FreeBSD-5.3/usr.sbin/keyserv/keyserv.c
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)keyserv.c 1.15 94/04/25 SMI";
#endif
static const char rcsid[] =
"$FreeBSD: src/usr.sbin/keyserv/keyserv.c,v 1.11 2003/02/18 01:35:58 kris Exp $";
#endif /* not lint */
/*
* Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
*/
/*
* Keyserver
* Store secret keys per uid. Do public key encryption and decryption
* operations. Generate "random" keys.
* Do not talk to anything but a local root
* process on the local transport only
*/
#include <err.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <rpc/rpc.h>
#include <sys/param.h>
#include <sys/file.h>
#include <rpc/des_crypt.h>
#include <rpc/des.h>
#include <rpc/key_prot.h>
#include <rpcsvc/crypt.h>
#include "keyserv.h"
#ifndef NGROUPS
#define NGROUPS 16
#endif
#ifndef KEYSERVSOCK
#define KEYSERVSOCK "/var/run/keyservsock"
#endif
static void randomize __P(( des_block * ));
static void usage __P(( void ));
static int getrootkey __P(( des_block *, int ));
static int root_auth __P(( SVCXPRT *, struct svc_req * ));
#ifdef DEBUG
static int debugging = 1;
#else
static int debugging = 0;
#endif
static void keyprogram();
static des_block masterkey;
char *getenv();
static char ROOTKEY[] = "/etc/.rootkey";
/*
* Hack to allow the keyserver to use AUTH_DES (for authenticated
* NIS+ calls, for example). The only functions that get called
* are key_encryptsession_pk, key_decryptsession_pk, and key_gendes.
*
* The approach is to have the keyserver fill in pointers to local
* implementations of these functions, and to call those in key_call().
*/
extern cryptkeyres *(*__key_encryptsession_pk_LOCAL)();
extern cryptkeyres *(*__key_decryptsession_pk_LOCAL)();
extern des_block *(*__key_gendes_LOCAL)();
extern int (*__des_crypt_LOCAL)();
cryptkeyres *key_encrypt_pk_2_svc_prog __P(( uid_t, cryptkeyarg2 * ));
cryptkeyres *key_decrypt_pk_2_svc_prog __P(( uid_t, cryptkeyarg2 * ));
des_block *key_gen_1_svc_prog __P(( void *, struct svc_req * ));
int
main(argc, argv)
int argc;
char *argv[];
{
int nflag = 0;
int c;
int warn = 0;
char *path = NULL;
void *localhandle;
register SVCXPRT *transp;
struct netconfig *nconf = NULL;
__key_encryptsession_pk_LOCAL = &key_encrypt_pk_2_svc_prog;
__key_decryptsession_pk_LOCAL = &key_decrypt_pk_2_svc_prog;
__key_gendes_LOCAL = &key_gen_1_svc_prog;
while ((c = getopt(argc, argv, "ndDvp:")) != -1)
switch (c) {
case 'n':
nflag++;
break;
case 'd':
pk_nodefaultkeys();
break;
case 'D':
debugging = 1;
break;
case 'v':
warn = 1;
break;
case 'p':
path = optarg;
break;
default:
usage();
}
load_des(warn, path);
__des_crypt_LOCAL = _my_crypt;
if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1)
errx(1, "failed to register AUTH_DES authenticator");
if (optind != argc) {
usage();
}
/*
* Initialize
*/
(void) umask(S_IXUSR|S_IXGRP|S_IXOTH);
if (geteuid() != 0)
errx(1, "keyserv must be run as root");
setmodulus(HEXMODULUS);
getrootkey(&masterkey, nflag);
rpcb_unset(KEY_PROG, KEY_VERS, NULL);
rpcb_unset(KEY_PROG, KEY_VERS2, NULL);
if (svc_create(keyprogram, KEY_PROG, KEY_VERS,
"netpath") == 0) {
(void) fprintf(stderr,
"%s: unable to create service\n", argv[0]);
exit(1);
}
if (svc_create(keyprogram, KEY_PROG, KEY_VERS2,
"netpath") == 0) {
(void) fprintf(stderr,
"%s: unable to create service\n", argv[0]);
exit(1);
}
localhandle = setnetconfig();
while ((nconf = getnetconfig(localhandle)) != NULL) {
