diff options
Diffstat (limited to 'contrib/wpa_supplicant/eap_ttls.c')
| -rw-r--r-- | contrib/wpa_supplicant/eap_ttls.c | 1384 |
1 files changed, 1384 insertions, 0 deletions
diff --git a/contrib/wpa_supplicant/eap_ttls.c b/contrib/wpa_supplicant/eap_ttls.c new file mode 100644 index 0000000000000..b639fcd54dc80 --- /dev/null +++ b/contrib/wpa_supplicant/eap_ttls.c @@ -0,0 +1,1384 @@ +/* + * WPA Supplicant / EAP-TTLS (draft-ietf-pppext-eap-ttls-03.txt) + * Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.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 <stdlib.h> +#include <stdio.h> +#include <string.h> + +#include "common.h" +#include "eap_i.h" +#include "eap_tls_common.h" +#include "wpa_supplicant.h" +#include "config_ssid.h" +#include "ms_funcs.h" +#include "md5.h" +#include "tls.h" +#include "eap_ttls.h" + + +static void eap_ttls_deinit(struct eap_sm *sm, void *priv); + + +struct eap_ttls_data { + struct eap_ssl_data ssl; + + const struct eap_method *phase2_method; + void *phase2_priv; + int phase2_success; + int phase2_start; + + enum { + EAP_TTLS_PHASE2_EAP, + EAP_TTLS_PHASE2_MSCHAPV2, + EAP_TTLS_PHASE2_MSCHAP, + EAP_TTLS_PHASE2_PAP, + EAP_TTLS_PHASE2_CHAP + } phase2_type; + u8 phase2_eap_type; + u8 *phase2_eap_types; + size_t num_phase2_eap_types; + + u8 auth_response[20]; + int auth_response_valid; + u8 ident; + int resuming; /* starting a resumed session */ + int reauth; /* reauthentication */ + u8 *key_data; + + u8 *pending_phase2_req; + size_t pending_phase2_req_len; +}; + + +static void * eap_ttls_init(struct eap_sm *sm) +{ + struct eap_ttls_data *data; + struct wpa_ssid *config = eap_get_config(sm); + char *selected; + + data = malloc(sizeof(*data)); + if (data == NULL) + return NULL; + memset(data, 0, sizeof(*data)); + selected = "EAP"; + data->phase2_type = EAP_TTLS_PHASE2_EAP; + if (config && config->phase2) { + if (strstr(config->phase2, "autheap=")) { + selected = "EAP"; + data->phase2_type = EAP_TTLS_PHASE2_EAP; + } else if (strstr(config->phase2, "auth=MSCHAPV2")) { + selected = "MSCHAPV2"; + data->phase2_type = EAP_TTLS_PHASE2_MSCHAPV2; + } else if (strstr(config->phase2, "auth=MSCHAP")) { + selected = "MSCHAP"; + data->phase2_type = EAP_TTLS_PHASE2_MSCHAP; + } else if (strstr(config->phase2, "auth=PAP")) { + selected = "PAP"; + data->phase2_type = EAP_TTLS_PHASE2_PAP; + } else if (strstr(config->phase2, "auth=CHAP")) { + selected = "CHAP"; + data->phase2_type = EAP_TTLS_PHASE2_CHAP; + } + } + wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 type: %s", selected); + + if (data->phase2_type == EAP_TTLS_PHASE2_EAP) { + if (config && config->phase2) { + char *start, *pos, *buf; + u8 method, *methods = NULL, *_methods; + size_t num_methods = 0; + start = buf = strdup(config->phase2); + if (buf == NULL) { + eap_ttls_deinit(sm, data); + return NULL; + } + while (start && *start != '\0') { + pos = strstr(start, "autheap="); + if (pos == NULL) + break; + if (start != pos && *(pos - 1) != ' ') { + start = pos + 8; + continue; + } + + start = pos + 8; + pos = strchr(start, ' '); + if (pos) + *pos++ = '\0'; + method = eap_get_phase2_type(start); + if (method == EAP_TYPE_NONE) { + wpa_printf(MSG_ERROR, "EAP-TTLS: " + "Unsupported Phase2 EAP " + "method '%s'", start); + } else { + num_methods++; + _methods = realloc(methods, + num_methods); + if (_methods == NULL) { + free(methods); + eap_ttls_deinit(sm, data); + return NULL; + } + methods = _methods; + methods[num_methods - 1] = method; + } + + start = pos; + } + free(buf); + data->phase2_eap_types = methods; + data->num_phase2_eap_types = num_methods; + } + if (data->phase2_eap_types == NULL) { + data->phase2_eap_types = eap_get_phase2_types( + config, &data->num_phase2_eap_types); + } + if (data->phase2_eap_types == NULL) { + wpa_printf(MSG_ERROR, "EAP-TTLS: No Phase2 EAP method " + "available"); + eap_ttls_deinit(sm, data); + return NULL; + } + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase2 EAP types", + data->phase2_eap_types, + data->num_phase2_eap_types); + data->phase2_eap_type = EAP_TYPE_NONE; + } + + + if (eap_tls_ssl_init(sm, &data->ssl, config)) { + wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL."); + eap_ttls_deinit(sm, data); + return NULL; + } + + return data; +} + + +static void eap_ttls_deinit(struct eap_sm *sm, void *priv) +{ + struct eap_ttls_data *data = priv; + if (data == NULL) + return; + if (data->phase2_priv && data->phase2_method) + data->phase2_method->deinit(sm, data->phase2_priv); + free(data->phase2_eap_types); + eap_tls_ssl_deinit(sm, &data->ssl); + free(data->key_data); + free(data->pending_phase2_req); + free(data); +} + + +static int eap_ttls_encrypt(struct eap_sm *sm, struct eap_ttls_data *data, + int id, u8 *plain, size_t plain_len, + u8 **out_data, size_t *out_len) +{ + int res; + u8 *pos; + struct eap_hdr *resp; + + /* TODO: add support for fragmentation, if needed. This will need to + * add TLS Message Length field, if the frame is fragmented. */ + resp = malloc(sizeof(struct eap_hdr) + 2 + data->ssl.tls_out_limit); + if (resp == NULL) + return 0; + + resp->code = EAP_CODE_RESPONSE; + resp->identifier = id; + + pos = (u8 *) (resp + 1); + *pos++ = EAP_TYPE_TTLS; + *pos++ = 0; + + res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn, + plain, plain_len, + pos, data->ssl.tls_out_limit); + if (res < 0) { + wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt Phase 2 " + "data"); + free(resp); + return 0; + } + + *out_len = sizeof(struct eap_hdr) + 2 + res; + resp->length = host_to_be16(*out_len); + *out_data = (u8 *) resp; + return 0; +} + + +static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id, + int mandatory, size_t len) +{ + struct ttls_avp_vendor *avp; + u8 flags; + size_t hdrlen; + + avp = (struct ttls_avp_vendor *) avphdr; + flags = mandatory ? AVP_FLAGS_MANDATORY : 0; + if (vendor_id) { + flags |= AVP_FLAGS_VENDOR; + hdrlen = sizeof(*avp); + avp->vendor_id = host_to_be32(vendor_id); + } else { + hdrlen = sizeof(struct ttls_avp); + } + + avp->avp_code = host_to_be32(avp_code); + avp->avp_length = host_to_be32((flags << 24) | (hdrlen + len)); + + return avphdr + hdrlen; +} + + +static u8 * eap_ttls_avp_add(u8 *start, u8 *avphdr, u32 avp_code, + u32 vendor_id, int mandatory, + u8 *data, size_t len) +{ + u8 *pos; + pos = eap_ttls_avp_hdr(avphdr, avp_code, vendor_id, mandatory, len); + memcpy(pos, data, len); + pos += len; + AVP_PAD(start, pos); + return pos; +} + + +static int eap_ttls_avp_encapsulate(u8 **resp, size_t *resp_len, u32 avp_code, + int mandatory) +{ + u8 *avp, *pos; + + avp = malloc(sizeof(struct ttls_avp) + *resp_len + 4); + if (avp == NULL) { + free(*resp); + *resp_len = 0; + return -1; + } + + pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, *resp_len); + memcpy(pos, *resp, *resp_len); + pos += *resp_len; + AVP_PAD(avp, pos); + free(*resp); + *resp = avp; + *resp_len = pos - avp; + return 0; +} + + +static int eap_ttls_phase2_nak(struct eap_sm *sm, + struct eap_ttls_data *data, + struct eap_hdr *hdr, + u8 **resp, size_t *resp_len) +{ + struct eap_hdr *resp_hdr; + u8 *pos = (u8 *) (hdr + 1); + + wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 Request: Nak type=%d", *pos); + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Allowed Phase2 EAP types", + data->phase2_eap_types, data->num_phase2_eap_types); + *resp_len = sizeof(struct eap_hdr) + 1 + data->num_phase2_eap_types; + *resp = malloc(*resp_len); + if (*resp == NULL) + return -1; + + resp_hdr = (struct eap_hdr *) (*resp); + resp_hdr->code = EAP_CODE_RESPONSE; + resp_hdr->identifier = hdr->identifier; + resp_hdr->length = host_to_be16(*resp_len); + pos = (u8 *) (resp_hdr + 1); + *pos++ = EAP_TYPE_NAK; + memcpy(pos, data->phase2_eap_types, data->num_phase2_eap_types); + + return 0; +} + + +static int eap_ttls_phase2_request_eap(struct eap_sm *sm, + struct eap_ttls_data *data, + struct eap_method_ret *ret, + struct eap_hdr *req, + struct eap_hdr *hdr, + u8 **resp, size_t *resp_len) +{ + size_t len = be_to_host16(hdr->length); + u8 *pos; + struct eap_method_ret iret; + struct wpa_ssid *config = eap_get_config(sm); + + if (len <= sizeof(struct eap_hdr)) { + wpa_printf(MSG_INFO, "EAP-TTLS: too short " + "Phase 2 request (len=%lu)", (unsigned long) len); + return -1; + } + pos = (u8 *) (hdr + 1); + wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos); + switch (*pos) { + case EAP_TYPE_IDENTITY: + *resp = eap_sm_buildIdentity(sm, req->identifier, resp_len, 1); + break; + default: + if (data->phase2_eap_type == EAP_TYPE_NONE) { + int i; + for (i = 0; i < data->num_phase2_eap_types; i++) { + if (data->phase2_eap_types[i] != *pos) + continue; + + data->phase2_eap_type = *pos; + wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected " + "Phase 2 EAP method %d", + data->phase2_eap_type); + break; + } + } + if (*pos != data->phase2_eap_type || *pos == EAP_TYPE_NONE) { + if (eap_ttls_phase2_nak(sm, data, hdr, resp, resp_len)) + return -1; + break; + } + + if (data->phase2_priv == NULL) { + data->phase2_method = eap_sm_get_eap_methods(*pos); + if (data->phase2_method) { + sm->init_phase2 = 1; + data->phase2_priv = + data->phase2_method->init(sm); + sm->init_phase2 = 0; + } + } + if (data->phase2_priv == NULL || data->phase2_method == NULL) { + wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize " + "Phase 2 EAP method %d", *pos); + return -1; + } + memset(&iret, 0, sizeof(iret)); + *resp = data->phase2_method->process(sm, data->phase2_priv, + &iret, (u8 *) hdr, len, + resp_len); + if ((iret.methodState == METHOD_DONE || + iret.methodState == METHOD_MAY_CONT) && + (iret.decision == DECISION_UNCOND_SUCC || + iret.decision == DECISION_COND_SUCC || + iret.decision == DECISION_FAIL)) { + ret->methodState = iret.methodState; + ret->decision = iret.decision; + } + break; + } + + if (*resp == NULL && + (config->pending_req_identity || config->pending_req_password || + config->pending_req_otp)) { + return 0; + } + + if (*resp == NULL) + return -1; + + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response", + *resp, *resp_len); + return eap_ttls_avp_encapsulate(resp, resp_len, + RADIUS_ATTR_EAP_MESSAGE, 1); +} + + +static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm, + struct eap_ttls_data *data, + struct eap_method_ret *ret, + struct eap_hdr *req, + struct eap_hdr *hdr, + u8 **resp, size_t *resp_len) +{ + struct wpa_ssid *config = eap_get_config(sm); + u8 *buf, *pos, *challenge, *username, *peer_challenge; + size_t username_len; + int i; + + wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request"); + + /* MSCHAPv2 does not include optional domain name in the + * challenge-response calculation, so remove domain prefix + * (if present). */ + username = config->identity; + username_len = config->identity_len; + pos = username; + for (i = 0; i < username_len; i++) { + if (username[i] == '\\') { + username_len -= i + 1; + username += i + 1; + break; + } + } + + pos = buf = malloc(config->identity_len + 1000); + if (buf == NULL) { + wpa_printf(MSG_ERROR, + "EAP-TTLS/MSCHAPV2: Failed to allocate memory"); + return -1; + } + + /* User-Name */ + pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, + config->identity, config->identity_len); + + /* MS-CHAP-Challenge */ + challenge = eap_tls_derive_key(sm, &data->ssl, "ttls challenge", + EAP_TTLS_MSCHAPV2_CHALLENGE_LEN * 2 + + 1); + if (challenge == NULL) { + free(buf); + wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive " + "implicit challenge"); + return -1; + } + peer_challenge = challenge + 1 + EAP_TTLS_MSCHAPV2_CHALLENGE_LEN; + + pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE, + RADIUS_VENDOR_ID_MICROSOFT, 1, + challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN); + + /* MS-CHAP2-Response */ + pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE, + RADIUS_VENDOR_ID_MICROSOFT, 1, + EAP_TTLS_MSCHAPV2_RESPONSE_LEN); + data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN]; + *pos++ = data->ident; + *pos++ = 0; /* Flags */ + memcpy(pos, peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN); + pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN; + memset(pos, 0, 8); /* Reserved, must be zero */ + pos += 8; + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2: implicit auth_challenge", + challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN); + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2: peer_challenge", + peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN); + wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 username", + username, username_len); + wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 password", + config->password, config->password_len); + generate_nt_response(challenge, peer_challenge, + username, username_len, + config->password, config->password_len, + pos); + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 response", pos, 24); + generate_authenticator_response(config->password, config->password_len, + peer_challenge, challenge, + username, username_len, + pos, data->auth_response); + data->auth_response_valid = 1; + + pos += 24; + free(challenge); + AVP_PAD(buf, pos); + + *resp = buf; + *resp_len = pos - buf; + + if (sm->workaround) { + /* At least FreeRADIUS seems to be terminating + * EAP-TTLS/MSHCAPV2 without the expected MS-CHAP-v2 Success + * packet. */ + wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: EAP workaround - " + "allow success without tunneled response"); + ret->methodState = METHOD_MAY_CONT; + ret->decision = DECISION_COND_SUCC; + } + + return 0; +} + + +static int eap_ttls_phase2_request_mschap(struct eap_sm *sm, + struct eap_ttls_data *data, + struct eap_method_ret *ret, + struct eap_hdr *req, + struct eap_hdr *hdr, + u8 **resp, size_t *resp_len) +{ + struct wpa_ssid *config = eap_get_config(sm); + u8 *buf, *pos, *challenge; + + wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request"); + + pos = buf = malloc(config->identity_len + 1000); + if (buf == NULL) { + wpa_printf(MSG_ERROR, + "EAP-TTLS/MSCHAP: Failed to allocate memory"); + return -1; + } + + /* User-Name */ + pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, + config->identity, config->identity_len); + + /* MS-CHAP-Challenge */ + challenge = eap_tls_derive_key(sm, &data->ssl, "ttls