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_locl.h" 34 35RCSID("$Id: compat.c,v 1.1.1.1 2011/06/10 09:34:42 andrew Exp $"); 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 */ 45gss_OID_desc _gss_spnego_mskrb_mechanism_oid_desc = 46 {9, (void *)"\x2a\x86\x48\x82\xf7\x12\x01\x02\x02"}; 47 48gss_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 */ 54OM_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 80 ctx->open = 0; 81 ctx->local = 0; 82 ctx->require_mic = 0; 83 ctx->verified_mic = 0; 84 85 HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex); 86 87 *context_handle = (gss_ctx_id_t)ctx; 88 89 return GSS_S_COMPLETE; 90} 91 92/* 93 * Free a SPNEGO context handle. The caller must have acquired 94 * the lock before this is called. 95 */ 96OM_uint32 _gss_spnego_internal_delete_sec_context 97 (OM_uint32 *minor_status, 98 gss_ctx_id_t *context_handle, 99 gss_buffer_t output_token 100 ) 101{ 102 gssspnego_ctx ctx; 103 OM_uint32 ret, minor; 104 105 *minor_status = 0; 106 107 if (context_handle == NULL) { 108 return GSS_S_NO_CONTEXT; 109 } 110 111 if (output_token != GSS_C_NO_BUFFER) { 112 output_token->length = 0; 113 output_token->value = NULL; 114 } 115 116 ctx = (gssspnego_ctx)*context_handle; 117 *context_handle = GSS_C_NO_CONTEXT; 118 119 if (ctx == NULL) { 120 return GSS_S_NO_CONTEXT; 121 } 122 123 if (ctx->initiator_mech_types.val != NULL) 124 free_MechTypeList(&ctx->initiator_mech_types); 125 126 gss_release_oid(&minor, &ctx->preferred_mech_type); 127 ctx->negotiated_mech_type = GSS_C_NO_OID; 128 129 gss_release_name(&minor, &ctx->target_name); 130 gss_release_name(&minor, &ctx->mech_src_name); 131 132 if (ctx->negotiated_ctx_id != GSS_C_NO_CONTEXT) { 133 ret = gss_delete_sec_context(minor_status, 134 &ctx->negotiated_ctx_id, 135 output_token); 136 ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT; 137 } else { 138 ret = GSS_S_COMPLETE; 139 } 140 141 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); 142 HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex); 143 144 free(ctx); 145 *context_handle = NULL; 146 147 return ret; 148} 149 150/* 151 * For compatability with the Windows SPNEGO implementation, the 152 * default is to ignore the mechListMIC unless CFX is used and 153 * a non-preferred mechanism was negotiated 154 */ 155 156OM_uint32 157_gss_spnego_require_mechlist_mic(OM_uint32 *minor_status, 158 gssspnego_ctx ctx, 159 int *require_mic) 160{ 161 gss_buffer_set_t buffer_set = GSS_C_NO_BUFFER_SET; 162 OM_uint32 minor; 163 164 *minor_status = 0; 165 *require_mic = 0; 166 167 if (ctx == NULL) { 168 return GSS_S_COMPLETE; 169 } 170 171 if (ctx->require_mic) { 172 /* Acceptor requested it: mandatory to honour */ 173 *require_mic = 1; 174 return GSS_S_COMPLETE; 175 } 176 177 /* 178 * Check whether peer indicated implicit support for updated SPNEGO 179 * (eg. in the Kerberos case by using CFX) 180 */ 181 if (gss_inquire_sec_context_by_oid(&minor, ctx->negotiated_ctx_id, 182 GSS_C_PEER_HAS_UPDATED_SPNEGO, 183 &buffer_set) == GSS_S_COMPLETE) { 184 *require_mic = 1; 185 gss_release_buffer_set(&minor, &buffer_set); 186 } 187 188 /* Safe-to-omit MIC rules follow */ 189 if (*require_mic) { 190 if (gss_oid_equal(ctx->negotiated_mech_type, ctx->preferred_mech_type)) { 191 *require_mic = 0; 192 } else if (gss_oid_equal(ctx->negotiated_mech_type, &_gss_spnego_krb5_mechanism_oid_desc) && 193 gss_oid_equal(ctx->preferred_mech_type, &_gss_spnego_mskrb_mechanism_oid_desc)) { 194 *require_mic = 0; 195 } 196 } 197 198 return GSS_S_COMPLETE; 199} 200 201static int 202add_mech_type(gss_OID mech_type, 203 int includeMSCompatOID, 204 MechTypeList *mechtypelist) 205{ 206 MechType mech; 207 int ret; 208 209 if (gss_oid_equal(mech_type, GSS_SPNEGO_MECHANISM)) 210 return 0; 211 212 if (includeMSCompatOID && 213 gss_oid_equal(mech_type, &_gss_spnego_krb5_mechanism_oid_desc)) { 214 ret = der_get_oid(_gss_spnego_mskrb_mechanism_oid_desc.elements, 215 _gss_spnego_mskrb_mechanism_oid_desc.length, 216 &mech, 217 NULL); 218 if (ret) 219 return ret; 220 ret = add_MechTypeList(mechtypelist, &mech); 221 free_MechType(&mech); 222 if (ret) 223 return ret; 224 } 225 ret = der_get_oid(mech_type->elements, mech_type->length, &mech, NULL); 226 if (ret) 227 return ret; 228 ret = add_MechTypeList(mechtypelist, &mech); 229 free_MechType(&mech); 230 return ret; 231} 232 233 234OM_uint32 235_gss_spnego_indicate_mechtypelist (OM_uint32 *minor_status, 236 gss_name_t target_name, 237 OM_uint32 (*func)(gss_name_t, gss_OID), 238 int includeMSCompatOID, 239 const gssspnego_cred cred_handle, 240 MechTypeList *mechtypelist, 241 gss_OID *preferred_mech) 242{ 243 gss_OID_set supported_mechs = GSS_C_NO_OID_SET; 244 gss_OID first_mech = GSS_C_NO_OID; 245 OM_uint32 ret; 246 int i; 247 248 mechtypelist->len = 0; 249 mechtypelist->val = NULL; 250 251 if (cred_handle != NULL) { 252 ret = gss_inquire_cred(minor_status, 253 cred_handle->negotiated_cred_id, 254 NULL, 255 NULL, 256 NULL, 257 &supported_mechs); 258 } else { 259 ret = gss_indicate_mechs(minor_status, &supported_mechs); 260 } 261 262 if (ret != GSS_S_COMPLETE) { 263 return ret; 264 } 265 266 if (supported_mechs->count == 0) { 267 *minor_status = ENOENT; 268 gss_release_oid_set(minor_status, &supported_mechs); 269 return GSS_S_FAILURE; 270 } 271 272 ret = (*func)(target_name, GSS_KRB5_MECHANISM); 273 if (ret == GSS_S_COMPLETE) { 274 ret = add_mech_type(GSS_KRB5_MECHANISM, 275 includeMSCompatOID, 276 mechtypelist); 277 if (!GSS_ERROR(ret)) 278 first_mech = GSS_KRB5_MECHANISM; 279 } 280 ret = GSS_S_COMPLETE; 281 282 for (i = 0; i < supported_mechs->count; i++) { 283 OM_uint32 subret; 284 if (gss_oid_equal(&supported_mechs->elements[i], GSS_SPNEGO_MECHANISM)) 285 continue; 286 if (gss_oid_equal(&supported_mechs->elements[i], GSS_KRB5_MECHANISM)) 287 continue; 288 289 subret = (*func)(target_name, &supported_mechs->elements[i]); 290 if (subret != GSS_S_COMPLETE) 291 continue; 292 293 ret = add_mech_type(&supported_mechs->elements[i], 294 includeMSCompatOID, 295 mechtypelist); 296 if (ret != 0) { 297 *minor_status = ret; 298 ret = GSS_S_FAILURE; 299 break; 300 } 301 if (first_mech == GSS_C_NO_OID) 302 first_mech = &supported_mechs->elements[i]; 303 } 304 305 if (mechtypelist->len == 0) { 306 gss_release_oid_set(minor_status, &supported_mechs); 307 *minor_status = 0; 308 return GSS_S_BAD_MECH; 309 } 310 311 if (preferred_mech != NULL) { 312 ret = gss_duplicate_oid(minor_status, first_mech, preferred_mech); 313 if (ret != GSS_S_COMPLETE) 314 free_MechTypeList(mechtypelist); 315 } 316 gss_release_oid_set(minor_status, &supported_mechs); 317 318 return ret; 319} 320