mech_eap/init_sec_context.c

   1 /*
   2  * Copyright (c) 2011, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Establish a security context on the initiator (client). These functions
  35  * wrap around libeap.
  36  */
  37
  38 #include "gssapiP_eap.h"
  39 #include "radius/radius.h"
  40 #include "util_radius.h"
  41 #include "utils/radius_utils.h"
  42
  43 /* methods allowed for phase1 authentication*/
  44 static const struct eap_method_type allowed_eap_method_types[] = {
  45     {EAP_VENDOR_IETF, EAP_TYPE_TTLS},
  46     {EAP_VENDOR_IETF, EAP_TYPE_NONE}};
  47
  48 static OM_uint32
  49 policyVariableToFlag(enum eapol_bool_var variable)
  50 {
  51     OM_uint32 flag = 0;
  52
  53     switch (variable) {
  54     case EAPOL_eapSuccess:
  55         flag = CTX_FLAG_EAP_SUCCESS;
  56         break;
  57     case EAPOL_eapRestart:
  58         flag = CTX_FLAG_EAP_RESTART;
  59         break;
  60     case EAPOL_eapFail:
  61         flag = CTX_FLAG_EAP_FAIL;
  62         break;
  63     case EAPOL_eapResp:
  64         flag = CTX_FLAG_EAP_RESP;
  65         break;
  66     case EAPOL_eapNoResp:
  67         flag = CTX_FLAG_EAP_NO_RESP;
  68         break;
  69     case EAPOL_eapReq:
  70         flag = CTX_FLAG_EAP_REQ;
  71         break;
  72     case EAPOL_portEnabled:
  73         flag = CTX_FLAG_EAP_PORT_ENABLED;
  74         break;
  75     case EAPOL_altAccept:
  76         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  77         break;
  78     case EAPOL_altReject:
  79         flag = CTX_FLAG_EAP_ALT_REJECT;
  80         break;
  81     }
  82
  83     return flag;
  84 }
  85
  86 static struct eap_peer_config *
  87 peerGetConfig(void *ctx)
  88 {
  89     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  90
  91     return &gssCtx->initiatorCtx.eapPeerConfig;
  92 }
  93
  94 static Boolean
  95 peerGetBool(void *data, enum eapol_bool_var variable)
  96 {
  97     gss_ctx_id_t ctx = data;
  98     OM_uint32 flag;
  99
 100     if (ctx == GSS_C_NO_CONTEXT)
 101         return FALSE;
 102
 103     flag = policyVariableToFlag(variable);
 104
 105     return ((ctx->flags & flag) != 0);
 106 }
 107
 108 static void
 109 peerSetBool(void *data, enum eapol_bool_var variable,
 110             Boolean value)
 111 {
 112     gss_ctx_id_t ctx = data;
 113     OM_uint32 flag;
 114
 115     if (ctx == GSS_C_NO_CONTEXT)
 116         return;
 117
 118     flag = policyVariableToFlag(variable);
 119
 120     if (value)
 121         ctx->flags |= flag;
 122     else
 123         ctx->flags &= ~(flag);
 124 }
 125
 126 static unsigned int
 127 peerGetInt(void *data, enum eapol_int_var variable)
 128 {
 129     gss_ctx_id_t ctx = data;
 130
 131     if (ctx == GSS_C_NO_CONTEXT)
 132         return FALSE;
 133
 134     GSSEAP_ASSERT(CTX_IS_INITIATOR(ctx));
 135
 136     switch (variable) {
 137     case EAPOL_idleWhile:
 138         return ctx->initiatorCtx.idleWhile;
 139         break;
 140     }
 141
 142     return 0;
 143 }
 144
 145 static void
 146 peerSetInt(void *data, enum eapol_int_var variable,
 147            unsigned int value)
 148 {
 149     gss_ctx_id_t ctx = data;
 150
 151     if (ctx == GSS_C_NO_CONTEXT)
 152         return;
 153
 154     GSSEAP_ASSERT(CTX_IS_INITIATOR(ctx));
 155
 156     switch (variable) {
 157     case EAPOL_idleWhile:
 158         ctx->initiatorCtx.idleWhile = value;
 159         break;
 160     }
 161 }
 162
 163 static struct wpabuf *
 164 peerGetEapReqData(void *ctx)
 165 {
 166     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 167
 168     return &gssCtx->initiatorCtx.reqData;
 169 }
 170
 171 static void
 172 peerSetConfigBlob(void *ctx GSSEAP_UNUSED,
 173                   struct wpa_config_blob *blob GSSEAP_UNUSED)
 174 {
 175 }
 176
 177 static const struct wpa_config_blob *
 178 peerGetConfigBlob(void *ctx,
 179                   const char *name)
 180 {
 181     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 182     size_t index;
 183
 184     if (strcmp(name, "client-cert") == 0)
 185         index = CONFIG_BLOB_CLIENT_CERT;
 186     else if (strcmp(name, "private-key") == 0)
 187         index = CONFIG_BLOB_PRIVATE_KEY;
 188     else if (strcmp(name, "ca-cert") == 0)
 189         index = CONFIG_BLOB_CA_CERT;
 190     else
 191         return NULL;
 192
 193     return &gssCtx->initiatorCtx.configBlobs[index];
 194 }
 195
 196 static void
 197 peerNotifyPending(void *ctx GSSEAP_UNUSED)
 198 {
 199 }
 200
 201 static struct eapol_callbacks gssEapPolicyCallbacks = {
 202     peerGetConfig,
 203     peerGetBool,
 204     peerSetBool,
 205     peerGetInt,
 206     peerSetInt,
 207     peerGetEapReqData,
 208     peerSetConfigBlob,
 209     peerGetConfigBlob,
 210     peerNotifyPending,
 211 };
 212
 213 #ifdef GSSEAP_DEBUG
 214 extern int wpa_debug_level;
 215 #endif
 216
 217 #define CHBIND_SERVICE_NAME_FLAG        0x01
 218 #define CHBIND_HOST_NAME_FLAG           0x02
 219 #define CHBIND_SERVICE_SPECIFIC_FLAG    0x04
 220 #define CHBIND_REALM_NAME_FLAG          0x08
 221
 222 static OM_uint32
 223 peerInitEapChannelBinding(OM_uint32 *minor, gss_ctx_id_t ctx)
 224 {
 225     struct wpabuf *buf = NULL;
 226     unsigned int chbindReqFlags = 0;
 227     krb5_principal princ = NULL;
 228     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 229     OM_uint32 major = GSS_S_COMPLETE;
