www.project-moonshot.org Git - mech_eap.orig/blob - 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     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 225     if (code != 0) {
 226         *minor = code;
 227         return GSS_S_FAILURE;
 228     }
 229
 230     eapPeerConfig->identity = (unsigned char *)identity;
 231     eapPeerConfig->identity_len = strlen(identity);
 232     eapPeerConfig->password = (unsigned char *)cred->password.value;
 233     eapPeerConfig->password_len = cred->password.length;
 234
 235     return GSS_S_COMPLETE;
 236 }
 237
 238 static OM_uint32
 239 peerConfigFree(OM_uint32 *minor,
 240                gss_ctx_id_t ctx)
 241 {
 242     krb5_context krbContext;
 243     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 244
 245     GSSEAP_KRB_INIT(&krbContext);
 246
 247     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 248
 249     return GSS_S_COMPLETE;
 250 }
 251
 252 /*
 253  * Mark an initiator context as ready for cryptographic operations
 254  */
 255 static OM_uint32
 256 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 257 {
 258     OM_uint32 major;
 259     const unsigned char *key;
 260     size_t keyLength;
 261
 262 #if 1
 263     /* XXX actually check for mutual auth */
 264     if (reqFlags & GSS_C_MUTUAL_FLAG)
 265         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 266 #endif
 267
 268     /* Cache encryption type derived from selected mechanism OID */
 269     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 270     if (GSS_ERROR(major))
 271         return major;
 272
 273     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 274         *minor = GSSEAP_KEY_UNAVAILABLE;
 275         return GSS_S_UNAVAILABLE;
 276     }
 277
 278     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 279
 280     if (keyLength < EAP_EMSK_LEN) {
 281         *minor = GSSEAP_KEY_TOO_SHORT;
 282         return GSS_S_UNAVAILABLE;
 283     }
 284
 285     major = gssEapDeriveRfc3961Key(minor,
 286                                    &key[EAP_EMSK_LEN / 2],
 287                                    EAP_EMSK_LEN / 2,
 288                                    ctx->encryptionType,
 289                                    &ctx->rfc3961Key);
 290        if (GSS_ERROR(major))
 291            return major;
 292
 293     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 294                                       &ctx->checksumType);
 295     if (GSS_ERROR(major))
 296         return major;
 297
 298     major = sequenceInit(minor,
 299                          &ctx->seqState,
 300                          ctx->recvSeq,
 301                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 302                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 303                          TRUE);
 304     if (GSS_ERROR(major))
 305         return major;
 306
 307     *minor = 0;
 308     return GSS_S_COMPLETE;
 309 }
 310
 311 static OM_uint32
 312 initBegin(OM_uint32 *minor,
 313           gss_cred_id_t cred,
 314           gss_ctx_id_t ctx,
 315           gss_name_t target,
 316           gss_OID mech,
 317           OM_uint32 reqFlags,
 318           OM_uint32 timeReq,
 319           gss_channel_bindings_t chanBindings,
 320           gss_buffer_t inputToken,
 321           gss_buffer_t outputToken)
 322 {
 323     OM_uint32 major;
 324
 325     assert(cred != GSS_C_NO_CREDENTIAL);
 326
 327     if (cred->expiryTime)
 328         ctx->expiryTime = cred->expiryTime;
 329     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 330         ctx->expiryTime = 0;
 331     else
 332         ctx->expiryTime = time(NULL) + timeReq;
 333
 334     /*
 335      * The credential mutex protects its name, however we need to
 336      * explicitly lock the acceptor name (unlikely as it may be
 337      * that it has attributes set on it).
