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 #include "radius/radius.h"
  40 #include "util_radius.h"
  41 #include "utils/radius_utils.h"
  42
  43 /* methods allowed for phase1 authentication*/
  44 static const struct eap_method_type allowed_eap_method_types[] = {
  45     {EAP_VENDOR_IETF, EAP_TYPE_TTLS},
  46     {EAP_VENDOR_IETF, EAP_TYPE_NONE}};
  47
  48 static OM_uint32
  49 policyVariableToFlag(enum eapol_bool_var variable)
  50 {
  51     OM_uint32 flag = 0;
  52
  53     switch (variable) {
  54     case EAPOL_eapSuccess:
  55         flag = CTX_FLAG_EAP_SUCCESS;
  56         break;
  57     case EAPOL_eapRestart:
  58         flag = CTX_FLAG_EAP_RESTART;
  59         break;
  60     case EAPOL_eapFail:
  61         flag = CTX_FLAG_EAP_FAIL;
  62         break;
  63     case EAPOL_eapResp:
  64         flag = CTX_FLAG_EAP_RESP;
  65         break;
  66     case EAPOL_eapNoResp:
  67         flag = CTX_FLAG_EAP_NO_RESP;
  68         break;
  69     case EAPOL_eapReq:
  70         flag = CTX_FLAG_EAP_REQ;
  71         break;
  72     case EAPOL_portEnabled:
  73         flag = CTX_FLAG_EAP_PORT_ENABLED;
  74         break;
  75     case EAPOL_altAccept:
  76         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  77         break;
  78     case EAPOL_altReject:
  79         flag = CTX_FLAG_EAP_ALT_REJECT;
  80         break;
  81     }
  82
  83     return flag;
  84 }
  85
  86 static struct eap_peer_config *
  87 peerGetConfig(void *ctx)
  88 {
  89     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  90
  91     return &gssCtx->initiatorCtx.eapPeerConfig;
  92 }
  93
  94 static Boolean
  95 peerGetBool(void *data, enum eapol_bool_var variable)
  96 {
  97     gss_ctx_id_t ctx = data;
  98     OM_uint32 flag;
  99
 100     if (ctx == GSS_C_NO_CONTEXT)
 101         return FALSE;
 102
 103     flag = policyVariableToFlag(variable);
 104
 105     return ((ctx->flags & flag) != 0);
 106 }
 107
 108 static void
 109 peerSetBool(void *data, enum eapol_bool_var variable,
 110             Boolean value)
 111 {
 112     gss_ctx_id_t ctx = data;
 113     OM_uint32 flag;
 114
 115     if (ctx == GSS_C_NO_CONTEXT)
 116         return;
 117
 118     flag = policyVariableToFlag(variable);
 119
 120     if (value)
 121         ctx->flags |= flag;
 122     else
 123         ctx->flags &= ~(flag);
 124 }
 125
 126 static unsigned int
 127 peerGetInt(void *data, enum eapol_int_var variable)
 128 {
 129     gss_ctx_id_t ctx = data;
 130
 131     if (ctx == GSS_C_NO_CONTEXT)
 132         return FALSE;
 133
 134     GSSEAP_ASSERT(CTX_IS_INITIATOR(ctx));
 135
 136     switch (variable) {
 137     case EAPOL_idleWhile:
 138         return ctx->initiatorCtx.idleWhile;
 139         break;
 140     }
 141
 142     return 0;
 143 }
 144
 145 static void
 146 peerSetInt(void *data, enum eapol_int_var variable,
 147            unsigned int value)
 148 {
 149     gss_ctx_id_t ctx = data;
 150
 151     if (ctx == GSS_C_NO_CONTEXT)
 152         return;
 153
 154     GSSEAP_ASSERT(CTX_IS_INITIATOR(ctx));
 155
 156     switch (variable) {
 157     case EAPOL_idleWhile:
 158         ctx->initiatorCtx.idleWhile = value;
 159         break;
 160     }
 161 }
 162
 163 static struct wpabuf *
 164 peerGetEapReqData(void *ctx)
 165 {
 166     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 167
 168     return &gssCtx->initiatorCtx.reqData;
 169 }
 170
 171 static void
 172 peerSetConfigBlob(void *ctx GSSEAP_UNUSED,
 173                   struct wpa_config_blob *blob GSSEAP_UNUSED)
 174 {
 175 }
 176
 177 static const struct wpa_config_blob *
 178 peerGetConfigBlob(void *ctx,
 179                   const char *name)
 180 {
 181     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 182     size_t index;
 183
 184     if (strcmp(name, "client-cert") == 0)
 185         index = CONFIG_BLOB_CLIENT_CERT;
 186     else if (strcmp(name, "private-key") == 0)
 187         index = CONFIG_BLOB_PRIVATE_KEY;
 188     else if (strcmp(name, "ca-cert") == 0)
 189         index = CONFIG_BLOB_CA_CERT;
 190     else
 191         return NULL;
 192
 193     return &gssCtx->initiatorCtx.configBlobs[index];
 194 }
 195
 196 static void
 197 peerNotifyPending(void *ctx GSSEAP_UNUSED)
 198 {
 199 }
 200
 201 static struct eapol_callbacks gssEapPolicyCallbacks = {
 202     peerGetConfig,
 203     peerGetBool,
 204     peerSetBool,
 205     peerGetInt,
 206     peerSetInt,
 207     peerGetEapReqData,
 208     peerSetConfigBlob,
 209     peerGetConfigBlob,
 210     peerNotifyPending,
 211 };
 212
 213 extern int wpa_debug_level;
 214
 215 #define CHBIND_SERVICE_NAME_FLAG        0x01
 216 #define CHBIND_HOST_NAME_FLAG           0x02
 217 #define CHBIND_SERVICE_SPECIFIC_FLAG    0x04
 218 #define CHBIND_REALM_NAME_FLAG          0x08
 219
 220 static OM_uint32
 221 peerInitEapChannelBinding(OM_uint32 *minor, gss_ctx_id_t ctx)
 222 {
 223     struct wpabuf *buf = NULL;
 224     unsigned int chbindReqFlags = 0;
 225     krb5_principal princ = NULL;
 226     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 227     OM_uint32 major = GSS_S_COMPLETE;
 228     krb5_context krbContext = NULL;
 229
 230     /* XXX is this check redundant? */
 231     if (ctx->acceptorName == GSS_C_NO_NAME) {
 232         major = GSS_S_BAD_NAME;
 233         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 234         goto cleanup;
 235     }
 236
 237     princ = ctx->acceptorName->krbPrincipal;
 238
 239     krbPrincComponentToGssBuffer(princ, 0, &nameBuf);
 240     if (nameBuf.length > 0) {
 241         major = gssEapRadiusAddAttr(minor, &buf, PW_GSS_ACCEPTOR_SERVICE_NAME,
 242                                     0, &nameBuf);
 243         if (GSS_ERROR(major))
 244             goto cleanup;
 245
 246         chbindReqFlags |= CHBIND_SERVICE_NAME_FLAG;
 247     }
 248
 249     krbPrincComponentToGssBuffer(princ, 1, &nameBuf);
 250     if (nameBuf.length > 0) {
 251         major = gssEapRadiusAddAttr(minor, &buf, PW_GSS_ACCEPTOR_HOST_NAME,
