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     krb5_context krbContext;
 203     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 204     krb5_error_code code;
 205     char *identity, *anonymousIdentity;
 206
 207     eapPeerConfig->identity = NULL;
 208     eapPeerConfig->identity_len = 0;
 209     eapPeerConfig->password = NULL;
 210     eapPeerConfig->password_len = 0;
 211
 212     assert(cred != GSS_C_NO_CREDENTIAL);
 213
 214     GSSEAP_KRB_INIT(&krbContext);
 215
 216     eapPeerConfig->fragment_size = 1024;
 217 #ifdef GSSEAP_DEBUG
 218     wpa_debug_level = 0;
 219 #endif
 220
 221     assert(cred->name != GSS_C_NO_NAME);
 222
 223     if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
 224         *minor = GSSEAP_BAD_INITIATOR_NAME;
 225         return GSS_S_BAD_NAME;
 226     }
 227
 228     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 229     if (code != 0) {
 230         *minor = code;
 231         return GSS_S_FAILURE;
 232     }
 233
 234     anonymousIdentity = strchr(identity, '@');
 235     if (anonymousIdentity == NULL)
 236         anonymousIdentity = "";
 237
 238     eapPeerConfig->identity = (unsigned char *)identity;
 239     eapPeerConfig->identity_len = strlen(identity);
 240     eapPeerConfig->anonymous_identity = (unsigned char *)anonymousIdentity;
 241     eapPeerConfig->anonymous_identity_len = strlen(anonymousIdentity);
 242     eapPeerConfig->password = (unsigned char *)cred->password.value;
 243     eapPeerConfig->password_len = cred->password.length;
 244
 245     *minor = 0;
 246     return GSS_S_COMPLETE;
 247 }
 248
 249 static OM_uint32
 250 peerConfigFree(OM_uint32 *minor,
 251                gss_ctx_id_t ctx)
 252 {
 253     krb5_context krbContext;
 254     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 255
 256     GSSEAP_KRB_INIT(&krbContext);
 257
 258     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 259
 260     *minor = 0;
 261     return GSS_S_COMPLETE;
 262 }
 263
 264 /*
 265  * Mark an initiator context as ready for cryptographic operations
 266  */
 267 static OM_uint32
 268 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 269 {
 270     OM_uint32 major;
 271     const unsigned char *key;
 272     size_t keyLength;
 273
 274 #if 1
 275     /* XXX actually check for mutual auth */
 276     if (reqFlags & GSS_C_MUTUAL_FLAG)
 277         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 278 #endif
 279
 280     /* Cache encryption type derived from selected mechanism OID */
 281     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 282     if (GSS_ERROR(major))
 283         return major;
 284
 285     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 286         *minor = GSSEAP_KEY_UNAVAILABLE;
 287         return GSS_S_UNAVAILABLE;
 288     }
 289
 290     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 291
 292     if (keyLength < EAP_EMSK_LEN) {
 293         *minor = GSSEAP_KEY_TOO_SHORT;
 294         return GSS_S_UNAVAILABLE;
 295     }
 296
 297     major = gssEapDeriveRfc3961Key(minor,
 298                                    &key[EAP_EMSK_LEN / 2],
 299                                    EAP_EMSK_LEN / 2,
 300                                    ctx->encryptionType,
 301                                    &ctx->rfc3961Key);
 302        if (GSS_ERROR(major))
 303            return major;
 304
 305     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 306                                       &ctx->checksumType);
 307     if (GSS_ERROR(major))
 308         return major;
 309
 310     major = sequenceInit(minor,
 311                          &ctx->seqState,
 312                          ctx->recvSeq,
 313                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 314                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 315                          TRUE);
 316     if (GSS_ERROR(major))
 317         return major;
 318
 319     *minor = 0;
 320     return GSS_S_COMPLETE;
 321 }
 322
 323 static OM_uint32
 324 initBegin(OM_uint32 *minor,
 325           gss_cred_id_t cred,
 326           gss_ctx_id_t ctx,
 327           gss_name_t target,
 328           gss_OID mech,
 329           OM_uint32 reqFlags GSSEAP_UNUSED,
 330           OM_uint32 timeReq,
 331           gss_channel_bindings_t chanBindings GSSEAP_UNUSED)
 332 {
 333     OM_uint32 major;
 334
 335     assert(cred != GSS_C_NO_CREDENTIAL);
 336
 337     if (cred->expiryTime)
 338         ctx->expiryTime = cred->expiryTime;
 339     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 340         ctx->expiryTime = 0;
 341     else
 342         ctx->expiryTime = time(NULL) + timeReq;
 343
 344     /*
 345      * The credential mutex protects its name, however we need to
 346      * explicitly lock the acceptor name (unlikely as it may be
 347      * that it has attributes set on it).
