source4/heimdal/lib/gssapi/spnego/accept_sec_context.c

   1 /*
   2  * Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * Portions Copyright (c) 2004 PADL Software Pty Ltd.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "spnego_locl.h"
  35
  36 static OM_uint32
  37 send_reject (OM_uint32 *minor_status,
  38              gss_buffer_t output_token)
  39 {
  40     NegotiationToken nt;
  41     size_t size;
  42
  43     nt.element = choice_NegotiationToken_negTokenResp;
  44
  45     ALLOC(nt.u.negTokenResp.negResult, 1);
  46     if (nt.u.negTokenResp.negResult == NULL) {
  47         *minor_status = ENOMEM;
  48         return GSS_S_FAILURE;
  49     }
  50     *(nt.u.negTokenResp.negResult)  = reject;
  51     nt.u.negTokenResp.supportedMech = NULL;
  52     nt.u.negTokenResp.responseToken = NULL;
  53     nt.u.negTokenResp.mechListMIC   = NULL;
  54
  55     ASN1_MALLOC_ENCODE(NegotiationToken,
  56                        output_token->value, output_token->length, &nt,
  57                        &size, *minor_status);
  58     free_NegotiationToken(&nt);
  59     if (*minor_status != 0)
  60         return GSS_S_FAILURE;
  61
  62     return GSS_S_BAD_MECH;
  63 }
  64
  65 static OM_uint32
  66 acceptor_approved(gss_name_t target_name, gss_OID mech)
  67 {
  68     gss_cred_id_t cred = GSS_C_NO_CREDENTIAL;
  69     gss_OID_set oidset;
  70     OM_uint32 junk, ret;
  71
  72     if (target_name == GSS_C_NO_NAME)
  73         return GSS_S_COMPLETE;
  74
  75     gss_create_empty_oid_set(&junk, &oidset);
  76     gss_add_oid_set_member(&junk, mech, &oidset);
  77
  78     ret = gss_acquire_cred(&junk, target_name, GSS_C_INDEFINITE, oidset,
  79                            GSS_C_ACCEPT, &cred, NULL, NULL);
  80     gss_release_oid_set(&junk, &oidset);
  81     if (ret != GSS_S_COMPLETE)
  82         return ret;
  83     gss_release_cred(&junk, &cred);
  84
  85     return GSS_S_COMPLETE;
  86 }
  87
  88 static OM_uint32
  89 send_supported_mechs (OM_uint32 *minor_status,
  90                       gss_buffer_t output_token)
  91 {
  92     NegotiationTokenWin nt;
  93     size_t buf_len;
  94     gss_buffer_desc data;
  95     OM_uint32 ret;
  96
  97     memset(&nt, 0, sizeof(nt));
  98
  99     nt.element = choice_NegotiationTokenWin_negTokenInit;
 100     nt.u.negTokenInit.reqFlags = NULL;
 101     nt.u.negTokenInit.mechToken = NULL;
 102     nt.u.negTokenInit.negHints = NULL;
 103
 104     ret = _gss_spnego_indicate_mechtypelist(minor_status, GSS_C_NO_NAME,
 105                                             acceptor_approved, 1, NULL,
 106                                             &nt.u.negTokenInit.mechTypes, NULL);
 107     if (ret != GSS_S_COMPLETE) {
 108         return ret;
 109     }
 110
 111     ALLOC(nt.u.negTokenInit.negHints, 1);
 112     if (nt.u.negTokenInit.negHints == NULL) {
 113         *minor_status = ENOMEM;
 114         free_NegotiationTokenWin(&nt);
 115         return GSS_S_FAILURE;
 116     }
 117
 118     ALLOC(nt.u.negTokenInit.negHints->hintName, 1);
 119     if (nt.u.negTokenInit.negHints->hintName == NULL) {
 120         *minor_status = ENOMEM;
 121         free_NegotiationTokenWin(&nt);
 122         return GSS_S_FAILURE;
 123     }
 124
 125     *nt.u.negTokenInit.negHints->hintName = strdup("not_defined_in_RFC4178@please_ignore");
 126     nt.u.negTokenInit.negHints->hintAddress = NULL;
 127
 128     ASN1_MALLOC_ENCODE(NegotiationTokenWin,
 129                        data.value, data.length, &nt, &buf_len, ret);
 130     free_NegotiationTokenWin(&nt);
