crypto/heimdal/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("$Id$");
  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", (int)output_name_buffer.length,
 241                                         (char*)output_name_buffer.value);
 242         fflush(stdout);
 243
 244         major_status = gss_release_buffer(&status, &output_name_buffer);
 245
 246         input_chan_bindings = (gss_channel_bindings)
 247           malloc(sizeof(gss_channel_bindings_desc));
 248
 249         input_chan_bindings->initiator_addrtype = GSS_C_AF_INET;
 250         input_chan_bindings->initiator_address.length = 4;
 251         address = (char *) malloc(4);
 252         input_chan_bindings->initiator_address.value = (char *) address;
 253         address[0] = ((from_addr & 0xff000000) >> 24);
 254         address[1] = ((from_addr & 0xff0000) >> 16);
 255         address[2] = ((from_addr & 0xff00) >> 8);
 256         address[3] = (from_addr & 0xff);
 257         input_chan_bindings->acceptor_addrtype = GSS_C_AF_INET;
 258         input_chan_bindings->acceptor_address.length = 4;
 259         address = (char *) malloc(4);
 260         input_chan_bindings->acceptor_address.value = (char *) address;
 261         address[0] = ((to_addr & 0xff000000) >> 24);
 262         address[1] = ((to_addr & 0xff0000) >> 16);
 263         address[2] = ((to_addr & 0xff00) >> 8);
 264         address[3] = (to_addr & 0xff);
 265         input_chan_bindings->application_data.length = 0;
 266
 267         req_flags = 0;
 268         if (deleg_flag)  req_flags = req_flags | 1;
 269         if (mutual_flag) req_flags = req_flags | 2;
 270         if (replay_flag) req_flags = req_flags | 4;
 271         if (seq_flag)    req_flags = req_flags | 8;
 272
 273         major_status = gss_init_sec_context(&status,         /* minor status */
 274                                         GSS_C_NO_CREDENTIAL, /* cred handle */
 275                                         &actual_ctxhandle,   /* ctx handle */
 276                                         desired_targname,    /* target name */
 277                                         GSS_C_NULL_OID,      /* mech type */
 278                                         req_flags,           /* req flags */
 279                                         0,                   /* time req */
 280                                         input_chan_bindings, /* chan binding */
 281                                         GSS_C_NO_BUFFER,     /* input token */
 282                                         &actual_mech_type,   /* actual mech */
 283                                         &output_token,       /* output token */
 284                                         &ret_flags,          /* ret flags */
 285                                         &lifetime_rec);      /* time rec */
 286
 287         if ((major_status != GSS_S_COMPLETE) &&
 288             (major_status != GSS_S_CONTINUE_NEEDED)) {
 289           gss_display_status(&new_status,
 290                                 status,
 291                                 GSS_C_MECH_CODE,
 292                                 GSS_C_NULL_OID,
 293                                 &msg_ctx,
 294                                 &status_string);
 295           printf("%.*s\n", (int)status_string.length,
 296                                 (char*)status_string.value);
 297           return(0);
 298         }
 299
 300         if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
 301                 return(0);
 302         }
 303
 304         if (!Data(ap, SPX_AUTH, output_token.value, output_token.length)) {
 305                 return(0);
 306         }
 307
 308         return(1);
 309 }
 310
 311         void
 312 spx_is(ap, data, cnt)
 313         Authenticator *ap;
 314         unsigned char *data;
 315         int cnt;
 316 {
 317         Session_Key skey;
 318         des_cblock datablock;
 319         int r;
 320
 321         if (cnt-- < 1)
 322                 return;
 323         switch (*data++) {
 324         case SPX_AUTH:
 325                 input_token.length = cnt;
 326                 input_token.value = (char *) data;
 327
 328                 gethostname(lhostname, sizeof(lhostname));
 329
 330                 snprintf(targ_printable, sizeof(targ_printable),
 331                          "SERVICE:rcmd@%s", lhostname);
 332
 333                 input_name_buffer.length = strlen(targ_printable);
 334                 input_name_buffer.value = targ_printable;
 335
 336                 major_status = gss_import_name(&status,
 337                                         &input_name_buffer,
 338                                         GSS_C_NULL_OID,
