lib/libtelnet/kerberos5.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  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  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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  * $FreeBSD: src/crypto/telnet/libtelnet/kerberos5.c,v 1.1.1.1.8.2 2003/04/24 19:13:59 nectar Exp $
  34  * $DragonFly: src/crypto/telnet/libtelnet/kerberos5.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
  35  */
  36
  37 /*
  38  * Copyright (C) 1990 by the Massachusetts Institute of Technology
  39  *
  40  * Export of this software from the United States of America may
  41  * require a specific license from the United States Government.
  42  * It is the responsibility of any person or organization contemplating
  43  * export to obtain such a license before exporting.
  44  *
  45  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
  46  * distribute this software and its documentation for any purpose and
  47  * without fee is hereby granted, provided that the above copyright
  48  * notice appear in all copies and that both that copyright notice and
  49  * this permission notice appear in supporting documentation, and that
  50  * the name of M.I.T. not be used in advertising or publicity pertaining
  51  * to distribution of the software without specific, written prior
  52  * permission.  M.I.T. makes no representations about the suitability of
  53  * this software for any purpose.  It is provided "as is" without express
  54  * or implied warranty.
  55  */
  56
  57 #ifdef  KRB5
  58
  59 #include <arpa/telnet.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64 #include <netdb.h>
  65 #include <ctype.h>
  66 #include <pwd.h>
  67 #define Authenticator k5_Authenticator
  68 #include <krb5.h>
  69 #undef Authenticator
  70
  71 #include "encrypt.h"
  72 #include "auth.h"
  73 #include "misc.h"
  74
  75 int forward_flags = 0;  /* Flags get set in telnet/main.c on -f and -F */
  76
  77 /* These values need to be the same as those defined in telnet/main.c. */
  78 /* Either define them in both places, or put in some common header file. */
  79 #define OPTS_FORWARD_CREDS      0x00000002
  80 #define OPTS_FORWARDABLE_CREDS  0x00000001
  81
  82 void kerberos5_forward (Authenticator *);
  83
  84 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
  85                                         AUTHTYPE_KERBEROS_V5, };
  86
  87 #define KRB_AUTH                0       /* Authentication data follows */
  88 #define KRB_REJECT              1       /* Rejected (reason might follow) */
  89 #define KRB_ACCEPT              2       /* Accepted */
  90 #define KRB_RESPONSE            3       /* Response for mutual auth. */
  91
  92 #define KRB_FORWARD             4       /* Forwarded credentials follow */
  93 #define KRB_FORWARD_ACCEPT      5       /* Forwarded credentials accepted */
  94 #define KRB_FORWARD_REJECT      6       /* Forwarded credentials rejected */
  95
  96 static  krb5_data auth;
  97 static  krb5_ticket *ticket;
  98
  99 static krb5_context context;
 100 static krb5_auth_context auth_context;
 101
 102 static int
 103 Data(Authenticator *ap, int type, const char *d, int c)
 104 {
 105     unsigned char *p = str_data + 4;
 106     const unsigned char *cd = d;
 107
 108     if (c == -1)
 109         c = strlen(cd);
 110
 111     if (auth_debug_mode) {
 112         printf("%s:%d: [%d] (%d)",
 113                str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
 114                str_data[3],
 115                type, c);
 116         printd(d, c);
 117         printf("\r\n");
 118     }
 119     *p++ = ap->type;
 120     *p++ = ap->way;
 121     *p++ = type;
 122     while (c-- > 0) {
 123         if ((*p++ = *cd++) == IAC)
 124             *p++ = IAC;
 125     }
 126     *p++ = IAC;
 127     *p++ = SE;
 128     if (str_data[3] == TELQUAL_IS)
 129         printsub('>', &str_data[2], p - &str_data[2]);
 130     return(net_write(str_data, p - str_data));
 131 }
 132
 133 int
 134 kerberos5_init(Authenticator *ap __unused, int server)