 131     if (ret) {
 132         *minor_status = ret;
 133         return GSS_S_FAILURE;
 134     }
 135     if (data.length != buf_len)
 136         abort();
 137
 138     ret = gss_encapsulate_token(&data, GSS_SPNEGO_MECHANISM, output_token);
 139
 140     free (data.value);
 141
 142     if (ret != GSS_S_COMPLETE)
 143         return ret;
 144
 145     *minor_status = 0;
 146
 147     return GSS_S_CONTINUE_NEEDED;
 148 }
 149
 150 static OM_uint32
 151 send_accept (OM_uint32 *minor_status,
 152              gssspnego_ctx context_handle,
 153              gss_buffer_t mech_token,
 154              int initial_response,
 155              gss_buffer_t mech_buf,
 156              gss_buffer_t output_token)
 157 {
 158     NegotiationToken nt;
 159     OM_uint32 ret;
 160     gss_buffer_desc mech_mic_buf;
 161     size_t size;
 162
 163     memset(&nt, 0, sizeof(nt));
 164
 165     nt.element = choice_NegotiationToken_negTokenResp;
 166
 167     ALLOC(nt.u.negTokenResp.negResult, 1);
 168     if (nt.u.negTokenResp.negResult == NULL) {
 169         *minor_status = ENOMEM;
 170         return GSS_S_FAILURE;
 171     }
 172
 173     if (context_handle->open) {
 174         if (mech_token != GSS_C_NO_BUFFER
 175             && mech_token->length != 0
 176             && mech_buf != GSS_C_NO_BUFFER)
 177             *(nt.u.negTokenResp.negResult)  = accept_incomplete;
 178         else
 179             *(nt.u.negTokenResp.negResult)  = accept_completed;
 180     } else {
 181         if (initial_response && context_handle->require_mic)
 182             *(nt.u.negTokenResp.negResult)  = request_mic;
 183         else
 184             *(nt.u.negTokenResp.negResult)  = accept_incomplete;
 185     }
 186
 187     if (initial_response) {
 188         ALLOC(nt.u.negTokenResp.supportedMech, 1);
 189         if (nt.u.negTokenResp.supportedMech == NULL) {
 190             free_NegotiationToken(&nt);
 191             *minor_status = ENOMEM;
 192             return GSS_S_FAILURE;
 193         }
 194
 195         ret = der_get_oid(context_handle->preferred_mech_type->elements,
 196                           context_handle->preferred_mech_type->length,
 197                           nt.u.negTokenResp.supportedMech,
 198                           NULL);
 199         if (ret) {
 200             free_NegotiationToken(&nt);
 201             *minor_status = ENOMEM;
 202             return GSS_S_FAILURE;
 203         }
 204     } else {
 205         nt.u.negTokenResp.supportedMech = NULL;
 206     }
 207
 208     if (mech_token != GSS_C_NO_BUFFER && mech_token->length != 0) {
 209         ALLOC(nt.u.negTokenResp.responseToken, 1);
 210         if (nt.u.negTokenResp.responseToken == NULL) {
 211             free_NegotiationToken(&nt);
 212             *minor_status = ENOMEM;
 213             return GSS_S_FAILURE;
 214         }
 215         nt.u.negTokenResp.responseToken->length = mech_token->length;
 216         nt.u.negTokenResp.responseToken->data   = mech_token->value;
 217         mech_token->length = 0;
 218         mech_token->value  = NULL;
 219     } else {
 220         nt.u.negTokenResp.responseToken = NULL;
 221     }
 222
 223     if (mech_buf != GSS_C_NO_BUFFER) {
 224         ret = gss_get_mic(minor_status,
 225                           context_handle->negotiated_ctx_id,
 226                           0,
 227                           mech_buf,
 228                           &mech_mic_buf);
 229         if (ret == GSS_S_COMPLETE) {
 230             ALLOC(nt.u.negTokenResp.mechListMIC, 1);
