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     eapPeerConfig->identity = NULL;
 216     eapPeerConfig->identity_len = 0;
 217     eapPeerConfig->password = NULL;
 218     eapPeerConfig->password_len = 0;
 219
 220     assert(cred != GSS_C_NO_CREDENTIAL);
 221
 222     GSSEAP_KRB_INIT(&krbContext);
 223
 224     eapPeerConfig->fragment_size = 1024;
 225     wpa_debug_level = 0;
 226
 227     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 228     if (code != 0) {
 229         *minor = code;
 230         return GSS_S_FAILURE;
 231     }
 232
 233     eapPeerConfig->identity = (unsigned char *)identity;
 234     eapPeerConfig->identity_len = strlen(identity);
 235     eapPeerConfig->password = (unsigned char *)cred->password.value;
 236     eapPeerConfig->password_len = cred->password.length;
 237
 238     return GSS_S_COMPLETE;
 239 }
 240
 241 static OM_uint32
 242 peerConfigFree(OM_uint32 *minor,
 243                gss_ctx_id_t ctx)
 244 {
 245     krb5_context krbContext;
 246     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 247
 248     GSSEAP_KRB_INIT(&krbContext);
 249
 250     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 251
 252     return GSS_S_COMPLETE;
 253 }
 254
 255 static OM_uint32
 256 initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
 257 {
 258     OM_uint32 major;
 259     const unsigned char *key;
 260     size_t keyLength;
 261     krb5_enctype encryptionType;
 262     int gotKey = 0;
 263
 264     /* Cache encryption type derived from selected mechanism OID */
 265     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &encryptionType);
 266     if (GSS_ERROR(major))
 267         return major;
 268
 269     if (encryptionType != ENCTYPE_NULL &&
 270         eap_key_available(ctx->initiatorCtx.eap)) {
 271         key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 272
 273         if (keyLength >= EAP_EMSK_LEN) {
 274             major = gssEapDeriveRfc3961Key(minor,
 275                                            &key[EAP_EMSK_LEN / 2],
 276                                            EAP_EMSK_LEN / 2,
 277                                            encryptionType,
 278                                            &ctx->rfc3961Key);
 279                if (GSS_ERROR(major))
 280                    return major;
 281
 282             major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 283                                               &ctx->checksumType);
 284             if (GSS_ERROR(major))
 285                 return major;
 286             gotKey++;
 287         }
 288     }
 289
 290     if (gotKey) {
 291         ctx->encryptionType = encryptionType;
 292     } else {
 293         /*
 294          * draft-howlett-eap-gss says that integrity/confidentialty should
 295          * always be advertised as available, but if we have no keying
 296          * material it seems confusing to the caller to advertise this.
 297          */
 298         ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
 299     }
 300
 301     major = sequenceInit(minor,
 302                          &ctx->seqState,
 303                          ctx->recvSeq,
 304                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 305                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 306                          TRUE);
 307     if (GSS_ERROR(major))
 308         return major;
 309
 310     return GSS_S_COMPLETE;
 311 }
 312
 313 static OM_uint32
 314 initBegin(OM_uint32 *minor,
 315           gss_cred_id_t cred,
 316           gss_ctx_id_t ctx,
 317           gss_name_t target,
 318           gss_OID mech,
 319           OM_uint32 reqFlags,
 320           OM_uint32 timeReq,
 321           gss_channel_bindings_t chanBindings,
 322           gss_buffer_t inputToken,
 323           gss_buffer_t outputToken)
 324 {
 325     OM_uint32 major;
 326
 327     assert(cred != GSS_C_NO_CREDENTIAL);
 328
 329     if (cred->expiryTime)
 330         ctx->expiryTime = cred->expiryTime;
 331     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 332         ctx->expiryTime = 0;
 333     else
 334         ctx->expiryTime = time(NULL) + timeReq;
 335
 336     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 337     if (GSS_ERROR(major))
 338         return major;
 339
