Commit | Line | Data |
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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 | ||
31 | /*----- Global variables --------------------------------------------------*/ | |
32 | ||
52c03a2a | 33 | group *gg; |
34 | mp *kpriv; | |
9317aa92 | 35 | ge *kpub; |
b5c45da1 | 36 | algswitch algs; |
de7bd20b | 37 | size_t indexsz; |
410c8acf | 38 | |
39 | /*----- Static variables --------------------------------------------------*/ | |
40 | ||
41 | static key_file *kf_pub; | |
42 | static const char *kr_priv, *kr_pub, *tag_priv; | |
43 | static fwatch w_priv, w_pub; | |
44 | ||
52c03a2a | 45 | /*----- Key groups --------------------------------------------------------*/ |
46 | ||
47 | typedef struct kgops { | |
48 | const char *ty; | |
49 | const char *(*loadpriv)(key_data *, group **, mp **, dstr *); | |
50 | const char *(*loadpub)(key_data *, group **, ge **, dstr *); | |
51 | } kgops; | |
52 | ||
53 | /* --- Diffie-Hellman --- */ | |
54 | ||
55 | static const char *kgdh_priv(key_data *kd, group **g, mp **x, dstr *t) | |
56 | { | |
57 | key_packstruct kps[DH_PRIVFETCHSZ]; | |
58 | key_packdef *kp; | |
59 | dh_priv dp; | |
60 | const char *e; | |
61 | int rc; | |
62 | ||
63 | kp = key_fetchinit(dh_privfetch, kps, &dp); | |
64 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
65 | e = key_strerror(rc); | |
66 | goto done; | |
67 | } | |
68 | *g = group_prime(&dp.dp); | |
69 | *x = MP_COPY(dp.x); | |
70 | e = 0; | |
71 | done: | |
72 | key_fetchdone(kp); | |
73 | return (e); | |
74 | } | |
75 | ||
76 | static const char *kgdh_pub(key_data *kd, group **g, ge **p, dstr *t) | |
77 | { | |
78 | key_packstruct kps[DH_PUBFETCHSZ]; | |
79 | key_packdef *kp; | |
80 | dh_pub dp; | |
81 | const char *e; | |
82 | int rc; | |
83 | ||
84 | kp = key_fetchinit(dh_pubfetch, kps, &dp); | |
85 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
86 | e = key_strerror(rc); | |
87 | goto done; | |
88 | } | |
89 | *g = group_prime(&dp.dp); | |
90 | *p = G_CREATE(*g); | |
91 | if (G_FROMINT(*g, *p, dp.y)) { | |
92 | e = "bad public value"; | |
93 | goto done; | |
94 | } | |
95 | e = 0; | |
96 | done: | |
97 | key_fetchdone(kp); | |
98 | return (e); | |
99 | } | |
100 | ||
fc5f4823 | 101 | static const kgops kgdh_ops = { "dh", kgdh_priv, kgdh_pub }; |
52c03a2a | 102 | |
103 | /* --- Elliptic curve --- */ | |
104 | ||
105 | static const char *kgec_priv(key_data *kd, group **g, mp **x, dstr *t) | |
106 | { | |
107 | key_packstruct kps[EC_PRIVFETCHSZ]; | |
108 | key_packdef *kp; | |
109 | ec_priv ep; | |
110 | ec_info ei; | |
111 | const char *e; | |
112 | int rc; | |
113 | ||
114 | kp = key_fetchinit(ec_privfetch, kps, &ep); | |
115 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
116 | e = key_strerror(rc); | |
117 | goto done; | |
118 | } | |
119 | if ((e = ec_getinfo(&ei, ep.cstr)) != 0) | |
120 | goto done; | |
121 | *g = group_ec(&ei); | |
122 | *x = MP_COPY(ep.x); | |
123 | e = 0; | |
124 | done: | |
125 | key_fetchdone(kp); | |
126 | return (e); | |
127 | } | |
128 | ||
129 | static const char *kgec_pub(key_data *kd, group **g, ge **p, dstr *t) | |
130 | { | |
