[tripe] / keymgmt.c

/* -*-c-*-
 *
 * $Id: keymgmt.c,v 1.3 2001/06/22 19:40:36 mdw Exp $
 *
 * Key loading and storing
 *
 * (c) 2001 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of Trivial IP Encryption (TrIPE).
 *
 * TrIPE is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * TrIPE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with TrIPE; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: keymgmt.c,v $
 * Revision 1.3  2001/06/22 19:40:36  mdw
 * Support expiry of other peers' public keys.
 *
 * Revision 1.2  2001/06/19 22:07:09  mdw
 * Cosmetic fixes.
 *
 * Revision 1.1  2001/02/03 20:26:37  mdw
 * Initial checkin.
 *
 */

/*----- Header files ------------------------------------------------------*/

#include "tripe.h"

/*----- Global variables --------------------------------------------------*/

mpmont mg;
dh_priv kpriv;

/*----- Static variables --------------------------------------------------*/

static key_file *kf_pub;
static const char *kr_priv, *kr_pub, *tag_priv;
static fwatch w_priv, w_pub;

/*----- Main code ---------------------------------------------------------*/

/* --- @keymoan@ --- *
 *
 * Arguments:	@const char *file@ = name of the file
 *              @int line@ = line number in file
 *              @const char *msg@ = error message
 *              @void *p@ = argument pointer
 *
 * Returns:     ---
 *
 * Use:         Reports an error message about loading a key file.
 */

static void keymoan(const char *file, int line, const char *msg, void *p)
{
  a_warn("%s:%i: error: %s", file, line, msg);
}

/* --- @loadpriv@ --- *
 *
 * Arguments:	@dstr *d@ = string to write errors in
 *		@dh_priv *dh@ = where to store the key
 *
 * Returns:	Zero if OK, nonzero on error.
 *
 * Use:		Loads the private key from its keyfile.
 */

static int loadpriv(dstr *d, dh_priv *dh)
{
  key_file kf;
  key_packstruct kps[DH_PRIVFETCHSZ];
  key_packdef *kp;
  dh_priv mydh;
  int rc = 0;
  int e;

  if (key_open(&kf, kr_priv, KOPEN_READ, keymoan, 0)) {
    dstr_putf(d, "error reading private keyring `%s': %s",
	      kr_priv, strerror(errno));
    rc = -1;
  } else {
    T( trace(T_KEYMGMT, "keymgmt: loaded private keyring `%s'", kr_priv); )
    kp = key_fetchinit(dh_privfetch, kps, &mydh);
    if ((e = key_fetchbyname(kp, &kf, tag_priv)) != 0) {
      dstr_putf(d, "error loading private key `%s': %s",
		tag_priv, key_strerror(e));
      rc = -1;
    } else {
      dh->dp.p = MP_COPY(mydh.dp.p);
      dh->dp.q = MP_COPY(mydh.dp.q);
      dh->dp.g = MP_COPY(mydh.dp.g);
      dh->x = MP_COPY(mydh.x);
      dh->y = MP_COPY(mydh.y);      
      IF_TRACING(T_KEYMGMT, {
	trace(T_KEYMGMT, "keymgmt: extracted private key `%s'", tag_priv);
	IF_TRACING(T_CRYPTO, {
	  trace(T_CRYPTO, "crypto: p = %s", mpstr(kpriv.dp.p));
	  trace(T_CRYPTO, "crypto: q = %s", mpstr(kpriv.dp.q));
	  trace(T_CRYPTO, "crypto: g = %s", mpstr(kpriv.dp.g));
	  trace(T_CRYPTO, "crypto: x = %s", mpstr(kpriv.x));
	  trace(T_CRYPTO, "crypto: g^x = %s", mpstr(kpriv.y));
	})
      })
    }
    key_fetchdone(kp);
    key_close(&kf);
  }
  return (rc);
}

