| 1 | /*- |
| 2 | * Copyright (c) 1991 The Regents of the University of California. |
| 3 | * 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 | #ifndef lint |
| 35 | static char sccsid[] = "@(#)encrypt.c 5.2 (Berkeley) 3/22/91"; |
| 36 | #endif /* not lint */ |
| 37 | |
| 38 | /* |
| 39 | * Copyright (C) 1990 by the Massachusetts Institute of Technology |
| 40 | * |
| 41 | * Export of this software from the United States of America is assumed |
| 42 | * to require a specific license from the United States Government. |
| 43 | * It is the responsibility of any person or organization contemplating |
| 44 | * export to obtain such a license before exporting. |
| 45 | * |
| 46 | * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and |
| 47 | * distribute this software and its documentation for any purpose and |
| 48 | * without fee is hereby granted, provided that the above copyright |
| 49 | * notice appear in all copies and that both that copyright notice and |
| 50 | * this permission notice appear in supporting documentation, and that |
| 51 | * the name of M.I.T. not be used in advertising or publicity pertaining |
| 52 | * to distribution of the software without specific, written prior |
| 53 | * permission. M.I.T. makes no representations about the suitability of |
| 54 | * this software for any purpose. It is provided "as is" without express |
| 55 | * or implied warranty. |
| 56 | */ |
| 57 | |
| 58 | #if defined(ENCRYPT) |
| 59 | |
| 60 | #define ENCRYPT_NAMES |
| 61 | #include <arpa/telnet.h> |
| 62 | |
| 63 | #include "encrypt.h" |
| 64 | #include "misc.h" |
| 65 | |
| 66 | #ifdef __STDC__ |
| 67 | #include <stdlib.h> |
| 68 | #endif |
| 69 | #ifdef NO_STRING_H |
| 70 | #include <strings.h> |
| 71 | #else |
| 72 | #include <string.h> |
| 73 | #endif |
| 74 | |
| 75 | /* |
| 76 | * These functions pointers point to the current routines |
| 77 | * for encrypting and decrypting data. |
| 78 | */ |
| 79 | void (*encrypt_output) P((unsigned char *, int)); |
| 80 | int (*decrypt_input) P((int)); |
| 81 | |
| 82 | int encrypt_debug_mode = 0; |
| 83 | static int decrypt_mode = 0; |
| 84 | static int encrypt_mode = 0; |
| 85 | static int encrypt_verbose = 0; |
| 86 | static int autoencrypt = 0; |
| 87 | static int autodecrypt = 0; |
| 88 | static int havesessionkey = 0; |
| 89 | static int Server = 0; |
| 90 | static char *Name = "Noname"; |
| 91 | |
| 92 | #define typemask(x) ((x) > 0 ? 1 << ((x)-1) : 0) |
| 93 | |
| 94 | static long i_support_encrypt = typemask(ENCTYPE_DES_CFB64) |
| 95 | | typemask(ENCTYPE_DES_OFB64); |
| 96 | static long i_support_decrypt = typemask(ENCTYPE_DES_CFB64) |
| 97 | | typemask(ENCTYPE_DES_OFB64); |
| 98 | static long i_wont_support_encrypt = 0; |
| 99 | static long i_wont_support_decrypt = 0; |
| 100 | #define I_SUPPORT_ENCRYPT (i_support_encrypt & ~i_wont_support_encrypt) |
| 101 | #define I_SUPPORT_DECRYPT (i_support_decrypt & ~i_wont_support_decrypt) |
| 102 | |
| 103 | static long remote_supports_encrypt = 0; |
| 104 | static long remote_supports_decrypt = 0; |
| 105 | |
| 106 | static Encryptions encryptions[] = { |
| 107 | #if defined(DES_ENCRYPT) |
| 108 | { "DES_CFB64", ENCTYPE_DES_CFB64, |
| 109 | cfb64_encrypt, |
| 110 | cfb64_decrypt, |
| 111 | cfb64_init, |
| 112 | cfb64_start, |
| 113 | cfb64_is, |
| 114 | cfb64_reply, |
| 115 | cfb64_session, |
| 116 | cfb64_keyid, |
| 117 | cfb64_printsub }, |
| 118 | { "DES_OFB64", ENCTYPE_DES_OFB64, |
| 119 | ofb64_encrypt, |
