Commit | Line | Data |
---|---|---|
410c8acf | 1 | /* -*-c-*- |
2 | * | |
410c8acf | 3 | * Key loading and storing |
4 | * | |
5 | * (c) 2001 Straylight/Edgeware | |
6 | */ | |
7 | ||
e04c2d50 | 8 | /*----- Licensing notice --------------------------------------------------* |
410c8acf | 9 | * |
10 | * This file is part of Trivial IP Encryption (TrIPE). | |
11 | * | |
12 | * TrIPE is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
e04c2d50 | 16 | * |
410c8acf | 17 | * TrIPE is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
e04c2d50 | 21 | * |
410c8acf | 22 | * You should have received a copy of the GNU General Public License |
23 | * along with TrIPE; if not, write to the Free Software Foundation, | |
24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | */ | |
26 | ||
410c8acf | 27 | /*----- Header files ------------------------------------------------------*/ |
28 | ||
29 | #include "tripe.h" | |
30 | ||
b5c45da1 | 31 | /*----- Algswitch stuff ---------------------------------------------------*/ |
32 | ||
33 | /* --- @algs_get@ --- * | |
34 | * | |
35 | * Arguments: @algswitch *a@ = where to put the algorithms | |
4998da61 | 36 | * @dstr *e@ = where to write error tokens |
4d36660a | 37 | * @key_file *kf@ = key file |
b5c45da1 | 38 | * @key *k@ = key to inspect |
39 | * | |
4d36660a | 40 | * Returns: Zero if OK; nonzero on error. |
b5c45da1 | 41 | * |
42 | * Use: Extracts an algorithm choice from a key. | |
43 | */ | |
44 | ||
4d36660a | 45 | static int algs_get(algswitch *a, dstr *e, key_file *kf, key *k) |
b5c45da1 | 46 | { |
47 | const char *p; | |
c70a7c5c | 48 | const bulkops *bops; |
b87bffcb | 49 | dstr d = DSTR_INIT, dd = DSTR_INIT; |
4d36660a | 50 | int rc = -1; |
b5c45da1 | 51 | |
4d36660a MW |
52 | /* --- Hash function --- */ |
53 | ||
54 | if ((p = key_getattr(kf, k, "hash")) == 0) p = "rmd160"; | |
55 | if ((a->h = ghash_byname(p)) == 0) { | |
56 | a_format(e, "unknown-hash", "%s", p, A_END); | |
57 | goto done; | |
58 | } | |
b5c45da1 | 59 | |
4d36660a | 60 | /* --- Symmetric encryption for key derivation --- */ |
b5c45da1 | 61 | |
74ee77cb | 62 | if ((p = key_getattr(kf, k, "mgf")) == 0) { |
b5c45da1 | 63 | dstr_reset(&d); |
74ee77cb | 64 | dstr_putf(&d, "%s-mgf", a->h->name); |
b5c45da1 | 65 | p = d.buf; |
66 | } | |
4d36660a MW |
67 | if ((a->mgf = gcipher_byname(p)) == 0) { |
68 | a_format(e, "unknown-mgf-cipher", "%s", p, A_END); | |
69 | goto done; | |
70 | } | |
71 | ||
a93aacce | 72 | /* --- Bulk crypto transform --- */ |
b5c45da1 | 73 | |
a93aacce | 74 | if ((p = key_getattr(kf, k, "bulk")) == 0) p = "v0"; |
c70a7c5c MW |
75 | for (bops = bulktab; bops->name && strcmp(p, bops->name) != 0; bops++); |
76 | if (!bops->name) { | |
a93aacce MW |
77 | a_format(e, "unknown-bulk-transform", "%s", p, A_END); |
78 | goto done; | |
79 | } | |
c70a7c5c MW |
80 | if ((a->bulk = bops->getalgs(a, e, kf, k)) == 0) goto done; |
81 | a->bulk->ops = bops; | |
b5c45da1 | 82 | |
a93aacce MW |
83 | /* --- All done --- */ |
84 | ||
4d36660a | 85 | rc = 0; |
b5c45da1 | 86 | done: |
87 | dstr_destroy(&d); | |
