2 * empathy-tls-verifier.c - Source for EmpathyTLSVerifier
3 * Copyright (C) 2010 Collabora Ltd.
4 * @author Cosimo Cecchi <cosimo.cecchi@collabora.co.uk>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #include <gnutls/gnutls.h>
24 #include <gnutls/x509.h>
26 #include <telepathy-glib/util.h>
28 #include "empathy-tls-verifier.h"
30 #define DEBUG_FLAG EMPATHY_DEBUG_TLS
31 #include "empathy-debug.h"
32 #include "empathy-utils.h"
34 G_DEFINE_TYPE (EmpathyTLSVerifier, empathy_tls_verifier,
37 #define GET_PRIV(obj) EMPATHY_GET_PRIV (obj, EmpathyTLSVerifier);
40 PROP_TLS_CERTIFICATE = 1,
46 static const gchar* system_ca_paths[] = {
47 "/etc/ssl/certs/ca-certificates.crt",
52 GPtrArray *cert_chain;
54 GPtrArray *trusted_ca_list;
55 GPtrArray *trusted_crl_list;
57 EmpathyTLSCertificate *certificate;
60 GSimpleAsyncResult *verify_result;
63 } EmpathyTLSVerifierPriv;
65 static gnutls_x509_crt_t *
66 ptr_array_to_x509_crt_list (GPtrArray *chain)
68 gnutls_x509_crt_t *retval;
71 retval = g_malloc0 (sizeof (gnutls_x509_crt_t) * chain->len);
73 for (idx = 0; idx < (gint) chain->len; idx++)
74 retval[idx] = g_ptr_array_index (chain, idx);
80 verification_output_to_reason (gint res,
82 EmpTLSCertificateRejectReason *reason)
84 gboolean retval = TRUE;
86 if (res != GNUTLS_E_SUCCESS)
90 /* the certificate is not structurally valid */
93 case GNUTLS_E_INSUFFICIENT_CREDENTIALS:
94 *reason = EMP_TLS_CERTIFICATE_REJECT_REASON_UNTRUSTED;
96 case GNUTLS_E_CONSTRAINT_ERROR:
97 *reason = EMP_TLS_CERTIFICATE_REJECT_REASON_LIMIT_EXCEEDED;
100 *reason = EMP_TLS_CERTIFICATE_REJECT_REASON_UNKNOWN;
107 /* the certificate is structurally valid, check for other errors. */
108 if (verify_output & GNUTLS_CERT_INVALID)
112 if (verify_output & GNUTLS_CERT_SIGNER_NOT_FOUND)
113 *reason = EMP_TLS_CERTIFICATE_REJECT_REASON_UNTRUSTED;
114 else if (verify_output & GNUTLS_CERT_SIGNER_NOT_CA)
115 *reason = EMP_TLS_CERTIFICATE_REJECT_REASON_SELF_SIGNED;
116 else if (verify_output & GNUTLS_CERT_INSECURE_ALGORITHM)
117 *reason = EMP_TLS_CERTIFICATE_REJECT_REASON_INSECURE;
118 else if (verify_output & GNUTLS_CERT_NOT_ACTIVATED)
119 *reason = EMP_TLS_CERTIFICATE_REJECT_REASON_NOT_ACTIVATED;
120 else if (verify_output & GNUTLS_CERT_EXPIRED)
121 *reason = EMP_TLS_CERTIFICATE_REJECT_REASON_EXPIRED;
123 *reason = EMP_TLS_CERTIFICATE_REJECT_REASON_UNKNOWN;
133 verify_last_certificate (EmpathyTLSVerifier *self,
134 gnutls_x509_crt_t cert,
135 EmpTLSCertificateRejectReason *reason)
139 gnutls_x509_crt_t *trusted_ca_list;
140 EmpathyTLSVerifierPriv *priv = GET_PRIV (self);
142 trusted_ca_list = ptr_array_to_x509_crt_list (priv->trusted_ca_list);
143 res = gnutls_x509_crt_verify (cert, trusted_ca_list,
144 priv->trusted_ca_list->len, 0, &verify_output);
146 g_free (trusted_ca_list);
148 return verification_output_to_reason (res, verify_output, reason);
152 verify_certificate (EmpathyTLSVerifier *self,
153 gnutls_x509_crt_t cert,
154 gnutls_x509_crt_t issuer,
155 EmpTLSCertificateRejectReason *reason)
160 res = gnutls_x509_crt_verify (cert, &issuer, 1, 0, &verify_output);
162 return verification_output_to_reason (res, verify_output, reason);
166 complete_verification (EmpathyTLSVerifier *self)
168 EmpathyTLSVerifierPriv *priv = GET_PRIV (self);
170 DEBUG ("Verification successful, completing...");
172 g_simple_async_result_complete_in_idle (priv->verify_result);
174 tp_clear_object (&priv->verify_result);
178 abort_verification (EmpathyTLSVerifier *self,
179 EmpTLSCertificateRejectReason reason)
181 EmpathyTLSVerifierPriv *priv = GET_PRIV (self);
183 DEBUG ("Verification error %u, aborting...", reason);
185 g_simple_async_result_set_error (priv->verify_result,
186 G_IO_ERROR, reason, "TLS verification failed with reason %u",
188 g_simple_async_result_complete_in_idle (priv->verify_result);
190 tp_clear_object (&priv->verify_result);
194 real_start_verification (EmpathyTLSVerifier *self)
196 gnutls_x509_crt_t last_cert;
198 gboolean res = FALSE;
200 EmpTLSCertificateRejectReason reason =
201 EMP_TLS_CERTIFICATE_REJECT_REASON_UNKNOWN;
202 EmpathyTLSVerifierPriv *priv = GET_PRIV (self);
204 num_certs = priv->cert_chain->len;
206 DEBUG ("Starting verification");
208 if (priv->trusted_ca_list->len > 0)
210 /* if the last certificate is self-signed, ignore it, as we want to check
211 * the chain against our trusted CA list first.
