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_i2d_X509_fp(FILE *fp, gnutls_x509_crt_t x509_cert)
 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, GNUTLS_X509_FMT_DER, 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_d2i_X509_list_fp(FILE *fp, int format, gnutls_x509_crt_t **cert_list, gint *num_certs)
 211 {
 212         gnutls_x509_crt_t *crt_list;
 213         unsigned int max = 512;
 214         unsigned int flags = 0;
 215         gnutls_datum_t tmp;
 216         struct stat s;
 217         int r;
 218
 219         *cert_list = NULL;
 220         *num_certs = 0;
 221
 222         if (fp == NULL)
 223                 return -ENOENT;
 224
 225         if (fstat(fileno(fp), &s) < 0) {
 226                 perror("fstat");
 227                 return -errno;
 228         }
 229
 230         crt_list=(gnutls_x509_crt_t*)malloc(max*sizeof(gnutls_x509_crt_t));
 231         tmp.data = malloc(s.st_size);
 232         memset(tmp.data, 0, s.st_size);
 233         tmp.size = s.st_size;
 234         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 235                 perror("fread");
 236                 free(tmp.data);
 237                 free(crt_list);
 238                 return -EIO;
 239         }
 240
 241         if ((r = gnutls_x509_crt_list_import(crt_list, &max,
 242                         &tmp, format, flags)) < 0) {
 243                 debug_print("cert import failed: %s\n", gnutls_strerror(r));
 244                 free(tmp.data);
 245                 free(crt_list);
 246                 return r;
 247         }
 248         free(tmp.data);
 249         debug_print("got %d certs in crt_list! %p\n", max, &crt_list);
 250
 251         *cert_list = crt_list;
 252         *num_certs = max;
 253
 254         return r;
 255 }
 256
 257 /* return one certificate, read from file */
 258 static gnutls_x509_crt_t gnutls_d2i_X509_fp(FILE *fp, int format)
 259 {
 260         gnutls_x509_crt_t *certs = NULL;
 261         gnutls_x509_crt_t cert = NULL;
 262         int i, ncerts, r;
 263
 264         if ((r = gnutls_d2i_X509_list_fp(fp, format, &certs, &ncerts)) < 0) {
 265                 return NULL;
 266         }
 267
 268         if (ncerts == 0)
 269                 return NULL;
 270
 271         for (i = 1; i < ncerts; i++)
 272                 gnutls_x509_crt_deinit(certs[i]);
 273
 274         cert = certs[0];
 275         free(certs);
 276
 277         return cert;
 278 }
 279
 280 static gnutls_x509_privkey_t gnutls_d2i_key_fp(FILE *fp, int format)
 281 {
 282         gnutls_x509_privkey_t key = NULL;
 283         gnutls_datum_t tmp;
 284         struct stat s;
 285         int r;
 286         if (fstat(fileno(fp), &s) < 0) {
 287                 perror("fstat");
 288                 return NULL;
 289         }
 290         tmp.data = malloc(s.st_size);
 291         memset(tmp.data, 0, s.st_size);
 292         tmp.size = s.st_size;
 293         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 294                 perror("fread");
 295                 free(tmp.data);
 296                 return NULL;
 297         }
 298
 299         gnutls_x509_privkey_init(&key);
 300         if ((r = gnutls_x509_privkey_import(key, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM)) < 0) {
 301                 debug_print("key import failed: %s\n", gnutls_strerror(r));
 302                 gnutls_x509_privkey_deinit(key);
 303                 key = NULL;
 304         }
 305         free(tmp.data);
 306         debug_print("got key! %p\n", key);
 307         return key;
 308 }
 309
 310 static gnutls_pkcs12_t gnutls_d2i_PKCS12_fp(FILE *fp, int format)
 311 {
 312         gnutls_pkcs12_t p12 = NULL;
 313         gnutls_datum_t tmp;
 314         struct stat s;
 315         int r;
 316         if (fstat(fileno(fp), &s) < 0) {
 317                 log_error(LOG_PROTOCOL, _("Cannot stat P12 certificate file (%s)\n"),
 318                                   strerror(errno));
 319                 return NULL;
 320         }
 321         tmp.data = malloc(s.st_size);
 322         memset(tmp.data, 0, s.st_size);
 323         tmp.size = s.st_size;
 324         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 325                 log_error(LOG_PROTOCOL, _("Cannot read P12 certificate file (%s)\n"),
 326                                   strerror(errno));
 327                 free(tmp.data);