 348      */
 349     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 350     if (GSS_ERROR(major))
 351         return major;
 352
 353     if (target != GSS_C_NO_NAME) {
 354         GSSEAP_MUTEX_LOCK(&target->mutex);
 355
 356         major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 357         if (GSS_ERROR(major)) {
 358             GSSEAP_MUTEX_UNLOCK(&target->mutex);
 359             return major;
 360         }
 361
 362         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 363     }
 364
 365     if (mech == GSS_C_NULL_OID) {
 366         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 367     } else if (gssEapIsConcreteMechanismOid(mech)) {
 368         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 369             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 370     } else {
 371         major = GSS_S_BAD_MECH;
 372         *minor = GSSEAP_WRONG_MECH;
 373     }
 374     if (GSS_ERROR(major))
 375         return major;
 376
 377     /* If credentials were provided, check they're usable with this mech */
 378     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 379         *minor = GSSEAP_CRED_MECH_MISMATCH;
 380         return GSS_S_BAD_MECH;
 381     }
 382
 383     *minor = 0;
 384     return GSS_S_COMPLETE;
 385 }
 386
 387 static OM_uint32
 388 eapGssSmInitError(OM_uint32 *minor,
 389                   gss_cred_id_t cred GSSEAP_UNUSED,
 390                   gss_ctx_id_t ctx GSSEAP_UNUSED,
 391                   gss_name_t target GSSEAP_UNUSED,
 392                   gss_OID mech GSSEAP_UNUSED,
 393                   OM_uint32 reqFlags GSSEAP_UNUSED,
 394                   OM_uint32 timeReq GSSEAP_UNUSED,
 395                   gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 396                   gss_buffer_t inputToken,
 397                   gss_buffer_t outputToken GSSEAP_UNUSED,
 398                   OM_uint32 *smFlags GSSEAP_UNUSED)
 399 {
 400     OM_uint32 major;
 401     unsigned char *p;
 402
 403     if (inputToken->length < 8) {
 404         *minor = GSSEAP_TOK_TRUNC;
 405         return GSS_S_DEFECTIVE_TOKEN;
 406     }
 407
 408     p = (unsigned char *)inputToken->value;
 409
 410     major = load_uint32_be(&p[0]);
 411     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 412
 413     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 414         major = GSS_S_FAILURE;
 415         *minor = GSSEAP_BAD_ERROR_TOKEN;
 416     }
 417
 418     assert(GSS_ERROR(major));
 419
 420     return major;
 421 }
 422
 423 #ifdef GSSEAP_ENABLE_REAUTH
 424 static OM_uint32
 425 eapGssSmInitGssReauth(OM_uint32 *minor,
 426                       gss_cred_id_t cred,
 427                       gss_ctx_id_t ctx,
 428                       gss_name_t target,
 429                       gss_OID mech GSSEAP_UNUSED,
 430                       OM_uint32 reqFlags,
 431                       OM_uint32 timeReq,
 432                       gss_channel_bindings_t userChanBindings,
 433                       gss_buffer_t inputToken,
 434                       gss_buffer_t outputToken,
 435                       OM_uint32 *smFlags GSSEAP_UNUSED)
 436 {
 437     OM_uint32 major, tmpMinor;
 438     gss_name_t mechTarget = GSS_C_NO_NAME;
 439     gss_OID actualMech = GSS_C_NO_OID;
 440     OM_uint32 gssFlags, timeRec;
 441     struct gss_channel_bindings_struct wireChanBindings = { 0 };
 442
 443     assert(cred != GSS_C_NO_CREDENTIAL);
 444
 445     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 446         if (!gssEapCanReauthP(cred, target, timeReq)) {
 447             major = GSS_S_CONTINUE_NEEDED;
 448             goto cleanup;
 449         }
 450
 451         major = gssEapMakeTokenChannelBindings(minor, ctx,
 452                                                userChanBindings,
 453                                                GSS_C_NO_BUFFER,
 454                                                &wireChanBindings);
 455         if (GSS_ERROR(major))
 456             goto cleanup;
 457
 458         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 459     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 460         major = GSS_S_DEFECTIVE_TOKEN;
 461         *minor = GSSEAP_WRONG_ITOK;
