8a16b7a18f
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529 lines
14 KiB
C
529 lines
14 KiB
C
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/*
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* Copyright (c) 1988 by Sun Microsystems, Inc.
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*/
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/*-
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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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* svcauth_des.c, server-side des authentication
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*
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* We insure for the service the following:
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* (1) The timestamp microseconds do not exceed 1 million.
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* (2) The timestamp plus the window is less than the current time.
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* (3) The timestamp is not less than the one previously
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* seen in the current session.
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*
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* It is up to the server to determine if the window size is
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* too small .
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*
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*/
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#include "namespace.h"
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#include "reentrant.h"
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <rpc/des_crypt.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#include <rpc/auth.h>
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#include <rpc/auth_des.h>
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#include <rpc/svc.h>
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#include <rpc/rpc_msg.h>
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#include <rpc/svc_auth.h>
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#include "libc_private.h"
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)svcauth_des.c 2.3 89/07/11 4.0 RPCSRC; from 1.15 88/02/08 SMI";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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extern int key_decryptsession_pk(const char *, netobj *, des_block *);
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#define debug(msg) printf("svcauth_des: %s\n", msg)
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#define USEC_PER_SEC ((u_long) 1000000L)
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#define BEFORE(t1, t2) timercmp(t1, t2, <)
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/*
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* LRU cache of conversation keys and some other useful items.
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*/
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#define AUTHDES_CACHESZ 64
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struct cache_entry {
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des_block key; /* conversation key */
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char *rname; /* client's name */
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u_int window; /* credential lifetime window */
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struct timeval laststamp; /* detect replays of creds */
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char *localcred; /* generic local credential */
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};
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static struct cache_entry *authdes_cache/* [AUTHDES_CACHESZ] */;
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static short *authdes_lru/* [AUTHDES_CACHESZ] */;
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static void cache_init(void); /* initialize the cache */
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static short cache_spot(des_block *, char *, struct timeval *); /* find an entry in the cache */
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static void cache_ref(short sid); /* note that sid was ref'd */
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static void invalidate(char *); /* invalidate entry in cache */
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/*
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* cache statistics
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*/
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static struct {
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u_long ncachehits; /* times cache hit, and is not replay */
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u_long ncachereplays; /* times cache hit, and is replay */
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u_long ncachemisses; /* times cache missed */
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} svcauthdes_stats;
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/*
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* Service side authenticator for AUTH_DES
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*/
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enum auth_stat
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_svcauth_des(struct svc_req *rqst, struct rpc_msg *msg)
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{
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long *ixdr;
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des_block cryptbuf[2];
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struct authdes_cred *cred;
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struct authdes_verf verf;
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int status;
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struct cache_entry *entry;
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short sid = 0;
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des_block *sessionkey;
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des_block ivec;
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u_int window;
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struct timeval timestamp;
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u_long namelen;
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struct area {
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struct authdes_cred area_cred;
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char area_netname[MAXNETNAMELEN+1];
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} *area;
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if (authdes_cache == NULL) {
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cache_init();
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}
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area = (struct area *)rqst->rq_clntcred;
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cred = (struct authdes_cred *)&area->area_cred;
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/*