if (nconf->nc_protofmly != NULL &&
strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
break;
}
if (nconf == NULL)
errx(1, "getnetconfig: %s", nc_sperror());
unlink(KEYSERVSOCK);
rpcb_unset(CRYPT_PROG, CRYPT_VERS, nconf);
transp = svcunix_create(RPC_ANYSOCK, 0, 0, KEYSERVSOCK);
if (transp == NULL)
errx(1, "cannot create AF_LOCAL service");
if (!svc_reg(transp, KEY_PROG, KEY_VERS, keyprogram, nconf))
errx(1, "unable to register (KEY_PROG, KEY_VERS, unix)");
if (!svc_reg(transp, KEY_PROG, KEY_VERS2, keyprogram, nconf))
errx(1, "unable to register (KEY_PROG, KEY_VERS2, unix)");
if (!svc_reg(transp, CRYPT_PROG, CRYPT_VERS, crypt_prog_1, nconf))
errx(1, "unable to register (CRYPT_PROG, CRYPT_VERS, unix)");
endnetconfig(localhandle);
(void) umask(066); /* paranoia */
if (!debugging) {
daemon(0,0);
}
signal(SIGPIPE, SIG_IGN);
svc_run();
abort();
/* NOTREACHED */
}
/*
* In the event that we don't get a root password, we try to
* randomize the master key the best we can
*/
static void
randomize(master)
des_block *master;
{
#ifndef __FreeBSD__
int i;
int seed;
struct timeval tv;
int shift;
seed = 0;
for (i = 0; i < 1024; i++) {
(void) gettimeofday(&tv, (struct timezone *) NULL);
shift = i % 8 * sizeof (int);
seed ^= (tv.tv_usec << shift) | (tv.tv_usec >> (32 - shift));
}
#endif
#ifdef KEYSERV_RANDOM
#ifdef __FreeBSD__
master->key.low = arc4random();
master->key.high = arc4random();
#else
srandom(seed);
master->key.low = random();
master->key.high = random();
#endif
#else
/* use stupid dangerous bad rand() */
#ifdef __FreeBSD__
sranddev();
#else
srand(seed);
#endif
master->key.low = rand();
master->key.high = rand();
#endif
}
/*
* Try to get root's secret key, by prompting if terminal is a tty, else trying
* from standard input.
* Returns 1 on success.
*/
static int
getrootkey(master, prompt)
des_block *master;
int prompt;
{
char *passwd;
char name[MAXNETNAMELEN + 1];
char secret[HEXKEYBYTES];
key_netstarg netstore;
int fd;
if (!prompt) {
/*
* Read secret key out of ROOTKEY
*/
fd = open(ROOTKEY, O_RDONLY, 0);
if (fd < 0) {
randomize(master);
return (0);
}
if (read(fd, secret, HEXKEYBYTES) < HEXKEYBYTES) {
warnx("the key read from %s was too short", ROOTKEY);
(void) close(fd);
return (0);
}
(void) close(fd);
if (!getnetname(name)) {
warnx(
"failed to generate host's netname when establishing root's key");
return (0);
}
memcpy(netstore.st_priv_key, secret, HEXKEYBYTES);
memset(netstore.st_pub_key, 0, HEXKEYBYTES);
netstore.st_netname = name;
if (pk_netput(0, &netstore) != KEY_SUCCESS) {
warnx("could not set root's key and netname");
return (0);
}
return (1);
}
/*
* Decrypt yellow pages publickey entry to get secret key
*/
passwd = getpass("root password:");
passwd2des(passwd, (char *)master);
getnetname(name);
if (!getsecretkey(name, secret, passwd)) {
warnx("can't find %s's secret key", name);
return (0);
}
if (secret[0] == 0) {
warnx("password does not decrypt secret key for %s", name);
return (0);
}
(void) pk_setkey(0, secret);
/*
* Store it for future use in $ROOTKEY, if possible
*/
fd = open(ROOTKEY, O_WRONLY|O_TRUNC|O_CREAT, 0);
if (fd > 0) {
char newline = '\n';
write(fd, secret, strlen(secret));
write(fd, &newline, sizeof (newline));
close(fd);
}
return (1);
}
/*
* Procedures to implement RPC service
*/
char *
strstatus(status)
keystatus status;
{
switch (status) {
case KEY_SUCCESS:
return ("KEY_SUCCESS");
