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 /*
  34  * Establish a security context on the initiator (client). These functions
  35  * wrap around libeap.
  36  */
  37
  38 #include "gssapiP_eap.h"
  39
  40 #ifdef GSSEAP_ENABLE_REAUTH
  41 static OM_uint32
  42 eapGssSmInitGssReauth(OM_uint32 *minor,
  43                       gss_cred_id_t cred,
  44                       gss_ctx_id_t ctx,
  45                       gss_name_t target,
  46                       gss_OID mech,
  47                       OM_uint32 reqFlags,
  48                       OM_uint32 timeReq,
  49                       gss_channel_bindings_t chanBindings,
  50                       gss_buffer_t inputToken,
  51                       gss_buffer_t outputToken);
  52 #endif
  53
  54 static OM_uint32
  55 policyVariableToFlag(enum eapol_bool_var variable)
  56 {
  57     OM_uint32 flag = 0;
  58
  59     switch (variable) {
  60     case EAPOL_eapSuccess:
  61         flag = CTX_FLAG_EAP_SUCCESS;
  62         break;
  63     case EAPOL_eapRestart:
  64         flag = CTX_FLAG_EAP_RESTART;
  65         break;
  66     case EAPOL_eapFail:
  67         flag = CTX_FLAG_EAP_FAIL;
  68         break;
  69     case EAPOL_eapResp:
  70         flag = CTX_FLAG_EAP_RESP;
  71         break;
  72     case EAPOL_eapNoResp:
  73         flag = CTX_FLAG_EAP_NO_RESP;
  74         break;
  75     case EAPOL_eapReq:
  76         flag = CTX_FLAG_EAP_REQ;
  77         break;
  78     case EAPOL_portEnabled:
  79         flag = CTX_FLAG_EAP_PORT_ENABLED;
  80         break;
  81     case EAPOL_altAccept:
  82         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  83         break;
  84     case EAPOL_altReject:
  85         flag = CTX_FLAG_EAP_ALT_REJECT;
  86         break;
  87     }
  88
  89     return flag;
  90 }
  91
  92 static struct eap_peer_config *
  93 peerGetConfig(void *ctx)
  94 {
  95     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  96
  97     return &gssCtx->initiatorCtx.eapPeerConfig;
  98 }
  99
 100 static Boolean
 101 peerGetBool(void *data, enum eapol_bool_var variable)
 102 {
 103     gss_ctx_id_t ctx = data;
 104     OM_uint32 flag;
 105
 106     if (ctx == GSS_C_NO_CONTEXT)
 107         return FALSE;
 108
 109     flag = policyVariableToFlag(variable);
 110
 111     return ((ctx->flags & flag) != 0);
 112 }
 113
 114 static void
 115 peerSetBool(void *data, enum eapol_bool_var variable,
 116             Boolean value)
 117 {
 118     gss_ctx_id_t ctx = data;
 119     OM_uint32 flag;
 120
 121     if (ctx == GSS_C_NO_CONTEXT)
 122         return;
 123
 124     flag = policyVariableToFlag(variable);
 125
 126     if (value)
 127         ctx->flags |= flag;
 128     else
 129         ctx->flags &= ~(flag);
 130 }
 131
 132 static unsigned int
 133 peerGetInt(void *data, enum eapol_int_var variable)
 134 {
 135     gss_ctx_id_t ctx = data;
 136
 137     if (ctx == GSS_C_NO_CONTEXT)
 138         return FALSE;
 139
 140     assert(CTX_IS_INITIATOR(ctx));
 141
 142     switch (variable) {
 143     case EAPOL_idleWhile:
 144         return ctx->initiatorCtx.idleWhile;
 145         break;
 146     }
 147
 148     return 0;
 149 }
 150
 151 static void
 152 peerSetInt(void *data, enum eapol_int_var variable,
 153            unsigned int value)
 154 {
 155     gss_ctx_id_t ctx = data;
 156
 157     if (ctx == GSS_C_NO_CONTEXT)
 158         return;
 159
 160     assert(CTX_IS_INITIATOR(ctx));
 161
 162     switch (variable) {
 163     case EAPOL_idleWhile:
 164         ctx->initiatorCtx.idleWhile = value;
 165         break;
 166     }
 167 }
 168
 169 static struct wpabuf *
 170 peerGetEapReqData(void *ctx)
 171 {
 172     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 173
 174     return &gssCtx->initiatorCtx.reqData;
 175 }
 176
 177 static void
 178 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 179 {
 180 }
 181
 182 static const struct wpa_config_blob *