 340     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 341     if (GSS_ERROR(major))
 342         return major;
 343
 344     if (mech == GSS_C_NULL_OID || oidEqual(mech, GSS_EAP_MECHANISM)) {
 345         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 346     } else if (gssEapIsConcreteMechanismOid(mech)) {
 347         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 348             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 349     } else {
 350         major = GSS_S_BAD_MECH;
 351     }
 352     if (GSS_ERROR(major))
 353         return major;
 354
 355     /* If credentials were provided, check they're usable with this mech */
 356     if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
 357         return GSS_S_BAD_MECH;
 358
 359     return GSS_S_COMPLETE;
 360 }
 361
 362 static OM_uint32
 363 eapGssSmInitIdentity(OM_uint32 *minor,
 364                      gss_cred_id_t cred,
 365                      gss_ctx_id_t ctx,
 366                      gss_name_t target,
 367                      gss_OID mech,
 368                      OM_uint32 reqFlags,
 369                      OM_uint32 timeReq,
 370                      gss_channel_bindings_t chanBindings,
 371                      gss_buffer_t inputToken,
 372                      gss_buffer_t outputToken)
 373 {
 374     OM_uint32 major;
 375     int initialContextToken;
 376
 377     initialContextToken = (inputToken->length == 0);
 378     if (!initialContextToken)
 379         return GSS_S_DEFECTIVE_TOKEN;
 380
 381     major = initBegin(minor, cred, ctx, target, mech,
 382                       reqFlags, timeReq, chanBindings,
 383                       inputToken, outputToken);
 384     if (GSS_ERROR(major))
 385         return major;
 386
 387     ctx->state = EAP_STATE_AUTHENTICATE;
 388
 389     return GSS_S_CONTINUE_NEEDED;
 390 }
 391
 392 static struct wpabuf emptyWpaBuffer;
 393
 394 static OM_uint32
 395 eapGssSmInitAuthenticate(OM_uint32 *minor,
 396                          gss_cred_id_t cred,
 397                          gss_ctx_id_t ctx,
 398                          gss_name_t target,
 399                          gss_OID mech,
 400                          OM_uint32 reqFlags,
 401                          OM_uint32 timeReq,
 402                          gss_channel_bindings_t chanBindings,
 403                          gss_buffer_t inputToken,
 404                          gss_buffer_t outputToken)
 405 {
 406     OM_uint32 major;
 407     OM_uint32 tmpMinor;
 408     int code;
 409     struct wpabuf *resp = NULL;
 410     int initialContextToken;
 411
 412     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 413                            inputToken->length == 0);
 414
 415     major = peerConfigInit(minor, cred, ctx);
 416     if (GSS_ERROR(major))
 417         goto cleanup;
 418
 419     if (ctx->initiatorCtx.eap == NULL) {
 420         struct eap_config eapConfig;
 421
 422         memset(&eapConfig, 0, sizeof(eapConfig));
 423
 424         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 425                                                  &gssEapPolicyCallbacks,
 426                                                  ctx,
 427                                                  &eapConfig);
 428         if (ctx->initiatorCtx.eap == NULL) {
 429             major = GSS_S_FAILURE;
 430             goto cleanup;
 431         }
 432
 433         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 434     }
 435
 436     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 437
 438     wpabuf_set(&ctx->initiatorCtx.reqData,
 439                inputToken->value, inputToken->length);
 440
 441     major = GSS_S_CONTINUE_NEEDED;
 442
 443     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 444     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 445         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 446
 447         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 448     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 449         major = initReady(minor, ctx);
 450         if (GSS_ERROR(major))
 451             goto cleanup;
 452
 453         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 454         major = GSS_S_CONTINUE_NEEDED;
