|
|
/* $OpenBSD: passwd.c,v 1.12.2.2 1997/11/17 22:52:03 millert Exp $ */
|
|
|
|
|
|
/*
|
|
|
* Copyright (c) 1987, 1993, 1994, 1995
|
|
|
* The Regents of the University of California. All rights reserved.
|
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|
*
|
|
|
* 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.
|
|
|
* 3. All advertising materials mentioning features or use of this software
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|
* must display the following acknowledgement:
|
|
|
* This product includes software developed by the University of
|
|
|
* 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
|
|
|
* 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
|
|
|
* SUCH DAMAGE.
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|
*/
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|
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
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|
static char rcsid[] = "$OpenBSD: passwd.c,v 1.12.2.2 1997/11/17 22:52:03 millert Exp $";
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|
#endif /* LIBC_SCCS and not lint */
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|
|
#include <sys/types.h>
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|
|
#include <sys/stat.h>
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|
|
#include <sys/time.h>
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|
|
#include <sys/resource.h>
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|
|
#include <sys/wait.h>
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|
|
|
|
|
#include <fcntl.h>
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|
|
#include <unistd.h>
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|
|
#include <stdlib.h>
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|
|
#include <stdio.h>
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|
|
#include <string.h>
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|
|
#include <pwd.h>
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|
|
#include <errno.h>
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|
|
#include <paths.h>
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|
|
#include <signal.h>
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|
|
#include <limits.h>
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|
|
|
|
#include "util.h"
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|
|
|
|
#define NUM_OPTIONS 2 /* Number of hardcoded defaults */
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|
|
|
|
static void pw_cont __P((int sig));
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|
|
|
static const char options[NUM_OPTIONS][2][80] =
|
|
|
{
|
|
|
{"localcipher", "blowfish,4"},
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|
|
{"ypcipher", "old"}
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|
|
};
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|
|
static char pw_defdir[] = "/etc";
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|
static char *pw_dir = pw_defdir;
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|
static char *pw_lck;
|
|
|
|
|
|
/* Removes trailers. */
|
|
|
static void
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|
|
remove_trailing_space(line)
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|
|
char *line;
|
|
|
{
|
|
|
char *p;
|
|
|
/* Remove trailing spaces */
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|
|
p = line;
|
|
|
while (isspace(*p))
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|
p++;
|
|
|
memcpy(line, p, strlen(p) + 1);
|
|
|
|
|
|
p = line + strlen(line) - 1;
|
|
|
while (isspace(*p))
|
|
|
p--;
|
|
|
*(p + 1) = '\0';
|
|
|
}
|
|
|
|
|
|
|
|
|
/* Get one line, remove trailers */
|
|
|
static int
|
|
|
read_line(fp, line, max)
|
|
|
FILE *fp;
|
|
|
char *line;
|
|
|
int max;
|
|
|
{
|
|
|
char *p, *c;
|
|
|
/* Read one line of config */
|
|
|
if (fgets(line, max, fp) == 0)
|
|
|
return 0;
|
|
|
if (!(p = strchr(line, '\n'))) {
|
|
|
warnx("line too long");
|
|
|
return 0;
|
|
|
}
|
|
|
*p = '\0';
|
|
|
|
|
|
/* Remove comments */
|
|
|
if ((p = strchr(line, '#')))
|
|
|
*p = '\0';
|
|
|
|
|
|
remove_trailing_space(line);
|
|
|
return 1;
|
|
|
}
|
|
|
|
|
|
|
|
|
static const char *
|
|
|
pw_default(option)
|
|
|
char *option;
|
|
|
{
|
|
|
int i;
|
|
|
for (i = 0; i < NUM_OPTIONS; i++)
|
|
|
if (!strcmp(options[i][0], option))
|
|
|
return options[i][1];
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
char *
|
|
|
pw_file(nm)
|
|
|
const char *nm;
|
|
|
{
|
|
|
const char *p = strrchr(nm, '/');
|
|
|
char *new_nm;
|
|
|
|
|
|
if (p)
|
|
|
p++;
|
|
|
else
|
|
|
p = nm;
|
|
|
new_nm = malloc(strlen(pw_dir) + strlen(p) + 2);
|
|
|
if (!new_nm)
|
|
|
return NULL;
|
|
|
sprintf(new_nm, "%s/%s", pw_dir, p);
|
|
|
return new_nm;
|
|
|
}
|
|
|
|
|
|
|
|
|
/*
|
|
|
* Retrieve password information from the /etc/passwd.conf file,
|
|
|
* at the moment this is only for choosing the cipher to use.