b87bffcb | 88 | dstr_destroy(&dd); |
4d36660a | 89 | return (rc); |
b5c45da1 | 90 | } |
91 | ||
92 | /* --- @algs_check@ --- * | |
93 | * | |
94 | * Arguments: @algswitch *a@ = a choice of algorithms | |
4d36660a | 95 | * @dstr *e@ = where to write error tokens |
5b9f3d37 | 96 | * @const dhgrp *grp@ = the group we're working in |
b5c45da1 | 97 | * |
4d36660a | 98 | * Returns: Zero if OK; nonzero on error. |
b5c45da1 | 99 | * |
100 | * Use: Checks an algorithm choice for sensibleness. This also | |
101 | * derives some useful information from the choices, and you | |
102 | * must call this before committing the algorithm selection | |
103 | * for use by @keyset@ functions. | |
104 | */ | |
105 | ||
5b9f3d37 | 106 | static int algs_check(algswitch *a, dstr *e, const dhgrp *grp) |
b5c45da1 | 107 | { |
b5c45da1 | 108 | a->hashsz = a->h->hashsz; |
b5c45da1 | 109 | |
4d36660a MW |
110 | if (keysz(a->hashsz, a->mgf->keysz) != a->hashsz) { |
111 | a_format(e, "mgf", "%s", a->mgf->name, | |
112 | "restrictive-key-schedule", | |
113 | A_END); | |
114 | return (-1); | |
115 | } | |
b5c45da1 | 116 | |
c70a7c5c | 117 | if (a->bulk->ops->checkalgs(a->bulk, a, e)) return (-1); |
b5c45da1 | 118 | |
119 | return (0); | |
120 | } | |
121 | ||
799e58b9 | 122 | /* --- @km_samealgsp@ --- * |
b5c45da1 | 123 | * |
799e58b9 | 124 | * Arguments: @const kdata *kdx, *kdy@ = two key data objects |
b5c45da1 | 125 | * |
799e58b9 | 126 | * Returns: Nonzero if their two algorithm selections are the same. |
b5c45da1 | 127 | * |
128 | * Use: Checks sameness of algorithm selections: used to ensure that | |
129 | * peers are using sensible algorithms. | |
130 | */ | |
131 | ||
799e58b9 | 132 | int km_samealgsp(const kdata *kdx, const kdata *kdy) |
b5c45da1 | 133 | { |
799e58b9 MW |
134 | const algswitch *a = &kdx->algs, *aa = &kdy->algs; |
135 | ||
5b9f3d37 MW |
136 | return (kdx->grp->ops == kdy->grp->ops && |
137 | kdx->grp->ops->samegrpp(kdx->grp, kdy->grp) && | |
799e58b9 | 138 | a->mgf == aa->mgf && a->h == aa->h && |
c70a7c5c MW |
139 | a->bulk->ops == aa->bulk->ops && |
140 | a->bulk->ops->samealgsp(a->bulk, aa->bulk)); | |
b5c45da1 | 141 | } |
142 | ||
799e58b9 MW |
143 | /*----- Key data and key nodes --------------------------------------------*/ |
144 | ||
145 | typedef struct keyhalf { | |
146 | const char *kind; | |
5b9f3d37 MW |
147 | int (*load)(key_file *, key *, key_data *, |
148 | const dhops *, kdata *, dstr *, dstr *); | |
799e58b9 MW |
149 | const char *kr; |
150 | key_file *kf; | |
151 | fwatch w; | |
152 | sym_table tab; | |
153 | } keyhalf; | |
154 | ||
155 | /* --- @kh_loadpub@, @kh_loadpriv@ --- * | |
156 | * | |
5b9f3d37 MW |
157 | * Arguments: @const dhops *dh@ = Diffie--Hellman operations for key type |
158 | * @key_file *kf@ = key file from which the key was loaded | |
159 | * @key *k@ = the key object we're loading | |
160 | * @key_data *d@ = the key data to load | |
799e58b9 MW |
161 | * @kdata *kd@ = our key-data object to fill in |
162 | * @dstr *t@ = the key tag name | |
163 | * @dstr *e@ = a string to write error tokens to | |
