source/heimdal/lib/gssapi/spnego/compat.c

   1 /*
   2  * Copyright (c) 2004, PADL Software Pty Ltd.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of PADL Software nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include "spnego/spnego_locl.h"
  34
  35 RCSID("$Id: compat.c 19415 2006-12-18 17:52:26Z lha $");
  36
  37 /*
  38  * Apparently Microsoft got the OID wrong, and used
  39  * 1.2.840.48018.1.2.2 instead. We need both this and
  40  * the correct Kerberos OID here in order to deal with
  41  * this. Because this is manifest in SPNEGO only I'd
  42  * prefer to deal with this here rather than inside the
  43  * Kerberos mechanism.
  44  */
  45 gss_OID_desc _gss_spnego_mskrb_mechanism_oid_desc =
  46         {9, (void *)"\x2a\x86\x48\x82\xf7\x12\x01\x02\x02"};
  47
  48 gss_OID_desc _gss_spnego_krb5_mechanism_oid_desc =
  49         {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"};
  50
  51 /*
  52  * Allocate a SPNEGO context handle
  53  */
  54 OM_uint32 _gss_spnego_alloc_sec_context (OM_uint32 * minor_status,
  55                                          gss_ctx_id_t *context_handle)
  56 {
  57     gssspnego_ctx ctx;
  58
  59     ctx = calloc(1, sizeof(*ctx));
  60     if (ctx == NULL) {
  61         *minor_status = ENOMEM;
  62         return GSS_S_FAILURE;
  63     }
  64
  65     ctx->initiator_mech_types.len = 0;
  66     ctx->initiator_mech_types.val = NULL;
  67     ctx->preferred_mech_type = GSS_C_NO_OID;
  68     ctx->negotiated_mech_type = GSS_C_NO_OID;
  69     ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
  70
  71     /*
  72      * Cache these so we can return them before returning
  73      * GSS_S_COMPLETE, even if the mechanism has itself
  74      * completed earlier
  75      */
  76     ctx->mech_flags = 0;
  77     ctx->mech_time_rec = 0;
  78     ctx->mech_src_name = GSS_C_NO_NAME;
  79     ctx->delegated_cred_id = GSS_C_NO_CREDENTIAL;
  80
  81     ctx->open = 0;
  82     ctx->local = 0;
  83     ctx->require_mic = 0;
  84     ctx->verified_mic = 0;
  85
  86     HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex);
  87
  88     *context_handle = (gss_ctx_id_t)ctx;
  89
  90     return GSS_S_COMPLETE;
  91 }
  92
  93 /*
  94  * Free a SPNEGO context handle. The caller must have acquired
  95  * the lock before this is called.
  96  */
  97 OM_uint32 _gss_spnego_internal_delete_sec_context
  98            (OM_uint32 *minor_status,
  99             gss_ctx_id_t *context_handle,
 100             gss_buffer_t output_token
 101            )
 102 {
 103     gssspnego_ctx ctx;
 104     OM_uint32 ret, minor;
 105
 106     *minor_status = 0;
 107
 108     if (context_handle == NULL) {
 109         return GSS_S_NO_CONTEXT;
 110     }
 111
 112     if (output_token != GSS_C_NO_BUFFER) {
 113         output_token->length = 0;
 114         output_token->value = NULL;
 115     }
 116
 117     ctx = (gssspnego_ctx)*context_handle;
 118     *context_handle = GSS_C_NO_CONTEXT;
 119
 120     if (ctx == NULL) {
 121         return GSS_S_NO_CONTEXT;
 122     }
 123
 124     if (ctx->initiator_mech_types.val != NULL)
 125         free_MechTypeList(&ctx->initiator_mech_types);
 126
 127     _gss_spnego_release_cred(&minor, &ctx->delegated_cred_id);
 128
 129     gss_release_oid(&minor, &ctx->preferred_mech_type);
 130     ctx->negotiated_mech_type = GSS_C_NO_OID;
 131
 132     gss_release_name(&minor, &ctx->mech_src_name);
 133
 134     if (ctx->negotiated_ctx_id != GSS_C_NO_CONTEXT) {
 135         ret = gss_delete_sec_context(minor_status,
 136                                      &ctx->negotiated_ctx_id,
 137                                      output_token);
 138         ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
 139     } else {
 140         ret = GSS_S_COMPLETE;
 141     }
 142
 143     HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 144     HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
 145
 146     free(ctx);
 147     *context_handle = NULL;
 148
 149     return ret;
 150 }
 151
 152 /*
 153  * For compatability with the Windows SPNEGO implementation, the
 154  * default is to ignore the mechListMIC unless CFX is used and
 155  * a non-preferred mechanism was negotiated
 156  */
 157
 158 OM_uint32
 159 _gss_spnego_require_mechlist_mic(OM_uint32 *minor_status,
 160                                  gssspnego_ctx ctx,
 161                                  int *require_mic)
 162 {
 163     gss_buffer_set_t buffer_set = GSS_C_NO_BUFFER_SET;
 164     OM_uint32 minor;
 165
 166     *minor_status = 0;
 167     *require_mic = 0;
 168
 169     if (ctx == NULL) {
 170         return GSS_S_COMPLETE;
 171     }
 172
 173     if (ctx->require_mic) {
 174         /* Acceptor requested it: mandatory to honour */
 175         *require_mic = 1;
 176         return GSS_S_COMPLETE;
 177     }
 178
 179     /*
 180      * Check whether peer indicated implicit support for updated SPNEGO
 181      * (eg. in the Kerberos case by using CFX)
 182      */
 183     if (gss_inquire_sec_context_by_oid(&minor, ctx->negotiated_ctx_id,