| 120 | ofb64_decrypt, |
| 121 | ofb64_init, |
| 122 | ofb64_start, |
| 123 | ofb64_is, |
| 124 | ofb64_reply, |
| 125 | ofb64_session, |
| 126 | ofb64_keyid, |
| 127 | ofb64_printsub }, |
| 128 | #endif |
| 129 | { 0, }, |
| 130 | }; |
| 131 | |
| 132 | static unsigned char str_send[64] = { IAC, SB, TELOPT_ENCRYPT, |
| 133 | ENCRYPT_SUPPORT }; |
| 134 | static unsigned char str_suplen = 0; |
| 135 | static unsigned char str_start[72] = { IAC, SB, TELOPT_ENCRYPT }; |
| 136 | static unsigned char str_end[] = { IAC, SB, TELOPT_ENCRYPT, 0, IAC, SE }; |
| 137 | |
| 138 | Encryptions * |
| 139 | findencryption(type) |
| 140 | int type; |
| 141 | { |
| 142 | Encryptions *ep = encryptions; |
| 143 | |
| 144 | if (!(I_SUPPORT_ENCRYPT & remote_supports_decrypt & typemask(type))) |
| 145 | return(0); |
| 146 | while (ep->type && ep->type != type) |
| 147 | ++ep; |
| 148 | return(ep->type ? ep : 0); |
| 149 | } |
| 150 | |
| 151 | Encryptions * |
| 152 | finddecryption(type) |
| 153 | int type; |
| 154 | { |
| 155 | Encryptions *ep = encryptions; |
| 156 | |
| 157 | if (!(I_SUPPORT_DECRYPT & remote_supports_encrypt & typemask(type))) |
| 158 | return(0); |
| 159 | while (ep->type && ep->type != type) |
| 160 | ++ep; |
| 161 | return(ep->type ? ep : 0); |
| 162 | } |
| 163 | |
| 164 | #define MAXKEYLEN 64 |
| 165 | |
| 166 | static struct key_info { |
| 167 | unsigned char keyid[MAXKEYLEN]; |
| 168 | int keylen; |
| 169 | int dir; |
| 170 | int *modep; |
| 171 | Encryptions *(*getcrypt)(); |
| 172 | } ki[2] = { |
| 173 | { { 0 }, 0, DIR_ENCRYPT, &encrypt_mode, findencryption }, |
| 174 | { { 0 }, 0, DIR_DECRYPT, &decrypt_mode, finddecryption }, |
| 175 | }; |
| 176 | |
| 177 | void |
| 178 | encrypt_init(name, server) |
| 179 | char *name; |
| 180 | int server; |
| 181 | { |
| 182 | Encryptions *ep = encryptions; |
| 183 | |
| 184 | Name = name; |
| 185 | Server = server; |
| 186 | i_support_encrypt = i_support_decrypt = 0; |
| 187 | remote_supports_encrypt = remote_supports_decrypt = 0; |
| 188 | encrypt_mode = 0; |
| 189 | decrypt_mode = 0; |
| 190 | encrypt_output = 0; |
| 191 | decrypt_input = 0; |
| 192 | #ifdef notdef |
| 193 | encrypt_verbose = !server; |
| 194 | #endif |
| 195 | |
| 196 | str_suplen = 4; |
| 197 | |
| 198 | while (ep->type) { |
| 199 | if (encrypt_debug_mode) |
| 200 | printf(">>>%s: I will support %s\r\n", |
| 201 | Name, ENCTYPE_NAME(ep->type)); |
| 202 | i_support_encrypt |= typemask(ep->type); |
| 203 | i_support_decrypt |= typemask(ep->type); |
| 204 | if ((i_wont_support_decrypt & typemask(ep->type)) == 0) |
| 205 | if ((str_send[str_suplen++] = ep->type) == IAC) |
| 206 | str_send[str_suplen++] = IAC; |
| 207 | if (ep->init) |
| 208 | (*ep->init)(Server); |
| 209 | ++ep; |
| 210 | } |
| 211 | str_send[str_suplen++] = IAC; |
| 212 | str_send[str_suplen++] = SE; |
| 213 | } |
| 214 | |
| 215 | void |
| 216 | encrypt_list_types() |
| 217 | { |
| 218 | Encryptions *ep = encryptions; |
| 219 | |
| 220 | printf("Valid encryption types:\n"); |
| 221 | while (ep->type) { |
| 222 | printf("\t%s (%d)\r\n", ENCTYPE_NAME(ep->type), ep->type); |
| 223 | ++ep; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | int |
| 228 | EncryptEnable(type, mode) |
| 229 | char *type, *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(type, mode) |
| 243 | char *type, *mode; |
| 244 | { |
| 245 | register Encryptions *ep; |
| 246 | int ret = 0; |
| 247 | |
| 248 | if (isprefix(type, "help") || isprefix(type, "?")) { |