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* Get the credential
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*/
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ixdr = (long *)msg->rm_call.cb_cred.oa_base;
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cred->adc_namekind = IXDR_GET_ENUM(ixdr, enum authdes_namekind);
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switch (cred->adc_namekind) {
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case ADN_FULLNAME:
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namelen = IXDR_GET_U_LONG(ixdr);
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if (namelen > MAXNETNAMELEN) {
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return (AUTH_BADCRED);
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}
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cred->adc_fullname.name = area->area_netname;
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bcopy((char *)ixdr, cred->adc_fullname.name,
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(u_int)namelen);
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cred->adc_fullname.name[namelen] = 0;
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ixdr += (RNDUP(namelen) / BYTES_PER_XDR_UNIT);
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cred->adc_fullname.key.key.high = (u_long)*ixdr++;
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cred->adc_fullname.key.key.low = (u_long)*ixdr++;
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cred->adc_fullname.window = (u_long)*ixdr++;
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break;
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case ADN_NICKNAME:
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cred->adc_nickname = (u_long)*ixdr++;
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break;
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default:
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return (AUTH_BADCRED);
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}
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/*
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* Get the verifier
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*/
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ixdr = (long *)msg->rm_call.cb_verf.oa_base;
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verf.adv_xtimestamp.key.high = (u_long)*ixdr++;
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verf.adv_xtimestamp.key.low = (u_long)*ixdr++;
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verf.adv_int_u = (u_long)*ixdr++;
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/*
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* Get the conversation key
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*/
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if (cred->adc_namekind == ADN_FULLNAME) {
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netobj pkey;
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char pkey_data[1024];
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sessionkey = &cred->adc_fullname.key;
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if (! getpublickey(cred->adc_fullname.name, pkey_data)) {
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debug("getpublickey");
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return(AUTH_BADCRED);
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}
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pkey.n_bytes = pkey_data;
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pkey.n_len = strlen(pkey_data) + 1;
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if (key_decryptsession_pk(cred->adc_fullname.name, &pkey,
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sessionkey) < 0) {
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debug("decryptsessionkey");
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return (AUTH_BADCRED); /* key not found */
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}
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} else { /* ADN_NICKNAME */
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sid = (short)cred->adc_nickname;
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if (sid < 0 || sid >= AUTHDES_CACHESZ) {
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debug("bad nickname");
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return (AUTH_BADCRED); /* garbled credential */
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}
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sessionkey = &authdes_cache[sid].key;
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}
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/*
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* Decrypt the timestamp
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*/
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cryptbuf[0] = verf.adv_xtimestamp;
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if (cred->adc_namekind == ADN_FULLNAME) {
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cryptbuf[1].key.high = cred->adc_fullname.window;
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cryptbuf[1].key.low = verf.adv_winverf;
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ivec.key.high = ivec.key.low = 0;
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status = cbc_crypt((char *)sessionkey, (char *)cryptbuf,
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2*sizeof(des_block), DES_DECRYPT | DES_HW,
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(char *)&ivec);
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} else {
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status = ecb_crypt((char *)sessionkey, (char *)cryptbuf,
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sizeof(des_block), DES_DECRYPT | DES_HW);
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}
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if (DES_FAILED(status)) {
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debug("decryption failure");
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return (AUTH_FAILED); /* system error */
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}
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/*
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* XDR the decrypted timestamp
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*/
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ixdr = (long *)cryptbuf;
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timestamp.tv_sec = IXDR_GET_LONG(ixdr);
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timestamp.tv_usec = IXDR_GET_LONG(ixdr);
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/*
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* Check for valid credentials and verifiers.
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* They could be invalid because the key was flushed
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* out of the cache, and so a new session should begin.
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* Be sure and send AUTH_REJECTED{CRED, VERF} if this is the case.