 183 peerGetConfigBlob(void *ctx, const char *name)
 184 {
 185     return NULL;
 186 }
 187
 188 static void
 189 peerNotifyPending(void *ctx)
 190 {
 191 }
 192
 193 static struct eapol_callbacks gssEapPolicyCallbacks = {
 194     peerGetConfig,
 195     peerGetBool,
 196     peerSetBool,
 197     peerGetInt,
 198     peerSetInt,
 199     peerGetEapReqData,
 200     peerSetConfigBlob,
 201     peerGetConfigBlob,
 202     peerNotifyPending,
 203 };
 204
 205 #ifdef GSSEAP_DEBUG
 206 extern int wpa_debug_level;
 207 #endif
 208
 209 static OM_uint32
 210 peerConfigInit(OM_uint32 *minor,
 211                gss_cred_id_t cred,
 212                gss_ctx_id_t ctx)
 213 {
 214     krb5_context krbContext;
 215     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 216     krb5_error_code code;
 217     char *identity;
 218
 219     eapPeerConfig->identity = NULL;
 220     eapPeerConfig->identity_len = 0;
 221     eapPeerConfig->password = NULL;
 222     eapPeerConfig->password_len = 0;
 223
 224     assert(cred != GSS_C_NO_CREDENTIAL);
 225
 226     GSSEAP_KRB_INIT(&krbContext);
 227
 228     eapPeerConfig->fragment_size = 1024;
 229 #ifdef GSSEAP_DEBUG
 230     wpa_debug_level = 0;
 231 #endif
 232
 233     assert(cred->name != GSS_C_NO_NAME);
 234
 235     if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
 236         *minor = GSSEAP_BAD_INITIATOR_NAME;
 237         return GSS_S_BAD_NAME;
 238     }
 239
 240     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 241     if (code != 0) {
 242         *minor = code;
 243         return GSS_S_FAILURE;
 244     }
 245
 246     eapPeerConfig->identity = (unsigned char *)identity;
 247     eapPeerConfig->identity_len = strlen(identity);
 248     eapPeerConfig->password = (unsigned char *)cred->password.value;
 249     eapPeerConfig->password_len = cred->password.length;
 250
 251     *minor = 0;
 252     return GSS_S_COMPLETE;
 253 }
 254
 255 static OM_uint32
 256 peerConfigFree(OM_uint32 *minor,
 257                gss_ctx_id_t ctx)
 258 {
 259     krb5_context krbContext;
 260     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 261
 262     GSSEAP_KRB_INIT(&krbContext);
 263
 264     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 265
 266     *minor = 0;
 267     return GSS_S_COMPLETE;
 268 }
 269
 270 /*
 271  * Mark an initiator context as ready for cryptographic operations
 272  */
 273 static OM_uint32
 274 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 275 {
 276     OM_uint32 major;
 277     const unsigned char *key;
 278     size_t keyLength;
 279
 280 #if 1
 281     /* XXX actually check for mutual auth */
 282     if (reqFlags & GSS_C_MUTUAL_FLAG)
 283         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 284 #endif
 285
 286     /* Cache encryption type derived from selected mechanism OID */
 287     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 288     if (GSS_ERROR(major))
 289         return major;
 290
 291     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 292         *minor = GSSEAP_KEY_UNAVAILABLE;
 293         return GSS_S_UNAVAILABLE;
 294     }
 295
 296     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 297
 298     if (keyLength < EAP_EMSK_LEN) {
 299         *minor = GSSEAP_KEY_TOO_SHORT;
 300         return GSS_S_UNAVAILABLE;
 301     }
 302
 303     major = gssEapDeriveRfc3961Key(minor,
 304                                    &key[EAP_EMSK_LEN / 2],
 305                                    EAP_EMSK_LEN / 2,
 306                                    ctx->encryptionType,
 307                                    &ctx->rfc3961Key);
 308        if (GSS_ERROR(major))
 309            return major;
 310
 311     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 312                                       &ctx->checksumType);
 313     if (GSS_ERROR(major))
 314         return major;
 315
 316     major = sequenceInit(minor,
 317                          &ctx->seqState,