131 | key_packstruct kps[EC_PUBFETCHSZ]; | |
132 | key_packdef *kp; | |
133 | ec_pub ep; | |
134 | ec_info ei; | |
135 | const char *e; | |
136 | int rc; | |
137 | ||
138 | kp = key_fetchinit(ec_pubfetch, kps, &ep); | |
139 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
140 | e = key_strerror(rc); | |
141 | goto done; | |
142 | } | |
143 | if ((e = ec_getinfo(&ei, ep.cstr)) != 0) | |
144 | goto done; | |
145 | *g = group_ec(&ei); | |
146 | *p = G_CREATE(*g); | |
147 | if (G_FROMEC(*g, *p, &ep.p)) { | |
148 | e = "bad public point"; | |
149 | goto done; | |
150 | } | |
151 | e = 0; | |
152 | done: | |
153 | key_fetchdone(kp); | |
154 | return (e); | |
155 | } | |
156 | ||
fc5f4823 | 157 | static const kgops kgec_ops = { "ec", kgec_priv, kgec_pub }; |
52c03a2a | 158 | |
159 | /* --- Table of supported key types --- */ | |
160 | ||
161 | static const kgops *kgtab[] = { &kgdh_ops, &kgec_ops, 0 }; | |
162 | ||
b5c45da1 | 163 | /*----- Algswitch stuff ---------------------------------------------------*/ |
164 | ||
165 | /* --- @algs_get@ --- * | |
166 | * | |
167 | * Arguments: @algswitch *a@ = where to put the algorithms | |
168 | * @key_file *kf@ = key file (for some stupid reason) | |
169 | * @key *k@ = key to inspect | |
170 | * | |
171 | * Returns: Null if OK, or an error message. | |
172 | * | |
173 | * Use: Extracts an algorithm choice from a key. | |
174 | */ | |
175 | ||
176 | static const char *algs_get(algswitch *a, key_file *kf, key *k) | |
177 | { | |
178 | const char *p; | |
179 | char *q; | |
180 | dstr d = DSTR_INIT; | |
181 | const char *e; | |
182 | ||
183 | #define FAIL(msg) do { e = msg; goto done; } while (0) | |
184 | ||
185 | if ((p = key_getattr(kf, k, "cipher")) == 0) | |
186 | p = "blowfish-cbc"; | |
187 | if ((a->c = gcipher_byname(p)) == 0) | |
3cdc3f3a | 188 | FAIL("unknown-cipher"); |
b5c45da1 | 189 | |
190 | if ((p = key_getattr(kf, k, "hash")) == 0) | |
191 | p = "rmd160"; | |
192 | if ((a->h = ghash_byname(p)) == 0) | |
3cdc3f3a | 193 | FAIL("unknown-hash"); |
b5c45da1 | 194 | |
74ee77cb | 195 | if ((p = key_getattr(kf, k, "mgf")) == 0) { |
b5c45da1 | 196 | dstr_reset(&d); |
74ee77cb | 197 | dstr_putf(&d, "%s-mgf", a->h->name); |
b5c45da1 | 198 | p = d.buf; |
199 | } | |
200 | if ((a->mgf = gcipher_byname(p)) == 0) | |
3cdc3f3a | 201 | FAIL("unknown-mgf-cipher"); |
b5c45da1 | 202 | |
203 | if ((p = key_getattr(kf, k, "mac")) != 0) { | |
204 | dstr_reset(&d); | |
205 | dstr_puts(&d, p); | |
206 | if ((q = strchr(d.buf, '/')) != 0) | |
207 | *q++ = 0; | |
208 | if ((a->m = gmac_byname(d.buf)) == 0) | |
3cdc3f3a | 209 | FAIL("unknown-mac"); |
b5c45da1 | 210 | if (!q) |
211 | a->tagsz = a->m->hashsz; | |
212 | else { | |
213 | unsigned long n = strtoul(q, &q, 0); | |
3cdc3f3a | 214 | if (*q) FAIL("bad-tag-length-string"); |
215 | if (n%8 || n > ~(size_t)0) FAIL("bad-tag-length"); | |
b5c45da1 | 216 | a->tagsz = n/8; |
217 | } | |
218 | } else { | |
219 | dstr_reset(&d); | |
220 | dstr_putf(&d, "%s-hmac", a->h->name); | |
221 | if ((a->m = gmac_byname(d.buf)) == 0) | |
3cdc3f3a | 222 | FAIL("no-hmac-for-hash"); |
b5c45da1 | 223 | a->tagsz = a->h->hashsz/2; |
224 | } | |
225 | ||
226 | e = 0; | |
