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 static OM_uint32
 253 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 254 {
 255     OM_uint32 major;
 256     const unsigned char *key;
 257     size_t keyLength;
 258
 259 #if 1
 260     /* XXX actually check for mutual auth */
 261     if (reqFlags & GSS_C_MUTUAL_FLAG)
 262         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 263 #endif
 264
 265     /* Cache encryption type derived from selected mechanism OID */
 266     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 267     if (GSS_ERROR(major))
 268         return major;
 269
 270     if (!eap_key_available(ctx->initiatorCtx.eap))
 271         return GSS_S_UNAVAILABLE;
 272
 273     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 274
 275     if (keyLength < EAP_EMSK_LEN)
 276         return GSS_S_UNAVAILABLE;
 277
 278     major = gssEapDeriveRfc3961Key(minor,
 279                                    &key[EAP_EMSK_LEN / 2],
 280                                    EAP_EMSK_LEN / 2,
 281                                    ctx->encryptionType,
 282                                    &ctx->rfc3961Key);
 283        if (GSS_ERROR(major))
 284            return major;
 285
 286     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 287                                       &ctx->checksumType);
 288     if (GSS_ERROR(major))
 289         return major;
 290
 291     major = sequenceInit(minor,
 292                          &ctx->seqState,
 293                          ctx->recvSeq,
 294                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 295                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 296                          TRUE);
 297     if (GSS_ERROR(major))
 298         return major;
 299
 300     return GSS_S_COMPLETE;
 301 }
 302
 303 static OM_uint32
 304 initBegin(OM_uint32 *minor,
 305           gss_cred_id_t cred,
 306           gss_ctx_id_t ctx,
 307           gss_name_t target,
 308           gss_OID mech,
 309           OM_uint32 reqFlags,
 310           OM_uint32 timeReq,
 311           gss_channel_bindings_t chanBindings,
 312           gss_buffer_t inputToken,
 313           gss_buffer_t outputToken)
 314 {
 315     OM_uint32 major;
 316
 317     assert(cred != GSS_C_NO_CREDENTIAL);
 318
 319     if (cred->expiryTime)
 320         ctx->expiryTime = cred->expiryTime;
 321     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 322         ctx->expiryTime = 0;
 323     else
 324         ctx->expiryTime = time(NULL) + timeReq;
 325
 326     /*
 327      * The credential mutex protects its name, however we need to
 328      * explicitly lock the acceptor name (unlikely as it may be
 329      * that it has attributes set on it).
 330      */
 331     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 332     if (GSS_ERROR(major))
 333         return major;
 334
 335     GSSEAP_MUTEX_LOCK(&target->mutex);
 336
 337     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 338     if (GSS_ERROR(major)) {
 339         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 340         return major;
 341     }
 342
 343     GSSEAP_MUTEX_UNLOCK(&target->mutex);
 344
 345     if (mech == GSS_C_NULL_OID) {
 346         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 347     } else if (gssEapIsConcreteMechanismOid(mech)) {
 348         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 349             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 350     } else {
 351         major = GSS_S_BAD_MECH;
 352     }
 353     if (GSS_ERROR(major))
 354         return major;
 355
 356     /* If credentials were provided, check they're usable with this mech */
 357     if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
 358         return GSS_S_BAD_MECH;
 359
 360     return GSS_S_COMPLETE;
 361 }
 362
 363 static OM_uint32
 364 eapGssSmInitIdentity(OM_uint32 *minor,
 365                      gss_cred_id_t cred,
 366                      gss_ctx_id_t ctx,
 367                      gss_name_t target,
 368                      gss_OID mech,
 369                      OM_uint32 reqFlags,
 370                      OM_uint32 timeReq,
 371                      gss_channel_bindings_t chanBindings,
 372                      gss_buffer_t inputToken,
 373                      gss_buffer_t outputToken)
