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 int
  37 canReauthP(gss_cred_id_t cred);
  38
  39 static OM_uint32
  40 eapGssSmInitGssReauth(OM_uint32 *minor,
  41                       gss_cred_id_t cred,
  42                       gss_ctx_id_t ctx,
  43                       gss_name_t target,
  44                       gss_OID mech,
  45                       OM_uint32 reqFlags,
  46                       OM_uint32 timeReq,
  47                       gss_channel_bindings_t chanBindings,
  48                       gss_buffer_t inputToken,
  49                       gss_buffer_t outputToken);
  50 #endif
  51
  52 static OM_uint32
  53 policyVariableToFlag(enum eapol_bool_var variable)
  54 {
  55     OM_uint32 flag = 0;
  56
  57     switch (variable) {
  58     case EAPOL_eapSuccess:
  59         flag = CTX_FLAG_EAP_SUCCESS;
  60         break;
  61     case EAPOL_eapRestart:
  62         flag = CTX_FLAG_EAP_RESTART;
  63         break;
  64     case EAPOL_eapFail:
  65         flag = CTX_FLAG_EAP_FAIL;
  66         break;
  67     case EAPOL_eapResp:
  68         flag = CTX_FLAG_EAP_RESP;
  69         break;
  70     case EAPOL_eapNoResp:
  71         flag = CTX_FLAG_EAP_NO_RESP;
  72         break;
  73     case EAPOL_eapReq:
  74         flag = CTX_FLAG_EAP_REQ;
  75         break;
  76     case EAPOL_portEnabled:
  77         flag = CTX_FLAG_EAP_PORT_ENABLED;
  78         break;
  79     case EAPOL_altAccept:
  80         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  81         break;
  82     case EAPOL_altReject:
  83         flag = CTX_FLAG_EAP_ALT_REJECT;
  84         break;
  85     }
  86
  87     return flag;
  88 }
  89
  90 static struct eap_peer_config *
  91 peerGetConfig(void *ctx)
  92 {
  93     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  94
  95     return &gssCtx->initiatorCtx.eapPeerConfig;
  96 }
  97
  98 static Boolean
  99 peerGetBool(void *data, enum eapol_bool_var variable)
 100 {
 101     gss_ctx_id_t ctx = data;
 102     OM_uint32 flag;
 103
 104     if (ctx == GSS_C_NO_CONTEXT)
 105         return FALSE;
 106
 107     flag = policyVariableToFlag(variable);
 108
 109     return ((ctx->flags & flag) != 0);
 110 }
 111
 112 static void
 113 peerSetBool(void *data, enum eapol_bool_var variable,
 114             Boolean value)
 115 {
 116     gss_ctx_id_t ctx = data;
 117     OM_uint32 flag;
 118
 119     if (ctx == GSS_C_NO_CONTEXT)
 120         return;
 121
 122     flag = policyVariableToFlag(variable);
 123
 124     if (value)
 125         ctx->flags |= flag;
 126     else
 127         ctx->flags &= ~(flag);
 128 }
 129
 130 static unsigned int
 131 peerGetInt(void *data, enum eapol_int_var variable)
 132 {
 133     gss_ctx_id_t ctx = data;
 134
 135     if (ctx == GSS_C_NO_CONTEXT)
 136         return FALSE;
 137
 138     assert(CTX_IS_INITIATOR(ctx));
 139
 140     switch (variable) {
 141     case EAPOL_idleWhile:
 142         return ctx->initiatorCtx.idleWhile;
 143         break;
 144     }
 145
 146     return 0;
 147 }
 148
 149 static void
 150 peerSetInt(void *data, enum eapol_int_var variable,
 151            unsigned int value)
 152 {
 153     gss_ctx_id_t ctx = data;
 154
 155     if (ctx == GSS_C_NO_CONTEXT)
 156         return;
 157
 158     assert(CTX_IS_INITIATOR(ctx));
 159
 160     switch (variable) {
 161     case EAPOL_idleWhile:
 162         ctx->initiatorCtx.idleWhile = value;
 163         break;
 164     }
 165 }
 166
 167 static struct wpabuf *
 168 peerGetEapReqData(void *ctx)
 169 {
 170     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 171
 172     return &gssCtx->initiatorCtx.reqData;
