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410c8acf | 1 | /* -*-c-*- |
2 | * | |
3cdc3f3a | 3 | * $Id$ |
410c8acf | 4 | * |
5 | * Key loading and storing | |
6 | * | |
7 | * (c) 2001 Straylight/Edgeware | |
8 | */ | |
9 | ||
10 | /*----- Licensing notice --------------------------------------------------* | |
11 | * | |
12 | * This file is part of Trivial IP Encryption (TrIPE). | |
13 | * | |
14 | * TrIPE is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * TrIPE 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 General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with TrIPE; if not, write to the Free Software Foundation, | |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
27 | */ | |
28 | ||
410c8acf | 29 | /*----- Header files ------------------------------------------------------*/ |
30 | ||
31 | #include "tripe.h" | |
32 | ||
33 | /*----- Global variables --------------------------------------------------*/ | |
34 | ||
52c03a2a | 35 | group *gg; |
36 | mp *kpriv; | |
9317aa92 | 37 | ge *kpub; |
b5c45da1 | 38 | algswitch algs; |
de7bd20b | 39 | size_t indexsz; |
410c8acf | 40 | |
41 | /*----- Static variables --------------------------------------------------*/ | |
42 | ||
43 | static key_file *kf_pub; | |
44 | static const char *kr_priv, *kr_pub, *tag_priv; | |
45 | static fwatch w_priv, w_pub; | |
46 | ||
52c03a2a | 47 | /*----- Key groups --------------------------------------------------------*/ |
48 | ||
49 | typedef struct kgops { | |
50 | const char *ty; | |
51 | const char *(*loadpriv)(key_data *, group **, mp **, dstr *); | |
52 | const char *(*loadpub)(key_data *, group **, ge **, dstr *); | |
53 | } kgops; | |
54 | ||
55 | /* --- Diffie-Hellman --- */ | |
56 | ||
57 | static const char *kgdh_priv(key_data *kd, group **g, mp **x, dstr *t) | |
58 | { | |
59 | key_packstruct kps[DH_PRIVFETCHSZ]; | |
60 | key_packdef *kp; | |
61 | dh_priv dp; | |
62 | const char *e; | |
63 | int rc; | |
64 | ||
65 | kp = key_fetchinit(dh_privfetch, kps, &dp); | |
66 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
67 | e = key_strerror(rc); | |
68 | goto done; | |
69 | } | |
70 | *g = group_prime(&dp.dp); | |
71 | *x = MP_COPY(dp.x); | |
72 | e = 0; | |
73 | done: | |
74 | key_fetchdone(kp); | |
75 | return (e); | |
76 | } | |
77 | ||
78 | static const char *kgdh_pub(key_data *kd, group **g, ge **p, dstr *t) | |
79 | { | |
80 | key_packstruct kps[DH_PUBFETCHSZ]; | |
81 | key_packdef *kp; | |
82 | dh_pub dp; | |
83 | const char *e; | |
84 | int rc; | |
85 | ||
86 | kp = key_fetchinit(dh_pubfetch, kps, &dp); | |
87 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
88 | e = key_strerror(rc); | |
89 | goto done; | |
90 | } | |
91 | *g = group_prime(&dp.dp); | |
92 | *p = G_CREATE(*g); | |
93 | if (G_FROMINT(*g, *p, dp.y)) { | |
94 | e = "bad public value"; | |
95 | goto done; | |
96 | } | |
97 | e = 0; | |
98 | done: | |
99 | key_fetchdone(kp); | |
100 | return (e); | |
101 | } | |
102 | ||
103 | static const kgops kgdh_ops = { "tripe-dh", kgdh_priv, kgdh_pub }; | |
