contrib/wpa/src/crypto/tls_gnutls.c

   1 /*
   2  * SSL/TLS interface functions for GnuTLS
   3  * Copyright (c) 2004-2017, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10 #include <gnutls/gnutls.h>
  11 #include <gnutls/x509.h>
  12 #ifdef PKCS12_FUNCS
  13 #include <gnutls/pkcs12.h>
  14 #endif /* PKCS12_FUNCS */
  15 #if GNUTLS_VERSION_NUMBER >= 0x030103
  16 #include <gnutls/ocsp.h>
  17 #endif /* 3.1.3 */
  18
  19 #include "common.h"
  20 #include "crypto/crypto.h"
  21 #include "tls.h"
  22
  23
  24 static int tls_gnutls_ref_count = 0;
  25
  26 struct tls_global {
  27         /* Data for session resumption */
  28         void *session_data;
  29         size_t session_data_size;
  30
  31         int server;
  32
  33         int params_set;
  34         gnutls_certificate_credentials_t xcred;
  35
  36         void (*event_cb)(void *ctx, enum tls_event ev,
  37                          union tls_event_data *data);
  38         void *cb_ctx;
  39         int cert_in_cb;
  40
  41         char *ocsp_stapling_response;
  42 };
  43
  44 struct tls_connection {
  45         struct tls_global *global;
  46         gnutls_session_t session;
  47         int read_alerts, write_alerts, failed;
  48
  49         u8 *pre_shared_secret;
  50         size_t pre_shared_secret_len;
  51         int established;
  52         int verify_peer;
  53         unsigned int disable_time_checks:1;
  54
  55         struct wpabuf *push_buf;
  56         struct wpabuf *pull_buf;
  57         const u8 *pull_buf_offset;
  58
  59         int params_set;
  60         gnutls_certificate_credentials_t xcred;
  61
  62         char *suffix_match;
  63         char *domain_match;
  64         unsigned int flags;
  65 };
  66
  67
  68 static int tls_connection_verify_peer(gnutls_session_t session);
  69
  70
  71 static void tls_log_func(int level, const char *msg)
  72 {
  73         char *s, *pos;
  74         if (level == 6 || level == 7) {
  75                 /* These levels seem to be mostly I/O debug and msg dumps */
  76                 return;
  77         }
  78
  79         s = os_strdup(msg);
  80         if (s == NULL)
  81                 return;
  82
  83         pos = s;
  84         while (*pos != '\0') {
  85                 if (*pos == '\n') {
  86                         *pos = '\0';
  87                         break;
  88                 }
  89                 pos++;
  90         }
  91         wpa_printf(level > 3 ? MSG_MSGDUMP : MSG_DEBUG,
  92                    "gnutls<%d> %s", level, s);
  93         os_free(s);
  94 }
  95
  96
  97 void * tls_init(const struct tls_config *conf)
  98 {
  99         struct tls_global *global;
 100
 101         if (tls_gnutls_ref_count == 0) {
 102                 wpa_printf(MSG_DEBUG,
 103                            "GnuTLS: Library version %s (runtime) - %s (build)",
 104                            gnutls_check_version(NULL), GNUTLS_VERSION);
 105         }
 106
 107         global = os_zalloc(sizeof(*global));
 108         if (global == NULL)
 109                 return NULL;
 110
 111         if (tls_gnutls_ref_count == 0 && gnutls_global_init() < 0) {
 112                 os_free(global);
 113                 return NULL;
 114         }
 115         tls_gnutls_ref_count++;
 116
 117         gnutls_global_set_log_function(tls_log_func);
 118         if (wpa_debug_show_keys)
 119                 gnutls_global_set_log_level(11);
 120
 121         if (conf) {
 122                 global->event_cb = conf->event_cb;
 123                 global->cb_ctx = conf->cb_ctx;
 124                 global->cert_in_cb = conf->cert_in_cb;
 125         }
 126
 127         return global;
 128 }
 129
 130
 131 void tls_deinit(void *ssl_ctx)
 132 {
 133         struct tls_global *global = ssl_ctx;
 134         if (global) {
 135                 if (global->params_set)
 136                         gnutls_certificate_free_credentials(global->xcred);
 137                 os_free(global->session_data);
 138                 os_free(global->ocsp_stapling_response);
 139                 os_free(global);
 140         }
 141
 142         tls_gnutls_ref_count--;
 143         if (tls_gnutls_ref_count == 0)
 144                 gnutls_global_deinit();
 145 }
 146
 147
 148 int tls_get_errors(void *ssl_ctx)
 149 {
 150         return 0;
 151 }
 152
 153
 154 static ssize_t tls_pull_func(gnutls_transport_ptr_t ptr, void *buf,
 155                              size_t len)
 156 {
 157         struct tls_connection *conn = (struct tls_connection *) ptr;
 158         const u8 *end;
 159         if (conn->pull_buf == NULL) {
 160                 errno = EWOULDBLOCK;
 161                 return -1;
 162         }
 163
 164         end = wpabuf_head_u8(conn->pull_buf) + wpabuf_len(conn->pull_buf);
 165         if ((size_t) (end - conn->pull_buf_offset) < len)
 166                 len = end - conn->pull_buf_offset;
 167         os_memcpy(buf, conn->pull_buf_offset, len);
 168         conn->pull_buf_offset += len;
 169         if (conn->pull_buf_offset == end) {
 170                 wpa_printf(MSG_DEBUG, "%s - pull_buf consumed", __func__);
 171                 wpabuf_free(conn->pull_buf);
 172                 conn->pull_buf = NULL;
 173                 conn->pull_buf_offset = NULL;
 174         } else {
 175                 wpa_printf(MSG_DEBUG, "%s - %lu bytes remaining in pull_buf",
 176                            __func__,
 177                            (unsigned long) (end - conn->pull_buf_offset));
 178         }
 179         return len;
 180 }
 181
 182
 183 static ssize_t tls_push_func(gnutls_transport_ptr_t ptr, const void *buf,
 184                              size_t len)
 185 {
 186         struct tls_connection *conn = (struct tls_connection *) ptr;
 187
 188         if (wpabuf_resize(&conn->push_buf, len) < 0) {
 189                 errno = ENOMEM;
 190                 return -1;
 191         }
 192         wpabuf_put_data(conn->push_buf, buf, len);
 193
 194         return len;
 195 }
 196
 197
 198 static int tls_gnutls_init_session(struct tls_global *global,
 199                                    struct tls_connection *conn)
 200 {
 201         const char *err;
 202         int ret;
 203
 204         ret = gnutls_init(&conn->session,
 205                           global->server ? GNUTLS_SERVER : GNUTLS_CLIENT);
 206         if (ret < 0) {
 207                 wpa_printf(MSG_INFO, "TLS: Failed to initialize new TLS "
 208                            "connection: %s", gnutls_strerror(ret));
 209                 return -1;
 210         }
 211
 212         ret = gnutls_set_default_priority(conn->session);
 213         if (ret < 0)
 214                 goto fail;
 215
 216         ret = gnutls_priority_set_direct(conn->session, "NORMAL:-VERS-SSL3.0",
 217                                          &err);
 218         if (ret < 0) {
 219                 wpa_printf(MSG_ERROR, "GnuTLS: Priority string failure at "
 220                            "'%s'", err);
 221                 goto fail;
 222         }
 223
 224         gnutls_transport_set_pull_function(conn->session, tls_pull_func);
 225         gnutls_transport_set_push_function(conn->session, tls_push_func);
 226         gnutls_transport_set_ptr(conn->session, (gnutls_transport_ptr_t) conn);
 227         gnutls_session_set_ptr(conn->session, conn);
 228
 229         return 0;
 230
 231 fail:
 232         wpa_printf(MSG_INFO, "TLS: Failed to setup new TLS connection: %s",
 233                    gnutls_strerror(ret));
 234         gnutls_deinit(conn->session);
 235         return -1;
 236 }
 237
 238
 239 struct tls_connection * tls_connection_init(void *ssl_ctx)
 240 {
 241         struct tls_global *global = ssl_ctx;
 242         struct tls_connection *conn;
 243         int ret;
 244
 245         conn = os_zalloc(sizeof(*conn));
 246         if (conn == NULL)
 247                 return NULL;
 248         conn->global = global;
 249
 250         if (tls_gnutls_init_session(global, conn)) {
 251                 os_free(conn);
 252                 return NULL;
 253         }
 254
 255         if (global->params_set) {
 256                 ret = gnutls_credentials_set(conn->session,
 257                                              GNUTLS_CRD_CERTIFICATE,
 258                                              global->xcred);