 328                 return NULL;
 329         }
 330
 331         gnutls_pkcs12_init(&p12);
 332
 333         if ((r = gnutls_pkcs12_import(p12, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM,0)) < 0) {
 334                 log_error(LOG_PROTOCOL, _("Cannot import P12 certificate file (%s)\n"),
 335                                   gnutls_strerror(r));
 336                 gnutls_pkcs12_deinit(p12);
 337                 p12 = NULL;
 338         }
 339         free(tmp.data);
 340         debug_print("got p12! %p\n", p12);
 341         return p12;
 342 }
 343
 344 #endif
 345
 346 static void ssl_certificate_save (SSLCertificate *cert)
 347 {
 348         gchar *file, *port;
 349         FILE *fp;
 350
 351         file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 352                           "certs", G_DIR_SEPARATOR_S, NULL);
 353
 354         if (!is_dir_exist(file))
 355                 make_dir_hier(file);
 356         g_free(file);
 357
 358         port = g_strdup_printf("%d", cert->port);
 359         file = get_certificate_path(cert->host, port, cert->fingerprint);
 360
 361         g_free(port);
 362         fp = g_fopen(file, "wb");
 363         if (fp == NULL) {
 364                 g_free(file);
 365                 debug_print("Can't save certificate !\n");
 366                 return;
 367         }
 368 #ifdef USE_GNUTLS
 369         gnutls_i2d_X509_fp(fp, cert->x509_cert);
 370 #else
 371         i2d_X509_fp(fp, cert->x509_cert);
 372 #endif
 373         g_free(file);
 374         fclose(fp);
 375
 376 }
 377
 378 void ssl_certificate_destroy(SSLCertificate *cert)
 379 {
 380         if (cert == NULL)
 381                 return;
 382
 383         if (cert->x509_cert)
 384                 gnutls_x509_crt_deinit(cert->x509_cert);
 385         g_free(cert->host);
 386         g_free(cert->fingerprint);
 387         g_free(cert);
 388         cert = NULL;
 389 }
 390
 391 void ssl_certificate_delete_from_disk(SSLCertificate *cert)
 392 {
 393         gchar *buf;
 394         gchar *file;
 395         buf = g_strdup_printf("%d", cert->port);
 396         file = get_certificate_path(cert->host, buf, cert->fingerprint);
 397         claws_unlink (file);
 398         g_free(file);
 399         g_free(buf);
 400 }
 401
 402 SSLCertificate *ssl_certificate_find (const gchar *host, gushort port, const gchar *fingerprint)
 403 {
 404         gchar *file = NULL;
 405         gchar *buf;
 406         SSLCertificate *cert = NULL;
 407         gnutls_x509_crt_t tmp_x509;
 408         FILE *fp = NULL;
 409         gboolean must_rename = FALSE;
 410
 411         buf = g_strdup_printf("%d", port);
 412
 413         if (fingerprint != NULL) {
 414                 file = get_certificate_path(host, buf, fingerprint);
 415                 fp = g_fopen(file, "rb");
 416         }
 417         if (fp == NULL) {
 418                 /* see if we have the old one */
 419                 debug_print("didn't get %s\n", file);
 420                 g_free(file);
 421                 file = get_certificate_path(host, buf, NULL);
 422                 fp = g_fopen(file, "rb");
 423
 424                 if (fp) {
 425                         debug_print("got %s\n", file);
 426                         must_rename = (fingerprint != NULL);
 427                 }
 428         } else {
 429                 debug_print("got %s first try\n", file);
 430         }
 431         if (fp == NULL) {
 432                 g_free(file);
 433                 g_free(buf);
 434                 return NULL;
 435         }
 436
 437         if ((tmp_x509 = gnutls_d2i_X509_fp(fp, 0)) != NULL) {
 438                 cert = ssl_certificate_new(tmp_x509, host, port);
 439                 debug_print("got cert %p\n", cert);
 440                 gnutls_x509_crt_deinit(tmp_x509);
 441         }
 442         fclose(fp);
 443         g_free(file);
 444
 445         if (must_rename) {
 446                 gchar *old = get_certificate_path(host, buf, NULL);
 447                 gchar *new = get_certificate_path(host, buf, fingerprint);
 448                 if (strcmp(old, new))
 449                         move_file(old, new, TRUE);
 450                 g_free(old);
 451                 g_free(new);
 452         }
 453         g_free(buf);
 454
 455         return cert;
 456 }
 457
 458 static gboolean ssl_certificate_compare (SSLCertificate *cert_a, SSLCertificate *cert_b)