| 249 | printf("Usage: encrypt disable <type> [input|output]\n"); |
| 250 | encrypt_list_types(); |
| 251 | } else if ((ep = (Encryptions *)genget(type, encryptions, |
| 252 | sizeof(Encryptions))) == 0) { |
| 253 | printf("%s: invalid encryption type\n", type); |
| 254 | } else if (Ambiguous(ep)) { |
| 255 | printf("Ambiguous type '%s'\n", type); |
| 256 | } else { |
| 257 | if ((mode == 0) || (isprefix(mode, "input") ? 1 : 0)) { |
| 258 | if (decrypt_mode == ep->type) |
| 259 | EncryptStopInput(); |
| 260 | i_wont_support_decrypt |= typemask(ep->type); |
| 261 | ret = 1; |
| 262 | } |
| 263 | if ((mode == 0) || (isprefix(mode, "output"))) { |
| 264 | if (encrypt_mode == ep->type) |
| 265 | EncryptStopOutput(); |
| 266 | i_wont_support_encrypt |= typemask(ep->type); |
| 267 | ret = 1; |
| 268 | } |
| 269 | if (ret == 0) |
| 270 | printf("%s: invalid encryption mode\n", mode); |
| 271 | } |
| 272 | return(ret); |
| 273 | } |
| 274 | |
| 275 | int |
| 276 | EncryptType(type, mode) |
| 277 | char *type; |
| 278 | char *mode; |
| 279 | { |
| 280 | register Encryptions *ep; |
| 281 | int ret = 0; |
| 282 | |
| 283 | if (isprefix(type, "help") || isprefix(type, "?")) { |
| 284 | printf("Usage: encrypt type <type> [input|output]\n"); |
| 285 | encrypt_list_types(); |
| 286 | } else if ((ep = (Encryptions *)genget(type, encryptions, |
| 287 | sizeof(Encryptions))) == 0) { |
| 288 | printf("%s: invalid encryption type\n", type); |
| 289 | } else if (Ambiguous(ep)) { |
| 290 | printf("Ambiguous type '%s'\n", type); |
| 291 | } else { |
| 292 | if ((mode == 0) || isprefix(mode, "input")) { |
| 293 | decrypt_mode = ep->type; |
| 294 | i_wont_support_decrypt &= ~typemask(ep->type); |
| 295 | ret = 1; |
| 296 | } |
| 297 | if ((mode == 0) || isprefix(mode, "output")) { |
| 298 | encrypt_mode = ep->type; |
| 299 | i_wont_support_encrypt &= ~typemask(ep->type); |
| 300 | ret = 1; |
| 301 | } |
| 302 | if (ret == 0) |
| 303 | printf("%s: invalid encryption mode\n", mode); |
| 304 | } |
| 305 | return(ret); |
| 306 | } |
| 307 | |
| 308 | int |
| 309 | EncryptStart(mode) |
| 310 | char *mode; |
| 311 | { |
| 312 | register 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 | |
| 330 | int |
| 331 | EncryptStartInput() |
| 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 | |
| 341 | int |
| 342 | EncryptStartOutput() |
| 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 | |
| 352 | int |
| 353 | EncryptStop(mode) |
| 354 | char *mode; |
| 355 | { |
| 356 | int ret = 0; |
| 357 | if (mode) { |
| 358 | if (isprefix(mode, "input")) |
| 359 | return(EncryptStopInput()); |
| 360 | if (isprefix(mode, "output")) |
| 361 | return(EncryptStopOutput()); |
| 362 | if (isprefix(mode, "help") || isprefix(mode, "?")) { |
| 363 | printf("Usage: encrypt stop [input|output]\n"); |
| 364 | return(0); |
| 365 | } |
| 366 | printf("%s: invalid encryption mode 'encrypt stop ?' for help\n", mode); |
| 367 | return(0); |
| 368 | } |
| 369 | ret += EncryptStopInput(); |
| 370 | ret += EncryptStopOutput(); |
| 371 | return(ret); |
| 372 | } |
| 373 | |
| 374 | int |
| 375 | EncryptStopInput() |
| 376 | { |
| 377 | encrypt_send_request_end(); |
| 378 | return(1); |
| 379 | } |
| 380 | |
| 381 | int |
| 382 | EncryptStopOutput() |
| 383 | { |
| 384 | encrypt_send_end(); |
| 385 | return(1); |
| 386 | } |
| 387 | |
| 388 | void |
| 389 | encrypt_display() |
| 390 | { |
| 391 | if (encrypt_output) |
| 392 | printf("Currently encrypting output with %s\r\n", |
| 393 | ENCTYPE_NAME(encrypt_mode)); |
