fed7420ced
avoid creating bad entries in the grp list as a result of memory allocation failures while building new entries. PR: bin/83340 Reviewed by: delphij (prior version of patch)
657 lines
17 KiB
C
657 lines
17 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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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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* 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[] = "@(#)getnetgrent.c 8.2 (Berkeley) 4/27/95";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ctype.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 <unistd.h>
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#ifdef YP
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/*
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* Notes:
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* We want to be able to use NIS netgroups properly while retaining
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* the ability to use a local /etc/netgroup file. Unfortunately, you
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* can't really do both at the same time - at least, not efficiently.
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* NetBSD deals with this problem by creating a netgroup database
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* using Berkeley DB (just like the password database) that allows
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* for lookups using netgroup, netgroup.byuser or netgroup.byhost
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* searches. This is a neat idea, but I don't have time to implement
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* something like that now. (I think ultimately it would be nice
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* if we DB-fied the group and netgroup stuff all in one shot, but
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* for now I'm satisfied just to have something that works well
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* without requiring massive code changes.)
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*
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* Therefore, to still permit the use of the local file and maintain
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* optimum NIS performance, we allow for the following conditions:
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*
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* - If /etc/netgroup does not exist and NIS is turned on, we use
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* NIS netgroups only.
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*
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* - If /etc/netgroup exists but is empty, we use NIS netgroups
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* only.
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*
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* - If /etc/netgroup exists and contains _only_ a '+', we use
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* NIS netgroups only.
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*
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* - If /etc/netgroup exists, contains locally defined netgroups
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* and a '+', we use a mixture of NIS and the local entries.
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* This method should return the same NIS data as just using
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* NIS alone, but it will be slower if the NIS netgroup database
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* is large (innetgr() in particular will suffer since extra
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* processing has to be done in order to determine memberships
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* using just the raw netgroup data).
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*
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* - If /etc/netgroup exists and contains only locally defined
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* netgroup entries, we use just those local entries and ignore
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* NIS (this is the original, pre-NIS behavior).
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*/
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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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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <sys/errno.h>
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static char *_netgr_yp_domain;
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int _use_only_yp;
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static int _netgr_yp_enabled;
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static int _yp_innetgr;
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#endif
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#ifndef _PATH_NETGROUP
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#define _PATH_NETGROUP "/etc/netgroup"
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#endif
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/*
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* Static Variables and functions used by setnetgrent(), getnetgrent() and
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* endnetgrent().
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* There are two linked lists:
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* - linelist is just used by setnetgrent() to parse the net group file via.
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* parse_netgrp()
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* - netgrp is the list of entries for the current netgroup
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*/
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struct linelist {
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struct linelist *l_next; /* Chain ptr. */
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int l_parsed; /* Flag for cycles */
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char *l_groupname; /* Name of netgroup */
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char *l_line; /* Netgroup entrie(s) to be parsed */
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};
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struct netgrp {
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struct netgrp *ng_next; /* Chain ptr */
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char *ng_str[3]; /* Field pointers, see below */
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};
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#define NG_HOST 0 /* Host name */
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#define NG_USER 1 /* User name */
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#define NG_DOM 2 /* and Domain name */
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static struct linelist *linehead = (struct linelist *)0;
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static struct netgrp *nextgrp = (struct netgrp *)0;
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static struct {
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struct netgrp *gr;
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char *grname;
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} grouphead = {
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(struct netgrp *)0,
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(char *)0,
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};
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static FILE *netf = (FILE *)0;
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static int parse_netgrp(const char *);
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static struct linelist *read_for_group(const char *);
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void setnetgrent(const char *);
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void endnetgrent(void);
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int getnetgrent(char **, char **, char **);
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int innetgr(const char *, const char *, const char *, const char *);
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#define LINSIZ 1024 /* Length of netgroup file line */
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/*
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* setnetgrent()
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* Parse the netgroup file looking for the netgroup and build the list
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* of netgrp structures. Let parse_netgrp() and read_for_group() do
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* most of the work.