 338      */
 339     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 340     if (GSS_ERROR(major))
 341         return major;
 342
 343     GSSEAP_MUTEX_LOCK(&target->mutex);
 344
 345     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 346     if (GSS_ERROR(major)) {
 347         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 348         return major;
 349     }
 350
 351     GSSEAP_MUTEX_UNLOCK(&target->mutex);
 352
 353     if (mech == GSS_C_NULL_OID) {
 354         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 355     } else if (gssEapIsConcreteMechanismOid(mech)) {
 356         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 357             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 358     } else {
 359         *minor = GSSEAP_WRONG_MECH;
 360         major = GSS_S_BAD_MECH;
 361     }
 362     if (GSS_ERROR(major))
 363         return major;
 364
 365     /* If credentials were provided, check they're usable with this mech */
 366     if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
 367         return GSS_S_BAD_MECH;
 368
 369     return GSS_S_COMPLETE;
 370 }
 371
 372 static OM_uint32
 373 eapGssSmInitIdentity(OM_uint32 *minor,
 374                      gss_cred_id_t cred,
 375                      gss_ctx_id_t ctx,
 376                      gss_name_t target,
 377                      gss_OID mech,
 378                      OM_uint32 reqFlags,
 379                      OM_uint32 timeReq,
 380                      gss_channel_bindings_t chanBindings,
 381                      gss_buffer_t inputToken,
 382                      gss_buffer_t outputToken)
 383 {
 384     OM_uint32 major;
 385     int initialContextToken;
 386
 387     initialContextToken = (inputToken->length == 0);
 388     if (!initialContextToken) {
 389         *minor = GSSEAP_WRONG_SIZE;
 390         return GSS_S_DEFECTIVE_TOKEN;
 391     }
 392
 393     major = initBegin(minor, cred, ctx, target, mech,
 394                       reqFlags, timeReq, chanBindings,
 395                       inputToken, outputToken);
 396     if (GSS_ERROR(major))
 397         return major;
 398
 399     ctx->state = EAP_STATE_AUTHENTICATE;
 400
 401     return GSS_S_CONTINUE_NEEDED;
 402 }
 403
 404 static struct wpabuf emptyWpaBuffer;
 405
 406 static OM_uint32
 407 eapGssSmInitAuthenticate(OM_uint32 *minor,
 408                          gss_cred_id_t cred,
 409                          gss_ctx_id_t ctx,
 410                          gss_name_t target,
 411                          gss_OID mech,
 412                          OM_uint32 reqFlags,
 413                          OM_uint32 timeReq,
 414                          gss_channel_bindings_t chanBindings,
 415                          gss_buffer_t inputToken,
 416                          gss_buffer_t outputToken)
 417 {
 418     OM_uint32 major;
 419     OM_uint32 tmpMinor;
 420     int code;
 421     struct wpabuf *resp = NULL;
 422     int initialContextToken;
 423
 424     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 425                            inputToken->length == 0);
 426
 427     major = peerConfigInit(minor, cred, ctx);
 428     if (GSS_ERROR(major))
 429         goto cleanup;
 430
 431     if (ctx->initiatorCtx.eap == NULL) {
 432         struct eap_config eapConfig;
 433
 434         memset(&eapConfig, 0, sizeof(eapConfig));
 435
 436         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 437                                                  &gssEapPolicyCallbacks,
 438                                                  ctx,
 439                                                  &eapConfig);
 440         if (ctx->initiatorCtx.eap == NULL) {
 441             *minor = GSSEAP_PEER_INIT_FAILURE;
 442             major = GSS_S_FAILURE;
 443             goto cleanup;
 444         }
 445
 446         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 447     }
 448
 449     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 450
 451     wpabuf_set(&ctx->initiatorCtx.reqData,
 452                inputToken->value, inputToken->length);
 453
 454     major = GSS_S_CONTINUE_NEEDED;
 455
 456     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 457     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 458         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 459
 460         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 461     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 462         major = initReady(minor, ctx, reqFlags);
 463         if (GSS_ERROR(major))
 464             goto cleanup;
 465
 466         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 467         major = GSS_S_CONTINUE_NEEDED;
