[edae037] | 1 | /* zcrypt.c -- Read in a data stream from stdin & dump a decrypted/encrypted * |
---|
| 2 | * datastream. Reads the string to make the key from from the first * |
---|
| 3 | * parameter. Encrypts or decrypts according to -d or -e flag. (-e is * |
---|
| 4 | * default.) Will invoke zwrite if the -c option is provided for * |
---|
| 5 | * encryption. If a zephyr class is specified & the keyfile name omitted * |
---|
| 6 | * the ~/.crypt-table will be checked for "crypt-classname" and then * |
---|
| 7 | * "crypt-default" for the keyfile name. */ |
---|
| 8 | |
---|
| 9 | #include <stdio.h> |
---|
[6b1c3b6] | 10 | |
---|
| 11 | |
---|
[edae037] | 12 | #include <unistd.h> |
---|
| 13 | #include <sys/types.h> |
---|
| 14 | #include <des.h> |
---|
| 15 | #include <zephyr/zephyr.h> |
---|
[6b1c3b6] | 16 | #include <glib.h> |
---|
[edae037] | 17 | |
---|
| 18 | #define MAX_KEY 128 |
---|
| 19 | |
---|
| 20 | #ifndef TRUE |
---|
| 21 | #define TRUE -1 |
---|
| 22 | #endif |
---|
| 23 | #ifndef FALSE |
---|
| 24 | #define FALSE 0 |
---|
| 25 | #endif |
---|
| 26 | |
---|
| 27 | #define ZWRITE_OPT_NOAUTH (1<<0) |
---|
| 28 | #define ZWRITE_OPT_SIGNATURE (1<<1) |
---|
| 29 | #define ZWRITE_OPT_IGNOREVARS (1<<2) |
---|
| 30 | #define ZWRITE_OPT_VERBOSE (1<<3) |
---|
| 31 | #define ZWRITE_OPT_QUIET (1<<4) |
---|
| 32 | #define ZCRYPT_OPT_MESSAGE (1<<5) |
---|
| 33 | #define ZCRYPT_OPT_IGNOREDOT (1<<6) |
---|
| 34 | |
---|
| 35 | typedef struct |
---|
| 36 | { |
---|
| 37 | int flags; |
---|
| 38 | char *signature; |
---|
| 39 | char *message; |
---|
| 40 | } ZWRITEOPTIONS; |
---|
| 41 | |
---|
| 42 | char *GetZephyrVarKeyFile(char *whoami, char *class, char *instance); |
---|
| 43 | char *BuildArgString(char **argv, int start, int end); |
---|
| 44 | int do_encrypt(char *keystring, int zephyr, char *class, char *instance, |
---|
| 45 | ZWRITEOPTIONS *zoptions, char* keyfile); |
---|
| 46 | int do_decrypt(char *keystring); |
---|
| 47 | |
---|
| 48 | #define M_NONE 0 |
---|
| 49 | #define M_ZEPHYR_ENCRYPT 1 |
---|
| 50 | #define M_DECRYPT 2 |
---|
| 51 | #define M_ENCRYPT 3 |
---|
| 52 | #define M_RANDOMIZE 4 |
---|
| 53 | #define M_SETKEY 5 |
---|
| 54 | |
---|
| 55 | main(int argc, char *argv[]) |
---|
| 56 | { |
---|
| 57 | char *fname = NULL; |
---|
| 58 | int error = FALSE; |
---|
| 59 | int zephyr = FALSE; |
---|
| 60 | char *class = NULL, *instance = NULL; |
---|
| 61 | int mode = M_NONE; |
---|
| 62 | |
---|
| 63 | extern int optind, opterr; |
---|
| 64 | extern char *optarg; |
---|
| 65 | char c; |
---|
| 66 | |
---|
| 67 | int messageflag = FALSE; |
---|
| 68 | ZWRITEOPTIONS zoptions; |
---|
| 69 | zoptions.flags = 0; |
---|
| 70 | |
---|
| 71 | while ((c = getopt(argc, argv, "ZDERSF:c:i:advqtluons:f:m")) != (char)EOF) |
---|
| 72 | { |
---|
| 73 | switch(c) |
---|
| 74 | { |
---|
| 75 | case 'Z': |
---|
| 76 | /* Zephyr encrypt */ |
---|
| 77 | mode = M_ZEPHYR_ENCRYPT; |
---|
| 78 | break; |
---|
| 79 | case 'D': |
---|
| 80 | /* Decrypt */ |
---|
| 81 | mode = M_DECRYPT; |
---|
| 82 | break; |
---|
| 83 | case 'E': |
---|
