crypto/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 = 0;
  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         UNREACHABLE(return GSS_S_FAILURE);
 138     }
 139
 140     ret = gss_encapsulate_token(&data, GSS_SPNEGO_MECHANISM, output_token);
 141
 142     free (data.value);
 143
 144     if (ret != GSS_S_COMPLETE)
 145         return ret;
 146
 147     *minor_status = 0;
 148
 149     return GSS_S_CONTINUE_NEEDED;
 150 }
 151
 152 static OM_uint32
 153 send_accept (OM_uint32 *minor_status,
 154              gssspnego_ctx context_handle,
 155              gss_buffer_t mech_token,
 156              int initial_response,
 157              gss_buffer_t mech_buf,
 158              gss_buffer_t output_token)
 159 {
 160     NegotiationToken nt;
 161     OM_uint32 ret;
 162     gss_buffer_desc mech_mic_buf;
 163     size_t size;
 164
 165     memset(&nt, 0, sizeof(nt));
 166
 167     nt.element = choice_NegotiationToken_negTokenResp;
 168
 169     ALLOC(nt.u.negTokenResp.negResult, 1);
 170     if (nt.u.negTokenResp.negResult == NULL) {
 171         *minor_status = ENOMEM;
 172         return GSS_S_FAILURE;
 173     }
 174
 175     if (context_handle->open) {
 176         if (mech_token != GSS_C_NO_BUFFER
 177             && mech_token->length != 0
 178             && mech_buf != GSS_C_NO_BUFFER)
 179             *(nt.u.negTokenResp.negResult)  = accept_incomplete;
 180         else
 181             *(nt.u.negTokenResp.negResult)  = accept_completed;
 182     } else {
 183         if (initial_response && context_handle->require_mic)
 184             *(nt.u.negTokenResp.negResult)  = request_mic;
 185         else
 186             *(nt.u.negTokenResp.negResult)  = accept_incomplete;
 187     }
 188
 189     if (initial_response) {
 190         ALLOC(nt.u.negTokenResp.supportedMech, 1);
 191         if (nt.u.negTokenResp.supportedMech == NULL) {
 192             free_NegotiationToken(&nt);
 193             *minor_status = ENOMEM;
 194             return GSS_S_FAILURE;
 195         }
 196
 197         ret = der_get_oid(context_handle->preferred_mech_type->elements,
 198                           context_handle->preferred_mech_type->length,
 199                           nt.u.negTokenResp.supportedMech,
 200                           NULL);
 201         if (ret) {
 202             free_NegotiationToken(&nt);
 203             *minor_status = ENOMEM;
 204             return GSS_S_FAILURE;
 205         }
 206     } else {
 207         nt.u.negTokenResp.supportedMech = NULL;
 208     }
 209
 210     if (mech_token != GSS_C_NO_BUFFER && mech_token->length != 0) {
 211         ALLOC(nt.u.negTokenResp.responseToken, 1);
 212         if (nt.u.negTokenResp.responseToken == NULL) {
 213             free_NegotiationToken(&nt);
 214             *minor_status = ENOMEM;
 215             return GSS_S_FAILURE;
 216         }
 217         nt.u.negTokenResp.responseToken->length = mech_token->length;
 218         nt.u.negTokenResp.responseToken->data   = mech_token->value;
 219         mech_token->length = 0;
 220         mech_token->value  = NULL;
 221     } else {
 222         nt.u.negTokenResp.responseToken = NULL;
 223     }
 224
 225     if (mech_buf != GSS_C_NO_BUFFER) {
 226         ret = gss_get_mic(minor_status,
 227                           context_handle->negotiated_ctx_id,
 228                           0,
 229                           mech_buf,
 230                           &mech_mic_buf);
 231         if (ret == GSS_S_COMPLETE) {
 232             ALLOC(nt.u.negTokenResp.mechListMIC, 1);
 233             if (nt.u.negTokenResp.mechListMIC == NULL) {
 234                 gss_release_buffer(minor_status, &mech_mic_buf);
 235                 free_NegotiationToken(&nt);
 236                 *minor_status = ENOMEM;
 237                 return GSS_S_FAILURE;
 238             }
 239             nt.u.negTokenResp.mechListMIC->length = mech_mic_buf.length;
 240             nt.u.negTokenResp.mechListMIC->data   = mech_mic_buf.value;
 241         } else if (ret == GSS_S_UNAVAILABLE) {
 242             nt.u.negTokenResp.mechListMIC = NULL;
 243         } else {
 244             free_NegotiationToken(&nt);
 245             return ret;
 246         }
 247
 248     } else
 249         nt.u.negTokenResp.mechListMIC = NULL;
 250
 251     ASN1_MALLOC_ENCODE(NegotiationToken,
 252                        output_token->value, output_token->length,
 253                        &nt, &size, ret);
 254     if (ret) {
 255         free_NegotiationToken(&nt);
 256         *minor_status = ret;
 257         return GSS_S_FAILURE;
 258     }
 259
 260     /*
 261      * The response should not be encapsulated, because
 262      * it is a SubsequentContextToken (note though RFC 1964
 263      * specifies encapsulation for all _Kerberos_ tokens).
