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      1 /*
      2  * Dropbear - a SSH2 server
      3  *
      4  * Copyright (c) 2002,2003 Matt Johnston
      5  * All rights reserved.
      6  *
      7  * Permission is hereby granted, free of charge, to any person obtaining a copy
      8  * of this software and associated documentation files (the "Software"), to deal
      9  * in the Software without restriction, including without limitation the rights
     10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     11  * copies of the Software, and to permit persons to whom the Software is
     12  * furnished to do so, subject to the following conditions:
     13  *
     14  * The above copyright notice and this permission notice shall be included in
     15  * all copies or substantial portions of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     23  * SOFTWARE. */
     24 
     25 /* This program converts to/from Dropbear and OpenSSH private-key formats */
     26 #include "includes.h"
     27 #include "signkey.h"
     28 #include "buffer.h"
     29 #include "dbutil.h"
     30 #include "keyimport.h"
     31 
     32 
     33 static int do_convert(int intype, const char* infile, int outtype,
     34 		const char* outfile);
     35 
     36 static void printhelp(char * progname);
     37 
     38 static void printhelp(char * progname) {
     39 
     40 	fprintf(stderr, "Usage: %s <inputtype> <outputtype> <inputfile> <outputfile>\n\n"
     41 					"CAUTION: This program is for convenience only, and is not secure if used on\n"
     42 					"untrusted input files, ie it could allow arbitrary code execution.\n"
     43 					"All parameters must be specified in order.\n"
     44 					"\n"
     45 					"The input and output types are one of:\n"
     46 					"openssh\n"
     47 					"dropbear\n"
     48 					"\n"
     49 					"Example:\n"
     50 					"dropbearconvert openssh dropbear /etc/ssh/ssh_host_rsa_key /etc/dropbear_rsa_host_key\n",
     51 					progname);
     52 }
     53 
     54 #if defined(DBMULTI_dropbearconvert) || !defined(DROPBEAR_MULTI)
     55 #if defined(DBMULTI_dropbearconvert) && defined(DROPBEAR_MULTI)
     56 int dropbearconvert_main(int argc, char ** argv) {
     57 #else
     58 int main(int argc, char ** argv) {
     59 #endif
     60 
     61 	int intype, outtype;
     62 	const char* infile;
     63 	const char* outfile;
     64 
     65 #ifdef DEBUG_TRACE
     66 	/* It's hard for it to get in the way _too_ much */
     67 	debug_trace = 1;
     68 #endif
     69 
     70 	/* get the commandline options */
     71 	if (argc != 5) {
     72 		fprintf(stderr, "All arguments must be specified\n");
     73 		goto usage;
     74 	}
     75 
     76 	/* input type */
     77 	if (argv[1][0] == 'd') {
     78 		intype = KEYFILE_DROPBEAR;
     79 	} else if (argv[1][0] == 'o') {
     80 		intype = KEYFILE_OPENSSH;
     81 	} else {
     82 		fprintf(stderr, "Invalid input key type\n");
     83 		goto usage;
     84 	}
     85 
     86 	/* output type */
     87 	if (argv[2][0] == 'd') {
     88 		outtype = KEYFILE_DROPBEAR;
     89 	} else if (argv[2][0] == 'o') {
     90 		outtype = KEYFILE_OPENSSH;
     91 	} else {
     92 		fprintf(stderr, "Invalid output key type\n");
     93 		goto usage;
     94 	}
     95 
     96 	/* we don't want output readable by others */
     97 	umask(077);
     98 
     99 	infile = argv[3];
    100 	outfile = argv[4];
    101 
    102 	return do_convert(intype, infile, outtype, outfile);
    103 
    104 usage:
    105 	printhelp(argv[0]);
    106 	return 1;
    107 }
    108 #endif
    109 
    110 static int do_convert(int intype, const char* infile, int outtype,
    111 		const char* outfile) {
    112 
    113 	sign_key * key = NULL;
    114 	char * keytype = NULL;
    115 	int ret = 1;
    116 
    117 	key = import_read(infile, NULL, intype);
    118 	if (!key) {
    119 		fprintf(stderr, "Error reading key from '%s'\n",
    120 				infile);
    121 		goto out;
    122 	}
    123 
    124 #ifdef DROPBEAR_RSA
    125 	if (key->rsakey != NULL) {
    126 		keytype = "RSA";
    127 	}
    128 #endif
    129 #ifdef DROPBEAR_DSS
    130 	if (key->dsskey != NULL) {
    131 		keytype = "DSS";
    132 	}
    133 #endif
    134 
    135 	fprintf(stderr, "Key is a %s key\n", keytype);
    136 
    137 	if (import_write(outfile, key, NULL, outtype) != 1) {
    138 		fprintf(stderr, "Error writing key to '%s'\n", outfile);
    139 	} else {
    140 		fprintf(stderr, "Wrote key to '%s'\n", outfile);
    141 		ret = 0;
    142 	}
    143 
    144 out:
    145 	if (key) {
    146 		sign_key_free(key);
    147 	}
    148 	return ret;
    149 }
    150