104 | ||
105 | /* --- Elliptic curve --- */ | |
106 | ||
107 | static const char *kgec_priv(key_data *kd, group **g, mp **x, dstr *t) | |
108 | { | |
109 | key_packstruct kps[EC_PRIVFETCHSZ]; | |
110 | key_packdef *kp; | |
111 | ec_priv ep; | |
112 | ec_info ei; | |
113 | const char *e; | |
114 | int rc; | |
115 | ||
116 | kp = key_fetchinit(ec_privfetch, kps, &ep); | |
117 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
118 | e = key_strerror(rc); | |
119 | goto done; | |
120 | } | |
121 | if ((e = ec_getinfo(&ei, ep.cstr)) != 0) | |
122 | goto done; | |
123 | *g = group_ec(&ei); | |
124 | *x = MP_COPY(ep.x); | |
125 | e = 0; | |
126 | done: | |
127 | key_fetchdone(kp); | |
128 | return (e); | |
129 | } | |
130 | ||
131 | static const char *kgec_pub(key_data *kd, group **g, ge **p, dstr *t) | |
132 | { | |
133 | key_packstruct kps[EC_PUBFETCHSZ]; | |
134 | key_packdef *kp; | |
135 | ec_pub ep; | |
136 | ec_info ei; | |
137 | const char *e; | |
138 | int rc; | |
139 | ||
140 | kp = key_fetchinit(ec_pubfetch, kps, &ep); | |
141 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
142 | e = key_strerror(rc); | |
143 | goto done; | |
144 | } | |
145 | if ((e = ec_getinfo(&ei, ep.cstr)) != 0) | |
146 | goto done; | |
147 | *g = group_ec(&ei); | |
148 | *p = G_CREATE(*g); | |
149 | if (G_FROMEC(*g, *p, &ep.p)) { | |
150 | e = "bad public point"; | |
151 | goto done; | |
152 | } | |
153 | e = 0; | |
154 | done: | |
155 | key_fetchdone(kp); | |
156 | return (e); | |
157 | } | |
158 | ||
159 | static const kgops kgec_ops = { "tripe-ec", kgec_priv, kgec_pub }; | |
160 | ||
161 | /* --- Table of supported key types --- */ | |
162 | ||
163 | static const kgops *kgtab[] = { &kgdh_ops, &kgec_ops, 0 }; | |
164 | ||
b5c45da1 | 165 | /*----- Algswitch stuff ---------------------------------------------------*/ |
166 | ||
167 | /* --- @algs_get@ --- * | |
168 | * | |
169 | * Arguments: @algswitch *a@ = where to put the algorithms | |
170 | * @key_file *kf@ = key file (for some stupid reason) | |
171 | * @key *k@ = key to inspect | |
172 | * | |
173 | * Returns: Null if OK, or an error message. | |
174 | * | |
175 | * Use: Extracts an algorithm choice from a key. | |
176 | */ | |
177 | ||
178 | static const char *algs_get(algswitch *a, key_file *kf, key *k) | |
179 | { | |
180 | const char *p; | |
181 | char *q; | |
182 | dstr d = DSTR_INIT; | |
183 | const char *e; | |
184 | ||
185 | #define FAIL(msg) do { e = msg; goto done; } while (0) | |
186 | ||
187 | if ((p = key_getattr(kf, k, "cipher")) == 0) | |
188 | p = "blowfish-cbc"; | |
189 | if ((a->c = gcipher_byname(p)) == 0) | |
3cdc3f3a | 190 | FAIL("unknown-cipher"); |
b5c45da1 | 191 | |
192 | if ((p = key_getattr(kf, k, "hash")) == 0) | |
193 | p = "rmd160"; | |
194 | if ((a->h = ghash_byname(p)) == 0) | |
3cdc3f3a | 195 | FAIL("unknown-hash"); |
b5c45da1 | 196 | |
74ee77cb | 197 | if ((p = key_getattr(kf, k, "mgf")) == 0) { |
b5c45da1 | 198 | dstr_reset(&d); |
74ee77cb | 199 | dstr_putf(&d, "%s-mgf", a->h->name); |