 230     krb5_context krbContext = NULL;
 231
 232     /* XXX is this check redundant? */
 233     if (ctx->acceptorName == GSS_C_NO_NAME) {
 234         major = GSS_S_BAD_NAME;
 235         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 236         goto cleanup;
 237     }
 238
 239     princ = ctx->acceptorName->krbPrincipal;
 240
 241     krbPrincComponentToGssBuffer(princ, 0, &nameBuf);
 242     if (nameBuf.length > 0) {
 243         major = gssEapRadiusAddAttr(minor, &buf, PW_GSS_ACCEPTOR_SERVICE_NAME,
 244                                     0, &nameBuf);
 245         if (GSS_ERROR(major))
 246             goto cleanup;
 247
 248         chbindReqFlags |= CHBIND_SERVICE_NAME_FLAG;
 249     }
 250
 251     krbPrincComponentToGssBuffer(princ, 1, &nameBuf);
 252     if (nameBuf.length > 0) {
 253         major = gssEapRadiusAddAttr(minor, &buf, PW_GSS_ACCEPTOR_HOST_NAME,
 254                                     0, &nameBuf);
 255         if (GSS_ERROR(major))
 256             goto cleanup;
 257
 258         chbindReqFlags |= CHBIND_HOST_NAME_FLAG;
 259     }
 260
 261     GSSEAP_KRB_INIT(&krbContext);
 262
 263     *minor = krbPrincUnparseServiceSpecifics(krbContext, princ, &nameBuf);
 264     if (*minor != 0)
 265         goto cleanup;
 266
 267     if (nameBuf.length > 0) {
 268         major = gssEapRadiusAddAttr(minor, &buf,
 269                                     PW_GSS_ACCEPTOR_SERVICE_SPECIFICS,
 270                                     0, &nameBuf);
 271         if (GSS_ERROR(major))
 272             goto cleanup;
 273
 274         chbindReqFlags |= CHBIND_SERVICE_SPECIFIC_FLAG;
 275     }
 276
 277     krbFreeUnparsedName(krbContext, &nameBuf);
 278     krbPrincRealmToGssBuffer(princ, &nameBuf);
 279
 280     if (nameBuf.length > 0) {
 281         major = gssEapRadiusAddAttr(minor, &buf,
 282                                     PW_GSS_ACCEPTOR_REALM_NAME,
 283                                     0, &nameBuf);
 284         if (GSS_ERROR(major))
 285             goto cleanup;
 286
 287         chbindReqFlags |= CHBIND_REALM_NAME_FLAG;
 288     }
 289
 290     if (chbindReqFlags == 0) {
 291         major = GSS_S_BAD_NAME;
 292         *minor = GSSEAP_BAD_ACCEPTOR_NAME;
 293         goto cleanup;
 294     }
 295
 296     ctx->initiatorCtx.chbindData = buf;
 297     ctx->initiatorCtx.chbindReqFlags = chbindReqFlags;
 298
 299     buf = NULL;
 300
 301     major = GSS_S_COMPLETE;
 302     *minor = 0;
 303
 304 cleanup:
 305     /*namebuf is freed when used and may be left with a unowned pointer*/
 306     wpabuf_free(buf);
 307
 308     return major;
 309 }
 310
 311 static void
 312 peerProcessChbindResponse(void *context, int code, int nsid,
 313                           u8 *data, size_t len)
 314 {
 315     radius_parser msg;
 316     gss_ctx_id_t ctx = (gss_ctx_id_t )context;
 317     void *vsadata;
 318     u8 type;
 319     u32 vendor_id;
 320     u32 chbindRetFlags = 0;
 321     size_t vsadata_len;
 322
 323     if (nsid != CHBIND_NSID_RADIUS)
 324         return;
 325
 326     if (data == NULL)
 327         return;
 328     msg = radius_parser_start(data, len);
 329     if (msg == NULL)
 330         return;
 331
 332     while (radius_parser_parse_tlv(msg, &type, &vendor_id, &vsadata,
 333                                    &vsadata_len) == 0) {
 334         switch (type) {
 335         case PW_GSS_ACCEPTOR_SERVICE_NAME:
 336             chbindRetFlags |= CHBIND_SERVICE_NAME_FLAG;
 337             break;
 338         case PW_GSS_ACCEPTOR_HOST_NAME:
 339             chbindRetFlags |= CHBIND_HOST_NAME_FLAG;
 340             break;
 341         case PW_GSS_ACCEPTOR_SERVICE_SPECIFICS:
 342             chbindRetFlags |= CHBIND_SERVICE_SPECIFIC_FLAG;
 343             break;
 344         case PW_GSS_ACCEPTOR_REALM_NAME:
 345             chbindRetFlags |= CHBIND_REALM_NAME_FLAG;
 346             break;
 347         }
 348     }
 349
 350     radius_parser_finish(msg);
 351
 352     if (code == CHBIND_CODE_SUCCESS &&
 353         ((chbindRetFlags & ctx->initiatorCtx.chbindReqFlags) == ctx->initiatorCtx.chbindReqFlags)) {
 354         ctx->flags |= CTX_FLAG_EAP_CHBIND_ACCEPT;
 355         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 356     } /* else log failures? */
 357 }
 358
 359 static OM_uint32
 360 peerConfigInit(OM_uint32 *minor, gss_ctx_id_t ctx)
 361 {
 362     OM_uint32 major;
 363     krb5_context krbContext;
 364     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 365     struct wpa_config_blob *configBlobs = ctx->initiatorCtx.configBlobs;
 366     gss_buffer_desc identity = GSS_C_EMPTY_BUFFER;
 367     gss_buffer_desc realm = GSS_C_EMPTY_BUFFER;
 368     gss_cred_id_t cred = ctx->cred;
 369
 370     eapPeerConfig->identity = NULL;
 371     eapPeerConfig->identity_len = 0;
 372     eapPeerConfig->anonymous_identity = NULL;
 373     eapPeerConfig->anonymous_identity_len = 0;
 374     eapPeerConfig->password = NULL;
 375     eapPeerConfig->password_len = 0;
 376     eapPeerConfig->eap_methods = (struct eap_method_type *) allowed_eap_method_types;
 377
 378     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 379
 380     GSSEAP_KRB_INIT(&krbContext);
 381
 382     eapPeerConfig->fragment_size = 1024;
 383 #ifdef GSSEAP_DEBUG
 384     wpa_debug_level = 0;
 385 #endif
 386
 387     GSSEAP_ASSERT(cred->name != GSS_C_NO_NAME);
 388
