appl/telnet/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
  34 /*
  35  * Copyright (C) 1990 by the Massachusetts Institute of Technology
  36  *
  37  * Export of this software from the United States of America may
  38  * require a specific license from the United States Government.
  39  * It is the responsibility of any person or organization contemplating
  40  * export to obtain such a license before exporting.
  41  *
  42  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
  43  * distribute this software and its documentation for any purpose and
  44  * without fee is hereby granted, provided that the above copyright
  45  * notice appear in all copies and that both that copyright notice and
  46  * this permission notice appear in supporting documentation, and that
  47  * the name of M.I.T. not be used in advertising or publicity pertaining
  48  * to distribution of the software without specific, written prior
  49  * permission.  M.I.T. makes no representations about the suitability of
  50  * this software for any purpose.  It is provided "as is" without express
  51  * or implied warranty.
  52  */
  53
  54 #include <config.h>
  55
  56 RCSID("$Id$");
  57
  58 #ifdef  KRB5
  59
  60 #include <arpa/telnet.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65 #include <netdb.h>
  66 #include <ctype.h>
  67 #include <pwd.h>
  68 #define Authenticator k5_Authenticator
  69 #include <krb5.h>
  70 #undef Authenticator
  71 #include <roken.h>
  72 #ifdef SOCKS
  73 #include <socks.h>
  74 #endif
  75
  76
  77 #include "encrypt.h"
  78 #include "auth.h"
  79 #include "misc.h"
  80
  81 #if defined(DCE)
  82 int dfsk5ok = 0;
  83 int dfspag = 0;
  84 int dfsfwd = 0;
  85 #endif
  86
  87 int forward_flags = 0;  /* Flags get set in telnet/main.c on -f and -F */
  88
  89 int forward(int);
  90 int forwardable(int);
  91
  92 /* These values need to be the same as those defined in telnet/main.c. */
  93 /* Either define them in both places, or put in some common header file. */
  94 #define OPTS_FORWARD_CREDS      0x00000002
  95 #define OPTS_FORWARDABLE_CREDS  0x00000001
  96
  97
  98 void kerberos5_forward (Authenticator *);
  99
 100 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
 101                                         AUTHTYPE_KERBEROS_V5, };
 102
 103 #define KRB_AUTH                0       /* Authentication data follows */
 104 #define KRB_REJECT              1       /* Rejected (reason might follow) */
 105 #define KRB_ACCEPT              2       /* Accepted */
 106 #define KRB_RESPONSE            3       /* Response for mutual auth. */
 107
 108 #define KRB_FORWARD             4       /* Forwarded credentials follow */
 109 #define KRB_FORWARD_ACCEPT      5       /* Forwarded credentials accepted */
 110 #define KRB_FORWARD_REJECT      6       /* Forwarded credentials rejected */
 111
 112 static  krb5_data auth;
 113 static  krb5_ticket *ticket;
 114
 115 static krb5_context context;
 116 static krb5_auth_context auth_context;
 117
 118 static int
 119 Data(Authenticator *ap, int type, void *d, int c)
 120 {
 121     unsigned char *p = str_data + 4;
 122     unsigned char *cd = (unsigned char *)d;
 123
 124     if (c == -1)
 125         c = strlen((char*)cd);
 126
 127     if (auth_debug_mode) {
 128         printf("%s:%d: [%d] (%d)",
 129                str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
 130                str_data[3],
 131                type, c);
 132         printd(d, c);
 133         printf("\r\n");
 134     }
 135     *p++ = ap->type;
 136     *p++ = ap->way;
 137     *p++ = type;
 138     while (c-- > 0) {
 139         if ((*p++ = *cd++) == IAC)
 140             *p++ = IAC;
 141     }
 142     *p++ = IAC;
 143     *p++ = SE;
 144     if (str_data[3] == TELQUAL_IS)
 145         printsub('>', &str_data[2], p - &str_data[2]);
 146     return(telnet_net_write(str_data, p - str_data));
 147 }
 148
 149 int
 150 kerberos5_init(Authenticator *ap, int server)
 151 {
 152     krb5_error_code ret;
 153
 154     ret = krb5_init_context(&context);
 155     if (ret)
 156         return 0;
 157     if (server) {
