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, see
  17  * <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <gnutls/gnutls.h>
  23 #include <gnutls/x509.h>
  24 #include <string.h>
  25
  26 #include "gtlscertificate-gnutls.h"
  27 #include <glib/gi18n-lib.h>
  28
  29 static void     g_tls_certificate_gnutls_initable_iface_init (GInitableIface  *iface);
  30
  31 G_DEFINE_TYPE_WITH_CODE (GTlsCertificateGnutls, g_tls_certificate_gnutls, G_TYPE_TLS_CERTIFICATE,
  32                          G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
  33                                                 g_tls_certificate_gnutls_initable_iface_init);)
  34
  35 enum
  36 {
  37   PROP_0,
  38
  39   PROP_CERTIFICATE,
  40   PROP_CERTIFICATE_PEM,
  41   PROP_PRIVATE_KEY,
  42   PROP_PRIVATE_KEY_PEM,
  43   PROP_ISSUER
  44 };
  45
  46 struct _GTlsCertificateGnutlsPrivate
  47 {
  48   gnutls_x509_crt_t cert;
  49   gnutls_x509_privkey_t key;
  50
  51   GTlsCertificateGnutls *issuer;
  52
  53   GError *construct_error;
  54
  55   guint have_cert : 1;
  56   guint have_key  : 1;
  57 };
  58
  59 static void
  60 g_tls_certificate_gnutls_finalize (GObject *object)
  61 {
  62   GTlsCertificateGnutls *gnutls = G_TLS_CERTIFICATE_GNUTLS (object);
  63
  64   gnutls_x509_crt_deinit (gnutls->priv->cert);
  65   if (gnutls->priv->key)
  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       if (!gnutls->priv->key)
 207         gnutls_x509_privkey_init (&gnutls->priv->key);
 208       status = gnutls_x509_privkey_import (gnutls->priv->key, &data,
 209                                            GNUTLS_X509_FMT_DER);
 210       if (status == 0)
 211         gnutls->priv->have_key = TRUE;
 212       else if (!gnutls->priv->construct_error)
 213         {
 214           gnutls->priv->construct_error =
 215             g_error_new (G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
 216                          _("Could not parse DER private key: %s"),
 217                          gnutls_strerror (status));
 218         }
 219       break;
 220
 221     case PROP_PRIVATE_KEY_PEM:
 222       string = g_value_get_string (value);
 223       if (!string)
 224         break;
 225       g_return_if_fail (gnutls->priv->have_key == FALSE);
 226       data.data = (void *)string;
 227       data.size = strlen (string);
 228       if (!gnutls->priv->key)
 229         gnutls_x509_privkey_init (&gnutls->priv->key);
 230       status = gnutls_x509_privkey_import (gnutls->priv->key, &data,
 231                                            GNUTLS_X509_FMT_PEM);
 232       if (status == 0)
 233         gnutls->priv->have_key = TRUE;
 234       else if (!gnutls->priv->construct_error)
 235         {
 236           gnutls->priv->construct_error =
 237             g_error_new (G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
 238                          _("Could not parse PEM private key: %s"),
 239                          gnutls_strerror (status));
 240         }
 241       break;
 242
 243     case PROP_ISSUER:
 244       gnutls->priv->issuer = g_value_dup_object (value);
 245       break;
 246
 247     default:
 248       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 249     }
 250 }
 251
 252 static void
 253 g_tls_certificate_gnutls_init (GTlsCertificateGnutls *gnutls)
 254 {
 255   gnutls->priv = G_TYPE_INSTANCE_GET_PRIVATE (gnutls,
 256                                               G_TYPE_TLS_CERTIFICATE_GNUTLS,