 389     if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
 390         *minor = GSSEAP_BAD_INITIATOR_NAME;
 391         return GSS_S_BAD_NAME;
 392     }
 393
 394     /* identity */
 395     major = gssEapDisplayName(minor, cred->name, &identity, NULL);
 396     if (GSS_ERROR(major))
 397         return major;
 398
 399     eapPeerConfig->identity = (unsigned char *)identity.value;
 400     eapPeerConfig->identity_len = identity.length;
 401
 402     krbPrincRealmToGssBuffer(cred->name->krbPrincipal, &realm);
 403
 404     /* anonymous_identity */
 405     eapPeerConfig->anonymous_identity = GSSEAP_MALLOC(realm.length + 2);
 406     if (eapPeerConfig->anonymous_identity == NULL) {
 407         *minor = ENOMEM;
 408         return GSS_S_FAILURE;
 409     }
 410
 411     eapPeerConfig->anonymous_identity[0] = '@';
 412     memcpy(eapPeerConfig->anonymous_identity + 1, realm.value, realm.length);
 413     eapPeerConfig->anonymous_identity[1 + realm.length] = '\0';
 414     eapPeerConfig->anonymous_identity_len = 1 + realm.length;
 415
 416     /* password */
 417     if ((cred->flags & CRED_FLAG_CERTIFICATE) == 0) {
 418         eapPeerConfig->password = (unsigned char *)cred->password.value;
 419         eapPeerConfig->password_len = cred->password.length;
 420     }
 421
 422     /* certs */
 423     eapPeerConfig->ca_cert = (unsigned char *)cred->caCertificate.value;
 424     eapPeerConfig->subject_match = (unsigned char *)cred->subjectNameConstraint.value;
 425     eapPeerConfig->altsubject_match = (unsigned char *)cred->subjectAltNameConstraint.value;
 426     configBlobs[CONFIG_BLOB_CA_CERT].data = cred->caCertificateBlob.value;
 427     configBlobs[CONFIG_BLOB_CA_CERT].len = cred->caCertificateBlob.length;
 428
 429     /* eap channel binding */
 430     if (ctx->initiatorCtx.chbindData != NULL) {
 431         struct eap_peer_chbind_config *chbind_config =
 432             (struct eap_peer_chbind_config *)GSSEAP_MALLOC(sizeof(struct eap_peer_chbind_config));
 433         if (chbind_config == NULL) {
 434             *minor = ENOMEM;
 435             return GSS_S_FAILURE;
 436         }
 437
 438         chbind_config->req_data = wpabuf_mhead_u8(ctx->initiatorCtx.chbindData);
 439         chbind_config->req_data_len = wpabuf_len(ctx->initiatorCtx.chbindData);
 440         chbind_config->nsid = CHBIND_NSID_RADIUS;
 441         chbind_config->response_cb = &peerProcessChbindResponse;
 442         chbind_config->ctx = ctx;
 443         eapPeerConfig->chbind_config = chbind_config;
 444         eapPeerConfig->chbind_config_len = 1;
 445     } else {
 446         eapPeerConfig->chbind_config = NULL;
 447         eapPeerConfig->chbind_config_len = 0;
 448     }
 449     if (cred->flags & CRED_FLAG_CERTIFICATE) {
 450         /*
 451          * CRED_FLAG_CONFIG_BLOB is an internal flag which will be used in the
 452          * future to directly pass certificate and private key data to the
 453          * EAP implementation, rather than an indirected string pointer.
 454          */
 455         if (cred->flags & CRED_FLAG_CONFIG_BLOB) {
 456             eapPeerConfig->client_cert = (unsigned char *)"blob://client-cert";
 457             configBlobs[CONFIG_BLOB_CLIENT_CERT].data = cred->clientCertificate.value;
 458             configBlobs[CONFIG_BLOB_CLIENT_CERT].len  = cred->clientCertificate.length;
 459
 460             eapPeerConfig->client_cert = (unsigned char *)"blob://private-key";
 461             configBlobs[CONFIG_BLOB_PRIVATE_KEY].data = cred->clientCertificate.value;
 462             configBlobs[CONFIG_BLOB_PRIVATE_KEY].len  = cred->privateKey.length;
 463         } else {
 464             eapPeerConfig->client_cert = (unsigned char *)cred->clientCertificate.value;
 465             eapPeerConfig->private_key = (unsigned char *)cred->privateKey.value;
 466         }
 467         eapPeerConfig->private_key_passwd = (unsigned char *)cred->password.value;
 468     }
 469
 470     *minor = 0;
 471     return GSS_S_COMPLETE;
 472 }
 473
 474 static OM_uint32
 475 peerConfigFree(OM_uint32 *minor,
 476                gss_ctx_id_t ctx)
 477 {
 478     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 479
 480     if (eapPeerConfig->identity != NULL) {
 481         GSSEAP_FREE(eapPeerConfig->identity);
 482         eapPeerConfig->identity = NULL;
 483         eapPeerConfig->identity_len = 0;
 484     }
 485
 486     if (eapPeerConfig->anonymous_identity != NULL) {
 487         GSSEAP_FREE(eapPeerConfig->anonymous_identity);
 488         eapPeerConfig->anonymous_identity = NULL;
 489         eapPeerConfig->anonymous_identity_len = 0;
 490     }
 491
 492     *minor = 0;
 493     return GSS_S_COMPLETE;
 494 }
 495
 496 /*
 497  * Mark an initiator context as ready for cryptographic operations
 498  */
 499 static OM_uint32
 500 initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
 501 {
 502     OM_uint32 major;
 503     const unsigned char *key;
 504     size_t keyLength;
 505
 506     /* Cache encryption type derived from selected mechanism OID */
 507     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 508     if (GSS_ERROR(major))
 509         return major;
 510
 511     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 512         *minor = GSSEAP_KEY_UNAVAILABLE;
 513         return GSS_S_UNAVAILABLE;
 514     }
 515
 516     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 517
