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