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authorJouni Malinen <j@w1.fi>2008-02-28 01:34:43 (GMT)
committerJouni Malinen <jm@jm.kir.nu>2008-02-28 01:34:43 (GMT)
commit6fc6879bd55a394f807cbbe927df736c190cb8ab (patch)
treecdf50da0c58f21510a808d53502a060d911ff243 /src/eap_peer/eap_fast.c
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Re-initialize hostapd/wpa_supplicant git repository based on 0.6.3 release
Diffstat (limited to 'src/eap_peer/eap_fast.c')
-rw-r--r--src/eap_peer/eap_fast.c1859
1 files changed, 1859 insertions, 0 deletions
diff --git a/src/eap_peer/eap_fast.c b/src/eap_peer/eap_fast.c
new file mode 100644
index 0000000..caca89e
--- /dev/null
+++ b/src/eap_peer/eap_fast.c
@@ -0,0 +1,1859 @@
+/*
+ * EAP peer method: EAP-FAST (RFC 4851)
+ * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "eap_i.h"
+#include "eap_tls_common.h"
+#include "eap_config.h"
+#include "tls.h"
+#include "eap_tlv.h"
+#include "sha1.h"
+#include "eap_fast_pac.h"
+
+#ifdef EAP_FAST_DYNAMIC
+#include "eap_fast_pac.c"
+#endif /* EAP_FAST_DYNAMIC */
+
+/* TODO:
+ * - test session resumption and enable it if it interoperates
+ * - password change (pending mschapv2 packet; replay decrypted packet)
+ */
+
+
+static void eap_fast_deinit(struct eap_sm *sm, void *priv);
+
+
+struct eap_fast_data {
+ struct eap_ssl_data ssl;
+
+ int fast_version;
+
+ const struct eap_method *phase2_method;
+ void *phase2_priv;
+ int phase2_success;
+
+ struct eap_method_type phase2_type;
+ struct eap_method_type *phase2_types;
+ size_t num_phase2_types;
+ int resuming; /* starting a resumed session */
+ struct eap_fast_key_block_provisioning *key_block_p;
+#define EAP_FAST_PROV_UNAUTH 1
+#define EAP_FAST_PROV_AUTH 2
+ int provisioning_allowed; /* Allowed PAC provisioning modes */
+ int provisioning; /* doing PAC provisioning (not the normal auth) */
+ int anon_provisioning; /* doing anonymous (unauthenticated)
+ * provisioning */
+ int session_ticket_used;
+
+ u8 key_data[EAP_FAST_KEY_LEN];
+ u8 emsk[EAP_EMSK_LEN];
+ int success;
+
+ struct eap_fast_pac *pac;
+ struct eap_fast_pac *current_pac;
+ size_t max_pac_list_len;
+ int use_pac_binary_format;
+
+ u8 simck[EAP_FAST_SIMCK_LEN];
+ int simck_idx;
+
+ struct wpabuf *pending_phase2_req;
+};
+
+
+static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
+ const u8 *client_random,
+ const u8 *server_random,
+ u8 *master_secret)
+{
+ struct eap_fast_data *data = ctx;
+#define TLS_RANDOM_LEN 32
+#define TLS_MASTER_SECRET_LEN 48
+ u8 seed[2 * TLS_RANDOM_LEN];
+
+ wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
+
+ if (client_random == NULL || server_random == NULL ||
+ master_secret == NULL) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
+ "back to full TLS handshake");
+ data->session_ticket_used = 0;
+ if (data->provisioning_allowed) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
+ "new PAC-Key");
+ data->provisioning = 1;
+ data->current_pac = NULL;
+ }
+ return 0;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
+ wpa_hexdump(MSG_DEBUG, "EAP-FAST: client_random",
+ client_random, TLS_RANDOM_LEN);
+ wpa_hexdump(MSG_DEBUG, "EAP-FAST: server_random",
+ server_random, TLS_RANDOM_LEN);
+
+ if (data->current_pac == NULL) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
+ "using SessionTicket");
+ data->session_ticket_used = 0;
+ return 0;
+ }
+
+ /*
+ * RFC 4851, Section 5.1:
+ * master_secret = T-PRF(PAC-Key, "PAC to master secret label hash",
+ * server_random + client_random, 48)
+ */
+ os_memcpy(seed, server_random, TLS_RANDOM_LEN);
+ os_memcpy(seed + TLS_RANDOM_LEN, client_random, TLS_RANDOM_LEN);
+ sha1_t_prf(data->current_pac->pac_key, EAP_FAST_PAC_KEY_LEN,
+ "PAC to master secret label hash",
+ seed, sizeof(seed), master_secret, TLS_MASTER_SECRET_LEN);
+
+ wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: master_secret",
+ master_secret, TLS_MASTER_SECRET_LEN);
+
+ data->session_ticket_used = 1;
+
+ return 1;
+}
+
+
+static int eap_fast_parse_phase1(struct eap_fast_data *data,
+ const char *phase1)
+{
+ const char *pos;
+
+ pos = os_strstr(phase1, "fast_provisioning=");
+ if (pos) {
+ data->provisioning_allowed = atoi(pos + 18);
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
+ "mode: %d", data->provisioning_allowed);
+ }
+
+ pos = os_strstr(phase1, "fast_max_pac_list_len=");
+ if (pos) {
+ data->max_pac_list_len = atoi(pos + 22);
+ if (data->max_pac_list_len == 0)
+ data->max_pac_list_len = 1;
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
+ (unsigned long) data->max_pac_list_len);
+ }
+
+ pos = os_strstr(phase1, "fast_pac_format=binary");
+ if (pos) {
+ data->use_pac_binary_format = 1;
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
+ "list");
+ }
+
+ return 0;
+}
+
+
+static void * eap_fast_init(struct eap_sm *sm)
+{
+ struct eap_fast_data *data;
+ struct eap_peer_config *config = eap_get_config(sm);
+
+ data = os_zalloc(sizeof(*data));
+ if (data == NULL)
+ return NULL;
+ data->fast_version = EAP_FAST_VERSION;
+ data->max_pac_list_len = 10;
+
+ if (config && config->phase1 &&
+ eap_fast_parse_phase1(data, config->phase1) < 0) {
+ eap_fast_deinit(sm, data);
+ return NULL;
+ }
+
+ if (eap_peer_select_phase2_methods(config, "auth=",
+ &data->phase2_types,
+ &data->num_phase2_types) < 0) {
+ eap_fast_deinit(sm, data);
+ return NULL;
+ }
+
+ data->phase2_type.vendor = EAP_VENDOR_IETF;
+ data->phase2_type.method = EAP_TYPE_NONE;
+
+ if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
+ eap_fast_deinit(sm, data);
+ return NULL;
+ }
+
+ if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
+ eap_fast_session_ticket_cb,
+ data) < 0) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
+ "callback");
+ eap_fast_deinit(sm, data);
+ return NULL;
+ }
+
+ /*
+ * The local RADIUS server in a Cisco AP does not seem to like empty
+ * fragments before data, so disable that workaround for CBC.
