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     if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
 225         *minor = GSSEAP_BAD_INITIATOR_NAME;
 226         return GSS_S_BAD_NAME;
 227     }
 228
 229     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 230     if (code != 0) {
 231         *minor = code;
 232         return GSS_S_FAILURE;
 233     }
 234
 235     eapPeerConfig->identity = (unsigned char *)identity;
 236     eapPeerConfig->identity_len = strlen(identity);
 237     eapPeerConfig->password = (unsigned char *)cred->password.value;
 238     eapPeerConfig->password_len = cred->password.length;
 239
 240     *minor = 0;
 241     return GSS_S_COMPLETE;
 242 }
 243
 244 static OM_uint32
 245 peerConfigFree(OM_uint32 *minor,
 246                gss_ctx_id_t ctx)
 247 {
 248     krb5_context krbContext;
 249     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 250
 251     GSSEAP_KRB_INIT(&krbContext);
 252
 253     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 254
 255     *minor = 0;
 256     return GSS_S_COMPLETE;
 257 }
 258
 259 /*
 260  * Mark an initiator context as ready for cryptographic operations
 261  */
 262 static OM_uint32
 263 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 264 {
 265     OM_uint32 major;
 266     const unsigned char *key;
 267     size_t keyLength;
 268
 269 #if 1
 270     /* XXX actually check for mutual auth */
 271     if (reqFlags & GSS_C_MUTUAL_FLAG)
 272         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 273 #endif
 274
 275     /* Cache encryption type derived from selected mechanism OID */
 276     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 277     if (GSS_ERROR(major))
 278         return major;
 279
 280     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 281         *minor = GSSEAP_KEY_UNAVAILABLE;
 282         return GSS_S_UNAVAILABLE;
 283     }
 284
 285     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 286
 287     if (keyLength < EAP_EMSK_LEN) {
 288         *minor = GSSEAP_KEY_TOO_SHORT;
 289         return GSS_S_UNAVAILABLE;
 290     }
 291
 292     major = gssEapDeriveRfc3961Key(minor,
 293                                    &key[EAP_EMSK_LEN / 2],
 294                                    EAP_EMSK_LEN / 2,
 295                                    ctx->encryptionType,
 296                                    &ctx->rfc3961Key);
 297        if (GSS_ERROR(major))
 298            return major;
 299
 300     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 301                                       &ctx->checksumType);
 302     if (GSS_ERROR(major))
 303         return major;
 304
 305     major = sequenceInit(minor,
 306                          &ctx->seqState,
 307                          ctx->recvSeq,
 308                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 309                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 310                          TRUE);
 311     if (GSS_ERROR(major))
 312         return major;
 313
 314     *minor = 0;
 315     return GSS_S_COMPLETE;
 316 }
 317
 318 static OM_uint32
 319 initBegin(OM_uint32 *minor,
 320           gss_cred_id_t cred,
 321           gss_ctx_id_t ctx,
 322           gss_name_t target,
 323           gss_OID mech,
 324           OM_uint32 reqFlags,
 325           OM_uint32 timeReq,
 326           gss_channel_bindings_t chanBindings,
 327           gss_buffer_t inputToken,
 328           gss_buffer_t outputToken)
 329 {
 330     OM_uint32 major;
 331
 332     assert(cred != GSS_C_NO_CREDENTIAL);
 333
 334     if (cred->expiryTime)
 335         ctx->expiryTime = cred->expiryTime;
 336     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 337         ctx->expiryTime = 0;
 338     else
 339         ctx->expiryTime = time(NULL) + timeReq;
 340
 341     /*
 342      * The credential mutex protects its name, however we need to
 343      * explicitly lock the acceptor name (unlikely as it may be
 344      * that it has attributes set on it).