 259                 if (ret < 0) {
 260                         wpa_printf(MSG_INFO, "Failed to configure "
 261                                    "credentials: %s", gnutls_strerror(ret));
 262                         os_free(conn);
 263                         return NULL;
 264                 }
 265         }
 266
 267         if (gnutls_certificate_allocate_credentials(&conn->xcred)) {
 268                 os_free(conn);
 269                 return NULL;
 270         }
 271
 272         return conn;
 273 }
 274
 275
 276 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
 277 {
 278         if (conn == NULL)
 279                 return;
 280
 281         gnutls_certificate_free_credentials(conn->xcred);
 282         gnutls_deinit(conn->session);
 283         os_free(conn->pre_shared_secret);
 284         wpabuf_free(conn->push_buf);
 285         wpabuf_free(conn->pull_buf);
 286         os_free(conn->suffix_match);
 287         os_free(conn->domain_match);
 288         os_free(conn);
 289 }
 290
 291
 292 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
 293 {
 294         return conn ? conn->established : 0;
 295 }
 296
 297
 298 char * tls_connection_peer_serial_num(void *tls_ctx,
 299                                       struct tls_connection *conn)
 300 {
 301         /* TODO */
 302         return NULL;
 303 }
 304
 305
 306 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
 307 {
 308         struct tls_global *global = ssl_ctx;
 309         int ret;
 310
 311         if (conn == NULL)
 312                 return -1;
 313
 314         /* Shutdown previous TLS connection without notifying the peer
 315          * because the connection was already terminated in practice
 316          * and "close notify" shutdown alert would confuse AS. */
 317         gnutls_bye(conn->session, GNUTLS_SHUT_RDWR);
 318         wpabuf_free(conn->push_buf);
 319         conn->push_buf = NULL;
 320         conn->established = 0;
 321
 322         gnutls_deinit(conn->session);
 323         if (tls_gnutls_init_session(global, conn)) {
 324                 wpa_printf(MSG_INFO, "GnuTLS: Failed to preparare new session "
 325                            "for session resumption use");
 326                 return -1;
 327         }
 328
 329         ret = gnutls_credentials_set(conn->session, GNUTLS_CRD_CERTIFICATE,
 330                                      conn->params_set ? conn->xcred :
 331                                      global->xcred);
 332         if (ret < 0) {
 333                 wpa_printf(MSG_INFO, "GnuTLS: Failed to configure credentials "
 334                            "for session resumption: %s", gnutls_strerror(ret));
 335                 return -1;
 336         }
 337
 338         if (global->session_data) {
 339                 ret = gnutls_session_set_data(conn->session,
 340                                               global->session_data,
 341                                               global->session_data_size);
 342                 if (ret < 0) {
 343                         wpa_printf(MSG_INFO, "GnuTLS: Failed to set session "
 344                                    "data: %s", gnutls_strerror(ret));
 345                         return -1;
 346                 }
 347         }
 348
 349         return 0;
 350 }
 351
 352
 353 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
 354                               const struct tls_connection_params *params)
 355 {
 356         int ret;
 357         const char *err;
 358         char prio_buf[100];
 359         const char *prio = NULL;
 360
 361         if (conn == NULL || params == NULL)
 362                 return -1;
 363
 364         if (params->flags & TLS_CONN_REQUIRE_OCSP_ALL) {
 365                 wpa_printf(MSG_INFO,
 366                            "GnuTLS: ocsp=3 not supported");
 367                 return -1;
 368         }
 369
 370         if (params->flags & TLS_CONN_EXT_CERT_CHECK) {
 371                 wpa_printf(MSG_INFO,
 372                            "GnuTLS: tls_ext_cert_check=1 not supported");
 373                 return -1;
 374         }
 375
 376         if (params->subject_match) {
 377                 wpa_printf(MSG_INFO, "GnuTLS: subject_match not supported");
 378                 return -1;
 379         }
 380
 381         if (params->altsubject_match) {
 382                 wpa_printf(MSG_INFO, "GnuTLS: altsubject_match not supported");
 383                 return -1;
 384         }
 385
 386         os_free(conn->suffix_match);
 387         conn->suffix_match = NULL;
 388         if (params->suffix_match) {
 389                 conn->suffix_match = os_strdup(params->suffix_match);
 390                 if (conn->suffix_match == NULL)
 391                         return -1;
 392         }
 393
 394 #if GNUTLS_VERSION_NUMBER >= 0x030300
 395         os_free(conn->domain_match);
 396         conn->domain_match = NULL;
 397         if (params->domain_match) {
 398                 conn->domain_match = os_strdup(params->domain_match);
 399                 if (conn->domain_match == NULL)
 400                         return -1;
 401         }
 402 #else /* < 3.3.0 */
 403         if (params->domain_match) {
 404                 wpa_printf(MSG_INFO, "GnuTLS: domain_match not supported");
 405                 return -1;
 406         }
 407 #endif /* >= 3.3.0 */
 408
 409         conn->flags = params->flags;
 410
 411         if (params->flags & (TLS_CONN_DISABLE_TLSv1_0 |
 412                              TLS_CONN_DISABLE_TLSv1_1 |
 413                              TLS_CONN_DISABLE_TLSv1_2)) {
 414                 os_snprintf(prio_buf, sizeof(prio_buf),
 415                             "NORMAL:-VERS-SSL3.0%s%s%s",
 416                             params->flags & TLS_CONN_DISABLE_TLSv1_0 ?
 417                             ":-VERS-TLS1.0" : "",
 418                             params->flags & TLS_CONN_DISABLE_TLSv1_1 ?
 419                             ":-VERS-TLS1.1" : "",
 420                             params->flags & TLS_CONN_DISABLE_TLSv1_2 ?
 421                             ":-VERS-TLS1.2" : "");
 422                 prio = prio_buf;
 423         }
 424
 425         if (params->openssl_ciphers) {
 426                 if (os_strcmp(params->openssl_ciphers, "SUITEB128") == 0) {
 427                         prio = "SUITEB128";
 428                 } else if (os_strcmp(params->openssl_ciphers,
 429                                      "SUITEB192") == 0) {
 430                         prio = "SUITEB192";
 431                 } else if ((params->flags & TLS_CONN_SUITEB) &&
 432                            os_strcmp(params->openssl_ciphers,
 433                                      "ECDHE-RSA-AES256-GCM-SHA384") == 0) {
 434                         prio = "NONE:+VERS-TLS1.2:+AEAD:+ECDHE-RSA:+AES-256-GCM:+SIGN-RSA-SHA384:+CURVE-SECP384R1:+COMP-NULL";
 435                 } else if (os_strcmp(params->openssl_ciphers,
 436                                      "ECDHE-RSA-AES256-GCM-SHA384") == 0) {
 437                         prio = "NONE:+VERS-TLS1.2:+AEAD:+ECDHE-RSA:+AES-256-GCM:+SIGN-RSA-SHA384:+CURVE-SECP384R1:+COMP-NULL";
 438                 } else if (os_strcmp(params->openssl_ciphers,
 439                                      "DHE-RSA-AES256-GCM-SHA384") == 0) {
 440                         prio = "NONE:+VERS-TLS1.2:+AEAD:+DHE-RSA:+AES-256-GCM:+SIGN-RSA-SHA384:+CURVE-SECP384R1:+COMP-NULL:%PROFILE_HIGH";
 441                 } else if (os_strcmp(params->openssl_ciphers,
 442                                      "ECDHE-ECDSA-AES256-GCM-SHA384") == 0) {
 443                         prio = "NONE:+VERS-TLS1.2:+AEAD:+ECDHE-ECDSA:+AES-256-GCM:+SIGN-RSA-SHA384:+CURVE-SECP384R1:+COMP-NULL";
 444                 } else {
 445                         wpa_printf(MSG_INFO,
 446                                    "GnuTLS: openssl_ciphers not supported");
 447                         return -1;
 448                 }
 449         } else if (params->flags & TLS_CONN_SUITEB) {
 450                 prio = "NONE:+VERS-TLS1.2:+AEAD:+ECDHE-ECDSA:+ECDHE-RSA:+DHE-RSA:+AES-256-GCM:+SIGN-RSA-SHA384:+CURVE-SECP384R1:+COMP-NULL:%PROFILE_HIGH";
 451         }
 452
 453         if (prio) {
 454                 wpa_printf(MSG_DEBUG, "GnuTLS: Set priority string: %s", prio);
 455                 ret = gnutls_priority_set_direct(conn->session, prio, &err);
