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 #include <errno.h>
  38 #ifdef G_OS_WIN32
  39 #  include <winsock2.h>
  40 #else
  41 #  include <sys/socket.h>
  42 #  include <netinet/in.h>
  43 #  include <netdb.h>
  44 #endif /* G_OS_WIN32 */
  45 #include "ssl_certificate.h"
  46 #include "utils.h"
  47 #include "log.h"
  48 #include "socket.h"
  49 #include "hooks.h"
  50 #include "defs.h"
  51
  52 static GHashTable *warned_expired = NULL;
  53
  54 gboolean prefs_common_unsafe_ssl_certs(void);
  55
  56 static gchar *get_certificate_path(const gchar *host, const gchar *port, const gchar *fp)
  57 {
  58         if (fp != NULL && prefs_common_unsafe_ssl_certs())
  59                 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
  60                           "certs", G_DIR_SEPARATOR_S,
  61                           host, ".", port, ".", fp, ".cert", NULL);
  62         else
  63                 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
  64                           "certs", G_DIR_SEPARATOR_S,
  65                           host, ".", port, ".cert", NULL);
  66 }
  67
  68 char * readable_fingerprint(unsigned char *src, int len)
  69 {
  70         int i=0;
  71         char * ret;
  72
  73         if (src == NULL)
  74                 return NULL;
  75         ret = g_strdup("");
  76         while (i < len) {
  77                 char *tmp2;
  78                 if(i>0)
  79                         tmp2 = g_strdup_printf("%s:%02X", ret, src[i]);
  80                 else
  81                         tmp2 = g_strdup_printf("%02X", src[i]);
  82                 g_free(ret);
  83                 ret = g_strdup(tmp2);
  84                 g_free(tmp2);
  85                 i++;
  86         }
  87         return ret;
  88 }
  89
  90 #if USE_GNUTLS
  91 static gnutls_x509_crt_t x509_crt_copy(gnutls_x509_crt_t src)
  92 {
  93     int ret;
  94     size_t size;
  95     gnutls_datum_t tmp;
  96     gnutls_x509_crt_t dest;
  97     size = 0;
  98
  99     if (gnutls_x509_crt_init(&dest) != 0) {
 100         g_warning("couldn't gnutls_x509_crt_init\n");
 101         return NULL;
 102     }
 103
 104     if (gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, NULL, &size)
 105         != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 106         g_warning("couldn't gnutls_x509_crt_export to get size\n");
 107         gnutls_x509_crt_deinit(dest);
 108         return NULL;
 109     }
 110
 111     tmp.data = malloc(size);
 112     memset(tmp.data, 0, size);
 113     ret = gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, tmp.data, &size);
 114     if (ret == 0) {
 115         tmp.size = size;
 116         ret = gnutls_x509_crt_import(dest, &tmp, GNUTLS_X509_FMT_DER);
 117         if (ret) {
 118                 g_warning("couldn't gnutls_x509_crt_import for real (%d %s)\n", ret, gnutls_strerror(ret));
 119                 gnutls_x509_crt_deinit(dest);
 120                 dest = NULL;
 121         }
 122     } else {
 123         g_warning("couldn't gnutls_x509_crt_export for real (%d %s)\n", ret, gnutls_strerror(ret));
 124         gnutls_x509_crt_deinit(dest);
 125         dest = NULL;
 126     }
 127
 128     free(tmp.data);
 129     return dest;
 130 }
 131 #endif
 132
 133 static SSLCertificate *ssl_certificate_new(gnutls_x509_crt_t x509_cert, const gchar *host, gushort port)
 134 {
 135         SSLCertificate *cert = g_new0(SSLCertificate, 1);
 136         size_t n;
 137         unsigned char md[128];
 138
 139         if (host == NULL || x509_cert == NULL) {
 140                 ssl_certificate_destroy(cert);
 141                 return NULL;
 142         }
 143         cert->x509_cert = x509_crt_copy(x509_cert);
 144         cert->status = (guint)-1;
 145         cert->host = g_strdup(host);
 146         cert->port = port;
 147
 148         /* fingerprint */
 149         n = 128;
 150         gnutls_x509_crt_get_fingerprint(cert->x509_cert, GNUTLS_DIG_MD5, md, &n);
 151         cert->fingerprint = readable_fingerprint(md, (int)n);