 345      */
 346     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 347     if (GSS_ERROR(major))
 348         return major;
 349
 350     GSSEAP_MUTEX_LOCK(&target->mutex);
 351
 352     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 353     if (GSS_ERROR(major)) {
 354         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 355         return major;
 356     }
 357
 358     GSSEAP_MUTEX_UNLOCK(&target->mutex);
 359
 360     if (mech == GSS_C_NULL_OID) {
 361         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 362     } else if (gssEapIsConcreteMechanismOid(mech)) {
 363         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 364             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 365     } else {
 366         *minor = GSSEAP_WRONG_MECH;
 367         major = GSS_S_BAD_MECH;
 368     }
 369     if (GSS_ERROR(major))
 370         return major;
 371
 372     /* If credentials were provided, check they're usable with this mech */
 373     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 374         *minor = GSSEAP_CRED_MECH_MISMATCH;
 375         return GSS_S_BAD_MECH;
 376     }
 377
 378     *minor = 0;
 379     return GSS_S_COMPLETE;
 380 }
 381
 382 static OM_uint32
 383 eapGssSmInitIdentity(OM_uint32 *minor,
 384                      gss_cred_id_t cred,
 385                      gss_ctx_id_t ctx,
 386                      gss_name_t target,
 387                      gss_OID mech,
 388                      OM_uint32 reqFlags,
 389                      OM_uint32 timeReq,
 390                      gss_channel_bindings_t chanBindings,
 391                      gss_buffer_t inputToken,
 392                      gss_buffer_t outputToken)
 393 {
 394     OM_uint32 major;
 395     int initialContextToken;
 396
 397     initialContextToken = (inputToken->length == 0);
 398     if (!initialContextToken) {
 399         *minor = GSSEAP_WRONG_SIZE;
 400         return GSS_S_DEFECTIVE_TOKEN;
 401     }
 402
 403     major = initBegin(minor, cred, ctx, target, mech,
 404                       reqFlags, timeReq, chanBindings,
 405                       inputToken, outputToken);
 406     if (GSS_ERROR(major))
 407         return major;
 408
 409     ctx->state = EAP_STATE_AUTHENTICATE;
 410
 411     *minor = 0;
 412     return GSS_S_CONTINUE_NEEDED;
 413 }
 414
 415 static struct wpabuf emptyWpaBuffer;
 416
 417 static OM_uint32
 418 eapGssSmInitAuthenticate(OM_uint32 *minor,
 419                          gss_cred_id_t cred,
 420                          gss_ctx_id_t ctx,
 421                          gss_name_t target,
 422                          gss_OID mech,
 423                          OM_uint32 reqFlags,
 424                          OM_uint32 timeReq,
 425                          gss_channel_bindings_t chanBindings,
 426                          gss_buffer_t inputToken,
 427                          gss_buffer_t outputToken)
 428 {
 429     OM_uint32 major;
 430     OM_uint32 tmpMinor;
 431     int code;
 432     struct wpabuf *resp = NULL;
 433     int initialContextToken;
 434
 435     *minor = 0;
 436
 437     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 438                            inputToken->length == 0);
 439
 440     major = peerConfigInit(minor, cred, ctx);
 441     if (GSS_ERROR(major))
 442         goto cleanup;
 443
 444     if (ctx->initiatorCtx.eap == NULL) {
 445         struct eap_config eapConfig;
 446
 447         memset(&eapConfig, 0, sizeof(eapConfig));
 448
 449         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 450                                                  &gssEapPolicyCallbacks,
 451                                                  ctx,
 452                                                  &eapConfig);
 453         if (ctx->initiatorCtx.eap == NULL) {
 454             *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 455             major = GSS_S_FAILURE;
 456             goto cleanup;
 457         }
 458
 459         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 460     }
 461
 462     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 463
 464     wpabuf_set(&ctx->initiatorCtx.reqData,
 465                inputToken->value, inputToken->length);
 466
 467     major = GSS_S_CONTINUE_NEEDED;
 468
 469     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 470     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 471         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 472
 473         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 474     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 475         major = initReady(minor, ctx, reqFlags);