| 84 | /* Encrypt */ |
---|
| 85 | mode = M_ENCRYPT; |
---|
| 86 | break; |
---|
| 87 | case 'R': |
---|
| 88 | /* Randomize the keyfile */ |
---|
| 89 | mode = M_RANDOMIZE; |
---|
| 90 | break; |
---|
| 91 | case 'S': |
---|
| 92 | /* Set a new key value from stdin */ |
---|
| 93 | mode = M_SETKEY; |
---|
| 94 | break; |
---|
| 95 | case 'F': |
---|
| 96 | /* Specify the keyfile explicitly */ |
---|
| 97 | if (fname != NULL) error = TRUE; |
---|
| 98 | fname = optarg; |
---|
| 99 | break; |
---|
| 100 | case 'c': |
---|
| 101 | /* Zwrite/zcrypt: class name */ |
---|
| 102 | if (class != NULL) error = TRUE; |
---|
| 103 | class = optarg; |
---|
| 104 | break; |
---|
| 105 | case 'i': |
---|
| 106 | /* Zwrite/zcrypt: instance name */ |
---|
| 107 | if (instance != NULL) error = TRUE; |
---|
| 108 | instance = optarg; |
---|
| 109 | break; |
---|
| 110 | case 'a': |
---|
| 111 | /* Zwrite: authenticate (default) */ |
---|
| 112 | zoptions.flags &= ~ZWRITE_OPT_NOAUTH; |
---|
| 113 | break; |
---|
| 114 | case 'd': |
---|
| 115 | /* Zwrite: do not authenticate */ |
---|
| 116 | zoptions.flags |= ZWRITE_OPT_NOAUTH; |
---|
| 117 | break; |
---|
| 118 | case 'v': |
---|
| 119 | /* Zwrite: verbose */ |
---|
| 120 | zoptions.flags |= ZWRITE_OPT_VERBOSE; |
---|
| 121 | break; |
---|
| 122 | case 'q': |
---|
| 123 | /* Zwrite: quiet */ |
---|
| 124 | zoptions.flags |= ZWRITE_OPT_QUIET; |
---|
| 125 | break; |
---|
| 126 | case 't': |
---|
| 127 | /* Zwrite: no expand tabs (ignored) */ |
---|
| 128 | break; |
---|
| 129 | case 'l': |
---|
| 130 | /* Zwrite: ignore '.' on a line by itself (ignored) */ |
---|
| 131 | zoptions.flags |= ZCRYPT_OPT_IGNOREDOT; |
---|
| 132 | break; |
---|
| 133 | case 'u': |
---|
| 134 | /* Zwrite: urgent message */ |
---|
| 135 | instance = "URGENT"; |
---|
| 136 | break; |
---|
| 137 | case 'o': |
---|
| 138 | /* Zwrite: ignore zephyr variables zwrite-class, zwrite-inst, */ |
---|
| 139 | /* zwrite-opcode */ |
---|
| 140 | zoptions.flags |= ZWRITE_OPT_IGNOREVARS; |
---|
| 141 | break; |
---|
| 142 | case 'n': |
---|
| 143 | /* Zwrite: prevent PING message (always used) */ |
---|
| 144 | break; |
---|
| 145 | case 's': |
---|
| 146 | /* Zwrite: signature */ |
---|
| 147 | zoptions.flags |= ZWRITE_OPT_SIGNATURE; |
---|
| 148 | zoptions.signature = optarg; |
---|
| 149 | break; |
---|
| 150 | case 'f': |
---|
| 151 | /* Zwrite: file system specification (ignored) */ |
---|
| 152 | break; |
---|
| 153 | case 'm': |
---|
| 154 | /* Message on rest of line*/ |
---|
| 155 | messageflag = TRUE; |
---|
| 156 | break; |
---|
| 157 | case '?': |
---|
| 158 | error = TRUE; |
---|
| 159 | break; |
---|
| 160 | } |
---|
| 161 | if (error || messageflag) |
---|
| 162 | break; |
---|
| 163 | } |
---|
| 164 | |
---|
| 165 | if (class != NULL || instance != NULL) |
---|
| 166 | zephyr = TRUE; |
---|
| 167 | |
---|
| 168 | if (messageflag) |
---|
| 169 | { |
---|
| 170 | zoptions.flags |= ZCRYPT_OPT_MESSAGE; |
---|
| 171 | zoptions.message = BuildArgString(argv, optind, argc); |
---|
| 172 | if (!zoptions.message) |
---|
| 173 | { |