 374 {
 375     OM_uint32 major;
 376     int initialContextToken;
 377
 378     initialContextToken = (inputToken->length == 0);
 379     if (!initialContextToken)
 380         return GSS_S_DEFECTIVE_TOKEN;
 381
 382     major = initBegin(minor, cred, ctx, target, mech,
 383                       reqFlags, timeReq, chanBindings,
 384                       inputToken, outputToken);
 385     if (GSS_ERROR(major))
 386         return major;
 387
 388     ctx->state = EAP_STATE_AUTHENTICATE;
 389
 390     return GSS_S_CONTINUE_NEEDED;
 391 }
 392
 393 static struct wpabuf emptyWpaBuffer;
 394
 395 static OM_uint32
 396 eapGssSmInitAuthenticate(OM_uint32 *minor,
 397                          gss_cred_id_t cred,
 398                          gss_ctx_id_t ctx,
 399                          gss_name_t target,
 400                          gss_OID mech,
 401                          OM_uint32 reqFlags,
 402                          OM_uint32 timeReq,
 403                          gss_channel_bindings_t chanBindings,
 404                          gss_buffer_t inputToken,
 405                          gss_buffer_t outputToken)
 406 {
 407     OM_uint32 major;
 408     OM_uint32 tmpMinor;
 409     int code;
 410     struct wpabuf *resp = NULL;
 411     int initialContextToken;
 412
 413     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 414                            inputToken->length == 0);
 415
 416     major = peerConfigInit(minor, cred, ctx);
 417     if (GSS_ERROR(major))
 418         goto cleanup;
 419
 420     if (ctx->initiatorCtx.eap == NULL) {
 421         struct eap_config eapConfig;
 422
 423         memset(&eapConfig, 0, sizeof(eapConfig));
 424
 425         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 426                                                  &gssEapPolicyCallbacks,
 427                                                  ctx,
 428                                                  &eapConfig);
 429         if (ctx->initiatorCtx.eap == NULL) {
 430             major = GSS_S_FAILURE;
 431             goto cleanup;
 432         }
 433
 434         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 435     }
 436
 437     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 438
 439     wpabuf_set(&ctx->initiatorCtx.reqData,
 440                inputToken->value, inputToken->length);
 441
 442     major = GSS_S_CONTINUE_NEEDED;
 443
 444     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 445     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 446         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 447
 448         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 449     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 450         major = initReady(minor, ctx, reqFlags);
 451         if (GSS_ERROR(major))
 452             goto cleanup;
 453
 454         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 455         major = GSS_S_CONTINUE_NEEDED;
 456         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 457     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 458         major = GSS_S_DEFECTIVE_CREDENTIAL;
 459     } else if (code == 0 && initialContextToken) {
 460         resp = &emptyWpaBuffer;
 461         major = GSS_S_CONTINUE_NEEDED;
 462     } else {
 463         major = GSS_S_DEFECTIVE_TOKEN;
 464     }
 465
 466 cleanup:
 467     if (resp != NULL) {
 468         OM_uint32 tmpMajor;
 469         gss_buffer_desc respBuf;
 470
 471         assert(major == GSS_S_CONTINUE_NEEDED);
 472
 473         respBuf.length = wpabuf_len(resp);
 474         respBuf.value = (void *)wpabuf_head(resp);
 475
 476         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 477         if (GSS_ERROR(tmpMajor)) {
 478             major = tmpMajor;
 479             *minor = tmpMinor;
 480         }
 481     }
 482
 483     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 484     peerConfigFree(&tmpMinor, ctx);
 485
 486     return major;
 487 }
 488
 489 static OM_uint32
 490 makeGssChannelBindings(OM_uint32 *minor,
 491                        gss_cred_id_t cred,
 492                        gss_ctx_id_t ctx,
 493                        gss_channel_bindings_t chanBindings,
 494                        gss_buffer_t outputToken)
 495 {
 496     OM_uint32 major;