 456                 if (ret < 0) {
 457                         wpa_printf(MSG_ERROR,
 458                                    "GnuTLS: Priority string failure at '%s'",
 459                                    err);
 460                         return -1;
 461                 }
 462         }
 463
 464         /* TODO: gnutls_certificate_set_verify_flags(xcred, flags);
 465          * to force peer validation(?) */
 466
 467         if (params->ca_cert) {
 468                 wpa_printf(MSG_DEBUG, "GnuTLS: Try to parse %s in DER format",
 469                            params->ca_cert);
 470                 ret = gnutls_certificate_set_x509_trust_file(
 471                         conn->xcred, params->ca_cert, GNUTLS_X509_FMT_DER);
 472                 if (ret < 0) {
 473                         wpa_printf(MSG_DEBUG,
 474                                    "GnuTLS: Failed to read CA cert '%s' in DER format (%s) - try in PEM format",
 475                                    params->ca_cert,
 476                                    gnutls_strerror(ret));
 477                         ret = gnutls_certificate_set_x509_trust_file(
 478                                 conn->xcred, params->ca_cert,
 479                                 GNUTLS_X509_FMT_PEM);
 480                         if (ret < 0) {
 481                                 wpa_printf(MSG_DEBUG,
 482                                            "Failed to read CA cert '%s' in PEM format: %s",
 483                                            params->ca_cert,
 484                                            gnutls_strerror(ret));
 485                                 return -1;
 486                         }
 487                         wpa_printf(MSG_DEBUG,
 488                                    "GnuTLS: Successfully read CA cert '%s' in PEM format",
 489                                    params->ca_cert);
 490                 } else {
 491                         wpa_printf(MSG_DEBUG,
 492                                    "GnuTLS: Successfully read CA cert '%s' in DER format",
 493                                    params->ca_cert);
 494                 }
 495         } else if (params->ca_cert_blob) {
 496                 gnutls_datum_t ca;
 497
 498                 ca.data = (unsigned char *) params->ca_cert_blob;
 499                 ca.size = params->ca_cert_blob_len;
 500
 501                 ret = gnutls_certificate_set_x509_trust_mem(
 502                         conn->xcred, &ca, GNUTLS_X509_FMT_DER);
 503                 if (ret < 0) {
 504                         wpa_printf(MSG_DEBUG,
 505                                    "Failed to parse CA cert in DER format: %s",
 506                                    gnutls_strerror(ret));
 507                         ret = gnutls_certificate_set_x509_trust_mem(
 508                                 conn->xcred, &ca, GNUTLS_X509_FMT_PEM);
 509                         if (ret < 0) {
 510                                 wpa_printf(MSG_DEBUG,
 511                                            "Failed to parse CA cert in PEM format: %s",
 512                                            gnutls_strerror(ret));
 513                                 return -1;
 514                         }
 515                 }
 516         } else if (params->ca_path) {
 517                 wpa_printf(MSG_INFO, "GnuTLS: ca_path not supported");
 518                 return -1;
 519         }
 520
 521         conn->disable_time_checks = 0;
 522         if (params->ca_cert || params->ca_cert_blob) {
 523                 conn->verify_peer = 1;
 524                 gnutls_certificate_set_verify_function(
 525                         conn->xcred, tls_connection_verify_peer);
 526
 527                 if (params->flags & TLS_CONN_ALLOW_SIGN_RSA_MD5) {
 528                         gnutls_certificate_set_verify_flags(
 529                                 conn->xcred, GNUTLS_VERIFY_ALLOW_SIGN_RSA_MD5);
 530                 }
 531
 532                 if (params->flags & TLS_CONN_DISABLE_TIME_CHECKS) {
 533                         conn->disable_time_checks = 1;
 534                         gnutls_certificate_set_verify_flags(
 535                                 conn->xcred,
 536                                 GNUTLS_VERIFY_DISABLE_TIME_CHECKS);
 537                 }
 538         }
 539
 540         if (params->client_cert && params->private_key) {
 541                 wpa_printf(MSG_DEBUG,
 542                            "GnuTLS: Try to parse client cert '%s' and key '%s' in DER format",
 543                            params->client_cert, params->private_key);
 544 #if GNUTLS_VERSION_NUMBER >= 0x03010b
 545                 ret = gnutls_certificate_set_x509_key_file2(
 546                         conn->xcred, params->client_cert, params->private_key,
 547                         GNUTLS_X509_FMT_DER, params->private_key_passwd, 0);
 548 #else
 549                 /* private_key_passwd not (easily) supported here */
 550                 ret = gnutls_certificate_set_x509_key_file(
 551                         conn->xcred, params->client_cert, params->private_key,
 552                         GNUTLS_X509_FMT_DER);
 553 #endif
 554                 if (ret < 0) {
 555                         wpa_printf(MSG_DEBUG,
 556                                    "GnuTLS: Failed to read client cert/key in DER format (%s) - try in PEM format",
 557                                    gnutls_strerror(ret));
 558 #if GNUTLS_VERSION_NUMBER >= 0x03010b
 559                         ret = gnutls_certificate_set_x509_key_file2(
 560                                 conn->xcred, params->client_cert,
 561                                 params->private_key, GNUTLS_X509_FMT_PEM,
 562                                 params->private_key_passwd, 0);
 563 #else
 564                         ret = gnutls_certificate_set_x509_key_file(
 565                                 conn->xcred, params->client_cert,
 566                                 params->private_key, GNUTLS_X509_FMT_PEM);
 567 #endif
 568                         if (ret < 0) {
 569                                 wpa_printf(MSG_DEBUG, "Failed to read client "
 570                                            "cert/key in PEM format: %s",
 571                                            gnutls_strerror(ret));
 572                                 return ret;
 573                         }
 574                         wpa_printf(MSG_DEBUG,
 575                                    "GnuTLS: Successfully read client cert/key in PEM format");
 576                 } else {
 577                         wpa_printf(MSG_DEBUG,
 578                                    "GnuTLS: Successfully read client cert/key in DER format");
 579                 }
 580         } else if (params->private_key) {
 581                 int pkcs12_ok = 0;
 582 #ifdef PKCS12_FUNCS
 583                 /* Try to load in PKCS#12 format */
 584                 wpa_printf(MSG_DEBUG,
 585                            "GnuTLS: Try to parse client cert/key '%s'in PKCS#12 DER format",
 586                            params->private_key);
 587                 ret = gnutls_certificate_set_x509_simple_pkcs12_file(
 588                         conn->xcred, params->private_key, GNUTLS_X509_FMT_DER,
 589                         params->private_key_passwd);
 590                 if (ret != 0) {
 591                         wpa_printf(MSG_DEBUG, "Failed to load private_key in "
 592                                    "PKCS#12 format: %s", gnutls_strerror(ret));
 593                         return -1;
 594                 } else
 595                         pkcs12_ok = 1;
 596 #endif /* PKCS12_FUNCS */
 597
 598                 if (!pkcs12_ok) {
 599                         wpa_printf(MSG_DEBUG, "GnuTLS: PKCS#12 support not "
 600                                    "included");
 601                         return -1;
 602                 }
 603         } else if (params->client_cert_blob && params->private_key_blob) {
 604                 gnutls_datum_t cert, key;
 605
 606                 cert.data = (unsigned char *) params->client_cert_blob;
 607                 cert.size = params->client_cert_blob_len;
 608                 key.data = (unsigned char *) params->private_key_blob;
 609                 key.size = params->private_key_blob_len;
 610
 611 #if GNUTLS_VERSION_NUMBER >= 0x03010b
