Commit | Line | Data |
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410c8acf | 1 | /* -*-c-*- |
410c8acf | 2 | * |
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 | ||
101 | static const kgops kgdh_ops = { "tripe-dh", kgdh_priv, kgdh_pub }; | |
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 | ||
157 | static const kgops kgec_ops = { "tripe-ec", kgec_priv, kgec_pub }; | |
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 | |
318 | /* --- @loadpriv@ --- * | |
319 | * | |
320 | * Arguments: @dstr *d@ = string to write errors in | |
410c8acf | 321 | * |
322 | * Returns: Zero if OK, nonzero on error. | |
323 | * | |
324 | * Use: Loads the private key from its keyfile. | |
325 | */ | |
326 | ||
52c03a2a | 327 | static int loadpriv(dstr *d) |
410c8acf | 328 | { |
329 | key_file kf; | |
52c03a2a | 330 | key *k; |
d59d4fe9 | 331 | key_data **kd; |
52c03a2a | 332 | dstr t = DSTR_INIT; |
333 | group *g = 0; | |
334 | mp *x = 0; | |
335 | int rc = -1; | |
336 | const kgops **ko; | |
337 | const char *e; | |
b5c45da1 | 338 | algswitch a; |
52c03a2a | 339 | |
340 | /* --- Open the private key file --- */ | |
410c8acf | 341 | |
342 | if (key_open(&kf, kr_priv, KOPEN_READ, keymoan, 0)) { | |
343 | dstr_putf(d, "error reading private keyring `%s': %s", | |
344 | kr_priv, strerror(errno)); | |
52c03a2a | 345 | goto done_0; |
346 | } | |
347 | ||
348 | /* --- Find the private key --- */ | |
349 | ||
350 | if (key_qtag(&kf, tag_priv, &t, &k, &kd)) { | |
351 | dstr_putf(d, "private key `%s' not found in keyring `%s'", | |
352 | tag_priv, kr_priv); | |
353 | goto done_1; | |
354 | } | |
355 | ||
356 | /* --- Look up the key type in the table --- */ | |
357 | ||
358 | for (ko = kgtab; *ko; ko++) { | |
359 | if (strcmp((*ko)->ty, k->type) == 0) | |
360 | goto tymatch; | |
361 | } | |
362 | dstr_putf(d, "private key `%s' has unknown type `%s'", t.buf, k->type); | |
363 | goto done_1; | |
364 | tymatch:; | |
365 | ||
366 | /* --- Load the key --- */ | |
367 | ||
d59d4fe9 | 368 | if ((e = (*ko)->loadpriv(*kd, &g, &x, &t)) != 0) { |
52c03a2a | 369 | dstr_putf(d, "error reading private key `%s': %s", t.buf, e); |
370 | goto done_1; | |
371 | } | |
372 | ||
373 | /* --- Check that the key is sensible --- */ | |
374 | ||
375 | if ((e = G_CHECK(g, &rand_global)) != 0) { | |
376 | dstr_putf(d, "bad group in private key `%s': %s", t.buf, e); | |
377 | goto done_1; | |
378 | } | |
379 | ||
b5c45da1 | 380 | /* --- Collect the algorithms --- */ |
381 | ||
382 | if ((e = algs_get(&a, &kf, k)) != 0 || | |
383 | (e = algs_check(&a, g)) != 0) { | |
384 | dstr_putf(d, "bad symmetric algorithm selection in private key `%s': %s", | |
385 | t.buf, e); | |
386 | goto done_1; | |
387 | } | |
388 | ||
52c03a2a | 389 | /* --- Good, we're happy --- * |
390 | * | |
e04c2d50 | 391 | * Dodginess! We change the group over here, but don't free any old group |
