moonshot/mech_eap/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 realm = GSS_C_EMPTY_BUFFER;
 207
 208     eapPeerConfig->identity = NULL;
 209     eapPeerConfig->identity_len = 0;
 210     eapPeerConfig->anonymous_identity = NULL;
 211     eapPeerConfig->anonymous_identity_len = 0;
 212     eapPeerConfig->password = NULL;
 213     eapPeerConfig->password_len = 0;
 214
 215     assert(cred != GSS_C_NO_CREDENTIAL);
 216
 217     GSSEAP_KRB_INIT(&krbContext);
 218
 219     eapPeerConfig->fragment_size = 1024;
 220 #ifdef GSSEAP_DEBUG
 221     wpa_debug_level = 0;
 222 #endif
 223
 224     assert(cred->name != GSS_C_NO_NAME);
 225
 226     /*
 227      * draft-ietf-abfab-gss-eap-01: the host portion is empty
 228      * for initiators.
 229      */
 230     if ((cred->name->flags & NAME_FLAG_NAI) == 0) {
 231         *minor = GSSEAP_BAD_INITIATOR_NAME;
 232         return GSS_S_BAD_NAME;
 233     }
 234
 235     /* identity */
 236     major = gssEapDisplayName(minor, cred->name, &identity, NULL);
 237     if (GSS_ERROR(major))
 238         return major;
 239
 240     eapPeerConfig->identity = (unsigned char *)identity.value;
 241     eapPeerConfig->identity_len = identity.length;
 242
 243     krbPrincRealmToGssBuffer(cred->name->krbPrincipal, &realm);
 244
 245     /* anonymous_identity */
 246     eapPeerConfig->anonymous_identity = GSSEAP_MALLOC(realm.length + 2);
 247     if (eapPeerConfig->anonymous_identity == NULL) {
 248         *minor = ENOMEM;
 249         return GSS_S_FAILURE;
 250     }
 251
 252     eapPeerConfig->anonymous_identity[0] = '@';
 253     memcpy(eapPeerConfig->anonymous_identity + 1, realm.value, realm.length);
 254     eapPeerConfig->anonymous_identity[1 + realm.length] = '\0';
 255     eapPeerConfig->anonymous_identity_len = 1 + realm.length;
 256
 257     /* password */
 258     eapPeerConfig->password = (unsigned char *)cred->password.value;
 259     eapPeerConfig->password_len = cred->password.length;
 260
 261     *minor = 0;
 262     return GSS_S_COMPLETE;
 263 }
 264
 265 static OM_uint32
 266 peerConfigFree(OM_uint32 *minor,
 267                gss_ctx_id_t ctx)
 268 {
 269     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 270
 271     if (eapPeerConfig->identity != NULL) {
 272         GSSEAP_FREE(eapPeerConfig->identity);
 273         eapPeerConfig->identity = NULL;
 274         eapPeerConfig->identity_len = 0;
 275     }
 276
 277     if (eapPeerConfig->anonymous_identity != NULL) {
 278         GSSEAP_FREE(eapPeerConfig->anonymous_identity);
 279         eapPeerConfig->anonymous_identity = NULL;
 280         eapPeerConfig->anonymous_identity_len = 0;
 281     }
 282
 283     *minor = 0;
 284     return GSS_S_COMPLETE;
 285 }
 286
 287 /*
 288  * Mark an initiator context as ready for cryptographic operations
 289  */
 290 static OM_uint32
 291 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 292 {
 293     OM_uint32 major;
 294     const unsigned char *key;
 295     size_t keyLength;
 296
 297 #if 1
 298     /* XXX actually check for mutual auth */
 299     if (reqFlags & GSS_C_MUTUAL_FLAG)
 300         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 301 #endif
 302
 303     /* Cache encryption type derived from selected mechanism OID */
 304     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 305     if (GSS_ERROR(major))
 306         return major;
 307
 308     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 309         *minor = GSSEAP_KEY_UNAVAILABLE;
 310         return GSS_S_UNAVAILABLE;
 311     }
 312
 313     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 314
 315     if (keyLength < EAP_EMSK_LEN) {
 316         *minor = GSSEAP_KEY_TOO_SHORT;
 317         return GSS_S_UNAVAILABLE;
 318     }
 319
 320     major = gssEapDeriveRfc3961Key(minor,
 321                                    &key[EAP_EMSK_LEN / 2],
 322                                    EAP_EMSK_LEN / 2,
 323                                    ctx->encryptionType,
 324                                    &ctx->rfc3961Key);
 325        if (GSS_ERROR(major))
 326            return major;
 327
 328     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 329                                       &ctx->checksumType);
 330     if (GSS_ERROR(major))
 331         return major;
 332
 333     major = sequenceInit(minor,
 334                          &ctx->seqState,
 335                          ctx->recvSeq,
