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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 32 __FBSDID("$FreeBSD$"); 33 34 #ifndef lint 35 #if 0 36 static const char sccsid[] = "@(#)encrypt.c 8.2 (Berkeley) 5/30/95"; 37 #endif 38 #endif /* not lint */ 39 40 /* 41 * Copyright (C) 1990 by the Massachusetts Institute of Technology 42 * 43 * Export of this software from the United States of America is assumed 44 * to require a specific license from the United States Government. 45 * It is the responsibility of any person or organization contemplating 46 * export to obtain such a license before exporting. 47 * 48 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 49 * distribute this software and its documentation for any purpose and 50 * without fee is hereby granted, provided that the above copyright 51 * notice appear in all copies and that both that copyright notice and 52 * this permission notice appear in supporting documentation, and that 53 * the name of M.I.T. not be used in advertising or publicity pertaining 54 * to distribution of the software without specific, written prior 55 * permission. M.I.T. makes no representations about the suitability of 56 * this software for any purpose. It is provided "as is" without express 57 * or implied warranty. 58 */ 59 60 #ifdef ENCRYPTION 61 62 #include <sys/types.h> 63 #define ENCRYPT_NAMES 64 #include <arpa/telnet.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 69 #include "encrypt.h" 70 #include "misc.h" 71 72 /* 73 * These functions pointers point to the current routines 74 * for encrypting and decrypting data. 75 */ 76 void (*encrypt_output)(unsigned char *, int); 77 int (*decrypt_input)(int); 78 79 int EncryptType(char *type, char *mode); 80 int EncryptStart(char *mode); 81 int EncryptStop(char *mode); 82 int EncryptStartInput(void); 83 int EncryptStartOutput(void); 84 int EncryptStopInput(void); 85 int EncryptStopOutput(void); 86 87 int encrypt_debug_mode = 0; 88 static int decrypt_mode = 0; 89 static int encrypt_mode = 0; 90 static int encrypt_verbose = 0; 91 static int autoencrypt = 0; 92 static int autodecrypt = 0; 93 static int havesessionkey = 0; 94 static int Server = 0; 95 static const char *Name = "Noname"; 96 97 #define typemask(x) ((x) > 0 ? 1 << ((x)-1) : 0) 98 99 static u_long i_support_encrypt = 0 100 | typemask(ENCTYPE_DES_CFB64) | typemask(ENCTYPE_DES_OFB64) 101 |0; 102 static u_long i_support_decrypt = 0 103 | typemask(ENCTYPE_DES_CFB64) | typemask(ENCTYPE_DES_OFB64) 104 |0; 105 106 static u_long i_wont_support_encrypt = 0; 107 static u_long i_wont_support_decrypt = 0; 108 #define I_SUPPORT_ENCRYPT (i_support_encrypt & ~i_wont_support_encrypt) 109 #define I_SUPPORT_DECRYPT (i_support_decrypt & ~i_wont_support_decrypt) 110 111 static u_long remote_supports_encrypt = 0; 112 static u_long remote_supports_decrypt = 0; 113 114 static Encryptions encryptions[] = { 115 { "DES_CFB64", ENCTYPE_DES_CFB64, 116 cfb64_encrypt, 117 cfb64_decrypt, 118 cfb64_init, 119 cfb64_start, 120 cfb64_is, 121 cfb64_reply, 122 cfb64_session, 123 cfb64_keyid, 124 cfb64_printsub }, 125 { "DES_OFB64", ENCTYPE_DES_OFB64, 126 ofb64_encrypt, 127 ofb64_decrypt, 128 ofb64_init, 129 ofb64_start, 130 ofb64_is, 131 ofb64_reply, 132 ofb64_session, 133 ofb64_keyid, 134 ofb64_printsub }, 135 { NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 136 }; 137 138 static unsigned char str_send[64] = { IAC, SB, TELOPT_ENCRYPT, 139 ENCRYPT_SUPPORT }; 140 static unsigned char str_suplen = 0; 141 static unsigned char str_start[72] = { IAC, SB, TELOPT_ENCRYPT }; 142 static unsigned char str_end[] = { IAC, SB, TELOPT_ENCRYPT, 0, IAC, SE }; 143 144 Encryptions * 145 findencryption(int type) 146 { 147 Encryptions *ep = encryptions; 148 149 if (!