Bigger patch for (partial) tinylogin integration

- Made a new dir loginutils
- Moved all applets from pwd_grp to loginutils
- Added new applets su.c login.c to loginutils
- Made a new dir libpwdgrp
- Moved everything from pwd_grp/libpwd_grp there
- Added shadow.c to libpwdgrp
- Removed dir pwd_grp
- Added usage strings for login and su to usage.h
- Changed main Makefile to reflect the dir rearrangements
[Parts of this patch may overlap with my other two patches]

1 files changed, 352 insertions, 0 deletions

diff --git a/loginutils/adduser.c b/loginutils/adduser.c
new file mode 100644
index 000000000..66fcaa23f
--- /dev/null
+++ b/loginutils/adduser.c
@@ -0,0 +1,352 @@
+/* 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"
+#include "pwd.h"
+#include "grp.h"
+
+#define PASSWD_FILE     "/etc/passwd"
+#define SHADOW_FILE		"/etc/shadow"
+
+
+/* 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
+
+#include "shadow.h"
+
+/* 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)
+{
+	int argc = 3;
+	const char *argv0_save;
+	char group_id[8];
+	char group_name[32];
+	char *argv[] = { group_name, "-g", group_id };
+
+	argv0_save = applet_name;
+	applet_name = "addgroup";
+	safe_strncpy(group_name, login, 32);
+	sprintf(group_id, "%d", gid);
+	addgroup_main(argc, argv);
+	applet_name = argv0_save;
+}
+
+static void passwd_wrapper(const char *login)
+{
+	static const char prog[] = "passwd";
+	execlp(prog, prog, login, NULL);
+	error_msg_and_die("Failed to execute 'passwd', you must set the password for '%s' manually", login);
+}
+
+#ifdef CONFIG_FEATURE_SHADOWPASSWDS
+/*
+ * pwd_to_spwd - create entries for new spwd structure
+ *
+ *	pwd_to_spwd() creates a new (struct spwd) containing the
+ *	information in the pointed-to (struct passwd).
+ */
+#define DAY (24L*3600L)
+#define WEEK (7*DAY)
+#define SCALE DAY
+static struct spwd *pwd_to_spwd(const struct passwd *pw)
+{
+	static struct spwd sp;
+
+	/*
+	 * Nice, easy parts first.  The name and passwd map directly
+	 * from the old password structure to the new one.
+	 */
+	sp.sp_namp = pw->pw_name;
+	sp.sp_pwdp = pw->pw_passwd;
+
+	/*
+	 * Defaults used if there is no pw_age information.
+	 */
+	sp.sp_min = 0;
+	sp.sp_max = (10000L * DAY) / SCALE;
+	sp.sp_lstchg = time((time_t *) 0) / SCALE;
+
+	/*
+	 * These fields have no corresponding information in the password
+	 * file.  They are set to uninitialized values.
+	 */
+	sp.sp_warn = -1;
+	sp.sp_expire = -1;
+	sp.sp_inact = -1;
+	sp.sp_flag = -1;
+
+	return &sp;
+}
+#endif
+
+/* 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; */
+		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; */
+		return 1;
+	}
+
+	/* add to passwd */
+	if (putpwent(p, passwd) == -1) {
+		/* return -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; */
+			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 0;
+}
+
+
+/* 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 i = 0;
+	char 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 = argv[++i];
+				break;
+			case 'g':
+				gecos = argv[++i];
+				break;
+			case 's':
+				shell = argv[++i];
+				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 1.1 2002/06/04 20:45:05 sandman Exp $ */