mech_eap/init_sec_context.c

   1 /*
   2  * Copyright (c) 2010, JANET(UK)
   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 JANET(UK) 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND 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 THE COPYRIGHT HOLDER 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 "gssapiP_eap.h"
  34
  35 #ifdef GSSEAP_ENABLE_REAUTH
  36 static OM_uint32
  37 eapGssSmInitGssReauth(OM_uint32 *minor,
  38                       gss_cred_id_t cred,
  39                       gss_ctx_id_t ctx,
  40                       gss_name_t target,
  41                       gss_OID mech,
  42                       OM_uint32 reqFlags,
  43                       OM_uint32 timeReq,
  44                       gss_channel_bindings_t chanBindings,
  45                       gss_buffer_t inputToken,
  46                       gss_buffer_t outputToken);
  47 #endif
  48
  49 static OM_uint32
  50 policyVariableToFlag(enum eapol_bool_var variable)
  51 {
  52     OM_uint32 flag = 0;
  53
  54     switch (variable) {
  55     case EAPOL_eapSuccess:
  56         flag = CTX_FLAG_EAP_SUCCESS;
  57         break;
  58     case EAPOL_eapRestart:
  59         flag = CTX_FLAG_EAP_RESTART;
  60         break;
  61     case EAPOL_eapFail:
  62         flag = CTX_FLAG_EAP_FAIL;
  63         break;
  64     case EAPOL_eapResp:
  65         flag = CTX_FLAG_EAP_RESP;
  66         break;
  67     case EAPOL_eapNoResp:
  68         flag = CTX_FLAG_EAP_NO_RESP;
  69         break;
  70     case EAPOL_eapReq:
  71         flag = CTX_FLAG_EAP_REQ;
  72         break;
  73     case EAPOL_portEnabled:
  74         flag = CTX_FLAG_EAP_PORT_ENABLED;
  75         break;
  76     case EAPOL_altAccept:
  77         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  78         break;
  79     case EAPOL_altReject:
  80         flag = CTX_FLAG_EAP_ALT_REJECT;
  81         break;
  82     }
  83
  84     return flag;
  85 }
  86
  87 static struct eap_peer_config *
  88 peerGetConfig(void *ctx)
  89 {
  90     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  91
  92     return &gssCtx->initiatorCtx.eapPeerConfig;
  93 }
  94
  95 static Boolean
  96 peerGetBool(void *data, enum eapol_bool_var variable)
  97 {
  98     gss_ctx_id_t ctx = data;
  99     OM_uint32 flag;
 100
 101     if (ctx == GSS_C_NO_CONTEXT)
 102         return FALSE;
 103
 104     flag = policyVariableToFlag(variable);
 105
 106     return ((ctx->flags & flag) != 0);
 107 }
 108
 109 static void
 110 peerSetBool(void *data, enum eapol_bool_var variable,
 111             Boolean value)
 112 {
 113     gss_ctx_id_t ctx = data;
 114     OM_uint32 flag;
 115
 116     if (ctx == GSS_C_NO_CONTEXT)
 117         return;
 118
 119     flag = policyVariableToFlag(variable);
 120
 121     if (value)
 122         ctx->flags |= flag;
 123     else
 124         ctx->flags &= ~(flag);
 125 }
 126
 127 static unsigned int
 128 peerGetInt(void *data, enum eapol_int_var variable)
 129 {
 130     gss_ctx_id_t ctx = data;
 131
 132     if (ctx == GSS_C_NO_CONTEXT)
 133         return FALSE;
 134
 135     assert(CTX_IS_INITIATOR(ctx));
 136
 137     switch (variable) {
 138     case EAPOL_idleWhile:
 139         return ctx->initiatorCtx.idleWhile;
 140         break;
 141     }
 142
 143     return 0;
 144 }
 145
 146 static void
 147 peerSetInt(void *data, enum eapol_int_var variable,
 148            unsigned int value)
 149 {
 150     gss_ctx_id_t ctx = data;
 151
 152     if (ctx == GSS_C_NO_CONTEXT)
 153         return;
 154
 155     assert(CTX_IS_INITIATOR(ctx));
 156
 157     switch (variable) {
 158     case EAPOL_idleWhile:
 159         ctx->initiatorCtx.idleWhile = value;
 160         break;
 161     }
 162 }
 163
 164 static struct wpabuf *
 165 peerGetEapReqData(void *ctx)
 166 {
 167     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 168
 169     return &gssCtx->initiatorCtx.reqData;
 170 }
 171
 172 static void
