3 * $Id: key-io.c,v 1.1 1999/12/22 15:47:48 mdw Exp $
5 * Adding new keys to a key file
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.1 1999/12/22 15:47:48 mdw
34 * Major key-management revision.
38 /*----- Header files ------------------------------------------------------*/
47 #include <mLib/alloc.h>
48 #include <mLib/bits.h>
49 #include <mLib/crc32.h>
50 #include <mLib/dstr.h>
51 #include <mLib/hash.h>
59 /*----- Tweakable macros --------------------------------------------------*/
61 #define KEY_LOAD(n) ((n) * 2)
63 /*----- Low-level functions -----------------------------------------------*/
67 * Arguments: @key_file *f@ = pointer to file structure
68 * @key *k@ = pointer to key block to insert
70 * Returns: Error code (one of the @KERR@ code).
72 * Use: Links a new key block into the complicated data structure
73 * which is a keyring file.
76 static int insert(key_file *f, key *k)
81 /* --- Sanity preservatives --- */
83 if (key_chkident(k->type))
84 return (KERR_BADTYPE);
85 else if (k->tag && key_chkident(k->tag))
88 /* --- Insert into the tag table --- */
91 kr = sym_find(&f->bytag, k->tag, -1, sizeof(*kr), &found);
97 /* --- Insert into the id table --- */
102 bin = HASH_BIN(&f->byid, k->id);
103 for (b = *bin; b; b = b->next) {
104 if (b->hash == k->id) {
106 sym_remove(&f->bytag, kr);
116 /* --- Extend the table --- */
120 else if (hash_extend(&f->byid))
121 f->idload = KEY_LOAD(f->byid.mask / 2);
123 /* --- Insert into the type table --- */
125 kr = sym_find(&f->bytype, k->type, -1, sizeof(*kr), &found);
131 if (k->exp != KEXP_FOREVER) {
132 while (*p && (*p)->exp != KEXP_EXPIRE && (*p)->exp > k->exp)
142 /*----- Reading and writing keys ------------------------------------------*/
144 /* --- @exptime@ --- *
146 * Arguments: @const char *p@ = pointer to string
148 * Returns: Time value.
150 * Use: Translates an expiry or deletion time.
153 time_t exptime(const char *p)
155 size_t sz = strlen(p);
156 if (strncmp(p, "expired", sz) == 0)
157 return (KEXP_EXPIRE);
158 else if (strncmp(p, "forever", sz) == 0)
159 return (KEXP_FOREVER);
164 /* --- @key_merge@ --- *
166 * Arguments: @key_file *f@ = pointer to file structure
167 * @const char *file@ = name of file (for error messages)
168 * @FILE *fp@ = file handle to read from
169 * @key_reporter *rep@ = error reporting function
170 * @void *arg@ = argument for function
172 * Returns: Error code (one of the @KERR@ constants).
174 * Use: Reads keys from a file, and inserts them into the file.
177 int key_merge(key_file *f, const char *file, FILE *fp,
178 key_reporter *rep, void *arg)
182 dstr n = DSTR_INIT, v = DSTR_INIT;
184 if (!(f->f & KF_WRITE))
185 return (KERR_READONLY);
187 for (; dstr_putline(&l, fp) != EOF; DRESET(&l)) {
192 /* --- Skip blank lines and comments --- *
194 * Quite what they're doing in what ought to be an automatically-
195 * maintained file I don't know.
199 while (isspace((unsigned char)*p))
201 if (!*p || *p == '#')
204 /* --- Break the line into fields --- *
206 * There are currently six fields of interest:
208 * * The key's identification (id, tag and type).
209 * * The actual key data itself.
210 * * The key expiry time.
211 * * The key deletion time.
212 * * The attributes field.
213 * * Any further comments.
215 * All but the last field can contain no spaces.
219 int n = str_split(p, vf, 5, &vf[5]);
222 rep(file, line, "too few fields", arg);
227 /* --- Allocate a new key block --- */
231 /* --- Extract the key data into the block --- */
233 if (key_read(vf[1], &k->k, 0)) {
235 rep(file, line, "bad key data", arg);
239 /* --- Decode the identification field --- *
241 * For compatibility, derive a keyid from the key data. This can only be
242 * done if the key encoding is binary (and presumably old-encoding binary
247 char *q = strchr(vf[0], ':');
251 if (k->k.e != KENC_BINARY) {
253 rep(file, line, "new-style key encoding but no keyid", arg);
256 k->id = crc32(0, k->k.u.k.k, k->k.u.k.sz);
257 k->type = xstrdup(vf[0]);
261 k->id = strtoul(p, 0, 16);
262 if ((qq = strchr(q, ':')) == 0 || !qq[1]) {
268 k->tag = xstrdup(qq);
270 k->type = xstrdup(q);
274 /* --- Get a key block for the new key --- */
276 k->exp = exptime(vf[2]);
277 k->del = exptime(vf[3]);
279 /* --- Insert the key block into the table --- */
285 if ((err = insert(f, k)) < 0) {
286 if (err == KERR_DUPTAG) {
288 rep(file, line, "duplicate key tag stripped", arg);
294 rep(file, line, key_strerror(err), arg);
299 /* --- Parse up the attributes, if specified --- */
302 if (vf[4] && strcmp(vf[4], "-") != 0) {
304 for (url_initdec(&uc, vf[4]); url_dec(&uc, &n, &v); ) {
305 key_putattr(f, k, n.buf, v.buf);
306 DRESET(&n); DRESET(&v);
310 /* --- Insert the comment --- */
313 k->c = xstrdup(vf[5]);
318 /* --- Tidy up after something going wrong --- */
331 /* --- Extensive tidying up now required --- */
340 /* --- @key_extract@ --- *
342 * Arguments: @key_file *f@ = pointer to file structure
343 * @key *k@ = key to extract
344 * @FILE *fp@ = file to write on
345 * @const key_filter *kf@ = pointer to key selection block
347 * Returns: Zero if OK, EOF on error.
