loginutils/adduser.c - busybox - Git at Google

 /* 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>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  *
  */

 #include <errno.h>
 #include <fcntl.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
 #include <sys/param.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include "busybox.h"


 /* structs __________________________ */

 typedef struct {
 	uid_t u;
 	gid_t g;
 } Id;

 /* data _____________________________ */

 /* defaults : should this be in an external file? */
 static const char default_passwd[] = "x";
 static const char default_gecos[] = "Linux User,,,";
 static const char default_home_prefix[] = "/home";
 static const char default_shell[] = "/bin/sh";

 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
 /* shadow in use? */
 static int shadow_enabled = 0;
 #endif

 /* remix */
 /* EDR recoded such that the uid may be passed in *p */
 static int passwd_study(const char *filename, struct passwd *p)
 {
 	struct passwd *pw;
 	FILE *passwd;

 	const int min = 500;
 	const int max = 65000;

 	passwd = wfopen(filename, "r");
 	if (!passwd)
 		return 4;

 	/* EDR if uid is out of bounds, set to min */
 	if ((p->pw_uid > max) || (p->pw_uid < min))
 		p->pw_uid = min;

 	/* stuff to do:
 	 * make sure login isn't taken;
 	 * find free uid and gid;
 	 */
 	while ((pw = fgetpwent(passwd))) {
 		if (strcmp(pw->pw_name, p->pw_name) == 0) {
 			/* return 0; */
 			return 1;
 		}
 		if ((pw->pw_uid >= p->pw_uid) && (pw->pw_uid < max)
 			&& (pw->pw_uid >= min)) {
 			p->pw_uid = pw->pw_uid + 1;
 		}
 	}

 	/* EDR check for an already existing gid */
 	while (getgrgid(p->pw_uid) != NULL)
 		p->pw_uid++;

 	/* EDR also check for an existing group definition */
 	if (getgrnam(p->pw_name) != NULL)
 		return 3;

 	/* EDR bounds check */
 	if ((p->pw_uid > max) || (p->pw_uid < min))
 		return 2;

 	/* EDR create new gid always = uid */
 	p->pw_gid = p->pw_uid;

 	/* return 1; */
 	return 0;
 }

 static void addgroup_wrapper(const char *login, gid_t gid)
 {
 	char *cmd;

 	bb_asprintf(&cmd, "addgroup -g %d %s", gid, login);
 	system(cmd);
 	free(cmd);
 }

 static void passwd_wrapper(const char *login) __attribute__ ((noreturn));

 static void passwd_wrapper(const char *login)
 {
 	static const char prog[] = "passwd";
 	execlp(prog, prog, login, NULL);
 	error_msg_and_die("Failed to execute '%s', you must set the password for '%s' manually", prog, login);
 }

 /* putpwent(3) remix */
 static int adduser(const char *filename, struct passwd *p)
 {
 	FILE *passwd;
 	int r;
 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
 	FILE *shadow;
 	struct spwd *sp;
 #endif

 	/* make sure everything is kosher and setup uid && gid */
 	passwd = wfopen(filename, "a");
 	if (passwd == NULL) {
 		return 1;
 	}
 	fseek(passwd, 0, SEEK_END);

 	/* if (passwd_study(filename, p) == 0) { */
 	r = passwd_study(filename, p);
 	if (r) {
 		if (r == 1)
 			error_msg("%s: login already in use", p->pw_name);
 		else if (r == 2)
 			error_msg("illegal uid or no uids left");
 		else if (r == 3)
 			error_msg("group name %s already in use", p->pw_name);
 		else
 			error_msg("generic error.");
 		return 1;
 	}

 	/* add to passwd */
 	if (putpwent(p, passwd) == -1) {
 		return 1;
 	}
 	fclose(passwd);

 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
 	/* add to shadow if necessary */
 	if (shadow_enabled) {
 		shadow = wfopen(shadow_file, "a");
 		if (shadow == NULL) {
 			return 1;
 		}
 		fseek(shadow, 0, SEEK_END);
 		sp = pwd_to_spwd(p);
 		sp->sp_max = 99999;		/* debianish */
 		sp->sp_warn = 7;
 		fprintf(shadow, "%s:!:%ld:%ld:%ld:%ld:::\n",
 				sp->sp_namp, sp->sp_lstchg, sp->sp_min, sp->sp_max,
 				sp->sp_warn);
 		fclose(shadow);
 	}
 #endif

 	/* add to group */
 	/* addgroup should be responsible for dealing w/ gshadow */
 	addgroup_wrapper(p->pw_name, p->pw_gid);

 	/* Clear the umask for this process so it doesn't
 	 * * screw up the permissions on the mkdir and chown. */
 	umask(0);