 173 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 174 {
 175 }
 176
 177 static const struct wpa_config_blob *
 178 peerGetConfigBlob(void *ctx, const char *name)
 179 {
 180     return NULL;
 181 }
 182
 183 static void
 184 peerNotifyPending(void *ctx)
 185 {
 186 }
 187
 188 static struct eapol_callbacks gssEapPolicyCallbacks = {
 189     peerGetConfig,
 190     peerGetBool,
 191     peerSetBool,
 192     peerGetInt,
 193     peerSetInt,
 194     peerGetEapReqData,
 195     peerSetConfigBlob,
 196     peerGetConfigBlob,
 197     peerNotifyPending,
 198 };
 199
 200 extern int wpa_debug_level;
 201
 202 static OM_uint32
 203 peerConfigInit(OM_uint32 *minor,
 204                gss_cred_id_t cred,
 205                gss_ctx_id_t ctx)
 206 {
 207     krb5_context krbContext;
 208     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 209     krb5_error_code code;
 210     char *identity;
 211
 212     eapPeerConfig->identity = NULL;
 213     eapPeerConfig->identity_len = 0;
 214     eapPeerConfig->password = NULL;
 215     eapPeerConfig->password_len = 0;
 216
 217     assert(cred != GSS_C_NO_CREDENTIAL);
 218
 219     GSSEAP_KRB_INIT(&krbContext);
 220
 221     eapPeerConfig->fragment_size = 1024;
 222     wpa_debug_level = 0;
 223
 224     assert(cred->name != GSS_C_NO_NAME);
 225
 226     if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
 227         *minor = GSSEAP_BAD_INITIATOR_NAME;
 228         return GSS_S_BAD_NAME;
 229     }
 230
 231     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 232     if (code != 0) {
 233         *minor = code;
 234         return GSS_S_FAILURE;
 235     }
 236
 237     eapPeerConfig->identity = (unsigned char *)identity;
 238     eapPeerConfig->identity_len = strlen(identity);
 239     eapPeerConfig->password = (unsigned char *)cred->password.value;
 240     eapPeerConfig->password_len = cred->password.length;
 241
 242     *minor = 0;
 243     return GSS_S_COMPLETE;
 244 }
 245
 246 static OM_uint32
 247 peerConfigFree(OM_uint32 *minor,
 248                gss_ctx_id_t ctx)
 249 {
 250     krb5_context krbContext;
 251     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 252
 253     GSSEAP_KRB_INIT(&krbContext);
 254
 255     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 256
 257     *minor = 0;
 258     return GSS_S_COMPLETE;
 259 }
 260
 261 /*
 262  * Mark an initiator context as ready for cryptographic operations
 263  */
 264 static OM_uint32
 265 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 266 {
 267     OM_uint32 major;
 268     const unsigned char *key;
 269     size_t keyLength;
 270
 271 #if 1
 272     /* XXX actually check for mutual auth */
 273     if (reqFlags & GSS_C_MUTUAL_FLAG)
 274         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 275 #endif
 276
 277     /* Cache encryption type derived from selected mechanism OID */
 278     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 279     if (GSS_ERROR(major))
 280         return major;
 281
 282     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 283         *minor = GSSEAP_KEY_UNAVAILABLE;
 284         return GSS_S_UNAVAILABLE;
 285     }
 286
 287     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 288
 289     if (keyLength < EAP_EMSK_LEN) {
 290         *minor = GSSEAP_KEY_TOO_SHORT;
 291         return GSS_S_UNAVAILABLE;
 292     }
 293
 294     major = gssEapDeriveRfc3961Key(minor,
 295                                    &key[EAP_EMSK_LEN / 2],
 296                                    EAP_EMSK_LEN / 2,
 297                                    ctx->encryptionType,
 298                                    &ctx->rfc3961Key);
 299        if (GSS_ERROR(major))
 300            return major;
 301
 302     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 303                                       &ctx->checksumType);
 304     if (GSS_ERROR(major))
 305         return major;
 306
 307     major = sequenceInit(minor,
 308                          &ctx->seqState,