|
|
|
* It could easily be used for other authentication methods as
|
|
|
* well.
|
|
|
*/
|
|
|
void
|
|
|
pw_getconf(data, max, key, option)
|
|
|
char *data;
|
|
|
size_t max;
|
|
|
const char *key;
|
|
|
const char *option;
|
|
|
{
|
|
|
FILE *fp;
|
|
|
char line[LINE_MAX];
|
|
|
static char result[LINE_MAX];
|
|
|
char *p;
|
|
|
int got = 0;
|
|
|
int found = 0;
|
|
|
|
|
|
result[0] = '\0';
|
|
|
|
|
|
p = pw_file(_PATH_PASSWDCONF);
|
|
|
if (!p || (fp = fopen(p, "r")) == NULL) {
|
|
|
if (p)
|
|
|
free(p);
|
|
|
if((p = (char *)pw_default(option))) {
|
|
|
strncpy(data, p, max - 1);
|
|
|
data[max - 1] = '\0';
|
|
|
} else
|
|
|
data[0] = '\0';
|
|
|
return;
|
|
|
}
|
|
|
free(p);
|
|
|
|
|
|
while (!found && (got || read_line(fp, line, LINE_MAX))) {
|
|
|
got = 0;
|
|
|
if (strncmp(key, line, strlen(key)) ||
|
|
|
line[strlen(key)] != ':')
|
|
|
continue;
|
|
|
|
|
|
/* Now we found our specified key */
|
|
|
while (read_line(fp, line, LINE_MAX)) {
|
|
|
char *p2;
|
|
|
/* Leaving key field */
|
|
|
if (strchr(line, ':')) {
|
|
|
got = 1;
|
|
|
break;
|
|
|
}
|
|
|
p2 = line;
|
|
|
if (!(p = strsep(&p2, "=")) || p2 == NULL)
|
|
|
continue;
|
|
|
remove_trailing_space(p);
|
|
|
if (!strncmp(p, option, strlen(option))) {
|
|
|
remove_trailing_space(p2);
|
|
|
strcpy(result, p2);
|
|
|
found = 1;
|
|
|
break;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
fclose(fp);
|
|
|
|
|
|
/*
|
|
|
* If we got no result and were looking for a default
|
|
|
* value, try hard coded defaults.
|
|
|
*/
|
|
|
|
|
|
if (!strlen(result) && !strcmp(key,"default") &&
|
|
|
(p=(char *)pw_default(option)))
|
|
|
strncpy(data, p, max - 1);
|
|
|
else
|
|
|
strncpy(data, result, max - 1);
|
|
|
data[max - 1] = '\0';
|
|
|
}
|
|
|
|
|
|
|
|
|
void
|
|
|
pw_setdir(dir)
|
|
|
const char *dir;
|
|
|
{
|
|
|
char *p;
|
|
|
|
|
|
if (strcmp (dir, pw_dir) == 0)
|
|
|
return;
|
|
|
if (pw_dir != pw_defdir)
|
|
|
free(pw_dir);
|
|
|
pw_dir = strdup(dir);
|
|
|
if (pw_lck) {
|
|
|
p = pw_file(pw_lck);
|
|
|
free(pw_lck);
|
|
|
pw_lck = p;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
|
|
|
int
|
|
|
pw_lock(retries)
|
|
|
int retries;
|
|
|
{
|
|
|
int i, fd;
|
|
|
mode_t old_mode;
|
|
|
|
|
|
if (!pw_lck)
|
|
|
return (-1);
|
|
|
/* Acquire the lock file. */
|
|
|
old_mode = umask(0);
|
|
|
fd = open(pw_lck, O_WRONLY|O_CREAT|O_EXCL, 0600);
|
|
|
for (i = 0; i < retries && fd < 0 && errno == EEXIST; i++) {
|
|
|
sleep(1);
|
|
|
fd = open(pw_lck, O_WRONLY|O_CREAT|O_EXCL, 0600);
|
|
|
}
|
|
|
umask(old_mode);
|
|
|
return (fd);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
pw_mkdb()
|
|
|
{
|
|
|