 135 {
 136     krb5_error_code ret;
 137
 138     ret = krb5_init_context(&context);
 139     if (ret)
 140         return 0;
 141     if (server) {
 142         krb5_keytab kt;
 143         krb5_kt_cursor cursor;
 144
 145         ret = krb5_kt_default(context, &kt);
 146         if (ret)
 147             return 0;
 148
 149         ret = krb5_kt_start_seq_get (context, kt, &cursor);
 150         if (ret) {
 151             krb5_kt_close (context, kt);
 152             return 0;
 153         }
 154         krb5_kt_end_seq_get (context, kt, &cursor);
 155         krb5_kt_close (context, kt);
 156
 157         str_data[3] = TELQUAL_REPLY;
 158     } else
 159         str_data[3] = TELQUAL_IS;
 160     return(1);
 161 }
 162
 163 extern int net;
 164
 165 static int
 166 kerberos5_send(const char *name, Authenticator *ap)
 167 {
 168     krb5_error_code ret;
 169     krb5_ccache ccache;
 170     int ap_opts;
 171     krb5_data cksum_data;
 172     char foo[2];
 173
 174     if (!UserNameRequested) {
 175         if (auth_debug_mode) {
 176             printf("Kerberos V5: no user name supplied\r\n");
 177         }
 178         return(0);
 179     }
 180
 181     ret = krb5_cc_default(context, &ccache);
 182     if (ret) {
 183         if (auth_debug_mode) {
 184             printf("Kerberos V5: could not get default ccache: %s\r\n",
 185                    krb5_get_err_text (context, ret));
 186         }
 187         return 0;
 188     }
 189
 190     if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL)
 191         ap_opts = AP_OPTS_MUTUAL_REQUIRED;
 192     else
 193         ap_opts = 0;
 194     ap_opts |= AP_OPTS_USE_SUBKEY;
 195
 196     ret = krb5_auth_con_init (context, &auth_context);
 197     if (ret) {
 198         if (auth_debug_mode) {
 199             printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
 200                    krb5_get_err_text(context, ret));
 201         }
 202         return(0);
 203     }
 204
 205     ret = krb5_auth_con_setaddrs_from_fd (context,
 206                                           auth_context,
 207                                           &net);
 208     if (ret) {
 209         if (auth_debug_mode) {
 210             printf ("Kerberos V5:"
 211                     " krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
 212                     krb5_get_err_text(context, ret));
 213         }
 214         return(0);
 215     }
 216
 217     krb5_auth_con_setkeytype (context, auth_context, KEYTYPE_DES);
 218
 219     foo[0] = ap->type;
 220     foo[1] = ap->way;
 221
 222     cksum_data.length = sizeof(foo);
 223     cksum_data.data   = foo;
 224
 225
 226     {
 227         krb5_principal service;
 228         char sname[128];
 229
 230
 231         ret = krb5_sname_to_principal (context,
 232                                        RemoteHostName,
 233                                        NULL,
 234                                        KRB5_NT_SRV_HST,
 235                                        &service);
 236         if(ret) {
 237             if (auth_debug_mode) {
 238                 printf ("Kerberos V5:"
 239                         " krb5_sname_to_principal(%s) failed (%s)\r\n",
 240                         RemoteHostName, krb5_get_err_text(context, ret));
 241             }
 242             return 0;
 243         }
 244         ret = krb5_unparse_name_fixed(context, service, sname, sizeof(sname));
 245         if(ret) {
 246             if (auth_debug_mode) {
 247                 printf ("Kerberos V5:"
 248                         " krb5_unparse_name_fixed failed (%s)\r\n",
 249                         krb5_get_err_text(context, ret));
 250             }
 251             return 0;
 252         }
 253         printf("[ Trying %s (%s)... ]\r\n", name, sname);
 254         ret = krb5_mk_req_exact(context, &auth_context, ap_opts,
 255                                 service,
 256                                 &cksum_data, ccache, &auth);
 257         krb5_free_principal (context, service);
 258
 259     }
 260     if (ret) {
