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; | |
4d36660a MW |
49 | int (*loadpriv)(key_data *, group **, mp **, dstr *, dstr *); |
50 | int (*loadpub)(key_data *, group **, ge **, dstr *, dstr *); | |
52c03a2a | 51 | } kgops; |
52 | ||
53 | /* --- Diffie-Hellman --- */ | |
54 | ||
4d36660a | 55 | static int kgdh_priv(key_data *kd, group **g, mp **x, dstr *t, dstr *e) |
52c03a2a | 56 | { |
57 | key_packstruct kps[DH_PRIVFETCHSZ]; | |
58 | key_packdef *kp; | |
59 | dh_priv dp; | |
52c03a2a | 60 | int rc; |
61 | ||
62 | kp = key_fetchinit(dh_privfetch, kps, &dp); | |
63 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
4d36660a MW |
64 | a_format(e, "unpack-failed", "%s", key_strerror(rc), A_END); |
65 | goto fail_0; | |
52c03a2a | 66 | } |
67 | *g = group_prime(&dp.dp); | |
68 | *x = MP_COPY(dp.x); | |
4d36660a MW |
69 | rc = 0; |
70 | goto done; | |
71 | fail_0: | |
72 | rc = -1; | |
52c03a2a | 73 | done: |
74 | key_fetchdone(kp); | |
4d36660a | 75 | return (rc); |
52c03a2a | 76 | } |
77 | ||
4d36660a | 78 | static int kgdh_pub(key_data *kd, group **g, ge **p, dstr *t, dstr *e) |
52c03a2a | 79 | { |
80 | key_packstruct kps[DH_PUBFETCHSZ]; | |
81 | key_packdef *kp; | |
82 | dh_pub dp; | |
52c03a2a | 83 | int rc; |
84 | ||
85 | kp = key_fetchinit(dh_pubfetch, kps, &dp); | |
86 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
4d36660a MW |
87 | a_format(e, "unpack-failed", "%s", key_strerror(rc), A_END); |
88 | goto fail_0; | |
52c03a2a | 89 | } |
90 | *g = group_prime(&dp.dp); | |
91 | *p = G_CREATE(*g); | |
92 | if (G_FROMINT(*g, *p, dp.y)) { | |
4d36660a MW |
93 | a_format(e, "bad-public-vector", A_END); |
94 | goto fail_1; | |
52c03a2a | 95 | } |
4d36660a MW |
96 | rc = 0; |
97 | goto done; | |
98 | fail_1: | |
99 | G_DESTROY(*g, *p); | |
100 | G_DESTROYGROUP(*g); | |
101 | fail_0: | |
102 | rc = -1; | |
52c03a2a | 103 | done: |
104 | key_fetchdone(kp); | |
4d36660a | 105 | return (rc); |
52c03a2a | 106 | } |
107 | ||
fc5f4823 | 108 | static const kgops kgdh_ops = { "dh", kgdh_priv, kgdh_pub }; |
52c03a2a | 109 | |
110 | /* --- Elliptic curve --- */ | |
111 | ||
4d36660a | 112 | static int kgec_priv(key_data *kd, group **g, mp **x, dstr *t, dstr *e) |
52c03a2a | 113 | { |
114 | key_packstruct kps[EC_PRIVFETCHSZ]; | |
115 | key_packdef *kp; | |
116 | ec_priv ep; | |
117 | ec_info ei; | |
4d36660a | 118 | const char *err; |
52c03a2a | 119 | int rc; |
120 | ||
121 | kp = key_fetchinit(ec_privfetch, kps, &ep); | |
122 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
4d36660a MW |
123 | a_format(e, "unpack-failed", "%s", key_strerror(rc), A_END); |
124 | goto fail_0; | |
125 | } | |
126 | if ((err = ec_getinfo(&ei, ep.cstr)) != 0) { | |
127 | a_format(e, "decode-failed", "%s", err, A_END); | |
128 | goto fail_0; | |
52c03a2a | 129 | } |
52c03a2a | 130 | *g = group_ec(&ei); |
131 | *x = MP_COPY(ep.x); | |
4d36660a MW |
132 | rc = 0; |
133 | goto done; | |
134 | fail_0: | |
135 | rc = -1; | |
52c03a2a | 136 | done: |
137 | key_fetchdone(kp); | |
