busybox/loginutils/chpasswd.c

/* vi: set sw=4 ts=4: */
/*
 * chpasswd.c
 *
 * Written for SLIND (from passwd.c) by Alexander Shishkin <virtuoso@slind.org>
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"

#if ENABLE_GETOPT_LONG
static const char chpasswd_longopts[] ALIGN1 =
	"encrypted\0" No_argument "e"
	"md5\0"       No_argument "m"
	;
#endif

#define OPT_ENC		1
#define OPT_MD5		2

int chpasswd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int chpasswd_main(int argc UNUSED_PARAM, char **argv)
{
	char *name, *pass;
	char salt[sizeof("$N$XXXXXXXX")];
	int opt, rc;
	int rnd = rnd; /* we *want* it to be non-initialized! */

	if (getuid())
		bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);

	opt_complementary = "m--e:e--m";
	USE_GETOPT_LONG(applet_long_options = chpasswd_longopts;)
	opt = getopt32(argv, "em");

	while ((name = xmalloc_fgetline(stdin)) != NULL) {
		pass = strchr(name, ':');
		if (!pass)
			bb_error_msg_and_die("missing new password");
		*pass++ = '\0';

		xuname2uid(name); /* dies if there is no such user */

		if (!(opt & OPT_ENC)) {
			rnd = crypt_make_salt(salt, 1, rnd);
			if (opt & OPT_MD5) {
				strcpy(salt, "$1$");
				rnd = crypt_make_salt(salt + 3, 4, rnd);
			}
			pass = pw_encrypt(pass, salt, 0);
		}

		/* This is rather complex: if user is not found in /etc/shadow,
		 * we try to find & change his passwd in /etc/passwd */
#if ENABLE_FEATURE_SHADOWPASSWDS
		rc = update_passwd(bb_path_shadow_file, name, pass);
		if (rc == 0) /* no lines updated, no errors detected */
#endif
			rc = update_passwd(bb_path_passwd_file, name, pass);
		/* LOGMODE_BOTH logs to syslog also */
		logmode = LOGMODE_BOTH;
		if (rc < 0)
			bb_error_msg_and_die("an error occurred updating password for %s", name);
		if (rc)
			bb_info_msg("Password for '%s' changed", name);
		logmode = LOGMODE_STDIO;
		free(name);
		if (!(opt & OPT_ENC))
			free(pass);
	}
	return EXIT_SUCCESS;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* chpasswd.c
4	*
5	* Written for SLIND (from passwd.c) by Alexander Shishkin <virtuoso@slind.org>
6	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
7	*/
8
9	#include "libbb.h"
10
11	#if ENABLE_GETOPT_LONG
12	static const char chpasswd_longopts[] ALIGN1 =
13	"encrypted\0" No_argument "e"
14	"md5\0" No_argument "m"
15	;
16	#endif
17
18	#define OPT_ENC 1
19	#define OPT_MD5 2
20
21	int chpasswd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
22	int chpasswd_main(int argc UNUSED_PARAM, char **argv)
23	{
24	char name, pass;
25	char salt[sizeof("$N$XXXXXXXX")];
26	int opt, rc;
27	int rnd = rnd; /* we want it to be non-initialized! */
28
29	if (getuid())
30	bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
31
32	opt_complementary = "m--e:e--m";
33	USE_GETOPT_LONG(applet_long_options = chpasswd_longopts;)
34	opt = getopt32(argv, "em");
35
36	while ((name = xmalloc_fgetline(stdin)) != NULL) {
37	pass = strchr(name, ':');
38	if (!pass)
39	bb_error_msg_and_die("missing new password");
40	*pass++ = '\0';
41
42	xuname2uid(name); /* dies if there is no such user */
43
44	if (!(opt & OPT_ENC)) {
45	rnd = crypt_make_salt(salt, 1, rnd);
46	if (opt & OPT_MD5) {
47	strcpy(salt, "$1$");
48	rnd = crypt_make_salt(salt + 3, 4, rnd);
49	}
50	pass = pw_encrypt(pass, salt, 0);
51	}
52
53	/* This is rather complex: if user is not found in /etc/shadow,
54	* we try to find & change his passwd in /etc/passwd */
55	#if ENABLE_FEATURE_SHADOWPASSWDS
56	rc = update_passwd(bb_path_shadow_file, name, pass);
57	if (rc == 0) /* no lines updated, no errors detected */
58	#endif
59	rc = update_passwd(bb_path_passwd_file, name, pass);
60	/* LOGMODE_BOTH logs to syslog also */
61	logmode = LOGMODE_BOTH;
62	if (rc < 0)
63	bb_error_msg_and_die("an error occurred updating password for %s", name);
64	if (rc)
65	bb_info_msg("Password for '%s' changed", name);
66	logmode = LOGMODE_STDIO;
67	free(name);
68	if (!(opt & OPT_ENC))
69	free(pass);
70	}
71	return EXIT_SUCCESS;
72	}