diff options
author | Sichen Zhao <1473996754@qq.com> | 2017-08-01 20:43:41 +0800 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2017-11-10 13:33:02 +0100 |
commit | 9c9d11b481ce0dcdfa9c69e6781cc15435cfb043 (patch) | |
tree | 3d0e6678afcdbb17d35606398f220fba66dcfa7b /freebsd/contrib/wpa/src/wps/wps_enrollee.c | |
parent | Fix build for non-FDT platforms (diff) | |
download | rtems-libbsd-9c9d11b481ce0dcdfa9c69e6781cc15435cfb043.tar.bz2 |
Import wpa from FreeBSD
Diffstat (limited to 'freebsd/contrib/wpa/src/wps/wps_enrollee.c')
-rw-r--r-- | freebsd/contrib/wpa/src/wps/wps_enrollee.c | 1510 |
1 files changed, 1510 insertions, 0 deletions
diff --git a/freebsd/contrib/wpa/src/wps/wps_enrollee.c b/freebsd/contrib/wpa/src/wps/wps_enrollee.c new file mode 100644 index 00000000..e2cfa571 --- /dev/null +++ b/freebsd/contrib/wpa/src/wps/wps_enrollee.c @@ -0,0 +1,1510 @@ +#include <machine/rtems-bsd-user-space.h> + +/* + * Wi-Fi Protected Setup - Enrollee + * Copyright (c) 2008, Jouni Malinen <j@w1.fi> + * + * This software may be distributed under the terms of the BSD license. + * See README for more details. + */ + +#include "includes.h" + +#include "common.h" +#include "crypto/crypto.h" +#include "crypto/sha256.h" +#include "crypto/random.h" +#include "wps_i.h" +#include "wps_dev_attr.h" + + +static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg) +{ + u8 state; + if (wps->wps->ap) + state = wps->wps->wps_state; + else + state = WPS_STATE_NOT_CONFIGURED; + wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", + state); + wpabuf_put_be16(msg, ATTR_WPS_STATE); + wpabuf_put_be16(msg, 1); + wpabuf_put_u8(msg, state); + return 0; +} + + +static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) +{ + u8 *hash; + const u8 *addr[4]; + size_t len[4]; + + if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) + return -1; + wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); + wpa_hexdump(MSG_DEBUG, "WPS: E-S2", + wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); + + if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { + wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " + "E-Hash derivation"); + return -1; + } + + wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); + wpabuf_put_be16(msg, ATTR_E_HASH1); + wpabuf_put_be16(msg, SHA256_MAC_LEN); + hash = wpabuf_put(msg, SHA256_MAC_LEN); + /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ + addr[0] = wps->snonce; + len[0] = WPS_SECRET_NONCE_LEN; + addr[1] = wps->psk1; + len[1] = WPS_PSK_LEN; + addr[2] = wpabuf_head(wps->dh_pubkey_e); + len[2] = wpabuf_len(wps->dh_pubkey_e); + addr[3] = wpabuf_head(wps->dh_pubkey_r); + len[3] = wpabuf_len(wps->dh_pubkey_r); + hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); + wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); + + wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); + wpabuf_put_be16(msg, ATTR_E_HASH2); + wpabuf_put_be16(msg, SHA256_MAC_LEN); + hash = wpabuf_put(msg, SHA256_MAC_LEN); + /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ + addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; + addr[1] = wps->psk2; + hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); + wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); + + return 0; +} + + +static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) +{ + wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); + wpabuf_put_be16(msg, ATTR_E_SNONCE1); + wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); + wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); + return 0; +} + + +static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) +{ + wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); + wpabuf_put_be16(msg, ATTR_E_SNONCE2); + wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); + wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, + WPS_SECRET_NONCE_LEN); + return 0; +} + + +static struct wpabuf * wps_build_m1(struct wps_data *wps) +{ + struct wpabuf *msg; + u16 config_methods; + + if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) + return NULL; + wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", + wps->nonce_e, WPS_NONCE_LEN); + + wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); + msg = wpabuf_alloc(1000); + if (msg == NULL) + return NULL; + + config_methods = wps->wps->config_methods; + if (wps->wps->ap && !wps->pbc_in_m1 && + (wps->dev_password_len != 0 || + (config_methods & WPS_CONFIG_DISPLAY))) { + /* + * These are the methods that the AP supports as an Enrollee + * for adding external Registrars, so remove PushButton. + * + * As a workaround for Windows 7 mechanism for probing WPS + * capabilities from M1, leave PushButton option if no PIN + * method is available or if WPS configuration enables PBC + * workaround. + */ + config_methods &= ~WPS_CONFIG_PUSHBUTTON; + config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | + WPS_CONFIG_PHY_PUSHBUTTON); + } + + if (wps_build_version(msg) || + wps_build_msg_type(msg, WPS_M1) || + wps_build_uuid_e(msg, wps->uuid_e) || + wps_build_mac_addr(msg, wps->mac_addr_e) || + wps_build_enrollee_nonce(wps, msg) || + wps_build_public_key(wps, msg) || + wps_build_auth_type_flags(wps, msg) || + wps_build_encr_type_flags(wps, msg) || + wps_build_conn_type_flags(wps, msg) || + wps_build_config_methods(msg, config_methods) || + wps_build_wps_state(wps, msg) || + wps_build_device_attrs(&wps->wps->dev, msg) || + wps_build_rf_bands(&wps->wps->dev, msg, + wps->wps->rf_band_cb(wps->wps->cb_ctx)) || + wps_build_assoc_state(wps, msg) || + wps_build_dev_password_id(msg, wps->dev_pw_id) || + wps_build_config_error(msg, WPS_CFG_NO_ERROR) || + wps_build_os_version(&wps->wps->dev, msg) || + wps_build_wfa_ext(msg, 0, NULL, 0) || + wps_build_vendor_ext_m1(&wps->wps->dev, msg)) { + wpabuf_free(msg); + return NULL; + } + + wps->state = RECV_M2; + return msg; +} + + +static struct wpabuf * wps_build_m3(struct wps_data *wps) +{ + struct wpabuf *msg; + + wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); + + if (wps->dev_password == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); + return NULL; + } + wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); + + if (wps->wps->ap && random_pool_ready() != 1) { + wpa_printf(MSG_INFO, + "WPS: Not enough entropy in random pool to proceed - do not allow AP PIN to be used"); + return NULL; + } + + msg = wpabuf_alloc(1000); + if (msg == NULL) + return NULL; + + if (wps_build_version(msg) || + wps_build_msg_type(msg, WPS_M3) || + wps_build_registrar_nonce(wps, msg) || + wps_build_e_hash(wps, msg) || + wps_build_wfa_ext(msg, 0, NULL, 0) || + wps_build_authenticator(wps, msg)) { + wpabuf_free(msg); + return NULL; + } + + wps->state = RECV_M4; + return msg; +} + + +static struct wpabuf * wps_build_m5(struct wps_data *wps) +{ + struct wpabuf *msg, *plain; + + wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); + + plain = wpabuf_alloc(200); + if (plain == NULL) + return NULL; + + msg = wpabuf_alloc(1000); + if (msg == NULL) { + wpabuf_free(plain); + return NULL; + } + + if (wps_build_version(msg) || + wps_build_msg_type(msg, WPS_M5) || + wps_build_registrar_nonce(wps, msg) || + wps_build_e_snonce1(wps, plain) || + wps_build_key_wrap_auth(wps, plain) || + wps_build_encr_settings(wps, msg, plain) || + wps_build_wfa_ext(msg, 0, NULL, 0) || + wps_build_authenticator(wps, msg)) { + wpabuf_free(plain); + wpabuf_free(msg); + return NULL; + } + wpabuf_free(plain); + + wps->state = RECV_M6; + return msg; +} + + +static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) +{ + wpa_printf(MSG_DEBUG, "WPS: * SSID"); + wpabuf_put_be16(msg, ATTR_SSID); + wpabuf_put_be16(msg, wps->wps->ssid_len); + wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); + return 0; +} + + +static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) +{ + u16 auth_type = wps->wps->ap_auth_type; + + /* + * Work around issues with Windows 7 WPS implementation not liking + * multiple Authentication Type bits in M7 AP Settings attribute by + * showing only the most secure option from current configuration. + */ + if (auth_type & WPS_AUTH_WPA2PSK) + auth_type = WPS_AUTH_WPA2PSK; + else if (auth_type & WPS_AUTH_WPAPSK) + auth_type = WPS_AUTH_WPAPSK; + else if (auth_type & WPS_AUTH_OPEN) + auth_type = WPS_AUTH_OPEN; + + wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type); + wpabuf_put_be16(msg, ATTR_AUTH_TYPE); + wpabuf_put_be16(msg, 2); + wpabuf_put_be16(msg, auth_type); + return 0; +} + + +static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) +{ + u16 encr_type = wps->wps->ap_encr_type; + + /* + * Work around issues with Windows 7 WPS implementation not liking + * multiple Encryption Type bits in M7 AP Settings attribute by + * showing only the most secure option from current configuration. + */ + if (wps->wps->ap_auth_type & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) { + if (encr_type & WPS_ENCR_AES) + encr_type = WPS_ENCR_AES; + else if (encr_type & WPS_ENCR_TKIP) + encr_type = WPS_ENCR_TKIP; + } + + wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type); + wpabuf_put_be16(msg, ATTR_ENCR_TYPE); + wpabuf_put_be16(msg, 2); + wpabuf_put_be16(msg, encr_type); + return 0; +} + + +static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) +{ + if ((wps->wps->ap_auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) && + wps->wps->network_key_len == 0) { + char hex[65]; + u8 psk[32]; + /* Generate a random per-device PSK */ + if (random_pool_ready() != 1 || + random_get_bytes(psk, sizeof(psk)) < 0) { + wpa_printf(MSG_INFO, + "WPS: Could not generate random PSK"); + return -1; + } + wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK", + psk, sizeof(psk)); + wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", + (unsigned int) wps->new_psk_len * 2); + wpa_snprintf_hex(hex, sizeof(hex), psk, sizeof(psk)); + wpabuf_put_be16(msg, ATTR_NETWORK_KEY); + wpabuf_put_be16(msg, sizeof(psk) * 2); + wpabuf_put_data(msg, hex, sizeof(psk) * 2); + if (wps->wps->registrar) { + wps_cb_new_psk(wps->wps->registrar, + wps->peer_dev.mac_addr, + wps->p2p_dev_addr, psk, sizeof(psk)); + } + return 0; + } + + wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", + (unsigned