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#include <sys/cdefs.h> 35 36__FBSDID("$FreeBSD: releng/10.2/contrib/telnet/libtelnet/encrypt.c 228843 2011-12-23 15:00:37Z cperciva $"); 37 38#ifndef lint 39#if 0 40static const char sccsid[] = "@(#)encrypt.c 8.2 (Berkeley) 5/30/95"; 41#endif 42#endif /* not lint */ 43 44/* 45 * Copyright (C) 1990 by the Massachusetts Institute of Technology 46 * 47 * Export of this software from the United States of America is assumed 48 * to require a specific license from the United States Government. 49 * It is the responsibility of any person or organization contemplating 50 * export to obtain such a license before exporting. 51 * 52 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 53 * distribute this software and its documentation for any purpose and 54 * without fee is hereby granted, provided that the above copyright 55 * notice appear in all copies and that both that copyright notice and 56 * this permission notice appear in supporting documentation, and that 57 * the name of M.I.T. not be used in advertising or publicity pertaining 58 * to distribution of the software without specific, written prior 59 * permission. M.I.T. makes no representations about the suitability of 60 * this software for any purpose. It is provided "as is" without express 61 * or implied warranty. 62 */ 63 64#ifdef ENCRYPTION 65 66#include <sys/types.h> 67#define ENCRYPT_NAMES 68#include <arpa/telnet.h> 69#include <stdio.h> 70#include <stdlib.h> 71#include <string.h> 72 73#include "encrypt.h" 74#include "misc.h" 75 76/* 77 * These functions pointers point to the current routines 78 * for encrypting and decrypting data. 79 */ 80void (*encrypt_output)(unsigned char *, int); 81int (*decrypt_input)(int); 82 83int EncryptType(char *type, char *mode); 84int EncryptStart(char *mode); 85int EncryptStop(char *mode); 86int EncryptStartInput(void); 87int EncryptStartOutput(void); 88int EncryptStopInput(void); 89int EncryptStopOutput(void); 90 91int encrypt_debug_mode = 0; 92static int decrypt_mode = 0; 93static int encrypt_mode = 0; 94static int encrypt_verbose = 0; 95static int autoencrypt = 0; 96static int autodecrypt = 0; 97static int havesessionkey = 0; 98static int Server = 0; 99static const char *Name = "Noname"; 100 101#define typemask(x) ((x) > 0 ? 1 << ((x)-1) : 0) 102 103static u_long i_support_encrypt = 0 104 | typemask(ENCTYPE_DES_CFB64) | typemask(ENCTYPE_DES_OFB64) 105 |0; 106static u_long i_support_decrypt = 0 107 | typemask(ENCTYPE_DES_CFB64) | typemask(ENCTYPE_DES_OFB64) 108 |0; 109 110static u_long i_wont_support_encrypt = 0; 111static u_long i_wont_support_decrypt = 0; 112#define I_SUPPORT_ENCRYPT (i_support_encrypt & ~i_wont_support_encrypt) 113#define I_SUPPORT_DECRYPT (i_support_decrypt & ~i_wont_support_decrypt) 114 115static u_long remote_supports_encrypt = 0; 116static u_long remote_supports_decrypt = 0; 117 118static Encryptions encryptions[] = { 119 { "DES_CFB64", ENCTYPE_DES_CFB64, 120 cfb64_encrypt, 121 cfb64_decrypt, 122 cfb64_init, 123 cfb64_start, 124 cfb64_is, 125 cfb64_reply, 126 cfb64_session, 127 cfb64_keyid, 128 cfb64_printsub }, 129 { "DES_OFB64", ENCTYPE_DES_OFB64, 130 ofb64_encrypt, 131 ofb64_decrypt, 132 ofb64_init, 133 ofb64_start, 134 ofb64_is, 135 ofb64_reply, 136 