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
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/>.
25 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
27 #include <openssl/ssl.h>
29 #include <gnutls/gnutls.h>
30 #include <gnutls/x509.h>
35 #include <sys/types.h>
36 #include <sys/socket.h>
37 #include <netinet/in.h>
41 #include <glib/gi18n.h>
46 #include "ssl_certificate.h"
53 static GHashTable *warned_expired = NULL;
55 gboolean prefs_common_unsafe_ssl_certs(void);
57 static gchar *get_certificate_path(const gchar *host, const gchar *port, const gchar *fp)
59 if (fp != NULL && prefs_common_unsafe_ssl_certs())
60 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
61 "certs", G_DIR_SEPARATOR_S,
62 host, ".", port, ".", fp, ".cert", NULL);
64 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
65 "certs", G_DIR_SEPARATOR_S,
66 host, ".", port, ".cert", NULL);
70 static SSLCertificate *ssl_certificate_new_lookup(X509 *x509_cert, gchar *host, gushort port, gboolean lookup);
72 static SSLCertificate *ssl_certificate_new_lookup(gnutls_x509_crt x509_cert, gchar *host, gushort port, gboolean lookup);
76 time_t asn1toTime(ASN1_TIME *asn1Time)
81 if (asn1Time == NULL || asn1Time->length < 13)
84 memset(&tm, 0, sizeof(tm));
86 #define N2(n) ((asn1Time->data[n]-'0')*10 + asn1Time->data[(n)+1]-'0')
88 #define CPY(f,n) (tm.f=N2(n))
93 tm.tm_year += 100; /* Sux */
104 if (asn1Time->data[12] != 'Z')
106 if (asn1Time->length < 17)
109 offset=N2(13)*3600+N2(15)*60;
111 if (asn1Time->data[12] == '-')
118 return mktime(&tm)-offset;
122 static char * get_fqdn(char *host)
126 struct addrinfo hints, *res;
131 if (host == NULL || strlen(host) == 0)
134 memset(&hints, 0, sizeof(hints));
135 hints.ai_flags = AI_CANONNAME;
136 hints.ai_family = AF_UNSPEC;
137 hints.ai_socktype = SOCK_STREAM;
138 hints.ai_protocol = IPPROTO_TCP;
140 gai_err = getaddrinfo(host, NULL, &hints, &res);
142 g_warning("getaddrinfo for %s failed: %s\n",
143 host, gai_strerror(gai_err));
144 return g_strdup(host);
147 if (res->ai_canonname && strlen(res->ai_canonname)) {
148 gchar *fqdn = g_strdup(res->ai_canonname);
153 return g_strdup(host);
156 return g_strdup(host);
159 hp = my_gethostbyname(host);
161 return g_strdup(host); /*caller should free*/
163 return g_strdup(hp->h_name);
167 char * readable_fingerprint(unsigned char *src, int len)
178 tmp2 = g_strdup_printf("%s:%02X", ret, src[i]);
180 tmp2 = g_strdup_printf("%02X", src[i]);
182 ret = g_strdup(tmp2);
190 static gnutls_x509_crt x509_crt_copy(gnutls_x509_crt src)
195 gnutls_x509_crt dest;
197 if (gnutls_x509_crt_init(&dest) != 0) {
198 g_warning("couldn't gnutls_x509_crt_init\n");
202 if (gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, NULL, &size)
203 != GNUTLS_E_SHORT_MEMORY_BUFFER) {
204 g_warning("couldn't gnutls_x509_crt_export to get size\n");
205 gnutls_x509_crt_deinit(dest);
209 tmp.data = malloc(size);
210 memset(tmp.data, 0, size);
211 ret = gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, tmp.data, &size);
214 ret = gnutls_x509_crt_import(dest, &tmp, GNUTLS_X509_FMT_DER);
216 g_warning("couldn't gnutls_x509_crt_import for real (%d %s)\n", ret, gnutls_strerror(ret));
217 gnutls_x509_crt_deinit(dest);
221 g_warning("couldn't gnutls_x509_crt_export for real (%d %s)\n", ret, gnutls_strerror(ret));
222 gnutls_x509_crt_deinit(dest);
232 static SSLCertificate *ssl_certificate_new_lookup(X509 *x509_cert, gchar *host, gushort port, gboolean lookup)
234 static SSLCertificate *ssl_certificate_new_lookup(gnutls_x509_crt x509_cert, gchar *host, gushort port, gboolean lookup)
237 SSLCertificate *cert = g_new0(SSLCertificate, 1);
239 unsigned char md[128];
241 if (host == NULL || x509_cert == NULL) {
242 ssl_certificate_destroy(cert);
246 cert->x509_cert = X509_dup(x509_cert);
248 cert->x509_cert = x509_crt_copy(x509_cert);
249 cert->status = (guint)-1;
252 cert->host = get_fqdn(host);
254 cert->host = g_strdup(host);
259 X509_digest(cert->x509_cert, EVP_md5(), md, &n);
260 cert->fingerprint = readable_fingerprint(md, (int)n);
262 gnutls_x509_crt_get_fingerprint(cert->x509_cert, GNUTLS_DIG_MD5, md, &n);
263 cert->fingerprint = readable_fingerprint(md, (int)n);
