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 35 /* 36 * Apparently Microsoft got the OID wrong, and used 37 * 1.2.840.48018.1.2.2 instead. We need both this and 38 * the correct Kerberos OID here in order to deal with 39 * this. Because this is manifest in SPNEGO only I'd 40 * prefer to deal with this here rather than inside the 41 * Kerberos mechanism. 42 */ 43 gss_OID_desc _gss_spnego_mskrb_mechanism_oid_desc = 44 {9, rk_UNCONST("\x2a\x86\x48\x82\xf7\x12\x01\x02\x02")}; 45 46 gss_OID_desc _gss_spnego_krb5_mechanism_oid_desc = 47 {9, rk_UNCONST("\x2a\x86\x48\x86\xf7\x12\x01\x02\x02")}; 48 49 /* 50 * Allocate a SPNEGO context handle 51 */ 52 OM_uint32 GSSAPI_CALLCONV 53 _gss_spnego_alloc_sec_context (OM_uint32 * minor_status, 54 gss_ctx_id_t *context_handle) 55 { 56 gssspnego_ctx ctx; 57 58 ctx = calloc(1, sizeof(*ctx)); 59 if (ctx == NULL) { 60 *minor_status = ENOMEM; 61 return GSS_S_FAILURE; 62 } 63 64 ctx->initiator_mech_types.len = 0; 65 ctx->initiator_mech_types.val = NULL; 66 ctx->preferred_mech_type = GSS_C_NO_OID; 67 ctx->negotiated_mech_type = GSS_C_NO_OID; 68 ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT; 69 70 /* 71 * Cache these so we can return them before returning 72 * GSS_S_COMPLETE, even if the mechanism has itself 73 * completed earlier 74 */ 75 ctx->mech_flags = 0; 76 ctx->mech_time_rec = 0; 77 ctx->mech_src_name = GSS_C_NO_NAME; 78 79 ctx->open = 0; 80 ctx->local = 0; 81 ctx->require_mic = 0; 82 ctx->verified_mic = 0; 83 84 HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex); 85 86 *context_handle = (gss_ctx_id_t)ctx; 87 88 return GSS_S_COMPLETE; 89 } 90 91 /* 92 * Free a SPNEGO context handle. The caller must have acquired 93 * the lock before this is called. 94 */ 95 OM_uint32 GSSAPI_CALLCONV _gss_spnego_internal_delete_sec_context 96 (OM_uint32 *minor_status, 97 gss_ctx_id_t *context_handle, 98 gss_buffer_t output_token 99 ) 100 { 101 gssspnego_ctx ctx; 102 OM_uint32 ret, minor; 103 104 *minor_status = 0; 105 106 if (context_handle == NULL) { 107 return GSS_S_NO_CONTEXT; 108 } 109 110 if (output_token != GSS_C_NO_BUFFER) { 111 output_token->length = 0; 112 output_token->value = NULL; 113 } 114 115 ctx = (gssspnego_ctx)*context_handle; 116 *context_handle = GSS_C_NO_CONTEXT; 117 118 if (ctx == NULL) { 119 return GSS_S_NO_CONTEXT; 120 } 121 122 if (ctx->initiator_mech_types.val != NULL) 123 free_MechTypeList(&ctx->initiator_mech_types); 124 125 gss_release_oid(&minor, &ctx->preferred_mech_type); 126 ctx->negotiated_mech_type = GSS_C_NO_OID; 127 128 gss_release_name(&minor, &ctx->target_name); 129 gss_release_name(&minor, &ctx->mech_src_name); 130 131 if (ctx->negotiated_ctx_id != GSS_C_NO_CONTEXT) { 132 ret = gss_delete_sec_context(minor_status, 133 &ctx->negotiated_ctx_id, 134 output_token); 135 ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT; 136 } else { 137 ret = GSS_S_COMPLETE; 138 } 139 140 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); 141 HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex); 142 143 free(ctx); 144 145 return ret; 146 } 147 148 /* 149 * For compatability with the Windows SPNEGO implementation, the 150 * default is to ignore the mechListMIC unless CFX is used and 151 * a non-preferred mechanism was negotiated 152 */ 153 154 OM_uint32 GSSAPI_CALLCONV 155 _gss_spnego_require_mechlist_mic(OM_uint32 *minor_status, 156 gssspnego_ctx ctx, 157 int *require_mic) 158 { 159 gss_buffer_set_t buffer_set = GSS_C_NO_BUFFER_SET; 160 OM_uint32 minor; 161 162 *minor_status = 0; 163 *require_mic = 0; 164 165 if (ctx == NULL) { 166 return GSS_S_COMPLETE; 167 } 168 169 if (ctx->require_mic) { 170 /* Acceptor requested it: mandatory to honour */ 171 *require_mic = 1; 172 return GSS_S_COMPLETE; 173 } 174 175 /* 176 * Check whether peer indicated implicit support