ofb64_session, 137 ofb64_keyid, 138 ofb64_printsub }, 139 { NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 140}; 141 142static unsigned char str_send[64] = { IAC, SB, TELOPT_ENCRYPT, 143 ENCRYPT_SUPPORT }; 144static unsigned char str_suplen = 0; 145static unsigned char str_start[72] = { IAC, SB, TELOPT_ENCRYPT }; 146static unsigned char str_end[] = { IAC, SB, TELOPT_ENCRYPT, 0, IAC, SE }; 147 148Encryptions * 149findencryption(int type) 150{ 151 Encryptions *ep = encryptions; 152 153 if (!(I_SUPPORT_ENCRYPT & remote_supports_decrypt & (unsigned)typemask(type))) 154 return(0); 155 while (ep->type && ep->type != type) 156 ++ep; 157 return(ep->type ? ep : 0); 158} 159 160static Encryptions * 161finddecryption(int type) 162{ 163 Encryptions *ep = encryptions; 164 165 if (!(I_SUPPORT_DECRYPT & remote_supports_encrypt & (unsigned)typemask(type))) 166 return(0); 167 while (ep->type && ep->type != type) 168 ++ep; 169 return(ep->type ? ep : 0); 170} 171 172#define MAXKEYLEN 64 173 174static struct key_info { 175 unsigned char keyid[MAXKEYLEN]; 176 int keylen; 177 int dir; 178 int *modep; 179 Encryptions *(*getcrypt)(int); 180} ki[2] = { 181 { { 0 }, 0, DIR_ENCRYPT, &encrypt_mode, findencryption }, 182 { { 0 }, 0, DIR_DECRYPT, &decrypt_mode, finddecryption }, 183}; 184 185static void encrypt_keyid(struct key_info *kp, unsigned char *keyid, int len); 186 187void 188encrypt_init(const char *name, int server) 189{ 190 Encryptions *ep = encryptions; 191 192 Name = name; 193 Server = server; 194 i_support_encrypt = i_support_decrypt = 0; 195 remote_supports_encrypt = remote_supports_decrypt = 0; 196 encrypt_mode = 0; 197 decrypt_mode = 0; 198 encrypt_output = 0; 199 decrypt_input = 0; 200 201 str_suplen = 4; 202 203 while (ep->type) { 204 if (encrypt_debug_mode) 205 printf(">>>%s: I will support %s\r\n", 206 Name, ENCTYPE_NAME(ep->type)); 207 i_support_encrypt |= typemask(ep->type); 208 i_support_decrypt |= typemask(ep->type); 209 if ((i_wont_support_decrypt & typemask(ep->type)) == 0) 210 if ((str_send[str_suplen++] = ep->type) == IAC) 211 str_send[str_suplen++] = IAC; 212 if (ep->init) 213 (*ep->init)(Server); 214 ++ep; 215 } 216 str_send[str_suplen++] = IAC; 217 str_send[str_suplen++] = SE; 218} 219 220static void 221encrypt_list_types(void) 222{ 223 Encryptions *ep = encryptions; 224 225 printf("Valid encryption types:\n"); 226 while (ep->type) { 227 printf("\t%s (%d)\r\n", ENCTYPE_NAME(ep->type), ep->type); 228 ++ep; 229 } 230} 231 232int 233EncryptEnable(char *type, char *mode) 234{ 235 if (isprefix(type, "help") || isprefix(type, "?")) { 236 printf("Usage: encrypt enable <type> [input|output]\n"); 237 encrypt_list_types(); 238 return(0); 239 } 240 if (EncryptType(type, mode)) 241 return(EncryptStart(mode)); 242 return(0); 243} 244 245int 246EncryptDisable(char *type, char *mode) 247{ 248 Encryptions *ep; 249 int ret = 0; 250 251 if (isprefix(type, "help") || isprefix(type, "?")) { 252 printf("Usage: encrypt disable <type> [input|output]\n"); 253 encrypt_list_types(); 254 } else if ((ep = (Encryptions *)genget(type, (char **)encryptions, 255 sizeof(Encryptions))) == 0) { 256 printf("%s: invalid encryption type\n", type); 257 } else if (Ambiguous((char **)ep)) { 258 printf("Ambiguous type '%s'\n", type); 259 } else { 260 if ((mode == 0) || (isprefix(mode, "input") ? 