Mercurial > dropbear

annotate dropbearkey.c @ 53:0fe267cc9dee

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Be a bit safer with reentrant pw_name
author Matt Johnston <matt@ucc.asn.au>
date Sun, 08 Aug 2004 16:41:26 +0000
parents 223b0f5f8dce
children b0316ce64e4b
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4
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 /* The format of the keyfiles is basically a raw dump of the buffer. Data types
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26 * are specified in the transport draft - string is a 32-bit len then the
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27 * non-null-terminated string, mp_int is a 32-bit len then the bignum data.
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28 * The actual functions are buf_put_rsa_priv_key() and buf_put_dss_priv_key()
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29
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30 * RSA:
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31 * string "ssh-rsa"
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32 * mp_int e
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33 * mp_int n
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34 * mp_int d
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35 * mp_int p (newer versions only)
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36 * mp_int q (newer versions only)
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37 *
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38 * DSS:
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39 * string "ssh-dss"
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40 * mp_int p
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41 * mp_int q
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42 * mp_int g
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43 * mp_int y
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44 * mp_int x
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45 *
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46 */
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47 #include "includes.h"
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48 #include "runopts.h"
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49 #include "signkey.h"
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50 #include "buffer.h"
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51 #include "dbutil.h"
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52
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53 #include "genrsa.h"
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54 #include "gendss.h"
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55
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56 static void printhelp(char * progname);
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57
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58 #define BUF_SIZE 2000
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59
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60 #define RSA_SIZE (1024/8) /* 1024 bit */
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61 #define DSS_SIZE (1024/8) /* 1024 bit */
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62
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63 static void buf_writefile(buffer * buf, const char * filename);
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64
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65 /* Print a help message */
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66 static void printhelp(char * progname) {
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67
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68 fprintf(stderr, "Usage: %s -t <type> -f <filename> [-s bits]\n"
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69 "Options are:\n"
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70 "-t type Type of key to generate. One of:\n"
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71 #ifdef DROPBEAR_RSA
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72 " rsa\n"
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73 #endif
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74 #ifdef DROPBEAR_DSS
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75 " dss\n"
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76 #endif
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77 "-f filename Use filename for the secret key\n"
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78 "-s bits Key size in bits, should be "
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79 "multiple of 8 (optional)\n",
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80 progname);
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81 }
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82
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83 #if defined(DBMULTI_dropbearkey) || !defined(DROPBEAR_MULTI)
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84 #if defined(DBMULTI_dropbearkey) && defined(DROPBEAR_MULTI)
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85 int dropbearkey_main(int argc, char ** argv) {
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86 #else
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87 int main(int argc, char ** argv) {
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88 #endif
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89
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90 int i;
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91 char ** next = 0;
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92 sign_key *key;
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93 buffer *buf;
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94 char * filename = NULL;
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95 int keytype = -1;
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96 char * typetext = NULL;
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97 char * sizetext = NULL;
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98 unsigned int bits;
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99 unsigned int keysize;
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100
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101 /* get the commandline options */
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102 for (i = 1; i < argc; i++) {
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103 if (next) {
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104 *next = argv[i];
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105 if (*next == NULL) {
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106 fprintf(stderr, "Invalid null argument");
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107 }
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108 next = 0x00;
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109 continue;
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110 }
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111
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112 if (argv[i][0] == '-') {
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113 switch (argv[i][1]) {
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114 case 'f':
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115 next = &filename;
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116 break;
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117 case 't':
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118 next = &typetext;
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119 break;
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120 case 's':
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121 next = &sizetext;
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122 break;
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123 case 'h':
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124 printhelp(argv[0]);
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125 exit(EXIT_SUCCESS);
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126 break;
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127 default:
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128 fprintf(stderr, "Unknown argument %s\n", argv[i]);
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129 printhelp(argv[0]);
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130 exit(EXIT_FAILURE);
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131 break;
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132 }
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133 }
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134 }
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135
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136 /* check/parse args */
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137 if (!typetext) {
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138 fprintf(stderr, "Must specify file type, one of:\n"
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139 #ifdef DROPBEAR_RSA
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140 "rsa\n"
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141 #endif
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142 #ifdef DROPBEAR_DSS
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143 "dss\n"
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144 #endif
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145 "\n"
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146 );
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147 printhelp(argv[0]);
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148 exit(EXIT_FAILURE);