 462         goto cleanup;
 463     }
 464
 465     major = gssEapMechToGlueName(minor, target, &mechTarget);
 466     if (GSS_ERROR(major))
 467         goto cleanup;
 468
 469     major = gssInitSecContext(minor,
 470                               cred->krbCred,
 471                               &ctx->kerberosCtx,
 472                               mechTarget,
 473                               (gss_OID)gss_mech_krb5,
 474                               reqFlags | GSS_C_MUTUAL_FLAG,
 475                               timeReq,
 476                               &wireChanBindings,
 477                               inputToken,
 478                               &actualMech,
 479                               outputToken,
 480                               &gssFlags,
 481                               &timeRec);
 482     if (GSS_ERROR(major))
 483         goto cleanup;
 484
 485     ctx->gssFlags = gssFlags;
 486
 487     if (major == GSS_S_COMPLETE) {
 488         assert(GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE);
 489
 490         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 491         if (GSS_ERROR(major))
 492             goto cleanup;
 493
 494         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ACCEPTOR_EXTS);
 495     } else {
 496         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 497         *smFlags |= SM_FLAG_SEND_TOKEN;
 498     }
 499
 500     major = GSS_S_CONTINUE_NEEDED;
 501
 502 cleanup:
 503     gssReleaseName(&tmpMinor, &mechTarget);
 504     gss_release_buffer(&tmpMinor, &wireChanBindings.application_data);
 505
 506     return major;
 507 }
 508 #endif /* GSSEAP_ENABLE_REAUTH */
 509
 510 #ifdef GSSEAP_DEBUG
 511 static OM_uint32
 512 eapGssSmInitVendorInfo(OM_uint32 *minor,
 513                        gss_cred_id_t cred GSSEAP_UNUSED,
 514                        gss_ctx_id_t ctx GSSEAP_UNUSED,
 515                        gss_name_t target GSSEAP_UNUSED,
 516                        gss_OID mech GSSEAP_UNUSED,
 517                        OM_uint32 reqFlags GSSEAP_UNUSED,
 518                        OM_uint32 timeReq GSSEAP_UNUSED,
 519                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 520                        gss_buffer_t inputToken GSSEAP_UNUSED,
 521                        gss_buffer_t outputToken,
 522                        OM_uint32 *smFlags GSSEAP_UNUSED)
 523 {
 524     OM_uint32 major;
 525
 526     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 527     if (GSS_ERROR(major))
 528         return major;
 529
 530     return GSS_S_CONTINUE_NEEDED;
 531 }
 532 #endif
 533
 534 static OM_uint32
 535 eapGssSmInitAcceptorName(OM_uint32 *minor,
 536                          gss_cred_id_t cred GSSEAP_UNUSED,
 537                          gss_ctx_id_t ctx,
 538                          gss_name_t target GSSEAP_UNUSED,
 539                          gss_OID mech GSSEAP_UNUSED,
 540                          OM_uint32 reqFlags GSSEAP_UNUSED,
 541                          OM_uint32 timeReq GSSEAP_UNUSED,
 542                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 543                          gss_buffer_t inputToken GSSEAP_UNUSED,
 544                          gss_buffer_t outputToken,
 545                          OM_uint32 *smFlags GSSEAP_UNUSED)
 546 {
 547     OM_uint32 major;
 548
 549     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 550         ctx->acceptorName != GSS_C_NO_NAME) {
 551
 552         /* Send desired target name to acceptor */
 553         major = gssEapDisplayName(minor, ctx->acceptorName,
 554                                   outputToken, NULL);
 555         if (GSS_ERROR(major))
 556             return major;
 557     } else if (inputToken != GSS_C_NO_BUFFER &&
 558                ctx->acceptorName == GSS_C_NO_NAME) {
 559         /* Accept target name hint from acceptor */
 560         major = gssEapImportName(minor, inputToken,
 561                                  GSS_C_NT_USER_NAME, &ctx->acceptorName);
 562         if (GSS_ERROR(major))
 563             return major;
 564     }
 565
 566     /*
 567      * Currently, other parts of the code assume that the acceptor name
 568      * is available, hence this check.
