www.project-moonshot.org Git - mech_eap.orig/blob - init_sec_context.c

   1 /*
   2  * Copyright (c) 2011, 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 static OM_uint32
  41 policyVariableToFlag(enum eapol_bool_var variable)
  42 {
  43     OM_uint32 flag = 0;
  44
  45     switch (variable) {
  46     case EAPOL_eapSuccess:
  47         flag = CTX_FLAG_EAP_SUCCESS;
  48         break;
  49     case EAPOL_eapRestart:
  50         flag = CTX_FLAG_EAP_RESTART;
  51         break;
  52     case EAPOL_eapFail:
  53         flag = CTX_FLAG_EAP_FAIL;
  54         break;
  55     case EAPOL_eapResp:
  56         flag = CTX_FLAG_EAP_RESP;
  57         break;
  58     case EAPOL_eapNoResp:
  59         flag = CTX_FLAG_EAP_NO_RESP;
  60         break;
  61     case EAPOL_eapReq:
  62         flag = CTX_FLAG_EAP_REQ;
  63         break;
  64     case EAPOL_portEnabled:
  65         flag = CTX_FLAG_EAP_PORT_ENABLED;
  66         break;
  67     case EAPOL_altAccept:
  68         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  69         break;
  70     case EAPOL_altReject:
  71         flag = CTX_FLAG_EAP_ALT_REJECT;
  72         break;
  73     }
  74
  75     return flag;
  76 }
  77
  78 static struct eap_peer_config *
  79 peerGetConfig(void *ctx)
  80 {
  81     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  82
  83     return &gssCtx->initiatorCtx.eapPeerConfig;
  84 }
  85
  86 static Boolean
  87 peerGetBool(void *data, enum eapol_bool_var variable)
  88 {
  89     gss_ctx_id_t ctx = data;
  90     OM_uint32 flag;
  91
  92     if (ctx == GSS_C_NO_CONTEXT)
  93         return FALSE;
  94
  95     flag = policyVariableToFlag(variable);
  96
  97     return ((ctx->flags & flag) != 0);
  98 }
  99
 100 static void
 101 peerSetBool(void *data, enum eapol_bool_var variable,
 102             Boolean value)
 103 {
 104     gss_ctx_id_t ctx = data;
 105     OM_uint32 flag;
 106
 107     if (ctx == GSS_C_NO_CONTEXT)
 108         return;
 109
 110     flag = policyVariableToFlag(variable);
 111
 112     if (value)
 113         ctx->flags |= flag;
 114     else
 115         ctx->flags &= ~(flag);
 116 }
 117
 118 static unsigned int
 119 peerGetInt(void *data, enum eapol_int_var variable)
 120 {
 121     gss_ctx_id_t ctx = data;
 122
 123     if (ctx == GSS_C_NO_CONTEXT)
 124         return FALSE;
 125
 126     assert(CTX_IS_INITIATOR(ctx));
 127
 128     switch (variable) {
 129     case EAPOL_idleWhile:
 130         return ctx->initiatorCtx.idleWhile;
 131         break;
 132     }
 133
 134     return 0;
 135 }
 136
 137 static void
 138 peerSetInt(void *data, enum eapol_int_var variable,
 139            unsigned int value)
 140 {
 141     gss_ctx_id_t ctx = data;
 142
 143     if (ctx == GSS_C_NO_CONTEXT)
 144         return;
 145
 146     assert(CTX_IS_INITIATOR(ctx));
 147
 148     switch (variable) {
 149     case EAPOL_idleWhile:
 150         ctx->initiatorCtx.idleWhile = value;
 151         break;
 152     }
 153 }
 154
 155 static struct wpabuf *
 156 peerGetEapReqData(void *ctx)
 157 {
 158     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 159
 160     return &gssCtx->initiatorCtx.reqData;
 161 }
 162
 163 static void
 164 peerSetConfigBlob(void *ctx GSSEAP_UNUSED,
 165                   struct wpa_config_blob *blob GSSEAP_UNUSED)
 166 {
 167 }
 168
 169 static const struct wpa_config_blob *
 170 peerGetConfigBlob(void *ctx GSSEAP_UNUSED,
 171                   const char *name GSSEAP_UNUSED)
 172 {
 173     return NULL;
 174 }
 175
 176 static void
 177 peerNotifyPending(void *ctx GSSEAP_UNUSED)
 178 {
 179 }
 180
 181 static struct eapol_callbacks gssEapPolicyCallbacks = {
 182     peerGetConfig,
 183     peerGetBool,
 184     peerSetBool,
 185     peerGetInt,
 186     peerSetInt,
 187     peerGetEapReqData,
 188     peerSetConfigBlob,
 189     peerGetConfigBlob,
 190     peerNotifyPending,
 191 };
 192
 193 #ifdef GSSEAP_DEBUG
 194 extern int wpa_debug_level;
 195 #endif
 196
 197 static OM_uint32
 198 peerConfigInit(OM_uint32 *minor,
 199                gss_cred_id_t cred,
 200                gss_ctx_id_t ctx)
 201 {
 202     OM_uint32 major;
 203     krb5_context krbContext;
 204     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 205     gss_buffer_desc identity = GSS_C_EMPTY_BUFFER;
 206     gss_buffer_desc anonymousIdentity = GSS_C_EMPTY_BUFFER;
 207     ssize_t i;
 208
 209     eapPeerConfig->identity = NULL;
 210     eapPeerConfig->identity_len = 0;
 211     eapPeerConfig->anonymous_identity = NULL;
 212     eapPeerConfig->anonymous_identity_len = 0;
 213     eapPeerConfig->password = NULL;
 214     eapPeerConfig->password_len = 0;
 215
 216     assert(cred != GSS_C_NO_CREDENTIAL);
 217
 218     GSSEAP_KRB_INIT(&krbContext);
 219
 220     eapPeerConfig->fragment_size = 1024;
 221 #ifdef GSSEAP_DEBUG
 222     wpa_debug_level = 0;
 223 #endif
 224
 225     assert(cred->name != GSS_C_NO_NAME);
 226
 227     /*
 228      * draft-ietf-abfab-gss-eap-01: the host portion is empty
 229      * for initiators.