 476         if (GSS_ERROR(major))
 477             goto cleanup;
 478
 479         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 480         major = GSS_S_CONTINUE_NEEDED;
 481         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 482     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 483         *minor = GSSEAP_PEER_AUTH_FAILURE;
 484         major = GSS_S_DEFECTIVE_CREDENTIAL;
 485     } else if (code == 0 && initialContextToken) {
 486         resp = &emptyWpaBuffer;
 487         major = GSS_S_CONTINUE_NEEDED;
 488     } else {
 489         *minor = GSSEAP_PEER_BAD_MESSAGE;
 490         major = GSS_S_DEFECTIVE_TOKEN;
 491     }
 492
 493 cleanup:
 494     if (resp != NULL) {
 495         OM_uint32 tmpMajor;
 496         gss_buffer_desc respBuf;
 497
 498         assert(major == GSS_S_CONTINUE_NEEDED);
 499
 500         respBuf.length = wpabuf_len(resp);
 501         respBuf.value = (void *)wpabuf_head(resp);
 502
 503         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 504         if (GSS_ERROR(tmpMajor)) {
 505             major = tmpMajor;
 506             *minor = tmpMinor;
 507         }
 508     }
 509
 510     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 511     peerConfigFree(&tmpMinor, ctx);
 512
 513     return major;
 514 }
 515
 516 static OM_uint32
 517 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 518                           gss_cred_id_t cred,
 519                           gss_ctx_id_t ctx,
 520                           gss_name_t target,
 521                           gss_OID mech,
 522                           OM_uint32 reqFlags,
 523                           OM_uint32 timeReq,
 524                           gss_channel_bindings_t chanBindings,
 525                           gss_buffer_t inputToken,
 526                           gss_buffer_t outputToken)
 527 {
 528     OM_uint32 major;
 529
 530     major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
 531     if (GSS_ERROR(major))
 532         return major;
 533
 534     assert(outputToken->value != NULL);
 535
 536     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 537
 538     *minor = 0;
 539     return GSS_S_CONTINUE_NEEDED;
 540 }
 541
 542 static OM_uint32
 543 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 544                            gss_cred_id_t cred,
 545                            gss_ctx_id_t ctx,
 546                            gss_name_t target,
 547                            gss_OID mech,
 548                            OM_uint32 reqFlags,
 549                            OM_uint32 timeReq,
 550                            gss_channel_bindings_t chanBindings,
 551                            gss_buffer_t inputToken,
 552                            gss_buffer_t outputToken)
 553 {
 554     OM_uint32 major;
 555
 556     major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
 557     if (GSS_ERROR(major))
 558         return major;
 559
 560     ctx->state = EAP_STATE_ESTABLISHED;
 561
 562     *minor = 0;
 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 = GSSEAP_CONTEXT_ESTABLISHED;
 580     return GSS_S_BAD_STATUS;
 581 }
 582
 583 static OM_uint32
 584 eapGssSmInitError(OM_uint32 *minor,
 585                   gss_cred_id_t cred,
 586                   gss_ctx_id_t ctx,
 587                   gss_name_t target,
 588                   gss_OID mech,
 589                   OM_uint32 reqFlags,
 590                   OM_uint32 timeReq,
 591                   gss_channel_bindings_t chanBindings,
 592                   gss_buffer_t inputToken,
 593                   gss_buffer_t outputToken)
 594 {
 595     OM_uint32 major;
 596     unsigned char *p;
 597
 598     if (inputToken->length < 8) {
 599         *minor = GSSEAP_TOK_TRUNC;
 600         return GSS_S_DEFECTIVE_TOKEN;
 601     }
 602
 603     p = (unsigned char *)inputToken->value;
 604
 605     major = load_uint32_be(&p[0]);
 606     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 607
 608     if (!GSS_ERROR(major)) {
 609         *minor = GSSEAP_BAD_ERROR_TOKEN;
 610         major = GSS_S_FAILURE;
 611     }
 612
 613     return major;
 614 }
 615
 616 static struct gss_eap_initiator_sm {
 617     enum gss_eap_token_type inputTokenType;
 618     enum gss_eap_token_type outputTokenType;
 619     OM_uint32 (*processToken)(OM_uint32 *,
 620                               gss_cred_id_t,
 621                               gss_ctx_id_t,
 622                               gss_name_t,
 623                               gss_OID,
 624                               OM_uint32,
 625                               OM_uint32,
 626                               gss_channel_bindings_t,