227 | done: | |
228 | dstr_destroy(&d); | |
229 | return (e); | |
230 | } | |
231 | ||
232 | /* --- @algs_check@ --- * | |
233 | * | |
234 | * Arguments: @algswitch *a@ = a choice of algorithms | |
235 | * @const group *g@ = the group we're working in | |
236 | * | |
237 | * Returns: Null if OK, or an error message. | |
238 | * | |
239 | * Use: Checks an algorithm choice for sensibleness. This also | |
240 | * derives some useful information from the choices, and you | |
241 | * must call this before committing the algorithm selection | |
242 | * for use by @keyset@ functions. | |
243 | */ | |
244 | ||
245 | static const char *algs_check(algswitch *a, const group *g) | |
246 | { | |
247 | /* --- Derive the key sizes --- * | |
248 | * | |
249 | * Must ensure that we have non-empty keys. This isn't ideal, but it | |
383a9d71 MW |
250 | * provides a handy sanity check. Also must be based on a 64- or 128-bit |
251 | * block cipher or we can't do the data expiry properly. | |
b5c45da1 | 252 | */ |
253 | ||
254 | a->hashsz = a->h->hashsz; | |
255 | if ((a->cksz = keysz(a->hashsz, a->c->keysz)) == 0) | |
256 | return ("no key size found for cipher"); | |
257 | if ((a->mksz = keysz(a->hashsz, a->m->keysz)) == 0) | |
258 | return ("no key size found for MAC"); | |
259 | ||
383a9d71 MW |
260 | /* --- Derive the data limit --- */ |
261 | ||
262 | if (a->c->blksz < 16) a->expsz = MEG(64); | |
263 | else a->expsz = MEG(2048); | |
264 | ||
b5c45da1 | 265 | /* --- Ensure that the tag size is sane --- */ |
266 | ||
267 | if (a->tagsz > a->m->hashsz) return ("tag length too large"); | |
268 | ||
269 | /* --- Ensure the MGF accepts hashes as keys --- */ | |
270 | ||
271 | if (keysz(a->hashsz, a->mgf->keysz) != a->hashsz) | |
272 | return ("MGF not suitable -- restrictive key schedule"); | |
273 | ||
274 | /* --- All ship-shape and Bristol-fashion --- */ | |
275 | ||
276 | return (0); | |
277 | } | |
278 | ||
279 | /* --- @algs_samep@ --- * | |
280 | * | |
281 | * Arguments: @const algswitch *a, *aa@ = two algorithm selections | |
282 | * | |
283 | * Returns: Nonzero if the two selections are the same. | |
284 | * | |
285 | * Use: Checks sameness of algorithm selections: used to ensure that | |
286 | * peers are using sensible algorithms. | |
287 | */ | |
288 | ||
289 | static int algs_samep(const algswitch *a, const algswitch *aa) | |
290 | { | |
291 | return (a->c == aa->c && a->mgf == aa->mgf && a->h == aa->h && | |
292 | a->m == aa->m && a->tagsz == aa->tagsz); | |
293 | } | |
294 | ||
410c8acf | 295 | /*----- Main code ---------------------------------------------------------*/ |
296 | ||
297 | /* --- @keymoan@ --- * | |
298 | * | |
56814747 | 299 | * Arguments: @const char *file@ = name of the file |
e04c2d50 MW |
300 | * @int line@ = line number in file |
301 | * @const char *msg@ = error message | |
302 | * @void *p@ = argument pointer | |
410c8acf | 303 | * |
e04c2d50 | 304 | * Returns: --- |
410c8acf | 305 | * |
e04c2d50 | 306 | * Use: Reports an error message about loading a key file. |
410c8acf | 307 | */ |
308 | ||
309 | static void keymoan(const char *file, int line, const char *msg, void *p) | |
f43df819 MW |
310 | { |