 518     if (keyLength < EAP_EMSK_LEN) {
 519         *minor = GSSEAP_KEY_TOO_SHORT;
 520         return GSS_S_UNAVAILABLE;
 521     }
 522
 523     major = gssEapDeriveRfc3961Key(minor,
 524                                    &key[EAP_EMSK_LEN / 2],
 525                                    EAP_EMSK_LEN / 2,
 526                                    ctx->encryptionType,
 527                                    &ctx->rfc3961Key);
 528        if (GSS_ERROR(major))
 529            return major;
 530
 531     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 532                                       &ctx->checksumType);
 533     if (GSS_ERROR(major))
 534         return major;
 535
 536     major = sequenceInit(minor,
 537                          &ctx->seqState,
 538                          ctx->recvSeq,
 539                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 540                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 541                          TRUE);
 542     if (GSS_ERROR(major))
 543         return major;
 544
 545     *minor = 0;
 546     return GSS_S_COMPLETE;
 547 }
 548
 549 static OM_uint32
 550 initBegin(OM_uint32 *minor,
 551           gss_ctx_id_t ctx,
 552           gss_name_t target,
 553           gss_OID mech,
 554           OM_uint32 reqFlags GSSEAP_UNUSED,
 555           OM_uint32 timeReq,
 556           gss_channel_bindings_t chanBindings GSSEAP_UNUSED)
 557 {
 558     OM_uint32 major;
 559     gss_cred_id_t cred = ctx->cred;
 560
 561     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 562
 563     if (cred->expiryTime)
 564         ctx->expiryTime = cred->expiryTime;
 565     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 566         ctx->expiryTime = 0;
 567     else
 568         ctx->expiryTime = time(NULL) + timeReq;
 569
 570     /*
 571      * The credential mutex protects its name, however we need to
 572      * explicitly lock the acceptor name (unlikely as it may be
 573      * that it has attributes set on it).
 574      */
 575     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 576     if (GSS_ERROR(major))
 577         return major;
 578
 579     if (target != GSS_C_NO_NAME) {
 580         GSSEAP_MUTEX_LOCK(&target->mutex);
 581
 582         major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 583         if (GSS_ERROR(major)) {
 584             GSSEAP_MUTEX_UNLOCK(&target->mutex);
 585             return major;
 586         }
 587
 588         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 589     }
 590
 591     major = gssEapCanonicalizeOid(minor,
 592                                   mech,
 593                                   OID_FLAG_NULL_VALID | OID_FLAG_MAP_NULL_TO_DEFAULT_MECH,
 594                                   &ctx->mechanismUsed);
 595     if (GSS_ERROR(major))
 596         return major;
 597
 598     /* If credentials were provided, check they're usable with this mech */
 599     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 600         *minor = GSSEAP_CRED_MECH_MISMATCH;
 601         return GSS_S_BAD_MECH;
 602     }
 603
 604     *minor = 0;
 605     return GSS_S_COMPLETE;
 606 }
 607
 608 static OM_uint32
 609 eapGssSmInitError(OM_uint32 *minor,
 610                   gss_cred_id_t cred GSSEAP_UNUSED,
 611                   gss_ctx_id_t ctx GSSEAP_UNUSED,
 612                   gss_name_t target GSSEAP_UNUSED,
 613                   gss_OID mech GSSEAP_UNUSED,
 614                   OM_uint32 reqFlags GSSEAP_UNUSED,
 615                   OM_uint32 timeReq GSSEAP_UNUSED,
 616                   gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 617                   gss_buffer_t inputToken,
 618                   gss_buffer_t outputToken GSSEAP_UNUSED,
 619                   OM_uint32 *smFlags GSSEAP_UNUSED)
 620 {
 621     OM_uint32 major;
 622     unsigned char *p;
 623
 624     if (inputToken->length < 8) {
 625         *minor = GSSEAP_TOK_TRUNC;
 626         return GSS_S_DEFECTIVE_TOKEN;
 627     }
 628
 629     p = (unsigned char *)inputToken->value;
 630
 631     major = load_uint32_be(&p[0]);
 632     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 633
 634     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 635         major = GSS_S_FAILURE;
 636         *minor = GSSEAP_BAD_ERROR_TOKEN;
 637     }
 638
 639     GSSEAP_ASSERT(GSS_ERROR(major));
 640
 641     return major;
 642 }
 643
 644 #ifdef GSSEAP_ENABLE_REAUTH
 645 static OM_uint32
 646 eapGssSmInitGssReauth(OM_uint32 *minor,
 647                       gss_cred_id_t cred,
 648                       gss_ctx_id_t ctx,
 649                       gss_name_t target,
 650                       gss_OID mech GSSEAP_UNUSED,
 651                       OM_uint32 reqFlags,
 652                       OM_uint32 timeReq,
 653                       gss_channel_bindings_t chanBindings,
 654                       gss_buffer_t inputToken,
 655                       gss_buffer_t outputToken,
 656                       OM_uint32 *smFlags GSSEAP_UNUSED)
 657 {
 658     OM_uint32 major, tmpMinor;
 659     gss_name_t mechTarget = GSS_C_NO_NAME;
 660     gss_OID actualMech = GSS_C_NO_OID;
 661     OM_uint32 gssFlags, timeRec;
 662
 663     /*
 664      * Here we use the passed in credential handle because the resolved
 665      * context credential does not currently have the reauth creds.