269 static void i2d_X509_fp(FILE *fp, gnutls_x509_crt x509_cert)
271 char output[10*1024];
272 size_t cert_size = 10*1024;
275 if ((r = gnutls_x509_crt_export(x509_cert, GNUTLS_X509_FMT_DER, output, &cert_size)) < 0) {
276 g_warning("couldn't export cert %s (%d)\n", gnutls_strerror(r), cert_size);
279 debug_print("writing %zd bytes\n",cert_size);
280 if (fwrite(&output, 1, cert_size, fp) < cert_size) {
281 g_warning("failed to write cert\n");
284 static gnutls_x509_crt d2i_X509_fp(FILE *fp, int unused)
286 gnutls_x509_crt cert = NULL;
290 if (fstat(fileno(fp), &s) < 0) {
294 tmp.data = malloc(s.st_size);
295 memset(tmp.data, 0, s.st_size);
296 tmp.size = s.st_size;
297 if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
302 gnutls_x509_crt_init(&cert);
303 if ((r = gnutls_x509_crt_import(cert, &tmp, GNUTLS_X509_FMT_DER)) < 0) {
304 g_warning("import failed: %s\n", gnutls_strerror(r));
305 gnutls_x509_crt_deinit(cert);
308 debug_print("got cert! %p\n", cert);
313 static void ssl_certificate_save (SSLCertificate *cert)
318 file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
319 "certs", G_DIR_SEPARATOR_S, NULL);
321 if (!is_dir_exist(file))
325 port = g_strdup_printf("%d", cert->port);
326 file = get_certificate_path(cert->host, port, cert->fingerprint);
329 fp = g_fopen(file, "wb");
332 debug_print("Can't save certificate !\n");
335 i2d_X509_fp(fp, cert->x509_cert);
341 void ssl_certificate_destroy(SSLCertificate *cert)
348 X509_free(cert->x509_cert);
350 gnutls_x509_crt_deinit(cert->x509_cert);
353 g_free(cert->fingerprint);
358 void ssl_certificate_delete_from_disk(SSLCertificate *cert)
362 buf = g_strdup_printf("%d", cert->port);
363 file = get_certificate_path(cert->host, buf, cert->fingerprint);
369 SSLCertificate *ssl_certificate_find (gchar *host, gushort port, const gchar *fingerprint)
371 return ssl_certificate_find_lookup (host, port, fingerprint, TRUE);
374 SSLCertificate *ssl_certificate_find_lookup (gchar *host, gushort port, const gchar *fingerprint, gboolean lookup)
379 SSLCertificate *cert = NULL;
383 gnutls_x509_crt tmp_x509;
386 gboolean must_rename = FALSE;
389 fqdn_host = get_fqdn(host);
391 fqdn_host = g_strdup(host);
393 buf = g_strdup_printf("%d", port);
395 if (fingerprint != NULL) {
396 file = get_certificate_path(fqdn_host, buf, fingerprint);
397 fp = g_fopen(file, "rb");
400 /* see if we have the old one */
401 debug_print("didn't get %s\n", file);
403 file = get_certificate_path(fqdn_host, buf, NULL);
404 fp = g_fopen(file, "rb");
407 debug_print("got %s\n", file);
408 must_rename = (fingerprint != NULL);
411 debug_print("got %s first try\n", file);
420 if ((tmp_x509 = d2i_X509_fp(fp, 0)) != NULL) {
421 cert = ssl_certificate_new_lookup(tmp_x509, fqdn_host, port, lookup);
422 debug_print("got cert %p\n", cert);
426 gnutls_x509_crt_deinit(tmp_x509);
433 gchar *old = get_certificate_path(fqdn_host, buf, NULL);
434 gchar *new = get_certificate_path(fqdn_host, buf, fingerprint);
435 if (strcmp(old, new))
436 move_file(old, new, TRUE);
446 static gboolean ssl_certificate_compare (SSLCertificate *cert_a, SSLCertificate *cert_b)
449 if (cert_a == NULL || cert_b == NULL)
451 else if (!X509_cmp(cert_a->x509_cert, cert_b->x509_cert))
458 size_t cert_size_a = 0, cert_size_b = 0;
461 if (cert_a == NULL || cert_b == NULL)
464 if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_a))
465 != GNUTLS_E_SHORT_MEMORY_BUFFER) {
466 g_warning("couldn't gnutls_x509_crt_export to get size a %s\n", gnutls_strerror(r));
470 if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_b))
471 != GNUTLS_E_SHORT_MEMORY_BUFFER) {
472 g_warning("couldn't gnutls_x509_crt_export to get size b %s\n", gnutls_strerror(r));
476 output_a = malloc(cert_size_a);
477 output_b = malloc(cert_size_b);
478 if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, output_a, &cert_size_a)) < 0) {
479 g_warning("couldn't gnutls_x509_crt_export a %s\n", gnutls_strerror(r));
482 if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, output_b, &cert_size_b)) < 0) {
483 g_warning("couldn't gnutls_x509_crt_export b %s\n", gnutls_strerror(r));
486 if (cert_size_a != cert_size_b) {