 257                                               GTlsCertificateGnutlsPrivate);
 258
 259   gnutls_x509_crt_init (&gnutls->priv->cert);
 260 }
 261
 262 static gboolean
 263 g_tls_certificate_gnutls_initable_init (GInitable       *initable,
 264                                         GCancellable    *cancellable,
 265                                         GError         **error)
 266 {
 267   GTlsCertificateGnutls *gnutls = G_TLS_CERTIFICATE_GNUTLS (initable);
 268
 269   if (gnutls->priv->construct_error)
 270     {
 271       g_propagate_error (error, gnutls->priv->construct_error);
 272       gnutls->priv->construct_error = NULL;
 273       return FALSE;
 274     }
 275   else if (!gnutls->priv->have_cert)
 276     {
 277       g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
 278                            _("No certificate data provided"));
 279       return FALSE;
 280     }
 281   else
 282     return TRUE;
 283 }
 284
 285 static GTlsCertificateFlags
 286 g_tls_certificate_gnutls_verify (GTlsCertificate     *cert,
 287                                  GSocketConnectable  *identity,
 288                                  GTlsCertificate     *trusted_ca)
 289 {
 290   GTlsCertificateGnutls *cert_gnutls;
 291   guint num_certs, i;
 292   gnutls_x509_crt_t *chain;
 293   GTlsCertificateFlags gtls_flags;
 294   time_t t, now;
 295
 296   cert_gnutls = G_TLS_CERTIFICATE_GNUTLS (cert);
 297   for (num_certs = 0; cert_gnutls; cert_gnutls = cert_gnutls->priv->issuer)
 298     num_certs++;
 299   chain = g_new (gnutls_x509_crt_t, num_certs);
 300   cert_gnutls = G_TLS_CERTIFICATE_GNUTLS (cert);
 301   for (i = 0; cert_gnutls; cert_gnutls = cert_gnutls->priv->issuer, i++)
 302     chain[i] = cert_gnutls->priv->cert;
 303
 304   if (trusted_ca)
 305     {
 306       gnutls_x509_crt_t ca;
 307       guint gnutls_flags;
 308       int status;
 309
 310       ca = G_TLS_CERTIFICATE_GNUTLS (trusted_ca)->priv->cert;
 311       status = gnutls_x509_crt_list_verify (chain, num_certs,
 312                                             &ca, 1,
 313                                             NULL, 0,
 314                                             GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT,
 315                                             &gnutls_flags);
 316       if (status != 0)
 317         {
 318           g_free (chain);
 319           return G_TLS_CERTIFICATE_GENERIC_ERROR;
 320         }
 321
 322       gtls_flags = g_tls_certificate_gnutls_convert_flags (gnutls_flags);
 323     }
 324   else
 325     gtls_flags = 0;
 326
 327   /* We have to check these ourselves since gnutls_x509_crt_list_verify
 328    * won't bother if it gets an UNKNOWN_CA.
 329    */
 330   now = time (NULL);
 331   for (i = 0; i < num_certs; i++)
 332     {
 333       t = gnutls_x509_crt_get_activation_time (chain[i]);
 334       if (t == (time_t) -1 || t > now)
 335         gtls_flags |= G_TLS_CERTIFICATE_NOT_ACTIVATED;
 336
 337       t = gnutls_x509_crt_get_expiration_time (chain[i]);
 338       if (t == (time_t) -1 || t < now)
 339         gtls_flags |= G_TLS_CERTIFICATE_EXPIRED;
 340     }
 341
 342   g_free (chain);
 343
 344   if (identity)
 345     gtls_flags |= g_tls_certificate_gnutls_verify_identity (G_TLS_CERTIFICATE_GNUTLS (cert), identity);
 346
 347   return gtls_flags;
 348 }
 349
 350 static void
 351 g_tls_certificate_gnutls_real_copy (GTlsCertificateGnutls    *gnutls,
 352                                     const gchar              *interaction_id,
