src/common/ssl_certificate.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2007 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 #endif
  24
  25 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
  26 #if USE_OPENSSL
  27 #include <openssl/ssl.h>
  28 #else
  29 #include <gnutls/gnutls.h>
  30 #include <gnutls/x509.h>
  31 #include <gnutls/pkcs12.h>
  32 #include <sys/stat.h>
  33 #include <unistd.h>
  34 #include <string.h>
  35 #endif
  36 #include <sys/types.h>
  37 #include <stdio.h>
  38 #include <glib.h>
  39 #include <glib/gi18n.h>
  40 #ifdef G_OS_WIN32
  41 #  include <winsock2.h>
  42 #else
  43 #  include <sys/socket.h>
  44 #  include <netinet/in.h>
  45 #  include <netdb.h>
  46 #endif /* G_OS_WIN32 */
  47 #include "ssl_certificate.h"
  48 #include "utils.h"
  49 #include "log.h"
  50 #include "socket.h"
  51 #include "hooks.h"
  52 #include "defs.h"
  53
  54 static GHashTable *warned_expired = NULL;
  55
  56 gboolean prefs_common_unsafe_ssl_certs(void);
  57
  58 static gchar *get_certificate_path(const gchar *host, const gchar *port, const gchar *fp)
  59 {
  60         if (fp != NULL && prefs_common_unsafe_ssl_certs())
  61                 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
  62                           "certs", G_DIR_SEPARATOR_S,
  63                           host, ".", port, ".", fp, ".cert", NULL);
  64         else
  65                 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
  66                           "certs", G_DIR_SEPARATOR_S,
  67                           host, ".", port, ".cert", NULL);
  68 }
  69
  70 #if USE_OPENSSL
  71 static SSLCertificate *ssl_certificate_new_lookup(X509 *x509_cert, gchar *host, gushort port, gboolean lookup);
  72 #else
  73 static SSLCertificate *ssl_certificate_new_lookup(gnutls_x509_crt x509_cert, gchar *host, gushort port, gboolean lookup);
  74 #endif
  75 #if USE_OPENSSL
  76 /* from Courier */
  77 time_t asn1toTime(ASN1_TIME *asn1Time)
  78 {
  79         struct tm tm;
  80         int offset;
  81
  82         if (asn1Time == NULL || asn1Time->length < 13)
  83                 return 0;
  84
  85         memset(&tm, 0, sizeof(tm));
  86
  87 #define N2(n)   ((asn1Time->data[n]-'0')*10 + asn1Time->data[(n)+1]-'0')
  88
  89 #define CPY(f,n) (tm.f=N2(n))
  90
  91         CPY(tm_year,0);
  92
  93         if(tm.tm_year < 50)
  94                 tm.tm_year += 100; /* Sux */
  95
  96         CPY(tm_mon, 2);
  97         --tm.tm_mon;
  98         CPY(tm_mday, 4);
  99         CPY(tm_hour, 6);
 100         CPY(tm_min, 8);
 101         CPY(tm_sec, 10);
 102
 103         offset=0;
 104
 105         if (asn1Time->data[12] != 'Z')
 106         {
 107                 if (asn1Time->length < 17)
 108                         return 0;
 109
 110                 offset=N2(13)*3600+N2(15)*60;
 111
 112                 if (asn1Time->data[12] == '-')
 113                         offset= -offset;
 114         }
 115
 116 #undef N2
 117 #undef CPY
 118
 119         return mktime(&tm)-offset;
 120 }
 121 #endif
 122
 123 static char * get_fqdn(char *host)
 124 {
 125 #ifdef INET6
 126         gint gai_err;
 127         struct addrinfo hints, *res;
 128 #else
 129         struct hostent *hp;
 130 #endif
 131
 132         if (host == NULL || strlen(host) == 0)
 133                 return g_strdup("");
 134 #ifdef INET6
 135         memset(&hints, 0, sizeof(hints));
 136         hints.ai_flags = AI_CANONNAME;
 137         hints.ai_family = AF_UNSPEC;
 138         hints.ai_socktype = SOCK_STREAM;
 139         hints.ai_protocol = IPPROTO_TCP;
 140
 141         gai_err = getaddrinfo(host, NULL, &hints, &res);
 142         if (gai_err != 0) {
 143                 g_warning("getaddrinfo for %s failed: %s\n",
 144                           host, gai_strerror(gai_err));
 145                 return g_strdup(host);
 146         }
 147         if (res != NULL) {
 148                 if (res->ai_canonname && strlen(res->ai_canonname)) {
 149                         gchar *fqdn = g_strdup(res->ai_canonname);
 150                         freeaddrinfo(res);
 151                         return fqdn;
 152                 } else {
 153                         freeaddrinfo(res);
 154                         return g_strdup(host);
 155                 }
 156         } else {
 157                 return g_strdup(host);
 158         }
 159 #else
 160         hp = my_gethostbyname(host);
 161         if (hp == NULL)
 162                 return g_strdup(host); /*caller should free*/
