/* vi: set sw=4 ts=4: */
/*
- * Utility routines.
+ * Stub for linking busybox binary against libbusybox.
*
- * Copyright (C) tons of folks. Tracking down who wrote what
- * isn't something I'm going to worry about... If you wrote something
- * here, please feel free to acknowledge your work.
- *
- * 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
- *
- * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
- * Permission has been granted to redistribute this code under the GPL.
+ * Copyright (C) 2007 Denys Vlasenko <vda.linux@googlemail.com>
*
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
-
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
#include "busybox.h"
-#undef APPLET
-#undef APPLET_NOUSAGE
-#undef PROTOTYPES
-#include "applets.h"
-
-struct BB_applet *applet_using;
-
-/* The -1 arises because of the {0,NULL,0,-1} entry above. */
-const size_t NUM_APPLETS = (sizeof (applets) / sizeof (struct BB_applet) - 1);
-
-
-#ifdef CONFIG_FEATURE_SUID
-
-static void check_suid ( struct BB_applet *app );
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
-
-#include <sys/stat.h>
-#include <ctype.h>
-#include "pwd_.h"
-#include "grp_.h"
-
-static int parse_config_file ( void );
-
-static int config_ok;
-
-#define CONFIG_FILE "/etc/busybox.conf"
-
-// applets [] is const, so we have to define this "override" structure
-struct BB_suid_config {
- struct BB_applet *m_applet;
-
- uid_t m_uid;
- gid_t m_gid;
- mode_t m_mode;
-
- struct BB_suid_config *m_next;
-};
-
-static struct BB_suid_config *suid_config;
-
-#endif // CONFIG_FEATURE_SUID_CONFIG
-
-#endif // CONFIG_FEATURE_SUID
-
-
-
-extern void show_usage(void)
-{
- const char *format_string;
- const char *usage_string = usage_messages;
- int i;
-
- for (i = applet_using - applets; i > 0; ) {
- if (!*usage_string++) {
- --i;
- }
- }
- format_string = "%s\n\nUsage: %s %s\n\n";
- if(*usage_string == 0)
- format_string = "%s\n\nNo help available.\n\n";
- fprintf(stderr, format_string,
- full_version, applet_using->name, usage_string);
- exit(EXIT_FAILURE);
-}
-
-static int applet_name_compare(const void *x, const void *y)
+#if ENABLE_BUILD_LIBBUSYBOX
+int main(int argc UNUSED_PARAM, char **argv)
{
- const char *name = x;
- const struct BB_applet *applet = y;
-
- return strcmp(name, applet->name);
-}
-
-extern const size_t NUM_APPLETS;
-
-struct BB_applet *find_applet_by_name(const char *name)
-{
- return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
- applet_name_compare);
+ return lbb_main(argv);
}
-
-void run_applet_by_name(const char *name, int argc, char **argv)
-{
- static int recurse_level = 0;
- extern int been_there_done_that; /* From busybox.c */
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
- if ( recurse_level == 0 )
- config_ok = parse_config_file ( );
#endif
-
- recurse_level++;
- /* Do a binary search to find the applet entry given the name. */
- if ((applet_using = find_applet_by_name(name)) != NULL) {
- applet_name = applet_using->name;
- if (argv[1] && strcmp(argv[1], "--help") == 0) {
- if (strcmp(applet_using->name, "busybox")==0) {
- if(argv[2])
- applet_using = find_applet_by_name(argv[2]);
- else
- applet_using = NULL;
- }
- if(applet_using)
- show_usage();
- been_there_done_that=1;
- busybox_main(0, NULL);
- }
-#ifdef CONFIG_FEATURE_SUID
- check_suid ( applet_using );
-#endif
-
- exit((*(applet_using->main)) (argc, argv));
- }
- /* Just in case they have renamed busybox - Check argv[1] */
- if (recurse_level == 1) {
- run_applet_by_name("busybox", argc, argv);
- }
- recurse_level--;
-}
-
-
-#ifdef CONFIG_FEATURE_SUID
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
-
-// check if u is member of group g
-static int ingroup ( uid_t u, gid_t g )
-{
- struct group *grp = getgrgid ( g );
-
- if ( grp ) {
- char **mem;
-
- for ( mem = grp-> gr_mem; *mem; mem++ ) {
- struct passwd *pwd = getpwnam ( *mem );
-
- if ( pwd && ( pwd-> pw_uid == u ))
- return 1;
- }
- }
- return 0;
-}
-
-#endif
-
-
-void check_suid ( struct BB_applet *applet )
-{
- uid_t ruid = getuid ( ); // real [ug]id
- uid_t rgid = getgid ( );
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
- if ( config_ok ) {
- struct BB_suid_config *sct;
-
- for ( sct = suid_config; sct; sct = sct-> m_next ) {
- if ( sct-> m_applet == applet )
- break;
- }
- if ( sct ) {
- mode_t m = sct-> m_mode;
-
- if ( sct-> m_uid == ruid ) // same uid
- m >>= 6;
- else if (( sct-> m_gid == rgid ) || ingroup ( ruid, sct-> m_gid )) // same group / in group
- m >>= 3;
-
- if (!( m & S_IXOTH )) // is x bit not set ?
