Mercurial > dropbear
annotate dropbearkey.c @ 207:85cc531f711e
merge of 72b0db220b7fc6b4fb6079d6b82c843186bab5a7
and feb4fdd2cc17783a3cd158d06be59a57382b398d
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 02 Jun 2005 16:21:58 +0000 |
parents | 0cfba3034be5 |
children | 740e782679be bc7c134982df |
rev | line source |
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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 RSA_SIZE (1024/8) /* 1024 bit */ |
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58 #define DSS_SIZE (1024/8) /* 1024 bit */ |
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59 |
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60 static void buf_writefile(buffer * buf, const char * filename); |
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61 static void printpubkey(sign_key * key, int keytype); |
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62 static void justprintpub(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 a multiple of 8 (optional)\n" |
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78 "-y Just print the publickey and fingerprint for the\n private key in <filename>.\n" |
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79 #ifdef DEBUG_TRACE |
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80 "-v verbose\n" |
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81 #endif |
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82 ,progname); |
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83 } |
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84 |
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85 #if defined(DBMULTI_dropbearkey) || !defined(DROPBEAR_MULTI) |
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86 #if defined(DBMULTI_dropbearkey) && defined(DROPBEAR_MULTI) |
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87 int dropbearkey_main(int argc, char ** argv) { |
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88 #else |
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89 int main(int argc, char ** argv) { |
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90 #endif |
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91 |
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92 int i; |
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93 char ** next = 0; |
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94 sign_key *key = NULL; |
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95 buffer *buf = NULL; |
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96 char * filename = NULL; |
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97 int keytype = -1; |
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98 char * typetext = NULL; |
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99 char * sizetext = NULL; |
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100 unsigned int bits; |
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101 unsigned int keysize; |
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102 int printpub = 0; |
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103 |
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104 /* get the commandline options */ |
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105 for (i = 1; i < argc; i++) { |
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106 if (argv[i] == NULL) { |
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107 continue; /* Whack */ |
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108 } |
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109 if (next) { |
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110 *next = argv[i]; |
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111 next = NULL; |
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112 continue; |
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113 } |
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114 |
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115 if (argv[i][0] == '-') { |
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116 switch (argv[i][1]) { |
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117 case 'f': |
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118 next = &filename; |
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119 break; |
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120 case 't': |
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121 next = &typetext; |
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122 break; |
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123 case 's': |
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124 next = &sizetext; |
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125 break; |
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126 case 'y': |
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127 printpub = 1; |
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128 break; |
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129 case 'h': |
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130 printhelp(argv[0]); |
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131 exit(EXIT_SUCCESS); |
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132 break; |
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133 #ifdef DEBUG_TRACE |
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134 case 'v': |
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135 debug_trace = 1; |
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136 break; |
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137 #endif |
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138 default: |
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139 fprintf(stderr, "Unknown argument %s\n", argv[i]); |
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140 printhelp(argv[0]); |
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141 exit(EXIT_FAILURE); |
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142 break; |
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143 } |
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144 } |
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145 } |
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146 |
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147 if (!filename) { |
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148 fprintf(stderr, "Must specify a key filename\n"); |
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149 printhelp(argv[0]); |
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150 exit(EXIT_FAILURE); |
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151 } |
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152 |
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153 if (printpub) { |
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154 justprintpub(filename); |
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155 /* Not reached */ |
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156 } |
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157 |
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158 /* check/parse args */ |
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159 if (!typetext) { |
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160 fprintf(stderr, "Must specify key type\n"); |
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161 printhelp(argv[0]); |
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162 exit(EXIT_FAILURE); |
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163 } |
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164 |
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165 if (strlen(typetext) == 3) { |
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166 #ifdef DROPBEAR_RSA |
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167 if (strncmp(typetext, "rsa", 3) == 0) { |
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168 keytype = DROPBEAR_SIGNKEY_RSA; |