 261         if (1 || auth_debug_mode) {
 262             printf("Kerberos V5: mk_req failed (%s)\r\n",
 263                    krb5_get_err_text(context, ret));
 264         }
 265         return(0);
 266     }
 267
 268     if (!auth_sendname((unsigned char *)UserNameRequested,
 269                        strlen(UserNameRequested))) {
 270         if (auth_debug_mode)
 271             printf("Not enough room for user name\r\n");
 272         return(0);
 273     }
 274     if (!Data(ap, KRB_AUTH, auth.data, auth.length)) {
 275         if (auth_debug_mode)
 276             printf("Not enough room for authentication data\r\n");
 277         return(0);
 278     }
 279     if (auth_debug_mode) {
 280         printf("Sent Kerberos V5 credentials to server\r\n");
 281     }
 282     return(1);
 283 }
 284
 285 int
 286 kerberos5_send_mutual(Authenticator *ap)
 287 {
 288     return kerberos5_send("mutual KERBEROS5", ap);
 289 }
 290
 291 int
 292 kerberos5_send_oneway(Authenticator *ap)
 293 {
 294     return kerberos5_send("KERBEROS5", ap);
 295 }
 296
 297 void
 298 kerberos5_is(Authenticator *ap, unsigned char *data, int cnt)
 299 {
 300     krb5_error_code ret;
 301     krb5_data outbuf;
 302     krb5_keyblock *key_block;
 303     char *name;
 304     krb5_principal server;
 305     int zero = 0;
 306
 307     if (cnt-- < 1)
 308         return;
 309     switch (*data++) {
 310     case KRB_AUTH:
 311         auth.data = (char *)data;
 312         auth.length = cnt;
 313
 314         auth_context = NULL;
 315
 316         ret = krb5_auth_con_init (context, &auth_context);
 317         if (ret) {
 318             Data(ap, KRB_REJECT, "krb5_auth_con_init failed", -1);
 319             auth_finished(ap, AUTH_REJECT);
 320             if (auth_debug_mode)
 321                 printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
 322                        krb5_get_err_text(context, ret));
 323             return;
 324         }
 325
 326         ret = krb5_auth_con_setaddrs_from_fd (context,
 327                                               auth_context,
 328                                               &zero);
 329         if (ret) {
 330             Data(ap, KRB_REJECT, "krb5_auth_con_setaddrs_from_fd failed", -1);
 331             auth_finished(ap, AUTH_REJECT);
 332             if (auth_debug_mode)
 333                 printf("Kerberos V5: "
 334                        "krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
 335                        krb5_get_err_text(context, ret));
 336             return;
 337         }
 338
 339         ret = krb5_sock_to_principal (context,
 340                                       0,
 341                                       "host",
 342                                       KRB5_NT_SRV_HST,
 343                                       &server);
 344         if (ret) {
 345             Data(ap, KRB_REJECT, "krb5_sock_to_principal failed", -1);
 346             auth_finished(ap, AUTH_REJECT);
 347             if (auth_debug_mode)
 348                 printf("Kerberos V5: "
 349                        "krb5_sock_to_principal failed (%s)\r\n",
 350                        krb5_get_err_text(context, ret));
 351             return;
 352         }
 353
 354         ret = krb5_rd_req(context,
 355                           &auth_context,
 356                           &auth,
 357                           server,
 358                           NULL,
 359                           NULL,
 360                           &ticket);
 361
 362         krb5_free_principal (context, server);
 363         if (ret) {
 364             char *errbuf;
 365
 366             asprintf(&errbuf,
 367                      "Read req failed: %s",
 368                      krb5_get_err_text(context, ret));
 369             Data(ap, KRB_REJECT, errbuf, -1);
 370             if (auth_debug_mode)
 371                 printf("%s\r\n", errbuf);
 372             free (errbuf);
 373             return;
 374         }
 375
 376         {
 377             char foo[2];
 378
 379             foo[0] = ap->type;
