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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: key-io.c,v 1.2 2000/02/12 18:21:02 mdw Exp $ |
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4 | * |
5 | * Adding new keys to a key file |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: key-io.c,v $ |
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33 | * Revision 1.2 2000/02/12 18:21:02 mdw |
34 | * Overhaul of key management (again). |
35 | * |
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36 | * Revision 1.1 1999/12/22 15:47:48 mdw |
37 | * Major key-management revision. |
38 | * |
39 | */ |
40 | |
41 | /*----- Header files ------------------------------------------------------*/ |
42 | |
43 | #include <ctype.h> |
44 | #include <errno.h> |
45 | #include <stdio.h> |
46 | #include <stdlib.h> |
47 | #include <string.h> |
48 | #include <time.h> |
49 | |
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50 | #include <mLib/bits.h> |
51 | #include <mLib/crc32.h> |
52 | #include <mLib/dstr.h> |
53 | #include <mLib/hash.h> |
54 | #include <mLib/str.h> |
55 | #include <mLib/sub.h> |
56 | #include <mLib/sym.h> |
57 | #include <mLib/url.h> |
58 | |
59 | #include "key.h" |
60 | |
61 | /*----- Tweakable macros --------------------------------------------------*/ |
62 | |
63 | #define KEY_LOAD(n) ((n) * 2) |
64 | |
65 | /*----- Low-level functions -----------------------------------------------*/ |
66 | |
67 | /* --- @insert@ --- * |
68 | * |
69 | * Arguments: @key_file *f@ = pointer to file structure |
70 | * @key *k@ = pointer to key block to insert |
71 | * |
72 | * Returns: Error code (one of the @KERR@ code). |
73 | * |
74 | * Use: Links a new key block into the complicated data structure |
75 | * which is a keyring file. |
76 | */ |
77 | |
78 | static int insert(key_file *f, key *k) |
79 | { |
80 | key_ref *kr = 0; |
81 | unsigned found; |
82 | |
83 | /* --- Sanity preservatives --- */ |
84 | |
85 | if (key_chkident(k->type)) |
86 | return (KERR_BADTYPE); |
87 | else if (k->tag && key_chkident(k->tag)) |
88 | return (KERR_BADTAG); |
89 | |
90 | /* --- Insert into the tag table --- */ |
91 | |
92 | if (k->tag) { |
93 | kr = sym_find(&f->bytag, k->tag, -1, sizeof(*kr), &found); |
94 | if (found) |
95 | return (KERR_DUPTAG); |
96 | kr->k = k; |
97 | } |
98 | |
99 | /* --- Insert into the id table --- */ |
100 | |
101 | { |
102 | hash_base **bin, *b; |
103 | |
104 | bin = HASH_BIN(&f->byid, k->id); |
105 | for (b = *bin; b; b = b->next) { |
106 | if (b->hash == k->id) { |
107 | if (kr) |
108 | sym_remove(&f->bytag, kr); |
109 | return (KERR_DUPID); |
110 | } |
111 | } |
112 | |
113 | k->_b.next = *bin; |
114 | *bin = &k->_b; |
115 | k->_b.hash = k->id; |
116 | } |
117 | |
118 | /* --- Extend the table --- */ |
119 | |
120 | if (f->idload > 0) |
121 | f->idload--; |
122 | else if (hash_extend(&f->byid)) |
123 | f->idload = KEY_LOAD(f->byid.mask / 2); |
124 | |
125 | /* --- Insert into the type table --- */ |
126 | |
127 | kr = sym_find(&f->bytype, k->type, -1, sizeof(*kr), &found); |
128 | if (!found) { |
129 | kr->k = k; |
130 | k->next = 0; |
