crypto/kerberosIV/appl/telnet/libtelnet/spx.c

   1 /*-
   2  * Copyright (c) 1992, 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 #include <config.h>
  35
  36 RCSID("$Id: spx.c,v 1.17 1999/09/16 20:41:34 assar Exp $");
  37
  38 #ifdef  SPX
  39 /*
  40  * COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
  41  * ALL RIGHTS RESERVED
  42  *
  43  * "Digital Equipment Corporation authorizes the reproduction,
  44  * distribution and modification of this software subject to the following
  45  * restrictions:
  46  *
  47  * 1.  Any partial or whole copy of this software, or any modification
  48  * thereof, must include this copyright notice in its entirety.
  49  *
  50  * 2.  This software is supplied "as is" with no warranty of any kind,
  51  * expressed or implied, for any purpose, including any warranty of fitness
  52  * or merchantibility.  DIGITAL assumes no responsibility for the use or
  53  * reliability of this software, nor promises to provide any form of
  54  * support for it on any basis.
  55  *
  56  * 3.  Distribution of this software is authorized only if no profit or
  57  * remuneration of any kind is received in exchange for such distribution.
  58  *
  59  * 4.  This software produces public key authentication certificates
  60  * bearing an expiration date established by DIGITAL and RSA Data
  61  * Security, Inc.  It may cease to generate certificates after the expiration
  62  * date.  Any modification of this software that changes or defeats
  63  * the expiration date or its effect is unauthorized.
  64  *
  65  * 5.  Software that will renew or extend the expiration date of
  66  * authentication certificates produced by this software may be obtained
  67  * from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA
  68  * 94065, (415)595-8782, or from DIGITAL"
  69  *
  70  */
  71
  72 #ifdef HAVE_SYS_TYPES_H
  73 #include <sys/types.h>
  74 #endif
  75 #ifdef HAVE_ARPA_TELNET_H
  76 #include <arpa/telnet.h>
  77 #endif
  78 #include <stdio.h>
  79 #include "gssapi_defs.h"
  80 #include <stdlib.h>
  81 #include <string.h>
  82
  83 #include <pwd.h>
  84 #ifdef SOCKS
  85 #include <socks.h>
  86 #endif
  87
  88 #include "encrypt.h"
  89 #include "auth.h"
  90 #include "misc.h"
  91
  92 extern auth_debug_mode;
  93
  94 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
  95                                         AUTHTYPE_SPX, };
  96 static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
  97                                         TELQUAL_NAME, };
  98
  99 #define SPX_AUTH        0               /* Authentication data follows */
 100 #define SPX_REJECT      1               /* Rejected (reason might follow) */
 101 #define SPX_ACCEPT      2               /* Accepted */
 102
 103 static des_key_schedule sched;
 104 static des_cblock       challenge       = { 0 };
 105
 106
 107 /*******************************************************************/
 108
 109 gss_OID_set             actual_mechs;
 110 gss_OID                 actual_mech_type, output_name_type;
 111 int                     major_status, status, msg_ctx = 0, new_status;
 112 int                     req_flags = 0, ret_flags, lifetime_rec;
 113 gss_cred_id_t           gss_cred_handle;
 114 gss_ctx_id_t            actual_ctxhandle, context_handle;
 115 gss_buffer_desc         output_token, input_token, input_name_buffer;
 116 gss_buffer_desc         status_string;
 117 gss_name_t              desired_targname, src_name;
 118 gss_channel_bindings    input_chan_bindings;
 119 char                    lhostname[GSS_C_MAX_PRINTABLE_NAME];
 120 char                    targ_printable[GSS_C_MAX_PRINTABLE_NAME];
 121 int                     to_addr=0, from_addr=0;
 122 char                    *address;
 123 gss_buffer_desc         fullname_buffer;
 124 gss_OID                 fullname_type;
 125 gss_cred_id_t           gss_delegated_cred_handle;
 126
 127 /*******************************************************************/
 128
 129
 130
 131         static int
 132 Data(ap, type, d, c)
 133         Authenticator *ap;
 134         int type;
 135         void *d;
 136         int c;
 137 {
 138         unsigned char *p = str_data + 4;
 139         unsigned char *cd = (unsigned char *)d;
 140
 141         if (c == -1)
 142                 c = strlen((char *)cd);