 163         else
 164                 return g_strdup(hp->h_name);
 165 #endif
 166 }
 167
 168 char * readable_fingerprint(unsigned char *src, int len)
 169 {
 170         int i=0;
 171         char * ret;
 172
 173         if (src == NULL)
 174                 return NULL;
 175         ret = g_strdup("");
 176         while (i < len) {
 177                 char *tmp2;
 178                 if(i>0)
 179                         tmp2 = g_strdup_printf("%s:%02X", ret, src[i]);
 180                 else
 181                         tmp2 = g_strdup_printf("%02X", src[i]);
 182                 g_free(ret);
 183                 ret = g_strdup(tmp2);
 184                 g_free(tmp2);
 185                 i++;
 186         }
 187         return ret;
 188 }
 189
 190 #if USE_GNUTLS
 191 static gnutls_x509_crt x509_crt_copy(gnutls_x509_crt src)
 192 {
 193     int ret;
 194     size_t size;
 195     gnutls_datum tmp;
 196     gnutls_x509_crt dest;
 197
 198     if (gnutls_x509_crt_init(&dest) != 0) {
 199         g_warning("couldn't gnutls_x509_crt_init\n");
 200         return NULL;
 201     }
 202
 203     if (gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, NULL, &size)
 204         != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 205         g_warning("couldn't gnutls_x509_crt_export to get size\n");
 206         gnutls_x509_crt_deinit(dest);
 207         return NULL;
 208     }
 209
 210     tmp.data = malloc(size);
 211     memset(tmp.data, 0, size);
 212     ret = gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, tmp.data, &size);
 213     if (ret == 0) {
 214         tmp.size = size;
 215         ret = gnutls_x509_crt_import(dest, &tmp, GNUTLS_X509_FMT_DER);
 216         if (ret) {
 217                 g_warning("couldn't gnutls_x509_crt_import for real (%d %s)\n", ret, gnutls_strerror(ret));
 218                 gnutls_x509_crt_deinit(dest);
 219                 dest = NULL;
 220         }
 221     } else {
 222         g_warning("couldn't gnutls_x509_crt_export for real (%d %s)\n", ret, gnutls_strerror(ret));
 223         gnutls_x509_crt_deinit(dest);
 224         dest = NULL;
 225     }
 226
 227     free(tmp.data);
 228     return dest;
 229 }
 230 #endif
 231
 232 #if USE_OPENSSL
 233 static SSLCertificate *ssl_certificate_new_lookup(X509 *x509_cert, gchar *host, gushort port, gboolean lookup)
 234 #else
 235 static SSLCertificate *ssl_certificate_new_lookup(gnutls_x509_crt x509_cert, gchar *host, gushort port, gboolean lookup)
 236 #endif
 237 {
 238         SSLCertificate *cert = g_new0(SSLCertificate, 1);
 239         unsigned int n;
 240         unsigned char md[128];
 241
 242         if (host == NULL || x509_cert == NULL) {
 243                 ssl_certificate_destroy(cert);
 244                 return NULL;
 245         }
 246 #if USE_OPENSSL
 247         cert->x509_cert = X509_dup(x509_cert);
 248 #else
 249         cert->x509_cert = x509_crt_copy(x509_cert);
 250         cert->status = (guint)-1;
 251 #endif
 252         if (lookup)
 253                 cert->host = get_fqdn(host);
 254         else
 255                 cert->host = g_strdup(host);
 256         cert->port = port;
 257
 258         /* fingerprint */
 259 #if USE_OPENSSL
 260         X509_digest(cert->x509_cert, EVP_md5(), md, &n);
 261         cert->fingerprint = readable_fingerprint(md, (int)n);
 262 #else
 263         n = 128;
 264         gnutls_x509_crt_get_fingerprint(cert->x509_cert, GNUTLS_DIG_MD5, md, &n);
 265         cert->fingerprint = readable_fingerprint(md, (int)n);
 266 #endif
 267         return cert;
 268 }
 269
 270 #ifdef USE_GNUTLS
 271 static void gnutls_i2d_X509_fp(FILE *fp, gnutls_x509_crt x509_cert)
 272 {
 273         char output[10*1024];
 274         size_t cert_size = 10*1024;
 275         int r;
 276
 277         if ((r = gnutls_x509_crt_export(x509_cert, GNUTLS_X509_FMT_DER, output, &cert_size)) < 0) {
 278                 g_warning("couldn't export cert %s (%d)\n", gnutls_strerror(r), cert_size);
 279                 return;
 280         }
 281         debug_print("writing %zd bytes\n",cert_size);
 282         if (fwrite(&output, 1, cert_size, fp) < cert_size) {
 283                 g_warning("failed to write cert\n");
 284         }
 285 }
 286
 287 size_t gnutls_i2d_X509(gnutls_x509_crt x509_cert, unsigned char **output)
 288 {
 289         size_t cert_size = 10*1024;
 290         int r;
 291
 292         if (output == NULL)
 293                 return 0;
 294
 295         *output = malloc(cert_size);
 296