 459 {
 460         char *output_a;
 461         char *output_b;
 462         size_t cert_size_a = 0, cert_size_b = 0;
 463         int r;
 464
 465         if (cert_a == NULL || cert_b == NULL)
 466                 return FALSE;
 467
 468         if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_a))
 469             != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 470                 g_warning("couldn't gnutls_x509_crt_export to get size a %s\n", gnutls_strerror(r));
 471                 return FALSE;
 472         }
 473
 474         if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_b))
 475             != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 476                 g_warning("couldn't gnutls_x509_crt_export to get size b %s\n", gnutls_strerror(r));
 477                 return FALSE;
 478         }
 479
 480         output_a = g_malloc(cert_size_a);
 481         output_b = g_malloc(cert_size_b);
 482         if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, output_a, &cert_size_a)) < 0) {
 483                 g_warning("couldn't gnutls_x509_crt_export a %s\n", gnutls_strerror(r));
 484                 g_free(output_a);
 485                 g_free(output_b);
 486                 return FALSE;
 487         }
 488         if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, output_b, &cert_size_b)) < 0) {
 489                 g_warning("couldn't gnutls_x509_crt_export b %s\n", gnutls_strerror(r));
 490                 g_free(output_a);
 491                 g_free(output_b);
 492                 return FALSE;
 493         }
 494         if (cert_size_a != cert_size_b) {
 495                 g_warning("size differ %zd %zd\n", cert_size_a, cert_size_b);
 496                 g_free(output_a);
 497                 g_free(output_b);
 498                 return FALSE;
 499         }
 500         if (memcmp(output_a, output_b, cert_size_a)) {
 501                 g_warning("contents differ\n");
 502                 g_free(output_a);
 503                 g_free(output_b);
 504                 return FALSE;
 505         }
 506         g_free(output_a);
 507         g_free(output_b);
 508
 509         return TRUE;
 510 }
 511
 512 static guint check_cert(gnutls_x509_crt_t cert)
 513 {
 514         gnutls_x509_crt_t *ca_list;
 515         unsigned int max = 512;
 516         unsigned int flags = 0;
 517         int r, i;
 518         unsigned int status;
 519         FILE *fp;
 520
 521         if (claws_ssl_get_cert_file())
 522                 fp = g_fopen(claws_ssl_get_cert_file(), "r");
 523         else
 524                 return (guint)-1;
 525
 526         if ((r = gnutls_d2i_X509_list_fp(fp, GNUTLS_X509_FMT_PEM, &ca_list, &max)) < 0) {
 527                 debug_print("cert import failed: %s\n", gnutls_strerror(r));
 528                 fclose(fp);
 529                 return (guint)-1;
 530         }
 531
 532         r = gnutls_x509_crt_verify(cert, ca_list, max, flags, &status);
 533         fclose(fp);
 534
 535         for (i = 0; i < max; i++)
 536                 gnutls_x509_crt_deinit(ca_list[i]);
 537         free(ca_list);
 538
 539         if (r < 0)
 540                 return (guint)-1;
 541         else
 542                 return status;
 543
 544 }
 545
 546 char *ssl_certificate_check_signer (gnutls_x509_crt_t cert, guint status)
 547 {
 548         if (status == (guint)-1) {
 549                 status = check_cert(cert);
 550                 if (status == -1)
 551                         return g_strdup(_("Uncheckable"));
 552         }
 553         if (status & GNUTLS_CERT_INVALID) {
 554                 if (gnutls_x509_crt_check_issuer(cert, cert))
 555                         return g_strdup(_("Self-signed certificate"));
 556         }
 557         if (status & GNUTLS_CERT_REVOKED)
 558                 return g_strdup(_("Revoked certificate"));
 559         if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 560                 return g_strdup(_("No certificate issuer found"));
 561         if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 562                 return g_strdup(_("Certificate issuer is not a CA"));
 563
 564
 565         return NULL;
 566 }
 567
 568 gboolean ssl_certificate_check (gnutls_x509_crt_t x509_cert, guint status, const gchar *host, gushort port)
 569 {