213 last_cert = g_ptr_array_index (priv->cert_chain, num_certs - 1);
215 if (gnutls_x509_crt_check_issuer (last_cert, last_cert) > 0)
219 for (idx = 1; idx < num_certs; idx++)
221 res = verify_certificate (self,
222 g_ptr_array_index (priv->cert_chain, idx -1),
223 g_ptr_array_index (priv->cert_chain, idx),
226 DEBUG ("Certificate verification %d gave result %d with reason %u", idx,
231 abort_verification (self, reason);
236 if (priv->trusted_ca_list->len > 0)
238 res = verify_last_certificate (self,
239 g_ptr_array_index (priv->cert_chain, num_certs - 1),
245 abort_verification (self, reason);
249 complete_verification (self);
253 start_verification (gpointer user_data)
255 EmpathyTLSVerifier *self = user_data;
257 real_start_verification (self);
263 build_gnutls_cert_list (EmpathyTLSVerifier *self)
267 GPtrArray *certificate_data = NULL;
268 EmpathyTLSVerifierPriv *priv = GET_PRIV (self);
270 g_object_get (priv->certificate,
271 "cert-data", &certificate_data,
273 num_certs = certificate_data->len;
275 priv->cert_chain = g_ptr_array_sized_new (num_certs);
277 for (idx = 0; idx < num_certs; idx++)
279 gnutls_x509_crt_t cert;
281 gnutls_datum_t datum = { NULL, 0 };
283 one_cert = g_ptr_array_index (certificate_data, idx);
284 datum.data = (guchar *) one_cert->data;
285 datum.size = one_cert->len;
287 gnutls_x509_crt_init (&cert);
288 gnutls_x509_crt_import (cert, &datum, GNUTLS_X509_FMT_DER);
290 g_ptr_array_add (priv->cert_chain, cert);
295 get_number_and_type_of_certificates (gnutls_datum_t *datum,
296 gnutls_x509_crt_fmt_t *format)
298 gnutls_x509_crt_t fake;
302 res = gnutls_x509_crt_list_import (&fake, (guint *) &retval, datum,
303 GNUTLS_X509_FMT_PEM, 0);
305 if (res == GNUTLS_E_SHORT_MEMORY_BUFFER || res > 0)
307 *format = GNUTLS_X509_FMT_PEM;
312 res = gnutls_x509_crt_list_import (&fake, (guint *) &retval, datum,
313 GNUTLS_X509_FMT_DER, 0);
317 *format = GNUTLS_X509_FMT_DER;
325 build_gnutls_ca_and_crl_lists (GIOSchedulerJob *job,
326 GCancellable *cancellable,
330 EmpathyTLSVerifier *self = user_data;
331 EmpathyTLSVerifierPriv *priv = GET_PRIV (self);
333 priv->trusted_ca_list = g_ptr_array_new ();
335 for (idx = 0; idx < (gint) G_N_ELEMENTS (system_ca_paths) - 1; idx++)
338 gchar *contents = NULL;
341 gnutls_x509_crt_t *cert_list;
342 gnutls_datum_t datum = { NULL, 0 };
343 gnutls_x509_crt_fmt_t format = 0;
344 GError *error = NULL;
346 path = system_ca_paths[idx];
347 g_file_get_contents (path, &contents, &length, &error);
351 DEBUG ("Unable to read system CAs from path %s", path);
352 g_error_free (error);
356 datum.data = (guchar *) contents;
358 n_certs = get_number_and_type_of_certificates (&datum, &format);
362 DEBUG ("Unable to parse the system CAs from path %s: GnuTLS "
363 "returned error %d", path, n_certs);
369 cert_list = g_malloc0 (sizeof (gnutls_x509_crt_t) * n_certs);
370 res = gnutls_x509_crt_list_import (cert_list, (guint *) &n_certs, &datum,
375 DEBUG ("Unable to import system CAs from path %s; "
376 "GnuTLS returned error %d", path, res);
382 DEBUG ("Successfully imported %d system CA certificates from path %s",
385 /* append the newly created cert structutes into the global GPtrArray */
386 for (idx = 0; idx < n_certs; idx++)
387 g_ptr_array_add (priv->trusted_ca_list, cert_list[idx]);
392 /* TODO: do the CRL too */
394 g_io_scheduler_job_send_to_mainloop_async (job,
395 start_verification, self, NULL);
401 empathy_tls_verifier_get_property (GObject *object,
