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
 214 #define CHBIND_SERVICE_NAME_FLAG        0x01
 215 #define CHBIND_HOST_NAME_FLAG           0x02
 216 #define CHBIND_SERVICE_SPECIFIC_FLAG    0x04
 217 #define CHBIND_REALM_NAME_FLAG          0x08
 218
 219 static OM_uint32
 220 peerInitEapChannelBinding(OM_uint32 *minor, gss_ctx_id_t ctx)
 221 {
 222     struct wpabuf *buf = NULL;
 223     unsigned int chbindReqFlags = 0;
 224     krb5_principal princ = NULL;
 225     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 226     OM_uint32 major = GSS_S_COMPLETE;
 227     krb5_context krbContext = NULL;
 228
 229     /* XXX is this check redundant? */
 230     if (ctx->acceptorName == GSS_C_NO_NAME) {
 231         major = GSS_S_BAD_NAME;
 232         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 233         goto cleanup;
 234     }
 235
 236     princ = ctx->acceptorName->krbPrincipal;
 237
 238     krbPrincComponentToGssBuffer(princ, 0, &nameBuf);
 239     if (nameBuf.length > 0) {
 240         major = gssEapRadiusAddAttr(minor, &buf, PW_GSS_ACCEPTOR_SERVICE_NAME,
 241                                     0, &nameBuf);
 242         if (GSS_ERROR(major))
 243             goto cleanup;
 244
 245         chbindReqFlags |= CHBIND_SERVICE_NAME_FLAG;
 246     }
 247
 248     krbPrincComponentToGssBuffer(princ, 1, &nameBuf);
 249     if (nameBuf.length > 0) {
 250         major = gssEapRadiusAddAttr(minor, &buf, PW_GSS_ACCEPTOR_HOST_NAME,
 251                                     0, &nameBuf);
 252         if (GSS_ERROR(major))
 253             goto cleanup;
 254
 255         chbindReqFlags |= CHBIND_HOST_NAME_FLAG;
 256     }
 257
 258     GSSEAP_KRB_INIT(&krbContext);
 259
 260     *minor = krbPrincUnparseServiceSpecifics(krbContext, princ, &nameBuf);
 261     if (*minor != 0)
 262         goto cleanup;
 263
 264     if (nameBuf.length > 0) {
 265         major = gssEapRadiusAddAttr(minor, &buf,
 266                                     PW_GSS_ACCEPTOR_SERVICE_SPECIFICS,
 267                                     0, &nameBuf);
 268         if (GSS_ERROR(major))
 269             goto cleanup;
 270
 271         chbindReqFlags |= CHBIND_SERVICE_SPECIFIC_FLAG;
 272     }
 273
 274     krbFreeUnparsedName(krbContext, &nameBuf);
 275     krbPrincRealmToGssBuffer(princ, &nameBuf);
 276
 277     if (nameBuf.length > 0) {
 278         major = gssEapRadiusAddAttr(minor, &buf,
 279                                     PW_GSS_ACCEPTOR_REALM_NAME,
 280                                     0, &nameBuf);
 281         if (GSS_ERROR(major))
 282             goto cleanup;
 283
 284         chbindReqFlags |= CHBIND_REALM_NAME_FLAG;
 285     }
 286
 287     if (chbindReqFlags == 0) {
 288         major = GSS_S_BAD_NAME;
 289         *minor = GSSEAP_BAD_ACCEPTOR_NAME;
 290         goto cleanup;
 291     }
 292
 293     ctx->initiatorCtx.chbindData = buf;
 294     ctx->initiatorCtx.chbindReqFlags = chbindReqFlags;
 295
 296     buf = NULL;
 297
 298     major = GSS_S_COMPLETE;
 299     *minor = 0;
 300
 301 cleanup:
 302     /*namebuf is freed when used and may be left with a unowned pointer*/
 303     wpabuf_free(buf);
 304
 305     return major;
 306 }
 307
 308 static void
 309 peerProcessChbindResponse(void *context, int code, int nsid,
 310                           u8 *data, size_t len)
 311 {
 312     radius_parser msg;
 313     gss_ctx_id_t ctx = (gss_ctx_id_t )context;
 314     void *vsadata;
 315     u8 type;
 316     u32 vendor_id;
 317     u32 chbindRetFlags = 0;
 318     size_t vsadata_len;
 319
 320     if (nsid != CHBIND_NSID_RADIUS)
 321         return;
 322
 323     if (data == NULL)
 324         return;
 325     msg = radius_parser_start(data, len);
 326     if (msg == NULL)
 327         return;
 328
 329     while (radius_parser_parse_tlv(msg, &type, &vendor_id, &vsadata,