b5c45da1 | 200 | p = d.buf; |
201 | } | |
202 | if ((a->mgf = gcipher_byname(p)) == 0) | |
3cdc3f3a | 203 | FAIL("unknown-mgf-cipher"); |
b5c45da1 | 204 | |
205 | if ((p = key_getattr(kf, k, "mac")) != 0) { | |
206 | dstr_reset(&d); | |
207 | dstr_puts(&d, p); | |
208 | if ((q = strchr(d.buf, '/')) != 0) | |
209 | *q++ = 0; | |
210 | if ((a->m = gmac_byname(d.buf)) == 0) | |
3cdc3f3a | 211 | FAIL("unknown-mac"); |
b5c45da1 | 212 | if (!q) |
213 | a->tagsz = a->m->hashsz; | |
214 | else { | |
215 | unsigned long n = strtoul(q, &q, 0); | |
3cdc3f3a | 216 | if (*q) FAIL("bad-tag-length-string"); |
217 | if (n%8 || n > ~(size_t)0) FAIL("bad-tag-length"); | |
b5c45da1 | 218 | a->tagsz = n/8; |
219 | } | |
220 | } else { | |
221 | dstr_reset(&d); | |
222 | dstr_putf(&d, "%s-hmac", a->h->name); | |
223 | if ((a->m = gmac_byname(d.buf)) == 0) | |
3cdc3f3a | 224 | FAIL("no-hmac-for-hash"); |
b5c45da1 | 225 | a->tagsz = a->h->hashsz/2; |
226 | } | |
227 | ||
228 | e = 0; | |
229 | done: | |
230 | dstr_destroy(&d); | |
231 | return (e); | |
232 | } | |
233 | ||
234 | /* --- @algs_check@ --- * | |
235 | * | |
236 | * Arguments: @algswitch *a@ = a choice of algorithms | |
237 | * @const group *g@ = the group we're working in | |
238 | * | |
239 | * Returns: Null if OK, or an error message. | |
240 | * | |
241 | * Use: Checks an algorithm choice for sensibleness. This also | |
242 | * derives some useful information from the choices, and you | |
243 | * must call this before committing the algorithm selection | |
244 | * for use by @keyset@ functions. | |
245 | */ | |
246 | ||
247 | static const char *algs_check(algswitch *a, const group *g) | |
248 | { | |
249 | /* --- Derive the key sizes --- * | |
250 | * | |
251 | * Must ensure that we have non-empty keys. This isn't ideal, but it | |
252 | * provides a handy sanity check. | |
253 | */ | |
254 | ||
255 | a->hashsz = a->h->hashsz; | |
256 | if ((a->cksz = keysz(a->hashsz, a->c->keysz)) == 0) | |
257 | return ("no key size found for cipher"); | |
258 | if ((a->mksz = keysz(a->hashsz, a->m->keysz)) == 0) | |
259 | return ("no key size found for MAC"); | |
260 | ||
261 | /* --- Ensure that the tag size is sane --- */ | |
262 | ||
263 | if (a->tagsz > a->m->hashsz) return ("tag length too large"); | |
264 | ||
265 | /* --- Ensure the MGF accepts hashes as keys --- */ | |
266 | ||
267 | if (keysz(a->hashsz, a->mgf->keysz) != a->hashsz) | |
268 | return ("MGF not suitable -- restrictive key schedule"); | |
269 | ||
270 | /* --- All ship-shape and Bristol-fashion --- */ | |
271 | ||
272 | return (0); | |
273 | } | |
274 | ||
275 | /* --- @algs_samep@ --- * | |
276 | * | |
277 | * Arguments: @const algswitch *a, *aa@ = two algorithm selections | |
278 | * | |
279 | * Returns: Nonzero if the two selections are the same. | |
280 | * | |
281 | * Use: Checks sameness of algorithm selections: used to ensure that | |
282 | * peers are using sensible algorithms. | |
283 | */ | |
284 | ||
285 | static int algs_samep(const algswitch *a, const algswitch *aa) | |