 318                          ctx->recvSeq,
 319                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 320                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 321                          TRUE);
 322     if (GSS_ERROR(major))
 323         return major;
 324
 325     *minor = 0;
 326     return GSS_S_COMPLETE;
 327 }
 328
 329 static OM_uint32
 330 initBegin(OM_uint32 *minor,
 331           gss_cred_id_t cred,
 332           gss_ctx_id_t ctx,
 333           gss_name_t target,
 334           gss_OID mech,
 335           OM_uint32 reqFlags,
 336           OM_uint32 timeReq,
 337           gss_channel_bindings_t chanBindings,
 338           gss_buffer_t inputToken,
 339           gss_buffer_t outputToken)
 340 {
 341     OM_uint32 major;
 342
 343     assert(cred != GSS_C_NO_CREDENTIAL);
 344
 345     if (cred->expiryTime)
 346         ctx->expiryTime = cred->expiryTime;
 347     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 348         ctx->expiryTime = 0;
 349     else
 350         ctx->expiryTime = time(NULL) + timeReq;
 351
 352     /*
 353      * The credential mutex protects its name, however we need to
 354      * explicitly lock the acceptor name (unlikely as it may be
 355      * that it has attributes set on it).
 356      */
 357     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 358     if (GSS_ERROR(major))
 359         return major;
 360
 361     GSSEAP_MUTEX_LOCK(&target->mutex);
 362
 363     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 364     if (GSS_ERROR(major)) {
 365         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 366         return major;
 367     }
 368
 369     GSSEAP_MUTEX_UNLOCK(&target->mutex);
 370
 371     if (mech == GSS_C_NULL_OID) {
 372         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 373     } else if (gssEapIsConcreteMechanismOid(mech)) {
 374         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 375             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 376     } else {
 377         major = GSS_S_BAD_MECH;
 378         *minor = GSSEAP_WRONG_MECH;
 379     }
 380     if (GSS_ERROR(major))
 381         return major;
 382
 383     /* If credentials were provided, check they're usable with this mech */
 384     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 385         *minor = GSSEAP_CRED_MECH_MISMATCH;
 386         return GSS_S_BAD_MECH;
 387     }
 388
 389     *minor = 0;
 390     return GSS_S_COMPLETE;
 391 }
 392
 393 static OM_uint32
 394 eapGssSmInitIdentity(OM_uint32 *minor,
 395                      gss_cred_id_t cred,
 396                      gss_ctx_id_t ctx,
 397                      gss_name_t target,
 398                      gss_OID mech,
 399                      OM_uint32 reqFlags,
 400                      OM_uint32 timeReq,
 401                      gss_channel_bindings_t chanBindings,
 402                      gss_buffer_t inputToken,
 403                      gss_buffer_t outputToken)
 404 {
 405     OM_uint32 major;
 406     int initialContextToken;
 407
 408     initialContextToken = (inputToken->length == 0);
 409     if (!initialContextToken) {
 410         *minor = GSSEAP_WRONG_SIZE;
 411         return GSS_S_DEFECTIVE_TOKEN;
 412     }
 413
 414     major = initBegin(minor, cred, ctx, target, mech,
 415                       reqFlags, timeReq, chanBindings,
 416                       inputToken, outputToken);
 417     if (GSS_ERROR(major))
 418         return major;
 419
 420     ctx->state = GSSEAP_STATE_AUTHENTICATE;
 421
 422     *minor = 0;
 423     return GSS_S_CONTINUE_NEEDED;
 424 }
 425
 426 static struct wpabuf emptyWpaBuffer;
 427
 428 static OM_uint32
 429 eapGssSmInitAuthenticate(OM_uint32 *minor,
 430                          gss_cred_id_t cred,
 431                          gss_ctx_id_t ctx,
 432                          gss_name_t target,
 433                          gss_OID mech,
 434                          OM_uint32 reqFlags,
