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>
31 #include <sys/types.h>
38 #include <glib/gi18n.h>
43 #include "ssl_certificate.h"
50 static GHashTable *warned_expired = NULL;
52 gboolean prefs_common_unsafe_ssl_certs(void);
54 static gchar *get_certificate_path(const gchar *host, const gchar *port, const gchar *fp)
56 if (fp != NULL && prefs_common_unsafe_ssl_certs())
57 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
58 "certs", G_DIR_SEPARATOR_S,
59 host, ".", port, ".", fp, ".cert", NULL);
61 return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
62 "certs", G_DIR_SEPARATOR_S,
63 host, ".", port, ".cert", NULL);
67 static SSLCertificate *ssl_certificate_new_lookup(X509 *x509_cert, gchar *host, gushort port, gboolean lookup);
69 static SSLCertificate *ssl_certificate_new_lookup(gnutls_x509_crt x509_cert, gchar *host, gushort port, gboolean lookup);
73 time_t asn1toTime(ASN1_TIME *asn1Time)
78 if (asn1Time == NULL || asn1Time->length < 13)
81 memset(&tm, 0, sizeof(tm));
83 #define N2(n) ((asn1Time->data[n]-'0')*10 + asn1Time->data[(n)+1]-'0')
85 #define CPY(f,n) (tm.f=N2(n))
90 tm.tm_year += 100; /* Sux */
101 if (asn1Time->data[12] != 'Z')
103 if (asn1Time->length < 17)
106 offset=N2(13)*3600+N2(15)*60;
108 if (asn1Time->data[12] == '-')
115 return mktime(&tm)-offset;
119 static char * get_fqdn(char *host)
123 struct addrinfo hints, *res;
128 if (host == NULL || strlen(host) == 0)
131 memset(&hints, 0, sizeof(hints));
132 hints.ai_flags = AI_CANONNAME;
133 hints.ai_family = AF_UNSPEC;
134 hints.ai_socktype = SOCK_STREAM;
135 hints.ai_protocol = IPPROTO_TCP;
137 gai_err = getaddrinfo(host, NULL, &hints, &res);
139 g_warning("getaddrinfo for %s failed: %s\n",
140 host, gai_strerror(gai_err));
141 return g_strdup(host);
144 if (res->ai_canonname && strlen(res->ai_canonname)) {
145 gchar *fqdn = g_strdup(res->ai_canonname);
150 return g_strdup(host);
153 return g_strdup(host);
156 hp = my_gethostbyname(host);
158 return g_strdup(host); /*caller should free*/
160 return g_strdup(hp->h_name);
164 char * readable_fingerprint(unsigned char *src, int len)
175 tmp2 = g_strdup_printf("%s:%02X", ret, src[i]);
177 tmp2 = g_strdup_printf("%02X", src[i]);
179 ret = g_strdup(tmp2);
187 static gnutls_x509_crt x509_crt_copy(gnutls_x509_crt src)
192 gnutls_x509_crt dest;
194 if (gnutls_x509_crt_init(&dest) != 0) {
195 g_warning("couldn't gnutls_x509_crt_init\n");
199 if (gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, NULL, &size)
200 != GNUTLS_E_SHORT_MEMORY_BUFFER) {
201 g_warning("couldn't gnutls_x509_crt_export to get size\n");
202 gnutls_x509_crt_deinit(dest);
206 tmp.data = malloc(size);
207 memset(tmp.data, 0, size);
208 ret = gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, tmp.data, &size);
211 ret = gnutls_x509_crt_import(dest, &tmp, GNUTLS_X509_FMT_DER);
213 g_warning("couldn't gnutls_x509_crt_import for real (%d %s)\n", ret, gnutls_strerror(ret));
214 gnutls_x509_crt_deinit(dest);
218 g_warning("couldn't gnutls_x509_crt_export for real (%d %s)\n", ret, gnutls_strerror(ret));
219 gnutls_x509_crt_deinit(dest);
229 static SSLCertificate *ssl_certificate_new_lookup(X509 *x509_cert, gchar *host, gushort port, gboolean lookup)
231 static SSLCertificate *ssl_certificate_new_lookup(gnutls_x509_crt x509_cert, gchar *host, gushort port, gboolean lookup)
234 SSLCertificate *cert = g_new0(SSLCertificate, 1);
236 unsigned char md[128];
238 if (host == NULL || x509_cert == NULL) {
239 ssl_certificate_destroy(cert);
243 cert->x509_cert = X509_dup(x509_cert);
245 cert->x509_cert = x509_crt_copy(x509_cert);
246 cert->status = (guint)-1;
249 cert->host = get_fqdn(host);
251 cert->host = g_strdup(host);
256 X509_digest(cert->x509_cert, EVP_md5(), md, &n);
257 cert->fingerprint = readable_fingerprint(md, (int)n);
259 gnutls_x509_crt_get_fingerprint(cert->x509_cert, GNUTLS_DIG_MD5, md, &n);
260 cert->fingerprint = readable_fingerprint(md, (int)n);
266 static void i2d_X509_fp(FILE *fp, gnutls_x509_crt x509_cert)
268 char output[10*1024];
269 size_t cert_size = 10*1024;
272 if ((r = gnutls_x509_crt_export(x509_cert, GNUTLS_X509_FMT_DER, output, &cert_size)) < 0) {