 497     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 498
 499     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 500         buffer = chanBindings->application_data;
 501
 502     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 503                        &buffer, NULL, outputToken);
 504     if (GSS_ERROR(major))
 505         return major;
 506
 507     return GSS_S_COMPLETE;
 508 }
 509
 510 static struct gss_eap_extension_provider
 511 eapGssMakeInitExtensions[] = {
 512     { EXT_TYPE_GSS_CHANNEL_BINDINGS, 1, makeGssChannelBindings },
 513 };
 514
 515 static OM_uint32
 516 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 517                           gss_cred_id_t cred,
 518                           gss_ctx_id_t ctx,
 519                           gss_name_t target,
 520                           gss_OID mech,
 521                           OM_uint32 reqFlags,
 522                           OM_uint32 timeReq,
 523                           gss_channel_bindings_t chanBindings,
 524                           gss_buffer_t inputToken,
 525                           gss_buffer_t outputToken)
 526 {
 527     OM_uint32 major;
 528
 529     major = gssEapMakeExtensions(minor, cred, ctx, eapGssMakeInitExtensions,
 530                                  sizeof(eapGssMakeInitExtensions) /
 531                                     sizeof(eapGssMakeInitExtensions[0]),
 532                                  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     return GSS_S_CONTINUE_NEEDED;
 541 }
 542
 543 static OM_uint32
 544 verifyReauthCreds(OM_uint32 *minor,
 545                   gss_cred_id_t cred,
 546                   gss_ctx_id_t ctx,
 547                   gss_channel_bindings_t chanBindings,
 548                   gss_buffer_t inputToken)
 549 {
 550 #ifdef GSSEAP_ENABLE_REAUTH
 551     return gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 552 #else
 553     return GSS_S_UNAVAILABLE;
 554 #endif
 555 }
 556
 557 static struct gss_eap_extension_provider
 558 eapGssVerifyAcceptExtensions[] = {
 559     { EXT_TYPE_REAUTH_CREDS, 0, verifyReauthCreds },
 560 };
 561
 562 static OM_uint32
 563 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 564                            gss_cred_id_t cred,
 565                            gss_ctx_id_t ctx,
 566                            gss_name_t target,
 567                            gss_OID mech,
 568                            OM_uint32 reqFlags,
 569                            OM_uint32 timeReq,
 570                            gss_channel_bindings_t chanBindings,
 571                            gss_buffer_t inputToken,
 572                            gss_buffer_t outputToken)
 573 {
 574     OM_uint32 major;
 575
 576     major = gssEapVerifyExtensions(minor, cred, ctx, eapGssVerifyAcceptExtensions,
 577                                    sizeof(eapGssVerifyAcceptExtensions) /
 578                                         sizeof(eapGssVerifyAcceptExtensions[0]),
 579                                    chanBindings, inputToken);
 580     if (GSS_ERROR(major))
 581         return major;
 582
 583     ctx->state = EAP_STATE_ESTABLISHED;
 584
 585     return GSS_S_COMPLETE;
 586 }
 587
 588 static OM_uint32
 589 eapGssSmInitEstablished(OM_uint32 *minor,
 590                         gss_cred_id_t cred,
 591                         gss_ctx_id_t ctx,
 592                         gss_name_t target,
 593                         gss_OID mech,
 594                         OM_uint32 reqFlags,
 595                         OM_uint32 timeReq,
 596                         gss_channel_bindings_t chanBindings,
 597                         gss_buffer_t inputToken,
 598                         gss_buffer_t outputToken)
 599 {
 600     /* Called with already established context */
 601     *minor = EINVAL;
 602     return GSS_S_BAD_STATUS;
 603 }
 604
 605 static struct gss_eap_initiator_sm {
 606     enum gss_eap_token_type inputTokenType;
 607     enum gss_eap_token_type outputTokenType;
 608     OM_uint32 (*processToken)(OM_uint32 *,
 609                               gss_cred_id_t,
 610                               gss_ctx_id_t,
 611                               gss_name_t,
 612                               gss_OID,
 613                               OM_uint32,
 614                               OM_uint32,