 569      */
 570     if (ctx->acceptorName == GSS_C_NO_NAME) {
 571         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 572         return GSS_S_FAILURE;
 573     }
 574
 575     return GSS_S_CONTINUE_NEEDED;
 576 }
 577
 578 static OM_uint32
 579 gssEapSupportedAcceptorExts[] = {
 580     ITOK_TYPE_REAUTH_CREDS,
 581 };
 582
 583 static struct gss_eap_itok_map
 584 gssEapInitiatorExtsFlagMap[] = {
 585 };
 586
 587 static OM_uint32
 588 eapGssSmInitExts(OM_uint32 *minor,
 589                  gss_cred_id_t cred GSSEAP_UNUSED,
 590                  gss_ctx_id_t ctx GSSEAP_UNUSED,
 591                  gss_name_t target GSSEAP_UNUSED,
 592                  gss_OID mech GSSEAP_UNUSED,
 593                  OM_uint32 reqFlags GSSEAP_UNUSED,
 594                  OM_uint32 timeReq GSSEAP_UNUSED,
 595                  gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 596                  gss_buffer_t inputToken,
 597                  gss_buffer_t outputToken,
 598                  OM_uint32 *smFlags GSSEAP_UNUSED)
 599 {
 600     OM_uint32 major = GSS_S_COMPLETE;
 601
 602     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 603         major = gssEapEncodeSupportedExts(minor,
 604                                           gssEapSupportedAcceptorExts,
 605                                           sizeof(gssEapSupportedAcceptorExts) /
 606                                             sizeof(gssEapSupportedAcceptorExts[0]),
 607                                           outputToken);
 608     } else if (inputToken != GSS_C_NO_BUFFER) {
 609         major = gssEapProcessSupportedExts(minor, inputToken,
 610                                           gssEapInitiatorExtsFlagMap,
 611                                           sizeof(gssEapInitiatorExtsFlagMap) /
 612                                             sizeof(gssEapInitiatorExtsFlagMap[0]),
 613                                           &ctx->flags);
 614     }
 615
 616     if (GSS_ERROR(major))
 617         return major;
 618
 619     return GSS_S_CONTINUE_NEEDED;
 620 }
 621
 622 static OM_uint32
 623 eapGssSmInitIdentity(OM_uint32 *minor,
 624                      gss_cred_id_t cred GSSEAP_UNUSED,
 625                      gss_ctx_id_t ctx,
 626                      gss_name_t target GSSEAP_UNUSED,
 627                      gss_OID mech GSSEAP_UNUSED,
 628                      OM_uint32 reqFlags GSSEAP_UNUSED,
 629                      OM_uint32 timeReq GSSEAP_UNUSED,
 630                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 631                      gss_buffer_t inputToken GSSEAP_UNUSED,
 632                      gss_buffer_t outputToken GSSEAP_UNUSED,
 633                      OM_uint32 *smFlags)
 634 {
 635     struct eap_config eapConfig;
 636
 637 #ifdef GSSEAP_ENABLE_REAUTH
 638     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 639         OM_uint32 tmpMinor;
 640
 641         /* server didn't support reauthentication, sent EAP request */
 642         gssDeleteSecContext(&tmpMinor, &ctx->kerberosCtx, GSS_C_NO_BUFFER);
 643         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 644         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 645     } else
 646 #endif
 647         *smFlags |= SM_FLAG_SEND_TOKEN;
 648
 649     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 650     assert(inputToken == GSS_C_NO_BUFFER);
 651
 652     memset(&eapConfig, 0, sizeof(eapConfig));
 653
 654     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 655                                              &gssEapPolicyCallbacks,
 656                                              ctx,
 657                                              &eapConfig);
 658     if (ctx->initiatorCtx.eap == NULL) {
 659         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 660         return GSS_S_FAILURE;
 661     }
 662
 663     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 664
 665     /* poke EAP state machine */
 666     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 667         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 668         return GSS_S_FAILURE;
 669     }
 670
 671     GSSEAP_SM_TRANSITION_NEXT(ctx);
 672
 673     *minor = 0;
 674
 675     return GSS_S_CONTINUE_NEEDED;
 676 }
 677
 678 static OM_uint32
 679 eapGssSmInitAuthenticate(OM_uint32 *minor,
 680                          gss_cred_id_t cred,
 681                          gss_ctx_id_t ctx,
 682                          gss_name_t target GSSEAP_UNUSED,