 152         return cert;
 153 }
 154
 155 #ifdef USE_GNUTLS
 156 static void gnutls_export_X509_fp(FILE *fp, gnutls_x509_crt_t x509_cert, gnutls_x509_crt_fmt_t format)
 157 {
 158         char output[10*1024];
 159         size_t cert_size = 10*1024;
 160         int r;
 161
 162         if ((r = gnutls_x509_crt_export(x509_cert, format, output, &cert_size)) < 0) {
 163                 g_warning("couldn't export cert %s (%zd)\n", gnutls_strerror(r), cert_size);
 164                 return;
 165         }
 166         debug_print("writing %zd bytes\n",cert_size);
 167         if (fwrite(&output, 1, cert_size, fp) < cert_size) {
 168                 g_warning("failed to write cert\n");
 169         }
 170 }
 171
 172 size_t gnutls_i2d_X509(gnutls_x509_crt_t x509_cert, unsigned char **output)
 173 {
 174         size_t cert_size = 10*1024;
 175         int r;
 176
 177         if (output == NULL)
 178                 return 0;
 179
 180         *output = malloc(cert_size);
 181
 182         if ((r = gnutls_x509_crt_export(x509_cert, GNUTLS_X509_FMT_DER, *output, &cert_size)) < 0) {
 183                 g_warning("couldn't export cert %s (%zd)\n", gnutls_strerror(r), cert_size);
 184                 free(*output);
 185                 *output = NULL;
 186                 return 0;
 187         }
 188         return cert_size;
 189 }
 190
 191 size_t gnutls_i2d_PrivateKey(gnutls_x509_privkey_t pkey, unsigned char **output)
 192 {
 193         size_t key_size = 10*1024;
 194         int r;
 195
 196         if (output == NULL)
 197                 return 0;
 198
 199         *output = malloc(key_size);
 200
 201         if ((r = gnutls_x509_privkey_export(pkey, GNUTLS_X509_FMT_DER, *output, &key_size)) < 0) {
 202                 g_warning("couldn't export key %s (%zd)\n", gnutls_strerror(r), key_size);
 203                 free(*output);
 204                 *output = NULL;
 205                 return 0;
 206         }
 207         return key_size;
 208 }
 209
 210 static int gnutls_import_X509_list_fp(FILE *fp, gnutls_x509_crt_fmt_t format,
 211                                    gnutls_x509_crt_t **cert_list, gint *num_certs)
 212 {
 213         gnutls_x509_crt_t *crt_list;
 214         unsigned int max = 512;
 215         unsigned int flags = 0;
 216         gnutls_datum_t tmp;
 217         struct stat s;
 218         int r;
 219
 220         *cert_list = NULL;
 221         *num_certs = 0;
 222
 223         if (fp == NULL)
 224                 return -ENOENT;
 225
 226         if (fstat(fileno(fp), &s) < 0) {
 227                 perror("fstat");
 228                 return -errno;
 229         }
 230
 231         crt_list=(gnutls_x509_crt_t*)malloc(max*sizeof(gnutls_x509_crt_t));
 232         tmp.data = malloc(s.st_size);
 233         memset(tmp.data, 0, s.st_size);
 234         tmp.size = s.st_size;
 235         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 236                 perror("fread");
 237                 free(tmp.data);
 238                 free(crt_list);
 239                 return -EIO;
 240         }
 241
 242         if ((r = gnutls_x509_crt_list_import(crt_list, &max,
 243                         &tmp, format, flags)) < 0) {
 244                 debug_print("cert import failed: %s\n", gnutls_strerror(r));
 245                 free(tmp.data);
 246                 free(crt_list);
 247                 return r;
 248         }
 249         free(tmp.data);
 250         debug_print("got %d certs in crt_list! %p\n", max, &crt_list);
 251
 252         *cert_list = crt_list;
 253         *num_certs = max;
 254
 255         return r;
 256 }
 257
 258 /* return one certificate, read from file */
 259 static gnutls_x509_crt_t gnutls_import_X509_fp(FILE *fp, gnutls_x509_crt_fmt_t format)
 260 {
 261         gnutls_x509_crt_t *certs = NULL;
 262         gnutls_x509_crt_t cert = NULL;
 263         int i, ncerts, r;
 264
 265         if ((r = gnutls_import_X509_list_fp(fp, format, &certs, &ncerts)) < 0) {
 266                 return NULL;