 143
 144         if (0) {
 145                 printf("%s:%d: [%d] (%d)",
 146                         str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
 147                         str_data[3],
 148                         type, c);
 149                 printd(d, c);
 150                 printf("\r\n");
 151         }
 152         *p++ = ap->type;
 153         *p++ = ap->way;
 154         *p++ = type;
 155         while (c-- > 0) {
 156                 if ((*p++ = *cd++) == IAC)
 157                         *p++ = IAC;
 158         }
 159         *p++ = IAC;
 160         *p++ = SE;
 161         if (str_data[3] == TELQUAL_IS)
 162                 printsub('>', &str_data[2], p - (&str_data[2]));
 163         return(telnet_net_write(str_data, p - str_data));
 164 }
 165
 166         int
 167 spx_init(ap, server)
 168         Authenticator *ap;
 169         int server;
 170 {
 171         gss_cred_id_t   tmp_cred_handle;
 172
 173         if (server) {
 174                 str_data[3] = TELQUAL_REPLY;
 175                 gethostname(lhostname, sizeof(lhostname));
 176                 snprintf (targ_printable, sizeof(targ_printable),
 177                           "SERVICE:rcmd@%s", lhostname);
 178                 input_name_buffer.length = strlen(targ_printable);
 179                 input_name_buffer.value = targ_printable;
 180                 major_status = gss_import_name(&status,
 181                                         &input_name_buffer,
 182                                         GSS_C_NULL_OID,
 183                                         &desired_targname);
 184                 major_status = gss_acquire_cred(&status,
 185                                         desired_targname,
 186                                         0,
 187                                         GSS_C_NULL_OID_SET,
 188                                         GSS_C_ACCEPT,
 189                                         &tmp_cred_handle,
 190                                         &actual_mechs,
 191                                         &lifetime_rec);
 192                 if (major_status != GSS_S_COMPLETE) return(0);
 193         } else {
 194                 str_data[3] = TELQUAL_IS;
 195         }
 196         return(1);
 197 }
 198
 199         int
 200 spx_send(ap)
 201         Authenticator *ap;
 202 {
 203         des_cblock enckey;
 204         int r;
 205
 206         gss_OID actual_mech_type, output_name_type;
 207         int     msg_ctx = 0, new_status, status;
 208         int     req_flags = 0, ret_flags, lifetime_rec, major_status;
 209         gss_buffer_desc  output_token, input_token, input_name_buffer;
 210         gss_buffer_desc  output_name_buffer, status_string;
 211         gss_name_t    desired_targname;
 212         gss_channel_bindings  input_chan_bindings;
 213         char targ_printable[GSS_C_MAX_PRINTABLE_NAME];
 214         int  from_addr=0, to_addr=0, myhostlen, j;
 215         int  deleg_flag=1, mutual_flag=0, replay_flag=0, seq_flag=0;
 216         char *address;
 217
 218         printf("[ Trying SPX ... ]\r\n");
 219         snprintf (targ_printable, sizeof(targ_printable),
 220                   "SERVICE:rcmd@%s", RemoteHostName);
 221
 222         input_name_buffer.length = strlen(targ_printable);
 223         input_name_buffer.value = targ_printable;
 224
 225         if (!UserNameRequested) {
 226                 return(0);
 227         }
 228
 229         major_status = gss_import_name(&status,
 230                                         &input_name_buffer,
 231                                         GSS_C_NULL_OID,
 232                                         &desired_targname);
 233
 234
 235         major_status = gss_display_name(&status,
 236                                         desired_targname,
 237                                         &output_name_buffer,
 238                                         &output_name_type);
 239
 240         printf("target is '%s'\n", output_name_buffer.value); fflush(stdout);
 241
 242         major_status = gss_release_buffer(&status, &output_name_buffer);
 243
 244         input_chan_bindings = (gss_channel_bindings)
 245           malloc(sizeof(gss_channel_bindings_desc));
 246
 247         input_chan_bindings->initiator_addrtype = GSS_C_AF_INET;
