
| #endif /* CONFIG_IEEE80211R */ |
| |
| |
| /** |
| * rsn_pmkid - Calculate PMK identifier |
| * @pmk: Pairwise master key |
| * @pmk_len: Length of pmk in bytes |
| * @aa: Authenticator address |
| * @spa: Supplicant address |
| * @pmkid: Buffer for PMKID |
| * @use_sha256: Whether to use SHA256-based KDF |
| * |
| * IEEE Std 802.11i-2004 - 8.5.1.2 Pairwise key hierarchy |
| * PMKID = HMAC-SHA1-128(PMK, "PMK Name" || AA || SPA) |
| */ |
| void rsn_pmkid(const u8 *pmk, size_t pmk_len, const u8 *aa, const u8 *spa, |
| u8 *pmkid, int use_sha256) |
| { |
| char *title = "PMK Name"; |
| const u8 *addr[3]; |
| const size_t len[3] = { 8, ETH_ALEN, ETH_ALEN }; |
| unsigned char hash[SHA256_MAC_LEN]; |
| |
| addr[0] = (u8 *) title; |
| addr[1] = aa; |
| addr[2] = spa; |
| |
| #ifdef CONFIG_IEEE80211W |
| if (use_sha256) |
| hmac_sha256_vector(pmk, pmk_len, 3, addr, len, hash); |
| else |
| #endif /* CONFIG_IEEE80211W */ |
| hmac_sha1_vector(pmk, pmk_len, 3, addr, len, hash); |
| os_memcpy(pmkid, hash, PMKID_LEN); |
| } |
| |
| |
| /** |
| * 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 |
| */ |
| 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"; |
| case WPA_CIPHER_CCMP | WPA_CIPHER_TKIP: |
| return "CCMP+TKIP"; |
| 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 |
| */ |
| const char * wpa_key_mgmt_txt(int key_mgmt, int proto) |
| { |
| switch (key_mgmt) { |
| case WPA_KEY_MGMT_IEEE8021X: |
| if (proto == (WPA_PROTO_RSN | WPA_PROTO_WPA)) |
| return "WPA2+WPA/IEEE 802.1X/EAP"; |
| return proto == WPA_PROTO_RSN ? |
| "WPA2/IEEE 802.1X/EAP" : "WPA/IEEE 802.1X/EAP"; |
| case WPA_KEY_MGMT_PSK: |
| if (proto == (WPA_PROTO_RSN | WPA_PROTO_WPA)) |
| return "WPA2-PSK+WPA-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)"; |
| #ifdef CONFIG_IEEE80211R |
| case WPA_KEY_MGMT_FT_IEEE8021X: |
| return "FT-EAP"; |
| case WPA_KEY_MGMT_FT_PSK: |
| return "FT-PSK"; |
| #endif /* CONFIG_IEEE80211R */ |
| #ifdef CONFIG_IEEE80211W |
| case WPA_KEY_MGMT_IEEE8021X_SHA256: |
| return "WPA2-EAP-SHA256"; |
| case WPA_KEY_MGMT_PSK_SHA256: |
| return "WPA2-PSK-SHA256"; |
| #endif /* CONFIG_IEEE80211W */ |
| default: |
| return "UNKNOWN"; |
| } |
| } |
| |
| |
| int wpa_compare_rsn_ie(int ft_initial_assoc, |
| const u8 *ie1, size_t ie1len, |
| const u8 *ie2, size_t ie2len) |
| { |
| if (ie1 == NULL || ie2 == NULL) |
| return -1; |
| |
| if (ie1len == ie2len && os_memcmp(ie1, ie2, ie1len) == 0) |
| return 0; /* identical IEs */ |
| |
| #ifdef CONFIG_IEEE80211R |
| if (ft_initial_assoc) { |
| struct wpa_ie_data ie1d, ie2d; |
| /* |
| * The PMKID-List in RSN IE is different between Beacon/Probe |
| * Response/(Re)Association Request frames and EAPOL-Key |
