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