| 1 | /* |
| 2 | * uxstore.c: Unix-specific implementation of the interface defined |
| 3 | * in storage.h. |
| 4 | */ |
| 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <string.h> |
| 9 | #include <assert.h> |
| 10 | #include <errno.h> |
| 11 | #include <ctype.h> |
| 12 | #include <unistd.h> |
| 13 | #include <fcntl.h> |
| 14 | #include <dirent.h> |
| 15 | #include <sys/stat.h> |
| 16 | #include <sys/types.h> |
| 17 | #include "putty.h" |
| 18 | #include "storage.h" |
| 19 | #include "tree234.h" |
| 20 | |
| 21 | enum { |
| 22 | INDEX_DIR, INDEX_HOSTKEYS, INDEX_HOSTKEYS_TMP, INDEX_RANDSEED, |
| 23 | INDEX_SESSIONDIR, INDEX_SESSION, |
| 24 | }; |
| 25 | |
| 26 | static const char hex[16] = "0123456789ABCDEF"; |
| 27 | |
| 28 | static char *mungestr(const char *in) |
| 29 | { |
| 30 | char *out, *ret; |
| 31 | |
| 32 | if (!in || !*in) |
| 33 | in = "Default Settings"; |
| 34 | |
| 35 | ret = out = snewn(3*strlen(in)+1, char); |
| 36 | |
| 37 | while (*in) { |
| 38 | /* |
| 39 | * There are remarkably few punctuation characters that |
| 40 | * aren't shell-special in some way or likely to be used as |
| 41 | * separators in some file format or another! Hence we use |
| 42 | * opt-in for safe characters rather than opt-out for |
| 43 | * specific unsafe ones... |
| 44 | */ |
| 45 | if (*in!='+' && *in!='-' && *in!='.' && *in!='@' && *in!='_' && |
| 46 | !(*in >= '0' && *in <= '9') && |
| 47 | !(*in >= 'A' && *in <= 'Z') && |
| 48 | !(*in >= 'a' && *in <= 'z')) { |
| 49 | *out++ = '%'; |
| 50 | *out++ = hex[((unsigned char) *in) >> 4]; |
| 51 | *out++ = hex[((unsigned char) *in) & 15]; |
| 52 | } else |
| 53 | *out++ = *in; |
| 54 | in++; |
| 55 | } |
| 56 | *out = '\0'; |
| 57 | return ret; |
| 58 | } |
| 59 | |
| 60 | static char *unmungestr(const char *in) |
| 61 | { |
| 62 | char *out, *ret; |
| 63 | out = ret = snewn(strlen(in)+1, char); |
| 64 | while (*in) { |
| 65 | if (*in == '%' && in[1] && in[2]) { |
| 66 | int i, j; |
| 67 | |
| 68 | i = in[1] - '0'; |
| 69 | i -= (i > 9 ? 7 : 0); |
| 70 | j = in[2] - '0'; |
| 71 | j -= (j > 9 ? 7 : 0); |
| 72 | |
| 73 | *out++ = (i << 4) + j; |
| 74 | in += 3; |
| 75 | } else { |
| 76 | *out++ = *in++; |
| 77 | } |
| 78 | } |
| 79 | *out = '\0'; |
| 80 | return ret; |
| 81 | } |
| 82 | |
| 83 | static void make_filename(char *filename, int index, const char *subname) |
| 84 | { |
| 85 | char *home; |
| 86 | int len; |
| 87 | home = getenv("HOME"); |
| 88 | strncpy(filename, home, FILENAME_MAX); |
| 89 | len = strlen(filename); |
| 90 | if (index == INDEX_SESSION) { |
| 91 | char *munged = mungestr(subname); |
| 92 | char *fn = dupprintf("/.putty/sessions/%s", munged); |
| 93 | strncpy(filename + len, fn, FILENAME_MAX - len); |
| 94 | sfree(fn); |
| 95 | sfree(munged); |
| 96 | } else { |
| 97 | strncpy(filename + len, |
| 98 | index == INDEX_DIR ? "/.putty" : |
| 99 | index == INDEX_SESSIONDIR ? "/.putty/sessions" : |