 468         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 469     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 470         *minor = GSSEAP_PEER_AUTH_FAILURE;
 471         major = GSS_S_DEFECTIVE_CREDENTIAL;
 472     } else if (code == 0 && initialContextToken) {
 473         resp = &emptyWpaBuffer;
 474         major = GSS_S_CONTINUE_NEEDED;
 475     } else {
 476         *minor = GSSEAP_PEER_BAD_MESSAGE;
 477         major = GSS_S_DEFECTIVE_TOKEN;
 478     }
 479
 480 cleanup:
 481     if (resp != NULL) {
 482         OM_uint32 tmpMajor;
 483         gss_buffer_desc respBuf;
 484
 485         assert(major == GSS_S_CONTINUE_NEEDED);
 486
 487         respBuf.length = wpabuf_len(resp);
 488         respBuf.value = (void *)wpabuf_head(resp);
 489
 490         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 491         if (GSS_ERROR(tmpMajor)) {
 492             major = tmpMajor;
 493             *minor = tmpMinor;
 494         }
 495     }
 496
 497     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 498     peerConfigFree(&tmpMinor, ctx);
 499
 500     return major;
 501 }
 502
 503 static OM_uint32
 504 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 505                           gss_cred_id_t cred,
 506                           gss_ctx_id_t ctx,
 507                           gss_name_t target,
 508                           gss_OID mech,
 509                           OM_uint32 reqFlags,
 510                           OM_uint32 timeReq,
 511                           gss_channel_bindings_t chanBindings,
 512                           gss_buffer_t inputToken,
 513                           gss_buffer_t outputToken)
 514 {
 515     OM_uint32 major;
 516
 517     major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
 518     if (GSS_ERROR(major))
 519         return major;
 520
 521     assert(outputToken->value != NULL);
 522
 523     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 524
 525     return GSS_S_CONTINUE_NEEDED;
 526 }
 527
 528 static OM_uint32
 529 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 530                            gss_cred_id_t cred,
 531                            gss_ctx_id_t ctx,
 532                            gss_name_t target,
 533                            gss_OID mech,
 534                            OM_uint32 reqFlags,
 535                            OM_uint32 timeReq,
 536                            gss_channel_bindings_t chanBindings,
 537                            gss_buffer_t inputToken,
 538                            gss_buffer_t outputToken)
 539 {
 540     OM_uint32 major;
 541
 542     major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
 543     if (GSS_ERROR(major))
 544         return major;
 545
 546     ctx->state = EAP_STATE_ESTABLISHED;
 547
 548     return GSS_S_COMPLETE;
 549 }
 550
 551 static OM_uint32
 552 eapGssSmInitEstablished(OM_uint32 *minor,
 553                         gss_cred_id_t cred,
 554                         gss_ctx_id_t ctx,
 555                         gss_name_t target,
 556                         gss_OID mech,
 557                         OM_uint32 reqFlags,
 558                         OM_uint32 timeReq,
 559                         gss_channel_bindings_t chanBindings,
 560                         gss_buffer_t inputToken,
 561                         gss_buffer_t outputToken)
 562 {
 563     /* Called with already established context */
 564     *minor = GSSEAP_CONTEXT_ESTABLISHED;
 565     return GSS_S_BAD_STATUS;
 566 }
 567
 568 static OM_uint32
 569 eapGssSmInitError(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     OM_uint32 major;
 581     unsigned char *p;
 582
 583     if (inputToken->length < 8) {
 584         *minor = GSSEAP_WRONG_SIZE;
 585         return GSS_S_DEFECTIVE_TOKEN;
 586     }
 587
 588     p = (unsigned char *)inputToken->value;
 589
 590     major = load_uint32_be(&p[0]);
 591     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 592
 593     if (!GSS_ERROR(major)) {
 594         *minor = GSSEAP_BAD_ERROR_TOKEN;
 595         major = GSS_S_FAILURE;
 596     }
 597
 598     return major;
 599 }
 600
 601 static struct gss_eap_initiator_sm {
 602     enum gss_eap_token_type inputTokenType;
 603     enum gss_eap_token_type outputTokenType;
 604     OM_uint32 (*processToken)(OM_uint32 *,
 605                               gss_cred_id_t,
 606                               gss_ctx_id_t,
 607                               gss_name_t,
 608                               gss_OID,
 609                               OM_uint32,
 610                               OM_uint32,
 611                               gss_channel_bindings_t,