/* --- @loadpub@ --- *
 *
 * Arguments:	@dstr *d@ = string to write errors to
 *
 * Returns:	Zero if OK, nonzero on error.
 *
 * Use:		Reloads the public keyring.
 */

static int loadpub(dstr *d)
{
  key_file *kf = CREATE(key_file);

  if (key_open(kf, kr_pub, KOPEN_READ, keymoan, 0)) {
    dstr_putf(d, "error reading public keyring `%s': %s",
	      kr_pub, strerror(errno));
    DESTROY(kf);
    return (-1);
  }
  kf_pub = kf;
  T( trace(T_KEYMGMT, "keymgmt: loaded public keyring `%s'", kr_pub); )
  return (0);
}

/* --- @km_interval@ --- *
 *
 * Arguments:	---
 *
 * Returns:	Zero if OK, nonzero to force reloading of keys.
 *
 * Use:		Called on the interval timer to perform various useful jobs.
 */

int km_interval(void)
{
  dstr d = DSTR_INIT;
  dh_priv dh;
  key_file *kf;
  int reload = 0;

  /* --- Check the private key first --- */

  if (fwatch_update(&w_priv, kr_priv)) {
    T( trace(T_KEYMGMT, "keymgmt: private keyring updated: reloading..."); )
    DRESET(&d);
    if (loadpriv(&d, &dh))
      a_warn("%s -- ignoring changes", d.buf);
    else {
      reload = 1;
      mpmont_destroy(&mg);
      dh_privfree(&kpriv);
      kpriv = dh;
      mpmont_create(&mg, kpriv.dp.p);
    }
  }

  /* --- Now check the public keys --- */

  if (fwatch_update(&w_pub, kr_pub)) {
    T( trace(T_KEYMGMT, "keymgmt: public keyring updated: reloading..."); )
    kf = kf_pub;
    DRESET(&d);
    if (loadpub(&d))
      a_warn("%s -- ignoring changes", d.buf);
    else {
      reload = 1;
      key_close(kf);
      DESTROY(kf);
    }
  }

  /* --- Done --- */

  return (reload);
}

/* --- @km_init@ --- *
 *
 * Arguments:	@const char *priv@ = private keyring file
 *		@const char *pub@ = public keyring file
 *		@const char *tag@ = tag to load
 *
 * Returns:	---
 *
 * Use:		Initializes, and loads the private key.
 */

void km_init(const char *priv, const char *pub, const char *tag)
{
  dstr d = DSTR_INIT;

  kr_priv = priv;
  kr_pub = pub;
  tag_priv = tag;
  fwatch_init(&w_priv, kr_priv);
  fwatch_init(&w_pub, kr_pub);

  DRESET(&d);
  if (loadpriv(&d, &kpriv))
    die(EXIT_FAILURE, "%s", d.buf);
  mpmont_create(&mg, kpriv.dp.p);
  if (loadpub(&d))
    die(EXIT_FAILURE, "%s", d.buf);
}

/* --- @km_getpubkey@ --- *
 *
 * Arguments:	@const char *tag@ = public key tag to load
 *		@dh_pub *kpub@ = where to put the public key
 *		@time_t *t_exp@ = where to put the expiry time
 *
 * Returns:	Zero if OK, nonzero if it failed.
 *
 * Use:		Fetches a public key from the keyring.
 */

int km_getpubkey(const char *tag, dh_pub *kpub, time_t *t_exp)
{
  key_packstruct kps[DH_PUBFETCHSZ];
  key_packdef *kp;
  key *k;
  dh_pub dp;
  int e;