int) wps->wps->network_key_len); + wpabuf_put_be16(msg, ATTR_NETWORK_KEY); + wpabuf_put_be16(msg, wps->wps->network_key_len); + wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); + return 0; +} + + +static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) +{ + wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); + wpabuf_put_be16(msg, ATTR_MAC_ADDR); + wpabuf_put_be16(msg, ETH_ALEN); + wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); + return 0; +} + + +static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) +{ + const u8 *start, *end; + int ret; + + if (wps->wps->ap_settings) { + wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); + wpabuf_put_data(plain, wps->wps->ap_settings, + wps->wps->ap_settings_len); + return 0; + } + + wpa_printf(MSG_DEBUG, "WPS: * AP Settings based on current configuration"); + start = wpabuf_put(plain, 0); + ret = wps_build_cred_ssid(wps, plain) || + wps_build_cred_mac_addr(wps, plain) || + wps_build_cred_auth_type(wps, plain) || + wps_build_cred_encr_type(wps, plain) || + wps_build_cred_network_key(wps, plain); + end = wpabuf_put(plain, 0); + + wpa_hexdump_key(MSG_DEBUG, "WPS: Plaintext AP Settings", + start, end - start); + + return ret; +} + + +static struct wpabuf * wps_build_m7(struct wps_data *wps) +{ + struct wpabuf *msg, *plain; + + wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); + + plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); + if (plain == NULL) + return NULL; + + msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); + if (msg == NULL) { + wpabuf_free(plain); + return NULL; + } + + if (wps_build_version(msg) || + wps_build_msg_type(msg, WPS_M7) || + wps_build_registrar_nonce(wps, msg) || + wps_build_e_snonce2(wps, plain) || + (wps->wps->ap && wps_build_ap_settings(wps, plain)) || + wps_build_key_wrap_auth(wps, plain) || + wps_build_encr_settings(wps, msg, plain) || + wps_build_wfa_ext(msg, 0, NULL, 0) || + wps_build_authenticator(wps, msg)) { + wpabuf_free(plain); + wpabuf_free(msg); + return NULL; + } + wpabuf_free(plain); + + if (wps->wps->ap && wps->wps->registrar) { + /* + * If the Registrar is only learning our current configuration, + * it may not continue protocol run to successful completion. + * Store information here to make sure it remains available. + */ + wps_device_store(wps->wps->registrar, &wps->peer_dev, + wps->uuid_r); + } + + wps->state = RECV_M8; + return msg; +} + + +static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) +{ + struct wpabuf *msg; + + wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); + + msg = wpabuf_alloc(1000); + if (msg == NULL) + return NULL; + + if (wps_build_version(msg) || + wps_build_msg_type(msg, WPS_WSC_DONE) || + wps_build_enrollee_nonce(wps, msg) || + wps_build_registrar_nonce(wps, msg) || + wps_build_wfa_ext(msg, 0, NULL, 0)) { + wpabuf_free(msg); + return NULL; + } + + if (wps->wps->ap) + wps->state = RECV_ACK; + else { + wps_success_event(wps->wps, wps->peer_dev.mac_addr); + wps->state = WPS_FINISHED; + } + return msg; +} + + +struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, + enum wsc_op_code *op_code) +{ + struct wpabuf *msg; + + switch (wps->state) { + case SEND_M1: + msg = wps_build_m1(wps); + *op_code = WSC_MSG; + break; + case SEND_M3: + msg = wps_build_m3(wps); + *op_code = WSC_MSG; + break; + case SEND_M5: + msg = wps_build_m5(wps); + *op_code = WSC_MSG; + break; + case SEND_M7: + msg = wps_build_m7(wps); + *op_code = WSC_MSG; + break; + case RECEIVED_M2D: + if (wps->wps->ap) { + msg = wps_build_wsc_nack(wps); + *op_code = WSC_NACK; + break; + } + msg = wps_build_wsc_ack(wps); + *op_code = WSC_ACK; + if (msg) { + /* Another M2/M2D may be received */ + wps->state = RECV_M2; + } + break; + case SEND_WSC_NACK: + msg = wps_build_wsc_nack(wps); + *op_code = WSC_NACK; + break; + case WPS_MSG_DONE: + msg = wps_build_wsc_done(wps); + *op_code = WSC_Done; + break; + default: + wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " + "a message", wps->state); + msg = NULL; + break; + } + + if (*op_code == WSC_MSG && msg) { + /* Save a copy of the last message for Authenticator derivation + */ + wpabuf_free(wps->last_msg); + wps->last_msg = wpabuf_dup(msg); + } + + return msg; +} + + +static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) +{ + if (r_nonce == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); + return -1; + } + + os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); + wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", + wps->nonce_r, WPS_NONCE_LEN); + + return 0; +} + + +static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) +{ + if (e_nonce == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); + return -1; + } + + if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { + wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); + return -1; + } + + return 0; +} + + +static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) +{ + if (uuid_r == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); + return -1; + } + + os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); + wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); + + return 0; +} + + +static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, + size_t pk_len) +{ + if (pk == NULL || pk_len == 0) { + wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); + return -1; + } + + if (wps->peer_pubkey_hash_set) { + u8 hash[WPS_HASH_LEN]; + sha256_vector(1, &pk, &pk_len, hash); + if (os_memcmp_const(hash, wps->peer_pubkey_hash, + WPS_OOB_PUBKEY_HASH_LEN) != 0) { + wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch"); + wpa_hexdump(MSG_DEBUG, "WPS: Received public key", + pk, pk_len); + wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key " + "hash", hash, WPS_OOB_PUBKEY_HASH_LEN); + wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash", + wps->peer_pubkey_hash, + WPS_OOB_PUBKEY_HASH_LEN); + wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH; + return -1; + } + } + + wpabuf_free(wps->dh_pubkey_r); + wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); + if (wps->dh_pubkey_r == NULL) + return -1; + + if (wps_derive_keys(wps) < 0) + return -1; + + return 0; +} + + +static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) +{ + if (r_hash1 == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); + return -1; + } + + os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); + wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); + + return 0; +} + + +static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) +{ + if (r_hash2 == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); + return -1; + } + + os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); + wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); + + return 0; +} + + +static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) +{ + u8 hash[SHA256_MAC_LEN]; + const u8 *addr[4]; + size_t len[4]; + + if (r_snonce1 == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); + return -1; + } + + wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, + WPS_SECRET_NONCE_LEN); + + /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ + addr[0] = r_snonce1; + len[0] = WPS_SECRET_NONCE_LEN; + addr[1] = wps->psk1; + len[1] = WPS_PSK_LEN; + addr[2] = wpabuf_head(wps->dh_pubkey_e); + len[2] = wpabuf_len(wps->dh_pubkey_e); + addr[3] = wpabuf_head(wps->dh_pubkey_r); + len[3] = wpabuf_len(wps->dh_pubkey_r); + hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); + + if (os_memcmp_const(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { + wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " + "not match with the pre-committed value"); + wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; + wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr); + return -1; + } + + wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " + "half of the device password"); + + return 0; +} + + +static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) +{ + u8 hash[SHA256_MAC_LEN]; + const u8 *addr[4]; + size_t len[4]; + + if (r_snonce2 == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); + return -1; + } + + wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, + WPS_SECRET_NONCE_LEN); + + /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ + addr[0] = r_snonce2; + len[0] = WPS_SECRET_NONCE_LEN; + addr[1] = wps->psk2; + len[1] = WPS_PSK_LEN; + addr[2] = wpabuf_head(wps->dh_pubkey_e); + len[2] = wpabuf_len(wps->dh_pubkey_e); + addr[3] = wpabuf_head(wps->dh_pubkey_r); + len[3] = wpabuf_len(wps->dh_pubkey_r); + hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); + + if (os_memcmp_const(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { + wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " + "not match with the pre-committed value"); + wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; + wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr); + return -1; + } + + wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " + "half of the device password"); + + return 0; +} + + +static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, + size_t cred_len, int wps2) +{ + struct wps_parse_attr attr; + struct wpabuf msg; + int ret = 0; + + wpa_printf(MSG_DEBUG, "WPS: Received Credential"); + os_memset(&wps->cred, 0, sizeof(wps->cred)); + wpabuf_set(&msg, cred, cred_len); + if (wps_parse_msg(&msg, &attr) < 0 || + wps_process_cred(&attr, &wps->cred)) + return -1; + + if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != + 0) { + wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" + MACSTR ") does not match with own address (" MACSTR + ")", MAC2STR(wps->cred.mac_addr), + MAC2STR(wps->wps->dev.mac_addr)); + /* + * In theory, this could be consider fatal error, but there are + * number of deployed implementations using other address here + * due to unclarity in the specification. For interoperability + * reasons, allow this to be processed since we do not really + * use the MAC Address information for anything. + */ +#ifdef CONFIG_WPS_STRICT + if (wps2) { + wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " + "MAC Address in AP Settings"); + return -1; + } +#endif /* CONFIG_WPS_STRICT */ + } + + if (!