52c03a2a | 392 | * elements. This assumes that the new group is basically the same as the |
393 | * old one, and will happily adopt the existing elements. If it isn't, | |
394 | * then we lose badly. Check this, then. | |
395 | */ | |
396 | ||
397 | if (gg) { | |
398 | if (!group_samep(g, gg)) { | |
399 | dstr_putf(d, "private key `%s' has different group", t.buf); | |
400 | goto done_1; | |
410c8acf | 401 | } |
52c03a2a | 402 | G_DESTROYGROUP(gg); |
410c8acf | 403 | } |
52c03a2a | 404 | if (kpriv) |
405 | mp_drop(kpriv); | |
406 | ||
9317aa92 MW |
407 | if (kpub) |
408 | G_DESTROY(g, kpub); | |
409 | kpub = G_CREATE(g); | |
410 | G_EXP(g, kpub, g->g, x); | |
de7bd20b | 411 | indexsz = mp_octets(g->r); |
9317aa92 | 412 | |
52c03a2a | 413 | /* --- Dump out the group --- */ |
414 | ||
415 | IF_TRACING(T_KEYMGMT, { | |
416 | trace(T_KEYMGMT, "keymgmt: extracted private key `%s'", t.buf); | |
417 | IF_TRACING(T_CRYPTO, { | |
418 | trace(T_CRYPTO, "crypto: r = %s", mpstr(g->r)); | |
419 | trace(T_CRYPTO, "crypto: h = %s", mpstr(g->h)); | |
420 | trace(T_CRYPTO, "crypto: x = %s", mpstr(x)); | |
b5c45da1 | 421 | trace(T_CRYPTO, "crypto: cipher = %s", a.c->name); |
422 | trace(T_CRYPTO, "crypto: mgf = %s", a.mgf->name); | |
423 | trace(T_CRYPTO, "crypto: hash = %s", a.h->name); | |
424 | trace(T_CRYPTO, "crypto: mac = %s/%lu", | |
425 | a.m->name, (unsigned long)a.tagsz * 8); | |
52c03a2a | 426 | }) |
427 | }) | |
428 | ||
429 | /* --- Success! --- */ | |
430 | ||
431 | gg = g; g = 0; | |
b5c45da1 | 432 | algs = a; |
52c03a2a | 433 | kpriv = x; x = 0; |
434 | rc = 0; | |
435 | ||
436 | /* --- Tidy up --- */ | |
437 | ||
438 | done_1: | |
439 | key_close(&kf); | |
440 | done_0: | |
441 | dstr_destroy(&t); | |
442 | if (x) mp_drop(x); | |
443 | if (g) G_DESTROYGROUP(g); | |
410c8acf | 444 | return (rc); |
445 | } | |
446 | ||
447 | /* --- @loadpub@ --- * | |
448 | * | |
449 | * Arguments: @dstr *d@ = string to write errors to | |
450 | * | |
451 | * Returns: Zero if OK, nonzero on error. | |
452 | * | |
453 | * Use: Reloads the public keyring. | |
454 | */ | |
455 | ||
456 | static int loadpub(dstr *d) | |
457 | { | |
458 | key_file *kf = CREATE(key_file); | |
459 | ||
460 | if (key_open(kf, kr_pub, KOPEN_READ, keymoan, 0)) { | |
461 | dstr_putf(d, "error reading public keyring `%s': %s", | |
462 | kr_pub, strerror(errno)); | |
463 | DESTROY(kf); | |
464 | return (-1); | |
465 | } | |
466 | kf_pub = kf; | |
467 | T( trace(T_KEYMGMT, "keymgmt: loaded public keyring `%s'", kr_pub); ) | |
468 | return (0); | |
469 | } | |
470 | ||
de014da6 | 471 | /* --- @km_reload@ --- * |
410c8acf | 472 | * |
473 | * Arguments: --- | |
474 | * | |
475 | * Returns: Zero if OK, nonzero to force reloading of keys. | |
476 | * | |
de014da6 | 477 | * Use: Checks the keyrings to see if they need reloading. |
410c8acf | 478 | */ |
479 | ||
de014da6 | 480 | int km_reload(void) |
410c8acf | 481 | { |
482 | dstr d = DSTR_INIT; | |
410c8acf | 483 | key_file *kf; |