 231             if (nt.u.negTokenResp.mechListMIC == NULL) {
 232                 gss_release_buffer(minor_status, &mech_mic_buf);
 233                 free_NegotiationToken(&nt);
 234                 *minor_status = ENOMEM;
 235                 return GSS_S_FAILURE;
 236             }
 237             nt.u.negTokenResp.mechListMIC->length = mech_mic_buf.length;
 238             nt.u.negTokenResp.mechListMIC->data   = mech_mic_buf.value;
 239         } else if (ret == GSS_S_UNAVAILABLE) {
 240             nt.u.negTokenResp.mechListMIC = NULL;
 241         } else {
 242             free_NegotiationToken(&nt);
 243             return ret;
 244         }
 245
 246     } else
 247         nt.u.negTokenResp.mechListMIC = NULL;
 248
 249     ASN1_MALLOC_ENCODE(NegotiationToken,
 250                        output_token->value, output_token->length,
 251                        &nt, &size, ret);
 252     if (ret) {
 253         free_NegotiationToken(&nt);
 254         *minor_status = ret;
 255         return GSS_S_FAILURE;
 256     }
 257
 258     /*
 259      * The response should not be encapsulated, because
 260      * it is a SubsequentContextToken (note though RFC 1964
 261      * specifies encapsulation for all _Kerberos_ tokens).
 262      */
 263
 264     if (*(nt.u.negTokenResp.negResult) == accept_completed)
 265         ret = GSS_S_COMPLETE;
 266     else
 267         ret = GSS_S_CONTINUE_NEEDED;
 268     free_NegotiationToken(&nt);
 269     return ret;
 270 }
 271
 272
 273 static OM_uint32
 274 verify_mechlist_mic
 275            (OM_uint32 *minor_status,
 276             gssspnego_ctx context_handle,
 277             gss_buffer_t mech_buf,
 278             heim_octet_string *mechListMIC
 279            )
 280 {
 281     OM_uint32 ret;
 282     gss_buffer_desc mic_buf;
 283
 284     if (context_handle->verified_mic) {
 285         /* This doesn't make sense, we've already verified it? */
 286         *minor_status = 0;
 287         return GSS_S_DUPLICATE_TOKEN;
 288     }
 289
 290     if (mechListMIC == NULL) {
 291         *minor_status = 0;
 292         return GSS_S_DEFECTIVE_TOKEN;
 293     }
 294
 295     mic_buf.length = mechListMIC->length;
 296     mic_buf.value  = mechListMIC->data;
 297
 298     ret = gss_verify_mic(minor_status,
 299                          context_handle->negotiated_ctx_id,
 300                          mech_buf,
 301                          &mic_buf,
 302                          NULL);
 303
 304     if (ret != GSS_S_COMPLETE)
 305         ret = GSS_S_DEFECTIVE_TOKEN;
 306
 307     return ret;
 308 }
 309
 310 static OM_uint32
 311 select_mech(OM_uint32 *minor_status, MechType *mechType, int verify_p,
 312             gss_OID *mech_p)
 313 {
 314     char mechbuf[64];
 315     size_t mech_len;
 316     gss_OID_desc oid;
 317     gss_OID oidp;
 318     gss_OID_set mechs;
 319     int i;
 320     OM_uint32 ret, junk;
 321
 322     ret = der_put_oid ((unsigned char *)mechbuf + sizeof(mechbuf) - 1,
 323                        sizeof(mechbuf),
 324                        mechType,
 325                        &mech_len);
 326     if (ret) {
 327         return GSS_S_DEFECTIVE_TOKEN;
 328     }
 329
 330     oid.length   = mech_len;
 331     oid.elements = mechbuf + sizeof(mechbuf) - mech_len;
 332
 333     if (gss_oid_equal(&oid, GSS_SPNEGO_MECHANISM)) {
 334         return GSS_S_BAD_MECH;
 335     }
 336
 337     *minor_status = 0;
 338
 339     /* Translate broken MS Kebreros OID */
 340     if (gss_oid_equal(&oid, &_gss_spnego_mskrb_mechanism_oid_desc))
