1d2493ff77
- getpwent:
o adjunctbuf should be NUL terminated after copying
o _pw_breakout_yp() needs to know the length of the buffer returned
from YP so it can properly NUL terminate its local buffer.
- getgrent:
o YP buffers should be YPMAXRECORD + 2 bytes long and NUL terminated.
(Previously they were hardcoded to 1024 bytes.)
- getnetgrent:
o YP data should be copied with snprintf(), not sprintf()
These are 2.2 candidates. I will wait a few days to make sure these don't
break anything and then, if there are no objections, move them to the 2.2
branch.
554 lines
12 KiB
C
554 lines
12 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. 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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* 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 REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <grp.h>
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static FILE *_gr_fp;
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static struct group _gr_group;
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static int _gr_stayopen;
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static int grscan(), start_gr();
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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static int _gr_stepping_yp;
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static int _gr_yp_enabled;
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static int _getypgroup(struct group *, const char *, char *);
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static int _nextypgroup(struct group *);
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#endif
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/* initial size for malloc and increase steps for realloc */
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#define MAXGRP 64
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#define MAXLINELENGTH 256
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static char **members; /* list of group members */
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static int maxgrp; /* current length of **mebers */
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static char *line; /* temp buffer for group line */
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static int maxlinelength; /* current length of *line */
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/*
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* Lines longer than MAXLINELENGTHLIMIT will be count as an error.
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* <= 0 disable check for maximum line length
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* 256K is enough for 64,000 uids
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*/
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#define MAXLINELENGTHLIMIT (256 * 1024)
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struct group *
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getgrent()
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{
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if (!_gr_fp && !start_gr()) {
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return NULL;
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}
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#ifdef YP
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if (_gr_stepping_yp) {
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if (_nextypgroup(&_gr_group))
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return(&_gr_group);
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}
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tryagain:
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#endif
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if (!grscan(0, 0, NULL))
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return(NULL);
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#ifdef YP
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if(_gr_group.gr_name[0] == '+' && _gr_group.gr_name[1]) {
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_getypgroup(&_gr_group, &_gr_group.gr_name[1],
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"group.byname");
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} else if(_gr_group.gr_name[0] == '+') {
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if (!_nextypgroup(&_gr_group))
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goto tryagain;
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else
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return(&_gr_group);
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}
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#endif
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return(&_gr_group);
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}
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struct group *
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getgrnam(name)
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const char *name;
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{
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int rval;
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if (!start_gr())
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return(NULL);
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#ifdef YP
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tryagain:
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#endif
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rval = grscan(1, 0, name);
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#ifdef YP
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if(rval == -1 && (_gr_yp_enabled < 0 || (_gr_yp_enabled &&
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_gr_group.gr_name[0] == '+'))) {
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if (!(rval = _getypgroup(&_gr_group, name, "group.byname")))
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goto tryagain;
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}
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#endif
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if (!_gr_stayopen)
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endgrent();
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return(rval ? &_gr_group : NULL);
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}
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struct group *
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#ifdef __STDC__
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getgrgid(gid_t gid)
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#else
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getgrgid(gid)
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gid_t gid;
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#endif
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{
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int rval;
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if (!start_gr())
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return(NULL);
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#ifdef YP
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tryagain:
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#endif
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rval = grscan(1, gid, NULL);
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#ifdef YP
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if(rval == -1 && _gr_yp_enabled) {
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char buf[16];
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snprintf(buf, sizeof buf, "%d", (unsigned)gid);
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if (!(rval = _getypgroup(&_gr_group, buf, "group.bygid")))
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goto tryagain;
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}
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#endif
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if (!_gr_stayopen)
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endgrent();
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return(rval ? &_gr_group : NULL);
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}
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static int
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start_gr()
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{
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if (_gr_fp) {
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rewind(_gr_fp);
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return(1);
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}
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_gr_fp = fopen(_PATH_GROUP, "r");
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if(!_gr_fp) return 0;
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#ifdef YP
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/*
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* This is a disgusting hack, used to determine when YP is enabled.
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* This would be easier if we had a group database to go along with
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* the password database.