challenge", + EAP_TLS_KEY_LEN); + if (challenge == NULL) { + free(buf); + wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive " + "implicit challenge"); + return -1; + } + + pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE, + RADIUS_VENDOR_ID_MICROSOFT, 1, + challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN); + + /* MS-CHAP-Response */ + pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE, + RADIUS_VENDOR_ID_MICROSOFT, 1, + EAP_TTLS_MSCHAP_RESPONSE_LEN); + data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN]; + *pos++ = data->ident; + *pos++ = 1; /* Flags: Use NT style passwords */ + memset(pos, 0, 24); /* LM-Response */ + pos += 24; + nt_challenge_response(challenge, + config->password, config->password_len, + pos); /* NT-Response */ + wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password", + config->password, config->password_len); + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge", + challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN); + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24); + pos += 24; + free(challenge); + AVP_PAD(buf, pos); + + *resp = buf; + *resp_len = pos - buf; + + /* EAP-TTLS/MSCHAP does not provide tunneled success notification, so + * assume that Phase2 succeeds. */ + ret->methodState = METHOD_DONE; + ret->decision = DECISION_COND_SUCC; + + return 0; +} + + +static int eap_ttls_phase2_request_pap(struct eap_sm *sm, + struct eap_ttls_data *data, + struct eap_method_ret *ret, + struct eap_hdr *req, + struct eap_hdr *hdr, + u8 **resp, size_t *resp_len) +{ + struct wpa_ssid *config = eap_get_config(sm); + u8 *buf, *pos; + size_t pad; + + wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request"); + + pos = buf = malloc(config->identity_len + config->password_len + 100); + if (buf == NULL) { + wpa_printf(MSG_ERROR, + "EAP-TTLS/PAP: Failed to allocate memory"); + return -1; + } + + /* User-Name */ + pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, + config->identity, config->identity_len); + + /* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts + * the data, so no separate encryption is used in the AVP itself. + * However, the password is padded to obfuscate its length. */ + pad = (16 - (config->password_len & 15)) & 15; + pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1, + config->password_len + pad); + memcpy(pos, config->password, config->password_len); + pos += config->password_len; + memset(pos, 0, pad); + pos += pad; + AVP_PAD(buf, pos); + + *resp = buf; + *resp_len = pos - buf; + + /* EAP-TTLS/PAP does not provide tunneled success notification, so + * assume that Phase2 succeeds. */ + ret->methodState = METHOD_DONE; + ret->decision = DECISION_COND_SUCC; + + return 0; +} + + +static int eap_ttls_phase2_request_chap(struct eap_sm *sm, + struct eap_ttls_data *data, + struct eap_method_ret *ret, + struct eap_hdr *req, + struct eap_hdr *hdr, + u8 **resp, size_t *resp_len) +{ + struct wpa_ssid *config = eap_get_config(sm); + u8 *buf, *pos, *challenge; + MD5_CTX context; + + wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request"); + + pos = buf = malloc(config->identity_len + 1000); + if (buf == NULL) { + wpa_printf(MSG_ERROR, + "EAP-TTLS/CHAP: Failed to allocate memory"); + return -1; + } + + /* User-Name */ + pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, + config->identity, config->identity_len); + + /* CHAP-Challenge */ + challenge = eap_tls_derive_key(sm, &data->ssl, "ttls challenge", + EAP_TLS_KEY_LEN); + if (challenge == NULL) { + free(buf); + wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive " + "implicit challenge"); + return -1; + } + + pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1, + challenge, EAP_TTLS_CHAP_CHALLENGE_LEN); + + /* CHAP-Password */ + pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1, + 1 + EAP_TTLS_CHAP_PASSWORD_LEN); + data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN]; + *pos++ = data->ident; + + /* MD5(Ident + Password + Challenge) */ + MD5Init(&context); + MD5Update(&context, &data->ident, 1); + MD5Update(&context, config->password, config->password_len); + MD5Update(&context, challenge, EAP_TTLS_CHAP_CHALLENGE_LEN); + MD5Final(pos, &context); + + wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username", + config->identity, config->identity_len); + wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password", + config->password, config->password_len); + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge", + challenge, EAP_TTLS_CHAP_CHALLENGE_LEN); + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password", + pos, EAP_TTLS_CHAP_PASSWORD_LEN); + pos += EAP_TTLS_CHAP_PASSWORD_LEN; + free(challenge); + AVP_PAD(buf, pos); + + *resp = buf; + *resp_len = pos - buf; + + /* EAP-TTLS/CHAP does not provide tunneled success notification, so + * assume that Phase2 succeeds. */ + ret->methodState = METHOD_DONE; + ret->decision = DECISION_COND_SUCC; + + return 0; +} + + +static int eap_ttls_phase2_request(struct eap_sm *sm, + struct eap_ttls_data *data, + struct eap_method_ret *ret, + struct eap_hdr *req, + struct eap_hdr *hdr, + u8 **resp, size_t *resp_len) +{ + struct wpa_ssid *config = eap_get_config(sm); + int res = 0; + + if (data->phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 || + data->phase2_type == EAP_TTLS_PHASE2_MSCHAP || + data->phase2_type == EAP_TTLS_PHASE2_PAP || + data->phase2_type == EAP_TTLS_PHASE2_CHAP) { + if (config == NULL || config->identity == NULL) { + wpa_printf(MSG_INFO, + "EAP-TTLS: Identity not configured"); + eap_sm_request_identity(sm, config); + if (config->password == NULL) + eap_sm_request_password(sm, config); + return 0; + } + + if (config->password == NULL) { + wpa_printf(MSG_INFO, + "EAP-TTLS: Password not configured"); + eap_sm_request_password(sm, config); + return 0; + } + } + + switch (data->phase2_type) { + case EAP_TTLS_PHASE2_EAP: + res = eap_ttls_phase2_request_eap(sm, data, ret, req, hdr, + resp, resp_len); + break; + case EAP_TTLS_PHASE2_MSCHAPV2: + res = eap_ttls_phase2_request_mschapv2(sm, data, ret, req, hdr, + resp, resp_len); + break; + case EAP_TTLS_PHASE2_MSCHAP: + res = eap_ttls_phase2_request_mschap(sm, data, ret, req, hdr, + resp, resp_len); + break; + case EAP_TTLS_PHASE2_PAP: + res = eap_ttls_phase2_request_pap(sm, data, ret, req, hdr, + resp, resp_len); + break; + case EAP_TTLS_PHASE2_CHAP: + res = eap_ttls_phase2_request_chap(sm, data, ret, req, hdr, + resp, resp_len); + break; + default: + wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown"); + res = -1; + break; + } + + if (res < 0) { + ret->methodState = METHOD_DONE; + ret->decision = DECISION_FAIL; + } + + return res; +} + + +static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data, + struct eap_method_ret *ret, struct eap_hdr *req, + u8 *in_data, size_t in_len, + u8 **out_data, size_t *out_len) +{ + u8 *in_decrypted = NULL, *pos; + int buf_len, len_decrypted = 0, len, left, retval = 0, res; + struct eap_hdr *hdr = NULL; + u8 *resp = NULL, *mschapv2 = NULL, *eapdata = NULL; + size_t resp_len, eap_len = 0; + struct ttls_avp *avp; + u8 recv_response[20]; + int mschapv2_error = 0; + struct wpa_ssid *config = eap_get_config(sm); + + wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for" + " Phase 2", (unsigned long) in_len); + + if (data->pending_phase2_req) { + wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - " + "skip decryption and use old data"); + in_decrypted = data->pending_phase2_req; + data->pending_phase2_req = NULL; + len_decrypted = data->pending_phase2_req_len; + if (data->pending_phase2_req_len == 0) { + free(in_decrypted); + in_decrypted = NULL; + goto fake_req_identity; + } + goto continue_req; + } + + if (in_len == 0 && data->phase2_start) { + data->phase2_start = 0; + /* EAP-TTLS does not use Phase2 on fast re-auth; this must be + * done only if TLS part was indeed resuming a previous + * session. Most Authentication Servers terminate EAP-TTLS + * before reaching this point, but some do not. Make + * wpa_supplicant stop phase 2 here, if needed. */ + if (data->reauth && + tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) { + wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - " + "skip phase 2"); + *out_data = eap_tls_build_ack(&data->ssl, out_len, + req->identifier, + EAP_TYPE_TTLS, 0); + ret->methodState = METHOD_DONE; + ret->decision = DECISION_UNCOND_SUCC; + data->phase2_success = 1; + return 0; + } + fake_req_identity: + wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of " + "Phase 2 - use fake EAP-Request Identity"); + buf_len = sizeof(*hdr) + 1; + in_decrypted = malloc(buf_len); + if (in_decrypted == NULL) { + wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate " + "memory for fake EAP-Identity Request"); + retval = -1; + goto done; + } + hdr = (struct eap_hdr *) in_decrypted; + hdr->code = EAP_CODE_REQUEST; + hdr->identifier = 0; + hdr->length = host_to_be16(sizeof(*hdr) + 1); + in_decrypted[sizeof(*hdr)] = EAP_TYPE_IDENTITY; + goto process_eap; + } + + res = eap_tls_data_reassemble(sm, &data->ssl, &in_data, &in_len); + if (res < 0 || res == 1) { + retval = res; + goto done; + } + + buf_len = in_len; + if (data->ssl.tls_in_total > buf_len) + buf_len = data->ssl.tls_in_total; + in_decrypted = malloc(buf_len); + if (in_decrypted == NULL) { + free(data->ssl.tls_in); + data->ssl.tls_in = NULL; + data->ssl.tls_in_len = 0; + wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate memory " + "for decryption"); + retval = -1; + goto