 230      */
 231     if ((cred->name->flags & NAME_FLAG_NAI) == 0) {
 232         *minor = GSSEAP_BAD_INITIATOR_NAME;
 233         return GSS_S_BAD_NAME;
 234     }
 235
 236     major = gssEapDisplayName(minor, cred->name, &identity, NULL);
 237     if (GSS_ERROR(major))
 238         return major;
 239
 240     assert(identity.length > 0);
 241
 242     for (i = identity.length - 1; i >= 0; i--) {
 243         unsigned char *p = (unsigned char *)identity.value + i;
 244
 245         if (*p == '@') {
 246             anonymousIdentity.length = identity.length - i;
 247             anonymousIdentity.value = p;
 248             break;
 249         }
 250     }
 251
 252     if (anonymousIdentity.length == 0)
 253         anonymousIdentity.value = "";
 254
 255     eapPeerConfig->identity = (unsigned char *)identity.value;
 256     eapPeerConfig->identity_len = identity.length;
 257     eapPeerConfig->anonymous_identity = (unsigned char *)anonymousIdentity.value;
 258     eapPeerConfig->anonymous_identity_len = anonymousIdentity.length;
 259     eapPeerConfig->password = (unsigned char *)cred->password.value;
 260     eapPeerConfig->password_len = cred->password.length;
 261
 262     *minor = 0;
 263     return GSS_S_COMPLETE;
 264 }
 265
 266 static OM_uint32
 267 peerConfigFree(OM_uint32 *minor,
 268                gss_ctx_id_t ctx)
 269 {
 270     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 271
 272     GSSEAP_FREE(eapPeerConfig->identity);
 273
 274     *minor = 0;
 275     return GSS_S_COMPLETE;
 276 }
 277
 278 /*
 279  * Mark an initiator context as ready for cryptographic operations
 280  */
 281 static OM_uint32
 282 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 283 {
 284     OM_uint32 major;
 285     const unsigned char *key;
 286     size_t keyLength;
 287
 288 #if 1
 289     /* XXX actually check for mutual auth */
 290     if (reqFlags & GSS_C_MUTUAL_FLAG)
 291         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 292 #endif
 293
 294     /* Cache encryption type derived from selected mechanism OID */
 295     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 296     if (GSS_ERROR(major))
 297         return major;
 298
 299     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 300         *minor = GSSEAP_KEY_UNAVAILABLE;
 301         return GSS_S_UNAVAILABLE;
 302     }
 303
 304     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 305
 306     if (keyLength < EAP_EMSK_LEN) {
 307         *minor = GSSEAP_KEY_TOO_SHORT;
 308         return GSS_S_UNAVAILABLE;
 309     }
 310
 311     major = gssEapDeriveRfc3961Key(minor,
 312                                    &key[EAP_EMSK_LEN / 2],
 313                                    EAP_EMSK_LEN / 2,
 314                                    ctx->encryptionType,
 315                                    &ctx->rfc3961Key);
 316        if (GSS_ERROR(major))
 317            return major;
 318
 319     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 320                                       &ctx->checksumType);
 321     if (GSS_ERROR(major))
 322         return major;
 323
 324     major = sequenceInit(minor,
 325                          &ctx->seqState,
 326                          ctx->recvSeq,
 327                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 328                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 329                          TRUE);
 330     if (GSS_ERROR(major))
 331         return major;
 332
 333     *minor = 0;
 334     return GSS_S_COMPLETE;
 335 }
 336
 337 static OM_uint32
 338 initBegin(OM_uint32 *minor,
 339           gss_cred_id_t cred,
 340           gss_ctx_id_t ctx,
 341           gss_name_t target,
 342           gss_OID mech,
 343           OM_uint32 reqFlags GSSEAP_UNUSED,
 344           OM_uint32 timeReq,
 345           gss_channel_bindings_t chanBindings GSSEAP_UNUSED)
 346 {
 347     OM_uint32 major;
 348
 349     assert(cred != GSS_C_NO_CREDENTIAL);
 350
 351     if (cred->expiryTime)
 352         ctx->expiryTime = cred->expiryTime;
 353     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 354         ctx->expiryTime = 0;
 355     else
 356         ctx->expiryTime = time(NULL) + timeReq;
 357
 358     /*
 359      * The credential mutex protects its name, however we need to
 360      * explicitly lock the acceptor name (unlikely as it may be
 361      * that it has attributes set on it).