 336                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 337                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 338                          TRUE);
 339     if (GSS_ERROR(major))
 340         return major;
 341
 342     *minor = 0;
 343     return GSS_S_COMPLETE;
 344 }
 345
 346 static OM_uint32
 347 initBegin(OM_uint32 *minor,
 348           gss_cred_id_t cred,
 349           gss_ctx_id_t ctx,
 350           gss_name_t target,
 351           gss_OID mech,
 352           OM_uint32 reqFlags GSSEAP_UNUSED,
 353           OM_uint32 timeReq,
 354           gss_channel_bindings_t chanBindings GSSEAP_UNUSED)
 355 {
 356     OM_uint32 major;
 357
 358     assert(cred != GSS_C_NO_CREDENTIAL);
 359
 360     if (cred->expiryTime)
 361         ctx->expiryTime = cred->expiryTime;
 362     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 363         ctx->expiryTime = 0;
 364     else
 365         ctx->expiryTime = time(NULL) + timeReq;
 366
 367     /*
 368      * The credential mutex protects its name, however we need to
 369      * explicitly lock the acceptor name (unlikely as it may be
 370      * that it has attributes set on it).
 371      */
 372     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 373     if (GSS_ERROR(major))
 374         return major;
 375
 376     if (target != GSS_C_NO_NAME) {
 377         GSSEAP_MUTEX_LOCK(&target->mutex);
 378
 379         major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 380         if (GSS_ERROR(major)) {
 381             GSSEAP_MUTEX_UNLOCK(&target->mutex);
 382             return major;
 383         }
 384
 385         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 386     }
 387
 388     major = gssEapCanonicalizeOid(minor,
 389                                   mech,
 390                                   OID_FLAG_NULL_VALID | OID_FLAG_MAP_NULL_TO_DEFAULT_MECH,
 391                                   &ctx->mechanismUsed);
 392     if (GSS_ERROR(major))
 393         return major;
 394
 395     /* If credentials were provided, check they're usable with this mech */
 396     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 397         *minor = GSSEAP_CRED_MECH_MISMATCH;
 398         return GSS_S_BAD_MECH;
 399     }
 400
 401     *minor = 0;
 402     return GSS_S_COMPLETE;
 403 }
 404
 405 static OM_uint32
 406 eapGssSmInitError(OM_uint32 *minor,
 407                   gss_cred_id_t cred GSSEAP_UNUSED,
 408                   gss_ctx_id_t ctx GSSEAP_UNUSED,
 409                   gss_name_t target GSSEAP_UNUSED,
 410                   gss_OID mech GSSEAP_UNUSED,
 411                   OM_uint32 reqFlags GSSEAP_UNUSED,
 412                   OM_uint32 timeReq GSSEAP_UNUSED,
 413                   gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 414                   gss_buffer_t inputToken,
 415                   gss_buffer_t outputToken GSSEAP_UNUSED,
 416                   OM_uint32 *smFlags GSSEAP_UNUSED)
 417 {
 418     OM_uint32 major;
 419     unsigned char *p;
 420
 421     if (inputToken->length < 8) {
 422         *minor = GSSEAP_TOK_TRUNC;
 423         return GSS_S_DEFECTIVE_TOKEN;
 424     }
 425
 426     p = (unsigned char *)inputToken->value;
 427
 428     major = load_uint32_be(&p[0]);
 429     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 430
 431     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 432         major = GSS_S_FAILURE;
 433         *minor = GSSEAP_BAD_ERROR_TOKEN;
 434     }
 435
 436     assert(GSS_ERROR(major));
 437
 438     return major;
 439 }
 440
 441 #ifdef GSSEAP_ENABLE_REAUTH
 442 static OM_uint32
 443 eapGssSmInitGssReauth(OM_uint32 *minor,
 444                       gss_cred_id_t cred,
 445                       gss_ctx_id_t ctx,
 446                       gss_name_t target,
 447                       gss_OID mech GSSEAP_UNUSED,
 448                       OM_uint32 reqFlags,
 449                       OM_uint32 timeReq,
 450                       gss_channel_bindings_t userChanBindings,
 451                       gss_buffer_t inputToken,
 452                       gss_buffer_t outputToken,
 453                       OM_uint32 *smFlags)
 454 {
 455     OM_uint32 major, tmpMinor;
 456     gss_name_t mechTarget = GSS_C_NO_NAME;
 457     gss_OID actualMech = GSS_C_NO_OID;
 458     OM_uint32 gssFlags, timeRec;
 459     struct gss_channel_bindings_struct wireChanBindings = { 0 };