 627                               gss_buffer_t,
 628                               gss_buffer_t);
 629 } eapGssInitiatorSm[] = {
 630     { TOK_TYPE_NONE,        TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 631     { TOK_TYPE_EAP_REQ,     TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 632     { TOK_TYPE_NONE,        TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 633     { TOK_TYPE_EXT_RESP,    TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 634     { TOK_TYPE_NONE,        TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 635     { TOK_TYPE_CONTEXT_ERR, TOK_TYPE_NONE,          eapGssSmInitError               },
 636 #ifdef GSSEAP_ENABLE_REAUTH
 637     { TOK_TYPE_GSS_REAUTH,  TOK_TYPE_GSS_REAUTH,    eapGssSmInitGssReauth           },
 638 #endif
 639 };
 640
 641 OM_uint32
 642 gss_init_sec_context(OM_uint32 *minor,
 643                      gss_cred_id_t cred,
 644                      gss_ctx_id_t *context_handle,
 645                      gss_name_t target_name,
 646                      gss_OID mech_type,
 647                      OM_uint32 req_flags,
 648                      OM_uint32 time_req,
 649                      gss_channel_bindings_t input_chan_bindings,
 650                      gss_buffer_t input_token,
 651                      gss_OID *actual_mech_type,
 652                      gss_buffer_t output_token,
 653                      OM_uint32 *ret_flags,
 654                      OM_uint32 *time_rec)
 655 {
 656     OM_uint32 major;
 657     OM_uint32 tmpMajor, tmpMinor;
 658     gss_ctx_id_t ctx = *context_handle;
 659     struct gss_eap_initiator_sm *sm = NULL;
 660     gss_buffer_desc innerInputToken;
 661     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 662     enum gss_eap_token_type tokType;
 663     gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
 664     int initialContextToken = 0;
 665
 666     *minor = 0;
 667
 668     output_token->length = 0;
 669     output_token->value = NULL;
 670
 671     if (ctx == GSS_C_NO_CONTEXT) {
 672         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 673             *minor = GSSEAP_WRONG_SIZE;
 674             return GSS_S_DEFECTIVE_TOKEN;
 675         }
 676
 677         major = gssEapAllocContext(minor, &ctx);
 678         if (GSS_ERROR(major))
 679             return major;
 680
 681         ctx->flags |= CTX_FLAG_INITIATOR;
 682
 683         initialContextToken = 1;
 684         *context_handle = ctx;
 685     }
 686
 687     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 688
 689     if (cred == GSS_C_NO_CREDENTIAL) {
 690         if (ctx->initiatorCtx.defaultCred == GSS_C_NO_CREDENTIAL) {
 691             major = gssEapAcquireCred(minor,
 692                                       GSS_C_NO_NAME,
 693                                       GSS_C_NO_BUFFER,
 694                                       time_req,
 695                                       GSS_C_NO_OID_SET,
 696                                       GSS_C_INITIATE,
 697                                       &defaultCred,
 698                                       NULL,
 699                                       NULL);
 700             if (GSS_ERROR(major))
 701                 goto cleanup;
 702         }
 703
 704         cred = ctx->initiatorCtx.defaultCred;
 705     }
 706
 707     GSSEAP_MUTEX_LOCK(&cred->mutex);
 708
 709 #ifdef GSSEAP_ENABLE_REAUTH
 710     if (initialContextToken && gssEapCanReauthP(cred, target_name, time_req))
 711         ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 712 #endif
 713
 714     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 715         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 716         major = GSS_S_NO_CRED;
 717         goto cleanup;
 718     }
 719
 720     sm = &eapGssInitiatorSm[ctx->state];
 721
 722     if (input_token != GSS_C_NO_BUFFER) {
 723         major = gssEapVerifyToken(minor, ctx, input_token,
 724                                   &tokType, &innerInputToken);
 725         if (GSS_ERROR(major))
 726             goto cleanup;
 727
 728         if (tokType == TOK_TYPE_CONTEXT_ERR) {
 729             ctx->state = EAP_STATE_ERROR;
 730         } else if (tokType != sm->inputTokenType) {
 731             *minor = GSSEAP_WRONG_TOK_ID;
 732             major = GSS_S_DEFECTIVE_TOKEN;
 733             goto cleanup;
 734         }
 735     } else {
 736         innerInputToken.length = 0;
 737         innerInputToken.value = NULL;
 738     }
 739
 740     /*
 741      * Advance through state machine whilst empty tokens are emitted and
 742      * the status is not GSS_S_COMPLETE or an error status.