 362      */
 363     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 364     if (GSS_ERROR(major))
 365         return major;
 366
 367     if (target != GSS_C_NO_NAME) {
 368         GSSEAP_MUTEX_LOCK(&target->mutex);
 369
 370         major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 371         if (GSS_ERROR(major)) {
 372             GSSEAP_MUTEX_UNLOCK(&target->mutex);
 373             return major;
 374         }
 375
 376         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 377     }
 378
 379     major = gssEapCanonicalizeOid(minor,
 380                                   mech,
 381                                   OID_FLAG_NULL_VALID | OID_FLAG_MAP_NULL_TO_DEFAULT_MECH,
 382                                   &ctx->mechanismUsed);
 383     if (GSS_ERROR(major))
 384         return major;
 385
 386     /* If credentials were provided, check they're usable with this mech */
 387     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 388         *minor = GSSEAP_CRED_MECH_MISMATCH;
 389         return GSS_S_BAD_MECH;
 390     }
 391
 392     *minor = 0;
 393     return GSS_S_COMPLETE;
 394 }
 395
 396 static OM_uint32
 397 eapGssSmInitError(OM_uint32 *minor,
 398                   gss_cred_id_t cred GSSEAP_UNUSED,
 399                   gss_ctx_id_t ctx GSSEAP_UNUSED,
 400                   gss_name_t target GSSEAP_UNUSED,
 401                   gss_OID mech GSSEAP_UNUSED,
 402                   OM_uint32 reqFlags GSSEAP_UNUSED,
 403                   OM_uint32 timeReq GSSEAP_UNUSED,
 404                   gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 405                   gss_buffer_t inputToken,
 406                   gss_buffer_t outputToken GSSEAP_UNUSED,
 407                   OM_uint32 *smFlags GSSEAP_UNUSED)
 408 {
 409     OM_uint32 major;
 410     unsigned char *p;
 411
 412     if (inputToken->length < 8) {
 413         *minor = GSSEAP_TOK_TRUNC;
 414         return GSS_S_DEFECTIVE_TOKEN;
 415     }
 416
 417     p = (unsigned char *)inputToken->value;
 418
 419     major = load_uint32_be(&p[0]);
 420     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 421
 422     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 423         major = GSS_S_FAILURE;
 424         *minor = GSSEAP_BAD_ERROR_TOKEN;
 425     }
 426
 427     assert(GSS_ERROR(major));
 428
 429     return major;
 430 }
 431
 432 #ifdef GSSEAP_ENABLE_REAUTH
 433 static OM_uint32
 434 eapGssSmInitGssReauth(OM_uint32 *minor,
 435                       gss_cred_id_t cred,
 436                       gss_ctx_id_t ctx,
 437                       gss_name_t target,
 438                       gss_OID mech GSSEAP_UNUSED,
 439                       OM_uint32 reqFlags,
 440                       OM_uint32 timeReq,
 441                       gss_channel_bindings_t userChanBindings,
 442                       gss_buffer_t inputToken,
 443                       gss_buffer_t outputToken,
 444                       OM_uint32 *smFlags)
 445 {
 446     OM_uint32 major, tmpMinor;
 447     gss_name_t mechTarget = GSS_C_NO_NAME;
 448     gss_OID actualMech = GSS_C_NO_OID;
 449     OM_uint32 gssFlags, timeRec;
 450     struct gss_channel_bindings_struct wireChanBindings = { 0 };
 451
 452     assert(cred != GSS_C_NO_CREDENTIAL);
 453
 454     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 455         if (!gssEapCanReauthP(cred, target, timeReq)) {
 456             major = GSS_S_CONTINUE_NEEDED;
 457             goto cleanup;
 458         }
 459
 460         major = gssEapMakeTokenChannelBindings(minor, ctx,
 461                                                userChanBindings,
 462                                                GSS_C_NO_BUFFER,
 463                                                &wireChanBindings);
 464         if (GSS_ERROR(major))
 465             goto cleanup;
 466
 467         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 468     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 469         major = GSS_S_DEFECTIVE_TOKEN;
 470         *minor = GSSEAP_WRONG_ITOK;
 471         goto cleanup;
 472     }
 473
 474     major = gssEapMechToGlueName(minor, target, &mechTarget);
