busybox/loginutils/passwd.c

/* vi: set sw=4 ts=4: */
/*
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"
#include <syslog.h>

static void nuke_str(char *str)
{
	if (str) memset(str, 0, strlen(str));
}

static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
{
	char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
	char *orig = (char*)"";
	char *newp = NULL;
	char *cp = NULL;
	char *ret = NULL; /* failure so far */

	if (myuid && pw->pw_passwd[0]) {
		char *encrypted;

		orig = bb_askpass(0, "Old password:"); /* returns ptr to static */
		if (!orig)
			goto err_ret;
		encrypted = pw_encrypt(orig, pw->pw_passwd, 1); /* returns malloced str */
		if (strcmp(encrypted, pw->pw_passwd) != 0) {
			syslog(LOG_WARNING, "incorrect password for %s",
				pw->pw_name);
			bb_do_delay(FAIL_DELAY);
			puts("Incorrect password");
			goto err_ret;
		}
		if (ENABLE_FEATURE_CLEAN_UP) free(encrypted);
	}
	orig = xstrdup(orig); /* or else bb_askpass() will destroy it */
	newp = bb_askpass(0, "New password:"); /* returns ptr to static */
	if (!newp)
		goto err_ret;
	newp = xstrdup(newp); /* we are going to bb_askpass() again, so save it */
	if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
	 && obscure(orig, newp, pw) && myuid)
		goto err_ret; /* non-root is not allowed to have weak passwd */

	cp = bb_askpass(0, "Retype password:");
	if (!cp)
		goto err_ret;
	if (strcmp(cp, newp)) {
		puts("Passwords don't match");
		goto err_ret;
	}

	crypt_make_salt(salt, 1, 0); /* des */
	if (algo) { /* MD5 */
		strcpy(salt, "$1$");
		crypt_make_salt(salt + 3, 4, 0);
	}
	/* pw_encrypt returns malloced str */
	ret = pw_encrypt(newp, salt, 1);
	/* whee, success! */

 err_ret:
	nuke_str(orig);
	if (ENABLE_FEATURE_CLEAN_UP) free(orig);
	nuke_str(newp);
	if (ENABLE_FEATURE_CLEAN_UP) free(newp);
	nuke_str(cp);
	return ret;
}

int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int passwd_main(int argc UNUSED_PARAM, char **argv)
{
	enum {
		OPT_algo = 0x1, /* -a - password algorithm */
		OPT_lock = 0x2, /* -l - lock account */
		OPT_unlock = 0x4, /* -u - unlock account */
		OPT_delete = 0x8, /* -d - delete password */
		OPT_lud = 0xe,
		STATE_ALGO_md5 = 0x10,
		//STATE_ALGO_des = 0x20, not needed yet
	};
	unsigned opt;
	int rc;
	const char *opt_a = "";
	const char *filename;
	char *myname;
	char *name;
	char *newp;
	struct passwd *pw;
	uid_t myuid;
	struct rlimit rlimit_fsize;
	char c;
#if ENABLE_FEATURE_SHADOWPASSWDS
	/* Using _r function to avoid pulling in static buffers */
	struct spwd spw;
	char buffer[256];
#endif

	logmode = LOGMODE_BOTH;
	openlog(applet_name, LOG_NOWAIT, LOG_AUTH);
	opt = getopt32(argv, "a:lud", &opt_a);
	//argc -= optind;
	argv += optind;

	if (strcasecmp(opt_a, "des") != 0) /* -a */
		opt |= STATE_ALGO_md5;
	//else
	//	opt |= STATE_ALGO_des;
	myuid = getuid();
	/* -l, -u, -d require root priv and username argument */
	if ((opt & OPT_lud) && (myuid || !argv[0]))
		bb_show_usage();

	/* Will complain and die if username not found */
	myname = xstrdup(bb_getpwuid(NULL, -1, myuid));
	name = argv[0] ? argv[0] : myname;

	pw = getpwnam(name);
	if (!pw)
		bb_error_msg_and_die("unknown user %s", name);
	if (myuid && pw->pw_uid != myuid) {
		/* LOGMODE_BOTH */
		bb_error_msg_and_die("%s can't change password for %s", myname, name);
	}

#if ENABLE_FEATURE_SHADOWPASSWDS
	{
		/* getspnam_r may return 0 yet set result to NULL.
		 * At least glibc 2.4 does this. Be extra paranoid here. */
		struct spwd *result = NULL;
		if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result)
		 || !result || strcmp(result->sp_namp, pw->pw_name) != 0) {
			/* LOGMODE_BOTH */
			bb_error_msg("no record of %s in %s, using %s",
					name, bb_path_shadow_file,
					bb_path_passwd_file);
		} else {
			pw->pw_passwd = result->sp_pwdp;
		}
	}
#endif

