src/common/ssl_certificate.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2012 Colin Leroy <colin@colino.net>
   4  * and the Claws Mail team
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #  include "config.h"
  23 #include "claws-features.h"
  24 #endif
  25
  26 #ifdef USE_GNUTLS
  27 #include <gnutls/gnutls.h>
  28 #include <gnutls/x509.h>
  29 #include <gnutls/pkcs12.h>
  30 #include <sys/stat.h>
  31 #include <unistd.h>
  32 #include <string.h>
  33 #include <sys/types.h>
  34 #include <stdio.h>
  35 #include <glib.h>
  36 #include <glib/gi18n.h>
  37 #ifdef G_OS_WIN32
  38 #  include <winsock2.h>
  39 #else
  40 #  include <sys/socket.h>
  41 #  include <netinet/in.h>
  42 #  include <netdb.h>
  43 #endif /* G_OS_WIN32 */
  44 #include "ssl_certificate.h"
  45 #include "utils.h"
  46 #include "log.h"
  47 #include "socket.h"
  48 #include "hooks.h"
  49 #include "defs.h"
  50
  51 static GHashTable *warned_expired = NULL;
  52
  53 gboolean prefs_common_unsafe_ssl_certs(void);
  54
  55 static gchar *get_certificate_path(const gchar *host, const gchar *port, const gchar *fp)
  56 {
  57         if (fp != NULL && prefs_common_unsafe_ssl_certs())
  58                 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
  59                           "certs", G_DIR_SEPARATOR_S,
  60                           host, ".", port, ".", fp, ".cert", NULL);
  61         else
  62                 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
  63                           "certs", G_DIR_SEPARATOR_S,
  64                           host, ".", port, ".cert", NULL);
  65 }
  66
  67 char * readable_fingerprint(unsigned char *src, int len)
  68 {
  69         int i=0;
  70         char * ret;
  71
  72         if (src == NULL)
  73                 return NULL;
  74         ret = g_strdup("");
  75         while (i < len) {
  76                 char *tmp2;
  77                 if(i>0)
  78                         tmp2 = g_strdup_printf("%s:%02X", ret, src[i]);
  79                 else
  80                         tmp2 = g_strdup_printf("%02X", src[i]);
  81                 g_free(ret);
  82                 ret = g_strdup(tmp2);
  83                 g_free(tmp2);
  84                 i++;
  85         }
  86         return ret;
  87 }
  88
  89 #if USE_GNUTLS
  90 static gnutls_x509_crt x509_crt_copy(gnutls_x509_crt src)
  91 {
  92     int ret;
  93     size_t size;
  94     gnutls_datum tmp;
  95     gnutls_x509_crt dest;
  96     size = 0;
  97
  98     if (gnutls_x509_crt_init(&dest) != 0) {
  99         g_warning("couldn't gnutls_x509_crt_init\n");
 100         return NULL;
 101     }
 102
 103     if (gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, NULL, &size)
 104         != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 105         g_warning("couldn't gnutls_x509_crt_export to get size\n");
 106         gnutls_x509_crt_deinit(dest);
 107         return NULL;
 108     }
 109
 110     tmp.data = malloc(size);
 111     memset(tmp.data, 0, size);
 112     ret = gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, tmp.data, &size);
 113     if (ret == 0) {
 114         tmp.size = size;
 115         ret = gnutls_x509_crt_import(dest, &tmp, GNUTLS_X509_FMT_DER);
 116         if (ret) {
 117                 g_warning("couldn't gnutls_x509_crt_import for real (%d %s)\n", ret, gnutls_strerror(ret));
 118                 gnutls_x509_crt_deinit(dest);
 119                 dest = NULL;
 120         }
 121     } else {
 122         g_warning("couldn't gnutls_x509_crt_export for real (%d %s)\n", ret, gnutls_strerror(ret));
 123         gnutls_x509_crt_deinit(dest);
 124         dest = NULL;
 125     }
 126
 127     free(tmp.data);
 128     return dest;
 129 }
 130 #endif
 131
 132 static SSLCertificate *ssl_certificate_new(gnutls_x509_crt x509_cert, const gchar *host, gushort port)
 133 {
 134         SSLCertificate *cert = g_new0(SSLCertificate, 1);
 135         size_t n;
 136         unsigned char md[128];
 137
 138         if (host == NULL || x509_cert == NULL) {
 139                 ssl_certificate_destroy(cert);
 140                 return NULL;
 141         }
 142         cert->x509_cert = x509_crt_copy(x509_cert);