 330                                    &vsadata_len) == 0) {
 331         switch (type) {
 332         case PW_GSS_ACCEPTOR_SERVICE_NAME:
 333             chbindRetFlags |= CHBIND_SERVICE_NAME_FLAG;
 334             break;
 335         case PW_GSS_ACCEPTOR_HOST_NAME:
 336             chbindRetFlags |= CHBIND_HOST_NAME_FLAG;
 337             break;
 338         case PW_GSS_ACCEPTOR_SERVICE_SPECIFICS:
 339             chbindRetFlags |= CHBIND_SERVICE_SPECIFIC_FLAG;
 340             break;
 341         case PW_GSS_ACCEPTOR_REALM_NAME:
 342             chbindRetFlags |= CHBIND_REALM_NAME_FLAG;
 343             break;
 344         }
 345     }
 346
 347     radius_parser_finish(msg);
 348
 349     if (code == CHBIND_CODE_SUCCESS &&
 350         ((chbindRetFlags & ctx->initiatorCtx.chbindReqFlags) == ctx->initiatorCtx.chbindReqFlags)) {
 351         ctx->flags |= CTX_FLAG_EAP_CHBIND_ACCEPT;
 352         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 353     } /* else log failures? */
 354 }
 355
 356 static OM_uint32
 357 peerConfigInit(OM_uint32 *minor, gss_ctx_id_t ctx)
 358 {
 359     OM_uint32 major;
 360     krb5_context krbContext;
 361     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 362     struct wpa_config_blob *configBlobs = ctx->initiatorCtx.configBlobs;
 363     gss_buffer_desc identity = GSS_C_EMPTY_BUFFER;
 364     gss_buffer_desc realm = GSS_C_EMPTY_BUFFER;
 365     gss_cred_id_t cred = ctx->cred;
 366
 367     eapPeerConfig->identity = NULL;
 368     eapPeerConfig->identity_len = 0;
 369     eapPeerConfig->anonymous_identity = NULL;
 370     eapPeerConfig->anonymous_identity_len = 0;
 371     eapPeerConfig->password = NULL;
 372     eapPeerConfig->password_len = 0;
 373     eapPeerConfig->eap_methods = (struct eap_method_type *) allowed_eap_method_types;
 374
 375     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 376
 377     GSSEAP_KRB_INIT(&krbContext);
 378
 379     eapPeerConfig->fragment_size = 1024;
 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_const_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(&((gss_name_t)target)->mutex);
 575
 576         major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 577         if (GSS_ERROR(major)) {
 578             GSSEAP_MUTEX_LOCK(&((gss_name_t)target)->mutex);
 579             return major;
 580         }
 581
 582         GSSEAP_MUTEX_UNLOCK(&((gss_name_t)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_const_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 =  load_uint32_be(&p[4]);
 627     if ((*minor >0) && (*minor < 128))
 628       * minor += ERROR_TABLE_BASE_eapg;
 629     else *minor = 0;
 630
 631     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 632         major = GSS_S_FAILURE;
 633         *minor = GSSEAP_BAD_ERROR_TOKEN;
 634     }
 635
 636     GSSEAP_ASSERT(GSS_ERROR(major));
 637
 638     return major;
 639 }
 640
 641 #ifdef GSSEAP_ENABLE_REAUTH
 642 static OM_uint32
 643 eapGssSmInitGssReauth(OM_uint32 *minor,
 644                       gss_cred_id_t cred,
 645                       gss_ctx_id_t ctx,
 646                       gss_const_name_t target,
 647                       gss_OID mech GSSEAP_UNUSED,
 648                       OM_uint32 reqFlags,
 649                       OM_uint32 timeReq,
 650                       gss_channel_bindings_t chanBindings,
 651                       gss_buffer_t inputToken,
 652                       gss_buffer_t outputToken,
 653                       OM_uint32 *smFlags GSSEAP_UNUSED)
 654 {
 655     OM_uint32 major, tmpMinor;
 656     gss_name_t mechTarget = GSS_C_NO_NAME;
 657     gss_OID actualMech = GSS_C_NO_OID;
 658     OM_uint32 gssFlags, timeRec;
 659
 660     /*
 661      * Here we use the passed in credential handle because the resolved
 662      * context credential does not currently have the reauth creds.