int pstat;
|
|
|
pid_t pid;
|
|
|
char *lock;
|
|
|
struct stat sb;
|
|
|
|
|
|
/* A zero length passwd file is never ok */
|
|
|
if (pw_lck && stat(pw_lck, &sb) == 0) {
|
|
|
if (sb.st_size == 0) {
|
|
|
warnx("%s is zero length", pw_lck);
|
|
|
return (-1);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pid = vfork();
|
|
|
if (pid == 0) {
|
|
|
if (pw_lck)
|
|
|
execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-d", pw_dir,
|
|
|
pw_lck, NULL);
|
|
|
_exit(1);
|
|
|
}
|
|
|
pid = waitpid(pid, &pstat, 0);
|
|
|
if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0)
|
|
|
return (-1);
|
|
|
return (0);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
pw_abort()
|
|
|
{
|
|
|
return (pw_lck ? unlink(pw_lck) : -1);
|
|
|
}
|
|
|
|
|
|
/* Everything below this point is intended for the convenience of programs
|
|
|
* which allow a user to interactively edit the passwd file. Errors in the
|
|
|
* routines below will cause the process to abort. */
|
|
|
|
|
|
static pid_t editpid = -1;
|
|
|
|
|
|
static void
|
|
|
pw_cont(sig)
|
|
|
int sig;
|
|
|
{
|
|
|
|
|
|
if (editpid != -1)
|
|
|
kill(editpid, sig);
|
|
|
}
|
|
|
|
|
|
void
|
|
|
pw_init()
|
|
|
{
|
|
|
struct rlimit rlim;
|
|
|
|
|
|
/* Unlimited resource limits. */
|
|
|
rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
|
|
|
(void)setrlimit(RLIMIT_CPU, &rlim);
|
|
|
(void)setrlimit(RLIMIT_FSIZE, &rlim);
|
|
|
(void)setrlimit(RLIMIT_STACK, &rlim);
|
|
|
(void)setrlimit(RLIMIT_DATA, &rlim);
|
|
|
(void)setrlimit(RLIMIT_RSS, &rlim);
|
|
|
|
|
|
/* Don't drop core (not really necessary, but GP's). */
|
|
|
rlim.rlim_cur = rlim.rlim_max = 0;
|
|
|
(void)setrlimit(RLIMIT_CORE, &rlim);
|
|
|
|
|
|
/* Turn off signals. */
|
|
|
(void)signal(SIGALRM, SIG_IGN);
|
|
|
(void)signal(SIGHUP, SIG_IGN);
|
|
|
(void)signal(SIGINT, SIG_IGN);
|
|
|
(void)signal(SIGPIPE, SIG_IGN);
|
|
|
(void)signal(SIGQUIT, SIG_IGN);
|
|
|
(void)signal(SIGTERM, SIG_IGN);
|
|
|
(void)signal(SIGCONT, pw_cont);
|
|
|
|
|
|
if (!pw_lck)
|
|
|
pw_lck = pw_file(_PATH_MASTERPASSWD_LOCK);
|
|
|
}
|
|
|
|
|
|
void
|
|
|
pw_edit(notsetuid, filename)
|
|
|
int notsetuid;
|
|
|
const char *filename;
|
|
|
{
|
|
|
int pstat;
|
|
|
char *p, *editor;
|
|
|
char *argp[] = {"sh", "-c", NULL, NULL};
|
|
|
|
|
|
if (!filename) {
|
|
|
filename = pw_lck;
|
|
|
if (!filename)
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
if (!(editor = getenv("EDITOR")))
|
|
|
editor = _PATH_VI;
|
|
|
|
|
|
p = malloc(strlen(editor) + 1 + strlen(filename) + 1);
|
|
|
if (p == NULL)
|
|
|
return;
|
|
|
sprintf(p, "%s %s", editor, filename);
|
|
|
argp[2] = p;
|
|
|
|
|
|