 666      */
 667     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 668         if (!gssEapCanReauthP(cred, target, timeReq))
 669             return GSS_S_CONTINUE_NEEDED;
 670
 671         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 672     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 673         major = GSS_S_DEFECTIVE_TOKEN;
 674         *minor = GSSEAP_WRONG_ITOK;
 675         goto cleanup;
 676     }
 677
 678     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 679
 680     major = gssEapMechToGlueName(minor, target, &mechTarget);
 681     if (GSS_ERROR(major))
 682         goto cleanup;
 683
 684     major = gssInitSecContext(minor,
 685                               cred->reauthCred,
 686                               &ctx->reauthCtx,
 687                               mechTarget,
 688                               (gss_OID)gss_mech_krb5,
 689                               reqFlags | GSS_C_MUTUAL_FLAG,
 690                               timeReq,
 691                               chanBindings,
 692                               inputToken,
 693                               &actualMech,
 694                               outputToken,
 695                               &gssFlags,
 696                               &timeRec);
 697     if (GSS_ERROR(major))
 698         goto cleanup;
 699
 700     ctx->gssFlags = gssFlags;
 701
 702     if (major == GSS_S_COMPLETE) {
 703         GSSEAP_ASSERT(GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE);
 704
 705         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 706         if (GSS_ERROR(major))
 707             goto cleanup;
 708         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 709     } else {
 710         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 711     }
 712
 713 cleanup:
 714     gssReleaseName(&tmpMinor, &mechTarget);
 715
 716     return major;
 717 }
 718 #endif /* GSSEAP_ENABLE_REAUTH */
 719
 720 #ifdef GSSEAP_DEBUG
 721 static OM_uint32
 722 eapGssSmInitVendorInfo(OM_uint32 *minor,
 723                        gss_cred_id_t cred GSSEAP_UNUSED,
 724                        gss_ctx_id_t ctx GSSEAP_UNUSED,
 725                        gss_name_t target GSSEAP_UNUSED,
 726                        gss_OID mech GSSEAP_UNUSED,
 727                        OM_uint32 reqFlags GSSEAP_UNUSED,
 728                        OM_uint32 timeReq GSSEAP_UNUSED,
 729                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 730                        gss_buffer_t inputToken GSSEAP_UNUSED,
 731                        gss_buffer_t outputToken,
 732                        OM_uint32 *smFlags GSSEAP_UNUSED)
 733 {
 734     OM_uint32 major;
 735
 736     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 737     if (GSS_ERROR(major))
 738         return major;
 739
 740     return GSS_S_CONTINUE_NEEDED;
 741 }
 742 #endif
 743
 744 static OM_uint32
 745 eapGssSmInitAcceptorName(OM_uint32 *minor,
 746                          gss_cred_id_t cred GSSEAP_UNUSED,
 747                          gss_ctx_id_t ctx,
 748                          gss_name_t target GSSEAP_UNUSED,
 749                          gss_OID mech GSSEAP_UNUSED,
 750                          OM_uint32 reqFlags GSSEAP_UNUSED,
 751                          OM_uint32 timeReq GSSEAP_UNUSED,
 752                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 753                          gss_buffer_t inputToken GSSEAP_UNUSED,
 754                          gss_buffer_t outputToken,
 755                          OM_uint32 *smFlags GSSEAP_UNUSED)
 756 {
 757     OM_uint32 major;
 758
 759     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 760         ctx->acceptorName != GSS_C_NO_NAME) {
 761
 762         /* Send desired target name to acceptor */
 763         major = gssEapDisplayName(minor, ctx->acceptorName,
 764                                   outputToken, NULL);
 765         if (GSS_ERROR(major))
 766             return major;
 767     } else if (inputToken != GSS_C_NO_BUFFER) {
 768         OM_uint32 tmpMinor;
 769         gss_name_t nameHint;
 770         int equal;
 771
 772         /* Accept target name hint from acceptor or verify acceptor */
 773         major = gssEapImportName(minor, inputToken,
 774                                  GSS_C_NT_USER_NAME,
 775                                  ctx->mechanismUsed,
 776                                  &nameHint);
 777         if (GSS_ERROR(major))
 778             return major;
 779
 780         if (ctx->acceptorName != GSS_C_NO_NAME) {
 781             /* verify name hint matched asserted acceptor name  */
 782             major = gssEapCompareName(minor,
 783                                       nameHint,
 784                                       ctx->acceptorName,
 785                                       COMPARE_NAME_FLAG_IGNORE_EMPTY_REALMS,
 786                                       &equal);
 787             if (GSS_ERROR(major)) {
 788                 gssEapReleaseName(&tmpMinor, &nameHint);
 789                 return major;
 790             }
 791
 792             gssEapReleaseName(&tmpMinor, &nameHint);
 793
 794             if (!equal) {
 795                 *minor = GSSEAP_WRONG_ACCEPTOR_NAME;
 796                 return GSS_S_DEFECTIVE_TOKEN;
 797             }
 798         } else { /* acceptor name is no_name */
 799             /* accept acceptor name hint */
 800             ctx->acceptorName = nameHint;
 801             nameHint = GSS_C_NO_NAME;
 802         }
 803     }
 804
 805
 806     /*
 807      * Currently, other parts of the code assume that the acceptor name
 808      * is available, hence this check.
 809      */
 810     if (ctx->acceptorName == GSS_C_NO_NAME) {
 811         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 812         return GSS_S_FAILURE;
 813     }
 814
 815     /*
 816      * Generate channel binding data
 817      */
 818     if (ctx->initiatorCtx.chbindData == NULL) {
 819         major = peerInitEapChannelBinding(minor, ctx);
 820         if (GSS_ERROR(major))
 821             return major;
 822     }
 823
 824     return GSS_S_CONTINUE_NEEDED;
 825 }
 826
 827 static OM_uint32
 828 eapGssSmInitIdentity(OM_uint32 *minor,
 829                      gss_cred_id_t cred GSSEAP_UNUSED,
 830                      gss_ctx_id_t ctx,
 831                      gss_name_t target GSSEAP_UNUSED,
 832                      gss_OID mech GSSEAP_UNUSED,