 143         cert->status = (guint)-1;
 144         cert->host = g_strdup(host);
 145         cert->port = port;
 146
 147         /* fingerprint */
 148         n = 128;
 149         gnutls_x509_crt_get_fingerprint(cert->x509_cert, GNUTLS_DIG_MD5, md, &n);
 150         cert->fingerprint = readable_fingerprint(md, (int)n);
 151         return cert;
 152 }
 153
 154 #ifdef USE_GNUTLS
 155 static void gnutls_i2d_X509_fp(FILE *fp, gnutls_x509_crt x509_cert)
 156 {
 157         char output[10*1024];
 158         size_t cert_size = 10*1024;
 159         int r;
 160
 161         if ((r = gnutls_x509_crt_export(x509_cert, GNUTLS_X509_FMT_DER, output, &cert_size)) < 0) {
 162                 g_warning("couldn't export cert %s (%zd)\n", gnutls_strerror(r), cert_size);
 163                 return;
 164         }
 165         debug_print("writing %zd bytes\n",cert_size);
 166         if (fwrite(&output, 1, cert_size, fp) < cert_size) {
 167                 g_warning("failed to write cert\n");
 168         }
 169 }
 170
 171 size_t gnutls_i2d_X509(gnutls_x509_crt x509_cert, unsigned char **output)
 172 {
 173         size_t cert_size = 10*1024;
 174         int r;
 175
 176         if (output == NULL)
 177                 return 0;
 178
 179         *output = malloc(cert_size);
 180
 181         if ((r = gnutls_x509_crt_export(x509_cert, GNUTLS_X509_FMT_DER, *output, &cert_size)) < 0) {
 182                 g_warning("couldn't export cert %s (%zd)\n", gnutls_strerror(r), cert_size);
 183                 free(*output);
 184                 *output = NULL;
 185                 return 0;
 186         }
 187         return cert_size;
 188 }
 189
 190 size_t gnutls_i2d_PrivateKey(gnutls_x509_privkey pkey, unsigned char **output)
 191 {
 192         size_t key_size = 10*1024;
 193         int r;
 194
 195         if (output == NULL)
 196                 return 0;
 197
 198         *output = malloc(key_size);
 199
 200         if ((r = gnutls_x509_privkey_export(pkey, GNUTLS_X509_FMT_DER, *output, &key_size)) < 0) {
 201                 g_warning("couldn't export key %s (%zd)\n", gnutls_strerror(r), key_size);
 202                 free(*output);
 203                 *output = NULL;
 204                 return 0;
 205         }
 206         return key_size;
 207 }
 208
 209 static gnutls_x509_crt gnutls_d2i_X509_fp(FILE *fp, int format)
 210 {
 211         gnutls_x509_crt cert = NULL;
 212         gnutls_datum tmp;
 213         struct stat s;
 214         int r;
 215         if (fstat(fileno(fp), &s) < 0) {
 216                 perror("fstat");
 217                 return NULL;
 218         }
 219         tmp.data = malloc(s.st_size);
 220         memset(tmp.data, 0, s.st_size);
 221         tmp.size = s.st_size;
 222         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 223                 perror("fread");
 224                 free(tmp.data);
 225                 return NULL;
 226         }
 227
 228         gnutls_x509_crt_init(&cert);
 229         if ((r = gnutls_x509_crt_import(cert, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM)) < 0) {
 230                 debug_print("cert import failed: %s\n", gnutls_strerror(r));
 231                 gnutls_x509_crt_deinit(cert);
 232                 cert = NULL;
 233         }
 234         free(tmp.data);
 235         debug_print("got cert! %p\n", cert);
 236         return cert;
 237 }
 238
 239 static gnutls_x509_privkey gnutls_d2i_key_fp(FILE *fp, int format)
 240 {
 241         gnutls_x509_privkey key = NULL;
 242         gnutls_datum tmp;
 243         struct stat s;
 244         int r;
 245         if (fstat(fileno(fp), &s) < 0) {
 246                 perror("fstat");
 247                 return NULL;
 248         }
 249         tmp.data = malloc(s.st_size);
 250         memset(tmp.data, 0, s.st_size);
 251         tmp.size = s.st_size;
 252         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 253                 perror("fread");
 254                 free(tmp.data);
 255                 return NULL;
 256         }
 257
 258         gnutls_x509_privkey_init(&key);
 259         if ((r = gnutls_x509_privkey_import(key, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM)) < 0) {
