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annotate dropbearkey.c @ 70:b0316ce64e4b

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Merging in the changes from 0.41-0.43 main Dropbear tree
author Matt Johnston <matt@ucc.asn.au>
date Thu, 12 Aug 2004 16:41:58 +0000
parents 223b0f5f8dce
children 0bf5cebe622c
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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 "signkey.h"
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49 #include "buffer.h"
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50 #include "dbutil.h"
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51
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52 #include "genrsa.h"
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53 #include "gendss.h"
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54
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55 static void printhelp(char * progname);
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56
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57 #define BUF_SIZE 2000
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58
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59 #define RSA_SIZE (1024/8) /* 1024 bit */
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60 #define DSS_SIZE (1024/8) /* 1024 bit */
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61
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62 static void buf_writefile(buffer * buf, const char * filename);
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63
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64 /* Print a help message */
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65 static void printhelp(char * progname) {
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66
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67 fprintf(stderr, "Usage: %s -t <type> -f <filename> [-s bits]\n"
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68 "Options are:\n"
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69 "-t type Type of key to generate. One of:\n"
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70 #ifdef DROPBEAR_RSA
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71 " rsa\n"
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72 #endif
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73 #ifdef DROPBEAR_DSS
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74 " dss\n"
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75 #endif
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76 "-f filename Use filename for the secret key\n"
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77 "-s bits Key size in bits, should be "
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78 "multiple of 8 (optional)\n",
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79 progname);
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80 }
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81
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82 #if defined(DBMULTI_dropbearkey) || !defined(DROPBEAR_MULTI)
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83 #if defined(DBMULTI_dropbearkey) && defined(DROPBEAR_MULTI)
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84 int dropbearkey_main(int argc, char ** argv) {
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85 #else
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86 int main(int argc, char ** argv) {
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87 #endif
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88
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89 int i;
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90 char ** next = 0;
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91 sign_key *key;
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92 buffer *buf;
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93 char * filename = NULL;
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94 int keytype = -1;
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95 char * typetext = NULL;
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96 char * sizetext = NULL;
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97 unsigned int bits;
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98 unsigned int keysize;
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99
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100 /* get the commandline options */
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101 for (i = 1; i < argc; i++) {
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102 if (next) {
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103 *next = argv[i];
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104 if (*next == NULL) {
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105 fprintf(stderr, "Invalid null argument");
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106 }
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107 next = 0x00;
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108 continue;
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109 }
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110
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111 if (argv[i][0] == '-') {
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112 switch (argv[i][1]) {
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113 case 'f':
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114 next = &filename;
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115 break;
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116 case 't':
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117 next = &typetext;
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118 break;
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119 case 's':
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120 next = &sizetext;
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121 break;
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122 case 'h':
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123 printhelp(argv[0]);
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124 exit(EXIT_SUCCESS);
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125 break;
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126 default:
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127 fprintf(stderr, "Unknown argument %s\n", argv[i]);
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128 printhelp(argv[0]);
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129 exit(EXIT_FAILURE);
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130 break;
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131 }
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132 }
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133 }
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134
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135 /* check/parse args */
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136 if (!typetext) {
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137 fprintf(stderr, "Must specify file type, one of:\n"
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138 #ifdef DROPBEAR_RSA
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139 "rsa\n"
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140 #endif
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141 #ifdef DROPBEAR_DSS
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142 "dss\n"
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143 #endif
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144 "\n"
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145 );
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146 printhelp(argv[0]);
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147 exit(EXIT_FAILURE);
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148 }
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149
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150 if (strlen(typetext) == 3) {
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151 #ifdef DROPBEAR_RSA
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152 if (strncmp(typetext, "rsa", 3) == 0) {
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153 keytype = DROPBEAR_SIGNKEY_RSA;
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154 TRACE(("type is rsa"));
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155 }
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156 #endif
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157 #ifdef DROPBEAR_DSS
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158 if (strncmp(typetext, "dss", 3) == 0) {
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159 keytype = DROPBEAR_SIGNKEY_DSS;
