3 * $Id: keymgmt.c,v 1.3 2001/06/22 19:40:36 mdw Exp $
5 * Key loading and storing
7 * (c) 2001 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Trivial IP Encryption (TrIPE).
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.
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.
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.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.3 2001/06/22 19:40:36 mdw
33 * Support expiry of other peers' public keys.
35 * Revision 1.2 2001/06/19 22:07:09 mdw
38 * Revision 1.1 2001/02/03 20:26:37 mdw
43 /*----- Header files ------------------------------------------------------*/
47 /*----- Global variables --------------------------------------------------*/
52 /*----- Static variables --------------------------------------------------*/
54 static key_file *kf_pub;
55 static const char *kr_priv, *kr_pub, *tag_priv;
56 static fwatch w_priv, w_pub;
58 /*----- Main code ---------------------------------------------------------*/
60 /* --- @keymoan@ --- *
62 * Arguments: @const char *file@ = name of the file
63 * @int line@ = line number in file
64 * @const char *msg@ = error message
65 * @void *p@ = argument pointer
69 * Use: Reports an error message about loading a key file.
72 static void keymoan(const char *file, int line, const char *msg, void *p)
74 a_warn("%s:%i: error: %s", file, line, msg);
77 /* --- @loadpriv@ --- *
79 * Arguments: @dstr *d@ = string to write errors in
80 * @dh_priv *dh@ = where to store the key
82 * Returns: Zero if OK, nonzero on error.
84 * Use: Loads the private key from its keyfile.
87 static int loadpriv(dstr *d, dh_priv *dh)
90 key_packstruct kps[DH_PRIVFETCHSZ];
96 if (key_open(&kf, kr_priv, KOPEN_READ, keymoan, 0)) {
97 dstr_putf(d, "error reading private keyring `%s': %s",
98 kr_priv, strerror(errno));
101 T( trace(T_KEYMGMT, "keymgmt: loaded private keyring `%s'", kr_priv); )
102 kp = key_fetchinit(dh_privfetch, kps, &mydh);
103 if ((e = key_fetchbyname(kp, &kf, tag_priv)) != 0) {
104 dstr_putf(d, "error loading private key `%s': %s",
105 tag_priv, key_strerror(e));
108 dh->dp.p = MP_COPY(mydh.dp.p);
109 dh->dp.q = MP_COPY(mydh.dp.q);
110 dh->dp.g = MP_COPY(mydh.dp.g);
111 dh->x = MP_COPY(mydh.x);
112 dh->y = MP_COPY(mydh.y);
113 IF_TRACING(T_KEYMGMT, {
114 trace(T_KEYMGMT, "keymgmt: extracted private key `%s'", tag_priv);
115 IF_TRACING(T_CRYPTO, {
116 trace(T_CRYPTO, "crypto: p = %s", mpstr(kpriv.dp.p));
117 trace(T_CRYPTO, "crypto: q = %s", mpstr(kpriv.dp.q));
118 trace(T_CRYPTO, "crypto: g = %s", mpstr(kpriv.dp.g));
119 trace(T_CRYPTO, "crypto: x = %s", mpstr(kpriv.x));
120 trace(T_CRYPTO, "crypto: g^x = %s", mpstr(kpriv.y));
130 /* --- @loadpub@ --- *
132 * Arguments: @dstr *d@ = string to write errors to
134 * Returns: Zero if OK, nonzero on error.
136 * Use: Reloads the public keyring.
139 static int loadpub(dstr *d)
141 key_file *kf = CREATE(key_file);
143 if (key_open(kf, kr_pub, KOPEN_READ, keymoan, 0)) {
144 dstr_putf(d, "error reading public keyring `%s': %s",
145 kr_pub, strerror(errno));
150 T( trace(T_KEYMGMT, "keymgmt: loaded public keyring `%s'", kr_pub); )
154 /* --- @km_interval@ --- *
158 * Returns: Zero if OK, nonzero to force reloading of keys.
160 * Use: Called on the interval timer to perform various useful jobs.
163 int km_interval(void)
170 /* --- Check the private key first --- */
172 if (fwatch_update(&w_priv, kr_priv)) {
173 T( trace(T_KEYMGMT, "keymgmt: private keyring updated: reloading..."); )
175 if (loadpriv(&d, &dh))
176 a_warn("%s -- ignoring changes", d.buf);
182 mpmont_create(&mg, kpriv.dp.p);
186 /* --- Now check the public keys --- */
188 if (fwatch_update(&w_pub, kr_pub)) {
189 T( trace(T_KEYMGMT, "keymgmt: public keyring updated: reloading..."); )
193 a_warn("%s -- ignoring changes", d.buf);
206 /* --- @km_init@ --- *
208 * Arguments: @const char *priv@ = private keyring file
209 * @const char *pub@ = public keyring file
210 * @const char *tag@ = tag to load
214 * Use: Initializes, and loads the private key.
217 void km_init(const char *priv, const char *pub, const char *tag)
224 fwatch_init(&w_priv, kr_priv);
225 fwatch_init(&w_pub, kr_pub);
228 if (loadpriv(&d, &kpriv))
229 die(EXIT_FAILURE, "%s", d.buf);
230 mpmont_create(&mg, kpriv.dp.p);
232 die(EXIT_FAILURE, "%s", d.buf);
235 /* --- @km_getpubkey@ --- *
237 * Arguments: @const char *tag@ = public key tag to load
238 * @dh_pub *kpub@ = where to put the public key
239 * @time_t *t_exp@ = where to put the expiry time
241 * Returns: Zero if OK, nonzero if it failed.
243 * Use: Fetches a public key from the keyring.
246 int km_getpubkey(const char *tag, dh_pub *kpub, time_t *t_exp)
248 key_packstruct kps[DH_PUBFETCHSZ];
254 kp = key_fetchinit(dh_pubfetch, kps, &dp);
255 if ((k = key_bytag(kf_pub, tag)) == 0)
258 e = key_fetch(kp, k);
261 a_warn("error loading public key `%s': %s", tag, key_strerror(e));
264 IF_TRACING(T_KEYMGMT, {
265 trace(T_KEYMGMT, "keymgmt: extracted public key `%s'", tag);
266 IF_TRACING(T_CRYPTO, {
267 trace(T_CRYPTO, "crypto: p = %s", mpstr(dp.dp.p));
268 trace(T_CRYPTO, "crypto: q = %s", mpstr(dp.dp.q));
269 trace(T_CRYPTO, "crypto: g = %s", mpstr(dp.dp.g));
270 trace(T_CRYPTO, "crypto: g^x = %s", mpstr(dp.y));
273 if (!mp_eq(dp.dp.p, kpriv.dp.p) ||
274 !mp_eq(dp.dp.q, kpriv.dp.q) ||
275 !mp_eq(dp.dp.g, kpriv.dp.g)) {
276 a_warn("public key `%s' has different group from private key", tag);
279 kpub->dp.p = MP_COPY(dp.dp.p);
280 kpub->dp.q = MP_COPY(dp.dp.q);
281 kpub->dp.g = MP_COPY(dp.dp.g);
282 kpub->y = MP_COPY(dp.y);
287 /*----- That's all, folks -------------------------------------------------*/