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