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*/
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void
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setnetgrent(const char *group)
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{
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#ifdef YP
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struct stat _yp_statp;
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char _yp_plus;
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#endif
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/* Sanity check */
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if (group == NULL || !strlen(group))
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return;
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if (grouphead.gr == (struct netgrp *)0 ||
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strcmp(group, grouphead.grname)) {
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endnetgrent();
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#ifdef YP
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/* Presumed guilty until proven innocent. */
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_use_only_yp = 0;
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/*
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* If /etc/netgroup doesn't exist or is empty,
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* use NIS exclusively.
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*/
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if (((stat(_PATH_NETGROUP, &_yp_statp) < 0) &&
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errno == ENOENT) || _yp_statp.st_size == 0)
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_use_only_yp = _netgr_yp_enabled = 1;
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if ((netf = fopen(_PATH_NETGROUP,"r")) != NULL ||_use_only_yp){
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/*
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* Icky: grab the first character of the netgroup file
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* and turn on NIS if it's a '+'. rewind the stream
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* afterwards so we don't goof up read_for_group() later.
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*/
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if (netf) {
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fscanf(netf, "%c", &_yp_plus);
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rewind(netf);
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if (_yp_plus == '+')
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_use_only_yp = _netgr_yp_enabled = 1;
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}
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/*
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* If we were called specifically for an innetgr()
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* lookup and we're in NIS-only mode, short-circuit
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* parse_netgroup() and cut directly to the chase.
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*/
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if (_use_only_yp && _yp_innetgr) {
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/* dohw! */
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if (netf != NULL)
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fclose(netf);
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return;
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}
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#else
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if ((netf = fopen(_PATH_NETGROUP, "r"))) {
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#endif
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if (parse_netgrp(group))
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endnetgrent();
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else {
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grouphead.grname = strdup(group);
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}
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if (netf)
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fclose(netf);
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}
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}
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nextgrp = grouphead.gr;
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}
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/*
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* Get the next netgroup off the list.
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*/
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int
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getnetgrent(char **hostp, char **userp, char **domp)
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{
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#ifdef YP
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_yp_innetgr = 0;
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#endif
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if (nextgrp) {
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*hostp = nextgrp->ng_str[NG_HOST];
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*userp = nextgrp->ng_str[NG_USER];
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*domp = nextgrp->ng_str[NG_DOM];
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nextgrp = nextgrp->ng_next;
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return (1);
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}
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return (0);
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}
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/*
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* endnetgrent() - cleanup
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*/
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void
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endnetgrent(void)
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{
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struct linelist *lp, *olp;
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struct netgrp *gp, *ogp;
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lp = linehead;
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while (lp) {
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olp = lp;
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lp = lp->l_next;
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free(olp->l_groupname);
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free(olp->l_line);
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free((char *)olp);
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}
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linehead = (struct linelist *)0;
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if (grouphead.grname) {
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free(grouphead.grname);
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grouphead.grname = (char *)0;
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}
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gp = grouphead.gr;
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while (gp) {
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ogp = gp;
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gp = gp->ng_next;
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if (ogp->ng_str[NG_HOST])
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free(ogp->ng_str[NG_HOST]);
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if (ogp->ng_str[NG_USER])
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free(ogp->ng_str[NG_USER]);
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if (ogp->ng_str[NG_DOM])
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free(ogp->ng_str[NG_DOM]);
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free((char *)ogp);
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}
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grouphead.gr = (struct netgrp *)0;
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nextgrp = (struct netgrp *)0;
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#ifdef YP
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_netgr_yp_enabled = 0;
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#endif
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}
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#ifdef YP
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static int
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_listmatch(const char *list, const char *group, int len)
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{
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const char *ptr = list;
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const char *cptr;
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int glen = strlen(group);
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/* skip possible leading whitespace */
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while(isspace((unsigned char)*ptr))