 260                 debug_print("key import failed: %s\n", gnutls_strerror(r));
 261                 gnutls_x509_privkey_deinit(key);
 262                 key = NULL;
 263         }
 264         free(tmp.data);
 265         debug_print("got key! %p\n", key);
 266         return key;
 267 }
 268
 269 static gnutls_pkcs12_t gnutls_d2i_PKCS12_fp(FILE *fp, int format)
 270 {
 271         gnutls_pkcs12_t p12 = NULL;
 272         gnutls_datum tmp;
 273         struct stat s;
 274         int r;
 275         if (fstat(fileno(fp), &s) < 0) {
 276                 perror("fstat");
 277                 return NULL;
 278         }
 279         tmp.data = malloc(s.st_size);
 280         memset(tmp.data, 0, s.st_size);
 281         tmp.size = s.st_size;
 282         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 283                 perror("fread");
 284                 free(tmp.data);
 285                 return NULL;
 286         }
 287
 288         gnutls_pkcs12_init(&p12);
 289
 290         if ((r = gnutls_pkcs12_import(p12, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM,0)) < 0) {
 291                 g_warning("p12 import failed: %s\n", gnutls_strerror(r));
 292                 gnutls_pkcs12_deinit(p12);
 293                 p12 = NULL;
 294         }
 295         free(tmp.data);
 296         debug_print("got p12! %p\n", p12);
 297         return p12;
 298 }
 299
 300 #endif
 301
 302 static void ssl_certificate_save (SSLCertificate *cert)
 303 {
 304         gchar *file, *port;
 305         FILE *fp;
 306
 307         file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 308                           "certs", G_DIR_SEPARATOR_S, NULL);
 309
 310         if (!is_dir_exist(file))
 311                 make_dir_hier(file);
 312         g_free(file);
 313
 314         port = g_strdup_printf("%d", cert->port);
 315         file = get_certificate_path(cert->host, port, cert->fingerprint);
 316
 317         g_free(port);
 318         fp = g_fopen(file, "wb");
 319         if (fp == NULL) {
 320                 g_free(file);
 321                 debug_print("Can't save certificate !\n");
 322                 return;
 323         }
 324 #ifdef USE_GNUTLS
 325         gnutls_i2d_X509_fp(fp, cert->x509_cert);
 326 #else
 327         i2d_X509_fp(fp, cert->x509_cert);
 328 #endif
 329         g_free(file);
 330         fclose(fp);
 331
 332 }
 333
 334 void ssl_certificate_destroy(SSLCertificate *cert)
 335 {
 336         if (cert == NULL)
 337                 return;
 338
 339         if (cert->x509_cert)
 340                 gnutls_x509_crt_deinit(cert->x509_cert);
 341         g_free(cert->host);
 342         g_free(cert->fingerprint);
 343         g_free(cert);
 344         cert = NULL;
 345 }
 346
 347 void ssl_certificate_delete_from_disk(SSLCertificate *cert)
 348 {
 349         gchar *buf;
 350         gchar *file;
 351         buf = g_strdup_printf("%d", cert->port);
 352         file = get_certificate_path(cert->host, buf, cert->fingerprint);
 353         claws_unlink (file);
 354         g_free(file);
 355         g_free(buf);
 356 }
 357
 358 SSLCertificate *ssl_certificate_find (const gchar *host, gushort port, const gchar *fingerprint)
 359 {
 360         gchar *file = NULL;
 361         gchar *buf;
 362         SSLCertificate *cert = NULL;
 363         gnutls_x509_crt tmp_x509;
 364         FILE *fp = NULL;
 365         gboolean must_rename = FALSE;
 366
 367         buf = g_strdup_printf("%d", port);
 368
 369         if (fingerprint != NULL) {
 370                 file = get_certificate_path(host, buf, fingerprint);
 371                 fp = g_fopen(file, "rb");
 372         }
 373         if (fp == NULL) {
 374                 /* see if we have the old one */
 375                 debug_print("didn't get %s\n", file);
 376                 g_free(file);
 377                 file = get_certificate_path(host, buf, NULL);
 378                 fp = g_fopen(file, "rb");
 379
 380                 if (fp) {
 381                         debug_print("got %s\n", file);
 382                         must_rename = (fingerprint != NULL);
 383                 }
 384         } else {
 385                 debug_print("got %s first try\n", file);
 386         }
