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