 248         input_chan_bindings->initiator_address.length = 4;
 249         address = (char *) malloc(4);
 250         input_chan_bindings->initiator_address.value = (char *) address;
 251         address[0] = ((from_addr & 0xff000000) >> 24);
 252         address[1] = ((from_addr & 0xff0000) >> 16);
 253         address[2] = ((from_addr & 0xff00) >> 8);
 254         address[3] = (from_addr & 0xff);
 255         input_chan_bindings->acceptor_addrtype = GSS_C_AF_INET;
 256         input_chan_bindings->acceptor_address.length = 4;
 257         address = (char *) malloc(4);
 258         input_chan_bindings->acceptor_address.value = (char *) address;
 259         address[0] = ((to_addr & 0xff000000) >> 24);
 260         address[1] = ((to_addr & 0xff0000) >> 16);
 261         address[2] = ((to_addr & 0xff00) >> 8);
 262         address[3] = (to_addr & 0xff);
 263         input_chan_bindings->application_data.length = 0;
 264
 265         req_flags = 0;
 266         if (deleg_flag)  req_flags = req_flags | 1;
 267         if (mutual_flag) req_flags = req_flags | 2;
 268         if (replay_flag) req_flags = req_flags | 4;
 269         if (seq_flag)    req_flags = req_flags | 8;
 270
 271         major_status = gss_init_sec_context(&status,         /* minor status */
 272                                         GSS_C_NO_CREDENTIAL, /* cred handle */
 273                                         &actual_ctxhandle,   /* ctx handle */
 274                                         desired_targname,    /* target name */
 275                                         GSS_C_NULL_OID,      /* mech type */
 276                                         req_flags,           /* req flags */
 277                                         0,                   /* time req */
 278                                         input_chan_bindings, /* chan binding */
 279                                         GSS_C_NO_BUFFER,     /* input token */
 280                                         &actual_mech_type,   /* actual mech */
 281                                         &output_token,       /* output token */
 282                                         &ret_flags,          /* ret flags */
 283                                         &lifetime_rec);      /* time rec */
 284
 285         if ((major_status != GSS_S_COMPLETE) &&
 286             (major_status != GSS_S_CONTINUE_NEEDED)) {
 287           gss_display_status(&new_status,
 288                                 status,
 289                                 GSS_C_MECH_CODE,
 290                                 GSS_C_NULL_OID,
 291                                 &msg_ctx,
 292                                 &status_string);
 293           printf("%s\n", status_string.value);
 294           return(0);
 295         }
 296
 297         if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
 298                 return(0);
 299         }
 300
 301         if (!Data(ap, SPX_AUTH, output_token.value, output_token.length)) {
 302                 return(0);
 303         }
 304
 305         return(1);
 306 }
 307
 308         void
 309 spx_is(ap, data, cnt)
 310         Authenticator *ap;
 311         unsigned char *data;
 312         int cnt;
 313 {
 314         Session_Key skey;
 315         des_cblock datablock;
 316         int r;
 317
 318         if (cnt-- < 1)
 319                 return;
 320         switch (*data++) {
 321         case SPX_AUTH:
 322                 input_token.length = cnt;
 323                 input_token.value = (char *) data;
 324
 325                 gethostname(lhostname, sizeof(lhostname));
 326
 327                 snprintf(targ_printable, sizeof(targ_printable),
 328                          "SERVICE:rcmd@%s", lhostname);
 329
 330                 input_name_buffer.length = strlen(targ_printable);
 331                 input_name_buffer.value = targ_printable;
 332
 333                 major_status = gss_import_name(&status,
 334                                         &input_name_buffer,
 335                                         GSS_C_NULL_OID,
 336                                         &desired_targname);
 337
 338                 major_status = gss_acquire_cred(&status,
 339                                         desired_targname,
 340                                         0,
 341                                         GSS_C_NULL_OID_SET,