1 : 0)) { 261 if (decrypt_mode == ep->type) 262 EncryptStopInput(); 263 i_wont_support_decrypt |= typemask(ep->type); 264 ret = 1; 265 } 266 if ((mode == 0) || (isprefix(mode, "output"))) { 267 if (encrypt_mode == ep->type) 268 EncryptStopOutput(); 269 i_wont_support_encrypt |= typemask(ep->type); 270 ret = 1; 271 } 272 if (ret == 0) 273 printf("%s: invalid encryption mode\n", mode); 274 } 275 return(ret); 276} 277 278int 279EncryptType(char *type, char *mode) 280{ 281 Encryptions *ep; 282 int ret = 0; 283 284 if (isprefix(type, "help") || isprefix(type, "?")) { 285 printf("Usage: encrypt type <type> [input|output]\n"); 286 encrypt_list_types(); 287 } else if ((ep = (Encryptions *)genget(type, (char **)encryptions, 288 sizeof(Encryptions))) == 0) { 289 printf("%s: invalid encryption type\n", type); 290 } else if (Ambiguous((char **)ep)) { 291 printf("Ambiguous type '%s'\n", type); 292 } else { 293 if ((mode == 0) || isprefix(mode, "input")) { 294 decrypt_mode = ep->type; 295 i_wont_support_decrypt &= ~typemask(ep->type); 296 ret = 1; 297 } 298 if ((mode == 0) || isprefix(mode, "output")) { 299 encrypt_mode = ep->type; 300 i_wont_support_encrypt &= ~typemask(ep->type); 301 ret = 1; 302 } 303 if (ret == 0) 304 printf("%s: invalid encryption mode\n", mode); 305 } 306 return(ret); 307} 308 309int 310EncryptStart(char *mode) 311{ 312 int ret = 0; 313 if (mode) { 314 if (isprefix(mode, "input")) 315 return(EncryptStartInput()); 316 if (isprefix(mode, "output")) 317 return(EncryptStartOutput()); 318 if (isprefix(mode, "help") || isprefix(mode, "?")) { 319 printf("Usage: encrypt start [input|output]\n"); 320 return(0); 321 } 322 printf("%s: invalid encryption mode 'encrypt start ?' for help\n", mode); 323 return(0); 324 } 325 ret += EncryptStartInput(); 326 ret += EncryptStartOutput(); 327 return(ret); 328} 329 330int 331EncryptStartInput(void) 332{ 333 if (decrypt_mode) { 334 encrypt_send_request_start(); 335 return(1); 336 } 337 printf("No previous decryption mode, decryption not enabled\r\n"); 338 return(0); 339} 340 341int 342EncryptStartOutput(void) 343{ 344 if (encrypt_mode) { 345 encrypt_start_output(encrypt_mode); 346 return(1); 347 } 348 printf("No previous encryption mode, encryption not enabled\r\n"); 349 return(0); 350} 351 352int 353EncryptStop(char *mode) 354{ 355 int ret = 0; 356 if (mode) { 357 if (isprefix(mode, "input")) 358 return(EncryptStopInput()); 359 if (isprefix(mode, "output")) 360 return(EncryptStopOutput()); 361 if (isprefix(mode, "help") || isprefix(mode, "?")) { 362 printf("Usage: encrypt stop [input|output]\n"); 363 return(0); 364 } 365 printf("%s: invalid encryption mode 'encrypt stop ?' for help\n", mode); 366 return(0); 367 } 368 ret += EncryptStopInput(); 369 ret += EncryptStopOutput(); 370 return(ret); 371} 372 373int 374EncryptStopInput(void) 375{ 376 encrypt_send_request_end(); 377 return(1); 378} 379 380int 381EncryptStopOutput(void) 382{ 383 encrypt_send_end(); 384 return(1); 385} 386 387void 388encrypt_display(void) 389{ 390 if (encrypt_output) 391 printf("Currently encrypting output with %s\r\n", 392 ENCTYPE_NAME(encrypt_mode)); 393 if (decrypt_input) 394 printf("Currently decrypting input with %s\r\n", 395 ENCTYPE_NAME(decrypt_mode)); 396} 397 398int 399EncryptStatus(void) 400{ 401 if (encrypt_output) 402 printf("Currently encrypting output with %s\r\n", 403 ENCTYPE_NAME(encrypt_mode)); 404 else if (encrypt_mode) { 405 printf("Currently output is clear text.