 435                          OM_uint32 timeReq,
 436                          gss_channel_bindings_t chanBindings,
 437                          gss_buffer_t inputToken,
 438                          gss_buffer_t outputToken)
 439 {
 440     OM_uint32 major;
 441     OM_uint32 tmpMinor;
 442     int code;
 443     struct wpabuf *resp = NULL;
 444     int initialContextToken;
 445
 446     *minor = 0;
 447
 448     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 449                            inputToken->length == 0);
 450
 451     major = peerConfigInit(minor, cred, ctx);
 452     if (GSS_ERROR(major))
 453         goto cleanup;
 454
 455     if (ctx->initiatorCtx.eap == NULL) {
 456         struct eap_config eapConfig;
 457
 458         memset(&eapConfig, 0, sizeof(eapConfig));
 459
 460         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 461                                                  &gssEapPolicyCallbacks,
 462                                                  ctx,
 463                                                  &eapConfig);
 464         if (ctx->initiatorCtx.eap == NULL) {
 465             major = GSS_S_FAILURE;
 466             *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 467             goto cleanup;
 468         }
 469
 470         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 471     }
 472
 473     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 474
 475     wpabuf_set(&ctx->initiatorCtx.reqData,
 476                inputToken->value, inputToken->length);
 477
 478     major = GSS_S_CONTINUE_NEEDED;
 479
 480     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 481     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 482         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 483
 484         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 485     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 486         major = initReady(minor, ctx, reqFlags);
 487         if (GSS_ERROR(major))
 488             goto cleanup;
 489
 490         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 491         major = GSS_S_CONTINUE_NEEDED;
 492         ctx->state = GSSEAP_STATE_EXTENSIONS_REQ;
 493     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 494         major = GSS_S_DEFECTIVE_CREDENTIAL;
 495         *minor = GSSEAP_PEER_AUTH_FAILURE;
 496     } else if (code == 0 && initialContextToken) {
 497         resp = &emptyWpaBuffer;
 498         major = GSS_S_CONTINUE_NEEDED;
 499     } else {
 500         major = GSS_S_DEFECTIVE_TOKEN;
 501         *minor = GSSEAP_PEER_BAD_MESSAGE;
 502     }
 503
 504 cleanup:
 505     if (resp != NULL) {
 506         OM_uint32 tmpMajor;
 507         gss_buffer_desc respBuf;
 508
 509         assert(major == GSS_S_CONTINUE_NEEDED);
 510
 511         respBuf.length = wpabuf_len(resp);
 512         respBuf.value = (void *)wpabuf_head(resp);
 513
 514         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 515         if (GSS_ERROR(tmpMajor)) {
 516             major = tmpMajor;
 517             *minor = tmpMinor;
 518         }
 519     }
 520
 521     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 522     peerConfigFree(&tmpMinor, ctx);
 523
 524     return major;
 525 }
 526
 527 static OM_uint32
 528 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 529                           gss_cred_id_t cred,
 530                           gss_ctx_id_t ctx,
 531                           gss_name_t target,
 532                           gss_OID mech,
 533                           OM_uint32 reqFlags,
 534                           OM_uint32 timeReq,
 535                           gss_channel_bindings_t chanBindings,
 536                           gss_buffer_t inputToken,
 537                           gss_buffer_t outputToken)
 538 {
 539     OM_uint32 major;
 540
 541     major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
 542     if (GSS_ERROR(major))