 252                                     0, &nameBuf);
 253         if (GSS_ERROR(major))
 254             goto cleanup;
 255
 256         chbindReqFlags |= CHBIND_HOST_NAME_FLAG;
 257     }
 258
 259     GSSEAP_KRB_INIT(&krbContext);
 260
 261     *minor = krbPrincUnparseServiceSpecifics(krbContext, princ, &nameBuf);
 262     if (*minor != 0)
 263         goto cleanup;
 264
 265     if (nameBuf.length > 0) {
 266         major = gssEapRadiusAddAttr(minor, &buf,
 267                                     PW_GSS_ACCEPTOR_SERVICE_SPECIFICS,
 268                                     0, &nameBuf);
 269         if (GSS_ERROR(major))
 270             goto cleanup;
 271
 272         chbindReqFlags |= CHBIND_SERVICE_SPECIFIC_FLAG;
 273     }
 274
 275     krbFreeUnparsedName(krbContext, &nameBuf);
 276     krbPrincRealmToGssBuffer(princ, &nameBuf);
 277
 278     if (nameBuf.length > 0) {
 279         major = gssEapRadiusAddAttr(minor, &buf,
 280                                     PW_GSS_ACCEPTOR_REALM_NAME,
 281                                     0, &nameBuf);
 282         if (GSS_ERROR(major))
 283             goto cleanup;
 284
 285         chbindReqFlags |= CHBIND_REALM_NAME_FLAG;
 286     }
 287
 288     if (chbindReqFlags == 0) {
 289         major = GSS_S_BAD_NAME;
 290         *minor = GSSEAP_BAD_ACCEPTOR_NAME;
 291         goto cleanup;
 292     }
 293
 294     ctx->initiatorCtx.chbindData = buf;
 295     ctx->initiatorCtx.chbindReqFlags = chbindReqFlags;
 296
 297     buf = NULL;
 298
 299     major = GSS_S_COMPLETE;
 300     *minor = 0;
 301
 302 cleanup:
 303     /*namebuf is freed when used and may be left with a unowned pointer*/
 304     wpabuf_free(buf);
 305
 306     return major;
 307 }
 308
 309 static void
 310 peerProcessChbindResponse(void *context, int code, int nsid,
 311                           u8 *data, size_t len)
 312 {
 313     radius_parser msg;
 314     gss_ctx_id_t ctx = (gss_ctx_id_t )context;
 315     void *vsadata;
 316     u8 type;
 317     u32 vendor_id;
 318     u32 chbindRetFlags = 0;
 319     size_t vsadata_len;
 320
 321     if (nsid != CHBIND_NSID_RADIUS)
 322         return;
 323
 324     if (data == NULL)
 325         return;
 326     msg = radius_parser_start(data, len);
 327     if (msg == NULL)
 328         return;
 329
 330     while (radius_parser_parse_tlv(msg, &type, &vendor_id, &vsadata,
 331                                    &vsadata_len) == 0) {
 332         switch (type) {
 333         case PW_GSS_ACCEPTOR_SERVICE_NAME:
 334             chbindRetFlags |= CHBIND_SERVICE_NAME_FLAG;
 335             break;
 336         case PW_GSS_ACCEPTOR_HOST_NAME:
 337             chbindRetFlags |= CHBIND_HOST_NAME_FLAG;
 338             break;
 339         case PW_GSS_ACCEPTOR_SERVICE_SPECIFICS:
 340             chbindRetFlags |= CHBIND_SERVICE_SPECIFIC_FLAG;
 341             break;
 342         case PW_GSS_ACCEPTOR_REALM_NAME:
 343             chbindRetFlags |= CHBIND_REALM_NAME_FLAG;
 344             break;
 345         }
 346     }
 347
 348     radius_parser_finish(msg);
 349
 350     if (code == CHBIND_CODE_SUCCESS &&
 351         ((chbindRetFlags & ctx->initiatorCtx.chbindReqFlags) == ctx->initiatorCtx.chbindReqFlags)) {
 352         ctx->flags |= CTX_FLAG_EAP_CHBIND_ACCEPT;
 353         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 354     } /* else log failures? */
 355 }
 356
 357 static OM_uint32
 358 peerConfigInit(OM_uint32 *minor, gss_ctx_id_t ctx)
 359 {
 360     OM_uint32 major;
 361     krb5_context krbContext;
 362     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 363     struct wpa_config_blob *configBlobs = ctx->initiatorCtx.configBlobs;
 364     gss_buffer_desc identity = GSS_C_EMPTY_BUFFER;
 365     gss_buffer_desc realm = GSS_C_EMPTY_BUFFER;
 366     gss_cred_id_t cred = ctx->cred;
 367     char *debug_file = NULL;
 368
 369     eapPeerConfig->identity = NULL;
 370     eapPeerConfig->identity_len = 0;
 371     eapPeerConfig->anonymous_identity = NULL;
 372     eapPeerConfig->anonymous_identity_len = 0;
 373     eapPeerConfig->password = NULL;
 374     eapPeerConfig->password_len = 0;
 375     eapPeerConfig->eap_methods = (struct eap_method_type *) allowed_eap_method_types;
 376
 377     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 378
 379     GSSEAP_KRB_INIT(&krbContext);
 380
 381     eapPeerConfig->fragment_size = 1024;
 382     wpa_debug_level = MSG_ERROR;
 383     if ((debug_file = getenv("GSSEAP_TRACE")) != NULL) {
 384             wpa_debug_open_file(debug_file);
 385             wpa_debug_level = 0;
 386         }
 387
 388     GSSEAP_ASSERT(cred->name != GSS_C_NO_NAME);
 389
 390     if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
 391         *minor = GSSEAP_BAD_INITIATOR_NAME;
 392         return GSS_S_BAD_NAME;
 393     }
 394
 395     /* identity */
 396     major = gssEapDisplayName(minor, cred->name, &identity, NULL);
 397     if (GSS_ERROR(major))
 398         return major;
 399
 400     eapPeerConfig->identity = (unsigned char *)identity.value;
 401     eapPeerConfig->identity_len = identity.length;
 402
 403     krbPrincRealmToGssBuffer(cred->name->krbPrincipal, &realm);
 404
 405     /* anonymous_identity */
 406     eapPeerConfig->anonymous_identity = GSSEAP_MALLOC(realm.length + 2);
 407     if (eapPeerConfig->anonymous_identity == NULL) {
 408         *minor = ENOMEM;
 409         return GSS_S_FAILURE;
 410     }
 411
 412     eapPeerConfig->anonymous_identity[0] = '@';
 413     memcpy(eapPeerConfig->anonymous_identity + 1, realm.value, realm.length);
 414     eapPeerConfig->anonymous_identity[1 + realm.length] = '\0';
 415     eapPeerConfig->anonymous_identity_len = 1 + realm.length;
 416
 417     /* password */
 418     if ((cred->flags & CRED_FLAG_CERTIFICATE) == 0) {
 419         eapPeerConfig->password = (unsigned char *)cred->password.value;
 420         eapPeerConfig->password_len = cred->password.length;
 421     }
 422
 423     /* certs */
 424     eapPeerConfig->ca_cert = (unsigned char *)cred->caCertificate.value;