 267         }
 268
 269         if (ncerts == 0)
 270                 return NULL;
 271
 272         for (i = 1; i < ncerts; i++)
 273                 gnutls_x509_crt_deinit(certs[i]);
 274
 275         cert = certs[0];
 276         free(certs);
 277
 278         return cert;
 279 }
 280
 281 static gnutls_x509_privkey_t gnutls_import_key_fp(FILE *fp, gnutls_x509_crt_fmt_t format)
 282 {
 283         gnutls_x509_privkey_t key = NULL;
 284         gnutls_datum_t tmp;
 285         struct stat s;
 286         int r;
 287         if (fstat(fileno(fp), &s) < 0) {
 288                 perror("fstat");
 289                 return NULL;
 290         }
 291         tmp.data = malloc(s.st_size);
 292         memset(tmp.data, 0, s.st_size);
 293         tmp.size = s.st_size;
 294         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 295                 perror("fread");
 296                 free(tmp.data);
 297                 return NULL;
 298         }
 299
 300         gnutls_x509_privkey_init(&key);
 301         if ((r = gnutls_x509_privkey_import(key, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM)) < 0) {
 302                 debug_print("key import failed: %s\n", gnutls_strerror(r));
 303                 gnutls_x509_privkey_deinit(key);
 304                 key = NULL;
 305         }
 306         free(tmp.data);
 307         debug_print("got key! %p\n", key);
 308         return key;
 309 }
 310
 311 static gnutls_pkcs12_t gnutls_import_PKCS12_fp(FILE *fp, gnutls_x509_crt_fmt_t format)
 312 {
 313         gnutls_pkcs12_t p12 = NULL;
 314         gnutls_datum_t tmp;
 315         struct stat s;
 316         int r;
 317         if (fstat(fileno(fp), &s) < 0) {
 318                 log_error(LOG_PROTOCOL, _("Cannot stat P12 certificate file (%s)\n"),
 319                                   strerror(errno));
 320                 return NULL;
 321         }
 322         tmp.data = malloc(s.st_size);
 323         memset(tmp.data, 0, s.st_size);
 324         tmp.size = s.st_size;
 325         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 326                 log_error(LOG_PROTOCOL, _("Cannot read P12 certificate file (%s)\n"),
 327                                   strerror(errno));
 328                 free(tmp.data);
 329                 return NULL;
 330         }
 331
 332         gnutls_pkcs12_init(&p12);
 333
 334         if ((r = gnutls_pkcs12_import(p12, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM,0)) < 0) {
 335                 log_error(LOG_PROTOCOL, _("Cannot import P12 certificate file (%s)\n"),
 336                                   gnutls_strerror(r));
 337                 gnutls_pkcs12_deinit(p12);
 338                 p12 = NULL;
 339         }
 340         free(tmp.data);
 341         debug_print("got p12! %p\n", p12);
 342         return p12;
 343 }
 344
 345 #endif
 346
 347 static void ssl_certificate_save (SSLCertificate *cert)
 348 {
 349         gchar *file, *port;
 350         FILE *fp;
 351
 352         file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 353                           "certs", G_DIR_SEPARATOR_S, NULL);
 354
 355         if (!is_dir_exist(file))
 356                 make_dir_hier(file);
 357         g_free(file);
 358
 359         port = g_strdup_printf("%d", cert->port);
 360         file = get_certificate_path(cert->host, port, cert->fingerprint);
 361
 362         g_free(port);
 363         fp = g_fopen(file, "wb");
 364         if (fp == NULL) {
 365                 g_free(file);
 366                 debug_print("Can't save certificate !\n");
 367                 return;
 368         }
 369
 370         gnutls_export_X509_fp(fp, cert->x509_cert, GNUTLS_X509_FMT_DER);
 371
 372         g_free(file);
 373         fclose(fp);
 374
 375 }
 376
 377 void ssl_certificate_destroy(SSLCertificate *cert)
 378 {
 379         if (cert == NULL)
 380                 return;
 381
 382         if (cert->x509_cert)
 383                 gnutls_x509_crt_deinit(cert->x509_cert);
 384         g_free(cert->host);