4d36660a | 138 | return (rc); |
52c03a2a | 139 | } |
140 | ||
4d36660a | 141 | static int kgec_pub(key_data *kd, group **g, ge **p, dstr *t, dstr *e) |
52c03a2a | 142 | { |
143 | key_packstruct kps[EC_PUBFETCHSZ]; | |
144 | key_packdef *kp; | |
145 | ec_pub ep; | |
146 | ec_info ei; | |
4d36660a | 147 | const char *err; |
52c03a2a | 148 | int rc; |
149 | ||
150 | kp = key_fetchinit(ec_pubfetch, kps, &ep); | |
151 | if ((rc = key_unpack(kp, kd, t)) != 0) { | |
4d36660a MW |
152 | a_format(e, "unpack-failed", "%s", key_strerror(rc), A_END); |
153 | goto fail_0; | |
154 | } | |
155 | if ((err = ec_getinfo(&ei, ep.cstr)) != 0) { | |
156 | a_format(e, "decode-failed", "%s", err, A_END); | |
157 | goto fail_0; | |
52c03a2a | 158 | } |
52c03a2a | 159 | *g = group_ec(&ei); |
160 | *p = G_CREATE(*g); | |
161 | if (G_FROMEC(*g, *p, &ep.p)) { | |
4d36660a MW |
162 | a_format(e, "bad-public-vector", A_END); |
163 | goto fail_1; | |
52c03a2a | 164 | } |
4d36660a MW |
165 | rc = 0; |
166 | goto done; | |
167 | fail_1: | |
168 | G_DESTROY(*g, *p); | |
169 | G_DESTROYGROUP(*g); | |
170 | fail_0: | |
171 | rc = -1; | |
52c03a2a | 172 | done: |
173 | key_fetchdone(kp); | |
4d36660a | 174 | return (rc); |
52c03a2a | 175 | } |
176 | ||
fc5f4823 | 177 | static const kgops kgec_ops = { "ec", kgec_priv, kgec_pub }; |
52c03a2a | 178 | |
179 | /* --- Table of supported key types --- */ | |
180 | ||
181 | static const kgops *kgtab[] = { &kgdh_ops, &kgec_ops, 0 }; | |
182 | ||
b5c45da1 | 183 | /*----- Algswitch stuff ---------------------------------------------------*/ |
184 | ||
185 | /* --- @algs_get@ --- * | |
186 | * | |
187 | * Arguments: @algswitch *a@ = where to put the algorithms | |
4d36660a MW |
188 | * @dstr *e@ = where to write errror tokens |
189 | * @key_file *kf@ = key file | |
b5c45da1 | 190 | * @key *k@ = key to inspect |
191 | * | |
4d36660a | 192 | * Returns: Zero if OK; nonzero on error. |
b5c45da1 | 193 | * |
194 | * Use: Extracts an algorithm choice from a key. | |
195 | */ | |
196 | ||
4d36660a | 197 | static int algs_get(algswitch *a, dstr *e, key_file *kf, key *k) |
b5c45da1 | 198 | { |
199 | const char *p; | |
4d36660a | 200 | char *q, *qq; |
b5c45da1 | 201 | dstr d = DSTR_INIT; |
4d36660a | 202 | int rc = -1; |
b5c45da1 | 203 | |
4d36660a | 204 | /* --- Symmetric encryption for bulk data --- */ |
b5c45da1 | 205 | |
4d36660a MW |
206 | if ((p = key_getattr(kf, k, "cipher")) == 0) p = "blowfish-cbc"; |
207 | if ((a->c = gcipher_byname(p)) == 0) { | |
208 | a_format(e, "unknown-cipher", "%s", p, A_END); | |
209 | goto done; | |
210 | } | |
211 | ||
212 | /* --- Hash function --- */ | |
213 | ||
214 | if ((p = key_getattr(kf, k, "hash")) == 0) p = "rmd160"; | |
215 | if ((a->h = ghash_byname(p)) == 0) { | |
216 | a_format(e, "unknown-hash", "%s", p, A_END); | |
217 | goto done; | |
218 | } | |
b5c45da1 | 219 | |
4d36660a | 220 | /* --- Symmetric encryption for key derivation --- */ |
b5c45da1 | 221 | |
74ee77cb | 222 | if ((p = key_getattr(kf, k, "mgf")) == 0) { |