  kp = key_fetchinit(dh_pubfetch, kps, &dp);
  if ((k = key_bytag(kf_pub, tag)) == 0)
    e = KERR_NOTFOUND;
  else
    e = key_fetch(kp, k);
  key_fetchdone(kp);
  if (e) {
    a_warn("error loading public key `%s': %s", tag, key_strerror(e));
    return (-1);
  }
  IF_TRACING(T_KEYMGMT, {
    trace(T_KEYMGMT, "keymgmt: extracted public key `%s'", tag);
    IF_TRACING(T_CRYPTO, {
      trace(T_CRYPTO, "crypto: p = %s", mpstr(dp.dp.p));
      trace(T_CRYPTO, "crypto: q = %s", mpstr(dp.dp.q));
      trace(T_CRYPTO, "crypto: g = %s", mpstr(dp.dp.g));
      trace(T_CRYPTO, "crypto: g^x = %s", mpstr(dp.y));
    })
  })
  if (!mp_eq(dp.dp.p, kpriv.dp.p) ||
      !mp_eq(dp.dp.q, kpriv.dp.q) ||
      !mp_eq(dp.dp.g, kpriv.dp.g)) {
    a_warn("public key `%s' has different group from private key", tag);
    return (-1);
  }
  kpub->dp.p = MP_COPY(dp.dp.p);
  kpub->dp.q = MP_COPY(dp.dp.q);
  kpub->dp.g = MP_COPY(dp.dp.g);
  kpub->y = MP_COPY(dp.y);
  *t_exp = k->exp;
  return (0);
}