 385         g_free(cert->fingerprint);
 386         g_free(cert);
 387         cert = NULL;
 388 }
 389
 390 void ssl_certificate_delete_from_disk(SSLCertificate *cert)
 391 {
 392         gchar *buf;
 393         gchar *file;
 394         buf = g_strdup_printf("%d", cert->port);
 395         file = get_certificate_path(cert->host, buf, cert->fingerprint);
 396         claws_unlink (file);
 397         g_free(file);
 398         g_free(buf);
 399 }
 400
 401 SSLCertificate *ssl_certificate_find (const gchar *host, gushort port, const gchar *fingerprint)
 402 {
 403         gchar *file = NULL;
 404         gchar *buf;
 405         SSLCertificate *cert = NULL;
 406         gnutls_x509_crt_t tmp_x509;
 407         FILE *fp = NULL;
 408         gboolean must_rename = FALSE;
 409
 410         buf = g_strdup_printf("%d", port);
 411
 412         if (fingerprint != NULL) {
 413                 file = get_certificate_path(host, buf, fingerprint);
 414                 fp = g_fopen(file, "rb");
 415         }
 416         if (fp == NULL) {
 417                 /* see if we have the old one */
 418                 debug_print("didn't get %s\n", file);
 419                 g_free(file);
 420                 file = get_certificate_path(host, buf, NULL);
 421                 fp = g_fopen(file, "rb");
 422
 423                 if (fp) {
 424                         debug_print("got %s\n", file);
 425                         must_rename = (fingerprint != NULL);
 426                 }
 427         } else {
 428                 debug_print("got %s first try\n", file);
 429         }
 430         if (fp == NULL) {
 431                 g_free(file);
 432                 g_free(buf);
 433                 return NULL;
 434         }
 435
 436         if ((tmp_x509 = gnutls_import_X509_fp(fp, GNUTLS_X509_FMT_DER)) != NULL) {
 437                 cert = ssl_certificate_new(tmp_x509, host, port);
 438                 debug_print("got cert %p\n", cert);
 439                 gnutls_x509_crt_deinit(tmp_x509);
 440         }
 441         fclose(fp);
 442         g_free(file);
 443
 444         if (must_rename) {
 445                 gchar *old = get_certificate_path(host, buf, NULL);
 446                 gchar *new = get_certificate_path(host, buf, fingerprint);
 447                 if (strcmp(old, new))
 448                         move_file(old, new, TRUE);
 449                 g_free(old);
 450                 g_free(new);
 451         }
 452         g_free(buf);
 453
 454         return cert;
 455 }
 456
 457 static gboolean ssl_certificate_compare (SSLCertificate *cert_a, SSLCertificate *cert_b)
 458 {
 459         char *output_a;
 460         char *output_b;
 461         size_t cert_size_a = 0, cert_size_b = 0;
 462         int r;
 463
 464         if (cert_a == NULL || cert_b == NULL)
 465                 return FALSE;
 466
 467         if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_a))
 468             != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 469                 g_warning("couldn't gnutls_x509_crt_export to get size a %s\n", gnutls_strerror(r));
 470                 return FALSE;
 471         }
 472
 473         if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_b))
 474             != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 475                 g_warning("couldn't gnutls_x509_crt_export to get size b %s\n", gnutls_strerror(r));
 476                 return FALSE;
 477         }
 478
 479         output_a = g_malloc(cert_size_a);
 480         output_b = g_malloc(cert_size_b);
 481         if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, output_a, &cert_size_a)) < 0) {
 482                 g_warning("couldn't gnutls_x509_crt_export a %s\n", gnutls_strerror(r));
 483                 g_free(output_a);
 484                 g_free(output_b);
 485                 return FALSE;
 486         }
 487         if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, output_b, &cert_size_b)) < 0) {
