1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) tons of folks. Tracking down who wrote what
6 * isn't something I'm going to worry about... If you wrote something
7 * here, please feel free to acknowledge your work.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
24 * Permission has been granted to redistribute this code under the GPL.
39 struct BB_applet *applet_using;
41 /* The -1 arises because of the {0,NULL,0,-1} entry above. */
42 const size_t NUM_APPLETS = (sizeof (applets) / sizeof (struct BB_applet) - 1);
45 #ifdef CONFIG_FEATURE_SUID
47 static void check_suid (struct BB_applet *app);
49 #ifdef CONFIG_FEATURE_SUID_CONFIG
56 static int parse_config_file (void);
60 #define CONFIG_FILE "/etc/busybox.conf"
62 /* applets [] is const, so we have to define this "override" structure */
65 struct BB_applet *m_applet;
71 struct BB_suid_config *m_next;
74 static struct BB_suid_config *suid_config;
76 #endif /* CONFIG_FEATURE_SUID_CONFIG */
78 #endif /* CONFIG_FEATURE_SUID */
85 const char *format_string;
86 const char *usage_string = usage_messages;
89 for (i = applet_using - applets; i > 0;) {
90 if (!*usage_string++) {
95 format_string = "%s\n\nUsage: %s %s\n\n";
96 if (*usage_string == '\b')
97 format_string = "%s\n\nNo help available.\n\n";
98 fprintf (stderr, format_string, bb_msg_full_version, applet_using->name,
105 applet_name_compare (const void *x, const void *y)
107 const char *name = x;
108 const struct BB_applet *applet = y;
110 return strcmp (name, applet->name);
113 extern const size_t NUM_APPLETS;
116 find_applet_by_name (const char *name)
118 return bsearch (name, applets, NUM_APPLETS, sizeof (struct BB_applet),
119 applet_name_compare);
123 run_applet_by_name (const char *name, int argc, char **argv)
125 static int recurse_level = 0;
126 extern int been_there_done_that; /* From busybox.c */
128 #ifdef CONFIG_FEATURE_SUID_CONFIG
129 if (recurse_level == 0)
130 config_ok = parse_config_file ();
134 /* Do a binary search to find the applet entry given the name. */
135 if ((applet_using = find_applet_by_name (name)) != NULL) {
136 bb_applet_name = applet_using->name;
137 if (argv[1] && strcmp (argv[1], "--help") == 0) {
138 if (strcmp (applet_using->name, "busybox") == 0) {
140 applet_using = find_applet_by_name (argv[2]);
146 been_there_done_that = 1;
147 busybox_main (0, NULL);
149 #ifdef CONFIG_FEATURE_SUID
150 check_suid (applet_using);
153 exit ((*(applet_using->main)) (argc, argv));
155 /* Just in case they have renamed busybox - Check argv[1] */
156 if (recurse_level == 1) {
157 run_applet_by_name ("busybox", argc, argv);
163 #ifdef CONFIG_FEATURE_SUID
165 #ifdef CONFIG_FEATURE_SUID_CONFIG
167 /* check if u is member of group g */
169 ingroup (uid_t u, gid_t g)
171 struct group *grp = getgrgid (g);
176 for (mem = grp->gr_mem; *mem; mem++) {
177 struct passwd *pwd = getpwnam (*mem);
179 if (pwd && (pwd->pw_uid == u))
190 check_suid (struct BB_applet *applet)
192 uid_t ruid = getuid (); /* real [ug]id */
193 uid_t rgid = getgid ();
195 #ifdef CONFIG_FEATURE_SUID_CONFIG
197 struct BB_suid_config *sct;
199 for (sct = suid_config; sct; sct = sct->m_next) {
200 if (sct->m_applet == applet)
204 mode_t m = sct->m_mode;
206 if (sct->m_uid == ruid) /* same uid */
208 else if ((sct->m_gid == rgid) || ingroup (ruid, sct->m_gid)) /* same group / in group */