 425     eapPeerConfig->subject_match = (unsigned char *)cred->subjectNameConstraint.value;
 426     eapPeerConfig->altsubject_match = (unsigned char *)cred->subjectAltNameConstraint.value;
 427     configBlobs[CONFIG_BLOB_CA_CERT].data = cred->caCertificateBlob.value;
 428     configBlobs[CONFIG_BLOB_CA_CERT].len = cred->caCertificateBlob.length;
 429
 430     /* eap channel binding */
 431     if (ctx->initiatorCtx.chbindData != NULL) {
 432         struct eap_peer_chbind_config *chbind_config =
 433             (struct eap_peer_chbind_config *)GSSEAP_MALLOC(sizeof(struct eap_peer_chbind_config));
 434         if (chbind_config == NULL) {
 435             *minor = ENOMEM;
 436             return GSS_S_FAILURE;
 437         }
 438
 439         chbind_config->req_data = wpabuf_mhead_u8(ctx->initiatorCtx.chbindData);
 440         chbind_config->req_data_len = wpabuf_len(ctx->initiatorCtx.chbindData);
 441         chbind_config->nsid = CHBIND_NSID_RADIUS;
 442         chbind_config->response_cb = &peerProcessChbindResponse;
 443         chbind_config->ctx = ctx;
 444         eapPeerConfig->chbind_config = chbind_config;
 445         eapPeerConfig->chbind_config_len = 1;
 446     } else {
 447         eapPeerConfig->chbind_config = NULL;
 448         eapPeerConfig->chbind_config_len = 0;
 449     }
 450     if (cred->flags & CRED_FLAG_CERTIFICATE) {
 451         /*
 452          * CRED_FLAG_CONFIG_BLOB is an internal flag which will be used in the
 453          * future to directly pass certificate and private key data to the
 454          * EAP implementation, rather than an indirected string pointer.
 455          */
 456         if (cred->flags & CRED_FLAG_CONFIG_BLOB) {
 457             eapPeerConfig->client_cert = (unsigned char *)"blob://client-cert";
 458             configBlobs[CONFIG_BLOB_CLIENT_CERT].data = cred->clientCertificate.value;
 459             configBlobs[CONFIG_BLOB_CLIENT_CERT].len  = cred->clientCertificate.length;
 460
 461             eapPeerConfig->client_cert = (unsigned char *)"blob://private-key";
 462             configBlobs[CONFIG_BLOB_PRIVATE_KEY].data = cred->clientCertificate.value;
 463             configBlobs[CONFIG_BLOB_PRIVATE_KEY].len  = cred->privateKey.length;
 464         } else {
 465             eapPeerConfig->client_cert = (unsigned char *)cred->clientCertificate.value;
 466             eapPeerConfig->private_key = (unsigned char *)cred->privateKey.value;
 467         }
 468         eapPeerConfig->private_key_passwd = (unsigned char *)cred->password.value;
 469     }
 470
 471     *minor = 0;
 472     return GSS_S_COMPLETE;
 473 }
 474
 475 static OM_uint32
 476 peerConfigFree(OM_uint32 *minor,
 477                gss_ctx_id_t ctx)
 478 {
 479     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 480
 481     if (eapPeerConfig->identity != NULL) {
 482         GSSEAP_FREE(eapPeerConfig->identity);
 483         eapPeerConfig->identity = NULL;
 484         eapPeerConfig->identity_len = 0;
 485     }
 486
 487     if (eapPeerConfig->anonymous_identity != NULL) {
 488         GSSEAP_FREE(eapPeerConfig->anonymous_identity);
 489         eapPeerConfig->anonymous_identity = NULL;
 490         eapPeerConfig->anonymous_identity_len = 0;
 491     }
 492
 493     *minor = 0;
 494     return GSS_S_COMPLETE;
 495 }
 496
 497 /*
 498  * Mark an initiator context as ready for cryptographic operations
 499  */
 500 static OM_uint32
 501 initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
 502 {
 503     OM_uint32 major;
 504     const unsigned char *key;
 505     size_t keyLength;
 506
 507     /* Cache encryption type derived from selected mechanism OID */
 508     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 509     if (GSS_ERROR(major))
 510         return major;
 511
 512     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 513         *minor = GSSEAP_KEY_UNAVAILABLE;
 514         return GSS_S_UNAVAILABLE;
 515     }
 516
 517     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 518
 519     if (keyLength < EAP_EMSK_LEN) {
 520         *minor = GSSEAP_KEY_TOO_SHORT;
 521         return GSS_S_UNAVAILABLE;
 522     }
 523
 524     major = gssEapDeriveRfc3961Key(minor,
 525                                    &key[EAP_EMSK_LEN / 2],
 526                                    EAP_EMSK_LEN / 2,
 527                                    ctx->encryptionType,
 528                                    &ctx->rfc3961Key);
 529        if (GSS_ERROR(major))
 530            return major;
 531
 532     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 533                                       &ctx->checksumType);
 534     if (GSS_ERROR(major))
 535         return major;
 536
 537     major = sequenceInit(minor,
 538                          &ctx->seqState,
 539                          ctx->recvSeq,
 540                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 541                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 542                          TRUE);
 543     if (GSS_ERROR(major))
 544         return major;
 545
 546     *minor = 0;
 547     return GSS_S_COMPLETE;
 548 }
 549
 550 static OM_uint32
 551 initBegin(OM_uint32 *minor,
 552           gss_ctx_id_t ctx,
 553           gss_name_t target,
 554           gss_OID mech,
 555           OM_uint32 reqFlags GSSEAP_UNUSED,
 556           OM_uint32 timeReq,
 557           gss_channel_bindings_t chanBindings GSSEAP_UNUSED)
 558 {
 559     OM_uint32 major;
 560     gss_cred_id_t cred = ctx->cred;
 561
 562     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 563
 564     if (cred->expiryTime)
 565         ctx->expiryTime = cred->expiryTime;
 566     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 567         ctx->expiryTime = 0;
 568     else
 569         ctx->expiryTime = time(NULL) + timeReq;
 570
 571     /*
 572      * The credential mutex protects its name, however we need to
 573      * explicitly lock the acceptor name (unlikely as it may be
 574      * that it has attributes set on it).