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*/
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{
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char *line;
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size_t linelen;
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_gr_yp_enabled = 0;
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while((line = fgetln(_gr_fp, &linelen)) != NULL) {
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if(line[0] == '+') {
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if(line[1] && line[1] != ':' && !_gr_yp_enabled) {
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_gr_yp_enabled = 1;
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} else {
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_gr_yp_enabled = -1;
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break;
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}
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}
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}
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rewind(_gr_fp);
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}
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#endif
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if (maxlinelength == 0) {
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if ((line = (char *)malloc(sizeof(char) *
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MAXLINELENGTH)) == NULL)
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return(0);
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maxlinelength += MAXLINELENGTH;
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}
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if (maxgrp == 0) {
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if ((members = (char **)malloc(sizeof(char **) *
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MAXGRP)) == NULL)
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return(0);
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maxgrp += MAXGRP;
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}
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return 1;
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}
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int
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setgrent()
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{
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return(setgroupent(0));
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}
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int
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setgroupent(stayopen)
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int stayopen;
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{
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if (!start_gr())
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return(0);
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_gr_stayopen = stayopen;
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#ifdef YP
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_gr_stepping_yp = 0;
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#endif
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return(1);
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}
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void
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endgrent()
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{
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#ifdef YP
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_gr_stepping_yp = 0;
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#endif
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if (_gr_fp) {
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(void)fclose(_gr_fp);
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_gr_fp = NULL;
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}
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}
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static int
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grscan(search, gid, name)
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register int search, gid;
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register char *name;
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{
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register char *cp, **m;
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char *bp;
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#ifdef YP
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int _ypfound;
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#endif
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for (;;) {
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#ifdef YP
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_ypfound = 0;
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#endif
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if (fgets(line, maxlinelength, _gr_fp) == NULL)
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return(0);
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if (!index(line, '\n')) {
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do {
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if (feof(_gr_fp))
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return(0);
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/* don't allocate infinite memory */
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if (MAXLINELENGTHLIMIT > 0 &&
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maxlinelength >= MAXLINELENGTHLIMIT)
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return(0);
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if ((line = (char *)realloc(line,
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sizeof(char) *
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(maxlinelength + MAXLINELENGTH))) == NULL)
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return(0);
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if (fgets(line + maxlinelength - 1,
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MAXLINELENGTH + 1, _gr_fp) == NULL)
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return(0);
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maxlinelength += MAXLINELENGTH;
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} while (!index(line + maxlinelength -
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MAXLINELENGTH - 1, '\n'));
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}
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#ifdef GROUP_IGNORE_COMMENTS
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/*
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* Ignore comments: ^[ \t]*#
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*/
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for (cp = line; *cp != '\0'; cp++)
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if (*cp != ' ' && *cp != '\t')
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break;
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if (*cp == '#')
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continue;
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#endif
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bp = line;
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if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL)
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break;
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#ifdef YP
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/*
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* XXX We need to be careful to avoid proceeding
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* past this point under certain circumstances or
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* we risk dereferencing null pointers down below.
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*/
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if (_gr_group.gr_name[0] == '+') {
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if (strlen(_gr_group.gr_name) == 1) {
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switch(search) {
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case 0:
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return(1);
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case 1:
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return(-1);
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default:
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return(0);
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}
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} else {
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cp = &_gr_group.gr_name[1];
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if (search && name != NULL)
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if (strcmp(cp, name))
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continue;
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if (!_getypgroup(&_gr_group, cp,
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"group.byname"))
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continue;
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if (search && name == NULL)
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if (gid != _gr_group.gr_gid)
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continue;
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/* We're going to override -- tell the world. */
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_ypfound++;
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}
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}
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#else
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if (_gr_group.gr_name[0] == '+')
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continue;
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#endif /* YP */
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if (search && name) {
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if(strcmp(_gr_group.gr_name, name)) {
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continue;
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}
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}
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#ifdef YP
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if ((cp = strsep(&bp, ":\n")) == NULL)
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if (_ypfound)
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return(1);
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else
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break;
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if (strlen(cp) || !_ypfound)
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_gr_group.gr_passwd = cp;
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#else
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if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL)
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break;
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#endif
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if (!(cp = strsep(&bp, ":\n")))
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#ifdef YP
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if (_ypfound)
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return(1);
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else
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#endif
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continue;
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#ifdef YP
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/*
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* Hurm. Should we be doing this? We allow UIDs to
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* be overridden -- what about GIDs?
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*/
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if (!_ypfound)
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#endif
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_gr_group.gr_gid = atoi(cp);
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if (search && name == NULL && _gr_group.gr_gid != gid)
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continue;
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cp = NULL;
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if (bp == NULL) /* !!! Must check for this! */
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break;
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#ifdef YP
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if ((cp = strsep(&bp, ":\n")) == NULL)
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break;
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if (!strlen(cp) && _ypfound)
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return(1);
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else
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members[0] = NULL;
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bp = cp;
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cp = NULL;
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#endif
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for (m = members; ; bp++) {
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if (m == (members + maxgrp - 1)) {
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if ((members = (char **)
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realloc(members,
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sizeof(char **) *
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(maxgrp + MAXGRP))) == NULL)
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return(0);
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m = members + maxgrp - 1;
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maxgrp += MAXGRP;
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}
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if (*bp == ',') {
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if (cp) {
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*bp = '\0';
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*m++ = cp;
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cp = NULL;
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}
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} else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
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if (cp) {
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*bp = '\0';
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*m++ = cp;
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}
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break;
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} else if (cp == NULL)
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cp = bp;
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}
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_gr_group.gr_mem = members;
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*m = NULL;
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return(1);
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}
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/* NOTREACHED */
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return (0);
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}
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#ifdef YP
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static int
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_gr_breakout_yp(struct group *gr, char *result)
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{
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char *s, *cp;
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char **m;
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/*
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* XXX If 's' ends up being a NULL pointer, punt on this group.
