1709795f |
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> |
3f935d5b |
8 | #include <string.h> |
8dacc30e |
9 | #include <assert.h> |
3f935d5b |
10 | #include <errno.h> |
0ac15bdc |
11 | #include <ctype.h> |
c5e438ec |
12 | #include <unistd.h> |
13 | #include <fcntl.h> |
8dacc30e |
14 | #include <dirent.h> |
c5e438ec |
15 | #include <sys/stat.h> |
16 | #include <sys/types.h> |
1709795f |
17 | #include "putty.h" |
18 | #include "storage.h" |
0ac15bdc |
19 | #include "tree234.h" |
1709795f |
20 | |
8dacc30e |
21 | enum { |
be57bcef |
22 | INDEX_DIR, INDEX_HOSTKEYS, INDEX_HOSTKEYS_TMP, INDEX_RANDSEED, |
8dacc30e |
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 | |
797f6ff3 |
32 | if (!in || !*in) |
8dacc30e |
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" : |
be57bcef |
101 | index == INDEX_HOSTKEYS_TMP ? "/.putty/sshhostkeys.tmp" : |
8dacc30e |
102 | index == INDEX_RANDSEED ? "/.putty/randomseed" : |
103 | "/.putty/ERROR", FILENAME_MAX - len); |
104 | } |
105 | filename[FILENAME_MAX-1] = '\0'; |
106 | } |
107 | |
3f935d5b |
108 | void *open_settings_w(const char *sessionname, char **errmsg) |
1709795f |
109 | { |
8dacc30e |
110 | char filename[FILENAME_MAX]; |
111 | FILE *fp; |
112 | |
3f935d5b |
113 | *errmsg = NULL; |
114 | |
8dacc30e |
115 | /* |
3f935d5b |
116 | * Start by making sure the .putty directory and its sessions |
117 | * subdir actually exist. Ignore error returns from mkdir since |
118 | * they're perfectly likely to be `already exists', and any |
119 | * other error will trip us up later on so there's no real need |
120 | * to catch it now. |
8dacc30e |
121 | */ |
3f935d5b |
122 | make_filename(filename, INDEX_DIR, sessionname); |
123 | mkdir(filename, 0700); |
8dacc30e |
124 | make_filename(filename, INDEX_SESSIONDIR, sessionname); |
125 | mkdir(filename, 0700); |
126 | |
127 | make_filename(filename, INDEX_SESSION, sessionname); |
128 | fp = fopen(filename, "w"); |
3f935d5b |
129 | if (!fp) { |
130 | *errmsg = dupprintf("Unable to create %s: %s", |
131 | filename, strerror(errno)); |
132 | return NULL; /* can't open */ |
133 | } |
8dacc30e |
134 | return fp; |
1709795f |
135 | } |
136 | |
c85623f9 |
137 | void write_setting_s(void *handle, const char *key, const char *value) |
1709795f |
138 | { |
8dacc30e |
139 | FILE *fp = (FILE *)handle; |
140 | fprintf(fp, "%s=%s\n", key, value); |
1709795f |
141 | } |
142 | |
c85623f9 |
143 | void write_setting_i(void *handle, const char *key, int value) |
1709795f |
144 | { |
8dacc30e |
145 | FILE *fp = (FILE *)handle; |
146 | fprintf(fp, "%s=%d\n", key, value); |
1709795f |
147 | } |
148 | |
149 | void close_settings_w(void *handle) |
150 | { |
8dacc30e |
151 | FILE *fp = (FILE *)handle; |
152 | fclose(fp); |
1709795f |
153 | } |
154 | |
faec60ed |
155 | /* |
156 | * Reading settings, for the moment, is done by retrieving X |
157 | * resources from the X display. When we introduce disk files, I |