 342                                         GSS_C_ACCEPT,
 343                                         &gss_cred_handle,
 344                                         &actual_mechs,
 345                                         &lifetime_rec);
 346
 347                 major_status = gss_release_name(&status, desired_targname);
 348
 349                 input_chan_bindings = (gss_channel_bindings)
 350                   malloc(sizeof(gss_channel_bindings_desc));
 351
 352                 input_chan_bindings->initiator_addrtype = GSS_C_AF_INET;
 353                 input_chan_bindings->initiator_address.length = 4;
 354                 address = (char *) malloc(4);
 355                 input_chan_bindings->initiator_address.value = (char *) address;
 356                 address[0] = ((from_addr & 0xff000000) >> 24);
 357                 address[1] = ((from_addr & 0xff0000) >> 16);
 358                 address[2] = ((from_addr & 0xff00) >> 8);
 359                 address[3] = (from_addr & 0xff);
 360                 input_chan_bindings->acceptor_addrtype = GSS_C_AF_INET;
 361                 input_chan_bindings->acceptor_address.length = 4;
 362                 address = (char *) malloc(4);
 363                 input_chan_bindings->acceptor_address.value = (char *) address;
 364                 address[0] = ((to_addr & 0xff000000) >> 24);
 365                 address[1] = ((to_addr & 0xff0000) >> 16);
 366                 address[2] = ((to_addr & 0xff00) >> 8);
 367                 address[3] = (to_addr & 0xff);
 368                 input_chan_bindings->application_data.length = 0;
 369
 370                 major_status = gss_accept_sec_context(&status,
 371                                                 &context_handle,
 372                                                 gss_cred_handle,
 373                                                 &input_token,
 374                                                 input_chan_bindings,
 375                                                 &src_name,
 376                                                 &actual_mech_type,
 377                                                 &output_token,
 378                                                 &ret_flags,
 379                                                 &lifetime_rec,
 380                                                 &gss_delegated_cred_handle);
 381
 382
 383                 if (major_status != GSS_S_COMPLETE) {
 384
 385                   major_status = gss_display_name(&status,
 386                                         src_name,
 387                                         &fullname_buffer,
 388                                         &fullname_type);
 389                         Data(ap, SPX_REJECT, "auth failed", -1);
 390                         auth_finished(ap, AUTH_REJECT);
 391                         return;
 392                 }
 393
 394                 major_status = gss_display_name(&status,
 395                                         src_name,
 396                                         &fullname_buffer,
 397                                         &fullname_type);
 398
 399
 400                 Data(ap, SPX_ACCEPT, output_token.value, output_token.length);
 401                 auth_finished(ap, AUTH_USER);
 402                 break;
 403
 404         default:
 405                 Data(ap, SPX_REJECT, 0, 0);
 406                 break;
 407         }
 408 }
 409
 410
 411         void
 412 spx_reply(ap, data, cnt)
 413         Authenticator *ap;
 414         unsigned char *data;
 415         int cnt;
 416 {
 417         Session_Key skey;
 418
 419         if (cnt-- < 1)
 420                 return;
 421         switch (*data++) {
 422         case SPX_REJECT:
 423                 if (cnt > 0) {
 424                         printf("[ SPX refuses authentication because %.*s ]\r\n",
 425                                 cnt, data);
 426                 } else
 427                         printf("[ SPX refuses authentication ]\r\n");
 428                 auth_send_retry();
 429                 return;
 430         case SPX_ACCEPT:
 431                 printf("[ SPX accepts you ]\r\n");
 432                 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
 433                         /*
 434                          * Send over the encrypted challenge.
