busybox/loginutils/adduser.c

/* vi: set sw=4 ts=4: */
/*
 * adduser - add users to /etc/passwd and /etc/shadow
 *
 * Copyright (C) 1999 by Lineo, inc. and John Beppu
 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */
#include "libbb.h"

#if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
#error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
#endif

/* #define OPT_HOME           (1 << 0) */ /* unused */
/* #define OPT_GECOS          (1 << 1) */ /* unused */
#define OPT_SHELL          (1 << 2)
#define OPT_GID            (1 << 3)
#define OPT_DONT_SET_PASS  (1 << 4)
#define OPT_SYSTEM_ACCOUNT (1 << 5)
#define OPT_DONT_MAKE_HOME (1 << 6)
#define OPT_UID            (1 << 7)

/* We assume UID_T_MAX == INT_MAX */
/* remix */
/* recoded such that the uid may be passed in *p */
static void passwd_study(struct passwd *p)
{
	int max = UINT_MAX;

	if (getpwnam(p->pw_name)) {
		bb_error_msg_and_die("%s '%s' in use", "user", p->pw_name);
		/* this format string is reused in adduser and addgroup */
	}

	if (!(option_mask32 & OPT_UID)) {
		if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
			p->pw_uid = CONFIG_FIRST_SYSTEM_ID;
			max = CONFIG_LAST_SYSTEM_ID;
		} else {
			p->pw_uid = CONFIG_LAST_SYSTEM_ID + 1;
			max = 64999;
		}
	}
	/* check for a free uid (and maybe gid) */
	while (getpwuid(p->pw_uid) || (p->pw_gid == (gid_t)-1 && getgrgid(p->pw_uid))) {
		if (option_mask32 & OPT_UID) {
			/* -u N, cannot pick uid other than N: error */
			bb_error_msg_and_die("%s '%s' in use", "uid", itoa(p->pw_uid));
			/* this format string is reused in adduser and addgroup */
		}
		if (p->pw_uid == max) {
			bb_error_msg_and_die("no %cids left", 'u');
		}
		p->pw_uid++;
	}

	if (p->pw_gid == (gid_t)-1) {
		p->pw_gid = p->pw_uid; /* new gid = uid */
		if (getgrnam(p->pw_name)) {
			bb_error_msg_and_die("%s '%s' in use", "group", p->pw_name);
			/* this format string is reused in adduser and addgroup */
		}
	}
}

static void addgroup_wrapper(struct passwd *p, const char *group_name)
{
	char *cmd;

	if (group_name) /* Add user to existing group */
		cmd = xasprintf("addgroup '%s' '%s'", p->pw_name, group_name);
	else    /* Add user to his own group with the first free gid found in passwd_study */
		cmd = xasprintf("addgroup -g %u '%s'", (unsigned)p->pw_gid, p->pw_name);
	/* Warning: to be compatible with external addgroup programs we should use --gid instead */
	system(cmd);
	free(cmd);
}

static void passwd_wrapper(const char *login) NORETURN;

static void passwd_wrapper(const char *login)
{
	BB_EXECLP("passwd", "passwd", login, NULL);
	bb_error_msg_and_die("can't execute passwd, you must set password manually");
}

#if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
static const char adduser_longopts[] ALIGN1 =
		"home\0"                Required_argument "h"
		"gecos\0"               Required_argument "g"
		"shell\0"               Required_argument "s"
		"ingroup\0"             Required_argument "G"
		"disabled-password\0"   No_argument       "D"
		"empty-password\0"      No_argument       "D"
		"system\0"              No_argument       "S"
		"no-create-home\0"      No_argument       "H"
		"uid\0"                 Required_argument "u"
		;
#endif

/*
 * adduser will take a login_name as its first parameter.
 * home, shell, gecos:
 * can be customized via command-line parameters.
 */
int adduser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int adduser_main(int argc UNUSED_PARAM, char **argv)
{
	struct passwd pw;
	const char *usegroup = NULL;
	char *p;
	unsigned opts;

#if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
	applet_long_options = adduser_longopts;
#endif

	/* got root? */
	if (geteuid()) {
		bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
	}

	pw.pw_gecos = (char *)"Linux User,,,";
	pw.pw_shell = (char *)DEFAULT_SHELL;
	pw.pw_dir = NULL;

	/* exactly one non-option arg */
	/* disable interactive passwd for system accounts */
	opt_complementary = "=1:SD:u+";
	if (sizeof(pw.pw_uid) == sizeof(int)) {
		opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &pw.pw_uid);
	} else {
		unsigned uid;
		opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &uid);
		if (opts & OPT_UID) {
			pw.pw_uid = uid;
		}
	}
	argv += optind;