211 if (!(m & S_IXOTH)) /* is x bit not set ? */
212 bb_error_msg_and_die ("You have no permission to run this applet!");
214 if ((sct->m_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { /* *both* have to be set for sgid */
215 if (setegid (sct->m_gid))
217 ("BusyBox binary has insufficient rights to set proper GID for applet!");
219 setgid (rgid); /* no sgid -> drop */
221 if (sct->m_mode & S_ISUID) {
222 if (seteuid (sct->m_uid))
224 ("BusyBox binary has insufficient rights to set proper UID for applet!");
226 setuid (ruid); /* no suid -> drop */
228 /* default: drop all priviledges */
234 #ifndef CONFIG_FEATURE_SUID_CONFIG_QUIET
235 static int onetime = 0;
239 fprintf (stderr, "Using fallback suid method\n");
245 if (applet->need_suid == _BB_SUID_ALWAYS) {
247 bb_error_msg_and_die ("This applet requires root priviledges!");
248 } else if (applet->need_suid == _BB_SUID_NEVER) {
249 setgid (rgid); /* drop all priviledges */
254 #ifdef CONFIG_FEATURE_SUID_CONFIG
257 #define parse_error(x) { err=x; goto pe_label; }
261 parse_config_file (void)
270 /* is there a config file ? */
271 if (stat (CONFIG_FILE, &st) == 0) {
272 /* is it owned by root with no write perm. for group and others ? */
273 if (S_ISREG (st.st_mode) && (st.st_uid == 0)
274 && (!(st.st_mode & (S_IWGRP | S_IWOTH)))) {
275 /* that's ok .. then try to open it */
276 f = fopen (CONFIG_FILE, "r");
282 while (fgets (buffer, sizeof (buffer) - 1, f)) {
288 p = strchr (buffer, '#');
291 p = buffer + bb_strlen (buffer);
292 while ((p > buffer) && isspace (*--p))
299 p = strchr (buffer, ']');
301 if (!p || (p == (buffer + 1))) /* no matching ] or empty [] */
302 parse_error ("malformed section header");
306 if (strcasecmp (buffer + 1, "SUID") == 0)
309 section = -1; /* unknown section - just skip */
310 } else if (section) {
314 struct BB_applet *applet;
316 p = strchr (buffer, '='); /* <key>[::space::]*=[::space::]*<value> */
318 if (!p || (p == (buffer + 1))) /* no = or key is empty */
319 parse_error ("malformed keyword");
322 while (isspace (buffer[--l])) {
323 /* skip whitespace */
328 if ((applet = find_applet_by_name (buffer))) {
329 struct BB_suid_config *sct =
330 xmalloc (sizeof (struct BB_suid_config));
332 sct->m_applet = applet;
333 sct->m_next = suid_config;
336 while (isspace (*++p)) {
337 /* skip whitespace */
344 sct->m_mode |= S_ISUID;
347 sct->m_mode |= S_ISUID;
350 sct->m_mode |= S_IXUSR;
355 parse_error ("invalid user mode");
360 sct->m_mode |= S_ISGID;
363 sct->m_mode |= S_IXGRP;
370 parse_error ("invalid group mode");
376 sct->m_mode |= S_IXOTH;
382 parse_error ("invalid other mode");
385 while (isspace (*++p)) {
386 /* skip whitespace */
390 sct->m_uid = strtol (p, &p, 10);
392 parse_error ("parsing <uid>.<gid>");
395 char *p2 = strchr (p, '.');
398 parse_error ("parsing <uid>.<gid>");
404 parse_error ("invalid user name");
406 sct->m_uid = pwd->pw_uid;
410 sct->m_gid = strtol (p, &p, 10);
412 struct group *grp = getgrnam (p);
415 parse_error ("invalid group name");
417 sct->m_gid = grp->gr_gid;
422 default: /* unknown - skip */
426 parse_error ("keyword not within section");
433 return 0; /* no config file or not readable (not an error) */
436 fprintf (stderr, "Parse error in %s, line %d: %s\n", CONFIG_FILE, lc, err);
450 c-file-style: "linux"