 297         if ((r = gnutls_x509_crt_export(x509_cert, GNUTLS_X509_FMT_DER, *output, &cert_size)) < 0) {
 298                 g_warning("couldn't export cert %s (%d)\n", gnutls_strerror(r), cert_size);
 299                 free(*output);
 300                 *output = NULL;
 301                 return 0;
 302         }
 303         return cert_size;
 304 }
 305
 306 size_t gnutls_i2d_PrivateKey(gnutls_x509_privkey pkey, unsigned char **output)
 307 {
 308         size_t key_size = 10*1024;
 309         int r;
 310
 311         if (output == NULL)
 312                 return 0;
 313
 314         *output = malloc(key_size);
 315
 316         if ((r = gnutls_x509_privkey_export(pkey, GNUTLS_X509_FMT_DER, *output, &key_size)) < 0) {
 317                 g_warning("couldn't export key %s (%d)\n", gnutls_strerror(r), key_size);
 318                 free(*output);
 319                 *output = NULL;
 320                 return 0;
 321         }
 322         return key_size;
 323 }
 324
 325 static gnutls_x509_crt gnutls_d2i_X509_fp(FILE *fp, int format)
 326 {
 327         gnutls_x509_crt cert = NULL;
 328         gnutls_datum tmp;
 329         struct stat s;
 330         int r;
 331         if (fstat(fileno(fp), &s) < 0) {
 332                 perror("fstat");
 333                 return NULL;
 334         }
 335         tmp.data = malloc(s.st_size);
 336         memset(tmp.data, 0, s.st_size);
 337         tmp.size = s.st_size;
 338         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 339                 perror("fread");
 340                 free(tmp.data);
 341                 return NULL;
 342         }
 343
 344         gnutls_x509_crt_init(&cert);
 345         if ((r = gnutls_x509_crt_import(cert, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM)) < 0) {
 346                 debug_print("cert import failed: %s\n", gnutls_strerror(r));
 347                 gnutls_x509_crt_deinit(cert);
 348                 cert = NULL;
 349         }
 350         free(tmp.data);
 351         debug_print("got cert! %p\n", cert);
 352         return cert;
 353 }
 354
 355 static gnutls_x509_privkey gnutls_d2i_key_fp(FILE *fp, int format)
 356 {
 357         gnutls_x509_privkey key = NULL;
 358         gnutls_datum tmp;
 359         struct stat s;
 360         int r;
 361         if (fstat(fileno(fp), &s) < 0) {
 362                 perror("fstat");
 363                 return NULL;
 364         }
 365         tmp.data = malloc(s.st_size);
 366         memset(tmp.data, 0, s.st_size);
 367         tmp.size = s.st_size;
 368         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 369                 perror("fread");
 370                 free(tmp.data);
 371                 return NULL;
 372         }
 373
 374         gnutls_x509_privkey_init(&key);
 375         if ((r = gnutls_x509_privkey_import(key, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM)) < 0) {
 376                 debug_print("key import failed: %s\n", gnutls_strerror(r));
 377                 gnutls_x509_privkey_deinit(key);
 378                 key = NULL;
 379         }
 380         free(tmp.data);
 381         debug_print("got key! %p\n", key);
 382         return key;
 383 }
 384
 385 static gnutls_pkcs12_t gnutls_d2i_PKCS12_fp(FILE *fp, int format)
 386 {
 387         gnutls_pkcs12_t p12 = NULL;
 388         gnutls_datum tmp;
 389         struct stat s;
 390         int r;
 391         if (fstat(fileno(fp), &s) < 0) {
 392                 perror("fstat");
 393                 return NULL;
 394         }
 395         tmp.data = malloc(s.st_size);
 396         memset(tmp.data, 0, s.st_size);
 397         tmp.size = s.st_size;
 398         if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
 399                 perror("fread");
 400                 free(tmp.data);
 401                 return NULL;
 402         }
 403
 404         gnutls_pkcs12_init(&p12);
 405
 406         if ((r = gnutls_pkcs12_import(p12, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM,0)) < 0) {
 407                 g_warning("p12 import failed: %s\n", gnutls_strerror(r));
 408                 gnutls_pkcs12_deinit(p12);
 409                 p12 = NULL;
 410         }
 411         free(tmp.data);
 412         debug_print("got p12! %p\n", p12);
 413         return p12;
 414 }
 415
 416 #endif
 417
 418 static void ssl_certificate_save (SSLCertificate *cert)
 419 {
 420         gchar *file, *port;
 421         FILE *fp;
 422
 423         file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 424                           "certs", G_DIR_SEPARATOR_S, NULL);