 353                                     gnutls_retr2_st          *st)
 354 {
 355   gnutls_x509_crt_t cert;
 356   gnutls_datum data;
 357   size_t size = 0;
 358
 359   gnutls_x509_crt_export (gnutls->priv->cert, GNUTLS_X509_FMT_DER,
 360                           NULL, &size);
 361   data.data = g_malloc (size);
 362   data.size = size;
 363   gnutls_x509_crt_export (gnutls->priv->cert, GNUTLS_X509_FMT_DER,
 364                           data.data, &size);
 365
 366   gnutls_x509_crt_init (&cert);
 367   gnutls_x509_crt_import (cert, &data, GNUTLS_X509_FMT_DER);
 368   g_free (data.data);
 369
 370   st->ncerts = 1;
 371   st->cert.x509 = gnutls_malloc (sizeof (gnutls_x509_crt_t));
 372   st->cert.x509[0] = cert;
 373
 374   if (gnutls->priv->key != NULL)
 375     {
 376       gnutls_x509_privkey_init (&st->key.x509);
 377       gnutls_x509_privkey_cpy (st->key.x509, gnutls->priv->key);
 378       st->key_type = GNUTLS_PRIVKEY_X509;
 379     }
 380
 381   st->deinit_all = TRUE;
 382 }
 383
 384 static void
 385 g_tls_certificate_gnutls_class_init (GTlsCertificateGnutlsClass *klass)
 386 {
 387   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 388   GTlsCertificateClass *certificate_class = G_TLS_CERTIFICATE_CLASS (klass);
 389
 390   g_type_class_add_private (klass, sizeof (GTlsCertificateGnutlsPrivate));
 391
 392   gobject_class->get_property = g_tls_certificate_gnutls_get_property;
 393   gobject_class->set_property = g_tls_certificate_gnutls_set_property;
 394   gobject_class->finalize     = g_tls_certificate_gnutls_finalize;
 395
 396   certificate_class->verify = g_tls_certificate_gnutls_verify;
 397
 398   klass->copy = g_tls_certificate_gnutls_real_copy;
 399
 400   g_object_class_override_property (gobject_class, PROP_CERTIFICATE, "certificate");
 401   g_object_class_override_property (gobject_class, PROP_CERTIFICATE_PEM, "certificate-pem");
 402   g_object_class_override_property (gobject_class, PROP_PRIVATE_KEY, "private-key");
 403   g_object_class_override_property (gobject_class, PROP_PRIVATE_KEY_PEM, "private-key-pem");
 404   g_object_class_override_property (gobject_class, PROP_ISSUER, "issuer");
 405 }
 406
 407 static void
 408 g_tls_certificate_gnutls_initable_iface_init (GInitableIface  *iface)
 409 {
 410   iface->init = g_tls_certificate_gnutls_initable_init;
 411 }
 412
 413 GTlsCertificate *
 414 g_tls_certificate_gnutls_new (const gnutls_datum *datum,
 415                               GTlsCertificate    *issuer)
 416 {
 417   GTlsCertificateGnutls *gnutls;
 418
 419   gnutls = g_object_new (G_TYPE_TLS_CERTIFICATE_GNUTLS,
 420                          "issuer", issuer,
 421                          NULL);
 422   g_tls_certificate_gnutls_set_data (gnutls, datum);
 423
 424   return G_TLS_CERTIFICATE (gnutls);
 425 }
 426
 427 void
 428 g_tls_certificate_gnutls_set_data (GTlsCertificateGnutls *gnutls,
 429                                    const gnutls_datum *datum)
 430 {
 431   g_return_if_fail (G_IS_TLS_CERTIFICATE_GNUTLS (gnutls));
 432   g_return_if_fail (!gnutls->priv->have_cert);
 433
 434   if (gnutls_x509_crt_import (gnutls->priv->cert, datum,
 435                               GNUTLS_X509_FMT_DER) == 0)
 436     gnutls->priv->have_cert = TRUE;
 437 }
 438
 439 const gnutls_x509_crt_t
 440 g_tls_certificate_gnutls_get_cert (GTlsCertificateGnutls *gnutls)
 441 {
 442   return gnutls->priv->cert;
 443 }
 444
 445 void
