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 static void gnutls_export_X509_fp(FILE *fp, gnutls_x509_crt_t x509_cert, gnutls_x509_crt_fmt_t format)
 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, format, output, &cert_size)) < 0) {
 162                 g_warning("couldn't export cert %s (%zd)\n", gnutls_strerror(r), cert_size);
 163                 return;
 164         }
 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: %d %s\n", errno, strerror(errno));
 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) {
 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)) < 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 static void ssl_certificate_save (SSLCertificate *cert)
 346 {
 347         gchar *file, *port;
 348         FILE *fp;
 349
 350         file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 351                           "certs", G_DIR_SEPARATOR_S, NULL);
 352
 353         if (!is_dir_exist(file))
 354                 make_dir_hier(file);
 355         g_free(file);
 356
 357         port = g_strdup_printf("%d", cert->port);
 358         file = get_certificate_path(cert->host, port, cert->fingerprint);
 359
 360         g_free(port);
 361         fp = g_fopen(file, "wb");
 362         if (fp == NULL) {
 363                 g_free(file);
 364                 debug_print("Can't save certificate !\n");
 365                 return;
 366         }
 367
 368         gnutls_export_X509_fp(fp, cert->x509_cert, GNUTLS_X509_FMT_DER);
 369
 370         g_free(file);
 371         fclose(fp);
 372
 373 }
 374
 375 void ssl_certificate_destroy(SSLCertificate *cert)
 376 {
 377         if (cert == NULL)
 378                 return;
 379
 380         if (cert->x509_cert)
 381                 gnutls_x509_crt_deinit(cert->x509_cert);
 382         g_free(cert->host);
 383         g_free(cert->fingerprint);
 384         g_free(cert);
 385         cert = NULL;
 386 }
 387
 388 void ssl_certificate_delete_from_disk(SSLCertificate *cert)
 389 {
 390         gchar *buf;
 391         gchar *file;
 392         buf = g_strdup_printf("%d", cert->port);
 393         file = get_certificate_path(cert->host, buf, cert->fingerprint);
 394         claws_unlink (file);
 395         g_free(file);
 396         g_free(buf);
 397 }
 398
 399 SSLCertificate *ssl_certificate_find (const gchar *host, gushort port, const gchar *fingerprint)
 400 {
 401         gchar *file = NULL;
 402         gchar *buf;
 403         SSLCertificate *cert = NULL;
 404         gnutls_x509_crt_t tmp_x509;
 405         FILE *fp = NULL;
 406         gboolean must_rename = FALSE;
 407
 408         buf = g_strdup_printf("%d", port);
 409
 410         if (fingerprint != NULL) {
 411                 file = get_certificate_path(host, buf, fingerprint);
 412                 fp = g_fopen(file, "rb");
 413         }
 414         if (fp == NULL) {
 415                 /* see if we have the old one */
 416                 debug_print("didn't get %s\n", file);
 417                 g_free(file);
 418                 file = get_certificate_path(host, buf, NULL);
 419                 fp = g_fopen(file, "rb");
 420
 421                 if (fp) {
 422                         debug_print("got %s\n", file);
 423                         must_rename = (fingerprint != NULL);
 424                 }
 425         } else {
 426                 debug_print("got %s first try\n", file);
 427         }
 428         if (fp == NULL) {
 429                 g_free(file);
 430                 g_free(buf);
 431                 return NULL;
 432         }
 433
 434         if ((tmp_x509 = gnutls_import_X509_fp(fp, GNUTLS_X509_FMT_DER)) != NULL) {
 435                 cert = ssl_certificate_new(tmp_x509, host, port);
 436                 debug_print("got cert %p\n", cert);
 437                 gnutls_x509_crt_deinit(tmp_x509);
 438         }
 439
 440         fclose(fp);
 441         g_free(file);
 442
 443         if (must_rename) {
 444                 gchar *old = get_certificate_path(host, buf, NULL);
 445                 gchar *new = get_certificate_path(host, buf, fingerprint);
 446                 if (strcmp(old, new))
 447                         move_file(old, new, TRUE);
 448                 g_free(old);
 449                 g_free(new);
 450         }
 451         g_free(buf);
 452
 453         return cert;
 454 }
 455