 663      */
 664     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 665         if (!gssEapCanReauthP(cred, target, timeReq))
 666             return GSS_S_CONTINUE_NEEDED;
 667
 668         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 669     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 670         major = GSS_S_DEFECTIVE_TOKEN;
 671         *minor = GSSEAP_WRONG_ITOK;
 672         goto cleanup;
 673     }
 674
 675     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 676
 677     major = gssEapMechToGlueName(minor, target, &mechTarget);
 678     if (GSS_ERROR(major))
 679         goto cleanup;
 680
 681     major = gssInitSecContext(minor,
 682                               cred->reauthCred,
 683                               &ctx->reauthCtx,
 684                               mechTarget,
 685                               (gss_OID)gss_mech_krb5,
 686                               reqFlags | GSS_C_MUTUAL_FLAG,
 687                               timeReq,
 688                               chanBindings,
 689                               inputToken,
 690                               &actualMech,
 691                               outputToken,
 692                               &gssFlags,
 693                               &timeRec);
 694     if (GSS_ERROR(major))
 695         goto cleanup;
 696
 697     ctx->gssFlags = gssFlags;
 698
 699     if (major == GSS_S_COMPLETE) {
 700         GSSEAP_ASSERT(GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE);
 701
 702         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 703         if (GSS_ERROR(major))
 704             goto cleanup;
 705         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 706     } else {
 707         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 708     }
 709
 710 cleanup:
 711     gssReleaseName(&tmpMinor, &mechTarget);
 712
 713     return major;
 714 }
 715 #endif /* GSSEAP_ENABLE_REAUTH */
 716
 717 #ifdef GSSEAP_DEBUG
 718 static OM_uint32
 719 eapGssSmInitVendorInfo(OM_uint32 *minor,
 720                        gss_cred_id_t cred GSSEAP_UNUSED,
 721                        gss_ctx_id_t ctx GSSEAP_UNUSED,
 722                        gss_const_name_t target GSSEAP_UNUSED,
 723                        gss_OID mech GSSEAP_UNUSED,
 724                        OM_uint32 reqFlags GSSEAP_UNUSED,
 725                        OM_uint32 timeReq GSSEAP_UNUSED,
 726                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 727                        gss_buffer_t inputToken GSSEAP_UNUSED,
 728                        gss_buffer_t outputToken,
 729                        OM_uint32 *smFlags GSSEAP_UNUSED)
 730 {
 731     OM_uint32 major;
 732
 733     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 734     if (GSS_ERROR(major))
 735         return major;
 736
 737     return GSS_S_CONTINUE_NEEDED;
 738 }
 739 #endif
 740
 741 static OM_uint32
 742 eapGssSmInitAcceptorName(OM_uint32 *minor,
 743                          gss_cred_id_t cred GSSEAP_UNUSED,
 744                          gss_ctx_id_t ctx,
 745                          gss_const_name_t target GSSEAP_UNUSED,
 746                          gss_OID mech GSSEAP_UNUSED,
 747                          OM_uint32 reqFlags GSSEAP_UNUSED,
 748                          OM_uint32 timeReq GSSEAP_UNUSED,
 749                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 750                          gss_buffer_t inputToken GSSEAP_UNUSED,
 751                          gss_buffer_t outputToken,
 752                          OM_uint32 *smFlags GSSEAP_UNUSED)
 753 {
 754     OM_uint32 major;
 755
 756     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 757         ctx->acceptorName != GSS_C_NO_NAME) {
 758
 759         /* Send desired target name to acceptor */
 760         major = gssEapDisplayName(minor, ctx->acceptorName,
 761                                   outputToken, NULL);
 762         if (GSS_ERROR(major))
 763             return major;
 764     } else if (inputToken != GSS_C_NO_BUFFER) {
 765         OM_uint32 tmpMinor;
 766         gss_name_t nameHint;
 767         int equal;
 768
 769         /* Accept target name hint from acceptor or verify acceptor */
 770         major = gssEapImportName(minor, inputToken,
 771                                  GSS_C_NT_USER_NAME,
 772                                  ctx->mechanismUsed,
 773                                  &nameHint);
 774         if (GSS_ERROR(major))
 775             return major;
 776
 777         if (ctx->acceptorName != GSS_C_NO_NAME) {
 778             /* verify name hint matched asserted acceptor name  */
 779             major = gssEapCompareName(minor,
 780                                       nameHint,
 781                                       ctx->acceptorName,
 782                                       COMPARE_NAME_FLAG_IGNORE_EMPTY_REALMS,
 783                                       &equal);
 784             if (GSS_ERROR(major)) {
 785                 gssEapReleaseName(&tmpMinor, &nameHint);
 786                 return major;
 787             }
 788
 789             gssEapReleaseName(&tmpMinor, &nameHint);
 790
 791             if (!equal) {
 792                 *minor = GSSEAP_WRONG_ACCEPTOR_NAME;
 793                 return GSS_S_DEFECTIVE_TOKEN;
 794             }
 795         } else { /* acceptor name is no_name */
 796             /* accept acceptor name hint */
 797             ctx->acceptorName = nameHint;
 798             nameHint = GSS_C_NO_NAME;
 799         }
 800     }
 801
 802
 803     /*
 804      * Currently, other parts of the code assume that the acceptor name
 805      * is available, hence this check.