164 | * | |
165 | * Returns: Zero on success, @-1@ on error. | |
166 | * | |
167 | * Use: These functions handle the main difference between public and | |
5b9f3d37 MW |
168 | * private key halves. They are responsible for setting @grp@, |
169 | * @k@ and @K@ appropriately in all keys, handling the mismatch | |
170 | * between the largely half-indifferent calling code and the | |
171 | * group-specific loading functions. | |
799e58b9 MW |
172 | * |
173 | * The function @kh_loadpriv@ is also responsible for checking | |
174 | * the group for goodness. We don't bother checking public | |
175 | * keys, because each public key we actually end up using must | |
176 | * share a group with a private key which we'll already have | |
177 | * checked. | |
178 | */ | |
179 | ||
5b9f3d37 MW |
180 | static int kh_loadpub(key_file *kf, key *k, key_data *d, |
181 | const dhops *dh, kdata *kd, dstr *t, dstr *e) | |
799e58b9 MW |
182 | { |
183 | int rc; | |
184 | ||
5b9f3d37 | 185 | if ((rc = dh->ldpub(kf, k, d, kd, t, e)) != 0) |
799e58b9 | 186 | goto fail_0; |
5b9f3d37 MW |
187 | kd->grp->ops = dh; |
188 | if (kd->grp->ops->checkge(kd->grp, kd->K)) { | |
73174919 | 189 | a_format(e, "bad-public-group-element", A_END); |
799e58b9 MW |
190 | goto fail_1; |
191 | } | |
799e58b9 MW |
192 | return (0); |
193 | ||
194 | fail_1: | |
5b9f3d37 MW |
195 | kd->grp->ops->freege(kd->grp, kd->K); |
196 | kd->grp->ops->freegrp(kd->grp); | |
799e58b9 MW |
197 | fail_0: |
198 | return (-1); | |
199 | } | |
200 | ||
5b9f3d37 MW |
201 | static int kh_loadpriv(key_file *kf, key *k, key_data *d, |
202 | const dhops *dh, kdata *kd, dstr *t, dstr *e) | |
799e58b9 MW |
203 | { |
204 | int rc; | |
205 | const char *err; | |
f1d5c891 MW |
206 | dhge *K; |
207 | int ok; | |
799e58b9 | 208 | |
5b9f3d37 | 209 | if ((rc = dh->ldpriv(kf, k, d, kd, t, e)) != 0) |
799e58b9 | 210 | goto fail_0; |
5b9f3d37 MW |
211 | kd->grp->ops = dh; |
212 | if ((err = kd->grp->ops->checkgrp(kd->grp)) != 0) { | |
799e58b9 MW |
213 | a_format(e, "bad-group", "%s", err, A_END); |
214 | goto fail_1; | |
215 | } | |
f1d5c891 MW |
216 | K = kd->grp->ops->mul(kd->grp, kd->k, 0); |
217 | ok = kd->grp->ops->eq(kd->grp, kd->K, K); | |
218 | kd->grp->ops->freege(kd->grp, K); | |
219 | if (!ok) { | |
220 | a_format(e, "incorrect-public-key", A_END); | |
221 | goto fail_1; | |
222 | } | |
799e58b9 MW |
223 | return (0); |
224 | ||
225 | fail_1: | |
5b9f3d37 MW |
226 | kd->grp->ops->freesc(kd->grp, kd->k); |
227 | kd->grp->ops->freege(kd->grp, kd->K); | |
228 | kd->grp->ops->freegrp(kd->grp); | |
799e58b9 MW |
229 | fail_0: |
230 | return (-1); | |
231 | } | |
232 | ||
233 | static struct keyhalf | |
234 | priv = { "private", kh_loadpriv }, | |
235 | pub = { "public", kh_loadpub }; | |
410c8acf | 236 | |
237 | /* --- @keymoan@ --- * | |
238 | * | |
56814747 | 239 | * Arguments: @const char *file@ = name of the file |
e04c2d50 MW |
240 | * @int line@ = line number in file |
241 | * @const char *msg@ = error message | |
4d36660a | 242 | * @void *p@ = argument pointer (indicates which keyring) |