+ * TODO: consider making this configurable
+ */
+ if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
+ "workarounds");
+ }
+
+ if (data->use_pac_binary_format &&
+ eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
+ eap_fast_deinit(sm, data);
+ return NULL;
+ }
+
+ if (!data->use_pac_binary_format &&
+ eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
+ eap_fast_deinit(sm, data);
+ return NULL;
+ }
+ eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
+
+ if (data->pac == NULL && !data->provisioning_allowed) {
+ wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
+ "provisioning disabled");
+ eap_fast_deinit(sm, data);
+ return NULL;
+ }
+
+ return data;
+}
+
+
+static void eap_fast_deinit(struct eap_sm *sm, void *priv)
+{
+ struct eap_fast_data *data = priv;
+ struct eap_fast_pac *pac, *prev;
+
+ if (data == NULL)
+ return;
+ if (data->phase2_priv && data->phase2_method)
+ data->phase2_method->deinit(sm, data->phase2_priv);
+ os_free(data->phase2_types);
+ os_free(data->key_block_p);
+ eap_peer_tls_ssl_deinit(sm, &data->ssl);
+
+ pac = data->pac;
+ prev = NULL;
+ while (pac) {
+ prev = pac;
+ pac = pac->next;
+ eap_fast_free_pac(prev);
+ }
+ wpabuf_free(data->pending_phase2_req);
+ os_free(data);
+}
+
+
+static int eap_fast_derive_msk(struct eap_fast_data *data)
+{
+ /* Derive EAP Master Session Keys (section 5.4) */
+ sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
+ "Session Key Generating Function", (u8 *) "", 0,
+ data->key_data, EAP_FAST_KEY_LEN);
+ wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Derived key (MSK)",
+ data->key_data, EAP_FAST_KEY_LEN);
+
+ sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
+ "Extended Session Key Generating Function",
+ (u8 *) "", 0, data->emsk, EAP_EMSK_LEN);
+ wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Derived key (EMSK)",
+ data->emsk, EAP_EMSK_LEN);
+
+ data->success = 1;
+
+ return 0;
+}
+
+
+static u8 * eap_fast_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
+ char *label, size_t len)
+{
+ struct tls_keys keys;
+ u8 *rnd = NULL, *out;
+ int block_size;
+
+ block_size = tls_connection_get_keyblock_size(sm->ssl_ctx, data->conn);
+ if (block_size < 0)
+ return NULL;
+
+ out = os_malloc(block_size + len);
+ if (out == NULL)
+ return NULL;
+
+ if (tls_connection_prf(sm->ssl_ctx, data->conn, label, 1, out,
+ block_size + len) == 0) {
+ os_memmove(out, out + block_size, len);
+ return out;
+ }
+
+ if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys))
+ goto fail;
+
+ rnd = os_malloc(keys.client_random_len + keys.server_random_len);
+ if (rnd == NULL)
+ goto fail;
+
+ os_memcpy(rnd, keys.server_random, keys.server_random_len);
+ os_memcpy(rnd + keys.server_random_len, keys.client_random,
+ keys.client_random_len);
+
+ wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: master_secret for key "
+ "expansion", keys.master_key, keys.master_key_len);
+ if (tls_prf(keys.master_key, keys.master_key_len,
+ label, rnd, keys.client_random_len +
+ keys.server_random_len, out, block_size + len))
+ goto fail;
+ os_free(rnd);
+ os_memmove(out, out + block_size, len);
+ return out;
+
+fail:
+ os_free(rnd);
+ os_free(out);
+ return NULL;
+}
+
+
+static void eap_fast_derive_key_auth(struct eap_sm *sm,
+ struct eap_fast_data *data)
+{
+ u8 *sks;
+
+ /* RFC 4851, Section 5.1:
+ * Extra key material after TLS key_block: session_key_seed[40]
+ */
+
+ sks = eap_fast_derive_key(sm, &data->ssl, "key expansion",
+ EAP_FAST_SKS_LEN);
+ if (sks == NULL) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
+ "session_key_seed");
+ return;
+ }
+
+ /*
+ * RFC 4851, Section 5.2:
+ * S-IMCK[0] = session_key_seed
+ */
+ wpa_hexdump_key(MSG_DEBUG,
+ "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
+ sks, EAP_FAST_SKS_LEN);
+ data->simck_idx = 0;
+ os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
+ os_free(sks);
+}
+
+
+static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
+ struct eap_fast_data *data)
+{
+ os_free(data->key_block_p);
+ data->key_block_p = (struct eap_fast_key_block_provisioning *)
+ eap_fast_derive_key(sm, &data->ssl, "key expansion",
+ sizeof(*data->key_block_p));
+ if (data->key_block_p == NULL) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
+ return;
+ }
+ /*
+ * RFC 4851, Section 5.2:
+ * S-IMCK[0] = session_key_seed
+ */
+ wpa_hexdump_key(MSG_DEBUG,
+ "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
+ data->key_block_p->session_key_seed,
+ sizeof(data->key_block_p->session_key_seed));
+ data->simck_idx = 0;
+ os_memcpy(data->simck, data->key_block_p->session_key_seed,
+ EAP_FAST_SIMCK_LEN);
+ wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
+ data->key_block_p->server_challenge,
+ sizeof(data->key_block_p->server_challenge));
+ wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
+ data->key_block_p->client_challenge,
+ sizeof(data->key_block_p->client_challenge));
+}
+
+
+static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
+{
+ if (data->anon_provisioning)
+ eap_fast_derive_key_provisioning(sm, data);
+ else
+ eap_fast_derive_key_auth(sm, data);
+}
+
+
+static int eap_fast_init_phase2_method(struct eap_sm *sm,
+ struct eap_fast_data *data)
+{
+ data->phase2_method =
+ eap_peer_get_eap_method(data->phase2_type.vendor,
+ data->phase2_type.method);
+ if (data->phase2_method == NULL)
+ return -1;
+
+ if (data->key_block_p) {
+ sm->auth_challenge = data->key_block_p->server_challenge;
+ sm->peer_challenge = data->key_block_p->client_challenge;
+ }
+ sm->init_phase2 = 1;
+ sm->mschapv2_full_key = 1;
+ data->phase2_priv = data->phase2_method->init(sm);
+ sm->init_phase2 = 0;
+ sm->mschapv2_full_key = 0;
+ sm->auth_challenge = NULL;
+ sm->peer_challenge = NULL;
+
+ return data->phase2_priv == NULL ? -1 : 0;
+}
+
+
+static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
+{
+ size_t i;
+
+ if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
+ "during unauthenticated provisioning; reject phase2"
+ " type %d", type);
+ return -1;
+ }
+
+ for (i = 0; i < data->num_phase2_types; i++) {
+ if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