 475     if (GSS_ERROR(major))
 476         goto cleanup;
 477
 478     major = gssInitSecContext(minor,
 479                               cred->krbCred,
 480                               &ctx->kerberosCtx,
 481                               mechTarget,
 482                               (gss_OID)gss_mech_krb5,
 483                               reqFlags | GSS_C_MUTUAL_FLAG,
 484                               timeReq,
 485                               &wireChanBindings,
 486                               inputToken,
 487                               &actualMech,
 488                               outputToken,
 489                               &gssFlags,
 490                               &timeRec);
 491     if (GSS_ERROR(major))
 492         goto cleanup;
 493
 494     ctx->gssFlags = gssFlags;
 495
 496     if (major == GSS_S_COMPLETE) {
 497         assert(GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE);
 498
 499         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 500         if (GSS_ERROR(major))
 501             goto cleanup;
 502
 503         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ACCEPTOR_EXTS);
 504     } else {
 505         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 506         *smFlags |= SM_FLAG_SEND_TOKEN;
 507     }
 508
 509     major = GSS_S_CONTINUE_NEEDED;
 510
 511 cleanup:
 512     gssReleaseName(&tmpMinor, &mechTarget);
 513     gss_release_buffer(&tmpMinor, &wireChanBindings.application_data);
 514
 515     return major;
 516 }
 517 #endif /* GSSEAP_ENABLE_REAUTH */
 518
 519 #ifdef GSSEAP_DEBUG
 520 static OM_uint32
 521 eapGssSmInitVendorInfo(OM_uint32 *minor,
 522                        gss_cred_id_t cred GSSEAP_UNUSED,
 523                        gss_ctx_id_t ctx GSSEAP_UNUSED,
 524                        gss_name_t target GSSEAP_UNUSED,
 525                        gss_OID mech GSSEAP_UNUSED,
 526                        OM_uint32 reqFlags GSSEAP_UNUSED,
 527                        OM_uint32 timeReq GSSEAP_UNUSED,
 528                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 529                        gss_buffer_t inputToken GSSEAP_UNUSED,
 530                        gss_buffer_t outputToken,
 531                        OM_uint32 *smFlags GSSEAP_UNUSED)
 532 {
 533     OM_uint32 major;
 534
 535     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 536     if (GSS_ERROR(major))
 537         return major;
 538
 539     return GSS_S_CONTINUE_NEEDED;
 540 }
 541 #endif
 542
 543 static OM_uint32
 544 eapGssSmInitAcceptorName(OM_uint32 *minor,
 545                          gss_cred_id_t cred GSSEAP_UNUSED,
 546                          gss_ctx_id_t ctx,
 547                          gss_name_t target GSSEAP_UNUSED,
 548                          gss_OID mech GSSEAP_UNUSED,
 549                          OM_uint32 reqFlags GSSEAP_UNUSED,
 550                          OM_uint32 timeReq GSSEAP_UNUSED,
 551                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 552                          gss_buffer_t inputToken GSSEAP_UNUSED,
 553                          gss_buffer_t outputToken,
 554                          OM_uint32 *smFlags GSSEAP_UNUSED)
 555 {
 556     OM_uint32 major;
 557
 558     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 559         ctx->acceptorName != GSS_C_NO_NAME) {
 560
 561         /* Send desired target name to acceptor */
 562         major = gssEapDisplayName(minor, ctx->acceptorName,
 563                                   outputToken, NULL);
 564         if (GSS_ERROR(major))
 565             return major;
 566     } else if (inputToken != GSS_C_NO_BUFFER &&
 567                ctx->acceptorName == GSS_C_NO_NAME) {
 568         /* Accept target name hint from acceptor */
 569         major = gssEapImportName(minor, inputToken,
 570                                  GSS_C_NT_USER_NAME,
 571                                  ctx->mechanismUsed,
 572                                  &ctx->acceptorName);
 573         if (GSS_ERROR(major))
 574             return major;
 575     }
 576
 577     /*
 578      * Currently, other parts of the code assume that the acceptor name
 579      * is available, hence this check.