b5c45da1 | 223 | dstr_reset(&d); |
74ee77cb | 224 | dstr_putf(&d, "%s-mgf", a->h->name); |
b5c45da1 | 225 | p = d.buf; |
226 | } | |
4d36660a MW |
227 | if ((a->mgf = gcipher_byname(p)) == 0) { |
228 | a_format(e, "unknown-mgf-cipher", "%s", p, A_END); | |
229 | goto done; | |
230 | } | |
231 | ||
232 | /* --- Message authentication for bulk data --- */ | |
b5c45da1 | 233 | |
234 | if ((p = key_getattr(kf, k, "mac")) != 0) { | |
235 | dstr_reset(&d); | |
236 | dstr_puts(&d, p); | |
237 | if ((q = strchr(d.buf, '/')) != 0) | |
238 | *q++ = 0; | |
4d36660a MW |
239 | if ((a->m = gmac_byname(d.buf)) == 0) { |
240 | a_format(e, "unknown-mac", "%s", d.buf, A_END); | |
241 | goto done; | |
242 | } | |
b5c45da1 | 243 | if (!q) |
244 | a->tagsz = a->m->hashsz; | |
245 | else { | |
4d36660a MW |
246 | unsigned long n = strtoul(q, &qq, 0); |
247 | if (*qq) { | |
248 | a_format(e, "bad-tag-length-string", "%s", q, A_END); | |
249 | goto done; | |
250 | } | |
251 | if (n%8 || n/8 > a->m->hashsz) { | |
252 | a_format(e, "bad-tag-length", "%lu", n, A_END); | |
253 | goto done; | |
254 | } | |
b5c45da1 | 255 | a->tagsz = n/8; |
256 | } | |
257 | } else { | |
258 | dstr_reset(&d); | |
259 | dstr_putf(&d, "%s-hmac", a->h->name); | |
4d36660a MW |
260 | if ((a->m = gmac_byname(d.buf)) == 0) { |
261 | a_format(e, "no-hmac-for-hash", "%s", a->h->name, A_END); | |
262 | goto done; | |
263 | } | |
b5c45da1 | 264 | a->tagsz = a->h->hashsz/2; |
265 | } | |
266 | ||
4d36660a | 267 | rc = 0; |
b5c45da1 | 268 | done: |
269 | dstr_destroy(&d); | |
4d36660a | 270 | return (rc); |
b5c45da1 | 271 | } |
272 | ||
273 | /* --- @algs_check@ --- * | |
274 | * | |
275 | * Arguments: @algswitch *a@ = a choice of algorithms | |
4d36660a | 276 | * @dstr *e@ = where to write error tokens |
b5c45da1 | 277 | * @const group *g@ = the group we're working in |
278 | * | |
4d36660a | 279 | * Returns: Zero if OK; nonzero on error. |
b5c45da1 | 280 | * |
281 | * Use: Checks an algorithm choice for sensibleness. This also | |
282 | * derives some useful information from the choices, and you | |
283 | * must call this before committing the algorithm selection | |
284 | * for use by @keyset@ functions. | |
285 | */ | |
286 | ||
4d36660a | 287 | static int algs_check(algswitch *a, dstr *e, const group *g) |
b5c45da1 | 288 | { |
289 | /* --- Derive the key sizes --- * | |
290 | * | |
291 | * Must ensure that we have non-empty keys. This isn't ideal, but it | |
383a9d71 MW |
292 | * provides a handy sanity check. Also must be based on a 64- or 128-bit |
293 | * block cipher or we can't do the data expiry properly. | |
b5c45da1 | 294 | */ |
295 | ||
296 | a->hashsz = a->h->hashsz; | |
4d36660a MW |
297 | if ((a->cksz = keysz(a->hashsz, a->c->keysz)) == 0) { |
298 | a_format(e, "cipher", "%s", a->c->name, | |
299 | "no-key-size", "%lu", (unsigned long)a->hashsz, | |
300 | A_END); | |
301 | return (-1); | |
302 | } | |
303 | if ((a->mksz = keysz(a->hashsz, a->m->keysz)) == 0) { | |
304 | a_format(e, "mac", "%s", a->m->name, | |