 575      */
 576     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 577     if (GSS_ERROR(major))
 578         return major;
 579
 580     if (target != GSS_C_NO_NAME) {
 581         GSSEAP_MUTEX_LOCK(&target->mutex);
 582
 583         major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 584         if (GSS_ERROR(major)) {
 585             GSSEAP_MUTEX_UNLOCK(&target->mutex);
 586             return major;
 587         }
 588
 589         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 590     }
 591
 592     major = gssEapCanonicalizeOid(minor,
 593                                   mech,
 594                                   OID_FLAG_NULL_VALID | OID_FLAG_MAP_NULL_TO_DEFAULT_MECH,
 595                                   &ctx->mechanismUsed);
 596     if (GSS_ERROR(major))
 597         return major;
 598
 599     /* If credentials were provided, check they're usable with this mech */
 600     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 601         *minor = GSSEAP_CRED_MECH_MISMATCH;
 602         return GSS_S_BAD_MECH;
 603     }
 604
 605     *minor = 0;
 606     return GSS_S_COMPLETE;
 607 }
 608
 609 static OM_uint32
 610 eapGssSmInitError(OM_uint32 *minor,
 611                   gss_cred_id_t cred GSSEAP_UNUSED,
 612                   gss_ctx_id_t ctx GSSEAP_UNUSED,
 613                   gss_name_t target GSSEAP_UNUSED,
 614                   gss_OID mech GSSEAP_UNUSED,
 615                   OM_uint32 reqFlags GSSEAP_UNUSED,
 616                   OM_uint32 timeReq GSSEAP_UNUSED,
 617                   gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 618                   gss_buffer_t inputToken,
 619                   gss_buffer_t outputToken GSSEAP_UNUSED,
 620                   OM_uint32 *smFlags GSSEAP_UNUSED)
 621 {
 622     OM_uint32 major;
 623     unsigned char *p;
 624
 625     if (inputToken->length < 8) {
 626         *minor = GSSEAP_TOK_TRUNC;
 627         return GSS_S_DEFECTIVE_TOKEN;
 628     }
 629
 630     p = (unsigned char *)inputToken->value;
 631
 632     major = load_uint32_be(&p[0]);
 633     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 634
 635     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 636         major = GSS_S_FAILURE;
 637         *minor = GSSEAP_BAD_ERROR_TOKEN;
 638     }
 639
 640     GSSEAP_ASSERT(GSS_ERROR(major));
 641
 642     return major;
 643 }
 644
 645 #ifdef GSSEAP_ENABLE_REAUTH
 646 static OM_uint32
 647 eapGssSmInitGssReauth(OM_uint32 *minor,
 648                       gss_cred_id_t cred,
 649                       gss_ctx_id_t ctx,
 650                       gss_name_t target,
 651                       gss_OID mech GSSEAP_UNUSED,
 652                       OM_uint32 reqFlags,
 653                       OM_uint32 timeReq,
 654                       gss_channel_bindings_t chanBindings,
 655                       gss_buffer_t inputToken,
 656                       gss_buffer_t outputToken,
 657                       OM_uint32 *smFlags GSSEAP_UNUSED)
 658 {
 659     OM_uint32 major, tmpMinor;
 660     gss_name_t mechTarget = GSS_C_NO_NAME;
 661     gss_OID actualMech = GSS_C_NO_OID;
 662     OM_uint32 gssFlags, timeRec;
 663
 664     /*
 665      * Here we use the passed in credential handle because the resolved
 666      * context credential does not currently have the reauth creds.