 612                               gss_buffer_t,
 613                               gss_buffer_t);
 614 } eapGssInitiatorSm[] = {
 615     { TOK_TYPE_NONE,        TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 616     { TOK_TYPE_EAP_REQ,     TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 617     { TOK_TYPE_NONE,        TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 618     { TOK_TYPE_EXT_RESP,    TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 619     { TOK_TYPE_NONE,        TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 620     { TOK_TYPE_CONTEXT_ERR, TOK_TYPE_NONE,          eapGssSmInitError               },
 621 #ifdef GSSEAP_ENABLE_REAUTH
 622     { TOK_TYPE_GSS_REAUTH,  TOK_TYPE_GSS_REAUTH,    eapGssSmInitGssReauth           },
 623 #endif
 624 };
 625
 626 OM_uint32
 627 gss_init_sec_context(OM_uint32 *minor,
 628                      gss_cred_id_t cred,
 629                      gss_ctx_id_t *context_handle,
 630                      gss_name_t target_name,
 631                      gss_OID mech_type,
 632                      OM_uint32 req_flags,
 633                      OM_uint32 time_req,
 634                      gss_channel_bindings_t input_chan_bindings,
 635                      gss_buffer_t input_token,
 636                      gss_OID *actual_mech_type,
 637                      gss_buffer_t output_token,
 638                      OM_uint32 *ret_flags,
 639                      OM_uint32 *time_rec)
 640 {
 641     OM_uint32 major;
 642     OM_uint32 tmpMajor, tmpMinor;
 643     gss_ctx_id_t ctx = *context_handle;
 644     struct gss_eap_initiator_sm *sm = NULL;
 645     gss_buffer_desc innerInputToken;
 646     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 647     enum gss_eap_token_type tokType;
 648     gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
 649     int initialContextToken = 0;
 650
 651     *minor = 0;
 652
 653     output_token->length = 0;
 654     output_token->value = NULL;
 655
 656     if (ctx == GSS_C_NO_CONTEXT) {
 657         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 658             *minor = GSSEAP_WRONG_SIZE;
 659             return GSS_S_DEFECTIVE_TOKEN;
 660         }
 661
 662         major = gssEapAllocContext(minor, &ctx);
 663         if (GSS_ERROR(major))
 664             return major;
 665
 666         ctx->flags |= CTX_FLAG_INITIATOR;
 667
 668         initialContextToken = 1;
 669         *context_handle = ctx;
 670     }
 671
 672     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 673
 674     if (cred == GSS_C_NO_CREDENTIAL) {
 675         if (ctx->initiatorCtx.defaultCred == GSS_C_NO_CREDENTIAL) {
 676             major = gssEapAcquireCred(minor,
 677                                       GSS_C_NO_NAME,
 678                                       GSS_C_NO_BUFFER,
 679                                       time_req,
 680                                       GSS_C_NO_OID_SET,
 681                                       GSS_C_INITIATE,
 682                                       &defaultCred,
 683                                       NULL,
 684                                       NULL);
 685             if (GSS_ERROR(major))
 686                 goto cleanup;
 687         }
 688
 689         cred = ctx->initiatorCtx.defaultCred;
 690     }
 691
 692     GSSEAP_MUTEX_LOCK(&cred->mutex);
 693
 694 #ifdef GSSEAP_ENABLE_REAUTH
 695     if (initialContextToken && gssEapCanReauthP(cred, target_name, time_req))
 696         ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 697 #endif
 698
 699     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 700         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 701         major = GSS_S_NO_CRED;
 702         goto cleanup;
 703     }
 704
 705     sm = &eapGssInitiatorSm[ctx->state];
 706
 707     if (input_token != GSS_C_NO_BUFFER) {
 708         major = gssEapVerifyToken(minor, ctx, input_token,
 709                                   &tokType, &innerInputToken);
 710         if (GSS_ERROR(major))
 711             goto cleanup;
 712
 713         if (tokType == TOK_TYPE_CONTEXT_ERR) {
 714             ctx->state = EAP_STATE_ERROR;
 715         } else if (tokType != sm->inputTokenType) {
 716             *minor = GSSEAP_WRONG_TOK_ID;
 717             major = GSS_S_DEFECTIVE_TOKEN;
 718             goto cleanup;
 719         }
 720     } else {
 721         innerInputToken.length = 0;
 722         innerInputToken.value = NULL;
 723     }
 724
 725     /*
 726      * Advance through state machine whilst empty tokens are emitted and
 727      * the status is not GSS_S_COMPLETE or an error status.