+ data->phase2_types[i].method != type)
+ continue;
+
+ data->phase2_type.vendor = data->phase2_types[i].vendor;
+ data->phase2_type.method = data->phase2_types[i].method;
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
+ "vendor %d method %d",
+ data->phase2_type.vendor,
+ data->phase2_type.method);
+ break;
+ }
+
+ if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
+ return -1;
+
+ return 0;
+}
+
+
+static int eap_fast_phase2_request(struct eap_sm *sm,
+ struct eap_fast_data *data,
+ struct eap_method_ret *ret,
+ struct eap_hdr *hdr,
+ struct wpabuf **resp)
+{
+ size_t len = be_to_host16(hdr->length);
+ u8 *pos;
+ struct eap_method_ret iret;
+ struct eap_peer_config *config = eap_get_config(sm);
+ struct wpabuf msg;
+
+ if (len <= sizeof(struct eap_hdr)) {
+ wpa_printf(MSG_INFO, "EAP-FAST: too short "
+ "Phase 2 request (len=%lu)", (unsigned long) len);
+ return -1;
+ }
+ pos = (u8 *) (hdr + 1);
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
+ if (*pos == EAP_TYPE_IDENTITY) {
+ *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
+ return 0;
+ }
+
+ if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
+ data->phase2_type.method == EAP_TYPE_NONE &&
+ eap_fast_select_phase2_method(data, *pos) < 0) {
+ if (eap_peer_tls_phase2_nak(data->phase2_types,
+ data->num_phase2_types,
+ hdr, resp))
+ return -1;
+ return 0;
+ }
+
+ if (data->phase2_priv == NULL &&
+ eap_fast_init_phase2_method(sm, data) < 0) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
+ "Phase 2 EAP method %d", *pos);
+ ret->methodState = METHOD_DONE;
+ ret->decision = DECISION_FAIL;
+ return -1;
+ }
+
+ os_memset(&iret, 0, sizeof(iret));
+ wpabuf_set(&msg, hdr, len);
+ *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
+ &msg);
+ if (*resp == NULL ||
+ (iret.methodState == METHOD_DONE &&
+ iret.decision == DECISION_FAIL)) {
+ ret->methodState = METHOD_DONE;
+ ret->decision = DECISION_FAIL;
+ } else if ((iret.methodState == METHOD_DONE ||
+ iret.methodState == METHOD_MAY_CONT) &&
+ (iret.decision == DECISION_UNCOND_SUCC ||
+ iret.decision == DECISION_COND_SUCC)) {
+ data->phase2_success = 1;
+ }
+
+ if (*resp == NULL && config &&
+ (config->pending_req_identity || config->pending_req_password ||
+ config->pending_req_otp || config->pending_req_new_password)) {
+ wpabuf_free(data->pending_phase2_req);
+ data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
+ } else if (*resp == NULL)
+ return -1;
+
+ return 0;
+}
+
+
+static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
+{
+ struct wpabuf *buf;
+ struct eap_tlv_nak_tlv *nak;
+ buf = wpabuf_alloc(sizeof(*nak));
+ if (buf == NULL)
+ return NULL;
+ nak = wpabuf_put(buf, sizeof(*nak));
+ nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
+ nak->length = host_to_be16(6);
+ nak->vendor_id = host_to_be32(vendor_id);
+ nak->nak_type = host_to_be16(tlv_type);
+ return buf;
+}
+
+
+static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
+{
+ struct wpabuf *buf;
+ struct eap_tlv_intermediate_result_tlv *result;
+ buf = wpabuf_alloc(sizeof(*result));
+ if (buf == NULL)
+ return NULL;
+ result = wpabuf_put(buf, sizeof(*result));
+ result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
+ (intermediate ?
+ EAP_TLV_INTERMEDIATE_RESULT_TLV :
+ EAP_TLV_RESULT_TLV));
+ result->length = host_to_be16(2);
+ result->status = host_to_be16(status);
+ return buf;
+}
+
+
+static struct wpabuf * eap_fast_tlv_pac_ack(void)
+{
+ struct wpabuf *buf;
+ struct eap_tlv_result_tlv *res;
+ struct eap_tlv_pac_ack_tlv *ack;
+
+ buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
+ if (buf == NULL)
+ return NULL;
+
+ res = wpabuf_put(buf, sizeof(*res));
+ res->tlv_type = host_to_be16(EAP_TLV_RESULT_TLV |
+ EAP_TLV_TYPE_MANDATORY);
+ res->length = host_to_be16(sizeof(*res) - sizeof(struct eap_tlv_hdr));
+ res->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
+
+ ack = wpabuf_put(buf, sizeof(*ack));
+ ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
+ EAP_TLV_TYPE_MANDATORY);
+ ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
+ ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
+ ack->pac_len = host_to_be16(2);
+ ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
+
+ return buf;
+}
+
+
+static struct wpabuf * eap_fast_tlv_eap_payload(struct wpabuf *buf)
+{
+ struct wpabuf *msg;
+ struct eap_tlv_hdr *tlv;
+
+ if (buf == NULL)
+ return NULL;
+
+ /* Encapsulate EAP packet in EAP Payload TLV */
+ msg = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
+ if (msg == NULL) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
+ "for TLV encapsulation");
+ wpabuf_free(buf);
+ return NULL;
+ }
+ tlv = wpabuf_put(msg, sizeof(*tlv));
+ tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
+ EAP_TLV_EAP_PAYLOAD_TLV);
+ tlv->length = host_to_be16(wpabuf_len(buf));
+ wpabuf_put_buf(msg, buf);
+ wpabuf_free(buf);
+ return msg;
+}
+
+
+static struct wpabuf * eap_fast_process_eap_payload_tlv(
+ struct eap_sm *sm, struct eap_fast_data *data,
+ struct eap_method_ret *ret, const struct eap_hdr *req,
+ u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
+{
+ struct eap_hdr *hdr;
+ struct wpabuf *resp = NULL;
+
+ if (eap_payload_tlv_len < sizeof(*hdr)) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
+ "Payload TLV (len=%lu)",
+ (unsigned long) eap_payload_tlv_len);
+ return NULL;
+ }
+
+ hdr = (struct eap_hdr *) eap_payload_tlv;
+ if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
+ "EAP Payload TLV");
+ return NULL;
+ }
+
+ if (hdr->code != EAP_CODE_REQUEST) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
+ "Phase 2 EAP header", hdr->code);
+ return NULL;
+ }
+
+ if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
+ "failed");
+ return NULL;
+ }
+
+ return eap_fast_tlv_eap_payload(resp);
+}
+
+
+static int eap_fast_validate_crypto_binding(
+ struct eap_tlv_crypto_binding__tlv *_bind)
+{
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
+ "Received Version %d SubType %d",
+ _bind->version, _bind->received_version, _bind->subtype);
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