 380             foo[1] = ap->way;
 381
 382             ret = krb5_verify_authenticator_checksum(context,
 383                                                      auth_context,
 384                                                      foo,
 385                                                      sizeof(foo));
 386
 387             if (ret) {
 388                 char *errbuf;
 389                 asprintf(&errbuf, "Bad checksum: %s",
 390                          krb5_get_err_text(context, ret));
 391                 Data(ap, KRB_REJECT, errbuf, -1);
 392                 if (auth_debug_mode)
 393                     printf ("%s\r\n", errbuf);
 394                 free(errbuf);
 395                 return;
 396             }
 397         }
 398         ret = krb5_auth_con_getremotesubkey (context,
 399                                              auth_context,
 400                                              &key_block);
 401
 402         if (ret) {
 403             Data(ap, KRB_REJECT, "krb5_auth_con_getremotesubkey failed", -1);
 404             auth_finished(ap, AUTH_REJECT);
 405             if (auth_debug_mode)
 406                 printf("Kerberos V5: "
 407                        "krb5_auth_con_getremotesubkey failed (%s)\r\n",
 408                        krb5_get_err_text(context, ret));
 409             return;
 410         }
 411
 412         if (key_block == NULL) {
 413             ret = krb5_auth_con_getkey(context,
 414                                        auth_context,
 415                                        &key_block);
 416         }
 417         if (ret) {
 418             Data(ap, KRB_REJECT, "krb5_auth_con_getkey failed", -1);
 419             auth_finished(ap, AUTH_REJECT);
 420             if (auth_debug_mode)
 421                 printf("Kerberos V5: "
 422                        "krb5_auth_con_getkey failed (%s)\r\n",
 423                        krb5_get_err_text(context, ret));
 424             return;
 425         }
 426         if (key_block == NULL) {
 427             Data(ap, KRB_REJECT, "no subkey received", -1);
 428             auth_finished(ap, AUTH_REJECT);
 429             if (auth_debug_mode)
 430                 printf("Kerberos V5: "
 431                        "krb5_auth_con_getremotesubkey returned NULL key\r\n");
 432             return;
 433         }
 434
 435         if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
 436             ret = krb5_mk_rep(context, auth_context, &outbuf);
 437             if (ret) {
 438                 Data(ap, KRB_REJECT,
 439                      "krb5_mk_rep failed", -1);
 440                 auth_finished(ap, AUTH_REJECT);
 441                 if (auth_debug_mode)
 442                     printf("Kerberos V5: "
 443                            "krb5_mk_rep failed (%s)\r\n",
 444                            krb5_get_err_text(context, ret));
 445                 return;
 446             }
 447             Data(ap, KRB_RESPONSE, outbuf.data, outbuf.length);
 448         }
 449         if (krb5_unparse_name(context, ticket->client, &name))
 450             name = 0;
 451
 452         if(UserNameRequested && krb5_kuserok(context,
 453                                              ticket->client,
 454                                              UserNameRequested)) {
 455             Data(ap, KRB_ACCEPT, name, name ? -1 : 0);
 456             if (auth_debug_mode) {
 457                 printf("Kerberos5 identifies him as ``%s''\r\n",
 458                        name ? name : "");
 459             }
 460
 461             if(key_block->keytype == ETYPE_DES_CBC_MD5 ||
 462                key_block->keytype == ETYPE_DES_CBC_MD4 ||
 463                key_block->keytype == ETYPE_DES_CBC_CRC) {
 464                 Session_Key skey;
 465
 466                 skey.type = SK_DES;
 467                 skey.length = 8;
 468                 skey.data = key_block->keyvalue.data;
 469                 encrypt_session_key(&skey, 0);
 470             }
 471
 472         } else {
 473             char *msg;
 474
 475             asprintf (&msg, "user `%s' is not authorized to "