 460
 461     assert(cred != GSS_C_NO_CREDENTIAL);
 462
 463     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 464         if (!gssEapCanReauthP(cred, target, timeReq)) {
 465             major = GSS_S_CONTINUE_NEEDED;
 466             goto cleanup;
 467         }
 468
 469         major = gssEapMakeTokenChannelBindings(minor, ctx,
 470                                                userChanBindings,
 471                                                GSS_C_NO_BUFFER,
 472                                                &wireChanBindings);
 473         if (GSS_ERROR(major))
 474             goto cleanup;
 475
 476         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 477     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 478         major = GSS_S_DEFECTIVE_TOKEN;
 479         *minor = GSSEAP_WRONG_ITOK;
 480         goto cleanup;
 481     }
 482
 483     major = gssEapMechToGlueName(minor, target, &mechTarget);
 484     if (GSS_ERROR(major))
 485         goto cleanup;
 486
 487     major = gssInitSecContext(minor,
 488                               cred->reauthCred,
 489                               &ctx->reauthCtx,
 490                               mechTarget,
 491                               (gss_OID)gss_mech_krb5,
 492                               reqFlags | GSS_C_MUTUAL_FLAG,
 493                               timeReq,
 494                               &wireChanBindings,
 495                               inputToken,
 496                               &actualMech,
 497                               outputToken,
 498                               &gssFlags,
 499                               &timeRec);
 500     if (GSS_ERROR(major))
 501         goto cleanup;
 502
 503     ctx->gssFlags = gssFlags;
 504
 505     if (major == GSS_S_COMPLETE) {
 506         assert(GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE);
 507
 508         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 509         if (GSS_ERROR(major))
 510             goto cleanup;
 511
 512         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ACCEPTOR_EXTS);
 513     } else {
 514         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 515         *smFlags |= SM_FLAG_SEND_TOKEN;
 516     }
 517
 518     major = GSS_S_CONTINUE_NEEDED;
 519
 520 cleanup:
 521     gssReleaseName(&tmpMinor, &mechTarget);
 522     gss_release_buffer(&tmpMinor, &wireChanBindings.application_data);
 523
 524     return major;
 525 }
 526 #endif /* GSSEAP_ENABLE_REAUTH */
 527
 528 #ifdef GSSEAP_DEBUG
 529 static OM_uint32
 530 eapGssSmInitVendorInfo(OM_uint32 *minor,
 531                        gss_cred_id_t cred GSSEAP_UNUSED,
 532                        gss_ctx_id_t ctx GSSEAP_UNUSED,
 533                        gss_name_t target GSSEAP_UNUSED,
 534                        gss_OID mech GSSEAP_UNUSED,
 535                        OM_uint32 reqFlags GSSEAP_UNUSED,
 536                        OM_uint32 timeReq GSSEAP_UNUSED,
 537                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 538                        gss_buffer_t inputToken GSSEAP_UNUSED,
 539                        gss_buffer_t outputToken,
 540                        OM_uint32 *smFlags GSSEAP_UNUSED)
 541 {
 542     OM_uint32 major;
 543
 544     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 545     if (GSS_ERROR(major))
 546         return major;
 547
 548     return GSS_S_CONTINUE_NEEDED;
 549 }
 550 #endif
 551
 552 static OM_uint32
 553 eapGssSmInitAcceptorName(OM_uint32 *minor,
 554                          gss_cred_id_t cred GSSEAP_UNUSED,
 555                          gss_ctx_id_t ctx,
 556                          gss_name_t target GSSEAP_UNUSED,
 557                          gss_OID mech GSSEAP_UNUSED,
 558                          OM_uint32 reqFlags GSSEAP_UNUSED,
 559                          OM_uint32 timeReq GSSEAP_UNUSED,
 560                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 561                          gss_buffer_t inputToken GSSEAP_UNUSED,
 562                          gss_buffer_t outputToken,
 563                          OM_uint32 *smFlags GSSEAP_UNUSED)
 564 {
 565     OM_uint32 major;
 566
 567     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 568         ctx->acceptorName != GSS_C_NO_NAME) {
 569
 570         /* Send desired target name to acceptor */
 571         major = gssEapDisplayName(minor, ctx->acceptorName,
