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
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.
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.
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/>.
23 #include "claws-features.h"
27 #include <gnutls/gnutls.h>
28 #include <gnutls/x509.h>
29 #include <gnutls/pkcs12.h>
33 #include <sys/types.h>
36 #include <glib/gi18n.h>
38 # include <winsock2.h>
40 # include <sys/socket.h>
41 # include <netinet/in.h>
43 #endif /* G_OS_WIN32 */
44 #include "ssl_certificate.h"
51 static GHashTable *warned_expired = NULL;
53 gboolean prefs_common_unsafe_ssl_certs(void);
55 static gchar *get_certificate_path(const gchar *host, const gchar *port, const gchar *fp)
57 if (fp != NULL && prefs_common_unsafe_ssl_certs())
58 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
59 "certs", G_DIR_SEPARATOR_S,
60 host, ".", port, ".", fp, ".cert", NULL);
62 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
63 "certs", G_DIR_SEPARATOR_S,
64 host, ".", port, ".cert", NULL);
67 char * readable_fingerprint(unsigned char *src, int len)
78 tmp2 = g_strdup_printf("%s:%02X", ret, src[i]);
80 tmp2 = g_strdup_printf("%02X", src[i]);
90 static gnutls_x509_crt x509_crt_copy(gnutls_x509_crt src)
97 if (gnutls_x509_crt_init(&dest) != 0) {
98 g_warning("couldn't gnutls_x509_crt_init\n");
102 if (gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, NULL, &size)
103 != GNUTLS_E_SHORT_MEMORY_BUFFER) {
104 g_warning("couldn't gnutls_x509_crt_export to get size\n");
105 gnutls_x509_crt_deinit(dest);
109 tmp.data = malloc(size);
110 memset(tmp.data, 0, size);
111 ret = gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, tmp.data, &size);
114 ret = gnutls_x509_crt_import(dest, &tmp, GNUTLS_X509_FMT_DER);
116 g_warning("couldn't gnutls_x509_crt_import for real (%d %s)\n", ret, gnutls_strerror(ret));
117 gnutls_x509_crt_deinit(dest);
121 g_warning("couldn't gnutls_x509_crt_export for real (%d %s)\n", ret, gnutls_strerror(ret));
122 gnutls_x509_crt_deinit(dest);
131 static SSLCertificate *ssl_certificate_new(gnutls_x509_crt x509_cert, const gchar *host, gushort port)
133 SSLCertificate *cert = g_new0(SSLCertificate, 1);
135 unsigned char md[128];
137 if (host == NULL || x509_cert == NULL) {
138 ssl_certificate_destroy(cert);
141 cert->x509_cert = x509_crt_copy(x509_cert);
142 cert->status = (guint)-1;
143 cert->host = g_strdup(host);
148 gnutls_x509_crt_get_fingerprint(cert->x509_cert, GNUTLS_DIG_MD5, md, &n);
149 cert->fingerprint = readable_fingerprint(md, (int)n);
154 static void gnutls_i2d_X509_fp(FILE *fp, gnutls_x509_crt x509_cert)
156 char output[10*1024];
157 size_t cert_size = 10*1024;
160 if ((r = gnutls_x509_crt_export(x509_cert, GNUTLS_X509_FMT_DER, output, &cert_size)) < 0) {
161 g_warning("couldn't export cert %s (%zd)\n", gnutls_strerror(r), cert_size);
164 debug_print("writing %zd bytes\n",cert_size);
165 if (fwrite(&output, 1, cert_size, fp) < cert_size) {
166 g_warning("failed to write cert\n");
170 size_t gnutls_i2d_X509(gnutls_x509_crt x509_cert, unsigned char **output)
172 size_t cert_size = 10*1024;
178 *output = malloc(cert_size);
180 if ((r = gnutls_x509_crt_export(x509_cert, GNUTLS_X509_FMT_DER, *output, &cert_size)) < 0) {
181 g_warning("couldn't export cert %s (%zd)\n", gnutls_strerror(r), cert_size);
189 size_t gnutls_i2d_PrivateKey(gnutls_x509_privkey pkey, unsigned char **output)
191 size_t key_size = 10*1024;
197 *output = malloc(key_size);
199 if ((r = gnutls_x509_privkey_export(pkey, GNUTLS_X509_FMT_DER, *output, &key_size)) < 0) {
200 g_warning("couldn't export key %s (%zd)\n", gnutls_strerror(r), key_size);
208 static gnutls_x509_crt gnutls_d2i_X509_fp(FILE *fp, int format)
210 gnutls_x509_crt cert = NULL;
214 if (fstat(fileno(fp), &s) < 0) {
218 tmp.data = malloc(s.st_size);
