static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm, const struct wpa_eapol_key *key, const u8 *gtk, size_t gtk_len, int key_info) { #ifndef CONFIG_NO_WPA2 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 */ os_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; os_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, sm->bssid, key_info & WPA_KEY_INFO_SECURE); return 0; #else /* CONFIG_NO_WPA2 */ return -1; #endif /* CONFIG_NO_WPA2 */ }
static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm, const u8 *keydata, size_t keydatalen, u16 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; } os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2); if (ieee80211w_set_keys(sm, &ie) < 0) wpa_printf(MSG_INFO, "RSN: Failed to configure IGTK"); return 0; }
static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm, const struct wpa_eapol_key *key, const u8 *gtk, size_t 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 */ //printf("wpa_supplicant_pairwise_gtk\n"); printf("gk\n"); os_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; os_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)) { printf("RSN: Failed to install GTK\n"); return -1; } 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, size_t extra_len, u16 ver, struct wpa_gtk_data *gd) { size_t 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=%lu", (unsigned long) keydatalen, (unsigned long) extra_len); return -1; } if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { if (maxkeylen < 8) { wpa_printf(MSG_INFO, "WPA: Too short maxkeylen (%lu)", (unsigned long) maxkeylen); return -1; } 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) { os_memcpy(ek, key->key_iv, 16); os_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; } os_memcpy(gd->gtk, key + 1, keydatalen); if (rc4_skip(ek, 32, 256, gd->gtk, keydatalen)) { wpa_printf(MSG_ERROR, "WPA: RC4 failed"); return -1; } } 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; } } else { wpa_printf(MSG_WARNING, "WPA: Unsupported key_info type %d", ver); return -1; } gd->tx = wpa_supplicant_gtk_tx_bit_workaround( sm, !!(key_info & WPA_KEY_INFO_TXRX)); return 0; }