 570         SSLCertificate *current_cert = NULL;
 571         SSLCertificate *known_cert;
 572         SSLCertHookData cert_hook_data;
 573         gchar *fingerprint;
 574         size_t n;
 575         unsigned char md[128];
 576
 577         current_cert = ssl_certificate_new(x509_cert, host, port);
 578
 579         if (current_cert == NULL) {
 580                 debug_print("Buggy certificate !\n");
 581                 return FALSE;
 582         }
 583
 584         current_cert->status = status;
 585         /* fingerprint */
 586         n = 128;
 587         gnutls_x509_crt_get_fingerprint(x509_cert, GNUTLS_DIG_MD5, md, &n);
 588         fingerprint = readable_fingerprint(md, n);
 589
 590         known_cert = ssl_certificate_find(host, port, fingerprint);
 591
 592         g_free(fingerprint);
 593
 594         if (known_cert == NULL) {
 595                 cert_hook_data.cert = current_cert;
 596                 cert_hook_data.old_cert = NULL;
 597                 cert_hook_data.expired = FALSE;
 598                 cert_hook_data.accept = FALSE;
 599
 600                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 601
 602                 if (!cert_hook_data.accept) {
 603                         ssl_certificate_destroy(current_cert);
 604                         return FALSE;
 605                 } else {
 606                         ssl_certificate_save(current_cert);
 607                         ssl_certificate_destroy(current_cert);
 608                         return TRUE;
 609                 }
 610         } else if (!ssl_certificate_compare (current_cert, known_cert)) {
 611                 cert_hook_data.cert = current_cert;
 612                 cert_hook_data.old_cert = known_cert;
 613                 cert_hook_data.expired = FALSE;
 614                 cert_hook_data.accept = FALSE;
 615
 616                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 617
 618                 if (!cert_hook_data.accept) {
 619                         ssl_certificate_destroy(current_cert);
 620                         ssl_certificate_destroy(known_cert);
 621                         return FALSE;
 622                 } else {
 623                         ssl_certificate_save(current_cert);
 624                         ssl_certificate_destroy(current_cert);
 625                         ssl_certificate_destroy(known_cert);
 626                         return TRUE;
 627                 }
 628         } else if (gnutls_x509_crt_get_expiration_time(current_cert->x509_cert) < time(NULL)) {
 629                 gchar *tmp = g_strdup_printf("%s:%d", current_cert->host, current_cert->port);
 630
 631                 if (warned_expired == NULL)
 632                         warned_expired = g_hash_table_new(g_str_hash, g_str_equal);
 633
 634                 if (g_hash_table_lookup(warned_expired, tmp)) {
 635                         g_free(tmp);
 636                         ssl_certificate_destroy(current_cert);
 637                         ssl_certificate_destroy(known_cert);
 638                         return TRUE;
 639                 }
 640
 641                 cert_hook_data.cert = current_cert;
 642                 cert_hook_data.old_cert = NULL;
 643                 cert_hook_data.expired = TRUE;
 644                 cert_hook_data.accept = FALSE;
 645
 646                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 647
 648                 if (!cert_hook_data.accept) {
 649                         g_free(tmp);
 650                         ssl_certificate_destroy(current_cert);
 651                         ssl_certificate_destroy(known_cert);
 652                         return FALSE;
 653                 } else {
 654                         g_hash_table_insert(warned_expired, tmp, GINT_TO_POINTER(1));
 655                         ssl_certificate_destroy(current_cert);
 656                         ssl_certificate_destroy(known_cert);
 657                         return TRUE;
 658                 }
 659         }
 660
 661         ssl_certificate_destroy(current_cert);
 662         ssl_certificate_destroy(known_cert);
 663         return TRUE;
 664 }
 665
 666 gboolean ssl_certificate_check_chain(gnutls_x509_crt_t *certs, gint chain_len, const gchar *host, gushort port)
 667 {
 668         int ncas = 0, ncrls = 0;
 669         gnutls_x509_crt_t *cas = NULL;