 158         krb5_keytab kt;
 159         krb5_kt_cursor cursor;
 160
 161         ret = krb5_kt_default(context, &kt);
 162         if (ret)
 163             return 0;
 164
 165         ret = krb5_kt_start_seq_get (context, kt, &cursor);
 166         if (ret) {
 167             krb5_kt_close (context, kt);
 168             return 0;
 169         }
 170         krb5_kt_end_seq_get (context, kt, &cursor);
 171         krb5_kt_close (context, kt);
 172
 173         str_data[3] = TELQUAL_REPLY;
 174     } else
 175         str_data[3] = TELQUAL_IS;
 176     return(1);
 177 }
 178
 179 extern int net;
 180 static int
 181 kerberos5_send(char *name, Authenticator *ap)
 182 {
 183     krb5_error_code ret;
 184     krb5_ccache ccache;
 185     int ap_opts;
 186     krb5_data cksum_data;
 187     char foo[2];
 188
 189     if (!UserNameRequested) {
 190         if (auth_debug_mode) {
 191             printf("Kerberos V5: no user name supplied\r\n");
 192         }
 193         return(0);
 194     }
 195
 196     ret = krb5_cc_default(context, &ccache);
 197     if (ret) {
 198         if (auth_debug_mode) {
 199             printf("Kerberos V5: could not get default ccache: %s\r\n",
 200                    krb5_get_err_text (context, ret));
 201         }
 202         return 0;
 203     }
 204
 205     if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL)
 206         ap_opts = AP_OPTS_MUTUAL_REQUIRED;
 207     else
 208         ap_opts = 0;
 209
 210     ap_opts |= AP_OPTS_USE_SUBKEY;
 211
 212     ret = krb5_auth_con_init (context, &auth_context);
 213     if (ret) {
 214         if (auth_debug_mode) {
 215             printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
 216                    krb5_get_err_text(context, ret));
 217         }
 218         return(0);
 219     }
 220
 221     ret = krb5_auth_con_setaddrs_from_fd (context,
 222                                           auth_context,
 223                                           &net);
 224     if (ret) {
 225         if (auth_debug_mode) {
 226             printf ("Kerberos V5:"
 227                     " krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
 228                     krb5_get_err_text(context, ret));
 229         }
 230         return(0);
 231     }
 232
 233     krb5_auth_con_setkeytype (context, auth_context, KEYTYPE_DES);
 234
 235     foo[0] = ap->type;
 236     foo[1] = ap->way;
 237
 238     cksum_data.length = sizeof(foo);
 239     cksum_data.data   = foo;
 240
 241
 242     {
 243         krb5_principal service;
 244         char sname[128];
 245
 246
 247         ret = krb5_sname_to_principal (context,
 248                                        RemoteHostName,
 249                                        NULL,
 250                                        KRB5_NT_SRV_HST,
 251                                        &service);
 252         if(ret) {
 253             if (auth_debug_mode) {
 254                 printf ("Kerberos V5:"
 255                         " krb5_sname_to_principal(%s) failed (%s)\r\n",
 256                         RemoteHostName, krb5_get_err_text(context, ret));
 257             }
 258             return 0;
 259         }
 260         ret = krb5_unparse_name_fixed(context, service, sname, sizeof(sname));
 261         if(ret) {
 262             if (auth_debug_mode) {
 263                 printf ("Kerberos V5:"
 264                         " krb5_unparse_name_fixed failed (%s)\r\n",
 265                         krb5_get_err_text(context, ret));
 266             }
 267             return 0;
 268         }
 269         printf("[ Trying %s (%s)... ]\r\n", name, sname);
 270         ret = krb5_mk_req_exact(context, &auth_context, ap_opts,
 271                                 service,
 272                                 &cksum_data, ccache, &auth);
 273         krb5_free_principal (context, service);
 274
 275     }
 276     if (ret) {
 277         if (1 || auth_debug_mode) {
 278             printf("Kerberos V5: mk_req failed (%s)\r\n",
 279                    krb5_get_err_text(context, ret));
 280         }
 281         return(0);
 282     }
 283
