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29 * @(#)setkey.c 1.11 94/04/25 SMI
30 * $FreeBSD: src/usr.sbin/keyserv/setkey.c,v 1.3 1999/08/28 01:16:41 peter Exp $
31 * $DragonFly: src/usr.sbin/keyserv/setkey.c,v 1.8 2005/01/11 13:22:40 joerg Exp $
35 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
39 * Do the real work of the keyserver.
40 * Store secret keys. Compute common keys,
41 * and use them to decrypt and encrypt DES keys.
42 * Cache the common keys, so the expensive computation is avoided.
49 #include <sys/types.h>
51 #include <rpc/key_prot.h>
52 #include <rpc/des_crypt.h>
54 #include <sys/errno.h>
56 #include <openssl/bn.h>
57 #include <openssl/crypto.h>
58 #include <openssl/err.h>
60 static BIGNUM *modulus;
61 static char *fetchsecretkey( uid_t );
62 static void writecache( char *, char *, des_block * );
63 static int readcache( char *, char *, des_block * );
64 static void extractdeskey ( BIGNUM *, des_block * );
65 static int storesecretkey( uid_t, keybuf );
66 static keystatus pk_crypt( uid_t, char *, netobj *, des_block *, int);
67 static int nodefaultkeys = 0;
71 * prohibit the nobody key on this machine k (the -d flag)
74 pk_nodefaultkeys(void)
80 * Set the modulus for all our Diffie-Hellman operations
83 setmodulus(char *modx)
85 if (BN_hex2bn(&modulus, modx) == NULL)
86 errx(1, "could not convert modulus to BIGNUM: %s",
87 ERR_error_string(ERR_get_error(), 0));
91 * Set the secretkey key for this uid
94 pk_setkey(uid_t uid, keybuf skey)
96 if (!storesecretkey(uid, skey)) {
97 return (KEY_SYSTEMERR);
103 * Encrypt the key using the public key associated with remote_name and the
104 * secret key associated with uid.
107 pk_encrypt(uid_t uid, char *remote_name, netobj *remote_key, des_block *key)
109 return (pk_crypt(uid, remote_name, remote_key, key, DES_ENCRYPT));
113 * Decrypt the key using the public key associated with remote_name and the
114 * secret key associated with uid.
117 pk_decrypt(uid_t uid, char *remote_name, netobj *remote_key, des_block *key)
119 return (pk_crypt(uid, remote_name, remote_key, key, DES_DECRYPT));
122 static int store_netname( uid_t, key_netstarg * );
123 static int fetch_netname( uid_t, key_netstarg * );
126 pk_netput(uid_t uid, key_netstarg *netstore)
128 if (!store_netname(uid, netstore)) {
129 return (KEY_SYSTEMERR);
131 return (KEY_SUCCESS);
135 pk_netget(uid_t uid, key_netstarg *netstore)
137 if (!fetch_netname(uid, netstore)) {
138 return (KEY_SYSTEMERR);
140 return (KEY_SUCCESS);
145 * Do the work of pk_encrypt && pk_decrypt
148 pk_crypt(uid_t uid, char *remote_name, netobj *remote_key, des_block *key,
153 char xsecret_hold[1024];
156 BIGNUM *public, *secret, *common;
160 xsecret = fetchsecretkey(uid);
161 if (xsecret == NULL || xsecret[0] == 0) {
162 memset(zero, 0, sizeof (zero));
163 xsecret = xsecret_hold;
165 return (KEY_NOSECRET);
167 if (!getsecretkey("nobody", xsecret, zero) || xsecret[0] == 0) {
168 return (KEY_NOSECRET);
172 memcpy(xpublic, remote_key->n_bytes, remote_key->n_len);
174 bzero((char *)&xpublic, sizeof(xpublic));
175 if (!getpublickey(remote_name, xpublic)) {
176 if (nodefaultkeys || !getpublickey("nobody", xpublic))
177 return (KEY_UNKNOWN);
181 if (!readcache(xpublic, xsecret, &deskey)) {
182 if ((ctx = BN_CTX_new()) == NULL)
183 return (KEY_SYSTEMERR);
184 if (BN_hex2bn(&public, xpublic) == NULL) {
186 return (KEY_SYSTEMERR);
188 if (BN_hex2bn(&secret, xsecret) == NULL) {
191 return (KEY_SYSTEMERR);
194 if ((common = BN_new()) == NULL) {
198 return (KEY_SYSTEMERR);
201 BN_mod_exp(common, public, secret, modulus, ctx);
202 extractdeskey(common, &deskey);
203 writecache(xpublic, xsecret, &deskey);
209 error = ecb_crypt((char *)&deskey, (char *)key, sizeof (des_block),
211 if (DES_FAILED(error)) {
212 return (KEY_SYSTEMERR);
214 return (KEY_SUCCESS);
218 pk_get_conv_key(uid_t uid, keybuf xpublic, cryptkeyres *result)
221 char xsecret_hold[1024];
222 BIGNUM *public, *secret, *common;
227 xsecret = fetchsecretkey(uid);
229 if (xsecret == NULL || xsecret[0] == 0) {
230 memset(zero, 0, sizeof (zero));
231 xsecret = xsecret_hold;
233 return (KEY_NOSECRET);
235 if (!getsecretkey("nobody", xsecret, zero) ||
237 return (KEY_NOSECRET);
240 if (!readcache(xpublic, xsecret, &result->cryptkeyres_u.deskey)) {
241 if ((ctx = BN_CTX_new()) == NULL)
242 return (KEY_SYSTEMERR);
243 if (BN_hex2bn(&public, xpublic) == NULL) {
245 return (KEY_SYSTEMERR);
247 if (BN_hex2bn(&secret, xsecret) == NULL) {
250 return (KEY_SYSTEMERR);
253 if ((common = BN_new()) == NULL) {
257 return (KEY_SYSTEMERR);
260 BN_mod_exp(common, public, secret, modulus, ctx);
262 extractdeskey(common, &result->cryptkeyres_u.deskey);
263 writecache(xpublic, xsecret, &result->cryptkeyres_u.deskey);
270 return (KEY_SUCCESS);
274 * Choose middle 64 bits of the common key to use as our des key, possibly
275 * overwriting the lower order bits by setting parity.