 264      */
 265
 266     if (*(nt.u.negTokenResp.negResult) == accept_completed)
 267         ret = GSS_S_COMPLETE;
 268     else
 269         ret = GSS_S_CONTINUE_NEEDED;
 270     free_NegotiationToken(&nt);
 271     return ret;
 272 }
 273
 274
 275 static OM_uint32
 276 verify_mechlist_mic
 277            (OM_uint32 *minor_status,
 278             gssspnego_ctx context_handle,
 279             gss_buffer_t mech_buf,
 280             heim_octet_string *mechListMIC
 281            )
 282 {
 283     OM_uint32 ret;
 284     gss_buffer_desc mic_buf;
 285
 286     if (context_handle->verified_mic) {
 287         /* This doesn't make sense, we've already verified it? */
 288         *minor_status = 0;
 289         return GSS_S_DUPLICATE_TOKEN;
 290     }
 291
 292     if (mechListMIC == NULL) {
 293         *minor_status = 0;
 294         return GSS_S_DEFECTIVE_TOKEN;
 295     }
 296
 297     mic_buf.length = mechListMIC->length;
 298     mic_buf.value  = mechListMIC->data;
 299
 300     ret = gss_verify_mic(minor_status,
 301                          context_handle->negotiated_ctx_id,
 302                          mech_buf,
 303                          &mic_buf,
 304                          NULL);
 305
 306     if (ret != GSS_S_COMPLETE)
 307         ret = GSS_S_DEFECTIVE_TOKEN;
 308
 309     return ret;
 310 }
 311
 312 static OM_uint32
 313 select_mech(OM_uint32 *minor_status, MechType *mechType, int verify_p,
 314             gss_OID *mech_p)
 315 {
 316     char mechbuf[64];
 317     size_t mech_len;
 318     gss_OID_desc oid;
 319     gss_OID oidp;
 320     gss_OID_set mechs;
 321     size_t i;
 322     OM_uint32 ret, junk;
 323
 324     ret = der_put_oid ((unsigned char *)mechbuf + sizeof(mechbuf) - 1,
 325                        sizeof(mechbuf),
 326                        mechType,
 327                        &mech_len);
 328     if (ret) {
 329         return GSS_S_DEFECTIVE_TOKEN;
 330     }
 331
 332     oid.length   = mech_len;
 333     oid.elements = mechbuf + sizeof(mechbuf) - mech_len;
 334
 335     if (gss_oid_equal(&oid, GSS_SPNEGO_MECHANISM)) {
 336         return GSS_S_BAD_MECH;
 337     }
 338
 339     *minor_status = 0;
 340
 341     /* Translate broken MS Kebreros OID */
 342     if (gss_oid_equal(&oid, &_gss_spnego_mskrb_mechanism_oid_desc))
 343             oidp = &_gss_spnego_krb5_mechanism_oid_desc;
 344     else
 345             oidp = &oid;
 346
 347
 348     ret = gss_indicate_mechs(&junk, &mechs);
 349     if (ret)
 350             return (ret);
 351
 352     for (i = 0; i < mechs->count; i++)
 353             if (gss_oid_equal(&mechs->elements[i], oidp))
 354                     break;
 355
 356     if (i == mechs->count) {
 357             gss_release_oid_set(&junk, &mechs);
 358             return GSS_S_BAD_MECH;
 359     }
 360     gss_release_oid_set(&junk, &mechs);
 361
 362     ret = gss_duplicate_oid(minor_status,
 363                             &oid, /* possibly this should be oidp */
 364                             mech_p);
 365
 366     if (verify_p) {
 367         gss_name_t name = GSS_C_NO_NAME;
 368         gss_buffer_desc namebuf;
 369         char *str = NULL, *host, hostname[MAXHOSTNAMELEN];
 370
 371         host = getenv("GSSAPI_SPNEGO_NAME");
 372         if (host == NULL || issuid()) {
 373             int rv;
 374             if (gethostname(hostname, sizeof(hostname)) != 0) {
 375                 *minor_status = errno;
 376                 return GSS_S_FAILURE;
 377             }
 378             rv = asprintf(&str, "host@%s", hostname);
 379             if (rv < 0 || str == NULL) {
 380                 *minor_status = ENOMEM;
 381                 return GSS_S_FAILURE;
 382             }
 383             host = str;
 384         }
 385
 386         namebuf.length = strlen(host);
 387         namebuf.value = host;
 388
 389         ret = gss_import_name(minor_status, &namebuf,
 390                               GSS_C_NT_HOSTBASED_SERVICE, &name);
 391         if (str)
 392             free(str);