 612                 ret = gnutls_certificate_set_x509_key_mem2(
 613                         conn->xcred, &cert, &key, GNUTLS_X509_FMT_DER,
 614                         params->private_key_passwd, 0);
 615 #else
 616                 /* private_key_passwd not (easily) supported here */
 617                 ret = gnutls_certificate_set_x509_key_mem(
 618                         conn->xcred, &cert, &key, GNUTLS_X509_FMT_DER);
 619 #endif
 620                 if (ret < 0) {
 621                         wpa_printf(MSG_DEBUG, "Failed to read client cert/key "
 622                                    "in DER format: %s", gnutls_strerror(ret));
 623 #if GNUTLS_VERSION_NUMBER >= 0x03010b
 624                         ret = gnutls_certificate_set_x509_key_mem2(
 625                                 conn->xcred, &cert, &key, GNUTLS_X509_FMT_PEM,
 626                                 params->private_key_passwd, 0);
 627 #else
 628                         /* private_key_passwd not (easily) supported here */
 629                         ret = gnutls_certificate_set_x509_key_mem(
 630                                 conn->xcred, &cert, &key, GNUTLS_X509_FMT_PEM);
 631 #endif
 632                         if (ret < 0) {
 633                                 wpa_printf(MSG_DEBUG, "Failed to read client "
 634                                            "cert/key in PEM format: %s",
 635                                            gnutls_strerror(ret));
 636                                 return ret;
 637                         }
 638                 }
 639         } else if (params->private_key_blob) {
 640 #ifdef PKCS12_FUNCS
 641                 gnutls_datum_t key;
 642
 643                 key.data = (unsigned char *) params->private_key_blob;
 644                 key.size = params->private_key_blob_len;
 645
 646                 /* Try to load in PKCS#12 format */
 647                 ret = gnutls_certificate_set_x509_simple_pkcs12_mem(
 648                         conn->xcred, &key, GNUTLS_X509_FMT_DER,
 649                         params->private_key_passwd);
 650                 if (ret != 0) {
 651                         wpa_printf(MSG_DEBUG, "Failed to load private_key in "
 652                                    "PKCS#12 format: %s", gnutls_strerror(ret));
 653                         return -1;
 654                 }
 655 #else /* PKCS12_FUNCS */
 656                 wpa_printf(MSG_DEBUG, "GnuTLS: PKCS#12 support not included");
 657                 return -1;
 658 #endif /* PKCS12_FUNCS */
 659         }
 660
 661 #if GNUTLS_VERSION_NUMBER >= 0x030103
 662         if (params->flags & (TLS_CONN_REQUEST_OCSP | TLS_CONN_REQUIRE_OCSP)) {
 663                 ret = gnutls_ocsp_status_request_enable_client(conn->session,
 664                                                                NULL, 0, NULL);
 665                 if (ret != GNUTLS_E_SUCCESS) {
 666                         wpa_printf(MSG_INFO,
 667                                    "GnuTLS: Failed to enable OCSP client");
 668                         return -1;
 669                 }
 670         }
 671 #else /* 3.1.3 */
 672         if (params->flags & TLS_CONN_REQUIRE_OCSP) {
 673                 wpa_printf(MSG_INFO,
 674                            "GnuTLS: OCSP not supported by this version of GnuTLS");
 675                 return -1;
 676         }
 677 #endif /* 3.1.3 */
 678
 679         conn->params_set = 1;
 680
 681         ret = gnutls_credentials_set(conn->session, GNUTLS_CRD_CERTIFICATE,
 682                                      conn->xcred);
 683         if (ret < 0) {
 684                 wpa_printf(MSG_INFO, "Failed to configure credentials: %s",
 685                            gnutls_strerror(ret));
 686         }
 687
 688         return ret;
 689 }
 690
 691
 692 #if GNUTLS_VERSION_NUMBER >= 0x030103
 693 static int server_ocsp_status_req(gnutls_session_t session, void *ptr,
 694                                   gnutls_datum_t *resp)
 695 {
 696         struct tls_global *global = ptr;
 697         char *cached;
 698         size_t len;
 699
 700         if (!global->ocsp_stapling_response) {
 701                 wpa_printf(MSG_DEBUG, "GnuTLS: OCSP status callback - no response configured");
 702                 return GNUTLS_E_NO_CERTIFICATE_STATUS;
 703         }
 704
 705         cached = os_readfile(global->ocsp_stapling_response, &len);
 706         if (!cached) {
 707                 wpa_printf(MSG_DEBUG,
 708                            "GnuTLS: OCSP status callback - could not read response file (%s)",
 709                            global->ocsp_stapling_response);
 710                 return GNUTLS_E_NO_CERTIFICATE_STATUS;
 711         }
 712
 713         wpa_printf(MSG_DEBUG,
 714                    "GnuTLS: OCSP status callback - send cached response");
 715         resp->data = gnutls_malloc(len);
 716         if (!resp->data) {
 717                 os_free(resp);
 718                 return GNUTLS_E_MEMORY_ERROR;
 719         }
 720
 721         os_memcpy(resp->data, cached, len);
 722         resp->size = len;
 723         os_free(cached);
 724
 725         return GNUTLS_E_SUCCESS;
 726 }
 727 #endif /* 3.1.3 */
 728
 729
 730 int tls_global_set_params(void *tls_ctx,
 731                           const struct tls_connection_params *params)
 732 {
 733         struct tls_global *global = tls_ctx;
 734         int ret;
 735
 736         /* Currently, global parameters are only set when running in server
 737          * mode. */
 738         global->server = 1;
 739
 740         if (global->params_set) {
 741                 gnutls_certificate_free_credentials(global->xcred);
 742                 global->params_set = 0;
 743         }
 744
 745         ret = gnutls_certificate_allocate_credentials(&global->xcred);
 746         if (ret) {
 747                 wpa_printf(MSG_DEBUG, "Failed to allocate global credentials "
 748                            "%s", gnutls_strerror(ret));
 749                 return -1;
 750         }
 751
 752         if (params->ca_cert) {
 753                 ret = gnutls_certificate_set_x509_trust_file(
 754                         global->xcred, params->ca_cert, GNUTLS_X509_FMT_DER);
 755                 if (ret < 0) {
 756                         wpa_printf(MSG_DEBUG, "Failed to read CA cert '%s' "
 757                                    "in DER format: %s", params->ca_cert,
 758                                    gnutls_strerror(ret));
 759                         ret = gnutls_certificate_set_x509_trust_file(
 760                                 global->xcred, params->ca_cert,
 761                                 GNUTLS_X509_FMT_PEM);
 762                         if (ret < 0) {
 763                                 wpa_printf(MSG_DEBUG, "Failed to read CA cert "
 764                                            "'%s' in PEM format: %s",
 765                                            params->ca_cert,
 766                                            gnutls_strerror(ret));
 767                                 goto fail;
 768                         }
 769                 }
 770
 771                 if (params->flags & TLS_CONN_ALLOW_SIGN_RSA_MD5) {
 772                         gnutls_certificate_set_verify_flags(
 773                                 global->xcred,
 774                                 GNUTLS_VERIFY_ALLOW_SIGN_RSA_MD5);
 775                 }
 776
 777                 if (params->flags & TLS_CONN_DISABLE_TIME_CHECKS) {
 778                         gnutls_certificate_set_verify_flags(
 779                                 global->xcred,
 780                                 GNUTLS_VERIFY_DISABLE_TIME_CHECKS);
 781                 }
 782         }
 783
 784         if (params->client_cert && params->private_key) {
 785                 /* TODO: private_key_passwd? */
 786                 ret = gnutls_certificate_set_x509_key_file(
 787                         global->xcred, params->client_cert,
 788                         params->private_key, GNUTLS_X509_FMT_DER);
 789                 if (ret < 0) {
 790                         wpa_printf(MSG_DEBUG, "Failed to read client cert/key "
 791                                    "in DER format: %s", gnutls_strerror(ret));
 792                         ret = gnutls_certificate_set_x509_key_file(
 793                                 global->xcred, params->client_cert,
