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 21866 2007-08-08 11:31:29Z 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->target_name); 133 gss_release_name(&minor, &ctx->mech_src_name); 134 135 if (ctx->negotiated_ctx_id != GSS_C_NO_CONTEXT) { 136 ret = gss_delete_sec_context(minor_status, 137 &ctx->negotiated_ctx_id, 138 output_token); 139 ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT; 140 } else { 141 ret = GSS_S_COMPLETE; 142 } 143 144 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); 145 HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex); 146 147 free(ctx); 148 *context_handle = NULL; 149 150 return ret; 151 } 152 153 /* 154 * For compatability with the Windows SPNEGO implementation, the 155 * default is to ignore the mechListMIC unless CFX is used and 156 * a non-preferred mechanism was negotiated 157 */ 158 159 OM_uint32 160 _gss_spnego_require_mechlist_mic(OM_uint32 *minor_status, 161 gssspnego_ctx ctx, 162 int *require_mic) 163 { 164 gss_buffer_set_t buffer_set = GSS_C_NO_BUFFER_SET; 165 OM_uint32 minor; 166 167 *minor_status = 0; 168 *require_mic = 0; 169 170 if (ctx == NULL) { 171 return GSS_S_COMPLETE; 172 } 173 174 if (ctx->require_mic) { 175 /* Acceptor requested it: mandatory to honour */ 176 *require_mic = 1; 177 return GSS_S_COMPLETE; 178 } 179 180 /* 181 * Check whether peer indicated implicit support for updated SPNEGO 182 * (eg. in the Kerberos case by using CFX) 183 */ 184 if (gss_inquire_sec_context_by_oid(&minor, ctx->negotiated_ctx_id, 185 GSS_C_PEER_HAS_UPDATED_SPNEGO, 186 &buffer_set) == GSS_S_COMPLETE) { 187 *require_mic = 1; 188 gss_release_buffer_set(&minor, &buffer_set); 189 } 190 191 /* Safe-to-omit MIC rules follow */ 192 if (*require_mic) { 193 if (gss_oid_equal(ctx->negotiated_mech_type, ctx->preferred_mech_type)) { 194 *require_mic = 0; 195 } else if (gss_oid_equal(ctx->negotiated_mech_type, &_gss_spnego_krb5_mechanism_oid_desc) && 196 gss_oid_equal(ctx->preferred_mech_type, &_gss_spnego_mskrb_mechanism_oid_desc)) { 197 *require_mic = 0; 198 } 199 } 200 201 return GSS_S_COMPLETE; 202 } 203 204 static int 205 add_mech_type(gss_OID mech_type, 206 int includeMSCompatOID, 207 MechTypeList *mechtypelist) 208 { 209 MechType mech; 210 int ret; 211 212 if (gss_oid_equal(mech_type, GSS_SPNEGO_MECHANISM)) 213 return 0; 214 215 if (includeMSCompatOID && 216 gss_oid_equal(mech_type, &_gss_spnego_krb5_mechanism_oid_desc)) { 217 ret = der_get_oid(_gss_spnego_mskrb_mechanism_oid_desc.elements, 218 _gss_spnego_mskrb_mechanism_oid_desc.length, 219 &mech, 220 NULL); 221 if (ret) 222 return ret; 223 ret = add_MechTypeList(mechtypelist, &mech); 224 free_MechType(&mech); 225 if (ret) 226 return ret; 227 } 228 ret = der_get_oid(mech_type->elements, mech_type->length, &mech, NULL); 229 if (ret) 230 return ret; 231 ret = add_MechTypeList(mechtypelist, &mech); 232 free_MechType(&mech); 233 return ret; 234 } 235 236 237 OM_uint32 238 _gss_spnego_indicate_mechtypelist (OM_uint32 *minor_status, 239 gss_name_t target_name, 240 OM_uint32 (*func)(gss_name_t, gss_OID), 241 int includeMSCompatOID, 242 const gssspnego_cred cred_handle, 243 MechTypeList *mechtypelist, 244 gss_OID *preferred_mech) 245 { 246 gss_OID_set supported_mechs = GSS_C_NO_OID_SET; 247 gss_OID first_mech = GSS_C_NO_OID; 248 OM_uint32 ret; 249 int i; 250 251 mechtypelist->len = 0; 252 mechtypelist->val = NULL; 253 254 if (cred_handle != NULL) { 255 ret = gss_inquire_cred(minor_status, 256 cred_handle->negotiated_cred_id, 257 NULL, 258 NULL, 259 NULL, 260 &supported_mechs); 261 } else { 262 ret = gss_indicate_mechs(minor_status, &supported_mechs); 263 } 264 265 if (ret != GSS_S_COMPLETE) { 266 return ret; 267 } 268 269 if (supported_mechs->count == 0) { 270 *minor_status = ENOENT; 271 gss_release_oid_set(minor_status, &supported_mechs); 272 return GSS_S_FAILURE; 273 } 274 275 ret = (*func)(target_name, GSS_KRB5_MECHANISM); 276 if (ret == GSS_S_COMPLETE) { 277 ret = add_mech_type(GSS_KRB5_MECHANISM, 278 includeMSCompatOID, 279 mechtypelist); 280 if (!GSS_ERROR(ret)) 281 first_mech = GSS_KRB5_MECHANISM; 282 } 283 ret = GSS_S_COMPLETE; 284 285 for (i = 0; i < supported_mechs->count; i++) { 286 OM_uint32 subret; 287 if (gss_oid_equal(&supported_mechs->elements[i], GSS_SPNEGO_MECHANISM)) 288 continue; 289 if (gss_oid_equal(&supported_mechs->elements[i], GSS_KRB5_MECHANISM)) 290 continue; 291 292 subret = (*func)(target_name, &supported_mechs->elements[i]); 293 if (subret != GSS_S_COMPLETE) 294 continue; 295 296 ret = add_mech_type(&supported_mechs->elements[i], 297 includeMSCompatOID, 298 mechtypelist); 299 if (ret != 0) { 300 *minor_status = ret; 301 ret = GSS_S_FAILURE; 302 break; 303 } 304 if (first_mech == GSS_C_NO_OID) 305 first_mech = &supported_mechs->elements[i]; 306 } 307 308 if (mechtypelist->len == 0) { 309 gss_release_oid_set(minor_status, &supported_mechs); 310 *minor_status = 0; 311 return GSS_S_BAD_MECH; 312 } 313 314 if (preferred_mech != NULL) { 315 ret = gss_duplicate_oid(minor_status, first_mech, preferred_mech); 316 if (ret != GSS_S_COMPLETE) 317 free_MechTypeList(mechtypelist); 318 } 319 gss_release_oid_set(minor_status, &supported_mechs); 320 321 return ret; 322 } 323