305 | "no-key-size", "%lu", (unsigned long)a->hashsz, | |
306 | A_END); | |
307 | return (-1); | |
308 | } | |
b5c45da1 | 309 | |
383a9d71 MW |
310 | /* --- Derive the data limit --- */ |
311 | ||
312 | if (a->c->blksz < 16) a->expsz = MEG(64); | |
313 | else a->expsz = MEG(2048); | |
314 | ||
b5c45da1 | 315 | /* --- Ensure the MGF accepts hashes as keys --- */ |
316 | ||
4d36660a MW |
317 | if (keysz(a->hashsz, a->mgf->keysz) != a->hashsz) { |
318 | a_format(e, "mgf", "%s", a->mgf->name, | |
319 | "restrictive-key-schedule", | |
320 | A_END); | |
321 | return (-1); | |
322 | } | |
b5c45da1 | 323 | |
324 | /* --- All ship-shape and Bristol-fashion --- */ | |
325 | ||
326 | return (0); | |
327 | } | |
328 | ||
329 | /* --- @algs_samep@ --- * | |
330 | * | |
331 | * Arguments: @const algswitch *a, *aa@ = two algorithm selections | |
332 | * | |
333 | * Returns: Nonzero if the two selections are the same. | |
334 | * | |
335 | * Use: Checks sameness of algorithm selections: used to ensure that | |
336 | * peers are using sensible algorithms. | |
337 | */ | |
338 | ||
339 | static int algs_samep(const algswitch *a, const algswitch *aa) | |
340 | { | |
341 | return (a->c == aa->c && a->mgf == aa->mgf && a->h == aa->h && | |
342 | a->m == aa->m && a->tagsz == aa->tagsz); | |
343 | } | |
344 | ||
410c8acf | 345 | /*----- Main code ---------------------------------------------------------*/ |
346 | ||
347 | /* --- @keymoan@ --- * | |
348 | * | |
56814747 | 349 | * Arguments: @const char *file@ = name of the file |
e04c2d50 MW |
350 | * @int line@ = line number in file |
351 | * @const char *msg@ = error message | |
4d36660a | 352 | * @void *p@ = argument pointer (indicates which keyring) |
410c8acf | 353 | * |
e04c2d50 | 354 | * Returns: --- |
410c8acf | 355 | * |
e04c2d50 | 356 | * Use: Reports an error message about loading a key file. |
410c8acf | 357 | */ |
358 | ||
359 | static void keymoan(const char *file, int line, const char *msg, void *p) | |
f43df819 | 360 | { |
4d36660a MW |
361 | const char *kind = p; |
362 | ||
363 | if (!line) { | |
364 | a_warn("KEYMGMT", "%s-keyring", kind, "%s", file, | |
365 | "io-error", "?ERRNO", A_END); | |
366 | } else { | |
367 | a_warn("KEYMGMT", "%s-keyring", kind, "%s", file, "line", "%d", line, | |
368 | "%s", msg, A_END); | |
369 | } | |
f43df819 | 370 | } |
410c8acf | 371 | |
fc5f4823 MW |
372 | /* --- @keykg@ --- * |
373 | * | |
374 | * Arguments: @key_file *kf@ = pointer to key file | |
375 | * @key *k@ = pointer to key | |
376 | * @const char **tyr@ = where to put the type string | |
377 | * | |
378 | * Returns: Pointer to indicated key-group options, or null. | |
379 | * | |
380 | * Use: Looks up a key's group indicator and tries to find a matching | |
381 | * table entry. | |
382 | */ | |
383 | ||
384 | static const kgops *keykg(key_file *kf, key *k, const char **tyr) | |
385 | { | |
386 | const char *ty; | |
387 | const kgops **ko; | |
388 | ||
389 | /* --- Look up the key type in the table --- * | |
