8a16b7a18f
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462 lines
12 KiB
C
462 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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#include "mt_misc.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)(uid_t, void *arg) = 0;
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cryptkeyres *(*__key_decryptsession_pk_LOCAL)(uid_t, void *arg) = 0;
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des_block *(*__key_gendes_LOCAL)(uid_t, void *) = 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(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(char *remotename, netobj *remotekey, 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(char *remotename, netobj *remotekey, 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(const char *remotename, 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(const char *remotename, 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(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(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(char *pkey, 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 thread_key_t key_call_key;
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static once_t key_call_once = ONCE_INITIALIZER;
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static int key_call_key_error;
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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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static void
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key_call_init(void)
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{
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key_call_key_error = thr_keycreate(&key_call_key, key_call_destroy);
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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(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;
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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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#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 (thr_once(&key_call_once, key_call_init) != 0 ||
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key_call_key_error != 0)
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return ((CLIENT *) NULL);
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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(u_long proc, xdrproc_t xdr_arg, void *arg, 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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