 580      */
 581     if (ctx->acceptorName == GSS_C_NO_NAME) {
 582         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 583         return GSS_S_FAILURE;
 584     }
 585
 586     return GSS_S_CONTINUE_NEEDED;
 587 }
 588
 589 static OM_uint32
 590 gssEapSupportedAcceptorExts[] = {
 591     ITOK_TYPE_REAUTH_CREDS,
 592 };
 593
 594 static struct gss_eap_itok_map
 595 gssEapInitiatorExtsFlagMap[] = {
 596 };
 597
 598 static OM_uint32
 599 eapGssSmInitExts(OM_uint32 *minor,
 600                  gss_cred_id_t cred GSSEAP_UNUSED,
 601                  gss_ctx_id_t ctx GSSEAP_UNUSED,
 602                  gss_name_t target GSSEAP_UNUSED,
 603                  gss_OID mech GSSEAP_UNUSED,
 604                  OM_uint32 reqFlags GSSEAP_UNUSED,
 605                  OM_uint32 timeReq GSSEAP_UNUSED,
 606                  gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 607                  gss_buffer_t inputToken,
 608                  gss_buffer_t outputToken,
 609                  OM_uint32 *smFlags GSSEAP_UNUSED)
 610 {
 611     OM_uint32 major = GSS_S_COMPLETE;
 612
 613     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 614         major = gssEapEncodeSupportedExts(minor,
 615                                           gssEapSupportedAcceptorExts,
 616                                           sizeof(gssEapSupportedAcceptorExts) /
 617                                             sizeof(gssEapSupportedAcceptorExts[0]),
 618                                           outputToken);
 619     } else if (inputToken != GSS_C_NO_BUFFER) {
 620         major = gssEapProcessSupportedExts(minor, inputToken,
 621                                           gssEapInitiatorExtsFlagMap,
 622                                           sizeof(gssEapInitiatorExtsFlagMap) /
 623                                             sizeof(gssEapInitiatorExtsFlagMap[0]),
 624                                           &ctx->flags);
 625     }
 626
 627     if (GSS_ERROR(major))
 628         return major;
 629
 630     return GSS_S_CONTINUE_NEEDED;
 631 }
 632
 633 static OM_uint32
 634 eapGssSmInitIdentity(OM_uint32 *minor,
 635                      gss_cred_id_t cred GSSEAP_UNUSED,
 636                      gss_ctx_id_t ctx,
 637                      gss_name_t target GSSEAP_UNUSED,
 638                      gss_OID mech GSSEAP_UNUSED,
 639                      OM_uint32 reqFlags GSSEAP_UNUSED,
 640                      OM_uint32 timeReq GSSEAP_UNUSED,
 641                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 642                      gss_buffer_t inputToken GSSEAP_UNUSED,
 643                      gss_buffer_t outputToken GSSEAP_UNUSED,
 644                      OM_uint32 *smFlags)
 645 {
 646     struct eap_config eapConfig;
 647
 648 #ifdef GSSEAP_ENABLE_REAUTH
 649     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 650         OM_uint32 tmpMinor;
 651
 652         /* server didn't support reauthentication, sent EAP request */
 653         gssDeleteSecContext(&tmpMinor, &ctx->kerberosCtx, GSS_C_NO_BUFFER);
 654         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 655         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 656     } else
 657 #endif
 658         *smFlags |= SM_FLAG_SEND_TOKEN;
 659
 660     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 661     assert(inputToken == GSS_C_NO_BUFFER);
 662
 663     memset(&eapConfig, 0, sizeof(eapConfig));
 664
 665     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 666                                              &gssEapPolicyCallbacks,
 667                                              ctx,
 668                                              &eapConfig);
 669     if (ctx->initiatorCtx.eap == NULL) {
 670         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 671         return GSS_S_FAILURE;
 672     }
 673
 674     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 675
 676     /* poke EAP state machine */
 677     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 678         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 679         return GSS_S_FAILURE;
 680     }
 681
 682     GSSEAP_SM_TRANSITION_NEXT(ctx);
 683
 684     *minor = 0;
 685
 686     return GSS_S_CONTINUE_NEEDED;
 687 }
 688
 689 static OM_uint32
 690 eapGssSmInitAuthenticate(OM_uint32 *minor,
 691                          gss_cred_id_t cred,
 692                          gss_ctx_id_t ctx,
 693                          gss_name_t target GSSEAP_UNUSED,
 694                          gss_OID mech GSSEAP_UNUSED,
 695                          OM_uint32 reqFlags GSSEAP_UNUSED,
 696                          OM_uint32 timeReq GSSEAP_UNUSED,
 697                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 698                          gss_buffer_t inputToken GSSEAP_UNUSED,
 699                          gss_buffer_t outputToken,