 476                       "login as `%s'",
 477                       name ? name : "<unknown>",
 478                       UserNameRequested ? UserNameRequested : "<nobody>");
 479             if (msg == NULL)
 480                 Data(ap, KRB_REJECT, NULL, 0);
 481             else {
 482                 Data(ap, KRB_REJECT, (void *)msg, -1);
 483                 free(msg);
 484             }
 485             auth_finished (ap, AUTH_REJECT);
 486             krb5_free_keyblock_contents(context, key_block);
 487             break;
 488         }
 489         auth_finished(ap, AUTH_USER);
 490         krb5_free_keyblock_contents(context, key_block);
 491
 492         break;
 493     case KRB_FORWARD: {
 494         struct passwd *pwd;
 495         char ccname[1024];      /* XXX */
 496         krb5_data inbuf;
 497         krb5_ccache ccache;
 498         inbuf.data = (char *)data;
 499         inbuf.length = cnt;
 500
 501         pwd = getpwnam (UserNameRequested);
 502         if (pwd == NULL)
 503             break;
 504
 505         snprintf (ccname, sizeof(ccname),
 506                   "FILE:/tmp/krb5cc_%u", pwd->pw_uid);
 507
 508         ret = krb5_cc_resolve (context, ccname, &ccache);
 509         if (ret) {
 510             if (auth_debug_mode)
 511                 printf ("Kerberos V5: could not get ccache: %s\r\n",
 512                         krb5_get_err_text(context, ret));
 513             break;
 514         }
 515
 516         ret = krb5_cc_initialize (context,
 517                                   ccache,
 518                                   ticket->client);
 519         if (ret) {
 520             if (auth_debug_mode)
 521                 printf ("Kerberos V5: could not init ccache: %s\r\n",
 522                         krb5_get_err_text(context, ret));
 523             break;
 524         }
 525
 526 #if defined(DCE)
 527         esetenv("KRB5CCNAME", ccname, 1);
 528 #endif
 529         ret = krb5_rd_cred2 (context,
 530                              auth_context,
 531                              ccache,
 532                              &inbuf);
 533         if(ret) {
 534             char *errbuf;
 535
 536             asprintf (&errbuf,
 537                       "Read forwarded creds failed: %s",
 538                       krb5_get_err_text (context, ret));
 539             if(errbuf == NULL)
 540                 Data(ap, KRB_FORWARD_REJECT, NULL, 0);
 541             else
 542                 Data(ap, KRB_FORWARD_REJECT, errbuf, -1);
 543             if (auth_debug_mode)
 544                 printf("Could not read forwarded credentials: %s\r\n",
 545                        errbuf);
 546             free (errbuf);
 547         } else {
 548             Data(ap, KRB_FORWARD_ACCEPT, 0, 0);
 549 #if defined(DCE)
 550             dfsfwd = 1;
 551 #endif
 552         }
 553         chown (ccname + 5, pwd->pw_uid, -1);
 554         if (auth_debug_mode)
 555             printf("Forwarded credentials obtained\r\n");
 556         break;
 557     }
 558     default:
 559         if (auth_debug_mode)
 560             printf("Unknown Kerberos option %d\r\n", data[-1]);
 561         Data(ap, KRB_REJECT, 0, 0);
 562         break;
 563     }
 564 }
 565
 566 void
 567 kerberos5_reply(Authenticator *ap, unsigned char *data, int cnt)
 568 {
 569     static int mutual_complete = 0;
 570
 571     if (cnt-- < 1)
 572         return;
 573     switch (*data++) {
 574     case KRB_REJECT:
 575         if (cnt > 0) {
 576             printf("[ Kerberos V5 refuses authentication because %.*s ]\r\n",
 577                    cnt, data);
 578         } else
 579             printf("[ Kerberos V5 refuses authentication ]\r\n");
 580         auth_send_retry();
 581         return;
 582     case KRB_ACCEPT: {
 583         krb5_error_code ret;
 584         Session_Key skey;
 585         krb5_keyblock *keyblock;
 586
 587         if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL &&
 588             !mutual_complete) {
 589             printf("[ Kerberos V5 accepted you, but didn't provide mutual authentication! ]\r\n");