 284     if (!auth_sendname((unsigned char *)UserNameRequested,
 285                        strlen(UserNameRequested))) {
 286         if (auth_debug_mode)
 287             printf("Not enough room for user name\r\n");
 288         return(0);
 289     }
 290     if (!Data(ap, KRB_AUTH, auth.data, auth.length)) {
 291         if (auth_debug_mode)
 292             printf("Not enough room for authentication data\r\n");
 293         return(0);
 294     }
 295     if (auth_debug_mode) {
 296         printf("Sent Kerberos V5 credentials to server\r\n");
 297     }
 298     return(1);
 299 }
 300
 301 int
 302 kerberos5_send_mutual(Authenticator *ap)
 303 {
 304     return kerberos5_send("mutual KERBEROS5", ap);
 305 }
 306
 307 int
 308 kerberos5_send_oneway(Authenticator *ap)
 309 {
 310     return kerberos5_send("KERBEROS5", ap);
 311 }
 312
 313 void
 314 kerberos5_is(Authenticator *ap, unsigned char *data, int cnt)
 315 {
 316     krb5_error_code ret;
 317     krb5_data outbuf;
 318     krb5_keyblock *key_block;
 319     char *name;
 320     krb5_principal server;
 321     int zero = 0;
 322
 323     if (cnt-- < 1)
 324         return;
 325     switch (*data++) {
 326     case KRB_AUTH:
 327         auth.data = (char *)data;
 328         auth.length = cnt;
 329
 330         auth_context = NULL;
 331
 332         ret = krb5_auth_con_init (context, &auth_context);
 333         if (ret) {
 334             Data(ap, KRB_REJECT, "krb5_auth_con_init failed", -1);
 335             auth_finished(ap, AUTH_REJECT);
 336             if (auth_debug_mode)
 337                 printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
 338                        krb5_get_err_text(context, ret));
 339             return;
 340         }
 341
 342         ret = krb5_auth_con_setaddrs_from_fd (context,
 343                                               auth_context,
 344                                               &zero);
 345         if (ret) {
 346             Data(ap, KRB_REJECT, "krb5_auth_con_setaddrs_from_fd failed", -1);
 347             auth_finished(ap, AUTH_REJECT);
 348             if (auth_debug_mode)
 349                 printf("Kerberos V5: "
 350                        "krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
 351                        krb5_get_err_text(context, ret));
 352             return;
 353         }
 354
 355         ret = krb5_sock_to_principal (context,
 356                                       0,
 357                                       "host",
 358                                       KRB5_NT_SRV_HST,
 359                                       &server);
 360         if (ret) {
 361             Data(ap, KRB_REJECT, "krb5_sock_to_principal failed", -1);
 362             auth_finished(ap, AUTH_REJECT);
 363             if (auth_debug_mode)
 364                 printf("Kerberos V5: "
 365                        "krb5_sock_to_principal failed (%s)\r\n",
 366                        krb5_get_err_text(context, ret));
 367             return;
 368         }
 369
 370         ret = krb5_rd_req(context,
 371                           &auth_context,
 372                           &auth,
 373                           server,
 374                           NULL,
 375                           NULL,
 376                           &ticket);
 377
 378         krb5_free_principal (context, server);
 379         if (ret) {
 380             char *errbuf;
 381
 382             asprintf(&errbuf,
 383                      "Read req failed: %s",
 384                      krb5_get_err_text(context, ret));
 385             Data(ap, KRB_REJECT, errbuf, -1);
 386             if (auth_debug_mode)
 387                 printf("%s\r\n", errbuf);
 388             free (errbuf);
 389             return;
 390         }
 391
 392         {
 393             char foo[2];
 394
 395             foo[0] = ap->type;
 396             foo[1] = ap->way;
 397
 398             ret = krb5_verify_authenticator_checksum(context,
 399                                                      auth_context,
 400                                                      foo,
 401                                                      sizeof(foo));