 387         if (fp == NULL) {
 388                 g_free(file);
 389                 g_free(buf);
 390                 return NULL;
 391         }
 392
 393         if ((tmp_x509 = gnutls_d2i_X509_fp(fp, 0)) != NULL) {
 394                 cert = ssl_certificate_new(tmp_x509, host, port);
 395                 debug_print("got cert %p\n", cert);
 396                 gnutls_x509_crt_deinit(tmp_x509);
 397         }
 398         fclose(fp);
 399         g_free(file);
 400
 401         if (must_rename) {
 402                 gchar *old = get_certificate_path(host, buf, NULL);
 403                 gchar *new = get_certificate_path(host, buf, fingerprint);
 404                 if (strcmp(old, new))
 405                         move_file(old, new, TRUE);
 406                 g_free(old);
 407                 g_free(new);
 408         }
 409         g_free(buf);
 410
 411         return cert;
 412 }
 413
 414 static gboolean ssl_certificate_compare (SSLCertificate *cert_a, SSLCertificate *cert_b)
 415 {
 416         char *output_a;
 417         char *output_b;
 418         size_t cert_size_a = 0, cert_size_b = 0;
 419         int r;
 420
 421         if (cert_a == NULL || cert_b == NULL)
 422                 return FALSE;
 423
 424         if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_a))
 425             != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 426                 g_warning("couldn't gnutls_x509_crt_export to get size a %s\n", gnutls_strerror(r));
 427                 return FALSE;
 428         }
 429
 430         if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_b))
 431             != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 432                 g_warning("couldn't gnutls_x509_crt_export to get size b %s\n", gnutls_strerror(r));
 433                 return FALSE;
 434         }
 435
 436         output_a = g_malloc(cert_size_a);
 437         output_b = g_malloc(cert_size_b);
 438         if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, output_a, &cert_size_a)) < 0) {
 439                 g_warning("couldn't gnutls_x509_crt_export a %s\n", gnutls_strerror(r));
 440                 g_free(output_a);
 441                 g_free(output_b);
 442                 return FALSE;
 443         }
 444         if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, output_b, &cert_size_b)) < 0) {
 445                 g_warning("couldn't gnutls_x509_crt_export b %s\n", gnutls_strerror(r));
 446                 g_free(output_a);
 447                 g_free(output_b);
 448                 return FALSE;
 449         }
 450         if (cert_size_a != cert_size_b) {
 451                 g_warning("size differ %zd %zd\n", cert_size_a, cert_size_b);
 452                 g_free(output_a);
 453                 g_free(output_b);
 454                 return FALSE;
 455         }
 456         if (memcmp(output_a, output_b, cert_size_a)) {
 457                 g_warning("contents differ\n");
 458                 g_free(output_a);
 459                 g_free(output_b);
 460                 return FALSE;
 461         }
 462         g_free(output_a);
 463         g_free(output_b);
 464
 465         return TRUE;
 466 }
 467
 468 static guint check_cert(gnutls_x509_crt cert)
 469 {
 470         gnutls_x509_crt *ca_list;
 471         unsigned int max = 512;
 472         unsigned int flags = 0;
 473         gnutls_datum tmp;
 474         struct stat s;
 475         int r, i;
 476         unsigned int status;
 477         FILE *fp;
 478
 479         if (claws_ssl_get_cert_file())
 480                 fp = g_fopen(claws_ssl_get_cert_file(), "r");
 481         else
 482                 return (guint)-1;
 483
 484         if (fstat(fileno(fp), &s) < 0) {
 485                 perror("fstat");
 486                 fclose(fp);
 487                 return (guint)-1;
 488         }
 489
 490         ca_list=(gnutls_x509_crt_t*)malloc(max*sizeof(gnutls_x509_crt_t));
 491         tmp.data = malloc(s.st_size);
 492         memset(tmp.data, 0, s.st_size);
 493         tmp.size = s.st_size;
 494         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 495                 perror("fread");
 496                 free(tmp.data);