| 100 | index == INDEX_HOSTKEYS ? "/.putty/sshhostkeys" : |
| 101 | index == INDEX_HOSTKEYS_TMP ? "/.putty/sshhostkeys.tmp" : |
| 102 | index == INDEX_RANDSEED ? "/.putty/randomseed" : |
| 103 | "/.putty/ERROR", FILENAME_MAX - len); |
| 104 | } |
| 105 | filename[FILENAME_MAX-1] = '\0'; |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * Read an entire line of text from a file. Return a buffer |
| 110 | * malloced to be as big as necessary (caller must free). |
| 111 | */ |
| 112 | static char *fgetline(FILE *fp) |
| 113 | { |
| 114 | char *ret = snewn(512, char); |
| 115 | int size = 512, len = 0; |
| 116 | while (fgets(ret + len, size - len, fp)) { |
| 117 | len += strlen(ret + len); |
| 118 | if (ret[len-1] == '\n') |
| 119 | break; /* got a newline, we're done */ |
| 120 | size = len + 512; |
| 121 | ret = sresize(ret, size, char); |
| 122 | } |
| 123 | if (len == 0) { /* first fgets returned NULL */ |
| 124 | sfree(ret); |
| 125 | return NULL; |
| 126 | } |
| 127 | ret[len] = '\0'; |
| 128 | return ret; |
| 129 | } |
| 130 | |
| 131 | void *open_settings_w(const char *sessionname, char **errmsg) |
| 132 | { |
| 133 | char filename[FILENAME_MAX]; |
| 134 | FILE *fp; |
| 135 | |
| 136 | *errmsg = NULL; |
| 137 | |
| 138 | /* |
| 139 | * Start by making sure the .putty directory and its sessions |
| 140 | * subdir actually exist. Ignore error returns from mkdir since |
| 141 | * they're perfectly likely to be `already exists', and any |
| 142 | * other error will trip us up later on so there's no real need |
| 143 | * to catch it now. |
| 144 | */ |
| 145 | make_filename(filename, INDEX_DIR, sessionname); |
| 146 | mkdir(filename, 0700); |
| 147 | make_filename(filename, INDEX_SESSIONDIR, sessionname); |
| 148 | mkdir(filename, 0700); |
| 149 | |
| 150 | make_filename(filename, INDEX_SESSION, sessionname); |
| 151 | fp = fopen(filename, "w"); |
| 152 | if (!fp) { |
| 153 | *errmsg = dupprintf("Unable to create %s: %s", |
| 154 | filename, strerror(errno)); |
| 155 | return NULL; /* can't open */ |
| 156 | } |
| 157 | return fp; |
| 158 | } |
| 159 | |
| 160 | void write_setting_s(void *handle, const char *key, const char *value) |
| 161 | { |
| 162 | FILE *fp = (FILE *)handle; |
| 163 | fprintf(fp, "%s=%s\n", key, value); |
| 164 | } |
| 165 | |
| 166 | void write_setting_i(void *handle, const char *key, int value) |
| 167 | { |
| 168 | FILE *fp = (FILE *)handle; |
| 169 | fprintf(fp, "%s=%d\n", key, value); |
| 170 | } |
| 171 | |
| 172 | void close_settings_w(void *handle) |
| 173 | { |
| 174 | FILE *fp = (FILE *)handle; |
| 175 | fclose(fp); |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * Reading settings, for the moment, is done by retrieving X |
| 180 | * resources from the X display. When we introduce disk files, I |
| 181 | * think what will happen is that the X resources will override |
| 182 | * PuTTY's inbuilt defaults, but that the disk files will then |
