init_sec_context.c

   1 /*
   2  * Copyright (c) 2011, 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 /*
  34  * Establish a security context on the initiator (client). These functions
  35  * wrap around libeap.
  36  */
  37
  38 #include "gssapiP_eap.h"
  39
  40 #ifdef GSSEAP_ENABLE_REAUTH
  41 static OM_uint32
  42 eapGssSmInitGssReauth(OM_uint32 *minor,
  43                       gss_cred_id_t cred,
  44                       gss_ctx_id_t ctx,
  45                       gss_name_t target,
  46                       gss_OID mech,
  47                       OM_uint32 reqFlags,
  48                       OM_uint32 timeReq,
  49                       gss_channel_bindings_t chanBindings,
  50                       gss_buffer_t inputToken,
  51                       gss_buffer_t outputToken);
  52 #endif
  53
  54 static OM_uint32
  55 policyVariableToFlag(enum eapol_bool_var variable)
  56 {
  57     OM_uint32 flag = 0;
  58
  59     switch (variable) {
  60     case EAPOL_eapSuccess:
  61         flag = CTX_FLAG_EAP_SUCCESS;
  62         break;
  63     case EAPOL_eapRestart:
  64         flag = CTX_FLAG_EAP_RESTART;
  65         break;
  66     case EAPOL_eapFail:
  67         flag = CTX_FLAG_EAP_FAIL;
  68         break;
  69     case EAPOL_eapResp:
  70         flag = CTX_FLAG_EAP_RESP;
  71         break;
  72     case EAPOL_eapNoResp:
  73         flag = CTX_FLAG_EAP_NO_RESP;
  74         break;
  75     case EAPOL_eapReq:
  76         flag = CTX_FLAG_EAP_REQ;
  77         break;
  78     case EAPOL_portEnabled:
  79         flag = CTX_FLAG_EAP_PORT_ENABLED;
  80         break;
  81     case EAPOL_altAccept:
  82         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  83         break;
  84     case EAPOL_altReject:
  85         flag = CTX_FLAG_EAP_ALT_REJECT;
  86         break;
  87     }
  88
  89     return flag;
  90 }
  91
  92 static struct eap_peer_config *
  93 peerGetConfig(void *ctx)
  94 {
  95     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  96
  97     return &gssCtx->initiatorCtx.eapPeerConfig;
  98 }
  99
 100 static Boolean
 101 peerGetBool(void *data, enum eapol_bool_var variable)
 102 {
 103     gss_ctx_id_t ctx = data;
 104     OM_uint32 flag;
 105
 106     if (ctx == GSS_C_NO_CONTEXT)
 107         return FALSE;
 108
 109     flag = policyVariableToFlag(variable);
 110
 111     return ((ctx->flags & flag) != 0);
 112 }
 113
 114 static void
 115 peerSetBool(void *data, enum eapol_bool_var variable,
 116             Boolean value)
 117 {
 118     gss_ctx_id_t ctx = data;
 119     OM_uint32 flag;
 120
 121     if (ctx == GSS_C_NO_CONTEXT)
 122         return;
 123
 124     flag = policyVariableToFlag(variable);
 125
 126     if (value)
 127         ctx->flags |= flag;
 128     else
 129         ctx->flags &= ~(flag);
 130 }
 131
 132 static unsigned int
 133 peerGetInt(void *data, enum eapol_int_var variable)
 134 {
 135     gss_ctx_id_t ctx = data;
 136
 137     if (ctx == GSS_C_NO_CONTEXT)
 138         return FALSE;
 139
 140     assert(CTX_IS_INITIATOR(ctx));
 141
 142     switch (variable) {
 143     case EAPOL_idleWhile:
 144         return ctx->initiatorCtx.idleWhile;
 145         break;
 146     }
 147
 148     return 0;
 149 }
 150
 151 static void
 152 peerSetInt(void *data, enum eapol_int_var variable,
 153            unsigned int value)
 154 {
 155     gss_ctx_id_t ctx = data;
 156
 157     if (ctx == GSS_C_NO_CONTEXT)
 158         return;
 159
 160     assert(CTX_IS_INITIATOR(ctx));
 161
 162     switch (variable) {
 163     case EAPOL_idleWhile:
 164         ctx->initiatorCtx.idleWhile = value;
 165         break;
 166     }
 167 }
 168
 169 static struct wpabuf *
 170 peerGetEapReqData(void *ctx)
 171 {
 172     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 173
 174     return &gssCtx->initiatorCtx.reqData;
 175 }
 176
 177 static void
 178 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 179 {
 180 }
 181
 182 static const struct wpa_config_blob *