410c8acf | 243 | * |
e04c2d50 | 244 | * Returns: --- |
410c8acf | 245 | * |
e04c2d50 | 246 | * Use: Reports an error message about loading a key file. |
410c8acf | 247 | */ |
248 | ||
249 | static void keymoan(const char *file, int line, const char *msg, void *p) | |
f43df819 | 250 | { |
799e58b9 | 251 | keyhalf *kh = p; |
4d36660a MW |
252 | |
253 | if (!line) { | |
799e58b9 | 254 | a_warn("KEYMGMT", "%s-keyring", kh->kind, "%s", file, |
4d36660a MW |
255 | "io-error", "?ERRNO", A_END); |
256 | } else { | |
799e58b9 | 257 | a_warn("KEYMGMT", "%s-keyring", kh->kind, "%s", file, "line", "%d", line, |
4d36660a MW |
258 | "%s", msg, A_END); |
259 | } | |
f43df819 | 260 | } |
410c8acf | 261 | |
799e58b9 | 262 | /* --- @kh_reopen@ --- * |
fc5f4823 | 263 | * |
799e58b9 | 264 | * Arguments: @keyhalf *kh@ = pointer to keyhalf structure |
fc5f4823 | 265 | * |
799e58b9 | 266 | * Returns: Zero on success, @-1@ on error. |
fc5f4823 | 267 | * |
799e58b9 MW |
268 | * Use: Reopens the key file for the appropriate key half. If this |
269 | * fails, everything is left as it was; if it succeeds, then the | |
270 | * old file is closed (if it was non-null) and the new one put | |
271 | * in its place. | |
fc5f4823 MW |
272 | */ |
273 | ||
799e58b9 | 274 | static int kh_reopen(keyhalf *kh) |
fc5f4823 | 275 | { |
799e58b9 | 276 | key_file *kf = CREATE(key_file); |
fc5f4823 | 277 | |
799e58b9 MW |
278 | if (key_open(kf, kh->kr, KOPEN_READ, keymoan, kh)) { |
279 | a_warn("KEYMGMT", "%s-keyring", kh->kind, "%s", kh->kr, | |
7f81b1b4 | 280 | "io-error", "?ERRNO", A_END); |
799e58b9 MW |
281 | DESTROY(kf); |
282 | return (-1); | |
283 | } else { | |
284 | if (kh->kf) { | |
285 | key_close(kh->kf); | |
286 | DESTROY(kh->kf); | |
287 | } | |
288 | kh->kf = kf; | |
289 | return (0); | |
290 | } | |
291 | } | |
fc5f4823 | 292 | |
799e58b9 MW |
293 | /* --- @kh_init@ --- * |
294 | * | |
295 | * Arguments: @keyhalf *kh@ = pointer to keyhalf structure to set up | |
296 | * @const char *kr@ = name of the keyring file | |
297 | * | |
298 | * Returns: --- | |
299 | * | |
300 | * Use: Initialize a keyhalf structure, maintaining the private or | |
301 | * public keys. Intended to be called during initialization: | |
302 | * exits if there's some kind of problem. | |
303 | */ | |
fc5f4823 | 304 | |
799e58b9 MW |
305 | static void kh_init(keyhalf *kh, const char *kr) |
306 | { | |
307 | kh->kr = kr; | |
308 | fwatch_init(&kh->w, kr); | |
309 | sym_create(&kh->tab); | |
310 | kh->kf = 0; | |
311 | ||
312 | if (kh_reopen(kh)) | |
313 | die(EXIT_FAILURE, "failed to load %s keyring `%s'", kh->kind, kr); | |
fc5f4823 MW |
314 | } |
315 | ||
799e58b9 | 316 | /* --- @kh_load@ --- * |
410c8acf | 317 | * |
799e58b9 MW |
318 | * Arguments: @keyhalf *kh@ = pointer to keyhalf |
319 | * @const char *tag@ = key tag to be loaded | |
320 | * @int complainp@ = whether to complain about missing keys | |
410c8acf | 321 | * |
799e58b9 MW |
322 | * Returns: Pointer to a @kdata@ structure if successful, or null on |
323 | * failure. | |
410c8acf | 324 | * |
799e58b9 MW |