 543         return major;
 544
 545     assert(outputToken->value != NULL);
 546
 547     ctx->state = GSSEAP_STATE_EXTENSIONS_RESP;
 548
 549     *minor = 0;
 550     return GSS_S_CONTINUE_NEEDED;
 551 }
 552
 553 static OM_uint32
 554 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 555                            gss_cred_id_t cred,
 556                            gss_ctx_id_t ctx,
 557                            gss_name_t target,
 558                            gss_OID mech,
 559                            OM_uint32 reqFlags,
 560                            OM_uint32 timeReq,
 561                            gss_channel_bindings_t chanBindings,
 562                            gss_buffer_t inputToken,
 563                            gss_buffer_t outputToken)
 564 {
 565     OM_uint32 major;
 566
 567     major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
 568     if (GSS_ERROR(major))
 569         return major;
 570
 571     ctx->state = GSSEAP_STATE_ESTABLISHED;
 572
 573     *minor = 0;
 574     return GSS_S_COMPLETE;
 575 }
 576
 577 static OM_uint32
 578 eapGssSmInitEstablished(OM_uint32 *minor,
 579                         gss_cred_id_t cred,
 580                         gss_ctx_id_t ctx,
 581                         gss_name_t target,
 582                         gss_OID mech,
 583                         OM_uint32 reqFlags,
 584                         OM_uint32 timeReq,
 585                         gss_channel_bindings_t chanBindings,
 586                         gss_buffer_t inputToken,
 587                         gss_buffer_t outputToken)
 588 {
 589     /* Called with already established context */
 590     *minor = GSSEAP_CONTEXT_ESTABLISHED;
 591     return GSS_S_BAD_STATUS;
 592 }
 593
 594 static OM_uint32
 595 eapGssSmInitError(OM_uint32 *minor,
 596                   gss_cred_id_t cred,
 597                   gss_ctx_id_t ctx,
 598                   gss_name_t target,
 599                   gss_OID mech,
 600                   OM_uint32 reqFlags,
 601                   OM_uint32 timeReq,
 602                   gss_channel_bindings_t chanBindings,
 603                   gss_buffer_t inputToken,
 604                   gss_buffer_t outputToken)
 605 {
 606     OM_uint32 major;
 607     unsigned char *p;
 608
 609     if (inputToken->length < 8) {
 610         *minor = GSSEAP_TOK_TRUNC;
 611         return GSS_S_DEFECTIVE_TOKEN;
 612     }
 613
 614     p = (unsigned char *)inputToken->value;
 615
 616     major = load_uint32_be(&p[0]);
 617     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 618
 619     if (!GSS_ERROR(major)) {
 620         major = GSS_S_FAILURE;
 621         *minor = GSSEAP_BAD_ERROR_TOKEN;
 622     }
 623
 624     return major;
 625 }
 626
 627 static struct gss_eap_initiator_sm {
 628     enum gss_eap_token_type inputTokenType;
 629     enum gss_eap_token_type outputTokenType;
 630     OM_uint32 (*processToken)(OM_uint32 *,
 631                               gss_cred_id_t,
 632                               gss_ctx_id_t,
 633                               gss_name_t,
 634                               gss_OID,
 635                               OM_uint32,
 636                               OM_uint32,
 637                               gss_channel_bindings_t,
 638                               gss_buffer_t,
 639                               gss_buffer_t);
 640 } eapGssInitiatorSm[] = {
 641     { TOK_TYPE_NONE,        TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 642     { TOK_TYPE_EAP_REQ,     TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 643     { TOK_TYPE_NONE,        TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 644     { TOK_TYPE_EXT_RESP,    TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 645     { TOK_TYPE_NONE,        TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 646     { TOK_TYPE_CONTEXT_ERR, TOK_TYPE_NONE,          eapGssSmInitError               },
 647 #ifdef GSSEAP_ENABLE_REAUTH
