tls/gnutls/gtlscertificate-gnutls.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright © 2009 Red Hat, Inc
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "config.h"
  22
  23 #include <gnutls/gnutls.h>
  24 #include <gnutls/x509.h>
  25 #include <string.h>
  26
  27 #include "gtlscertificate-gnutls.h"
  28 #include <glib/gi18n-lib.h>
  29
  30 static void     g_tls_certificate_gnutls_initable_iface_init (GInitableIface  *iface);
  31
  32 G_DEFINE_TYPE_WITH_CODE (GTlsCertificateGnutls, g_tls_certificate_gnutls, G_TYPE_TLS_CERTIFICATE,
  33                          G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
  34                                                 g_tls_certificate_gnutls_initable_iface_init);)
  35
  36 enum
  37 {
  38   PROP_0,
  39
  40   PROP_CERTIFICATE,
  41   PROP_CERTIFICATE_PEM,
  42   PROP_PRIVATE_KEY,
  43   PROP_PRIVATE_KEY_PEM,
  44   PROP_ISSUER
  45 };
  46
  47 struct _GTlsCertificateGnutlsPrivate
  48 {
  49   gnutls_x509_crt_t cert;
  50   gnutls_x509_privkey_t key;
  51
  52   GTlsCertificateGnutls *issuer;
  53
  54   GError *construct_error;
  55
  56   guint have_cert : 1;
  57   guint have_key  : 1;
  58 };
  59
  60 static void
  61 g_tls_certificate_gnutls_finalize (GObject *object)
  62 {
  63   GTlsCertificateGnutls *gnutls = G_TLS_CERTIFICATE_GNUTLS (object);
  64
  65   gnutls_x509_crt_deinit (gnutls->priv->cert);
  66   gnutls_x509_privkey_deinit (gnutls->priv->key);
  67
  68   if (gnutls->priv->issuer)
  69     g_object_unref (gnutls->priv->issuer);
  70
  71   g_clear_error (&gnutls->priv->construct_error);
  72
  73   G_OBJECT_CLASS (g_tls_certificate_gnutls_parent_class)->finalize (object);
  74 }
  75
  76 static void
  77 g_tls_certificate_gnutls_get_property (GObject    *object,
  78                                        guint       prop_id,
  79                                        GValue     *value,
  80                                        GParamSpec *pspec)
  81 {
  82   GTlsCertificateGnutls *gnutls = G_TLS_CERTIFICATE_GNUTLS (object);
  83   GByteArray *certificate;
  84   char *certificate_pem;
  85   int status;
  86   size_t size;
  87
  88   switch (prop_id)
  89     {
  90     case PROP_CERTIFICATE:
  91       size = 0;
  92       status = gnutls_x509_crt_export (gnutls->priv->cert,
  93                                        GNUTLS_X509_FMT_DER,
  94                                        NULL, &size);
  95       if (status != GNUTLS_E_SHORT_MEMORY_BUFFER)
  96         certificate = NULL;
  97       else
  98         {
  99           certificate = g_byte_array_sized_new (size);
 100           certificate->len = size;
 101           status = gnutls_x509_crt_export (gnutls->priv->cert,
 102                                            GNUTLS_X509_FMT_DER,
 103                                            certificate->data, &size);
 104           if (status != 0)
 105             {
 106               g_byte_array_free (certificate, TRUE);
 107               certificate = NULL;
 108             }
 109         }
 110       g_value_take_boxed (value, certificate);
 111       break;
 112
 113     case PROP_CERTIFICATE_PEM:
 114       size = 0;
 115       status = gnutls_x509_crt_export (gnutls->priv->cert,
 116                                        GNUTLS_X509_FMT_PEM,
 117                                        NULL, &size);
 118       if (status != GNUTLS_E_SHORT_MEMORY_BUFFER)
 119         certificate_pem = NULL;
 120       else
 121         {
 122           certificate_pem = g_malloc (size);
 123           status = gnutls_x509_crt_export (gnutls->priv->cert,
 124                                            GNUTLS_X509_FMT_PEM,
 125                                            certificate_pem, &size);