 497                 free(ca_list);
 498                 fclose(fp);
 499                 return (guint)-1;
 500         }
 501
 502         if ((r = gnutls_x509_crt_list_import(ca_list, &max,
 503                         &tmp, GNUTLS_X509_FMT_PEM, flags)) < 0) {
 504                 debug_print("cert import failed: %s\n", gnutls_strerror(r));
 505                 free(tmp.data);
 506                 free(ca_list);
 507                 fclose(fp);
 508                 return (guint)-1;
 509         }
 510         free(tmp.data);
 511         debug_print("got %d certs in ca_list! %p\n", max, &ca_list);
 512         r = gnutls_x509_crt_verify(cert, ca_list, max, flags, &status);
 513         fclose(fp);
 514
 515         for (i = 0; i < max; i++)
 516                 gnutls_x509_crt_deinit(ca_list[i]);
 517         free(ca_list);
 518
 519         if (r < 0)
 520                 return (guint)-1;
 521         else
 522                 return status;
 523
 524 }
 525
 526 char *ssl_certificate_check_signer (gnutls_x509_crt cert, guint status)
 527 {
 528         if (status == (guint)-1) {
 529                 status = check_cert(cert);
 530                 if (status == -1)
 531                         return g_strdup(_("Uncheckable"));
 532         }
 533         if (status & GNUTLS_CERT_INVALID) {
 534                 if (gnutls_x509_crt_check_issuer(cert, cert))
 535                         return g_strdup(_("Self-signed certificate"));
 536         }
 537         if (status & GNUTLS_CERT_REVOKED)
 538                 return g_strdup(_("Revoked certificate"));
 539         if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 540                 return g_strdup(_("No certificate issuer found"));
 541         if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 542                 return g_strdup(_("Certificate issuer is not a CA"));
 543
 544
 545         return NULL;
 546 }
 547
 548 gboolean ssl_certificate_check (gnutls_x509_crt x509_cert, guint status, const gchar *host, gushort port)
 549 {
 550         SSLCertificate *current_cert = NULL;
 551         SSLCertificate *known_cert;
 552         SSLCertHookData cert_hook_data;
 553         gchar *fingerprint;
 554         size_t n;
 555         unsigned char md[128];
 556
 557         current_cert = ssl_certificate_new(x509_cert, host, port);
 558
 559         if (current_cert == NULL) {
 560                 debug_print("Buggy certificate !\n");
 561                 return FALSE;
 562         }
 563
 564         current_cert->status = status;
 565         /* fingerprint */
 566         n = 128;
 567         gnutls_x509_crt_get_fingerprint(x509_cert, GNUTLS_DIG_MD5, md, &n);
 568         fingerprint = readable_fingerprint(md, n);
 569
 570         known_cert = ssl_certificate_find(host, port, fingerprint);
 571
 572         g_free(fingerprint);
 573
 574         if (known_cert == NULL) {
 575                 cert_hook_data.cert = current_cert;
 576                 cert_hook_data.old_cert = NULL;
 577                 cert_hook_data.expired = FALSE;
 578                 cert_hook_data.accept = FALSE;
 579
 580                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 581
 582                 if (!cert_hook_data.accept) {
 583                         ssl_certificate_destroy(current_cert);
 584                         return FALSE;
 585                 } else {
 586                         ssl_certificate_save(current_cert);
 587                         ssl_certificate_destroy(current_cert);
 588                         return TRUE;
 589                 }
 590         } else if (!ssl_certificate_compare (current_cert, known_cert)) {
 591                 cert_hook_data.cert = current_cert;
 592                 cert_hook_data.old_cert = known_cert;
 593                 cert_hook_data.expired = FALSE;
 594                 cert_hook_data.accept = FALSE;
 595
 596                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 597
 598                 if (!cert_hook_data.accept) {
 599                         ssl_certificate_destroy(current_cert);
 600                         ssl_certificate_destroy(known_cert);
 601                         return FALSE;
 602                 } else {