 456 static gboolean ssl_certificate_compare (SSLCertificate *cert_a, SSLCertificate *cert_b)
 457 {
 458         char *output_a;
 459         char *output_b;
 460         size_t cert_size_a = 0, cert_size_b = 0;
 461         int r;
 462
 463         if (cert_a == NULL || cert_b == NULL)
 464                 return FALSE;
 465
 466         if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_a))
 467             != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 468                 g_warning("couldn't gnutls_x509_crt_export to get size a %s\n", gnutls_strerror(r));
 469                 return FALSE;
 470         }
 471
 472         if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_b))
 473             != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 474                 g_warning("couldn't gnutls_x509_crt_export to get size b %s\n", gnutls_strerror(r));
 475                 return FALSE;
 476         }
 477
 478         output_a = g_malloc(cert_size_a);
 479         output_b = g_malloc(cert_size_b);
 480         if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, output_a, &cert_size_a)) < 0) {
 481                 g_warning("couldn't gnutls_x509_crt_export a %s\n", gnutls_strerror(r));
 482                 g_free(output_a);
 483                 g_free(output_b);
 484                 return FALSE;
 485         }
 486         if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, output_b, &cert_size_b)) < 0) {
 487                 g_warning("couldn't gnutls_x509_crt_export b %s\n", gnutls_strerror(r));
 488                 g_free(output_a);
 489                 g_free(output_b);
 490                 return FALSE;
 491         }
 492         if (cert_size_a != cert_size_b) {
 493                 g_warning("size differ %zd %zd\n", cert_size_a, cert_size_b);
 494                 g_free(output_a);
 495                 g_free(output_b);
 496                 return FALSE;
 497         }
 498         if (memcmp(output_a, output_b, cert_size_a)) {
 499                 g_warning("contents differ\n");
 500                 g_free(output_a);
 501                 g_free(output_b);
 502                 return FALSE;
 503         }
 504         g_free(output_a);
 505         g_free(output_b);
 506
 507         return TRUE;
 508 }
 509
 510 static guint check_cert(gnutls_x509_crt_t cert)
 511 {
 512         gnutls_x509_crt_t *ca_list;
 513         unsigned int max = 512;
 514         unsigned int flags = 0;
 515         int r, i;
 516         unsigned int status;
 517         FILE *fp;
 518
 519         if (claws_ssl_get_cert_file())
 520                 fp = g_fopen(claws_ssl_get_cert_file(), "r");
 521         else
 522                 return (guint)-1;
 523
 524         if ((r = gnutls_import_X509_list_fp(fp, GNUTLS_X509_FMT_PEM, &ca_list, &max)) < 0) {
 525                 debug_print("cert import failed: %s\n", gnutls_strerror(r));
 526                 fclose(fp);
 527                 return (guint)-1;
 528         }
 529
 530         r = gnutls_x509_crt_verify(cert, ca_list, max, flags, &status);
 531         fclose(fp);
 532
 533         for (i = 0; i < max; i++)
 534                 gnutls_x509_crt_deinit(ca_list[i]);
 535         free(ca_list);
 536
 537         if (r < 0)
 538                 return (guint)-1;
 539         else
 540                 return status;
 541
 542 }
 543
 544 char *ssl_certificate_check_signer (gnutls_x509_crt_t cert, guint status)
 545 {
 546         if (status == (guint)-1) {
 547                 status = check_cert(cert);
 548                 if (status == -1)
 549                         return g_strdup(_("Uncheckable"));
 550         }
 551         if (status & GNUTLS_CERT_INVALID) {
 552                 if (gnutls_x509_crt_check_issuer(cert, cert))
 553                         return g_strdup(_("Self-signed certificate"));
 554         }
 555         if (status & GNUTLS_CERT_REVOKED)
 556                 return g_strdup(_("Revoked certificate"));
 557         if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 558                 return g_strdup(_("No certificate issuer found"));
 559         if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 560                 return g_strdup(_("Certificate issuer is not a CA"));
 561
 562
 563         return NULL;
 564 }
 565
 566 gboolean ssl_certificate_check (gnutls_x509_crt_t x509_cert, guint status, const gchar *host, gushort port)
 567 {