 446 g_tls_certificate_gnutls_copy  (GTlsCertificateGnutls *gnutls,
 447                                 const gchar           *interaction_id,
 448                                 gnutls_retr2_st       *st)
 449 {
 450   g_return_if_fail (G_IS_TLS_CERTIFICATE_GNUTLS (gnutls));
 451   g_return_if_fail (st != NULL);
 452   g_return_if_fail (G_TLS_CERTIFICATE_GNUTLS_GET_CLASS (gnutls)->copy);
 453   G_TLS_CERTIFICATE_GNUTLS_GET_CLASS (gnutls)->copy (gnutls, interaction_id, st);
 454 }
 455
 456 static const struct {
 457   int gnutls_flag;
 458   GTlsCertificateFlags gtls_flag;
 459 } flags_map[] = {
 460   { GNUTLS_CERT_SIGNER_NOT_FOUND | GNUTLS_CERT_SIGNER_NOT_CA, G_TLS_CERTIFICATE_UNKNOWN_CA },
 461   { GNUTLS_CERT_NOT_ACTIVATED, G_TLS_CERTIFICATE_NOT_ACTIVATED },
 462   { GNUTLS_CERT_EXPIRED, G_TLS_CERTIFICATE_EXPIRED },
 463   { GNUTLS_CERT_REVOKED, G_TLS_CERTIFICATE_REVOKED },
 464   { GNUTLS_CERT_INSECURE_ALGORITHM, G_TLS_CERTIFICATE_INSECURE }
 465 };
 466 static const int flags_map_size = G_N_ELEMENTS (flags_map);
 467
 468 GTlsCertificateFlags
 469 g_tls_certificate_gnutls_convert_flags (guint gnutls_flags)
 470 {
 471   int i;
 472   GTlsCertificateFlags gtls_flags;
 473
 474   /* Convert GNUTLS status to GTlsCertificateFlags. GNUTLS sets
 475    * GNUTLS_CERT_INVALID if it sets any other flag, so we want to
 476    * strip that out unless it's the only flag set. Then we convert
 477    * specific flags we recognize, and if there are any flags left over
 478    * at the end, we add G_TLS_CERTIFICATE_GENERIC_ERROR.
 479    */
 480   gtls_flags = 0;
 481
 482   if (gnutls_flags != GNUTLS_CERT_INVALID)
 483     gnutls_flags = gnutls_flags & ~GNUTLS_CERT_INVALID;
 484   for (i = 0; i < flags_map_size && gnutls_flags != 0; i++)
 485     {
 486       if (gnutls_flags & flags_map[i].gnutls_flag)
 487         {
 488           gnutls_flags &= ~flags_map[i].gnutls_flag;
 489           gtls_flags |= flags_map[i].gtls_flag;
 490         }
 491     }
 492   if (gnutls_flags)
 493     gtls_flags |= G_TLS_CERTIFICATE_GENERIC_ERROR;
 494
 495   return gtls_flags;
 496 }
 497
 498 GTlsCertificateFlags
 499 g_tls_certificate_gnutls_verify_identity (GTlsCertificateGnutls *gnutls,
 500                                           GSocketConnectable    *identity)
 501 {
 502   const char *hostname;
 503
 504   if (G_IS_NETWORK_ADDRESS (identity))
 505     hostname = g_network_address_get_hostname (G_NETWORK_ADDRESS (identity));
 506   else if (G_IS_NETWORK_SERVICE (identity))
 507     hostname = g_network_service_get_domain (G_NETWORK_SERVICE (identity));
 508   else
 509     hostname = NULL;
 510
 511   if (hostname)
 512     {
 513       if (gnutls_x509_crt_check_hostname (gnutls->priv->cert, hostname))
 514         return 0;
 515     }
 516
 517   /* FIXME: check sRVName and uniformResourceIdentifier
 518    * subjectAltNames, if appropriate for @identity.
 519    */
 520
 521   return G_TLS_CERTIFICATE_BAD_IDENTITY;
 522 }
 523
 524 void
 525 g_tls_certificate_gnutls_set_issuer (GTlsCertificateGnutls *gnutls,
 526                                      GTlsCertificateGnutls *issuer)
 527 {
 528   g_return_if_fail (G_IS_TLS_CERTIFICATE_GNUTLS (gnutls));
 529   g_return_if_fail (!issuer || G_IS_TLS_CERTIFICATE_GNUTLS (issuer));
 530
 531   if (issuer)
 532     g_object_ref (issuer);
 533   if (gnutls->priv->issuer)
 534     g_object_unref (gnutls->priv->issuer);
 535   gnutls->priv->issuer = issuer;
 536   g_object_notify (G_OBJECT (gnutls), "issuer");
 537 }