 455         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 456     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 457         major = GSS_S_DEFECTIVE_CREDENTIAL;
 458     } else if (code == 0 && initialContextToken) {
 459         resp = &emptyWpaBuffer;
 460         major = GSS_S_CONTINUE_NEEDED;
 461     } else {
 462         major = GSS_S_DEFECTIVE_TOKEN;
 463     }
 464
 465 cleanup:
 466     if (resp != NULL) {
 467         OM_uint32 tmpMajor;
 468         gss_buffer_desc respBuf;
 469
 470         assert(major == GSS_S_CONTINUE_NEEDED);
 471
 472         respBuf.length = wpabuf_len(resp);
 473         respBuf.value = (void *)wpabuf_head(resp);
 474
 475         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 476         if (GSS_ERROR(tmpMajor)) {
 477             major = tmpMajor;
 478             *minor = tmpMinor;
 479         }
 480     }
 481
 482     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 483     peerConfigFree(&tmpMinor, ctx);
 484
 485     return major;
 486 }
 487
 488 static OM_uint32
 489 initGssChannelBindings(OM_uint32 *minor,
 490                        gss_ctx_id_t ctx,
 491                        gss_channel_bindings_t chanBindings,
 492                        gss_buffer_t outputToken)
 493 {
 494     OM_uint32 major;
 495     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 496
 497
 498     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 499         buffer = chanBindings->application_data;
 500
 501     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 502                        &buffer, NULL, outputToken);
 503     if (GSS_ERROR(major))
 504         return major;
 505
 506     return GSS_S_CONTINUE_NEEDED;
 507 }
 508
 509 static OM_uint32
 510 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 511                           gss_cred_id_t cred,
 512                           gss_ctx_id_t ctx,
 513                           gss_name_t target,
 514                           gss_OID mech,
 515                           OM_uint32 reqFlags,
 516                           OM_uint32 timeReq,
 517                           gss_channel_bindings_t chanBindings,
 518                           gss_buffer_t inputToken,
 519                           gss_buffer_t outputToken)
 520 {
 521     OM_uint32 major, tmpMinor;
 522     gss_buffer_desc cbToken = GSS_C_EMPTY_BUFFER;
 523
 524     major = initGssChannelBindings(minor, ctx, chanBindings, &cbToken);
 525     if (GSS_ERROR(major))
 526         return major;
 527
 528     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 529
 530     major = duplicateBuffer(minor, &cbToken, outputToken);
 531     if (GSS_ERROR(major)) {
 532         gss_release_buffer(&tmpMinor, &cbToken);
 533         return major;
 534     }
 535
 536     gss_release_buffer(&tmpMinor, &cbToken);
 537
 538     return GSS_S_CONTINUE_NEEDED;
 539 }
 540
 541 static OM_uint32
 542 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 543                            gss_cred_id_t cred,
 544                            gss_ctx_id_t ctx,
 545                            gss_name_t target,
 546                            gss_OID mech,
 547                            OM_uint32 reqFlags,
 548                            OM_uint32 timeReq,
 549                            gss_channel_bindings_t chanBindings,
 550                            gss_buffer_t inputToken,
 551                            gss_buffer_t outputToken)
 552 {
 553 #ifdef GSSEAP_ENABLE_REAUTH
 554     OM_uint32 major;
 555
 556     major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 557     if (GSS_ERROR(major))
 558         return major;
 559 #endif
 560
 561     ctx->state = EAP_STATE_ESTABLISHED;
 562
 563     return GSS_S_COMPLETE;
 564 }
 565
 566 static OM_uint32
 567 eapGssSmInitEstablished(OM_uint32 *minor,
 568                         gss_cred_id_t cred,
 569                         gss_ctx_id_t ctx,
 570                         gss_name_t target,
 571                         gss_OID mech,
 572                         OM_uint32 reqFlags,
 573                         OM_uint32 timeReq,
 574                         gss_channel_bindings_t chanBindings,
 575                         gss_buffer_t inputToken,
 576                         gss_buffer_t outputToken)
 577 {
 578     /* Called with already established context */
 579     *minor = EINVAL;
 580     return GSS_S_BAD_STATUS;
 581 }
