/** * 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) { 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; } if (rsn_ie_len >= 6 && rsn_ie[1] >= 4 && rsn_ie[1] == rsn_ie_len - 2 && WPA_GET_BE32(&rsn_ie[2]) == OSEN_IE_VENDOR_TYPE) { pos = rsn_ie + 6; left = rsn_ie_len - 6; data->proto = WPA_PROTO_OSEN; } else { const struct rsn_ie_hdr *hdr; 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); if (!wpa_cipher_valid_group(data->group_cipher)) { wpa_printf(MSG_DEBUG, "%s: invalid group cipher 0x%x", __func__, data->group_cipher); return -1; } 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 || count > left / 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 || count > left / 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) { u16 num_pmkid = WPA_GET_LE16(pos); pos += 2; left -= 2; if (num_pmkid > (unsigned int) left / PMKID_LEN) { wpa_printf(MSG_DEBUG, "%s: PMKID underflow " "(num_pmkid=%u left=%d)", __func__, num_pmkid, left); data->num_pmkid = 0; return -9; } else { data->num_pmkid = num_pmkid; 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 (!wpa_cipher_valid_mgmt_group(data->mgmt_group_cipher)) { 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_hexdump(MSG_DEBUG, "wpa_parse_wpa_ie_rsn: ignore trailing bytes", pos, left); } return 0; }
static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len, int pairwise_cipher, int group_cipher, int key_mgmt, int mgmt_group_cipher, struct wpa_sm *sm) { u8 *pos; struct rsn_ie_hdr *hdr; u16 capab; u32 suite; 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)) { wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)", (unsigned long) rsn_ie_len); return -1; } hdr = (struct rsn_ie_hdr *) rsn_ie; hdr->elem_id = WLAN_EID_RSN; WPA_PUT_LE16(hdr->version, RSN_VERSION); pos = (u8 *) (hdr + 1); suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher); if (suite == 0) { wpa_printf(MSG_WARNING, "Invalid group cipher (%d).", group_cipher); return -1; } RSN_SELECTOR_PUT(pos, suite); pos += RSN_SELECTOR_LEN; *pos++ = 1; *pos++ = 0; suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher); if (suite == 0 || (!wpa_cipher_valid_pairwise(pairwise_cipher) && pairwise_cipher != WPA_CIPHER_NONE)) { wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).", pairwise_cipher); return -1; } RSN_SELECTOR_PUT(pos, suite); pos += RSN_SELECTOR_LEN; *pos++ = 1; *pos++ = 0; if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X); } else if (key_mgmt == WPA_KEY_MGMT_PSK) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X); } else if (key_mgmt == WPA_KEY_MGMT_CCKM) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_CCKM); #ifdef CONFIG_IEEE80211R } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); #endif /* CONFIG_IEEE80211R */ #ifdef CONFIG_IEEE80211W } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256); } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256); #endif /* CONFIG_IEEE80211W */ #ifdef CONFIG_SAE } else if (key_mgmt == WPA_KEY_MGMT_SAE) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE); } else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE); #endif /* CONFIG_SAE */ } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192); } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B) { RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B); } else { wpa_printf(MSG_WARNING, "Invalid key management type (%d).", key_mgmt); return -1; } pos += RSN_SELECTOR_LEN; /* RSN Capabilities */ capab = 0; #ifdef CONFIG_IEEE80211W if (sm->mfp) capab |= WPA_CAPABILITY_MFPC; if (sm->mfp == 2) capab |= WPA_CAPABILITY_MFPR; #endif /* CONFIG_IEEE80211W */ WPA_PUT_LE16(pos, capab); pos += 2; if (sm->cur_pmksa) { /* PMKID Count (2 octets, little endian) */ *pos++ = 1; *pos++ = 0; /* PMKID */ os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN); pos += PMKID_LEN; } #ifdef CONFIG_IEEE80211W if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) { if (!sm->cur_pmksa) { /* PMKID Count */ WPA_PUT_LE16(pos, 0); pos += 2; } /* Management Group Cipher Suite */ RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, mgmt_group_cipher)); pos += RSN_SELECTOR_LEN; } #endif /* CONFIG_IEEE80211W */ hdr->len = (pos - rsn_ie) - 2; WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len); return pos - rsn_ie; }