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ptr++;
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while (ptr < list + len) {
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cptr = ptr;
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while(*ptr != ',' && *ptr != '\0' && !isspace((unsigned char)*ptr))
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ptr++;
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if (strncmp(cptr, group, glen) == 0 && glen == (ptr - cptr))
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return (1);
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while(*ptr == ',' || isspace((unsigned char)*ptr))
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ptr++;
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}
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return (0);
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}
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static int
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_revnetgr_lookup(char* lookupdom, char* map, const char* str,
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const char* dom, const char* group)
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{
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int y, rv, rot;
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char key[MAXHOSTNAMELEN];
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char *result;
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int resultlen;
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for (rot = 0; ; rot++) {
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switch (rot) {
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case(0):
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snprintf(key, MAXHOSTNAMELEN, "%s.%s", str,
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dom ? dom : lookupdom);
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break;
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case(1):
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snprintf(key, MAXHOSTNAMELEN, "%s.*", str);
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break;
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case(2):
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snprintf(key, MAXHOSTNAMELEN, "*.%s",
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dom ? dom : lookupdom);
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break;
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case(3):
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snprintf(key, MAXHOSTNAMELEN, "*.*");
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break;
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default: return (0);
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}
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y = yp_match(lookupdom, map, key, strlen(key), &result,
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&resultlen);
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if (y == 0) {
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rv = _listmatch(result, group, resultlen);
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free(result);
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if (rv) return (1);
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} else if (y != YPERR_KEY) {
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/*
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* If we get an error other than 'no
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* such key in map' then something is
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* wrong and we should stop the search.
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*/
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return (-1);
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}
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}
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}
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#endif
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/*
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* Search for a match in a netgroup.
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*/
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int
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innetgr(const char *group, const char *host, const char *user, const char *dom)
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{
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char *hst, *usr, *dm;
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/* Sanity check */
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if (group == NULL || !strlen(group))
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return (0);
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#ifdef YP
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_yp_innetgr = 1;
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#endif
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setnetgrent(group);
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#ifdef YP
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_yp_innetgr = 0;
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/*
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* If we're in NIS-only mode, do the search using
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* NIS 'reverse netgroup' lookups.
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*
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* What happens with 'reverse netgroup' lookups:
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*
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* 1) try 'reverse netgroup' lookup
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* 1.a) if host is specified and user is null:
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* look in netgroup.byhost
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* (try host.domain, host.*, *.domain or *.*)
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* if found, return yes
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* 1.b) if user is specified and host is null:
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* look in netgroup.byuser
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* (try host.domain, host.*, *.domain or *.*)
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* if found, return yes
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* 1.c) if both host and user are specified,
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* don't do 'reverse netgroup' lookup. It won't work.
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* 1.d) if neither host ane user are specified (why?!?)
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* don't do 'reverse netgroup' lookup either.
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* 2) if domain is specified and 'reverse lookup' is done:
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* 'reverse lookup' was authoritative. bye bye.
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* 3) otherwise, too bad, try it the slow way.
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*/
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if (_use_only_yp && (host == NULL) != (user == NULL)) {
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int ret;
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if(yp_get_default_domain(&_netgr_yp_domain))
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return (0);
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ret = _revnetgr_lookup(_netgr_yp_domain,
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host?"netgroup.byhost":"netgroup.byuser",
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host?host:user, dom, group);
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if (ret == 1)
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return (1);
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else if (ret == 0 && dom != NULL)
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return (0);
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}
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setnetgrent(group);
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#endif /* YP */
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while (getnetgrent(&hst, &usr, &dm))
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if ((host == NULL || hst == NULL || !strcmp(host, hst)) &&
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(user == NULL || usr == NULL || !strcmp(user, usr)) &&
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( dom == NULL || dm == NULL || !strcmp(dom, dm))) {
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endnetgrent();
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return (1);
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}
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endnetgrent();
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return (0);
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}
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/*
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* Parse the netgroup file setting up the linked lists.