 603                         ssl_certificate_save(current_cert);
 604                         ssl_certificate_destroy(current_cert);
 605                         ssl_certificate_destroy(known_cert);
 606                         return TRUE;
 607                 }
 608         } else if (gnutls_x509_crt_get_expiration_time(current_cert->x509_cert) < time(NULL)) {
 609                 gchar *tmp = g_strdup_printf("%s:%d", current_cert->host, current_cert->port);
 610
 611                 if (warned_expired == NULL)
 612                         warned_expired = g_hash_table_new(g_str_hash, g_str_equal);
 613
 614                 if (g_hash_table_lookup(warned_expired, tmp)) {
 615                         g_free(tmp);
 616                         ssl_certificate_destroy(current_cert);
 617                         ssl_certificate_destroy(known_cert);
 618                         return TRUE;
 619                 }
 620
 621                 cert_hook_data.cert = current_cert;
 622                 cert_hook_data.old_cert = NULL;
 623                 cert_hook_data.expired = TRUE;
 624                 cert_hook_data.accept = FALSE;
 625
 626                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 627
 628                 if (!cert_hook_data.accept) {
 629                         g_free(tmp);
 630                         ssl_certificate_destroy(current_cert);
 631                         ssl_certificate_destroy(known_cert);
 632                         return FALSE;
 633                 } else {
 634                         g_hash_table_insert(warned_expired, tmp, GINT_TO_POINTER(1));
 635                         ssl_certificate_destroy(current_cert);
 636                         ssl_certificate_destroy(known_cert);
 637                         return TRUE;
 638                 }
 639         }
 640
 641         ssl_certificate_destroy(current_cert);
 642         ssl_certificate_destroy(known_cert);
 643         return TRUE;
 644 }
 645
 646 gnutls_x509_crt ssl_certificate_get_x509_from_pem_file(const gchar *file)
 647 {
 648         gnutls_x509_crt x509 = NULL;
 649         if (!file)
 650                 return NULL;
 651
 652         if (is_file_exist(file)) {
 653                 FILE *fp = g_fopen(file, "r");
 654                 if (fp) {
 655                         x509 = gnutls_d2i_X509_fp(fp, 1);
 656                         fclose(fp);
 657                         return x509;
 658                 }
 659         } else {
 660                 log_error(LOG_PROTOCOL, _("Cannot open certificate file %s\n"), file);
 661         }
 662         return NULL;
 663 }
 664
 665 gnutls_x509_privkey ssl_certificate_get_pkey_from_pem_file(const gchar *file)
 666 {
 667         gnutls_x509_privkey key = NULL;
 668         if (!file)
 669                 return NULL;
 670
 671         if (is_file_exist(file)) {
 672                 FILE *fp = g_fopen(file, "r");
 673                 if (fp) {
 674                         key = gnutls_d2i_key_fp(fp, 1);
 675                         fclose(fp);
 676                         return key;
 677                 }
 678         } else {
 679                 log_error(LOG_PROTOCOL, _("Cannot open key file %s\n"), file);
 680         }
 681         return NULL;
 682 }
 683
 684 /* From GnuTLS lib/gnutls_x509.c */
 685 static int
 686 parse_pkcs12 (gnutls_pkcs12_t p12,
 687               const char *password,
 688               gnutls_x509_privkey * key,
 689               gnutls_x509_crt_t * cert)
 690 {
 691   gnutls_pkcs12_bag_t bag = NULL;
 692   int index = 0;
 693   int ret;
 694
 695   for (;;)
 696     {
 697       int elements_in_bag;
 698       int i;
 699
 700       ret = gnutls_pkcs12_bag_init (&bag);
 701       if (ret < 0)
 702         {
 703           bag = NULL;
 704           goto done;
 705         }
 706
 707       ret = gnutls_pkcs12_get_bag (p12, index, bag);
 708       if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
 709         break;
 710       if (ret < 0)
 711         {
 712           goto done;
 713         }
 714
 715       ret = gnutls_pkcs12_bag_get_type (bag, 0);
 716       if (ret < 0)
 717         {
 718           goto done;
 719         }
 720
