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/* $OpenBSD: yppasswdd_mkpw.c,v 1.27 2004/04/20 23:21:23 millert Exp $ */
/*
* Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef LINT
static char rcsid[] = "$OpenBSD: yppasswdd_mkpw.c,v 1.27 2004/04/20 23:21:23 millert Exp $";
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <fcntl.h>
#include <rpc/rpc.h>
#include <rpcsvc/yppasswd.h>
#include <db.h>
#include <pwd.h>
#include <stdlib.h>
#include <unistd.h>
#include <util.h>
#include <ctype.h>
#include <string.h>
#include <syslog.h>
extern int noshell;
extern int nogecos;
extern int nopw;
extern int make;
extern char make_arg[];
extern char *dir;
char *ok_shell(char *);
int badchars(char *);
int subst(char *, char, char);
int make_passwd(yppasswd *);
char *
ok_shell(char *name)
{
char *p, *sh;
setusershell();
while ((sh = getusershell())) {
if (!strcmp(name, sh))
return (name);
/* allow just shell name, but use "real" path */
if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
return (sh);
}
return (NULL);
}
int
badchars(char *base)
{
int ampr = 0;
char *s;
for (s = base; *s; s++) {
if (*s == '&')
ampr++;
if (!isprint(*s))
return 1;
if (strchr(":\n\t\r", *s))
return 1;
}
if (ampr > 10)
return 1;
return 0;
}
int
subst(char *s, char from, char to)
{
int n = 0;
while (*s) {
if (*s == from) {
*s = to;
n++;
}
s++;
}
return (n);
}
int
make_passwd(yppasswd *argp)
{
struct passwd pw;
int pfd = -1, tfd;
char buf[11], *bp = NULL, *p, *t;
int n;
ssize_t cnt;
size_t resid;
struct stat st;
char *master;
pw_init();
if (dir)
pw_setdir(dir);
master = pw_file(_PATH_MASTERPASSWD);
if (!master)
return (1);
pfd = open(master, O_RDONLY);
if (pfd < 0)
goto fail;
if (fstat(pfd, &st))
goto fail;
p = bp = malloc((resid = st.st_size) + 1);
if (bp == NULL)
goto fail;
do {
cnt = read(pfd, p, resid);
if (cnt < 0)
goto fail;
p += cnt;
resid -= cnt;
} while (resid > 0);
close(pfd);
pfd = -1;
*p = '\0'; /* Buf oflow prevention */
p = bp;
subst(p, '\n', '\0');
for (n = 1; p < bp + st.st_size; n++, p = t) {
t = strchr(p, '\0') + 1;
cnt = subst(p, ':', '\0');
if (cnt != 9) {
syslog(LOG_WARNING, "bad entry at line %d of %s", n,
master);
continue;
}
if (strcmp(p, argp->newpw.pw_name) == 0)
break;
}
if (p >= bp + st.st_size)
goto fail;
#define EXPAND(e) e = p; while (*p++);
EXPAND(pw.pw_name);
EXPAND(pw.pw_passwd);
pw.pw_uid = atoi(p); EXPAND(t);
pw.pw_gid = atoi(p); EXPAND(t);
EXPAND(pw.pw_class);
pw.pw_change = (time_t)atol(p); EXPAND(t);
pw.pw_expire = (time_t)atol(p); EXPAND(t);
EXPAND(pw.pw_gecos);
EXPAND(pw.pw_dir);
EXPAND(pw.pw_shell);
if (strcmp(crypt(argp->oldpass, pw.pw_passwd), pw.pw_passwd) != 0)
goto fail;
if (!nopw && badchars(argp->newpw.pw_passwd))
goto fail;
if (!nogecos && badchars(argp->newpw.pw_gecos))
goto fail;
if (!nogecos && badchars(argp->newpw.pw_shell))
goto fail;
if (!ok_shell(argp->newpw.pw_shell) || !ok_shell(pw.pw_shell))
goto fail;
/*
* Get the new password. Reset passwd change time to zero; when
* classes are implemented, go and get the "offset" value for this
* class and reset the timer.
*/
if (!nopw) {
pw.pw_passwd = argp->newpw.pw_passwd;
pw.pw_change = 0;
}
if (!nogecos)
pw.pw_gecos = argp->newpw.pw_gecos;
if (!noshell)
pw.pw_shell = argp->newpw.pw_shell;
for (n = 0, p = pw.pw_gecos; *p; p++) {
if (*p == '&')
n = n + strlen(pw.pw_name) - 1;
}
if (strlen(pw.pw_name) + 1 + strlen(pw.pw_passwd) + 1 +
strlen((snprintf(buf, sizeof buf, "%u", pw.pw_uid), buf)) + 1 +
strlen((snprintf(buf, sizeof buf, "%u", pw.pw_gid), buf)) + 1 +
strlen(pw.pw_gecos) + n + 1 + strlen(pw.pw_dir) + 1 +
strlen(pw.pw_shell) >= 1023)
goto fail;
pfd = open(master, O_RDONLY, 0);
if (pfd < 0) {
syslog(LOG_ERR, "cannot open %s", master);
goto fail;
}
tfd = pw_lock(0);
if (tfd < 0)
goto fail;
pw_copy(pfd, tfd, &pw, NULL);
pw_mkdb(pw.pw_name, 0);
free(bp);
if (fork() == 0) {
chdir("/var/yp");
(void)umask(022);
system(make_arg);
exit(0);
}
return (0);
fail:
if (bp)
free(bp);
if (pfd >= 0)
close(pfd);
free(master);
return (1);
}
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