 425
 426         if (!is_dir_exist(file))
 427                 make_dir_hier(file);
 428         g_free(file);
 429
 430         port = g_strdup_printf("%d", cert->port);
 431         file = get_certificate_path(cert->host, port, cert->fingerprint);
 432
 433         g_free(port);
 434         fp = g_fopen(file, "wb");
 435         if (fp == NULL) {
 436                 g_free(file);
 437                 debug_print("Can't save certificate !\n");
 438                 return;
 439         }
 440 #ifdef USE_GNUTLS
 441         gnutls_i2d_X509_fp(fp, cert->x509_cert);
 442 #else
 443         i2d_X509_fp(fp, cert->x509_cert);
 444 #endif
 445         g_free(file);
 446         fclose(fp);
 447
 448 }
 449
 450 void ssl_certificate_destroy(SSLCertificate *cert)
 451 {
 452         if (cert == NULL)
 453                 return;
 454
 455         if (cert->x509_cert)
 456 #if USE_OPENSSL
 457                 X509_free(cert->x509_cert);
 458 #else
 459                 gnutls_x509_crt_deinit(cert->x509_cert);
 460 #endif
 461         g_free(cert->host);
 462         g_free(cert->fingerprint);
 463         g_free(cert);
 464         cert = NULL;
 465 }
 466
 467 void ssl_certificate_delete_from_disk(SSLCertificate *cert)
 468 {
 469         gchar *buf;
 470         gchar *file;
 471         buf = g_strdup_printf("%d", cert->port);
 472         file = get_certificate_path(cert->host, buf, cert->fingerprint);
 473         claws_unlink (file);
 474         g_free(file);
 475         g_free(buf);
 476 }
 477
 478 SSLCertificate *ssl_certificate_find (gchar *host, gushort port, const gchar *fingerprint)
 479 {
 480         return ssl_certificate_find_lookup (host, port, fingerprint, TRUE);
 481 }
 482
 483 SSLCertificate *ssl_certificate_find_lookup (gchar *host, gushort port, const gchar *fingerprint, gboolean lookup)
 484 {
 485         gchar *file = NULL;
 486         gchar *buf;
 487         gchar *fqdn_host;
 488         SSLCertificate *cert = NULL;
 489 #if USE_OPENSSL
 490         X509 *tmp_x509;
 491 #else
 492         gnutls_x509_crt tmp_x509;
 493 #endif
 494         FILE *fp = NULL;
 495         gboolean must_rename = FALSE;
 496
 497         if (lookup)
 498                 fqdn_host = get_fqdn(host);
 499         else
 500                 fqdn_host = g_strdup(host);
 501
 502         buf = g_strdup_printf("%d", port);
 503
 504         if (fingerprint != NULL) {
 505                 file = get_certificate_path(fqdn_host, buf, fingerprint);
 506                 fp = g_fopen(file, "rb");
 507         }
 508         if (fp == NULL) {
 509                 /* see if we have the old one */
 510                 debug_print("didn't get %s\n", file);
 511                 g_free(file);
 512                 file = get_certificate_path(fqdn_host, buf, NULL);
 513                 fp = g_fopen(file, "rb");
 514
 515                 if (fp) {
 516                         debug_print("got %s\n", file);
 517                         must_rename = (fingerprint != NULL);
 518                 }
 519         } else {
 520                 debug_print("got %s first try\n", file);
 521         }
 522         if (fp == NULL) {
 523                 g_free(file);
 524                 g_free(fqdn_host);
 525                 g_free(buf);
 526                 return NULL;
 527         }
 528
 529 #if USE_OPENSSL
 530         if ((tmp_x509 = d2i_X509_fp(fp, 0)) != NULL) {
 531 #else
 532         if ((tmp_x509 = gnutls_d2i_X509_fp(fp, 0)) != NULL) {
 533 #endif
 534                 cert = ssl_certificate_new_lookup(tmp_x509, fqdn_host, port, lookup);
 535                 debug_print("got cert %p\n", cert);
 536 #if USE_OPENSSL
 537                 X509_free(tmp_x509);
 538 #else
 539                 gnutls_x509_crt_deinit(tmp_x509);
 540 #endif
 541         }
 542         fclose(fp);
 543         g_free(file);
 544
 545         if (must_rename) {
 546                 gchar *old = get_certificate_path(fqdn_host, buf, NULL);
 547                 gchar *new = get_certificate_path(fqdn_host, buf, fingerprint);
 548                 if (strcmp(old, new))
 549                         move_file(old, new, TRUE);
 550                 g_free(old);
 551                 g_free(new);
 552         }
 553         g_free(buf);
 554         g_free(fqdn_host);
 555
 556         return cert;
 557 }
 558
 559 static gboolean ssl_certificate_compare (SSLCertificate *cert_a, SSLCertificate *cert_b)
 560 {
 561 #ifdef USE_OPENSSL
 562         if (cert_a == NULL || cert_b == NULL)