390 | * | |
391 | * There are several places to look for this. The most obvious is the | |
392 | * `kx-group' key attribute. But there's also the key type itself. | |
393 | */ | |
394 | ||
395 | ty = key_getattr(kf, k, "kx-group"); | |
396 | if (!ty && strncmp(k->type, "tripe-", 6) == 0) ty = k->type + 6; | |
397 | if (!ty) ty = "dh"; | |
398 | if (tyr) *tyr = ty; | |
399 | ||
400 | for (ko = kgtab; *ko; ko++) { | |
401 | if (strcmp((*ko)->ty, ty) == 0) | |
402 | return (*ko); | |
403 | } | |
404 | return (0); | |
405 | } | |
406 | ||
410c8acf | 407 | /* --- @loadpriv@ --- * |
408 | * | |
409 | * Arguments: @dstr *d@ = string to write errors in | |
410c8acf | 410 | * |
411 | * Returns: Zero if OK, nonzero on error. | |
412 | * | |
413 | * Use: Loads the private key from its keyfile. | |
414 | */ | |
415 | ||
4d36660a | 416 | static int loadpriv(void) |
410c8acf | 417 | { |
418 | key_file kf; | |
52c03a2a | 419 | key *k; |
d59d4fe9 | 420 | key_data **kd; |
52c03a2a | 421 | dstr t = DSTR_INIT; |
4d36660a | 422 | dstr e = DSTR_INIT; |
52c03a2a | 423 | group *g = 0; |
424 | mp *x = 0; | |
425 | int rc = -1; | |
fc5f4823 | 426 | const kgops *ko; |
4d36660a | 427 | const char *err, *tag, *ty; |
b5c45da1 | 428 | algswitch a; |
52c03a2a | 429 | |
430 | /* --- Open the private key file --- */ | |
410c8acf | 431 | |
4d36660a | 432 | if (key_open(&kf, kr_priv, KOPEN_READ, keymoan, "private")) |
52c03a2a | 433 | goto done_0; |
52c03a2a | 434 | |
435 | /* --- Find the private key --- */ | |
436 | ||
fc5f4823 MW |
437 | if (tag_priv ? |
438 | key_qtag(&kf, tag = tag_priv, &t, &k, &kd) : | |
439 | key_qtag(&kf, tag = "tripe", &t, &k, &kd) && | |
e2fe2afd | 440 | key_qtag(&kf, tag = "tripe-dh", &t, &k, &kd)) { |
4d36660a MW |
441 | a_warn("KEYMGMT", "private-keyring", "%s", kr_priv, |
442 | "key-not-found", "%s", tag, A_END); | |
52c03a2a | 443 | goto done_1; |
444 | } | |
445 | ||
446 | /* --- Look up the key type in the table --- */ | |
447 | ||
fc5f4823 | 448 | if ((ko = keykg(&kf, k, &ty)) == 0) { |
4d36660a MW |
449 | a_warn("KEYMGMT", "private-keyring", |
450 | "%s", kr_priv, "key", "%s", t.buf, | |
451 | "unknown-group-type", "%s", ty, A_END); | |
fc5f4823 | 452 | goto done_1; |
52c03a2a | 453 | } |
52c03a2a | 454 | |
455 | /* --- Load the key --- */ | |
456 | ||
4d36660a MW |
457 | if (ko->loadpriv(*kd, &g, &x, &t, &e)) { |
458 | a_warn("KEYMGMT", "private-keyring", | |
459 | "%s", kr_priv, "key", "%s", t.buf, | |
460 | "*%s", e.buf, A_END); | |
52c03a2a | 461 | goto done_1; |
462 | } | |
463 | ||
464 | /* --- Check that the key is sensible --- */ | |
465 | ||
4d36660a MW |
466 | if ((err = G_CHECK(g, &rand_global)) != 0) { |
467 | a_warn("KEYMGMT", "private-keyring", | |
468 | "%s", kr_priv, "key", "%s", t.buf, | |
469 | "bad-group", "%s", err, A_END); | |
52c03a2a | 470 | goto done_1; |
471 | } | |
472 | ||
b5c45da1 | 473 | /* --- Collect the algorithms --- */ |
474 | ||
4d36660a MW |
475 | if (algs_get(&a, &e, &kf, k) || |
476 | algs_check(&a, &e, g)) { | |