---|
| 174 | printf("Memory allocation error.\n"); |
---|
| 175 | error = TRUE; |
---|
| 176 | } |
---|
| 177 | } |
---|
| 178 | else if (optind < argc) |
---|
| 179 | { |
---|
| 180 | error = TRUE; |
---|
| 181 | } |
---|
| 182 | |
---|
| 183 | if (mode == M_NONE) |
---|
| 184 | mode = (zephyr?M_ZEPHYR_ENCRYPT:M_ENCRYPT); |
---|
| 185 | |
---|
| 186 | if (mode == M_ZEPHYR_ENCRYPT && !zephyr) |
---|
| 187 | error = TRUE; |
---|
| 188 | |
---|
| 189 | if (!error && fname == NULL && (class != NULL || instance != NULL)) |
---|
| 190 | fname = GetZephyrVarKeyFile(argv[0], class, instance); |
---|
| 191 | |
---|
| 192 | if (error || fname == NULL) |
---|
| 193 | { |
---|
| 194 | printf("Usage: %s [-Z|-D|-E|-R|-S] [-F Keyfile] [-c class] [-i instance]\n", argv[0]); |
---|
| 195 | printf(" [-advqtluon] [-s signature] [-f arg] [-m message]\n"); |
---|
| 196 | printf(" One or more of class, instance, and keyfile must be specified.\n"); |
---|
| 197 | } |
---|
| 198 | else |
---|
| 199 | { |
---|
| 200 | if (mode == M_RANDOMIZE) |
---|
| 201 | { |
---|
| 202 | /* Choose a new, random key */ |
---|
| 203 | /* |
---|
| 204 | FILE *fkey = fopen(fname, "w"); |
---|
| 205 | if (!fkey) |
---|
| 206 | printf("Could not open key file for writing: %s\n", fname); |
---|
| 207 | else |
---|
| 208 | { |
---|
| 209 | char string[100]; |
---|
| 210 | fputs(fkey, string); |
---|
| 211 | fclose(fkey); |
---|
| 212 | } |
---|
| 213 | */ |
---|
| 214 | printf("Feature not yet implemented.\n"); |
---|
| 215 | } |
---|
| 216 | else if (mode == M_SETKEY) |
---|
| 217 | { |
---|
| 218 | /* Set a new, user-entered key */ |
---|
| 219 | char newkey[MAX_KEY]; |
---|
| 220 | FILE *fkey; |
---|
| 221 | |
---|
| 222 | if (isatty(0)) |
---|
| 223 | { |
---|
| 224 | printf("Enter new key: "); |
---|
| 225 | /* Really should read without echo!!! */ |
---|
| 226 | fgets(newkey, MAX_KEY - 1, stdin); |
---|
| 227 | } |
---|
| 228 | else |
---|
| 229 | fgets(newkey, MAX_KEY - 1, stdin); |
---|
| 230 | |
---|
| 231 | fkey = fopen(fname, "w"); |
---|
| 232 | if (!fkey) |
---|
| 233 | printf("Could not open key file for writing: %s\n", fname); |
---|
| 234 | else |
---|
| 235 | { |
---|
| 236 | if (fputs(newkey, fkey) != strlen(newkey) || putc('\n', fkey) != '\n') |
---|
| 237 | { |
---|
| 238 | printf("Error writing to key file.\n"); |
---|
| 239 | fclose(fkey); |
---|
| 240 | } |
---|
| 241 | else |
---|
| 242 | { |
---|
| 243 | fclose(fkey); |
---|
| 244 | printf("Key update complete.\n"); |
---|
| 245 | } |
---|
| 246 | } |
---|
| 247 | } |
---|
| 248 | else |
---|
| 249 | { |
---|
| 250 | /* Encrypt/decrypt */ |
---|
| 251 | FILE *fkey = fopen(fname, "r"); |
---|
| 252 | if (!fkey) |
---|
| 253 | printf("Could not open key file: %s\n", fname); |
---|
| 254 | else |
---|
| 255 | { |
---|
| 256 | char keystring[MAX_KEY]; |
---|
| 257 | fgets(keystring, MAX_KEY-1, fkey); |
---|
| 258 | if (mode == M_ZEPHYR_ENCRYPT || mode == M_ENCRYPT) |
---|
| 259 | do_encrypt(keystring, (mode == M_ZEPHYR_ENCRYPT), class, instance, |
---|
| 260 | &zoptions, fname); |
---|
| 261 | else |
---|