 309                          ctx->recvSeq,
 310                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 311                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 312                          TRUE);
 313     if (GSS_ERROR(major))
 314         return major;
 315
 316     *minor = 0;
 317     return GSS_S_COMPLETE;
 318 }
 319
 320 static OM_uint32
 321 initBegin(OM_uint32 *minor,
 322           gss_cred_id_t cred,
 323           gss_ctx_id_t ctx,
 324           gss_name_t target,
 325           gss_OID mech,
 326           OM_uint32 reqFlags,
 327           OM_uint32 timeReq,
 328           gss_channel_bindings_t chanBindings,
 329           gss_buffer_t inputToken,
 330           gss_buffer_t outputToken)
 331 {
 332     OM_uint32 major;
 333
 334     assert(cred != GSS_C_NO_CREDENTIAL);
 335
 336     if (cred->expiryTime)
 337         ctx->expiryTime = cred->expiryTime;
 338     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 339         ctx->expiryTime = 0;
 340     else
 341         ctx->expiryTime = time(NULL) + timeReq;
 342
 343     /*
 344      * The credential mutex protects its name, however we need to
 345      * explicitly lock the acceptor name (unlikely as it may be
 346      * that it has attributes set on it).
 347      */
 348     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 349     if (GSS_ERROR(major))
 350         return major;
 351
 352     GSSEAP_MUTEX_LOCK(&target->mutex);
 353
 354     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 355     if (GSS_ERROR(major)) {
 356         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 357         return major;
 358     }
 359
 360     GSSEAP_MUTEX_UNLOCK(&target->mutex);
 361
 362     if (mech == GSS_C_NULL_OID) {
 363         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 364     } else if (gssEapIsConcreteMechanismOid(mech)) {
 365         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 366             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 367     } else {
 368         *minor = GSSEAP_WRONG_MECH;
 369         major = GSS_S_BAD_MECH;
 370     }
 371     if (GSS_ERROR(major))
 372         return major;
 373
 374     /* If credentials were provided, check they're usable with this mech */
 375     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 376         *minor = GSSEAP_CRED_MECH_MISMATCH;
 377         return GSS_S_BAD_MECH;
 378     }
 379
 380     *minor = 0;
 381     return GSS_S_COMPLETE;
 382 }
 383
 384 static OM_uint32
 385 eapGssSmInitIdentity(OM_uint32 *minor,
 386                      gss_cred_id_t cred,
 387                      gss_ctx_id_t ctx,
 388                      gss_name_t target,
 389                      gss_OID mech,
 390                      OM_uint32 reqFlags,
 391                      OM_uint32 timeReq,
 392                      gss_channel_bindings_t chanBindings,
 393                      gss_buffer_t inputToken,
 394                      gss_buffer_t outputToken)
 395 {
 396     OM_uint32 major;
 397     int initialContextToken;
 398
 399     initialContextToken = (inputToken->length == 0);
 400     if (!initialContextToken) {
 401         *minor = GSSEAP_WRONG_SIZE;
 402         return GSS_S_DEFECTIVE_TOKEN;
 403     }
 404
 405     major = initBegin(minor, cred, ctx, target, mech,
 406                       reqFlags, timeReq, chanBindings,
 407                       inputToken, outputToken);
 408     if (GSS_ERROR(major))
 409         return major;
 410
 411     ctx->state = EAP_STATE_AUTHENTICATE;
 412
 413     *minor = 0;
 414     return GSS_S_CONTINUE_NEEDED;
 415 }
 416
 417 static struct wpabuf emptyWpaBuffer;
 418
 419 static OM_uint32
 420 eapGssSmInitAuthenticate(OM_uint32 *minor,
 421                          gss_cred_id_t cred,
 422                          gss_ctx_id_t ctx,
 423                          gss_name_t target,
 424                          gss_OID mech,
 425                          OM_uint32 reqFlags,