 488                 g_warning("couldn't gnutls_x509_crt_export b %s\n", gnutls_strerror(r));
 489                 g_free(output_a);
 490                 g_free(output_b);
 491                 return FALSE;
 492         }
 493         if (cert_size_a != cert_size_b) {
 494                 g_warning("size differ %zd %zd\n", cert_size_a, cert_size_b);
 495                 g_free(output_a);
 496                 g_free(output_b);
 497                 return FALSE;
 498         }
 499         if (memcmp(output_a, output_b, cert_size_a)) {
 500                 g_warning("contents differ\n");
 501                 g_free(output_a);
 502                 g_free(output_b);
 503                 return FALSE;
 504         }
 505         g_free(output_a);
 506         g_free(output_b);
 507
 508         return TRUE;
 509 }
 510
 511 static guint check_cert(gnutls_x509_crt_t cert)
 512 {
 513         gnutls_x509_crt_t *ca_list;
 514         unsigned int max = 512;
 515         unsigned int flags = 0;
 516         int r, i;
 517         unsigned int status;
 518         FILE *fp;
 519
 520         if (claws_ssl_get_cert_file())
 521                 fp = g_fopen(claws_ssl_get_cert_file(), "r");
 522         else
 523                 return (guint)-1;
 524
 525         if ((r = gnutls_import_X509_list_fp(fp, GNUTLS_X509_FMT_PEM, &ca_list, &max)) < 0) {
 526                 debug_print("cert import failed: %s\n", gnutls_strerror(r));
 527                 fclose(fp);
 528                 return (guint)-1;
 529         }
 530
 531         r = gnutls_x509_crt_verify(cert, ca_list, max, flags, &status);
 532         fclose(fp);
 533
 534         for (i = 0; i < max; i++)
 535                 gnutls_x509_crt_deinit(ca_list[i]);
 536         free(ca_list);
 537
 538         if (r < 0)
 539                 return (guint)-1;
 540         else
 541                 return status;
 542
 543 }
 544
 545 char *ssl_certificate_check_signer (gnutls_x509_crt_t cert, guint status)
 546 {
 547         if (status == (guint)-1) {
 548                 status = check_cert(cert);
 549                 if (status == -1)
 550                         return g_strdup(_("Uncheckable"));
 551         }
 552         if (status & GNUTLS_CERT_INVALID) {
 553                 if (gnutls_x509_crt_check_issuer(cert, cert))
 554                         return g_strdup(_("Self-signed certificate"));
 555         }
 556         if (status & GNUTLS_CERT_REVOKED)
 557                 return g_strdup(_("Revoked certificate"));
 558         if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 559                 return g_strdup(_("No certificate issuer found"));
 560         if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 561                 return g_strdup(_("Certificate issuer is not a CA"));
 562
 563
 564         return NULL;
 565 }
 566
 567 gboolean ssl_certificate_check (gnutls_x509_crt_t x509_cert, guint status, const gchar *host, gushort port)
 568 {
 569         SSLCertificate *current_cert = NULL;
 570         SSLCertificate *known_cert;
 571         SSLCertHookData cert_hook_data;
 572         gchar *fingerprint;
 573         size_t n;
 574         unsigned char md[128];
 575
 576         current_cert = ssl_certificate_new(x509_cert, host, port);
 577
 578         if (current_cert == NULL) {
 579                 debug_print("Buggy certificate !\n");
 580                 return FALSE;
 581         }
 582
 583         current_cert->status = status;
 584         /* fingerprint */
 585         n = 128;
 586         gnutls_x509_crt_get_fingerprint(x509_cert, GNUTLS_DIG_MD5, md, &n);
 587         fingerprint = readable_fingerprint(md, n);
 588
 589         known_cert = ssl_certificate_find(host, port, fingerprint);
 590
 591         g_free(fingerprint);
 592
 593         if (known_cert == NULL) {
 594                 cert_hook_data.cert = current_cert;
 595                 cert_hook_data.old_cert = NULL;
 596                 cert_hook_data.expired = FALSE;
 597                 cert_hook_data.accept = FALSE;
 598