\r\n"); 406 printf("Last encryption mode was %s\r\n", 407 ENCTYPE_NAME(encrypt_mode)); 408 } 409 if (decrypt_input) { 410 printf("Currently decrypting input with %s\r\n", 411 ENCTYPE_NAME(decrypt_mode)); 412 } else if (decrypt_mode) { 413 printf("Currently input is clear text.\r\n"); 414 printf("Last decryption mode was %s\r\n", 415 ENCTYPE_NAME(decrypt_mode)); 416 } 417 return 1; 418} 419 420void 421encrypt_send_support(void) 422{ 423 if (str_suplen) { 424 /* 425 * If the user has requested that decryption start 426 * immediatly, then send a "REQUEST START" before 427 * we negotiate the type. 428 */ 429 if (!Server && autodecrypt) 430 encrypt_send_request_start(); 431 net_write(str_send, str_suplen); 432 printsub('>', &str_send[2], str_suplen - 2); 433 str_suplen = 0; 434 } 435} 436 437int 438EncryptDebug(int on) 439{ 440 if (on < 0) 441 encrypt_debug_mode ^= 1; 442 else 443 encrypt_debug_mode = on; 444 printf("Encryption debugging %s\r\n", 445 encrypt_debug_mode ? "enabled" : "disabled"); 446 return(1); 447} 448 449int 450EncryptVerbose(int on) 451{ 452 if (on < 0) 453 encrypt_verbose ^= 1; 454 else 455 encrypt_verbose = on; 456 printf("Encryption %s verbose\r\n", 457 encrypt_verbose ? "is" : "is not"); 458 return(1); 459} 460 461int 462EncryptAutoEnc(int on) 463{ 464 encrypt_auto(on); 465 printf("Automatic encryption of output is %s\r\n", 466 autoencrypt ? "enabled" : "disabled"); 467 return(1); 468} 469 470int 471EncryptAutoDec(int on) 472{ 473 decrypt_auto(on); 474 printf("Automatic decryption of input is %s\r\n", 475 autodecrypt ? "enabled" : "disabled"); 476 return(1); 477} 478 479/* 480 * Called when ENCRYPT SUPPORT is received. 481 */ 482void 483encrypt_support(unsigned char *typelist, int cnt) 484{ 485 int type, use_type = 0; 486 Encryptions *ep; 487 488 /* 489 * Forget anything the other side has previously told us. 490 */ 491 remote_supports_decrypt = 0; 492 493 while (cnt-- > 0) { 494 type = *typelist++; 495 if (encrypt_debug_mode) 496 printf(">>>%s: He is supporting %s (%d)\r\n", 497 Name, 498 ENCTYPE_NAME(type), type); 499 if ((type < ENCTYPE_CNT) && 500 (I_SUPPORT_ENCRYPT & typemask(type))) { 501 remote_supports_decrypt |= typemask(type); 502 if (use_type == 0) 503 use_type = type; 504 } 505 } 506 if (use_type) { 507 ep = findencryption(use_type); 508 if (!ep) 509 return; 510 type = ep->start ? (*ep->start)(DIR_ENCRYPT, Server) : 0; 511 if (encrypt_debug_mode) 512 printf(">>>%s: (*ep->start)() returned %d\r\n", 513 Name, type); 514 if (type < 0) 515 return; 516 encrypt_mode = use_type; 517 if (type == 0) 518 encrypt_start_output(use_type); 519 } 520} 521 522void 523encrypt_is(unsigned char *data, int cnt) 524{ 525 Encryptions *ep; 526 int type, ret; 527 528 if (--cnt < 0) 529 return; 530 type = *data++; 531 if (type < ENCTYPE_CNT) 532 remote_supports_encrypt |= typemask(type); 533 if (!