+ _bind->nonce, sizeof(_bind->nonce));
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
+ _bind->compound_mac, sizeof(_bind->compound_mac));
+
+ if (_bind->version != EAP_FAST_VERSION ||
+ _bind->received_version != EAP_FAST_VERSION ||
+ _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
+ "Crypto-Binding TLV: Version %d "
+ "Received Version %d SubType %d",
+ _bind->version, _bind->received_version,
+ _bind->subtype);
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static void eap_fast_write_crypto_binding(
+ struct eap_tlv_crypto_binding__tlv *rbind,
+ struct eap_tlv_crypto_binding__tlv *_bind, const u8 *cmk)
+{
+ rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
+ EAP_TLV_CRYPTO_BINDING_TLV);
+ rbind->length = host_to_be16(sizeof(*rbind) -
+ sizeof(struct eap_tlv_hdr));
+ rbind->version = EAP_FAST_VERSION;
+ rbind->received_version = _bind->version;
+ rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
+ os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
+ inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
+ hmac_sha1(cmk, 20, (u8 *) rbind, sizeof(*rbind), rbind->compound_mac);
+
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
+ "Received Version %d SubType %d",
+ rbind->version, rbind->received_version, rbind->subtype);
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
+ rbind->nonce, sizeof(rbind->nonce));
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
+ rbind->compound_mac, sizeof(rbind->compound_mac));
+}
+
+
+static int eap_fast_get_phase2_key(struct eap_sm *sm,
+ struct eap_fast_data *data,
+ u8 *isk, size_t isk_len)
+{
+ u8 *key;
+ size_t key_len;
+
+ os_memset(isk, 0, isk_len);
+
+ if (data->phase2_method == NULL || data->phase2_priv == NULL) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
+ "available");
+ return -1;
+ }
+
+ if (data->phase2_method->isKeyAvailable == NULL ||
+ data->phase2_method->getKey == NULL)
+ return 0;
+
+ if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
+ (key = data->phase2_method->getKey(sm, data->phase2_priv,
+ &key_len)) == NULL) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
+ "from Phase 2");
+ return -1;
+ }
+
+ if (key_len > isk_len)
+ key_len = isk_len;
+ os_memcpy(isk, key, key_len);
+ os_free(key);
+
+ return 0;
+}
+
+
+static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
+ u8 *cmk)
+{
+ u8 isk[32], imck[60];
+
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
+ "calculation", data->simck_idx + 1);
+
+ /*
+ * RFC 4851, Section 5.2:
+ * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
+ * MSK[j], 60)
+ * S-IMCK[j] = first 40 octets of IMCK[j]
+ * CMK[j] = last 20 octets of IMCK[j]
+ */
+
+ if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
+ return -1;
+ wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
+ sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
+ "Inner Methods Compound Keys",
+ isk, sizeof(isk), imck, sizeof(imck));
+ data->simck_idx++;
+ os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
+ wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
+ data->simck, EAP_FAST_SIMCK_LEN);
+ os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, 20);
+ wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", cmk, 20);
+
+ return 0;
+}
+
+
+static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
+{
+ struct eap_tlv_hdr *pac;
+ struct eap_tlv_request_action_tlv *act;
+ struct eap_tlv_pac_type_tlv *type;
+
+ act = (struct eap_tlv_request_action_tlv *) pos;
+ act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
+ act->length = host_to_be16(2);
+ act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
+
+ pac = (struct eap_tlv_hdr *) (act + 1);
+ pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
+ pac->length = host_to_be16(sizeof(*type));
+
+ type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
+ type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
+ type->length = host_to_be16(2);
+ type->pac_type = host_to_be16(pac_type);
+
+ return (u8 *) (type + 1);
+}
+
+
+static struct wpabuf * eap_fast_process_crypto_binding(
+ struct eap_sm *sm, struct eap_fast_data *data,
+ struct eap_method_ret *ret,
+ struct eap_tlv_crypto_binding__tlv *_bind, size_t bind_len, int final)
+{
+ struct wpabuf *resp;
+ u8 *pos;
+ struct eap_tlv_intermediate_result_tlv *rresult;
+ u8 cmk[20], cmac[20];
+ int res, req_tunnel_pac = 0;
+ size_t len;
+
+ if (eap_fast_validate_crypto_binding(_bind) < 0)
+ return eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
+
+ if (eap_fast_get_cmk(sm, data, cmk) < 0)
+ return NULL;
+
+ /* Validate received Compound MAC */
+ os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
+ os_memset(_bind->compound_mac, 0, sizeof(cmac));
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
+ "MAC calculation", (u8 *) _bind, bind_len);
+ hmac_sha1(cmk, 20, (u8 *) _bind, bind_len, _bind->compound_mac);
+ res = os_memcmp(cmac, _bind->compound_mac, sizeof(cmac));
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
+ cmac, sizeof(cmac));
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
+ _bind->compound_mac, sizeof(cmac));
+ if (res != 0) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
+ resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
+ os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
+ return resp;
+ }
+
+ /*
+ * Compound MAC was valid, so authentication succeeded. Reply with
+ * crypto binding to allow server to complete authentication.
+ */
+
+ if (data->current_pac == NULL && data->provisioning &&
+ !data->anon_provisioning) {
+ /*
+ * Need to request Tunnel PAC when using authenticated
+ * provisioning.
+ */
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
+ req_tunnel_pac = 1;
+ }
+
+ len = sizeof(*rresult) + sizeof(struct eap_tlv_crypto_binding__tlv);
+ if (req_tunnel_pac)
+ len += sizeof(struct eap_tlv_hdr) +
+ sizeof(struct eap_tlv_request_action_tlv) +
+ sizeof(struct eap_tlv_pac_type_tlv);
+ resp = wpabuf_alloc(len);
+ if (resp == NULL)
+ return NULL;
+
+ /*
+ * Both intermediate and final Result TLVs are identical, so ok to use
+ * the same structure definition for them.