| * messages in FT initial mobility domain association. Allow |
| * for this, but verify that other parts of the RSN IEs are |
| * identical. |
| */ |
| if (wpa_parse_wpa_ie_rsn(ie1, ie1len, &ie1d) < 0 || |
| wpa_parse_wpa_ie_rsn(ie2, ie2len, &ie2d) < 0) |
| return -1; |
| if (ie1d.proto == ie2d.proto && |
| ie1d.pairwise_cipher == ie2d.pairwise_cipher && |
| ie1d.group_cipher == ie2d.group_cipher && |
| ie1d.key_mgmt == ie2d.key_mgmt && |
| ie1d.capabilities == ie2d.capabilities && |
| ie1d.mgmt_group_cipher == ie2d.mgmt_group_cipher) |
| return 0; |
| } |
| #endif /* CONFIG_IEEE80211R */ |
| |
| return -1; |
| } |
| |
| |
| #ifdef CONFIG_IEEE80211R |
| int wpa_insert_pmkid(u8 *ies, size_t ies_len, const u8 *pmkid) |
| { |
| u8 *start, *end, *rpos, *rend; |
| int added = 0; |
| |
| start = ies; |
| end = ies + ies_len; |
| |
| while (start < end) { |
| if (*start == WLAN_EID_RSN) |
| break; |
| start += 2 + start[1]; |
| } |
| if (start >= end) { |
| wpa_printf(MSG_ERROR, "FT: Could not find RSN IE in " |
| "IEs data"); |
| return -1; |
| } |
| wpa_hexdump(MSG_DEBUG, "FT: RSN IE before modification", |
| start, 2 + start[1]); |
| |
| /* Find start of PMKID-Count */ |
| rpos = start + 2; |
| rend = rpos + start[1]; |
| |
| /* Skip Version and Group Data Cipher Suite */ |
| rpos += 2 + 4; |
| /* Skip Pairwise Cipher Suite Count and List */ |
| rpos += 2 + WPA_GET_LE16(rpos) * RSN_SELECTOR_LEN; |
| /* Skip AKM Suite Count and List */ |
| rpos += 2 + WPA_GET_LE16(rpos) * RSN_SELECTOR_LEN; |
| |
| if (rpos == rend) { |
| /* Add RSN Capabilities */ |
| os_memmove(rpos + 2, rpos, end - rpos); |
| *rpos++ = 0; |
| *rpos++ = 0; |
| } else { |
| /* Skip RSN Capabilities */ |
| rpos += 2; |
| if (rpos > rend) { |
| wpa_printf(MSG_ERROR, "FT: Could not parse RSN IE in " |
| "IEs data"); |
| return -1; |
| } |
| } |
| |
| if (rpos == rend) { |
| /* No PMKID-Count field included; add it */ |
| os_memmove(rpos + 2 + PMKID_LEN, rpos, end - rpos); |
| WPA_PUT_LE16(rpos, 1); |
| rpos += 2; |
| os_memcpy(rpos, pmkid, PMKID_LEN); |
| added += 2 + PMKID_LEN; |
| start[1] += 2 + PMKID_LEN; |
| } else { |
| /* PMKID-Count was included; use it */ |
| if (WPA_GET_LE16(rpos) != 0) { |
| wpa_printf(MSG_ERROR, "FT: Unexpected PMKID " |
| "in RSN IE in EAPOL-Key data"); |
| return -1; |
| } |
| WPA_PUT_LE16(rpos, 1); |
| rpos += 2; |
| os_memmove(rpos + PMKID_LEN, rpos, end - rpos); |
| os_memcpy(rpos, pmkid, PMKID_LEN); |
| added += PMKID_LEN; |
| start[1] += PMKID_LEN; |
| } |
| |
| wpa_hexdump(MSG_DEBUG, "FT: RSN IE after modification " |
| "(PMKID inserted)", start, 2 + start[1]); |
| |
| return added; |
| } |
| #endif /* CONFIG_IEEE80211R */ |