(I_SUPPORT_ENCRYPT & remote_supports_decrypt & (unsigned)typemask(type))) 150 return(0); 151 while (ep->type && ep->type != type) 152 ++ep; 153 return(ep->type ? ep : 0); 154 } 155 156 static Encryptions * 157 finddecryption(int type) 158 { 159 Encryptions *ep = encryptions; 160 161 if (!(I_SUPPORT_DECRYPT & remote_supports_encrypt & (unsigned)typemask(type))) 162 return(0); 163 while (ep->type && ep->type != type) 164 ++ep; 165 return(ep->type ? ep : 0); 166 } 167 168 #define MAXKEYLEN 64 169 170 static struct key_info { 171 unsigned char keyid[MAXKEYLEN]; 172 int keylen; 173 int dir; 174 int *modep; 175 Encryptions *(*getcrypt)(int); 176 } ki[2] = { 177 { { 0 }, 0, DIR_ENCRYPT, &encrypt_mode, findencryption }, 178 { { 0 }, 0, DIR_DECRYPT, &decrypt_mode, finddecryption }, 179 }; 180 181 static void encrypt_keyid(struct key_info *kp, unsigned char *keyid, int len); 182 183 void 184 encrypt_init(const char *name, int server) 185 { 186 Encryptions *ep = encryptions; 187 188 Name = name; 189 Server = server; 190 i_support_encrypt = i_support_decrypt = 0; 191 remote_supports_encrypt = remote_supports_decrypt = 0; 192 encrypt_mode = 0; 193 decrypt_mode = 0; 194 encrypt_output = 0; 195 decrypt_input = 0; 196 197 str_suplen = 4; 198 199 while (ep->type) { 200 if (encrypt_debug_mode) 201 printf(">>>%s: I will support %s\r\n", 202 Name, ENCTYPE_NAME(ep->type)); 203 i_support_encrypt |= typemask(ep->type); 204 i_support_decrypt |= typemask(ep->type); 205 if ((i_wont_support_decrypt & typemask(ep->type)) == 0) 206 if ((str_send[str_suplen++] = ep->type) == IAC) 207 str_send[str_suplen++] = IAC; 208 if (ep->init) 209 (*ep->init)(Server); 210 ++ep; 211 } 212 str_send[str_suplen++] = IAC; 213 str_send[str_suplen++] = SE; 214 } 215 216 static void 217 encrypt_list_types(void) 218 { 219 Encryptions *ep = encryptions; 220 221 printf("Valid encryption types:\n"); 222 while (ep->type) { 223 printf("\t%s (%d)\r\n", ENCTYPE_NAME(ep->type), ep->type); 224 ++ep; 225 } 226 } 227 228 int 229 EncryptEnable(char *type, char *mode) 230 { 231 if (isprefix(type, "help") || isprefix(type, "?")) { 232 printf("Usage: encrypt enable <type> [input|output]\n"); 233 encrypt_list_types(); 234 return(0); 235 } 236 if (EncryptType(type, mode)) 237 return(EncryptStart(mode)); 238 return(0); 239 } 240 241 int 242 EncryptDisable(char *type, char *mode) 243 { 244 Encryptions *ep; 245 int ret = 0; 246 247 if (isprefix(type, "help") || isprefix(type, "?")) { 248 printf("Usage: encrypt disable <type> [input|output]\n"); 249 encrypt_list_types(); 250 } else if ((ep = (Encryptions *)genget(type, (char **)encryptions, 251 sizeof(Encryptions))) == 0) { 252 printf("%s: invalid encryption type\n", type); 253 } else if (Ambiguous((char **)ep)) { 254 printf("Ambiguous type '%s'\n", type); 255 } else { 256 if ((mode == 0) || (isprefix(mode, "input") ? 