 572                                   outputToken, NULL);
 573         if (GSS_ERROR(major))
 574             return major;
 575     } else if (inputToken != GSS_C_NO_BUFFER &&
 576                ctx->acceptorName == GSS_C_NO_NAME) {
 577         /* Accept target name hint from acceptor */
 578         major = gssEapImportName(minor, inputToken,
 579                                  GSS_C_NT_USER_NAME,
 580                                  ctx->mechanismUsed,
 581                                  &ctx->acceptorName);
 582         if (GSS_ERROR(major))
 583             return major;
 584     }
 585
 586     /*
 587      * Currently, other parts of the code assume that the acceptor name
 588      * is available, hence this check.
 589      */
 590     if (ctx->acceptorName == GSS_C_NO_NAME) {
 591         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 592         return GSS_S_FAILURE;
 593     }
 594
 595     return GSS_S_CONTINUE_NEEDED;
 596 }
 597
 598 static OM_uint32
 599 gssEapSupportedAcceptorExts[] = {
 600     ITOK_TYPE_REAUTH_CREDS,
 601 };
 602
 603 static struct gss_eap_itok_map
 604 gssEapInitiatorExtsFlagMap[] = {
 605 };
 606
 607 static OM_uint32
 608 eapGssSmInitExts(OM_uint32 *minor,
 609                  gss_cred_id_t cred GSSEAP_UNUSED,
 610                  gss_ctx_id_t ctx GSSEAP_UNUSED,
 611                  gss_name_t target GSSEAP_UNUSED,
 612                  gss_OID mech GSSEAP_UNUSED,
 613                  OM_uint32 reqFlags GSSEAP_UNUSED,
 614                  OM_uint32 timeReq GSSEAP_UNUSED,
 615                  gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 616                  gss_buffer_t inputToken,
 617                  gss_buffer_t outputToken,
 618                  OM_uint32 *smFlags GSSEAP_UNUSED)
 619 {
 620     OM_uint32 major = GSS_S_COMPLETE;
 621
 622     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 623         major = gssEapEncodeSupportedExts(minor,
 624                                           gssEapSupportedAcceptorExts,
 625                                           sizeof(gssEapSupportedAcceptorExts) /
 626                                             sizeof(gssEapSupportedAcceptorExts[0]),
 627                                           outputToken);
 628     } else if (inputToken != GSS_C_NO_BUFFER) {
 629         major = gssEapProcessSupportedExts(minor, inputToken,
 630                                           gssEapInitiatorExtsFlagMap,
 631                                           sizeof(gssEapInitiatorExtsFlagMap) /
 632                                             sizeof(gssEapInitiatorExtsFlagMap[0]),
 633                                           &ctx->flags);
 634     }
 635
 636     if (GSS_ERROR(major))
 637         return major;
 638
 639     return GSS_S_CONTINUE_NEEDED;
 640 }
 641
 642 static OM_uint32
 643 eapGssSmInitIdentity(OM_uint32 *minor,
 644                      gss_cred_id_t cred GSSEAP_UNUSED,
 645                      gss_ctx_id_t ctx,
 646                      gss_name_t target GSSEAP_UNUSED,
 647                      gss_OID mech GSSEAP_UNUSED,
 648                      OM_uint32 reqFlags GSSEAP_UNUSED,
 649                      OM_uint32 timeReq GSSEAP_UNUSED,
 650                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 651                      gss_buffer_t inputToken GSSEAP_UNUSED,
 652                      gss_buffer_t outputToken GSSEAP_UNUSED,
 653                      OM_uint32 *smFlags)
 654 {
 655     struct eap_config eapConfig;
 656
 657 #ifdef GSSEAP_ENABLE_REAUTH
 658     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 659         OM_uint32 tmpMinor;
 660
 661         /* server didn't support reauthentication, sent EAP request */
 662         gssDeleteSecContext(&tmpMinor, &ctx->reauthCtx, GSS_C_NO_BUFFER);
 663         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 664         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 665     } else
 666 #endif
 667         *smFlags |= SM_FLAG_SEND_TOKEN;
 668
 669     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 670     assert(inputToken == GSS_C_NO_BUFFER);
 671
 672     memset(&eapConfig, 0, sizeof(eapConfig));
 673
 674     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 675                                              &gssEapPolicyCallbacks,
 676                                              ctx,
 677                                              &eapConfig);