286 | { | |
287 | return (a->c == aa->c && a->mgf == aa->mgf && a->h == aa->h && | |
288 | a->m == aa->m && a->tagsz == aa->tagsz); | |
289 | } | |
290 | ||
410c8acf | 291 | /*----- Main code ---------------------------------------------------------*/ |
292 | ||
293 | /* --- @keymoan@ --- * | |
294 | * | |
56814747 | 295 | * Arguments: @const char *file@ = name of the file |
410c8acf | 296 | * @int line@ = line number in file |
297 | * @const char *msg@ = error message | |
298 | * @void *p@ = argument pointer | |
299 | * | |
300 | * Returns: --- | |
301 | * | |
302 | * Use: Reports an error message about loading a key file. | |
303 | */ | |
304 | ||
305 | static void keymoan(const char *file, int line, const char *msg, void *p) | |
f43df819 MW |
306 | { |
307 | a_warn("KEYMGMT", | |
308 | "key-file-error", | |
309 | "%s:%i", file, line, | |
310 | "%s", msg, | |
311 | A_END); | |
312 | } | |
410c8acf | 313 | |
314 | /* --- @loadpriv@ --- * | |
315 | * | |
316 | * Arguments: @dstr *d@ = string to write errors in | |
410c8acf | 317 | * |
318 | * Returns: Zero if OK, nonzero on error. | |
319 | * | |
320 | * Use: Loads the private key from its keyfile. | |
321 | */ | |
322 | ||
52c03a2a | 323 | static int loadpriv(dstr *d) |
410c8acf | 324 | { |
325 | key_file kf; | |
52c03a2a | 326 | key *k; |
d59d4fe9 | 327 | key_data **kd; |
52c03a2a | 328 | dstr t = DSTR_INIT; |
329 | group *g = 0; | |
330 | mp *x = 0; | |
331 | int rc = -1; | |
332 | const kgops **ko; | |
333 | const char *e; | |
b5c45da1 | 334 | algswitch a; |
52c03a2a | 335 | |
336 | /* --- Open the private key file --- */ | |
410c8acf | 337 | |
338 | if (key_open(&kf, kr_priv, KOPEN_READ, keymoan, 0)) { | |
339 | dstr_putf(d, "error reading private keyring `%s': %s", | |
340 | kr_priv, strerror(errno)); | |
52c03a2a | 341 | goto done_0; |
342 | } | |
343 | ||
344 | /* --- Find the private key --- */ | |
345 | ||
346 | if (key_qtag(&kf, tag_priv, &t, &k, &kd)) { | |
347 | dstr_putf(d, "private key `%s' not found in keyring `%s'", | |
348 | tag_priv, kr_priv); | |
349 | goto done_1; | |
350 | } | |
351 | ||
352 | /* --- Look up the key type in the table --- */ | |
353 | ||
354 | for (ko = kgtab; *ko; ko++) { | |
355 | if (strcmp((*ko)->ty, k->type) == 0) | |
356 | goto tymatch; | |
357 | } | |
358 | dstr_putf(d, "private key `%s' has unknown type `%s'", t.buf, k->type); | |
359 | goto done_1; | |
360 | tymatch:; | |
361 | ||
362 | /* --- Load the key --- */ | |
363 | ||
d59d4fe9 | 364 | if ((e = (*ko)->loadpriv(*kd, &g, &x, &t)) != 0) { |
52c03a2a | 365 | dstr_putf(d, "error reading private key `%s': %s", t.buf, e); |
366 | goto done_1; | |
367 | } | |
368 | ||
369 | /* --- Check that the key is sensible --- */ | |
370 | ||
371 | if ((e = G_CHECK(g, &rand_global)) != 0) { | |
372 | dstr_putf(d, "bad group in private key `%s': %s", t.buf, e); | |
373 | goto done_1; | |
374 | } | |
375 | ||
b5c45da1 | 376 | /* --- Collect the algorithms --- */ |
377 | ||
378 | if ((e = algs_get(&a, &kf, k)) != 0 || | |
379 | (e = algs_check(&a, g)) != 0) { | |