+ */
+ rresult = wpabuf_put(resp, sizeof(*rresult));
+ rresult->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
+ (final ? EAP_TLV_RESULT_TLV :
+ EAP_TLV_INTERMEDIATE_RESULT_TLV));
+ rresult->length = host_to_be16(2);
+ rresult->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
+
+ if (!data->anon_provisioning && data->phase2_success &&
+ eap_fast_derive_msk(data) < 0) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
+ ret->methodState = METHOD_DONE;
+ ret->decision = DECISION_FAIL;
+ rresult->status = host_to_be16(EAP_TLV_RESULT_FAILURE);
+ data->phase2_success = 0;
+ }
+
+ pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding__tlv));
+ eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding__tlv *)
+ pos, _bind, cmk);
+
+ if (req_tunnel_pac) {
+ u8 *pos2;
+ pos = wpabuf_put(resp, 0);
+ pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
+ wpabuf_put(resp, pos2 - pos);
+ }
+
+ if (final && data->phase2_success) {
+ if (data->anon_provisioning) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
+ "provisioning completed successfully.");
+ ret->methodState = METHOD_DONE;
+ ret->decision = DECISION_FAIL;
+ } else {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
+ "completed successfully.");
+ if (data->provisioning)
+ ret->methodState = METHOD_MAY_CONT;
+ else
+ ret->methodState = METHOD_DONE;
+ ret->decision = DECISION_UNCOND_SUCC;
+ }
+ }
+
+ return resp;
+}
+
+
+static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
+ u8 *pos, size_t len, int *pac_key_found)
+{
+ switch (type & 0x7fff) {
+ case PAC_TYPE_PAC_KEY:
+ wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
+ if (len != EAP_FAST_PAC_KEY_LEN) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
+ "length %lu", (unsigned long) len);
+ break;
+ }
+ *pac_key_found = 1;
+ os_memcpy(entry->pac_key, pos, len);
+ break;
+ case PAC_TYPE_PAC_OPAQUE:
+ wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
+ entry->pac_opaque = pos;
+ entry->pac_opaque_len = len;
+ break;
+ case PAC_TYPE_PAC_INFO:
+ wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
+ entry->pac_info = pos;
+ entry->pac_info_len = len;
+ break;
+ default:
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
+ type);
+ break;
+ }
+}
+
+
+static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
+ u8 *pac, size_t pac_len)
+{
+ struct pac_tlv_hdr *hdr;
+ u8 *pos;
+ size_t left, len;
+ int type, pac_key_found = 0;
+
+ pos = pac;
+ left = pac_len;
+
+ while (left > sizeof(*hdr)) {
+ hdr = (struct pac_tlv_hdr *) pos;
+ type = be_to_host16(hdr->type);
+ len = be_to_host16(hdr->len);
+ pos += sizeof(*hdr);
+ left -= sizeof(*hdr);
+ if (len > left) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
+ "(type=%d len=%lu left=%lu)",
+ type, (unsigned long) len,
+ (unsigned long) left);
+ return -1;
+ }
+
+ eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
+
+ pos += len;
+ left -= len;
+ }
+
+ if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
+ "all the required fields");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
+ u8 *pos, size_t len)
+{
+ u16 pac_type;
+ u32 lifetime;
+ struct os_time now;
+
+ switch (type & 0x7fff) {
+ case PAC_TYPE_CRED_LIFETIME:
+ if (len != 4) {
+ wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
+ "Invalid CRED_LIFETIME length - ignored",
+ pos, len);
+ return 0;
+ }
+
+ /*
+ * This is not currently saved separately in PAC files since
+ * the server can automatically initiate PAC update when
+ * needed. Anyway, the information is available from PAC-Info
+ * dump if it is needed for something in the future.
+ */
+ lifetime = WPA_GET_BE32(pos);
+ os_get_time(&now);
+ wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
+ "(%d days)",
+ lifetime, (lifetime - (u32) now.sec) / 86400);
+ break;
+ case PAC_TYPE_A_ID:
+ wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
+ pos, len);
+ entry->a_id = pos;
+ entry->a_id_len = len;
+ break;
+ case PAC_TYPE_I_ID:
+ wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
+ pos, len);
+ entry->i_id = pos;
+ entry->i_id_len = len;
+ break;
+ case PAC_TYPE_A_ID_INFO:
+ wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
+ pos, len);
+ entry->a_id_info = pos;
+ entry->a_id_info_len = len;
+ break;
+ case PAC_TYPE_PAC_TYPE:
+ /*
+ * draft-cam-winget-eap-fast-provisioning-04.txt,
+ * Section 4.2.6 - PAC-Type TLV
+ */
+ if (len != 2) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
+ "length %lu (expected 2)",
+ (unsigned long) len);
+ wpa_hexdump_ascii(MSG_DEBUG,
+ "EAP-FAST: PAC-Info - PAC-Type",
+ pos, len);
+ return -1;
+ }
+ pac_type = WPA_GET_BE16(pos);
+ if (pac_type != PAC_TYPE_TUNNEL_PAC &&
+ pac_type != PAC_TYPE_USER_AUTHORIZATION &&
+ pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
+ "%d", pac_type);
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
+ pac_type);
+ entry->pac_type = pac_type;
+ break;
+ default:
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
+ "type %d", type);
+ break;
+ }
+
+ return 0;
+}
+
+
+static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
+{
+ struct pac_tlv_hdr *hdr;
+ u8 *pos;
+ size_t left, len;
+ int type;
+
+ /* draft-cam-winget-eap-fast-provisioning-04.txt, Section 4.2.4 */
+
+ /* PAC-Type defaults to Tunnel PAC (Type 1) */
+ entry->pac_type = PAC_TYPE_TUNNEL_PAC;
+
+ pos = entry->pac_info;
+ left = entry->pac_info_len;
+ while (left > sizeof(*hdr)) {
+ hdr = (struct pac_tlv_hdr *) pos;
+ type = be_to_host16(hdr->type);
+ len = be_to_host16(hdr->len);
+ pos += sizeof(*hdr);
+ left -= sizeof(*hdr);
+ if (len > left) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
+ "(type=%d len=%lu left=%lu)",
+ type, (unsigned long) len,
+ (unsigned long) left);
+ return -1;
+ }
+
+ if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
+ return -1;
+
+ pos += len;
+ left -= len;
+ }
+
+ if (entry->a_id == NULL || entry->a_id_info == NULL) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
+ "all the required fields");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
+ struct eap_fast_data *data,
+ struct eap_method_ret *ret,
+ u8 *pac, size_t pac_len)
+{
+ struct eap_peer_config *config = eap_get_config(sm);
+ struct eap_fast_pac entry;
+
+ os_memset(&entry, 0, sizeof(entry));
+ if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
+ eap_fast_process_pac_info(&entry))
+ return eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
+
+ eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
+ eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
+ if (data->use_pac_binary_format)
+ eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
+ else
+ eap_fast_save_pac(sm, data->pac, config->pac_file);
+
+ if (data->provisioning) {
+ if (data->anon_provisioning) {
+ /*
+ * Unauthenticated provisioning does not provide keying
+ * material and must end with an EAP-Failure.