| 183 | * override those. This isn't optimal, but it's the best I can |
| 184 | * immediately work out. |
| 185 | * FIXME: the above comment is a bit out of date. Did it happen? |
| 186 | */ |
| 187 | |
| 188 | struct keyval { |
| 189 | const char *key; |
| 190 | const char *value; |
| 191 | }; |
| 192 | |
| 193 | static tree234 *xrmtree = NULL; |
| 194 | |
| 195 | int keycmp(void *av, void *bv) |
| 196 | { |
| 197 | struct keyval *a = (struct keyval *)av; |
| 198 | struct keyval *b = (struct keyval *)bv; |
| 199 | return strcmp(a->key, b->key); |
| 200 | } |
| 201 | |
| 202 | void provide_xrm_string(char *string) |
| 203 | { |
| 204 | char *p, *q, *key; |
| 205 | struct keyval *xrms, *ret; |
| 206 | |
| 207 | p = q = strchr(string, ':'); |
| 208 | if (!q) { |
| 209 | fprintf(stderr, "pterm: expected a colon in resource string" |
| 210 | " \"%s\"\n", string); |
| 211 | return; |
| 212 | } |
| 213 | q++; |
| 214 | while (p > string && p[-1] != '.' && p[-1] != '*') |
| 215 | p--; |
| 216 | xrms = snew(struct keyval); |
| 217 | key = snewn(q-p, char); |
| 218 | memcpy(key, p, q-p); |
| 219 | key[q-p-1] = '\0'; |
| 220 | xrms->key = key; |
| 221 | while (*q && isspace((unsigned char)*q)) |
| 222 | q++; |
| 223 | xrms->value = dupstr(q); |
| 224 | |
| 225 | if (!xrmtree) |
| 226 | xrmtree = newtree234(keycmp); |
| 227 | |
| 228 | ret = add234(xrmtree, xrms); |
| 229 | if (ret) { |
| 230 | /* Override an existing string. */ |
| 231 | del234(xrmtree, ret); |
| 232 | add234(xrmtree, xrms); |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | const char *get_setting(const char *key) |
| 237 | { |
| 238 | struct keyval tmp, *ret; |
| 239 | tmp.key = key; |
| 240 | if (xrmtree) { |
| 241 | ret = find234(xrmtree, &tmp, NULL); |
| 242 | if (ret) |
| 243 | return ret->value; |
| 244 | } |
| 245 | return x_get_default(key); |
| 246 | } |
| 247 | |
| 248 | void *open_settings_r(const char *sessionname) |
| 249 | { |
| 250 | char filename[FILENAME_MAX]; |
| 251 | FILE *fp; |
| 252 | char *line; |
| 253 | tree234 *ret; |
| 254 | |
| 255 | make_filename(filename, INDEX_SESSION, sessionname); |
| 256 | fp = fopen(filename, "r"); |
| 257 | if (!fp) |
| 258 | return NULL; /* can't open */ |
| 259 | |
| 260 | ret = newtree234(keycmp); |
| 261 | |
| 262 | while ( (line = fgetline(fp)) ) { |
| 263 | char *value = strchr(line, '='); |
| 264 | struct keyval *kv; |
| 265 | |
| 266 | if (!value) |
| 267 | continue; |
| 268 | *value++ = '\0'; |
| 269 | value[strcspn(value, "\r\n")] = '\0'; /* trim trailing NL */ |
| 270 | |
| 271 | kv = snew(struct keyval); |
| 272 | kv->key = dupstr(line); |
| 273 | kv->value = dupstr(value); |
| 274 | add234(ret, kv); |
| 275 | |
| 276 | sfree(line); |
| 277 | } |
| 278 | |
| 279 | fclose(fp); |
| 280 | |
| 281 | return ret; |
| 282 | } |
| 283 | |
| 284 | char *read_setting_s(void *handle, const char *key, char *buffer, int buflen) |
| 285 | { |