 341             oidp = &_gss_spnego_krb5_mechanism_oid_desc;
 342     else
 343             oidp = &oid;
 344
 345
 346     ret = gss_indicate_mechs(&junk, &mechs);
 347     if (ret)
 348             return (ret);
 349
 350     for (i = 0; i < mechs->count; i++)
 351             if (gss_oid_equal(&mechs->elements[i], oidp))
 352                     break;
 353
 354     if (i == mechs->count) {
 355             gss_release_oid_set(&junk, &mechs);
 356             return GSS_S_BAD_MECH;
 357     }
 358     gss_release_oid_set(&junk, &mechs);
 359
 360     ret = gss_duplicate_oid(minor_status,
 361                             &oid, /* possibly this should be oidp */
 362                             mech_p);
 363
 364     if (verify_p) {
 365         gss_name_t name = GSS_C_NO_NAME;
 366         gss_buffer_desc namebuf;
 367         char *str = NULL, *host, hostname[MAXHOSTNAMELEN];
 368
 369         host = getenv("GSSAPI_SPNEGO_NAME");
 370         if (host == NULL || issuid()) {
 371             if (gethostname(hostname, sizeof(hostname)) != 0) {
 372                 *minor_status = errno;
 373                 return GSS_S_FAILURE;
 374             }
 375             asprintf(&str, "host@%s", hostname);
 376             host = str;
 377         }
 378
 379         namebuf.length = strlen(host);
 380         namebuf.value = host;
 381
 382         ret = gss_import_name(minor_status, &namebuf,
 383                               GSS_C_NT_HOSTBASED_SERVICE, &name);
 384         if (str)
 385             free(str);
 386         if (ret != GSS_S_COMPLETE)
 387             return ret;
 388
 389         ret = acceptor_approved(name, *mech_p);
 390         gss_release_name(&junk, &name);
 391     }
 392
 393     return ret;
 394 }
 395
 396
 397 static OM_uint32
 398 acceptor_complete(OM_uint32 * minor_status,
 399                   gssspnego_ctx ctx,
 400                   int *get_mic,
 401                   gss_buffer_t mech_buf,
 402                   gss_buffer_t mech_input_token,
 403                   gss_buffer_t mech_output_token,
 404                   heim_octet_string *mic,
 405                   gss_buffer_t output_token)
 406 {
 407     OM_uint32 ret;
 408     int require_mic, verify_mic;
 409     gss_buffer_desc buf;
 410
 411     buf.length = 0;
 412     buf.value = NULL;
 413
 414     ret = _gss_spnego_require_mechlist_mic(minor_status, ctx, &require_mic);
 415     if (ret)
 416         return ret;
 417
 418     ctx->require_mic = require_mic;
 419
 420     if (mic != NULL)
 421         require_mic = 1;
 422
 423     if (ctx->open && require_mic) {
 424         if (mech_input_token == GSS_C_NO_BUFFER) { /* Even/One */
 425             verify_mic = 1;
 426             *get_mic = 0;
 427         } else if (mech_output_token != GSS_C_NO_BUFFER &&
 428                    mech_output_token->length == 0) { /* Odd */
 429             *get_mic = verify_mic = 1;
 430         } else { /* Even/One */
 431             verify_mic = 0;
 432             *get_mic = 1;
 433         }
 434
 435         if (verify_mic || *get_mic) {
 436             int eret;
 437             size_t buf_len;
 438
 439             ASN1_MALLOC_ENCODE(MechTypeList,
 440                                mech_buf->value, mech_buf->length,
 441                                &ctx->initiator_mech_types, &buf_len, eret);
 442             if (eret) {
 443                 *minor_status = eret;
 444                 return GSS_S_FAILURE;
 445             }
 446             if (buf.length != buf_len)
 447                 abort();
 448         }
 449
 450         if (verify_mic) {