 	/* mkdir */
 	if (mkdir(p->pw_dir, 0755)) {
 		perror_msg("%s", p->pw_dir);
 	}
 	/* Set the owner and group so it is owned by the new user. */
 	if (chown(p->pw_dir, p->pw_uid, p->pw_gid)) {
 		perror_msg("%s", p->pw_dir);
 	}
 	/* Now fix up the permissions to 2755. Can't do it before now
 	 * since chown will clear the setgid bit */
 	if (chmod(p->pw_dir, 02755)) {
 		perror_msg("%s", p->pw_dir);
 	}
 	/* interactively set passwd */
 	passwd_wrapper(p->pw_name);
 }


 /* return current uid (root is always uid == 0, right?) */
 static inline uid_t i_am_not_root(void)
 {
 	return geteuid();
 }

 /*
  * 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)
 {
 	int opt;
 	const char *login;
 	const char *gecos;
 	const char *home = NULL;
 	const char *shell;

 	struct passwd pw;

 	/* init */
 	if (argc < 2) {
 		show_usage();
 	}
 	gecos = default_gecos;
 	shell = default_shell;

 	/* get args */
 	while ((opt = getopt (argc, argv, "h:g:s:")) != -1)
 		switch (opt) {
 			case 'h':
 				home = optarg;
 				break;
 			case 'g':
 				gecos = optarg;
 				break;
 			case 's':
 				shell = optarg;
 				break;
 			default:
 				show_usage ();
 				break;
 		}

 	/* got root? */
 	if (i_am_not_root()) {
 		error_msg_and_die( "Only root may add a user or group to the system.");
 	}

 	/* get login */
 	if (optind >= argc) {
 		error_msg_and_die( "no user specified");
 	}
 	login = argv[optind];

 	/* create string for $HOME if not specified already */
 	if (!home) {
 		home = concat_path_file(default_home_prefix, login);
 	}
 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
 	/* is /etc/shadow in use? */
 	shadow_enabled = (0 == access(shadow_file, F_OK));
 #endif

 	/* create a passwd struct */
 	pw.pw_name = (char *)login;
 	pw.pw_passwd = (char *)default_passwd;
 	pw.pw_uid = 0;
 	pw.pw_gid = 0;
 	pw.pw_gecos = (char *)gecos;
 	pw.pw_dir = (char *)home;
 	pw.pw_shell = (char *)shell;

 	/* grand finale */
 	return adduser(passwd_file, &pw);
 }

 /* $Id: adduser.c,v 1.4 2002/09/16 06:22:24 andersen Exp $ */
	/* 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>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*/

	#include <errno.h>
	#include <fcntl.h>
	#include <stdarg.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <time.h>
	#include <unistd.h>
	#include <sys/param.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include "busybox.h"



	/* structs __________________________ */

	typedef struct {
	uid_t u;
	gid_t g;
	} Id;

	/* data _____________________________ */

	/* defaults : should this be in an external file? */
	static const char default_passwd[] = "x";
	static const char default_gecos[] = "Linux User,,,";
	static const char default_home_prefix[] = "/home";
	static const char default_shell[] = "/bin/sh";

	#ifdef CONFIG_FEATURE_SHADOWPASSWDS
	/* shadow in use? */
	static int shadow_enabled = 0;
	#endif

	/* remix */
	/* EDR recoded such that the uid may be passed in p /
	static int passwd_study(const char filename, struct passwd p)
	{
	struct passwd *pw;
	FILE *passwd;

	const int min = 500;
	const int max = 65000;

	passwd = wfopen(filename, "r");
	if (!passwd)
	return 4;

	/* EDR if uid is out of bounds, set to min */
	if ((p->pw_uid > max) \|\| (p->pw_uid < min))
	p->pw_uid = min;

	/* stuff to do:
	* make sure login isn't taken;
	* find free uid and gid;
	*/
	while ((pw = fgetpwent(passwd))) {
	if (strcmp(pw->pw_name, p->pw_name) == 0) {
	/* return 0; */
	return 1;
	}
	if ((pw->pw_uid >= p->pw_uid) && (pw->pw_uid < max)
	&& (pw->pw_uid >= min)) {
	p->pw_uid = pw->pw_uid + 1;
	}
	}

	/* EDR check for an already existing gid */
	while (getgrgid(p->pw_uid) != NULL)
	p->pw_uid++;

	/* EDR also check for an existing group definition */
	if (getgrnam(p->pw_name) != NULL)
	return 3;

	/* EDR bounds check */
	if ((p->pw_uid > max) \|\| (p->pw_uid < min))
	return 2;

	/* EDR create new gid always = uid */
	p->pw_gid = p->pw_uid;