(ep = finddecryption(type))) { 534 if (encrypt_debug_mode) 535 printf(">>>%s: Can't find type %s (%d) for initial negotiation\r\n", 536 Name, 537 ENCTYPE_NAME_OK(type) 538 ? ENCTYPE_NAME(type) : "(unknown)", 539 type); 540 return; 541 } 542 if (!ep->is) { 543 if (encrypt_debug_mode) 544 printf(">>>%s: No initial negotiation needed for type %s (%d)\r\n", 545 Name, 546 ENCTYPE_NAME_OK(type) 547 ? ENCTYPE_NAME(type) : "(unknown)", 548 type); 549 ret = 0; 550 } else { 551 ret = (*ep->is)(data, cnt); 552 if (encrypt_debug_mode) 553 printf("(*ep->is)(%p, %d) returned %s(%d)\n", data, cnt, 554 (ret < 0) ? "FAIL " : 555 (ret == 0) ? "SUCCESS " : "MORE_TO_DO ", ret); 556 } 557 if (ret < 0) { 558 autodecrypt = 0; 559 } else { 560 decrypt_mode = type; 561 if (ret == 0 && autodecrypt) 562 encrypt_send_request_start(); 563 } 564} 565 566void 567encrypt_reply(unsigned char *data, int cnt) 568{ 569 Encryptions *ep; 570 int ret, type; 571 572 if (--cnt < 0) 573 return; 574 type = *data++; 575 if (!(ep = findencryption(type))) { 576 if (encrypt_debug_mode) 577 printf(">>>%s: Can't find type %s (%d) for initial negotiation\r\n", 578 Name, 579 ENCTYPE_NAME_OK(type) 580 ? ENCTYPE_NAME(type) : "(unknown)", 581 type); 582 return; 583 } 584 if (!ep->reply) { 585 if (encrypt_debug_mode) 586 printf(">>>%s: No initial negotiation needed for type %s (%d)\r\n", 587 Name, 588 ENCTYPE_NAME_OK(type) 589 ? ENCTYPE_NAME(type) : "(unknown)", 590 type); 591 ret = 0; 592 } else { 593 ret = (*ep->reply)(data, cnt); 594 if (encrypt_debug_mode) 595 printf("(*ep->reply)(%p, %d) returned %s(%d)\n", 596 data, cnt, 597 (ret < 0) ? "FAIL " : 598 (ret == 0) ? "SUCCESS " : "MORE_TO_DO ", ret); 599 } 600 if (encrypt_debug_mode) 601 printf(">>>%s: encrypt_reply returned %d\n", Name, ret); 602 if (ret < 0) { 603 autoencrypt = 0; 604 } else { 605 encrypt_mode = type; 606 if (ret == 0 && autoencrypt) 607 encrypt_start_output(type); 608 } 609} 610 611/* 612 * Called when a ENCRYPT START command is received. 613 */ 614void 615encrypt_start(unsigned char *data __unused, int cnt __unused) 616{ 617 Encryptions *ep; 618 619 if (!decrypt_mode) { 620 /* 621 * Something is wrong. We should not get a START 622 * command without having already picked our 623 * decryption scheme. Send a REQUEST-END to 624 * attempt to clear the channel... 625 */ 626 printf("%s: Warning, Cannot decrypt input stream!!!\r\n", Name); 627 encrypt_send_request_end(); 628 return; 629 } 630 631 if ((ep = finddecryption(decrypt_mode))) { 632 decrypt_input = ep->input; 633 if (encrypt_verbose) 634 printf("[ Input is now decrypted with type %s ]\r\n", 635 ENCTYPE_NAME(decrypt_mode)); 636 if (encrypt_debug_mode) 637 printf(">>>%s: Start to decrypt input with type %s\r\n", 638 Name, ENCTYPE_NAME(decrypt_mode)); 639 } else { 640 printf("%s: Warning, Cannot decrypt type %s (%d)!!!\r\n", 641 Name, 642 ENCTYPE_NAME_OK(decrypt_mode) 643 ? ENCTYPE_NAME(decrypt_mode) 644 : "(unknown)", 645 decrypt_mode); 646 encrypt_send_request_end(); 647 } 648} 649 650void 651encrypt_session_key( Session_Key *key, int server) 652{ 653 Encryptions *ep = encryptions; 654 655 havesessionkey = 1; 656 657 while (ep->type) { 658 if (ep->session) 659 (*ep->session)(key, server); 660 ++ep; 661 } 662} 663 664/* 665 * Called when ENCRYPT END is received. 666 */ 667void 668encrypt_end(void) 669{ 670 decrypt_input = 0; 671 if (encrypt_debug_mode) 672 printf(">>>%s: Input is back to clear text\r\n", Name); 673 if (encrypt_verbose) 674 printf("[ Input is now clear text ]\r\n"); 675} 676 677/* 678 * Called when ENCRYPT REQUEST-END is received. 