1 : 0)) { 257 if (decrypt_mode == ep->type) 258 EncryptStopInput(); 259 i_wont_support_decrypt |= typemask(ep->type); 260 ret = 1; 261 } 262 if ((mode == 0) || (isprefix(mode, "output"))) { 263 if (encrypt_mode == ep->type) 264 EncryptStopOutput(); 265 i_wont_support_encrypt |= typemask(ep->type); 266 ret = 1; 267 } 268 if (ret == 0) 269 printf("%s: invalid encryption mode\n", mode); 270 } 271 return(ret); 272 } 273 274 int 275 EncryptType(char *type, char *mode) 276 { 277 Encryptions *ep; 278 int ret = 0; 279 280 if (isprefix(type, "help") || isprefix(type, "?")) { 281 printf("Usage: encrypt type <type> [input|output]\n"); 282 encrypt_list_types(); 283 } else if ((ep = (Encryptions *)genget(type, (char **)encryptions, 284 sizeof(Encryptions))) == 0) { 285 printf("%s: invalid encryption type\n", type); 286 } else if (Ambiguous((char **)ep)) { 287 printf("Ambiguous type '%s'\n", type); 288 } else { 289 if ((mode == 0) || isprefix(mode, "input")) { 290 decrypt_mode = ep->type; 291 i_wont_support_decrypt &= ~typemask(ep->type); 292 ret = 1; 293 } 294 if ((mode == 0) || isprefix(mode, "output")) { 295 encrypt_mode = ep->type; 296 i_wont_support_encrypt &= ~typemask(ep->type); 297 ret = 1; 298 } 299 if (ret == 0) 300 printf("%s: invalid encryption mode\n", mode); 301 } 302 return(ret); 303 } 304 305 int 306 EncryptStart(char *mode) 307 { 308 int ret = 0; 309 if (mode) { 310 if (isprefix(mode, "input")) 311 return(EncryptStartInput()); 312 if (isprefix(mode, "output")) 313 return(EncryptStartOutput()); 314 if (isprefix(mode, "help") || isprefix(mode, "?")) { 315 printf("Usage: encrypt start [input|output]\n"); 316 return(0); 317 } 318 printf("%s: invalid encryption mode 'encrypt start ?' for help\n", mode); 319 return(0); 320 } 321 ret += EncryptStartInput(); 322 ret += EncryptStartOutput(); 323 return(ret); 324 } 325 326 int 327 EncryptStartInput(void) 328 { 329 if (decrypt_mode) { 330 encrypt_send_request_start(); 331 return(1); 332 } 333 printf("No previous decryption mode, decryption not enabled\r\n"); 334 return(0); 335 } 336 337 int 338 EncryptStartOutput(void) 339 { 340 if (encrypt_mode) { 341 encrypt_start_output(encrypt_mode); 342 return(1); 343 } 344 printf("No previous encryption mode, encryption not enabled\r\n"); 345 return(0); 346 } 347 348 int 349 EncryptStop(char *mode) 350 { 351 int ret = 0; 352 if (mode) { 353 if (isprefix(mode, "input")) 354 return(EncryptStopInput()); 355 if (isprefix(mode, "output")) 356 return(EncryptStopOutput()); 357 if (isprefix(mode, "help") || isprefix(mode, "?")) { 358 printf("Usage: encrypt stop [input|output]\n"); 359 return(0); 360 } 361 printf("%s: invalid encryption mode 'encrypt stop ?' for help\n", mode); 362 return(0); 363 } 364 ret += EncryptStopInput(); 365 ret += EncryptStopOutput(); 366 return(ret); 367 } 368 369 int 370 EncryptStopInput(void) 371 { 372 encrypt_send_request_end(); 373 return(1); 374 } 375 376 int 377 EncryptStopOutput(void) 378 { 379 encrypt_send_end(); 380 return(1); 381 } 382 383 void 384 encrypt_display(void) 385 { 386 if (encrypt_output) 387 printf("Currently encrypting output with %s\r\n", 388 ENCTYPE_NAME(encrypt_mode)); 389 if (decrypt_input) 390 printf("Currently decrypting input with %s\r\n", 391 ENCTYPE_NAME(decrypt_mode)); 392 } 393 394 int 395 EncryptStatus(void) 396 { 397 if (encrypt_output) 398 printf("Currently encrypting output with %s\r\n", 399 ENCTYPE_NAME(encrypt_mode)); 400 else if (encrypt_mode) { 401 printf("Currently output is clear text.