 339                                         &desired_targname);
 340
 341                 major_status = gss_acquire_cred(&status,
 342                                         desired_targname,
 343                                         0,
 344                                         GSS_C_NULL_OID_SET,
 345                                         GSS_C_ACCEPT,
 346                                         &gss_cred_handle,
 347                                         &actual_mechs,
 348                                         &lifetime_rec);
 349
 350                 major_status = gss_release_name(&status, desired_targname);
 351
 352                 input_chan_bindings = (gss_channel_bindings)
 353                   malloc(sizeof(gss_channel_bindings_desc));
 354
 355                 input_chan_bindings->initiator_addrtype = GSS_C_AF_INET;
 356                 input_chan_bindings->initiator_address.length = 4;
 357                 address = (char *) malloc(4);
 358                 input_chan_bindings->initiator_address.value = (char *) address;
 359                 address[0] = ((from_addr & 0xff000000) >> 24);
 360                 address[1] = ((from_addr & 0xff0000) >> 16);
 361                 address[2] = ((from_addr & 0xff00) >> 8);
 362                 address[3] = (from_addr & 0xff);
 363                 input_chan_bindings->acceptor_addrtype = GSS_C_AF_INET;
 364                 input_chan_bindings->acceptor_address.length = 4;
 365                 address = (char *) malloc(4);
 366                 input_chan_bindings->acceptor_address.value = (char *) address;
 367                 address[0] = ((to_addr & 0xff000000) >> 24);
 368                 address[1] = ((to_addr & 0xff0000) >> 16);
 369                 address[2] = ((to_addr & 0xff00) >> 8);
 370                 address[3] = (to_addr & 0xff);
 371                 input_chan_bindings->application_data.length = 0;
 372
 373                 major_status = gss_accept_sec_context(&status,
 374                                                 &context_handle,
 375                                                 gss_cred_handle,
 376                                                 &input_token,
 377                                                 input_chan_bindings,
 378                                                 &src_name,
 379                                                 &actual_mech_type,
 380                                                 &output_token,
 381                                                 &ret_flags,
 382                                                 &lifetime_rec,
 383                                                 &gss_delegated_cred_handle);
 384
 385
 386                 if (major_status != GSS_S_COMPLETE) {
 387
 388                   major_status = gss_display_name(&status,
 389                                         src_name,
 390                                         &fullname_buffer,
 391                                         &fullname_type);
 392                         Data(ap, SPX_REJECT, "auth failed", -1);
 393                         auth_finished(ap, AUTH_REJECT);
 394                         return;
 395                 }
 396
 397                 major_status = gss_display_name(&status,
 398                                         src_name,
 399                                         &fullname_buffer,
 400                                         &fullname_type);
 401
 402
 403                 Data(ap, SPX_ACCEPT, output_token.value, output_token.length);
 404                 auth_finished(ap, AUTH_USER);
 405                 break;
 406
 407         default:
 408                 Data(ap, SPX_REJECT, 0, 0);
 409                 break;
 410         }
 411 }
 412
 413
 414         void
 415 spx_reply(ap, data, cnt)
 416         Authenticator *ap;
 417         unsigned char *data;
 418         int cnt;
 419 {
 420         Session_Key skey;
 421
 422         if (cnt-- < 1)
 423                 return;
 424         switch (*data++) {
 425         case SPX_REJECT:
 426                 if (cnt > 0) {
 427                         printf("[ SPX refuses authentication because %.*s ]\r\n",
 428                                 cnt, data);
 429                 } else
 430                         printf("[ SPX refuses authentication ]\r\n");
 431                 auth_send_retry();
 432                 return;
 433         case SPX_ACCEPT:
 434                 printf("[ SPX accepts you ]\r\n");
 435                 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
 436                         /*
 437                          * Send over the encrypted challenge.