219 memset(tmp.data, 0, s.st_size);
220 tmp.size = s.st_size;
221 if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
227 gnutls_x509_crt_init(&cert);
228 if ((r = gnutls_x509_crt_import(cert, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM)) < 0) {
229 debug_print("cert import failed: %s\n", gnutls_strerror(r));
230 gnutls_x509_crt_deinit(cert);
234 debug_print("got cert! %p\n", cert);
238 static gnutls_x509_privkey gnutls_d2i_key_fp(FILE *fp, int format)
240 gnutls_x509_privkey key = NULL;
244 if (fstat(fileno(fp), &s) < 0) {
248 tmp.data = malloc(s.st_size);
249 memset(tmp.data, 0, s.st_size);
250 tmp.size = s.st_size;
251 if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
257 gnutls_x509_privkey_init(&key);
258 if ((r = gnutls_x509_privkey_import(key, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM)) < 0) {
259 debug_print("key import failed: %s\n", gnutls_strerror(r));
260 gnutls_x509_privkey_deinit(key);
264 debug_print("got key! %p\n", key);
268 static gnutls_pkcs12_t gnutls_d2i_PKCS12_fp(FILE *fp, int format)
270 gnutls_pkcs12_t p12 = NULL;
274 if (fstat(fileno(fp), &s) < 0) {
278 tmp.data = malloc(s.st_size);
279 memset(tmp.data, 0, s.st_size);
280 tmp.size = s.st_size;
281 if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
287 gnutls_pkcs12_init(&p12);
289 if ((r = gnutls_pkcs12_import(p12, &tmp, (format == 0)?GNUTLS_X509_FMT_DER:GNUTLS_X509_FMT_PEM,0)) < 0) {
290 g_warning("p12 import failed: %s\n", gnutls_strerror(r));
291 gnutls_pkcs12_deinit(p12);
295 debug_print("got p12! %p\n", p12);
301 static void ssl_certificate_save (SSLCertificate *cert)
306 file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
307 "certs", G_DIR_SEPARATOR_S, NULL);
309 if (!is_dir_exist(file))
313 port = g_strdup_printf("%d", cert->port);
314 file = get_certificate_path(cert->host, port, cert->fingerprint);
317 fp = g_fopen(file, "wb");
320 debug_print("Can't save certificate !\n");
324 gnutls_i2d_X509_fp(fp, cert->x509_cert);
326 i2d_X509_fp(fp, cert->x509_cert);
333 void ssl_certificate_destroy(SSLCertificate *cert)
339 gnutls_x509_crt_deinit(cert->x509_cert);
341 g_free(cert->fingerprint);
346 void ssl_certificate_delete_from_disk(SSLCertificate *cert)
350 buf = g_strdup_printf("%d", cert->port);
351 file = get_certificate_path(cert->host, buf, cert->fingerprint);
357 SSLCertificate *ssl_certificate_find (const gchar *host, gushort port, const gchar *fingerprint)
361 SSLCertificate *cert = NULL;
362 gnutls_x509_crt tmp_x509;
364 gboolean must_rename = FALSE;
366 buf = g_strdup_printf("%d", port);
368 if (fingerprint != NULL) {
369 file = get_certificate_path(host, buf, fingerprint);
370 fp = g_fopen(file, "rb");
373 /* see if we have the old one */
374 debug_print("didn't get %s\n", file);
376 file = get_certificate_path(host, buf, NULL);
377 fp = g_fopen(file, "rb");
380 debug_print("got %s\n", file);
381 must_rename = (fingerprint != NULL);
384 debug_print("got %s first try\n", file);
392 if ((tmp_x509 = gnutls_d2i_X509_fp(fp, 0)) != NULL) {
393 cert = ssl_certificate_new(tmp_x509, host, port);
394 debug_print("got cert %p\n", cert);
395 gnutls_x509_crt_deinit(tmp_x509);
401 gchar *old = get_certificate_path(host, buf, NULL);
402 gchar *new = get_certificate_path(host, buf, fingerprint);
403 if (strcmp(old, new))
404 move_file(old, new, TRUE);
413 static gboolean ssl_certificate_compare (SSLCertificate *cert_a, SSLCertificate *cert_b)
417 size_t cert_size_a = 0, cert_size_b = 0;
420 if (cert_a == NULL || cert_b == NULL)
423 if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_a))
424 != GNUTLS_E_SHORT_MEMORY_BUFFER) {
425 g_warning("couldn't gnutls_x509_crt_export to get size a %s\n", gnutls_strerror(r));
429 if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_b))
430 != GNUTLS_E_SHORT_MEMORY_BUFFER) {