\r\n"); 402 printf("Last encryption mode was %s\r\n", 403 ENCTYPE_NAME(encrypt_mode)); 404 } 405 if (decrypt_input) { 406 printf("Currently decrypting input with %s\r\n", 407 ENCTYPE_NAME(decrypt_mode)); 408 } else if (decrypt_mode) { 409 printf("Currently input is clear text.\r\n"); 410 printf("Last decryption mode was %s\r\n", 411 ENCTYPE_NAME(decrypt_mode)); 412 } 413 return 1; 414 } 415 416 void 417 encrypt_send_support(void) 418 { 419 if (str_suplen) { 420 /* 421 * If the user has requested that decryption start 422 * immediatly, then send a "REQUEST START" before 423 * we negotiate the type. 424 */ 425 if (!Server && autodecrypt) 426 encrypt_send_request_start(); 427 net_write(str_send, str_suplen); 428 printsub('>', &str_send[2], str_suplen - 2); 429 str_suplen = 0; 430 } 431 } 432 433 int 434 EncryptDebug(int on) 435 { 436 if (on < 0) 437 encrypt_debug_mode ^= 1; 438 else 439 encrypt_debug_mode = on; 440 printf("Encryption debugging %s\r\n", 441 encrypt_debug_mode ? "enabled" : "disabled"); 442 return(1); 443 } 444 445 int 446 EncryptVerbose(int on) 447 { 448 if (on < 0) 449 encrypt_verbose ^= 1; 450 else 451 encrypt_verbose = on; 452 printf("Encryption %s verbose\r\n", 453 encrypt_verbose ? "is" : "is not"); 454 return(1); 455 } 456 457 int 458 EncryptAutoEnc(int on) 459 { 460 encrypt_auto(on); 461 printf("Automatic encryption of output is %s\r\n", 462 autoencrypt ? "enabled" : "disabled"); 463 return(1); 464 } 465 466 int 467 EncryptAutoDec(int on) 468 { 469 decrypt_auto(on); 470 printf("Automatic decryption of input is %s\r\n", 471 autodecrypt ? "enabled" : "disabled"); 472 return(1); 473 } 474 475 /* 476 * Called when ENCRYPT SUPPORT is received. 477 */ 478 void 479 encrypt_support(unsigned char *typelist, int cnt) 480 { 481 int type, use_type = 0; 482 Encryptions *ep; 483 484 /* 485 * Forget anything the other side has previously told us. 486 */ 487 remote_supports_decrypt = 0; 488 489 while (cnt-- > 0) { 490 type = *typelist++; 491 if (encrypt_debug_mode) 492 printf(">>>%s: He is supporting %s (%d)\r\n", 493 Name, 494 ENCTYPE_NAME(type), type); 495 if ((type < ENCTYPE_CNT) && 496 (I_SUPPORT_ENCRYPT & typemask(type))) { 497 remote_supports_decrypt |= typemask(type); 498 if (use_type == 0) 499 use_type = type; 500 } 501 } 502 if (use_type) { 503 ep = findencryption(use_type); 504 if (!ep) 505 return; 506 type = ep->start ? (*ep->start)(DIR_ENCRYPT, Server) : 0; 507 if (encrypt_debug_mode) 508 printf(">>>%s: (*ep->start)() returned %d\r\n", 509 Name, type); 510 if (type < 0) 511 return; 512 encrypt_mode = use_type; 513 if (type == 0) 514 encrypt_start_output(use_type); 515 } 516 } 517 518 void 519 encrypt_is(unsigned char *data, int cnt) 520 { 521 Encryptions *ep; 522 int type, ret; 523 524 if (--cnt < 0) 525 return; 526 type = *data++; 527 if (type < ENCTYPE_CNT) 528 remote_supports_encrypt |= typemask(type); 529 if (!