 183 peerGetConfigBlob(void *ctx, const char *name)
 184 {
 185     return NULL;
 186 }
 187
 188 static void
 189 peerNotifyPending(void *ctx)
 190 {
 191 }
 192
 193 static struct eapol_callbacks gssEapPolicyCallbacks = {
 194     peerGetConfig,
 195     peerGetBool,
 196     peerSetBool,
 197     peerGetInt,
 198     peerSetInt,
 199     peerGetEapReqData,
 200     peerSetConfigBlob,
 201     peerGetConfigBlob,
 202     peerNotifyPending,
 203 };
 204
 205 #ifdef GSSEAP_DEBUG
 206 extern int wpa_debug_level;
 207 #endif
 208
 209 static OM_uint32
 210 peerConfigInit(OM_uint32 *minor,
 211                gss_cred_id_t cred,
 212                gss_ctx_id_t ctx)
 213 {
 214     krb5_context krbContext;
 215     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 216     krb5_error_code code;
 217     char *identity, *anonymousIdentity;
 218
 219     eapPeerConfig->identity = NULL;
 220     eapPeerConfig->identity_len = 0;
 221     eapPeerConfig->password = NULL;
 222     eapPeerConfig->password_len = 0;
 223
 224     assert(cred != GSS_C_NO_CREDENTIAL);
 225
 226     GSSEAP_KRB_INIT(&krbContext);
 227
 228     eapPeerConfig->fragment_size = 1024;
 229 #ifdef GSSEAP_DEBUG
 230     wpa_debug_level = 0;
 231 #endif
 232
 233     assert(cred->name != GSS_C_NO_NAME);
 234
 235     if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
 236         *minor = GSSEAP_BAD_INITIATOR_NAME;
 237         return GSS_S_BAD_NAME;
 238     }
 239
 240     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 241     if (code != 0) {
 242         *minor = code;
 243         return GSS_S_FAILURE;
 244     }
 245
 246     anonymousIdentity = strchr(identity, '@');
 247     if (anonymousIdentity == NULL)
 248         anonymousIdentity = "";
 249
 250     eapPeerConfig->identity = (unsigned char *)identity;
 251     eapPeerConfig->identity_len = strlen(identity);
 252     eapPeerConfig->anonymous_identity = (unsigned char *)anonymousIdentity;
 253     eapPeerConfig->anonymous_identity_len = strlen(anonymousIdentity);
 254     eapPeerConfig->password = (unsigned char *)cred->password.value;
 255     eapPeerConfig->password_len = cred->password.length;
 256
 257     *minor = 0;
 258     return GSS_S_COMPLETE;
 259 }
 260
 261 static OM_uint32
 262 peerConfigFree(OM_uint32 *minor,
 263                gss_ctx_id_t ctx)
 264 {
 265     krb5_context krbContext;
 266     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 267
 268     GSSEAP_KRB_INIT(&krbContext);
 269
 270     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 271
 272     *minor = 0;
 273     return GSS_S_COMPLETE;
 274 }
 275
 276 /*
 277  * Mark an initiator context as ready for cryptographic operations
 278  */
 279 static OM_uint32
 280 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 281 {
 282     OM_uint32 major;
 283     const unsigned char *key;
 284     size_t keyLength;
 285
 286 #if 1
 287     /* XXX actually check for mutual auth */
 288     if (reqFlags & GSS_C_MUTUAL_FLAG)
 289         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 290 #endif
 291
 292     /* Cache encryption type derived from selected mechanism OID */
 293     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 294     if (GSS_ERROR(major))
 295         return major;
 296
 297     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 298         *minor = GSSEAP_KEY_UNAVAILABLE;
 299         return GSS_S_UNAVAILABLE;
 300     }
 301
 302     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 303
 304     if (keyLength < EAP_EMSK_LEN) {
 305         *minor = GSSEAP_KEY_TOO_SHORT;
 306         return GSS_S_UNAVAILABLE;
 307     }
 308
 309     major = gssEapDeriveRfc3961Key(minor,
 310                                    &key[EAP_EMSK_LEN / 2],
 311                                    EAP_EMSK_LEN / 2,
 312                                    ctx->encryptionType,
 313                                    &ctx->rfc3961Key);
 314        if (GSS_ERROR(major))
 315            return major;
 316