 393         if (ret != GSS_S_COMPLETE)
 394             return ret;
 395
 396         ret = acceptor_approved(name, *mech_p);
 397         gss_release_name(&junk, &name);
 398     }
 399
 400     return ret;
 401 }
 402
 403
 404 static OM_uint32
 405 acceptor_complete(OM_uint32 * minor_status,
 406                   gssspnego_ctx ctx,
 407                   int *get_mic,
 408                   gss_buffer_t mech_buf,
 409                   gss_buffer_t mech_input_token,
 410                   gss_buffer_t mech_output_token,
 411                   heim_octet_string *mic,
 412                   gss_buffer_t output_token)
 413 {
 414     OM_uint32 ret;
 415     int require_mic, verify_mic;
 416
 417     ret = _gss_spnego_require_mechlist_mic(minor_status, ctx, &require_mic);
 418     if (ret)
 419         return ret;
 420
 421     ctx->require_mic = require_mic;
 422
 423     if (mic != NULL)
 424         require_mic = 1;
 425
 426     if (ctx->open && require_mic) {
 427         if (mech_input_token == GSS_C_NO_BUFFER) { /* Even/One */
 428             verify_mic = 1;
 429             *get_mic = 0;
 430         } else if (mech_output_token != GSS_C_NO_BUFFER &&
 431                    mech_output_token->length == 0) { /* Odd */
 432             *get_mic = verify_mic = 1;
 433         } else { /* Even/One */
 434             verify_mic = 0;
 435             *get_mic = 1;
 436         }
 437
 438         if (verify_mic || *get_mic) {
 439             int eret;
 440             size_t buf_len = 0;
 441
 442             ASN1_MALLOC_ENCODE(MechTypeList,
 443                                mech_buf->value, mech_buf->length,
 444                                &ctx->initiator_mech_types, &buf_len, eret);
 445             if (eret) {
 446                 *minor_status = eret;
 447                 return GSS_S_FAILURE;
 448             }
 449             heim_assert(mech_buf->length == buf_len, "Internal ASN.1 error");
 450             UNREACHABLE(return GSS_S_FAILURE);
 451         }
 452
 453         if (verify_mic) {
 454             ret = verify_mechlist_mic(minor_status, ctx, mech_buf, mic);
 455             if (ret) {
 456                 if (*get_mic)
 457                     send_reject (minor_status, output_token);
 458                 return ret;
 459             }
 460             ctx->verified_mic = 1;
 461         }
 462     } else
 463         *get_mic = 0;
 464
 465     return GSS_S_COMPLETE;
 466 }
 467
 468
 469 static OM_uint32 GSSAPI_CALLCONV
 470 acceptor_start
 471            (OM_uint32 * minor_status,
 472             gss_ctx_id_t * context_handle,
 473             const gss_cred_id_t acceptor_cred_handle,
 474             const gss_buffer_t input_token_buffer,
 475             const gss_channel_bindings_t input_chan_bindings,
 476             gss_name_t * src_name,
 477             gss_OID * mech_type,
 478             gss_buffer_t output_token,
 479             OM_uint32 * ret_flags,
 480             OM_uint32 * time_rec,
 481             gss_cred_id_t *delegated_cred_handle
 482            )
 483 {
 484     OM_uint32 ret, junk;
 485     NegotiationToken nt;
 486     size_t nt_len;
 487     NegTokenInit *ni;
 488     gss_buffer_desc data;
 489     gss_buffer_t mech_input_token = GSS_C_NO_BUFFER;
 490     gss_buffer_desc mech_output_token;
 491     gss_buffer_desc mech_buf;
 492     gss_OID preferred_mech_type = GSS_C_NO_OID;
 493     gssspnego_ctx ctx;
 494     int get_mic = 0;
 495     int first_ok = 0;
 496
 497     mech_output_token.value = NULL;
 498     mech_output_token.length = 0;
 499     mech_buf.value = NULL;
 500
 501     if (input_token_buffer->length == 0)
 502         return send_supported_mechs (minor_status, output_token);
 503
 504     ret = _gss_spnego_alloc_sec_context(minor_status, context_handle);
 505     if (ret != GSS_S_COMPLETE)
 506         return ret;
 507
 508     ctx = (gssspnego_ctx)*context_handle;
 509
 510     /*
 511      * The GSS-API encapsulation is only present on the initial
 512      * context token (negTokenInit).