 667      */
 668     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 669         if (!gssEapCanReauthP(cred, target, timeReq))
 670             return GSS_S_CONTINUE_NEEDED;
 671
 672         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 673     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 674         major = GSS_S_DEFECTIVE_TOKEN;
 675         *minor = GSSEAP_WRONG_ITOK;
 676         goto cleanup;
 677     }
 678
 679     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 680
 681     major = gssEapMechToGlueName(minor, target, &mechTarget);
 682     if (GSS_ERROR(major))
 683         goto cleanup;
 684
 685     major = gssInitSecContext(minor,
 686                               cred->reauthCred,
 687                               &ctx->reauthCtx,
 688                               mechTarget,
 689                               (gss_OID)gss_mech_krb5,
 690                               reqFlags | GSS_C_MUTUAL_FLAG,
 691                               timeReq,
 692                               chanBindings,
 693                               inputToken,
 694                               &actualMech,
 695                               outputToken,
 696                               &gssFlags,
 697                               &timeRec);
 698     if (GSS_ERROR(major))
 699         goto cleanup;
 700
 701     ctx->gssFlags = gssFlags;
 702
 703     if (major == GSS_S_COMPLETE) {
 704         GSSEAP_ASSERT(GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE);
 705
 706         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 707         if (GSS_ERROR(major))
 708             goto cleanup;
 709         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 710     } else {
 711         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 712     }
 713
 714 cleanup:
 715     gssReleaseName(&tmpMinor, &mechTarget);
 716
 717     return major;
 718 }
 719 #endif /* GSSEAP_ENABLE_REAUTH */
 720
 721 #ifdef GSSEAP_DEBUG
 722 static OM_uint32
 723 eapGssSmInitVendorInfo(OM_uint32 *minor,
 724                        gss_cred_id_t cred GSSEAP_UNUSED,
 725                        gss_ctx_id_t ctx GSSEAP_UNUSED,
 726                        gss_name_t target GSSEAP_UNUSED,
 727                        gss_OID mech GSSEAP_UNUSED,
 728                        OM_uint32 reqFlags GSSEAP_UNUSED,
 729                        OM_uint32 timeReq GSSEAP_UNUSED,
 730                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 731                        gss_buffer_t inputToken GSSEAP_UNUSED,
 732                        gss_buffer_t outputToken,
 733                        OM_uint32 *smFlags GSSEAP_UNUSED)
 734 {
 735     OM_uint32 major;
 736
 737     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 738     if (GSS_ERROR(major))
 739         return major;
 740
 741     return GSS_S_CONTINUE_NEEDED;
 742 }
 743 #endif
 744
 745 static OM_uint32
 746 eapGssSmInitAcceptorName(OM_uint32 *minor,
 747                          gss_cred_id_t cred GSSEAP_UNUSED,
 748                          gss_ctx_id_t ctx,
 749                          gss_name_t target GSSEAP_UNUSED,
 750                          gss_OID mech GSSEAP_UNUSED,
 751                          OM_uint32 reqFlags GSSEAP_UNUSED,
 752                          OM_uint32 timeReq GSSEAP_UNUSED,
 753                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 754                          gss_buffer_t inputToken GSSEAP_UNUSED,
 755                          gss_buffer_t outputToken,
 756                          OM_uint32 *smFlags GSSEAP_UNUSED)
 757 {
 758     OM_uint32 major;
 759
 760     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 761         ctx->acceptorName != GSS_C_NO_NAME) {
 762
 763         /* Send desired target name to acceptor */
 764         major = gssEapDisplayName(minor, ctx->acceptorName,
 765                                   outputToken, NULL);
 766         if (GSS_ERROR(major))
 767             return major;
 768     } else if (inputToken != GSS_C_NO_BUFFER) {
 769         OM_uint32 tmpMinor;
 770         gss_name_t nameHint;
 771         int equal;
 772
 773         /* Accept target name hint from acceptor or verify acceptor */
 774         major = gssEapImportName(minor, inputToken,
 775                                  GSS_C_NT_USER_NAME,
 776                                  ctx->mechanismUsed,
 777                                  &nameHint);
 778         if (GSS_ERROR(major))
 779             return major;
 780
 781         if (ctx->acceptorName != GSS_C_NO_NAME) {
 782             /* verify name hint matched asserted acceptor name  */
 783             major = gssEapCompareName(minor,
 784                                       nameHint,
 785                                       ctx->acceptorName,
 786                                       COMPARE_NAME_FLAG_IGNORE_EMPTY_REALMS,
 787                                       &equal);
 788             if (GSS_ERROR(major)) {
 789                 gssEapReleaseName(&tmpMinor, &nameHint);
 790                 return major;
 791             }
 792
 793             gssEapReleaseName(&tmpMinor, &nameHint);
 794
 795             if (!equal) {
 796                 *minor = GSSEAP_WRONG_ACCEPTOR_NAME;
 797                 return GSS_S_DEFECTIVE_TOKEN;
 798             }
 799         } else { /* acceptor name is no_name */
 800             /* accept acceptor name hint */
 801             ctx->acceptorName = nameHint;
 802             nameHint = GSS_C_NO_NAME;
 803         }
 804     }
 805
 806
 807     /*
 808      * Currently, other parts of the code assume that the acceptor name
 809      * is available, hence this check.
 810      */
 811     if (ctx->acceptorName == GSS_C_NO_NAME) {
 812         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 813         return GSS_S_FAILURE;
 814     }
 815
 816     /*
 817      * Generate channel binding data
 818      */
 819     if (ctx->initiatorCtx.chbindData == NULL) {
 820         major = peerInitEapChannelBinding(minor, ctx);
 821         if (GSS_ERROR(major))
 822             return major;
 823     }
 824
 825     return GSS_S_CONTINUE_NEEDED;
 826 }
 827
 828 static OM_uint32
 829 eapGssSmInitIdentity(OM_uint32 *minor,
 830                      gss_cred_id_t cred GSSEAP_UNUSED,
 831                      gss_ctx_id_t ctx,
 832                      gss_name_t target GSSEAP_UNUSED,
 833                      gss_OID mech GSSEAP_UNUSED,