380 | dstr_putf(d, "bad symmetric algorithm selection in private key `%s': %s", | |
381 | t.buf, e); | |
382 | goto done_1; | |
383 | } | |
384 | ||
52c03a2a | 385 | /* --- Good, we're happy --- * |
386 | * | |
387 | * Dodginess! We change the group over here, but don't free any old group | |
388 | * elements. This assumes that the new group is basically the same as the | |
389 | * old one, and will happily adopt the existing elements. If it isn't, | |
390 | * then we lose badly. Check this, then. | |
391 | */ | |
392 | ||
393 | if (gg) { | |
394 | if (!group_samep(g, gg)) { | |
395 | dstr_putf(d, "private key `%s' has different group", t.buf); | |
396 | goto done_1; | |
410c8acf | 397 | } |
52c03a2a | 398 | G_DESTROYGROUP(gg); |
410c8acf | 399 | } |
52c03a2a | 400 | if (kpriv) |
401 | mp_drop(kpriv); | |
402 | ||
9317aa92 MW |
403 | if (kpub) |
404 | G_DESTROY(g, kpub); | |
405 | kpub = G_CREATE(g); | |
406 | G_EXP(g, kpub, g->g, x); | |
de7bd20b | 407 | indexsz = mp_octets(g->r); |
9317aa92 | 408 | |
52c03a2a | 409 | /* --- Dump out the group --- */ |
410 | ||
411 | IF_TRACING(T_KEYMGMT, { | |
412 | trace(T_KEYMGMT, "keymgmt: extracted private key `%s'", t.buf); | |
413 | IF_TRACING(T_CRYPTO, { | |
414 | trace(T_CRYPTO, "crypto: r = %s", mpstr(g->r)); | |
415 | trace(T_CRYPTO, "crypto: h = %s", mpstr(g->h)); | |
416 | trace(T_CRYPTO, "crypto: x = %s", mpstr(x)); | |
b5c45da1 | 417 | trace(T_CRYPTO, "crypto: cipher = %s", a.c->name); |
418 | trace(T_CRYPTO, "crypto: mgf = %s", a.mgf->name); | |
419 | trace(T_CRYPTO, "crypto: hash = %s", a.h->name); | |
420 | trace(T_CRYPTO, "crypto: mac = %s/%lu", | |
421 | a.m->name, (unsigned long)a.tagsz * 8); | |
52c03a2a | 422 | }) |
423 | }) | |
424 | ||
425 | /* --- Success! --- */ | |
426 | ||
427 | gg = g; g = 0; | |
b5c45da1 | 428 | algs = a; |
52c03a2a | 429 | kpriv = x; x = 0; |
430 | rc = 0; | |
431 | ||
432 | /* --- Tidy up --- */ | |
433 | ||
434 | done_1: | |
435 | key_close(&kf); | |
436 | done_0: | |
437 | dstr_destroy(&t); | |
438 | if (x) mp_drop(x); | |
439 | if (g) G_DESTROYGROUP(g); | |
410c8acf | 440 | return (rc); |
441 | } | |
442 | ||
443 | /* --- @loadpub@ --- * | |
444 | * | |
445 | * Arguments: @dstr *d@ = string to write errors to | |
446 | * | |
447 | * Returns: Zero if OK, nonzero on error. | |
448 | * | |
449 | * Use: Reloads the public keyring. | |
450 | */ | |
451 | ||
452 | static int loadpub(dstr *d) | |
453 | { | |
454 | key_file *kf = CREATE(key_file); | |
455 | ||
456 | if (key_open(kf, kr_pub, KOPEN_READ, keymoan, 0)) { | |
457 | dstr_putf(d, "error reading public keyring `%s': %s", | |
458 | kr_pub, strerror(errno)); | |
459 | DESTROY(kf); | |
460 | return (-1); | |
461 | } | |
462 | kf_pub = kf; | |
463 | T( trace(T_KEYMGMT, "keymgmt: loaded public keyring `%s'", kr_pub); ) | |
464 | return (0); | |
465 | } | |
466 | ||
de014da6 | 467 | /* --- @km_reload@ --- * |
410c8acf | 468 | * |
469 | * Arguments: --- | |
470 | * | |
471 | * Returns: Zero if OK, nonzero to force reloading of keys. | |