| 262 | do_decrypt(keystring); |
---|
| 263 | fclose(fkey); |
---|
| 264 | } |
---|
| 265 | } |
---|
| 266 | } |
---|
| 267 | |
---|
| 268 | /* Always print the **END** message if -D is specified. */ |
---|
| 269 | if (mode == M_DECRYPT) |
---|
| 270 | printf("**END**\n"); |
---|
| 271 | } |
---|
| 272 | |
---|
| 273 | /* Build a space-separated string from argv from elements between start * |
---|
| 274 | * and end - 1. malloc()'s the returned string. */ |
---|
| 275 | char *BuildArgString(char **argv, int start, int end) |
---|
| 276 | { |
---|
| 277 | int len = 1; |
---|
| 278 | int i; |
---|
| 279 | char *result; |
---|
| 280 | |
---|
| 281 | /* Compute the length of the string. (Plus 1 or 2) */ |
---|
| 282 | for (i = start; i < end; i++) |
---|
| 283 | len += strlen(argv[i]) + 1; |
---|
| 284 | |
---|
| 285 | /* Allocate memory */ |
---|
| 286 | result = (char *)malloc(len); |
---|
| 287 | if (result) |
---|
| 288 | { |
---|
| 289 | /* Build the string */ |
---|
| 290 | char *ptr = result; |
---|
| 291 | /* Start with an empty string, in case nothing is copied. */ |
---|
| 292 | *ptr = '\0'; |
---|
| 293 | /* Copy the arguments */ |
---|
| 294 | for (i = start; i < end; i++) |
---|
| 295 | { |
---|
| 296 | char *temp = argv[i]; |
---|
| 297 | /* Add a space, if not the first argument */ |
---|
| 298 | if (i != start) |
---|
| 299 | *ptr++ = ' '; |
---|
| 300 | /* Copy argv[i], leaving ptr pointing to the '\0' copied from temp */ |
---|
| 301 | while (*ptr = *temp++) |
---|
| 302 | ptr++; |
---|
| 303 | } |
---|
| 304 | } |
---|
| 305 | |
---|
| 306 | return result; |
---|
| 307 | } |
---|
| 308 | |
---|
| 309 | #define MAX_BUFF 258 |
---|
| 310 | #define MAX_SEARCH 3 |
---|
| 311 | /* Find the class/instance in the .crypt-table */ |
---|
| 312 | char *GetZephyrVarKeyFile(char *whoami, char *class, char *instance) |
---|
| 313 | { |
---|
| 314 | int retval; |
---|
| 315 | char *keyfile; |
---|
[6b1c3b6] | 316 | char *varname[MAX_SEARCH]; |
---|
[edae037] | 317 | int length[MAX_SEARCH], i; |
---|
| 318 | char buffer[MAX_BUFF]; |
---|
[6b1c3b6] | 319 | char *filename; |
---|
[edae037] | 320 | char result[MAX_SEARCH][MAX_BUFF]; |
---|
| 321 | int numsearch = 0; |
---|
| 322 | FILE *fsearch; |
---|
| 323 | |
---|
[6b1c3b6] | 324 | memset(varname, 0, sizeof(varname)); |
---|
| 325 | |
---|
[edae037] | 326 | /* Determine names to look for in .crypt-table */ |
---|
| 327 | if (instance) |
---|
[6b1c3b6] | 328 | varname[numsearch++] = g_strdup_printf("crypt-%s-%s:", (class?class:"message"), instance); |
---|
[edae037] | 329 | if (class) |
---|
[6b1c3b6] | 330 | varname[numsearch++] = g_strdup_printf("crypt-%s:", class); |
---|
| 331 | varname[numsearch++] = g_strdup("crypt-default:"); |
---|
[edae037] | 332 | |
---|
| 333 | /* Setup the result array, and determine string lengths */ |
---|
| 334 | for (i = 0; i < numsearch; i++) |
---|
| 335 | { |
---|
| 336 | result[i][0] = '\0'; |
---|
| 337 | length[i] = strlen(varname[i]); |
---|
| 338 | } |
---|
| 339 | |
---|
| 340 | /* Open~/.crypt-table */ |
---|