 563                 return FALSE;
 564         else if (!X509_cmp(cert_a->x509_cert, cert_b->x509_cert))
 565                 return TRUE;
 566         else
 567                 return FALSE;
 568 #else
 569         char *output_a;
 570         char *output_b;
 571         size_t cert_size_a = 0, cert_size_b = 0;
 572         int r;
 573
 574         if (cert_a == NULL || cert_b == NULL)
 575                 return FALSE;
 576
 577         if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_a))
 578             != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 579                 g_warning("couldn't gnutls_x509_crt_export to get size a %s\n", gnutls_strerror(r));
 580                 return FALSE;
 581         }
 582
 583         if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_b))
 584             != GNUTLS_E_SHORT_MEMORY_BUFFER) {
 585                 g_warning("couldn't gnutls_x509_crt_export to get size b %s\n", gnutls_strerror(r));
 586                 return FALSE;
 587         }
 588
 589         output_a = malloc(cert_size_a);
 590         output_b = malloc(cert_size_b);
 591         if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, output_a, &cert_size_a)) < 0) {
 592                 g_warning("couldn't gnutls_x509_crt_export a %s\n", gnutls_strerror(r));
 593                 g_free(output_a);
 594                 g_free(output_b);
 595                 return FALSE;
 596         }
 597         if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, output_b, &cert_size_b)) < 0) {
 598                 g_warning("couldn't gnutls_x509_crt_export b %s\n", gnutls_strerror(r));
 599                 g_free(output_a);
 600                 g_free(output_b);
 601                 return FALSE;
 602         }
 603         if (cert_size_a != cert_size_b) {
 604                 g_warning("size differ %d %d\n", cert_size_a, cert_size_b);
 605                 g_free(output_a);
 606                 g_free(output_b);
 607                 return FALSE;
 608         }
 609         if (memcmp(output_a, output_b, cert_size_a)) {
 610                 g_warning("contents differ\n");
 611                 g_free(output_a);
 612                 g_free(output_b);
 613                 return FALSE;
 614         }
 615         g_free(output_a);
 616         g_free(output_b);
 617
 618         return TRUE;
 619 #endif
 620 }
 621
 622 #if USE_OPENSSL
 623 char *ssl_certificate_check_signer (X509 *cert)
 624 {
 625         X509_STORE_CTX store_ctx;
 626         X509_STORE *store = SSL_CTX_get_cert_store(ssl_get_ctx());
 627         char *err_msg = NULL;
 628
 629         if (store == NULL) {
 630                 g_print("Can't create X509_STORE\n");
 631                 return NULL;
 632         }
 633
 634         X509_STORE_CTX_init (&store_ctx, store, cert, NULL);
 635
 636         if(!X509_verify_cert (&store_ctx)) {
 637                 err_msg = g_strdup(X509_verify_cert_error_string(
 638                                         X509_STORE_CTX_get_error(&store_ctx)));
 639                 debug_print("Can't check signer: %s\n", err_msg);
 640                 X509_STORE_CTX_cleanup (&store_ctx);
 641                 return err_msg;
 642
 643         }
 644         X509_STORE_CTX_cleanup (&store_ctx);
 645         return NULL;
 646 }
 647 #else
 648 char *ssl_certificate_check_signer (gnutls_x509_crt cert, guint status)
 649 {
 650         if (status == (guint)-1)
 651                 return g_strdup(_("Uncheckable"));
 652
 653         if (status & GNUTLS_CERT_INVALID) {
 654                 if (gnutls_x509_crt_check_issuer(cert, cert))
 655                         return g_strdup(_("Self-signed certificate"));
 656         }
 657         if (status & GNUTLS_CERT_REVOKED)
 658                 return g_strdup(_("Revoked certificate"));
 659         if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 660                 return g_strdup(_("No certificate issuer found"));
 661         if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 662                 return g_strdup(_("Certificate issuer is not a CA"));
 663
 664
 665         return NULL;
 666 }
 667 #endif
 668
 669 #if USE_OPENSSL
 670 gboolean ssl_certificate_check (X509 *x509_cert, gchar *fqdn, gchar *host, gushort port)
 671 #else
 672 gboolean ssl_certificate_check (gnutls_x509_crt x509_cert, guint status, gchar *fqdn, gchar *host, gushort port)
 673 #endif
 674 {
 675         SSLCertificate *current_cert = NULL;
 676         SSLCertificate *known_cert;