 794                                 params->private_key, GNUTLS_X509_FMT_PEM);
 795                         if (ret < 0) {
 796                                 wpa_printf(MSG_DEBUG, "Failed to read client "
 797                                            "cert/key in PEM format: %s",
 798                                            gnutls_strerror(ret));
 799                                 goto fail;
 800                         }
 801                 }
 802         } else if (params->private_key) {
 803                 int pkcs12_ok = 0;
 804 #ifdef PKCS12_FUNCS
 805                 /* Try to load in PKCS#12 format */
 806                 ret = gnutls_certificate_set_x509_simple_pkcs12_file(
 807                         global->xcred, params->private_key,
 808                         GNUTLS_X509_FMT_DER, params->private_key_passwd);
 809                 if (ret != 0) {
 810                         wpa_printf(MSG_DEBUG, "Failed to load private_key in "
 811                                    "PKCS#12 format: %s", gnutls_strerror(ret));
 812                         goto fail;
 813                 } else
 814                         pkcs12_ok = 1;
 815 #endif /* PKCS12_FUNCS */
 816
 817                 if (!pkcs12_ok) {
 818                         wpa_printf(MSG_DEBUG, "GnuTLS: PKCS#12 support not "
 819                                    "included");
 820                         goto fail;
 821                 }
 822         }
 823
 824 #if GNUTLS_VERSION_NUMBER >= 0x030103
 825         os_free(global->ocsp_stapling_response);
 826         if (params->ocsp_stapling_response)
 827                 global->ocsp_stapling_response =
 828                         os_strdup(params->ocsp_stapling_response);
 829         else
 830                 global->ocsp_stapling_response = NULL;
 831         gnutls_certificate_set_ocsp_status_request_function(
 832                 global->xcred, server_ocsp_status_req, global);
 833 #endif /* 3.1.3 */
 834
 835         global->params_set = 1;
 836
 837         return 0;
 838
 839 fail:
 840         gnutls_certificate_free_credentials(global->xcred);
 841         return -1;
 842 }
 843
 844
 845 int tls_global_set_verify(void *ssl_ctx, int check_crl)
 846 {
 847         /* TODO */
 848         return 0;
 849 }
 850
 851
 852 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
 853                               int verify_peer, unsigned int flags,
 854                               const u8 *session_ctx, size_t session_ctx_len)
 855 {
 856         if (conn == NULL || conn->session == NULL)
 857                 return -1;
 858
 859         conn->verify_peer = verify_peer;
 860         gnutls_certificate_server_set_request(conn->session,
 861                                               verify_peer ? GNUTLS_CERT_REQUIRE
 862                                               : GNUTLS_CERT_REQUEST);
 863
 864         return 0;
 865 }
 866
 867
 868 int tls_connection_get_random(void *ssl_ctx, struct tls_connection *conn,
 869                             struct tls_random *keys)
 870 {
 871 #if GNUTLS_VERSION_NUMBER >= 0x030012
 872         gnutls_datum_t client, server;
 873
 874         if (conn == NULL || conn->session == NULL || keys == NULL)
 875                 return -1;
 876
 877         os_memset(keys, 0, sizeof(*keys));
 878         gnutls_session_get_random(conn->session, &client, &server);
 879         keys->client_random = client.data;
 880         keys->server_random = server.data;
 881         keys->client_random_len = client.size;
 882         keys->server_random_len = client.size;
 883
 884         return 0;
 885 #else /* 3.0.18 */
 886         return -1;
 887 #endif /* 3.0.18 */
 888 }
 889
 890
 891 int tls_connection_export_key(void *tls_ctx, struct tls_connection *conn,
 892                               const char *label, u8 *out, size_t out_len)
 893 {
 894         if (conn == NULL || conn->session == NULL)
 895                 return -1;
 896
 897         return gnutls_prf(conn->session, os_strlen(label), label,
 898                           0 /* client_random first */, 0, NULL, out_len,
 899                           (char *) out);
 900 }
 901
 902
 903 int tls_connection_get_eap_fast_key(void *tls_ctx, struct tls_connection *conn,
 904                                     u8 *out, size_t out_len)
 905 {
 906         return -1;
 907 }
 908
 909
 910 static void gnutls_tls_fail_event(struct tls_connection *conn,
 911                                   const gnutls_datum_t *cert, int depth,
 912                                   const char *subject, const char *err_str,
 913                                   enum tls_fail_reason reason)
 914 {
 915         union tls_event_data ev;
 916         struct tls_global *global = conn->global;
 917         struct wpabuf *cert_buf = NULL;
 918
 919         if (global->event_cb == NULL)
 920                 return;
 921
 922         os_memset(&ev, 0, sizeof(ev));
 923         ev.cert_fail.depth = depth;
 924         ev.cert_fail.subject = subject ? subject : "";
 925         ev.cert_fail.reason = reason;
 926         ev.cert_fail.reason_txt = err_str;
 927         if (cert) {
 928                 cert_buf = wpabuf_alloc_copy(cert->data, cert->size);
 929                 ev.cert_fail.cert = cert_buf;
 930         }
 931         global->event_cb(global->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
 932         wpabuf_free(cert_buf);
 933 }
 934
 935
 936 #if GNUTLS_VERSION_NUMBER < 0x030300
 937 static int server_eku_purpose(gnutls_x509_crt_t cert)
 938 {
 939         unsigned int i;
 940
 941         for (i = 0; ; i++) {
 942                 char oid[128];
 943                 size_t oid_size = sizeof(oid);
 944                 int res;
 945
 946                 res = gnutls_x509_crt_get_key_purpose_oid(cert, i, oid,
 947                                                           &oid_size, NULL);
 948                 if (res == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
 949                         if (i == 0) {
 950                                 /* No EKU - assume any use allowed */
 951                                 return 1;
 952                         }
 953                         break;
 954                 }
 955
 956                 if (res < 0) {
 957                         wpa_printf(MSG_INFO, "GnuTLS: Failed to get EKU");
 958                         return 0;
 959                 }
 960
 961                 wpa_printf(MSG_DEBUG, "GnuTLS: Certificate purpose: %s", oid);
 962                 if (os_strcmp(oid, GNUTLS_KP_TLS_WWW_SERVER) == 0 ||
 963                     os_strcmp(oid, GNUTLS_KP_ANY) == 0)
 964                         return 1;
 965         }
 966
 967         return 0;
 968 }
 969 #endif /* < 3.3.0 */
 970
 971
 972 static int check_ocsp(struct tls_connection *conn, gnutls_session_t session,
 973                       gnutls_alert_description_t *err)
 974 {
 975 #if GNUTLS_VERSION_NUMBER >= 0x030103
 976         gnutls_datum_t response, buf;
 977         gnutls_ocsp_resp_t resp;
 978         unsigned int cert_status;
 979         int res;
 980
 981         if (!(conn->flags & (TLS_CONN_REQUEST_OCSP | TLS_CONN_REQUIRE_OCSP)))
 982                 return 0;
 983
 984         if (!gnutls_ocsp_status_request_is_checked(session, 0)) {
 985                 if (conn->flags & TLS_CONN_REQUIRE_OCSP) {
 986                         wpa_printf(MSG_INFO,
 987                                    "GnuTLS: No valid OCSP response received");
 988                         goto ocsp_error;
 989                 }
 990
 991                 wpa_printf(MSG_DEBUG,
 992                            "GnuTLS: Valid OCSP response was not received - continue since OCSP was not required");
 993                 return 0;
 994         }
 995
 996         /*
 997          * GnuTLS has already verified the OCSP response in
 998          * check_ocsp_response() and rejected handshake if the certificate was
 999          * found to be revoked. However, if the response indicates that the
1000          * status is unknown, handshake continues and reaches here. We need to
1001          * re-import the OCSP response to check for unknown certificate status,
1002          * but we do not need to repeat gnutls_ocsp_resp_check_crt() and
1003          * gnutls_ocsp_resp_verify_direct() calls.