[6b1c3b6] | 341 | filename = g_strdup_printf("%s/.crypt-table", getenv("HOME")); |
---|
[edae037] | 342 | fsearch = fopen(filename, "r"); |
---|
| 343 | if (fsearch) |
---|
| 344 | { |
---|
| 345 | /* Scan file for a match */ |
---|
| 346 | while (!feof(fsearch)) |
---|
| 347 | { |
---|
| 348 | fgets(buffer, MAX_BUFF - 3, fsearch); |
---|
| 349 | for (i = 0; i < numsearch; i++) |
---|
| 350 | if (strncasecmp(varname[i], buffer, length[i]) == 0) |
---|
| 351 | { |
---|
| 352 | int j; |
---|
| 353 | for (j = length[i]; buffer[j] == ' '; j++) |
---|
| 354 | ; |
---|
| 355 | strcpy(result[i], &buffer[j]); |
---|
| 356 | if (*result[i]) |
---|
| 357 | if (result[i][strlen(result[i])-1] == '\n') |
---|
| 358 | result[i][strlen(result[i])-1] = '\0'; |
---|
| 359 | } |
---|
| 360 | } |
---|
| 361 | |
---|
| 362 | /* Pick the "best" match found */ |
---|
| 363 | keyfile = NULL; |
---|
| 364 | for (i = 0; i < numsearch; i++) |
---|
| 365 | if (*result[i]) |
---|
| 366 | { |
---|
| 367 | keyfile = result[i]; |
---|
| 368 | break; |
---|
| 369 | } |
---|
| 370 | |
---|
| 371 | if (keyfile == NULL) |
---|
| 372 | { |
---|
| 373 | printf("Could not find key table entry.\n"); |
---|
| 374 | } |
---|
| 375 | else |
---|
| 376 | { |
---|
| 377 | /* Prepare result to be returned */ |
---|
| 378 | char *temp = keyfile; |
---|
| 379 | keyfile = (char *)malloc(strlen(temp) + 1); |
---|
| 380 | if (keyfile) |
---|
| 381 | strcpy(keyfile, temp); |
---|
| 382 | else |
---|
| 383 | printf("Memory allocation error.\n"); |
---|
| 384 | } |
---|
| 385 | |
---|
| 386 | fclose(fsearch); |
---|
| 387 | } |
---|
| 388 | else |
---|
| 389 | printf("Could not open key table file: %s\n", filename); |
---|
| 390 | |
---|
[6b1c3b6] | 391 | for(i = 0; i < MAX_SEARCH; i++) { |
---|
| 392 | if(varname[i] != NULL) { |
---|
| 393 | g_free(varname[i]); |
---|
| 394 | } |
---|
| 395 | } |
---|
| 396 | |
---|
| 397 | if(filename != NULL) { |
---|
| 398 | g_free(filename); |
---|
| 399 | } |
---|
| 400 | |
---|
[edae037] | 401 | return keyfile; |
---|
| 402 | } |
---|
| 403 | |
---|
| 404 | static pid_t zephyrpipe_pid = 0; |
---|
| 405 | |
---|
| 406 | /* Open a pipe to zwrite */ |
---|
| 407 | FILE *GetZephyrPipe(char *class, char *instance, ZWRITEOPTIONS *zoptions) |
---|
| 408 | { |
---|
| 409 | int fildes[2]; |
---|
| 410 | pid_t pid; |
---|
| 411 | FILE *result; |
---|
| 412 | char *argv[20], argc = 0; |
---|
| 413 | |
---|
| 414 | if (pipe(fildes) < 0) |
---|
| 415 | return NULL; |
---|
| 416 | pid = fork(); |
---|
| 417 | |
---|
| 418 | if (pid < 0) |
---|
| 419 | { |
---|
| 420 | /* Error: clean up */ |
---|
| 421 | close(fildes[0]); |
---|
| 422 | close(fildes[1]); |
---|
| 423 | result = NULL; |
---|
| 424 | } |
---|
| 425 | else if (pid == 0) |
---|
| 426 | { |
---|
| 427 | /* Setup child process */ |
---|
| 428 | argv[argc++] = "zwrite"; |
---|
| 429 | argv[argc++] = "-n"; /* Always send without ping */ |
---|
| 430 | if (class) |
---|
| 431 | { |
---|
| 432 | argv[argc++] = "-c"; |
---|
| 433 | argv[argc++] = class; |
---|
| 434 | } |
---|
| 435 | if (instance) |
---|
| 436 | { |
---|