679 */ 680void 681encrypt_request_end(void) 682{ 683 encrypt_send_end(); 684} 685 686/* 687 * Called when ENCRYPT REQUEST-START is received. If we receive 688 * this before a type is picked, then that indicates that the 689 * other side wants us to start encrypting data as soon as we 690 * can. 691 */ 692void 693encrypt_request_start(unsigned char *data __unused, int cnt __unused) 694{ 695 if (encrypt_mode == 0) { 696 if (Server) 697 autoencrypt = 1; 698 return; 699 } 700 encrypt_start_output(encrypt_mode); 701} 702 703static unsigned char str_keyid[(MAXKEYLEN*2)+5] = { IAC, SB, TELOPT_ENCRYPT }; 704 705void 706encrypt_enc_keyid(unsigned char *keyid, int len) 707{ 708 encrypt_keyid(&ki[1], keyid, len); 709} 710 711void 712encrypt_dec_keyid(unsigned char *keyid, int len) 713{ 714 encrypt_keyid(&ki[0], keyid, len); 715} 716 717void 718encrypt_keyid(struct key_info *kp, unsigned char *keyid, int len) 719{ 720 Encryptions *ep; 721 int dir = kp->dir; 722 int ret = 0; 723 724 if (len > MAXKEYLEN) 725 len = MAXKEYLEN; 726 727 if (!(ep = (*kp->getcrypt)(*kp->modep))) { 728 if (len == 0) 729 return; 730 kp->keylen = 0; 731 } else if (len == 0) { 732 /* 733 * Empty option, indicates a failure. 734 */ 735 if (kp->keylen == 0) 736 return; 737 kp->keylen = 0; 738 if (ep->keyid) 739 (void)(*ep->keyid)(dir, kp->keyid, &kp->keylen); 740 741 } else if ((len != kp->keylen) || 742 (memcmp(keyid, kp->keyid, len) != 0)) { 743 /* 744 * Length or contents are different 745 */ 746 kp->keylen = len; 747 memmove(kp->keyid, keyid, len); 748 if (ep->keyid) 749 (void)(*ep->keyid)(dir, kp->keyid, &kp->keylen); 750 } else { 751 if (ep->keyid) 752 ret = (*ep->keyid)(dir, kp->keyid, &kp->keylen); 753 if ((ret == 0) && (dir == DIR_ENCRYPT) && autoencrypt) 754 encrypt_start_output(*kp->modep); 755 return; 756 } 757 758 encrypt_send_keyid(dir, kp->keyid, kp->keylen, 0); 759} 760 761void 762encrypt_send_keyid(int dir, const char *keyid, int keylen, int saveit) 763{ 764 unsigned char *strp; 765 766 str_keyid[3] = (dir == DIR_ENCRYPT) 767 ? ENCRYPT_ENC_KEYID : ENCRYPT_DEC_KEYID; 768 if (saveit) { 769 struct key_info *kp = &ki[(dir == DIR_ENCRYPT) ? 0 : 1]; 770 memmove(kp->keyid, keyid, keylen); 771 kp->keylen = keylen; 772 } 773 774 for (strp = &str_keyid[4]; keylen > 0; --keylen) { 775 if ((*strp++ = *keyid++) == IAC) 776 *strp++ = IAC; 777 } 778 *strp++ = IAC; 779 *strp++ = SE; 780 net_write(str_keyid, strp - str_keyid); 781 printsub('>', &str_keyid[2], strp - str_keyid - 2); 782} 783 784void 785encrypt_auto(int on) 786{ 787 if (on < 0) 788 autoencrypt ^= 1; 789 else 790 autoencrypt = on ? 1 : 0; 791} 792 793void 794decrypt_auto(int on) 795{ 796 if (on < 0) 797 autodecrypt ^= 1; 798 else 799 autodecrypt = on ? 1 : 0; 800} 801 802void 803encrypt_start_output(int type) 804{ 805 Encryptions *ep; 806 unsigned char *p; 807 int i; 808 809 if (!