476 lines
12 KiB
C
476 lines
12 KiB
C
/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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/*
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* Copyright (c) 1986-1991 by Sun Microsystems Inc.
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*/
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#ident "@(#)key_call.c 1.25 94/04/24 SMI"
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* key_call.c, Interface to keyserver
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*
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* setsecretkey(key) - set your secret key
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* encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent
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* decryptsessionkey(agent, deskey) - decrypt ditto
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* gendeskey(deskey) - generate a secure des key
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*/
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#include "namespace.h"
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#include "reentrant.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <rpc/rpc.h>
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#include <rpc/auth.h>
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#include <rpc/auth_unix.h>
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#include <rpc/key_prot.h>
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#include <string.h>
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#include <netconfig.h>
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#include <sys/utsname.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <sys/fcntl.h>
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#include "un-namespace.h"
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#define KEY_TIMEOUT 5 /* per-try timeout in seconds */
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#define KEY_NRETRY 12 /* number of retries */
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#ifdef DEBUG
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#define debug(msg) (void) fprintf(stderr, "%s\n", msg);
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#else
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#define debug(msg)
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#endif /* DEBUG */
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/*
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* Hack to allow the keyserver to use AUTH_DES (for authenticated
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* NIS+ calls, for example). The only functions that get called
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* are key_encryptsession_pk, key_decryptsession_pk, and key_gendes.
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*
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* The approach is to have the keyserver fill in pointers to local
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* implementations of these functions, and to call those in key_call().
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*/
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cryptkeyres *(*__key_encryptsession_pk_LOCAL)() = 0;
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cryptkeyres *(*__key_decryptsession_pk_LOCAL)() = 0;
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des_block *(*__key_gendes_LOCAL)() = 0;
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static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *);
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int
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key_setsecret(secretkey)
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const char *secretkey;
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{
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keystatus status;
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if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf,
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(void *)secretkey,
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(xdrproc_t)xdr_keystatus, &status)) {
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return (-1);
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}
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if (status != KEY_SUCCESS) {
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debug("set status is nonzero");
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return (-1);
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}
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return (0);
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}
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/* key_secretkey_is_set() returns 1 if the keyserver has a secret key
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* stored for the caller's effective uid; it returns 0 otherwise
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*
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* N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't
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* be using it, because it allows them to get the user's secret key.
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*/
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int
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key_secretkey_is_set(void)
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{
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struct key_netstres kres;
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memset((void*)&kres, 0, sizeof (kres));
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if (key_call((u_long) KEY_NET_GET, (xdrproc_t)xdr_void, NULL,
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(xdrproc_t)xdr_key_netstres, &kres) &&
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(kres.status == KEY_SUCCESS) &&
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(kres.key_netstres_u.knet.st_priv_key[0] != 0)) {
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/* avoid leaving secret key in memory */
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memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES);
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return (1);
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}
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return (0);
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}
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int
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key_encryptsession_pk(remotename, remotekey, deskey)
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char *remotename;
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netobj *remotekey;
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des_block *deskey;
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{
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cryptkeyarg2 arg;
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cryptkeyres res;
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arg.remotename = remotename;
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arg.remotekey = *remotekey;
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arg.deskey = *deskey;
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if (!key_call((u_long)KEY_ENCRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
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(xdrproc_t)xdr_cryptkeyres, &res)) {
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return (-1);
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}
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if (res.status != KEY_SUCCESS) {
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debug("encrypt status is nonzero");
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return (-1);
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}
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*deskey = res.cryptkeyres_u.deskey;
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return (0);
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}
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int
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key_decryptsession_pk(remotename, remotekey, deskey)
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char *remotename;
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netobj *remotekey;
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des_block *deskey;
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{
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cryptkeyarg2 arg;
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cryptkeyres res;
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arg.remotename = remotename;
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arg.remotekey = *remotekey;
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arg.deskey = *deskey;
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if (!key_call((u_long)KEY_DECRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
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(xdrproc_t)xdr_cryptkeyres, &res)) {
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return (-1);
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}
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if (res.status != KEY_SUCCESS) {
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debug("decrypt status is nonzero");
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return (-1);
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}
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*deskey = res.cryptkeyres_u.deskey;
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return (0);
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}
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int
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key_encryptsession(remotename, deskey)
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const char *remotename;
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des_block *deskey;
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{
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cryptkeyarg arg;
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cryptkeyres res;
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arg.remotename = (char *) remotename;
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arg.deskey = *deskey;
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if (!key_call((u_long)KEY_ENCRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
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(xdrproc_t)xdr_cryptkeyres, &res)) {
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return (-1);
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}
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if (res.status != KEY_SUCCESS) {
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debug("encrypt status is nonzero");
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return (-1);
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}
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*deskey = res.cryptkeyres_u.deskey;
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return (0);
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}
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int
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key_decryptsession(remotename, deskey)