 678     if (ctx->initiatorCtx.eap == NULL) {
 679         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 680         return GSS_S_FAILURE;
 681     }
 682
 683     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 684
 685     /* poke EAP state machine */
 686     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 687         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 688         return GSS_S_FAILURE;
 689     }
 690
 691     GSSEAP_SM_TRANSITION_NEXT(ctx);
 692
 693     *minor = 0;
 694
 695     return GSS_S_CONTINUE_NEEDED;
 696 }
 697
 698 static OM_uint32
 699 eapGssSmInitAuthenticate(OM_uint32 *minor,
 700                          gss_cred_id_t cred,
 701                          gss_ctx_id_t ctx,
 702                          gss_name_t target GSSEAP_UNUSED,
 703                          gss_OID mech GSSEAP_UNUSED,
 704                          OM_uint32 reqFlags GSSEAP_UNUSED,
 705                          OM_uint32 timeReq GSSEAP_UNUSED,
 706                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 707                          gss_buffer_t inputToken GSSEAP_UNUSED,
 708                          gss_buffer_t outputToken,
 709                          OM_uint32 *smFlags)
 710 {
 711     OM_uint32 major;
 712     OM_uint32 tmpMinor;
 713     int code;
 714     struct wpabuf *resp = NULL;
 715
 716     *minor = 0;
 717
 718     assert(inputToken != GSS_C_NO_BUFFER);
 719
 720     major = peerConfigInit(minor, cred, ctx);
 721     if (GSS_ERROR(major))
 722         goto cleanup;
 723
 724     assert(ctx->initiatorCtx.eap != NULL);
 725     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 726
 727     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 728
 729     wpabuf_set(&ctx->initiatorCtx.reqData,
 730                inputToken->value, inputToken->length);
 731
 732     major = GSS_S_CONTINUE_NEEDED;
 733
 734     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 735     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 736         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 737
 738         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 739     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 740         major = initReady(minor, ctx, reqFlags);
 741         if (GSS_ERROR(major))
 742             goto cleanup;
 743
 744         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 745         major = GSS_S_CONTINUE_NEEDED;
 746         GSSEAP_SM_TRANSITION_NEXT(ctx);
 747     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 748         major = GSS_S_DEFECTIVE_CREDENTIAL;
 749         *minor = GSSEAP_PEER_AUTH_FAILURE;
 750     } else {
 751         major = GSS_S_DEFECTIVE_TOKEN;
 752         *minor = GSSEAP_PEER_BAD_MESSAGE;
 753     }
 754
 755 cleanup:
 756     if (resp != NULL) {
 757         OM_uint32 tmpMajor;
 758         gss_buffer_desc respBuf;
 759
 760         assert(major == GSS_S_CONTINUE_NEEDED);
 761
 762         respBuf.length = wpabuf_len(resp);
 763         respBuf.value = (void *)wpabuf_head(resp);
 764
 765         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 766         if (GSS_ERROR(tmpMajor)) {
 767             major = tmpMajor;
 768             *minor = tmpMinor;
 769         }
 770
 771         *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 772     }
 773
 774     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 775     peerConfigFree(&tmpMinor, ctx);
 776
 777     return major;
 778 }
 779
 780 static OM_uint32
 781 eapGssSmInitGssFlags(OM_uint32 *minor,
 782                      gss_cred_id_t cred GSSEAP_UNUSED,
 783                      gss_ctx_id_t ctx,
 784                      gss_name_t target GSSEAP_UNUSED,
 785                      gss_OID mech GSSEAP_UNUSED,
 786                      OM_uint32 reqFlags GSSEAP_UNUSED,
 787                      OM_uint32 timeReq GSSEAP_UNUSED,
 788                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 789                      gss_buffer_t inputToken GSSEAP_UNUSED,
 790                      gss_buffer_t outputToken,
 791                      OM_uint32 *smFlags GSSEAP_UNUSED)
 792 {
 793     unsigned char wireFlags[4];
 794     gss_buffer_desc flagsBuf;
 795
 796     store_uint32_be(ctx->gssFlags & GSSEAP_WIRE_FLAGS_MASK, wireFlags);
 797
 798     flagsBuf.length = sizeof(wireFlags);
 799     flagsBuf.value = wireFlags;
 800