 806      */
 807     if (ctx->acceptorName == GSS_C_NO_NAME) {
 808         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 809         return GSS_S_FAILURE;
 810     }
 811
 812     /*
 813      * Generate channel binding data
 814      */
 815     if (ctx->initiatorCtx.chbindData == NULL) {
 816         major = peerInitEapChannelBinding(minor, ctx);
 817         if (GSS_ERROR(major))
 818             return major;
 819     }
 820
 821     return GSS_S_CONTINUE_NEEDED;
 822 }
 823
 824 static OM_uint32
 825 eapGssSmInitIdentity(OM_uint32 *minor,
 826                      gss_cred_id_t cred GSSEAP_UNUSED,
 827                      gss_ctx_id_t ctx,
 828                      gss_const_name_t target GSSEAP_UNUSED,
 829                      gss_OID mech GSSEAP_UNUSED,
 830                      OM_uint32 reqFlags GSSEAP_UNUSED,
 831                      OM_uint32 timeReq GSSEAP_UNUSED,
 832                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 833                      gss_buffer_t inputToken GSSEAP_UNUSED,
 834                      gss_buffer_t outputToken GSSEAP_UNUSED,
 835                      OM_uint32 *smFlags)
 836 {
 837     struct eap_config eapConfig;
 838
 839 #ifdef GSSEAP_ENABLE_REAUTH
 840     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 841         OM_uint32 tmpMinor;
 842
 843         /* server didn't support reauthentication, sent EAP request */
 844         gssDeleteSecContext(&tmpMinor, &ctx->reauthCtx, GSS_C_NO_BUFFER);
 845         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 846         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 847     } else
 848 #endif
 849         *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 850
 851     GSSEAP_ASSERT((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 852     GSSEAP_ASSERT(inputToken == GSS_C_NO_BUFFER);
 853
 854     memset(&eapConfig, 0, sizeof(eapConfig));
 855
 856     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 857                                              &gssEapPolicyCallbacks,
 858                                              ctx,
 859                                              &eapConfig);
 860     if (ctx->initiatorCtx.eap == NULL) {
 861         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 862         return GSS_S_FAILURE;
 863     }
 864
 865     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 866
 867     /* poke EAP state machine */
 868     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 869         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 870         return GSS_S_FAILURE;
 871     }
 872
 873     GSSEAP_SM_TRANSITION_NEXT(ctx);
 874
 875     *minor = 0;
 876
 877     return GSS_S_CONTINUE_NEEDED;
 878 }
 879
 880 static OM_uint32
 881 eapGssSmInitAuthenticate(OM_uint32 *minor,
 882                          gss_cred_id_t cred GSSEAP_UNUSED,
 883                          gss_ctx_id_t ctx,
 884                          gss_const_name_t target GSSEAP_UNUSED,
 885                          gss_OID mech GSSEAP_UNUSED,
 886                          OM_uint32 reqFlags GSSEAP_UNUSED,
 887                          OM_uint32 timeReq GSSEAP_UNUSED,
 888                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 889                          gss_buffer_t inputToken GSSEAP_UNUSED,
 890                          gss_buffer_t outputToken,
 891                          OM_uint32 *smFlags)
 892 {
 893     OM_uint32 major;
 894     OM_uint32 tmpMinor;
 895     struct wpabuf *resp = NULL;
 896
 897     *minor = 0;
 898
 899     GSSEAP_ASSERT(inputToken != GSS_C_NO_BUFFER);
 900
 901     major = peerConfigInit(minor, ctx);
 902     if (GSS_ERROR(major))
 903         goto cleanup;
 904
 905     GSSEAP_ASSERT(ctx->initiatorCtx.eap != NULL);
 906     GSSEAP_ASSERT(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 907
 908     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 909