484 | int reload = 0; | |
485 | ||
486 | /* --- Check the private key first --- */ | |
487 | ||
488 | if (fwatch_update(&w_priv, kr_priv)) { | |
489 | T( trace(T_KEYMGMT, "keymgmt: private keyring updated: reloading..."); ) | |
490 | DRESET(&d); | |
52c03a2a | 491 | if (loadpriv(&d)) |
f43df819 | 492 | a_warn("KEYMGMT", "bad-private-key", "%s", d.buf, A_END); |
52c03a2a | 493 | else |
410c8acf | 494 | reload = 1; |
410c8acf | 495 | } |
496 | ||
497 | /* --- Now check the public keys --- */ | |
498 | ||
499 | if (fwatch_update(&w_pub, kr_pub)) { | |
500 | T( trace(T_KEYMGMT, "keymgmt: public keyring updated: reloading..."); ) | |
501 | kf = kf_pub; | |
502 | DRESET(&d); | |
503 | if (loadpub(&d)) | |
f43df819 | 504 | a_warn("KEYMGMT", "bad-public-keyring", "%s", d.buf, A_END); |
410c8acf | 505 | else { |
506 | reload = 1; | |
507 | key_close(kf); | |
508 | DESTROY(kf); | |
509 | } | |
510 | } | |
511 | ||
512 | /* --- Done --- */ | |
513 | ||
514 | return (reload); | |
515 | } | |
516 | ||
517 | /* --- @km_init@ --- * | |
518 | * | |
519 | * Arguments: @const char *priv@ = private keyring file | |
520 | * @const char *pub@ = public keyring file | |
521 | * @const char *tag@ = tag to load | |
522 | * | |
523 | * Returns: --- | |
524 | * | |
525 | * Use: Initializes, and loads the private key. | |
526 | */ | |
527 | ||
528 | void km_init(const char *priv, const char *pub, const char *tag) | |
529 | { | |
530 | dstr d = DSTR_INIT; | |
b5c45da1 | 531 | const gchash *const *hh; |
410c8acf | 532 | |
533 | kr_priv = priv; | |
534 | kr_pub = pub; | |
535 | tag_priv = tag; | |
536 | fwatch_init(&w_priv, kr_priv); | |
537 | fwatch_init(&w_pub, kr_pub); | |
538 | ||
b5c45da1 | 539 | for (hh = ghashtab; *hh; hh++) { |
540 | if ((*hh)->hashsz > MAXHASHSZ) { | |
541 | die(EXIT_FAILURE, "INTERNAL ERROR: %s hash length %lu > MAXHASHSZ %d", | |
542 | (*hh)->name, (unsigned long)(*hh)->hashsz, MAXHASHSZ); | |
543 | } | |
544 | } | |
545 | ||
410c8acf | 546 | DRESET(&d); |
52c03a2a | 547 | if (loadpriv(&d)) |
410c8acf | 548 | die(EXIT_FAILURE, "%s", d.buf); |
410c8acf | 549 | if (loadpub(&d)) |
550 | die(EXIT_FAILURE, "%s", d.buf); | |
551 | } | |
552 | ||
553 | /* --- @km_getpubkey@ --- * | |
554 | * | |
555 | * Arguments: @const char *tag@ = public key tag to load | |
52c03a2a | 556 | * @ge *kpub@ = where to put the public key |
00e64b67 | 557 | * @time_t *t_exp@ = where to put the expiry time |
410c8acf | 558 | * |
559 | * Returns: Zero if OK, nonzero if it failed. | |
560 | * | |
561 | * Use: Fetches a public key from the keyring. | |
562 | */ | |
563 | ||
52c03a2a | 564 | int km_getpubkey(const char *tag, ge *kpub, time_t *t_exp) |
410c8acf | 565 | { |
00e64b67 | 566 | key *k; |
d59d4fe9 | 567 | key_data **kd; |
52c03a2a | 568 | dstr t = DSTR_INIT; |
569 | const kgops **ko; | |
570 | const char *e; | |
571 | group *g = 0; | |
572 | ge *p = 0; | |
b5c45da1 | 573 | algswitch a; |