for updated SPNEGO 177 * (eg. in the Kerberos case by using CFX) 178 */ 179 if (gss_inquire_sec_context_by_oid(&minor, ctx->negotiated_ctx_id, 180 GSS_C_PEER_HAS_UPDATED_SPNEGO, 181 &buffer_set) == GSS_S_COMPLETE) { 182 *require_mic = 1; 183 gss_release_buffer_set(&minor, &buffer_set); 184 } 185 186 /* Safe-to-omit MIC rules follow */ 187 if (*require_mic) { 188 if (gss_oid_equal(ctx->negotiated_mech_type, ctx->preferred_mech_type)) { 189 *require_mic = 0; 190 } else if (gss_oid_equal(ctx->negotiated_mech_type, &_gss_spnego_krb5_mechanism_oid_desc) && 191 gss_oid_equal(ctx->preferred_mech_type, &_gss_spnego_mskrb_mechanism_oid_desc)) { 192 *require_mic = 0; 193 } 194 } 195 196 return GSS_S_COMPLETE; 197 } 198 199 static int 200 add_mech_type(gss_OID mech_type, 201 int includeMSCompatOID, 202 MechTypeList *mechtypelist) 203 { 204 MechType mech; 205 int ret; 206 207 if (gss_oid_equal(mech_type, GSS_SPNEGO_MECHANISM)) 208 return 0; 209 210 if (includeMSCompatOID && 211 gss_oid_equal(mech_type, &_gss_spnego_krb5_mechanism_oid_desc)) { 212 ret = der_get_oid(_gss_spnego_mskrb_mechanism_oid_desc.elements, 213 _gss_spnego_mskrb_mechanism_oid_desc.length, 214 &mech, 215 NULL); 216 if (ret) 217 return ret; 218 ret = add_MechTypeList(mechtypelist, &mech); 219 free_MechType(&mech); 220 if (ret) 221 return ret; 222 } 223 ret = der_get_oid(mech_type->elements, mech_type->length, &mech, NULL); 224 if (ret) 225 return ret; 226 ret = add_MechTypeList(mechtypelist, &mech); 227 free_MechType(&mech); 228 return ret; 229 } 230 231 232 OM_uint32 GSSAPI_CALLCONV 233 _gss_spnego_indicate_mechtypelist (OM_uint32 *minor_status, 234 gss_name_t target_name, 235 OM_uint32 (*func)(gss_name_t, gss_OID), 236 int includeMSCompatOID, 237 const gss_cred_id_t cred_handle, 238 MechTypeList *mechtypelist, 239 gss_OID *preferred_mech) 240 { 241 gss_OID_set supported_mechs = GSS_C_NO_OID_SET; 242 gss_OID first_mech = GSS_C_NO_OID; 243 OM_uint32 ret; 244 size_t i; 245 246 mechtypelist->len = 0; 247 mechtypelist->val = NULL; 248 249 if (cred_handle) { 250 ret = gss_inquire_cred(minor_status, 251 cred_handle, 252 NULL, 253 NULL, 254 NULL, 255 &supported_mechs); 256 } else { 257 ret = gss_indicate_mechs(minor_status, &supported_mechs); 258 } 259 260 if (ret != GSS_S_COMPLETE) { 261 return ret; 262 } 263 264 if (supported_mechs->count == 0) { 265 *minor_status = ENOENT; 266 gss_release_oid_set(minor_status, &supported_mechs); 267 return GSS_S_FAILURE; 268 } 269 270 ret = (*func)(target_name, GSS_KRB5_MECHANISM); 271 if (ret == GSS_S_COMPLETE) { 272 ret = add_mech_type(GSS_KRB5_MECHANISM, 273 includeMSCompatOID, 274 mechtypelist); 275 if (!GSS_ERROR(ret)) 276 first_mech = GSS_KRB5_MECHANISM; 277 } 278 ret = GSS_S_COMPLETE; 279 280 for (i = 0; i < supported_mechs->count; i++) { 281 OM_uint32 subret; 282 if (gss_oid_equal(&supported_mechs->elements[i], GSS_SPNEGO_MECHANISM)) 283 continue; 284 if (gss_oid_equal(&supported_mechs->elements[i], GSS_KRB5_MECHANISM)) 285 continue; 286 287 subret = (*func)(target_name, &supported_mechs->elements[i]); 288 if (subret != GSS_S_COMPLETE) 289 continue; 290 291 ret = add_mech_type(&supported_mechs->elements[i], 292 includeMSCompatOID, 293 mechtypelist); 294 if (ret != 0) { 295 *minor_status = ret; 296 ret = GSS_S_FAILURE; 297 break; 298 } 299 if (first_mech == GSS_C_NO_OID) 300 first_mech = &supported_mechs->elements[i]; 301 } 302 303 if (mechtypelist->len == 0) { 304 gss_release_oid_set(minor_status, &supported_mechs); 305 *minor_status = 0; 306 return GSS_S_BAD_MECH; 307 } 308 309 if (preferred_mech != NULL) { 310 ret = gss_duplicate_oid(minor_status, first_mech, preferred_mech); 311 if (ret != GSS_S_COMPLETE) 312 free_MechTypeList(mechtypelist); 313 } 314 gss_release_oid_set(minor_status, &supported_mechs); 315 316 return ret; 317 } 318