	/* fill in the passwd struct */
	pw.pw_name = argv[0];
	die_if_bad_username(pw.pw_name);
	if (!pw.pw_dir) {
		/* create string for $HOME if not specified already */
		pw.pw_dir = xasprintf("/home/%s", argv[0]);
	}
	pw.pw_passwd = (char *)"x";
	if (opts & OPT_SYSTEM_ACCOUNT) {
		if (!usegroup) {
			usegroup = "nogroup";
		}
		if (!(opts & OPT_SHELL)) {
			pw.pw_shell = (char *) "/bin/false";
		}
	}
	pw.pw_gid = usegroup ? xgroup2gid(usegroup) : -1; /* exits on failure */

	/* make sure everything is kosher and setup uid && maybe gid */
	passwd_study(&pw);

	p = xasprintf("x:%u:%u:%s:%s:%s",
			(unsigned) pw.pw_uid, (unsigned) pw.pw_gid,
			pw.pw_gecos, pw.pw_dir, pw.pw_shell);
	if (update_passwd(bb_path_passwd_file, pw.pw_name, p, NULL) < 0) {
		return EXIT_FAILURE;
	}
	if (ENABLE_FEATURE_CLEAN_UP)
		free(p);

#if ENABLE_FEATURE_SHADOWPASSWDS
	/* /etc/shadow fields:
	 * 1. username
	 * 2. encrypted password
	 * 3. last password change (unix date (unix time/24*60*60))
	 * 4. minimum days required between password changes
	 * 5. maximum days password is valid
	 * 6. days before password is to expire that user is warned
	 * 7. days after password expires that account is disabled
	 * 8. unix date when login expires (i.e. when it may no longer be used)
	 */
	/* fields:     2 3  4 5     6 78 */
	p = xasprintf("!:%u:0:99999:7:::", (unsigned)(time(NULL)) / (24*60*60));
	/* ignore errors: if file is missing we suppose admin doesn't want it */
	update_passwd(bb_path_shadow_file, pw.pw_name, p, NULL);
	if (ENABLE_FEATURE_CLEAN_UP)
		free(p);
#endif

	/* add to group */
	addgroup_wrapper(&pw, usegroup);

	/* clear the umask for this process so it doesn't
	 * screw up the permissions on the mkdir and chown. */
	umask(0);
	if (!(opts & OPT_DONT_MAKE_HOME)) {
		/* set the owner and group so it is owned by the new user,
		 * then fix up the permissions to 2755. Can't do it before
		 * since chown will clear the setgid bit */
		int mkdir_err = mkdir(pw.pw_dir, 0755);
		if (mkdir_err == 0) {
			/* New home. Copy /etc/skel to it */
			const char *args[] = {
				"chown", "-R",
				xasprintf("%u:%u", (int)pw.pw_uid, (int)pw.pw_gid),
				pw.pw_dir, NULL
			};
			/* Be silent on any errors (like: no /etc/skel) */
			logmode = LOGMODE_NONE;
			copy_file("/etc/skel", pw.pw_dir, FILEUTILS_RECUR);
			logmode = LOGMODE_STDIO;
			chown_main(4, (char**)args);
		}
		if ((mkdir_err != 0 && errno != EEXIST)
		 || chown(pw.pw_dir, pw.pw_uid, pw.pw_gid) != 0
		 || chmod(pw.pw_dir, 02755) != 0 /* set setgid bit on homedir */
		) {
			bb_simple_perror_msg(pw.pw_dir);
		}
	}

	if (!(opts & OPT_DONT_SET_PASS)) {
		/* interactively set passwd */
		passwd_wrapper(pw.pw_name);
	}