 426                          OM_uint32 timeReq,
 427                          gss_channel_bindings_t chanBindings,
 428                          gss_buffer_t inputToken,
 429                          gss_buffer_t outputToken)
 430 {
 431     OM_uint32 major;
 432     OM_uint32 tmpMinor;
 433     int code;
 434     struct wpabuf *resp = NULL;
 435     int initialContextToken;
 436
 437     *minor = 0;
 438
 439     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 440                            inputToken->length == 0);
 441
 442     major = peerConfigInit(minor, cred, ctx);
 443     if (GSS_ERROR(major))
 444         goto cleanup;
 445
 446     if (ctx->initiatorCtx.eap == NULL) {
 447         struct eap_config eapConfig;
 448
 449         memset(&eapConfig, 0, sizeof(eapConfig));
 450
 451         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 452                                                  &gssEapPolicyCallbacks,
 453                                                  ctx,
 454                                                  &eapConfig);
 455         if (ctx->initiatorCtx.eap == NULL) {
 456             *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 457             major = GSS_S_FAILURE;
 458             goto cleanup;
 459         }
 460
 461         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 462     }
 463
 464     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 465
 466     wpabuf_set(&ctx->initiatorCtx.reqData,
 467                inputToken->value, inputToken->length);
 468
 469     major = GSS_S_CONTINUE_NEEDED;
 470
 471     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 472     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 473         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 474
 475         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 476     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 477         major = initReady(minor, ctx, reqFlags);
 478         if (GSS_ERROR(major))
 479             goto cleanup;
 480
 481         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 482         major = GSS_S_CONTINUE_NEEDED;
 483         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 484     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 485         *minor = GSSEAP_PEER_AUTH_FAILURE;
 486         major = GSS_S_DEFECTIVE_CREDENTIAL;
 487     } else if (code == 0 && initialContextToken) {
 488         resp = &emptyWpaBuffer;
 489         major = GSS_S_CONTINUE_NEEDED;
 490     } else {
 491         *minor = GSSEAP_PEER_BAD_MESSAGE;
 492         major = GSS_S_DEFECTIVE_TOKEN;
 493     }
 494
 495 cleanup:
 496     if (resp != NULL) {
 497         OM_uint32 tmpMajor;
 498         gss_buffer_desc respBuf;
 499
 500         assert(major == GSS_S_CONTINUE_NEEDED);
 501
 502         respBuf.length = wpabuf_len(resp);
 503         respBuf.value = (void *)wpabuf_head(resp);
 504
 505         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 506         if (GSS_ERROR(tmpMajor)) {
 507             major = tmpMajor;
 508             *minor = tmpMinor;
 509         }
 510     }
 511
 512     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 513     peerConfigFree(&tmpMinor, ctx);
 514
 515     return major;
 516 }
 517
 518 static OM_uint32
 519 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 520                           gss_cred_id_t cred,
 521                           gss_ctx_id_t ctx,
 522                           gss_name_t target,
 523                           gss_OID mech,
 524                           OM_uint32 reqFlags,
 525                           OM_uint32 timeReq,
 526                           gss_channel_bindings_t chanBindings,
 527                           gss_buffer_t inputToken,
 528                           gss_buffer_t outputToken)
 529 {
 530     OM_uint32 major;
 531
 532     major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
 533     if (GSS_ERROR(major))