 582
 583 static struct gss_eap_initiator_sm {
 584     enum gss_eap_token_type inputTokenType;
 585     enum gss_eap_token_type outputTokenType;
 586     OM_uint32 (*processToken)(OM_uint32 *,
 587                               gss_cred_id_t,
 588                               gss_ctx_id_t,
 589                               gss_name_t,
 590                               gss_OID,
 591                               OM_uint32,
 592                               OM_uint32,
 593                               gss_channel_bindings_t,
 594                               gss_buffer_t,
 595                               gss_buffer_t);
 596 } eapGssInitiatorSm[] = {
 597     { TOK_TYPE_NONE,    TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 598     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 599     { TOK_TYPE_NONE,    TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 600     { TOK_TYPE_EXT_RESP,TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 601     { TOK_TYPE_NONE,    TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 602 #ifdef GSSEAP_ENABLE_REAUTH
 603     { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth           },
 604 #endif
 605 };
 606
 607 OM_uint32
 608 gss_init_sec_context(OM_uint32 *minor,
 609                      gss_cred_id_t cred,
 610                      gss_ctx_id_t *context_handle,
 611                      gss_name_t target_name,
 612                      gss_OID mech_type,
 613                      OM_uint32 req_flags,
 614                      OM_uint32 time_req,
 615                      gss_channel_bindings_t input_chan_bindings,
 616                      gss_buffer_t input_token,
 617                      gss_OID *actual_mech_type,
 618                      gss_buffer_t output_token,
 619                      OM_uint32 *ret_flags,
 620                      OM_uint32 *time_rec)
 621 {
 622     OM_uint32 major;
 623     OM_uint32 tmpMajor, tmpMinor;
 624     gss_ctx_id_t ctx = *context_handle;
 625     struct gss_eap_initiator_sm *sm = NULL;
 626     gss_buffer_desc innerInputToken;
 627     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 628     enum gss_eap_token_type tokType;
 629     gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
 630
 631     *minor = 0;
 632
 633     output_token->length = 0;
 634     output_token->value = NULL;
 635
 636     if (cred != GSS_C_NO_CREDENTIAL) {
 637         if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 638             major = GSS_S_NO_CRED;
 639             goto cleanup;
 640         }
 641     } else {
 642         /* XXX TODO should we store this in the context handle? */
 643         major = gssEapAcquireCred(minor, GSS_C_NO_NAME, GSS_C_NO_BUFFER,
 644                                   time_req, GSS_C_NO_OID_SET, GSS_C_INITIATE,
 645                                   &defaultCred, NULL, NULL);
 646         if (GSS_ERROR(major))
 647             goto cleanup;
 648
 649         cred = defaultCred;
 650     }
 651
 652     if (ctx == GSS_C_NO_CONTEXT) {
 653         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 654             return GSS_S_DEFECTIVE_TOKEN;
 655         }
 656
 657         major = gssEapAllocContext(minor, &ctx);
 658         if (GSS_ERROR(major))
 659             goto cleanup;
 660
 661         ctx->flags |= CTX_FLAG_INITIATOR;
 662
 663 #ifdef GSSEAP_ENABLE_REAUTH
 664         if (canReauthP(cred))
 665             ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 666 #endif
 667
 668         *context_handle = ctx;
 669     }
 670
 671     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 672
 673     sm = &eapGssInitiatorSm[ctx->state];
 674
 675     if (input_token != GSS_C_NO_BUFFER) {
 676         major = gssEapVerifyToken(minor, ctx, input_token,
 677                                   &tokType, &innerInputToken);
 678         if (GSS_ERROR(major))
 679             goto cleanup;
 680
 681         if (tokType != sm->inputTokenType) {
 682             major = GSS_S_DEFECTIVE_TOKEN;
 683             goto cleanup;
 684         }
 685     } else {
 686         innerInputToken.length = 0;
 687         innerInputToken.value = NULL;
 688     }
 689
 690     /*
 691      * Advance through state machine whilst empty tokens are emitted and
 692      * the status is not GSS_S_COMPLETE or an error status.