 590             auth_send_retry();
 591             return;
 592         }
 593         if (cnt)
 594             printf("[ Kerberos V5 accepts you as ``%.*s'' ]\r\n", cnt, data);
 595         else
 596             printf("[ Kerberos V5 accepts you ]\r\n");
 597
 598         ret = krb5_auth_con_getlocalsubkey (context,
 599                                             auth_context,
 600                                             &keyblock);
 601         if (ret)
 602             ret = krb5_auth_con_getkey (context,
 603                                         auth_context,
 604                                         &keyblock);
 605         if(ret) {
 606             printf("[ krb5_auth_con_getkey: %s ]\r\n",
 607                    krb5_get_err_text(context, ret));
 608             auth_send_retry();
 609             return;
 610         }
 611
 612         skey.type = SK_DES;
 613         skey.length = 8;
 614         skey.data = keyblock->keyvalue.data;
 615         encrypt_session_key(&skey, 0);
 616         krb5_free_keyblock_contents (context, keyblock);
 617         auth_finished(ap, AUTH_USER);
 618         if (forward_flags & OPTS_FORWARD_CREDS)
 619             kerberos5_forward(ap);
 620         break;
 621     }
 622     case KRB_RESPONSE:
 623         if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
 624             /* the rest of the reply should contain a krb_ap_rep */
 625           krb5_ap_rep_enc_part *reply;
 626           krb5_data inbuf;
 627           krb5_error_code ret;
 628
 629           inbuf.length = cnt;
 630           inbuf.data = (char *)data;
 631
 632           ret = krb5_rd_rep(context, auth_context, &inbuf, &reply);
 633           if (ret) {
 634               printf("[ Mutual authentication failed: %s ]\r\n",
 635                      krb5_get_err_text (context, ret));
 636               auth_send_retry();
 637               return;
 638           }
 639           krb5_free_ap_rep_enc_part(context, reply);
 640           mutual_complete = 1;
 641         }
 642         return;
 643     case KRB_FORWARD_ACCEPT:
 644         printf("[ Kerberos V5 accepted forwarded credentials ]\r\n");
 645         return;
 646     case KRB_FORWARD_REJECT:
 647         printf("[ Kerberos V5 refuses forwarded credentials because %.*s ]\r\n",
 648                cnt, data);
 649         return;
 650     default:
 651         if (auth_debug_mode)
 652             printf("Unknown Kerberos option %d\r\n", data[-1]);
 653         return;
 654     }
 655 }
 656
 657 int
 658 kerberos5_status(Authenticator *ap __unused, char *name, int level)
 659 {
 660     if (level < AUTH_USER)
 661         return(level);
 662
 663     if (UserNameRequested &&
 664         krb5_kuserok(context,
 665                      ticket->client,
 666                      UserNameRequested))
 667         {
 668             strcpy(name, UserNameRequested);
 669             return(AUTH_VALID);
 670         } else
 671             return(AUTH_USER);
 672 }
 673
 674 #define BUMP(buf, len)          while (*(buf)) {++(buf), --(len);}
 675 #define ADDC(buf, len, c)       if ((len) > 0) {*(buf)++ = (c); --(len);}
 676
 677 void
 678 kerberos5_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
 679 {
 680     int i;
 681
 682     buf[buflen-1] = '\0';               /* make sure its NULL terminated */
 683     buflen -= 1;
 684
 685     switch(data[3]) {
 686     case KRB_REJECT:            /* Rejected (reason might follow) */
 687         strlcpy((char *)buf, " REJECT ", buflen);
 688         goto common;
 689
 690     case KRB_ACCEPT:            /* Accepted (name might follow) */
 691         strlcpy((char *)buf, " ACCEPT ", buflen);
 692     common:
 693         BUMP(buf, buflen);
 694         if (cnt <= 4)
 695             break;
 696         ADDC(buf, buflen, '"');
 697         for (i = 4; i < cnt; i++)
 698             ADDC(buf, buflen, data[i]);
 699         ADDC(buf, buflen, '"');
 700         ADDC(buf, buflen, '\0');
 701         break;
 702
 703
