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