 670         gnutls_x509_crl_t *crls = NULL;
 671         gboolean result = FALSE;
 672         int i;
 673         gint status;
 674
 675         if (claws_ssl_get_cert_file()) {
 676                 FILE *fp = g_fopen(claws_ssl_get_cert_file(), "rb");
 677                 int r = -errno;
 678
 679                 if (fp) {
 680                         r = gnutls_d2i_X509_list_fp(fp, GNUTLS_X509_FMT_PEM, &cas, &ncas);
 681                         fclose(fp);
 682                 }
 683
 684                 if (r < 0)
 685                         g_warning("Can't read SSL_CERT_FILE %s: %s\n",
 686                                 claws_ssl_get_cert_file(),
 687                                 gnutls_strerror(r));
 688         } else {
 689                 debug_print("Can't find SSL ca-certificates file\n");
 690         }
 691
 692
 693         gnutls_x509_crt_list_verify (certs,
 694                              chain_len,
 695                              cas, ncas,
 696                              NULL, 0,
 697                              GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT,
 698                              &status);
 699
 700         result = ssl_certificate_check(certs[0], status, host, port);
 701
 702         for (i = 0; i < ncas; i++)
 703                 gnutls_x509_crt_deinit(cas[i]);
 704         free(cas);
 705
 706         return result;
 707 }
 708
 709 gnutls_x509_crt_t ssl_certificate_get_x509_from_pem_file(const gchar *file)
 710 {
 711         gnutls_x509_crt_t x509 = NULL;
 712         if (!file)
 713                 return NULL;
 714
 715         if (is_file_exist(file)) {
 716                 FILE *fp = g_fopen(file, "r");
 717                 if (fp) {
 718                         x509 = gnutls_d2i_X509_fp(fp, 1);
 719                         fclose(fp);
 720                         return x509;
 721                 } else {
 722                         log_error(LOG_PROTOCOL, _("Cannot open certificate file %s: %s\n"),
 723                                   file, strerror(errno));
 724                 }
 725         } else {
 726                 log_error(LOG_PROTOCOL, _("Certificate file %s missing (%s)\n"),
 727                           file, strerror(errno));
 728         }
 729         return NULL;
 730 }
 731
 732 gnutls_x509_privkey_t ssl_certificate_get_pkey_from_pem_file(const gchar *file)
 733 {
 734         gnutls_x509_privkey_t key = NULL;
 735         if (!file)
 736                 return NULL;
 737
 738         if (is_file_exist(file)) {
 739                 FILE *fp = g_fopen(file, "r");
 740                 if (fp) {
 741                         key = gnutls_d2i_key_fp(fp, 1);
 742                         fclose(fp);
 743                         return key;
 744                 } else {
 745                         log_error(LOG_PROTOCOL, _("Cannot open key file %s (%s)\n"),
 746                         file, strerror(errno));
 747                 }
 748         } else {
 749                 log_error(LOG_PROTOCOL, _("Key file %s missing (%s)\n"), file,
 750                           strerror(errno));
 751         }
 752         return NULL;
 753 }
 754
 755 /* From GnuTLS lib/gnutls_x509.c */
 756 static int
 757 parse_pkcs12 (gnutls_pkcs12_t p12,
 758               const char *password,
 759               gnutls_x509_privkey_t * key,
 760               gnutls_x509_crt_t * cert)
 761 {
 762   gnutls_pkcs12_bag_t bag = NULL;
 763   int index = 0;
 764   int ret;
 765
 766   for (;;)
 767     {
 768       int elements_in_bag;
 769       int i;
 770
 771       ret = gnutls_pkcs12_bag_init (&bag);
 772       if (ret < 0)
 773         {
 774           bag = NULL;
 775           goto done;
 776         }
 777
 778       ret = gnutls_pkcs12_get_bag (p12, index, bag);
 779       if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
 780         break;
 781       if (ret < 0)
 782         {
 783           goto done;
 784         }
 785
 786       ret = gnutls_pkcs12_bag_get_type (bag, 0);
 787       if (ret < 0)
 788         {
 789           goto done;
 790         }
 791
 792       if (ret == GNUTLS_BAG_ENCRYPTED)
 793         {
 794           ret = gnutls_pkcs12_bag_decrypt (bag, password);
 795           if (ret < 0)
 796             {
 797               goto done;
 798             }
 799         }
 800
 801       elements_in_bag = gnutls_pkcs12_bag_get_count (bag);