 317     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 318                                       &ctx->checksumType);
 319     if (GSS_ERROR(major))
 320         return major;
 321
 322     major = sequenceInit(minor,
 323                          &ctx->seqState,
 324                          ctx->recvSeq,
 325                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 326                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 327                          TRUE);
 328     if (GSS_ERROR(major))
 329         return major;
 330
 331     *minor = 0;
 332     return GSS_S_COMPLETE;
 333 }
 334
 335 static OM_uint32
 336 initBegin(OM_uint32 *minor,
 337           gss_cred_id_t cred,
 338           gss_ctx_id_t ctx,
 339           gss_name_t target,
 340           gss_OID mech,
 341           OM_uint32 reqFlags,
 342           OM_uint32 timeReq,
 343           gss_channel_bindings_t chanBindings,
 344           gss_buffer_t inputToken,
 345           gss_buffer_t outputToken)
 346 {
 347     OM_uint32 major;
 348
 349     assert(cred != GSS_C_NO_CREDENTIAL);
 350
 351     if (cred->expiryTime)
 352         ctx->expiryTime = cred->expiryTime;
 353     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 354         ctx->expiryTime = 0;
 355     else
 356         ctx->expiryTime = time(NULL) + timeReq;
 357
 358     /*
 359      * The credential mutex protects its name, however we need to
 360      * explicitly lock the acceptor name (unlikely as it may be
 361      * that it has attributes set on it).
 362      */
 363     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 364     if (GSS_ERROR(major))
 365         return major;
 366
 367     GSSEAP_MUTEX_LOCK(&target->mutex);
 368
 369     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 370     if (GSS_ERROR(major)) {
 371         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 372         return major;
 373     }
 374
 375     GSSEAP_MUTEX_UNLOCK(&target->mutex);
 376
 377     if (mech == GSS_C_NULL_OID) {
 378         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 379     } else if (gssEapIsConcreteMechanismOid(mech)) {
 380         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 381             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 382     } else {
 383         major = GSS_S_BAD_MECH;
 384         *minor = GSSEAP_WRONG_MECH;
 385     }
 386     if (GSS_ERROR(major))
 387         return major;
 388
 389     /* If credentials were provided, check they're usable with this mech */
 390     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 391         *minor = GSSEAP_CRED_MECH_MISMATCH;
 392         return GSS_S_BAD_MECH;
 393     }
 394
 395     *minor = 0;
 396     return GSS_S_COMPLETE;
 397 }
 398
 399 static OM_uint32
 400 eapGssSmInitIdentity(OM_uint32 *minor,
 401                      gss_cred_id_t cred,
 402                      gss_ctx_id_t ctx,
 403                      gss_name_t target,
 404                      gss_OID mech,
 405                      OM_uint32 reqFlags,
 406                      OM_uint32 timeReq,
 407                      gss_channel_bindings_t chanBindings,
 408                      gss_buffer_t inputToken,
 409                      gss_buffer_t outputToken)
 410 {
 411     OM_uint32 major;
 412     int initialContextToken;
 413
 414     initialContextToken = (inputToken->length == 0);
 415     if (!initialContextToken) {
 416         *minor = GSSEAP_WRONG_SIZE;
 417         return GSS_S_DEFECTIVE_TOKEN;
 418     }
 419
 420     major = initBegin(minor, cred, ctx, target, mech,
 421                       reqFlags, timeReq, chanBindings,
 422                       inputToken, outputToken);
 423     if (GSS_ERROR(major))
 424         return major;
 425
 426     ctx->state = GSSEAP_STATE_AUTHENTICATE;
 427
 428     *minor = 0;
 429     return GSS_S_CONTINUE_NEEDED;
 430 }
 431
 432 static struct wpabuf emptyWpaBuffer;
 433
 434 static OM_uint32
 435 eapGssSmInitAuthenticate(OM_uint32 *minor,
 436                          gss_cred_id_t cred,