1004          */
1005
1006         res = gnutls_ocsp_status_request_get(session, &response);
1007         if (res != GNUTLS_E_SUCCESS) {
1008                 wpa_printf(MSG_INFO,
1009                            "GnuTLS: OCSP response was received, but it was not valid");
1010                 goto ocsp_error;
1011         }
1012
1013         if (gnutls_ocsp_resp_init(&resp) != GNUTLS_E_SUCCESS)
1014                 goto ocsp_error;
1015
1016         res = gnutls_ocsp_resp_import(resp, &response);
1017         if (res != GNUTLS_E_SUCCESS) {
1018                 wpa_printf(MSG_INFO,
1019                            "GnuTLS: Could not parse received OCSP response: %s",
1020                            gnutls_strerror(res));
1021                 gnutls_ocsp_resp_deinit(resp);
1022                 goto ocsp_error;
1023         }
1024
1025         res = gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_FULL, &buf);
1026         if (res == GNUTLS_E_SUCCESS) {
1027                 wpa_printf(MSG_DEBUG, "GnuTLS: %s", buf.data);
1028                 gnutls_free(buf.data);
1029         }
1030
1031         res = gnutls_ocsp_resp_get_single(resp, 0, NULL, NULL, NULL,
1032                                           NULL, &cert_status, NULL,
1033                                           NULL, NULL, NULL);
1034         gnutls_ocsp_resp_deinit(resp);
1035         if (res != GNUTLS_E_SUCCESS) {
1036                 wpa_printf(MSG_INFO,
1037                            "GnuTLS: Failed to extract OCSP information: %s",
1038                            gnutls_strerror(res));
1039                 goto ocsp_error;
1040         }
1041
1042         if (cert_status == GNUTLS_OCSP_CERT_GOOD) {
1043                 wpa_printf(MSG_DEBUG, "GnuTLS: OCSP cert status: good");
1044         } else if (cert_status == GNUTLS_OCSP_CERT_REVOKED) {
1045                 wpa_printf(MSG_DEBUG,
1046                            "GnuTLS: OCSP cert status: revoked");
1047                 goto ocsp_error;
1048         } else {
1049                 wpa_printf(MSG_DEBUG,
1050                            "GnuTLS: OCSP cert status: unknown");
1051                 if (conn->flags & TLS_CONN_REQUIRE_OCSP)
1052                         goto ocsp_error;
1053                 wpa_printf(MSG_DEBUG,
1054                            "GnuTLS: OCSP was not required, so allow connection to continue");
1055         }
1056
1057         return 0;
1058
1059 ocsp_error:
1060         gnutls_tls_fail_event(conn, NULL, 0, NULL,
1061                               "bad certificate status response",
1062                               TLS_FAIL_REVOKED);
1063         *err = GNUTLS_A_CERTIFICATE_REVOKED;
1064         return -1;
1065 #else /* GnuTLS 3.1.3 or newer */
1066         return 0;
1067 #endif /* GnuTLS 3.1.3 or newer */
1068 }
1069
1070
1071 static int tls_connection_verify_peer(gnutls_session_t session)
1072 {
1073         struct tls_connection *conn;
1074         unsigned int status, num_certs, i;
1075         struct os_time now;
1076         const gnutls_datum_t *certs;
1077         gnutls_x509_crt_t cert;
1078         gnutls_alert_description_t err;
1079         int res;
1080
1081         conn = gnutls_session_get_ptr(session);
1082         if (!conn->verify_peer) {
1083                 wpa_printf(MSG_DEBUG,
1084                            "GnuTLS: No peer certificate verification enabled");
1085                 return 0;
1086         }
1087
1088         wpa_printf(MSG_DEBUG, "GnuTSL: Verifying peer certificate");
1089
1090 #if GNUTLS_VERSION_NUMBER >= 0x030300
1091         {
1092                 gnutls_typed_vdata_st data[1];
1093                 unsigned int elements = 0;
1094
1095                 os_memset(data, 0, sizeof(data));
1096                 if (!conn->global->server) {
1097                         data[elements].type = GNUTLS_DT_KEY_PURPOSE_OID;
1098                         data[elements].data = (void *) GNUTLS_KP_TLS_WWW_SERVER;
1099                         elements++;
1100                 }
1101                 res = gnutls_certificate_verify_peers(session, data, 1,
1102                                                       &status);
1103         }
1104 #else /* < 3.3.0 */
1105         res = gnutls_certificate_verify_peers2(session, &status);
1106 #endif
1107         if (res < 0) {
1108                 wpa_printf(MSG_INFO, "TLS: Failed to verify peer "
1109                            "certificate chain");
1110                 err = GNUTLS_A_INTERNAL_ERROR;
1111                 goto out;
1112         }
1113
1114 #if GNUTLS_VERSION_NUMBER >= 0x030104
1115         {
1116                 gnutls_datum_t info;
1117                 int ret, type;
1118
1119                 type = gnutls_certificate_type_get(session);
1120                 ret = gnutls_certificate_verification_status_print(status, type,
1121                                                                    &info, 0);
1122                 if (ret < 0) {
1123                         wpa_printf(MSG_DEBUG,
1124                                    "GnuTLS: Failed to print verification status");
1125                         err = GNUTLS_A_INTERNAL_ERROR;
1126                         goto out;
1127                 }
1128                 wpa_printf(MSG_DEBUG, "GnuTLS: %s", info.data);
1129                 gnutls_free(info.data);
1130         }
1131 #endif /* GnuTLS 3.1.4 or newer */
1132
1133         certs = gnutls_certificate_get_peers(session, &num_certs);
1134         if (certs == NULL || num_certs == 0) {
1135                 wpa_printf(MSG_INFO, "TLS: No peer certificate chain received");
1136                 err = GNUTLS_A_UNKNOWN_CA;
1137                 goto out;
1138         }
1139
1140         if (conn->verify_peer && (status & GNUTLS_CERT_INVALID)) {
1141                 wpa_printf(MSG_INFO, "TLS: Peer certificate not trusted");
1142                 if (status & GNUTLS_CERT_INSECURE_ALGORITHM) {
1143                         wpa_printf(MSG_INFO, "TLS: Certificate uses insecure "
1144                                    "algorithm");
1145                         gnutls_tls_fail_event(conn, NULL, 0, NULL,
1146                                               "certificate uses insecure algorithm",
1147                                               TLS_FAIL_BAD_CERTIFICATE);
1148                         err = GNUTLS_A_INSUFFICIENT_SECURITY;
1149                         goto out;
1150                 }
1151                 if (status & GNUTLS_CERT_NOT_ACTIVATED) {
1152                         wpa_printf(MSG_INFO, "TLS: Certificate not yet "
1153                                    "activated");
1154                         gnutls_tls_fail_event(conn, NULL, 0, NULL,
1155                                               "certificate not yet valid",
1156                                               TLS_FAIL_NOT_YET_VALID);
1157                         err = GNUTLS_A_CERTIFICATE_EXPIRED;
1158                         goto out;
1159                 }
1160                 if (status & GNUTLS_CERT_EXPIRED) {
1161                         wpa_printf(MSG_INFO, "TLS: Certificate expired");
1162                         gnutls_tls_fail_event(conn, NULL, 0, NULL,
1163                                               "certificate has expired",
1164                                               TLS_FAIL_EXPIRED);
1165                         err = GNUTLS_A_CERTIFICATE_EXPIRED;
1166                         goto out;
1167                 }
1168                 gnutls_tls_fail_event(conn, NULL, 0, NULL,
1169                                       "untrusted certificate",
1170                                       TLS_FAIL_UNTRUSTED);
1171                 err = GNUTLS_A_INTERNAL_ERROR;
1172                 goto out;
1173         }
1174
1175         if (status & GNUTLS_CERT_SIGNER_NOT_FOUND) {
1176                 wpa_printf(MSG_INFO, "TLS: Peer certificate does not have a "
1177                            "known issuer");
1178                 gnutls_tls_fail_event(conn, NULL, 0, NULL, "signed not found",
1179                                       TLS_FAIL_UNTRUSTED);
1180                 err = GNUTLS_A_UNKNOWN_CA;
1181                 goto out;
1182         }
1183
1184         if (status & GNUTLS_CERT_REVOKED) {
1185                 wpa_printf(MSG_INFO, "TLS: Peer certificate has been revoked");
1186                 gnutls_tls_fail_event(conn, NULL, 0, NULL,
1187                                       "certificate revoked",
1188                                       TLS_FAIL_REVOKED);
1189                 err = GNUTLS_A_CERTIFICATE_REVOKED;
1190                 goto out;
1191         }
1192
1193         if (status != 0) {
1194                 wpa_printf(MSG_INFO, "TLS: Unknown verification status: %d",
1195                            status);
1196                 err = GNUTLS_A_INTERNAL_ERROR;
1197                 goto out;
1198         }
1199
1200         if (check_ocsp(conn, session, &err))
1201                 goto out;
1202
1203         os_get_time(&now);
1204
1205         for (i = 0; i < num_certs; i++) {
1206                 char *buf;
1207                 size_t len;
1208                 if (gnutls_x509_crt_init(&cert) < 0) {
1209                         wpa_printf(MSG_INFO, "TLS: Certificate initialization "
1210                                    "failed");
1211                         err = GNUTLS_A_BAD_CERTIFICATE;
1212                         goto out;
1213                 }
1214
1215                 if (gnutls_x509_crt_import(cert, &certs[i],
1216                                            GNUTLS_X509_FMT_DER) < 0) {
1217                         wpa_printf(MSG_INFO, "TLS: Could not parse peer "
1218                                    "certificate %d/%d", i + 1, num_certs);
1219                         gnutls_x509_crt_deinit(cert);
1220                         err = GNUTLS_A_BAD_CERTIFICATE;
1221                         goto out;
1222                 }
1223
1224                 gnutls_x509_crt_get_dn(cert, NULL, &len);
1225                 len++;
1226                 buf = os_malloc(len + 1);
1227                 if (buf) {
1228                         buf[0] = buf[len] = '\0';
1229                         gnutls_x509_crt_get_dn(cert, buf, &len);
1230                 }
1231                 wpa_printf(MSG_DEBUG, "TLS: Peer cert chain %d/%d: %s",
1232                            i + 1, num_certs, buf);
1233
1234                 if (conn->global->event_cb) {
1235                         struct wpabuf *cert_buf = NULL;
1236                         union tls_event_data ev;
1237 #ifdef CONFIG_SHA256
1238                         u8 hash[32];
1239                         const u8 *_addr[1];
1240                         size_t _len[1];
1241 #endif /* CONFIG_SHA256 */
1242
1243                         os_memset(&ev, 0, sizeof(ev));
1244                         if (conn->global->cert_in_cb) {
1245                                 cert_buf = wpabuf_alloc_copy(certs[i].data,
1246                                                              certs[i].size);
1247                                 ev.peer_cert.cert = cert_buf;
1248                         }
1249 #ifdef CONFIG_SHA256
1250                         _addr[0] = certs[i].data;
1251                         _len[0] = certs[i].size;
1252                         if (sha256_vector(1, _addr, _len, hash) == 0) {
1253                                 ev.peer_cert.hash = hash;
1254                                 ev.peer_cert.hash_len = sizeof(hash);
1255                         }
1256 #endif /* CONFIG_SHA256 */
1257                         ev.peer_cert.depth = i;
1258                         ev.peer_cert.subject = buf;
1259                         conn->global->event_cb(conn->global->cb_ctx,
1260                                                TLS_PEER_CERTIFICATE, &ev);
1261                         wpabuf_free(cert_buf);
1262                 }
1263
1264                 if (i == 0) {
1265                         if (conn->suffix_match &&
1266                             !gnutls_x509_crt_check_hostname(
1267                                     cert, conn->suffix_match)) {
1268                                 wpa_printf(MSG_WARNING,
1269                                            "TLS: Domain suffix match '%s' not found",
1270                                            conn->suffix_match);
1271                                 gnutls_tls_fail_event(
1272                                         conn, &certs[i], i, buf,
1273                                         "Domain suffix mismatch",
1274                                         TLS_FAIL_DOMAIN_SUFFIX_MISMATCH);
1275                                 err = GNUTLS_A_BAD_CERTIFICATE;
1276                                 gnutls_x509_crt_deinit(cert);
1277                                 os_free(buf);
1278                                 goto out;
1279                         }
1280
1281 #if GNUTLS_VERSION_NUMBER >= 0x030300
1282                         if (conn->domain_match &&
1283                             !gnutls_x509_crt_check_hostname2(
1284                                     cert, conn->domain_match,
1285                                     GNUTLS_VERIFY_DO_NOT_ALLOW_WILDCARDS)) {
1286                                 wpa_printf(MSG_WARNING,
1287                                            "TLS: Domain match '%s' not found",
1288                                            conn->domain_match);
1289                                 gnutls_tls_fail_event(
1290                                         conn, &certs[i], i, buf,
1291                                         "Domain mismatch",
1292                                         TLS_FAIL_DOMAIN_MISMATCH);
1293                                 err = GNUTLS_A_BAD_CERTIFICATE;
1294                                 gnutls_x509_crt_deinit(cert);
1295                                 os_free(buf);
1296                                 goto out;
1297                         }
1298 #endif /* >= 3.3.0 */
1299
1300                         /* TODO: validate altsubject_match.