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*/
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static int
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parse_netgrp(const char *group)
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{
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char *spos, *epos;
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int len, strpos;
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#ifdef DEBUG
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int fields;
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#endif
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char *pos, *gpos;
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struct netgrp *grp;
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struct linelist *lp = linehead;
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/*
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* First, see if the line has already been read in.
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*/
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while (lp) {
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if (!strcmp(group, lp->l_groupname))
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break;
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lp = lp->l_next;
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}
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if (lp == (struct linelist *)0 &&
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(lp = read_for_group(group)) == (struct linelist *)0)
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return (1);
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if (lp->l_parsed) {
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#ifdef DEBUG
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/*
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* This error message is largely superflous since the
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* code handles the error condition sucessfully, and
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* spewing it out from inside libc can actually hose
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* certain programs.
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*/
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fprintf(stderr, "Cycle in netgroup %s\n", lp->l_groupname);
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#endif
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return (1);
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} else
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lp->l_parsed = 1;
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pos = lp->l_line;
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/* Watch for null pointer dereferences, dammit! */
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while (pos != NULL && *pos != '\0') {
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if (*pos == '(') {
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grp = (struct netgrp *)malloc(sizeof (struct netgrp));
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if (grp == NULL)
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return (1);
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bzero((char *)grp, sizeof (struct netgrp));
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pos++;
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gpos = strsep(&pos, ")");
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#ifdef DEBUG
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fields = 0;
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#endif
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for (strpos = 0; strpos < 3; strpos++) {
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if ((spos = strsep(&gpos, ","))) {
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#ifdef DEBUG
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fields++;
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#endif
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while (*spos == ' ' || *spos == '\t')
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spos++;
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if ((epos = strpbrk(spos, " \t"))) {
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*epos = '\0';
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len = epos - spos;
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} else
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len = strlen(spos);
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if (len > 0) {
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grp->ng_str[strpos] = (char *)
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malloc(len + 1);
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if (grp->ng_str[strpos] == NULL) {
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int freepos;
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for (freepos = 0; freepos < strpos; freepos++)
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free(grp->ng_str[freepos]);
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free(grp);
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return (1);
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}
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bcopy(spos, grp->ng_str[strpos],
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len + 1);
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}
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} else {
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/*
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* All other systems I've tested
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* return NULL for empty netgroup
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* fields. It's up to user programs
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* to handle the NULLs appropriately.
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*/
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grp->ng_str[strpos] = NULL;
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}
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}
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grp->ng_next = grouphead.gr;
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grouphead.gr = grp;
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#ifdef DEBUG
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/*
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* Note: on other platforms, malformed netgroup
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* entries are not normally flagged. While we
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* can catch bad entries and report them, we should
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* stay silent by default for compatibility's sake.
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*/
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if (fields < 3)
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fprintf(stderr, "Bad entry (%s%s%s%s%s) in netgroup \"%s\"\n",
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grp->ng_str[NG_HOST] == NULL ? "" : grp->ng_str[NG_HOST],
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grp->ng_str[NG_USER] == NULL ? "" : ",",
|
|
grp->ng_str[NG_USER] == NULL ? "" : grp->ng_str[NG_USER],
|
|
grp->ng_str[NG_DOM] == NULL ? "" : ",",
|
|
grp->ng_str[NG_DOM] == NULL ? "" : grp->ng_str[NG_DOM],
|
|
lp->l_groupname);
|
|
#endif
|
|
} else {
|
|
spos = strsep(&pos, ", \t");
|
|
if (parse_netgrp(spos))
|
|
continue;
|
|
}
|
|
if (pos == NULL)
|
|
break;
|
|
while (*pos == ' ' || *pos == ',' || *pos == '\t')
|
|
pos++;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Read the netgroup file and save lines until the line for the netgroup
|
|
* is found. Return 1 if eof is encountered.
