X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=loginutils%2Fadduser.c;h=608fb8437ae989b646fb9b3cd17bd18d2b4d82ac;hb=9529115c4ce87d4faecd1c55e547162efe74d629;hp=8101b20b4febfddad64653cda792e6a1433e701b;hpb=67b23e6043d8e2b30b0bf3bc105b8583c2a26db5;p=oweals%2Fbusybox.git

diff --git a/loginutils/adduser.c b/loginutils/adduser.c
index 8101b20b4..608fb8437 100644
--- a/loginutils/adduser.c
+++ b/loginutils/adduser.c
@@ -5,190 +5,324 @@
  * 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.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
+//config:config ADDUSER
+//config:	bool "adduser"
+//config:	default y
+//config:	help
+//config:	  Utility for creating a new user account.
+//config:
+//config:config FEATURE_ADDUSER_LONG_OPTIONS
+//config:	bool "Enable long options"
+//config:	default y
+//config:	depends on ADDUSER && LONG_OPTS
+//config:	help
+//config:	  Support long options for the adduser applet.
+//config:
+//config:config FEATURE_CHECK_NAMES
+//config:	bool "Enable sanity check on user/group names in adduser and addgroup"
+//config:	default n
+//config:	depends on ADDUSER || ADDGROUP
+//config:	help
+//config:	  Enable sanity check on user and group names in adduser and addgroup.
+//config:	  To avoid problems, the user or group name should consist only of
+//config:	  letters, digits, underscores, periods, at signs and dashes,
+//config:	  and not start with a dash (as defined by IEEE Std 1003.1-2001).
+//config:	  For compatibility with Samba machine accounts "$" is also supported
+//config:	  at the end of the user or group name.
+//config:
+//config:config LAST_ID
+//config:	int "Last valid uid or gid for adduser and addgroup"
+//config:	depends on ADDUSER || ADDGROUP
+//config:	default 60000
+//config:	help
+//config:	  Last valid uid or gid for adduser and addgroup
+//config:
+//config:config FIRST_SYSTEM_ID
+//config:	int "First valid system uid or gid for adduser and addgroup"
+//config:	depends on ADDUSER || ADDGROUP
+//config:	range 0 LAST_ID
+//config:	default 100
+//config:	help
+//config:	  First valid system uid or gid for adduser and addgroup
+//config:
+//config:config LAST_SYSTEM_ID
+//config:	int "Last valid system uid or gid for adduser and addgroup"
+//config:	depends on ADDUSER || ADDGROUP
+//config:	range FIRST_SYSTEM_ID LAST_ID
+//config:	default 999
+//config:	help
+//config:	  Last valid system uid or gid for adduser and addgroup
+
+//applet:IF_ADDUSER(APPLET(adduser, BB_DIR_USR_SBIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_ADDUSER) += adduser.o
+
+//usage:#define adduser_trivial_usage
+//usage:       "[OPTIONS] USER [GROUP]"
+//usage:#define adduser_full_usage "\n\n"
+//usage:       "Create new user, or add USER to GROUP\n"
+//usage:     "\n	-h DIR		Home directory"
+//usage:     "\n	-g GECOS	GECOS field"
+//usage:     "\n	-s SHELL	Login shell"
+//usage:     "\n	-G GRP		Add user to existing group"
+//usage:     "\n	-S		Create a system user"
+//usage:     "\n	-D		Don't assign a password"
+//usage:     "\n	-H		Don't create home directory"
+//usage:     "\n	-u UID		User id"
+//usage:     "\n	-k SKEL		Skeleton directory (/etc/skel)"
+
+#include "libbb.h"
+
+#if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
+#error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
+#endif
+#if CONFIG_LAST_ID < CONFIG_LAST_SYSTEM_ID
+#error Bad LAST_ID or LAST_SYSTEM_ID in .config
+#endif
 
-#include "busybox.h"
-
-#define DONT_SET_PASS			(1 << 4)
-#define DONT_MAKE_HOME			(1 << 6)
 
+/* #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)
+#define OPT_SKEL           (1 << 8)
 