	return EXIT_SUCCESS;
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* adduser - add users to /etc/passwd and /etc/shadow
4			*
5			* Copyright (C) 1999 by Lineo, inc. and John Beppu
6			* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
7			*
8			* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
9			*/
10	niro	816	#include "libbb.h"
11	niro	532
12	niro	984	#if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
13			#error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
14			#endif
15
16			/* #define OPT_HOME (1 << 0) / / unused */
17			/* #define OPT_GECOS (1 << 1) / / unused */
18			#define OPT_SHELL (1 << 2)
19			#define OPT_GID (1 << 3)
20	niro	816	#define OPT_DONT_SET_PASS (1 << 4)
21			#define OPT_SYSTEM_ACCOUNT (1 << 5)
22			#define OPT_DONT_MAKE_HOME (1 << 6)
23	niro	984	#define OPT_UID (1 << 7)
24	niro	532
25	niro	984	/* We assume UID_T_MAX == INT_MAX */
26	niro	532	/* remix */
27	niro	816	/* recoded such that the uid may be passed in p /
28			static void passwd_study(struct passwd *p)
29	niro	532	{
30	niro	984	int max = UINT_MAX;
31	niro	532
32	niro	984	if (getpwnam(p->pw_name)) {
33			bb_error_msg_and_die("%s '%s' in use", "user", p->pw_name);
34			/* this format string is reused in adduser and addgroup */
35			}
36	niro	532
37	niro	984	if (!(option_mask32 & OPT_UID)) {
38			if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
39			p->pw_uid = CONFIG_FIRST_SYSTEM_ID;
40			max = CONFIG_LAST_SYSTEM_ID;
41			} else {
42			p->pw_uid = CONFIG_LAST_SYSTEM_ID + 1;
43			max = 64999;
44			}
45	niro	532	}
46	niro	816	/* check for a free uid (and maybe gid) */
47	niro	984	while (getpwuid(p->pw_uid) \|\| (p->pw_gid == (gid_t)-1 && getgrgid(p->pw_uid))) {
48			if (option_mask32 & OPT_UID) {
49			/* -u N, cannot pick uid other than N: error */
50			bb_error_msg_and_die("%s '%s' in use", "uid", itoa(p->pw_uid));
51			/* this format string is reused in adduser and addgroup */
52			}
53			if (p->pw_uid == max) {
54			bb_error_msg_and_die("no %cids left", 'u');
55			}
56	niro	816	p->pw_uid++;
57	niro	984	}
58	niro	532
59	niro	984	if (p->pw_gid == (gid_t)-1) {
60			p->pw_gid = p->pw_uid; /* new gid = uid */
61			if (getgrnam(p->pw_name)) {
62			bb_error_msg_and_die("%s '%s' in use", "group", p->pw_name);
63			/* this format string is reused in adduser and addgroup */
64			}
65	niro	532	}
66			}
67
68	niro	984	static void addgroup_wrapper(struct passwd p, const char group_name)
69	niro	532	{
70			char *cmd;
71
72	niro	984	if (group_name) /* Add user to existing group */
73			cmd = xasprintf("addgroup '%s' '%s'", p->pw_name, group_name);
74			else /* Add user to his own group with the first free gid found in passwd_study */
75			cmd = xasprintf("addgroup -g %u '%s'", (unsigned)p->pw_gid, p->pw_name);
76			/* Warning: to be compatible with external addgroup programs we should use --gid instead */
77	niro	532	system(cmd);
78			free(cmd);
79			}
80
81	niro	816	static void passwd_wrapper(const char *login) NORETURN;
82	niro	532
83			static void passwd_wrapper(const char *login)
84			{
85	niro	984	BB_EXECLP("passwd", "passwd", login, NULL);
86			bb_error_msg_and_die("can't execute passwd, you must set password manually");
87	niro	532	}
88
89	niro	816	#if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
90			static const char adduser_longopts[] ALIGN1 =
91			"home\0" Required_argument "h"
92			"gecos\0" Required_argument "g"
93			"shell\0" Required_argument "s"
94			"ingroup\0" Required_argument "G"
95			"disabled-password\0" No_argument "D"
96			"empty-password\0" No_argument "D"
97			"system\0" No_argument "S"
98			"no-create-home\0" No_argument "H"
99	niro	984	"uid\0" Required_argument "u"
100	niro	816	;
101			#endif
102
103			/*
104			* adduser will take a login_name as its first parameter.
105			* home, shell, gecos:
106			* can be customized via command-line parameters.
107			*/
108			int adduser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
109			int adduser_main(int argc UNUSED_PARAM, char **argv)
110	niro	532	{
111	niro	816	struct passwd pw;
112			const char *usegroup = NULL;
113	niro	984	char *p;
114			unsigned opts;