 910     wpabuf_set(&ctx->initiatorCtx.reqData,
 911                inputToken->value, inputToken->length);
 912
 913     major = GSS_S_CONTINUE_NEEDED;
 914
 915     eap_peer_sm_step(ctx->initiatorCtx.eap);
 916     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 917         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 918
 919         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 920     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 921         major = initReady(minor, ctx);
 922         if (GSS_ERROR(major))
 923             goto cleanup;
 924
 925         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 926         major = GSS_S_CONTINUE_NEEDED;
 927         GSSEAP_SM_TRANSITION_NEXT(ctx);
 928     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 929         major = GSS_S_DEFECTIVE_CREDENTIAL;
 930         *minor = GSSEAP_PEER_AUTH_FAILURE;
 931     } else {
 932         major = GSS_S_DEFECTIVE_TOKEN;
 933         *minor = GSSEAP_PEER_BAD_MESSAGE;
 934     }
 935
 936 cleanup:
 937     if (resp != NULL) {
 938         OM_uint32 tmpMajor;
 939         gss_buffer_desc respBuf;
 940
 941         GSSEAP_ASSERT(major == GSS_S_CONTINUE_NEEDED);
 942
 943         respBuf.length = wpabuf_len(resp);
 944         respBuf.value = (void *)wpabuf_head(resp);
 945
 946         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 947         if (GSS_ERROR(tmpMajor)) {
 948             major = tmpMajor;
 949             *minor = tmpMinor;
 950         }
 951
 952         *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 953     }
 954
 955     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 956     peerConfigFree(&tmpMinor, ctx);
 957
 958     return major;
 959 }
 960
 961 static OM_uint32
 962 eapGssSmInitGssFlags(OM_uint32 *minor,
 963                      gss_cred_id_t cred GSSEAP_UNUSED,
 964                      gss_ctx_id_t ctx,
 965                      gss_const_name_t target GSSEAP_UNUSED,
 966                      gss_OID mech GSSEAP_UNUSED,
 967                      OM_uint32 reqFlags GSSEAP_UNUSED,
 968                      OM_uint32 timeReq GSSEAP_UNUSED,
 969                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 970                      gss_buffer_t inputToken GSSEAP_UNUSED,
 971                      gss_buffer_t outputToken,
 972                      OM_uint32 *smFlags GSSEAP_UNUSED)
 973 {
 974     unsigned char wireFlags[4];
 975     gss_buffer_desc flagsBuf;
 976
 977     /*
 978      * As a temporary measure, force mutual authentication until channel binding is
 979      * more widely deployed.
 980      */
 981     ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 982     store_uint32_be(ctx->gssFlags & GSSEAP_WIRE_FLAGS_MASK, wireFlags);
 983
 984     flagsBuf.length = sizeof(wireFlags);
 985     flagsBuf.value = wireFlags;
 986
 987     return duplicateBuffer(minor, &flagsBuf, outputToken);
 988 }
 989
 990 static OM_uint32
 991 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 992                                gss_cred_id_t cred GSSEAP_UNUSED,
 993                                gss_ctx_id_t ctx,
 994                                gss_const_name_t target GSSEAP_UNUSED,
 995                                gss_OID mech GSSEAP_UNUSED,
 996                                OM_uint32 reqFlags GSSEAP_UNUSED,
 997                                OM_uint32 timeReq GSSEAP_UNUSED,
 998                                gss_channel_bindings_t chanBindings,
 999                                gss_buffer_t inputToken GSSEAP_UNUSED,
1000                                gss_buffer_t outputToken,
1001                                OM_uint32 *smFlags)
1002 {
1003     OM_uint32 major;
1004     krb5_error_code code;
1005     krb5_context krbContext;
1006     krb5_data data;
1007     krb5_checksum cksum;
1008     gss_buffer_desc cksumBuffer;
1009