 534         return major;
 535
 536     assert(outputToken->value != NULL);
 537
 538     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 539
 540     *minor = 0;
 541     return GSS_S_CONTINUE_NEEDED;
 542 }
 543
 544 static OM_uint32
 545 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 546                            gss_cred_id_t cred,
 547                            gss_ctx_id_t ctx,
 548                            gss_name_t target,
 549                            gss_OID mech,
 550                            OM_uint32 reqFlags,
 551                            OM_uint32 timeReq,
 552                            gss_channel_bindings_t chanBindings,
 553                            gss_buffer_t inputToken,
 554                            gss_buffer_t outputToken)
 555 {
 556     OM_uint32 major;
 557
 558     major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
 559     if (GSS_ERROR(major))
 560         return major;
 561
 562     ctx->state = EAP_STATE_ESTABLISHED;
 563
 564     *minor = 0;
 565     return GSS_S_COMPLETE;
 566 }
 567
 568 static OM_uint32
 569 eapGssSmInitEstablished(OM_uint32 *minor,
 570                         gss_cred_id_t cred,
 571                         gss_ctx_id_t ctx,
 572                         gss_name_t target,
 573                         gss_OID mech,
 574                         OM_uint32 reqFlags,
 575                         OM_uint32 timeReq,
 576                         gss_channel_bindings_t chanBindings,
 577                         gss_buffer_t inputToken,
 578                         gss_buffer_t outputToken)
 579 {
 580     /* Called with already established context */
 581     *minor = GSSEAP_CONTEXT_ESTABLISHED;
 582     return GSS_S_BAD_STATUS;
 583 }
 584
 585 static OM_uint32
 586 eapGssSmInitError(OM_uint32 *minor,
 587                   gss_cred_id_t cred,
 588                   gss_ctx_id_t ctx,
 589                   gss_name_t target,
 590                   gss_OID mech,
 591                   OM_uint32 reqFlags,
 592                   OM_uint32 timeReq,
 593                   gss_channel_bindings_t chanBindings,
 594                   gss_buffer_t inputToken,
 595                   gss_buffer_t outputToken)
 596 {
 597     OM_uint32 major;
 598     unsigned char *p;
 599
 600     if (inputToken->length < 8) {
 601         *minor = GSSEAP_TOK_TRUNC;
 602         return GSS_S_DEFECTIVE_TOKEN;
 603     }
 604
 605     p = (unsigned char *)inputToken->value;
 606
 607     major = load_uint32_be(&p[0]);
 608     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 609
 610     if (!GSS_ERROR(major)) {
 611         *minor = GSSEAP_BAD_ERROR_TOKEN;
 612         major = GSS_S_FAILURE;
 613     }
 614
 615     return major;
 616 }
 617
 618 static struct gss_eap_initiator_sm {
 619     enum gss_eap_token_type inputTokenType;
 620     enum gss_eap_token_type outputTokenType;
 621     OM_uint32 (*processToken)(OM_uint32 *,
 622                               gss_cred_id_t,
 623                               gss_ctx_id_t,
 624                               gss_name_t,
 625                               gss_OID,
 626                               OM_uint32,
 627                               OM_uint32,
 628                               gss_channel_bindings_t,
 629                               gss_buffer_t,
 630                               gss_buffer_t);
 631 } eapGssInitiatorSm[] = {
 632     { TOK_TYPE_NONE,        TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 633     { TOK_TYPE_EAP_REQ,     TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 634     { TOK_TYPE_NONE,        TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 635     { TOK_TYPE_EXT_RESP,    TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 636     { TOK_TYPE_NONE,        TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 637     { TOK_TYPE_CONTEXT_ERR, TOK_TYPE_NONE,          eapGssSmInitError               },
 638 #ifdef GSSEAP_ENABLE_REAUTH
