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