1010     if (chanBindings == GSS_C_NO_CHANNEL_BINDINGS ||
1011         chanBindings->application_data.length == 0)
1012         return GSS_S_CONTINUE_NEEDED;
1013
1014     GSSEAP_KRB_INIT(&krbContext);
1015
1016     KRB_DATA_INIT(&data);
1017
1018     gssBufferToKrbData(&chanBindings->application_data, &data);
1019
1020     code = krb5_c_make_checksum(krbContext, ctx->checksumType,
1021                                 &ctx->rfc3961Key,
1022                                 KEY_USAGE_GSSEAP_CHBIND_MIC,
1023                                 &data, &cksum);
1024     if (code != 0) {
1025         *minor = code;
1026         return GSS_S_FAILURE;
1027     }
1028
1029     cksumBuffer.length = KRB_CHECKSUM_LENGTH(&cksum);
1030     cksumBuffer.value  = KRB_CHECKSUM_DATA(&cksum);
1031
1032     major = duplicateBuffer(minor, &cksumBuffer, outputToken);
1033     if (GSS_ERROR(major)) {
1034         krb5_free_checksum_contents(krbContext, &cksum);
1035         return major;
1036     }
1037
1038     *minor = 0;
1039     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
1040
1041     krb5_free_checksum_contents(krbContext, &cksum);
1042
1043     return GSS_S_CONTINUE_NEEDED;
1044 }
1045
1046 static OM_uint32
1047 eapGssSmInitInitiatorMIC(OM_uint32 *minor,
1048                          gss_cred_id_t cred GSSEAP_UNUSED,
1049                          gss_ctx_id_t ctx,
1050                          gss_const_name_t target GSSEAP_UNUSED,
1051                          gss_OID mech GSSEAP_UNUSED,
1052                          OM_uint32 reqFlags GSSEAP_UNUSED,
1053                          OM_uint32 timeReq GSSEAP_UNUSED,
1054                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
1055                          gss_buffer_t inputToken GSSEAP_UNUSED,
1056                          gss_buffer_t outputToken,
1057                          OM_uint32 *smFlags)
1058 {
1059     OM_uint32 major;
1060
1061     major = gssEapMakeTokenMIC(minor, ctx, outputToken);
1062     if (GSS_ERROR(major))
1063         return major;
1064
1065     GSSEAP_SM_TRANSITION_NEXT(ctx);
1066
1067     *minor = 0;
1068     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
1069
1070     return GSS_S_CONTINUE_NEEDED;
1071 }
1072
1073 #ifdef GSSEAP_ENABLE_REAUTH
1074 static OM_uint32
1075 eapGssSmInitReauthCreds(OM_uint32 *minor,
1076                         gss_cred_id_t cred,
1077                         gss_ctx_id_t ctx,
1078                         gss_const_name_t target GSSEAP_UNUSED,
1079                         gss_OID mech GSSEAP_UNUSED,
1080                         OM_uint32 reqFlags GSSEAP_UNUSED,
1081                         OM_uint32 timeReq GSSEAP_UNUSED,
1082                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
1083                         gss_buffer_t inputToken,
1084                         gss_buffer_t outputToken GSSEAP_UNUSED,
1085                         OM_uint32 *smFlags GSSEAP_UNUSED)
1086 {
1087     OM_uint32 major;
1088
1089     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
1090         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
1091         if (GSS_ERROR(major))
1092             return major;
1093     }
1094
1095     *minor = 0;
1096     return GSS_S_CONTINUE_NEEDED;
1097 }
1098 #endif /* GSSEAP_ENABLE_REAUTH */
1099
1100 static OM_uint32
1101 eapGssSmInitAcceptorMIC(OM_uint32 *minor,
1102                         gss_cred_id_t cred GSSEAP_UNUSED,
1103                         gss_ctx_id_t ctx,
1104                         gss_const_name_t target GSSEAP_UNUSED,
1105                         gss_OID mech GSSEAP_UNUSED,
1106                         OM_uint32 reqFlags GSSEAP_UNUSED,
1107                         OM_uint32 timeReq GSSEAP_UNUSED,
1108                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
1109                         gss_buffer_t inputToken,
1110                         gss_buffer_t outputToken GSSEAP_UNUSED,