349 * Use: Extracts a key to an ouptut file.
352 int key_extract(key_file *f, key *k, FILE *fp, const key_filter *kf)
357 /* --- Skip the key if it's deleted or unselected--- */
359 if (KEY_EXPIRED(t, k->del) || !key_match(&k->k, kf))
362 /* --- Encode the key and write the easy stuff --- */
366 key_write(&k->k, &d, kf);
371 /* --- Write out the expiry and deletion times --- */
373 if (KEY_EXPIRED(t, k->exp))
374 fputs("expired ", fp);
375 else if (k->exp == KEXP_FOREVER)
376 fputs("forever ", fp);
378 fprintf(fp, "%li ", (long)k->exp);
380 if (k->del == KEXP_FOREVER)
381 fputs("forever ", fp);
383 fprintf(fp, "%li ", (long)k->del);
385 /* --- Output the attributes --- */
394 for (sym_mkiter(&i, &k->a); (a = sym_next(&i)) != 0; ) {
396 url_enc(&uc, &d, SYM_NAME(a), a->p);
409 return (ferror(fp) ? EOF : 0);
412 /*----- Opening and closing files -----------------------------------------*/
414 /* --- @key_open@ --- *
416 * Arguments: @key_file *f@ = pointer to file structure to initialize
417 * @const char *file@ = pointer to the file name
418 * @int how@ = opening options (@KOPEN_*@).
419 * @key_reporter *rep@ = error reporting function
420 * @void *arg@ = argument for function
422 * Returns: Zero if it worked, nonzero otherwise.
424 * Use: Opens a key file, reads its contents, and stores them in a
425 * structure. The file is locked appropriately until closed
426 * using @key_close@. On an error, everything is cleared away
427 * tidily. If the file is opened with @KOPEN_WRITE@, it's
428 * created if necessary, with read and write permissions for its
432 int key_open(key_file *f, const char *file, int how,
433 key_reporter *rep, void *arg)
435 if (key_lockfile(f, file, how))
438 /* --- Trivial bits of initialization --- */
441 f->name = xstrdup(file);
443 /* --- Read the file of keys into the table --- */
445 hash_create(&f->byid, 16);
446 f->idload = KEY_LOAD(16);
447 sym_create(&f->bytype);
448 sym_create(&f->bytag);
450 key_merge(f, file, f->fp, rep, arg);
451 if (how == KOPEN_READ)
452 f->f &= ~(KF_WRITE | KF_MODIFIED);
454 f->f &= ~KF_MODIFIED;
456 /* --- Close the file if only needed for reading --- */
458 if (how == KOPEN_READ) {
466 /* --- @key_close@ --- *
468 * Arguments: @key_file *f@ = pointer to key file block
470 * Returns: A @KWRITE_@ code indicating how it went.
472 * Use: Frees all the key data, writes any changes. Make sure that
473 * all hell breaks loose if this returns @KWRITE_BROKEN@.
476 int key_close(key_file *f)
482 if ((e = key_save(f)) != KWRITE_OK)
485 /* --- Free all the individual keys --- */
487 for (hash_mkiter(&i, &f->byid); (b = hash_next(&i)) != 0; ) {
497 for (sym_mkiter(&j, &k->a); (a = sym_next(&j)) != 0; )
502 hash_destroy(&f->byid);
503 sym_destroy(&f->bytype);
504 sym_destroy(&f->bytag);
514 * Arguments: @key_file *f@ = pointer to key file
515 * @uint32 id@ = keyid to set
516 * @const char *type@ = the type of this key
517 * @time_t exp@ = when the key expires
518 * @int *err@ = where to store the error condition
520 * Returns: Key block containing new data, or null if it couldn't be
523 * Use: Attaches a new key to a key file. You must have a writable
524 * key file for this to work.
526 * The type is a key type string. This interface doesn't care
527 * about how type strings are formatted: it just treats them as
528 * opaque gobs of text. Clients are advised to choose some
529 * standard for representing key types, though.
531 * The expiry time should either be a time in the future, or the
532 * magic value @KEXP_FOREVER@ which means `never expire this
533 * key'. Be careful with `forever' keys. If I were you, I'd
534 * use a more sophisticated key management system than this for
537 * You have to set the actual key yourself.
540 key *key_new(key_file *f, uint32 id, const char *type, time_t exp, int *err)
546 /* --- Make sure the file is writable --- */
548 if (!(f->f & KF_WRITE))
550 else if (KEY_EXPIRED(t, exp))
552 else if (key_chkident(type))
558 k->type = xstrdup(type);
559 k->exp = k->del = exp;
563 if ((e = insert(f, k)) == 0)
574 /*----- That's all, folks -------------------------------------------------*/