 568         SSLCertificate *current_cert = NULL;
 569         SSLCertificate *known_cert;
 570         SSLCertHookData cert_hook_data;
 571         gchar *fingerprint;
 572         size_t n;
 573         unsigned char md[128];
 574
 575         current_cert = ssl_certificate_new(x509_cert, host, port);
 576
 577         if (current_cert == NULL) {
 578                 debug_print("Buggy certificate !\n");
 579                 return FALSE;
 580         }
 581
 582         current_cert->status = status;
 583         /* fingerprint */
 584         n = 128;
 585         gnutls_x509_crt_get_fingerprint(x509_cert, GNUTLS_DIG_MD5, md, &n);
 586         fingerprint = readable_fingerprint(md, n);
 587
 588         known_cert = ssl_certificate_find(host, port, fingerprint);
 589
 590         g_free(fingerprint);
 591
 592         if (known_cert == NULL) {
 593                 cert_hook_data.cert = current_cert;
 594                 cert_hook_data.old_cert = NULL;
 595                 cert_hook_data.expired = FALSE;
 596                 cert_hook_data.accept = FALSE;
 597
 598                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 599
 600                 if (!cert_hook_data.accept) {
 601                         ssl_certificate_destroy(current_cert);
 602                         return FALSE;
 603                 } else {
 604                         ssl_certificate_save(current_cert);
 605                         ssl_certificate_destroy(current_cert);
 606                         return TRUE;
 607                 }
 608         } else if (!ssl_certificate_compare (current_cert, known_cert)) {
 609                 cert_hook_data.cert = current_cert;
 610                 cert_hook_data.old_cert = known_cert;
 611                 cert_hook_data.expired = FALSE;
 612                 cert_hook_data.accept = FALSE;
 613
 614                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 615
 616                 if (!cert_hook_data.accept) {
 617                         ssl_certificate_destroy(current_cert);
 618                         ssl_certificate_destroy(known_cert);
 619                         return FALSE;
 620                 } else {
 621                         ssl_certificate_save(current_cert);
 622                         ssl_certificate_destroy(current_cert);
 623                         ssl_certificate_destroy(known_cert);
 624                         return TRUE;
 625                 }
 626         } else if (gnutls_x509_crt_get_expiration_time(current_cert->x509_cert) < time(NULL)) {
 627                 gchar *tmp = g_strdup_printf("%s:%d", current_cert->host, current_cert->port);
 628
 629                 if (warned_expired == NULL)
 630                         warned_expired = g_hash_table_new(g_str_hash, g_str_equal);
 631
 632                 if (g_hash_table_lookup(warned_expired, tmp)) {
 633                         g_free(tmp);
 634                         ssl_certificate_destroy(current_cert);
 635                         ssl_certificate_destroy(known_cert);
 636                         return TRUE;
 637                 }
 638
 639                 cert_hook_data.cert = current_cert;
 640                 cert_hook_data.old_cert = NULL;
 641                 cert_hook_data.expired = TRUE;
 642                 cert_hook_data.accept = FALSE;
 643
 644                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 645
 646                 if (!cert_hook_data.accept) {
 647                         g_free(tmp);
 648                         ssl_certificate_destroy(current_cert);
 649                         ssl_certificate_destroy(known_cert);
 650                         return FALSE;
 651                 } else {
 652                         g_hash_table_insert(warned_expired, tmp, GINT_TO_POINTER(1));
 653                         ssl_certificate_destroy(current_cert);
 654                         ssl_certificate_destroy(known_cert);
 655                         return TRUE;
 656                 }
 657         }
 658
 659         ssl_certificate_destroy(current_cert);
 660         ssl_certificate_destroy(known_cert);
 661         return TRUE;
 662 }
 663
 664 gboolean ssl_certificate_check_chain(gnutls_x509_crt_t *certs, gint chain_len, const gchar *host, gushort port)
 665 {
 666         int ncas = 0, ncrls = 0;
 667         gnutls_x509_crt_t *cas = NULL;
 668         gnutls_x509_crl_t *crls = NULL;