(wps->cred.encr_type & + (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { + if (wps->cred.encr_type & WPS_ENCR_WEP) { + wpa_printf(MSG_INFO, "WPS: Reject Credential " + "due to WEP configuration"); + wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; + return -2; + } + + wpa_printf(MSG_INFO, "WPS: Reject Credential due to " + "invalid encr_type 0x%x", wps->cred.encr_type); + return -1; + } + + if (wps->wps->cred_cb) { + wps->cred.cred_attr = cred - 4; + wps->cred.cred_attr_len = cred_len + 4; + ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); + wps->cred.cred_attr = NULL; + wps->cred.cred_attr_len = 0; + } + + return ret; +} + + +static int wps_process_creds(struct wps_data *wps, const u8 *cred[], + u16 cred_len[], unsigned int num_cred, int wps2) +{ + size_t i; + int ok = 0; + + if (wps->wps->ap) + return 0; + + if (num_cred == 0) { + wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " + "received"); + return -1; + } + + for (i = 0; i < num_cred; i++) { + int res; + res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); + if (res == 0) + ok++; + else if (res == -2) + wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); + else + return -1; + } + + if (ok == 0) { + wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " + "received"); + return -1; + } + + return 0; +} + + +static int wps_process_ap_settings_e(struct wps_data *wps, + struct wps_parse_attr *attr, + struct wpabuf *attrs, int wps2) +{ + struct wps_credential cred; + int ret = 0; + + if (!wps->wps->ap) + return 0; + + if (wps_process_ap_settings(attr, &cred) < 0) + return -1; + + wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " + "Registrar"); + + if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != + 0) { + wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" + MACSTR ") does not match with own address (" MACSTR + ")", MAC2STR(cred.mac_addr), + MAC2STR(wps->wps->dev.mac_addr)); + /* + * In theory, this could be consider fatal error, but there are + * number of deployed implementations using other address here + * due to unclarity in the specification. For interoperability + * reasons, allow this to be processed since we do not really + * use the MAC Address information for anything. + */ +#ifdef CONFIG_WPS_STRICT + if (wps2) { + wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " + "MAC Address in AP Settings"); + return -1; + } +#endif /* CONFIG_WPS_STRICT */ + } + + if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) + { + if (cred.encr_type & WPS_ENCR_WEP) { + wpa_printf(MSG_INFO, "WPS: Reject new AP settings " + "due to WEP configuration"); + wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; + return -1; + } + + wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " + "invalid encr_type 0x%x", cred.encr_type); + return -1; + } + +#ifdef CONFIG_WPS_STRICT + if (wps2) { + if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == + WPS_ENCR_TKIP || + (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == + WPS_AUTH_WPAPSK) { + wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " + "AP Settings: WPA-Personal/TKIP only"); + wps->error_indication = + WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; + return -1; + } + } +#endif /* CONFIG_WPS_STRICT */ + + if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) + { + wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " + "TKIP+AES"); + cred.encr_type |= WPS_ENCR_AES; + } + + if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == + WPS_AUTH_WPAPSK) { + wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " + "WPAPSK+WPA2PSK"); + cred.auth_type |= WPS_AUTH_WPA2PSK; + } + + if (wps->wps->cred_cb) { + cred.cred_attr = wpabuf_head(attrs); + cred.cred_attr_len = wpabuf_len(attrs); + ret = wps->wps->cred_cb(wps->wps->cb_ctx, &cred); + } + + return ret; +} + + +static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) +{ + u16 id; + + if (dev_pw_id == NULL) { + wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); + return -1; + } + + id = WPA_GET_BE16(dev_pw_id); + if (wps->dev_pw_id == id) { + wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); + return 0; + } + +#ifdef CONFIG_P2P + if ((id == DEV_PW_DEFAULT && + wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || + (id == DEV_PW_REGISTRAR_SPECIFIED && + wps->dev_pw_id == DEV_PW_DEFAULT)) { + /* + * Common P2P use cases indicate whether the PIN is from the + * client or GO using Device Password Id in M1/M2 in a way that + * does not look fully compliant with WSC specification. Anyway, + * this is deployed and needs to be allowed, so ignore changes + * between Registrar-Specified and Default PIN. + */ + wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " + "change"); + return 0; + } +#endif /* CONFIG_P2P */ + + wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " + "ID from %u to %u", wps->dev_pw_id, id); + + if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) { + wpa_printf(MSG_DEBUG, + "WPS: Workaround - ignore PBC-to-PIN change"); + return 0; + } + + if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { + wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); + bin_clear_free(wps->dev_password, wps->dev_password_len); + wps->dev_pw_id = wps->alt_dev_pw_id; + wps->dev_password = wps->alt_dev_password; + wps->dev_password_len = wps->alt_dev_password_len; + wps->alt_dev_password = NULL; + wps->alt_dev_password_len = 0; + return 0; + } + + return -1; +} + + +static enum wps_process_res wps_process_m2(struct wps_data *wps, + const struct wpabuf *msg, + struct wps_parse_attr *attr) +{ + wpa_printf(MSG_DEBUG, "WPS: Received M2"); + + if (wps->state != RECV_M2) { + wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " + "receiving M2", wps->state); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || + wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || + wps_process_uuid_r(wps, attr->uuid_r) || + wps_process_dev_pw_id(wps, attr->dev_password_id)) { + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + /* + * Stop here on an AP as an Enrollee if AP Setup is locked unless the + * special locked mode is used to allow protocol run up to M7 in order + * to support external Registrars that only learn the current AP + * configuration without changing it. + */ + if (wps->wps->ap && + ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || + wps->dev_password == NULL)) { + wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " + "registration of a new Registrar"); + wps->config_error = WPS_CFG_SETUP_LOCKED; + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || + wps_process_authenticator(wps, attr->authenticator, msg) || + wps_process_device_attrs(&wps->peer_dev, attr)) { + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + +#ifdef CONFIG_WPS_NFC + if (wps->peer_pubkey_hash_set) { + struct wpabuf *decrypted; + struct wps_parse_attr eattr; + + decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, + attr->encr_settings_len); + if (decrypted == NULL) { + wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt " + "Encrypted Settings attribute"); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted " + "Settings attribute"); + if (wps_parse_msg(decrypted, &eattr) < 0 || + wps_process_key_wrap_auth(wps, decrypted, + eattr.key_wrap_auth) || + wps_process_creds(wps, eattr.cred, eattr.cred_len, + eattr.num_cred, attr->version2 != NULL)) { + wpabuf_free(decrypted); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + wpabuf_free(decrypted); + + wps->state = WPS_MSG_DONE; + return WPS_CONTINUE; + } +#endif /* CONFIG_WPS_NFC */ + + wps->state = SEND_M3; + return WPS_CONTINUE; +} + + +static enum wps_process_res wps_process_m2d(struct wps_data *wps, + struct wps_parse_attr *attr) +{ + wpa_printf(MSG_DEBUG, "WPS: Received M2D"); + + if (wps->state != RECV_M2) { + wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " + "receiving M2D", wps->state); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", + attr->manufacturer, attr->manufacturer_len); + wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", + attr->model_name, attr->model_name_len); + wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", + attr->model_number, attr->model_number_len); + wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", + attr->serial_number, attr->serial_number_len); + wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", + attr->dev_name, attr->dev_name_len); + + if (wps->wps->event_cb) { + union wps_event_data data; + struct wps_event_m2d *m2d = &data.m2d; + os_memset(&data, 0, sizeof(data)); + if (attr->config_methods) + m2d->config_methods = + WPA_GET_BE16(attr->config_methods); + m2d->manufacturer = attr->manufacturer; + m2d->manufacturer_len = attr->manufacturer_len; + m2d->model_name = attr->model_name; + m2d->model_name_len = attr->model_name_len; + m2d->model_number = attr->model_number; + m2d->model_number_len = attr->model_number_len; + m2d->serial_number = attr->serial_number; + m2d->serial_number_len = attr->serial_number_len; + m2d->dev_name = attr->dev_name; + m2d->dev_name_len = attr->dev_name_len; + m2d->primary_dev_type = attr->primary_dev_type; + if (attr->config_error) + m2d->config_error = + WPA_GET_BE16(attr->config_error); + if (attr->dev_password_id) + m2d->dev_password_id = + WPA_GET_BE16(attr->dev_password_id); + wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); + } + + wps->state = RECEIVED_M2D; + return WPS_CONTINUE; +} + + +static enum wps_process_res wps_process_m4(struct wps_data *wps, + const struct wpabuf *msg, + struct wps_parse_attr *attr) +{ + struct wpabuf *decrypted; + struct wps_parse_attr eattr; + + wpa_printf(MSG_DEBUG, "WPS: Received M4"); + + if (wps->state != RECV_M4) { + wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " + "receiving M4", wps->state); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || + wps_process_authenticator(wps, attr->authenticator, msg) || + wps_process_r_hash1(wps, attr->r_hash1) || + wps_process_r_hash2(wps, attr->r_hash2)) { + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, + attr->encr_settings_len); + if (decrypted == NULL) { + wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " + "Settings