 683                          gss_OID mech GSSEAP_UNUSED,
 684                          OM_uint32 reqFlags GSSEAP_UNUSED,
 685                          OM_uint32 timeReq GSSEAP_UNUSED,
 686                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 687                          gss_buffer_t inputToken GSSEAP_UNUSED,
 688                          gss_buffer_t outputToken,
 689                          OM_uint32 *smFlags)
 690 {
 691     OM_uint32 major;
 692     OM_uint32 tmpMinor;
 693     int code;
 694     struct wpabuf *resp = NULL;
 695
 696     *minor = 0;
 697
 698     assert(inputToken != GSS_C_NO_BUFFER);
 699
 700     major = peerConfigInit(minor, cred, ctx);
 701     if (GSS_ERROR(major))
 702         goto cleanup;
 703
 704     assert(ctx->initiatorCtx.eap != NULL);
 705     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 706
 707     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 708
 709     wpabuf_set(&ctx->initiatorCtx.reqData,
 710                inputToken->value, inputToken->length);
 711
 712     major = GSS_S_CONTINUE_NEEDED;
 713
 714     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 715     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 716         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 717
 718         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 719     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 720         major = initReady(minor, ctx, reqFlags);
 721         if (GSS_ERROR(major))
 722             goto cleanup;
 723
 724         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 725         major = GSS_S_CONTINUE_NEEDED;
 726         GSSEAP_SM_TRANSITION_NEXT(ctx);
 727     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 728         major = GSS_S_DEFECTIVE_CREDENTIAL;
 729         *minor = GSSEAP_PEER_AUTH_FAILURE;
 730     } else {
 731         major = GSS_S_DEFECTIVE_TOKEN;
 732         *minor = GSSEAP_PEER_BAD_MESSAGE;
 733     }
 734
 735 cleanup:
 736     if (resp != NULL) {
 737         OM_uint32 tmpMajor;
 738         gss_buffer_desc respBuf;
 739
 740         assert(major == GSS_S_CONTINUE_NEEDED);
 741
 742         respBuf.length = wpabuf_len(resp);
 743         respBuf.value = (void *)wpabuf_head(resp);
 744
 745         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 746         if (GSS_ERROR(tmpMajor)) {
 747             major = tmpMajor;
 748             *minor = tmpMinor;
 749         }
 750
 751         *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 752     }
 753
 754     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 755     peerConfigFree(&tmpMinor, ctx);
 756
 757     return major;
 758 }
 759
 760 static OM_uint32
 761 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 762                                gss_cred_id_t cred GSSEAP_UNUSED,
 763                                gss_ctx_id_t ctx,
 764                                gss_name_t target GSSEAP_UNUSED,
 765                                gss_OID mech GSSEAP_UNUSED,
 766                                OM_uint32 reqFlags GSSEAP_UNUSED,
 767                                OM_uint32 timeReq GSSEAP_UNUSED,
 768                                gss_channel_bindings_t chanBindings,
 769                                gss_buffer_t inputToken GSSEAP_UNUSED,
 770                                gss_buffer_t outputToken,
 771                                OM_uint32 *smFlags)
 772 {
 773     OM_uint32 major;
 774     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 775
 776     if (ctx->flags & CTX_FLAG_KRB_REAUTH)
 777         return GSS_S_CONTINUE_NEEDED;
 778
 779     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 780         buffer = chanBindings->application_data;
 781
 782     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 783                        &buffer, NULL, outputToken);
 784     if (GSS_ERROR(major))
 785         return major;
 786
 787     assert(outputToken->value != NULL);
 788
 789     *minor = 0;
 790     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 791
 792     return GSS_S_CONTINUE_NEEDED;
 793 }
 794
 795 #ifdef GSSEAP_ENABLE_REAUTH
 796 static OM_uint32
 797 eapGssSmInitReauthCreds(OM_uint32 *minor,
 798                         gss_cred_id_t cred,
 799                         gss_ctx_id_t ctx,
 800                         gss_name_t target GSSEAP_UNUSED,
 801                         gss_OID mech GSSEAP_UNUSED,