325 | * Use: Attempts to load a key from the current key file. This |
326 | * function always reads data from the file: it's used when | |
327 | * there's a cache miss from @kh_find@, and when refreshing the | |
328 | * known keys in @kh_refresh@. The returned kdata has a | |
329 | * reference count of exactly 1, and has no home knode. | |
410c8acf | 330 | */ |
331 | ||
799e58b9 | 332 | static kdata *kh_load(keyhalf *kh, const char *tag, int complainp) |
410c8acf | 333 | { |
52c03a2a | 334 | dstr t = DSTR_INIT; |
4d36660a | 335 | dstr e = DSTR_INIT; |
799e58b9 MW |
336 | key *k; |
337 | key_data **d; | |
338 | kdata *kd; | |
339 | const char *ty; | |
5b9f3d37 MW |
340 | const dhops *dh; |
341 | T( const dhgrp *g; ) | |
52c03a2a | 342 | |
799e58b9 | 343 | /* --- Find the key and grab its tag --- */ |
52c03a2a | 344 | |
799e58b9 MW |
345 | if (key_qtag(kh->kf, tag, &t, &k, &d)) { |
346 | if (complainp) { | |
347 | a_warn("KEYMGMT", "%s-keyring", kh->kind, "%s", kh->kr, | |
348 | "key-not-found", "%s", tag, A_END); | |
349 | } | |
350 | goto fail_0; | |
52c03a2a | 351 | } |
352 | ||
799e58b9 MW |
353 | /* --- Find the key's group type and the appropriate operations --- * |
354 | * | |
355 | * There are several places to look for the key type. The most obvious is | |
356 | * the `kx-group' key attribute. But there's also the key type itself, for | |
357 | * compatibility reasons. | |
358 | */ | |
52c03a2a | 359 | |
799e58b9 MW |
360 | ty = key_getattr(kh->kf, k, "kx-group"); |
361 | if (!ty && strncmp(k->type, "tripe-", 6) == 0) ty = k->type + 6; | |
362 | if (!ty) ty = "dh"; | |
52c03a2a | 363 | |
5b9f3d37 MW |
364 | for (dh = dhtab; dh->name; dh++) |
365 | if (strcmp(dh->name, ty) == 0) goto founddh; | |
799e58b9 MW |
366 | a_warn("KEYMGMT", "%s-keyring", kh->kind, |
367 | "%s", kh->kr, "key", "%s", t.buf, | |
368 | "unknown-group-type", "%s", ty, A_END); | |
369 | goto fail_0; | |
370 | ||
5b9f3d37 | 371 | founddh: |
799e58b9 | 372 | kd = CREATE(kdata); |
5b9f3d37 | 373 | if (kh->load(kh->kf, k, *d, dh, kd, &t, &e)) { |
799e58b9 | 374 | a_warn("KEYMGMT", "%s-keyring", kh->kind, |
01d12d8f | 375 | "%s", kh->kr, "key", "%s", t.buf, |
4d36660a | 376 | "*%s", e.buf, A_END); |
799e58b9 | 377 | goto fail_1; |
52c03a2a | 378 | } |
379 | ||
799e58b9 | 380 | if (algs_get(&kd->algs, &e, kh->kf, k) || |
5b9f3d37 | 381 | (kd->k && algs_check(&kd->algs, &e, kd->grp))) { |
799e58b9 MW |
382 | a_warn("KEYMGMT", "%s-keyring", kh->kind, |
383 | "%s", kh->kr, "key", "%s", t.buf, | |
4d36660a | 384 | "*%s", e.buf, A_END); |
799e58b9 | 385 | goto fail_2; |
410c8acf | 386 | } |
52c03a2a | 387 | |
799e58b9 | 388 | kd->tag = xstrdup(t.buf); |
799e58b9 MW |
389 | kd->ref = 1; |
390 | kd->kn = 0; | |
391 | kd->t_exp = k->exp; | |
52c03a2a | 392 | |
393 | IF_TRACING(T_KEYMGMT, { | |
799e58b9 | 394 | trace(T_KEYMGMT, "keymgmt: loaded %s key `%s'", kh->kind, t.buf); |
52c03a2a | 395 | IF_TRACING(T_CRYPTO, { |
5b9f3d37 MW |
396 | g = kd->grp; |
397 | g->ops->tracegrp(g); | |
398 | if (kd->k) | |
399 | trace(T_CRYPTO, "crypto: k = %s", g->ops->scstr(g, kd->k)); | |
