release/src/router/dropbear/dropbearconvert.c

   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 #include "crypto_desc.h"
  32 #include "dbrandom.h"
  33
  34
  35 static int do_convert(int intype, const char* infile, int outtype,
  36                 const char* outfile);
  37
  38 static void printhelp(char * progname);
  39
  40 static void printhelp(char * progname) {
  41
  42         fprintf(stderr, "Usage: %s <inputtype> <outputtype> <inputfile> <outputfile>\n\n"
  43                                         "CAUTION: This program is for convenience only, and is not secure if used on\n"
  44                                         "untrusted input files, ie it could allow arbitrary code execution.\n"
  45                                         "All parameters must be specified in order.\n"
  46                                         "\n"
  47                                         "The input and output types are one of:\n"
  48                                         "openssh\n"
  49                                         "dropbear\n"
  50                                         "\n"
  51                                         "Example:\n"
  52                                         "dropbearconvert openssh dropbear /etc/ssh/ssh_host_rsa_key /etc/dropbear_rsa_host_key\n",
  53                                         progname);
  54 }
  55
  56 #if defined(DBMULTI_dropbearconvert) || !defined(DROPBEAR_MULTI)
  57 #if defined(DBMULTI_dropbearconvert) && defined(DROPBEAR_MULTI)
  58 int dropbearconvert_main(int argc, char ** argv) {
  59 #else
  60 int main(int argc, char ** argv) {
  61 #endif
  62
  63         int intype, outtype;
  64         const char* infile;
  65         const char* outfile;
  66
  67         crypto_init();
  68         seedrandom();
  69
  70 #ifdef DEBUG_TRACE
  71         /* It's hard for it to get in the way _too_ much */
  72         debug_trace = 1;
  73 #endif
  74
  75         /* get the commandline options */
  76         if (argc != 5) {
  77                 fprintf(stderr, "All arguments must be specified\n");
  78                 goto usage;
  79         }
  80
  81         /* input type */
  82         if (argv[1][0] == 'd') {
  83                 intype = KEYFILE_DROPBEAR;
  84         } else if (argv[1][0] == 'o') {
  85                 intype = KEYFILE_OPENSSH;
  86         } else {
  87                 fprintf(stderr, "Invalid input key type\n");
  88                 goto usage;
  89         }
  90
  91         /* output type */
  92         if (argv[2][0] == 'd') {
  93                 outtype = KEYFILE_DROPBEAR;
  94         } else if (argv[2][0] == 'o') {
  95                 outtype = KEYFILE_OPENSSH;
  96         } else {
  97                 fprintf(stderr, "Invalid output key type\n");
  98                 goto usage;
  99         }
 100
 101         /* we don't want output readable by others */
 102         umask(077);
 103
 104         infile = argv[3];
 105         outfile = argv[4];
 106
 107         return do_convert(intype, infile, outtype, outfile);
 108
 109 usage:
 110         printhelp(argv[0]);
 111         return 1;
 112 }
 113 #endif
 114
 115 static int do_convert(int intype, const char* infile, int outtype,
 116                 const char* outfile) {
 117
 118         sign_key * key = NULL;
 119         const char * keytype = NULL;
 120         int ret = 1;
 121
 122         key = import_read(infile, NULL, intype);
 123         if (!key) {
 124                 fprintf(stderr, "Error reading key from '%s'\n",
 125                                 infile);
 126                 goto out;
 127         }
 128
 129         keytype = signkey_name_from_type(key->type, NULL);
 130
 131         fprintf(stderr, "Key is a %s key\n", keytype);
 132
 133         if (import_write(outfile, key, NULL, outtype) != 1) {
 134                 fprintf(stderr, "Error writing key to '%s'\n", outfile);
 135         } else {
 136                 fprintf(stderr, "Wrote key to '%s'\n", outfile);
 137                 ret = 0;
 138         }
 139
 140 out:
 141         if (key) {
 142                 sign_key_free(key);
 143         }
 144         return ret;
 145 }