+ * Authentication will be done separately after this.
+ */
+ data->success = 0;
+ ret->decision = DECISION_FAIL;
+ } else {
+ /*
+ * Server may or may not allow authenticated
+ * provisioning also for key generation.
+ */
+ ret->decision = DECISION_COND_SUCC;
+ }
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
+ "- Provisioning completed successfully");
+ } else {
+ /*
+ * This is PAC refreshing, i.e., normal authentication that is
+ * expected to be completed with an EAP-Success.
+ */
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
+ "- PAC refreshing completed successfully");
+ ret->decision = DECISION_UNCOND_SUCC;
+ }
+ ret->methodState = METHOD_DONE;
+ return eap_fast_tlv_pac_ack();
+}
+
+
+struct eap_fast_tlv_parse {
+ u8 *eap_payload_tlv;
+ size_t eap_payload_tlv_len;
+ u8 *pac;
+ size_t pac_len;
+ struct eap_tlv_crypto_binding__tlv *crypto_binding;
+ size_t crypto_binding_len;
+ int iresult;
+ int result;
+};
+
+
+static int eap_fast_parse_tlv(struct eap_fast_tlv_parse *tlv,
+ int tlv_type, u8 *pos, int len)
+{
+ switch (tlv_type) {
+ case EAP_TLV_EAP_PAYLOAD_TLV:
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: EAP Payload TLV",
+ pos, len);
+ tlv->eap_payload_tlv = pos;
+ tlv->eap_payload_tlv_len = len;
+ break;
+ case EAP_TLV_RESULT_TLV:
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Result TLV", pos, len);
+ if (len < 2) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
+ "Result TLV");
+ tlv->result = EAP_TLV_RESULT_FAILURE;
+ break;
+ }
+ tlv->result = WPA_GET_BE16(pos);
+ if (tlv->result != EAP_TLV_RESULT_SUCCESS &&
+ tlv->result != EAP_TLV_RESULT_FAILURE) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Unknown Result %d",
+ tlv->result);
+ tlv->result = EAP_TLV_RESULT_FAILURE;
+ }
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Result: %s",
+ tlv->result == EAP_TLV_RESULT_SUCCESS ?
+ "Success" : "Failure");
+ break;
+ case EAP_TLV_INTERMEDIATE_RESULT_TLV:
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Intermediate Result TLV",
+ pos, len);
+ if (len < 2) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
+ "Intermediate Result TLV");
+ tlv->iresult = EAP_TLV_RESULT_FAILURE;
+ break;
+ }
+ tlv->iresult = WPA_GET_BE16(pos);
+ if (tlv->iresult != EAP_TLV_RESULT_SUCCESS &&
+ tlv->iresult != EAP_TLV_RESULT_FAILURE) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Unknown Intermediate "
+ "Result %d", tlv->iresult);
+ tlv->iresult = EAP_TLV_RESULT_FAILURE;
+ }
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Intermediate Result: %s",
+ tlv->iresult == EAP_TLV_RESULT_SUCCESS ?
+ "Success" : "Failure");
+ break;
+ case EAP_TLV_CRYPTO_BINDING_TLV:
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV",
+ pos, len);
+ tlv->crypto_binding_len = sizeof(struct eap_tlv_hdr) + len;
+ if (tlv->crypto_binding_len < sizeof(*tlv->crypto_binding)) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
+ "Crypto-Binding TLV");
+ tlv->iresult = EAP_TLV_RESULT_FAILURE;
+ return -2;
+ }
+ tlv->crypto_binding = (struct eap_tlv_crypto_binding__tlv *)
+ (pos - sizeof(struct eap_tlv_hdr));
+ break;
+ case EAP_TLV_PAC_TLV:
+ wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: PAC TLV", pos, len);
+ tlv->pac = pos;
+ tlv->pac_len = len;
+ break;
+ default:
+ /* Unknown TLV */
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
+ struct eap_fast_tlv_parse *tlv,
+ struct wpabuf **resp)
+{
+ int mandatory, tlv_type, len, res;
+ u8 *pos, *end;
+
+ os_memset(tlv, 0, sizeof(*tlv));
+
+ /* Parse TLVs from the decrypted Phase 2 data */
+ pos = wpabuf_mhead(decrypted);
+ end = pos + wpabuf_len(decrypted);
+ while (pos + 4 < end) {
+ mandatory = pos[0] & 0x80;
+ tlv_type = WPA_GET_BE16(pos) & 0x3fff;
+ pos += 2;
+ len = WPA_GET_BE16(pos);
+ pos += 2;
+ if (pos + len > end) {
+ wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
+ return -1;
+ }
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
+ "TLV type %d length %d%s",
+ tlv_type, len, mandatory ? " (mandatory)" : "");
+
+ res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
+ if (res == -2)
+ break;
+ if (res < 0) {
+ if (mandatory) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
+ "mandatory TLV type %d", tlv_type);
+ *resp = eap_fast_tlv_nak(0, tlv_type);
+ break;
+ } else {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
+ "unknown optional TLV type %d",
+ tlv_type);
+ }
+ }
+
+ pos += len;
+ }
+
+ return 0;
+}
+
+
+static int eap_fast_encrypt_response(struct eap_sm *sm,
+ struct eap_fast_data *data,
+ struct wpabuf *resp,
+ u8 identifier, struct wpabuf **out_data)
+{
+ if (resp == NULL)
+ return 0;
+
+ wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
+ resp);
+ if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
+ data->fast_version, identifier,
+ resp, out_data)) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
+ "frame");
+ }
+ wpabuf_free(resp);
+
+ return 0;
+}
+
+
+static int eap_fast_process_decrypted(struct eap_sm *sm,
+ struct eap_fast_data *data,
+ struct eap_method_ret *ret,
+ const struct eap_hdr *req,
+ struct wpabuf *decrypted,
+ struct wpabuf **out_data)
+{
+ struct wpabuf *resp = NULL;
+ struct eap_fast_tlv_parse tlv;
+
+ if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
+ return 0;
+ if (resp)
+ return eap_fast_encrypt_response(sm, data, resp,
+ req->identifier, out_data);
+
+ if (tlv.result == EAP_TLV_RESULT_FAILURE) {
+ resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
+ return eap_fast_encrypt_response(sm, data, resp,
+ req->identifier, out_data);
+ }
+
+ if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
+ resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
+ return eap_fast_encrypt_response(sm, data, resp,
+ req->identifier, out_data);
+ }
+
+ if (tlv.eap_payload_tlv) {
+ resp = eap_fast_process_eap_payload_tlv(
+ sm, data, ret, req, tlv.eap_payload_tlv,
+ tlv.eap_payload_tlv_len);
+ return eap_fast_encrypt_response(sm, data, resp,
+ req->identifier, out_data);
+ }
+
+ if (tlv.crypto_binding) {
+ int final = tlv.result == EAP_TLV_RESULT_SUCCESS;
+ resp = eap_fast_process_crypto_binding(sm, data, ret,
+ tlv.crypto_binding,
+ tlv.crypto_binding_len,
+ final);
+ return eap_fast_encrypt_response(sm, data, resp,