400 | trace(T_CRYPTO, "crypto: K = %s", g->ops->gestr(g, kd->K)); | |
c70a7c5c | 401 | kd->algs.bulk->ops->tracealgs(kd->algs.bulk); |
52c03a2a | 402 | }) |
403 | }) | |
404 | ||
799e58b9 | 405 | goto done; |
52c03a2a | 406 | |
799e58b9 | 407 | fail_2: |
5b9f3d37 MW |
408 | if (kd->k) kd->grp->ops->freesc(kd->grp, kd->k); |
409 | kd->grp->ops->freege(kd->grp, kd->K); | |
410 | kd->grp->ops->freegrp(kd->grp); | |
799e58b9 MW |
411 | fail_1: |
412 | DESTROY(kd); | |
413 | fail_0: | |
414 | kd = 0; | |
415 | done: | |
52c03a2a | 416 | dstr_destroy(&t); |
4d36660a | 417 | dstr_destroy(&e); |
799e58b9 | 418 | return (kd); |
410c8acf | 419 | } |
420 | ||
799e58b9 | 421 | /* --- @kh_find@ --- * |
410c8acf | 422 | * |
799e58b9 MW |
423 | * Arguments: @keyhalf *kh@ = pointer to the keyhalf |
424 | * @const char *tag@ = key to be obtained | |
425 | * @int complainp@ = whether to complain about missing keys | |
410c8acf | 426 | * |
799e58b9 | 427 | * Returns: A pointer to the kdata, or null on error. |
410c8acf | 428 | * |
799e58b9 MW |
429 | * Use: Obtains kdata, maybe from the cache. This won't update a |
430 | * stale cache entry, though @kh_refresh@ ought to have done | |
431 | * that already. The returned kdata object may be shared with | |
432 | * other users. (One of this function's responsibilities, over | |
433 | * @kh_load@, is to set the home knode of a freshly loaded | |
434 | * kdata.) | |
410c8acf | 435 | */ |
436 | ||
799e58b9 | 437 | static kdata *kh_find(keyhalf *kh, const char *tag, int complainp) |
410c8acf | 438 | { |
799e58b9 MW |
439 | knode *kn; |
440 | kdata *kd; | |
441 | unsigned f; | |
410c8acf | 442 | |
799e58b9 MW |
443 | kn = sym_find(&kh->tab, tag, -1, sizeof(knode), &f); |
444 | ||
445 | if (f) { | |
446 | if (kn->f & KNF_BROKEN) { | |
447 | T( if (complainp) | |
448 | trace(T_KEYMGMT, "keymgmt: key `%s' marked as broken", tag); ) | |
449 | return (0); | |
450 | } | |
451 | ||
452 | kd = kn->kd; | |
453 | if (kd) kd->ref++; | |
454 | T( trace(T_KEYMGMT, "keymgmt: %scache hit for key `%s'", | |
455 | kd ? "" : "negative ", tag); ) | |
456 | return (kd); | |
457 | } else { | |
458 | kd = kh_load(kh, tag, complainp); | |
459 | kn->kd = kd; | |
460 | kn->kh = kh; | |
461 | kn->f = 0; | |
462 | if (!kd) | |
463 | kn->f |= KNF_BROKEN; | |
464 | else { | |
465 | kd->kn = kn; | |
466 | kd->ref++; | |
467 | } | |
468 | return (kd); | |
410c8acf | 469 | } |
410c8acf | 470 | } |
471 | ||
799e58b9 | 472 | /* --- @kh_refresh@ --- * |
410c8acf | 473 | * |
799e58b9 | 474 | * Arguments: @keyhalf *kh@ = pointer to the keyhalf |
410c8acf | 475 | * |
799e58b9 MW |
476 | * Returns: Zero if nothing needs to be done; nonzero if peers should |
477 | * refresh their keys. | |
410c8acf | 478 | * |
799e58b9 MW |
479 | * Use: Refreshes cached keys from files. |
480 | * | |
481 | * Each active knode is examined to see if a new key is | |
482 | * available: the return value is nonzero if any new keys are. | |
483 | * A key is considered new if its algorithms, public key, or | |
484 | * expiry time are/is different. | |
