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