 438                          */
 439                   input_token.value = (char *) data;
 440                   input_token.length = cnt;
 441
 442                   major_status = gss_init_sec_context(&status, /* minor stat */
 443                                         GSS_C_NO_CREDENTIAL, /* cred handle */
 444                                         &actual_ctxhandle,   /* ctx handle */
 445                                         desired_targname,    /* target name */
 446                                         GSS_C_NULL_OID,      /* mech type */
 447                                         req_flags,           /* req flags */
 448                                         0,                   /* time req */
 449                                         input_chan_bindings, /* chan binding */
 450                                         &input_token,        /* input token */
 451                                         &actual_mech_type,   /* actual mech */
 452                                         &output_token,       /* output token */
 453                                         &ret_flags,          /* ret flags */
 454                                         &lifetime_rec);      /* time rec */
 455
 456                   if (major_status != GSS_S_COMPLETE) {
 457                     gss_display_status(&new_status,
 458                                         status,
 459                                         GSS_C_MECH_CODE,
 460                                         GSS_C_NULL_OID,
 461                                         &msg_ctx,
 462                                         &status_string);
 463                     printf("[ SPX mutual response fails ... '%.*s' ]\r\n",
 464                          (int)status_string.length,
 465                          (char*)status_string.value);
 466                     auth_send_retry();
 467                     return;
 468                   }
 469                 }
 470                 auth_finished(ap, AUTH_USER);
 471                 return;
 472
 473         default:
 474                 return;
 475         }
 476 }
 477
 478         int
 479 spx_status(ap, name, name_sz, level)
 480         Authenticator *ap;
 481         char *name;
 482         size_t name_sz;
 483         int level;
 484 {
 485
 486         gss_buffer_desc  fullname_buffer, acl_file_buffer;
 487         gss_OID          fullname_type;
 488         char acl_file[160], fullname[160];
 489         int major_status, status = 0;
 490         struct passwd  *pwd;
 491
 492         /*
 493          * hard code fullname to
 494          *   "SPX:/C=US/O=Digital/OU=LKG/OU=Sphinx/OU=Users/CN=Kannan Alagappan"
 495          * and acl_file to "~kannan/.sphinx"
 496          */
 497
 498         pwd = k_getpwnam(UserNameRequested);
 499         if (pwd == NULL) {
 500           return(AUTH_USER);   /*  not authenticated  */
 501         }
 502
 503         snprintf (acl_file, sizeof(acl_file),
 504                   "%s/.sphinx", pwd->pw_dir);
 505
 506         acl_file_buffer.value = acl_file;
 507         acl_file_buffer.length = strlen(acl_file);
 508
 509         major_status = gss_display_name(&status,
 510                                         src_name,
 511                                         &fullname_buffer,
 512                                         &fullname_type);
 513
 514         if (level < AUTH_USER)
 515                 return(level);
 516
 517         major_status = gss__check_acl(&status, &fullname_buffer,
 518                                         &acl_file_buffer);
 519
 520         if (major_status == GSS_S_COMPLETE) {
 521           strlcpy(name, UserNameRequested, name_sz);
 522           return(AUTH_VALID);
 523         } else {
 524            return(AUTH_USER);
 525         }
 526
 527 }
 528
 529 #define BUMP(buf, len)          while (*(buf)) {++(buf), --(len);}
 530 #define ADDC(buf, len, c)       if ((len) > 0) {*(buf)++ = (c); --(len);}
 531
 532         void
 533 spx_printsub(unsigned char *data, size_t cnt,
 534              unsigned char *buf, size_t buflen)
 535 {
 536         size_t i;
 537
 538         buf[buflen-1] = '\0';           /* make sure it's NULL terminated */
 539         buflen -= 1;
 540
 541         switch(data[3]) {
 542         case SPX_REJECT:                /* Rejected (reason might follow) */
 543                 strlcpy((char *)buf, " REJECT ", buflen);
 544                 goto common;
 545
 546         case SPX_ACCEPT:                /* Accepted (name might follow) */
 547                 strlcpy((char *)buf, " ACCEPT ", buflen);
 548         common:
 549                 BUMP(buf, buflen);
 550                 if (cnt <= 4)
 551                         break;
 552                 ADDC(buf, buflen, '"');
 553                 for (i = 4; i < cnt; i++)
 554                         ADDC(buf, buflen, data[i]);
 555                 ADDC(buf, buflen, '"');
 556                 ADDC(buf, buflen, '\0');
 557                 break;
 558
 559         case SPX_AUTH:                  /* Authentication data follows */
 560                 strlcpy((char *)buf, " AUTH", buflen);
 561                 goto common2;
 562
 563         default:
 564                 snprintf(buf, buflen, " %d (unknown)", data[3]);
 565         common2:
 566                 BUMP(buf, buflen);
 567                 for (i = 4; i < cnt; i++) {
 568                         snprintf(buf, buflen, " %d", data[i]);
 569                         BUMP(buf, buflen);
 570                 }
 571                 break;
 572         }
 573 }
 574
 575 #endif
 576
 577 #ifdef notdef
 578
 579 prkey(msg, key)
 580         char *msg;
 581         unsigned char *key;
 582 {
 583         int i;
 584         printf("%s:", msg);
 585         for (i = 0; i < 8; i++)
 586                 printf(" %3d", key[i]);
 587         printf("\r\n");
 588 }
 589 #endif