131 | } else { |
132 | key **p = &kr->k; |
133 | if (k->exp != KEXP_FOREVER) { |
134 | while (*p && (*p)->exp != KEXP_EXPIRE && (*p)->exp > k->exp) |
135 | p = &(*p)->next; |
136 | } |
137 | k->next = *p; |
138 | *p = k; |
139 | } |
140 | |
141 | return (KERR_OK); |
142 | } |
143 | |
144 | /*----- Reading and writing keys ------------------------------------------*/ |
145 | |
146 | /* --- @exptime@ --- * |
147 | * |
148 | * Arguments: @const char *p@ = pointer to string |
149 | * |
150 | * Returns: Time value. |
151 | * |
152 | * Use: Translates an expiry or deletion time. |
153 | */ |
154 | |
155 | time_t exptime(const char *p) |
156 | { |
157 | size_t sz = strlen(p); |
158 | if (strncmp(p, "expired", sz) == 0) |
159 | return (KEXP_EXPIRE); |
160 | else if (strncmp(p, "forever", sz) == 0) |
161 | return (KEXP_FOREVER); |
162 | else |
163 | return (atol(p)); |
164 | } |
165 | |
166 | /* --- @key_merge@ --- * |
167 | * |
168 | * Arguments: @key_file *f@ = pointer to file structure |
169 | * @const char *file@ = name of file (for error messages) |
170 | * @FILE *fp@ = file handle to read from |
171 | * @key_reporter *rep@ = error reporting function |
172 | * @void *arg@ = argument for function |
173 | * |
174 | * Returns: Error code (one of the @KERR@ constants). |
175 | * |
176 | * Use: Reads keys from a file, and inserts them into the file. |
177 | */ |
178 | |
179 | int key_merge(key_file *f, const char *file, FILE *fp, |
180 | key_reporter *rep, void *arg) |
181 | { |
182 | int line = 0; |
183 | dstr l = DSTR_INIT; |
184 | dstr n = DSTR_INIT, v = DSTR_INIT; |
185 | |
186 | if (!(f->f & KF_WRITE)) |
187 | return (KERR_READONLY); |
188 | |
189 | for (; dstr_putline(&l, fp) != EOF; DRESET(&l)) { |
190 | char *vf[6]; |
191 | char *p = l.buf; |
192 | key *k; |
193 | |
194 | /* --- Skip blank lines and comments --- * |
195 | * |
196 | * Quite what they're doing in what ought to be an automatically- |
197 | * maintained file I don't know. |
198 | */ |
199 | |
200 | line++; |
201 | while (isspace((unsigned char)*p)) |
202 | p++; |
203 | if (!*p || *p == '#') |
204 | continue; |
205 | |
206 | /* --- Break the line into fields --- * |
207 | * |
208 | * There are currently six fields of interest: |
209 | * |
210 | * * The key's identification (id, tag and type). |
211 | * * The actual key data itself. |
212 | * * The key expiry time. |
213 | * * The key deletion time. |
214 | * * The attributes field. |
215 | * * Any further comments. |
216 | * |
217 | * All but the last field can contain no spaces. |
218 | */ |
219 | |
220 | { |
221 | int n = str_split(p, vf, 5, &vf[5]); |
222 | if (n < 4) { |
223 | if (rep) |
224 | rep(file, line, "too few fields", arg); |
225 | goto skip_0; |
226 | } |
227 | } |
228 | |
229 | /* --- Allocate a new key block --- */ |
230 | |
231 | k = CREATE(key); |
232 | |
233 | /* --- Extract the key data into the block --- */ |
234 | |
235 | if (key_read(vf[1], &k->k, 0)) { |
236 | if (rep) |
237 | rep(file, line, "bad key data", arg); |
238 | goto skip_1; |
239 | } |
240 | |
241 | /* --- Decode the identification field --- * |
242 | * |