 669         gboolean result = FALSE;
 670         int i;
 671         gint status;
 672
 673         if (claws_ssl_get_cert_file()) {
 674                 FILE *fp = g_fopen(claws_ssl_get_cert_file(), "rb");
 675                 int r = -errno;
 676
 677                 if (fp) {
 678                         r = gnutls_import_X509_list_fp(fp, GNUTLS_X509_FMT_PEM, &cas, &ncas);
 679                         fclose(fp);
 680                 }
 681
 682                 if (r < 0)
 683                         g_warning("Can't read SSL_CERT_FILE %s: %s\n",
 684                                 claws_ssl_get_cert_file(),
 685                                 gnutls_strerror(r));
 686         } else {
 687                 debug_print("Can't find SSL ca-certificates file\n");
 688         }
 689
 690
 691         gnutls_x509_crt_list_verify (certs,
 692                              chain_len,
 693                              cas, ncas,
 694                              NULL, 0,
 695                              GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT,
 696                              &status);
 697
 698         result = ssl_certificate_check(certs[0], status, host, port);
 699
 700         for (i = 0; i < ncas; i++)
 701                 gnutls_x509_crt_deinit(cas[i]);
 702         free(cas);
 703
 704         return result;
 705 }
 706
 707 gnutls_x509_crt_t ssl_certificate_get_x509_from_pem_file(const gchar *file)
 708 {
 709         gnutls_x509_crt_t x509 = NULL;
 710         if (!file)
 711                 return NULL;
 712
 713         if (is_file_exist(file)) {
 714                 FILE *fp = g_fopen(file, "r");
 715                 if (fp) {
 716                         x509 = gnutls_import_X509_fp(fp, GNUTLS_X509_FMT_PEM);
 717                         fclose(fp);
 718                         return x509;
 719                 } else {
 720                         log_error(LOG_PROTOCOL, _("Cannot open certificate file %s: %s\n"),
 721                                   file, strerror(errno));
 722                 }
 723         } else {
 724                 log_error(LOG_PROTOCOL, _("Certificate file %s missing (%s)\n"),
 725                           file, strerror(errno));
 726         }
 727         return NULL;
 728 }
 729
 730 gnutls_x509_privkey_t ssl_certificate_get_pkey_from_pem_file(const gchar *file)
 731 {
 732         gnutls_x509_privkey_t key = NULL;
 733         if (!file)
 734                 return NULL;
 735
 736         if (is_file_exist(file)) {
 737                 FILE *fp = g_fopen(file, "r");
 738                 if (fp) {
 739                         key = gnutls_import_key_fp(fp, GNUTLS_X509_FMT_PEM);
 740                         fclose(fp);
 741                         return key;
 742                 } else {
 743                         log_error(LOG_PROTOCOL, _("Cannot open key file %s (%s)\n"),
 744                         file, strerror(errno));
 745                 }
 746         } else {
 747                 log_error(LOG_PROTOCOL, _("Key file %s missing (%s)\n"), file,
 748                           strerror(errno));
 749         }
 750         return NULL;
 751 }
 752
 753 /* From GnuTLS lib/gnutls_x509.c */
 754 static int
 755 parse_pkcs12 (gnutls_pkcs12_t p12,
 756               const char *password,
 757               gnutls_x509_privkey_t * key,
 758               gnutls_x509_crt_t * cert)
 759 {
 760   gnutls_pkcs12_bag_t bag = NULL;
 761   int index = 0;
 762   int ret;
 763
 764   for (;;)
 765     {
 766       int elements_in_bag;
 767       int i;
 768
 769       ret = gnutls_pkcs12_bag_init (&bag);
 770       if (ret < 0)
 771         {
 772           bag = NULL;
 773           goto done;
 774         }
 775
 776       ret = gnutls_pkcs12_get_bag (p12, index, bag);
 777       if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
 778         break;
 779       if (ret < 0)
 780         {
 781           goto done;
 782         }
 783
 784       ret = gnutls_pkcs12_bag_get_type (bag, 0);
 785       if (ret < 0)
 786         {
 787           goto done;
 788         }
 789
 790       if (ret == GNUTLS_BAG_ENCRYPTED)
 791         {
 792           ret = gnutls_pkcs12_bag_decrypt (bag, password);
 793           if (ret < 0)
 794             {
 795               goto done;
 796             }
 797         }
 798
 799       elements_in_bag = gnutls_pkcs12_bag_get_count (bag);