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const char *remotename;
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des_block *deskey;
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{
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cryptkeyarg arg;
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cryptkeyres res;
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arg.remotename = (char *) remotename;
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arg.deskey = *deskey;
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if (!key_call((u_long)KEY_DECRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
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(xdrproc_t)xdr_cryptkeyres, &res)) {
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return (-1);
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}
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if (res.status != KEY_SUCCESS) {
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debug("decrypt status is nonzero");
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return (-1);
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}
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*deskey = res.cryptkeyres_u.deskey;
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return (0);
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}
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int
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key_gendes(key)
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des_block *key;
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{
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if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL,
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(xdrproc_t)xdr_des_block, key)) {
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return (-1);
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}
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return (0);
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}
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int
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key_setnet(arg)
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struct key_netstarg *arg;
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{
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keystatus status;
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if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg,
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(xdrproc_t)xdr_keystatus, &status)){
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return (-1);
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}
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if (status != KEY_SUCCESS) {
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debug("key_setnet status is nonzero");
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return (-1);
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}
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return (1);
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}
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int
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key_get_conv(pkey, deskey)
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char *pkey;
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des_block *deskey;
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{
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cryptkeyres res;
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if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey,
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(xdrproc_t)xdr_cryptkeyres, &res)) {
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return (-1);
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}
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if (res.status != KEY_SUCCESS) {
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debug("get_conv status is nonzero");
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return (-1);
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}
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*deskey = res.cryptkeyres_u.deskey;
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return (0);
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}
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struct key_call_private {
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CLIENT *client; /* Client handle */
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pid_t pid; /* process-id at moment of creation */
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uid_t uid; /* user-id at last authorization */
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};
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static struct key_call_private *key_call_private_main = NULL;
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static void
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key_call_destroy(void *vp)
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{
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struct key_call_private *kcp = (struct key_call_private *)vp;
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if (kcp) {
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if (kcp->client)
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clnt_destroy(kcp->client);
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free(kcp);
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}
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}
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/*
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* Keep the handle cached. This call may be made quite often.
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*/
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static CLIENT *
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getkeyserv_handle(vers)
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int vers;
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{
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void *localhandle;
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struct netconfig *nconf;
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struct netconfig *tpconf;
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struct key_call_private *kcp = key_call_private_main;
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struct timeval wait_time;
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struct utsname u;
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int main_thread;
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int fd;
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static thread_key_t key_call_key;
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extern mutex_t tsd_lock;
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#define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */
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#define TOTAL_TRIES 5 /* Number of tries */
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if ((main_thread = thr_main())) {
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kcp = key_call_private_main;
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} else {
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if (key_call_key == 0) {
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mutex_lock(&tsd_lock);
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if (key_call_key == 0)
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thr_keycreate(&key_call_key, key_call_destroy);
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mutex_unlock(&tsd_lock);
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}
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kcp = (struct key_call_private *)thr_getspecific(key_call_key);
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}
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if (kcp == (struct key_call_private *)NULL) {
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kcp = (struct key_call_private *)malloc(sizeof (*kcp));
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if (kcp == (struct key_call_private *)NULL) {
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return ((CLIENT *) NULL);
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}
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if (main_thread)
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key_call_private_main = kcp;
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else
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thr_setspecific(key_call_key, (void *) kcp);
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kcp->client = NULL;
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}
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/* if pid has changed, destroy client and rebuild */
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if (kcp->client != NULL && kcp->pid != getpid()) {
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clnt_destroy(kcp->client);
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kcp->client = NULL;
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}
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if (kcp->client != NULL) {
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/* if uid has changed, build client handle again */
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if (kcp->uid != geteuid()) {
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kcp->uid = geteuid();
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auth_destroy(kcp->client->cl_auth);
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kcp->client->cl_auth =
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authsys_create("", kcp->uid, 0, 0, NULL);
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if (kcp->client->cl_auth == NULL) {
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clnt_destroy(kcp->client);
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kcp->client = NULL;
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return ((CLIENT *) NULL);
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}
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}
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/* Change the version number to the new one */
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clnt_control(kcp->client, CLSET_VERS, (void *)&vers);
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return (kcp->client);
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}
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if (!(localhandle = setnetconfig())) {
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return ((CLIENT *) NULL);
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}
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tpconf = NULL;
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#if defined(__FreeBSD__)
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if (uname(&u) == -1)
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#else
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#if defined(i386)
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if (_nuname(&u) == -1)
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#elif defined(sparc)
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if (_uname(&u) == -1)
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#else
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#error Unknown architecture!