243 | * For compatibility, derive a keyid from the key data. This can only be |
244 | * done if the key encoding is binary (and presumably old-encoding binary |
245 | * at that). |
246 | */ |
247 | |
248 | { |
249 | char *q = strchr(vf[0], ':'); |
250 | char *qq; |
251 | |
252 | if (!q) { |
253 | if (k->k.e != KENC_BINARY) { |
254 | if (rep) |
255 | rep(file, line, "new-style key encoding but no keyid", arg); |
256 | goto skip_2; |
257 | } |
258 | k->id = crc32(0, k->k.u.k.k, k->k.u.k.sz); |
259 | k->type = xstrdup(vf[0]); |
260 | k->tag = 0; |
261 | } else { |
262 | *q++ = 0; |
263 | k->id = strtoul(p, 0, 16); |
264 | if ((qq = strchr(q, ':')) == 0 || !qq[1]) { |
265 | if (qq) |
266 | *qq = 0; |
267 | k->tag = 0; |
268 | } else { |
269 | *qq++ = 0; |
270 | k->tag = xstrdup(qq); |
271 | } |
272 | k->type = xstrdup(q); |
273 | } |
274 | } |
275 | |
276 | /* --- Get a key block for the new key --- */ |
277 | |
278 | k->exp = exptime(vf[2]); |
279 | k->del = exptime(vf[3]); |
280 | |
281 | /* --- Insert the key block into the table --- */ |
282 | |
283 | { |
284 | int err; |
285 | |
286 | again: |
287 | if ((err = insert(f, k)) < 0) { |
288 | if (err == KERR_DUPTAG) { |
289 | if (rep) |
290 | rep(file, line, "duplicate key tag stripped", arg); |
291 | free(k->tag); |
292 | k->tag = 0; |
293 | goto again; |
294 | } |
295 | if (rep) |
296 | rep(file, line, key_strerror(err), arg); |
297 | goto skip_3; |
298 | } |
299 | } |
300 | |
301 | /* --- Parse up the attributes, if specified --- */ |
302 | |
303 | sym_create(&k->a); |
304 | if (vf[4] && strcmp(vf[4], "-") != 0) { |
305 | url_dctx uc; |
306 | for (url_initdec(&uc, vf[4]); url_dec(&uc, &n, &v); ) { |
307 | key_putattr(f, k, n.buf, v.buf); |
308 | DRESET(&n); DRESET(&v); |
309 | } |
310 | } |
311 | |
312 | /* --- Insert the comment --- */ |
313 | |
314 | if (vf[5]) |
315 | k->c = xstrdup(vf[5]); |
316 | else |
317 | k->c = 0; |
318 | continue; |
319 | |
320 | /* --- Tidy up after something going wrong --- */ |
321 | |
322 | skip_3: |
323 | if (k->tag) |
324 | free(k->tag); |
325 | free(k->type); |
326 | skip_2: |
327 | key_destroy(&k->k); |
328 | skip_1: |
329 | DESTROY(k); |
330 | skip_0:; |
331 | } |
332 | |
333 | /* --- Extensive tidying up now required --- */ |
334 | |
335 | dstr_destroy(&l); |
336 | dstr_destroy(&n); |
337 | dstr_destroy(&v); |
338 | f->f |= KF_MODIFIED; |
339 | return (0); |
340 | } |
341 | |
342 | /* --- @key_extract@ --- * |
343 | * |
344 | * Arguments: @key_file *f@ = pointer to file structure |
345 | * @key *k@ = key to extract |
346 | * @FILE *fp@ = file to write on |
347 | * @const key_filter *kf@ = pointer to key selection block |
348 | * |
349 | * Returns: Zero if OK, EOF on error. |
350 | * |
351 | * Use: Extracts a key to an ouptut file. |
352 | */ |
353 | |
354 | int key_extract(key_file *f, key *k, FILE *fp, const key_filter *kf) |
355 | { |
356 | dstr d = DSTR_INIT; |
357 | time_t t = time(0); |
358 | |
359 | /* --- Skip the key if it's deleted or unselected--- */ |
360 | |
361 | if (KEY_EXPIRED(t, k->del) || !key_match(&k->k, kf)) |
362 | return (0); |
363 | |
364 | /* --- Encode the key and write the easy stuff --- */ |