 402
 403             if (ret) {
 404                 char *errbuf;
 405                 asprintf(&errbuf, "Bad checksum: %s",
 406                          krb5_get_err_text(context, ret));
 407                 Data(ap, KRB_REJECT, errbuf, -1);
 408                 if (auth_debug_mode)
 409                     printf ("%s\r\n", errbuf);
 410                 free(errbuf);
 411                 return;
 412             }
 413         }
 414         ret = krb5_auth_con_getremotesubkey (context,
 415                                              auth_context,
 416                                              &key_block);
 417
 418         if (ret) {
 419             Data(ap, KRB_REJECT, "krb5_auth_con_getremotesubkey failed", -1);
 420             auth_finished(ap, AUTH_REJECT);
 421             if (auth_debug_mode)
 422                 printf("Kerberos V5: "
 423                        "krb5_auth_con_getremotesubkey failed (%s)\r\n",
 424                        krb5_get_err_text(context, ret));
 425             return;
 426         }
 427
 428         if (key_block == NULL) {
 429             ret = krb5_auth_con_getkey(context,
 430                                        auth_context,
 431                                        &key_block);
 432         }
 433         if (ret) {
 434             Data(ap, KRB_REJECT, "krb5_auth_con_getkey failed", -1);
 435             auth_finished(ap, AUTH_REJECT);
 436             if (auth_debug_mode)
 437                 printf("Kerberos V5: "
 438                        "krb5_auth_con_getkey failed (%s)\r\n",
 439                        krb5_get_err_text(context, ret));
 440             return;
 441         }
 442         if (key_block == NULL) {
 443             Data(ap, KRB_REJECT, "no subkey received", -1);
 444             auth_finished(ap, AUTH_REJECT);
 445             if (auth_debug_mode)
 446                 printf("Kerberos V5: "
 447                        "krb5_auth_con_getremotesubkey returned NULL key\r\n");
 448             return;
 449         }
 450
 451         if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
 452             ret = krb5_mk_rep(context, auth_context, &outbuf);
 453             if (ret) {
 454                 Data(ap, KRB_REJECT,
 455                      "krb5_mk_rep failed", -1);
 456                 auth_finished(ap, AUTH_REJECT);
 457                 if (auth_debug_mode)
 458                     printf("Kerberos V5: "
 459                            "krb5_mk_rep failed (%s)\r\n",
 460                            krb5_get_err_text(context, ret));
 461                 return;
 462             }
 463             Data(ap, KRB_RESPONSE, outbuf.data, outbuf.length);
 464         }
 465         if (krb5_unparse_name(context, ticket->client, &name))
 466             name = 0;
 467
 468         if(UserNameRequested && krb5_kuserok(context,
 469                                              ticket->client,
 470                                              UserNameRequested)) {
 471             Data(ap, KRB_ACCEPT, name, name ? -1 : 0);
 472             if (auth_debug_mode) {
 473                 printf("Kerberos5 identifies him as ``%s''\r\n",
 474                        name ? name : "");
 475             }
 476
 477             if(key_block->keytype == ETYPE_DES_CBC_MD5 ||
 478                key_block->keytype == ETYPE_DES_CBC_MD4 ||
 479                key_block->keytype == ETYPE_DES_CBC_CRC) {
 480                 Session_Key skey;
 481
 482                 skey.type = SK_DES;
 483                 skey.length = 8;
 484                 skey.data = key_block->keyvalue.data;
 485                 encrypt_session_key(&skey, 0);
 486             }
 487
 488         } else {
 489             char *msg;
 490
 491             asprintf (&msg, "user `%s' is not authorized to "
 492                       "login as `%s'",
 493                       name ? name : "<unknown>",
 494                       UserNameRequested ? UserNameRequested : "<nobody>");
 495             if (msg == NULL)
 496                 Data(ap, KRB_REJECT, NULL, 0);
 497             else {