 721       if (ret == GNUTLS_BAG_ENCRYPTED)
 722         {
 723           ret = gnutls_pkcs12_bag_decrypt (bag, password);
 724           if (ret < 0)
 725             {
 726               goto done;
 727             }
 728         }
 729
 730       elements_in_bag = gnutls_pkcs12_bag_get_count (bag);
 731       if (elements_in_bag < 0)
 732         {
 733           goto done;
 734         }
 735
 736       for (i = 0; i < elements_in_bag; i++)
 737         {
 738           int type;
 739           gnutls_datum data;
 740
 741           type = gnutls_pkcs12_bag_get_type (bag, i);
 742           if (type < 0)
 743             {
 744               goto done;
 745             }
 746
 747           ret = gnutls_pkcs12_bag_get_data (bag, i, &data);
 748           if (ret < 0)
 749             {
 750               goto done;
 751             }
 752
 753           switch (type)
 754             {
 755             case GNUTLS_BAG_PKCS8_ENCRYPTED_KEY:
 756             case GNUTLS_BAG_PKCS8_KEY:
 757               ret = gnutls_x509_privkey_init (key);
 758               if (ret < 0)
 759                 {
 760                   goto done;
 761                 }
 762
 763               ret = gnutls_x509_privkey_import_pkcs8
 764                 (*key, &data, GNUTLS_X509_FMT_DER, password,
 765                  type == GNUTLS_BAG_PKCS8_KEY ? GNUTLS_PKCS_PLAIN : 0);
 766               if (ret < 0)
 767                 {
 768                   goto done;
 769                 }
 770               break;
 771
 772             case GNUTLS_BAG_CERTIFICATE:
 773               ret = gnutls_x509_crt_init (cert);
 774               if (ret < 0)
 775                 {
 776                   goto done;
 777                 }
 778
 779               ret =
 780                 gnutls_x509_crt_import (*cert, &data, GNUTLS_X509_FMT_DER);
 781               if (ret < 0)
 782                 {
 783                   goto done;
 784                 }
 785               break;
 786
 787             case GNUTLS_BAG_ENCRYPTED:
 788               /* XXX Bother to recurse one level down?  Unlikely to
 789                  use the same password anyway. */
 790             case GNUTLS_BAG_EMPTY:
 791             default:
 792               break;
 793             }
 794         }
 795
 796       index++;
 797       gnutls_pkcs12_bag_deinit (bag);
 798     }
 799
 800   ret = 0;
 801
 802 done:
 803   if (bag)
 804     gnutls_pkcs12_bag_deinit (bag);
 805
 806   return ret;
 807 }
 808 void ssl_certificate_get_x509_and_pkey_from_p12_file(const gchar *file, const gchar *password,
 809                         gnutls_x509_crt *x509, gnutls_x509_privkey *pkey)
 810 {
 811         gnutls_pkcs12_t p12 = NULL;
 812
 813         int r;
 814
 815         *x509 = NULL;
 816         *pkey = NULL;
 817         if (!file)
 818                 return;
 819
 820         if (is_file_exist(file)) {
 821                 FILE *fp = g_fopen(file, "r");
 822                 if (fp) {
 823                         p12 = gnutls_d2i_PKCS12_fp(fp, 0);
 824                         fclose(fp);
 825                 }
 826         } else {
 827                 log_error(LOG_PROTOCOL, _("Cannot open certificate file %s\n"), file);
 828         }
 829         if (p12 != NULL) {
 830                 if ((r = parse_pkcs12(p12, password, pkey, x509)) == 0) {
 831                         debug_print("got p12\n");
 832                 } else {
 833                         log_error(LOG_PROTOCOL, "%s\n", gnutls_strerror(r));
 834                 }
 835                 gnutls_pkcs12_deinit(p12);
 836         }
 837 }
 838
 839 gboolean ssl_certificate_check_subject_cn(SSLCertificate *cert)
 840 {
 841         return gnutls_x509_crt_check_hostname(cert->x509_cert, cert->host) != 0;
 842 }
 843
 844 gchar *ssl_certificate_get_subject_cn(SSLCertificate *cert)
 845 {
 846         gchar subject_cn[BUFFSIZE];
 847         size_t n = BUFFSIZE;
 848
 849         if(gnutls_x509_crt_get_dn_by_oid(cert->x509_cert,
 850                 GNUTLS_OID_X520_COMMON_NAME, 0, 0, subject_cn, &n))
 851                 strncpy(subject_cn, _("<not in certificate>"), BUFFSIZE);
 852
 853         return g_strdup(subject_cn);
 854 }
 855
 856 #endif /* USE_GNUTLS */