487 g_warning("size differ %d %d\n", cert_size_a, cert_size_b);
490 if (memcmp(output_a, output_b, cert_size_a)) {
491 g_warning("contents differ\n");
500 char *ssl_certificate_check_signer (X509 *cert)
502 X509_STORE_CTX store_ctx;
504 char *err_msg = NULL;
506 store = X509_STORE_new();
508 g_print("Can't create X509_STORE\n");
511 if (!X509_STORE_set_default_paths(store)) {
512 X509_STORE_free (store);
513 return g_strdup(_("Couldn't load X509 default paths"));
516 X509_STORE_CTX_init (&store_ctx, store, cert, NULL);
518 if(!X509_verify_cert (&store_ctx)) {
519 err_msg = g_strdup(X509_verify_cert_error_string(
520 X509_STORE_CTX_get_error(&store_ctx)));
521 debug_print("Can't check signer: %s\n", err_msg);
522 X509_STORE_CTX_cleanup (&store_ctx);
523 X509_STORE_free (store);
527 X509_STORE_CTX_cleanup (&store_ctx);
528 X509_STORE_free (store);
532 char *ssl_certificate_check_signer (gnutls_x509_crt cert, guint status)
534 if (status == (guint)-1)
535 return g_strdup(_("Uncheckable"));
537 if (status & GNUTLS_CERT_INVALID) {
538 if (gnutls_x509_crt_check_issuer(cert, cert))
539 return g_strdup(_("Self-signed certificate"));
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"));
554 gboolean ssl_certificate_check (X509 *x509_cert, gchar *fqdn, gchar *host, gushort port)
556 gboolean ssl_certificate_check (gnutls_x509_crt x509_cert, guint status, gchar *fqdn, gchar *host, gushort port)
559 SSLCertificate *current_cert = NULL;
560 SSLCertificate *known_cert;
561 SSLCertHookData cert_hook_data;
562 gchar *fqdn_host = NULL;
565 unsigned char md[128];
568 fqdn_host = g_strdup(fqdn);
570 fqdn_host = get_fqdn(host);
572 g_warning("no host!\n");
576 current_cert = ssl_certificate_new_lookup(x509_cert, fqdn_host, port, FALSE);
578 if (current_cert == NULL) {
579 debug_print("Buggy certificate !\n");
585 current_cert->status = status;
589 X509_digest(x509_cert, EVP_md5(), md, &n);
590 fingerprint = readable_fingerprint(md, (int)n);
593 gnutls_x509_crt_get_fingerprint(x509_cert, GNUTLS_DIG_MD5, md, &n);
594 fingerprint = readable_fingerprint(md, (int)n);
597 known_cert = ssl_certificate_find_lookup (fqdn_host, port, fingerprint, FALSE);
602 if (known_cert == NULL) {
603 cert_hook_data.cert = current_cert;
604 cert_hook_data.old_cert = NULL;
605 cert_hook_data.expired = FALSE;
606 cert_hook_data.accept = FALSE;
608 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
610 if (!cert_hook_data.accept) {
611 ssl_certificate_destroy(current_cert);
614 ssl_certificate_save(current_cert);
615 ssl_certificate_destroy(current_cert);
618 } else if (!ssl_certificate_compare (current_cert, known_cert)) {
619 cert_hook_data.cert = current_cert;
620 cert_hook_data.old_cert = known_cert;
621 cert_hook_data.expired = FALSE;
622 cert_hook_data.accept = FALSE;
624 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
626 if (!cert_hook_data.accept) {
627 ssl_certificate_destroy(current_cert);
628 ssl_certificate_destroy(known_cert);
631 ssl_certificate_save(current_cert);
632 ssl_certificate_destroy(current_cert);
633 ssl_certificate_destroy(known_cert);
637 } else if (asn1toTime(X509_get_notAfter(current_cert->x509_cert)) < time(NULL)) {
639 } else if (gnutls_x509_crt_get_expiration_time(current_cert->x509_cert) < time(NULL)) {
641 gchar *tmp = g_strdup_printf("%s:%d", current_cert->host, current_cert->port);
643 if (warned_expired == NULL)
644 warned_expired = g_hash_table_new(g_str_hash, g_str_equal);
646 if (g_hash_table_lookup(warned_expired, tmp)) {
648 ssl_certificate_destroy(current_cert);
649 ssl_certificate_destroy(known_cert);
653 cert_hook_data.cert = current_cert;
654 cert_hook_data.old_cert = NULL;
655 cert_hook_data.expired = TRUE;
656 cert_hook_data.accept = FALSE;
658 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
660 if (!cert_hook_data.accept) {
662 ssl_certificate_destroy(current_cert);
663 ssl_certificate_destroy(known_cert);
666 g_hash_table_insert(warned_expired, tmp, GINT_TO_POINTER(1));
667 ssl_certificate_destroy(current_cert);
668 ssl_certificate_destroy(known_cert);
673 ssl_certificate_destroy(current_cert);
674 ssl_certificate_destroy(known_cert);
678 #endif /* USE_OPENSSL */