- error_msg_and_die ( "You have no permission to run this applet!" );
-
- if (( sct-> m_mode & ( S_ISGID | S_IXGRP )) == ( S_ISGID | S_IXGRP )) { // *both* have to be set for sgid
- if ( setegid ( sct-> m_gid ))
- error_msg_and_die ( "BusyBox binary has insufficient rights to set proper GID for applet!" );
- }
- else
- setgid ( rgid ); // no sgid -> drop
-
- if ( sct-> m_mode & S_ISUID ) {
- if ( seteuid ( sct-> m_uid ))
- error_msg_and_die ( "BusyBox binary has insufficient rights to set proper UID for applet!" );
- }
- else
- setuid ( ruid ); // no suid -> drop
- }
- else { // default: drop all priviledges
- setgid ( rgid );
- setuid ( ruid );
- }
- return;
- }
- else {
-#ifndef CONFIG_FEATURE_SUID_CONFIG_QUIET
- static int onetime = 0;
-
- if ( !onetime ) {
- onetime = 1;
- fprintf ( stderr, "Using fallback suid method\n" );
- }
-#endif
- }
-#endif
-
- if ( applet-> need_suid == _BB_SUID_ALWAYS ) {
- if ( geteuid ( ) != 0 )
- error_msg_and_die ( "This applet requires root priviledges!" );
- }
- else if ( applet-> need_suid == _BB_SUID_NEVER ) {
- setgid ( rgid ); // drop all priviledges
- setuid ( ruid );
- }
-}
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
-
-
-#define parse_error(x) { err=x; goto pe_label; }
-
-
-int parse_config_file ( void )
-{
- struct stat st;
- char *err = 0;
- FILE *f = 0;
- int lc = 0;
-
- suid_config = 0;
-
- // is there a config file ?
- if ( stat ( CONFIG_FILE, &st ) == 0 ) {
- // is it owned by root with no write perm. for group and others ?
- if ( S_ISREG( st. st_mode ) && ( st. st_uid == 0 ) && (!( st. st_mode & ( S_IWGRP | S_IWOTH )))) {
- // that's ok .. then try to open it
- f = fopen ( CONFIG_FILE, "r" );
-
- if ( f ) {
- char buffer [256];
- int section = 0;
-
- while ( fgets ( buffer, sizeof( buffer ) - 1, f )) {
- char c = buffer [0];
- char *p;
-
- lc++;
-
- p = strchr ( buffer, '#' );
- if ( p )
- *p = 0;
- p = buffer + xstrlen ( buffer );
- while (( p > buffer ) && isspace ( *--p ))
- *p = 0;
-
- if ( p == buffer )
- continue;
-
- if ( c == '[' ) {
- p = strchr ( buffer, ']' );
-
- if ( !p || ( p == ( buffer + 1 ))) // no matching ] or empty []
- parse_error ( "malformed section header" );
-
- *p = 0;
-
- if ( strcasecmp ( buffer + 1, "SUID" ) == 0 )
- section = 1;
- else
- section = -1; // unknown section - just skip
- }
- else if ( section ) {
- switch ( section ) {
- case 1: { // SUID
- int l;
- struct BB_applet *applet;
-
- p = strchr ( buffer, '=' ); // <key>[::space::]*=[::space::]*<value>
-
- if ( !p || ( p == ( buffer + 1 ))) // no = or key is empty
- parse_error ( "malformed keyword" );
-
- l = p - buffer;
- while ( isspace ( buffer [--l] )) { } // skip whitespace
-
- buffer [l+1] = 0;
-
- if (( applet = find_applet_by_name ( buffer ))) {
- struct BB_suid_config *sct = xmalloc ( sizeof( struct BB_suid_config ));
-
- sct-> m_applet = applet;
- sct-> m_next = suid_config;
- suid_config = sct;
-
- while ( isspace ( *++p )) { } // skip whitespace
-
- sct-> m_mode = 0;
-
- switch ( *p++ ) {
- case 'S': sct-> m_mode |= S_ISUID; break;
- case 's': sct-> m_mode |= S_ISUID; // no break
- case 'x': sct-> m_mode |= S_IXUSR; break;
- case '-': break;
- default : parse_error ( "invalid user mode" );
- }
-
- switch ( *p++ ) {
- case 's': sct-> m_mode |= S_ISGID; // no break
- case 'x': sct-> m_mode |= S_IXGRP; break;
- case 'S': break;
- case '-': break;
- default : parse_error ( "invalid group mode" );
- }
-
- switch ( *p ) {
- case 't':
- case 'x': sct-> m_mode |= S_IXOTH; break;
- case 'T':
- case '-': break;
- default : parse_error ( "invalid other mode" );
- }
-
- while ( isspace ( *++p )) { } // skip whitespace
-
- if ( isdigit ( *p )) {
- sct-> m_uid = strtol ( p, &p, 10 );
- if ( *p++ != '.' )
- parse_error ( "parsing <uid>.<gid>" );
- }
- else {
- struct passwd *pwd;
- char *p2 = strchr ( p, '.' );
-
- if ( !p2 )
- parse_error ( "parsing <uid>.<gid>" );
-
- *p2 = 0;
- pwd = getpwnam ( p );
-
- if ( !pwd )
- parse_error ( "invalid user name" );
-
- sct-> m_uid = pwd-> pw_uid;
- p = p2 + 1;
- }
- if ( isdigit ( *p ))
- sct-> m_gid = strtol ( p, &p, 10 );
- else {
- struct group *grp = getgrnam ( p );
-
- if ( !grp )
- parse_error ( "invalid group name" );
-
- sct-> m_gid = grp-> gr_gid;
- }
- }
- break;
- }
- default: // unknown - skip
- break;
- }
- }
- else
- parse_error ( "keyword not within section" );
- }
- fclose ( f );
- return 1;
- }
- }
- }
- return 0; // no config file or not readable (not an error)
-
-pe_label:
- fprintf ( stderr, "Parse error in %s, line %d: %s\n", CONFIG_FILE, lc, err );
-
- if ( f )
- fclose ( f );
- return 0;
-}
-
-#endif
-
-#endif
-
-/* END CODE */
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
projects / oweals / busybox.git / blobdiff