 833                      OM_uint32 reqFlags GSSEAP_UNUSED,
 834                      OM_uint32 timeReq GSSEAP_UNUSED,
 835                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 836                      gss_buffer_t inputToken GSSEAP_UNUSED,
 837                      gss_buffer_t outputToken GSSEAP_UNUSED,
 838                      OM_uint32 *smFlags)
 839 {
 840     struct eap_config eapConfig;
 841
 842 #ifdef GSSEAP_ENABLE_REAUTH
 843     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 844         OM_uint32 tmpMinor;
 845
 846         /* server didn't support reauthentication, sent EAP request */
 847         gssDeleteSecContext(&tmpMinor, &ctx->reauthCtx, GSS_C_NO_BUFFER);
 848         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 849         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 850     } else
 851 #endif
 852         *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 853
 854     GSSEAP_ASSERT((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 855     GSSEAP_ASSERT(inputToken == GSS_C_NO_BUFFER);
 856
 857     memset(&eapConfig, 0, sizeof(eapConfig));
 858
 859     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 860                                              &gssEapPolicyCallbacks,
 861                                              ctx,
 862                                              &eapConfig);
 863     if (ctx->initiatorCtx.eap == NULL) {
 864         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 865         return GSS_S_FAILURE;
 866     }
 867
 868     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 869
 870     /* poke EAP state machine */
 871     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 872         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 873         return GSS_S_FAILURE;
 874     }
 875
 876     GSSEAP_SM_TRANSITION_NEXT(ctx);
 877
 878     *minor = 0;
 879
 880     return GSS_S_CONTINUE_NEEDED;
 881 }
 882
 883 static OM_uint32
 884 eapGssSmInitAuthenticate(OM_uint32 *minor,
 885                          gss_cred_id_t cred GSSEAP_UNUSED,
 886                          gss_ctx_id_t ctx,
 887                          gss_name_t target GSSEAP_UNUSED,
 888                          gss_OID mech GSSEAP_UNUSED,
 889                          OM_uint32 reqFlags GSSEAP_UNUSED,
 890                          OM_uint32 timeReq GSSEAP_UNUSED,
 891                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 892                          gss_buffer_t inputToken GSSEAP_UNUSED,
 893                          gss_buffer_t outputToken,
 894                          OM_uint32 *smFlags)
 895 {
 896     OM_uint32 major;
 897     OM_uint32 tmpMinor;
 898     struct wpabuf *resp = NULL;
 899
 900     *minor = 0;
 901
 902     GSSEAP_ASSERT(inputToken != GSS_C_NO_BUFFER);
 903
 904     major = peerConfigInit(minor, ctx);
 905     if (GSS_ERROR(major))
 906         goto cleanup;
 907
 908     GSSEAP_ASSERT(ctx->initiatorCtx.eap != NULL);
 909     GSSEAP_ASSERT(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 910
 911     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 912
 913     wpabuf_set(&ctx->initiatorCtx.reqData,
 914                inputToken->value, inputToken->length);
 915
 916     major = GSS_S_CONTINUE_NEEDED;
 917
 918     eap_peer_sm_step(ctx->initiatorCtx.eap);
 919     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 920         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 921
 922         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 923     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 924         major = initReady(minor, ctx);
 925         if (GSS_ERROR(major))
 926             goto cleanup;
 927
 928         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 929         major = GSS_S_CONTINUE_NEEDED;
 930         GSSEAP_SM_TRANSITION_NEXT(ctx);
 931     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 932         major = GSS_S_DEFECTIVE_CREDENTIAL;
 933         *minor = GSSEAP_PEER_AUTH_FAILURE;
 934     } else {
 935         major = GSS_S_DEFECTIVE_TOKEN;
 936         *minor = GSSEAP_PEER_BAD_MESSAGE;
 937     }
 938
 939 cleanup:
 940     if (resp != NULL) {
 941         OM_uint32 tmpMajor;
 942         gss_buffer_desc respBuf;
 943
 944         GSSEAP_ASSERT(major == GSS_S_CONTINUE_NEEDED);
 945
 946         respBuf.length = wpabuf_len(resp);
 947         respBuf.value = (void *)wpabuf_head(resp);
 948
 949         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 950         if (GSS_ERROR(tmpMajor)) {
 951             major = tmpMajor;
 952             *minor = tmpMinor;
 953         }
 954
 955         *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 956     }
 957
 958     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 959     peerConfigFree(&tmpMinor, ctx);
 960
 961     return major;
 962 }
 963
 964 static OM_uint32
 965 eapGssSmInitGssFlags(OM_uint32 *minor,
 966                      gss_cred_id_t cred GSSEAP_UNUSED,
 967                      gss_ctx_id_t ctx,
 968                      gss_name_t target GSSEAP_UNUSED,
 969                      gss_OID mech GSSEAP_UNUSED,
 970                      OM_uint32 reqFlags GSSEAP_UNUSED,
 971                      OM_uint32 timeReq GSSEAP_UNUSED,
 972                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 973                      gss_buffer_t inputToken GSSEAP_UNUSED,
 974                      gss_buffer_t outputToken,
 975                      OM_uint32 *smFlags GSSEAP_UNUSED)
 976 {
 977     unsigned char wireFlags[4];
 978     gss_buffer_desc flagsBuf;
 979
 980     /*
 981      * As a temporary measure, force mutual authentication until channel binding is
 982      * more widely deployed.
 983      */
 984     ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 985     store_uint32_be(ctx->gssFlags & GSSEAP_WIRE_FLAGS_MASK, wireFlags);
 986
 987     flagsBuf.length = sizeof(wireFlags);
 988     flagsBuf.value = wireFlags;
 989
 990     return duplicateBuffer(minor, &flagsBuf, outputToken);
 991 }
 992
 993 static OM_uint32
 994 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 995                                gss_cred_id_t cred GSSEAP_UNUSED,
 996                                gss_ctx_id_t ctx,
 997                                gss_name_t target GSSEAP_UNUSED,
 998                                gss_OID mech GSSEAP_UNUSED,
 999                                OM_uint32 reqFlags GSSEAP_UNUSED,
