view dbmulti.c @ 1930:299f4f19ba19

Add /usr/sbin and /sbin to default root PATH When dropbear is used in a very restricted environment (such as in a initrd), the default user shell is often also very restricted and doesn't take care of setting the PATH so the user ends up with the PATH set by dropbear. Unfortunately, dropbear always sets "/usr/bin:/bin" as default PATH even for the root user which should have /usr/sbin and /sbin too. For a concrete instance of this problem, see the "Remote Unlocking" section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/ It speaks of a bug in the initramfs script because it's written "blkid" instead of "/sbin/blkid"... this is just because the scripts from the initramfs do not expect to have a PATH without the sbin directories and because dropbear is not setting the PATH appropriately for the root user. I'm thus suggesting to use the attached patch to fix this misbehaviour (I did not test it, but it's easy enough). It might seem anecdotic but multiple Kali users have been bitten by this. From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author Raphael Hertzog <hertzog@debian.org>
date Mon, 09 Jul 2018 16:27:53 +0200
parents 6b25cdad4783
children
line wrap: on
line source

/*
 * Dropbear SSH
 * 
 * Copyright (c) 2002,2003 Matt Johnston
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE. */

#include "includes.h"
#include "dbutil.h"

static int runprog(const char *multipath,
		const char *progname, int argc, char ** argv, int *match) {
	*match = DROPBEAR_SUCCESS;

#ifdef DBMULTI_dropbear
		if (strcmp(progname, "dropbear") == 0) {
			return dropbear_main(argc, argv, multipath);
		}
#endif
#ifdef DBMULTI_dbclient
		if (strcmp(progname, "dbclient") == 0
				|| strcmp(progname, "ssh") == 0) {
			return cli_main(argc, argv);
		}
#endif
#ifdef DBMULTI_dropbearkey
		if (strcmp(progname, "dropbearkey") == 0) {
			return dropbearkey_main(argc, argv);
		}
#endif
#ifdef DBMULTI_dropbearconvert
		if (strcmp(progname, "dropbearconvert") == 0) {
			return dropbearconvert_main(argc, argv);
		}
#endif
#ifdef DBMULTI_scp
		if (strcmp(progname, "scp") == 0) {
			return scp_main(argc, argv);
		}
#endif
	*match = DROPBEAR_FAILURE;
	return 1;
}

int main(int argc, char ** argv) {
	int i;
	for (i = 0; i < 2; i++) {
		const char* multipath = NULL;
		if (i == 1) {
			multipath = argv[0];
		}
		/* Try symlink first, then try as an argument eg "dropbearmulti dbclient host ..." */
		if (argc > i) {
			int match, res;
			/* figure which form we're being called as */
			const char* progname = basename(argv[i]);
			res = runprog(multipath, progname, argc-i, &argv[i], &match);
			if (match == DROPBEAR_SUCCESS) {
				return res;
			}
		}
	}

	fprintf(stderr, "Dropbear SSH multi-purpose v%s\n"
			"Make a symlink pointing at this binary with one of the\n"
			"following names or run 'dropbearmulti <command>'.\n"
#ifdef DBMULTI_dropbear
			"'dropbear' - the Dropbear server\n"
#endif
#ifdef DBMULTI_dbclient
			"'dbclient' or 'ssh' - the Dropbear client\n"
#endif
#ifdef DBMULTI_dropbearkey
			"'dropbearkey' - the key generator\n"
#endif
#ifdef DBMULTI_dropbearconvert
			"'dropbearconvert' - the key converter\n"
#endif
#ifdef DBMULTI_scp
			"'scp' - secure copy\n"
#endif
			,
			DROPBEAR_VERSION);
	exit(1);

}