 173 }
 174
 175 static void
 176 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 177 {
 178 }
 179
 180 static const struct wpa_config_blob *
 181 peerGetConfigBlob(void *ctx, const char *name)
 182 {
 183     return NULL;
 184 }
 185
 186 static void
 187 peerNotifyPending(void *ctx)
 188 {
 189 }
 190
 191 static struct eapol_callbacks gssEapPolicyCallbacks = {
 192     peerGetConfig,
 193     peerGetBool,
 194     peerSetBool,
 195     peerGetInt,
 196     peerSetInt,
 197     peerGetEapReqData,
 198     peerSetConfigBlob,
 199     peerGetConfigBlob,
 200     peerNotifyPending,
 201 };
 202
 203 extern int wpa_debug_level;
 204
 205 static OM_uint32
 206 peerConfigInit(OM_uint32 *minor,
 207                gss_cred_id_t cred,
 208                gss_ctx_id_t ctx)
 209 {
 210     krb5_context krbContext;
 211     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 212     krb5_error_code code;
 213     char *identity;
 214
 215     GSSEAP_KRB_INIT(&krbContext);
 216
 217     eapPeerConfig->fragment_size = 1024;
 218     wpa_debug_level = 0;
 219
 220     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 221     if (code != 0) {
 222         *minor = code;
 223         return GSS_S_FAILURE;
 224     }
 225
 226     eapPeerConfig->identity = (unsigned char *)identity;
 227     eapPeerConfig->identity_len = strlen(identity);
 228     eapPeerConfig->password = (unsigned char *)cred->password.value;
 229     eapPeerConfig->password_len = cred->password.length;
 230
 231     return GSS_S_COMPLETE;
 232 }
 233
 234 static OM_uint32
 235 peerConfigFree(OM_uint32 *minor,
 236                gss_ctx_id_t ctx)
 237 {
 238     krb5_context krbContext;
 239     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 240
 241     GSSEAP_KRB_INIT(&krbContext);
 242
 243     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 244
 245     return GSS_S_COMPLETE;
 246 }
 247
 248 static OM_uint32
 249 initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
 250 {
 251     OM_uint32 major;
 252     const unsigned char *key;
 253     size_t keyLength;
 254     krb5_enctype encryptionType;
 255     int gotKey = 0;
 256
 257     /* Cache encryption type derived from selected mechanism OID */
 258     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &encryptionType);
 259     if (GSS_ERROR(major))
 260         return major;
 261
 262     if (encryptionType != ENCTYPE_NULL &&
 263         eap_key_available(ctx->initiatorCtx.eap)) {
 264         key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 265
 266         if (keyLength >= EAP_EMSK_LEN) {
 267             major = gssEapDeriveRfc3961Key(minor,
 268                                            &key[EAP_EMSK_LEN / 2],
 269                                            EAP_EMSK_LEN / 2,
 270                                            encryptionType,
 271                                            &ctx->rfc3961Key);
 272                if (GSS_ERROR(major))
 273                    return major;
 274
 275             major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 276                                               &ctx->checksumType);
 277             if (GSS_ERROR(major))
 278                 return major;
 279             gotKey++;
 280         }
 281     }
 282
 283     if (gotKey) {
 284         ctx->encryptionType = encryptionType;
 285     } else {
 286         /*
 287          * draft-howlett-eap-gss says that integrity/confidentialty should
 288          * always be advertised as available, but if we have no keying
 289          * material it seems confusing to the caller to advertise this.