attribute"); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { + wpabuf_free(decrypted); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " + "attribute"); + if (wps_parse_msg(decrypted, &eattr) < 0 || + wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || + wps_process_r_snonce1(wps, eattr.r_snonce1)) { + wpabuf_free(decrypted); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + wpabuf_free(decrypted); + + wps->state = SEND_M5; + return WPS_CONTINUE; +} + + +static enum wps_process_res wps_process_m6(struct wps_data *wps, + const struct wpabuf *msg, + struct wps_parse_attr *attr) +{ + struct wpabuf *decrypted; + struct wps_parse_attr eattr; + + wpa_printf(MSG_DEBUG, "WPS: Received M6"); + + if (wps->state != RECV_M6) { + wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " + "receiving M6", wps->state); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || + wps_process_authenticator(wps, attr->authenticator, msg)) { + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, + attr->encr_settings_len); + if (decrypted == NULL) { + wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " + "Settings attribute"); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { + wpabuf_free(decrypted); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " + "attribute"); + if (wps_parse_msg(decrypted, &eattr) < 0 || + wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || + wps_process_r_snonce2(wps, eattr.r_snonce2)) { + wpabuf_free(decrypted); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + wpabuf_free(decrypted); + + if (wps->wps->ap) + wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, + NULL); + + wps->state = SEND_M7; + return WPS_CONTINUE; +} + + +static enum wps_process_res wps_process_m8(struct wps_data *wps, + const struct wpabuf *msg, + struct wps_parse_attr *attr) +{ + struct wpabuf *decrypted; + struct wps_parse_attr eattr; + + wpa_printf(MSG_DEBUG, "WPS: Received M8"); + + if (wps->state != RECV_M8) { + wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " + "receiving M8", wps->state); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || + wps_process_authenticator(wps, attr->authenticator, msg)) { + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + if (wps->wps->ap && wps->wps->ap_setup_locked) { + /* + * Stop here if special ap_setup_locked == 2 mode allowed the + * protocol to continue beyond M2. This allows ER to learn the + * current AP settings without changing them. + */ + wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " + "registration of a new Registrar"); + wps->config_error = WPS_CFG_SETUP_LOCKED; + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, + attr->encr_settings_len); + if (decrypted == NULL) { + wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " + "Settings attribute"); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + if (wps_validate_m8_encr(decrypted, wps->wps->ap, + attr->version2 != NULL) < 0) { + wpabuf_free(decrypted); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " + "attribute"); + if (wps_parse_msg(decrypted, &eattr) < 0 || + wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || + wps_process_creds(wps, eattr.cred, eattr.cred_len, + eattr.num_cred, attr->version2 != NULL) || + wps_process_ap_settings_e(wps, &eattr, decrypted, + attr->version2 != NULL)) { + wpabuf_free(decrypted); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + wpabuf_free(decrypted); + + wps->state = WPS_MSG_DONE; + return WPS_CONTINUE; +} + + +static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, + const struct wpabuf *msg) +{ + struct wps_parse_attr attr; + enum wps_process_res ret = WPS_CONTINUE; + + wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); + + if (wps_parse_msg(msg, &attr) < 0) + return WPS_FAILURE; + + if (attr.enrollee_nonce == NULL || + os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { + wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); + return WPS_FAILURE; + } + + if (attr.msg_type == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); + wps->state = SEND_WSC_NACK; + return WPS_CONTINUE; + } + + switch (*attr.msg_type) { + case WPS_M2: + if (wps_validate_m2(msg) < 0) + return WPS_FAILURE; + ret = wps_process_m2(wps, msg, &attr); + break; + case WPS_M2D: + if (wps_validate_m2d(msg) < 0) + return WPS_FAILURE; + ret = wps_process_m2d(wps, &attr); + break; + case WPS_M4: + if (wps_validate_m4(msg) < 0) + return WPS_FAILURE; + ret = wps_process_m4(wps, msg, &attr); + if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) + wps_fail_event(wps->wps, WPS_M4, wps->config_error, + wps->error_indication, + wps->peer_dev.mac_addr); + break; + case WPS_M6: + if (wps_validate_m6(msg) < 0) + return WPS_FAILURE; + ret = wps_process_m6(wps, msg, &attr); + if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) + wps_fail_event(wps->wps, WPS_M6, wps->config_error, + wps->error_indication, + wps->peer_dev.mac_addr); + break; + case WPS_M8: + if (wps_validate_m8(msg) < 0) + return WPS_FAILURE; + ret = wps_process_m8(wps, msg, &attr); + if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) + wps_fail_event(wps->wps, WPS_M8, wps->config_error, + wps->error_indication, + wps->peer_dev.mac_addr); + break; + default: + wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", + *attr.msg_type); + return WPS_FAILURE; + } + + /* + * Save a copy of the last message for Authenticator derivation if we + * are continuing. However, skip M2D since it is not authenticated and + * neither is the ACK/NACK response frame. This allows the possibly + * following M2 to be processed correctly by using the previously sent + * M1 in Authenticator derivation. + */ + if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { + /* Save a copy of the last message for Authenticator derivation + */ + wpabuf_free(wps->last_msg); + wps->last_msg = wpabuf_dup(msg); + } + + return ret; +} + + +static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, + const struct wpabuf *msg) +{ + struct wps_parse_attr attr; + + wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); + + if (wps_parse_msg(msg, &attr) < 0) + return WPS_FAILURE; + + if (attr.msg_type == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); + return WPS_FAILURE; + } + + if (*attr.msg_type != WPS_WSC_ACK) { + wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", + *attr.msg_type); + return WPS_FAILURE; + } + + if (attr.registrar_nonce == NULL || + os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) + { + wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); + return WPS_FAILURE; + } + + if (attr.enrollee_nonce == NULL || + os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { + wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); + return WPS_FAILURE; + } + + if (wps->state == RECV_ACK && wps->wps->ap) { + wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " + "completed successfully"); + wps_success_event(wps->wps, wps->peer_dev.mac_addr); + wps->state = WPS_FINISHED; + return WPS_DONE; + } + + return WPS_FAILURE; +} + + +static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, + const struct wpabuf *msg) +{ + struct wps_parse_attr attr; + u16 config_error; + + wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); + + if (wps_parse_msg(msg, &attr) < 0) + return WPS_FAILURE; + + if (attr.msg_type == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); + return WPS_FAILURE; + } + + if (*attr.msg_type != WPS_WSC_NACK) { + wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", + *attr.msg_type); + return WPS_FAILURE; + } + + if (attr.registrar_nonce == NULL || + os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) + { + wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); + wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", + attr.registrar_nonce, WPS_NONCE_LEN); + wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", + wps->nonce_r, WPS_NONCE_LEN); + return WPS_FAILURE; + } + + if (attr.enrollee_nonce == NULL || + os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { + wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); + wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", + attr.enrollee_nonce, WPS_NONCE_LEN); + wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", + wps->nonce_e, WPS_NONCE_LEN); + return WPS_FAILURE; + } + + if (attr.config_error == NULL) { + wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " + "in WSC_NACK"); + return WPS_FAILURE; + } + + config_error = WPA_GET_BE16(attr.config_error); + wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " + "Configuration Error %d", config_error); + + switch (wps->state) { + case RECV_M4: + wps_fail_event(wps->wps, WPS_M3, config_error, + wps->error_indication, wps->peer_dev.mac_addr); + break; + case RECV_M6: + wps_fail_event(wps->wps, WPS_M5, config_error, + wps->error_indication, wps->peer_dev.mac_addr); + break; + case RECV_M8: + wps_fail_event(wps->wps, WPS_M7, config_error, + wps->error_indication, wps->peer_dev.mac_addr); + break; + default: + break; + } + + /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if + * Enrollee is Authenticator */ + wps->state = SEND_WSC_NACK; + + return WPS_FAILURE; +} + + +enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, + enum wsc_op_code op_code, + const struct wpabuf *msg) +{ + + wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " + "op_code=%d)", + (unsigned long) wpabuf_len(msg), op_code); + + if (op_code == WSC_UPnP) { + /* Determine the OpCode based on message type attribute */ + struct wps_parse_attr attr; + if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { + if (*attr.msg_type == WPS_WSC_ACK) + op_code = WSC_ACK; + else if (*attr.msg_type == WPS_WSC_NACK) + op_code = WSC_NACK; + } + } + + switch (op_code) { + case WSC_MSG: + case WSC_UPnP: + return wps_process_wsc_msg(wps, msg); + case WSC_ACK: + if (wps_validate_wsc_ack(msg) < 0) + return WPS_FAILURE; + return wps_process_wsc_ack(wps, msg); + case WSC_NACK: + if (wps_validate_wsc_nack(msg) < 0) + return WPS_FAILURE; + return wps_process_wsc_nack(wps, msg); + default: + wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); + return WPS_FAILURE; + } +} |