cd7b8d78c7
and gids bigger than 16 bits. Added checks for uids and gids that are bigger than 32 bits. Approved by: jkh (partly, this fix is bigger than I first intended)
175 lines
5.1 KiB
C
175 lines
5.1 KiB
C
/*-
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* Copyright (c) 1990, 1993, 1994
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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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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)pw_scan.c 8.3 (Berkeley) 4/2/94";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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/*
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* This module is used to "verify" password entries by chpass(1) and
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* pwd_mkdb(8).
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*/
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#include <sys/param.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "pw_scan.h"
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/*
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* Some software assumes that IDs are short. We should emit warnings
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* for id's which can not be stored in a short, but we are more liberal
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* by default, warning for IDs greater than USHRT_MAX.
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*
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* If pw_big_ids_warning is anything other than -1 on entry to pw_scan()
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* it will be set based on the existance of PW_SCAN_BIG_IDS in the
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* environment.
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*/
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int pw_big_ids_warning = -1;
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int
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pw_scan(bp, pw)
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char *bp;
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struct passwd *pw;
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{
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uid_t id;
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int root;
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char *p, *sh;
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if (pw_big_ids_warning == -1)
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pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0;
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pw->pw_fields = 0;
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if (!(pw->pw_name = strsep(&bp, ":"))) /* login */
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goto fmt;
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root = !strcmp(pw->pw_name, "root");
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if(pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0'))
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pw->pw_fields |= _PWF_NAME;
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if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */
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goto fmt;
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if(pw->pw_passwd[0]) pw->pw_fields |= _PWF_PASSWD;
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if (!(p = strsep(&bp, ":"))) /* uid */
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goto fmt;
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if (p[0])
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pw->pw_fields |= _PWF_UID;
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else {
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if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') {
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warnx("no uid for user %s", pw->pw_name);
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return (0);
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}
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}
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id = strtoul(p, (char **)NULL, 10);
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if (errno == ERANGE) {
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warnx("%s > max uid value (%u)", p, ULONG_MAX);
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return (0);
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}
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if (root && id) {
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warnx("root uid should be 0");
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return (0);
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}
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if (pw_big_ids_warning && id > USHRT_MAX) {
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warnx("%s > recommended max uid value (%u)", p, USHRT_MAX);
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/*return (0);*/ /* THIS SHOULD NOT BE FATAL! */
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}
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pw->pw_uid = id;
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if (!(p = strsep(&bp, ":"))) /* gid */
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goto fmt;
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if(p[0]) pw->pw_fields |= _PWF_GID;
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id = strtoul(p, (char **)NULL, 10);
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if (errno == ERANGE) {
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warnx("%s > max gid value (%u)", p, ULONG_MAX);
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return (0);
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}
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if (pw_big_ids_warning && id > USHRT_MAX) {
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warnx("%s > recommended max gid value (%u)", p, USHRT_MAX);
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/* return (0); This should not be fatal! */
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}
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pw->pw_gid = id;
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pw->pw_class = strsep(&bp, ":"); /* class */
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if(pw->pw_class[0]) pw->pw_fields |= _PWF_CLASS;
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if (!(p = strsep(&bp, ":"))) /* change */
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goto fmt;
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if(p[0]) pw->pw_fields |= _PWF_CHANGE;
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pw->pw_change = atol(p);
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if (!(p = strsep(&bp, ":"))) /* expire */
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goto fmt;
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if(p[0]) pw->pw_fields |= _PWF_EXPIRE;
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pw->pw_expire = atol(p);
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if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */
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goto fmt;
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if(pw->pw_gecos[0]) pw->pw_fields |= _PWF_GECOS;
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if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */
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goto fmt;
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if(pw->pw_dir[0]) pw->pw_fields |= _PWF_DIR;
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if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */
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goto fmt;
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p = pw->pw_shell;
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if (root && *p) /* empty == /bin/sh */
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for (setusershell();;) {
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if (!(sh = getusershell())) {
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warnx("warning, unknown root shell");
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break;
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}
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if (!strcmp(p, sh))
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break;
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}
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if(p[0]) pw->pw_fields |= _PWF_SHELL;
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if ((p = strsep(&bp, ":"))) { /* too many */
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fmt: warnx("corrupted entry");
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return (0);
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}
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return (1);
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}
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