 498                 Data(ap, KRB_REJECT, (void *)msg, -1);
 499                 free(msg);
 500             }
 501             auth_finished (ap, AUTH_REJECT);
 502             krb5_free_keyblock_contents(context, key_block);
 503             break;
 504         }
 505         auth_finished(ap, AUTH_USER);
 506         krb5_free_keyblock_contents(context, key_block);
 507
 508         break;
 509     case KRB_FORWARD: {
 510         struct passwd *pwd;
 511         char ccname[1024];      /* XXX */
 512         krb5_data inbuf;
 513         krb5_ccache ccache;
 514         inbuf.data = (char *)data;
 515         inbuf.length = cnt;
 516
 517         pwd = getpwnam (UserNameRequested);
 518         if (pwd == NULL)
 519             break;
 520
 521         snprintf (ccname, sizeof(ccname),
 522                   "FILE:/tmp/krb5cc_%u", pwd->pw_uid);
 523
 524         ret = krb5_cc_resolve (context, ccname, &ccache);
 525         if (ret) {
 526             if (auth_debug_mode)
 527                 printf ("Kerberos V5: could not get ccache: %s\r\n",
 528                         krb5_get_err_text(context, ret));
 529             break;
 530         }
 531
 532         ret = krb5_cc_initialize (context,
 533                                   ccache,
 534                                   ticket->client);
 535         if (ret) {
 536             if (auth_debug_mode)
 537                 printf ("Kerberos V5: could not init ccache: %s\r\n",
 538                         krb5_get_err_text(context, ret));
 539             break;
 540         }
 541
 542 #if defined(DCE)
 543         esetenv("KRB5CCNAME", ccname, 1);
 544 #endif
 545         ret = krb5_rd_cred2 (context,
 546                              auth_context,
 547                              ccache,
 548                              &inbuf);
 549         if(ret) {
 550             char *errbuf;
 551
 552             asprintf (&errbuf,
 553                       "Read forwarded creds failed: %s",
 554                       krb5_get_err_text (context, ret));
 555             if(errbuf == NULL)
 556                 Data(ap, KRB_FORWARD_REJECT, NULL, 0);
 557             else
 558                 Data(ap, KRB_FORWARD_REJECT, errbuf, -1);
 559             if (auth_debug_mode)
 560                 printf("Could not read forwarded credentials: %s\r\n",
 561                        errbuf);
 562             free (errbuf);
 563         } else {
 564             Data(ap, KRB_FORWARD_ACCEPT, 0, 0);
 565 #if defined(DCE)
 566             dfsfwd = 1;
 567 #endif
 568         }
 569         chown (ccname + 5, pwd->pw_uid, -1);
 570         if (auth_debug_mode)
 571             printf("Forwarded credentials obtained\r\n");
 572         break;
 573     }
 574     default:
 575         if (auth_debug_mode)
 576             printf("Unknown Kerberos option %d\r\n", data[-1]);
 577         Data(ap, KRB_REJECT, 0, 0);
 578         break;
 579     }
 580 }
 581
 582 void
 583 kerberos5_reply(Authenticator *ap, unsigned char *data, int cnt)
 584 {
 585     static int mutual_complete = 0;
 586
 587     if (cnt-- < 1)
 588         return;
 589     switch (*data++) {
 590     case KRB_REJECT:
 591         if (cnt > 0) {
 592             printf("[ Kerberos V5 refuses authentication because %.*s ]\r\n",
 593                    cnt, data);
 594         } else
 595             printf("[ Kerberos V5 refuses authentication ]\r\n");
 596         auth_send_retry();
 597         return;
 598     case KRB_ACCEPT: {
 599         krb5_error_code ret;
 600         Session_Key skey;
 601         krb5_keyblock *keyblock;
 602
 603         if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL &&
 604             !mutual_complete) {
 605             printf("[ Kerberos V5 accepted you, but didn't provide mutual authentication! ]\r\n");
 606             auth_send_retry();
 607             return;
 608         }
 609         if (cnt)
 610             printf("[ Kerberos V5 accepts you as ``%.*s'' ]\r\n", cnt, data);
 611         else
 612             printf("[ Kerberos V5 accepts you ]\r\n");
 613
 614         ret = krb5_auth_con_getlocalsubkey (context,
 615                                             auth_context,