311 | a_warn("KEYMGMT", | |
312 | "key-file-error", | |
313 | "%s:%i", file, line, | |
314 | "%s", msg, | |
315 | A_END); | |
316 | } | |
410c8acf | 317 | |
fc5f4823 MW |
318 | /* --- @keykg@ --- * |
319 | * | |
320 | * Arguments: @key_file *kf@ = pointer to key file | |
321 | * @key *k@ = pointer to key | |
322 | * @const char **tyr@ = where to put the type string | |
323 | * | |
324 | * Returns: Pointer to indicated key-group options, or null. | |
325 | * | |
326 | * Use: Looks up a key's group indicator and tries to find a matching | |
327 | * table entry. | |
328 | */ | |
329 | ||
330 | static const kgops *keykg(key_file *kf, key *k, const char **tyr) | |
331 | { | |
332 | const char *ty; | |
333 | const kgops **ko; | |
334 | ||
335 | /* --- Look up the key type in the table --- * | |
336 | * | |
337 | * There are several places to look for this. The most obvious is the | |
338 | * `kx-group' key attribute. But there's also the key type itself. | |
339 | */ | |
340 | ||
341 | ty = key_getattr(kf, k, "kx-group"); | |
342 | if (!ty && strncmp(k->type, "tripe-", 6) == 0) ty = k->type + 6; | |
343 | if (!ty) ty = "dh"; | |
344 | if (tyr) *tyr = ty; | |
345 | ||
346 | for (ko = kgtab; *ko; ko++) { | |
347 | if (strcmp((*ko)->ty, ty) == 0) | |
348 | return (*ko); | |
349 | } | |
350 | return (0); | |
351 | } | |
352 | ||
410c8acf | 353 | /* --- @loadpriv@ --- * |
354 | * | |
355 | * Arguments: @dstr *d@ = string to write errors in | |
410c8acf | 356 | * |
357 | * Returns: Zero if OK, nonzero on error. | |
358 | * | |
359 | * Use: Loads the private key from its keyfile. | |
360 | */ | |
361 | ||
52c03a2a | 362 | static int loadpriv(dstr *d) |
410c8acf | 363 | { |
364 | key_file kf; | |
52c03a2a | 365 | key *k; |
d59d4fe9 | 366 | key_data **kd; |
52c03a2a | 367 | dstr t = DSTR_INIT; |
368 | group *g = 0; | |
369 | mp *x = 0; | |
370 | int rc = -1; | |
fc5f4823 MW |
371 | const kgops *ko; |
372 | const char *e, *tag, *ty; | |
b5c45da1 | 373 | algswitch a; |
52c03a2a | 374 | |
375 | /* --- Open the private key file --- */ | |
410c8acf | 376 | |
377 | if (key_open(&kf, kr_priv, KOPEN_READ, keymoan, 0)) { | |
378 | dstr_putf(d, "error reading private keyring `%s': %s", | |
379 | kr_priv, strerror(errno)); | |
52c03a2a | 380 | goto done_0; |
381 | } | |
382 | ||
383 | /* --- Find the private key --- */ | |
384 | ||
fc5f4823 MW |
385 | if (tag_priv ? |
386 | key_qtag(&kf, tag = tag_priv, &t, &k, &kd) : | |
387 | key_qtag(&kf, tag = "tripe", &t, &k, &kd) && | |
e2fe2afd | 388 | key_qtag(&kf, tag = "tripe-dh", &t, &k, &kd)) { |
fc5f4823 | 389 | dstr_putf(d, "private key `%s' not found in keyring `%s'", tag, kr_priv); |
52c03a2a | 390 | goto done_1; |
391 | } | |
392 | ||
393 | /* --- Look up the key type in the table --- */ | |
394 | ||
fc5f4823 MW |
395 | if ((ko = keykg(&kf, k, &ty)) == 0) { |
396 | dstr_putf(d, "private key `%s' has unknown type `%s'", t.buf, ty); | |
397 | goto done_1; | |
52c03a2a | 398 | } |
52c03a2a | 399 | |
400 | /* --- Load the key --- */ | |
401 | ||
fc5f4823 | 402 | if ((e = ko->loadpriv(*kd, &g, &x, &t)) != 0) { |
52c03a2a | 403 | dstr_putf(d, "error reading private key `%s': %s", t.buf, e); |