 648     { TOK_TYPE_GSS_REAUTH,  TOK_TYPE_GSS_REAUTH,    eapGssSmInitGssReauth           },
 649 #endif
 650 };
 651
 652 OM_uint32
 653 gss_init_sec_context(OM_uint32 *minor,
 654                      gss_cred_id_t cred,
 655                      gss_ctx_id_t *context_handle,
 656                      gss_name_t target_name,
 657                      gss_OID mech_type,
 658                      OM_uint32 req_flags,
 659                      OM_uint32 time_req,
 660                      gss_channel_bindings_t input_chan_bindings,
 661                      gss_buffer_t input_token,
 662                      gss_OID *actual_mech_type,
 663                      gss_buffer_t output_token,
 664                      OM_uint32 *ret_flags,
 665                      OM_uint32 *time_rec)
 666 {
 667     OM_uint32 major;
 668     OM_uint32 tmpMajor, tmpMinor;
 669     gss_ctx_id_t ctx = *context_handle;
 670     struct gss_eap_initiator_sm *sm = NULL;
 671     gss_buffer_desc innerInputToken;
 672     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 673     enum gss_eap_token_type tokType;
 674     gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
 675     int initialContextToken = 0;
 676
 677     *minor = 0;
 678
 679     output_token->length = 0;
 680     output_token->value = NULL;
 681
 682     if (ctx == GSS_C_NO_CONTEXT) {
 683         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 684             *minor = GSSEAP_WRONG_SIZE;
 685             return GSS_S_DEFECTIVE_TOKEN;
 686         }
 687
 688         major = gssEapAllocContext(minor, &ctx);
 689         if (GSS_ERROR(major))
 690             return major;
 691
 692         ctx->flags |= CTX_FLAG_INITIATOR;
 693
 694         initialContextToken = 1;
 695         *context_handle = ctx;
 696     }
 697
 698     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 699
 700     if (cred == GSS_C_NO_CREDENTIAL) {
 701         if (ctx->initiatorCtx.defaultCred == GSS_C_NO_CREDENTIAL) {
 702             major = gssEapAcquireCred(minor,
 703                                       GSS_C_NO_NAME,
 704                                       GSS_C_NO_BUFFER,
 705                                       time_req,
 706                                       GSS_C_NO_OID_SET,
 707                                       GSS_C_INITIATE,
 708                                       &defaultCred,
 709                                       NULL,
 710                                       NULL);
 711             if (GSS_ERROR(major))
 712                 goto cleanup;
 713         }
 714
 715         cred = ctx->initiatorCtx.defaultCred;
 716     }
 717
 718     GSSEAP_MUTEX_LOCK(&cred->mutex);
 719
 720 #ifdef GSSEAP_ENABLE_REAUTH
 721     if (initialContextToken && gssEapCanReauthP(cred, target_name, time_req))
 722         ctx->state = GSSEAP_STATE_KRB_REAUTH;
 723 #endif
 724
 725     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 726         major = GSS_S_NO_CRED;
 727         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 728         goto cleanup;
 729     }
 730
 731     sm = &eapGssInitiatorSm[ctx->state];
 732
 733     if (input_token != GSS_C_NO_BUFFER) {
 734         major = gssEapVerifyToken(minor, ctx, input_token,
 735                                   &tokType, &innerInputToken);
 736         if (GSS_ERROR(major))
 737             goto cleanup;
 738
 739         if (tokType == TOK_TYPE_CONTEXT_ERR) {
 740             ctx->state = GSSEAP_STATE_ERROR;
 741         } else if (tokType != sm->inputTokenType) {
 742             major = GSS_S_DEFECTIVE_TOKEN;
 743             *minor = GSSEAP_WRONG_TOK_ID;
 744             goto cleanup;
 745         }
 746     } else {
 747         innerInputToken.length = 0;
 748         innerInputToken.value = NULL;
 749     }
 750
 751     /*
 752      * Advance through state machine whilst empty tokens are emitted and
 753      * the status is not GSS_S_COMPLETE or an error status.