+ req->identifier, out_data);
+ }
+
+ if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
+ "acknowledging success");
+ resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
+ return eap_fast_encrypt_response(sm, data, resp,
+ req->identifier, out_data);
+ }
+
+ if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
+ resp = eap_fast_process_pac(sm, data, ret, tlv.pac,
+ tlv.pac_len);
+ return eap_fast_encrypt_response(sm, data, resp,
+ req->identifier, out_data);
+ }
+
+ wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
+ "empty response packet");
+ return eap_fast_encrypt_response(sm, data, wpabuf_alloc(1),
+ req->identifier, out_data);
+}
+
+
+static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
+ struct eap_method_ret *ret,
+ const struct eap_hdr *req,
+ const struct wpabuf *in_data,
+ struct wpabuf **out_data)
+{
+ struct wpabuf *in_decrypted;
+ int res;
+
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
+ " Phase 2", (unsigned long) wpabuf_len(in_data));
+
+ if (data->pending_phase2_req) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
+ "skip decryption and use old data");
+ /* Clear TLS reassembly state. */
+ eap_peer_tls_reset_input(&data->ssl);
+
+ in_decrypted = data->pending_phase2_req;
+ data->pending_phase2_req = NULL;
+ goto continue_req;
+ }
+
+ if (wpabuf_len(in_data) == 0) {
+ /* Received TLS ACK - requesting more fragments */
+ return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
+ data->fast_version,
+ req->identifier, NULL, out_data);
+ }
+
+ res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
+ if (res)
+ return res;
+
+continue_req:
+ wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
+ in_decrypted);
+
+ if (wpabuf_len(in_decrypted) < 4) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
+ "TLV frame (len=%lu)",
+ (unsigned long) wpabuf_len(in_decrypted));
+ wpabuf_free(in_decrypted);
+ return -1;
+ }
+
+ res = eap_fast_process_decrypted(sm, data, ret, req,
+ in_decrypted, out_data);
+
+ wpabuf_free(in_decrypted);
+
+ return res;
+}
+
+
+static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
+{
+ const u8 *a_id;
+ struct pac_tlv_hdr *hdr;
+
+ /*
+ * Parse authority identity (A-ID) from the EAP-FAST/Start. This
+ * supports both raw A-ID and one inside an A-ID TLV.
+ */
+ a_id = buf;
+ *id_len = len;
+ if (len > sizeof(*hdr)) {
+ int tlen;
+ hdr = (struct pac_tlv_hdr *) buf;
+ tlen = be_to_host16(hdr->len);
+ if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
+ sizeof(*hdr) + tlen <= len) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
+ "(Start)");
+ a_id = (u8 *) (hdr + 1);
+ *id_len = tlen;
+ }
+ }
+ wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
+
+ return a_id;
+}
+
+
+static void eap_fast_select_pac(struct eap_fast_data *data,
+ const u8 *a_id, size_t a_id_len)
+{
+ data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
+ PAC_TYPE_TUNNEL_PAC);
+ if (data->current_pac == NULL) {
+ /*
+ * Tunnel PAC was not available for this A-ID. Try to use
+ * Machine Authentication PAC, if one is available.
+ */
+ data->current_pac = eap_fast_get_pac(
+ data->pac, a_id, a_id_len,
+ PAC_TYPE_MACHINE_AUTHENTICATION);
+ }
+
+ if (data->current_pac) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
+ "(PAC-Type %d)", data->current_pac->pac_type);
+ wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
+ data->current_pac->a_id_info,
+ data->current_pac->a_id_info_len);
+ }
+}
+
+
+static int eap_fast_use_pac_opaque(struct eap_sm *sm,
+ struct eap_fast_data *data,
+ struct eap_fast_pac *pac)
+{
+ u8 *tlv;
+ size_t tlv_len, olen;
+ struct eap_tlv_hdr *ehdr;
+
+ olen = pac->pac_opaque_len;
+ tlv_len = sizeof(*ehdr) + olen;
+ tlv = os_malloc(tlv_len);
+ if (tlv) {
+ ehdr = (struct eap_tlv_hdr *) tlv;
+ ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
+ ehdr->length = host_to_be16(olen);
+ os_memcpy(ehdr + 1, pac->pac_opaque, olen);
+ }
+ if (tlv == NULL ||
+ tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
+ TLS_EXT_PAC_OPAQUE,
+ tlv, tlv_len) < 0) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
+ "extension");
+ os_free(tlv);
+ return -1;
+ }
+ os_free(tlv);
+
+ return 0;
+}
+
+
+static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
+ struct eap_fast_data *data)
+{
+ if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
+ TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
+ "TLS extension");
+ return -1;
+ }
+ return 0;
+}
+
+
+static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
+ struct eap_fast_data *data)
+{
+ u8 ciphers[5];
+ int count = 0;
+
+ if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
+ "provisioning TLS cipher suites");
+ ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
+ }
+
+ if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
+ "provisioning TLS cipher suites");
+ ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
+ ciphers[count++] = TLS_CIPHER_AES128_SHA;
+ ciphers[count++] = TLS_CIPHER_RC4_SHA;
+ }
+
+ ciphers[count++] = TLS_CIPHER_NONE;
+
+ if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
+ ciphers)) {
+ wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
+ "cipher suites for provisioning");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int eap_fast_process_start(struct eap_sm *sm,
+ struct eap_fast_data *data, u8 flags,
+ const u8 *pos, size_t left)
+{
+ const u8 *a_id;
+ size_t a_id_len;
+
+ /* EAP-FAST Version negotiation (section 3.1) */
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
+ flags & EAP_PEAP_VERSION_MASK, data->fast_version);
+ if ((flags & EAP_PEAP_VERSION_MASK) < data->fast_version)
+ data->fast_version = flags & EAP_PEAP_VERSION_MASK;
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
+ data->fast_version);
+
+ a_id = eap_fast_get_a_id(pos, left, &a_id_len);
+ eap_fast_select_pac(data, a_id, a_id_len);
+
+ if (data->resuming && data->current_pac) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
+ "do not add PAC-Opaque to TLS ClientHello");
+ if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
+ return -1;
+ } else if (data->current_pac) {
+ /*
+ * PAC found for the A-ID and we are not resuming an old
+ * session, so add PAC-Opaque extension to ClientHello.