| 437 | argv[argc++] = "-i"; |
---|
| 438 | argv[argc++] = instance; |
---|
| 439 | } |
---|
| 440 | if (zoptions->flags & ZWRITE_OPT_NOAUTH) |
---|
| 441 | argv[argc++] = "-d"; |
---|
| 442 | if (zoptions->flags & ZWRITE_OPT_QUIET) |
---|
| 443 | argv[argc++] = "-q"; |
---|
| 444 | if (zoptions->flags & ZWRITE_OPT_VERBOSE) |
---|
| 445 | argv[argc++] = "-v"; |
---|
| 446 | if (zoptions->flags & ZWRITE_OPT_SIGNATURE) |
---|
| 447 | { |
---|
| 448 | argv[argc++] = "-s"; |
---|
| 449 | argv[argc++] = zoptions->signature; |
---|
| 450 | } |
---|
| 451 | argv[argc++] = "-O"; |
---|
| 452 | argv[argc++] = "crypt"; |
---|
| 453 | argv[argc] = NULL; |
---|
| 454 | close(fildes[1]); |
---|
| 455 | if (fildes[0] != STDIN_FILENO) |
---|
| 456 | { |
---|
| 457 | if (dup2(fildes[0], STDIN_FILENO) != STDIN_FILENO) |
---|
| 458 | exit(0); |
---|
| 459 | close(fildes[0]); |
---|
| 460 | } |
---|
| 461 | close(fildes[0]); |
---|
| 462 | execvp(argv[0], argv); |
---|
| 463 | printf("Exec error: could not run zwrite\n"); |
---|
| 464 | exit(0); |
---|
| 465 | } |
---|
| 466 | else |
---|
| 467 | { |
---|
| 468 | close(fildes[0]); |
---|
| 469 | /* Create a FILE * for the zwrite pipe */ |
---|
| 470 | result = (FILE *)fdopen(fildes[1], "w"); |
---|
| 471 | zephyrpipe_pid = pid; |
---|
| 472 | } |
---|
| 473 | |
---|
| 474 | return result; |
---|
| 475 | } |
---|
| 476 | |
---|
| 477 | /* Close the pipe to zwrite */ |
---|
| 478 | CloseZephyrPipe(FILE *pipe) |
---|
| 479 | { |
---|
| 480 | fclose(pipe); |
---|
| 481 | waitpid(zephyrpipe_pid, NULL, 0); |
---|
| 482 | zephyrpipe_pid = 0; |
---|
| 483 | } |
---|
| 484 | |
---|
| 485 | #define MAX_RESULT 2048 |
---|
| 486 | |
---|
| 487 | #define BASE_CODE 70 |
---|
| 488 | #define LAST_CODE (BASE_CODE + 15) |
---|
| 489 | #define OUTPUT_BLOCK_SIZE 16 |
---|
| 490 | |
---|
| 491 | block_to_ascii(char *output, FILE *outfile) |
---|
| 492 | { |
---|
| 493 | int i; |
---|
| 494 | for (i = 0; i < 8; i++) |
---|
| 495 | { |
---|
| 496 | putc(((output[i] & 0xf0) >> 4) + BASE_CODE, outfile); |
---|
| 497 | putc( (output[i] & 0x0f) + BASE_CODE, outfile); |
---|
| 498 | } |
---|
| 499 | } |
---|
| 500 | |
---|
| 501 | #define MAX_LINE 128 |
---|
| 502 | |
---|
| 503 | /* Encrypt stdin, with prompt if isatty, and send to stdout, or to zwrite |
---|
| 504 | if zephyr is set. */ |
---|
| 505 | int do_encrypt(char *keystring, int zephyr, char *class, char *instance, |
---|
| 506 | ZWRITEOPTIONS *zoptions, char* keyfile) |
---|
| 507 | { |
---|
| 508 | des_cblock key; |
---|
| 509 | des_key_schedule schedule; |
---|
| 510 | char input[8], output[8]; |
---|
| 511 | int size; |
---|
| 512 | int save_result = zephyr && isatty(0); |
---|
| 513 | FILE *outfile = stdout; |
---|
| 514 | int error = FALSE; |
---|
| 515 | char *inbuff = NULL, *inptr; |
---|
| 516 | int freein = FALSE; |
---|
| 517 | int use_buffer = FALSE; |
---|
| 518 | int num_blocks, last_block_size; |
---|
| 519 | |
---|
| 520 | des_string_to_key(keystring, key); |
---|
| 521 | des_key_sched(key, schedule); |
---|
| 522 | |
---|
| 523 | if (zephyr) |
---|
| 524 | { |
---|