278 extractdeskey(BIGNUM *ck, des_block *deskey)
282 BN_ULONG r, base = (1 << 8);
285 if ((a = BN_dup(ck)) == NULL)
286 errx(1, "could not copy BIGNUM");
288 for (i = 0; i < ((KEYSIZE - 64) / 2) / 8; i++) {
289 r = BN_div_word(a, base);
292 for (i = 0; i < 8; i++) {
293 r = BN_div_word(a, base);
297 des_setparity((char *)deskey);
301 * Key storage management
306 struct secretkey_netname_list {
308 key_netstarg keynetdata;
310 struct secretkey_netname_list *next;
315 static struct secretkey_netname_list *g_secretkey_netname;
318 * Store the keys and netname for this uid
321 store_netname(uid_t uid, key_netstarg *netstore)
323 struct secretkey_netname_list *new;
324 struct secretkey_netname_list **l;
326 for (l = &g_secretkey_netname; *l != NULL && (*l)->uid != uid;
330 new = (struct secretkey_netname_list *)malloc(sizeof (*new));
339 if (new->keynetdata.st_netname)
340 free(new->keynetdata.st_netname);
342 memcpy(new->keynetdata.st_priv_key, netstore->st_priv_key,
344 memcpy(new->keynetdata.st_pub_key, netstore->st_pub_key, HEXKEYBYTES);
346 if (netstore->st_netname)
347 new->keynetdata.st_netname = strdup(netstore->st_netname);
349 new->keynetdata.st_netname = (char *)NULL;
350 new->sc_flag = KEY_NAME;
356 * Fetch the keys and netname for this uid
360 fetch_netname(uid_t uid, struct key_netstarg *key_netst)
362 struct secretkey_netname_list *l;
364 for (l = g_secretkey_netname; l != NULL; l = l->next) {
365 if ((l->uid == uid) && (l->sc_flag == KEY_NAME)){
367 memcpy(key_netst->st_priv_key,
368 l->keynetdata.st_priv_key, HEXKEYBYTES);
370 memcpy(key_netst->st_pub_key,
371 l->keynetdata.st_pub_key, HEXKEYBYTES);
373 if (l->keynetdata.st_netname)
374 key_netst->st_netname =
375 strdup(l->keynetdata.st_netname);
377 key_netst->st_netname = NULL;
386 fetchsecretkey(uid_t uid)
388 struct secretkey_netname_list *l;
390 for (l = g_secretkey_netname; l != NULL; l = l->next) {
392 return (l->keynetdata.st_priv_key);
399 * Store the secretkey for this uid
402 storesecretkey(uid_t uid, keybuf key)
404 struct secretkey_netname_list *new;
405 struct secretkey_netname_list **l;
407 for (l = &g_secretkey_netname; *l != NULL && (*l)->uid != uid;
411 new = (struct secretkey_netname_list *) malloc(sizeof (*new));
416 new->sc_flag = KEY_ONLY;
417 memset(new->keynetdata.st_pub_key, 0, HEXKEYBYTES);
418 new->keynetdata.st_netname = NULL;
425 memcpy(new->keynetdata.st_priv_key, key,
433 return ("0123456789abcdef"[val]);
437 bin2hex(unsigned char *bin, unsigned char *hex, int size)
441 for (i = 0; i < size; i++) {
442 *hex++ = hexdigit(*bin >> 4);
443 *hex++ = hexdigit(*bin++ & 0xf);
450 if ('0' <= dig && dig <= '9') {
452 } else if ('a' <= dig && dig <= 'f') {
453 return (dig - 'a' + 10);
454 } else if ('A' <= dig && dig <= 'F') {
455 return (dig - 'A' + 10);
462 hex2bin(unsigned char *hex, unsigned char *bin, int size)
466 for (i = 0; i < size; i++) {
467 *bin = hexval(*hex++) << 4;
468 *bin++ |= hexval(*hex++);
473 * Exponential caching management
475 struct cachekey_list {
479 struct cachekey_list *next;
481 static struct cachekey_list *g_cachedkeys;
484 * cache result of expensive multiple precision exponential operation
487 writecache(char *pub, char *sec, des_block *deskey)
489 struct cachekey_list *new;
491 new = (struct cachekey_list *) malloc(sizeof (struct cachekey_list));
495 memcpy(new->public, pub, sizeof (keybuf));
496 memcpy(new->secret, sec, sizeof (keybuf));
497 new->deskey = *deskey;
498 new->next = g_cachedkeys;
503 * Try to find the common key in the cache
506 readcache(char *pub, char *sec, des_block *deskey)
508 struct cachekey_list *found;
509 struct cachekey_list **l;
511 #define cachehit(pub, sec, list) \
512 (memcmp(pub, (list)->public, sizeof (keybuf)) == 0 && \
513 memcmp(sec, (list)->secret, sizeof (keybuf)) == 0)
515 for (l = &g_cachedkeys; (*l) != NULL && !cachehit(pub, sec, *l);
523 found->next = g_cachedkeys;
524 g_cachedkeys = found;
525 *deskey = found->deskey;