chiark / gitweb /
Don't link the client against Catacomb.
[tripe] / keymgmt.c
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410c8acf 1/* -*-c-*-
2 *
3 * $Id: keymgmt.c,v 1.1 2001/02/03 20:26:37 mdw Exp $
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
29/*----- Revision history --------------------------------------------------*
30 *
31 * $Log: keymgmt.c,v $
32 * Revision 1.1 2001/02/03 20:26:37 mdw
33 * Initial checkin.
34 *
35 */
36
37/*----- Header files ------------------------------------------------------*/
38
39#include "tripe.h"
40
41/*----- Global variables --------------------------------------------------*/
42
43mpmont mg;
44dh_priv kpriv;
45
46/*----- Static variables --------------------------------------------------*/
47
48static key_file *kf_pub;
49static const char *kr_priv, *kr_pub, *tag_priv;
50static fwatch w_priv, w_pub;
51
52/*----- Main code ---------------------------------------------------------*/
53
54/* --- @keymoan@ --- *
55 *
56 * Arguments: @@const char *file@ = name of the file
57 * @int line@ = line number in file
58 * @const char *msg@ = error message
59 * @void *p@ = argument pointer
60 *
61 * Returns: ---
62 *
63 * Use: Reports an error message about loading a key file.
64 */
65
66static void keymoan(const char *file, int line, const char *msg, void *p)
67{
68 a_warn("%s:%i: error: %s", file, line, msg);
69}
70
71/* --- @loadpriv@ --- *
72 *
73 * Arguments: @dstr *d@ = string to write errors in
74 * @dh_priv *dh@ = where to store the key
75 *
76 * Returns: Zero if OK, nonzero on error.
77 *
78 * Use: Loads the private key from its keyfile.
79 */
80
81static int loadpriv(dstr *d, dh_priv *dh)
82{
83 key_file kf;
84 key_packstruct kps[DH_PRIVFETCHSZ];
85 key_packdef *kp;
86 dh_priv mydh;
87 int rc = 0;
88 int e;
89
90 if (key_open(&kf, kr_priv, KOPEN_READ, keymoan, 0)) {
91 dstr_putf(d, "error reading private keyring `%s': %s",
92 kr_priv, strerror(errno));
93 rc = -1;
94 } else {
95 T( trace(T_KEYMGMT, "keymgmt: loaded private keyring `%s'", kr_priv); )
96 kp = key_fetchinit(dh_privfetch, kps, &mydh);
97 if ((e = key_fetchbyname(kp, &kf, tag_priv)) != 0) {
98 dstr_putf(d, "error loading private key `%s': %s",
99 tag_priv, key_strerror(e));
100 rc = -1;
101 } else {
102 dh->dp.p = MP_COPY(mydh.dp.p);
103 dh->dp.q = MP_COPY(mydh.dp.q);
104 dh->dp.g = MP_COPY(mydh.dp.g);
105 dh->x = MP_COPY(mydh.x);
106 dh->y = MP_COPY(mydh.y);
107 IF_TRACING(T_KEYMGMT, {
108 trace(T_KEYMGMT, "keymgmt: extracted private key `%s'", tag_priv);
109 IF_TRACING(T_CRYPTO, {
110 trace(T_CRYPTO, "crypto: p = %s", mpstr(kpriv.dp.p));
111 trace(T_CRYPTO, "crypto: q = %s", mpstr(kpriv.dp.q));
112 trace(T_CRYPTO, "crypto: g = %s", mpstr(kpriv.dp.g));
113 trace(T_CRYPTO, "crypto: x = %s", mpstr(kpriv.x));
114 trace(T_CRYPTO, "crypto: g^x = %s", mpstr(kpriv.y));
115 })
116 })
117 }
118 key_fetchdone(kp);
119 key_close(&kf);
120 }
121 return (rc);
122}
123
124/* --- @loadpub@ --- *
125 *
126 * Arguments: @dstr *d@ = string to write errors to
127 *
128 * Returns: Zero if OK, nonzero on error.
129 *
130 * Use: Reloads the public keyring.
131 */
132
133static int loadpub(dstr *d)
134{
135 key_file *kf = CREATE(key_file);
136
137 if (key_open(kf, kr_pub, KOPEN_READ, keymoan, 0)) {
138 dstr_putf(d, "error reading public keyring `%s': %s",
139 kr_pub, strerror(errno));
140 DESTROY(kf);
141 return (-1);
142 }
143 kf_pub = kf;
144 T( trace(T_KEYMGMT, "keymgmt: loaded public keyring `%s'", kr_pub); )
145 return (0);
146}
147
148/* --- @km_interval@ --- *
149 *
150 * Arguments: ---
151 *
152 * Returns: Zero if OK, nonzero to force reloading of keys.