(ep = findencryption(type))) { 810 if (encrypt_debug_mode) { 811 printf(">>>%s: Can't encrypt with type %s (%d)\r\n", 812 Name, 813 ENCTYPE_NAME_OK(type) 814 ? ENCTYPE_NAME(type) : "(unknown)", 815 type); 816 } 817 return; 818 } 819 if (ep->start) { 820 i = (*ep->start)(DIR_ENCRYPT, Server); 821 if (encrypt_debug_mode) { 822 printf(">>>%s: Encrypt start: %s (%d) %s\r\n", 823 Name, 824 (i < 0) ? "failed" : 825 "initial negotiation in progress", 826 i, ENCTYPE_NAME(type)); 827 } 828 if (i) 829 return; 830 } 831 p = str_start + 3; 832 *p++ = ENCRYPT_START; 833 for (i = 0; i < ki[0].keylen; ++i) { 834 if ((*p++ = ki[0].keyid[i]) == IAC) 835 *p++ = IAC; 836 } 837 *p++ = IAC; 838 *p++ = SE; 839 net_write(str_start, p - str_start); 840 net_encrypt(); 841 printsub('>', &str_start[2], p - &str_start[2]); 842 /* 843 * If we are already encrypting in some mode, then 844 * encrypt the ring (which includes our request) in 845 * the old mode, mark it all as "clear text" and then 846 * switch to the new mode. 847 */ 848 encrypt_output = ep->output; 849 encrypt_mode = type; 850 if (encrypt_debug_mode) 851 printf(">>>%s: Started to encrypt output with type %s\r\n", 852 Name, ENCTYPE_NAME(type)); 853 if (encrypt_verbose) 854 printf("[ Output is now encrypted with type %s ]\r\n", 855 ENCTYPE_NAME(type)); 856} 857 858void 859encrypt_send_end(void) 860{ 861 if (!encrypt_output) 862 return; 863 864 str_end[3] = ENCRYPT_END; 865 net_write(str_end, sizeof(str_end)); 866 net_encrypt(); 867 printsub('>', &str_end[2], sizeof(str_end) - 2); 868 /* 869 * Encrypt the output buffer now because it will not be done by 870 * netflush... 871 */ 872 encrypt_output = 0; 873 if (encrypt_debug_mode) 874 printf(">>>%s: Output is back to clear text\r\n", Name); 875 if (encrypt_verbose) 876 printf("[ Output is now clear text ]\r\n"); 877} 878 879void 880encrypt_send_request_start(void) 881{ 882 unsigned char *p; 883 int i; 884 885 p = &str_start[3]; 886 *p++ = ENCRYPT_REQSTART; 887 for (i = 0; i < ki[1].keylen; ++i) { 888 if ((*p++ = ki[1].keyid[i]) == IAC) 889 *p++ = IAC; 890 } 891 *p++ = IAC; 892 *p++ = SE; 893 net_write(str_start, p - str_start); 894 printsub('>', &str_start[2], p - &str_start[2]); 895 if (encrypt_debug_mode) 896 printf(">>>%s: Request input to be encrypted\r\n", Name); 897} 898 899void 900encrypt_send_request_end(void) 901{ 902 str_end[3] = ENCRYPT_REQEND; 903 net_write(str_end, sizeof(str_end)); 904 printsub('>', &str_end[2], sizeof(str_end) - 2); 905 906 if (encrypt_debug_mode) 907 printf(">>>%s: Request input to be clear text\r\n", Name); 908} 909 910void 911encrypt_wait(void) 912{ 913 if (encrypt_debug_mode) 914 printf(">>>%s: in encrypt_wait\r\n", Name); 915 if (!havesessionkey || !(I_SUPPORT_ENCRYPT & remote_supports_decrypt)) 916 return; 917 while (autoencrypt && !encrypt_output) 918 if (telnet_spin()) 919 return; 920} 921 922void 923encrypt_gen_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen) 924{ 925 char tbuf[16], *cp; 926 927 cnt -= 2; 928 data += 2; 929 buf[buflen-1] = '\0'; 930 buf[buflen-2] = '*'; 931 buflen -= 2;; 932 for (; cnt > 0; cnt--, data++) { 933 sprintf(tbuf, " %d", *data); 934 for (cp = tbuf; *cp && buflen > 0; --buflen) 935 *buf++ = *cp++; 936 if (buflen <= 0) 937 return; 938 } 939 *buf = '\0'; 940} 941 942void 943encrypt_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen) 944{ 945 Encryptions *ep; 946 int type = data[1]; 947 948 for (ep = encryptions; ep->type && ep->type != type; ep++) 949 ; 950 951 if (ep->printsub) 952 (*ep->printsub)(data, cnt, buf, buflen); 953 else 954 encrypt_gen_printsub(data, cnt, buf, buflen); 955} 956#endif /* ENCRYPTION */ 957