472 | * | |
de014da6 | 473 | * Use: Checks the keyrings to see if they need reloading. |
410c8acf | 474 | */ |
475 | ||
de014da6 | 476 | int km_reload(void) |
410c8acf | 477 | { |
478 | dstr d = DSTR_INIT; | |
410c8acf | 479 | key_file *kf; |
480 | int reload = 0; | |
481 | ||
482 | /* --- Check the private key first --- */ | |
483 | ||
484 | if (fwatch_update(&w_priv, kr_priv)) { | |
485 | T( trace(T_KEYMGMT, "keymgmt: private keyring updated: reloading..."); ) | |
486 | DRESET(&d); | |
52c03a2a | 487 | if (loadpriv(&d)) |
f43df819 | 488 | a_warn("KEYMGMT", "bad-private-key", "%s", d.buf, A_END); |
52c03a2a | 489 | else |
410c8acf | 490 | reload = 1; |
410c8acf | 491 | } |
492 | ||
493 | /* --- Now check the public keys --- */ | |
494 | ||
495 | if (fwatch_update(&w_pub, kr_pub)) { | |
496 | T( trace(T_KEYMGMT, "keymgmt: public keyring updated: reloading..."); ) | |
497 | kf = kf_pub; | |
498 | DRESET(&d); | |
499 | if (loadpub(&d)) | |
f43df819 | 500 | a_warn("KEYMGMT", "bad-public-keyring", "%s", d.buf, A_END); |
410c8acf | 501 | else { |
502 | reload = 1; | |
503 | key_close(kf); | |
504 | DESTROY(kf); | |
505 | } | |
506 | } | |
507 | ||
508 | /* --- Done --- */ | |
509 | ||
510 | return (reload); | |
511 | } | |
512 | ||
513 | /* --- @km_init@ --- * | |
514 | * | |
515 | * Arguments: @const char *priv@ = private keyring file | |
516 | * @const char *pub@ = public keyring file | |
517 | * @const char *tag@ = tag to load | |
518 | * | |
519 | * Returns: --- | |
520 | * | |
521 | * Use: Initializes, and loads the private key. | |
522 | */ | |
523 | ||
524 | void km_init(const char *priv, const char *pub, const char *tag) | |
525 | { | |
526 | dstr d = DSTR_INIT; | |
b5c45da1 | 527 | const gchash *const *hh; |
410c8acf | 528 | |
529 | kr_priv = priv; | |
530 | kr_pub = pub; | |
531 | tag_priv = tag; | |
532 | fwatch_init(&w_priv, kr_priv); | |
533 | fwatch_init(&w_pub, kr_pub); | |
534 | ||
b5c45da1 | 535 | for (hh = ghashtab; *hh; hh++) { |
536 | if ((*hh)->hashsz > MAXHASHSZ) { | |
537 | die(EXIT_FAILURE, "INTERNAL ERROR: %s hash length %lu > MAXHASHSZ %d", | |
538 | (*hh)->name, (unsigned long)(*hh)->hashsz, MAXHASHSZ); | |
539 | } | |
540 | } | |
541 | ||
410c8acf | 542 | DRESET(&d); |
52c03a2a | 543 | if (loadpriv(&d)) |
410c8acf | 544 | die(EXIT_FAILURE, "%s", d.buf); |
410c8acf | 545 | if (loadpub(&d)) |
546 | die(EXIT_FAILURE, "%s", d.buf); | |
547 | } | |
548 | ||
549 | /* --- @km_getpubkey@ --- * | |
550 | * | |
551 | * Arguments: @const char *tag@ = public key tag to load | |
52c03a2a | 552 | * @ge *kpub@ = where to put the public key |
00e64b67 | 553 | * @time_t *t_exp@ = where to put the expiry time |
410c8acf | 554 | * |
555 | * Returns: Zero if OK, nonzero if it failed. | |
556 | * | |
557 | * Use: Fetches a public key from the keyring. | |
558 | */ | |
559 | ||
52c03a2a | 560 | int km_getpubkey(const char *tag, ge *kpub, time_t *t_exp) |
410c8acf | 561 | { |
00e64b67 | 562 | key *k; |
d59d4fe9 | 563 | key_data **kd; |
52c03a2a | 564 | dstr t = DSTR_INIT; |