406 EmpathyTLSVerifierPriv *priv = GET_PRIV (object);
410 case PROP_TLS_CERTIFICATE:
411 g_value_set_object (value, priv->certificate);
414 g_value_set_string (value, priv->hostname);
417 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
423 empathy_tls_verifier_set_property (GObject *object,
428 EmpathyTLSVerifierPriv *priv = GET_PRIV (object);
432 case PROP_TLS_CERTIFICATE:
433 priv->certificate = g_value_dup_object (value);
436 priv->hostname = g_value_dup_string (value);
439 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
445 empathy_tls_verifier_dispose (GObject *object)
447 EmpathyTLSVerifierPriv *priv = GET_PRIV (object);
449 if (priv->dispose_run)
452 priv->dispose_run = TRUE;
454 tp_clear_object (&priv->certificate);
456 G_OBJECT_CLASS (empathy_tls_verifier_parent_class)->dispose (object);
460 empathy_tls_verifier_finalize (GObject *object)
462 EmpathyTLSVerifierPriv *priv = GET_PRIV (object);
464 DEBUG ("%p", object);
466 g_free (priv->hostname);
468 G_OBJECT_CLASS (empathy_tls_verifier_parent_class)->finalize (object);
472 empathy_tls_verifier_constructed (GObject *object)
474 EmpathyTLSVerifier *self = EMPATHY_TLS_VERIFIER (object);
476 build_gnutls_cert_list (self);
478 if (G_OBJECT_CLASS (empathy_tls_verifier_parent_class)->constructed != NULL)
479 G_OBJECT_CLASS (empathy_tls_verifier_parent_class)->constructed (object);
483 empathy_tls_verifier_init (EmpathyTLSVerifier *self)
485 self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
486 EMPATHY_TYPE_TLS_VERIFIER, EmpathyTLSVerifierPriv);
490 empathy_tls_verifier_class_init (EmpathyTLSVerifierClass *klass)
493 GObjectClass *oclass = G_OBJECT_CLASS (klass);
495 g_type_class_add_private (klass, sizeof (EmpathyTLSVerifierPriv));
497 oclass->set_property = empathy_tls_verifier_set_property;
498 oclass->get_property = empathy_tls_verifier_get_property;
499 oclass->finalize = empathy_tls_verifier_finalize;
500 oclass->dispose = empathy_tls_verifier_dispose;
501 oclass->constructed = empathy_tls_verifier_constructed;
503 pspec = g_param_spec_object ("certificate", "The EmpathyTLSCertificate",
504 "The EmpathyTLSCertificate to be verified.",
505 EMPATHY_TYPE_TLS_CERTIFICATE,
506 G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
507 g_object_class_install_property (oclass, PROP_TLS_CERTIFICATE, pspec);
509 pspec = g_param_spec_string ("hostname", "The hostname",
510 "The hostname which should be certified by the certificate.",
512 G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
513 g_object_class_install_property (oclass, PROP_HOSTNAME, pspec);
517 empathy_tls_verifier_new (EmpathyTLSCertificate *certificate,
518 const gchar *hostname)
520 g_assert (EMPATHY_IS_TLS_CERTIFICATE (certificate));
521 g_assert (hostname != NULL);
523 return g_object_new (EMPATHY_TYPE_TLS_VERIFIER,
524 "certificate", certificate,
525 "hostname", hostname,
530 empathy_tls_verifier_verify_async (EmpathyTLSVerifier *self,
531 GAsyncReadyCallback callback,
534 EmpathyTLSVerifierPriv *priv = GET_PRIV (self);
536 priv->verify_result = g_simple_async_result_new (G_OBJECT (self),
537 callback, user_data, NULL);
539 g_io_scheduler_push_job (build_gnutls_ca_and_crl_lists,
540 self, NULL, G_PRIORITY_DEFAULT, NULL);
544 empathy_tls_verifier_verify_finish (EmpathyTLSVerifier *self,
546 EmpTLSCertificateRejectReason *reason,
549 if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res),
552 *reason = (*error)->code;
556 *reason = EMP_TLS_CERTIFICATE_REJECT_REASON_UNKNOWN;