 451             ret = verify_mechlist_mic(minor_status, ctx, mech_buf, mic);
 452             if (ret) {
 453                 if (*get_mic)
 454                     send_reject (minor_status, output_token);
 455                 if (buf.value)
 456                     free(buf.value);
 457                 return ret;
 458             }
 459             ctx->verified_mic = 1;
 460         }
 461         if (buf.value)
 462             free(buf.value);
 463
 464     } else
 465         *get_mic = 0;
 466
 467     return GSS_S_COMPLETE;
 468 }
 469
 470
 471 static OM_uint32
 472 acceptor_start
 473            (OM_uint32 * minor_status,
 474             gss_ctx_id_t * context_handle,
 475             const gss_cred_id_t acceptor_cred_handle,
 476             const gss_buffer_t input_token_buffer,
 477             const gss_channel_bindings_t input_chan_bindings,
 478             gss_name_t * src_name,
 479             gss_OID * mech_type,
 480             gss_buffer_t output_token,
 481             OM_uint32 * ret_flags,
 482             OM_uint32 * time_rec,
 483             gss_cred_id_t *delegated_cred_handle
 484            )
 485 {
 486     OM_uint32 ret, junk;
 487     NegotiationToken nt;
 488     size_t nt_len;
 489     NegTokenInit *ni;
 490     int i;
 491     gss_buffer_desc data;
 492     gss_buffer_t mech_input_token = GSS_C_NO_BUFFER;
 493     gss_buffer_desc mech_output_token;
 494     gss_buffer_desc mech_buf;
 495     gss_OID preferred_mech_type = GSS_C_NO_OID;
 496     gssspnego_ctx ctx;
 497     int get_mic = 0;
 498     int first_ok = 0;
 499
 500     mech_output_token.value = NULL;
 501     mech_output_token.length = 0;
 502     mech_buf.value = NULL;
 503
 504     if (input_token_buffer->length == 0)
 505         return send_supported_mechs (minor_status, output_token);
 506
 507     ret = _gss_spnego_alloc_sec_context(minor_status, context_handle);
 508     if (ret != GSS_S_COMPLETE)
 509         return ret;
 510
 511     ctx = (gssspnego_ctx)*context_handle;
 512
 513     /*
 514      * The GSS-API encapsulation is only present on the initial
 515      * context token (negTokenInit).
 516      */
 517     ret = gss_decapsulate_token (input_token_buffer,
 518                                  GSS_SPNEGO_MECHANISM,
 519                                  &data);
 520     if (ret)
 521         return ret;
 522
 523     ret = decode_NegotiationToken(data.value, data.length, &nt, &nt_len);
 524     gss_release_buffer(minor_status, &data);
 525     if (ret) {
 526         *minor_status = ret;
 527         return GSS_S_DEFECTIVE_TOKEN;
 528     }
 529     if (nt.element != choice_NegotiationToken_negTokenInit) {
 530         *minor_status = 0;
 531         return GSS_S_DEFECTIVE_TOKEN;
 532     }
 533     ni = &nt.u.negTokenInit;
 534
 535     if (ni->mechTypes.len < 1) {
 536         free_NegotiationToken(&nt);
 537         *minor_status = 0;
 538         return GSS_S_DEFECTIVE_TOKEN;
 539     }
 540
 541     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
 542
 543     ret = copy_MechTypeList(&ni->mechTypes, &ctx->initiator_mech_types);
 544     if (ret) {
 545         HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 546         free_NegotiationToken(&nt);
 547         *minor_status = ret;
 548         return GSS_S_FAILURE;
 549     }
 550
 551     /*
 552      * First we try the opportunistic token if we have support for it,
 553      * don't try to verify we have credential for the token,
 554      * gss_accept_sec_context() will (hopefully) tell us that.