 700                          OM_uint32 *smFlags)
 701 {
 702     OM_uint32 major;
 703     OM_uint32 tmpMinor;
 704     int code;
 705     struct wpabuf *resp = NULL;
 706
 707     *minor = 0;
 708
 709     assert(inputToken != GSS_C_NO_BUFFER);
 710
 711     major = peerConfigInit(minor, cred, ctx);
 712     if (GSS_ERROR(major))
 713         goto cleanup;
 714
 715     assert(ctx->initiatorCtx.eap != NULL);
 716     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 717
 718     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 719
 720     wpabuf_set(&ctx->initiatorCtx.reqData,
 721                inputToken->value, inputToken->length);
 722
 723     major = GSS_S_CONTINUE_NEEDED;
 724
 725     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 726     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 727         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 728
 729         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 730     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 731         major = initReady(minor, ctx, reqFlags);
 732         if (GSS_ERROR(major))
 733             goto cleanup;
 734
 735         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 736         major = GSS_S_CONTINUE_NEEDED;
 737         GSSEAP_SM_TRANSITION_NEXT(ctx);
 738     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 739         major = GSS_S_DEFECTIVE_CREDENTIAL;
 740         *minor = GSSEAP_PEER_AUTH_FAILURE;
 741     } else {
 742         major = GSS_S_DEFECTIVE_TOKEN;
 743         *minor = GSSEAP_PEER_BAD_MESSAGE;
 744     }
 745
 746 cleanup:
 747     if (resp != NULL) {
 748         OM_uint32 tmpMajor;
 749         gss_buffer_desc respBuf;
 750
 751         assert(major == GSS_S_CONTINUE_NEEDED);
 752
 753         respBuf.length = wpabuf_len(resp);
 754         respBuf.value = (void *)wpabuf_head(resp);
 755
 756         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 757         if (GSS_ERROR(tmpMajor)) {
 758             major = tmpMajor;
 759             *minor = tmpMinor;
 760         }
 761
 762         *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 763     }
 764
 765     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 766     peerConfigFree(&tmpMinor, ctx);
 767
 768     return major;
 769 }
 770
 771 static OM_uint32
 772 eapGssSmInitGssFlags(OM_uint32 *minor,
 773                      gss_cred_id_t cred GSSEAP_UNUSED,
 774                      gss_ctx_id_t ctx,
 775                      gss_name_t target GSSEAP_UNUSED,
 776                      gss_OID mech GSSEAP_UNUSED,
 777                      OM_uint32 reqFlags GSSEAP_UNUSED,
 778                      OM_uint32 timeReq GSSEAP_UNUSED,
 779                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 780                      gss_buffer_t inputToken GSSEAP_UNUSED,
 781                      gss_buffer_t outputToken,
 782                      OM_uint32 *smFlags GSSEAP_UNUSED)
 783 {
 784     unsigned char wireFlags[4];
 785     gss_buffer_desc flagsBuf;
 786
 787     store_uint32_be(ctx->gssFlags & GSSEAP_WIRE_FLAGS_MASK, wireFlags);
 788
 789     flagsBuf.length = sizeof(wireFlags);
 790     flagsBuf.value = wireFlags;
 791
 792     return duplicateBuffer(minor, &flagsBuf, outputToken);
 793 }
 794
 795 static OM_uint32
 796 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 797                                gss_cred_id_t cred GSSEAP_UNUSED,
 798                                gss_ctx_id_t ctx,
 799                                gss_name_t target GSSEAP_UNUSED,
 800                                gss_OID mech GSSEAP_UNUSED,
 801                                OM_uint32 reqFlags GSSEAP_UNUSED,
 802                                OM_uint32 timeReq GSSEAP_UNUSED,
 803                                gss_channel_bindings_t chanBindings,
 804                                gss_buffer_t inputToken GSSEAP_UNUSED,
 805                                gss_buffer_t outputToken,
 806                                OM_uint32 *smFlags GSSEAP_UNUSED)
 807 {
 808     OM_uint32 major;
 809
 810     if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0 &&
 811         chanBindings != GSS_C_NO_CHANNEL_BINDINGS) {
 812         major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 813                            &chanBindings->application_data, NULL, outputToken);
 814         if (GSS_ERROR(major))
 815             return major;
 816     }
 817
 818     *minor = 0;
 819     return GSS_S_CONTINUE_NEEDED;
 820 }
 821
 822 #ifdef GSSEAP_ENABLE_REAUTH
 823 static OM_uint32
 824 eapGssSmInitReauthCreds(OM_uint32 *minor,
 825                         gss_cred_id_t cred,
 826                         gss_ctx_id_t ctx,
 827                         gss_name_t target GSSEAP_UNUSED,
 828                         gss_OID mech GSSEAP_UNUSED,
 829                         OM_uint32 reqFlags GSSEAP_UNUSED,