 615                               gss_channel_bindings_t,
 616                               gss_buffer_t,
 617                               gss_buffer_t);
 618 } eapGssInitiatorSm[] = {
 619     { TOK_TYPE_NONE,    TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 620     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 621     { TOK_TYPE_NONE,    TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 622     { TOK_TYPE_EXT_RESP,TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 623     { TOK_TYPE_NONE,    TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 624 #ifdef GSSEAP_ENABLE_REAUTH
 625     { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth           },
 626 #endif
 627 };
 628
 629 OM_uint32
 630 gss_init_sec_context(OM_uint32 *minor,
 631                      gss_cred_id_t cred,
 632                      gss_ctx_id_t *context_handle,
 633                      gss_name_t target_name,
 634                      gss_OID mech_type,
 635                      OM_uint32 req_flags,
 636                      OM_uint32 time_req,
 637                      gss_channel_bindings_t input_chan_bindings,
 638                      gss_buffer_t input_token,
 639                      gss_OID *actual_mech_type,
 640                      gss_buffer_t output_token,
 641                      OM_uint32 *ret_flags,
 642                      OM_uint32 *time_rec)
 643 {
 644     OM_uint32 major;
 645     OM_uint32 tmpMajor, tmpMinor;
 646     gss_ctx_id_t ctx = *context_handle;
 647     struct gss_eap_initiator_sm *sm = NULL;
 648     gss_buffer_desc innerInputToken;
 649     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 650     enum gss_eap_token_type tokType;
 651     gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
 652     int initialContextToken = 0;
 653
 654     *minor = 0;
 655
 656     output_token->length = 0;
 657     output_token->value = NULL;
 658
 659     if (ctx == GSS_C_NO_CONTEXT) {
 660         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 661             return GSS_S_DEFECTIVE_TOKEN;
 662         }
 663
 664         major = gssEapAllocContext(minor, &ctx);
 665         if (GSS_ERROR(major))
 666             return major;
 667
 668         ctx->flags |= CTX_FLAG_INITIATOR;
 669
 670         initialContextToken = 1;
 671         *context_handle = ctx;
 672     }
 673
 674     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 675
 676     if (cred == GSS_C_NO_CREDENTIAL) {
 677         if (ctx->initiatorCtx.defaultCred == GSS_C_NO_CREDENTIAL) {
 678             major = gssEapAcquireCred(minor,
 679                                       GSS_C_NO_NAME,
 680                                       GSS_C_NO_BUFFER,
 681                                       time_req,
 682                                       GSS_C_NO_OID_SET,
 683                                       GSS_C_INITIATE,
 684                                       &defaultCred,
 685                                       NULL,
 686                                       NULL);
 687             if (GSS_ERROR(major))
 688                 goto cleanup;
 689         }
 690
 691         cred = ctx->initiatorCtx.defaultCred;
 692     }
 693
 694     GSSEAP_MUTEX_LOCK(&cred->mutex);
 695
 696 #ifdef GSSEAP_ENABLE_REAUTH
 697     if (initialContextToken && gssEapCanReauthP(cred, target_name, time_req))
 698             ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 699 #endif
 700
 701     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 702         major = GSS_S_NO_CRED;
 703         goto cleanup;
 704     }
 705
 706     sm = &eapGssInitiatorSm[ctx->state];
 707
 708     if (input_token != GSS_C_NO_BUFFER) {
 709         major = gssEapVerifyToken(minor, ctx, input_token,
 710                                   &tokType, &innerInputToken);
 711         if (GSS_ERROR(major))
 712             goto cleanup;
 713
 714         if (tokType != sm->inputTokenType) {
 715             major = GSS_S_DEFECTIVE_TOKEN;
 716             goto cleanup;
 717         }
 718     } else {
 719         innerInputToken.length = 0;
 720         innerInputToken.value = NULL;
 721     }
 722
 723     /*
 724      * Advance through state machine whilst empty tokens are emitted and
 725      * the status is not GSS_S_COMPLETE or an error status.