 616                                             &keyblock);
 617         if (ret)
 618             ret = krb5_auth_con_getkey (context,
 619                                         auth_context,
 620                                         &keyblock);
 621         if(ret) {
 622             printf("[ krb5_auth_con_getkey: %s ]\r\n",
 623                    krb5_get_err_text(context, ret));
 624             auth_send_retry();
 625             return;
 626         }
 627
 628         skey.type = SK_DES;
 629         skey.length = 8;
 630         skey.data = keyblock->keyvalue.data;
 631         encrypt_session_key(&skey, 0);
 632         krb5_free_keyblock_contents (context, keyblock);
 633         auth_finished(ap, AUTH_USER);
 634         if (forward_flags & OPTS_FORWARD_CREDS)
 635             kerberos5_forward(ap);
 636         break;
 637     }
 638     case KRB_RESPONSE:
 639         if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
 640             /* the rest of the reply should contain a krb_ap_rep */
 641           krb5_ap_rep_enc_part *reply;
 642           krb5_data inbuf;
 643           krb5_error_code ret;
 644
 645           inbuf.length = cnt;
 646           inbuf.data = (char *)data;
 647
 648           ret = krb5_rd_rep(context, auth_context, &inbuf, &reply);
 649           if (ret) {
 650               printf("[ Mutual authentication failed: %s ]\r\n",
 651                      krb5_get_err_text (context, ret));
 652               auth_send_retry();
 653               return;
 654           }
 655           krb5_free_ap_rep_enc_part(context, reply);
 656           mutual_complete = 1;
 657         }
 658         return;
 659     case KRB_FORWARD_ACCEPT:
 660         printf("[ Kerberos V5 accepted forwarded credentials ]\r\n");
 661         return;
 662     case KRB_FORWARD_REJECT:
 663         printf("[ Kerberos V5 refuses forwarded credentials because %.*s ]\r\n",
 664                cnt, data);
 665         return;
 666     default:
 667         if (auth_debug_mode)
 668             printf("Unknown Kerberos option %d\r\n", data[-1]);
 669         return;
 670     }
 671 }
 672
 673 int
 674 kerberos5_status(Authenticator *ap, char *name, size_t name_sz, int level)
 675 {
 676     if (level < AUTH_USER)
 677         return(level);
 678
 679     if (UserNameRequested &&
 680         krb5_kuserok(context,
 681                      ticket->client,
 682                      UserNameRequested))
 683         {
 684             strlcpy(name, UserNameRequested, name_sz);
 685 #if defined(DCE)
 686             dfsk5ok = 1;
 687 #endif
 688             return(AUTH_VALID);
 689         } else
 690             return(AUTH_USER);
 691 }
 692
 693 #define BUMP(buf, len)          while (*(buf)) {++(buf), --(len);}
 694 #define ADDC(buf, len, c)       if ((len) > 0) {*(buf)++ = (c); --(len);}
 695
 696 void
 697 kerberos5_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
 698 {
 699     int i;
 700
 701     buf[buflen-1] = '\0';               /* make sure its NULL terminated */
 702     buflen -= 1;
 703
 704     switch(data[3]) {
 705     case KRB_REJECT:            /* Rejected (reason might follow) */
 706         strlcpy((char *)buf, " REJECT ", buflen);
 707         goto common;
 708
 709     case KRB_ACCEPT:            /* Accepted (name might follow) */
 710         strlcpy((char *)buf, " ACCEPT ", buflen);
 711     common:
 712         BUMP(buf, buflen);
 713         if (cnt <= 4)
 714             break;
 715         ADDC(buf, buflen, '"');
 716         for (i = 4; i < cnt; i++)
 717             ADDC(buf, buflen, data[i]);
 718         ADDC(buf, buflen, '"');
 719         ADDC(buf, buflen, '\0');
 720         break;
 721
 722
 723     case KRB_AUTH:                      /* Authentication data follows */
 724         strlcpy((char *)buf, " AUTH", buflen);
 725         goto common2;
 726
 727     case KRB_RESPONSE:
 728         strlcpy((char *)buf, " RESPONSE", buflen);
 729         goto common2;
 730
 731     case KRB_FORWARD:           /* Forwarded credentials follow */
 732         strlcpy((char *)buf, " FORWARD", buflen);