 126           if (status != 0)
 127             {
 128               g_free (certificate_pem);
 129               certificate_pem = NULL;
 130             }
 131         }
 132       g_value_take_string (value, certificate_pem);
 133       break;
 134
 135     case PROP_ISSUER:
 136       g_value_set_object (value, gnutls->priv->issuer);
 137       break;
 138
 139     default:
 140       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 141     }
 142 }
 143
 144 static void
 145 g_tls_certificate_gnutls_set_property (GObject      *object,
 146                                        guint         prop_id,
 147                                        const GValue *value,
 148                                        GParamSpec   *pspec)
 149 {
 150   GTlsCertificateGnutls *gnutls = G_TLS_CERTIFICATE_GNUTLS (object);
 151   GByteArray *bytes;
 152   const char *string;
 153   gnutls_datum_t data;
 154   int status;
 155
 156   switch (prop_id)
 157     {
 158     case PROP_CERTIFICATE:
 159       bytes = g_value_get_boxed (value);
 160       if (!bytes)
 161         break;
 162       g_return_if_fail (gnutls->priv->have_cert == FALSE);
 163       data.data = bytes->data;
 164       data.size = bytes->len;
 165       status = gnutls_x509_crt_import (gnutls->priv->cert, &data,
 166                                        GNUTLS_X509_FMT_DER);
 167       if (status == 0)
 168         gnutls->priv->have_cert = TRUE;
 169       else if (!gnutls->priv->construct_error)
 170         {
 171           gnutls->priv->construct_error =
 172             g_error_new (G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
 173                          _("Could not parse DER certificate: %s"),
 174                          gnutls_strerror (status));
 175         }
 176
 177       break;
 178
 179     case PROP_CERTIFICATE_PEM:
 180       string = g_value_get_string (value);
 181       if (!string)
 182         break;
 183       g_return_if_fail (gnutls->priv->have_cert == FALSE);
 184       data.data = (void *)string;
 185       data.size = strlen (string);
 186       status = gnutls_x509_crt_import (gnutls->priv->cert, &data,
 187                                        GNUTLS_X509_FMT_PEM);
 188       if (status == 0)
 189         gnutls->priv->have_cert = TRUE;
 190       else if (!gnutls->priv->construct_error)
 191         {
 192           gnutls->priv->construct_error =
 193             g_error_new (G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
 194                          _("Could not parse PEM certificate: %s"),
 195                          gnutls_strerror (status));
 196         }
 197       break;
 198
 199     case PROP_PRIVATE_KEY:
 200       bytes = g_value_get_boxed (value);
 201       if (!bytes)
 202         break;
 203       g_return_if_fail (gnutls->priv->have_key == FALSE);
 204       data.data = bytes->data;
 205       data.size = bytes->len;
 206       status = gnutls_x509_privkey_import (gnutls->priv->key, &data,
 207                                            GNUTLS_X509_FMT_DER);
 208       if (status == 0)
 209         gnutls->priv->have_key = TRUE;
 210       else if (!gnutls->priv->construct_error)
 211         {
 212           gnutls->priv->construct_error =
 213             g_error_new (G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
 214                          _("Could not parse DER private key: %s"),
 215                          gnutls_strerror (status));
 216         }
 217       break;
 218
 219     case PROP_PRIVATE_KEY_PEM:
 220       string = g_value_get_string (value);
 221       if (!string)
 222         break;
 223       g_return_if_fail (gnutls->priv->have_key == FALSE);
 224       data.data = (void *)string;
 225       data.size = strlen (string);