 830                         OM_uint32 timeReq GSSEAP_UNUSED,
 831                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 832                         gss_buffer_t inputToken,
 833                         gss_buffer_t outputToken GSSEAP_UNUSED,
 834                         OM_uint32 *smFlags GSSEAP_UNUSED)
 835 {
 836     OM_uint32 major;
 837
 838     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
 839         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 840         if (GSS_ERROR(major))
 841             return major;
 842     }
 843
 844     *minor = 0;
 845     return GSS_S_CONTINUE_NEEDED;
 846 }
 847 #endif /* GSSEAP_ENABLE_REAUTH */
 848
 849 static OM_uint32
 850 eapGssSmInitInitiatorMIC(OM_uint32 *minor,
 851                          gss_cred_id_t cred GSSEAP_UNUSED,
 852                          gss_ctx_id_t ctx,
 853                          gss_name_t target GSSEAP_UNUSED,
 854                          gss_OID mech GSSEAP_UNUSED,
 855                          OM_uint32 reqFlags GSSEAP_UNUSED,
 856                          OM_uint32 timeReq GSSEAP_UNUSED,
 857                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 858                          gss_buffer_t inputToken GSSEAP_UNUSED,
 859                          gss_buffer_t outputToken,
 860                          OM_uint32 *smFlags)
 861 {
 862     OM_uint32 major;
 863
 864     major = gssEapGetConversationMIC(minor, ctx, outputToken);
 865     if (GSS_ERROR(major))
 866         return major;
 867
 868     GSSEAP_SM_TRANSITION_NEXT(ctx);
 869
 870     *minor = 0;
 871     *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 872
 873     return GSS_S_CONTINUE_NEEDED;
 874 }
 875
 876 static OM_uint32
 877 eapGssSmInitAcceptorMIC(OM_uint32 *minor,
 878                         gss_cred_id_t cred GSSEAP_UNUSED,
 879                         gss_ctx_id_t ctx,
 880                         gss_name_t target GSSEAP_UNUSED,
 881                         gss_OID mech GSSEAP_UNUSED,
 882                         OM_uint32 reqFlags GSSEAP_UNUSED,
 883                         OM_uint32 timeReq GSSEAP_UNUSED,
 884                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 885                         gss_buffer_t inputToken,
 886                         gss_buffer_t outputToken GSSEAP_UNUSED,
 887                         OM_uint32 *smFlags GSSEAP_UNUSED)
 888 {
 889     OM_uint32 major;
 890
 891     major = gssEapVerifyConversationMIC(minor, ctx, inputToken);
 892     if (GSS_ERROR(major))
 893         return major;
 894
 895     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 896
 897     *minor = 0;
 898
 899     return GSS_S_COMPLETE;
 900 }
 901
 902 /*
 903  * Initiator state machine.
 904  */
 905 static struct gss_eap_sm eapGssInitiatorSm[] = {
 906     {
 907         ITOK_TYPE_CONTEXT_ERR,
 908         ITOK_TYPE_NONE,
 909         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 910         0,
 911         eapGssSmInitError
 912     },
 913     {
 914         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 915         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 916         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 917         0,
 918         eapGssSmInitAcceptorName
 919     },
 920     {
 921         ITOK_TYPE_SUPPORTED_INITIATOR_EXTS,
 922         ITOK_TYPE_SUPPORTED_ACCEPTOR_EXTS,
 923         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 924         0,
 925         eapGssSmInitExts
 926     },
 927 #ifdef GSSEAP_DEBUG
 928     {
 929         ITOK_TYPE_NONE,
 930         ITOK_TYPE_VENDOR_INFO,
 931         GSSEAP_STATE_INITIAL,
 932         0,
 933         eapGssSmInitVendorInfo
 934     },
 935 #endif
 936 #ifdef GSSEAP_ENABLE_REAUTH
 937     {
 938         ITOK_TYPE_REAUTH_RESP,
 939         ITOK_TYPE_REAUTH_REQ,
 940         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 941         0,
 942         eapGssSmInitGssReauth
 943     },
 944 #endif
 945     {
 946         ITOK_TYPE_NONE,
 947         ITOK_TYPE_NONE,
 948 #ifdef GSSEAP_ENABLE_REAUTH
 949         GSSEAP_STATE_REAUTHENTICATE |
 950 #endif
 951         GSSEAP_STATE_INITIAL,
 952         SM_ITOK_FLAG_REQUIRED,
 953         eapGssSmInitIdentity
 954     },
 955     {
 956         ITOK_TYPE_EAP_REQ,
 957         ITOK_TYPE_EAP_RESP,
 958         GSSEAP_STATE_AUTHENTICATE,
 959         SM_ITOK_FLAG_REQUIRED,
 960         eapGssSmInitAuthenticate
 961     },
 962     {
 963         ITOK_TYPE_NONE,
 964         ITOK_TYPE_GSS_FLAGS,
 965         GSSEAP_STATE_INITIATOR_EXTS,
 966         0,
 967         eapGssSmInitGssFlags
 968     },
 969     {
 970         ITOK_TYPE_NONE,
 971         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 972         GSSEAP_STATE_INITIATOR_EXTS,
 973         0,
 974         eapGssSmInitGssChannelBindings
 975     },