 /* remix */
-/* EDR recoded such that the uid may be passed in *p */
-static int passwd_study(const char *filename, struct passwd *p)
+/* recoded such that the uid may be passed in *p */
+static void passwd_study(struct passwd *p)
 {
-	struct passwd *pw;
-	FILE *passwd;
-
-	const int min = 500;
-	const int max = 65000;
+	int max = CONFIG_LAST_ID;
 
-	passwd = xfopen(filename, "r");
-
-	/* EDR if uid is out of bounds, set to min */
-	if ((p->pw_uid > max) || (p->pw_uid < min))
-		p->pw_uid = min;
+	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 */
+	}
 
-	/* 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 (!(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;
 		}
-		if ((pw->pw_uid >= p->pw_uid) && (pw->pw_uid < max)
-			&& (pw->pw_uid >= min)) {
-			p->pw_uid = pw->pw_uid + 1;
+	}
+	/* 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');
+			/* this format string is reused in adduser and addgroup */
+		}
+		p->pw_uid++;
 	}
 
-	if (p->pw_gid == 0) {
-		/* 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 create new gid always = uid */
-		p->pw_gid = 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 */
+		}
 	}
-
-	/* EDR bounds check */
-	if ((p->pw_uid > max) || (p->pw_uid < min))
-		return 2;
-
-	/* return 1; */
-	return 0;
 }
 
-static void addgroup_wrapper(struct passwd *p)
+static int addgroup_wrapper(struct passwd *p, const char *group_name)
 {
-	char *cmd;
+	char *argv[6];
+
+	argv[0] = (char*)"addgroup";
+	if (group_name) {
+		/* Add user to existing group */
+		argv[1] = (char*)"--";
+		argv[2] = p->pw_name;
+		argv[3] = (char*)group_name;
+		argv[4] = NULL;
+	} else {
+		/* Add user to his own group with the first free gid
+		 * found in passwd_study.
+		 */
+#if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS || !ENABLE_ADDGROUP
+		/* We try to use --gid, not -g, because "standard" addgroup
+		 * has no short option -g, it has only long --gid.
+		 */
+		argv[1] = (char*)"--gid";
+#else
+		/* Breaks if system in fact does NOT use busybox addgroup */
+		argv[1] = (char*)"-g";
+#endif
+		argv[2] = utoa(p->pw_gid);
+		argv[3] = (char*)"--";
+		argv[4] = p->pw_name;
+		argv[5] = NULL;
+	}
 
-	cmd = xasprintf("addgroup -g %d \"%s\"", p->pw_gid, p->pw_name);
-	system(cmd);
-	free(cmd);
+	return spawn_and_wait(argv);
 }
 
-static void passwd_wrapper(const char *login) ATTRIBUTE_NORETURN;
+static void passwd_wrapper(const char *login_name) NORETURN;
 
-static void passwd_wrapper(const char *login)
+static void passwd_wrapper(const char *login_name)
 {
-	static const char prog[] = "passwd";
-	execlp(prog, prog, login, NULL);
-	bb_error_msg_and_die("Failed to execute '%s', you must set the password for '%s' manually", prog, login);
+	BB_EXECLP("passwd", "passwd", "--", login_name, NULL);
+	bb_error_msg_and_die("can't execute passwd, you must set password manually");
 }
 
-/* putpwent(3) remix */
-static int adduser(struct passwd *p, unsigned long flags)
-{
-	FILE *file;
-	int addgroup = !p->pw_gid;
-
-	/* make sure everything is kosher and setup uid && gid */
-	file = xfopen(bb_path_passwd_file, "a");
-	fseek(file, 0, SEEK_END);
-
-	switch (passwd_study(bb_path_passwd_file, p)) {
-		case 1:
-			bb_error_msg_and_die("%s: login already in use", p->pw_name);
-		case 2:
-			bb_error_msg_and_die("illegal uid or no uids left");
-		case 3:
-			bb_error_msg_and_die("%s: group name already in use", p->pw_name);
- 	}
-
-	/* add to passwd */
-	if (putpwent(p, file) == -1) {
-		bb_perror_nomsg_and_die();
-	}
-	fclose(file);
-
-#if ENABLE_FEATURE_SHADOWPASSWDS
-	/* add to shadow if necessary */
-	file = xfopen(bb_path_shadow_file, "a");
-	fseek(file, 0, SEEK_END);
-	fprintf(file, "%s:!:%ld:%d:%d:%d:::\n",
-					p->pw_name,				/* username */
-					time(NULL) / 86400,		/* sp->sp_lstchg */ 
-					0,						/* sp->sp_min */
-					99999,					/* sp->sp_max */
-					7);						/* sp->sp_warn */
-	fclose(file);
+#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"
+		"skel\0"                Required_argument "k"
+		;
 #endif
 