 437                          gss_ctx_id_t ctx,
 438                          gss_name_t target,
 439                          gss_OID mech,
 440                          OM_uint32 reqFlags,
 441                          OM_uint32 timeReq,
 442                          gss_channel_bindings_t chanBindings,
 443                          gss_buffer_t inputToken,
 444                          gss_buffer_t outputToken)
 445 {
 446     OM_uint32 major;
 447     OM_uint32 tmpMinor;
 448     int code;
 449     struct wpabuf *resp = NULL;
 450     int initialContextToken;
 451
 452     *minor = 0;
 453
 454     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 455                            inputToken->length == 0);
 456
 457     major = peerConfigInit(minor, cred, ctx);
 458     if (GSS_ERROR(major))
 459         goto cleanup;
 460
 461     if (ctx->initiatorCtx.eap == NULL) {
 462         struct eap_config eapConfig;
 463
 464         memset(&eapConfig, 0, sizeof(eapConfig));
 465
 466         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 467                                                  &gssEapPolicyCallbacks,
 468                                                  ctx,
 469                                                  &eapConfig);
 470         if (ctx->initiatorCtx.eap == NULL) {
 471             major = GSS_S_FAILURE;
 472             *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 473             goto cleanup;
 474         }
 475
 476         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 477     }
 478
 479     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 480
 481     wpabuf_set(&ctx->initiatorCtx.reqData,
 482                inputToken->value, inputToken->length);
 483
 484     major = GSS_S_CONTINUE_NEEDED;
 485
 486     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 487     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 488         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 489
 490         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 491     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 492         major = initReady(minor, ctx, reqFlags);
 493         if (GSS_ERROR(major))
 494             goto cleanup;
 495
 496         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 497         major = GSS_S_CONTINUE_NEEDED;
 498         ctx->state = GSSEAP_STATE_EXTENSIONS_REQ;
 499     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 500         major = GSS_S_DEFECTIVE_CREDENTIAL;
 501         *minor = GSSEAP_PEER_AUTH_FAILURE;
 502     } else if (code == 0 && initialContextToken) {
 503         resp = &emptyWpaBuffer;
 504         major = GSS_S_CONTINUE_NEEDED;
 505     } else {
 506         major = GSS_S_DEFECTIVE_TOKEN;
 507         *minor = GSSEAP_PEER_BAD_MESSAGE;
 508     }
 509
 510 cleanup:
 511     if (resp != NULL) {
 512         OM_uint32 tmpMajor;
 513         gss_buffer_desc respBuf;
 514
 515         assert(major == GSS_S_CONTINUE_NEEDED);
 516
 517         respBuf.length = wpabuf_len(resp);
 518         respBuf.value = (void *)wpabuf_head(resp);
 519
 520         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 521         if (GSS_ERROR(tmpMajor)) {
 522             major = tmpMajor;
 523             *minor = tmpMinor;
 524         }
 525     }
 526
 527     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 528     peerConfigFree(&tmpMinor, ctx);
 529
 530     return major;
 531 }
 532
 533 static OM_uint32
 534 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 535                           gss_cred_id_t cred,
 536                           gss_ctx_id_t ctx,
 537                           gss_name_t target,
 538                           gss_OID mech,
 539                           OM_uint32 reqFlags,
 540                           OM_uint32 timeReq,
 541                           gss_channel_bindings_t chanBindings,
 542                           gss_buffer_t inputToken,
 543                           gss_buffer_t outputToken)