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* It means the NIS group entry is badly formatted and should
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* be skipped.
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*/
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if ((s = strsep(&result, ":")) == NULL) return 0; /* name */
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gr->gr_name = s;
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if ((s = strsep(&result, ":")) == NULL) return 0; /* password */
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gr->gr_passwd = s;
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if ((s = strsep(&result, ":")) == NULL) return 0; /* gid */
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gr->gr_gid = atoi(s);
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if ((s = result) == NULL) return 0;
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cp = 0;
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for (m = members; ; s++) {
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if (m == members + maxgrp - 1) {
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if ((members = (char **)realloc(members,
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sizeof(char **) * (maxgrp + MAXGRP))) == NULL)
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return(0);
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m = members + maxgrp - 1;
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maxgrp += MAXGRP;
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}
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if (*s == ',') {
|
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if (cp) {
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*s = '\0';
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*m++ = cp;
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cp = NULL;
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}
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} else if (*s == '\0' || *s == '\n' || *s == ' ') {
|
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if (cp) {
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*s = '\0';
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*m++ = cp;
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}
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break;
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} else if (cp == NULL) {
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cp = s;
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}
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}
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_gr_group.gr_mem = members;
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*m = NULL;
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return 1;
|
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}
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|
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static char *_gr_yp_domain;
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|
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static int
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_getypgroup(struct group *gr, const char *name, char *map)
|
|
{
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|
char *result, *s;
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static char resultbuf[YPMAXRECORD + 2];
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int resultlen;
|
|
|
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if(!_gr_yp_domain) {
|
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if(yp_get_default_domain(&_gr_yp_domain))
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return 0;
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|
}
|
|
|
|
if(yp_match(_gr_yp_domain, map, name, strlen(name),
|
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&result, &resultlen))
|
|
return 0;
|
|
|
|
s = strchr(result, '\n');
|
|
if(s) *s = '\0';
|
|
|
|
if(resultlen >= sizeof resultbuf) return 0;
|
|
strncpy(resultbuf, result, resultlen);
|
|
resultbuf[resultlen] = '\0';
|
|
free(result);
|
|
return(_gr_breakout_yp(gr, resultbuf));
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|
|
}
|
|
|
|
|
|
static int
|
|
_nextypgroup(struct group *gr)
|
|
{
|
|
static char *key;
|
|
static int keylen;
|
|
char *lastkey, *result;
|
|
static char resultbuf[YPMAXRECORD + 2];
|
|
int resultlen;
|
|
int rv;
|
|
|
|
if(!_gr_yp_domain) {
|
|
if(yp_get_default_domain(&_gr_yp_domain))
|
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return 0;
|
|
}
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|
|
|
if(!_gr_stepping_yp) {
|
|
if(key) free(key);
|
|
rv = yp_first(_gr_yp_domain, "group.byname",
|
|
&key, &keylen, &result, &resultlen);
|
|
if(rv) {
|
|
return 0;
|
|
}
|
|
_gr_stepping_yp = 1;
|
|
goto unpack;
|
|
} else {
|
|
tryagain:
|
|
lastkey = key;
|
|
rv = yp_next(_gr_yp_domain, "group.byname", key, keylen,
|
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&key, &keylen, &result, &resultlen);
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|
free(lastkey);
|
|
unpack:
|
|
if(rv) {
|
|
_gr_stepping_yp = 0;
|
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return 0;
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}
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|
|
|
if(resultlen > sizeof(resultbuf)) {
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|
free(result);
|
|
goto tryagain;
|
|
}
|
|
|
|
strncpy(resultbuf, result, resultlen);
|
|
resultbuf[resultlen] = '\0';
|
|
free(result);
|
|
if((result = strchr(resultbuf, '\n')) != NULL)
|
|
*result = '\0';
|
|
if (_gr_breakout_yp(gr, resultbuf))
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|
return(1);
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|
else
|
|
goto tryagain;
|
|
}
|
|
}
|
|
|
|
#endif /* YP */
|