 290          */
 291         ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
 292     }
 293
 294     major = sequenceInit(minor,
 295                          &ctx->seqState,
 296                          ctx->recvSeq,
 297                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 298                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 299                          TRUE);
 300     if (GSS_ERROR(major))
 301         return major;
 302
 303     return GSS_S_COMPLETE;
 304 }
 305
 306 static OM_uint32
 307 initBegin(OM_uint32 *minor,
 308           gss_cred_id_t cred,
 309           gss_ctx_id_t ctx,
 310           gss_name_t target,
 311           gss_OID mech,
 312           OM_uint32 reqFlags,
 313           OM_uint32 timeReq,
 314           gss_channel_bindings_t chanBindings,
 315           gss_buffer_t inputToken,
 316           gss_buffer_t outputToken)
 317 {
 318     OM_uint32 major;
 319
 320     if (cred != GSS_C_NO_CREDENTIAL && cred->expiryTime)
 321         ctx->expiryTime = cred->expiryTime;
 322     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 323         ctx->expiryTime = 0;
 324     else
 325         ctx->expiryTime = time(NULL) + timeReq;
 326
 327     if (cred != GSS_C_NO_CREDENTIAL) {
 328         major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 329         if (GSS_ERROR(major))
 330             return major;
 331     }
 332
 333     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 334     if (GSS_ERROR(major))
 335         return major;
 336
 337     if (mech == GSS_C_NULL_OID || oidEqual(mech, GSS_EAP_MECHANISM)) {
 338         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 339     } else if (gssEapIsConcreteMechanismOid(mech)) {
 340         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 341             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 342     } else {
 343         major = GSS_S_BAD_MECH;
 344     }
 345     if (GSS_ERROR(major))
 346         return major;
 347
 348     /* If credentials were provided, check they're usable with this mech */
 349     if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
 350         return GSS_S_BAD_MECH;
 351
 352     return GSS_S_COMPLETE;
 353 }
 354
 355 static OM_uint32
 356 eapGssSmInitIdentity(OM_uint32 *minor,
 357                      gss_cred_id_t cred,
 358                      gss_ctx_id_t ctx,
 359                      gss_name_t target,
 360                      gss_OID mech,
 361                      OM_uint32 reqFlags,
 362                      OM_uint32 timeReq,
 363                      gss_channel_bindings_t chanBindings,
 364                      gss_buffer_t inputToken,
 365                      gss_buffer_t outputToken)
 366 {
 367     OM_uint32 major;
 368     int initialContextToken;
 369
 370     initialContextToken = (inputToken->length == 0);
 371     if (!initialContextToken)
 372         return GSS_S_DEFECTIVE_TOKEN;
 373
 374     major = initBegin(minor, cred, ctx, target, mech,
 375                       reqFlags, timeReq, chanBindings,
 376                       inputToken, outputToken);
 377     if (GSS_ERROR(major))
 378         return major;
 379
 380     ctx->state = EAP_STATE_AUTHENTICATE;
 381
 382     return GSS_S_CONTINUE_NEEDED;
 383 }
 384
 385 static struct wpabuf emptyWpaBuffer;
 386
 387 static OM_uint32
 388 eapGssSmInitAuthenticate(OM_uint32 *minor,
 389                          gss_cred_id_t cred,
 390                          gss_ctx_id_t ctx,
 391                          gss_name_t target,
 392                          gss_OID mech,
 393                          OM_uint32 reqFlags,
 394                          OM_uint32 timeReq,
 395                          gss_channel_bindings_t chanBindings,
 396                          gss_buffer_t inputToken,
 397                          gss_buffer_t outputToken)
 398 {
 399     OM_uint32 major;
 400     OM_uint32 tmpMinor;
 401     int code;
 402     struct wpabuf *resp = NULL;
 403     int initialContextToken;
 404
 405     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 406                            inputToken->length == 0);
 407
 408     major = peerConfigInit(minor, cred, ctx);
 409     if (GSS_ERROR(major))
 410         goto cleanup;
 411
 412     if (ctx->initiatorCtx.eap == NULL) {
 413         struct eap_config eapConfig;
 414
 415         memset(&eapConfig, 0, sizeof(eapConfig));
 416