477 | a_warn("KEYMGMT", "private-keyring", | |
478 | "%s", kr_priv, "key", "%s", t.buf, | |
479 | "*%s", e.buf, A_END); | |
b5c45da1 | 480 | goto done_1; |
481 | } | |
482 | ||
52c03a2a | 483 | /* --- Good, we're happy --- * |
484 | * | |
e04c2d50 | 485 | * Dodginess! We change the group over here, but don't free any old group |
52c03a2a | 486 | * elements. This assumes that the new group is basically the same as the |
487 | * old one, and will happily adopt the existing elements. If it isn't, | |
488 | * then we lose badly. Check this, then. | |
489 | */ | |
490 | ||
491 | if (gg) { | |
492 | if (!group_samep(g, gg)) { | |
4d36660a MW |
493 | a_warn("KEYMGMT", "private-keyring", |
494 | "%s", kr_priv, "key", "%s", t.buf, | |
495 | "changed-group", A_END); | |
52c03a2a | 496 | goto done_1; |
410c8acf | 497 | } |
52c03a2a | 498 | G_DESTROYGROUP(gg); |
410c8acf | 499 | } |
52c03a2a | 500 | if (kpriv) |
501 | mp_drop(kpriv); | |
502 | ||
9317aa92 MW |
503 | if (kpub) |
504 | G_DESTROY(g, kpub); | |
505 | kpub = G_CREATE(g); | |
506 | G_EXP(g, kpub, g->g, x); | |
de7bd20b | 507 | indexsz = mp_octets(g->r); |
9317aa92 | 508 | |
52c03a2a | 509 | /* --- Dump out the group --- */ |
510 | ||
511 | IF_TRACING(T_KEYMGMT, { | |
512 | trace(T_KEYMGMT, "keymgmt: extracted private key `%s'", t.buf); | |
513 | IF_TRACING(T_CRYPTO, { | |
514 | trace(T_CRYPTO, "crypto: r = %s", mpstr(g->r)); | |
515 | trace(T_CRYPTO, "crypto: h = %s", mpstr(g->h)); | |
516 | trace(T_CRYPTO, "crypto: x = %s", mpstr(x)); | |
b5c45da1 | 517 | trace(T_CRYPTO, "crypto: cipher = %s", a.c->name); |
518 | trace(T_CRYPTO, "crypto: mgf = %s", a.mgf->name); | |
519 | trace(T_CRYPTO, "crypto: hash = %s", a.h->name); | |
520 | trace(T_CRYPTO, "crypto: mac = %s/%lu", | |
521 | a.m->name, (unsigned long)a.tagsz * 8); | |
52c03a2a | 522 | }) |
523 | }) | |
524 | ||
525 | /* --- Success! --- */ | |
526 | ||
527 | gg = g; g = 0; | |
b5c45da1 | 528 | algs = a; |
52c03a2a | 529 | kpriv = x; x = 0; |
530 | rc = 0; | |
531 | ||
532 | /* --- Tidy up --- */ | |
533 | ||
534 | done_1: | |
535 | key_close(&kf); | |
536 | done_0: | |
537 | dstr_destroy(&t); | |
4d36660a | 538 | dstr_destroy(&e); |
52c03a2a | 539 | if (x) mp_drop(x); |
540 | if (g) G_DESTROYGROUP(g); | |
410c8acf | 541 | return (rc); |
542 | } | |
543 | ||
544 | /* --- @loadpub@ --- * | |
545 | * | |
546 | * Arguments: @dstr *d@ = string to write errors to | |
547 | * | |
548 | * Returns: Zero if OK, nonzero on error. | |
549 | * | |
550 | * Use: Reloads the public keyring. | |
551 | */ | |
552 | ||
4d36660a | 553 | static int loadpub(void) |
410c8acf | 554 | { |
555 | key_file *kf = CREATE(key_file); | |
556 | ||
4d36660a | 557 | if (key_open(kf, kr_pub, KOPEN_READ, keymoan, "public")) { |
410c8acf | 558 | DESTROY(kf); |
559 | return (-1); | |
560 | } | |
561 | kf_pub = kf; | |
562 | T( trace(T_KEYMGMT, "keymgmt: loaded public keyring `%s'", kr_pub); ) | |
563 | return (0); | |
564 | } | |
565 | ||
de014da6 | 566 | /* --- @km_reload@ --- * |
410c8acf | 567 | * |