 544 {
 545     OM_uint32 major;
 546
 547     major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
 548     if (GSS_ERROR(major))
 549         return major;
 550
 551     assert(outputToken->value != NULL);
 552
 553     ctx->state = GSSEAP_STATE_EXTENSIONS_RESP;
 554
 555     *minor = 0;
 556     return GSS_S_CONTINUE_NEEDED;
 557 }
 558
 559 static OM_uint32
 560 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 561                            gss_cred_id_t cred,
 562                            gss_ctx_id_t ctx,
 563                            gss_name_t target,
 564                            gss_OID mech,
 565                            OM_uint32 reqFlags,
 566                            OM_uint32 timeReq,
 567                            gss_channel_bindings_t chanBindings,
 568                            gss_buffer_t inputToken,
 569                            gss_buffer_t outputToken)
 570 {
 571     OM_uint32 major;
 572
 573     major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
 574     if (GSS_ERROR(major))
 575         return major;
 576
 577     ctx->state = GSSEAP_STATE_ESTABLISHED;
 578
 579     *minor = 0;
 580     return GSS_S_COMPLETE;
 581 }
 582
 583 static OM_uint32
 584 eapGssSmInitEstablished(OM_uint32 *minor,
 585                         gss_cred_id_t cred,
 586                         gss_ctx_id_t ctx,
 587                         gss_name_t target,
 588                         gss_OID mech,
 589                         OM_uint32 reqFlags,
 590                         OM_uint32 timeReq,
 591                         gss_channel_bindings_t chanBindings,
 592                         gss_buffer_t inputToken,
 593                         gss_buffer_t outputToken)
 594 {
 595     /* Called with already established context */
 596     *minor = GSSEAP_CONTEXT_ESTABLISHED;
 597     return GSS_S_BAD_STATUS;
 598 }
 599
 600 static OM_uint32
 601 eapGssSmInitError(OM_uint32 *minor,
 602                   gss_cred_id_t cred,
 603                   gss_ctx_id_t ctx,
 604                   gss_name_t target,
 605                   gss_OID mech,
 606                   OM_uint32 reqFlags,
 607                   OM_uint32 timeReq,
 608                   gss_channel_bindings_t chanBindings,
 609                   gss_buffer_t inputToken,
 610                   gss_buffer_t outputToken)
 611 {
 612     OM_uint32 major;
 613     unsigned char *p;
 614
 615     if (inputToken->length < 8) {
 616         *minor = GSSEAP_TOK_TRUNC;
 617         return GSS_S_DEFECTIVE_TOKEN;
 618     }
 619
 620     p = (unsigned char *)inputToken->value;
 621
 622     major = load_uint32_be(&p[0]);
 623     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 624
 625     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 626         major = GSS_S_FAILURE;
 627         *minor = GSSEAP_BAD_ERROR_TOKEN;
 628     }
 629
 630     return major;
 631 }
 632
 633 static struct gss_eap_initiator_sm {
 634     enum gss_eap_token_type inputTokenType;
 635     enum gss_eap_token_type outputTokenType;
 636     OM_uint32 (*processToken)(OM_uint32 *,
 637                               gss_cred_id_t,
 638                               gss_ctx_id_t,
 639                               gss_name_t,
 640                               gss_OID,
 641                               OM_uint32,
 642                               OM_uint32,
 643                               gss_channel_bindings_t,
 644                               gss_buffer_t,
 645                               gss_buffer_t);
 646 } eapGssInitiatorSm[] = {
 647     { TOK_TYPE_NONE,        TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 648     { TOK_TYPE_EAP_REQ,     TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 649     { TOK_TYPE_NONE,        TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 650     { TOK_TYPE_EXT_RESP,    TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 651     { TOK_TYPE_NONE,        TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 652     { TOK_TYPE_CONTEXT_ERR, TOK_TYPE_NONE,          eapGssSmInitError               },