| 394 | if (decrypt_input) |
| 395 | printf("Currently decrypting input with %s\r\n", |
| 396 | ENCTYPE_NAME(decrypt_mode)); |
| 397 | } |
| 398 | |
| 399 | int |
| 400 | EncryptStatus() |
| 401 | { |
| 402 | if (encrypt_output) |
| 403 | printf("Currently encrypting output with %s\r\n", |
| 404 | ENCTYPE_NAME(encrypt_mode)); |
| 405 | else if (encrypt_mode) { |
| 406 | printf("Currently output is clear text.\r\n"); |
| 407 | printf("Last encryption mode was %s\r\n", |
| 408 | ENCTYPE_NAME(encrypt_mode)); |
| 409 | } |
| 410 | if (decrypt_input) { |
| 411 | printf("Currently decrypting input with %s\r\n", |
| 412 | ENCTYPE_NAME(decrypt_mode)); |
| 413 | } else if (decrypt_mode) { |
| 414 | printf("Currently input is clear text.\r\n"); |
| 415 | printf("Last decryption mode was %s\r\n", |
| 416 | ENCTYPE_NAME(decrypt_mode)); |
| 417 | } |
| 418 | return 1; |
| 419 | } |
| 420 | |
| 421 | void |
| 422 | encrypt_send_support() |
| 423 | { |
| 424 | if (str_suplen) { |
| 425 | /* |
| 426 | * If the user has requested that decryption start |
| 427 | * immediatly, then send a "REQUEST START" before |
| 428 | * we negotiate the type. |
| 429 | */ |
| 430 | if (!Server && autodecrypt) |
| 431 | encrypt_send_request_start(); |
| 432 | net_write(str_send, str_suplen); |
| 433 | printsub('>', &str_send[2], str_suplen - 2); |
| 434 | str_suplen = 0; |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | int |
| 439 | EncryptDebug(on) |
| 440 | int on; |
| 441 | { |
| 442 | if (on < 0) |
| 443 | encrypt_debug_mode ^= 1; |
| 444 | else |
| 445 | encrypt_debug_mode = on; |
| 446 | printf("Encryption debugging %s\r\n", |
| 447 | encrypt_debug_mode ? "enabled" : "disabled"); |
| 448 | return(1); |
| 449 | } |
| 450 | |
| 451 | int |
| 452 | EncryptVerbose(on) |
| 453 | int on; |
| 454 | { |
| 455 | if (on < 0) |
| 456 | encrypt_verbose ^= 1; |
| 457 | else |
| 458 | encrypt_verbose = on; |
| 459 | printf("Encryption %s verbose\r\n", |
| 460 | encrypt_verbose ? "is" : "is not"); |
| 461 | return(1); |
| 462 | } |
| 463 | |
| 464 | int |
| 465 | EncryptAutoEnc(on) |
| 466 | int on; |
| 467 | { |
| 468 | encrypt_auto(on); |
| 469 | printf("Automatic encryption of output is %s\r\n", |
| 470 | autoencrypt ? "enabled" : "disabled"); |
| 471 | return(1); |
| 472 | } |
| 473 | |
| 474 | int |
| 475 | EncryptAutoDec(on) |
| 476 | int on; |
| 477 | { |
| 478 | decrypt_auto(on); |
| 479 | printf("Automatic decryption of input is %s\r\n", |
| 480 | autodecrypt ? "enabled" : "disabled"); |
| 481 | return(1); |
| 482 | } |
| 483 | |
| 484 | /* |
| 485 | * Called when ENCRYPT SUPPORT is received. |
| 486 | */ |
| 487 | void |
| 488 | encrypt_support(typelist, cnt) |
| 489 | unsigned char *typelist; |
| 490 | int cnt; |
| 491 | { |
| 492 | register int type, use_type = 0; |
| 493 | Encryptions *ep; |
| 494 | |
| 495 | /* |
| 496 | * Forget anything the other side has previously told us. |
| 497 | */ |
| 498 | remote_supports_decrypt = 0; |
| 499 | |
| 500 | while (cnt-- > 0) { |
| 501 | type = *typelist++; |
| 502 | if (encrypt_debug_mode) |
| 503 | printf(">>>%s: He is supporting %s (%d)\r\n", |
| 504 | Name, |
| 505 | ENCTYPE_NAME(type), type); |
| 506 | if ((type < ENCTYPE_CNT) && |
| 507 | (I_SUPPORT_ENCRYPT & typemask(type))) { |
| 508 | remote_supports_decrypt |= typemask(type); |
| 509 | if (use_type == 0) |
| 510 | use_type = type; |
| 511 | } |
| 512 | } |
| 513 | if (use_type) { |
| 514 | ep = findencryption(use_type); |
| 515 | if (!ep) |