case KEY_NOSECRET:
return ("KEY_NOSECRET");
case KEY_UNKNOWN:
return ("KEY_UNKNOWN");
case KEY_SYSTEMERR:
return ("KEY_SYSTEMERR");
default:
return ("(bad result code)");
}
}
keystatus *
key_set_1_svc_prog(uid, key)
uid_t uid;
keybuf key;
{
static keystatus status;
if (debugging) {
(void) fprintf(stderr, "set(%ld, %.*s) = ", uid,
(int) sizeof (keybuf), key);
}
status = pk_setkey(uid, key);
if (debugging) {
(void) fprintf(stderr, "%s\n", strstatus(status));
(void) fflush(stderr);
}
return (&status);
}
cryptkeyres *
key_encrypt_pk_2_svc_prog(uid, arg)
uid_t uid;
cryptkeyarg2 *arg;
{
static cryptkeyres res;
if (debugging) {
(void) fprintf(stderr, "encrypt(%ld, %s, %08x%08x) = ", uid,
arg->remotename, arg->deskey.key.high,
arg->deskey.key.low);
}
res.cryptkeyres_u.deskey = arg->deskey;
res.status = pk_encrypt(uid, arg->remotename, &(arg->remotekey),
&res.cryptkeyres_u.deskey);
if (debugging) {
if (res.status == KEY_SUCCESS) {
(void) fprintf(stderr, "%08x%08x\n",
res.cryptkeyres_u.deskey.key.high,
res.cryptkeyres_u.deskey.key.low);
} else {
(void) fprintf(stderr, "%s\n", strstatus(res.status));
}
(void) fflush(stderr);
}
return (&res);
}
cryptkeyres *
key_decrypt_pk_2_svc_prog(uid, arg)
uid_t uid;
cryptkeyarg2 *arg;
{
static cryptkeyres res;
if (debugging) {
(void) fprintf(stderr, "decrypt(%ld, %s, %08x%08x) = ", uid,
arg->remotename, arg->deskey.key.high,
arg->deskey.key.low);
}
res.cryptkeyres_u.deskey = arg->deskey;
res.status = pk_decrypt(uid, arg->remotename, &(arg->remotekey),
&res.cryptkeyres_u.deskey);
if (debugging) {
if (res.status == KEY_SUCCESS) {
(void) fprintf(stderr, "%08x%08x\n",
res.cryptkeyres_u.deskey.key.high,
res.cryptkeyres_u.deskey.key.low);
} else {
(void) fprintf(stderr, "%s\n", strstatus(res.status));
}
(void) fflush(stderr);
}
return (&res);
}
keystatus *
key_net_put_2_svc_prog(uid, arg)
uid_t uid;
key_netstarg *arg;
{
static keystatus status;
if (debugging) {
(void) fprintf(stderr, "net_put(%s, %.*s, %.*s) = ",
arg->st_netname, (int)sizeof (arg->st_pub_key),
arg->st_pub_key, (int)sizeof (arg->st_priv_key),
arg->st_priv_key);
};
status = pk_netput(uid, arg);
if (debugging) {
(void) fprintf(stderr, "%s\n", strstatus(status));
(void) fflush(stderr);
}
return (&status);
}
key_netstres *
key_net_get_2_svc_prog(uid, arg)
uid_t uid;
void *arg;
{
static key_netstres keynetname;
if (debugging)
(void) fprintf(stderr, "net_get(%ld) = ", uid);
keynetname.status = pk_netget(uid, &keynetname.key_netstres_u.knet);
if (debugging) {
if (keynetname.status == KEY_SUCCESS) {
fprintf(stderr, "<%s, %.*s, %.*s>\n",
keynetname.key_netstres_u.knet.st_netname,
(int)sizeof (keynetname.key_netstres_u.knet.st_pub_key),
keynetname.key_netstres_u.knet.st_pub_key,
(int)sizeof (keynetname.key_netstres_u.knet.st_priv_key),
keynetname.key_netstres_u.knet.st_priv_key);
} else {
(void) fprintf(stderr, "NOT FOUND\n");
}
(void) fflush(stderr);
}
return (&keynetname);
}
cryptkeyres *
key_get_conv_2_svc_prog(uid, arg)
uid_t uid;
keybuf arg;
{
static cryptkeyres res;
if (debugging)
(void) fprintf(stderr, "get_conv(%ld, %.*s) = ", uid,
(int)sizeof (arg), arg);
res.status = pk_get_conv_key(uid, arg, &res);
if (debugging) {
if (res.status == KEY_SUCCESS) {
(void) fprintf(stderr, "%08x%08x\n",
res.cryptkeyres_u.deskey.key.high,
res.cryptkeyres_u.deskey.key.low);
} else {
(void) fprintf(stderr, "%s\n", strstatus(res.status));
}
(void) fflush(stderr);