404 | goto done_1; | |
405 | } | |
406 | ||
407 | /* --- Check that the key is sensible --- */ | |
408 | ||
409 | if ((e = G_CHECK(g, &rand_global)) != 0) { | |
410 | dstr_putf(d, "bad group in private key `%s': %s", t.buf, e); | |
411 | goto done_1; | |
412 | } | |
413 | ||
b5c45da1 | 414 | /* --- Collect the algorithms --- */ |
415 | ||
416 | if ((e = algs_get(&a, &kf, k)) != 0 || | |
417 | (e = algs_check(&a, g)) != 0) { | |
418 | dstr_putf(d, "bad symmetric algorithm selection in private key `%s': %s", | |
419 | t.buf, e); | |
420 | goto done_1; | |
421 | } | |
422 | ||
52c03a2a | 423 | /* --- Good, we're happy --- * |
424 | * | |
e04c2d50 | 425 | * Dodginess! We change the group over here, but don't free any old group |
52c03a2a | 426 | * elements. This assumes that the new group is basically the same as the |
427 | * old one, and will happily adopt the existing elements. If it isn't, | |
428 | * then we lose badly. Check this, then. | |
429 | */ | |
430 | ||
431 | if (gg) { | |
432 | if (!group_samep(g, gg)) { | |
433 | dstr_putf(d, "private key `%s' has different group", t.buf); | |
434 | goto done_1; | |
410c8acf | 435 | } |
52c03a2a | 436 | G_DESTROYGROUP(gg); |
410c8acf | 437 | } |
52c03a2a | 438 | if (kpriv) |
439 | mp_drop(kpriv); | |
440 | ||
9317aa92 MW |
441 | if (kpub) |
442 | G_DESTROY(g, kpub); | |
443 | kpub = G_CREATE(g); | |
444 | G_EXP(g, kpub, g->g, x); | |
de7bd20b | 445 | indexsz = mp_octets(g->r); |
9317aa92 | 446 | |
52c03a2a | 447 | /* --- Dump out the group --- */ |
448 | ||
449 | IF_TRACING(T_KEYMGMT, { | |
450 | trace(T_KEYMGMT, "keymgmt: extracted private key `%s'", t.buf); | |
451 | IF_TRACING(T_CRYPTO, { | |
452 | trace(T_CRYPTO, "crypto: r = %s", mpstr(g->r)); | |
453 | trace(T_CRYPTO, "crypto: h = %s", mpstr(g->h)); | |
454 | trace(T_CRYPTO, "crypto: x = %s", mpstr(x)); | |
b5c45da1 | 455 | trace(T_CRYPTO, "crypto: cipher = %s", a.c->name); |
456 | trace(T_CRYPTO, "crypto: mgf = %s", a.mgf->name); | |
457 | trace(T_CRYPTO, "crypto: hash = %s", a.h->name); | |
458 | trace(T_CRYPTO, "crypto: mac = %s/%lu", | |
459 | a.m->name, (unsigned long)a.tagsz * 8); | |
52c03a2a | 460 | }) |
461 | }) | |
462 | ||
463 | /* --- Success! --- */ | |
464 | ||
465 | gg = g; g = 0; | |
b5c45da1 | 466 | algs = a; |
52c03a2a | 467 | kpriv = x; x = 0; |
468 | rc = 0; | |
469 | ||
470 | /* --- Tidy up --- */ | |
471 | ||
472 | done_1: | |
473 | key_close(&kf); | |
474 | done_0: | |
475 | dstr_destroy(&t); | |
476 | if (x) mp_drop(x); | |
477 | if (g) G_DESTROYGROUP(g); | |
410c8acf | 478 | return (rc); |
479 | } | |
480 | ||
481 | /* --- @loadpub@ --- * | |
482 | * | |
483 | * Arguments: @dstr *d@ = string to write errors to | |
484 | * | |
485 | * Returns: Zero if OK, nonzero on error. | |
486 | * | |
487 | * Use: Reloads the public keyring. | |
488 | */ | |
489 | ||
490 | static int loadpub(dstr *d) | |
491 | { | |
492 | key_file *kf = CREATE(key_file); | |
493 | ||
494 | if (key_open(kf, kr_pub, KOPEN_READ, keymoan, 0)) { | |
495 | dstr_putf(d, "error reading public keyring `%s': %s", | |
496 | kr_pub, strerror(errno)); | |
497 | DESTROY(kf); | |
498 | return (-1); | |
499 | } | |
500 | kf_pub = kf; | |