158 | * think what will happen is that the X resources will override |
159 | * PuTTY's inbuilt defaults, but that the disk files will then |
160 | * override those. This isn't optimal, but it's the best I can |
161 | * immediately work out. |
e50f98bc |
162 | * FIXME: the above comment is a bit out of date. Did it happen? |
faec60ed |
163 | */ |
164 | |
8dacc30e |
165 | struct keyval { |
c85623f9 |
166 | const char *key; |
167 | const char *value; |
0ac15bdc |
168 | }; |
169 | |
170 | static tree234 *xrmtree = NULL; |
171 | |
8dacc30e |
172 | int keycmp(void *av, void *bv) |
0ac15bdc |
173 | { |
8dacc30e |
174 | struct keyval *a = (struct keyval *)av; |
175 | struct keyval *b = (struct keyval *)bv; |
0ac15bdc |
176 | return strcmp(a->key, b->key); |
177 | } |
178 | |
179 | void provide_xrm_string(char *string) |
180 | { |
c85623f9 |
181 | char *p, *q, *key; |
8dacc30e |
182 | struct keyval *xrms, *ret; |
0ac15bdc |
183 | |
184 | p = q = strchr(string, ':'); |
185 | if (!q) { |
186 | fprintf(stderr, "pterm: expected a colon in resource string" |
187 | " \"%s\"\n", string); |
188 | return; |
189 | } |
190 | q++; |
191 | while (p > string && p[-1] != '.' && p[-1] != '*') |
192 | p--; |
8dacc30e |
193 | xrms = snew(struct keyval); |
3d88e64d |
194 | key = snewn(q-p, char); |
c85623f9 |
195 | memcpy(key, p, q-p); |
196 | key[q-p-1] = '\0'; |
197 | xrms->key = key; |
e93ed432 |
198 | while (*q && isspace((unsigned char)*q)) |
0ac15bdc |
199 | q++; |
200 | xrms->value = dupstr(q); |
201 | |
202 | if (!xrmtree) |
8dacc30e |
203 | xrmtree = newtree234(keycmp); |
0ac15bdc |
204 | |
205 | ret = add234(xrmtree, xrms); |
206 | if (ret) { |
207 | /* Override an existing string. */ |
208 | del234(xrmtree, ret); |
209 | add234(xrmtree, xrms); |
210 | } |
211 | } |
212 | |
c85623f9 |
213 | const char *get_setting(const char *key) |
0ac15bdc |
214 | { |
8dacc30e |
215 | struct keyval tmp, *ret; |
0ac15bdc |
216 | tmp.key = key; |
217 | if (xrmtree) { |
218 | ret = find234(xrmtree, &tmp, NULL); |
219 | if (ret) |
220 | return ret->value; |
221 | } |
c5e438ec |
222 | return x_get_default(key); |
0ac15bdc |
223 | } |
224 | |
c85623f9 |
225 | void *open_settings_r(const char *sessionname) |
1709795f |
226 | { |
8dacc30e |
227 | char filename[FILENAME_MAX]; |
228 | FILE *fp; |
229 | char *line; |
230 | tree234 *ret; |
231 | |
232 | make_filename(filename, INDEX_SESSION, sessionname); |
233 | fp = fopen(filename, "r"); |
234 | if (!fp) |
235 | return NULL; /* can't open */ |
236 | |
237 | ret = newtree234(keycmp); |
238 | |
239 | while ( (line = fgetline(fp)) ) { |
240 | char *value = strchr(line, '='); |
241 | struct keyval *kv; |
242 | |
243 | if (!value) |
244 | continue; |
245 | *value++ = '\0'; |
246 | value[strcspn(value, "\r\n")] = '\0'; /* trim trailing NL */ |
247 | |
248 | kv = snew(struct keyval); |
249 | kv->key = dupstr(line); |
250 | kv->value = dupstr(value); |
251 | add234(ret, kv); |
252 | |
253 | sfree(line); |
254 | } |
255 | |