 639     { TOK_TYPE_GSS_REAUTH,  TOK_TYPE_GSS_REAUTH,    eapGssSmInitGssReauth           },
 640 #endif
 641 };
 642
 643 OM_uint32
 644 gss_init_sec_context(OM_uint32 *minor,
 645                      gss_cred_id_t cred,
 646                      gss_ctx_id_t *context_handle,
 647                      gss_name_t target_name,
 648                      gss_OID mech_type,
 649                      OM_uint32 req_flags,
 650                      OM_uint32 time_req,
 651                      gss_channel_bindings_t input_chan_bindings,
 652                      gss_buffer_t input_token,
 653                      gss_OID *actual_mech_type,
 654                      gss_buffer_t output_token,
 655                      OM_uint32 *ret_flags,
 656                      OM_uint32 *time_rec)
 657 {
 658     OM_uint32 major;
 659     OM_uint32 tmpMajor, tmpMinor;
 660     gss_ctx_id_t ctx = *context_handle;
 661     struct gss_eap_initiator_sm *sm = NULL;
 662     gss_buffer_desc innerInputToken;
 663     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 664     enum gss_eap_token_type tokType;
 665     gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
 666     int initialContextToken = 0;
 667
 668     *minor = 0;
 669
 670     output_token->length = 0;
 671     output_token->value = NULL;
 672
 673     if (ctx == GSS_C_NO_CONTEXT) {
 674         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 675             *minor = GSSEAP_WRONG_SIZE;
 676             return GSS_S_DEFECTIVE_TOKEN;
 677         }
 678
 679         major = gssEapAllocContext(minor, &ctx);
 680         if (GSS_ERROR(major))
 681             return major;
 682
 683         ctx->flags |= CTX_FLAG_INITIATOR;
 684
 685         initialContextToken = 1;
 686         *context_handle = ctx;
 687     }
 688
 689     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 690
 691     if (cred == GSS_C_NO_CREDENTIAL) {
 692         if (ctx->initiatorCtx.defaultCred == GSS_C_NO_CREDENTIAL) {
 693             major = gssEapAcquireCred(minor,
 694                                       GSS_C_NO_NAME,
 695                                       GSS_C_NO_BUFFER,
 696                                       time_req,
 697                                       GSS_C_NO_OID_SET,
 698                                       GSS_C_INITIATE,
 699                                       &defaultCred,
 700                                       NULL,
 701                                       NULL);
 702             if (GSS_ERROR(major))
 703                 goto cleanup;
 704         }
 705
 706         cred = ctx->initiatorCtx.defaultCred;
 707     }
 708
 709     GSSEAP_MUTEX_LOCK(&cred->mutex);
 710
 711 #ifdef GSSEAP_ENABLE_REAUTH
 712     if (initialContextToken && gssEapCanReauthP(cred, target_name, time_req))
 713         ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 714 #endif
 715
 716     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 717         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 718         major = GSS_S_NO_CRED;
 719         goto cleanup;
 720     }
 721
 722     sm = &eapGssInitiatorSm[ctx->state];
 723
 724     if (input_token != GSS_C_NO_BUFFER) {
 725         major = gssEapVerifyToken(minor, ctx, input_token,
 726                                   &tokType, &innerInputToken);
 727         if (GSS_ERROR(major))
 728             goto cleanup;
 729
 730         if (tokType == TOK_TYPE_CONTEXT_ERR) {
 731             ctx->state = EAP_STATE_ERROR;
 732         } else if (tokType != sm->inputTokenType) {
 733             *minor = GSSEAP_WRONG_TOK_ID;
 734             major = GSS_S_DEFECTIVE_TOKEN;
 735             goto cleanup;
 736         }
 737     } else {
 738         innerInputToken.length = 0;
 739         innerInputToken.value = NULL;
 740     }
 741
 742     /*
 743      * Advance through state machine whilst empty tokens are emitted and
 744      * the status is not GSS_S_COMPLETE or an error status.