}
return (&res);
}
cryptkeyres *
key_encrypt_1_svc_prog(uid, arg)
uid_t uid;
cryptkeyarg *arg;
{
static cryptkeyres res;
if (debugging) {
(void) fprintf(stderr, "encrypt(%ld, %s, %08x%08x) = ", uid,
arg->remotename, arg->deskey.key.high,
arg->deskey.key.low);
}
res.cryptkeyres_u.deskey = arg->deskey;
res.status = pk_encrypt(uid, arg->remotename, NULL,
&res.cryptkeyres_u.deskey);
if (debugging) {
if (res.status == KEY_SUCCESS) {
(void) fprintf(stderr, "%08x%08x\n",
res.cryptkeyres_u.deskey.key.high,
res.cryptkeyres_u.deskey.key.low);
} else {
(void) fprintf(stderr, "%s\n", strstatus(res.status));
}
(void) fflush(stderr);
}
return (&res);
}
cryptkeyres *
key_decrypt_1_svc_prog(uid, arg)
uid_t uid;
cryptkeyarg *arg;
{
static cryptkeyres res;
if (debugging) {
(void) fprintf(stderr, "decrypt(%ld, %s, %08x%08x) = ", uid,
arg->remotename, arg->deskey.key.high,
arg->deskey.key.low);
}
res.cryptkeyres_u.deskey = arg->deskey;
res.status = pk_decrypt(uid, arg->remotename, NULL,
&res.cryptkeyres_u.deskey);
if (debugging) {
if (res.status == KEY_SUCCESS) {
(void) fprintf(stderr, "%08x%08x\n",
res.cryptkeyres_u.deskey.key.high,
res.cryptkeyres_u.deskey.key.low);
} else {
(void) fprintf(stderr, "%s\n", strstatus(res.status));
}
(void) fflush(stderr);
}
return (&res);
}
/* ARGSUSED */
des_block *
key_gen_1_svc_prog(v, s)
void *v;
struct svc_req *s;
{
struct timeval time;
static des_block keygen;
static des_block key;
(void) gettimeofday(&time, (struct timezone *) NULL);
keygen.key.high += (time.tv_sec ^ time.tv_usec);
keygen.key.low += (time.tv_sec ^ time.tv_usec);
ecb_crypt((char *)&masterkey, (char *)&keygen, sizeof (keygen),
DES_ENCRYPT | DES_HW);
key = keygen;
des_setparity((char *)&key);
if (debugging) {
(void) fprintf(stderr, "gen() = %08x%08x\n", key.key.high,
key.key.low);
(void) fflush(stderr);
}
return (&key);
}
getcredres *
key_getcred_1_svc_prog(uid, name)
uid_t uid;
netnamestr *name;
{
static getcredres res;
static u_int gids[NGROUPS];
struct unixcred *cred;
cred = &res.getcredres_u.cred;
cred->gids.gids_val = gids;
if (!netname2user(*name, (uid_t *) &cred->uid, (gid_t *) &cred->gid,
(int *)&cred->gids.gids_len, (gid_t *)gids)) {
res.status = KEY_UNKNOWN;
} else {
res.status = KEY_SUCCESS;
}
if (debugging) {
(void) fprintf(stderr, "getcred(%s) = ", *name);
if (res.status == KEY_SUCCESS) {
(void) fprintf(stderr, "uid=%d, gid=%d, grouplen=%d\n",
cred->uid, cred->gid, cred->gids.gids_len);
} else {
(void) fprintf(stderr, "%s\n", strstatus(res.status));
}
(void) fflush(stderr);
}
return (&res);
}
/*
* RPC boilerplate
*/
static void
keyprogram(rqstp, transp)
struct svc_req *rqstp;
SVCXPRT *transp;
{
union {
keybuf key_set_1_arg;
cryptkeyarg key_encrypt_1_arg;
cryptkeyarg key_decrypt_1_arg;
netnamestr key_getcred_1_arg;
cryptkeyarg key_encrypt_2_arg;
cryptkeyarg key_decrypt_2_arg;
netnamestr key_getcred_2_arg;
cryptkeyarg2 key_encrypt_pk_2_arg;
cryptkeyarg2 key_decrypt_pk_2_arg;
key_netstarg key_net_put_2_arg;
netobj key_get_conv_2_arg;
} argument;
char *result;
xdrproc_t xdr_argument, xdr_result;
char *(*local) ();
uid_t uid = -1;
int check_auth;
switch (rqstp->rq_proc) {
case NULLPROC:
svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
return;
case KEY_SET:
xdr_argument = (xdrproc_t)xdr_keybuf;
xdr_result = (xdrproc_t)xdr_int;
local = (char *(*)()) key_set_1_svc_prog;
check_auth = 1;
break;
case KEY_ENCRYPT:
xdr_argument = (xdrproc_t)xdr_cryptkeyarg;
xdr_result = (xdrproc_t)xdr_cryptkeyres;
local = (char *(*)()) key_encrypt_1_svc_prog;
check_auth = 1;
break;
case KEY_DECRYPT:
xdr_argument = (xdrproc_t)xdr_cryptkeyarg;
xdr_result = (xdrproc_t)xdr_cryptkeyres;
local = (char *(*)()) key_decrypt_1_svc_prog;
check_auth = 1;
break;
case KEY_GEN:
xdr_argument = (xdrproc_t)xdr_void;
xdr_result = (xdrproc_t)xdr_des_block;
local = (char *(*)()) key_gen_1_svc_prog;
check_auth = 0;
break;
case KEY_GETCRED:
xdr_argument = (xdrproc_t)xdr_netnamestr;
xdr_result = (xdrproc_t)xdr_getcredres;
local = (char *(*)()) key_getcred_1_svc_prog;
check_auth = 0;
break;
case KEY_ENCRYPT_PK:
xdr_argument = (xdrproc_t)xdr_cryptkeyarg2;
xdr_result = (xdrproc_t)xdr_cryptkeyres;
local = (char *(*)()) key_encrypt_pk_2_svc_prog;
check_auth = 1;
break;
case KEY_DECRYPT_PK:
xdr_argument = (xdrproc_t)xdr_cryptkeyarg2;
xdr_result = (xdrproc_t)xdr_cryptkeyres;
local = (char *(*)()) key_decrypt_pk_2_svc_prog;
check_auth = 1;
break;
case KEY_NET_PUT:
xdr_argument = (xdrproc_t)xdr_key_netstarg;
xdr_result = (xdrproc_t)xdr_keystatus;
local = (char *(*)()) key_net_put_2_svc_prog;
check_auth = 1;
break;
case KEY_NET_GET:
xdr_argument = (xdrproc_t) xdr_void;
xdr_result = (xdrproc_t)xdr_key_netstres;
local = (char *(*)()) key_net_get_2_svc_prog;
check_auth = 1;
break;
case KEY_GET_CONV:
xdr_argument = (xdrproc_t) xdr_keybuf;
xdr_result = (xdrproc_t)xdr_cryptkeyres;
local = (char *(*)()) key_get_conv_2_svc_prog;
check_auth = 1;
break;
default:
svcerr_noproc(transp);
return;
}
if (check_auth) {
if (root_auth(transp, rqstp) == 0) {
if (debugging) {
(void) fprintf(stderr,
"not local privileged process\n");
}
svcerr_weakauth(transp);
return;
}
if (rqstp->rq_cred.oa_flavor != AUTH_SYS) {
if (debugging) {
(void) fprintf(stderr,
"not unix authentication\n");
}
svcerr_weakauth(transp);
return;
}
uid = ((struct authsys_parms *)rqstp->rq_clntcred)->aup_uid;
}
memset(&argument, 0, sizeof (argument));
if (!svc_getargs(transp, xdr_argument, &argument)) {
svcerr_decode(transp);
return;
}
result = (*local) (uid, &argument);
if (!svc_sendreply(transp, xdr_result, result)) {
if (debugging)
(void) fprintf(stderr, "unable to reply\n");
svcerr_systemerr(transp);
}
if (!svc_freeargs(transp, xdr_argument, &argument)) {
if (debugging)
(void) fprintf(stderr,
"unable to free arguments\n");
exit(1);
}
return;
}
static int
root_auth(trans, rqstp)
SVCXPRT *trans;
struct svc_req *rqstp;
{
uid_t uid;
struct sockaddr *remote;
remote = svc_getrpccaller(trans)->buf;
if (remote->sa_family != AF_UNIX) {
if (debugging)
fprintf(stderr, "client didn't use AF_UNIX\n");
return (0);
}
if (__rpc_get_local_uid(trans, &uid) < 0) {
if (debugging)
fprintf(stderr, "__rpc_get_local_uid failed\n");
return (0);
}
if (debugging)
fprintf(stderr, "local_uid %ld\n", uid);
if (uid == 0)
return (1);
if (rqstp->rq_cred.oa_flavor == AUTH_SYS) {
if (((uid_t) ((struct authunix_parms *)
rqstp->rq_clntcred)->aup_uid)
== uid) {
return (1);
} else {
if (debugging)
fprintf(stderr,
"local_uid %ld mismatches auth %ld\n", uid,
((uid_t) ((struct authunix_parms *)rqstp->rq_clntcred)->aup_uid));
return (0);
}
} else {
if (debugging)
fprintf(stderr, "Not auth sys\n");
return (0);
}
}
static void
usage()
{
(void) fprintf(stderr,
"usage: keyserv [-n] [-D] [-d] [-v] [-p path]\n");
(void) fprintf(stderr, "-d disables the use of default keys\n");
exit(1);
}