 704     case KRB_AUTH:                      /* Authentication data follows */
 705         strlcpy((char *)buf, " AUTH", buflen);
 706         goto common2;
 707
 708     case KRB_RESPONSE:
 709         strlcpy((char *)buf, " RESPONSE", buflen);
 710         goto common2;
 711
 712     case KRB_FORWARD:           /* Forwarded credentials follow */
 713         strlcpy((char *)buf, " FORWARD", buflen);
 714         goto common2;
 715
 716     case KRB_FORWARD_ACCEPT:    /* Forwarded credentials accepted */
 717         strlcpy((char *)buf, " FORWARD_ACCEPT", buflen);
 718         goto common2;
 719
 720     case KRB_FORWARD_REJECT:    /* Forwarded credentials rejected */
 721         /* (reason might follow) */
 722         strlcpy((char *)buf, " FORWARD_REJECT", buflen);
 723         goto common2;
 724
 725     default:
 726         snprintf(buf, buflen, " %d (unknown)", data[3]);
 727     common2:
 728         BUMP(buf, buflen);
 729         for (i = 4; i < cnt; i++) {
 730             snprintf(buf, buflen, " %d", data[i]);
 731             BUMP(buf, buflen);
 732         }
 733         break;
 734     }
 735 }
 736
 737 void
 738 kerberos5_forward(Authenticator *ap)
 739 {
 740     krb5_error_code ret;
 741     krb5_ccache     ccache;
 742     krb5_creds      creds;
 743     krb5_kdc_flags  flags;
 744     krb5_data       out_data;
 745     krb5_principal  principal;
 746
 747     ret = krb5_cc_default (context, &ccache);
 748     if (ret) {
 749         if (auth_debug_mode)
 750             printf ("KerberosV5: could not get default ccache: %s\r\n",
 751                     krb5_get_err_text (context, ret));
 752         return;
 753     }
 754
 755     ret = krb5_cc_get_principal (context, ccache, &principal);
 756     if (ret) {
 757         if (auth_debug_mode)
 758             printf ("KerberosV5: could not get principal: %s\r\n",
 759                     krb5_get_err_text (context, ret));
 760         return;
 761     }
 762
 763     memset (&creds, 0, sizeof(creds));
 764
 765     creds.client = principal;
 766
 767     ret = krb5_build_principal (context,
 768                                 &creds.server,
 769                                 strlen(principal->realm),
 770                                 principal->realm,
 771                                 "krbtgt",
 772                                 principal->realm,
 773                                 NULL);
 774
 775     if (ret) {
 776         if (auth_debug_mode)
 777             printf ("KerberosV5: could not get principal: %s\r\n",
 778                     krb5_get_err_text (context, ret));
 779         return;
 780     }
 781
 782     creds.times.endtime = 0;
 783
 784     flags.i = 0;
 785     flags.b.forwarded = 1;
 786     if (forward_flags & OPTS_FORWARDABLE_CREDS)
 787         flags.b.forwardable = 1;
 788
 789     ret = krb5_get_forwarded_creds (context,
 790                                     auth_context,
 791                                     ccache,
 792                                     flags.i,
 793                                     RemoteHostName,
 794                                     &creds,
 795                                     &out_data);
 796     if (ret) {
 797         if (auth_debug_mode)
 798             printf ("Kerberos V5: error getting forwarded creds: %s\r\n",
 799                     krb5_get_err_text (context, ret));
 800         return;
 801     }
 802
 803     if(!Data(ap, KRB_FORWARD, out_data.data, out_data.length)) {
 804         if (auth_debug_mode)
 805             printf("Not enough room for authentication data\r\n");
 806     } else {
 807         if (auth_debug_mode)
 808             printf("Forwarded local Kerberos V5 credentials to server\r\n");
 809     }
 810 }
 811
 812 #if defined(DCE)
 813 /* if this was a K5 authentication try and join a PAG for the user. */
 814 void
 815 kerberos5_dfspag(void)
 816 {
 817     if (dfsk5ok) {
 818         dfspag = krb5_dfs_pag(context, dfsfwd, ticket->client,
 819                               UserNameRequested);
 820     }
 821 }
 822 #endif
 823
 824 #endif /* KRB5 */