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#endif
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#endif
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{
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endnetconfig(localhandle);
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return ((CLIENT *) NULL);
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}
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while ((nconf = getnetconfig(localhandle)) != NULL) {
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if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
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/*
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* We use COTS_ORD here so that the caller can
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* find out immediately if the server is dead.
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*/
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if (nconf->nc_semantics == NC_TPI_COTS_ORD) {
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kcp->client = clnt_tp_create(u.nodename,
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KEY_PROG, vers, nconf);
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if (kcp->client)
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break;
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} else {
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tpconf = nconf;
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}
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}
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}
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if ((kcp->client == (CLIENT *) NULL) && (tpconf))
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/* Now, try the CLTS or COTS loopback transport */
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kcp->client = clnt_tp_create(u.nodename,
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KEY_PROG, vers, tpconf);
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endnetconfig(localhandle);
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if (kcp->client == (CLIENT *) NULL) {
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return ((CLIENT *) NULL);
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}
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kcp->uid = geteuid();
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kcp->pid = getpid();
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kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL);
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if (kcp->client->cl_auth == NULL) {
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clnt_destroy(kcp->client);
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kcp->client = NULL;
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return ((CLIENT *) NULL);
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}
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wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES;
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wait_time.tv_usec = 0;
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(void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT,
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(char *)&wait_time);
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if (clnt_control(kcp->client, CLGET_FD, (char *)&fd))
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_fcntl(fd, F_SETFD, 1); /* make it "close on exec" */
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return (kcp->client);
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}
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/* returns 0 on failure, 1 on success */
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static int
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key_call(proc, xdr_arg, arg, xdr_rslt, rslt)
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u_long proc;
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xdrproc_t xdr_arg;
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void *arg;
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xdrproc_t xdr_rslt;
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void *rslt;
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{
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CLIENT *clnt;
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struct timeval wait_time;
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if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) {
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cryptkeyres *res;
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res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg);
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*(cryptkeyres*)rslt = *res;
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return (1);
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} else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) {
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cryptkeyres *res;
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res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg);
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*(cryptkeyres*)rslt = *res;
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return (1);
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} else if (proc == KEY_GEN && __key_gendes_LOCAL) {
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des_block *res;
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res = (*__key_gendes_LOCAL)(geteuid(), 0);
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*(des_block*)rslt = *res;
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return (1);
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}
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if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) ||
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(proc == KEY_NET_GET) || (proc == KEY_NET_PUT) ||
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(proc == KEY_GET_CONV))
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clnt = getkeyserv_handle(2); /* talk to version 2 */
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else
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clnt = getkeyserv_handle(1); /* talk to version 1 */
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if (clnt == NULL) {
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return (0);
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}
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wait_time.tv_sec = TOTAL_TIMEOUT;
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wait_time.tv_usec = 0;
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if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt,
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wait_time) == RPC_SUCCESS) {
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return (1);
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} else {
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return (0);
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}
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}
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