| 516 | return; |
| 517 | type = ep->start ? (*ep->start)(DIR_ENCRYPT, Server) : 0; |
| 518 | if (encrypt_debug_mode) |
| 519 | printf(">>>%s: (*ep->start)() returned %d\r\n", |
| 520 | Name, type); |
| 521 | if (type < 0) |
| 522 | return; |
| 523 | encrypt_mode = use_type; |
| 524 | if (type == 0) |
| 525 | encrypt_start_output(use_type); |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | void |
| 530 | encrypt_is(data, cnt) |
| 531 | unsigned char *data; |
| 532 | int cnt; |
| 533 | { |
| 534 | Encryptions *ep; |
| 535 | register int type, ret; |
| 536 | |
| 537 | if (--cnt < 0) |
| 538 | return; |
| 539 | type = *data++; |
| 540 | if (type < ENCTYPE_CNT) |
| 541 | remote_supports_encrypt |= typemask(type); |
| 542 | if (!(ep = finddecryption(type))) { |
| 543 | if (encrypt_debug_mode) |
| 544 | printf(">>>%s: Can't find type %s (%d) for initial negotiation\r\n", |
| 545 | Name, |
| 546 | ENCTYPE_NAME_OK(type) |
| 547 | ? ENCTYPE_NAME(type) : "(unknown)", |
| 548 | type); |
| 549 | return; |
| 550 | } |
| 551 | if (!ep->is) { |
| 552 | if (encrypt_debug_mode) |
| 553 | printf(">>>%s: No initial negotiation needed for type %s (%d)\r\n", |
| 554 | Name, |
| 555 | ENCTYPE_NAME_OK(type) |
| 556 | ? ENCTYPE_NAME(type) : "(unknown)", |
| 557 | type); |
| 558 | ret = 0; |
| 559 | } else { |
| 560 | ret = (*ep->is)(data, cnt); |
| 561 | if (encrypt_debug_mode) |
| 562 | printf("(*ep->is)(%x, %d) returned %s(%d)\n", data, cnt, |
| 563 | (ret < 0) ? "FAIL " : |
| 564 | (ret == 0) ? "SUCCESS " : "MORE_TO_DO ", ret); |
| 565 | } |
| 566 | if (ret < 0) { |
| 567 | autodecrypt = 0; |
| 568 | } else { |
| 569 | decrypt_mode = type; |
| 570 | if (ret == 0 && autodecrypt) |
| 571 | encrypt_send_request_start(); |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | void |
| 576 | encrypt_reply(data, cnt) |
| 577 | unsigned char *data; |
| 578 | int cnt; |
| 579 | { |
| 580 | Encryptions *ep; |
| 581 | register int ret, type; |
| 582 | |
| 583 | if (--cnt < 0) |
| 584 | return; |
| 585 | type = *data++; |
| 586 | if (!(ep = findencryption(type))) { |
| 587 | if (encrypt_debug_mode) |
| 588 | printf(">>>%s: Can't find type %s (%d) for initial negotiation\r\n", |
| 589 | Name, |
| 590 | ENCTYPE_NAME_OK(type) |
| 591 | ? ENCTYPE_NAME(type) : "(unknown)", |
| 592 | type); |
| 593 | return; |
| 594 | } |
| 595 | if (!ep->reply) { |
| 596 | if (encrypt_debug_mode) |
| 597 | printf(">>>%s: No initial negotiation needed for type %s (%d)\r\n", |
| 598 | Name, |
| 599 | ENCTYPE_NAME_OK(type) |
| 600 | ? ENCTYPE_NAME(type) : "(unknown)", |
| 601 | type); |
| 602 | ret = 0; |
| 603 | } else { |
| 604 | ret = (*ep->reply)(data, cnt); |
| 605 | if (encrypt_debug_mode) |
| 606 | printf("(*ep->reply)(%x, %d) returned %s(%d)\n", |
| 607 | data, cnt, |
| 608 | (ret < 0) ? "FAIL " : |
| 609 | (ret == 0) ? "SUCCESS " : "MORE_TO_DO ", ret); |
| 610 | } |
| 611 | if (encrypt_debug_mode) |
| 612 | printf(">>>%s: encrypt_reply returned %d\n", Name, ret); |
| 613 | if (ret < 0) { |
| 614 | autoencrypt = 0; |
| 615 | } else { |
| 616 | encrypt_mode = type; |
| 617 | if (ret == 0 && autoencrypt) |
| 618 | encrypt_start_output(type); |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * Called when a ENCRYPT START command is received. |
| 624 | */ |
| 625 | void |
| 626 | encrypt_start(data, cnt) |
| 627 | unsigned char *data; |
| 628 | int cnt; |
| 629 | { |
| 630 | Encryptions *ep; |
| 631 | |
| 632 | if (!decrypt_mode) { |
| 633 | /* |