 599                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 600
 601                 if (!cert_hook_data.accept) {
 602                         ssl_certificate_destroy(current_cert);
 603                         return FALSE;
 604                 } else {
 605                         ssl_certificate_save(current_cert);
 606                         ssl_certificate_destroy(current_cert);
 607                         return TRUE;
 608                 }
 609         } else if (!ssl_certificate_compare (current_cert, known_cert)) {
 610                 cert_hook_data.cert = current_cert;
 611                 cert_hook_data.old_cert = known_cert;
 612                 cert_hook_data.expired = FALSE;
 613                 cert_hook_data.accept = FALSE;
 614
 615                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 616
 617                 if (!cert_hook_data.accept) {
 618                         ssl_certificate_destroy(current_cert);
 619                         ssl_certificate_destroy(known_cert);
 620                         return FALSE;
 621                 } else {
 622                         ssl_certificate_save(current_cert);
 623                         ssl_certificate_destroy(current_cert);
 624                         ssl_certificate_destroy(known_cert);
 625                         return TRUE;
 626                 }
 627         } else if (gnutls_x509_crt_get_expiration_time(current_cert->x509_cert) < time(NULL)) {
 628                 gchar *tmp = g_strdup_printf("%s:%d", current_cert->host, current_cert->port);
 629
 630                 if (warned_expired == NULL)
 631                         warned_expired = g_hash_table_new(g_str_hash, g_str_equal);
 632
 633                 if (g_hash_table_lookup(warned_expired, tmp)) {
 634                         g_free(tmp);
 635                         ssl_certificate_destroy(current_cert);
 636                         ssl_certificate_destroy(known_cert);
 637                         return TRUE;
 638                 }
 639
 640                 cert_hook_data.cert = current_cert;
 641                 cert_hook_data.old_cert = NULL;
 642                 cert_hook_data.expired = TRUE;
 643                 cert_hook_data.accept = FALSE;
 644
 645                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 646
 647                 if (!cert_hook_data.accept) {
 648                         g_free(tmp);
 649                         ssl_certificate_destroy(current_cert);
 650                         ssl_certificate_destroy(known_cert);
 651                         return FALSE;
 652                 } else {
 653                         g_hash_table_insert(warned_expired, tmp, GINT_TO_POINTER(1));
 654                         ssl_certificate_destroy(current_cert);
 655                         ssl_certificate_destroy(known_cert);
 656                         return TRUE;
 657                 }
 658         }
 659
 660         ssl_certificate_destroy(current_cert);
 661         ssl_certificate_destroy(known_cert);
 662         return TRUE;
 663 }
 664
 665 gboolean ssl_certificate_check_chain(gnutls_x509_crt_t *certs, gint chain_len, const gchar *host, gushort port)
 666 {
 667         int ncas = 0, ncrls = 0;
 668         gnutls_x509_crt_t *cas = NULL;
 669         gnutls_x509_crl_t *crls = NULL;
 670         gboolean result = FALSE;
 671         int i;
 672         gint status;
 673
 674         if (claws_ssl_get_cert_file()) {
 675                 FILE *fp = g_fopen(claws_ssl_get_cert_file(), "rb");
 676                 int r = -errno;
 677
 678                 if (fp) {
 679                         r = gnutls_import_X509_list_fp(fp, GNUTLS_X509_FMT_PEM, &cas, &ncas);
 680                         fclose(fp);
 681                 }
 682
 683                 if (r < 0)
 684                         g_warning("Can't read SSL_CERT_FILE %s: %s\n",
 685                                 claws_ssl_get_cert_file(),
 686                                 gnutls_strerror(r));
 687         } else {