 653 #ifdef GSSEAP_ENABLE_REAUTH
 654     { TOK_TYPE_GSS_REAUTH,  TOK_TYPE_GSS_REAUTH,    eapGssSmInitGssReauth           },
 655 #endif
 656 };
 657
 658 OM_uint32
 659 gss_init_sec_context(OM_uint32 *minor,
 660                      gss_cred_id_t cred,
 661                      gss_ctx_id_t *context_handle,
 662                      gss_name_t target_name,
 663                      gss_OID mech_type,
 664                      OM_uint32 req_flags,
 665                      OM_uint32 time_req,
 666                      gss_channel_bindings_t input_chan_bindings,
 667                      gss_buffer_t input_token,
 668                      gss_OID *actual_mech_type,
 669                      gss_buffer_t output_token,
 670                      OM_uint32 *ret_flags,
 671                      OM_uint32 *time_rec)
 672 {
 673     OM_uint32 major;
 674     OM_uint32 tmpMajor, tmpMinor;
 675     gss_ctx_id_t ctx = *context_handle;
 676     struct gss_eap_initiator_sm *sm = NULL;
 677     gss_buffer_desc innerInputToken;
 678     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 679     enum gss_eap_token_type tokType;
 680     int initialContextToken = 0;
 681
 682     *minor = 0;
 683
 684     output_token->length = 0;
 685     output_token->value = NULL;
 686
 687     if (ctx == GSS_C_NO_CONTEXT) {
 688         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 689             *minor = GSSEAP_WRONG_SIZE;
 690             return GSS_S_DEFECTIVE_TOKEN;
 691         }
 692
 693         major = gssEapAllocContext(minor, &ctx);
 694         if (GSS_ERROR(major))
 695             return major;
 696
 697         ctx->flags |= CTX_FLAG_INITIATOR;
 698
 699         initialContextToken = 1;
 700         *context_handle = ctx;
 701     }
 702
 703     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 704
 705     if (cred == GSS_C_NO_CREDENTIAL) {
 706         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 707             major = gssEapAcquireCred(minor,
 708                                       GSS_C_NO_NAME,
 709                                       GSS_C_NO_BUFFER,
 710                                       time_req,
 711                                       GSS_C_NO_OID_SET,
 712                                       GSS_C_INITIATE,
 713                                       &ctx->defaultCred,
 714                                       NULL,
 715                                       NULL);
 716             if (GSS_ERROR(major))
 717                 goto cleanup;
 718         }
 719
 720         cred = ctx->defaultCred;
 721     }
 722
 723     GSSEAP_MUTEX_LOCK(&cred->mutex);
 724
 725 #ifdef GSSEAP_ENABLE_REAUTH
 726     if (initialContextToken && gssEapCanReauthP(cred, target_name, time_req))
 727         ctx->state = GSSEAP_STATE_KRB_REAUTH;
 728 #endif
 729
 730     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 731         major = GSS_S_NO_CRED;
 732         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 733         goto cleanup;
 734     }
 735
 736     sm = &eapGssInitiatorSm[ctx->state];
 737
 738     if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 739         major = gssEapVerifyToken(minor, ctx, input_token,
 740                                   &tokType, &innerInputToken);
 741         if (GSS_ERROR(major))
 742             goto cleanup;
 743
 744         if (tokType == TOK_TYPE_CONTEXT_ERR) {
 745             ctx->state = GSSEAP_STATE_ERROR;
 746         } else if (tokType != sm->inputTokenType) {
 747             major = GSS_S_DEFECTIVE_TOKEN;
 748             *minor = GSSEAP_WRONG_TOK_ID;
 749             goto cleanup;
 750         }
 751     } else {
 752         innerInputToken.length = 0;
 753         innerInputToken.value = NULL;
 754     }
 755
 756     /*
 757      * Advance through state machine whilst empty tokens are emitted and
 758      * the status is not GSS_S_COMPLETE or an error status.