(ep = finddecryption(type))) { 530 if (encrypt_debug_mode) 531 printf(">>>%s: Can't find type %s (%d) for initial negotiation\r\n", 532 Name, 533 ENCTYPE_NAME_OK(type) 534 ? ENCTYPE_NAME(type) : "(unknown)", 535 type); 536 return; 537 } 538 if (!ep->is) { 539 if (encrypt_debug_mode) 540 printf(">>>%s: No initial negotiation needed for type %s (%d)\r\n", 541 Name, 542 ENCTYPE_NAME_OK(type) 543 ? ENCTYPE_NAME(type) : "(unknown)", 544 type); 545 ret = 0; 546 } else { 547 ret = (*ep->is)(data, cnt); 548 if (encrypt_debug_mode) 549 printf("(*ep->is)(%p, %d) returned %s(%d)\n", data, cnt, 550 (ret < 0) ? "FAIL " : 551 (ret == 0) ? "SUCCESS " : "MORE_TO_DO ", ret); 552 } 553 if (ret < 0) { 554 autodecrypt = 0; 555 } else { 556 decrypt_mode = type; 557 if (ret == 0 && autodecrypt) 558 encrypt_send_request_start(); 559 } 560 } 561 562 void 563 encrypt_reply(unsigned char *data, int cnt) 564 { 565 Encryptions *ep; 566 int ret, type; 567 568 if (--cnt < 0) 569 return; 570 type = *data++; 571 if (!(ep = findencryption(type))) { 572 if (encrypt_debug_mode) 573 printf(">>>%s: Can't find type %s (%d) for initial negotiation\r\n", 574 Name, 575 ENCTYPE_NAME_OK(type) 576 ? ENCTYPE_NAME(type) : "(unknown)", 577 type); 578 return; 579 } 580 if (!ep->reply) { 581 if (encrypt_debug_mode) 582 printf(">>>%s: No initial negotiation needed for type %s (%d)\r\n", 583 Name, 584 ENCTYPE_NAME_OK(type) 585 ? ENCTYPE_NAME(type) : "(unknown)", 586 type); 587 ret = 0; 588 } else { 589 ret = (*ep->reply)(data, cnt); 590 if (encrypt_debug_mode) 591 printf("(*ep->reply)(%p, %d) returned %s(%d)\n", 592 data, cnt, 593 (ret < 0) ? "FAIL " : 594 (ret == 0) ? "SUCCESS " : "MORE_TO_DO ", ret); 595 } 596 if (encrypt_debug_mode) 597 printf(">>>%s: encrypt_reply returned %d\n", Name, ret); 598 if (ret < 0) { 599 autoencrypt = 0; 600 } else { 601 encrypt_mode = type; 602 if (ret == 0 && autoencrypt) 603 encrypt_start_output(type); 604 } 605 } 606 607 /* 608 * Called when a ENCRYPT START command is received. 609 */ 610 void 611 encrypt_start(unsigned char *data __unused, int cnt __unused) 612 { 613 Encryptions *ep; 614 615 if (!decrypt_mode) { 616 /* 617 * Something is wrong. We should not get a START 618 * command without having already picked our 619 * decryption scheme. Send a REQUEST-END to 620 * attempt to clear the channel... 621 */ 622 printf("%s: Warning, Cannot decrypt input stream!!!\r\n", Name); 623 encrypt_send_request_end(); 624 return; 625 } 626 627 if ((ep = finddecryption(decrypt_mode))) { 628 decrypt_input = ep->input; 629 if (encrypt_verbose) 630 printf("[ Input is now decrypted with type %s ]\r\n", 631 ENCTYPE_NAME(decrypt_mode)); 632 if (encrypt_debug_mode) 633 printf(">>>%s: Start to decrypt input with type %s\r\n", 634 Name, ENCTYPE_NAME(decrypt_mode)); 635 } else { 636 printf("%s: Warning, Cannot decrypt type %s (%d)!!!\r\n", 637 Name, 638 ENCTYPE_NAME_OK(decrypt_mode) 639 ? ENCTYPE_NAME(decrypt_mode) 640 : "(unknown)", 641 decrypt_mode); 642 encrypt_send_request_end(); 643 } 644 } 645 646 void 647 encrypt_session_key( Session_Key *key, int server) 648 { 649 Encryptions *ep = encryptions; 650 651 havesessionkey = 1; 652 653 while (ep->type) { 654 if (ep->session) 655 (*ep->session)(key, server); 656 ++ep; 657 } 658 } 659 660 /* 661 * Called when ENCRYPT END is received. 662 */ 663 void 664 encrypt_end(void) 665 { 666 decrypt_input = 0; 667 if (encrypt_debug_mode) 668 printf(">>>%s: Input is back to clear text\r\n", Name); 669 if (encrypt_verbose) 670 printf("[ Input is now clear text ]\r\n"); 671 } 672 673 /* 674 * Called when ENCRYPT REQUEST-END is received. 