 226       status = gnutls_x509_privkey_import (gnutls->priv->key, &data,
 227                                            GNUTLS_X509_FMT_PEM);
 228       if (status == 0)
 229         gnutls->priv->have_key = TRUE;
 230       else if (!gnutls->priv->construct_error)
 231         {
 232           gnutls->priv->construct_error =
 233             g_error_new (G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
 234                          _("Could not parse PEM private key: %s"),
 235                          gnutls_strerror (status));
 236         }
 237       break;
 238
 239     case PROP_ISSUER:
 240       gnutls->priv->issuer = g_value_dup_object (value);
 241       break;
 242
 243     default:
 244       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 245     }
 246 }
 247
 248 static void
 249 g_tls_certificate_gnutls_init (GTlsCertificateGnutls *gnutls)
 250 {
 251   gnutls->priv = G_TYPE_INSTANCE_GET_PRIVATE (gnutls,
 252                                               G_TYPE_TLS_CERTIFICATE_GNUTLS,
 253                                               GTlsCertificateGnutlsPrivate);
 254
 255   gnutls_x509_crt_init (&gnutls->priv->cert);
 256   gnutls_x509_privkey_init (&gnutls->priv->key);
 257 }
 258
 259 static gboolean
 260 g_tls_certificate_gnutls_initable_init (GInitable       *initable,
 261                                         GCancellable    *cancellable,
 262                                         GError         **error)
 263 {
 264   GTlsCertificateGnutls *gnutls = G_TLS_CERTIFICATE_GNUTLS (initable);
 265
 266   if (gnutls->priv->construct_error)
 267     {
 268       g_propagate_error (error, gnutls->priv->construct_error);
 269       gnutls->priv->construct_error = NULL;
 270       return FALSE;
 271     }
 272   else if (!gnutls->priv->have_cert)
 273     {
 274       g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
 275                            _("No certificate data provided"));
 276       return FALSE;
 277     }
 278   else
 279     return TRUE;
 280 }
 281
 282 static GTlsCertificateFlags
 283 g_tls_certificate_gnutls_verify (GTlsCertificate     *cert,
 284                                  GSocketConnectable  *identity,
 285                                  GTlsCertificate     *trusted_ca)
 286 {
 287   GTlsCertificateGnutls *cert_gnutls;
 288   guint num_certs, i;
 289   gnutls_x509_crt_t *chain;
 290   GTlsCertificateFlags gtls_flags;
 291   time_t t, now;
 292
 293   cert_gnutls = G_TLS_CERTIFICATE_GNUTLS (cert);
 294   for (num_certs = 0; cert_gnutls; cert_gnutls = cert_gnutls->priv->issuer)
 295     num_certs++;
 296   chain = g_new (gnutls_x509_crt_t, num_certs);
 297   cert_gnutls = G_TLS_CERTIFICATE_GNUTLS (cert);
 298   for (i = 0; cert_gnutls; cert_gnutls = cert_gnutls->priv->issuer, i++)
 299     chain[i] = cert_gnutls->priv->cert;
 300
 301   if (trusted_ca)
 302     {
 303       gnutls_x509_crt_t ca;
 304       guint gnutls_flags;
 305       int status;
 306
 307       ca = G_TLS_CERTIFICATE_GNUTLS (trusted_ca)->priv->cert;
 308       status = gnutls_x509_crt_list_verify (chain, num_certs,
 309                                             &ca, 1,
 310                                             NULL, 0,
 311                                             GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT,
 312                                             &gnutls_flags);
 313       if (status != 0)
 314         {
 315           g_free (chain);
 316           return G_TLS_CERTIFICATE_GENERIC_ERROR;
 317         }
 318
 319       gtls_flags = g_tls_certificate_gnutls_convert_flags (gnutls_flags);
 320     }
 321
 322   /* We have to check these ourselves since gnutls_x509_crt_list_verify
 323    * won't bother if it gets an UNKNOWN_CA.