 743      */
 744     do {
 745         sm = &eapGssInitiatorSm[ctx->state];
 746
 747         major = (sm->processToken)(minor,
 748                                    cred,
 749                                    ctx,
 750                                    target_name,
 751                                    mech_type,
 752                                    req_flags,
 753                                    time_req,
 754                                    input_chan_bindings,
 755                                    &innerInputToken,
 756                                    &innerOutputToken);
 757         if (GSS_ERROR(major))
 758             goto cleanup;
 759     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 760
 761     if (actual_mech_type != NULL) {
 762         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 763             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 764     }
 765     if (innerOutputToken.value != NULL) {
 766         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 767                                    sm->outputTokenType, output_token);
 768         if (GSS_ERROR(tmpMajor)) {
 769             major = tmpMajor;
 770             *minor = tmpMinor;
 771             goto cleanup;
 772         }
 773     }
 774     if (ret_flags != NULL)
 775         *ret_flags = ctx->gssFlags;
 776     if (time_rec != NULL)
 777         gssEapContextTime(&tmpMinor, ctx, time_rec);
 778
 779     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 780
 781 cleanup:
 782     if (cred != GSS_C_NO_CREDENTIAL)
 783         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 784     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 785
 786     if (GSS_ERROR(major))
 787         gssEapReleaseContext(&tmpMinor, context_handle);
 788
 789     gss_release_buffer(&tmpMinor, &innerOutputToken);
 790
 791     return major;
 792 }
 793
 794 #ifdef GSSEAP_ENABLE_REAUTH
 795 static OM_uint32
 796 eapGssSmInitGssReauth(OM_uint32 *minor,
 797                       gss_cred_id_t cred,
 798                       gss_ctx_id_t ctx,
 799                       gss_name_t target,
 800                       gss_OID mech,
 801                       OM_uint32 reqFlags,
 802                       OM_uint32 timeReq,
 803                       gss_channel_bindings_t chanBindings,
 804                       gss_buffer_t inputToken,
 805                       gss_buffer_t outputToken)
 806 {
 807     OM_uint32 major, tmpMinor;
 808     gss_name_t mechTarget = GSS_C_NO_NAME;
 809     gss_OID actualMech = GSS_C_NO_OID;
 810     OM_uint32 gssFlags, timeRec;
 811
 812     assert(cred != GSS_C_NO_CREDENTIAL);
 813
 814     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 815
 816     if (inputToken->length == 0) {
 817         major = initBegin(minor, cred, ctx, target, mech,
 818                           reqFlags, timeReq, chanBindings,
 819                           inputToken, outputToken);
 820         if (GSS_ERROR(major))
 821             goto cleanup;
 822     }
 823
 824     major = gssEapMechToGlueName(minor, target, &mechTarget);
 825     if (GSS_ERROR(major))
 826         goto cleanup;
 827
 828     major = gssInitSecContext(minor,
 829                               cred->krbCred,
 830                               &ctx->kerberosCtx,
 831                               mechTarget,
 832                               (gss_OID)gss_mech_krb5,
 833                               reqFlags, /* | GSS_C_DCE_STYLE, */
 834                               timeReq,
 835                               chanBindings,
 836                               inputToken,
 837                               &actualMech,
 838                               outputToken,
 839                               &gssFlags,
 840                               &timeRec);
 841     if (GSS_ERROR(major))
 842         goto cleanup;
 843
 844     ctx->gssFlags = gssFlags;
 845
 846     if (major == GSS_S_COMPLETE) {
 847         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 848         if (GSS_ERROR(major))
 849             goto cleanup;
 850         ctx->state = EAP_STATE_ESTABLISHED;
 851     }
 852
 853 cleanup:
 854     gssReleaseName(&tmpMinor, &mechTarget);
 855
 856     return major;
 857 }
 858 #endif /* GSSEAP_ENABLE_REAUTH */