485 | * | |
486 | * Stub knodes (with no kdata attached) are removed, so that a | |
487 | * later retry can succeed if the file has been fixed. (This | |
488 | * doesn't count as a change, since no peers should be relying | |
489 | * on a nonexistent key.) | |
410c8acf | 490 | */ |
491 | ||
799e58b9 | 492 | static int kh_refresh(keyhalf *kh) |
410c8acf | 493 | { |
799e58b9 MW |
494 | knode *kn; |
495 | kdata *kd; | |
496 | sym_iter i; | |
497 | int changep = 0; | |
498 | ||
499 | if (!fwatch_update(&kh->w, kh->kr) || kh_reopen(kh)) | |
500 | return (0); | |
501 | ||
502 | T( trace(T_KEYMGMT, "keymgmt: rescan %s keyring `%s'", kh->kind, kh->kr); ) | |
503 | for (sym_mkiter(&i, &kh->tab); (kn = sym_next(&i)) != 0; ) { | |
504 | if (!kn->kd) { | |
505 | T( trace(T_KEYMGMT, "keymgmt: discard stub entry for key `%s'", | |
506 | SYM_NAME(kn)); ) | |
507 | sym_remove(&kh->tab, kn); | |
508 | continue; | |
509 | } | |
510 | if ((kd = kh_load(kh, SYM_NAME(kn), 1)) == 0) { | |
511 | if (!(kn->f & KNF_BROKEN)) { | |
512 | T( trace(T_KEYMGMT, "keymgmt: failed to load new key `%s': " | |
513 | "marking it as broken", | |
514 | SYM_NAME(kn)); ) | |
515 | kn->f |= KNF_BROKEN; | |
516 | } | |
517 | continue; | |
518 | } | |
519 | kn->f &= ~KNF_BROKEN; | |
520 | if (kd->t_exp == kn->kd->t_exp && | |
521 | km_samealgsp(kd, kn->kd) && | |
5b9f3d37 | 522 | kd->grp->ops->eq(kd->grp, kd->K, kn->kd->K)) { |
799e58b9 MW |
523 | T( trace(T_KEYMGMT, "keymgmt: key `%s' unchanged", SYM_NAME(kn)); ) |
524 | continue; | |
525 | } | |
526 | T( trace(T_KEYMGMT, "keymgmt: loaded new version of key `%s'", | |
527 | SYM_NAME(kn)); ) | |
528 | km_unref(kn->kd); | |
529 | kd->kn = kn; | |
530 | kn->kd = kd; | |
531 | changep = 1; | |
532 | } | |
410c8acf | 533 | |
799e58b9 MW |
534 | return (changep); |
535 | } | |
410c8acf | 536 | |
799e58b9 | 537 | /*----- Main code ---------------------------------------------------------*/ |
410c8acf | 538 | |
799e58b9 MW |
539 | const char *tag_priv; |
540 | kdata *master; | |
410c8acf | 541 | |
410c8acf | 542 | /* --- @km_init@ --- * |
543 | * | |
799e58b9 MW |
544 | * Arguments: @const char *privkr@ = private keyring file |
545 | * @const char *pubkr@ = public keyring file | |
546 | * @const char *ptag@ = default private-key tag | |
410c8acf | 547 | * |
548 | * Returns: --- | |
549 | * | |
799e58b9 MW |
550 | * Use: Initializes the key-management machinery, loading the |
551 | * keyrings and so on. | |
410c8acf | 552 | */ |
553 | ||
799e58b9 | 554 | void km_init(const char *privkr, const char *pubkr, const char *ptag) |
410c8acf | 555 | { |
b5c45da1 | 556 | const gchash *const *hh; |
410c8acf | 557 | |
b5c45da1 | 558 | for (hh = ghashtab; *hh; hh++) { |
559 | if ((*hh)->hashsz > MAXHASHSZ) { | |
560 | die(EXIT_FAILURE, "INTERNAL ERROR: %s hash length %lu > MAXHASHSZ %d", | |
561 | (*hh)->name, (unsigned long)(*hh)->hashsz, MAXHASHSZ); | |
562 | } | |
563 | } | |
564 | ||
799e58b9 MW |
565 | kh_init(&priv, privkr); |
566 | kh_init(&pub, pubkr); | |
567 | ||
568 | tag_priv = ptag; | |
