mech_eap/init_sec_context.c

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