	/* Decide what the new password will be */
	newp = NULL;
	c = pw->pw_passwd[0] - '!';
	if (!(opt & OPT_lud)) {
		if (myuid && !c) { /* passwd starts with '!' */
			/* LOGMODE_BOTH */
			bb_error_msg_and_die("cannot change "
					"locked password for %s", name);
		}
		printf("Changing password for %s\n", name);
		newp = new_password(pw, myuid, opt & STATE_ALGO_md5);
		if (!newp) {
			logmode = LOGMODE_STDIO;
			bb_error_msg_and_die("password for %s is unchanged", name);
		}
	} else if (opt & OPT_lock) {
		if (!c) goto skip; /* passwd starts with '!' */
		newp = xasprintf("!%s", pw->pw_passwd);
	} else if (opt & OPT_unlock) {
		if (c) goto skip; /* not '!' */
		/* pw->pw_passwd points to static storage,
		 * strdup'ing to avoid nasty surprizes */
		newp = xstrdup(&pw->pw_passwd[1]);
	} else if (opt & OPT_delete) {
		//newp = xstrdup("");
		newp = (char*)"";
	}

	rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
	setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
	bb_signals(0
		+ (1 << SIGHUP)
		+ (1 << SIGINT)
		+ (1 << SIGQUIT)
		, SIG_IGN);
	umask(077);
	xsetuid(0);

#if ENABLE_FEATURE_SHADOWPASSWDS
	filename = bb_path_shadow_file;
	rc = update_passwd(bb_path_shadow_file, name, newp);
	if (rc == 0) /* no lines updated, no errors detected */
#endif
	{
		filename = bb_path_passwd_file;
		rc = update_passwd(bb_path_passwd_file, name, newp);
	}
	/* LOGMODE_BOTH */
	if (rc < 0)
		bb_error_msg_and_die("cannot update password file %s",
				filename);
	bb_info_msg("Password for %s changed by %s", name, myname);