568 | * Arguments: --- | |
569 | * | |
570 | * Returns: Zero if OK, nonzero to force reloading of keys. | |
571 | * | |
de014da6 | 572 | * Use: Checks the keyrings to see if they need reloading. |
410c8acf | 573 | */ |
574 | ||
de014da6 | 575 | int km_reload(void) |
410c8acf | 576 | { |
410c8acf | 577 | key_file *kf; |
578 | int reload = 0; | |
579 | ||
580 | /* --- Check the private key first --- */ | |
581 | ||
582 | if (fwatch_update(&w_priv, kr_priv)) { | |
583 | T( trace(T_KEYMGMT, "keymgmt: private keyring updated: reloading..."); ) | |
4d36660a | 584 | if (!loadpriv()) |
410c8acf | 585 | reload = 1; |
410c8acf | 586 | } |
587 | ||
588 | /* --- Now check the public keys --- */ | |
589 | ||
590 | if (fwatch_update(&w_pub, kr_pub)) { | |
591 | T( trace(T_KEYMGMT, "keymgmt: public keyring updated: reloading..."); ) | |
592 | kf = kf_pub; | |
4d36660a | 593 | if (!loadpub()) { |
410c8acf | 594 | reload = 1; |
595 | key_close(kf); | |
596 | DESTROY(kf); | |
597 | } | |
598 | } | |
599 | ||
600 | /* --- Done --- */ | |
601 | ||
602 | return (reload); | |
603 | } | |
604 | ||
605 | /* --- @km_init@ --- * | |
606 | * | |
607 | * Arguments: @const char *priv@ = private keyring file | |
608 | * @const char *pub@ = public keyring file | |
609 | * @const char *tag@ = tag to load | |
610 | * | |
611 | * Returns: --- | |
612 | * | |
613 | * Use: Initializes, and loads the private key. | |
614 | */ | |
615 | ||
616 | void km_init(const char *priv, const char *pub, const char *tag) | |
617 | { | |
b5c45da1 | 618 | const gchash *const *hh; |
410c8acf | 619 | |
620 | kr_priv = priv; | |
621 | kr_pub = pub; | |
622 | tag_priv = tag; | |
623 | fwatch_init(&w_priv, kr_priv); | |
624 | fwatch_init(&w_pub, kr_pub); | |
625 | ||
b5c45da1 | 626 | for (hh = ghashtab; *hh; hh++) { |
627 | if ((*hh)->hashsz > MAXHASHSZ) { | |
628 | die(EXIT_FAILURE, "INTERNAL ERROR: %s hash length %lu > MAXHASHSZ %d", | |
629 | (*hh)->name, (unsigned long)(*hh)->hashsz, MAXHASHSZ); | |
630 | } | |
631 | } | |
632 | ||
4d36660a MW |
633 | if (loadpriv() || loadpub()) |
634 | exit(EXIT_FAILURE); | |
410c8acf | 635 | } |
636 | ||
637 | /* --- @km_getpubkey@ --- * | |
638 | * | |
639 | * Arguments: @const char *tag@ = public key tag to load | |
52c03a2a | 640 | * @ge *kpub@ = where to put the public key |
00e64b67 | 641 | * @time_t *t_exp@ = where to put the expiry time |
410c8acf | 642 | * |
643 | * Returns: Zero if OK, nonzero if it failed. | |
644 | * | |
645 | * Use: Fetches a public key from the keyring. | |
646 | */ | |
647 | ||
52c03a2a | 648 | int km_getpubkey(const char *tag, ge *kpub, time_t *t_exp) |
410c8acf | 649 | { |
00e64b67 | 650 | key *k; |
d59d4fe9 | 651 | key_data **kd; |
52c03a2a | 652 | dstr t = DSTR_INIT; |
4d36660a | 653 | dstr e = DSTR_INIT; |
fc5f4823 | 654 | const kgops *ko; |
4d36660a | 655 | const char *ty; |
52c03a2a | 656 | group *g = 0; |
657 | ge *p = 0; | |
b5c45da1 | 658 | algswitch a; |
52c03a2a | 659 | int rc = -1; |
660 | ||
661 | /* --- Find the key --- */ | |