1301                          * For now, any such configuration is rejected in
1302                          * tls_connection_set_params() */
1303
1304 #if GNUTLS_VERSION_NUMBER < 0x030300
1305                         /*
1306                          * gnutls_certificate_verify_peers() not available, so
1307                          * need to check EKU separately.
1308                          */
1309                         if (!conn->global->server &&
1310                             !server_eku_purpose(cert)) {
1311                                 wpa_printf(MSG_WARNING,
1312                                            "GnuTLS: No server EKU");
1313                                 gnutls_tls_fail_event(
1314                                         conn, &certs[i], i, buf,
1315                                         "No server EKU",
1316                                         TLS_FAIL_BAD_CERTIFICATE);
1317                                 err = GNUTLS_A_BAD_CERTIFICATE;
1318                                 gnutls_x509_crt_deinit(cert);
1319                                 os_free(buf);
1320                                 goto out;
1321                         }
1322 #endif /* < 3.3.0 */
1323                 }
1324
1325                 if (!conn->disable_time_checks &&
1326                     (gnutls_x509_crt_get_expiration_time(cert) < now.sec ||
1327                      gnutls_x509_crt_get_activation_time(cert) > now.sec)) {
1328                         wpa_printf(MSG_INFO, "TLS: Peer certificate %d/%d is "
1329                                    "not valid at this time",
1330                                    i + 1, num_certs);
1331                         gnutls_tls_fail_event(
1332                                 conn, &certs[i], i, buf,
1333                                 "Certificate is not valid at this time",
1334                                 TLS_FAIL_EXPIRED);
1335                         gnutls_x509_crt_deinit(cert);
1336                         os_free(buf);
1337                         err = GNUTLS_A_CERTIFICATE_EXPIRED;
1338                         goto out;
1339                 }
1340
1341                 os_free(buf);
1342
1343                 gnutls_x509_crt_deinit(cert);
1344         }
1345
1346         if (conn->global->event_cb != NULL)
1347                 conn->global->event_cb(conn->global->cb_ctx,
1348                                        TLS_CERT_CHAIN_SUCCESS, NULL);
1349
1350         return 0;
1351
1352 out:
1353         conn->failed++;
1354         gnutls_alert_send(session, GNUTLS_AL_FATAL, err);
1355         return GNUTLS_E_CERTIFICATE_ERROR;
1356 }
1357
1358
1359 static struct wpabuf * gnutls_get_appl_data(struct tls_connection *conn)
1360 {
1361         int res;
1362         struct wpabuf *ad;
1363         wpa_printf(MSG_DEBUG, "GnuTLS: Check for possible Application Data");
1364         ad = wpabuf_alloc((wpabuf_len(conn->pull_buf) + 500) * 3);
1365         if (ad == NULL)
1366                 return NULL;
1367
1368         res = gnutls_record_recv(conn->session, wpabuf_mhead(ad),
1369                                  wpabuf_size(ad));
1370         wpa_printf(MSG_DEBUG, "GnuTLS: gnutls_record_recv: %d", res);
1371         if (res < 0) {
1372                 wpa_printf(MSG_DEBUG, "%s - gnutls_record_recv failed: %d "
1373                            "(%s)", __func__, (int) res,
1374                            gnutls_strerror(res));
1375                 wpabuf_free(ad);
1376                 return NULL;
1377         }
1378
1379         wpabuf_put(ad, res);
1380         wpa_printf(MSG_DEBUG, "GnuTLS: Received %d bytes of Application Data",
1381                    res);
1382         return ad;
1383 }
1384
1385
1386 struct wpabuf * tls_connection_handshake(void *tls_ctx,
1387                                          struct tls_connection *conn,
1388                                          const struct wpabuf *in_data,
1389                                          struct wpabuf **appl_data)
1390 {
1391         struct tls_global *global = tls_ctx;
1392         struct wpabuf *out_data;
1393         int ret;
1394
1395         if (appl_data)
1396                 *appl_data = NULL;
1397
1398         if (in_data && wpabuf_len(in_data) > 0) {
1399                 if (conn->pull_buf) {
1400                         wpa_printf(MSG_DEBUG, "%s - %lu bytes remaining in "
1401                                    "pull_buf", __func__,
1402                                    (unsigned long) wpabuf_len(conn->pull_buf));
1403                         wpabuf_free(conn->pull_buf);
1404                 }
1405                 conn->pull_buf = wpabuf_dup(in_data);
1406                 if (conn->pull_buf == NULL)
1407                         return NULL;
1408                 conn->pull_buf_offset = wpabuf_head(conn->pull_buf);
1409         }
1410
1411         ret = gnutls_handshake(conn->session);
1412         if (ret < 0) {
1413                 gnutls_alert_description_t alert;
1414                 union tls_event_data ev;
1415
1416                 switch (ret) {
1417                 case GNUTLS_E_AGAIN:
1418                         if (global->server && conn->established &&
1419                             conn->push_buf == NULL) {
1420                                 /* Need to return something to trigger
1421                                  * completion of EAP-TLS. */
1422                                 conn->push_buf = wpabuf_alloc(0);
1423                         }
1424                         break;
1425                 case GNUTLS_E_DH_PRIME_UNACCEPTABLE:
1426                         wpa_printf(MSG_DEBUG, "GnuTLS: Unacceptable DH prime");
1427                         if (conn->global->event_cb) {
1428                                 os_memset(&ev, 0, sizeof(ev));
1429                                 ev.alert.is_local = 1;
1430                                 ev.alert.type = "fatal";
1431                                 ev.alert.description = "insufficient security";
1432                                 conn->global->event_cb(conn->global->cb_ctx,
1433                                                        TLS_ALERT, &ev);
1434                         }
1435                         /*
1436                          * Could send a TLS Alert to the server, but for now,
1437                          * simply terminate handshake.