 677         SSLCertHookData cert_hook_data;
 678         gchar *fqdn_host = NULL;
 679         gchar *fingerprint;
 680         unsigned int n;
 681         unsigned char md[128];
 682
 683         if (fqdn)
 684                 fqdn_host = g_strdup(fqdn);
 685         else if (host)
 686                 fqdn_host = get_fqdn(host);
 687         else {
 688                 g_warning("no host!\n");
 689                 return FALSE;
 690         }
 691
 692         current_cert = ssl_certificate_new_lookup(x509_cert, fqdn_host, port, FALSE);
 693
 694         if (current_cert == NULL) {
 695                 debug_print("Buggy certificate !\n");
 696                 g_free(fqdn_host);
 697                 return FALSE;
 698         }
 699
 700 #if USE_GNUTLS
 701         current_cert->status = status;
 702 #endif
 703         /* fingerprint */
 704 #if USE_OPENSSL
 705         X509_digest(x509_cert, EVP_md5(), md, &n);
 706         fingerprint = readable_fingerprint(md, (int)n);
 707 #else
 708         n = 128;
 709         gnutls_x509_crt_get_fingerprint(x509_cert, GNUTLS_DIG_MD5, md, &n);
 710         fingerprint = readable_fingerprint(md, (int)n);
 711 #endif
 712
 713         known_cert = ssl_certificate_find_lookup (fqdn_host, port, fingerprint, FALSE);
 714
 715         g_free(fingerprint);
 716         g_free(fqdn_host);
 717
 718         if (known_cert == NULL) {
 719                 cert_hook_data.cert = current_cert;
 720                 cert_hook_data.old_cert = NULL;
 721                 cert_hook_data.expired = FALSE;
 722                 cert_hook_data.accept = FALSE;
 723
 724                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 725
 726                 if (!cert_hook_data.accept) {
 727                         ssl_certificate_destroy(current_cert);
 728                         return FALSE;
 729                 } else {
 730                         ssl_certificate_save(current_cert);
 731                         ssl_certificate_destroy(current_cert);
 732                         return TRUE;
 733                 }
 734         } else if (!ssl_certificate_compare (current_cert, known_cert)) {
 735                 cert_hook_data.cert = current_cert;
 736                 cert_hook_data.old_cert = known_cert;
 737                 cert_hook_data.expired = FALSE;
 738                 cert_hook_data.accept = FALSE;
 739
 740                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 741
 742                 if (!cert_hook_data.accept) {
 743                         ssl_certificate_destroy(current_cert);
 744                         ssl_certificate_destroy(known_cert);
 745                         return FALSE;
 746                 } else {
 747                         ssl_certificate_save(current_cert);
 748                         ssl_certificate_destroy(current_cert);
 749                         ssl_certificate_destroy(known_cert);
 750                         return TRUE;
 751                 }
 752 #if USE_OPENSSL
 753         } else if (asn1toTime(X509_get_notAfter(current_cert->x509_cert)) < time(NULL)) {
 754 #else
 755         } else if (gnutls_x509_crt_get_expiration_time(current_cert->x509_cert) < time(NULL)) {
 756 #endif
 757                 gchar *tmp = g_strdup_printf("%s:%d", current_cert->host, current_cert->port);
 758
 759                 if (warned_expired == NULL)
 760                         warned_expired = g_hash_table_new(g_str_hash, g_str_equal);
 761
 762                 if (g_hash_table_lookup(warned_expired, tmp)) {
 763                         g_free(tmp);
 764                         ssl_certificate_destroy(current_cert);
 765                         ssl_certificate_destroy(known_cert);
 766                         return TRUE;
 767                 }
 768
 769                 cert_hook_data.cert = current_cert;
 770                 cert_hook_data.old_cert = NULL;
 771                 cert_hook_data.expired = TRUE;
 772                 cert_hook_data.accept = FALSE;
 773
 774                 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
 775
 776                 if (!cert_hook_data.accept) {
 777                         g_free(tmp);
 778                         ssl_certificate_destroy(current_cert);
 779                         ssl_certificate_destroy(known_cert);
 780                         return FALSE;
 781                 } else {
 782                         g_hash_table_insert(warned_expired, tmp, GINT_TO_POINTER(1));
 783                         ssl_certificate_destroy(current_cert);