569 | if ((master = km_findpriv(ptag)) == 0) exit(EXIT_FAILURE); | |
410c8acf | 570 | } |
571 | ||
799e58b9 | 572 | /* --- @km_reload@ --- * |
410c8acf | 573 | * |
799e58b9 | 574 | * Arguments: --- |
410c8acf | 575 | * |
799e58b9 | 576 | * Returns: Zero if OK, nonzero to force reloading of keys. |
410c8acf | 577 | * |
799e58b9 | 578 | * Use: Checks the keyrings to see if they need reloading. |
410c8acf | 579 | */ |
580 | ||
799e58b9 | 581 | int km_reload(void) |
410c8acf | 582 | { |
799e58b9 MW |
583 | int changep = 0; |
584 | kdata *kd; | |
585 | ||
586 | if (kh_refresh(&priv)) { | |
587 | changep = 1; | |
588 | kd = master->kn->kd; | |
35c8b547 | 589 | if (kd != master) { |
799e58b9 MW |
590 | km_unref(master); |
591 | km_ref(kd); | |
592 | master = kd; | |
593 | } | |
594 | } | |
595 | if (kh_refresh(&pub)) | |
596 | changep = 1; | |
597 | return (changep); | |
598 | } | |
52c03a2a | 599 | |
799e58b9 MW |
600 | /* --- @km_findpub@, @km_findpriv@ --- * |
601 | * | |
602 | * Arguments: @const char *tag@ = key tag to load | |
603 | * | |
604 | * Returns: Pointer to the kdata object if successful, or null on error. | |
605 | * | |
606 | * Use: Fetches a public or private key from the keyring. | |
607 | */ | |
52c03a2a | 608 | |
799e58b9 | 609 | kdata *km_findpub(const char *tag) { return (kh_find(&pub, tag, 1)); } |
410c8acf | 610 | |
799e58b9 MW |
611 | kdata *km_findpriv(const char *tag) |
612 | { | |
613 | kdata *kd; | |
52c03a2a | 614 | |
799e58b9 MW |
615 | /* Unpleasantness for the sake of compatibility. */ |
616 | if (!tag && (kd = kh_find(&priv, "tripe", 0)) != 0) return (kd); | |
617 | else return (kh_find(&priv, tag ? tag : "tripe-dh", 1)); | |
618 | } | |
52c03a2a | 619 | |
799e58b9 MW |
620 | /* --- @km_tag@ --- * |
621 | * | |
622 | * Arguments: @kdata *kd@ - pointer to the kdata object | |
623 | * | |
624 | * Returns: A pointer to the short tag by which the kdata was loaded. | |
625 | */ | |
52c03a2a | 626 | |
799e58b9 | 627 | const char *km_tag(kdata *kd) { return (SYM_NAME(kd->kn)); } |
52c03a2a | 628 | |
799e58b9 MW |
629 | /* --- @km_ref@ --- * |
630 | * | |
631 | * Arguments: @kdata *kd@ = pointer to the kdata object | |
632 | * | |
633 | * Returns: --- | |
634 | * | |
635 | * Use: Claim a new reference to a kdata object. | |
636 | */ | |
52c03a2a | 637 | |
799e58b9 | 638 | void km_ref(kdata *kd) { kd->ref++; } |
52c03a2a | 639 | |
799e58b9 MW |
640 | /* --- @km_unref@ --- * |
641 | * | |
642 | * Arguments: @kdata *kd@ = pointer to the kdata object | |
643 | * | |
644 | * Returns: --- | |
645 | * | |
646 | * Use: Releases a reference to a kdata object. | |
647 | */ | |
52c03a2a | 648 | |
799e58b9 MW |
649 | void km_unref(kdata *kd) |
650 | { | |
651 | if (--kd->ref) return; | |
5b9f3d37 MW |
652 | if (kd->k) kd->grp->ops->freesc(kd->grp, kd->k); |
653 | kd->grp->ops->freege(kd->grp, kd->K); | |
654 | kd->grp->ops->freegrp(kd->grp); | |
799e58b9 | 655 | xfree(kd->tag); |
5290b9d5 | 656 | DESTROY(kd); |
799e58b9 MW |
657 | } |
658 | ||
410c8acf | 659 | /*----- That's all, folks -------------------------------------------------*/ |