 802                         OM_uint32 reqFlags GSSEAP_UNUSED,
 803                         OM_uint32 timeReq GSSEAP_UNUSED,
 804                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 805                         gss_buffer_t inputToken,
 806                         gss_buffer_t outputToken GSSEAP_UNUSED,
 807                         OM_uint32 *smFlags GSSEAP_UNUSED)
 808 {
 809     OM_uint32 major;
 810
 811     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
 812         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 813         if (GSS_ERROR(major))
 814             return major;
 815     }
 816
 817     *minor = 0;
 818     return GSS_S_CONTINUE_NEEDED;
 819 }
 820 #endif /* GSSEAP_ENABLE_REAUTH */
 821
 822 static OM_uint32
 823 eapGssSmInitInitiatorMIC(OM_uint32 *minor,
 824                          gss_cred_id_t cred GSSEAP_UNUSED,
 825                          gss_ctx_id_t ctx,
 826                          gss_name_t target GSSEAP_UNUSED,
 827                          gss_OID mech GSSEAP_UNUSED,
 828                          OM_uint32 reqFlags GSSEAP_UNUSED,
 829                          OM_uint32 timeReq GSSEAP_UNUSED,
 830                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 831                          gss_buffer_t inputToken GSSEAP_UNUSED,
 832                          gss_buffer_t outputToken,
 833                          OM_uint32 *smFlags)
 834 {
 835     OM_uint32 major;
 836
 837     major = gssEapGetConversationMIC(minor, ctx, outputToken);
 838     if (GSS_ERROR(major))
 839         return major;
 840
 841     GSSEAP_SM_TRANSITION_NEXT(ctx);
 842
 843     *minor = 0;
 844     *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 845
 846     return GSS_S_CONTINUE_NEEDED;
 847 }
 848
 849 static OM_uint32
 850 eapGssSmInitAcceptorMIC(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,
 859                         gss_buffer_t outputToken GSSEAP_UNUSED,
 860                         OM_uint32 *smFlags GSSEAP_UNUSED)
 861 {
 862     OM_uint32 major;
 863
 864     major = gssEapVerifyConversationMIC(minor, ctx, inputToken);
 865     if (GSS_ERROR(major))
 866         return major;
 867
 868     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 869
 870     *minor = 0;
 871
 872     return GSS_S_COMPLETE;
 873 }
 874
 875 /*
 876  * Initiator state machine.
 877  */
 878 static struct gss_eap_sm eapGssInitiatorSm[] = {
 879     {
 880         ITOK_TYPE_CONTEXT_ERR,
 881         ITOK_TYPE_NONE,
 882         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 883         0,
 884         eapGssSmInitError
 885     },
 886     {
 887         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 888         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 889         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 890         0,
 891         eapGssSmInitAcceptorName
 892     },
 893     {
 894         ITOK_TYPE_SUPPORTED_INITIATOR_EXTS,
 895         ITOK_TYPE_SUPPORTED_ACCEPTOR_EXTS,
 896         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 897         0,
 898         eapGssSmInitExts
 899     },
 900 #ifdef GSSEAP_DEBUG
 901     {
 902         ITOK_TYPE_NONE,
 903         ITOK_TYPE_VENDOR_INFO,
 904         GSSEAP_STATE_INITIAL,
 905         0,
 906         eapGssSmInitVendorInfo
 907     },
 908 #endif
 909 #ifdef GSSEAP_ENABLE_REAUTH
 910     {
 911         ITOK_TYPE_REAUTH_RESP,
 912         ITOK_TYPE_REAUTH_REQ,
 913         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 914         0,
 915         eapGssSmInitGssReauth
 916     },
 917 #endif
 918     {
 919         ITOK_TYPE_NONE,
 920         ITOK_TYPE_NONE,
 921 #ifdef GSSEAP_ENABLE_REAUTH
 922         GSSEAP_STATE_REAUTHENTICATE |
 923 #endif
 924         GSSEAP_STATE_INITIAL,
 925         SM_ITOK_FLAG_REQUIRED,
 926         eapGssSmInitIdentity
 927     },
 928     {
 929         ITOK_TYPE_EAP_REQ,
 930         ITOK_TYPE_EAP_RESP,
 931         GSSEAP_STATE_AUTHENTICATE,
 932         SM_ITOK_FLAG_REQUIRED,
 933         eapGssSmInitAuthenticate
 934     },
 935     {
 936         ITOK_TYPE_NONE,
 937         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 938         GSSEAP_STATE_INITIATOR_EXTS,
 939         0,
 940         eapGssSmInitGssChannelBindings
 941     },
 942     {
 943         ITOK_TYPE_NONE,
 944         ITOK_TYPE_INITIATOR_MIC,
 945         GSSEAP_STATE_INITIATOR_EXTS,
 946         0,
 947         eapGssSmInitInitiatorMIC
 948     },
