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