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149 }
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150
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151 if (strlen(typetext) == 3) {
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152 #ifdef DROPBEAR_RSA
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153 if (strncmp(typetext, "rsa", 3) == 0) {
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154 keytype = DROPBEAR_SIGNKEY_RSA;
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155 TRACE(("type is rsa"));
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156 }
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157 #endif
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158 #ifdef DROPBEAR_DSS
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159 if (strncmp(typetext, "dss", 3) == 0) {
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160 keytype = DROPBEAR_SIGNKEY_DSS;
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161 TRACE(("type is dss"));
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162 }
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163 #endif
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164 }
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165 if (keytype == -1) {
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166 fprintf(stderr, "Unknown key type '%s'\n", typetext);
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167 printhelp(argv[0]);
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168 exit(EXIT_FAILURE);
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169 }
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170
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171 if (sizetext) {
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172 if (sscanf(sizetext, "%u", &bits) != 1) {
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173 fprintf(stderr, "Bits must be an integer\n");
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174 exit(EXIT_FAILURE);
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175 }
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176
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177 if (bits < 512 || bits > 4096 || (bits % 8 != 0)) {
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178 fprintf(stderr, "Bits must satisfy 512 <= bits <= 4096, and be a"
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179 " multiple of 8\n");
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180 exit(EXIT_FAILURE);
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181 }
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182
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183 keysize = bits / 8;
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184 } else {
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185 if (keytype == DROPBEAR_SIGNKEY_DSS) {
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186 keysize = DSS_SIZE;
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187 } else if (keytype == DROPBEAR_SIGNKEY_RSA) {
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188 keysize = RSA_SIZE;
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189 } else {
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190 exit(EXIT_FAILURE); /* not reached */
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191 }
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192 }
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193
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194 if (!filename) {
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195 fprintf(stderr, "Must specify a key filename\n");
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196 printhelp(argv[0]);
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197 exit(EXIT_FAILURE);
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198 }
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199
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200 fprintf(stderr, "Will output %d bit %s secret key to '%s'\n", keysize*8,
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201 typetext, filename);
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202
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203 /* don't want the file readable by others */
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204 umask(077);
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205
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206 /* now we can generate the key */
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207 key = new_sign_key();
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208
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209 fprintf(stderr, "Generating key, this may take a while...\n");
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210 switch(keytype) {
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211 #ifdef DROPBEAR_RSA
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212 case DROPBEAR_SIGNKEY_RSA:
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213 key->rsakey = gen_rsa_priv_key(keysize); /* 128 bytes = 1024 bit */
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214 break;
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215 #endif
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216 #ifdef DROPBEAR_DSS
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217 case DROPBEAR_SIGNKEY_DSS:
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218 key->dsskey = gen_dss_priv_key(keysize); /* 128 bytes = 1024 bit */
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219 break;
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220 #endif
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221 default:
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222 fprintf(stderr, "Internal error, bad key type\n");
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223 exit(EXIT_FAILURE);
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224 }
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225
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226 buf = buf_new(BUF_SIZE);
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227
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228 buf_put_priv_key(buf, key, keytype);
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229 buf_setpos(buf, 0);
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230 buf_writefile(buf, filename);
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231
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232 buf_burn(buf);
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233 buf_free(buf);
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234 sign_key_free(key);
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235
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236 fprintf(stderr, "Done.\n");
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237
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238 return EXIT_SUCCESS;
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239 }
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240 #endif
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241
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242 /* Write a buffer to a file specified, failing if the file exists */
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243 static void buf_writefile(buffer * buf, const char * filename) {
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244
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245 int fd;
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246 int len;
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247
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248 fd = open(filename, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
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249 if (fd < 0) {
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250 fprintf(stderr, "Couldn't create new file %s\n", filename);
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251 perror("Reason");
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252 buf_burn(buf);
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253 exit(EXIT_FAILURE);
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254 }
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255
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256 /* write the file now */
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diff changeset
257 while (buf->pos != buf->len) {
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258 len = write(fd, buf_getptr(buf, buf->len - buf->pos),
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diff changeset
259 buf->len - buf->pos);
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diff changeset
260 if (errno == EINTR) {
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diff changeset
261 continue;
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parents:
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262 }
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263 if (len <= 0) {
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264 fprintf(stderr, "Failed writing file '%s'\n",filename);
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265 perror("Reason");
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266 exit(EXIT_FAILURE);
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diff changeset
267 }
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268 buf_incrpos(buf, len);
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269 }
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270
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271 close(fd);
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272 }