| 286 | tree234 *tree = (tree234 *)handle; |
| 287 | const char *val; |
| 288 | struct keyval tmp, *kv; |
| 289 | |
| 290 | tmp.key = key; |
| 291 | if (tree != NULL && |
| 292 | (kv = find234(tree, &tmp, NULL)) != NULL) { |
| 293 | val = kv->value; |
| 294 | assert(val != NULL); |
| 295 | } else |
| 296 | val = get_setting(key); |
| 297 | |
| 298 | if (!val) |
| 299 | return NULL; |
| 300 | else { |
| 301 | strncpy(buffer, val, buflen); |
| 302 | buffer[buflen-1] = '\0'; |
| 303 | return buffer; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | int read_setting_i(void *handle, const char *key, int defvalue) |
| 308 | { |
| 309 | tree234 *tree = (tree234 *)handle; |
| 310 | const char *val; |
| 311 | struct keyval tmp, *kv; |
| 312 | |
| 313 | tmp.key = key; |
| 314 | if (tree != NULL && |
| 315 | (kv = find234(tree, &tmp, NULL)) != NULL) { |
| 316 | val = kv->value; |
| 317 | assert(val != NULL); |
| 318 | } else |
| 319 | val = get_setting(key); |
| 320 | |
| 321 | if (!val) |
| 322 | return defvalue; |
| 323 | else |
| 324 | return atoi(val); |
| 325 | } |
| 326 | |
| 327 | int read_setting_fontspec(void *handle, const char *name, FontSpec *result) |
| 328 | { |
| 329 | return !!read_setting_s(handle, name, result->name, sizeof(result->name)); |
| 330 | } |
| 331 | int read_setting_filename(void *handle, const char *name, Filename *result) |
| 332 | { |
| 333 | return !!read_setting_s(handle, name, result->path, sizeof(result->path)); |
| 334 | } |
| 335 | |
| 336 | void write_setting_fontspec(void *handle, const char *name, FontSpec result) |
| 337 | { |
| 338 | write_setting_s(handle, name, result.name); |
| 339 | } |
| 340 | void write_setting_filename(void *handle, const char *name, Filename result) |
| 341 | { |
| 342 | write_setting_s(handle, name, result.path); |
| 343 | } |
| 344 | |
| 345 | void close_settings_r(void *handle) |
| 346 | { |
| 347 | tree234 *tree = (tree234 *)handle; |
| 348 | struct keyval *kv; |
| 349 | |
| 350 | if (!tree) |
| 351 | return; |
| 352 | |
| 353 | while ( (kv = index234(tree, 0)) != NULL) { |
| 354 | del234(tree, kv); |
| 355 | sfree((char *)kv->key); |
| 356 | sfree((char *)kv->value); |
| 357 | sfree(kv); |
| 358 | } |
| 359 | |
| 360 | freetree234(tree); |
| 361 | } |
| 362 | |
| 363 | void del_settings(const char *sessionname) |
| 364 | { |
| 365 | char filename[FILENAME_MAX]; |
| 366 | make_filename(filename, INDEX_SESSION, sessionname); |
| 367 | unlink(filename); |
| 368 | } |
| 369 | |
| 370 | void *enum_settings_start(void) |
| 371 | { |
| 372 | DIR *dp; |
| 373 | char filename[FILENAME_MAX]; |
| 374 | |
| 375 | make_filename(filename, INDEX_SESSIONDIR, NULL); |
| 376 | dp = opendir(filename); |
| 377 | |
| 378 | return dp; |
| 379 | } |
| 380 | |
| 381 | char *enum_settings_next(void *handle, char *buffer, int buflen) |
| 382 | { |
| 383 | DIR *dp = (DIR *)handle; |
| 384 | struct dirent *de; |
| 385 | struct stat st; |