365 | |
366 | key_fulltag(k, &d); |
367 | DPUTC(&d, ' '); |
368 | key_write(&k->k, &d, kf); |
369 | DPUTC(&d, ' '); |
370 | dstr_write(&d, fp); |
371 | DRESET(&d); |
372 | |
373 | /* --- Write out the expiry and deletion times --- */ |
374 | |
375 | if (KEY_EXPIRED(t, k->exp)) |
376 | fputs("expired ", fp); |
377 | else if (k->exp == KEXP_FOREVER) |
378 | fputs("forever ", fp); |
379 | else |
380 | fprintf(fp, "%li ", (long)k->exp); |
381 | |
382 | if (k->del == KEXP_FOREVER) |
383 | fputs("forever ", fp); |
384 | else |
385 | fprintf(fp, "%li ", (long)k->del); |
386 | |
387 | /* --- Output the attributes --- */ |
388 | |
389 | { |
390 | int none = 1; |
391 | sym_iter i; |
392 | key_attr *a; |
393 | url_ectx uc; |
394 | |
395 | url_initenc(&uc); |
396 | for (sym_mkiter(&i, &k->a); (a = sym_next(&i)) != 0; ) { |
397 | none = 0; |
398 | url_enc(&uc, &d, SYM_NAME(a), a->p); |
399 | } |
400 | if (none) |
401 | DPUTS(&d, "-"); |
402 | DWRITE(&d, fp); |
403 | } |
404 | |
405 | dstr_destroy(&d); |
406 | if (k->c) { |
407 | putc(' ', fp); |
408 | fputs(k->c, fp); |
409 | } |
410 | putc('\n', fp); |
411 | return (ferror(fp) ? EOF : 0); |
412 | } |
413 | |
414 | /*----- Opening and closing files -----------------------------------------*/ |
415 | |
416 | /* --- @key_open@ --- * |
417 | * |
418 | * Arguments: @key_file *f@ = pointer to file structure to initialize |
419 | * @const char *file@ = pointer to the file name |
420 | * @int how@ = opening options (@KOPEN_*@). |
421 | * @key_reporter *rep@ = error reporting function |
422 | * @void *arg@ = argument for function |
423 | * |
424 | * Returns: Zero if it worked, nonzero otherwise. |
425 | * |
426 | * Use: Opens a key file, reads its contents, and stores them in a |
427 | * structure. The file is locked appropriately until closed |
428 | * using @key_close@. On an error, everything is cleared away |
429 | * tidily. If the file is opened with @KOPEN_WRITE@, it's |
430 | * created if necessary, with read and write permissions for its |
431 | * owner only. |
432 | */ |
433 | |
434 | int key_open(key_file *f, const char *file, int how, |
435 | key_reporter *rep, void *arg) |
436 | { |
437 | if (key_lockfile(f, file, how)) |
438 | return (-1); |
439 | |
440 | /* --- Trivial bits of initialization --- */ |
441 | |
442 | f->f = 0; |
443 | f->name = xstrdup(file); |
444 | |
445 | /* --- Read the file of keys into the table --- */ |
446 | |
447 | hash_create(&f->byid, 16); |
448 | f->idload = KEY_LOAD(16); |
449 | sym_create(&f->bytype); |
450 | sym_create(&f->bytag); |
451 | f->f |= KF_WRITE; |
452 | key_merge(f, file, f->fp, rep, arg); |
453 | if (how == KOPEN_READ) |
454 | f->f &= ~(KF_WRITE | KF_MODIFIED); |
455 | else |
456 | f->f &= ~KF_MODIFIED; |
457 | |
458 | /* --- Close the file if only needed for reading --- */ |
459 | |
460 | if (how == KOPEN_READ) { |
461 | fclose(f->fp); |
462 | f->fp = 0; |
463 | } |
464 | |
465 | return (0); |
466 | } |
467 | |
468 | /* --- @key_close@ --- * |
469 | * |
470 | * Arguments: @key_file *f@ = pointer to key file block |
471 | * |
472 | * Returns: A @KWRITE_@ code indicating how it went. |