 784                         ssl_certificate_destroy(known_cert);
 785                         return TRUE;
 786                 }
 787         }
 788
 789         ssl_certificate_destroy(current_cert);
 790         ssl_certificate_destroy(known_cert);
 791         return TRUE;
 792 }
 793
 794 #if USE_OPENSSL
 795 X509 *ssl_certificate_get_x509_from_pem_file(const gchar *file)
 796 {
 797         X509 *x509 = NULL;
 798         if (!file)
 799                 return NULL;
 800         if (is_file_exist(file)) {
 801                 FILE *fp = g_fopen(file, "r");
 802                 if (fp) {
 803                         x509 = PEM_read_X509(fp, NULL, NULL, NULL);
 804                         fclose(fp);
 805                         return x509;
 806                 }
 807         } else {
 808                 log_error(LOG_PROTOCOL, "Can not open certificate file %s\n", file);
 809         }
 810         return NULL;
 811 }
 812
 813 static int ssl_pkey_password_cb(char *buf, int max_len, int flag, void *pwd)
 814 {
 815         return 0;
 816 }
 817
 818 EVP_PKEY *ssl_certificate_get_pkey_from_pem_file(const gchar *file)
 819 {
 820         EVP_PKEY *pkey = NULL;
 821         if (!file)
 822                 return NULL;
 823         if (is_file_exist(file)) {
 824                 FILE *fp = g_fopen(file, "r");
 825                 if (fp) {
 826                         pkey = PEM_read_PrivateKey(fp, NULL, ssl_pkey_password_cb, NULL);
 827                         fclose(fp);
 828                         return pkey;
 829                 }
 830         } else {
 831                 log_error(LOG_PROTOCOL, "Can not open private key file %s\n", file);
 832         }
 833         return NULL;
 834 }
 835
 836 void ssl_certificate_get_x509_and_pkey_from_p12_file(const gchar *file, const gchar *password,
 837                         X509 **x509, EVP_PKEY **pkey)
 838 {
 839         PKCS12 *p12 = NULL;
 840         *x509 = NULL;
 841         *pkey = NULL;
 842
 843         if (!file)
 844                 return;
 845
 846         if (is_file_exist(file)) {
 847                 FILE *fp = g_fopen(file, "r");
 848                 if (fp) {
 849                         p12 = d2i_PKCS12_fp(fp, NULL);
 850                         fclose(fp);
 851                 }
 852         } else {
 853                 log_error(LOG_PROTOCOL, "Can not open certificate file %s\n", file);
 854         }
 855         if (p12 != NULL) {
 856                 if (PKCS12_parse(p12, password, pkey, x509, NULL) == 1) {
 857                         /* we got the correct password */
 858                 } else {
 859                         gchar *tmp = NULL;
 860                         hooks_invoke(SSL_CERT_GET_PASSWORD, &tmp);
 861                         if (PKCS12_parse(p12, tmp, pkey, x509, NULL) == 1) {
 862                                 debug_print("got p12\n");
 863                         } else {
 864                                 log_error(LOG_PROTOCOL, "%s\n", ERR_error_string(ERR_get_error(),NULL));
 865                         }
 866                 }
 867                 PKCS12_free(p12);
 868         }
 869 }
 870 #endif
 871
 872 #ifdef USE_GNUTLS
 873 gnutls_x509_crt ssl_certificate_get_x509_from_pem_file(const gchar *file)
 874 {
 875         gnutls_x509_crt x509 = NULL;
 876         if (!file)
 877                 return NULL;
 878
 879         if (is_file_exist(file)) {
 880                 FILE *fp = g_fopen(file, "r");
 881                 if (fp) {
 882                         x509 = gnutls_d2i_X509_fp(fp, 1);
 883                         fclose(fp);
 884                         return x509;
 885                 }
 886         } else {
 887                 log_error(LOG_PROTOCOL, "Can not open certificate file %s\n", file);
 888         }
 889         return NULL;
 890 }
 891
 892 gnutls_x509_privkey ssl_certificate_get_pkey_from_pem_file(const gchar *file)
 893 {
 894         gnutls_x509_privkey key = NULL;
 895         if (!file)
 896                 return NULL;
 897
 898         if (is_file_exist(file)) {
 899                 FILE *fp = g_fopen(file, "r");
 900                 if (fp) {
 901                         key = gnutls_d2i_key_fp(fp, 1);
 902                         fclose(fp);
 903                         return key;
 904                 }
 905         } else {
 906                 log_error(LOG_PROTOCOL, "Can not open key file %s\n", file);
 907         }
 908         return NULL;
 909 }
 910
 911 /* From GnuTLS lib/gnutls_x509.c */
