mech_eap/init_sec_context.c

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