 949 #ifdef GSSEAP_ENABLE_REAUTH
 950     {
 951         ITOK_TYPE_REAUTH_CREDS,
 952         ITOK_TYPE_NONE,
 953         GSSEAP_STATE_ACCEPTOR_EXTS,
 954         0,
 955         eapGssSmInitReauthCreds
 956     },
 957 #endif
 958     /* other extensions go here */
 959     {
 960         ITOK_TYPE_ACCEPTOR_MIC,
 961         ITOK_TYPE_NONE,
 962         GSSEAP_STATE_ACCEPTOR_EXTS,
 963         SM_ITOK_FLAG_REQUIRED,
 964         eapGssSmInitAcceptorMIC
 965     }
 966 };
 967
 968 OM_uint32
 969 gss_init_sec_context(OM_uint32 *minor,
 970                      gss_cred_id_t cred,
 971                      gss_ctx_id_t *context_handle,
 972                      gss_name_t target_name,
 973                      gss_OID mech_type,
 974                      OM_uint32 req_flags,
 975                      OM_uint32 time_req,
 976                      gss_channel_bindings_t input_chan_bindings,
 977                      gss_buffer_t input_token,
 978                      gss_OID *actual_mech_type,
 979                      gss_buffer_t output_token,
 980                      OM_uint32 *ret_flags,
 981                      OM_uint32 *time_rec)
 982 {
 983     OM_uint32 major, tmpMinor;
 984     gss_ctx_id_t ctx = *context_handle;
 985
 986     *minor = 0;
 987
 988     output_token->length = 0;
 989     output_token->value = NULL;
 990
 991     if (ctx == GSS_C_NO_CONTEXT) {
 992         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 993             *minor = GSSEAP_WRONG_SIZE;
 994             return GSS_S_DEFECTIVE_TOKEN;
 995         }
 996
 997         major = gssEapAllocContext(minor, &ctx);
 998         if (GSS_ERROR(major))
 999             return major;
1000
1001         ctx->flags |= CTX_FLAG_INITIATOR;
1002
1003         major = initBegin(minor, cred, ctx, target_name, mech_type,
1004                           req_flags, time_req, input_chan_bindings);
1005         if (GSS_ERROR(major)) {
1006             gssEapReleaseContext(minor, &ctx);
1007             return major;
1008         }
1009
1010         *context_handle = ctx;
1011     }
1012
1013     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1014
1015     if (cred == GSS_C_NO_CREDENTIAL) {
1016         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
1017             major = gssEapAcquireCred(minor,
1018                                       GSS_C_NO_NAME,
1019                                       GSS_C_NO_BUFFER,
1020                                       time_req,
1021                                       GSS_C_NO_OID_SET,
1022                                       GSS_C_INITIATE,
1023                                       &ctx->defaultCred,
1024                                       NULL,
1025                                       NULL);
1026             if (GSS_ERROR(major))
1027                 goto cleanup;
1028         }
1029
1030         cred = ctx->defaultCred;
1031     }
1032
1033     GSSEAP_MUTEX_LOCK(&cred->mutex);
1034
1035
1036     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
1037         major = GSS_S_NO_CRED;
1038         *minor = GSSEAP_CRED_USAGE_MISMATCH;
1039         goto cleanup;
1040     }
1041
1042     major = gssEapSmStep(minor,
1043                          cred,
1044                          ctx,
1045                          target_name,
1046                          mech_type,
1047                          req_flags,
1048                          time_req,
1049                          input_chan_bindings,
1050                          input_token,
1051                          output_token,
1052                          eapGssInitiatorSm,
1053                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
1054     if (GSS_ERROR(major))
1055         goto cleanup;
1056
1057     if (actual_mech_type != NULL) {
1058         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
1059             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
1060     }
1061     if (ret_flags != NULL)
1062         *ret_flags = ctx->gssFlags;
1063     if (time_rec != NULL)
1064         gssEapContextTime(&tmpMinor, ctx, time_rec);
1065
1066     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1067
1068 cleanup:
1069     if (cred != GSS_C_NO_CREDENTIAL)
1070         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1071     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1072
1073     if (GSS_ERROR(major))
1074         gssEapReleaseContext(&tmpMinor, context_handle);
1075
1076     return major;
1077 }