+ */
+ if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
+ return -1;
+ } else {
+ /* No PAC found, so we must provision one. */
+ if (!data->provisioning_allowed) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
+ "provisioning disabled");
+ return -1;
+ }
+ wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
+ "starting provisioning");
+ if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
+ eap_fast_clear_pac_opaque_ext(sm, data) < 0)
+ return -1;
+ data->provisioning = 1;
+ }
+
+ return 0;
+}
+
+
+static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
+ struct eap_method_ret *ret,
+ const struct wpabuf *reqData)
+{
+ const struct eap_hdr *req;
+ size_t left;
+ int res;
+ u8 flags, id;
+ struct wpabuf *resp;
+ const u8 *pos;
+ struct eap_fast_data *data = priv;
+
+ pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
+ reqData, &left, &flags);
+ if (pos == NULL)
+ return NULL;
+
+ req = wpabuf_head(reqData);
+ id = req->identifier;
+
+ if (flags & EAP_TLS_FLAGS_START) {
+ if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
+ return NULL;
+
+ left = 0; /* A-ID is not used in further packet processing */
+ }
+
+ resp = NULL;
+ if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
+ !data->resuming) {
+ /* Process tunneled (encrypted) phase 2 data. */
+ struct wpabuf msg;
+ wpabuf_set(&msg, pos, left);
+ res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
+ if (res < 0) {
+ ret->methodState = METHOD_DONE;
+ ret->decision = DECISION_FAIL;
+ /*
+ * Ack possible Alert that may have caused failure in
+ * decryption.
+ */
+ res = 1;
+ }
+ } else {
+ /* Continue processing TLS handshake (phase 1). */
+ res = eap_peer_tls_process_helper(sm, &data->ssl,
+ EAP_TYPE_FAST,
+ data->fast_version, id, pos,
+ left, &resp);
+
+ if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
+ char cipher[80];
+ wpa_printf(MSG_DEBUG,
+ "EAP-FAST: TLS done, proceed to Phase 2");
+ if (data->provisioning &&
+ (!(data->provisioning_allowed &
+ EAP_FAST_PROV_AUTH) ||
+ tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
+ cipher, sizeof(cipher)) < 0 ||
+ os_strstr(cipher, "ADH-") ||
+ os_strstr(cipher, "anon"))) {
+ wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
+ "anonymous (unauthenticated) "
+ "provisioning");
+ data->anon_provisioning = 1;
+ } else
+ data->anon_provisioning = 0;
+ data->resuming = 0;
+ eap_fast_derive_keys(sm, data);
+ }
+
+ if (res == 2) {
+ struct wpabuf msg;
+ /*
+ * Application data included in the handshake message.
+ */
+ wpabuf_free(data->pending_phase2_req);
+ data->pending_phase2_req = resp;
+ resp = NULL;
+ wpabuf_set(&msg, pos, left);
+ res = eap_fast_decrypt(sm, data, ret, req, &msg,
+ &resp);
+ }
+ }
+
+ if (res == 1) {
+ wpabuf_free(resp);
+ return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
+ data->fast_version);
+ }
+
+ return resp;
+}
+
+
+#if 0 /* FIX */
+static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
+{
+ struct eap_fast_data *data = priv;
+ return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
+}
+
+
+static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
+{
+ struct eap_fast_data *data = priv;
+ os_free(data->key_block_p);
+ data->key_block_p = NULL;
+ wpabuf_free(data->pending_phase2_req);
+ data->pending_phase2_req = NULL;
+}
+
+
+static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
+{
+ struct eap_fast_data *data = priv;
+ if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
+ os_free(data);
+ return NULL;
+ }
+ if (data->phase2_priv && data->phase2_method &&
+ data->phase2_method->init_for_reauth)
+ data->phase2_method->init_for_reauth(sm, data->phase2_priv);
+ data->phase2_success = 0;
+ data->resuming = 1;
+ data->provisioning = 0;
+ data->anon_provisioning = 0;
+ data->simck_idx = 0;
+ return priv;
+}
+#endif
+
+
+static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
+ size_t buflen, int verbose)
+{
+ struct eap_fast_data *data = priv;
+ int len, ret;
+
+ len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
+ if (data->phase2_method) {
+ ret = os_snprintf(buf + len, buflen - len,
+ "EAP-FAST Phase2 method=%s\n",
+ data->phase2_method->name);
+ if (ret < 0 || (size_t) ret >= buflen - len)
+ return len;
+ len += ret;
+ }
+ return len;
+}
+
+
+static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
+{
+ struct eap_fast_data *data = priv;
+ return data->success;
+}
+
+
+static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
+{
+ struct eap_fast_data *data = priv;
+ u8 *key;
+
+ if (!data->success)
+ return NULL;
+
+ key = os_malloc(EAP_FAST_KEY_LEN);
+ if (key == NULL)
+ return NULL;
+
+ *len = EAP_FAST_KEY_LEN;
+ os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
+
+ return key;
+}
+
+
+static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
+{
+ struct eap_fast_data *data = priv;
+ u8 *key;
+
+ if (!data->success)
+ return NULL;
+
+ key = os_malloc(EAP_EMSK_LEN);
+ if (key == NULL)
+ return NULL;
+
+ *len = EAP_EMSK_LEN;
+ os_memcpy(key, data->emsk, EAP_EMSK_LEN);
+
+ return key;
+}
+
+
+int eap_peer_fast_register(void)
+{
+ struct eap_method *eap;
+ int ret;
+
+ eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
+ EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
+ if (eap == NULL)
+ return -1;
+
+ eap->init = eap_fast_init;
+ eap->deinit = eap_fast_deinit;
+ eap->process = eap_fast_process;
+ eap->isKeyAvailable = eap_fast_isKeyAvailable;
+ eap->getKey = eap_fast_getKey;
+ eap->get_status = eap_fast_get_status;
+#if 0
+ eap->has_reauth_data = eap_fast_has_reauth_data;
+ eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
+ eap->init_for_reauth = eap_fast_init_for_reauth;
+#endif
+ eap->get_emsk = eap_fast_get_emsk;
+
+ ret = eap_peer_method_register(eap);
+ if (ret)
+ eap_peer_method_free(eap);
+ return ret;
+}