675 */ 676 void 677 encrypt_request_end(void) 678 { 679 encrypt_send_end(); 680 } 681 682 /* 683 * Called when ENCRYPT REQUEST-START is received. If we receive 684 * this before a type is picked, then that indicates that the 685 * other side wants us to start encrypting data as soon as we 686 * can. 687 */ 688 void 689 encrypt_request_start(unsigned char *data __unused, int cnt __unused) 690 { 691 if (encrypt_mode == 0) { 692 if (Server) 693 autoencrypt = 1; 694 return; 695 } 696 encrypt_start_output(encrypt_mode); 697 } 698 699 static unsigned char str_keyid[(MAXKEYLEN*2)+5] = { IAC, SB, TELOPT_ENCRYPT }; 700 701 void 702 encrypt_enc_keyid(unsigned char *keyid, int len) 703 { 704 encrypt_keyid(&ki[1], keyid, len); 705 } 706 707 void 708 encrypt_dec_keyid(unsigned char *keyid, int len) 709 { 710 encrypt_keyid(&ki[0], keyid, len); 711 } 712 713 void 714 encrypt_keyid(struct key_info *kp, unsigned char *keyid, int len) 715 { 716 Encryptions *ep; 717 int dir = kp->dir; 718 int ret = 0; 719 720 if (len > MAXKEYLEN) 721 len = MAXKEYLEN; 722 723 if (!(ep = (*kp->getcrypt)(*kp->modep))) { 724 if (len == 0) 725 return; 726 kp->keylen = 0; 727 } else if (len == 0) { 728 /* 729 * Empty option, indicates a failure. 730 */ 731 if (kp->keylen == 0) 732 return; 733 kp->keylen = 0; 734 if (ep->keyid) 735 (void)(*ep->keyid)(dir, kp->keyid, &kp->keylen); 736 737 } else if ((len != kp->keylen) || 738 (memcmp(keyid, kp->keyid, len) != 0)) { 739 /* 740 * Length or contents are different 741 */ 742 kp->keylen = len; 743 memmove(kp->keyid, keyid, len); 744 if (ep->keyid) 745 (void)(*ep->keyid)(dir, kp->keyid, &kp->keylen); 746 } else { 747 if (ep->keyid) 748 ret = (*ep->keyid)(dir, kp->keyid, &kp->keylen); 749 if ((ret == 0) && (dir == DIR_ENCRYPT) && autoencrypt) 750 encrypt_start_output(*kp->modep); 751 return; 752 } 753 754 encrypt_send_keyid(dir, kp->keyid, kp->keylen, 0); 755 } 756 757 void 758 encrypt_send_keyid(int dir, const char *keyid, int keylen, int saveit) 759 { 760 unsigned char *strp; 761 762 str_keyid[3] = (dir == DIR_ENCRYPT) 763 ? ENCRYPT_ENC_KEYID : ENCRYPT_DEC_KEYID; 764 if (saveit) { 765 struct key_info *kp = &ki[(dir == DIR_ENCRYPT) ? 0 : 1]; 766 memmove(kp->keyid, keyid, keylen); 767 kp->keylen = keylen; 768 } 769 770 for (strp = &str_keyid[4]; keylen > 0; --keylen) { 771 if ((*strp++ = *keyid++) == IAC) 772 *strp++ = IAC; 773 } 774 *strp++ = IAC; 775 *strp++ = SE; 776 net_write(str_keyid, strp - str_keyid); 777 printsub('>', &str_keyid[2], strp - str_keyid - 2); 778 } 779 780 void 781 encrypt_auto(int on) 782 { 783 if (on < 0) 784 autoencrypt ^= 1; 785 else 786 autoencrypt = on ? 1 : 0; 787 } 788 789 void 790 decrypt_auto(int on) 791 { 792 if (on < 0) 793 autodecrypt ^= 1; 794 else 795 autodecrypt = on ? 1 : 0; 796 } 797 798 void 799 encrypt_start_output(int type) 800 { 801 Encryptions *ep; 802 unsigned char *p; 803 int i; 804 805 if (!