 759      */
 760     do {
 761         sm = &eapGssInitiatorSm[ctx->state];
 762
 763         major = (sm->processToken)(minor,
 764                                    cred,
 765                                    ctx,
 766                                    target_name,
 767                                    mech_type,
 768                                    req_flags,
 769                                    time_req,
 770                                    input_chan_bindings,
 771                                    &innerInputToken,
 772                                    &innerOutputToken);
 773         if (GSS_ERROR(major))
 774             goto cleanup;
 775     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 776
 777     if (actual_mech_type != NULL) {
 778         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 779             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 780     }
 781     if (innerOutputToken.value != NULL) {
 782         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 783                                    sm->outputTokenType, output_token);
 784         if (GSS_ERROR(tmpMajor)) {
 785             major = tmpMajor;
 786             *minor = tmpMinor;
 787             goto cleanup;
 788         }
 789     }
 790     if (ret_flags != NULL)
 791         *ret_flags = ctx->gssFlags;
 792     if (time_rec != NULL)
 793         gssEapContextTime(&tmpMinor, ctx, time_rec);
 794
 795     assert(ctx->state == GSSEAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 796
 797 cleanup:
 798     if (cred != GSS_C_NO_CREDENTIAL)
 799         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 800     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 801
 802     if (GSS_ERROR(major))
 803         gssEapReleaseContext(&tmpMinor, context_handle);
 804
 805     gss_release_buffer(&tmpMinor, &innerOutputToken);
 806
 807     return major;
 808 }
 809
 810 #ifdef GSSEAP_ENABLE_REAUTH
 811 static OM_uint32
 812 eapGssSmInitGssReauth(OM_uint32 *minor,
 813                       gss_cred_id_t cred,
 814                       gss_ctx_id_t ctx,
 815                       gss_name_t target,
 816                       gss_OID mech,
 817                       OM_uint32 reqFlags,
 818                       OM_uint32 timeReq,
 819                       gss_channel_bindings_t chanBindings,
 820                       gss_buffer_t inputToken,
 821                       gss_buffer_t outputToken)
 822 {
 823     OM_uint32 major, tmpMinor;
 824     gss_name_t mechTarget = GSS_C_NO_NAME;
 825     gss_OID actualMech = GSS_C_NO_OID;
 826     OM_uint32 gssFlags, timeRec;
 827
 828     assert(cred != GSS_C_NO_CREDENTIAL);
 829
 830     ctx->flags |= CTX_FLAG_KRB_REAUTH;
 831
 832     if (inputToken->length == 0) {
 833         major = initBegin(minor, cred, ctx, target, mech,
 834                           reqFlags, timeReq, chanBindings,
 835                           inputToken, outputToken);
 836         if (GSS_ERROR(major))
 837             goto cleanup;
 838     }
 839
 840     major = gssEapMechToGlueName(minor, target, &mechTarget);
 841     if (GSS_ERROR(major))
 842         goto cleanup;
 843
 844     major = gssInitSecContext(minor,
 845                               cred->krbCred,
 846                               &ctx->kerberosCtx,
 847                               mechTarget,
 848                               (gss_OID)gss_mech_krb5,
 849                               reqFlags, /* | GSS_C_DCE_STYLE, */
 850                               timeReq,
 851                               chanBindings,
 852                               inputToken,
 853                               &actualMech,
 854                               outputToken,
 855                               &gssFlags,
 856                               &timeRec);
 857     if (GSS_ERROR(major))
 858         goto cleanup;
 859
 860     ctx->gssFlags = gssFlags;
 861
 862     if (major == GSS_S_COMPLETE) {
 863         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 864         if (GSS_ERROR(major))
 865             goto cleanup;
 866         ctx->state = GSSEAP_STATE_ESTABLISHED;
 867     }
 868
 869 cleanup:
 870     gssReleaseName(&tmpMinor, &mechTarget);
 871
 872     return major;
 873 }
 874 #endif /* GSSEAP_ENABLE_REAUTH */