565 | const kgops **ko; | |
566 | const char *e; | |
567 | group *g = 0; | |
568 | ge *p = 0; | |
b5c45da1 | 569 | algswitch a; |
52c03a2a | 570 | int rc = -1; |
571 | ||
572 | /* --- Find the key --- */ | |
573 | ||
574 | if (key_qtag(kf_pub, tag, &t, &k, &kd)) { | |
f43df819 | 575 | a_warn("KEYMGMT", "public-key", "%s", tag, "not-found", A_END); |
52c03a2a | 576 | goto done; |
577 | } | |
410c8acf | 578 | |
52c03a2a | 579 | /* --- Look up the key type in the table --- */ |
580 | ||
581 | for (ko = kgtab; *ko; ko++) { | |
582 | if (strcmp((*ko)->ty, k->type) == 0) | |
583 | goto tymatch; | |
584 | } | |
f43df819 MW |
585 | a_warn("KEYMGMT", |
586 | "public-key", "%s", t.buf, | |
587 | "unknown-type", "%s", k->type, | |
588 | A_END); | |
52c03a2a | 589 | goto done; |
590 | tymatch:; | |
591 | ||
592 | /* --- Load the key --- */ | |
593 | ||
d59d4fe9 | 594 | if ((e = (*ko)->loadpub(*kd, &g, &p, &t)) != 0) { |
f43df819 | 595 | a_warn("KEYMGMT", "public-key", "%s", t.buf, "bad", "%s", e, A_END); |
52c03a2a | 596 | goto done; |
597 | } | |
598 | ||
599 | /* --- Ensure that the group is correct --- * | |
600 | * | |
601 | * Dodginess! We assume that if this works, our global group is willing to | |
602 | * adopt this public element. Probably reasonable. | |
603 | */ | |
604 | ||
605 | if (!group_samep(gg, g)) { | |
f43df819 | 606 | a_warn("KEYMGMT", "public-key", "%s", t.buf, "incorrect-group", A_END); |
52c03a2a | 607 | goto done; |
608 | } | |
609 | ||
610 | /* --- Check the public group element --- */ | |
611 | ||
612 | if (group_check(gg, p)) { | |
f43df819 MW |
613 | a_warn("KEYMGMT", |
614 | "public-key", "%s", t.buf, | |
615 | "bad-public-group-element", | |
616 | A_END); | |
52c03a2a | 617 | goto done; |
410c8acf | 618 | } |
52c03a2a | 619 | |
b5c45da1 | 620 | /* --- Check the algorithms --- */ |
621 | ||
622 | if ((e = algs_get(&a, kf_pub, k)) != 0) { | |
f43df819 MW |
623 | a_warn("KEYMGMT", |
624 | "public-key", "%s", t.buf, | |
625 | "bad-algorithm-selection", e, | |
626 | A_END); | |
b5c45da1 | 627 | goto done; |
628 | } | |
3cdc3f3a | 629 | if (!algs_samep(&a, &algs)) { |
f43df819 MW |
630 | a_warn("KEYMGMT", |
631 | "public-key", "%s", t.buf, | |
632 | "algorithm-mismatch", | |
633 | A_END); | |
b5c45da1 | 634 | goto done; |
635 | } | |
636 | ||
52c03a2a | 637 | /* --- Dump the public key --- */ |
638 | ||
410c8acf | 639 | IF_TRACING(T_KEYMGMT, { |
52c03a2a | 640 | trace(T_KEYMGMT, "keymgmt: extracted public key `%s'", t.buf); |
641 | trace(T_CRYPTO, "crypto: p = %s", gestr(gg, p)); | |
410c8acf | 642 | }) |
52c03a2a | 643 | |
644 | /* --- OK, accept the public key --- */ | |
645 | ||
00e64b67 | 646 | *t_exp = k->exp; |
52c03a2a | 647 | G_COPY(gg, kpub, p); |
648 | rc = 0; | |
649 | ||
650 | /* --- Tidy up --- */ | |
651 | ||
652 | done: | |
653 | if (p) G_DESTROY(g, p); | |
654 | if (g) G_DESTROYGROUP(g); | |
655 | dstr_destroy(&t); | |
656 | return (rc); | |
410c8acf | 657 | } |
658 | ||
659 | /*----- That's all, folks -------------------------------------------------*/ |