1000                                OM_uint32 timeReq GSSEAP_UNUSED,
1001                                gss_channel_bindings_t chanBindings,
1002                                gss_buffer_t inputToken GSSEAP_UNUSED,
1003                                gss_buffer_t outputToken,
1004                                OM_uint32 *smFlags)
1005 {
1006     OM_uint32 major;
1007     krb5_error_code code;
1008     krb5_context krbContext;
1009     krb5_data data;
1010     krb5_checksum cksum;
1011     gss_buffer_desc cksumBuffer;
1012
1013     if (chanBindings == GSS_C_NO_CHANNEL_BINDINGS ||
1014         chanBindings->application_data.length == 0)
1015         return GSS_S_CONTINUE_NEEDED;
1016
1017     GSSEAP_KRB_INIT(&krbContext);
1018
1019     KRB_DATA_INIT(&data);
1020
1021     gssBufferToKrbData(&chanBindings->application_data, &data);
1022
1023     code = krb5_c_make_checksum(krbContext, ctx->checksumType,
1024                                 &ctx->rfc3961Key,
1025                                 KEY_USAGE_GSSEAP_CHBIND_MIC,
1026                                 &data, &cksum);
1027     if (code != 0) {
1028         *minor = code;
1029         return GSS_S_FAILURE;
1030     }
1031
1032     cksumBuffer.length = KRB_CHECKSUM_LENGTH(&cksum);
1033     cksumBuffer.value  = KRB_CHECKSUM_DATA(&cksum);
1034
1035     major = duplicateBuffer(minor, &cksumBuffer, outputToken);
1036     if (GSS_ERROR(major)) {
1037         krb5_free_checksum_contents(krbContext, &cksum);
1038         return major;
1039     }
1040
1041     *minor = 0;
1042     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
1043
1044     krb5_free_checksum_contents(krbContext, &cksum);
1045
1046     return GSS_S_CONTINUE_NEEDED;
1047 }
1048
1049 static OM_uint32
1050 eapGssSmInitInitiatorMIC(OM_uint32 *minor,
1051                          gss_cred_id_t cred GSSEAP_UNUSED,
1052                          gss_ctx_id_t ctx,
1053                          gss_name_t target GSSEAP_UNUSED,
1054                          gss_OID mech GSSEAP_UNUSED,
1055                          OM_uint32 reqFlags GSSEAP_UNUSED,
1056                          OM_uint32 timeReq GSSEAP_UNUSED,
1057                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
1058                          gss_buffer_t inputToken GSSEAP_UNUSED,
1059                          gss_buffer_t outputToken,
1060                          OM_uint32 *smFlags)
1061 {
1062     OM_uint32 major;
1063
1064     major = gssEapMakeTokenMIC(minor, ctx, outputToken);
1065     if (GSS_ERROR(major))
1066         return major;
1067
1068     GSSEAP_SM_TRANSITION_NEXT(ctx);
1069
1070     *minor = 0;
1071     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
1072
1073     return GSS_S_CONTINUE_NEEDED;
1074 }
1075
1076 #ifdef GSSEAP_ENABLE_REAUTH
1077 static OM_uint32
1078 eapGssSmInitReauthCreds(OM_uint32 *minor,
1079                         gss_cred_id_t cred,
1080                         gss_ctx_id_t ctx,
1081                         gss_name_t target GSSEAP_UNUSED,
1082                         gss_OID mech GSSEAP_UNUSED,
1083                         OM_uint32 reqFlags GSSEAP_UNUSED,
1084                         OM_uint32 timeReq GSSEAP_UNUSED,
1085                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
1086                         gss_buffer_t inputToken,
1087                         gss_buffer_t outputToken GSSEAP_UNUSED,
1088                         OM_uint32 *smFlags GSSEAP_UNUSED)
1089 {
1090     OM_uint32 major;
1091
1092     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
1093         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
1094         if (GSS_ERROR(major))
1095             return major;
1096     }
1097
1098     *minor = 0;
1099     return GSS_S_CONTINUE_NEEDED;
1100 }
1101 #endif /* GSSEAP_ENABLE_REAUTH */
1102
1103 static OM_uint32
1104 eapGssSmInitAcceptorMIC(OM_uint32 *minor,
1105                         gss_cred_id_t cred GSSEAP_UNUSED,
1106                         gss_ctx_id_t ctx,
1107                         gss_name_t target GSSEAP_UNUSED,
1108                         gss_OID mech GSSEAP_UNUSED,
1109                         OM_uint32 reqFlags GSSEAP_UNUSED,
1110                         OM_uint32 timeReq GSSEAP_UNUSED,
1111                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
1112                         gss_buffer_t inputToken,
1113                         gss_buffer_t outputToken GSSEAP_UNUSED,
1114                         OM_uint32 *smFlags GSSEAP_UNUSED)
1115 {
1116     OM_uint32 major;
1117
1118     major = gssEapVerifyTokenMIC(minor, ctx, inputToken);
1119     if (GSS_ERROR(major))
1120         return major;
1121
1122     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
1123
1124     *minor = 0;
1125
1126     return GSS_S_COMPLETE;
1127 }
1128
1129 static struct gss_eap_sm eapGssInitiatorSm[] = {
1130     {
1131         ITOK_TYPE_CONTEXT_ERR,
1132         ITOK_TYPE_NONE,
1133         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
1134         0,
1135         eapGssSmInitError
1136     },
1137     {
1138         ITOK_TYPE_ACCEPTOR_NAME_RESP,
1139         ITOK_TYPE_ACCEPTOR_NAME_REQ,
1140         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE |
1141         GSSEAP_STATE_ACCEPTOR_EXTS,
1142         0,
1143         eapGssSmInitAcceptorName
1144     },
1145 #ifdef GSSEAP_DEBUG
1146     {
1147         ITOK_TYPE_NONE,
1148         ITOK_TYPE_VENDOR_INFO,
1149         GSSEAP_STATE_INITIAL,
1150         0,
1151         eapGssSmInitVendorInfo
1152     },
1153 #endif
1154 #ifdef GSSEAP_ENABLE_REAUTH
1155     {
1156         ITOK_TYPE_REAUTH_RESP,
1157         ITOK_TYPE_REAUTH_REQ,
1158         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
1159         0,
1160         eapGssSmInitGssReauth
1161     },
1162 #endif
1163     {
1164         ITOK_TYPE_NONE,
1165         ITOK_TYPE_NONE,
1166 #ifdef GSSEAP_ENABLE_REAUTH
1167         GSSEAP_STATE_REAUTHENTICATE |
1168 #endif
1169         GSSEAP_STATE_INITIAL,
1170         SM_ITOK_FLAG_REQUIRED,
1171         eapGssSmInitIdentity
1172     },
1173     {
1174         ITOK_TYPE_EAP_REQ,
1175         ITOK_TYPE_EAP_RESP,
1176         GSSEAP_STATE_AUTHENTICATE,
1177         SM_ITOK_FLAG_REQUIRED,
1178         eapGssSmInitAuthenticate
1179     },
1180     {
1181         ITOK_TYPE_NONE,
1182         ITOK_TYPE_GSS_FLAGS,
1183         GSSEAP_STATE_INITIATOR_EXTS,
1184         0,
1185         eapGssSmInitGssFlags