 754      */
 755     do {
 756         sm = &eapGssInitiatorSm[ctx->state];
 757
 758         major = (sm->processToken)(minor,
 759                                    cred,
 760                                    ctx,
 761                                    target_name,
 762                                    mech_type,
 763                                    req_flags,
 764                                    time_req,
 765                                    input_chan_bindings,
 766                                    &innerInputToken,
 767                                    &innerOutputToken);
 768         if (GSS_ERROR(major))
 769             goto cleanup;
 770     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 771
 772     if (actual_mech_type != NULL) {
 773         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 774             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 775     }
 776     if (innerOutputToken.value != NULL) {
 777         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 778                                    sm->outputTokenType, output_token);
 779         if (GSS_ERROR(tmpMajor)) {
 780             major = tmpMajor;
 781             *minor = tmpMinor;
 782             goto cleanup;
 783         }
 784     }
 785     if (ret_flags != NULL)
 786         *ret_flags = ctx->gssFlags;
 787     if (time_rec != NULL)
 788         gssEapContextTime(&tmpMinor, ctx, time_rec);
 789
 790     assert(ctx->state == GSSEAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 791
 792 cleanup:
 793     if (cred != GSS_C_NO_CREDENTIAL)
 794         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 795     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 796
 797     if (GSS_ERROR(major))
 798         gssEapReleaseContext(&tmpMinor, context_handle);
 799
 800     gss_release_buffer(&tmpMinor, &innerOutputToken);
 801
 802     return major;
 803 }
 804
 805 #ifdef GSSEAP_ENABLE_REAUTH
 806 static OM_uint32
 807 eapGssSmInitGssReauth(OM_uint32 *minor,
 808                       gss_cred_id_t cred,
 809                       gss_ctx_id_t ctx,
 810                       gss_name_t target,
 811                       gss_OID mech,
 812                       OM_uint32 reqFlags,
 813                       OM_uint32 timeReq,
 814                       gss_channel_bindings_t chanBindings,
 815                       gss_buffer_t inputToken,
 816                       gss_buffer_t outputToken)
 817 {
 818     OM_uint32 major, tmpMinor;
 819     gss_name_t mechTarget = GSS_C_NO_NAME;
 820     gss_OID actualMech = GSS_C_NO_OID;
 821     OM_uint32 gssFlags, timeRec;
 822
 823     assert(cred != GSS_C_NO_CREDENTIAL);
 824
 825     ctx->flags |= CTX_FLAG_KRB_REAUTH;
 826
 827     if (inputToken->length == 0) {
 828         major = initBegin(minor, cred, ctx, target, mech,
 829                           reqFlags, timeReq, chanBindings,
 830                           inputToken, outputToken);
 831         if (GSS_ERROR(major))
 832             goto cleanup;
 833     }
 834
 835     major = gssEapMechToGlueName(minor, target, &mechTarget);
 836     if (GSS_ERROR(major))
 837         goto cleanup;
 838
 839     major = gssInitSecContext(minor,
 840                               cred->krbCred,
 841                               &ctx->kerberosCtx,
 842                               mechTarget,
 843                               (gss_OID)gss_mech_krb5,
 844                               reqFlags, /* | GSS_C_DCE_STYLE, */
 845                               timeReq,
 846                               chanBindings,
 847                               inputToken,
 848                               &actualMech,
 849                               outputToken,
 850                               &gssFlags,
 851                               &timeRec);
 852     if (GSS_ERROR(major))
 853         goto cleanup;
 854
 855     ctx->gssFlags = gssFlags;
 856
 857     if (major == GSS_S_COMPLETE) {
 858         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 859         if (GSS_ERROR(major))
 860             goto cleanup;
 861         ctx->state = GSSEAP_STATE_ESTABLISHED;
 862     }
 863
 864 cleanup:
 865     gssReleaseName(&tmpMinor, &mechTarget);
 866
 867     return major;
 868 }
 869 #endif /* GSSEAP_ENABLE_REAUTH */