 726      */
 727     do {
 728         sm = &eapGssInitiatorSm[ctx->state];
 729
 730         major = (sm->processToken)(minor,
 731                                    cred,
 732                                    ctx,
 733                                    target_name,
 734                                    mech_type,
 735                                    req_flags,
 736                                    time_req,
 737                                    input_chan_bindings,
 738                                    &innerInputToken,
 739                                    &innerOutputToken);
 740         if (GSS_ERROR(major))
 741             goto cleanup;
 742     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 743
 744     if (actual_mech_type != NULL) {
 745         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 746             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 747     }
 748     if (innerOutputToken.value != NULL) {
 749         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 750                                    sm->outputTokenType, output_token);
 751         if (GSS_ERROR(tmpMajor)) {
 752             major = tmpMajor;
 753             *minor = tmpMinor;
 754             goto cleanup;
 755         }
 756     }
 757     if (ret_flags != NULL)
 758         *ret_flags = ctx->gssFlags;
 759     if (time_rec != NULL)
 760         gssEapContextTime(&tmpMinor, ctx, time_rec);
 761
 762     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 763
 764 cleanup:
 765     if (cred != GSS_C_NO_CREDENTIAL)
 766         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 767     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 768
 769     if (GSS_ERROR(major))
 770         gssEapReleaseContext(&tmpMinor, context_handle);
 771
 772     gss_release_buffer(&tmpMinor, &innerOutputToken);
 773
 774     return major;
 775 }
 776
 777 #ifdef GSSEAP_ENABLE_REAUTH
 778 static OM_uint32
 779 eapGssSmInitGssReauth(OM_uint32 *minor,
 780                       gss_cred_id_t cred,
 781                       gss_ctx_id_t ctx,
 782                       gss_name_t target,
 783                       gss_OID mech,
 784                       OM_uint32 reqFlags,
 785                       OM_uint32 timeReq,
 786                       gss_channel_bindings_t chanBindings,
 787                       gss_buffer_t inputToken,
 788                       gss_buffer_t outputToken)
 789 {
 790     OM_uint32 major, tmpMinor;
 791     gss_name_t mechTarget = GSS_C_NO_NAME;
 792     gss_OID actualMech = GSS_C_NO_OID;
 793     OM_uint32 gssFlags, timeRec;
 794
 795     assert(cred != GSS_C_NO_CREDENTIAL);
 796
 797     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 798
 799     if (inputToken->length == 0) {
 800         major = initBegin(minor, cred, ctx, target, mech,
 801                           reqFlags, timeReq, chanBindings,
 802                           inputToken, outputToken);
 803         if (GSS_ERROR(major))
 804             goto cleanup;
 805     }
 806
 807     major = gssEapMechToGlueName(minor, target, &mechTarget);
 808     if (GSS_ERROR(major))
 809         goto cleanup;
 810
 811     major = gssInitSecContext(minor,
 812                               cred->krbCred,
 813                               &ctx->kerberosCtx,
 814                               mechTarget,
 815                               (gss_OID)gss_mech_krb5,
 816                               reqFlags, /* | GSS_C_DCE_STYLE, */
 817                               timeReq,
 818                               chanBindings,
 819                               inputToken,
 820                               &actualMech,
 821                               outputToken,
 822                               &gssFlags,
 823                               &timeRec);
 824     if (GSS_ERROR(major))
 825         goto cleanup;
 826
 827     ctx->gssFlags = gssFlags;
 828
 829     if (major == GSS_S_COMPLETE) {
 830         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 831         if (GSS_ERROR(major))
 832             goto cleanup;
 833         ctx->state = EAP_STATE_ESTABLISHED;
 834     }
 835
 836 cleanup:
 837     gssReleaseName(&tmpMinor, &mechTarget);
 838
 839     return major;
 840 }
 841 #endif /* GSSEAP_ENABLE_REAUTH */