(ep = findencryption(type))) { 806 if (encrypt_debug_mode) { 807 printf(">>>%s: Can't encrypt with type %s (%d)\r\n", 808 Name, 809 ENCTYPE_NAME_OK(type) 810 ? ENCTYPE_NAME(type) : "(unknown)", 811 type); 812 } 813 return; 814 } 815 if (ep->start) { 816 i = (*ep->start)(DIR_ENCRYPT, Server); 817 if (encrypt_debug_mode) { 818 printf(">>>%s: Encrypt start: %s (%d) %s\r\n", 819 Name, 820 (i < 0) ? "failed" : 821 "initial negotiation in progress", 822 i, ENCTYPE_NAME(type)); 823 } 824 if (i) 825 return; 826 } 827 p = str_start + 3; 828 *p++ = ENCRYPT_START; 829 for (i = 0; i < ki[0].keylen; ++i) { 830 if ((*p++ = ki[0].keyid[i]) == IAC) 831 *p++ = IAC; 832 } 833 *p++ = IAC; 834 *p++ = SE; 835 net_write(str_start, p - str_start); 836 net_encrypt(); 837 printsub('>', &str_start[2], p - &str_start[2]); 838 /* 839 * If we are already encrypting in some mode, then 840 * encrypt the ring (which includes our request) in 841 * the old mode, mark it all as "clear text" and then 842 * switch to the new mode. 843 */ 844 encrypt_output = ep->output; 845 encrypt_mode = type; 846 if (encrypt_debug_mode) 847 printf(">>>%s: Started to encrypt output with type %s\r\n", 848 Name, ENCTYPE_NAME(type)); 849 if (encrypt_verbose) 850 printf("[ Output is now encrypted with type %s ]\r\n", 851 ENCTYPE_NAME(type)); 852 } 853 854 void 855 encrypt_send_end(void) 856 { 857 if (!encrypt_output) 858 return; 859 860 str_end[3] = ENCRYPT_END; 861 net_write(str_end, sizeof(str_end)); 862 net_encrypt(); 863 printsub('>', &str_end[2], sizeof(str_end) - 2); 864 /* 865 * Encrypt the output buffer now because it will not be done by 866 * netflush... 867 */ 868 encrypt_output = 0; 869 if (encrypt_debug_mode) 870 printf(">>>%s: Output is back to clear text\r\n", Name); 871 if (encrypt_verbose) 872 printf("[ Output is now clear text ]\r\n"); 873 } 874 875 void 876 encrypt_send_request_start(void) 877 { 878 unsigned char *p; 879 int i; 880 881 p = &str_start[3]; 882 *p++ = ENCRYPT_REQSTART; 883 for (i = 0; i < ki[1].keylen; ++i) { 884 if ((*p++ = ki[1].keyid[i]) == IAC) 885 *p++ = IAC; 886 } 887 *p++ = IAC; 888 *p++ = SE; 889 net_write(str_start, p - str_start); 890 printsub('>', &str_start[2], p - &str_start[2]); 891 if (encrypt_debug_mode) 892 printf(">>>%s: Request input to be encrypted\r\n", Name); 893 } 894 895 void 896 encrypt_send_request_end(void) 897 { 898 str_end[3] = ENCRYPT_REQEND; 899 net_write(str_end, sizeof(str_end)); 900 printsub('>', &str_end[2], sizeof(str_end) - 2); 901 902 if (encrypt_debug_mode) 903 printf(">>>%s: Request input to be clear text\r\n", Name); 904 } 905 906 void 907 encrypt_wait(void) 908 { 909 if (encrypt_debug_mode) 910 printf(">>>%s: in encrypt_wait\r\n", Name); 911 if (!havesessionkey || !(I_SUPPORT_ENCRYPT & remote_supports_decrypt)) 912 return; 913 while (autoencrypt && !encrypt_output) 914 if (telnet_spin()) 915 return; 916 } 917 918 void 919 encrypt_gen_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen) 920 { 921 char tbuf[16], *cp; 922 923 cnt -= 2; 924 data += 2; 925 buf[buflen-1] = '\0'; 926 buf[buflen-2] = '*'; 927 buflen -= 2;; 928 for (; cnt > 0; cnt--, data++) { 929 sprintf(tbuf, " %d", *data); 930 for (cp = tbuf; *cp && buflen > 0; --buflen) 931 *buf++ = *cp++; 932 if (buflen <= 0) 933 return; 934 } 935 *buf = '\0'; 936 } 937 938 void 939 encrypt_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen) 940 { 941 Encryptions *ep; 942 int type = data[1]; 943 944 for (ep = encryptions; ep->type && ep->type != type; ep++) 945 ; 946 947 if (ep->printsub) 948 (*ep->printsub)(data, cnt, buf, buflen); 949 else 950 encrypt_gen_printsub(data, cnt, buf, buflen); 951 } 952 #endif /* ENCRYPTION */ 953