501 | T( trace(T_KEYMGMT, "keymgmt: loaded public keyring `%s'", kr_pub); ) | |
502 | return (0); | |
503 | } | |
504 | ||
de014da6 | 505 | /* --- @km_reload@ --- * |
410c8acf | 506 | * |
507 | * Arguments: --- | |
508 | * | |
509 | * Returns: Zero if OK, nonzero to force reloading of keys. | |
510 | * | |
de014da6 | 511 | * Use: Checks the keyrings to see if they need reloading. |
410c8acf | 512 | */ |
513 | ||
de014da6 | 514 | int km_reload(void) |
410c8acf | 515 | { |
516 | dstr d = DSTR_INIT; | |
410c8acf | 517 | key_file *kf; |
518 | int reload = 0; | |
519 | ||
520 | /* --- Check the private key first --- */ | |
521 | ||
522 | if (fwatch_update(&w_priv, kr_priv)) { | |
523 | T( trace(T_KEYMGMT, "keymgmt: private keyring updated: reloading..."); ) | |
524 | DRESET(&d); | |
52c03a2a | 525 | if (loadpriv(&d)) |
f43df819 | 526 | a_warn("KEYMGMT", "bad-private-key", "%s", d.buf, A_END); |
52c03a2a | 527 | else |
410c8acf | 528 | reload = 1; |
410c8acf | 529 | } |
530 | ||
531 | /* --- Now check the public keys --- */ | |
532 | ||
533 | if (fwatch_update(&w_pub, kr_pub)) { | |
534 | T( trace(T_KEYMGMT, "keymgmt: public keyring updated: reloading..."); ) | |
535 | kf = kf_pub; | |
536 | DRESET(&d); | |
537 | if (loadpub(&d)) | |
f43df819 | 538 | a_warn("KEYMGMT", "bad-public-keyring", "%s", d.buf, A_END); |
410c8acf | 539 | else { |
540 | reload = 1; | |
541 | key_close(kf); | |
542 | DESTROY(kf); | |
543 | } | |
544 | } | |
545 | ||
546 | /* --- Done --- */ | |
547 | ||
548 | return (reload); | |
549 | } | |
550 | ||
551 | /* --- @km_init@ --- * | |
552 | * | |
553 | * Arguments: @const char *priv@ = private keyring file | |
554 | * @const char *pub@ = public keyring file | |
555 | * @const char *tag@ = tag to load | |
556 | * | |
557 | * Returns: --- | |
558 | * | |
559 | * Use: Initializes, and loads the private key. | |
560 | */ | |
561 | ||
562 | void km_init(const char *priv, const char *pub, const char *tag) | |
563 | { | |
564 | dstr d = DSTR_INIT; | |
b5c45da1 | 565 | const gchash *const *hh; |
410c8acf | 566 | |
567 | kr_priv = priv; | |
568 | kr_pub = pub; | |
569 | tag_priv = tag; | |
570 | fwatch_init(&w_priv, kr_priv); | |
571 | fwatch_init(&w_pub, kr_pub); | |
572 | ||
b5c45da1 | 573 | for (hh = ghashtab; *hh; hh++) { |
574 | if ((*hh)->hashsz > MAXHASHSZ) { | |
575 | die(EXIT_FAILURE, "INTERNAL ERROR: %s hash length %lu > MAXHASHSZ %d", | |
576 | (*hh)->name, (unsigned long)(*hh)->hashsz, MAXHASHSZ); | |
577 | } | |
578 | } | |
579 | ||
410c8acf | 580 | DRESET(&d); |
52c03a2a | 581 | if (loadpriv(&d)) |
410c8acf | 582 | die(EXIT_FAILURE, "%s", d.buf); |
410c8acf | 583 | if (loadpub(&d)) |
584 | die(EXIT_FAILURE, "%s", d.buf); | |
585 | } | |
586 | ||
587 | /* --- @km_getpubkey@ --- * | |
588 | * | |
589 | * Arguments: @const char *tag@ = public key tag to load | |
52c03a2a | 590 | * @ge *kpub@ = where to put the public key |
00e64b67 | 591 | * @time_t *t_exp@ = where to put the expiry time |
410c8acf | 592 | * |
593 | * Returns: Zero if OK, nonzero if it failed. | |
594 | * | |
595 | * Use: Fetches a public key from the keyring. | |
596 | */ | |
597 | ||