| 386 | char fullpath[FILENAME_MAX]; |
| 387 | int len; |
| 388 | char *unmunged; |
| 389 | |
| 390 | make_filename(fullpath, INDEX_SESSIONDIR, NULL); |
| 391 | len = strlen(fullpath); |
| 392 | |
| 393 | while ( (de = readdir(dp)) != NULL ) { |
| 394 | if (len < FILENAME_MAX) { |
| 395 | fullpath[len] = '/'; |
| 396 | strncpy(fullpath+len+1, de->d_name, FILENAME_MAX-(len+1)); |
| 397 | fullpath[FILENAME_MAX-1] = '\0'; |
| 398 | } |
| 399 | |
| 400 | if (stat(fullpath, &st) < 0 || !S_ISREG(st.st_mode)) |
| 401 | continue; /* try another one */ |
| 402 | |
| 403 | unmunged = unmungestr(de->d_name); |
| 404 | strncpy(buffer, unmunged, buflen); |
| 405 | buffer[buflen-1] = '\0'; |
| 406 | sfree(unmunged); |
| 407 | return buffer; |
| 408 | } |
| 409 | |
| 410 | return NULL; |
| 411 | } |
| 412 | |
| 413 | void enum_settings_finish(void *handle) |
| 414 | { |
| 415 | DIR *dp = (DIR *)handle; |
| 416 | closedir(dp); |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * Lines in the host keys file are of the form |
| 421 | * |
| 422 | * type@port:hostname keydata |
| 423 | * |
| 424 | * e.g. |
| 425 | * |
| 426 | * rsa@22:foovax.example.org 0x23,0x293487364395345345....2343 |
| 427 | */ |
| 428 | int verify_host_key(const char *hostname, int port, |
| 429 | const char *keytype, const char *key) |
| 430 | { |
| 431 | FILE *fp; |
| 432 | char filename[FILENAME_MAX]; |
| 433 | char *line; |
| 434 | int ret; |
| 435 | |
| 436 | make_filename(filename, INDEX_HOSTKEYS, NULL); |
| 437 | fp = fopen(filename, "r"); |
| 438 | if (!fp) |
| 439 | return 1; /* key does not exist */ |
| 440 | |
| 441 | ret = 1; |
| 442 | while ( (line = fgetline(fp)) ) { |
| 443 | int i; |
| 444 | char *p = line; |
| 445 | char porttext[20]; |
| 446 | |
| 447 | line[strcspn(line, "\n")] = '\0'; /* strip trailing newline */ |
| 448 | |
| 449 | i = strlen(keytype); |
| 450 | if (strncmp(p, keytype, i)) |
| 451 | goto done; |
| 452 | p += i; |
| 453 | |
| 454 | if (*p != '@') |
| 455 | goto done; |
| 456 | p++; |
| 457 | |
| 458 | sprintf(porttext, "%d", port); |
| 459 | i = strlen(porttext); |
| 460 | if (strncmp(p, porttext, i)) |
| 461 | goto done; |
| 462 | p += i; |
| 463 | |
| 464 | if (*p != ':') |
| 465 | goto done; |
| 466 | p++; |
| 467 | |
| 468 | i = strlen(hostname); |
| 469 | if (strncmp(p, hostname, i)) |
| 470 | goto done; |
| 471 | p += i; |
| 472 | |
| 473 | if (*p != ' ') |
| 474 | goto done; |
| 475 | p++; |
| 476 | |
| 477 | /* |
| 478 | * Found the key. Now just work out whether it's the right |
| 479 | * one or not. |
| 480 | */ |
| 481 | if (!strcmp(p, key)) |
| 482 | ret = 0; /* key matched OK */ |
| 483 | else |
| 484 | ret = 2; /* key mismatch */ |
| 485 | |
| 486 | done: |
| 487 | sfree(line); |
| 488 | if (ret != 1) |
| 489 | break; |
| 490 | } |
| 491 | |
| 492 | fclose(fp); |
| 493 | return ret; |
| 494 | } |
| 495 | |
| 496 | void store_host_key(const char *hostname, int port, |