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*/
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{
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struct timeval current;
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int nick;
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int winverf;
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if (cred->adc_namekind == ADN_FULLNAME) {
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window = IXDR_GET_U_LONG(ixdr);
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winverf = IXDR_GET_U_LONG(ixdr);
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if (winverf != window - 1) {
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debug("window verifier mismatch");
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return (AUTH_BADCRED); /* garbled credential */
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}
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sid = cache_spot(sessionkey, cred->adc_fullname.name,
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×tamp);
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if (sid < 0) {
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debug("replayed credential");
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return (AUTH_REJECTEDCRED); /* replay */
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}
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nick = 0;
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} else { /* ADN_NICKNAME */
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window = authdes_cache[sid].window;
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nick = 1;
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}
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if ((u_long)timestamp.tv_usec >= USEC_PER_SEC) {
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debug("invalid usecs");
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/* cached out (bad key), or garbled verifier */
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return (nick ? AUTH_REJECTEDVERF : AUTH_BADVERF);
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}
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if (nick && BEFORE(×tamp,
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&authdes_cache[sid].laststamp)) {
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debug("timestamp before last seen");
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return (AUTH_REJECTEDVERF); /* replay */
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}
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(void)gettimeofday(¤t, NULL);
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current.tv_sec -= window; /* allow for expiration */
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if (!BEFORE(¤t, ×tamp)) {
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debug("timestamp expired");
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/* replay, or garbled credential */
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return (nick ? AUTH_REJECTEDVERF : AUTH_BADCRED);
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}
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}
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/*
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* Set up the reply verifier
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*/
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verf.adv_nickname = (u_long)sid;
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/*
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* xdr the timestamp before encrypting
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*/
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ixdr = (long *)cryptbuf;
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IXDR_PUT_LONG(ixdr, timestamp.tv_sec - 1);
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IXDR_PUT_LONG(ixdr, timestamp.tv_usec);
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/*
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* encrypt the timestamp
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*/
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status = ecb_crypt((char *)sessionkey, (char *)cryptbuf,
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sizeof(des_block), DES_ENCRYPT | DES_HW);
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if (DES_FAILED(status)) {
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debug("encryption failure");
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return (AUTH_FAILED); /* system error */
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}
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verf.adv_xtimestamp = cryptbuf[0];
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/*
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* Serialize the reply verifier, and update rqst
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*/
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ixdr = (long *)msg->rm_call.cb_verf.oa_base;
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*ixdr++ = (long)verf.adv_xtimestamp.key.high;
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*ixdr++ = (long)verf.adv_xtimestamp.key.low;
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*ixdr++ = (long)verf.adv_int_u;
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rqst->rq_xprt->xp_verf.oa_flavor = AUTH_DES;
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rqst->rq_xprt->xp_verf.oa_base = msg->rm_call.cb_verf.oa_base;
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rqst->rq_xprt->xp_verf.oa_length =
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(char *)ixdr - msg->rm_call.cb_verf.oa_base;
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/*
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* We succeeded, commit the data to the cache now and
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* finish cooking the credential.
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*/
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entry = &authdes_cache[sid];
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entry->laststamp = timestamp;
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cache_ref(sid);
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if (cred->adc_namekind == ADN_FULLNAME) {
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cred->adc_fullname.window = window;
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cred->adc_nickname = (u_long)sid; /* save nickname */
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if (entry->rname != NULL) {
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mem_free(entry->rname, strlen(entry->rname) + 1);
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}
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entry->rname = (char *)mem_alloc((u_int)strlen(cred->adc_fullname.name)
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+ 1);
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if (entry->rname != NULL) {
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(void) strcpy(entry->rname, cred->adc_fullname.name);
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} else {
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debug("out of memory");
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}
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entry->key = *sessionkey;
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entry->window = window;
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invalidate(entry->localcred); /* mark any cached cred invalid */
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} else { /* ADN_NICKNAME */
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/*
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* nicknames are cooked into fullnames
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*/
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cred->adc_namekind = ADN_FULLNAME;
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cred->adc_fullname.name = entry->rname;
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cred->adc_fullname.key = entry->key;
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cred->adc_fullname.window = entry->window;
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}
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return (AUTH_OK); /* we made it!*/
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}
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/*
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* Initialize the cache
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*/
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static void
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cache_init(void)
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{
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int i;
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authdes_cache = (struct cache_entry *)
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mem_alloc(sizeof(struct cache_entry) * AUTHDES_CACHESZ);
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bzero((char *)authdes_cache,
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sizeof(struct cache_entry) * AUTHDES_CACHESZ);
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authdes_lru = (short *)mem_alloc(sizeof(short) * AUTHDES_CACHESZ);
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/*
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* Initialize the lru list
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*/
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for (i = 0; i < AUTHDES_CACHESZ; i++) {
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authdes_lru[i] = i;
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}
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}
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/*
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* Find the lru victim
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*/
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static short
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cache_victim(void)
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{
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return (authdes_lru[AUTHDES_CACHESZ-1]);
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}
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/*
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* Note that sid was referenced
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*/
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static void
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cache_ref(short sid)
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{
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int i;
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short curr;
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short prev;
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prev = authdes_lru[0];
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authdes_lru[0] = sid;
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for (i = 1; prev != sid; i++) {
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curr = authdes_lru[i];
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authdes_lru[i] = prev;
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prev = curr;
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}
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}
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/*
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* Find a spot in the cache for a credential containing
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* the items given. Return -1 if a replay is detected, otherwise
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* return the spot in the cache.