 417         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 418                                                  &gssEapPolicyCallbacks,
 419                                                  ctx,
 420                                                  &eapConfig);
 421         if (ctx->initiatorCtx.eap == NULL) {
 422             major = GSS_S_FAILURE;
 423             goto cleanup;
 424         }
 425
 426         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 427     }
 428
 429     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 430
 431     wpabuf_set(&ctx->initiatorCtx.reqData,
 432                inputToken->value, inputToken->length);
 433
 434     major = GSS_S_CONTINUE_NEEDED;
 435
 436     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 437     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 438         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 439
 440         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 441     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 442         major = initReady(minor, ctx);
 443         if (GSS_ERROR(major))
 444             goto cleanup;
 445
 446         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 447         major = GSS_S_CONTINUE_NEEDED;
 448         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 449     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 450         major = GSS_S_DEFECTIVE_CREDENTIAL;
 451     } else if (code == 0 && initialContextToken) {
 452         resp = &emptyWpaBuffer;
 453         major = GSS_S_CONTINUE_NEEDED;
 454     } else {
 455         major = GSS_S_DEFECTIVE_TOKEN;
 456     }
 457
 458 cleanup:
 459     if (resp != NULL) {
 460         OM_uint32 tmpMajor;
 461         gss_buffer_desc respBuf;
 462
 463         assert(major == GSS_S_CONTINUE_NEEDED);
 464
 465         respBuf.length = wpabuf_len(resp);
 466         respBuf.value = (void *)wpabuf_head(resp);
 467
 468         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 469         if (GSS_ERROR(tmpMajor)) {
 470             major = tmpMajor;
 471             *minor = tmpMinor;
 472         }
 473     }
 474
 475     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 476     peerConfigFree(&tmpMinor, ctx);
 477
 478     return major;
 479 }
 480
 481 static OM_uint32
 482 initGssChannelBindings(OM_uint32 *minor,
 483                        gss_ctx_id_t ctx,
 484                        gss_channel_bindings_t chanBindings,
 485                        gss_buffer_t outputToken)
 486 {
 487     OM_uint32 major;
 488     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 489
 490
 491     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 492         buffer = chanBindings->application_data;
 493
 494     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 495                        &buffer, NULL, outputToken);
 496     if (GSS_ERROR(major))
 497         return major;
 498
 499     return GSS_S_CONTINUE_NEEDED;
 500 }
 501
 502 static OM_uint32
 503 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 504                           gss_cred_id_t cred,
 505                           gss_ctx_id_t ctx,
 506                           gss_name_t target,
 507                           gss_OID mech,
 508                           OM_uint32 reqFlags,
 509                           OM_uint32 timeReq,
 510                           gss_channel_bindings_t chanBindings,
 511                           gss_buffer_t inputToken,
 512                           gss_buffer_t outputToken)
 513 {
 514     OM_uint32 major, tmpMinor;
 515     gss_buffer_desc cbToken = GSS_C_EMPTY_BUFFER;
 516
 517     major = initGssChannelBindings(minor, ctx, chanBindings, &cbToken);
 518     if (GSS_ERROR(major))
 519         return major;
 520
 521     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 522
 523     major = duplicateBuffer(minor, &cbToken, outputToken);
 524     if (GSS_ERROR(major)) {
 525         gss_release_buffer(&tmpMinor, &cbToken);
 526         return major;
 527     }
 528
 529     gss_release_buffer(&tmpMinor, &cbToken);
 530
 531     return GSS_S_CONTINUE_NEEDED;
 532 }
 533
 534 static OM_uint32
 535 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 536                            gss_cred_id_t cred,
 537                            gss_ctx_id_t ctx,
 538                            gss_name_t target,
 539                            gss_OID mech,
 540                            OM_uint32 reqFlags,
 541                            OM_uint32 timeReq,