 976     {
 977         ITOK_TYPE_NONE,
 978         ITOK_TYPE_INITIATOR_MIC,
 979         GSSEAP_STATE_INITIATOR_EXTS,
 980         0,
 981         eapGssSmInitInitiatorMIC
 982     },
 983 #ifdef GSSEAP_ENABLE_REAUTH
 984     {
 985         ITOK_TYPE_REAUTH_CREDS,
 986         ITOK_TYPE_NONE,
 987         GSSEAP_STATE_ACCEPTOR_EXTS,
 988         0,
 989         eapGssSmInitReauthCreds
 990     },
 991 #endif
 992     /* other extensions go here */
 993     {
 994         ITOK_TYPE_ACCEPTOR_MIC,
 995         ITOK_TYPE_NONE,
 996         GSSEAP_STATE_ACCEPTOR_EXTS,
 997         SM_ITOK_FLAG_REQUIRED,
 998         eapGssSmInitAcceptorMIC
 999     }
1000 };
1001
1002 OM_uint32
1003 gss_init_sec_context(OM_uint32 *minor,
1004                      gss_cred_id_t cred,
1005                      gss_ctx_id_t *context_handle,
1006                      gss_name_t target_name,
1007                      gss_OID mech_type,
1008                      OM_uint32 req_flags,
1009                      OM_uint32 time_req,
1010                      gss_channel_bindings_t input_chan_bindings,
1011                      gss_buffer_t input_token,
1012                      gss_OID *actual_mech_type,
1013                      gss_buffer_t output_token,
1014                      OM_uint32 *ret_flags,
1015                      OM_uint32 *time_rec)
1016 {
1017     OM_uint32 major, tmpMinor;
1018     gss_ctx_id_t ctx = *context_handle;
1019     int initialContextToken = 0;
1020
1021     *minor = 0;
1022
1023     output_token->length = 0;
1024     output_token->value = NULL;
1025
1026     if (ctx == GSS_C_NO_CONTEXT) {
1027         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
1028             *minor = GSSEAP_WRONG_SIZE;
1029             return GSS_S_DEFECTIVE_TOKEN;
1030         }
1031
1032         major = gssEapAllocContext(minor, &ctx);
1033         if (GSS_ERROR(major))
1034             return major;
1035
1036         ctx->flags |= CTX_FLAG_INITIATOR;
1037         initialContextToken = 1;
1038
1039         *context_handle = ctx;
1040     }
1041
1042     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1043
1044     if (cred == GSS_C_NO_CREDENTIAL) {
1045         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
1046             major = gssEapAcquireCred(minor,
1047                                       GSS_C_NO_NAME,
1048                                       GSS_C_NO_BUFFER,
1049                                       time_req,
1050                                       GSS_C_NO_OID_SET,
1051                                       GSS_C_INITIATE,
1052                                       &ctx->defaultCred,
1053                                       NULL,
1054                                       NULL);
1055             if (GSS_ERROR(major))
1056                 goto cleanup;
1057         }
1058
1059         cred = ctx->defaultCred;
1060     }
1061
1062     GSSEAP_MUTEX_LOCK(&cred->mutex);
1063
1064     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
1065         major = GSS_S_NO_CRED;
1066         *minor = GSSEAP_CRED_USAGE_MISMATCH;
1067         goto cleanup;
1068     }
1069
1070     if (initialContextToken) {
1071         major = initBegin(minor, cred, ctx, target_name, mech_type,
1072                           req_flags, time_req, input_chan_bindings);
1073         if (GSS_ERROR(major))
1074             goto cleanup;
1075     }
1076
1077     major = gssEapSmStep(minor,
1078                          cred,
1079                          ctx,
1080                          target_name,
1081                          mech_type,
1082                          req_flags,
1083                          time_req,
1084                          input_chan_bindings,
1085                          input_token,
1086                          output_token,
1087                          eapGssInitiatorSm,
1088                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
1089     if (GSS_ERROR(major))
1090         goto cleanup;
1091
1092     if (actual_mech_type != NULL) {
1093         OM_uint32 tmpMajor;
1094
1095         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, actual_mech_type);
1096         if (GSS_ERROR(tmpMajor)) {
1097             major = tmpMajor;
1098             *minor = tmpMinor;
1099             goto cleanup;
1100         }
1101     }
1102     if (ret_flags != NULL)
1103         *ret_flags = ctx->gssFlags;
1104     if (time_rec != NULL)
1105         gssEapContextTime(&tmpMinor, ctx, time_rec);
1106
1107     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1108
1109 cleanup:
1110     if (cred != GSS_C_NO_CREDENTIAL)
1111         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1112     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1113
1114     if (GSS_ERROR(major))
1115         gssEapReleaseContext(&tmpMinor, context_handle);
1116
1117     return major;
1118 }