|
|
*/
|
|
static struct linelist *
|
|
read_for_group(const char *group)
|
|
{
|
|
char *pos, *spos, *linep;
|
|
int len, olen;
|
|
int cont;
|
|
struct linelist *lp;
|
|
char line[LINSIZ + 2];
|
|
#ifdef YP
|
|
char *result;
|
|
int resultlen;
|
|
linep = NULL;
|
|
|
|
while (_netgr_yp_enabled || fgets(line, LINSIZ, netf) != NULL) {
|
|
if (_netgr_yp_enabled) {
|
|
if(!_netgr_yp_domain)
|
|
if(yp_get_default_domain(&_netgr_yp_domain))
|
|
continue;
|
|
if (yp_match(_netgr_yp_domain, "netgroup", group,
|
|
strlen(group), &result, &resultlen)) {
|
|
free(result);
|
|
if (_use_only_yp)
|
|
return ((struct linelist *)0);
|
|
else {
|
|
_netgr_yp_enabled = 0;
|
|
continue;
|
|
}
|
|
}
|
|
snprintf(line, LINSIZ, "%s %s", group, result);
|
|
free(result);
|
|
}
|
|
#else
|
|
linep = NULL;
|
|
while (fgets(line, LINSIZ, netf) != NULL) {
|
|
#endif
|
|
pos = (char *)&line;
|
|
#ifdef YP
|
|
if (*pos == '+') {
|
|
_netgr_yp_enabled = 1;
|
|
continue;
|
|
}
|
|
#endif
|
|
if (*pos == '#')
|
|
continue;
|
|
while (*pos == ' ' || *pos == '\t')
|
|
pos++;
|
|
spos = pos;
|
|
while (*pos != ' ' && *pos != '\t' && *pos != '\n' &&
|
|
*pos != '\0')
|
|
pos++;
|
|
len = pos - spos;
|
|
while (*pos == ' ' || *pos == '\t')
|
|
pos++;
|
|
if (*pos != '\n' && *pos != '\0') {
|
|
lp = (struct linelist *)malloc(sizeof (*lp));
|
|
if (lp == NULL)
|
|
return (NULL);
|
|
lp->l_parsed = 0;
|
|
lp->l_groupname = (char *)malloc(len + 1);
|
|
if (lp->l_groupname == NULL) {
|
|
free(lp);
|
|
return (NULL);
|
|
}
|
|
bcopy(spos, lp->l_groupname, len);
|
|
*(lp->l_groupname + len) = '\0';
|
|
len = strlen(pos);
|
|
olen = 0;
|
|
|
|
/*
|
|
* Loop around handling line continuations.
|
|
*/
|
|
do {
|
|
if (*(pos + len - 1) == '\n')
|
|
len--;
|
|
if (*(pos + len - 1) == '\\') {
|
|
len--;
|
|
cont = 1;
|
|
} else
|
|
cont = 0;
|
|
if (len > 0) {
|
|
linep = (char *)reallocf(linep, olen + len + 1);
|
|
if (linep == NULL) {
|
|
free(lp->l_groupname);
|
|
free(lp);
|
|
return (NULL);
|
|
}
|
|
bcopy(pos, linep + olen, len);
|
|
olen += len;
|
|
*(linep + olen) = '\0';
|
|
}
|
|
if (cont) {
|
|
if (fgets(line, LINSIZ, netf)) {
|
|
pos = line;
|
|
len = strlen(pos);
|
|
} else
|
|
cont = 0;
|
|
}
|
|
} while (cont);
|
|
lp->l_line = linep;
|
|
lp->l_next = linehead;
|
|
linehead = lp;
|
|
|
|
/*
|
|
* If this is the one we wanted, we are done.
|
|
*/
|
|
if (!strcmp(lp->l_groupname, group))
|
|
return (lp);
|
|
}
|
|
}
|
|
#ifdef YP
|
|
/*
|
|
* Yucky. The recursive nature of this whole mess might require
|
|
* us to make more than one pass through the netgroup file.
|
|
* This might be best left outside the #ifdef YP, but YP is
|
|
* defined by default anyway, so I'll leave it like this
|
|
* until I know better.
|
|
*/
|
|
rewind(netf);
|
|
#endif
|
|
return (NULL);
|
|
}
|