| 525 | if (zoptions->flags & ZCRYPT_OPT_MESSAGE) |
---|
| 526 | { |
---|
| 527 | /* Use the -m message */ |
---|
| 528 | int length; |
---|
| 529 | inbuff = zoptions->message; |
---|
| 530 | length = strlen(inbuff); |
---|
| 531 | num_blocks = (length + 7) / 8; |
---|
| 532 | last_block_size = ((length + 7) % 8) + 1; |
---|
| 533 | use_buffer = TRUE; |
---|
| 534 | } |
---|
| 535 | else if (isatty(0)) |
---|
| 536 | { |
---|
| 537 | /* tty input, so show the "Type your message now..." message */ |
---|
| 538 | if (zoptions->flags & ZCRYPT_OPT_IGNOREDOT) |
---|
| 539 | printf("Type your message now. End with the end-of-file character.\n"); |
---|
| 540 | else |
---|
| 541 | printf("Type your message now. End with control-D or a dot on a line by itself.\n"); |
---|
| 542 | use_buffer = TRUE; |
---|
| 543 | if ((inptr = inbuff = (char *)malloc(MAX_RESULT)) == NULL) |
---|
| 544 | { |
---|
| 545 | printf("Memory allocation error\n"); |
---|
| 546 | return FALSE; |
---|
| 547 | } |
---|
| 548 | while (inptr - inbuff < MAX_RESULT - MAX_LINE - 20) |
---|
| 549 | { |
---|
| 550 | fgets(inptr, MAX_LINE, stdin); |
---|
| 551 | if (inptr[0]) |
---|
| 552 | { |
---|
| 553 | if (inptr[0] == '.' && inptr[1] == '\n' && |
---|
| 554 | !(zoptions->flags & ZCRYPT_OPT_IGNOREDOT)) |
---|
| 555 | { |
---|
| 556 | inptr[0] = '\0'; |
---|
| 557 | break; |
---|
| 558 | } |
---|
| 559 | else |
---|
| 560 | inptr += strlen(inptr); |
---|
| 561 | } |
---|
| 562 | else |
---|
| 563 | break; |
---|
| 564 | } |
---|
| 565 | num_blocks = (inptr - inbuff + 7) / 8; |
---|
| 566 | last_block_size = ((inptr - inbuff + 7) % 8) + 1; |
---|
| 567 | freein = TRUE; |
---|
| 568 | } |
---|
| 569 | |
---|
| 570 | /* if (zephyr) */ |
---|
| 571 | outfile = GetZephyrPipe(class, instance, zoptions); |
---|
| 572 | if (!outfile) |
---|
| 573 | { |
---|
| 574 | printf("Could not run zwrite\n"); |
---|
| 575 | if (freein && inbuff) |
---|
| 576 | free(inbuff); |
---|
| 577 | return FALSE; |
---|
| 578 | } |
---|
| 579 | } |
---|
| 580 | |
---|
| 581 | inptr = inbuff; |
---|
| 582 | |
---|
| 583 | /* Encrypt the input (inbuff or stdin) and send it to outfile */ |
---|
| 584 | while (TRUE) |
---|
| 585 | { |
---|
| 586 | if (use_buffer) |
---|
| 587 | { |
---|
| 588 | /* Get 8 bytes from buffer */ |
---|
| 589 | if (num_blocks > 1) |
---|
| 590 | { |
---|
| 591 | size = 8; |
---|
| 592 | memcpy(input, inptr, size); |
---|
| 593 | inptr += 8; |
---|
| 594 | num_blocks--; |
---|
| 595 | } |
---|
| 596 | else if (num_blocks == 1) |
---|
| 597 | { |
---|
| 598 | size = last_block_size; |
---|
| 599 | memcpy(input, inptr, size); |
---|
| 600 | num_blocks--; |
---|
| 601 | } |
---|
| 602 | else |
---|
| 603 | size = 0; |
---|
| 604 | } |
---|
| 605 | else |
---|
| 606 | /* Get 8 bytes from stdin */ |
---|
| 607 | size = fread(input, 1, 8, stdin); |
---|
| 608 | |
---|
| 609 | /* Check for EOF and pad the string to 8 chars, if needed */ |
---|
| 610 | if (size == 0) |
---|
| 611 | break; /* END OF INPUT: BREAK FROM while LOOP! */ |
---|
| 612 | if (size < 8) |
---|