switch(editpid = vfork()) {
|
|
|
case -1: /* error */
|
|
|
free(p);
|
|
|
return;
|
|
|
case 0: /* child */
|
|
|
if (notsetuid) {
|
|
|
setgid(getgid());
|
|
|
setuid(getuid());
|
|
|
}
|
|
|
execv(_PATH_BSHELL, argp);
|
|
|
_exit(127);
|
|
|
}
|
|
|
|
|
|
free(p);
|
|
|
for (;;) {
|
|
|
editpid = waitpid(editpid, (int *)&pstat, WUNTRACED);
|
|
|
if (editpid == -1)
|
|
|
pw_error(editor, 1, 1);
|
|
|
else if (WIFSTOPPED(pstat))
|
|
|
raise(WSTOPSIG(pstat));
|
|
|
else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0)
|
|
|
break;
|
|
|
else
|
|
|
pw_error(editor, 1, 1);
|
|
|
}
|
|
|
editpid = -1;
|
|
|
}
|
|
|
|
|
|
void
|
|
|
pw_prompt()
|
|
|
{
|
|
|
int first, c;
|
|
|
|
|
|
(void)printf("re-edit the password file? [y]: ");
|
|
|
(void)fflush(stdout);
|
|
|
first = c = getchar();
|
|
|
while (c != '\n' && c != EOF)
|
|
|
c = getchar();
|
|
|
if (first == 'n')
|
|
|
pw_error(NULL, 0, 0);
|
|
|
}
|
|
|
|
|
|
void
|
|
|
pw_copy(ffd, tfd, pw)
|
|
|
int ffd, tfd;
|
|
|
struct passwd *pw;
|
|
|
{
|
|
|
FILE *from, *to;
|
|
|
int done;
|
|
|
char *p, buf[8192];
|
|
|
char *master = pw_file(_PATH_MASTERPASSWD);
|
|
|
|
|
|
if (!master)
|
|
|
pw_error(NULL, 0, 1);
|
|
|
if (!(from = fdopen(ffd, "r")))
|
|
|
pw_error(master, 1, 1);
|
|
|
if (!(to = fdopen(tfd, "w")))
|
|
|
pw_error(pw_lck ? pw_lck : NULL, pw_lck ? 1 : 0, 1);
|
|
|
|
|
|
for (done = 0; fgets(buf, sizeof(buf), from);) {
|
|
|
if (!strchr(buf, '\n')) {
|
|
|
warnx("%s: line too long", master);
|
|
|
pw_error(NULL, 0, 1);
|
|
|
}
|
|
|
if (done) {
|
|
|
(void)fprintf(to, "%s", buf);
|
|
|
if (ferror(to))
|
|
|
goto err;
|
|
|
continue;
|
|
|
}
|
|
|
if (!(p = strchr(buf, ':'))) {
|
|
|
warnx("%s: corrupted entry", master);
|
|
|
pw_error(NULL, 0, 1);
|
|
|
}
|
|
|
*p = '\0';
|
|
|
if (strcmp(buf, pw->pw_name)) {
|
|
|
*p = ':';
|
|
|
(void)fprintf(to, "%s", buf);
|
|
|
if (ferror(to))
|
|
|
goto err;
|
|
|
continue;
|
|
|
}
|
|
|
(void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
|
|
|
pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
|
|
|
pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos,
|
|
|
pw->pw_dir, pw->pw_shell);
|
|
|
done = 1;
|
|
|
if (ferror(to))
|
|
|
goto err;
|
|
|
}
|
|
|
if (!done)
|
|
|
(void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
|
|
|
pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
|
|
|
pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos,
|
|
|
pw->pw_dir, pw->pw_shell);
|
|
|
|
|
|
if (ferror(to))
|
|
|
err:
|
|
|
pw_error(NULL, 0, 1);
|
|
|
(void)fclose(to);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
pw_scan(bp, pw, flags)
|
|
|
char *bp;
|
|
|