 801     return duplicateBuffer(minor, &flagsBuf, outputToken);
 802 }
 803
 804 static OM_uint32
 805 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 806                                gss_cred_id_t cred GSSEAP_UNUSED,
 807                                gss_ctx_id_t ctx,
 808                                gss_name_t target GSSEAP_UNUSED,
 809                                gss_OID mech GSSEAP_UNUSED,
 810                                OM_uint32 reqFlags GSSEAP_UNUSED,
 811                                OM_uint32 timeReq GSSEAP_UNUSED,
 812                                gss_channel_bindings_t chanBindings,
 813                                gss_buffer_t inputToken GSSEAP_UNUSED,
 814                                gss_buffer_t outputToken,
 815                                OM_uint32 *smFlags GSSEAP_UNUSED)
 816 {
 817     OM_uint32 major;
 818
 819     if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0 &&
 820         chanBindings != GSS_C_NO_CHANNEL_BINDINGS) {
 821         major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 822                            &chanBindings->application_data, NULL, outputToken);
 823         if (GSS_ERROR(major))
 824             return major;
 825     }
 826
 827     *minor = 0;
 828     return GSS_S_CONTINUE_NEEDED;
 829 }
 830
 831 #ifdef GSSEAP_ENABLE_REAUTH
 832 static OM_uint32
 833 eapGssSmInitReauthCreds(OM_uint32 *minor,
 834                         gss_cred_id_t cred,
 835                         gss_ctx_id_t ctx,
 836                         gss_name_t target GSSEAP_UNUSED,
 837                         gss_OID mech GSSEAP_UNUSED,
 838                         OM_uint32 reqFlags GSSEAP_UNUSED,
 839                         OM_uint32 timeReq GSSEAP_UNUSED,
 840                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 841                         gss_buffer_t inputToken,
 842                         gss_buffer_t outputToken GSSEAP_UNUSED,
 843                         OM_uint32 *smFlags GSSEAP_UNUSED)
 844 {
 845     OM_uint32 major;
 846
 847     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
 848         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 849         if (GSS_ERROR(major))
 850             return major;
 851     }
 852
 853     *minor = 0;
 854     return GSS_S_CONTINUE_NEEDED;
 855 }
 856 #endif /* GSSEAP_ENABLE_REAUTH */
 857
 858 static OM_uint32
 859 eapGssSmInitInitiatorMIC(OM_uint32 *minor,
 860                          gss_cred_id_t cred GSSEAP_UNUSED,
 861                          gss_ctx_id_t ctx,
 862                          gss_name_t target GSSEAP_UNUSED,
 863                          gss_OID mech GSSEAP_UNUSED,
 864                          OM_uint32 reqFlags GSSEAP_UNUSED,
 865                          OM_uint32 timeReq GSSEAP_UNUSED,
 866                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 867                          gss_buffer_t inputToken GSSEAP_UNUSED,
 868                          gss_buffer_t outputToken,
 869                          OM_uint32 *smFlags)
 870 {
 871     OM_uint32 major;
 872
 873     major = gssEapGetConversationMIC(minor, ctx, outputToken);
 874     if (GSS_ERROR(major))
 875         return major;
 876
 877     GSSEAP_SM_TRANSITION_NEXT(ctx);
 878
 879     *minor = 0;
 880     *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 881
 882     return GSS_S_CONTINUE_NEEDED;
 883 }
 884
 885 static OM_uint32
 886 eapGssSmInitAcceptorMIC(OM_uint32 *minor,
 887                         gss_cred_id_t cred GSSEAP_UNUSED,
 888                         gss_ctx_id_t ctx,
 889                         gss_name_t target GSSEAP_UNUSED,
 890                         gss_OID mech GSSEAP_UNUSED,
 891                         OM_uint32 reqFlags GSSEAP_UNUSED,
 892                         OM_uint32 timeReq GSSEAP_UNUSED,
 893                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 894                         gss_buffer_t inputToken,
 895                         gss_buffer_t outputToken GSSEAP_UNUSED,
 896                         OM_uint32 *smFlags GSSEAP_UNUSED)
 897 {
 898     OM_uint32 major;
 899
 900     major = gssEapVerifyConversationMIC(minor, ctx, inputToken);
 901     if (GSS_ERROR(major))
 902         return major;
 903
 904     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 905
 906     *minor = 0;
 907
 908     return GSS_S_COMPLETE;
 909 }
 910
 911 /*
 912  * Initiator state machine.