| 613 | memset(input + size, 0, 8 - size); |
---|
| 614 | |
---|
| 615 | /* Encrypt and output the block */ |
---|
| 616 | des_ecb_encrypt(input, output, schedule, TRUE); |
---|
| 617 | block_to_ascii(output, outfile); |
---|
| 618 | |
---|
| 619 | if (size < 8) |
---|
| 620 | break; |
---|
| 621 | } |
---|
| 622 | |
---|
| 623 | /* Close out the output */ |
---|
| 624 | if (!error) |
---|
| 625 | putc('\n', outfile); |
---|
| 626 | if (zephyr) |
---|
| 627 | CloseZephyrPipe(outfile); |
---|
| 628 | |
---|
| 629 | /* Free the input buffer, if necessary */ |
---|
| 630 | if (freein && inbuff) |
---|
| 631 | free(inbuff); |
---|
| 632 | |
---|
| 633 | return !error; |
---|
| 634 | } |
---|
| 635 | |
---|
| 636 | /* Read a half-byte from stdin, skipping invalid characters. Returns -1 |
---|
| 637 | if at EOF or file error */ |
---|
| 638 | int read_ascii_nybble() |
---|
| 639 | { |
---|
| 640 | char c; |
---|
| 641 | |
---|
| 642 | while (TRUE) |
---|
| 643 | { |
---|
| 644 | if (fread(&c, 1, 1, stdin) == 0) |
---|
| 645 | return -1; |
---|
| 646 | else if (c >= BASE_CODE && c <= LAST_CODE) |
---|
| 647 | return c - BASE_CODE; |
---|
| 648 | } |
---|
| 649 | } |
---|
| 650 | |
---|
| 651 | /* Read both halves of the byte and return the single byte. Returns -1 |
---|
| 652 | if at EOF or file error. */ |
---|
| 653 | int read_ascii_byte() |
---|
| 654 | { |
---|
| 655 | int c1, c2; |
---|
| 656 | c1 = read_ascii_nybble(); |
---|
| 657 | if (c1 >= 0) |
---|
| 658 | { |
---|
| 659 | c2 = read_ascii_nybble(); |
---|
| 660 | if (c2 >= 0) |
---|
| 661 | { |
---|
| 662 | return c1 * 0x10 + c2; |
---|
| 663 | } |
---|
| 664 | } |
---|
| 665 | return -1; |
---|
| 666 | } |
---|
| 667 | |
---|
| 668 | /* Read an 8-byte DES block from stdin */ |
---|
| 669 | int read_ascii_block(char *input) |
---|
| 670 | { |
---|
| 671 | int c; |
---|
| 672 | |
---|
| 673 | int i; |
---|
| 674 | for (i = 0; i < 8; i++) |
---|
| 675 | { |
---|
| 676 | c = read_ascii_byte(); |
---|
| 677 | if (c < 0) |
---|
| 678 | return FALSE; |
---|
| 679 | |
---|
| 680 | input[i] = c; |
---|
| 681 | } |
---|
| 682 | |
---|
| 683 | return TRUE; |
---|
| 684 | } |
---|
| 685 | |
---|
| 686 | /* Decrypt stdin */ |
---|
| 687 | int do_decrypt(char *keystring) |
---|
| 688 | { |
---|
| 689 | des_cblock key; |
---|
| 690 | des_key_schedule schedule; |
---|
| 691 | char input[8], output[9]; |
---|
| 692 | int size; |
---|
| 693 | |
---|
| 694 | output[0] = '\0'; /* In case no message at all */ |
---|
| 695 | output[8] = '\0'; /* NULL at end will limit string length to 8 */ |
---|
| 696 | |
---|
| 697 | des_string_to_key(keystring, key); |
---|
| 698 | des_key_sched(key, schedule); |
---|
| 699 | |
---|
| 700 | while (read_ascii_block(input)) |
---|
| 701 | { |
---|
| 702 | des_ecb_encrypt(input, output, schedule, FALSE); |
---|
| 703 | printf("%s", output); |
---|
| 704 | } |
---|
| 705 | |
---|
| 706 | if (output[0]) |
---|
| 707 | { |
---|
| 708 | if (output[strlen(output)-1] != '\n') |
---|
| 709 | printf("\n"); |
---|
| 710 | } |
---|
| 711 | else |
---|
| 712 | printf("\n"); |
---|
| 713 | } |
---|