115	niro	532
116	niro	816	#if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
117			applet_long_options = adduser_longopts;
118			#endif
119	niro	532
120	niro	816	/* got root? */
121			if (geteuid()) {
122			bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
123			}
124	niro	532
125	niro	816	pw.pw_gecos = (char *)"Linux User,,,";
126			pw.pw_shell = (char *)DEFAULT_SHELL;
127			pw.pw_dir = NULL;
128
129			/* exactly one non-option arg */
130	niro	984	/* disable interactive passwd for system accounts */
131			opt_complementary = "=1:SD:u+";
132			if (sizeof(pw.pw_uid) == sizeof(int)) {
133			opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &pw.pw_uid);
134			} else {
135			unsigned uid;
136			opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &uid);
137			if (opts & OPT_UID) {
138			pw.pw_uid = uid;
139			}
140			}
141	niro	816	argv += optind;
142
143			/* fill in the passwd struct */
144			pw.pw_name = argv[0];
145			die_if_bad_username(pw.pw_name);
146			if (!pw.pw_dir) {
147			/* create string for $HOME if not specified already */
148			pw.pw_dir = xasprintf("/home/%s", argv[0]);
149			}
150			pw.pw_passwd = (char *)"x";
151	niro	984	if (opts & OPT_SYSTEM_ACCOUNT) {
152			if (!usegroup) {
153			usegroup = "nogroup";
154			}
155			if (!(opts & OPT_SHELL)) {
156			pw.pw_shell = (char *) "/bin/false";
157			}
158			}
159			pw.pw_gid = usegroup ? xgroup2gid(usegroup) : -1; /* exits on failure */
160	niro	816
161			/* make sure everything is kosher and setup uid && maybe gid */
162			passwd_study(&pw);
163
164	niro	984	p = xasprintf("x:%u:%u:%s:%s:%s",
165			(unsigned) pw.pw_uid, (unsigned) pw.pw_gid,
166			pw.pw_gecos, pw.pw_dir, pw.pw_shell);
167			if (update_passwd(bb_path_passwd_file, pw.pw_name, p, NULL) < 0) {
168			return EXIT_FAILURE;
169	niro	532	}
170	niro	984	if (ENABLE_FEATURE_CLEAN_UP)
171			free(p);
172	niro	532
173			#if ENABLE_FEATURE_SHADOWPASSWDS
174	niro	984	/* /etc/shadow fields:
175			* 1. username
176			* 2. encrypted password
177			* 3. last password change (unix date (unix time/246060))
178			* 4. minimum days required between password changes
179			* 5. maximum days password is valid
180			* 6. days before password is to expire that user is warned
181			* 7. days after password expires that account is disabled
182			* 8. unix date when login expires (i.e. when it may no longer be used)
183			*/
184			/* fields: 2 3 4 5 6 78 */
185			p = xasprintf("!:%u:0:99999:7:::", (unsigned)(time(NULL)) / (246060));
186			/* ignore errors: if file is missing we suppose admin doesn't want it */
187			update_passwd(bb_path_shadow_file, pw.pw_name, p, NULL);
188			if (ENABLE_FEATURE_CLEAN_UP)
189			free(p);
190	niro	532	#endif
191
192			/* add to group */
193	niro	984	addgroup_wrapper(&pw, usegroup);
194	niro	532
195	niro	984	/* clear the umask for this process so it doesn't
196	niro	816	* screw up the permissions on the mkdir and chown. */
197	niro	532	umask(0);
198	niro	984	if (!(opts & OPT_DONT_MAKE_HOME)) {
199			/* set the owner and group so it is owned by the new user,
200			* then fix up the permissions to 2755. Can't do it before
201			* since chown will clear the setgid bit */
202	niro	1123	int mkdir_err = mkdir(pw.pw_dir, 0755);
203			if (mkdir_err == 0) {
204			/* New home. Copy /etc/skel to it */
205			const char *args[] = {
206			"chown", "-R",
207			xasprintf("%u:%u", (int)pw.pw_uid, (int)pw.pw_gid),
208			pw.pw_dir, NULL
209			};
210			/* Be silent on any errors (like: no /etc/skel) */
211			logmode = LOGMODE_NONE;
212			copy_file("/etc/skel", pw.pw_dir, FILEUTILS_RECUR);
213			logmode = LOGMODE_STDIO;
214			chown_main(4, (char**)args);
215			}
216			if ((mkdir_err != 0 && errno != EEXIST)
217	niro	984	\|\| chown(pw.pw_dir, pw.pw_uid, pw.pw_gid) != 0
218			\|\| chmod(pw.pw_dir, 02755) != 0 /* set setgid bit on homedir */
219	niro	816	) {
220			bb_simple_perror_msg(pw.pw_dir);
221	niro	532	}
222			}
223
224	niro	984	if (!(opts & OPT_DONT_SET_PASS)) {
225	niro	532	/* interactively set passwd */
226	niro	816	passwd_wrapper(pw.pw_name);
227	niro	532	}
228
229	niro	1123	return EXIT_SUCCESS;
230	niro	532	}