1111                         OM_uint32 *smFlags GSSEAP_UNUSED)
1112 {
1113     OM_uint32 major;
1114
1115     major = gssEapVerifyTokenMIC(minor, ctx, inputToken);
1116     if (GSS_ERROR(major))
1117         return major;
1118
1119     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
1120
1121     *minor = 0;
1122
1123     return GSS_S_COMPLETE;
1124 }
1125
1126 static struct gss_eap_sm eapGssInitiatorSm[] = {
1127     {
1128         ITOK_TYPE_CONTEXT_ERR,
1129         ITOK_TYPE_NONE,
1130         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
1131         0,
1132         eapGssSmInitError
1133     },
1134     {
1135         ITOK_TYPE_ACCEPTOR_NAME_RESP,
1136         ITOK_TYPE_ACCEPTOR_NAME_REQ,
1137         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE |
1138         GSSEAP_STATE_ACCEPTOR_EXTS,
1139         0,
1140         eapGssSmInitAcceptorName
1141     },
1142 #ifdef GSSEAP_DEBUG
1143     {
1144         ITOK_TYPE_NONE,
1145         ITOK_TYPE_VENDOR_INFO,
1146         GSSEAP_STATE_INITIAL,
1147         0,
1148         eapGssSmInitVendorInfo
1149     },
1150 #endif
1151 #ifdef GSSEAP_ENABLE_REAUTH
1152     {
1153         ITOK_TYPE_REAUTH_RESP,
1154         ITOK_TYPE_REAUTH_REQ,
1155         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
1156         0,
1157         eapGssSmInitGssReauth
1158     },
1159 #endif
1160     {
1161         ITOK_TYPE_NONE,
1162         ITOK_TYPE_NONE,
1163 #ifdef GSSEAP_ENABLE_REAUTH
1164         GSSEAP_STATE_REAUTHENTICATE |
1165 #endif
1166         GSSEAP_STATE_INITIAL,
1167         SM_ITOK_FLAG_REQUIRED,
1168         eapGssSmInitIdentity
1169     },
1170     {
1171         ITOK_TYPE_EAP_REQ,
1172         ITOK_TYPE_EAP_RESP,
1173         GSSEAP_STATE_AUTHENTICATE,
1174         SM_ITOK_FLAG_REQUIRED,
1175         eapGssSmInitAuthenticate
1176     },
1177     {
1178         ITOK_TYPE_NONE,
1179         ITOK_TYPE_GSS_FLAGS,
1180         GSSEAP_STATE_INITIATOR_EXTS,
1181         0,
1182         eapGssSmInitGssFlags
1183     },
1184     {
1185         ITOK_TYPE_NONE,
1186         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
1187         GSSEAP_STATE_INITIATOR_EXTS,
1188         0,
1189         eapGssSmInitGssChannelBindings
1190     },
1191     {
1192         ITOK_TYPE_NONE,
1193         ITOK_TYPE_INITIATOR_MIC,
1194         GSSEAP_STATE_INITIATOR_EXTS,
1195         SM_ITOK_FLAG_REQUIRED,
1196         eapGssSmInitInitiatorMIC
1197     },
1198 #ifdef GSSEAP_ENABLE_REAUTH
1199     {
1200         ITOK_TYPE_REAUTH_CREDS,
1201         ITOK_TYPE_NONE,
1202         GSSEAP_STATE_ACCEPTOR_EXTS,
1203         0,
1204         eapGssSmInitReauthCreds
1205     },
1206 #endif
1207     /* other extensions go here */
1208     {
1209         ITOK_TYPE_ACCEPTOR_MIC,
1210         ITOK_TYPE_NONE,
1211         GSSEAP_STATE_ACCEPTOR_EXTS,
1212         SM_ITOK_FLAG_REQUIRED,
1213         eapGssSmInitAcceptorMIC
1214     }
1215 };
1216
1217 OM_uint32
1218 gssEapInitSecContext(OM_uint32 *minor,
1219                      gss_cred_id_t cred,
1220                      gss_ctx_id_t ctx,
1221                      gss_const_name_t target_name,
1222                      gss_OID mech_type,
1223                      OM_uint32 req_flags,
1224                      OM_uint32 time_req,
1225                      gss_channel_bindings_t input_chan_bindings,
1226                      gss_buffer_t input_token,
1227                      gss_OID *actual_mech_type,
1228                      gss_buffer_t output_token,
1229                      OM_uint32 *ret_flags,
1230                      OM_uint32 *time_rec)
1231 {
1232     OM_uint32 major, tmpMinor;
1233     int initialContextToken = (ctx->mechanismUsed == GSS_C_NO_OID);
1234
1235     /*
1236      * XXX is acquiring the credential lock here necessary? The password is
1237      * mutable but the contract could specify that this is not updated whilst
1238      * a context is being initialized.