 728      */
 729     do {
 730         sm = &eapGssInitiatorSm[ctx->state];
 731
 732         major = (sm->processToken)(minor,
 733                                    cred,
 734                                    ctx,
 735                                    target_name,
 736                                    mech_type,
 737                                    req_flags,
 738                                    time_req,
 739                                    input_chan_bindings,
 740                                    &innerInputToken,
 741                                    &innerOutputToken);
 742         if (GSS_ERROR(major))
 743             goto cleanup;
 744     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 745
 746     if (actual_mech_type != NULL) {
 747         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 748             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 749     }
 750     if (innerOutputToken.value != NULL) {
 751         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 752                                    sm->outputTokenType, output_token);
 753         if (GSS_ERROR(tmpMajor)) {
 754             major = tmpMajor;
 755             *minor = tmpMinor;
 756             goto cleanup;
 757         }
 758     }
 759     if (ret_flags != NULL)
 760         *ret_flags = ctx->gssFlags;
 761     if (time_rec != NULL)
 762         gssEapContextTime(&tmpMinor, ctx, time_rec);
 763
 764     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 765
 766 cleanup:
 767     if (cred != GSS_C_NO_CREDENTIAL)
 768         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 769     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 770
 771     if (GSS_ERROR(major))
 772         gssEapReleaseContext(&tmpMinor, context_handle);
 773
 774     gss_release_buffer(&tmpMinor, &innerOutputToken);
 775
 776     return major;
 777 }
 778
 779 #ifdef GSSEAP_ENABLE_REAUTH
 780 static OM_uint32
 781 eapGssSmInitGssReauth(OM_uint32 *minor,
 782                       gss_cred_id_t cred,
 783                       gss_ctx_id_t ctx,
 784                       gss_name_t target,
 785                       gss_OID mech,
 786                       OM_uint32 reqFlags,
 787                       OM_uint32 timeReq,
 788                       gss_channel_bindings_t chanBindings,
 789                       gss_buffer_t inputToken,
 790                       gss_buffer_t outputToken)
 791 {
 792     OM_uint32 major, tmpMinor;
 793     gss_name_t mechTarget = GSS_C_NO_NAME;
 794     gss_OID actualMech = GSS_C_NO_OID;
 795     OM_uint32 gssFlags, timeRec;
 796
 797     assert(cred != GSS_C_NO_CREDENTIAL);
 798
 799     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 800
 801     if (inputToken->length == 0) {
 802         major = initBegin(minor, cred, ctx, target, mech,
 803                           reqFlags, timeReq, chanBindings,
 804                           inputToken, outputToken);
 805         if (GSS_ERROR(major))
 806             goto cleanup;
 807     }
 808
 809     major = gssEapMechToGlueName(minor, target, &mechTarget);
 810     if (GSS_ERROR(major))
 811         goto cleanup;
 812
 813     major = gssInitSecContext(minor,
 814                               cred->krbCred,
 815                               &ctx->kerberosCtx,
 816                               mechTarget,
 817                               (gss_OID)gss_mech_krb5,
 818                               reqFlags, /* | GSS_C_DCE_STYLE, */
 819                               timeReq,
 820                               chanBindings,
 821                               inputToken,
 822                               &actualMech,
 823                               outputToken,
 824                               &gssFlags,
 825                               &timeRec);
 826     if (GSS_ERROR(major))
 827         goto cleanup;
 828
 829     ctx->gssFlags = gssFlags;
 830
 831     if (major == GSS_S_COMPLETE) {
 832         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 833         if (GSS_ERROR(major))
 834             goto cleanup;
 835         ctx->state = EAP_STATE_ESTABLISHED;
 836     }
 837
 838 cleanup:
 839     gssReleaseName(&tmpMinor, &mechTarget);
 840
 841     return major;
 842 }
 843 #endif /* GSSEAP_ENABLE_REAUTH */