 834                      OM_uint32 reqFlags GSSEAP_UNUSED,
 835                      OM_uint32 timeReq GSSEAP_UNUSED,
 836                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 837                      gss_buffer_t inputToken GSSEAP_UNUSED,
 838                      gss_buffer_t outputToken GSSEAP_UNUSED,
 839                      OM_uint32 *smFlags)
 840 {
 841     struct eap_config eapConfig;
 842
 843 #ifdef GSSEAP_ENABLE_REAUTH
 844     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 845         OM_uint32 tmpMinor;
 846
 847         /* server didn't support reauthentication, sent EAP request */
 848         gssDeleteSecContext(&tmpMinor, &ctx->reauthCtx, GSS_C_NO_BUFFER);
 849         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 850         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 851     } else
 852 #endif
 853         *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 854
 855     GSSEAP_ASSERT((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 856     GSSEAP_ASSERT(inputToken == GSS_C_NO_BUFFER);
 857
 858     memset(&eapConfig, 0, sizeof(eapConfig));
 859
 860     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 861                                              &gssEapPolicyCallbacks,
 862                                              ctx,
 863                                              &eapConfig);
 864     if (ctx->initiatorCtx.eap == NULL) {
 865         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 866         return GSS_S_FAILURE;
 867     }
 868
 869     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 870
 871     /* poke EAP state machine */
 872     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 873         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 874         return GSS_S_FAILURE;
 875     }
 876
 877     GSSEAP_SM_TRANSITION_NEXT(ctx);
 878
 879     *minor = 0;
 880
 881     return GSS_S_CONTINUE_NEEDED;
 882 }
 883
 884 static OM_uint32
 885 eapGssSmInitAuthenticate(OM_uint32 *minor,
 886                          gss_cred_id_t cred GSSEAP_UNUSED,
 887                          gss_ctx_id_t ctx,
 888                          gss_name_t target GSSEAP_UNUSED,
 889                          gss_OID mech GSSEAP_UNUSED,
 890                          OM_uint32 reqFlags GSSEAP_UNUSED,
 891                          OM_uint32 timeReq GSSEAP_UNUSED,
 892                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 893                          gss_buffer_t inputToken GSSEAP_UNUSED,
 894                          gss_buffer_t outputToken,
 895                          OM_uint32 *smFlags)
 896 {
 897     OM_uint32 major;
 898     OM_uint32 tmpMinor;
 899     struct wpabuf *resp = NULL;
 900
 901     *minor = 0;
 902
 903     GSSEAP_ASSERT(inputToken != GSS_C_NO_BUFFER);
 904
 905     major = peerConfigInit(minor, ctx);
 906     if (GSS_ERROR(major))
 907         goto cleanup;
 908
 909     GSSEAP_ASSERT(ctx->initiatorCtx.eap != NULL);
 910     GSSEAP_ASSERT(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 911
 912     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 913
 914     wpabuf_set(&ctx->initiatorCtx.reqData,
 915                inputToken->value, inputToken->length);
 916
 917     major = GSS_S_CONTINUE_NEEDED;
 918
 919     eap_peer_sm_step(ctx->initiatorCtx.eap);
 920     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 921         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 922
 923         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 924     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 925         major = initReady(minor, ctx);
 926         if (GSS_ERROR(major))
 927             goto cleanup;
 928
 929         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 930         major = GSS_S_CONTINUE_NEEDED;
 931         GSSEAP_SM_TRANSITION_NEXT(ctx);
 932     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 933         major = GSS_S_DEFECTIVE_CREDENTIAL;
 934         *minor = GSSEAP_PEER_AUTH_FAILURE;
 935     } else {
 936         major = GSS_S_DEFECTIVE_TOKEN;
 937         *minor = GSSEAP_PEER_BAD_MESSAGE;
 938     }
 939
 940 cleanup:
 941     if (resp != NULL) {
 942         OM_uint32 tmpMajor;
 943         gss_buffer_desc respBuf;
 944
 945         GSSEAP_ASSERT(major == GSS_S_CONTINUE_NEEDED);
 946
 947         respBuf.length = wpabuf_len(resp);
 948         respBuf.value = (void *)wpabuf_head(resp);
 949
 950         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 951         if (GSS_ERROR(tmpMajor)) {
 952             major = tmpMajor;
 953             *minor = tmpMinor;
 954         }
 955
 956         *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 957     }
 958
 959     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 960     peerConfigFree(&tmpMinor, ctx);
 961
 962     return major;
 963 }
 964
 965 static OM_uint32
 966 eapGssSmInitGssFlags(OM_uint32 *minor,
 967                      gss_cred_id_t cred GSSEAP_UNUSED,
 968                      gss_ctx_id_t ctx,
 969                      gss_name_t target GSSEAP_UNUSED,
 970                      gss_OID mech GSSEAP_UNUSED,
 971                      OM_uint32 reqFlags GSSEAP_UNUSED,
 972                      OM_uint32 timeReq GSSEAP_UNUSED,
 973                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 974                      gss_buffer_t inputToken GSSEAP_UNUSED,
 975                      gss_buffer_t outputToken,
 976                      OM_uint32 *smFlags GSSEAP_UNUSED)
 977 {
 978     unsigned char wireFlags[4];
 979     gss_buffer_desc flagsBuf;
 980
 981     /*
 982      * As a temporary measure, force mutual authentication until channel binding is
 983      * more widely deployed.
 984      */
 985     ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 986     store_uint32_be(ctx->gssFlags & GSSEAP_WIRE_FLAGS_MASK, wireFlags);
 987
 988     flagsBuf.length = sizeof(wireFlags);
 989     flagsBuf.value = wireFlags;
 990
 991     return duplicateBuffer(minor, &flagsBuf, outputToken);
 992 }
 993
 994 static OM_uint32
 995 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 996                                gss_cred_id_t cred GSSEAP_UNUSED,
 997                                gss_ctx_id_t ctx,
 998                                gss_name_t target GSSEAP_UNUSED,
 999                                gss_OID mech GSSEAP_UNUSED,
1000                                OM_uint32 reqFlags GSSEAP_UNUSED,