| 634 | * Something is wrong. We should not get a START |
| 635 | * command without having already picked our |
| 636 | * decryption scheme. Send a REQUEST-END to |
| 637 | * attempt to clear the channel... |
| 638 | */ |
| 639 | printf("%s: Warning, Cannot decrypt input stream!!!\r\n", Name); |
| 640 | encrypt_send_request_end(); |
| 641 | return; |
| 642 | } |
| 643 | |
| 644 | if (ep = finddecryption(decrypt_mode)) { |
| 645 | decrypt_input = ep->input; |
| 646 | if (encrypt_verbose) |
| 647 | printf("[ Input is now decrypted with type %s ]\r\n", |
| 648 | ENCTYPE_NAME(decrypt_mode)); |
| 649 | if (encrypt_debug_mode) |
| 650 | printf(">>>%s: Start to decrypt input with type %s\r\n", |
| 651 | Name, ENCTYPE_NAME(decrypt_mode)); |
| 652 | } else { |
| 653 | printf("%s: Warning, Cannot decrypt type %s (%d)!!!\r\n", |
| 654 | Name, |
| 655 | ENCTYPE_NAME_OK(decrypt_mode) |
| 656 | ? ENCTYPE_NAME(decrypt_mode) |
| 657 | : "(unknown)", |
| 658 | decrypt_mode); |
| 659 | encrypt_send_request_end(); |
| 660 | } |
| 661 | } |
| 662 | |
| 663 | void |
| 664 | encrypt_session_key(key, server) |
| 665 | Session_Key *key; |
| 666 | int server; |
| 667 | { |
| 668 | Encryptions *ep = encryptions; |
| 669 | |
| 670 | havesessionkey = 1; |
| 671 | |
| 672 | while (ep->type) { |
| 673 | if (ep->session) |
| 674 | (*ep->session)(key, server); |
| 675 | ++ep; |
| 676 | } |
| 677 | } |
| 678 | |
| 679 | /* |
| 680 | * Called when ENCRYPT END is received. |
| 681 | */ |
| 682 | void |
| 683 | encrypt_end() |
| 684 | { |
| 685 | decrypt_input = 0; |
| 686 | if (encrypt_debug_mode) |
| 687 | printf(">>>%s: Input is back to clear text\r\n", Name); |
| 688 | if (encrypt_verbose) |
| 689 | printf("[ Input is now clear text ]\r\n"); |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | * Called when ENCRYPT REQUEST-END is received. |
| 694 | */ |
| 695 | void |
| 696 | encrypt_request_end() |
| 697 | { |
| 698 | encrypt_send_end(); |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | * Called when ENCRYPT REQUEST-START is received. If we receive |
| 703 | * this before a type is picked, then that indicates that the |
| 704 | * other side wants us to start encrypting data as soon as we |
| 705 | * can. |
| 706 | */ |
| 707 | void |
| 708 | encrypt_request_start(data, cnt) |
| 709 | unsigned char *data; |
| 710 | int cnt; |
| 711 | { |
| 712 | if (encrypt_mode == 0) { |
| 713 | if (Server) |
| 714 | autoencrypt = 1; |
| 715 | return; |
| 716 | } |
| 717 | encrypt_start_output(encrypt_mode); |
| 718 | } |
| 719 | |
| 720 | static unsigned char str_keyid[(MAXKEYLEN*2)+5] = { IAC, SB, TELOPT_ENCRYPT }; |
| 721 | |
| 722 | encrypt_enc_keyid(keyid, len) |
| 723 | unsigned char *keyid; |
| 724 | int len; |
| 725 | { |
| 726 | encrypt_keyid(&ki[1], keyid, len); |
| 727 | } |
| 728 | |
| 729 | encrypt_dec_keyid(keyid, len) |
| 730 | unsigned char *keyid; |
| 731 | int len; |
| 732 | { |
| 733 | encrypt_keyid(&ki[0], keyid, len); |
| 734 | } |
| 735 | |
| 736 | encrypt_keyid(kp, keyid, len) |
| 737 | struct key_info *kp; |
| 738 | unsigned char *keyid; |
| 739 | int len; |
| 740 | { |
| 741 | Encryptions *ep; |
| 742 | unsigned char *strp, *cp; |
| 743 | int dir = kp->dir; |
| 744 | register int ret = 0; |
| 745 | |
| 746 | if (!(ep = (*kp->getcrypt)(*kp->modep))) { |
| 747 | if (len == 0) |
| 748 | return; |
| 749 | kp->keylen = 0; |
| 750 | } else if (len == 0) { |
| 751 | /* |
| 752 | * Empty option, indicates a failure. |
| 753 | */ |
| 754 | if (kp->keylen == 0) |