431 g_warning("couldn't gnutls_x509_crt_export to get size b %s\n", gnutls_strerror(r));
435 output_a = g_malloc(cert_size_a);
436 output_b = g_malloc(cert_size_b);
437 if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, output_a, &cert_size_a)) < 0) {
438 g_warning("couldn't gnutls_x509_crt_export a %s\n", gnutls_strerror(r));
443 if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, output_b, &cert_size_b)) < 0) {
444 g_warning("couldn't gnutls_x509_crt_export b %s\n", gnutls_strerror(r));
449 if (cert_size_a != cert_size_b) {
450 g_warning("size differ %zd %zd\n", cert_size_a, cert_size_b);
455 if (memcmp(output_a, output_b, cert_size_a)) {
456 g_warning("contents differ\n");
467 static guint check_cert(gnutls_x509_crt cert)
469 gnutls_x509_crt *ca_list;
470 unsigned int max = 512;
471 unsigned int flags = 0;
478 if (claws_ssl_get_cert_file())
479 fp = g_fopen(claws_ssl_get_cert_file(), "r");
483 if (fstat(fileno(fp), &s) < 0) {
489 ca_list=(gnutls_x509_crt_t*)malloc(max*sizeof(gnutls_x509_crt_t));
490 tmp.data = malloc(s.st_size);
491 memset(tmp.data, 0, s.st_size);
492 tmp.size = s.st_size;
493 if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
501 if ((r = gnutls_x509_crt_list_import(ca_list, &max,
502 &tmp, GNUTLS_X509_FMT_PEM, flags)) < 0) {
503 debug_print("cert import failed: %s\n", gnutls_strerror(r));
510 debug_print("got %d certs in ca_list! %p\n", max, &ca_list);
511 r = gnutls_x509_crt_verify(cert, ca_list, max, flags, &status);
514 for (i = 0; i < max; i++)
515 gnutls_x509_crt_deinit(ca_list[i]);
525 char *ssl_certificate_check_signer (gnutls_x509_crt cert, guint status)
527 if (status == (guint)-1) {
528 status = check_cert(cert);
530 return g_strdup(_("Uncheckable"));
532 if (status & GNUTLS_CERT_INVALID) {
533 if (gnutls_x509_crt_check_issuer(cert, cert))
534 return g_strdup(_("Self-signed certificate"));
536 if (status & GNUTLS_CERT_REVOKED)
537 return g_strdup(_("Revoked certificate"));
538 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
539 return g_strdup(_("No certificate issuer found"));
540 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
541 return g_strdup(_("Certificate issuer is not a CA"));
547 gboolean ssl_certificate_check (gnutls_x509_crt x509_cert, guint status, const gchar *host, gushort port)
549 SSLCertificate *current_cert = NULL;
550 SSLCertificate *known_cert;
551 SSLCertHookData cert_hook_data;
554 unsigned char md[128];
556 current_cert = ssl_certificate_new(x509_cert, host, port);
558 if (current_cert == NULL) {
559 debug_print("Buggy certificate !\n");
563 current_cert->status = status;
566 gnutls_x509_crt_get_fingerprint(x509_cert, GNUTLS_DIG_MD5, md, &n);
567 fingerprint = readable_fingerprint(md, n);
569 known_cert = ssl_certificate_find(host, port, fingerprint);
573 if (known_cert == NULL) {
574 cert_hook_data.cert = current_cert;
575 cert_hook_data.old_cert = NULL;
576 cert_hook_data.expired = FALSE;
577 cert_hook_data.accept = FALSE;
579 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
581 if (!cert_hook_data.accept) {
582 ssl_certificate_destroy(current_cert);
585 ssl_certificate_save(current_cert);
586 ssl_certificate_destroy(current_cert);
589 } else if (!ssl_certificate_compare (current_cert, known_cert)) {
590 cert_hook_data.cert = current_cert;
591 cert_hook_data.old_cert = known_cert;
592 cert_hook_data.expired = FALSE;
593 cert_hook_data.accept = FALSE;
595 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
597 if (!cert_hook_data.accept) {
598 ssl_certificate_destroy(current_cert);
599 ssl_certificate_destroy(known_cert);
602 ssl_certificate_save(current_cert);
603 ssl_certificate_destroy(current_cert);
604 ssl_certificate_destroy(known_cert);
607 } else if (gnutls_x509_crt_get_expiration_time(current_cert->x509_cert) < time(NULL)) {