52c03a2a | 598 | int km_getpubkey(const char *tag, ge *kpub, time_t *t_exp) |
410c8acf | 599 | { |
00e64b67 | 600 | key *k; |
d59d4fe9 | 601 | key_data **kd; |
52c03a2a | 602 | dstr t = DSTR_INIT; |
fc5f4823 MW |
603 | const kgops *ko; |
604 | const char *e, *ty; | |
52c03a2a | 605 | group *g = 0; |
606 | ge *p = 0; | |
b5c45da1 | 607 | algswitch a; |
52c03a2a | 608 | int rc = -1; |
609 | ||
610 | /* --- Find the key --- */ | |
611 | ||
612 | if (key_qtag(kf_pub, tag, &t, &k, &kd)) { | |
f43df819 | 613 | a_warn("KEYMGMT", "public-key", "%s", tag, "not-found", A_END); |
52c03a2a | 614 | goto done; |
615 | } | |
410c8acf | 616 | |
52c03a2a | 617 | /* --- Look up the key type in the table --- */ |
618 | ||
fc5f4823 MW |
619 | if ((ko = keykg(kf_pub, k, &ty)) == 0) { |
620 | a_warn("KEYMGMT", | |
621 | "public-key", "%s", t.buf, | |
622 | "unknown-type", "%s", ty, | |
623 | A_END); | |
624 | goto done; | |
52c03a2a | 625 | } |
52c03a2a | 626 | |
627 | /* --- Load the key --- */ | |
628 | ||
fc5f4823 | 629 | if ((e = ko->loadpub(*kd, &g, &p, &t)) != 0) { |
f43df819 | 630 | a_warn("KEYMGMT", "public-key", "%s", t.buf, "bad", "%s", e, A_END); |
52c03a2a | 631 | goto done; |
632 | } | |
633 | ||
634 | /* --- Ensure that the group is correct --- * | |
635 | * | |
e04c2d50 | 636 | * Dodginess! We assume that if this works, our global group is willing to |
52c03a2a | 637 | * adopt this public element. Probably reasonable. |
638 | */ | |
639 | ||
640 | if (!group_samep(gg, g)) { | |
f43df819 | 641 | a_warn("KEYMGMT", "public-key", "%s", t.buf, "incorrect-group", A_END); |
52c03a2a | 642 | goto done; |
643 | } | |
644 | ||
645 | /* --- Check the public group element --- */ | |
646 | ||
647 | if (group_check(gg, p)) { | |
f43df819 MW |
648 | a_warn("KEYMGMT", |
649 | "public-key", "%s", t.buf, | |
650 | "bad-public-group-element", | |
651 | A_END); | |
52c03a2a | 652 | goto done; |
410c8acf | 653 | } |
52c03a2a | 654 | |
b5c45da1 | 655 | /* --- Check the algorithms --- */ |
656 | ||
657 | if ((e = algs_get(&a, kf_pub, k)) != 0) { | |
f43df819 MW |
658 | a_warn("KEYMGMT", |
659 | "public-key", "%s", t.buf, | |
660 | "bad-algorithm-selection", e, | |
661 | A_END); | |
b5c45da1 | 662 | goto done; |
663 | } | |
3cdc3f3a | 664 | if (!algs_samep(&a, &algs)) { |
f43df819 MW |
665 | a_warn("KEYMGMT", |
666 | "public-key", "%s", t.buf, | |
667 | "algorithm-mismatch", | |
668 | A_END); | |
b5c45da1 | 669 | goto done; |
670 | } | |
671 | ||
52c03a2a | 672 | /* --- Dump the public key --- */ |
673 | ||
410c8acf | 674 | IF_TRACING(T_KEYMGMT, { |
52c03a2a | 675 | trace(T_KEYMGMT, "keymgmt: extracted public key `%s'", t.buf); |
676 | trace(T_CRYPTO, "crypto: p = %s", gestr(gg, p)); | |
410c8acf | 677 | }) |
52c03a2a | 678 | |
679 | /* --- OK, accept the public key --- */ | |
680 | ||
00e64b67 | 681 | *t_exp = k->exp; |
52c03a2a | 682 | G_COPY(gg, kpub, p); |
683 | rc = 0; | |
684 | ||
685 | /* --- Tidy up --- */ | |
686 | ||
687 | done: | |
688 | if (p) G_DESTROY(g, p); | |
689 | if (g) G_DESTROYGROUP(g); | |
690 | dstr_destroy(&t); | |
691 | return (rc); | |
410c8acf | 692 | } |
693 | ||
694 | /*----- That's all, folks -------------------------------------------------*/ |