 542                            gss_channel_bindings_t chanBindings,
 543                            gss_buffer_t inputToken,
 544                            gss_buffer_t outputToken)
 545 {
 546 #ifdef GSSEAP_ENABLE_REAUTH
 547     OM_uint32 major;
 548
 549     major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 550     if (GSS_ERROR(major))
 551         return major;
 552 #endif
 553
 554     ctx->state = EAP_STATE_ESTABLISHED;
 555
 556     return GSS_S_COMPLETE;
 557 }
 558
 559 static OM_uint32
 560 eapGssSmInitEstablished(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     /* Called with already established context */
 572     *minor = EINVAL;
 573     return GSS_S_BAD_STATUS;
 574 }
 575
 576 static struct gss_eap_initiator_sm {
 577     enum gss_eap_token_type inputTokenType;
 578     enum gss_eap_token_type outputTokenType;
 579     OM_uint32 (*processToken)(OM_uint32 *,
 580                               gss_cred_id_t,
 581                               gss_ctx_id_t,
 582                               gss_name_t,
 583                               gss_OID,
 584                               OM_uint32,
 585                               OM_uint32,
 586                               gss_channel_bindings_t,
 587                               gss_buffer_t,
 588                               gss_buffer_t);
 589 } eapGssInitiatorSm[] = {
 590     { TOK_TYPE_NONE,    TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 591     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 592     { TOK_TYPE_NONE,    TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 593     { TOK_TYPE_EXT_RESP,TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 594     { TOK_TYPE_NONE,    TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 595 #ifdef GSSEAP_ENABLE_REAUTH
 596     { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth           },
 597 #endif
 598 };
 599
 600 OM_uint32
 601 gss_init_sec_context(OM_uint32 *minor,
 602                      gss_cred_id_t cred,
 603                      gss_ctx_id_t *context_handle,
 604                      gss_name_t target_name,
 605                      gss_OID mech_type,
 606                      OM_uint32 req_flags,
 607                      OM_uint32 time_req,
 608                      gss_channel_bindings_t input_chan_bindings,
 609                      gss_buffer_t input_token,
 610                      gss_OID *actual_mech_type,
 611                      gss_buffer_t output_token,
 612                      OM_uint32 *ret_flags,
 613                      OM_uint32 *time_rec)
 614 {
 615     OM_uint32 major;
 616     OM_uint32 tmpMajor, tmpMinor;
 617     gss_ctx_id_t ctx = *context_handle;
 618     struct gss_eap_initiator_sm *sm = NULL;
 619     gss_buffer_desc innerInputToken;
 620     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 621     enum gss_eap_token_type tokType;
 622
 623     *minor = 0;
 624
 625     output_token->length = 0;
 626     output_token->value = NULL;
 627
 628     if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_INITIATE)) {
 629         return GSS_S_NO_CRED;
 630     }
 631
 632     if (ctx == GSS_C_NO_CONTEXT) {
 633         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 634             return GSS_S_DEFECTIVE_TOKEN;
 635         }
 636
 637         major = gssEapAllocContext(minor, &ctx);
 638         if (GSS_ERROR(major))
 639             return major;
 640
 641         ctx->flags |= CTX_FLAG_INITIATOR;
 642
 643 #ifdef GSSEAP_ENABLE_REAUTH
 644         if (canReauthP(cred))
 645             ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 646 #endif
 647
 648         *context_handle = ctx;
 649     }
 650
 651     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 652
 653     sm = &eapGssInitiatorSm[ctx->state];
 654
 655     if (input_token != GSS_C_NO_BUFFER) {
 656         major = gssEapVerifyToken(minor, ctx, input_token,
 657                                   &tokType, &innerInputToken);
 658         if (GSS_ERROR(major))
 659             goto cleanup;
 660
 661         if (tokType != sm->inputTokenType) {
 662             major = GSS_S_DEFECTIVE_TOKEN;
 663             goto cleanup;
 664         }
 665     } else {
 666         innerInputToken.length = 0;
 667         innerInputToken.value = NULL;
 668     }
 669
 670     /*
 671      * Advance through state machine whilst empty tokens are emitted and
 672      * the status is not GSS_S_COMPLETE or an error status.