 912 static int
 913 parse_pkcs12 (gnutls_pkcs12_t p12,
 914               const char *password,
 915               gnutls_x509_privkey * key,
 916               gnutls_x509_crt_t * cert)
 917 {
 918   gnutls_pkcs12_bag bag = NULL;
 919   int index = 0;
 920   int ret;
 921
 922   for (;;)
 923     {
 924       int elements_in_bag;
 925       int i;
 926
 927       ret = gnutls_pkcs12_bag_init (&bag);
 928       if (ret < 0)
 929         {
 930           bag = NULL;
 931           goto done;
 932         }
 933
 934       ret = gnutls_pkcs12_get_bag (p12, index, bag);
 935       if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
 936         break;
 937       if (ret < 0)
 938         {
 939           goto done;
 940         }
 941
 942       ret = gnutls_pkcs12_bag_get_type (bag, 0);
 943       if (ret < 0)
 944         {
 945           goto done;
 946         }
 947
 948       if (ret == GNUTLS_BAG_ENCRYPTED)
 949         {
 950           ret = gnutls_pkcs12_bag_decrypt (bag, password);
 951           if (ret < 0)
 952             {
 953               goto done;
 954             }
 955         }
 956
 957       elements_in_bag = gnutls_pkcs12_bag_get_count (bag);
 958       if (elements_in_bag < 0)
 959         {
 960           goto done;
 961         }
 962
 963       for (i = 0; i < elements_in_bag; i++)
 964         {
 965           int type;
 966           gnutls_datum data;
 967
 968           type = gnutls_pkcs12_bag_get_type (bag, i);
 969           if (type < 0)
 970             {
 971               goto done;
 972             }
 973
 974           ret = gnutls_pkcs12_bag_get_data (bag, i, &data);
 975           if (ret < 0)
 976             {
 977               goto done;
 978             }
 979
 980           switch (type)
 981             {
 982             case GNUTLS_BAG_PKCS8_ENCRYPTED_KEY:
 983             case GNUTLS_BAG_PKCS8_KEY:
 984               ret = gnutls_x509_privkey_init (key);
 985               if (ret < 0)
 986                 {
 987                   goto done;
 988                 }
 989
 990               ret = gnutls_x509_privkey_import_pkcs8
 991                 (*key, &data, GNUTLS_X509_FMT_DER, password,
 992                  type == GNUTLS_BAG_PKCS8_KEY ? GNUTLS_PKCS_PLAIN : 0);
 993               if (ret < 0)
 994                 {
 995                   goto done;
 996                 }
 997               break;
 998
 999             case GNUTLS_BAG_CERTIFICATE:
1000               ret = gnutls_x509_crt_init (cert);
1001               if (ret < 0)
1002                 {
1003                   goto done;
1004                 }
1005
1006               ret =
1007                 gnutls_x509_crt_import (*cert, &data, GNUTLS_X509_FMT_DER);
1008               if (ret < 0)
1009                 {
1010                   goto done;
1011                 }
1012               break;
1013
1014             case GNUTLS_BAG_ENCRYPTED:
1015               /* XXX Bother to recurse one level down?  Unlikely to
1016                  use the same password anyway. */
1017             case GNUTLS_BAG_EMPTY:
1018             default:
1019               break;
1020             }
1021         }
1022
1023       index++;
1024       gnutls_pkcs12_bag_deinit (bag);
1025     }
1026
1027   ret = 0;
1028
1029 done:
1030   if (bag)
1031     gnutls_pkcs12_bag_deinit (bag);
1032
1033   return ret;
1034 }
1035 void ssl_certificate_get_x509_and_pkey_from_p12_file(const gchar *file, const gchar *password,
1036                         gnutls_x509_crt *x509, gnutls_x509_privkey *pkey)
1037 {
1038         gnutls_pkcs12_t p12 = NULL;
1039
1040         int r;
1041
1042         *x509 = NULL;
1043         *pkey = NULL;
1044         if (!file)
1045                 return;
1046
1047         if (is_file_exist(file)) {
1048                 FILE *fp = g_fopen(file, "r");
1049                 if (fp) {
1050                         p12 = gnutls_d2i_PKCS12_fp(fp, 0);
1051                         fclose(fp);
1052                 }
1053         } else {
1054                 log_error(LOG_PROTOCOL, "Can not open certificate file %s\n", file);
1055         }
1056         if (p12 != NULL) {
1057                 if ((r = parse_pkcs12(p12, password, pkey, x509)) == 0) {
1058                         debug_print("got p12\n");
1059                 } else {
1060                         log_error(LOG_PROTOCOL, "%s\n", gnutls_strerror(r));
1061                 }
1062                 gnutls_pkcs12_deinit(p12);
1063         }
1064 }
1065 #endif
1066 #endif /* USE_OPENSSL */