662 | ||
663 | if (key_qtag(kf_pub, tag, &t, &k, &kd)) { | |
4d36660a MW |
664 | a_warn("KEYMGMT", "public-keyring", "%s", kr_pub, |
665 | "key-not-found", "%s", tag, A_END); | |
52c03a2a | 666 | goto done; |
667 | } | |
410c8acf | 668 | |
52c03a2a | 669 | /* --- Look up the key type in the table --- */ |
670 | ||
fc5f4823 | 671 | if ((ko = keykg(kf_pub, k, &ty)) == 0) { |
4d36660a MW |
672 | a_warn("KEYMGMT", "public-keyring", |
673 | "%s", kr_pub, "key", "%s", t.buf, | |
674 | "unknown-group-type", "%s", ty, A_END); | |
fc5f4823 | 675 | goto done; |
52c03a2a | 676 | } |
52c03a2a | 677 | |
678 | /* --- Load the key --- */ | |
679 | ||
4d36660a MW |
680 | if (ko->loadpub(*kd, &g, &p, &t, &e)) { |
681 | a_warn("KEYMGMT", "public-keyring", | |
682 | "%s", kr_pub, "key", "%s", t.buf, | |
683 | "*%s", e.buf, A_END); | |
52c03a2a | 684 | goto done; |
685 | } | |
686 | ||
687 | /* --- Ensure that the group is correct --- * | |
688 | * | |
e04c2d50 | 689 | * Dodginess! We assume that if this works, our global group is willing to |
52c03a2a | 690 | * adopt this public element. Probably reasonable. |
691 | */ | |
692 | ||
693 | if (!group_samep(gg, g)) { | |
4d36660a MW |
694 | a_warn("KEYMGMT", "public-keyring", |
695 | "%s", kr_pub, "key", "%s", t.buf, | |
696 | "*%s", e.buf, A_END); | |
52c03a2a | 697 | goto done; |
698 | } | |
699 | ||
700 | /* --- Check the public group element --- */ | |
701 | ||
702 | if (group_check(gg, p)) { | |
4d36660a MW |
703 | a_warn("KEYMGMT", "public-keyring", |
704 | "%s", kr_pub, "key", "%s", t.buf, | |
f43df819 MW |
705 | "bad-public-group-element", |
706 | A_END); | |
52c03a2a | 707 | goto done; |
410c8acf | 708 | } |
52c03a2a | 709 | |
b5c45da1 | 710 | /* --- Check the algorithms --- */ |
711 | ||
4d36660a MW |
712 | if (algs_get(&a, &e, kf_pub, k)) { |
713 | a_warn("KEYMGMT", "public-keyring", | |
714 | "%s", kr_pub, "key", "%s", t.buf, | |
715 | "*%s", e.buf, A_END); | |
b5c45da1 | 716 | goto done; |
717 | } | |
3cdc3f3a | 718 | if (!algs_samep(&a, &algs)) { |
4d36660a MW |
719 | a_warn("KEYMGMT", "public-keyring", |
720 | "%s", kr_pub, "key", "%s", t.buf, | |
721 | "algorithm-mismatch", A_END); | |
b5c45da1 | 722 | goto done; |
723 | } | |
724 | ||
52c03a2a | 725 | /* --- Dump the public key --- */ |
726 | ||
410c8acf | 727 | IF_TRACING(T_KEYMGMT, { |
52c03a2a | 728 | trace(T_KEYMGMT, "keymgmt: extracted public key `%s'", t.buf); |
729 | trace(T_CRYPTO, "crypto: p = %s", gestr(gg, p)); | |
410c8acf | 730 | }) |
52c03a2a | 731 | |
732 | /* --- OK, accept the public key --- */ | |
733 | ||
00e64b67 | 734 | *t_exp = k->exp; |
52c03a2a | 735 | G_COPY(gg, kpub, p); |
736 | rc = 0; | |
737 | ||
738 | /* --- Tidy up --- */ | |
739 | ||
740 | done: | |
741 | if (p) G_DESTROY(g, p); | |
742 | if (g) G_DESTROYGROUP(g); | |
743 | dstr_destroy(&t); | |
4d36660a | 744 | dstr_destroy(&e); |
52c03a2a | 745 | return (rc); |
410c8acf | 746 | } |
747 | ||
748 | /*----- That's all, folks -------------------------------------------------*/ |