 513      */
 514     ret = gss_decapsulate_token (input_token_buffer,
 515                                  GSS_SPNEGO_MECHANISM,
 516                                  &data);
 517     if (ret)
 518         return ret;
 519
 520     ret = decode_NegotiationToken(data.value, data.length, &nt, &nt_len);
 521     gss_release_buffer(minor_status, &data);
 522     if (ret) {
 523         *minor_status = ret;
 524         return GSS_S_DEFECTIVE_TOKEN;
 525     }
 526     if (nt.element != choice_NegotiationToken_negTokenInit) {
 527         *minor_status = 0;
 528         return GSS_S_DEFECTIVE_TOKEN;
 529     }
 530     ni = &nt.u.negTokenInit;
 531
 532     if (ni->mechTypes.len < 1) {
 533         free_NegotiationToken(&nt);
 534         *minor_status = 0;
 535         return GSS_S_DEFECTIVE_TOKEN;
 536     }
 537
 538     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
 539
 540     ret = copy_MechTypeList(&ni->mechTypes, &ctx->initiator_mech_types);
 541     if (ret) {
 542         HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 543         free_NegotiationToken(&nt);
 544         *minor_status = ret;
 545         return GSS_S_FAILURE;
 546     }
 547
 548     /*
 549      * First we try the opportunistic token if we have support for it,
 550      * don't try to verify we have credential for the token,
 551      * gss_accept_sec_context() will (hopefully) tell us that.
 552      * If that failes,
 553      */
 554
 555     ret = select_mech(minor_status,
 556                       &ni->mechTypes.val[0],
 557                       0,
 558                       &preferred_mech_type);
 559
 560     if (ret == 0 && ni->mechToken != NULL) {
 561         gss_buffer_desc ibuf;
 562
 563         ibuf.length = ni->mechToken->length;
 564         ibuf.value = ni->mechToken->data;
 565         mech_input_token = &ibuf;
 566
 567         if (ctx->mech_src_name != GSS_C_NO_NAME)
 568             gss_release_name(&junk, &ctx->mech_src_name);
 569
 570         ret = gss_accept_sec_context(minor_status,
 571                                      &ctx->negotiated_ctx_id,
 572                                      acceptor_cred_handle,
 573                                      mech_input_token,
 574                                      input_chan_bindings,
 575                                      &ctx->mech_src_name,
 576                                      &ctx->negotiated_mech_type,
 577                                      &mech_output_token,
 578                                      &ctx->mech_flags,
 579                                      &ctx->mech_time_rec,
 580                                      delegated_cred_handle);
 581
 582         if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
 583             ctx->preferred_mech_type = preferred_mech_type;
 584             if (ret == GSS_S_COMPLETE)
 585                 ctx->open = 1;
 586
 587             ret = acceptor_complete(minor_status,
 588                                     ctx,
 589                                     &get_mic,
 590                                     &mech_buf,
 591                                     mech_input_token,
 592                                     &mech_output_token,
 593                                     ni->mechListMIC,
 594                                     output_token);
 595             if (ret != GSS_S_COMPLETE)
 596                 goto out;
 597
 598             first_ok = 1;
 599         } else {
 600             gss_mg_collect_error(preferred_mech_type, ret, *minor_status);
 601         }
 602     }
 603
 604     /*
 605      * If opportunistic token failed, lets try the other mechs.
 606      */
 607
 608     if (!first_ok && ni->mechToken != NULL) {
 609         size_t j;
 610
 611         preferred_mech_type = GSS_C_NO_OID;
 612
 613         /* Call glue layer to find first mech we support */
 614         for (j = 1; j < ni->mechTypes.len; ++j) {
 615             ret = select_mech(minor_status,
 616                               &ni->mechTypes.val[j],
 617                               1,
 618                               &preferred_mech_type);
 619             if (ret == 0)
 620                 break;
 621         }
 622     }
 623
 624     ctx->preferred_mech_type = preferred_mech_type;
 625
 626     if (preferred_mech_type == GSS_C_NO_OID) {
 627         send_reject(minor_status, output_token);
 628         HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 629         free_NegotiationToken(&nt);
 630         return ret;
 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 GSSAPI_CALLCONV
 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 GSSAPI_CALLCONV
 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 }