	//if (ENABLE_FEATURE_CLEAN_UP) free(newp);
 skip:
	if (!newp) {
		bb_error_msg_and_die("password for %s is already %slocked",
			name, (opt & OPT_unlock) ? "un" : "");
	}
	if (ENABLE_FEATURE_CLEAN_UP) free(myname);
	return 0;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
4	*/
5
6	#include "libbb.h"
7	#include <syslog.h>
8
9	static void nuke_str(char *str)
10	{
11	if (str) memset(str, 0, strlen(str));
12	}
13
14	static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
15	{
16	char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
17	char orig = (char)"";
18	char *newp = NULL;
19	char *cp = NULL;
20	char ret = NULL; / failure so far */
21
22	if (myuid && pw->pw_passwd[0]) {
23	char *encrypted;
24
25	orig = bb_askpass(0, "Old password:"); /* returns ptr to static */
26	if (!orig)
27	goto err_ret;
28	encrypted = pw_encrypt(orig, pw->pw_passwd, 1); /* returns malloced str */
29	if (strcmp(encrypted, pw->pw_passwd) != 0) {
30	syslog(LOG_WARNING, "incorrect password for %s",
31	pw->pw_name);
32	bb_do_delay(FAIL_DELAY);
33	puts("Incorrect password");
34	goto err_ret;
35	}
36	if (ENABLE_FEATURE_CLEAN_UP) free(encrypted);
37	}
38	orig = xstrdup(orig); /* or else bb_askpass() will destroy it */
39	newp = bb_askpass(0, "New password:"); /* returns ptr to static */
40	if (!newp)
41	goto err_ret;
42	newp = xstrdup(newp); /* we are going to bb_askpass() again, so save it */
43	if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
44	&& obscure(orig, newp, pw) && myuid)
45	goto err_ret; /* non-root is not allowed to have weak passwd */
46
47	cp = bb_askpass(0, "Retype password:");
48	if (!cp)
49	goto err_ret;
50	if (strcmp(cp, newp)) {
51	puts("Passwords don't match");
52	goto err_ret;
53	}
54
55	crypt_make_salt(salt, 1, 0); /* des */
56	if (algo) { /* MD5 */
57	strcpy(salt, "$1$");
58	crypt_make_salt(salt + 3, 4, 0);
59	}
60	/* pw_encrypt returns malloced str */
61	ret = pw_encrypt(newp, salt, 1);
62	/* whee, success! */
63
64	err_ret:
65	nuke_str(orig);
66	if (ENABLE_FEATURE_CLEAN_UP) free(orig);
67	nuke_str(newp);
68	if (ENABLE_FEATURE_CLEAN_UP) free(newp);
69	nuke_str(cp);
70	return ret;
71	}
72
73	int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
74	int passwd_main(int argc UNUSED_PARAM, char **argv)
75	{
76	enum {
77	OPT_algo = 0x1, /* -a - password algorithm */
78	OPT_lock = 0x2, /* -l - lock account */
79	OPT_unlock = 0x4, /* -u - unlock account */
80	OPT_delete = 0x8, /* -d - delete password */
81	OPT_lud = 0xe,
82	STATE_ALGO_md5 = 0x10,
83	//STATE_ALGO_des = 0x20, not needed yet
84	};
85	unsigned opt;
86	int rc;
87	const char *opt_a = "";
88	const char *filename;
89	char *myname;
90	char *name;
91	char *newp;
92	struct passwd *pw;
93	uid_t myuid;
94	struct rlimit rlimit_fsize;
95	char c;
96	#if ENABLE_FEATURE_SHADOWPASSWDS
97	/* Using _r function to avoid pulling in static buffers */
98	struct spwd spw;
99	char buffer[256];
100	#endif
101
102	logmode = LOGMODE_BOTH;
103	openlog(applet_name, LOG_NOWAIT, LOG_AUTH);
104	opt = getopt32(argv, "a:lud", &opt_a);
105	//argc -= optind;
106	argv += optind;
107
108	if (strcasecmp(opt_a, "des") != 0) /* -a */
109	opt \|= STATE_ALGO_md5;
110	//else
111	// opt \|= STATE_ALGO_des;
112	myuid = getuid();
113	/* -l, -u, -d require root priv and username argument */
114	if ((opt & OPT_lud) && (myuid \|\| !argv[0]))
115	bb_show_usage();
116
117	/* Will complain and die if username not found */
118	myname = xstrdup(bb_getpwuid(NULL, -1, myuid));
119	name = argv[0] ? argv[0] : myname;
120
121	pw = getpwnam(name);
122	if (!pw)
123	bb_error_msg_and_die("unknown user %s", name);
124	if (myuid && pw->pw_uid != myuid) {
125	/* LOGMODE_BOTH */
126	bb_error_msg_and_die("%s can't change password for %s", myname, name);
127	}
128
129	#if ENABLE_FEATURE_SHADOWPASSWDS
130	{
131	/* getspnam_r may return 0 yet set result to NULL.
132	* At least glibc 2.4 does this. Be extra paranoid here. */
133	struct spwd *result = NULL;
134	if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result)
135	\|\| !result \|\| strcmp(result->sp_namp, pw->pw_name) != 0) {
136	/* LOGMODE_BOTH */
137	bb_error_msg("no record of %s in %s, using %s",
138	name, bb_path_shadow_file,
139	bb_path_passwd_file);
140	} else {
141	pw->pw_passwd = result->sp_pwdp;
142	}
143	}
144	#endif
145
146	/* Decide what the new password will be */
147	newp = NULL;
148	c = pw->pw_passwd[0] - '!';
149	if (!(opt & OPT_lud)) {
150	if (myuid && !c) { /* passwd starts with '!' */
151	/* LOGMODE_BOTH */
152	bb_error_msg_and_die("cannot change "
153	"locked password for %s", name);
154	}
155	printf("Changing password for %s\n", name);
156	newp = new_password(pw, myuid, opt & STATE_ALGO_md5);
157	if (!newp) {
158	logmode = LOGMODE_STDIO;
159	bb_error_msg_and_die("password for %s is unchanged", name);
160	}
161	} else if (opt & OPT_lock) {
162	if (!c) goto skip; /* passwd starts with '!' */
163	newp = xasprintf("!%s", pw->pw_passwd);
164	} else if (opt & OPT_unlock) {
165	if (c) goto skip; /* not '!' */
166	/* pw->pw_passwd points to static storage,
167	* strdup'ing to avoid nasty surprizes */
168	newp = xstrdup(&pw->pw_passwd[1]);
169	} else if (opt & OPT_delete) {
170	//newp = xstrdup("");
171	newp = (char*)"";
172	}
173
174	rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
175	setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
176	bb_signals(0
177	+ (1 << SIGHUP)
178	+ (1 << SIGINT)
179	+ (1 << SIGQUIT)
180	, SIG_IGN);
181	umask(077);
182	xsetuid(0);
183
184	#if ENABLE_FEATURE_SHADOWPASSWDS
185	filename = bb_path_shadow_file;
186	rc = update_passwd(bb_path_shadow_file, name, newp);
187	if (rc == 0) /* no lines updated, no errors detected */
188	#endif
189	{
190	filename = bb_path_passwd_file;
191	rc = update_passwd(bb_path_passwd_file, name, newp);
192	}
193	/* LOGMODE_BOTH */
194	if (rc < 0)
195	bb_error_msg_and_die("cannot update password file %s",
196	filename);
197	bb_info_msg("Password for %s changed by %s", name, myname);
198
199	//if (ENABLE_FEATURE_CLEAN_UP) free(newp);
200	skip:
201	if (!newp) {
202	bb_error_msg_and_die("password for %s is already %slocked",
203	name, (opt & OPT_unlock) ? "un" : "");
204	}
205	if (ENABLE_FEATURE_CLEAN_UP) free(myname);
206	return 0;
207	}