 913  */
 914 static struct gss_eap_sm eapGssInitiatorSm[] = {
 915     {
 916         ITOK_TYPE_CONTEXT_ERR,
 917         ITOK_TYPE_NONE,
 918         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 919         0,
 920         eapGssSmInitError
 921     },
 922     {
 923         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 924         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 925         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 926         0,
 927         eapGssSmInitAcceptorName
 928     },
 929     {
 930         ITOK_TYPE_SUPPORTED_INITIATOR_EXTS,
 931         ITOK_TYPE_SUPPORTED_ACCEPTOR_EXTS,
 932         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 933         0,
 934         eapGssSmInitExts
 935     },
 936 #ifdef GSSEAP_DEBUG
 937     {
 938         ITOK_TYPE_NONE,
 939         ITOK_TYPE_VENDOR_INFO,
 940         GSSEAP_STATE_INITIAL,
 941         0,
 942         eapGssSmInitVendorInfo
 943     },
 944 #endif
 945 #ifdef GSSEAP_ENABLE_REAUTH
 946     {
 947         ITOK_TYPE_REAUTH_RESP,
 948         ITOK_TYPE_REAUTH_REQ,
 949         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 950         0,
 951         eapGssSmInitGssReauth
 952     },
 953 #endif
 954     {
 955         ITOK_TYPE_NONE,
 956         ITOK_TYPE_NONE,
 957 #ifdef GSSEAP_ENABLE_REAUTH
 958         GSSEAP_STATE_REAUTHENTICATE |
 959 #endif
 960         GSSEAP_STATE_INITIAL,
 961         SM_ITOK_FLAG_REQUIRED,
 962         eapGssSmInitIdentity
 963     },
 964     {
 965         ITOK_TYPE_EAP_REQ,
 966         ITOK_TYPE_EAP_RESP,
 967         GSSEAP_STATE_AUTHENTICATE,
 968         SM_ITOK_FLAG_REQUIRED,
 969         eapGssSmInitAuthenticate
 970     },
 971     {
 972         ITOK_TYPE_NONE,
 973         ITOK_TYPE_GSS_FLAGS,
 974         GSSEAP_STATE_INITIATOR_EXTS,
 975         0,
 976         eapGssSmInitGssFlags
 977     },
 978     {
 979         ITOK_TYPE_NONE,
 980         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 981         GSSEAP_STATE_INITIATOR_EXTS,
 982         0,
 983         eapGssSmInitGssChannelBindings
 984     },
 985     {
 986         ITOK_TYPE_NONE,
 987         ITOK_TYPE_INITIATOR_MIC,
 988         GSSEAP_STATE_INITIATOR_EXTS,
 989         0,
 990         eapGssSmInitInitiatorMIC
 991     },
 992 #ifdef GSSEAP_ENABLE_REAUTH
 993     {
 994         ITOK_TYPE_REAUTH_CREDS,
 995         ITOK_TYPE_NONE,
 996         GSSEAP_STATE_ACCEPTOR_EXTS,
 997         0,
 998         eapGssSmInitReauthCreds
 999     },
1000 #endif
1001     /* other extensions go here */
1002     {
1003         ITOK_TYPE_ACCEPTOR_MIC,
1004         ITOK_TYPE_NONE,
1005         GSSEAP_STATE_ACCEPTOR_EXTS,
1006         SM_ITOK_FLAG_REQUIRED,
1007         eapGssSmInitAcceptorMIC
1008     }
1009 };
1010
1011 OM_uint32
1012 gss_init_sec_context(OM_uint32 *minor,
1013                      gss_cred_id_t cred,
1014                      gss_ctx_id_t *context_handle,
1015                      gss_name_t target_name,
1016                      gss_OID mech_type,
1017                      OM_uint32 req_flags,
1018                      OM_uint32 time_req,
1019                      gss_channel_bindings_t input_chan_bindings,
1020                      gss_buffer_t input_token,
1021                      gss_OID *actual_mech_type,
1022                      gss_buffer_t output_token,
1023                      OM_uint32 *ret_flags,
1024                      OM_uint32 *time_rec)
1025 {
1026     OM_uint32 major, tmpMinor;