| 755 | return; |
| 756 | kp->keylen = 0; |
| 757 | if (ep->keyid) |
| 758 | (void)(*ep->keyid)(dir, kp->keyid, &kp->keylen); |
| 759 | |
| 760 | } else if ((len != kp->keylen) || (bcmp(keyid, kp->keyid, len) != 0)) { |
| 761 | /* |
| 762 | * Length or contents are different |
| 763 | */ |
| 764 | kp->keylen = len; |
| 765 | bcopy(keyid, kp->keyid, len); |
| 766 | if (ep->keyid) |
| 767 | (void)(*ep->keyid)(dir, kp->keyid, &kp->keylen); |
| 768 | } else { |
| 769 | if (ep->keyid) |
| 770 | ret = (*ep->keyid)(dir, kp->keyid, &kp->keylen); |
| 771 | if ((ret == 0) && (dir == DIR_ENCRYPT) && autoencrypt) |
| 772 | encrypt_start_output(*kp->modep); |
| 773 | return; |
| 774 | } |
| 775 | |
| 776 | encrypt_send_keyid(dir, kp->keyid, kp->keylen, 0); |
| 777 | } |
| 778 | |
| 779 | void |
| 780 | encrypt_send_keyid(dir, keyid, keylen, saveit) |
| 781 | int dir; |
| 782 | unsigned char *keyid; |
| 783 | int keylen; |
| 784 | int saveit; |
| 785 | { |
| 786 | unsigned char *strp; |
| 787 | |
| 788 | str_keyid[3] = (dir == DIR_ENCRYPT) |
| 789 | ? ENCRYPT_ENC_KEYID : ENCRYPT_DEC_KEYID; |
| 790 | if (saveit) { |
| 791 | struct key_info *kp = &ki[(dir == DIR_ENCRYPT) ? 0 : 1]; |
| 792 | bcopy(keyid, kp->keyid, keylen); |
| 793 | kp->keylen = keylen; |
| 794 | } |
| 795 | |
| 796 | for (strp = &str_keyid[4]; keylen > 0; --keylen) { |
| 797 | if ((*strp++ = *keyid++) == IAC) |
| 798 | *strp++ = IAC; |
| 799 | } |
| 800 | *strp++ = IAC; |
| 801 | *strp++ = SE; |
| 802 | net_write(str_keyid, strp - str_keyid); |
| 803 | printsub('>', &str_keyid[2], strp - str_keyid - 2); |
| 804 | } |
| 805 | |
| 806 | void |
| 807 | encrypt_auto(on) |
| 808 | int on; |
| 809 | { |
| 810 | if (on < 0) |
| 811 | autoencrypt ^= 1; |
| 812 | else |
| 813 | autoencrypt = on ? 1 : 0; |
| 814 | } |
| 815 | |
| 816 | void |
| 817 | decrypt_auto(on) |
| 818 | int on; |
| 819 | { |
| 820 | if (on < 0) |
| 821 | autodecrypt ^= 1; |
| 822 | else |
| 823 | autodecrypt = on ? 1 : 0; |
| 824 | } |
| 825 | |
| 826 | void |
| 827 | encrypt_start_output(type) |
| 828 | int type; |
| 829 | { |
| 830 | Encryptions *ep; |
| 831 | register unsigned char *p; |
| 832 | register int i; |
| 833 | |
| 834 | if (!(ep = findencryption(type))) { |
| 835 | if (encrypt_debug_mode) { |
| 836 | printf(">>>%s: Can't encrypt with type %s (%d)\r\n", |
| 837 | Name, |
| 838 | ENCTYPE_NAME_OK(type) |
| 839 | ? ENCTYPE_NAME(type) : "(unknown)", |
| 840 | type); |
| 841 | } |
| 842 | return; |
| 843 | } |
| 844 | if (ep->start) { |
| 845 | i = (*ep->start)(DIR_ENCRYPT, Server); |
| 846 | if (encrypt_debug_mode) { |
| 847 | printf(">>>%s: Encrypt start: %s (%d) %s\r\n", |
| 848 | Name, |
| 849 | (i < 0) ? "failed" : |
| 850 | "initial negotiation in progress", |
| 851 | i, ENCTYPE_NAME(type)); |
| 852 | } |
| 853 | if (i) |
| 854 | return; |
| 855 | } |
| 856 | p = str_start + 3; |
| 857 | *p++ = ENCRYPT_START; |
| 858 | for (i = 0; i < ki[0].keylen; ++i) { |
| 859 | if ((*p++ = ki[0].keyid[i]) == IAC) |
| 860 | *p++ = IAC; |
| 861 | } |
| 862 | *p++ = IAC; |
| 863 | *p++ = SE; |
| 864 | net_write(str_start, p - str_start); |
| 865 | net_encrypt(); |
| 866 | printsub('>', &str_start[2], p - &str_start[2]); |
| 867 | /* |
| 868 | * If we are already encrypting in some mode, then |
| 869 | * encrypt the ring (which includes our request) in |
| 870 | * the old mode, mark it all as "clear text" and then |
| 871 | * switch to the new mode. |
| 872 | */ |
| 873 | encrypt_output = ep->output; |
| 874 | encrypt_mode = type; |