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160 TRACE(("type is dss"));
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161 }
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162 #endif
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163 }
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164 if (keytype == -1) {
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165 fprintf(stderr, "Unknown key type '%s'\n", typetext);
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166 printhelp(argv[0]);
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167 exit(EXIT_FAILURE);
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168 }
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169
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170 if (sizetext) {
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171 if (sscanf(sizetext, "%u", &bits) != 1) {
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172 fprintf(stderr, "Bits must be an integer\n");
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173 exit(EXIT_FAILURE);
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174 }
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175
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176 if (bits < 512 || bits > 4096 || (bits % 8 != 0)) {
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177 fprintf(stderr, "Bits must satisfy 512 <= bits <= 4096, and be a"
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178 " multiple of 8\n");
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179 exit(EXIT_FAILURE);
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180 }
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181
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182 keysize = bits / 8;
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183 } else {
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184 if (keytype == DROPBEAR_SIGNKEY_DSS) {
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185 keysize = DSS_SIZE;
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186 } else if (keytype == DROPBEAR_SIGNKEY_RSA) {
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187 keysize = RSA_SIZE;
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188 } else {
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189 exit(EXIT_FAILURE); /* not reached */
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190 }
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191 }
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192
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193 if (!filename) {
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194 fprintf(stderr, "Must specify a key filename\n");
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195 printhelp(argv[0]);
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196 exit(EXIT_FAILURE);
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197 }
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198
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199 fprintf(stderr, "Will output %d bit %s secret key to '%s'\n", keysize*8,
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200 typetext, filename);
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201
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202 /* don't want the file readable by others */
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203 umask(077);
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204
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205 /* now we can generate the key */
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206 key = new_sign_key();
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207
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208 fprintf(stderr, "Generating key, this may take a while...\n");
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209 switch(keytype) {
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210 #ifdef DROPBEAR_RSA
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211 case DROPBEAR_SIGNKEY_RSA:
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212 key->rsakey = gen_rsa_priv_key(keysize); /* 128 bytes = 1024 bit */
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213 break;
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214 #endif
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215 #ifdef DROPBEAR_DSS
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216 case DROPBEAR_SIGNKEY_DSS:
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217 key->dsskey = gen_dss_priv_key(keysize); /* 128 bytes = 1024 bit */
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218 break;
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219 #endif
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220 default:
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221 fprintf(stderr, "Internal error, bad key type\n");
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222 exit(EXIT_FAILURE);
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223 }
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224
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225 buf = buf_new(BUF_SIZE);
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226
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227 buf_put_priv_key(buf, key, keytype);
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228 buf_setpos(buf, 0);
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229 buf_writefile(buf, filename);
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230
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231 buf_burn(buf);
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232 buf_free(buf);
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233 sign_key_free(key);
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234
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235 fprintf(stderr, "Done.\n");
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236
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237 return EXIT_SUCCESS;
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238 }
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239 #endif
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240
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241 /* Write a buffer to a file specified, failing if the file exists */
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242 static void buf_writefile(buffer * buf, const char * filename) {
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243
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244 int fd;
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245 int len;
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246
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247 fd = open(filename, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
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248 if (fd < 0) {
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249 fprintf(stderr, "Couldn't create new file %s\n", filename);
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diff changeset
250 perror("Reason");
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251 buf_burn(buf);
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252 exit(EXIT_FAILURE);
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253 }
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254
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255 /* write the file now */
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diff changeset
256 while (buf->pos != buf->len) {
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257 len = write(fd, buf_getptr(buf, buf->len - buf->pos),
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diff changeset
258 buf->len - buf->pos);
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diff changeset
259 if (errno == EINTR) {
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diff changeset
260 continue;
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parents:
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261 }
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262 if (len <= 0) {
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263 fprintf(stderr, "Failed writing file '%s'\n",filename);
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diff changeset
264 perror("Reason");
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265 exit(EXIT_FAILURE);
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diff changeset
266 }
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267 buf_incrpos(buf, len);
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268 }
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269
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270 close(fd);
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271 }