 324    */
 325   now = time (NULL);
 326   for (i = 0; i < num_certs; i++)
 327     {
 328       t = gnutls_x509_crt_get_activation_time (chain[i]);
 329       if (t == (time_t) -1 || t > now)
 330         gtls_flags |= G_TLS_CERTIFICATE_NOT_ACTIVATED;
 331
 332       t = gnutls_x509_crt_get_expiration_time (chain[i]);
 333       if (t == (time_t) -1 || t < now)
 334         gtls_flags |= G_TLS_CERTIFICATE_EXPIRED;
 335     }
 336
 337   g_free (chain);
 338
 339   if (identity)
 340     gtls_flags |= g_tls_certificate_gnutls_verify_identity (G_TLS_CERTIFICATE_GNUTLS (cert), identity);
 341
 342   return gtls_flags;
 343 }
 344
 345 static void
 346 g_tls_certificate_gnutls_class_init (GTlsCertificateGnutlsClass *klass)
 347 {
 348   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 349   GTlsCertificateClass *certificate_class = G_TLS_CERTIFICATE_CLASS (klass);
 350
 351   g_type_class_add_private (klass, sizeof (GTlsCertificateGnutlsPrivate));
 352
 353   gobject_class->get_property = g_tls_certificate_gnutls_get_property;
 354   gobject_class->set_property = g_tls_certificate_gnutls_set_property;
 355   gobject_class->finalize     = g_tls_certificate_gnutls_finalize;
 356
 357   certificate_class->verify = g_tls_certificate_gnutls_verify;
 358
 359   g_object_class_override_property (gobject_class, PROP_CERTIFICATE, "certificate");
 360   g_object_class_override_property (gobject_class, PROP_CERTIFICATE_PEM, "certificate-pem");
 361   g_object_class_override_property (gobject_class, PROP_PRIVATE_KEY, "private-key");
 362   g_object_class_override_property (gobject_class, PROP_PRIVATE_KEY_PEM, "private-key-pem");
 363   g_object_class_override_property (gobject_class, PROP_ISSUER, "issuer");
 364 }
 365
 366 static void
 367 g_tls_certificate_gnutls_initable_iface_init (GInitableIface  *iface)
 368 {
 369   iface->init = g_tls_certificate_gnutls_initable_init;
 370 }
 371
 372 GTlsCertificate *
 373 g_tls_certificate_gnutls_new (const gnutls_datum *datum,
 374                               GTlsCertificate    *issuer)
 375 {
 376   GTlsCertificateGnutls *gnutls;
 377
 378   gnutls = g_object_new (G_TYPE_TLS_CERTIFICATE_GNUTLS,
 379                          "issuer", issuer,
 380                          NULL);
 381   if (gnutls_x509_crt_import (gnutls->priv->cert, datum,
 382                               GNUTLS_X509_FMT_DER) == 0)
 383     gnutls->priv->have_cert = TRUE;
 384
 385   return G_TLS_CERTIFICATE (gnutls);
 386 }
 387
 388 const gnutls_x509_crt_t
 389 g_tls_certificate_gnutls_get_cert (GTlsCertificateGnutls *gnutls)
 390 {
 391   return gnutls->priv->cert;
 392 }
 393
 394 const gnutls_x509_privkey_t
 395 g_tls_certificate_gnutls_get_key (GTlsCertificateGnutls *gnutls)
 396 {
 397   return gnutls->priv->key;
 398 }
 399
 400 gnutls_x509_crt_t
 401 g_tls_certificate_gnutls_copy_cert (GTlsCertificateGnutls *gnutls)
 402 {
 403   gnutls_x509_crt_t cert;
 404   gnutls_datum data;
 405   size_t size;
 406
 407   size = 0;
 408   gnutls_x509_crt_export (gnutls->priv->cert, GNUTLS_X509_FMT_DER,
 409                           NULL, &size);