473 | * |
474 | * Use: Frees all the key data, writes any changes. Make sure that |
475 | * all hell breaks loose if this returns @KWRITE_BROKEN@. |
476 | */ |
477 | |
478 | int key_close(key_file *f) |
479 | { |
480 | int e; |
481 | hash_base *b; |
482 | hash_iter i; |
483 | |
484 | if ((e = key_save(f)) != KWRITE_OK) |
485 | return (e); |
486 | |
487 | /* --- Free all the individual keys --- */ |
488 | |
489 | for (hash_mkiter(&i, &f->byid); (b = hash_next(&i)) != 0; ) { |
490 | sym_iter j; |
491 | key_attr *a; |
492 | key *k = (key *)b; |
493 | |
494 | key_destroy(&k->k); |
495 | free(k->type); |
496 | free(k->tag); |
497 | if (k->c) |
498 | free(k->c); |
499 | for (sym_mkiter(&j, &k->a); (a = sym_next(&j)) != 0; ) |
500 | free(a->p); |
501 | sym_destroy(&k->a); |
502 | DESTROY(k); |
503 | } |
504 | hash_destroy(&f->byid); |
505 | sym_destroy(&f->bytype); |
506 | sym_destroy(&f->bytag); |
507 | |
508 | if (f->fp) |
509 | fclose(f->fp); |
510 | free(f->name); |
511 | return (KWRITE_OK); |
512 | } |
513 | |
514 | /* --- @key_new@ --- |
515 | * |
516 | * Arguments: @key_file *f@ = pointer to key file |
517 | * @uint32 id@ = keyid to set |
518 | * @const char *type@ = the type of this key |
519 | * @time_t exp@ = when the key expires |
520 | * @int *err@ = where to store the error condition |
521 | * |
522 | * Returns: Key block containing new data, or null if it couldn't be |
523 | * done. |
524 | * |
525 | * Use: Attaches a new key to a key file. You must have a writable |
526 | * key file for this to work. |
527 | * |
528 | * The type is a key type string. This interface doesn't care |
529 | * about how type strings are formatted: it just treats them as |
530 | * opaque gobs of text. Clients are advised to choose some |
531 | * standard for representing key types, though. |
532 | * |
533 | * The expiry time should either be a time in the future, or the |
534 | * magic value @KEXP_FOREVER@ which means `never expire this |
535 | * key'. Be careful with `forever' keys. If I were you, I'd |
536 | * use a more sophisticated key management system than this for |
537 | * them. |
538 | * |
539 | * You have to set the actual key yourself. |
540 | */ |
541 | |
542 | key *key_new(key_file *f, uint32 id, const char *type, time_t exp, int *err) |
543 | { |
544 | key *k = 0; |
545 | time_t t = time(0); |
546 | int e = KERR_OK; |
547 | |
548 | /* --- Make sure the file is writable --- */ |
549 | |
550 | if (!(f->f & KF_WRITE)) |
551 | e = KERR_READONLY; |
552 | else if (KEY_EXPIRED(t, exp)) |
553 | e = KERR_EXPIRED; |
554 | else if (key_chkident(type)) |
555 | e = KERR_BADTYPE; |
556 | else { |
557 | k = CREATE(key); |
558 | k->id = id; |
559 | k->tag = 0; |
560 | k->type = xstrdup(type); |
561 | k->exp = k->del = exp; |
562 | k->c = 0; |
563 | k->k.e = 0; |
564 | sym_create(&k->a); |
565 | if ((e = insert(f, k)) == 0) |
566 | f->f |= KF_MODIFIED; |
567 | else { |
568 | free(k->type); |
569 | DESTROY(k); |
570 | k = 0; |
571 | } |
572 | } |
573 | return (k); |
574 | } |
575 | |
576 | /*----- That's all, folks -------------------------------------------------*/ |