 555      * If that failes,
 556      */
 557
 558     ret = select_mech(minor_status,
 559                       &ni->mechTypes.val[0],
 560                       0,
 561                       &preferred_mech_type);
 562
 563     if (ret == 0 && ni->mechToken != NULL) {
 564         gss_buffer_desc ibuf;
 565
 566         ibuf.length = ni->mechToken->length;
 567         ibuf.value = ni->mechToken->data;
 568         mech_input_token = &ibuf;
 569
 570         if (ctx->mech_src_name != GSS_C_NO_NAME)
 571             gss_release_name(&junk, &ctx->mech_src_name);
 572
 573         ret = gss_accept_sec_context(minor_status,
 574                                      &ctx->negotiated_ctx_id,
 575                                      acceptor_cred_handle,
 576                                      mech_input_token,
 577                                      input_chan_bindings,
 578                                      &ctx->mech_src_name,
 579                                      &ctx->negotiated_mech_type,
 580                                      &mech_output_token,
 581                                      &ctx->mech_flags,
 582                                      &ctx->mech_time_rec,
 583                                      delegated_cred_handle);
 584
 585         if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
 586             ctx->preferred_mech_type = preferred_mech_type;
 587             if (ret == GSS_S_COMPLETE)
 588                 ctx->open = 1;
 589
 590             ret = acceptor_complete(minor_status,
 591                                     ctx,
 592                                     &get_mic,
 593                                     &mech_buf,
 594                                     mech_input_token,
 595                                     &mech_output_token,
 596                                     ni->mechListMIC,
 597                                     output_token);
 598             if (ret != GSS_S_COMPLETE)
 599                 goto out;
 600
 601             first_ok = 1;
 602         } else {
 603             gss_mg_collect_error(preferred_mech_type, ret, *minor_status);
 604         }
 605     }
 606
 607     /*
 608      * If opportunistic token failed, lets try the other mechs.
 609      */
 610
 611     if (!first_ok && ni->mechToken != NULL) {
 612
 613         preferred_mech_type = GSS_C_NO_OID;
 614
 615         /* Call glue layer to find first mech we support */
 616         for (i = 1; i < ni->mechTypes.len; ++i) {
 617             ret = select_mech(minor_status,
 618                               &ni->mechTypes.val[i],
 619                               1,
 620                               &preferred_mech_type);
 621             if (ret == 0)
 622                 break;
 623         }
 624         if (preferred_mech_type == GSS_C_NO_OID) {
 625             HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 626             free_NegotiationToken(&nt);
 627             return ret;
 628         }
 629
 630         ctx->preferred_mech_type = preferred_mech_type;
 631     }
 632
 633     /*
 634      * The initial token always have a response
 635      */
 636
 637     ret = send_accept (minor_status,
 638                        ctx,
 639                        &mech_output_token,
 640                        1,
 641                        get_mic ? &mech_buf : NULL,
 642                        output_token);
 643     if (ret)
 644         goto out;
 645
 646 out:
 647     if (mech_output_token.value != NULL)
 648         gss_release_buffer(&junk, &mech_output_token);
 649     if (mech_buf.value != NULL) {
 650         free(mech_buf.value);
 651         mech_buf.value = NULL;
 652     }
 653     free_NegotiationToken(&nt);
 654
 655
 656     if (ret == GSS_S_COMPLETE) {
 657         if (src_name != NULL && ctx->mech_src_name != NULL) {
 658             spnego_name name;
 659
 660             name = calloc(1, sizeof(*name));
 661             if (name) {
 662                 name->mech = ctx->mech_src_name;
 663                 ctx->mech_src_name = NULL;
 664                 *src_name = (gss_name_t)name;
 665             }
 666         }
 667     }
 668
 669     if (mech_type != NULL)
 670         *mech_type = ctx->negotiated_mech_type;
 671     if (ret_flags != NULL)
 672         *ret_flags = ctx->mech_flags;
 673     if (time_rec != NULL)
 674         *time_rec = ctx->mech_time_rec;
 675
 676     if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