273 g_warning("couldn't export cert %s (%d)\n", gnutls_strerror(r), cert_size);
276 debug_print("writing %zd bytes\n",cert_size);
277 if (fwrite(&output, 1, cert_size, fp) < cert_size) {
278 g_warning("failed to write cert\n");
281 static gnutls_x509_crt d2i_X509_fp(FILE *fp, int unused)
283 gnutls_x509_crt cert = NULL;
287 if (fstat(fileno(fp), &s) < 0) {
291 tmp.data = malloc(s.st_size);
292 memset(tmp.data, 0, s.st_size);
293 tmp.size = s.st_size;
294 if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
299 gnutls_x509_crt_init(&cert);
300 if ((r = gnutls_x509_crt_import(cert, &tmp, GNUTLS_X509_FMT_DER)) < 0) {
301 g_warning("import failed: %s\n", gnutls_strerror(r));
302 gnutls_x509_crt_deinit(cert);
305 debug_print("got cert! %p\n", cert);
310 static void ssl_certificate_save (SSLCertificate *cert)
315 file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
316 "certs", G_DIR_SEPARATOR_S, NULL);
318 if (!is_dir_exist(file))
322 port = g_strdup_printf("%d", cert->port);
323 file = get_certificate_path(cert->host, port, cert->fingerprint);
326 fp = g_fopen(file, "wb");
329 debug_print("Can't save certificate !\n");
332 i2d_X509_fp(fp, cert->x509_cert);
338 void ssl_certificate_destroy(SSLCertificate *cert)
345 X509_free(cert->x509_cert);
347 gnutls_x509_crt_deinit(cert->x509_cert);
350 g_free(cert->fingerprint);
355 void ssl_certificate_delete_from_disk(SSLCertificate *cert)
359 buf = g_strdup_printf("%d", cert->port);
360 file = get_certificate_path(cert->host, buf, cert->fingerprint);
366 SSLCertificate *ssl_certificate_find (gchar *host, gushort port, const gchar *fingerprint)
368 return ssl_certificate_find_lookup (host, port, fingerprint, TRUE);
371 SSLCertificate *ssl_certificate_find_lookup (gchar *host, gushort port, const gchar *fingerprint, gboolean lookup)
376 SSLCertificate *cert = NULL;
380 gnutls_x509_crt tmp_x509;
383 gboolean must_rename = FALSE;
386 fqdn_host = get_fqdn(host);
388 fqdn_host = g_strdup(host);
390 buf = g_strdup_printf("%d", port);
392 if (fingerprint != NULL) {
393 file = get_certificate_path(fqdn_host, buf, fingerprint);
394 fp = g_fopen(file, "rb");
397 /* see if we have the old one */
398 debug_print("didn't get %s\n", file);
400 file = get_certificate_path(fqdn_host, buf, NULL);
401 fp = g_fopen(file, "rb");
404 debug_print("got %s\n", file);
405 must_rename = (fingerprint != NULL);
408 debug_print("got %s first try\n", file);
417 if ((tmp_x509 = d2i_X509_fp(fp, 0)) != NULL) {
418 cert = ssl_certificate_new_lookup(tmp_x509, fqdn_host, port, lookup);
419 debug_print("got cert %p\n", cert);
423 gnutls_x509_crt_deinit(tmp_x509);
430 gchar *old = get_certificate_path(fqdn_host, buf, NULL);
431 gchar *new = get_certificate_path(fqdn_host, buf, fingerprint);
432 if (strcmp(old, new))
433 move_file(old, new, TRUE);
443 static gboolean ssl_certificate_compare (SSLCertificate *cert_a, SSLCertificate *cert_b)
446 if (cert_a == NULL || cert_b == NULL)
448 else if (!X509_cmp(cert_a->x509_cert, cert_b->x509_cert))
455 size_t cert_size_a = 0, cert_size_b = 0;
458 if (cert_a == NULL || cert_b == NULL)
461 if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_a))
462 != GNUTLS_E_SHORT_MEMORY_BUFFER) {
463 g_warning("couldn't gnutls_x509_crt_export to get size a %s\n", gnutls_strerror(r));
467 if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_b))
468 != GNUTLS_E_SHORT_MEMORY_BUFFER) {
469 g_warning("couldn't gnutls_x509_crt_export to get size b %s\n", gnutls_strerror(r));
473 output_a = malloc(cert_size_a);
474 output_b = malloc(cert_size_b);
475 if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, output_a, &cert_size_a)) < 0) {
476 g_warning("couldn't gnutls_x509_crt_export a %s\n", gnutls_strerror(r));
479 if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, output_b, &cert_size_b)) < 0) {
480 g_warning("couldn't gnutls_x509_crt_export b %s\n", gnutls_strerror(r));
483 if (cert_size_a != cert_size_b) {
484 g_warning("size differ %d %d\n", cert_size_a, cert_size_b);
487 if (memcmp(output_a, output_b, cert_size_a)) {
488 g_warning("contents differ\n");
497 char *ssl_certificate_check_signer (X509 *cert)
499 X509_STORE_CTX store_ctx;
501 char *err_msg = NULL;