52c03a2a | 574 | int rc = -1; |
575 | ||
576 | /* --- Find the key --- */ | |
577 | ||
578 | if (key_qtag(kf_pub, tag, &t, &k, &kd)) { | |
f43df819 | 579 | a_warn("KEYMGMT", "public-key", "%s", tag, "not-found", A_END); |
52c03a2a | 580 | goto done; |
581 | } | |
410c8acf | 582 | |
52c03a2a | 583 | /* --- Look up the key type in the table --- */ |
584 | ||
585 | for (ko = kgtab; *ko; ko++) { | |
586 | if (strcmp((*ko)->ty, k->type) == 0) | |
587 | goto tymatch; | |
588 | } | |
f43df819 MW |
589 | a_warn("KEYMGMT", |
590 | "public-key", "%s", t.buf, | |
591 | "unknown-type", "%s", k->type, | |
592 | A_END); | |
52c03a2a | 593 | goto done; |
594 | tymatch:; | |
595 | ||
596 | /* --- Load the key --- */ | |
597 | ||
d59d4fe9 | 598 | if ((e = (*ko)->loadpub(*kd, &g, &p, &t)) != 0) { |
f43df819 | 599 | a_warn("KEYMGMT", "public-key", "%s", t.buf, "bad", "%s", e, A_END); |
52c03a2a | 600 | goto done; |
601 | } | |
602 | ||
603 | /* --- Ensure that the group is correct --- * | |
604 | * | |
e04c2d50 | 605 | * Dodginess! We assume that if this works, our global group is willing to |
52c03a2a | 606 | * adopt this public element. Probably reasonable. |
607 | */ | |
608 | ||
609 | if (!group_samep(gg, g)) { | |
f43df819 | 610 | a_warn("KEYMGMT", "public-key", "%s", t.buf, "incorrect-group", A_END); |
52c03a2a | 611 | goto done; |
612 | } | |
613 | ||
614 | /* --- Check the public group element --- */ | |
615 | ||
616 | if (group_check(gg, p)) { | |
f43df819 MW |
617 | a_warn("KEYMGMT", |
618 | "public-key", "%s", t.buf, | |
619 | "bad-public-group-element", | |
620 | A_END); | |
52c03a2a | 621 | goto done; |
410c8acf | 622 | } |
52c03a2a | 623 | |
b5c45da1 | 624 | /* --- Check the algorithms --- */ |
625 | ||
626 | if ((e = algs_get(&a, kf_pub, k)) != 0) { | |
f43df819 MW |
627 | a_warn("KEYMGMT", |
628 | "public-key", "%s", t.buf, | |
629 | "bad-algorithm-selection", e, | |
630 | A_END); | |
b5c45da1 | 631 | goto done; |
632 | } | |
3cdc3f3a | 633 | if (!algs_samep(&a, &algs)) { |
f43df819 MW |
634 | a_warn("KEYMGMT", |
635 | "public-key", "%s", t.buf, | |
636 | "algorithm-mismatch", | |
637 | A_END); | |
b5c45da1 | 638 | goto done; |
639 | } | |
640 | ||
52c03a2a | 641 | /* --- Dump the public key --- */ |
642 | ||
410c8acf | 643 | IF_TRACING(T_KEYMGMT, { |
52c03a2a | 644 | trace(T_KEYMGMT, "keymgmt: extracted public key `%s'", t.buf); |
645 | trace(T_CRYPTO, "crypto: p = %s", gestr(gg, p)); | |
410c8acf | 646 | }) |
52c03a2a | 647 | |
648 | /* --- OK, accept the public key --- */ | |
649 | ||
00e64b67 | 650 | *t_exp = k->exp; |
52c03a2a | 651 | G_COPY(gg, kpub, p); |
652 | rc = 0; | |
653 | ||
654 | /* --- Tidy up --- */ | |
655 | ||
656 | done: | |
657 | if (p) G_DESTROY(g, p); | |
658 | if (g) G_DESTROYGROUP(g); | |
659 | dstr_destroy(&t); | |
660 | return (rc); | |
410c8acf | 661 | } |
662 | ||
663 | /*----- That's all, folks -------------------------------------------------*/ |