-	/* add to group */
-	/* addgroup should be responsible for dealing w/ gshadow */
-	/* if using a pre-existing group, don't create one */
-	if (addgroup) addgroup_wrapper(p);
-
-	/* Clear the umask for this process so it doesn't
-	 * * screw up the permissions on the mkdir and chown. */
-	umask(0);
-	if (!(flags & 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 */
-		if (mkdir(p->pw_dir, 0755)
-		|| chown(p->pw_dir, p->pw_uid, p->pw_gid)
-		|| chmod(p->pw_dir, 02755)) {
-			bb_perror_msg("%s", p->pw_dir);
-		}
-	}
-
-	if (!(flags & DONT_SET_PASS)) {
-		/* interactively set passwd */
-		passwd_wrapper(p->pw_name);
-	}
-
-	return 0;
-}
-
 /*
  * adduser will take a login_name as its first parameter.
- *
- * home
- * shell
- * gecos
- *
+ * home, shell, gecos:
  * can be customized via command-line parameters.
- * ________________________________________________________________________ */
-int adduser_main(int argc, char **argv)
+ */
+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;
-	unsigned long flags;
+	char *p;
+	unsigned opts;
+	char *uid;
+	const char *skel = "/etc/skel";
 
-	pw.pw_gecos = "Linux User,,,";
-	pw.pw_shell = (char *)DEFAULT_SHELL;
-	pw.pw_dir = NULL;
-
-	/* check for min, max and missing args and exit on error */
-	opt_complementary = "-1:?1:?";
-	flags = getopt32(argc, argv, "h:g:s:G:DSH", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup);
+#if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
+	applet_long_options = adduser_longopts;
+#endif
 
 	/* got root? */
-	if(geteuid()) {
+	if (geteuid()) {
 		bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
 	}
 
-	/* create string for $HOME if not specified already */
+	pw.pw_gecos = (char *)"Linux User,,,";
+	/* We assume that newly created users "inherit" root's shell setting */
+	pw.pw_shell = (char *)get_shell_name();
+	pw.pw_dir = NULL;
+
+	/* at least one and at most two non-option args */
+	/* disable interactive passwd for system accounts */
+	opt_complementary = "-1:?2:SD";
+	opts = getopt32(argv, "h:g:s:G:DSHu:k:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &uid, &skel);
+	if (opts & OPT_UID)
+		pw.pw_uid = xatou_range(uid, 0, CONFIG_LAST_ID);
+
+	argv += optind;
+	pw.pw_name = argv[0];
+
+	if (!opts && argv[1]) {
+		/* if called with two non-option arguments, adduser
+		 * will add an existing user to an existing group.
+		 */
+		return addgroup_wrapper(&pw, argv[1]);
+	}
+
+	/* fill in the passwd struct */
+	die_if_bad_username(pw.pw_name);
 	if (!pw.pw_dir) {
-		snprintf(bb_common_bufsiz1, BUFSIZ, "/home/%s", argv[optind]);
-		pw.pw_dir =  &bb_common_bufsiz1[0];
+		/* 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);
 
-	/* create a passwd struct */
-	pw.pw_name = argv[optind];
-	pw.pw_passwd = "x";
-	pw.pw_uid = 0;
-	pw.pw_gid = (usegroup) ? bb_xgetgrnam(usegroup) : 0; /* exits on failure */
+	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) */
+			if (!(opts & OPT_SKEL))
+				logmode = LOGMODE_NONE;
+			copy_file(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);
+	}
 
-	/* grand finale */
-	return adduser(&pw, flags);
+	return EXIT_SUCCESS;
 }