 800       if (elements_in_bag < 0)
 801         {
 802           goto done;
 803         }
 804
 805       for (i = 0; i < elements_in_bag; i++)
 806         {
 807           int type;
 808           gnutls_datum_t data;
 809
 810           type = gnutls_pkcs12_bag_get_type (bag, i);
 811           if (type < 0)
 812             {
 813               goto done;
 814             }
 815
 816           ret = gnutls_pkcs12_bag_get_data (bag, i, &data);
 817           if (ret < 0)
 818             {
 819               goto done;
 820             }
 821
 822           switch (type)
 823             {
 824             case GNUTLS_BAG_PKCS8_ENCRYPTED_KEY:
 825             case GNUTLS_BAG_PKCS8_KEY:
 826               ret = gnutls_x509_privkey_init (key);
 827               if (ret < 0)
 828                 {
 829                   goto done;
 830                 }
 831
 832               ret = gnutls_x509_privkey_import_pkcs8
 833                 (*key, &data, GNUTLS_X509_FMT_DER, password,
 834                  type == GNUTLS_BAG_PKCS8_KEY ? GNUTLS_PKCS_PLAIN : 0);
 835               if (ret < 0)
 836                 {
 837                   goto done;
 838                 }
 839               break;
 840
 841             case GNUTLS_BAG_CERTIFICATE:
 842               ret = gnutls_x509_crt_init (cert);
 843               if (ret < 0)
 844                 {
 845                   goto done;
 846                 }
 847
 848               ret =
 849                 gnutls_x509_crt_import (*cert, &data, GNUTLS_X509_FMT_DER);
 850               if (ret < 0)
 851                 {
 852                   goto done;
 853                 }
 854               break;
 855
 856             case GNUTLS_BAG_ENCRYPTED:
 857               /* XXX Bother to recurse one level down?  Unlikely to
 858                  use the same password anyway. */
 859             case GNUTLS_BAG_EMPTY:
 860             default:
 861               break;
 862             }
 863         }
 864
 865       index++;
 866       gnutls_pkcs12_bag_deinit (bag);
 867     }
 868
 869   ret = 0;
 870
 871 done:
 872   if (bag)
 873     gnutls_pkcs12_bag_deinit (bag);
 874
 875   return ret;
 876 }
 877 void ssl_certificate_get_x509_and_pkey_from_p12_file(const gchar *file, const gchar *password,
 878                         gnutls_x509_crt_t *x509, gnutls_x509_privkey_t *pkey)
 879 {
 880         gnutls_pkcs12_t p12 = NULL;
 881
 882         int r;
 883
 884         *x509 = NULL;
 885         *pkey = NULL;
 886         if (!file)
 887                 return;
 888
 889         if (is_file_exist(file)) {
 890                 FILE *fp = g_fopen(file, "r");
 891                 if (fp) {
 892                         p12 = gnutls_import_PKCS12_fp(fp, GNUTLS_X509_FMT_DER);
 893                         fclose(fp);
 894                         if (!p12) {
 895                                 log_error(LOG_PROTOCOL, _("Failed to read P12 certificate file %s\n"), file);
 896                         }
 897                 } else {
 898                         log_error(LOG_PROTOCOL, _("Cannot open P12 certificate file %s (%s)\n"),
 899                                   file, strerror(errno));
 900                 }
 901         } else {
 902                 log_error(LOG_PROTOCOL, _("P12 Certificate file %s missing (%s)\n"), file,
 903                           strerror(errno));
 904         }
 905         if (p12 != NULL) {
 906                 if ((r = parse_pkcs12(p12, password, pkey, x509)) == 0) {
 907                         debug_print("got p12\n");
 908                 } else {
 909                         log_error(LOG_PROTOCOL, "%s\n", gnutls_strerror(r));
 910                 }
 911                 gnutls_pkcs12_deinit(p12);
 912         }
 913 }
 914
 915 gboolean ssl_certificate_check_subject_cn(SSLCertificate *cert)
 916 {
 917         return gnutls_x509_crt_check_hostname(cert->x509_cert, cert->host) != 0;
 918 }
 919
 920 gchar *ssl_certificate_get_subject_cn(SSLCertificate *cert)
 921 {
 922         gchar subject_cn[BUFFSIZE];
 923         size_t n = BUFFSIZE;
 924
 925         if(gnutls_x509_crt_get_dn_by_oid(cert->x509_cert,
 926                 GNUTLS_OID_X520_COMMON_NAME, 0, 0, subject_cn, &n))
 927                 strncpy(subject_cn, _("<not in certificate>"), BUFFSIZE);
 928
 929         return g_strdup(subject_cn);
 930 }
 931
 932 #endif /* USE_GNUTLS */