 802       if (elements_in_bag < 0)
 803         {
 804           goto done;
 805         }
 806
 807       for (i = 0; i < elements_in_bag; i++)
 808         {
 809           int type;
 810           gnutls_datum_t data;
 811
 812           type = gnutls_pkcs12_bag_get_type (bag, i);
 813           if (type < 0)
 814             {
 815               goto done;
 816             }
 817
 818           ret = gnutls_pkcs12_bag_get_data (bag, i, &data);
 819           if (ret < 0)
 820             {
 821               goto done;
 822             }
 823
 824           switch (type)
 825             {
 826             case GNUTLS_BAG_PKCS8_ENCRYPTED_KEY:
 827             case GNUTLS_BAG_PKCS8_KEY:
 828               ret = gnutls_x509_privkey_init (key);
 829               if (ret < 0)
 830                 {
 831                   goto done;
 832                 }
 833
 834               ret = gnutls_x509_privkey_import_pkcs8
 835                 (*key, &data, GNUTLS_X509_FMT_DER, password,
 836                  type == GNUTLS_BAG_PKCS8_KEY ? GNUTLS_PKCS_PLAIN : 0);
 837               if (ret < 0)
 838                 {
 839                   goto done;
 840                 }
 841               break;
 842
 843             case GNUTLS_BAG_CERTIFICATE:
 844               ret = gnutls_x509_crt_init (cert);
 845               if (ret < 0)
 846                 {
 847                   goto done;
 848                 }
 849
 850               ret =
 851                 gnutls_x509_crt_import (*cert, &data, GNUTLS_X509_FMT_DER);
 852               if (ret < 0)
 853                 {
 854                   goto done;
 855                 }
 856               break;
 857
 858             case GNUTLS_BAG_ENCRYPTED:
 859               /* XXX Bother to recurse one level down?  Unlikely to
 860                  use the same password anyway. */
 861             case GNUTLS_BAG_EMPTY:
 862             default:
 863               break;
 864             }
 865         }
 866
 867       index++;
 868       gnutls_pkcs12_bag_deinit (bag);
 869     }
 870
 871   ret = 0;
 872
 873 done:
 874   if (bag)
 875     gnutls_pkcs12_bag_deinit (bag);
 876
 877   return ret;
 878 }
 879 void ssl_certificate_get_x509_and_pkey_from_p12_file(const gchar *file, const gchar *password,
 880                         gnutls_x509_crt_t *x509, gnutls_x509_privkey_t *pkey)
 881 {
 882         gnutls_pkcs12_t p12 = NULL;
 883
 884         int r;
 885
 886         *x509 = NULL;
 887         *pkey = NULL;
 888         if (!file)
 889                 return;
 890
 891         if (is_file_exist(file)) {
 892                 FILE *fp = g_fopen(file, "r");
 893                 if (fp) {
 894                         p12 = gnutls_d2i_PKCS12_fp(fp, 0);
 895                         fclose(fp);
 896                         if (!p12) {
 897                                 log_error(LOG_PROTOCOL, _("Failed to read P12 certificate file %s\n"), file);
 898                         }
 899                 } else {
 900                         log_error(LOG_PROTOCOL, _("Cannot open P12 certificate file %s (%s)\n"),
 901                                   file, strerror(errno));
 902                 }
 903         } else {
 904                 log_error(LOG_PROTOCOL, _("P12 Certificate file %s missing (%s)\n"), file,
 905                           strerror(errno));
 906         }
 907         if (p12 != NULL) {
 908                 if ((r = parse_pkcs12(p12, password, pkey, x509)) == 0) {
 909                         debug_print("got p12\n");
 910                 } else {
 911                         log_error(LOG_PROTOCOL, "%s\n", gnutls_strerror(r));
 912                 }
 913                 gnutls_pkcs12_deinit(p12);
 914         }
 915 }
 916
 917 gboolean ssl_certificate_check_subject_cn(SSLCertificate *cert)
 918 {
 919         return gnutls_x509_crt_check_hostname(cert->x509_cert, cert->host) != 0;
 920 }
 921
 922 gchar *ssl_certificate_get_subject_cn(SSLCertificate *cert)
 923 {
 924         gchar subject_cn[BUFFSIZE];
 925         size_t n = BUFFSIZE;
 926
 927         if(gnutls_x509_crt_get_dn_by_oid(cert->x509_cert,
 928                 GNUTLS_OID_X520_COMMON_NAME, 0, 0, subject_cn, &n))
 929                 strncpy(subject_cn, _("<not in certificate>"), BUFFSIZE);
 930
 931         return g_strdup(subject_cn);
 932 }
 933
 934 #endif /* USE_GNUTLS */