153 *
154 * Use: Called on the interval timer to perform various useful jobs.
155 */
156
157int km_interval(void)
158{
159 dstr d = DSTR_INIT;
160 dh_priv dh;
161 key_file *kf;
162 int reload = 0;
163
164 /* --- Check the private key first --- */
165
166 if (fwatch_update(&w_priv, kr_priv)) {
167 T( trace(T_KEYMGMT, "keymgmt: private keyring updated: reloading..."); )
168 DRESET(&d);
169 if (loadpriv(&d, &dh))
170 a_warn("%s -- ignoring changes", d.buf);
171 else {
172 reload = 1;
173 mpmont_destroy(&mg);
174 dh_privfree(&kpriv);
175 kpriv = dh;
176 mpmont_create(&mg, kpriv.dp.p);
177 }
178 }
179
180 /* --- Now check the public keys --- */
181
182 if (fwatch_update(&w_pub, kr_pub)) {
183 T( trace(T_KEYMGMT, "keymgmt: public keyring updated: reloading..."); )
184 kf = kf_pub;
185 DRESET(&d);
186 if (loadpub(&d))
187 a_warn("%s -- ignoring changes", d.buf);
188 else {
189 reload = 1;
190 key_close(kf);
191 DESTROY(kf);
192 }
193 }
194
195 /* --- Done --- */
196
197 return (reload);
198}
199
200/* --- @km_init@ --- *
201 *
202 * Arguments: @const char *priv@ = private keyring file
203 * @const char *pub@ = public keyring file
204 * @const char *tag@ = tag to load
205 *
206 * Returns: ---
207 *
208 * Use: Initializes, and loads the private key.
209 */
210
211void km_init(const char *priv, const char *pub, const char *tag)
212{
213 dstr d = DSTR_INIT;
214
215 kr_priv = priv;
216 kr_pub = pub;
217 tag_priv = tag;
218 fwatch_init(&w_priv, kr_priv);
219 fwatch_init(&w_pub, kr_pub);
220
221 DRESET(&d);
222 if (loadpriv(&d, &kpriv))
223 die(EXIT_FAILURE, "%s", d.buf);
224 mpmont_create(&mg, kpriv.dp.p);
225 if (loadpub(&d))
226 die(EXIT_FAILURE, "%s", d.buf);
227}
228
229/* --- @km_getpubkey@ --- *
230 *
231 * Arguments: @const char *tag@ = public key tag to load
232 * @dh_pub *kpub@ = where to put the public key
233 *
234 * Returns: Zero if OK, nonzero if it failed.
235 *
236 * Use: Fetches a public key from the keyring.
237 */
238
239int km_getpubkey(const char *tag, dh_pub *kpub)
240{
241 key_packstruct kps[DH_PUBFETCHSZ];
242 key_packdef *kp;
243 dh_pub dp;
244 int e;
245
246 kp = key_fetchinit(dh_pubfetch, kps, &dp);
247 e = key_fetchbyname(kp, kf_pub, tag);
248 key_fetchdone(kp);
249 if (e) {
250 a_warn("error loading public key `%s': %s", tag, key_strerror(e));
251 return (-1);
252 }
253 IF_TRACING(T_KEYMGMT, {
254 trace(T_KEYMGMT, "keymgmt: extracted public key `%s'", tag);
255 IF_TRACING(T_CRYPTO, {
256 trace(T_CRYPTO, "crypto: p = %s", mpstr(dp.dp.p));
257 trace(T_CRYPTO, "crypto: q = %s", mpstr(dp.dp.q));
258 trace(T_CRYPTO, "crypto: g = %s", mpstr(dp.dp.g));
259 trace(T_CRYPTO, "crypto: g^x = %s", mpstr(dp.y));
260 })
261 })
262 if (!mp_eq(dp.dp.p, kpriv.dp.p) ||
263 !mp_eq(dp.dp.q, kpriv.dp.q) ||
264 !mp_eq(dp.dp.g, kpriv.dp.g)) {
265 a_warn("public key `%s' has different group from private key", tag);
266 return (-1);
267 }
268 kpub->dp.p = MP_COPY(dp.dp.p);
269 kpub->dp.q = MP_COPY(dp.dp.q);
270 kpub->dp.g = MP_COPY(dp.dp.g);
271 kpub->y = MP_COPY(dp.y);
272 return (0);
273}
274
275/*----- That's all, folks -------------------------------------------------*/