struct passwd *pw;
|
|
|
int *flags;
|
|
|
{
|
|
|
u_long id;
|
|
|
int root;
|
|
|
char *p, *sh, *p2;
|
|
|
|
|
|
if (flags != (int *)NULL)
|
|
|
*flags = 0;
|
|
|
|
|
|
if (!(pw->pw_name = strsep(&bp, ":"))) /* login */
|
|
|
goto fmt;
|
|
|
root = !strcmp(pw->pw_name, "root");
|
|
|
|
|
|
if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */
|
|
|
goto fmt;
|
|
|
|
|
|
if (!(p = strsep(&bp, ":"))) /* uid */
|
|
|
goto fmt;
|
|
|
id = strtoul(p, &p2, 10);
|
|
|
if (root && id) {
|
|
|
warnx("root uid should be 0");
|
|
|
return (0);
|
|
|
}
|
|
|
if (*p2 != '\0') {
|
|
|
warnx("illegal uid field");
|
|
|
return (0);
|
|
|
}
|
|
|
if (id >= UINT_MAX) {
|
|
|
/* errno is set to ERANGE by strtoul(3) */
|
|
|
warnx("uid greater than %u", UINT_MAX-1);
|
|
|
return (0);
|
|
|
}
|
|
|
pw->pw_uid = (uid_t)id;
|
|
|
if ((*p == '\0') && (flags != (int *)NULL))
|
|
|
*flags |= _PASSWORD_NOUID;
|
|
|
|
|
|
if (!(p = strsep(&bp, ":"))) /* gid */
|
|
|
goto fmt;
|
|
|
id = strtoul(p, &p2, 10);
|
|
|
if (*p2 != '\0') {
|
|
|
warnx("illegal gid field");
|
|
|
return (0);
|
|
|
}
|
|
|
if (id > UINT_MAX) {
|
|
|
/* errno is set to ERANGE by strtoul(3) */
|
|
|
warnx("gid greater than %u", UINT_MAX-1);
|
|
|
return (0);
|
|
|
}
|
|
|
pw->pw_gid = (gid_t)id;
|
|
|
if ((*p == '\0') && (flags != (int *)NULL))
|
|
|
*flags |= _PASSWORD_NOGID;
|
|
|
|
|
|
pw->pw_class = strsep(&bp, ":"); /* class */
|
|
|
if (!(p = strsep(&bp, ":"))) /* change */
|
|
|
goto fmt;
|
|
|
pw->pw_change = atol(p);
|
|
|
if ((*p == '\0') && (flags != (int *)NULL))
|
|
|
*flags |= _PASSWORD_NOCHG;
|
|
|
if (!(p = strsep(&bp, ":"))) /* expire */
|
|
|
goto fmt;
|
|
|
pw->pw_expire = atol(p);
|
|
|
if ((*p == '\0') && (flags != (int *)NULL))
|
|
|
*flags |= _PASSWORD_NOEXP;
|
|
|
pw->pw_gecos = strsep(&bp, ":"); /* gecos */
|
|
|
pw->pw_dir = strsep(&bp, ":"); /* directory */
|
|
|
if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */
|
|
|
goto fmt;
|
|
|
|
|
|
p = pw->pw_shell;
|
|
|
if (root && *p) /* empty == /bin/sh */
|
|
|
for (setusershell();;) {
|
|
|
if (!(sh = getusershell())) {
|
|
|
warnx("warning, unknown root shell");
|
|
|
break;
|
|
|
}
|
|
|
if (!strcmp(p, sh))
|
|
|
break;
|
|
|
}
|
|
|
|
|
|
if (p = strsep(&bp, ":")) { /* too many */
|
|
|
fmt: warnx("corrupted entry");
|
|
|
return (0);
|
|
|
}
|
|
|
|
|
|
return (1);
|
|
|
}
|
|
|
|
|
|
void
|
|
|
pw_error(name, err, eval)
|
|
|
const char *name;
|
|
|
int err, eval;
|
|
|
{
|
|
|
char *master = pw_file(_PATH_MASTERPASSWD);
|
|
|
|
|
|
if (err)
|
|
|
warn(name);
|
|
|
if (master)
|
|
|
warnx("%s: unchanged", master);
|
|
|
pw_abort();
|
|
|
exit(eval);
|
|
|
}
|