done; + } + + len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn, + in_data, in_len, + in_decrypted, buf_len); + free(data->ssl.tls_in); + data->ssl.tls_in = NULL; + data->ssl.tls_in_len = 0; + if (len_decrypted < 0) { + wpa_printf(MSG_INFO, "EAP-TTLS: Failed to decrypt Phase 2 " + "data"); + retval = -1; + goto done; + } + +continue_req: + data->phase2_start = 0; + + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs", + in_decrypted, len_decrypted); + if (len_decrypted < sizeof(struct ttls_avp)) { + wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame" + " len=%d expected %lu or more - dropped", + len_decrypted, + (unsigned long) sizeof(struct ttls_avp)); + retval = -1; + goto done; + } + + /* Parse AVPs */ + pos = in_decrypted; + left = len_decrypted; + mschapv2 = NULL; + + while (left > 0) { + u32 avp_code, avp_length, vendor_id = 0; + u8 avp_flags, *dpos; + size_t pad, dlen; + avp = (struct ttls_avp *) pos; + avp_code = be_to_host32(avp->avp_code); + avp_length = be_to_host32(avp->avp_length); + avp_flags = (avp_length >> 24) & 0xff; + avp_length &= 0xffffff; + wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x " + "length=%d", (int) avp_code, avp_flags, + (int) avp_length); + if (avp_length > left) { + wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow " + "(len=%d, left=%d) - dropped", + (int) avp_length, left); + retval = -1; + goto done; + } + dpos = (u8 *) (avp + 1); + dlen = avp_length - sizeof(*avp); + if (avp_flags & AVP_FLAGS_VENDOR) { + if (dlen < 4) { + wpa_printf(MSG_WARNING, "EAP-TTLS: vendor AVP " + "underflow"); + retval = -1; + goto done; + } + vendor_id = be_to_host32(* (u32 *) dpos); + wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d", + (int) vendor_id); + dpos += 4; + dlen -= 4; + } + + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen); + + if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) { + wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message"); + if (eapdata == NULL) { + eapdata = malloc(dlen); + if (eapdata == NULL) { + retval = -1; + wpa_printf(MSG_WARNING, "EAP-TTLS: " + "failed to allocate memory " + "for Phase 2 EAP data"); + goto done; + } + memcpy(eapdata, dpos, dlen); + eap_len = dlen; + } else { + u8 *neweap = realloc(eapdata, eap_len + dlen); + if (neweap == NULL) { + retval = -1; + wpa_printf(MSG_WARNING, "EAP-TTLS: " + "failed to allocate memory " + "for Phase 2 EAP data"); + goto done; + } + memcpy(neweap + eap_len, dpos, dlen); + eapdata = neweap; + eap_len += dlen; + } + } else if (vendor_id == 0 && + avp_code == RADIUS_ATTR_REPLY_MESSAGE) { + /* This is an optional message that can be displayed to + * the user. */ + wpa_hexdump_ascii(MSG_DEBUG, + "EAP-TTLS: AVP - Reply-Message", + dpos, dlen); + } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT && + avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) { + wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: " + "MS-CHAP2-Success", dpos, dlen); + if (dlen != 43) { + wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected " + "MS-CHAP2-Success length " + "(len=%lu, expected 43)", + (unsigned long) dlen); + retval = -1; + break; + } + mschapv2 = dpos; + } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT && + avp_code == RADIUS_ATTR_MS_CHAP_ERROR) { + wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: " + "MS-CHAP-Error", dpos, dlen); + mschapv2_error = 1; + } else if (avp_flags & AVP_FLAGS_MANDATORY) { + wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported " + "mandatory AVP code %d vendor_id %d - " + "dropped", (int) avp_code, (int) vendor_id); + retval = -1; + goto done; + } else { + wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported " + "AVP code %d vendor_id %d", + (int) avp_code, (int) vendor_id); + } + + pad = (4 - (avp_length & 3)) & 3; + pos += avp_length + pad; + left -= avp_length + pad; + } + + switch (data->phase2_type) { + case EAP_TTLS_PHASE2_EAP: + if (eapdata == NULL) { + wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in " + "the packet - dropped"); + retval = -1; + goto done; + } + + wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP", + eapdata, eap_len); + hdr = (struct eap_hdr *) eapdata; + + if (eap_len < sizeof(*hdr)) { + wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 " + "EAP frame (len=%lu, expected %lu or more) " + "- dropped", (unsigned long) eap_len, + (unsigned long) sizeof(*hdr)); + retval = -1; + goto done; + } + len = be_to_host16(hdr->length); + if (len > eap_len) { + wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in " + "Phase 2 EAP frame (EAP hdr len=%d, EAP " + "data len in AVP=%lu)", len, + (unsigned long) eap_len); + retval = -1; + goto done; + } + wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d " + "identifier=%d length=%d", + hdr->code, hdr->identifier, len); + process_eap: + switch (hdr->code) { + case EAP_CODE_REQUEST: + if (eap_ttls_phase2_request(sm, data, ret, req, hdr, + &resp, &resp_len)) { + wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 " + "Request processing failed"); + retval = -1; + goto done; + } + break; + default: + wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in " + "Phase 2 EAP header", hdr->code); + retval = -1; + break; + } + break; + case EAP_TTLS_PHASE2_MSCHAPV2: + if (mschapv2_error) { + wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received " + "MS-CHAP-Error - failed"); + ret->methodState = METHOD_DONE; + ret->decision = DECISION_FAIL; + *out_data = eap_tls_build_ack(&data->ssl, out_len, + req->identifier, + EAP_TYPE_TTLS, 0); + break; + } + + if (mschapv2 == NULL) { + wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success" + " AVP received for Phase2 MSCHAPV2"); + retval = -1; + break; + } + if (mschapv2[0] != data->ident) { + wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch " + "for Phase 2 MSCHAPV2 (received Ident " + "0x%02x, expected 0x%02x)", + mschapv2[0], data->ident); + retval = -1; + break; + } + if (!data->auth_response_valid || + mschapv2[1] != 'S' || mschapv2[2] != '=' || + hexstr2bin((char *) (mschapv2 + 3), recv_response, 20) || + memcmp(data->auth_response, recv_response, 20) != 0) { + wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid " + "authenticator response in Phase 2 " + "MSCHAPV2 success request"); + retval = -1; + break; + } + + wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 " + "authentication succeeded"); + ret->methodState = METHOD_DONE; + ret->decision = DECISION_UNCOND_SUCC; + data->phase2_success = 1; + + /* Reply with empty data; authentication server will reply + * with EAP-Success after this. */ + retval = 1; + goto done; + case EAP_TTLS_PHASE2_MSCHAP: + case EAP_TTLS_PHASE2_PAP: + case EAP_TTLS_PHASE2_CHAP: + /* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled + * requests to the supplicant */ + wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected " + "tunneled data"); + retval = -1; + break; + } + + if (resp) { + wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data", + resp, resp_len); + + if (eap_ttls_encrypt(sm, data, req->identifier, + resp, resp_len, out_data, out_len)) { + wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt " + "a Phase 2 frame"); + } + free(resp); + } else if (config->pending_req_identity || + config->pending_req_password || + config->pending_req_otp) { + free(data->pending_phase2_req); + data->pending_phase2_req = malloc(len_decrypted); + if (data->pending_phase2_req) { + memcpy(data->pending_phase2_req, in_decrypted, + len_decrypted); + data->pending_phase2_req_len = len_decrypted; + } + } + +done: + free(in_decrypted); + free(eapdata); + + if (retval < 0) { + ret->methodState = METHOD_DONE; + ret->decision = DECISION_FAIL; + } + + return retval; +} + + +static u8 * eap_ttls_process(struct eap_sm *sm, void *priv, + struct eap_method_ret *ret, + u8 *reqData, size_t reqDataLen, + size_t *respDataLen) +{ + struct eap_hdr *req; + int left, res; + unsigned int tls_msg_len; + u8 flags, *pos, *resp, id; + struct eap_ttls_data *data = priv; + + if (tls_get_errors(sm->ssl_ctx)) { + wpa_printf(MSG_INFO, "EAP-TTLS: TLS errors detected"); + ret->ignore = TRUE; + return NULL; + } + + req = (struct eap_hdr *) reqData; + pos = (u8 *) (req + 1); + if (reqDataLen < sizeof(*req) + 2 || *pos != EAP_TYPE_TTLS || + (left = be_to_host16(req->length)) > reqDataLen) { + wpa_printf(MSG_INFO, "EAP-TTLS: Invalid frame"); + ret->ignore = TRUE; + return NULL; + } + left -= sizeof(struct eap_hdr); + id = req->identifier; + pos++; + flags = *pos++; + left -= 2; + wpa_printf(MSG_DEBUG, "EAP-TTLS: Received packet(len=%lu) - " + "Flags 0x%02x", (unsigned long) reqDataLen, flags); + if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) { + if (left < 4) { + wpa_printf(MSG_INFO, "EAP-TTLS: Short frame with TLS " + "length"); + ret->ignore = TRUE; + return NULL; + } + tls_msg_len = (pos[0] << 24) | (pos[1] << 16) | (pos[2] << 8) | + pos[3]; + wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS Message Length: %d", + tls_msg_len); + if (data->ssl.tls_in_left == 0) { + data->ssl.tls_in_total = tls_msg_len; + data->ssl.tls_in_left = tls_msg_len; + free(data->ssl.tls_in); + data->ssl.tls_in = NULL; + data->ssl.tls_in_len = 0; + } + pos += 4; + left -= 4; + } + + ret->ignore = FALSE; + ret->methodState = METHOD_CONT; + ret->decision = DECISION_FAIL; + ret->allowNotifications = TRUE; + + if (flags & EAP_TLS_FLAGS_START) { + wpa_printf(MSG_DEBUG, "EAP-TTLS: Start"); + /* draft-ietf-pppext-eap-ttls-03.txt, Ch. 8.1: + * EAP-TTLS Start