 688                 debug_print("Can't find SSL ca-certificates file\n");
 689         }
 690
 691
 692         gnutls_x509_crt_list_verify (certs,
 693                              chain_len,
 694                              cas, ncas,
 695                              NULL, 0,
 696                              GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT,
 697                              &status);
 698
 699         result = ssl_certificate_check(certs[0], status, host, port);
 700
 701         for (i = 0; i < ncas; i++)
 702                 gnutls_x509_crt_deinit(cas[i]);
 703         free(cas);
 704
 705         return result;
 706 }
 707
 708 gnutls_x509_crt_t ssl_certificate_get_x509_from_pem_file(const gchar *file)
 709 {
 710         gnutls_x509_crt_t x509 = NULL;
 711         if (!file)
 712                 return NULL;
 713
 714         if (is_file_exist(file)) {
 715                 FILE *fp = g_fopen(file, "r");
 716                 if (fp) {
 717                         x509 = gnutls_import_X509_fp(fp, GNUTLS_X509_FMT_PEM);
 718                         fclose(fp);
 719                         return x509;
 720                 } else {
 721                         log_error(LOG_PROTOCOL, _("Cannot open certificate file %s: %s\n"),
 722                                   file, strerror(errno));
 723                 }
 724         } else {
 725                 log_error(LOG_PROTOCOL, _("Certificate file %s missing (%s)\n"),
 726                           file, strerror(errno));
 727         }
 728         return NULL;
 729 }
 730
 731 gnutls_x509_privkey_t ssl_certificate_get_pkey_from_pem_file(const gchar *file)
 732 {
 733         gnutls_x509_privkey_t key = NULL;
 734         if (!file)
 735                 return NULL;
 736
 737         if (is_file_exist(file)) {
 738                 FILE *fp = g_fopen(file, "r");
 739                 if (fp) {
 740                         key = gnutls_import_key_fp(fp, GNUTLS_X509_FMT_PEM);
 741                         fclose(fp);
 742                         return key;
 743                 } else {
 744                         log_error(LOG_PROTOCOL, _("Cannot open key file %s (%s)\n"),
 745                         file, strerror(errno));
 746                 }
 747         } else {
 748                 log_error(LOG_PROTOCOL, _("Key file %s missing (%s)\n"), file,
 749                           strerror(errno));
 750         }
 751         return NULL;
 752 }
 753
 754 /* From GnuTLS lib/gnutls_x509.c */
 755 static int
 756 parse_pkcs12 (gnutls_pkcs12_t p12,
 757               const char *password,
 758               gnutls_x509_privkey_t * key,
 759               gnutls_x509_crt_t * cert)
 760 {
 761   gnutls_pkcs12_bag_t bag = NULL;
 762   int index = 0;
 763   int ret;
 764
 765   for (;;)
 766     {
 767       int elements_in_bag;
 768       int i;
 769
 770       ret = gnutls_pkcs12_bag_init (&bag);
 771       if (ret < 0)
 772         {
 773           bag = NULL;
 774           goto done;
 775         }
 776
 777       ret = gnutls_pkcs12_get_bag (p12, index, bag);
 778       if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
 779         break;
 780       if (ret < 0)
 781         {
 782           goto done;
 783         }
 784
 785       ret = gnutls_pkcs12_bag_get_type (bag, 0);
 786       if (ret < 0)
 787         {
 788           goto done;
 789         }
 790
 791       if (ret == GNUTLS_BAG_ENCRYPTED)
 792         {
 793           ret = gnutls_pkcs12_bag_decrypt (bag, password);
 794           if (ret < 0)
 795             {
 796               goto done;
 797             }
 798         }
 799
 800       elements_in_bag = gnutls_pkcs12_bag_get_count (bag);
 801       if (elements_in_bag < 0)
 802         {
 803           goto done;
 804         }
 805
 806       for (i = 0; i < elements_in_bag; i++)
 807         {
 808           int type;
 809           gnutls_datum_t data;
 810
 811           type = gnutls_pkcs12_bag_get_type (bag, i);
 812           if (type < 0)
 813             {
 814               goto done;