256 | fclose(fp); |
257 | |
258 | return ret; |
1709795f |
259 | } |
260 | |
c85623f9 |
261 | char *read_setting_s(void *handle, const char *key, char *buffer, int buflen) |
1709795f |
262 | { |
8dacc30e |
263 | tree234 *tree = (tree234 *)handle; |
264 | const char *val; |
265 | struct keyval tmp, *kv; |
266 | |
267 | tmp.key = key; |
268 | if (tree != NULL && |
269 | (kv = find234(tree, &tmp, NULL)) != NULL) { |
270 | val = kv->value; |
271 | assert(val != NULL); |
272 | } else |
273 | val = get_setting(key); |
274 | |
faec60ed |
275 | if (!val) |
276 | return NULL; |
277 | else { |
278 | strncpy(buffer, val, buflen); |
279 | buffer[buflen-1] = '\0'; |
280 | return buffer; |
281 | } |
1709795f |
282 | } |
283 | |
c85623f9 |
284 | int read_setting_i(void *handle, const char *key, int defvalue) |
1709795f |
285 | { |
8dacc30e |
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 | |
faec60ed |
298 | if (!val) |
299 | return defvalue; |
300 | else |
301 | return atoi(val); |
1709795f |
302 | } |
303 | |
9a30e26b |
304 | int read_setting_fontspec(void *handle, const char *name, FontSpec *result) |
305 | { |
306 | return !!read_setting_s(handle, name, result->name, sizeof(result->name)); |
307 | } |
308 | int read_setting_filename(void *handle, const char *name, Filename *result) |
309 | { |
310 | return !!read_setting_s(handle, name, result->path, sizeof(result->path)); |
311 | } |
312 | |
313 | void write_setting_fontspec(void *handle, const char *name, FontSpec result) |
314 | { |
315 | write_setting_s(handle, name, result.name); |
316 | } |
317 | void write_setting_filename(void *handle, const char *name, Filename result) |
318 | { |
319 | write_setting_s(handle, name, result.path); |
320 | } |
321 | |
1709795f |
322 | void close_settings_r(void *handle) |
323 | { |
8dacc30e |
324 | tree234 *tree = (tree234 *)handle; |
325 | struct keyval *kv; |
326 | |
327 | if (!tree) |
328 | return; |
329 | |
330 | while ( (kv = index234(tree, 0)) != NULL) { |
331 | del234(tree, kv); |
332 | sfree((char *)kv->key); |
333 | sfree((char *)kv->value); |
334 | sfree(kv); |
335 | } |
336 | |
337 | freetree234(tree); |
1709795f |
338 | } |
339 | |
c85623f9 |
340 | void del_settings(const char *sessionname) |
1709795f |
341 | { |
8dacc30e |
342 | char filename[FILENAME_MAX]; |
343 | make_filename(filename, INDEX_SESSION, sessionname); |
344 | unlink(filename); |
1709795f |
345 | } |
346 | |
347 | void *enum_settings_start(void) |
348 | { |
8dacc30e |
349 | DIR *dp; |
350 | char filename[FILENAME_MAX]; |
1709795f |
351 | |
8dacc30e |
352 | make_filename(filename, INDEX_SESSIONDIR, NULL); |
353 | dp = opendir(filename); |
1709795f |
354 | |
8dacc30e |
355 | return dp; |
1709795f |
356 | } |
357 | |
8dacc30e |
358 | char *enum_settings_next(void *handle, char *buffer, int buflen) |
c5e438ec |
359 | { |
8dacc30e |
360 | DIR *dp = (DIR *)handle; |
361 | struct dirent *de; |
362 | struct stat st; |
363 | char fullpath[FILENAME_MAX]; |