packet may, in a future specification, be + * allowed to contain data. Client based on this draft version + * must ignore such data but must not reject the Start packet. + */ + left = 0; + } + + resp = NULL; + if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && + !data->resuming) { + res = eap_ttls_decrypt(sm, data, ret, req, pos, left, + &resp, respDataLen); + } else { + res = eap_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS, 0, + id, pos, left, + &resp, respDataLen); + + if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { + wpa_printf(MSG_DEBUG, + "EAP-TTLS: TLS done, proceed to Phase 2"); + if (data->resuming) { + wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth -" + " may skip Phase 2"); + ret->decision = DECISION_COND_SUCC; + ret->methodState = METHOD_MAY_CONT; + } + data->phase2_start = 1; + free(data->key_data); + data->key_data = + eap_tls_derive_key(sm, &data->ssl, + "ttls keying material", + EAP_TLS_KEY_LEN); + if (data->key_data) { + wpa_hexdump_key(MSG_DEBUG, + "EAP-TTLS: Derived key", + data->key_data, + EAP_TLS_KEY_LEN); + } else { + wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to " + "derive key"); + } + + if (*respDataLen == 0) { + if (eap_ttls_decrypt(sm, data, ret, req, NULL, + 0, &resp, respDataLen)) { + wpa_printf(MSG_WARNING, "EAP-TTLS: " + "failed to process early " + "start for Phase 2"); + } + res = 0; + } + data->resuming = 0; + } + } + + if (ret->methodState == METHOD_DONE) { + ret->allowNotifications = FALSE; + if (ret->decision == DECISION_UNCOND_SUCC || + ret->decision == DECISION_COND_SUCC) { + wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication " + "completed successfully"); + data->phase2_success = 1; + } + } else if (sm->workaround && ret->methodState == METHOD_MAY_CONT && + (ret->decision == DECISION_UNCOND_SUCC || + ret->decision == DECISION_COND_SUCC)) { + wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication " + "completed successfully (EAP workaround)"); + data->phase2_success = 1; + } + + if (res == 1) { + return eap_tls_build_ack(&data->ssl, respDataLen, id, + EAP_TYPE_TTLS, 0); + } + return resp; +} + + +static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv) +{ + struct eap_ttls_data *data = priv; + return tls_connection_established(sm->ssl_ctx, data->ssl.conn) && + data->phase2_success; +} + + +static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv) +{ + struct eap_ttls_data *data = priv; + free(data->pending_phase2_req); + data->pending_phase2_req = NULL; +} + + +static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv) +{ + struct eap_ttls_data *data = priv; + free(data->key_data); + data->key_data = NULL; + if (eap_tls_reauth_init(sm, &data->ssl)) { + free(data); + return NULL; + } + data->phase2_start = 0; + data->phase2_success = 0; + data->resuming = 1; + data->reauth = 1; + return priv; +} + + +static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf, + size_t buflen, int verbose) +{ + struct eap_ttls_data *data = priv; + int len; + + len = eap_tls_status(sm, &data->ssl, buf, buflen, verbose); + switch (data->phase2_type) { + case EAP_TTLS_PHASE2_EAP: + len += snprintf(buf + len, buflen - len, + "EAP-TTLS Phase2 method=EAP-%s\n", + data->phase2_method ? data->phase2_method->name + : "?"); + break; + case EAP_TTLS_PHASE2_MSCHAPV2: + len += snprintf(buf + len, buflen - len, + "EAP-TTLS Phase2 method=MSCHAPV2\n"); + break; + case EAP_TTLS_PHASE2_MSCHAP: + len += snprintf(buf + len, buflen - len, + "EAP-TTLS Phase2 method=MSCHAP\n"); + break; + case EAP_TTLS_PHASE2_PAP: + len += snprintf(buf + len, buflen - len, + "EAP-TTLS Phase2 method=PAP\n"); + break; + case EAP_TTLS_PHASE2_CHAP: + len += snprintf(buf + len, buflen - len, + "EAP-TTLS Phase2 method=CHAP\n"); + break; + } + + return len; +} + + +static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv) +{ + struct eap_ttls_data *data = priv; + return data->key_data != NULL && data->phase2_success; +} + + +static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len) +{ + struct eap_ttls_data *data = priv; + u8 *key; + + if (data->key_data == NULL || !data->phase2_success) + return NULL; + + key = malloc(EAP_TLS_KEY_LEN); + if (key == NULL) + return NULL; + + *len = EAP_TLS_KEY_LEN; + memcpy(key, data->key_data, EAP_TLS_KEY_LEN); + + return key; +} + + +const struct eap_method eap_method_ttls = +{ + .method = EAP_TYPE_TTLS, + .name = "TTLS", + .init = eap_ttls_init, + .deinit = eap_ttls_deinit, + .process = eap_ttls_process, + .isKeyAvailable = eap_ttls_isKeyAvailable, + .getKey = eap_ttls_getKey, + .get_status = eap_ttls_get_status, + .has_reauth_data = eap_ttls_has_reauth_data, + .deinit_for_reauth = eap_ttls_deinit_for_reauth, + .init_for_reauth = eap_ttls_init_for_reauth, +}; |