 815             }
 816
 817           ret = gnutls_pkcs12_bag_get_data (bag, i, &data);
 818           if (ret < 0)
 819             {
 820               goto done;
 821             }
 822
 823           switch (type)
 824             {
 825             case GNUTLS_BAG_PKCS8_ENCRYPTED_KEY:
 826             case GNUTLS_BAG_PKCS8_KEY:
 827               ret = gnutls_x509_privkey_init (key);
 828               if (ret < 0)
 829                 {
 830                   goto done;
 831                 }
 832
 833               ret = gnutls_x509_privkey_import_pkcs8
 834                 (*key, &data, GNUTLS_X509_FMT_DER, password,
 835                  type == GNUTLS_BAG_PKCS8_KEY ? GNUTLS_PKCS_PLAIN : 0);
 836               if (ret < 0)
 837                 {
 838                   goto done;
 839                 }
 840               break;
 841
 842             case GNUTLS_BAG_CERTIFICATE:
 843               ret = gnutls_x509_crt_init (cert);
 844               if (ret < 0)
 845                 {
 846                   goto done;
 847                 }
 848
 849               ret =
 850                 gnutls_x509_crt_import (*cert, &data, GNUTLS_X509_FMT_DER);
 851               if (ret < 0)
 852                 {
 853                   goto done;
 854                 }
 855               break;
 856
 857             case GNUTLS_BAG_ENCRYPTED:
 858               /* XXX Bother to recurse one level down?  Unlikely to
 859                  use the same password anyway. */
 860             case GNUTLS_BAG_EMPTY:
 861             default:
 862               break;
 863             }
 864         }
 865
 866       index++;
 867       gnutls_pkcs12_bag_deinit (bag);
 868     }
 869
 870   ret = 0;
 871
 872 done:
 873   if (bag)
 874     gnutls_pkcs12_bag_deinit (bag);
 875
 876   return ret;
 877 }
 878 void ssl_certificate_get_x509_and_pkey_from_p12_file(const gchar *file, const gchar *password,
 879                         gnutls_x509_crt_t *x509, gnutls_x509_privkey_t *pkey)
 880 {
 881         gnutls_pkcs12_t p12 = NULL;
 882
 883         int r;
 884
 885         *x509 = NULL;
 886         *pkey = NULL;
 887         if (!file)
 888                 return;
 889
 890         if (is_file_exist(file)) {
 891                 FILE *fp = g_fopen(file, "r");
 892                 if (fp) {
 893                         p12 = gnutls_import_PKCS12_fp(fp, GNUTLS_X509_FMT_DER);
 894                         fclose(fp);
 895                         if (!p12) {
 896                                 log_error(LOG_PROTOCOL, _("Failed to read P12 certificate file %s\n"), file);
 897                         }
 898                 } else {
 899                         log_error(LOG_PROTOCOL, _("Cannot open P12 certificate file %s (%s)\n"),
 900                                   file, strerror(errno));
 901                 }
 902         } else {
 903                 log_error(LOG_PROTOCOL, _("P12 Certificate file %s missing (%s)\n"), file,
 904                           strerror(errno));
 905         }
 906         if (p12 != NULL) {
 907                 if ((r = parse_pkcs12(p12, password, pkey, x509)) == 0) {
 908                         debug_print("got p12\n");
 909                 } else {
 910                         log_error(LOG_PROTOCOL, "%s\n", gnutls_strerror(r));
 911                 }
 912                 gnutls_pkcs12_deinit(p12);
 913         }
 914 }
 915
 916 gboolean ssl_certificate_check_subject_cn(SSLCertificate *cert)
 917 {
 918         return gnutls_x509_crt_check_hostname(cert->x509_cert, cert->host) != 0;
 919 }
 920
 921 gchar *ssl_certificate_get_subject_cn(SSLCertificate *cert)
 922 {
 923         gchar subject_cn[BUFFSIZE];
 924         size_t n = BUFFSIZE;
 925
 926         if(gnutls_x509_crt_get_dn_by_oid(cert->x509_cert,
 927                 GNUTLS_OID_X520_COMMON_NAME, 0, 0, subject_cn, &n))
 928                 strncpy(subject_cn, _("<not in certificate>"), BUFFSIZE);
 929
 930         return g_strdup(subject_cn);
 931 }
 932
 933 #endif /* USE_GNUTLS */