 677         HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 678         return ret;
 679     }
 680
 681     _gss_spnego_internal_delete_sec_context(&junk, context_handle,
 682                                             GSS_C_NO_BUFFER);
 683
 684     return ret;
 685 }
 686
 687
 688 static OM_uint32
 689 acceptor_continue
 690            (OM_uint32 * minor_status,
 691             gss_ctx_id_t * context_handle,
 692             const gss_cred_id_t acceptor_cred_handle,
 693             const gss_buffer_t input_token_buffer,
 694             const gss_channel_bindings_t input_chan_bindings,
 695             gss_name_t * src_name,
 696             gss_OID * mech_type,
 697             gss_buffer_t output_token,
 698             OM_uint32 * ret_flags,
 699             OM_uint32 * time_rec,
 700             gss_cred_id_t *delegated_cred_handle
 701            )
 702 {
 703     OM_uint32 ret, ret2, minor;
 704     NegotiationToken nt;
 705     size_t nt_len;
 706     NegTokenResp *na;
 707     unsigned int negResult = accept_incomplete;
 708     gss_buffer_t mech_input_token = GSS_C_NO_BUFFER;
 709     gss_buffer_t mech_output_token = GSS_C_NO_BUFFER;
 710     gss_buffer_desc mech_buf;
 711     gssspnego_ctx ctx;
 712
 713     mech_buf.value = NULL;
 714
 715     ctx = (gssspnego_ctx)*context_handle;
 716
 717     /*
 718      * The GSS-API encapsulation is only present on the initial
 719      * context token (negTokenInit).
 720      */
 721
 722     ret = decode_NegotiationToken(input_token_buffer->value,
 723                                   input_token_buffer->length,
 724                                   &nt, &nt_len);
 725     if (ret) {
 726         *minor_status = ret;
 727         return GSS_S_DEFECTIVE_TOKEN;
 728     }
 729     if (nt.element != choice_NegotiationToken_negTokenResp) {
 730         *minor_status = 0;
 731         return GSS_S_DEFECTIVE_TOKEN;
 732     }
 733     na = &nt.u.negTokenResp;
 734
 735     if (na->negResult != NULL) {
 736         negResult = *(na->negResult);
 737     }
 738
 739     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
 740
 741     {
 742         gss_buffer_desc ibuf, obuf;
 743         int require_mic, get_mic = 0;
 744         int require_response;
 745         heim_octet_string *mic;
 746
 747         if (na->responseToken != NULL) {
 748             ibuf.length = na->responseToken->length;
 749             ibuf.value = na->responseToken->data;
 750             mech_input_token = &ibuf;
 751         } else {
 752             ibuf.value = NULL;
 753             ibuf.length = 0;
 754         }
 755
 756         if (mech_input_token != GSS_C_NO_BUFFER) {
 757
 758             if (ctx->mech_src_name != GSS_C_NO_NAME)
 759                 gss_release_name(&minor, &ctx->mech_src_name);
 760
 761             ret = gss_accept_sec_context(&minor,
 762                                          &ctx->negotiated_ctx_id,
 763                                          acceptor_cred_handle,
 764                                          mech_input_token,
 765                                          input_chan_bindings,
 766                                          &ctx->mech_src_name,
 767                                          &ctx->negotiated_mech_type,
 768                                          &obuf,
 769                                          &ctx->mech_flags,
 770                                          &ctx->mech_time_rec,
 771                                          delegated_cred_handle);
 772
 773             if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
 774                 mech_output_token = &obuf;
 775             }
 776             if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
 777                 free_NegotiationToken(&nt);
 778                 gss_mg_collect_error(ctx->negotiated_mech_type, ret, minor);
 779                 send_reject (minor_status, output_token);
 780                 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 781                 return ret;
 782             }
 783             if (ret == GSS_S_COMPLETE)
 784                 ctx->open = 1;
 785         } else
 786             ret = GSS_S_COMPLETE;
 787
 788         ret2 = _gss_spnego_require_mechlist_mic(minor_status,
 789                                                 ctx,
 790                                                 &require_mic);
 791         if (ret2)
 792             goto out;
 793
 794         ctx->require_mic = require_mic;
 795