c5e438ec |
364 | int len; |
8dacc30e |
365 | char *unmunged; |
366 | |
367 | make_filename(fullpath, INDEX_SESSIONDIR, NULL); |
368 | len = strlen(fullpath); |
369 | |
370 | while ( (de = readdir(dp)) != NULL ) { |
371 | if (len < FILENAME_MAX) { |
372 | fullpath[len] = '/'; |
373 | strncpy(fullpath+len+1, de->d_name, FILENAME_MAX-(len+1)); |
374 | fullpath[FILENAME_MAX-1] = '\0'; |
375 | } |
376 | |
377 | if (stat(fullpath, &st) < 0 || !S_ISREG(st.st_mode)) |
378 | continue; /* try another one */ |
379 | |
380 | unmunged = unmungestr(de->d_name); |
381 | strncpy(buffer, unmunged, buflen); |
382 | buffer[buflen-1] = '\0'; |
383 | sfree(unmunged); |
384 | return buffer; |
385 | } |
386 | |
387 | return NULL; |
c5e438ec |
388 | } |
389 | |
8dacc30e |
390 | void enum_settings_finish(void *handle) |
c5e438ec |
391 | { |
8dacc30e |
392 | DIR *dp = (DIR *)handle; |
393 | closedir(dp); |
c5e438ec |
394 | } |
395 | |
396 | /* |
397 | * Lines in the host keys file are of the form |
398 | * |
399 | * type@port:hostname keydata |
400 | * |
401 | * e.g. |
402 | * |
403 | * rsa@22:foovax.example.org 0x23,0x293487364395345345....2343 |
404 | */ |
c85623f9 |
405 | int verify_host_key(const char *hostname, int port, |
406 | const char *keytype, const char *key) |
1709795f |
407 | { |
c5e438ec |
408 | FILE *fp; |
409 | char filename[FILENAME_MAX]; |
410 | char *line; |
411 | int ret; |
412 | |
8dacc30e |
413 | make_filename(filename, INDEX_HOSTKEYS, NULL); |
c5e438ec |
414 | fp = fopen(filename, "r"); |
415 | if (!fp) |
416 | return 1; /* key does not exist */ |
417 | |
418 | ret = 1; |
419 | while ( (line = fgetline(fp)) ) { |
420 | int i; |
421 | char *p = line; |
422 | char porttext[20]; |
423 | |
424 | line[strcspn(line, "\n")] = '\0'; /* strip trailing newline */ |
425 | |
426 | i = strlen(keytype); |
427 | if (strncmp(p, keytype, i)) |
428 | goto done; |
429 | p += i; |
430 | |
431 | if (*p != '@') |
432 | goto done; |
433 | p++; |
434 | |
435 | sprintf(porttext, "%d", port); |
436 | i = strlen(porttext); |
437 | if (strncmp(p, porttext, i)) |
438 | goto done; |
439 | p += i; |
440 | |
441 | if (*p != ':') |
442 | goto done; |
443 | p++; |
444 | |
445 | i = strlen(hostname); |
446 | if (strncmp(p, hostname, i)) |
447 | goto done; |
448 | p += i; |
449 | |
450 | if (*p != ' ') |
451 | goto done; |
452 | p++; |
453 | |
454 | /* |
455 | * Found the key. Now just work out whether it's the right |
456 | * one or not. |
457 | */ |
458 | if (!strcmp(p, key)) |
459 | ret = 0; /* key matched OK */ |
460 | else |
461 | ret = 2; /* key mismatch */ |
462 | |
463 | done: |
464 | sfree(line); |
465 | if (ret != 1) |
466 | break; |
467 | } |
468 | |
1957695c |
469 | fclose(fp); |
c5e438ec |
470 | return ret; |
1709795f |
471 | } |
472 | |
c85623f9 |
473 | void store_host_key(const char *hostname, int port, |
474 | const char *keytype, const char *key) |
1709795f |
475 | { |
be57bcef |
476 | FILE *rfp, *wfp; |