/*----- That's all, folks -------------------------------------------------*/
Commit	Line	Data
410c8acf	1	/* --c--
410c8acf	2	*
00e64b67	3	* $Id: keymgmt.c,v 1.3 2001/06/22 19:40:36 mdw Exp $
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
	29	/----- Revision history --------------------------------------------------
	30	*
	31	* $Log: keymgmt.c,v $
00e64b67	32	* Revision 1.3 2001/06/22 19:40:36 mdw
	33	* Support expiry of other peers' public keys.
	34	*
56814747	35	* Revision 1.2 2001/06/19 22:07:09 mdw
	36	* Cosmetic fixes.
	37	*
410c8acf	38	* Revision 1.1 2001/02/03 20:26:37 mdw
	39	* Initial checkin.
	40	*
	41	*/
	42
	43	/----- Header files ------------------------------------------------------/
	44
	45	#include "tripe.h"
	46
	47	/----- Global variables --------------------------------------------------/
	48
	49	mpmont mg;
	50	dh_priv kpriv;
	51
	52	/----- Static variables --------------------------------------------------/
	53
	54	static key_file *kf_pub;
	55	static const char kr_priv, kr_pub, *tag_priv;
	56	static fwatch w_priv, w_pub;
	57
	58	/----- Main code ---------------------------------------------------------/
	59
	60	/* --- @keymoan@ --- *
	61	*
56814747	62	* Arguments: @const char *file@ = name of the file
410c8acf	63	* @int line@ = line number in file
	64	* @const char *msg@ = error message
	65	* @void *p@ = argument pointer
	66	*
	67	* Returns: ---
	68	*
	69	* Use: Reports an error message about loading a key file.
	70	*/
	71
	72	static void keymoan(const char file, int line, const char msg, void *p)
	73	{
	74	a_warn("%s:%i: error: %s", file, line, msg);
	75	}
	76
	77	/* --- @loadpriv@ --- *
	78	*
	79	* Arguments: @dstr *d@ = string to write errors in
	80	* @dh_priv *dh@ = where to store the key
	81	*
	82	* Returns: Zero if OK, nonzero on error.
	83	*
	84	* Use: Loads the private key from its keyfile.
	85	*/
	86
	87	static int loadpriv(dstr d, dh_priv dh)
	88	{
	89	key_file kf;
	90	key_packstruct kps[DH_PRIVFETCHSZ];
	91	key_packdef *kp;
	92	dh_priv mydh;
	93	int rc = 0;
	94	int e;
	95
	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));
	99	rc = -1;
	100	} else {
	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));
	106	rc = -1;
	107	} else {
	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));
	121	})
	122	})
	123	}
	124	key_fetchdone(kp);
	125	key_close(&kf);
	126	}
127	return (rc);
128	}
129
130	/* --- @loadpub@ --- *
131	*
132	* Arguments: @dstr *d@ = string to write errors to
133	*
134	* Returns: Zero if OK, nonzero on error.
135	*
136	* Use: Reloads the public keyring.
137	*/
138
139	static int loadpub(dstr *d)
140	{
141	key_file *kf = CREATE(key_file);
142
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));
146	DESTROY(kf);
147	return (-1);
148	}
149	kf_pub = kf;
150	T( trace(T_KEYMGMT, "keymgmt: loaded public keyring `%s'", kr_pub); )
151	return (0);
152	}
153
154	/* --- @km_interval@ --- *
155	*
156	* Arguments: ---
157	*
158	* Returns: Zero if OK, nonzero to force reloading of keys.
159	*
160	* Use: Called on the interval timer to perform various useful jobs.
161	*/
162
163	int km_interval(void)
164	{
165	dstr d = DSTR_INIT;
166	dh_priv dh;
167	key_file *kf;
168	int reload = 0;
169
170	/* --- Check the private key first --- */
171
172	if (fwatch_update(&w_priv, kr_priv)) {
173	T( trace(T_KEYMGMT, "keymgmt: private keyring updated: reloading..."); )
174	DRESET(&d);
175	if (loadpriv(&d, &dh))
176	a_warn("%s -- ignoring changes", d.buf);
177	else {
178	reload = 1;
179	mpmont_destroy(&mg);
180	dh_privfree(&kpriv);
181	kpriv = dh;
182	mpmont_create(&mg, kpriv.dp.p);
183	}
184	}
185
186	/* --- Now check the public keys --- */
187
188	if (fwatch_update(&w_pub, kr_pub)) {
189	T( trace(T_KEYMGMT, "keymgmt: public keyring updated: reloading..."); )
190	kf = kf_pub;
191	DRESET(&d);
192	if (loadpub(&d))
193	a_warn("%s -- ignoring changes", d.buf);
194	else {
195	reload = 1;
196	key_close(kf);
197	DESTROY(kf);
198	}
199	}
200
201	/* --- Done --- */
202
203	return (reload);
204	}
205
206	/* --- @km_init@ --- *
207	*
208	* Arguments: @const char *priv@ = private keyring file
209	* @const char *pub@ = public keyring file
210	* @const char *tag@ = tag to load
211	*
212	* Returns: ---
213	*
214	* Use: Initializes, and loads the private key.
215	*/
216
217	void km_init(const char priv, const char pub, const char *tag)
218	{
219	dstr d = DSTR_INIT;
220
221	kr_priv = priv;
222	kr_pub = pub;
223	tag_priv = tag;
224	fwatch_init(&w_priv, kr_priv);
225	fwatch_init(&w_pub, kr_pub);
226
227	DRESET(&d);
228	if (loadpriv(&d, &kpriv))
229	die(EXIT_FAILURE, "%s", d.buf);
230	mpmont_create(&mg, kpriv.dp.p);
231	if (loadpub(&d))
232	die(EXIT_FAILURE, "%s", d.buf);
233	}
234
235	/* --- @km_getpubkey@ --- *
236	*
237	* Arguments: @const char *tag@ = public key tag to load
238	* @dh_pub *kpub@ = where to put the public key
00e64b67	239	* @time_t *t_exp@ = where to put the expiry time
410c8acf	240	*
	241	* Returns: Zero if OK, nonzero if it failed.
	242	*
	243	* Use: Fetches a public key from the keyring.
	244	*/
	245
00e64b67	246	int km_getpubkey(const char tag, dh_pub kpub, time_t *t_exp)
410c8acf	247	{
	248	key_packstruct kps[DH_PUBFETCHSZ];
	249	key_packdef *kp;
00e64b67	250	key *k;
410c8acf	251	dh_pub dp;
	252	int e;
	253
	254	kp = key_fetchinit(dh_pubfetch, kps, &dp);
00e64b67	255	if ((k = key_bytag(kf_pub, tag)) == 0)
	256	e = KERR_NOTFOUND;
	257	else
	258	e = key_fetch(kp, k);
410c8acf	259	key_fetchdone(kp);
	260	if (e) {
	261	a_warn("error loading public key `%s': %s", tag, key_strerror(e));
	262	return (-1);
	263	}
	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));
	271	})
	272	})
	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);
	277	return (-1);
	278	}
	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);
00e64b67	283	*t_exp = k->exp;
410c8acf	284	return (0);
	285	}
	286
	287	/----- That's all, folks -------------------------------------------------/