1438                          */
1439                         conn->failed++;
1440                         conn->write_alerts++;
1441                         break;
1442                 case GNUTLS_E_FATAL_ALERT_RECEIVED:
1443                         alert = gnutls_alert_get(conn->session);
1444                         wpa_printf(MSG_DEBUG, "%s - received fatal '%s' alert",
1445                                    __func__, gnutls_alert_get_name(alert));
1446                         conn->read_alerts++;
1447                         if (conn->global->event_cb != NULL) {
1448                                 os_memset(&ev, 0, sizeof(ev));
1449                                 ev.alert.is_local = 0;
1450                                 ev.alert.type = gnutls_alert_get_name(alert);
1451                                 ev.alert.description = ev.alert.type;
1452                                 conn->global->event_cb(conn->global->cb_ctx,
1453                                                        TLS_ALERT, &ev);
1454                         }
1455                         /* continue */
1456                 default:
1457                         wpa_printf(MSG_DEBUG, "%s - gnutls_handshake failed "
1458                                    "-> %s", __func__, gnutls_strerror(ret));
1459                         conn->failed++;
1460                 }
1461         } else {
1462                 size_t size;
1463
1464                 wpa_printf(MSG_DEBUG, "TLS: Handshake completed successfully");
1465
1466 #if GNUTLS_VERSION_NUMBER >= 0x03010a
1467                 {
1468                         char *desc;
1469
1470                         desc = gnutls_session_get_desc(conn->session);
1471                         if (desc) {
1472                                 wpa_printf(MSG_DEBUG, "GnuTLS: %s", desc);
1473                                 gnutls_free(desc);
1474                         }
1475                 }
1476 #endif /* GnuTLS 3.1.10 or newer */
1477
1478                 conn->established = 1;
1479                 if (conn->push_buf == NULL) {
1480                         /* Need to return something to get final TLS ACK. */
1481                         conn->push_buf = wpabuf_alloc(0);
1482                 }
1483
1484                 gnutls_session_get_data(conn->session, NULL, &size);
1485                 if (global->session_data == NULL ||
1486                     global->session_data_size < size) {
1487                         os_free(global->session_data);
1488                         global->session_data = os_malloc(size);
1489                 }
1490                 if (global->session_data) {
1491                         global->session_data_size = size;
1492                         gnutls_session_get_data(conn->session,
1493                                                 global->session_data,
1494                                                 &global->session_data_size);
1495                 }
1496
1497                 if (conn->pull_buf && appl_data)
1498                         *appl_data = gnutls_get_appl_data(conn);
1499         }
1500
1501         out_data = conn->push_buf;
1502         conn->push_buf = NULL;
1503         return out_data;
1504 }
1505
1506
1507 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
1508                                                 struct tls_connection *conn,
1509                                                 const struct wpabuf *in_data,
1510                                                 struct wpabuf **appl_data)
1511 {
1512         return tls_connection_handshake(tls_ctx, conn, in_data, appl_data);
1513 }
1514
1515
1516 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
1517                                        struct tls_connection *conn,
1518                                        const struct wpabuf *in_data)
1519 {
1520         ssize_t res;
1521         struct wpabuf *buf;
1522
1523         res = gnutls_record_send(conn->session, wpabuf_head(in_data),
1524                                  wpabuf_len(in_data));
1525         if (res < 0) {
1526                 wpa_printf(MSG_INFO, "%s: Encryption failed: %s",
1527                            __func__, gnutls_strerror(res));
1528                 return NULL;
1529         }
1530
1531         buf = conn->push_buf;
1532         conn->push_buf = NULL;
1533         return buf;
1534 }
1535
1536
1537 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
1538                                        struct tls_connection *conn,
1539                                        const struct wpabuf *in_data)
1540 {
1541         ssize_t res;
1542         struct wpabuf *out;
1543
1544         if (conn->pull_buf) {
1545                 wpa_printf(MSG_DEBUG, "%s - %lu bytes remaining in "
1546                            "pull_buf", __func__,
1547                            (unsigned long) wpabuf_len(conn->pull_buf));
1548                 wpabuf_free(conn->pull_buf);
1549         }
1550         conn->pull_buf = wpabuf_dup(in_data);
1551         if (conn->pull_buf == NULL)
1552                 return NULL;
1553         conn->pull_buf_offset = wpabuf_head(conn->pull_buf);
1554
1555         /*
1556          * Even though we try to disable TLS compression, it is possible that
1557          * this cannot be done with all TLS libraries. Add extra buffer space
1558          * to handle the possibility of the decrypted data being longer than
1559          * input data.
1560          */
1561         out = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
1562         if (out == NULL)
1563                 return NULL;
1564
1565         res = gnutls_record_recv(conn->session, wpabuf_mhead(out),
1566                                  wpabuf_size(out));
1567         if (res < 0) {
1568                 wpa_printf(MSG_DEBUG, "%s - gnutls_record_recv failed: %d "
1569                            "(%s)", __func__, (int) res, gnutls_strerror(res));
1570                 wpabuf_free(out);
1571                 return NULL;
1572         }
1573         wpabuf_put(out, res);
1574
1575         return out;
1576 }
1577
1578
1579 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
1580 {
1581         if (conn == NULL)
1582                 return 0;
1583         return gnutls_session_is_resumed(conn->session);
1584 }
1585
1586
1587 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
1588                                    u8 *ciphers)
1589 {
1590         /* TODO */
1591         return -1;
1592 }
1593
1594
1595 int tls_get_version(void *ssl_ctx, struct tls_connection *conn,
1596                     char *buf, size_t buflen)
1597 {
1598         gnutls_protocol_t ver;
1599
1600         ver = gnutls_protocol_get_version(conn->session);
1601         if (ver == GNUTLS_TLS1_0)
1602                 os_strlcpy(buf, "TLSv1", buflen);
1603         else if (ver == GNUTLS_TLS1_1)
1604                 os_strlcpy(buf, "TLSv1.1", buflen);
1605         else if (ver == GNUTLS_TLS1_2)
1606                 os_strlcpy(buf, "TLSv1.2", buflen);
1607         else
1608                 return -1;
1609         return 0;
1610 }
1611
1612
1613 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
1614                    char *buf, size_t buflen)
1615 {
1616         gnutls_cipher_algorithm_t cipher;
1617         gnutls_kx_algorithm_t kx;
1618         gnutls_mac_algorithm_t mac;
1619         const char *kx_str, *cipher_str, *mac_str;
1620         int res;
1621
1622         cipher = gnutls_cipher_get(conn->session);
1623         cipher_str = gnutls_cipher_get_name(cipher);
1624         if (!cipher_str)
1625                 cipher_str = "";
1626
1627         kx = gnutls_kx_get(conn->session);
1628         kx_str = gnutls_kx_get_name(kx);
1629         if (!kx_str)
1630                 kx_str = "";
1631
1632         mac = gnutls_mac_get(conn->session);
1633         mac_str = gnutls_mac_get_name(mac);
1634         if (!mac_str)
1635                 mac_str = "";
1636
1637         if (kx == GNUTLS_KX_RSA)
1638                 res = os_snprintf(buf, buflen, "%s-%s", cipher_str, mac_str);
1639         else
1640                 res = os_snprintf(buf, buflen, "%s-%s-%s",
1641                                   kx_str, cipher_str, mac_str);
1642         if (os_snprintf_error(buflen, res))
1643                 return -1;
1644
1645         return 0;
1646 }
1647
1648
1649 int tls_connection_enable_workaround(void *ssl_ctx,
1650                                      struct tls_connection *conn)
1651 {
1652         gnutls_record_disable_padding(conn->session);
1653         return 0;
1654 }
1655
1656
1657 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
1658                                     int ext_type, const u8 *data,
1659                                     size_t data_len)
1660 {
1661         /* TODO */
1662         return -1;
1663 }
1664
1665
1666 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
1667 {
1668         if (conn == NULL)
1669                 return -1;
1670         return conn->failed;
1671 }
1672
1673
1674 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
1675 {
1676         if (conn == NULL)
1677                 return -1;
1678         return conn->read_alerts;
1679 }
1680
1681
1682 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
1683 {
1684         if (conn == NULL)
1685                 return -1;
1686         return conn->write_alerts;
1687 }
1688
1689
1690 int tls_connection_set_session_ticket_cb(void *tls_ctx,
1691                                          struct tls_connection *conn,
1692                                          tls_session_ticket_cb cb, void *ctx)
1693 {
1694         return -1;
1695 }
1696
1697
1698 int tls_get_library_version(char *buf, size_t buf_len)
1699 {
1700         return os_snprintf(buf, buf_len, "GnuTLS build=%s run=%s",
1701                            GNUTLS_VERSION, gnutls_check_version(NULL));
1702 }
1703
1704
1705 void tls_connection_set_success_data(struct tls_connection *conn,
1706                                      struct wpabuf *data)
1707 {
1708 }
1709
1710
1711 void tls_connection_set_success_data_resumed(struct tls_connection *conn)
1712 {
1713 }
1714
1715
1716 const struct wpabuf *
1717 tls_connection_get_success_data(struct tls_connection *conn)
1718 {
1719         return NULL;
1720 }
1721
1722
1723 void tls_connection_remove_session(struct tls_connection *conn)
1724 {
1725 }