 733         goto common2;
 734
 735     case KRB_FORWARD_ACCEPT:    /* Forwarded credentials accepted */
 736         strlcpy((char *)buf, " FORWARD_ACCEPT", buflen);
 737         goto common2;
 738
 739     case KRB_FORWARD_REJECT:    /* Forwarded credentials rejected */
 740         /* (reason might follow) */
 741         strlcpy((char *)buf, " FORWARD_REJECT", buflen);
 742         goto common2;
 743
 744     default:
 745         snprintf((char*)buf, buflen, " %d (unknown)", data[3]);
 746     common2:
 747         BUMP(buf, buflen);
 748         for (i = 4; i < cnt; i++) {
 749             snprintf((char*)buf, buflen, " %d", data[i]);
 750             BUMP(buf, buflen);
 751         }
 752         break;
 753     }
 754 }
 755
 756 void
 757 kerberos5_forward(Authenticator *ap)
 758 {
 759     krb5_error_code ret;
 760     krb5_ccache     ccache;
 761     krb5_creds      creds;
 762     krb5_kdc_flags  flags;
 763     krb5_data       out_data;
 764     krb5_principal  principal;
 765
 766     ret = krb5_cc_default (context, &ccache);
 767     if (ret) {
 768         if (auth_debug_mode)
 769             printf ("KerberosV5: could not get default ccache: %s\r\n",
 770                     krb5_get_err_text (context, ret));
 771         return;
 772     }
 773
 774     ret = krb5_cc_get_principal (context, ccache, &principal);
 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     memset (&creds, 0, sizeof(creds));
 783
 784     creds.client = principal;
 785
 786     ret = krb5_build_principal (context,
 787                                 &creds.server,
 788                                 strlen(principal->realm),
 789                                 principal->realm,
 790                                 "krbtgt",
 791                                 principal->realm,
 792                                 NULL);
 793
 794     if (ret) {
 795         if (auth_debug_mode)
 796             printf ("KerberosV5: could not get principal: %s\r\n",
 797                     krb5_get_err_text (context, ret));
 798         return;
 799     }
 800
 801     creds.times.endtime = 0;
 802
 803     flags.i = 0;
 804     flags.b.forwarded = 1;
 805     if (forward_flags & OPTS_FORWARDABLE_CREDS)
 806         flags.b.forwardable = 1;
 807
 808     ret = krb5_get_forwarded_creds (context,
 809                                     auth_context,
 810                                     ccache,
 811                                     flags.i,
 812                                     RemoteHostName,
 813                                     &creds,
 814                                     &out_data);
 815     if (ret) {
 816         if (auth_debug_mode)
 817             printf ("Kerberos V5: error getting forwarded creds: %s\r\n",
 818                     krb5_get_err_text (context, ret));
 819         return;
 820     }
 821
 822     if(!Data(ap, KRB_FORWARD, out_data.data, out_data.length)) {
 823         if (auth_debug_mode)
 824             printf("Not enough room for authentication data\r\n");
 825     } else {
 826         if (auth_debug_mode)
 827             printf("Forwarded local Kerberos V5 credentials to server\r\n");
 828     }
 829 }
 830
 831 #if defined(DCE)
 832 /* if this was a K5 authentication try and join a PAG for the user. */
 833 void
 834 kerberos5_dfspag(void)
 835 {
 836     if (dfsk5ok) {
 837         dfspag = krb5_dfs_pag(context, dfsfwd, ticket->client,
 838                               UserNameRequested);
 839     }
 840 }
 841 #endif
 842
 843 int
 844 kerberos5_set_forward(int on)
 845 {
 846     if(on == 0)
 847         forward_flags &= ~OPTS_FORWARD_CREDS;
 848     if(on == 1)
 849         forward_flags |= OPTS_FORWARD_CREDS;
 850     if(on == -1)
 851         forward_flags ^= OPTS_FORWARD_CREDS;
 852     return 0;
 853 }
 854
 855 int
 856 kerberos5_set_forwardable(int on)
 857 {
 858     if(on == 0)
 859         forward_flags &= ~OPTS_FORWARDABLE_CREDS;
 860     if(on == 1)
 861         forward_flags |= OPTS_FORWARDABLE_CREDS;
 862     if(on == -1)
 863         forward_flags ^= OPTS_FORWARDABLE_CREDS;
 864     return 0;
 865 }
 866
 867 #endif /* KRB5 */