 184                                        GSS_C_PEER_HAS_UPDATED_SPNEGO,
 185                                        &buffer_set) == GSS_S_COMPLETE) {
 186         *require_mic = 1;
 187         gss_release_buffer_set(&minor, &buffer_set);
 188     }
 189
 190     /* Safe-to-omit MIC rules follow */
 191     if (*require_mic) {
 192         if (gss_oid_equal(ctx->negotiated_mech_type, ctx->preferred_mech_type)) {
 193             *require_mic = 0;
 194         } else if (gss_oid_equal(ctx->negotiated_mech_type, &_gss_spnego_krb5_mechanism_oid_desc) &&
 195                    gss_oid_equal(ctx->preferred_mech_type, &_gss_spnego_mskrb_mechanism_oid_desc)) {
 196             *require_mic = 0;
 197         }
 198     }
 199
 200     return GSS_S_COMPLETE;
 201 }
 202
 203 static int
 204 add_mech_type(gss_OID mech_type,
 205               int includeMSCompatOID,
 206               MechTypeList *mechtypelist)
 207 {
 208     MechType mech;
 209     int ret;
 210
 211     if (gss_oid_equal(mech_type, GSS_SPNEGO_MECHANISM))
 212         return 0;
 213
 214     if (includeMSCompatOID &&
 215         gss_oid_equal(mech_type, &_gss_spnego_krb5_mechanism_oid_desc)) {
 216         ret = der_get_oid(_gss_spnego_mskrb_mechanism_oid_desc.elements,
 217                           _gss_spnego_mskrb_mechanism_oid_desc.length,
 218                           &mech,
 219                           NULL);
 220         if (ret)
 221             return ret;
 222         ret = add_MechTypeList(mechtypelist, &mech);
 223         free_MechType(&mech);
 224         if (ret)
 225             return ret;
 226     }
 227     ret = der_get_oid(mech_type->elements, mech_type->length, &mech, NULL);
 228     if (ret)
 229         return ret;
 230     ret = add_MechTypeList(mechtypelist, &mech);
 231     free_MechType(&mech);
 232     return ret;
 233 }
 234
 235
 236 OM_uint32
 237 _gss_spnego_indicate_mechtypelist (OM_uint32 *minor_status,
 238                                    gss_name_t target_name,
 239                                    OM_uint32 (*func)(gss_name_t, gss_OID),
 240                                    int includeMSCompatOID,
 241                                    const gssspnego_cred cred_handle,
 242                                    MechTypeList *mechtypelist,
 243                                    gss_OID *preferred_mech)
 244 {
 245     gss_OID_set supported_mechs = GSS_C_NO_OID_SET;
 246     gss_OID first_mech = GSS_C_NO_OID;
 247     OM_uint32 ret;
 248     int i;
 249
 250     mechtypelist->len = 0;
 251     mechtypelist->val = NULL;
 252
 253     if (cred_handle != NULL) {
 254         ret = gss_inquire_cred(minor_status,
 255                                cred_handle->negotiated_cred_id,
 256                                NULL,
 257                                NULL,
 258                                NULL,
 259                                &supported_mechs);
 260     } else {
 261         ret = gss_indicate_mechs(minor_status, &supported_mechs);
 262     }
 263
 264     if (ret != GSS_S_COMPLETE) {
 265         return ret;
 266     }
 267
 268     if (supported_mechs->count == 0) {
 269         *minor_status = ENOENT;
 270         gss_release_oid_set(minor_status, &supported_mechs);
 271         return GSS_S_FAILURE;
 272     }
 273
 274     ret = (*func)(target_name, GSS_KRB5_MECHANISM);
 275     if (ret == GSS_S_COMPLETE) {
 276         ret = add_mech_type(GSS_KRB5_MECHANISM,
 277                             includeMSCompatOID,
 278                             mechtypelist);
 279         if (!GSS_ERROR(ret))
 280             first_mech = GSS_KRB5_MECHANISM;
 281     }
 282     ret = GSS_S_COMPLETE;
 283
 284     for (i = 0; i < supported_mechs->count; i++) {
 285         OM_uint32 subret;
 286         if (gss_oid_equal(&supported_mechs->elements[i], GSS_SPNEGO_MECHANISM))
 287             continue;
 288         if (gss_oid_equal(&supported_mechs->elements[i], GSS_KRB5_MECHANISM))
 289             continue;
 290
 291         subret = (*func)(target_name, &supported_mechs->elements[i]);
 292         if (subret != GSS_S_COMPLETE)
 293             continue;
 294
 295         ret = add_mech_type(&supported_mechs->elements[i],
 296                             includeMSCompatOID,
 297                             mechtypelist);
 298         if (ret != 0) {
 299             *minor_status = ret;
 300             ret = GSS_S_FAILURE;
 301             break;
 302         }
 303         if (first_mech == GSS_C_NO_OID)
 304             first_mech = &supported_mechs->elements[i];
 305     }
 306
 307     if (mechtypelist->len == 0) {
 308         gss_release_oid_set(minor_status, &supported_mechs);
 309         *minor_status = 0;
 310         return GSS_S_BAD_MECH;
 311     }
 312
 313     if (preferred_mech != NULL) {
 314         ret = gss_duplicate_oid(minor_status, first_mech, preferred_mech);
 315         if (ret != GSS_S_COMPLETE)
 316             free_MechTypeList(mechtypelist);
 317     }
 318     gss_release_oid_set(minor_status, &supported_mechs);
 319
 320     return ret;
 321 }