1001                                OM_uint32 timeReq GSSEAP_UNUSED,
1002                                gss_channel_bindings_t chanBindings,
1003                                gss_buffer_t inputToken GSSEAP_UNUSED,
1004                                gss_buffer_t outputToken,
1005                                OM_uint32 *smFlags)
1006 {
1007     OM_uint32 major;
1008     krb5_error_code code;
1009     krb5_context krbContext;
1010     krb5_data data;
1011     krb5_checksum cksum;
1012     gss_buffer_desc cksumBuffer;
1013
1014     if (chanBindings == GSS_C_NO_CHANNEL_BINDINGS ||
1015         chanBindings->application_data.length == 0)
1016         return GSS_S_CONTINUE_NEEDED;
1017
1018     GSSEAP_KRB_INIT(&krbContext);
1019
1020     KRB_DATA_INIT(&data);
1021
1022     gssBufferToKrbData(&chanBindings->application_data, &data);
1023
1024     code = krb5_c_make_checksum(krbContext, ctx->checksumType,
1025                                 &ctx->rfc3961Key,
1026                                 KEY_USAGE_GSSEAP_CHBIND_MIC,
1027                                 &data, &cksum);
1028     if (code != 0) {
1029         *minor = code;
1030         return GSS_S_FAILURE;
1031     }
1032
1033     cksumBuffer.length = KRB_CHECKSUM_LENGTH(&cksum);
1034     cksumBuffer.value  = KRB_CHECKSUM_DATA(&cksum);
1035
1036     major = duplicateBuffer(minor, &cksumBuffer, outputToken);
1037     if (GSS_ERROR(major)) {
1038         krb5_free_checksum_contents(krbContext, &cksum);
1039         return major;
1040     }
1041
1042     *minor = 0;
1043     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
1044
1045     krb5_free_checksum_contents(krbContext, &cksum);
1046
1047     return GSS_S_CONTINUE_NEEDED;
1048 }
1049
1050 static OM_uint32
1051 eapGssSmInitInitiatorMIC(OM_uint32 *minor,
1052                          gss_cred_id_t cred GSSEAP_UNUSED,
1053                          gss_ctx_id_t ctx,
1054                          gss_name_t target GSSEAP_UNUSED,
1055                          gss_OID mech GSSEAP_UNUSED,
1056                          OM_uint32 reqFlags GSSEAP_UNUSED,
1057                          OM_uint32 timeReq GSSEAP_UNUSED,
1058                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
1059                          gss_buffer_t inputToken GSSEAP_UNUSED,
1060                          gss_buffer_t outputToken,
1061                          OM_uint32 *smFlags)
1062 {
1063     OM_uint32 major;
1064
1065     major = gssEapMakeTokenMIC(minor, ctx, outputToken);
1066     if (GSS_ERROR(major))
1067         return major;
1068
1069     GSSEAP_SM_TRANSITION_NEXT(ctx);
1070
1071     *minor = 0;
1072     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
1073
1074     return GSS_S_CONTINUE_NEEDED;
1075 }
1076
1077 #ifdef GSSEAP_ENABLE_REAUTH
1078 static OM_uint32
1079 eapGssSmInitReauthCreds(OM_uint32 *minor,
1080                         gss_cred_id_t cred,
1081                         gss_ctx_id_t ctx,
1082                         gss_name_t target GSSEAP_UNUSED,
1083                         gss_OID mech GSSEAP_UNUSED,
1084                         OM_uint32 reqFlags GSSEAP_UNUSED,
1085                         OM_uint32 timeReq GSSEAP_UNUSED,
1086                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
1087                         gss_buffer_t inputToken,
1088                         gss_buffer_t outputToken GSSEAP_UNUSED,
1089                         OM_uint32 *smFlags GSSEAP_UNUSED)
1090 {
1091     OM_uint32 major;
1092
1093     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
1094         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
1095         if (GSS_ERROR(major))
1096             return major;
1097     }
1098
1099     *minor = 0;
1100     return GSS_S_CONTINUE_NEEDED;
1101 }
1102 #endif /* GSSEAP_ENABLE_REAUTH */
1103
1104 static OM_uint32
1105 eapGssSmInitAcceptorMIC(OM_uint32 *minor,
1106                         gss_cred_id_t cred GSSEAP_UNUSED,
1107                         gss_ctx_id_t ctx,
1108                         gss_name_t target GSSEAP_UNUSED,
1109                         gss_OID mech GSSEAP_UNUSED,
1110                         OM_uint32 reqFlags GSSEAP_UNUSED,
1111                         OM_uint32 timeReq GSSEAP_UNUSED,
1112                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
1113                         gss_buffer_t inputToken,
1114                         gss_buffer_t outputToken GSSEAP_UNUSED,
1115                         OM_uint32 *smFlags GSSEAP_UNUSED)
1116 {
1117     OM_uint32 major;
1118
1119     major = gssEapVerifyTokenMIC(minor, ctx, inputToken);
1120     if (GSS_ERROR(major))
1121         return major;
1122
1123     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
1124
1125     *minor = 0;
1126
1127     return GSS_S_COMPLETE;
1128 }
1129
1130 static struct gss_eap_sm eapGssInitiatorSm[] = {
1131     {
1132         ITOK_TYPE_CONTEXT_ERR,
1133         ITOK_TYPE_NONE,
1134         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
1135         0,
1136         eapGssSmInitError
1137     },
1138     {
1139         ITOK_TYPE_ACCEPTOR_NAME_RESP,
1140         ITOK_TYPE_ACCEPTOR_NAME_REQ,
1141         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE |
1142         GSSEAP_STATE_ACCEPTOR_EXTS,
1143         0,
1144         eapGssSmInitAcceptorName
1145     },
1146 #ifdef GSSEAP_DEBUG
1147     {
1148         ITOK_TYPE_NONE,
1149         ITOK_TYPE_VENDOR_INFO,
1150         GSSEAP_STATE_INITIAL,
1151         0,
1152         eapGssSmInitVendorInfo
1153     },
1154 #endif
1155 #ifdef GSSEAP_ENABLE_REAUTH
1156     {
1157         ITOK_TYPE_REAUTH_RESP,
1158         ITOK_TYPE_REAUTH_REQ,
1159         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
1160         0,
1161         eapGssSmInitGssReauth
1162     },
1163 #endif
1164     {
1165         ITOK_TYPE_NONE,
1166         ITOK_TYPE_NONE,
1167 #ifdef GSSEAP_ENABLE_REAUTH
1168         GSSEAP_STATE_REAUTHENTICATE |
1169 #endif
1170         GSSEAP_STATE_INITIAL,
1171         SM_ITOK_FLAG_REQUIRED,
1172         eapGssSmInitIdentity
1173     },
1174     {
1175         ITOK_TYPE_EAP_REQ,
1176         ITOK_TYPE_EAP_RESP,
1177         GSSEAP_STATE_AUTHENTICATE,
1178         SM_ITOK_FLAG_REQUIRED,
1179         eapGssSmInitAuthenticate
1180     },
1181     {
1182         ITOK_TYPE_NONE,
1183         ITOK_TYPE_GSS_FLAGS,
1184         GSSEAP_STATE_INITIATOR_EXTS,
1185         0,
1186         eapGssSmInitGssFlags