| 497 | const char *keytype, const char *key) |
| 498 | { |
| 499 | FILE *rfp, *wfp; |
| 500 | char *newtext, *line; |
| 501 | int headerlen; |
| 502 | char filename[FILENAME_MAX], tmpfilename[FILENAME_MAX]; |
| 503 | |
| 504 | newtext = dupprintf("%s@%d:%s %s\n", keytype, port, hostname, key); |
| 505 | headerlen = 1 + strcspn(newtext, " "); /* count the space too */ |
| 506 | |
| 507 | /* |
| 508 | * Open both the old file and a new file. |
| 509 | */ |
| 510 | make_filename(tmpfilename, INDEX_HOSTKEYS_TMP, NULL); |
| 511 | wfp = fopen(tmpfilename, "w"); |
| 512 | if (!wfp) { |
| 513 | char dir[FILENAME_MAX]; |
| 514 | |
| 515 | make_filename(dir, INDEX_DIR, NULL); |
| 516 | mkdir(dir, 0700); |
| 517 | wfp = fopen(tmpfilename, "w"); |
| 518 | } |
| 519 | if (!wfp) |
| 520 | return; |
| 521 | make_filename(filename, INDEX_HOSTKEYS, NULL); |
| 522 | rfp = fopen(filename, "r"); |
| 523 | |
| 524 | /* |
| 525 | * Copy all lines from the old file to the new one that _don't_ |
| 526 | * involve the same host key identifier as the one we're adding. |
| 527 | */ |
| 528 | if (rfp) { |
| 529 | while ( (line = fgetline(rfp)) ) { |
| 530 | if (strncmp(line, newtext, headerlen)) |
| 531 | fputs(line, wfp); |
| 532 | } |
| 533 | fclose(rfp); |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * Now add the new line at the end. |
| 538 | */ |
| 539 | fputs(newtext, wfp); |
| 540 | |
| 541 | fclose(wfp); |
| 542 | |
| 543 | rename(tmpfilename, filename); |
| 544 | |
| 545 | sfree(newtext); |
| 546 | } |
| 547 | |
| 548 | void read_random_seed(noise_consumer_t consumer) |
| 549 | { |
| 550 | int fd; |
| 551 | char fname[FILENAME_MAX]; |
| 552 | |
| 553 | make_filename(fname, INDEX_RANDSEED, NULL); |
| 554 | fd = open(fname, O_RDONLY); |
| 555 | if (fd) { |
| 556 | char buf[512]; |
| 557 | int ret; |
| 558 | while ( (ret = read(fd, buf, sizeof(buf))) > 0) |
| 559 | consumer(buf, ret); |
| 560 | close(fd); |
| 561 | } |
| 562 | } |
| 563 | |
| 564 | void write_random_seed(void *data, int len) |
| 565 | { |
| 566 | int fd; |
| 567 | char fname[FILENAME_MAX]; |
| 568 | |
| 569 | make_filename(fname, INDEX_RANDSEED, NULL); |
| 570 | /* |
| 571 | * Don't truncate the random seed file if it already exists; if |
| 572 | * something goes wrong half way through writing it, it would |
| 573 | * be better to leave the old data there than to leave it empty. |
| 574 | */ |
| 575 | fd = open(fname, O_CREAT | O_WRONLY, 0600); |
| 576 | if (fd < 0) { |
| 577 | char dir[FILENAME_MAX]; |
| 578 | |
| 579 | make_filename(dir, INDEX_DIR, NULL); |
| 580 | mkdir(dir, 0700); |
| 581 | fd = open(fname, O_CREAT | O_WRONLY, 0600); |
| 582 | } |
| 583 | |
| 584 | while (len > 0) { |
| 585 | int ret = write(fd, data, len); |
| 586 | if (ret <= 0) break; |
| 587 | len -= ret; |
| 588 | data = (char *)data + len; |
| 589 | } |
| 590 | |
| 591 | close(fd); |
| 592 | } |
| 593 | |
| 594 | void cleanup_all(void) |
| 595 | { |
| 596 | } |