	/* return 1; */
	return 0;
	}

	static void addgroup_wrapper(const char *login, gid_t gid)
	{
	char *cmd;

	bb_asprintf(&cmd, "addgroup -g %d %s", gid, login);
	system(cmd);
	free(cmd);
	}

	static void passwd_wrapper(const char *login) __attribute__ ((noreturn));

	static void passwd_wrapper(const char *login)
	{
	static const char prog[] = "passwd";
	execlp(prog, prog, login, NULL);
	error_msg_and_die("Failed to execute '%s', you must set the password for '%s' manually", prog, login);
	}

	/* putpwent(3) remix */
	static int adduser(const char filename, struct passwd p)
	{
	FILE *passwd;
	int r;
	#ifdef CONFIG_FEATURE_SHADOWPASSWDS
	FILE *shadow;
	struct spwd *sp;
	#endif

	/* make sure everything is kosher and setup uid && gid */
	passwd = wfopen(filename, "a");
	if (passwd == NULL) {
	return 1;
	}
	fseek(passwd, 0, SEEK_END);

	/* if (passwd_study(filename, p) == 0) { */
	r = passwd_study(filename, p);
	if (r) {
	if (r == 1)
	error_msg("%s: login already in use", p->pw_name);
	else if (r == 2)
	error_msg("illegal uid or no uids left");
	else if (r == 3)
	error_msg("group name %s already in use", p->pw_name);
	else
	error_msg("generic error.");
	return 1;
	}

	/* add to passwd */
	if (putpwent(p, passwd) == -1) {
	return 1;
	}
	fclose(passwd);

	#ifdef CONFIG_FEATURE_SHADOWPASSWDS
	/* add to shadow if necessary */
	if (shadow_enabled) {
	shadow = wfopen(shadow_file, "a");
	if (shadow == NULL) {
	return 1;
	}
	fseek(shadow, 0, SEEK_END);
	sp = pwd_to_spwd(p);
	sp->sp_max = 99999; /* debianish */
	sp->sp_warn = 7;
	fprintf(shadow, "%s:!:%ld:%ld:%ld:%ld:::\n",
	sp->sp_namp, sp->sp_lstchg, sp->sp_min, sp->sp_max,
	sp->sp_warn);
	fclose(shadow);
	}
	#endif

	/* add to group */
	/* addgroup should be responsible for dealing w/ gshadow */
	addgroup_wrapper(p->pw_name, p->pw_gid);

	/* Clear the umask for this process so it doesn't
	* * screw up the permissions on the mkdir and chown. */
	umask(0);

	/* mkdir */
	if (mkdir(p->pw_dir, 0755)) {
	perror_msg("%s", p->pw_dir);
	}
	/* Set the owner and group so it is owned by the new user. */
	if (chown(p->pw_dir, p->pw_uid, p->pw_gid)) {
	perror_msg("%s", p->pw_dir);
	}
	/* Now fix up the permissions to 2755. Can't do it before now
	* since chown will clear the setgid bit */
	if (chmod(p->pw_dir, 02755)) {
	perror_msg("%s", p->pw_dir);
	}
	/* interactively set passwd */
	passwd_wrapper(p->pw_name);
	}


	/* return current uid (root is always uid == 0, right?) */
	static inline uid_t i_am_not_root(void)
	{
	return geteuid();
	}

	/*
	* 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)
	{
	int opt;
	const char *login;
	const char *gecos;
	const char *home = NULL;
	const char *shell;

	struct passwd pw;

	/* init */
	if (argc < 2) {
	show_usage();
	}
	gecos = default_gecos;
	shell = default_shell;

	/* get args */
	while ((opt = getopt (argc, argv, "h:g:s:")) != -1)
	switch (opt) {
	case 'h':
	home = optarg;
	break;
	case 'g':
	gecos = optarg;
	break;
	case 's':
	shell = optarg;
	break;
	default:
	show_usage ();
	break;
	}

	/* got root? */
	if (i_am_not_root()) {
	error_msg_and_die( "Only root may add a user or group to the system.");
	}

	/* get login */
	if (optind >= argc) {
	error_msg_and_die( "no user specified");
	}
	login = argv[optind];

	/* create string for $HOME if not specified already */
	if (!home) {
	home = concat_path_file(default_home_prefix, login);
	}
	#ifdef CONFIG_FEATURE_SHADOWPASSWDS
	/* is /etc/shadow in use? */
	shadow_enabled = (0 == access(shadow_file, F_OK));
	#endif

	/* create a passwd struct */
	pw.pw_name = (char *)login;
	pw.pw_passwd = (char *)default_passwd;
	pw.pw_uid = 0;
	pw.pw_gid = 0;
	pw.pw_gecos = (char *)gecos;
	pw.pw_dir = (char *)home;
	pw.pw_shell = (char *)shell;

	/* grand finale */
	return adduser(passwd_file, &pw);
	}

	/* $Id: adduser.c,v 1.4 2002/09/16 06:22:24 andersen Exp $ */