 435                          */
 436                   input_token.value = (char *) data;
 437                   input_token.length = cnt;
 438
 439                   major_status = gss_init_sec_context(&status, /* minor stat */
 440                                         GSS_C_NO_CREDENTIAL, /* cred handle */
 441                                         &actual_ctxhandle,   /* ctx handle */
 442                                         desired_targname,    /* target name */
 443                                         GSS_C_NULL_OID,      /* mech type */
 444                                         req_flags,           /* req flags */
 445                                         0,                   /* time req */
 446                                         input_chan_bindings, /* chan binding */
 447                                         &input_token,        /* input token */
 448                                         &actual_mech_type,   /* actual mech */
 449                                         &output_token,       /* output token */
 450                                         &ret_flags,          /* ret flags */
 451                                         &lifetime_rec);      /* time rec */
 452
 453                   if (major_status != GSS_S_COMPLETE) {
 454                     gss_display_status(&new_status,
 455                                         status,
 456                                         GSS_C_MECH_CODE,
 457                                         GSS_C_NULL_OID,
 458                                         &msg_ctx,
 459                                         &status_string);
 460                     printf("[ SPX mutual response fails ... '%s' ]\r\n",
 461                          status_string.value);
 462                     auth_send_retry();
 463                     return;
 464                   }
 465                 }
 466                 auth_finished(ap, AUTH_USER);
 467                 return;
 468
 469         default:
 470                 return;
 471         }
 472 }
 473
 474         int
 475 spx_status(ap, name, name_sz, level)
 476         Authenticator *ap;
 477         char *name;
 478         size_t name_sz;
 479         int level;
 480 {
 481
 482         gss_buffer_desc  fullname_buffer, acl_file_buffer;
 483         gss_OID          fullname_type;
 484         char acl_file[160], fullname[160];
 485         int major_status, status = 0;
 486         struct passwd  *pwd;
 487
 488         /*
 489          * hard code fullname to
 490          *   "SPX:/C=US/O=Digital/OU=LKG/OU=Sphinx/OU=Users/CN=Kannan Alagappan"
 491          * and acl_file to "~kannan/.sphinx"
 492          */
 493
 494         pwd = k_getpwnam(UserNameRequested);
 495         if (pwd == NULL) {
 496           return(AUTH_USER);   /*  not authenticated  */
 497         }
 498
 499         snprintf (acl_file, sizeof(acl_file),
 500                   "%s/.sphinx", pwd->pw_dir);
 501
 502         acl_file_buffer.value = acl_file;
 503         acl_file_buffer.length = strlen(acl_file);
 504
 505         major_status = gss_display_name(&status,
 506                                         src_name,
 507                                         &fullname_buffer,
 508                                         &fullname_type);
 509
 510         if (level < AUTH_USER)
 511                 return(level);
 512
 513         major_status = gss__check_acl(&status, &fullname_buffer,
 514                                         &acl_file_buffer);
 515
 516         if (major_status == GSS_S_COMPLETE) {
 517           strlcpy(name, UserNameRequested, name_sz);
 518           return(AUTH_VALID);
 519         } else {
 520            return(AUTH_USER);
 521         }
 522
 523 }
 524
 525 #define BUMP(buf, len)          while (*(buf)) {++(buf), --(len);}
 526 #define ADDC(buf, len, c)       if ((len) > 0) {*(buf)++ = (c); --(len);}
 527
 528         void
 529 spx_printsub(data, cnt, buf, buflen)
 530         unsigned char *data, *buf;
 531         int cnt, buflen;
 532 {
 533         int i;
 534
 535         buf[buflen-1] = '\0';           /* make sure its NULL terminated */
 536         buflen -= 1;
 537
 538         switch(data[3]) {
 539         case SPX_REJECT:                /* Rejected (reason might follow) */
 540                 strlcpy((char *)buf, " REJECT ", buflen);
 541                 goto common;
 542
 543         case SPX_ACCEPT:                /* Accepted (name might follow) */
 544                 strlcpy((char *)buf, " ACCEPT ", buflen);
 545         common:
 546                 BUMP(buf, buflen);
 547                 if (cnt <= 4)
 548                         break;
 549                 ADDC(buf, buflen, '"');
 550                 for (i = 4; i < cnt; i++)
 551                         ADDC(buf, buflen, data[i]);
 552                 ADDC(buf, buflen, '"');
 553                 ADDC(buf, buflen, '\0');
 554                 break;
 555
 556         case SPX_AUTH:                  /* Authentication data follows */
 557                 strlcpy((char *)buf, " AUTH", buflen);
 558                 goto common2;
 559
 560         default:
 561                 snprintf(buf, buflen, " %d (unknown)", data[3]);
 562         common2:
 563                 BUMP(buf, buflen);
 564                 for (i = 4; i < cnt; i++) {
 565                         snprintf(buf, buflen, " %d", data[i]);
 566                         BUMP(buf, buflen);
 567                 }
 568                 break;
 569         }
 570 }
 571
 572 #endif
 573
 574 #ifdef notdef
 575
 576 prkey(msg, key)
 577         char *msg;
 578         unsigned char *key;
 579 {
 580         int i;
 581         printf("%s:", msg);
 582         for (i = 0; i < 8; i++)
 583                 printf(" %3d", key[i]);
 584         printf("\r\n");
 585 }
 586 #endif