503 store = X509_STORE_new();
505 g_print("Can't create X509_STORE\n");
508 if (!X509_STORE_set_default_paths(store)) {
509 X509_STORE_free (store);
510 return g_strdup(_("Couldn't load X509 default paths"));
513 X509_STORE_CTX_init (&store_ctx, store, cert, NULL);
515 if(!X509_verify_cert (&store_ctx)) {
516 err_msg = g_strdup(X509_verify_cert_error_string(
517 X509_STORE_CTX_get_error(&store_ctx)));
518 debug_print("Can't check signer: %s\n", err_msg);
519 X509_STORE_CTX_cleanup (&store_ctx);
520 X509_STORE_free (store);
524 X509_STORE_CTX_cleanup (&store_ctx);
525 X509_STORE_free (store);
529 char *ssl_certificate_check_signer (gnutls_x509_crt cert, guint status)
531 if (status == (guint)-1)
532 return g_strdup(_("Uncheckable"));
534 if (status & GNUTLS_CERT_INVALID) {
535 if (gnutls_x509_crt_check_issuer(cert, cert))
536 return g_strdup(_("Self-signed certificate"));
538 if (status & GNUTLS_CERT_REVOKED)
539 return g_strdup(_("Revoked certificate"));
540 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
541 return g_strdup(_("No certificate issuer found"));
542 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
543 return g_strdup(_("Certificate issuer is not a CA"));
551 gboolean ssl_certificate_check (X509 *x509_cert, gchar *fqdn, gchar *host, gushort port)
553 gboolean ssl_certificate_check (gnutls_x509_crt x509_cert, guint status, gchar *fqdn, gchar *host, gushort port)
556 SSLCertificate *current_cert = NULL;
557 SSLCertificate *known_cert;
558 SSLCertHookData cert_hook_data;
559 gchar *fqdn_host = NULL;
562 unsigned char md[128];
565 fqdn_host = g_strdup(fqdn);
567 fqdn_host = get_fqdn(host);
569 g_warning("no host!\n");
573 current_cert = ssl_certificate_new_lookup(x509_cert, fqdn_host, port, FALSE);
575 if (current_cert == NULL) {
576 debug_print("Buggy certificate !\n");
582 current_cert->status = status;
586 X509_digest(x509_cert, EVP_md5(), md, &n);
587 fingerprint = readable_fingerprint(md, (int)n);
590 gnutls_x509_crt_get_fingerprint(x509_cert, GNUTLS_DIG_MD5, md, &n);
591 fingerprint = readable_fingerprint(md, (int)n);
594 known_cert = ssl_certificate_find_lookup (fqdn_host, port, fingerprint, FALSE);
599 if (known_cert == NULL) {
600 cert_hook_data.cert = current_cert;
601 cert_hook_data.old_cert = NULL;
602 cert_hook_data.expired = FALSE;
603 cert_hook_data.accept = FALSE;
605 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
607 if (!cert_hook_data.accept) {
608 ssl_certificate_destroy(current_cert);
611 ssl_certificate_save(current_cert);
612 ssl_certificate_destroy(current_cert);
615 } else if (!ssl_certificate_compare (current_cert, known_cert)) {
616 cert_hook_data.cert = current_cert;
617 cert_hook_data.old_cert = known_cert;
618 cert_hook_data.expired = FALSE;
619 cert_hook_data.accept = FALSE;
621 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
623 if (!cert_hook_data.accept) {
624 ssl_certificate_destroy(current_cert);
625 ssl_certificate_destroy(known_cert);
628 ssl_certificate_save(current_cert);
629 ssl_certificate_destroy(current_cert);
630 ssl_certificate_destroy(known_cert);
634 } else if (asn1toTime(X509_get_notAfter(current_cert->x509_cert)) < time(NULL)) {
636 } else if (gnutls_x509_crt_get_expiration_time(current_cert->x509_cert) < time(NULL)) {
638 gchar *tmp = g_strdup_printf("%s:%d", current_cert->host, current_cert->port);
640 if (warned_expired == NULL)
641 warned_expired = g_hash_table_new(g_str_hash, g_str_equal);
643 if (g_hash_table_lookup(warned_expired, tmp)) {
645 ssl_certificate_destroy(current_cert);
646 ssl_certificate_destroy(known_cert);
650 cert_hook_data.cert = current_cert;
651 cert_hook_data.old_cert = NULL;
652 cert_hook_data.expired = TRUE;
653 cert_hook_data.accept = FALSE;
655 hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
657 if (!cert_hook_data.accept) {
659 ssl_certificate_destroy(current_cert);
660 ssl_certificate_destroy(known_cert);
663 g_hash_table_insert(warned_expired, tmp, GINT_TO_POINTER(1));
664 ssl_certificate_destroy(current_cert);
665 ssl_certificate_destroy(known_cert);
670 ssl_certificate_destroy(current_cert);
671 ssl_certificate_destroy(known_cert);
675 #endif /* USE_OPENSSL */