477 | char *newtext, *line; |
478 | int headerlen; |
479 | char filename[FILENAME_MAX], tmpfilename[FILENAME_MAX]; |
c5e438ec |
480 | |
be57bcef |
481 | newtext = dupprintf("%s@%d:%s %s\n", keytype, port, hostname, key); |
482 | headerlen = 1 + strcspn(newtext, " "); /* count the space too */ |
c5e438ec |
483 | |
be57bcef |
484 | /* |
485 | * Open both the old file and a new file. |
486 | */ |
be57bcef |
487 | make_filename(tmpfilename, INDEX_HOSTKEYS_TMP, NULL); |
488 | wfp = fopen(tmpfilename, "w"); |
489 | if (!wfp) { |
11cd814b |
490 | char dir[FILENAME_MAX]; |
491 | |
492 | make_filename(dir, INDEX_DIR, NULL); |
493 | mkdir(dir, 0700); |
494 | wfp = fopen(tmpfilename, "w"); |
c5e438ec |
495 | } |
11cd814b |
496 | if (!wfp) |
497 | return; |
498 | make_filename(filename, INDEX_HOSTKEYS, NULL); |
499 | rfp = fopen(filename, "r"); |
be57bcef |
500 | |
501 | /* |
502 | * Copy all lines from the old file to the new one that _don't_ |
503 | * involve the same host key identifier as the one we're adding. |
504 | */ |
11cd814b |
505 | if (rfp) { |
506 | while ( (line = fgetline(rfp)) ) { |
507 | if (strncmp(line, newtext, headerlen)) |
508 | fputs(line, wfp); |
509 | } |
510 | fclose(rfp); |
c5e438ec |
511 | } |
be57bcef |
512 | |
513 | /* |
514 | * Now add the new line at the end. |
515 | */ |
516 | fputs(newtext, wfp); |
517 | |
be57bcef |
518 | fclose(wfp); |
519 | |
520 | rename(tmpfilename, filename); |
521 | |
522 | sfree(newtext); |
1709795f |
523 | } |
524 | |
525 | void read_random_seed(noise_consumer_t consumer) |
526 | { |
d9c40fd6 |
527 | int fd; |
528 | char fname[FILENAME_MAX]; |
529 | |
8dacc30e |
530 | make_filename(fname, INDEX_RANDSEED, NULL); |
d9c40fd6 |
531 | fd = open(fname, O_RDONLY); |
532 | if (fd) { |
533 | char buf[512]; |
534 | int ret; |
535 | while ( (ret = read(fd, buf, sizeof(buf))) > 0) |
536 | consumer(buf, ret); |
537 | close(fd); |
538 | } |
1709795f |
539 | } |
540 | |
541 | void write_random_seed(void *data, int len) |
542 | { |
d9c40fd6 |
543 | int fd; |
544 | char fname[FILENAME_MAX]; |
545 | |
8dacc30e |
546 | make_filename(fname, INDEX_RANDSEED, NULL); |
e3ac3c05 |
547 | /* |
548 | * Don't truncate the random seed file if it already exists; if |
549 | * something goes wrong half way through writing it, it would |
550 | * be better to leave the old data there than to leave it empty. |
551 | */ |
552 | fd = open(fname, O_CREAT | O_WRONLY, 0600); |
d9c40fd6 |
553 | if (fd < 0) { |
554 | char dir[FILENAME_MAX]; |
555 | |
8dacc30e |
556 | make_filename(dir, INDEX_DIR, NULL); |
d9c40fd6 |
557 | mkdir(dir, 0700); |
e3ac3c05 |
558 | fd = open(fname, O_CREAT | O_WRONLY, 0600); |
d9c40fd6 |
559 | } |
560 | |
561 | while (len > 0) { |
562 | int ret = write(fd, data, len); |
563 | if (ret <= 0) break; |
564 | len -= ret; |
565 | data = (char *)data + len; |
566 | } |
567 | |
568 | close(fd); |
1709795f |
569 | } |
570 | |
571 | void cleanup_all(void) |
572 | { |
573 | } |