 693      */
 694     do {
 695         sm = &eapGssInitiatorSm[ctx->state];
 696
 697         major = (sm->processToken)(minor,
 698                                    cred,
 699                                    ctx,
 700                                    target_name,
 701                                    mech_type,
 702                                    req_flags,
 703                                    time_req,
 704                                    input_chan_bindings,
 705                                    &innerInputToken,
 706                                    &innerOutputToken);
 707         if (GSS_ERROR(major))
 708             goto cleanup;
 709     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 710
 711     if (actual_mech_type != NULL) {
 712         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 713             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 714     }
 715     if (innerOutputToken.value != NULL) {
 716         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 717                                    sm->outputTokenType, output_token);
 718         if (GSS_ERROR(tmpMajor)) {
 719             major = tmpMajor;
 720             *minor = tmpMinor;
 721             goto cleanup;
 722         }
 723     }
 724     if (ret_flags != NULL)
 725         *ret_flags = ctx->gssFlags;
 726     if (time_rec != NULL)
 727         gssEapContextTime(&tmpMinor, ctx, time_rec);
 728
 729     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 730
 731 cleanup:
 732     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 733
 734     if (GSS_ERROR(major))
 735         gssEapReleaseContext(&tmpMinor, context_handle);
 736
 737     gss_release_buffer(&tmpMinor, &innerOutputToken);
 738     gssEapReleaseCred(&tmpMinor, &defaultCred);
 739
 740     return major;
 741 }
 742
 743 #ifdef GSSEAP_ENABLE_REAUTH
 744 static int
 745 canReauthP(gss_cred_id_t cred)
 746 {
 747     return (cred != GSS_C_NO_CREDENTIAL &&
 748             cred->krbCred != GSS_C_NO_CREDENTIAL &&
 749             cred->expiryTime > time(NULL));
 750 }
 751
 752 static OM_uint32
 753 eapGssSmInitGssReauth(OM_uint32 *minor,
 754                       gss_cred_id_t cred,
 755                       gss_ctx_id_t ctx,
 756                       gss_name_t target,
 757                       gss_OID mech,
 758                       OM_uint32 reqFlags,
 759                       OM_uint32 timeReq,
 760                       gss_channel_bindings_t chanBindings,
 761                       gss_buffer_t inputToken,
 762                       gss_buffer_t outputToken)
 763 {
 764     OM_uint32 major, tmpMinor;
 765     gss_name_t mechTarget = GSS_C_NO_NAME;
 766     gss_OID actualMech = GSS_C_NO_OID;
 767     OM_uint32 gssFlags, timeRec;
 768
 769     assert(cred != GSS_C_NO_CREDENTIAL);
 770
 771     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 772
 773     if (inputToken->length == 0) {
 774         major = initBegin(minor, cred, ctx, target, mech,
 775                           reqFlags, timeReq, chanBindings,
 776                           inputToken, outputToken);
 777         if (GSS_ERROR(major))
 778             goto cleanup;
 779     }
 780
 781     major = gssEapMechToGlueName(minor, target, &mechTarget);
 782     if (GSS_ERROR(major))
 783         goto cleanup;
 784
 785     major = gssInitSecContext(minor,
 786                               cred->krbCred,
 787                               &ctx->kerberosCtx,
 788                               mechTarget,
 789                               (gss_OID)gss_mech_krb5,
 790                               reqFlags, /* | GSS_C_DCE_STYLE, */
 791                               timeReq,
 792                               chanBindings,
 793                               inputToken,
 794                               &actualMech,
 795                               outputToken,
 796                               &gssFlags,
 797                               &timeRec);
 798     if (GSS_ERROR(major))
 799         goto cleanup;
 800
 801     ctx->gssFlags = gssFlags;
 802
 803     if (major == GSS_S_COMPLETE) {
 804         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 805         if (GSS_ERROR(major))
 806             goto cleanup;
 807         ctx->state = EAP_STATE_ESTABLISHED;
 808     }
 809
 810 cleanup:
 811     gssReleaseName(&tmpMinor, &mechTarget);
 812
 813     return major;
 814 }
 815 #endif /* GSSEAP_ENABLE_REAUTH */