 673      */
 674     do {
 675         sm = &eapGssInitiatorSm[ctx->state];
 676
 677         major = (sm->processToken)(minor,
 678                                    cred,
 679                                    ctx,
 680                                    target_name,
 681                                    mech_type,
 682                                    req_flags,
 683                                    time_req,
 684                                    input_chan_bindings,
 685                                    &innerInputToken,
 686                                    &innerOutputToken);
 687         if (GSS_ERROR(major))
 688             goto cleanup;
 689     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 690
 691     if (actual_mech_type != NULL) {
 692         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 693             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 694     }
 695     if (innerOutputToken.value != NULL) {
 696         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 697                                    sm->outputTokenType, output_token);
 698         if (GSS_ERROR(tmpMajor)) {
 699             major = tmpMajor;
 700             *minor = tmpMinor;
 701             goto cleanup;
 702         }
 703     }
 704     if (ret_flags != NULL)
 705         *ret_flags = ctx->gssFlags;
 706     if (time_rec != NULL)
 707         gssEapContextTime(&tmpMinor, ctx, time_rec);
 708
 709     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 710
 711 cleanup:
 712     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 713
 714     if (GSS_ERROR(major))
 715         gssEapReleaseContext(&tmpMinor, context_handle);
 716
 717     gss_release_buffer(&tmpMinor, &innerOutputToken);
 718
 719     return major;
 720 }
 721
 722 #ifdef GSSEAP_ENABLE_REAUTH
 723 static int
 724 canReauthP(gss_cred_id_t cred)
 725 {
 726     return (cred != GSS_C_NO_CREDENTIAL &&
 727             cred->krbCred != GSS_C_NO_CREDENTIAL &&
 728             cred->expiryTime > time(NULL));
 729 }
 730
 731 static OM_uint32
 732 eapGssSmInitGssReauth(OM_uint32 *minor,
 733                       gss_cred_id_t cred,
 734                       gss_ctx_id_t ctx,
 735                       gss_name_t target,
 736                       gss_OID mech,
 737                       OM_uint32 reqFlags,
 738                       OM_uint32 timeReq,
 739                       gss_channel_bindings_t chanBindings,
 740                       gss_buffer_t inputToken,
 741                       gss_buffer_t outputToken)
 742 {
 743     OM_uint32 major, tmpMinor;
 744     gss_name_t mechTarget = GSS_C_NO_NAME;
 745     gss_OID actualMech = GSS_C_NO_OID;
 746     OM_uint32 gssFlags, timeRec;
 747
 748     assert(cred != GSS_C_NO_CREDENTIAL);
 749
 750     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 751
 752     if (inputToken->length == 0) {
 753         major = initBegin(minor, cred, ctx, target, mech,
 754                           reqFlags, timeReq, chanBindings,
 755                           inputToken, outputToken);
 756         if (GSS_ERROR(major))
 757             goto cleanup;
 758     }
 759
 760     major = gssEapMechToGlueName(minor, target, &mechTarget);
 761     if (GSS_ERROR(major))
 762         goto cleanup;
 763
 764     major = gssInitSecContext(minor,
 765                               cred->krbCred,
 766                               &ctx->kerberosCtx,
 767                               mechTarget,
 768                               (gss_OID)gss_mech_krb5,
 769                               reqFlags, /* | GSS_C_DCE_STYLE, */
 770                               timeReq,
 771                               chanBindings,
 772                               inputToken,
 773                               &actualMech,
 774                               outputToken,
 775                               &gssFlags,
 776                               &timeRec);
 777     if (GSS_ERROR(major))
 778         goto cleanup;
 779
 780     ctx->gssFlags = gssFlags;
 781
 782     if (major == GSS_S_COMPLETE) {
 783         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 784         if (GSS_ERROR(major))
 785             goto cleanup;
 786         ctx->state = EAP_STATE_ESTABLISHED;
 787     }
 788
 789 cleanup:
 790     gssReleaseName(&tmpMinor, &mechTarget);
 791
 792     return major;
 793 }
 794 #endif /* GSSEAP_ENABLE_REAUTH */
 795
 796