1187     },
1188     {
1189         ITOK_TYPE_NONE,
1190         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
1191         GSSEAP_STATE_INITIATOR_EXTS,
1192         0,
1193         eapGssSmInitGssChannelBindings
1194     },
1195     {
1196         ITOK_TYPE_NONE,
1197         ITOK_TYPE_INITIATOR_MIC,
1198         GSSEAP_STATE_INITIATOR_EXTS,
1199         SM_ITOK_FLAG_REQUIRED,
1200         eapGssSmInitInitiatorMIC
1201     },
1202 #ifdef GSSEAP_ENABLE_REAUTH
1203     {
1204         ITOK_TYPE_REAUTH_CREDS,
1205         ITOK_TYPE_NONE,
1206         GSSEAP_STATE_ACCEPTOR_EXTS,
1207         0,
1208         eapGssSmInitReauthCreds
1209     },
1210 #endif
1211     /* other extensions go here */
1212     {
1213         ITOK_TYPE_ACCEPTOR_MIC,
1214         ITOK_TYPE_NONE,
1215         GSSEAP_STATE_ACCEPTOR_EXTS,
1216         SM_ITOK_FLAG_REQUIRED,
1217         eapGssSmInitAcceptorMIC
1218     }
1219 };
1220
1221 OM_uint32
1222 gssEapInitSecContext(OM_uint32 *minor,
1223                      gss_cred_id_t cred,
1224                      gss_ctx_id_t ctx,
1225                      gss_name_t target_name,
1226                      gss_OID mech_type,
1227                      OM_uint32 req_flags,
1228                      OM_uint32 time_req,
1229                      gss_channel_bindings_t input_chan_bindings,
1230                      gss_buffer_t input_token,
1231                      gss_OID *actual_mech_type,
1232                      gss_buffer_t output_token,
1233                      OM_uint32 *ret_flags,
1234                      OM_uint32 *time_rec)
1235 {
1236     OM_uint32 major, tmpMinor;
1237     int initialContextToken = (ctx->mechanismUsed == GSS_C_NO_OID);
1238
1239     /*
1240      * XXX is acquiring the credential lock here necessary? The password is
1241      * mutable but the contract could specify that this is not updated whilst
1242      * a context is being initialized.
1243      */
1244     if (cred != GSS_C_NO_CREDENTIAL)
1245         GSSEAP_MUTEX_LOCK(&cred->mutex);
1246
1247     if (ctx->cred == GSS_C_NO_CREDENTIAL) {
1248         major = gssEapResolveInitiatorCred(minor, cred, target_name, &ctx->cred);
1249         if (GSS_ERROR(major))
1250             goto cleanup;
1251
1252         GSSEAP_ASSERT(ctx->cred != GSS_C_NO_CREDENTIAL);
1253     }
1254
1255     GSSEAP_MUTEX_LOCK(&ctx->cred->mutex);
1256
1257     GSSEAP_ASSERT(ctx->cred->flags & CRED_FLAG_RESOLVED);
1258     GSSEAP_ASSERT(ctx->cred->flags & CRED_FLAG_INITIATE);
1259
1260     if (initialContextToken) {
1261         major = initBegin(minor, ctx, target_name, mech_type,
1262                           req_flags, time_req, input_chan_bindings);
1263         if (GSS_ERROR(major))
1264             goto cleanup;
1265     }
1266
1267     major = gssEapSmStep(minor,
1268                          cred,
1269                          ctx,
1270                          target_name,
1271                          mech_type,
1272                          req_flags,
1273                          time_req,
1274                          input_chan_bindings,
1275                          input_token,
1276                          output_token,
1277                          eapGssInitiatorSm,
1278                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
1279     if (GSS_ERROR(major))
1280         goto cleanup;
1281
1282     if (actual_mech_type != NULL) {
1283         OM_uint32 tmpMajor;
1284
1285         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, actual_mech_type);
1286         if (GSS_ERROR(tmpMajor)) {
1287             major = tmpMajor;
1288             *minor = tmpMinor;
1289             goto cleanup;
1290         }
1291     }
1292
1293     if (ret_flags != NULL)
1294         *ret_flags = ctx->gssFlags;
1295
1296     if (time_rec != NULL)
1297         gssEapContextTime(&tmpMinor, ctx, time_rec);
1298
1299     GSSEAP_ASSERT(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1300
1301 cleanup:
1302     if (cred != GSS_C_NO_CREDENTIAL)
1303         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1304     if (ctx->cred != GSS_C_NO_CREDENTIAL)
1305         GSSEAP_MUTEX_UNLOCK(&ctx->cred->mutex);
1306
1307     return major;
1308 }
1309
1310 OM_uint32 GSSAPI_CALLCONV
1311 gss_init_sec_context(OM_uint32 *minor,
1312                      gss_cred_id_t cred,
1313                      gss_ctx_id_t *context_handle,
1314                      gss_name_t target_name,
1315                      gss_OID mech_type,
1316                      OM_uint32 req_flags,
1317                      OM_uint32 time_req,
1318                      gss_channel_bindings_t input_chan_bindings,
1319                      gss_buffer_t input_token,
1320                      gss_OID *actual_mech_type,
1321                      gss_buffer_t output_token,
1322                      OM_uint32 *ret_flags,
1323                      OM_uint32 *time_rec)
1324 {
1325     OM_uint32 major, tmpMinor;
1326     gss_ctx_id_t ctx = *context_handle;
1327
1328     *minor = 0;
1329
1330     output_token->length = 0;
1331     output_token->value = NULL;
1332
1333     if (ctx == GSS_C_NO_CONTEXT) {
1334         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
1335             *minor = GSSEAP_WRONG_SIZE;
1336             return GSS_S_DEFECTIVE_TOKEN;
1337         }
1338
1339         major = gssEapAllocContext(minor, &ctx);
1340         if (GSS_ERROR(major))
1341             return major;
1342
1343         ctx->flags |= CTX_FLAG_INITIATOR;
1344
1345         *context_handle = ctx;
1346     }
1347
1348     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1349
1350     major = gssEapInitSecContext(minor,
1351                                  cred,
1352                                  ctx,
1353                                  target_name,
1354                                  mech_type,
1355                                  req_flags,
1356                                  time_req,
1357                                  input_chan_bindings,
1358                                  input_token,
1359                                  actual_mech_type,
1360                                  output_token,
1361                                  ret_flags,
1362                                  time_rec);
1363
1364     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1365
1366     if (GSS_ERROR(major))
1367         gssEapReleaseContext(&tmpMinor, context_handle);
1368
1369     return major;
1370 }