1027     gss_ctx_id_t ctx = *context_handle;
1028     int initialContextToken = 0;
1029
1030     *minor = 0;
1031
1032     output_token->length = 0;
1033     output_token->value = NULL;
1034
1035     if (ctx == GSS_C_NO_CONTEXT) {
1036         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
1037             *minor = GSSEAP_WRONG_SIZE;
1038             return GSS_S_DEFECTIVE_TOKEN;
1039         }
1040
1041         major = gssEapAllocContext(minor, &ctx);
1042         if (GSS_ERROR(major))
1043             return major;
1044
1045         ctx->flags |= CTX_FLAG_INITIATOR;
1046         initialContextToken = 1;
1047
1048         *context_handle = ctx;
1049     }
1050
1051     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1052
1053     if (cred == GSS_C_NO_CREDENTIAL) {
1054         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
1055             major = gssEapAcquireCred(minor,
1056                                       GSS_C_NO_NAME,
1057                                       GSS_C_NO_BUFFER,
1058                                       time_req,
1059                                       GSS_C_NO_OID_SET,
1060                                       GSS_C_INITIATE,
1061                                       &ctx->defaultCred,
1062                                       NULL,
1063                                       NULL);
1064             if (GSS_ERROR(major))
1065                 goto cleanup;
1066         }
1067
1068         cred = ctx->defaultCred;
1069     }
1070
1071     GSSEAP_MUTEX_LOCK(&cred->mutex);
1072
1073     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
1074         major = GSS_S_NO_CRED;
1075         *minor = GSSEAP_CRED_USAGE_MISMATCH;
1076         goto cleanup;
1077     }
1078
1079     if (initialContextToken) {
1080         major = initBegin(minor, cred, ctx, target_name, mech_type,
1081                           req_flags, time_req, input_chan_bindings);
1082         if (GSS_ERROR(major))
1083             goto cleanup;
1084     }
1085
1086     major = gssEapSmStep(minor,
1087                          cred,
1088                          ctx,
1089                          target_name,
1090                          mech_type,
1091                          req_flags,
1092                          time_req,
1093                          input_chan_bindings,
1094                          input_token,
1095                          output_token,
1096                          eapGssInitiatorSm,
1097                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
1098     if (GSS_ERROR(major))
1099         goto cleanup;
1100
1101     if (actual_mech_type != NULL) {
1102         OM_uint32 tmpMajor;
1103
1104         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, actual_mech_type);
1105         if (GSS_ERROR(tmpMajor)) {
1106             major = tmpMajor;
1107             *minor = tmpMinor;
1108             goto cleanup;
1109         }
1110     }
1111     if (ret_flags != NULL)
1112         *ret_flags = ctx->gssFlags;
1113     if (time_rec != NULL)
1114         gssEapContextTime(&tmpMinor, ctx, time_rec);
1115
1116     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1117
1118 cleanup:
1119     if (cred != GSS_C_NO_CREDENTIAL)
1120         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1121     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1122
1123     if (GSS_ERROR(major))
1124         gssEapReleaseContext(&tmpMinor, context_handle);
1125
1126     return major;
1127 }