 410   data.data = g_malloc (size);
 411   data.size = size;
 412   gnutls_x509_crt_export (gnutls->priv->cert, GNUTLS_X509_FMT_DER,
 413                           data.data, &size);
 414
 415   gnutls_x509_crt_init (&cert);
 416   gnutls_x509_crt_import (cert, &data, GNUTLS_X509_FMT_DER);
 417   g_free (data.data);
 418
 419   return cert;
 420 }
 421
 422 gnutls_x509_privkey_t
 423 g_tls_certificate_gnutls_copy_key  (GTlsCertificateGnutls *gnutls)
 424 {
 425   gnutls_x509_privkey_t key;
 426
 427   gnutls_x509_privkey_init (&key);
 428   gnutls_x509_privkey_cpy (key, gnutls->priv->key);
 429   return key;
 430 }
 431
 432 static const struct {
 433   int gnutls_flag;
 434   GTlsCertificateFlags gtls_flag;
 435 } flags_map[] = {
 436   { GNUTLS_CERT_SIGNER_NOT_FOUND | GNUTLS_CERT_SIGNER_NOT_CA, G_TLS_CERTIFICATE_UNKNOWN_CA },
 437   { GNUTLS_CERT_NOT_ACTIVATED, G_TLS_CERTIFICATE_NOT_ACTIVATED },
 438   { GNUTLS_CERT_EXPIRED, G_TLS_CERTIFICATE_EXPIRED },
 439   { GNUTLS_CERT_REVOKED, G_TLS_CERTIFICATE_REVOKED },
 440   { GNUTLS_CERT_INSECURE_ALGORITHM, G_TLS_CERTIFICATE_INSECURE }
 441 };
 442 static const int flags_map_size = G_N_ELEMENTS (flags_map);
 443
 444 GTlsCertificateFlags
 445 g_tls_certificate_gnutls_convert_flags (guint gnutls_flags)
 446 {
 447   int i;
 448   GTlsCertificateFlags gtls_flags;
 449
 450   /* Convert GNUTLS status to GTlsCertificateFlags. GNUTLS sets
 451    * GNUTLS_CERT_INVALID if it sets any other flag, so we want to
 452    * strip that out unless it's the only flag set. Then we convert
 453    * specific flags we recognize, and if there are any flags left over
 454    * at the end, we add G_TLS_CERTIFICATE_GENERIC_ERROR.
 455    */
 456   gtls_flags = 0;
 457
 458   if (gnutls_flags != GNUTLS_CERT_INVALID)
 459     gnutls_flags = gnutls_flags & ~GNUTLS_CERT_INVALID;
 460   for (i = 0; i < flags_map_size && gnutls_flags != 0; i++)
 461     {
 462       if (gnutls_flags & flags_map[i].gnutls_flag)
 463         {
 464           gnutls_flags &= ~flags_map[i].gnutls_flag;
 465           gtls_flags |= flags_map[i].gtls_flag;
 466         }
 467     }
 468   if (gnutls_flags)
 469     gtls_flags |= G_TLS_CERTIFICATE_GENERIC_ERROR;
 470
 471   return gtls_flags;
 472 }
 473
 474 GTlsCertificateFlags
 475 g_tls_certificate_gnutls_verify_identity (GTlsCertificateGnutls *gnutls,
 476                                           GSocketConnectable    *identity)
 477 {
 478   const char *hostname;
 479
 480   if (G_IS_NETWORK_ADDRESS (identity))
 481     hostname = g_network_address_get_hostname (G_NETWORK_ADDRESS (identity));
 482   else if (G_IS_NETWORK_SERVICE (identity))
 483     hostname = g_network_service_get_domain (G_NETWORK_SERVICE (identity));
 484   else
 485     hostname = NULL;
 486
 487   if (hostname)
 488     {
 489       if (gnutls_x509_crt_check_hostname (gnutls->priv->cert, hostname))
 490         return 0;
 491     }
 492
 493   /* FIXME: check sRVName and uniformResourceIdentifier
 494    * subjectAltNames, if appropriate for @identity.
 495    */
 496
 497   return G_TLS_CERTIFICATE_BAD_IDENTITY;
 498 }