| 875 | if (encrypt_debug_mode) |
| 876 | printf(">>>%s: Started to encrypt output with type %s\r\n", |
| 877 | Name, ENCTYPE_NAME(type)); |
| 878 | if (encrypt_verbose) |
| 879 | printf("[ Output is now encrypted with type %s ]\r\n", |
| 880 | ENCTYPE_NAME(type)); |
| 881 | } |
| 882 | |
| 883 | void |
| 884 | encrypt_send_end() |
| 885 | { |
| 886 | if (!encrypt_output) |
| 887 | return; |
| 888 | |
| 889 | str_end[3] = ENCRYPT_END; |
| 890 | net_write(str_end, sizeof(str_end)); |
| 891 | net_encrypt(); |
| 892 | printsub('>', &str_end[2], sizeof(str_end) - 2); |
| 893 | /* |
| 894 | * Encrypt the output buffer now because it will not be done by |
| 895 | * netflush... |
| 896 | */ |
| 897 | encrypt_output = 0; |
| 898 | if (encrypt_debug_mode) |
| 899 | printf(">>>%s: Output is back to clear text\r\n", Name); |
| 900 | if (encrypt_verbose) |
| 901 | printf("[ Output is now clear text ]\r\n"); |
| 902 | } |
| 903 | |
| 904 | void |
| 905 | encrypt_send_request_start() |
| 906 | { |
| 907 | register unsigned char *p; |
| 908 | register int i; |
| 909 | |
| 910 | p = &str_start[3]; |
| 911 | *p++ = ENCRYPT_REQSTART; |
| 912 | for (i = 0; i < ki[1].keylen; ++i) { |
| 913 | if ((*p++ = ki[1].keyid[i]) == IAC) |
| 914 | *p++ = IAC; |
| 915 | } |
| 916 | *p++ = IAC; |
| 917 | *p++ = SE; |
| 918 | net_write(str_start, p - str_start); |
| 919 | printsub('>', &str_start[2], p - &str_start[2]); |
| 920 | if (encrypt_debug_mode) |
| 921 | printf(">>>%s: Request input to be encrypted\r\n", Name); |
| 922 | } |
| 923 | |
| 924 | void |
| 925 | encrypt_send_request_end() |
| 926 | { |
| 927 | str_end[3] = ENCRYPT_REQEND; |
| 928 | net_write(str_end, sizeof(str_end)); |
| 929 | printsub('>', &str_end[2], sizeof(str_end) - 2); |
| 930 | |
| 931 | if (encrypt_debug_mode) |
| 932 | printf(">>>%s: Request input to be clear text\r\n", Name); |
| 933 | } |
| 934 | |
| 935 | void |
| 936 | encrypt_wait() |
| 937 | { |
| 938 | register int encrypt, decrypt; |
| 939 | if (encrypt_debug_mode) |
| 940 | printf(">>>%s: in encrypt_wait\r\n", Name); |
| 941 | if (!havesessionkey || !(I_SUPPORT_ENCRYPT & remote_supports_decrypt)) |
| 942 | return; |
| 943 | while (autoencrypt && !encrypt_output) |
| 944 | if (telnet_spin()) |
| 945 | return; |
| 946 | } |
| 947 | |
| 948 | void |
| 949 | encrypt_debug(mode) |
| 950 | int mode; |
| 951 | { |
| 952 | encrypt_debug_mode = mode; |
| 953 | } |
| 954 | |
| 955 | void |
| 956 | encrypt_gen_printsub(data, cnt, buf, buflen) |
| 957 | unsigned char *data, *buf; |
| 958 | int cnt, buflen; |
| 959 | { |
| 960 | char tbuf[16], *cp; |
| 961 | |
| 962 | cnt -= 2; |
| 963 | data += 2; |
| 964 | buf[buflen-1] = '\0'; |
| 965 | buf[buflen-2] = '*'; |
| 966 | buflen -= 2;; |
| 967 | for (; cnt > 0; cnt--, data++) { |
| 968 | sprintf(tbuf, " %d", *data); |
| 969 | for (cp = tbuf; *cp && buflen > 0; --buflen) |
| 970 | *buf++ = *cp++; |
| 971 | if (buflen <= 0) |
| 972 | return; |
| 973 | } |
| 974 | *buf = '\0'; |
| 975 | } |
| 976 | |
| 977 | void |
| 978 | encrypt_printsub(data, cnt, buf, buflen) |
| 979 | unsigned char *data, *buf; |
| 980 | int cnt, buflen; |
| 981 | { |
| 982 | Encryptions *ep; |
| 983 | register int type = data[1]; |
| 984 | |
| 985 | for (ep = encryptions; ep->type && ep->type != type; ep++) |
| 986 | ; |
| 987 | |
| 988 | if (ep->printsub) |
| 989 | (*ep->printsub)(data, cnt, buf, buflen); |
| 990 | else |
| 991 | encrypt_gen_printsub(data, cnt, buf, buflen); |
| 992 | } |
| 993 | #endif |