1239      */
1240     if (cred != GSS_C_NO_CREDENTIAL)
1241         GSSEAP_MUTEX_LOCK(&cred->mutex);
1242
1243     if (ctx->cred == GSS_C_NO_CREDENTIAL) {
1244         major = gssEapResolveInitiatorCred(minor, cred, target_name, &ctx->cred);
1245         if (GSS_ERROR(major))
1246             goto cleanup;
1247
1248         GSSEAP_ASSERT(ctx->cred != GSS_C_NO_CREDENTIAL);
1249     }
1250
1251     GSSEAP_MUTEX_LOCK(&ctx->cred->mutex);
1252
1253     GSSEAP_ASSERT(ctx->cred->flags & CRED_FLAG_RESOLVED);
1254     GSSEAP_ASSERT(ctx->cred->flags & CRED_FLAG_INITIATE);
1255
1256     if (initialContextToken) {
1257         major = initBegin(minor, ctx, target_name, mech_type,
1258                           req_flags, time_req, input_chan_bindings);
1259         if (GSS_ERROR(major))
1260             goto cleanup;
1261     }
1262
1263     major = gssEapSmStep(minor,
1264                          cred,
1265                          ctx,
1266                          target_name,
1267                          mech_type,
1268                          req_flags,
1269                          time_req,
1270                          input_chan_bindings,
1271                          input_token,
1272                          output_token,
1273                          eapGssInitiatorSm,
1274                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
1275     if (GSS_ERROR(major))
1276         goto cleanup;
1277
1278     if (actual_mech_type != NULL) {
1279         OM_uint32 tmpMajor;
1280
1281         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, actual_mech_type);
1282         if (GSS_ERROR(tmpMajor)) {
1283             major = tmpMajor;
1284             *minor = tmpMinor;
1285             goto cleanup;
1286         }
1287     }
1288
1289     if (ret_flags != NULL)
1290         *ret_flags = ctx->gssFlags;
1291
1292     if (time_rec != NULL)
1293         gssEapContextTime(&tmpMinor, ctx, time_rec);
1294
1295     GSSEAP_ASSERT(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1296
1297 cleanup:
1298     if (cred != GSS_C_NO_CREDENTIAL)
1299         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1300     if (ctx->cred != GSS_C_NO_CREDENTIAL)
1301         GSSEAP_MUTEX_UNLOCK(&ctx->cred->mutex);
1302
1303     return major;
1304 }
1305
1306 OM_uint32 GSSAPI_CALLCONV
1307 gss_init_sec_context(OM_uint32 *minor,
1308 #ifdef HAVE_HEIMDAL_VERSION
1309                      gss_const_cred_id_t cred,
1310 #else
1311                      gss_cred_id_t cred,
1312 #endif
1313                      gss_ctx_id_t *context_handle,
1314 #ifdef HAVE_HEIMDAL_VERSION
1315                      gss_const_name_t target_name,
1316 #else
1317                      gss_name_t target_name,
1318 #endif
1319                      gss_OID mech_type,
1320                      OM_uint32 req_flags,
1321                      OM_uint32 time_req,
1322                      gss_channel_bindings_t input_chan_bindings,
1323                      gss_buffer_t input_token,
1324                      gss_OID *actual_mech_type,
1325                      gss_buffer_t output_token,
1326                      OM_uint32 *ret_flags,
1327                      OM_uint32 *time_rec)
1328 {
1329     OM_uint32 major, tmpMinor;
1330     gss_ctx_id_t ctx = *context_handle;
1331
1332     *minor = 0;
1333
1334     output_token->length = 0;
1335     output_token->value = NULL;
1336
1337     if (ctx == GSS_C_NO_CONTEXT) {
1338         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
1339             *minor = GSSEAP_WRONG_SIZE;
1340             return GSS_S_DEFECTIVE_TOKEN;
1341         }
1342
1343         major = gssEapAllocContext(minor, &ctx);
1344         if (GSS_ERROR(major))
1345             return major;
1346
1347         ctx->flags |= CTX_FLAG_INITIATOR;
1348
1349         *context_handle = ctx;
1350     }
1351
1352     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1353
1354     major = gssEapInitSecContext(minor,
1355                                  (gss_cred_id_t)cred,
1356                                  ctx,
1357                                  target_name,
1358                                  mech_type,
1359                                  req_flags,
1360                                  time_req,
1361                                  input_chan_bindings,
1362                                  input_token,
1363                                  actual_mech_type,
1364                                  output_token,
1365                                  ret_flags,
1366                                  time_rec);
1367
1368     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1369
1370     if (GSS_ERROR(major))
1371         gssEapReleaseContext(&tmpMinor, context_handle);
1372
1373     gssEapTraceStatus("gss_init_sec_context", major, *minor);
1374
1375     return major;
1376 }