1186     },
1187     {
1188         ITOK_TYPE_NONE,
1189         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
1190         GSSEAP_STATE_INITIATOR_EXTS,
1191         0,
1192         eapGssSmInitGssChannelBindings
1193     },
1194     {
1195         ITOK_TYPE_NONE,
1196         ITOK_TYPE_INITIATOR_MIC,
1197         GSSEAP_STATE_INITIATOR_EXTS,
1198         SM_ITOK_FLAG_REQUIRED,
1199         eapGssSmInitInitiatorMIC
1200     },
1201 #ifdef GSSEAP_ENABLE_REAUTH
1202     {
1203         ITOK_TYPE_REAUTH_CREDS,
1204         ITOK_TYPE_NONE,
1205         GSSEAP_STATE_ACCEPTOR_EXTS,
1206         0,
1207         eapGssSmInitReauthCreds
1208     },
1209 #endif
1210     /* other extensions go here */
1211     {
1212         ITOK_TYPE_ACCEPTOR_MIC,
1213         ITOK_TYPE_NONE,
1214         GSSEAP_STATE_ACCEPTOR_EXTS,
1215         SM_ITOK_FLAG_REQUIRED,
1216         eapGssSmInitAcceptorMIC
1217     }
1218 };
1219
1220 OM_uint32
1221 gssEapInitSecContext(OM_uint32 *minor,
1222                      gss_cred_id_t cred,
1223                      gss_ctx_id_t ctx,
1224                      gss_name_t target_name,
1225                      gss_OID mech_type,
1226                      OM_uint32 req_flags,
1227                      OM_uint32 time_req,
1228                      gss_channel_bindings_t input_chan_bindings,
1229                      gss_buffer_t input_token,
1230                      gss_OID *actual_mech_type,
1231                      gss_buffer_t output_token,
1232                      OM_uint32 *ret_flags,
1233                      OM_uint32 *time_rec)
1234 {
1235     OM_uint32 major, tmpMinor;
1236     int initialContextToken = (ctx->mechanismUsed == GSS_C_NO_OID);
1237
1238     /*
1239      * XXX is acquiring the credential lock here necessary? The password is
1240      * mutable but the contract could specify that this is not updated whilst
1241      * a context is being initialized.
1242      */
1243     if (cred != GSS_C_NO_CREDENTIAL)
1244         GSSEAP_MUTEX_LOCK(&cred->mutex);
1245
1246     if (ctx->cred == GSS_C_NO_CREDENTIAL) {
1247         major = gssEapResolveInitiatorCred(minor, cred, target_name, &ctx->cred);
1248         if (GSS_ERROR(major))
1249             goto cleanup;
1250
1251         GSSEAP_ASSERT(ctx->cred != GSS_C_NO_CREDENTIAL);
1252     }
1253
1254     GSSEAP_MUTEX_LOCK(&ctx->cred->mutex);
1255
1256     GSSEAP_ASSERT(ctx->cred->flags & CRED_FLAG_RESOLVED);
1257     GSSEAP_ASSERT(ctx->cred->flags & CRED_FLAG_INITIATE);
1258
1259     if (initialContextToken) {
1260         major = initBegin(minor, ctx, target_name, mech_type,
1261                           req_flags, time_req, input_chan_bindings);
1262         if (GSS_ERROR(major))
1263             goto cleanup;
1264     }
1265
1266     major = gssEapSmStep(minor,
1267                          cred,
1268                          ctx,
1269                          target_name,
1270                          mech_type,
1271                          req_flags,
1272                          time_req,
1273                          input_chan_bindings,
1274                          input_token,
1275                          output_token,
1276                          eapGssInitiatorSm,
1277                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
1278     if (GSS_ERROR(major))
1279         goto cleanup;
1280
1281     if (actual_mech_type != NULL) {
1282         OM_uint32 tmpMajor;
1283
1284         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, actual_mech_type);
1285         if (GSS_ERROR(tmpMajor)) {
1286             major = tmpMajor;
1287             *minor = tmpMinor;
1288             goto cleanup;
1289         }
1290     }
1291
1292     if (ret_flags != NULL)
1293         *ret_flags = ctx->gssFlags;
1294
1295     if (time_rec != NULL)
1296         gssEapContextTime(&tmpMinor, ctx, time_rec);
1297
1298     GSSEAP_ASSERT(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1299
1300 cleanup:
1301     if (cred != GSS_C_NO_CREDENTIAL)
1302         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1303     if (ctx->cred != GSS_C_NO_CREDENTIAL)
1304         GSSEAP_MUTEX_UNLOCK(&ctx->cred->mutex);
1305
1306     return major;
1307 }
1308
1309 OM_uint32 GSSAPI_CALLCONV
1310 gss_init_sec_context(OM_uint32 *minor,
1311                      gss_cred_id_t cred,
1312                      gss_ctx_id_t *context_handle,
1313                      gss_name_t target_name,
1314                      gss_OID mech_type,
1315                      OM_uint32 req_flags,
1316                      OM_uint32 time_req,
1317                      gss_channel_bindings_t input_chan_bindings,
1318                      gss_buffer_t input_token,
1319                      gss_OID *actual_mech_type,
1320                      gss_buffer_t output_token,
1321                      OM_uint32 *ret_flags,
1322                      OM_uint32 *time_rec)
1323 {
1324     OM_uint32 major, tmpMinor;
1325     gss_ctx_id_t ctx = *context_handle;
1326
1327     *minor = 0;
1328
1329     output_token->length = 0;
1330     output_token->value = NULL;
1331
1332     if (ctx == GSS_C_NO_CONTEXT) {
1333         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
1334             *minor = GSSEAP_WRONG_SIZE;
1335             return GSS_S_DEFECTIVE_TOKEN;
1336         }
1337
1338         major = gssEapAllocContext(minor, &ctx);
1339         if (GSS_ERROR(major))
1340             return major;
1341
1342         ctx->flags |= CTX_FLAG_INITIATOR;
1343
1344         *context_handle = ctx;
1345     }
1346
1347     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1348
1349     major = gssEapInitSecContext(minor,
1350                                  cred,
1351                                  ctx,
1352                                  target_name,
1353                                  mech_type,
1354                                  req_flags,
1355                                  time_req,
1356                                  input_chan_bindings,
1357                                  input_token,
1358                                  actual_mech_type,
1359                                  output_token,
1360                                  ret_flags,
1361                                  time_rec);
1362
1363     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1364
1365     if (GSS_ERROR(major))
1366         gssEapReleaseContext(&tmpMinor, context_handle);
1367
1368     return major;
1369 }