 745      */
 746     do {
 747         sm = &eapGssInitiatorSm[ctx->state];
 748
 749         major = (sm->processToken)(minor,
 750                                    cred,
 751                                    ctx,
 752                                    target_name,
 753                                    mech_type,
 754                                    req_flags,
 755                                    time_req,
 756                                    input_chan_bindings,
 757                                    &innerInputToken,
 758                                    &innerOutputToken);
 759         if (GSS_ERROR(major))
 760             goto cleanup;
 761     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 762
 763     if (actual_mech_type != NULL) {
 764         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 765             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 766     }
 767     if (innerOutputToken.value != NULL) {
 768         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 769                                    sm->outputTokenType, output_token);
 770         if (GSS_ERROR(tmpMajor)) {
 771             major = tmpMajor;
 772             *minor = tmpMinor;
 773             goto cleanup;
 774         }
 775     }
 776     if (ret_flags != NULL)
 777         *ret_flags = ctx->gssFlags;
 778     if (time_rec != NULL)
 779         gssEapContextTime(&tmpMinor, ctx, time_rec);
 780
 781     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 782
 783 cleanup:
 784     if (cred != GSS_C_NO_CREDENTIAL)
 785         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 786     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 787
 788     if (GSS_ERROR(major))
 789         gssEapReleaseContext(&tmpMinor, context_handle);
 790
 791     gss_release_buffer(&tmpMinor, &innerOutputToken);
 792
 793     return major;
 794 }
 795
 796 #ifdef GSSEAP_ENABLE_REAUTH
 797 static OM_uint32
 798 eapGssSmInitGssReauth(OM_uint32 *minor,
 799                       gss_cred_id_t cred,
 800                       gss_ctx_id_t ctx,
 801                       gss_name_t target,
 802                       gss_OID mech,
 803                       OM_uint32 reqFlags,
 804                       OM_uint32 timeReq,
 805                       gss_channel_bindings_t chanBindings,
 806                       gss_buffer_t inputToken,
 807                       gss_buffer_t outputToken)
 808 {
 809     OM_uint32 major, tmpMinor;
 810     gss_name_t mechTarget = GSS_C_NO_NAME;
 811     gss_OID actualMech = GSS_C_NO_OID;
 812     OM_uint32 gssFlags, timeRec;
 813
 814     assert(cred != GSS_C_NO_CREDENTIAL);
 815
 816     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 817
 818     if (inputToken->length == 0) {
 819         major = initBegin(minor, cred, ctx, target, mech,
 820                           reqFlags, timeReq, chanBindings,
 821                           inputToken, outputToken);
 822         if (GSS_ERROR(major))
 823             goto cleanup;
 824     }
 825
 826     major = gssEapMechToGlueName(minor, target, &mechTarget);
 827     if (GSS_ERROR(major))
 828         goto cleanup;
 829
 830     major = gssInitSecContext(minor,
 831                               cred->krbCred,
 832                               &ctx->kerberosCtx,
 833                               mechTarget,
 834                               (gss_OID)gss_mech_krb5,
 835                               reqFlags, /* | GSS_C_DCE_STYLE, */
 836                               timeReq,
 837                               chanBindings,
 838                               inputToken,
 839                               &actualMech,
 840                               outputToken,
 841                               &gssFlags,
 842                               &timeRec);
 843     if (GSS_ERROR(major))
 844         goto cleanup;
 845
 846     ctx->gssFlags = gssFlags;
 847
 848     if (major == GSS_S_COMPLETE) {
 849         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 850         if (GSS_ERROR(major))
 851             goto cleanup;
 852         ctx->state = EAP_STATE_ESTABLISHED;
 853     }
 854
 855 cleanup:
 856     gssReleaseName(&tmpMinor, &mechTarget);
 857
 858     return major;
 859 }
 860 #endif /* GSSEAP_ENABLE_REAUTH */