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