 796         mic = na->mechListMIC;
 797         if (mic != NULL)
 798             require_mic = 1;
 799
 800         if (ret == GSS_S_COMPLETE)
 801             ret = acceptor_complete(minor_status,
 802                                     ctx,
 803                                     &get_mic,
 804                                     &mech_buf,
 805                                     mech_input_token,
 806                                     mech_output_token,
 807                                     na->mechListMIC,
 808                                     output_token);
 809
 810         if (ctx->mech_flags & GSS_C_DCE_STYLE)
 811             require_response = (negResult != accept_completed);
 812         else
 813             require_response = 0;
 814
 815         /*
 816          * Check whether we need to send a result: there should be only
 817          * one accept_completed response sent in the entire negotiation
 818          */
 819         if ((mech_output_token != GSS_C_NO_BUFFER &&
 820              mech_output_token->length != 0)
 821             || (ctx->open && negResult == accept_incomplete)
 822             || require_response
 823             || get_mic) {
 824             ret2 = send_accept (minor_status,
 825                                 ctx,
 826                                 mech_output_token,
 827                                 0,
 828                                 get_mic ? &mech_buf : NULL,
 829                                 output_token);
 830             if (ret2)
 831                 goto out;
 832         }
 833
 834      out:
 835         if (ret2 != GSS_S_COMPLETE)
 836             ret = ret2;
 837         if (mech_output_token != NULL)
 838             gss_release_buffer(&minor, mech_output_token);
 839         if (mech_buf.value != NULL)
 840             free(mech_buf.value);
 841         free_NegotiationToken(&nt);
 842     }
 843
 844     if (ret == GSS_S_COMPLETE) {
 845         if (src_name != NULL && ctx->mech_src_name != NULL) {
 846             spnego_name name;
 847
 848             name = calloc(1, sizeof(*name));
 849             if (name) {
 850                 name->mech = ctx->mech_src_name;
 851                 ctx->mech_src_name = NULL;
 852                 *src_name = (gss_name_t)name;
 853             }
 854         }
 855     }
 856
 857     if (mech_type != NULL)
 858         *mech_type = ctx->negotiated_mech_type;
 859     if (ret_flags != NULL)
 860         *ret_flags = ctx->mech_flags;
 861     if (time_rec != NULL)
 862         *time_rec = ctx->mech_time_rec;
 863
 864     if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
 865         HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 866         return ret;
 867     }
 868
 869     _gss_spnego_internal_delete_sec_context(&minor, context_handle,
 870                                    GSS_C_NO_BUFFER);
 871
 872     return ret;
 873 }
 874
 875 OM_uint32
 876 _gss_spnego_accept_sec_context
 877            (OM_uint32 * minor_status,
 878             gss_ctx_id_t * context_handle,
 879             const gss_cred_id_t acceptor_cred_handle,
 880             const gss_buffer_t input_token_buffer,
 881             const gss_channel_bindings_t input_chan_bindings,
 882             gss_name_t * src_name,
 883             gss_OID * mech_type,
 884             gss_buffer_t output_token,
 885             OM_uint32 * ret_flags,
 886             OM_uint32 * time_rec,
 887             gss_cred_id_t *delegated_cred_handle
 888            )
 889 {
 890     _gss_accept_sec_context_t *func;
 891
 892     *minor_status = 0;
 893
 894     output_token->length = 0;
 895     output_token->value  = NULL;
 896
 897     if (src_name != NULL)
 898         *src_name = GSS_C_NO_NAME;
 899     if (mech_type != NULL)
 900         *mech_type = GSS_C_NO_OID;
 901     if (ret_flags != NULL)
 902         *ret_flags = 0;
 903     if (time_rec != NULL)
 904         *time_rec = 0;
 905     if (delegated_cred_handle != NULL)
 906         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 907
 908
 909     if (*context_handle == GSS_C_NO_CONTEXT)
 910         func = acceptor_start;
 911     else
 912         func = acceptor_continue;
 913
 914
 915     return (*func)(minor_status, context_handle, acceptor_cred_handle,
 916                    input_token_buffer, input_chan_bindings,
 917                    src_name, mech_type, output_token, ret_flags,
 918                    time_rec, delegated_cred_handle);
 919 }