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*/
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static short
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cache_spot(des_block *key, char *name, struct timeval *timestamp)
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{
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struct cache_entry *cp;
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int i;
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u_long hi;
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hi = key->key.high;
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for (cp = authdes_cache, i = 0; i < AUTHDES_CACHESZ; i++, cp++) {
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if (cp->key.key.high == hi &&
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cp->key.key.low == key->key.low &&
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cp->rname != NULL &&
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bcmp(cp->rname, name, strlen(name) + 1) == 0) {
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if (BEFORE(timestamp, &cp->laststamp)) {
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svcauthdes_stats.ncachereplays++;
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return (-1); /* replay */
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}
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svcauthdes_stats.ncachehits++;
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return (i); /* refresh */
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}
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}
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svcauthdes_stats.ncachemisses++;
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return (cache_victim()); /* new credential */
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}
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#if (defined(sun) || defined(vax) || defined(__FreeBSD__))
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/*
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* Local credential handling stuff.
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* NOTE: bsd unix dependent.
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* Other operating systems should put something else here.
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*/
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#define UNKNOWN -2 /* grouplen, if cached cred is unknown user */
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#define INVALID -1 /* grouplen, if cache entry is invalid */
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struct bsdcred {
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uid_t uid; /* cached uid */
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gid_t gid; /* cached gid */
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int grouplen; /* length of cached groups */
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gid_t groups[NGRPS]; /* cached groups */
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};
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/*
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* Map a des credential into a unix cred.
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* We cache the credential here so the application does
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* not have to make an rpc call every time to interpret
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* the credential.
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*/
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int
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authdes_getucred(struct authdes_cred *adc, uid_t *uid, gid_t *gid,
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int *grouplen, gid_t *groups)
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{
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unsigned sid;
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int i;
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uid_t i_uid;
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gid_t i_gid;
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int i_grouplen;
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struct bsdcred *cred;
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sid = adc->adc_nickname;
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if (sid >= AUTHDES_CACHESZ) {
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debug("invalid nickname");
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return (0);
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}
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cred = (struct bsdcred *)authdes_cache[sid].localcred;
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if (cred == NULL) {
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cred = (struct bsdcred *)mem_alloc(sizeof(struct bsdcred));
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authdes_cache[sid].localcred = (char *)cred;
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cred->grouplen = INVALID;
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}
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if (cred->grouplen == INVALID) {
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/*
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* not in cache: lookup
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*/
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if (!netname2user(adc->adc_fullname.name, &i_uid, &i_gid,
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&i_grouplen, groups))
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{
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debug("unknown netname");
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cred->grouplen = UNKNOWN; /* mark as lookup up, but not found */
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return (0);
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}
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debug("missed ucred cache");
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*uid = cred->uid = i_uid;
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*gid = cred->gid = i_gid;
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*grouplen = cred->grouplen = i_grouplen;
|
|
for (i = i_grouplen - 1; i >= 0; i--) {
|
|
cred->groups[i] = groups[i]; /* int to short */
|
|
}
|
|
return (1);
|
|
} else if (cred->grouplen == UNKNOWN) {
|
|
/*
|
|
* Already lookup up, but no match found
|
|
*/
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* cached credentials
|
|
*/
|
|
*uid = cred->uid;
|
|
*gid = cred->gid;
|
|
*grouplen = cred->grouplen;
|
|
for (i = cred->grouplen - 1; i >= 0; i--) {
|
|
groups[i] = cred->groups[i]; /* short to int */
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
static void
|
|
invalidate(char *cred)
|
|
{
|
|
if (cred == NULL) {
|
|
return;
|
|
}
|
|
((struct bsdcred *)cred)->grouplen = INVALID;
|
|
}
|
|
#endif
|
|
|