608 gchar *tmp = g_strdup_printf("%s:%d", current_cert->host, current_cert->port);
610 if (warned_expired == NULL)
611 warned_expired = g_hash_table_new(g_str_hash, g_str_equal);
613 if (g_hash_table_lookup(warned_expired, tmp)) {
615 ssl_certificate_destroy(current_cert);
616 ssl_certificate_destroy(known_cert);
620 cert_hook_data.cert = current_cert;
621 cert_hook_data.old_cert = NULL;
622 cert_hook_data.expired = TRUE;
623 cert_hook_data.accept = FALSE;
625 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
627 if (!cert_hook_data.accept) {
629 ssl_certificate_destroy(current_cert);
630 ssl_certificate_destroy(known_cert);
633 g_hash_table_insert(warned_expired, tmp, GINT_TO_POINTER(1));
634 ssl_certificate_destroy(current_cert);
635 ssl_certificate_destroy(known_cert);
640 ssl_certificate_destroy(current_cert);
641 ssl_certificate_destroy(known_cert);
645 gnutls_x509_crt ssl_certificate_get_x509_from_pem_file(const gchar *file)
647 gnutls_x509_crt x509 = NULL;
651 if (is_file_exist(file)) {
652 FILE *fp = g_fopen(file, "r");
654 x509 = gnutls_d2i_X509_fp(fp, 1);
659 log_error(LOG_PROTOCOL, _("Cannot open certificate file %s\n"), file);
664 gnutls_x509_privkey ssl_certificate_get_pkey_from_pem_file(const gchar *file)
666 gnutls_x509_privkey key = NULL;
670 if (is_file_exist(file)) {
671 FILE *fp = g_fopen(file, "r");
673 key = gnutls_d2i_key_fp(fp, 1);
678 log_error(LOG_PROTOCOL, _("Cannot open key file %s\n"), file);
683 /* From GnuTLS lib/gnutls_x509.c */
685 parse_pkcs12 (gnutls_pkcs12_t p12,
686 const char *password,
687 gnutls_x509_privkey * key,
688 gnutls_x509_crt_t * cert)
690 gnutls_pkcs12_bag_t bag = NULL;
699 ret = gnutls_pkcs12_bag_init (&bag);
706 ret = gnutls_pkcs12_get_bag (p12, index, bag);
707 if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
714 ret = gnutls_pkcs12_bag_get_type (bag, 0);
720 if (ret == GNUTLS_BAG_ENCRYPTED)
722 ret = gnutls_pkcs12_bag_decrypt (bag, password);
729 elements_in_bag = gnutls_pkcs12_bag_get_count (bag);
730 if (elements_in_bag < 0)
735 for (i = 0; i < elements_in_bag; i++)
740 type = gnutls_pkcs12_bag_get_type (bag, i);
746 ret = gnutls_pkcs12_bag_get_data (bag, i, &data);
754 case GNUTLS_BAG_PKCS8_ENCRYPTED_KEY:
755 case GNUTLS_BAG_PKCS8_KEY:
756 ret = gnutls_x509_privkey_init (key);
762 ret = gnutls_x509_privkey_import_pkcs8
763 (*key, &data, GNUTLS_X509_FMT_DER, password,
764 type == GNUTLS_BAG_PKCS8_KEY ? GNUTLS_PKCS_PLAIN : 0);
771 case GNUTLS_BAG_CERTIFICATE:
772 ret = gnutls_x509_crt_init (cert);
779 gnutls_x509_crt_import (*cert, &data, GNUTLS_X509_FMT_DER);
786 case GNUTLS_BAG_ENCRYPTED:
787 /* XXX Bother to recurse one level down? Unlikely to
788 use the same password anyway. */
789 case GNUTLS_BAG_EMPTY:
796 gnutls_pkcs12_bag_deinit (bag);
803 gnutls_pkcs12_bag_deinit (bag);
807 void ssl_certificate_get_x509_and_pkey_from_p12_file(const gchar *file, const gchar *password,
808 gnutls_x509_crt *x509, gnutls_x509_privkey *pkey)
810 gnutls_pkcs12_t p12 = NULL;
819 if (is_file_exist(file)) {
820 FILE *fp = g_fopen(file, "r");
822 p12 = gnutls_d2i_PKCS12_fp(fp, 0);
826 log_error(LOG_PROTOCOL, _("Cannot open certificate file %s\n"), file);
829 if ((r = parse_pkcs12(p12, password, pkey, x509)) == 0) {
830 debug_print("got p12\n");
832 log_error(LOG_PROTOCOL, "%s\n", gnutls_strerror(r));
834 gnutls_pkcs12_deinit(p12);
838 gboolean ssl_certificate_check_subject_cn(SSLCertificate *cert)
840 return gnutls_x509_crt_check_hostname(cert->x509_cert, cert->host) != 0;
843 gchar *ssl_certificate_get_subject_cn(SSLCertificate *cert)
845 gchar subject_cn[BUFFSIZE];
848 if(gnutls_x509_crt_get_dn_by_oid(cert->x509_cert,
849 GNUTLS_OID_X520_COMMON_NAME, 0, 0, subject_cn, &n))
850 strncpy(subject_cn, _("<not in certificate>"), BUFFSIZE);
852 return g_strdup(subject_cn);
855 #endif /* USE_GNUTLS */