165
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169 TRACE(("type is rsa")) |
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170 } |
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171 #endif |
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172 #ifdef DROPBEAR_DSS |
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173 if (strncmp(typetext, "dss", 3) == 0) { |
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174 keytype = DROPBEAR_SIGNKEY_DSS; |
165
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175 TRACE(("type is dss")) |
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176 } |
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177 #endif |
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178 } |
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179 if (keytype == -1) { |
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180 fprintf(stderr, "Unknown key type '%s'\n", typetext); |
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181 printhelp(argv[0]); |
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182 exit(EXIT_FAILURE); |
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183 } |
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184 |
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185 if (sizetext) { |
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186 if (sscanf(sizetext, "%u", &bits) != 1) { |
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187 fprintf(stderr, "Bits must be an integer\n"); |
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188 exit(EXIT_FAILURE); |
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189 } |
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190 |
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191 if (bits < 512 || bits > 4096 || (bits % 8 != 0)) { |
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192 fprintf(stderr, "Bits must satisfy 512 <= bits <= 4096, and be a" |
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193 " multiple of 8\n"); |
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194 exit(EXIT_FAILURE); |
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195 } |
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196 |
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197 keysize = bits / 8; |
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198 } else { |
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199 if (keytype == DROPBEAR_SIGNKEY_DSS) { |
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200 keysize = DSS_SIZE; |
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201 } else if (keytype == DROPBEAR_SIGNKEY_RSA) { |
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202 keysize = RSA_SIZE; |
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203 } else { |
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204 exit(EXIT_FAILURE); /* not reached */ |
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205 } |
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206 } |
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207 |
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208 |
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209 fprintf(stderr, "Will output %d bit %s secret key to '%s'\n", keysize*8, |
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210 typetext, filename); |
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211 |
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212 /* don't want the file readable by others */ |
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213 umask(077); |
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214 |
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215 /* now we can generate the key */ |
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216 key = new_sign_key(); |
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217 |
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218 fprintf(stderr, "Generating key, this may take a while...\n"); |
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219 switch(keytype) { |
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220 #ifdef DROPBEAR_RSA |
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221 case DROPBEAR_SIGNKEY_RSA: |
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222 key->rsakey = gen_rsa_priv_key(keysize); /* 128 bytes = 1024 bit */ |
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223 break; |
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224 #endif |
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225 #ifdef DROPBEAR_DSS |
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226 case DROPBEAR_SIGNKEY_DSS: |
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227 key->dsskey = gen_dss_priv_key(keysize); /* 128 bytes = 1024 bit */ |
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228 break; |
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229 #endif |
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230 default: |
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231 fprintf(stderr, "Internal error, bad key type\n"); |
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232 exit(EXIT_FAILURE); |
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233 } |
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234 |
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235 buf = buf_new(MAX_PRIVKEY_SIZE); |
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236 |
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237 buf_put_priv_key(buf, key, keytype); |
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238 buf_setpos(buf, 0); |
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239 buf_writefile(buf, filename); |
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240 |
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241 buf_burn(buf); |
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242 buf_free(buf); |
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243 |
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244 printpubkey(key, keytype); |
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245 |
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246 sign_key_free(key); |
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247 |
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248 return EXIT_SUCCESS; |
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249 } |
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250 #endif |
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251 |
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252 static void justprintpub(const char* filename) { |
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253 |
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254 buffer *buf = NULL; |
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255 sign_key *key = NULL; |
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256 int keytype; |
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257 int ret; |
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258 int err = DROPBEAR_FAILURE; |
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259 |
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260 buf = buf_new(MAX_PRIVKEY_SIZE); |
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261 ret = buf_readfile(buf, filename); |
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262 |
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263 if (ret != DROPBEAR_SUCCESS) { |
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264 fprintf(stderr, "Failed reading '%s'\n", filename); |
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265 goto out; |
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266 } |
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267 |
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268 key = new_sign_key(); |
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269 keytype = DROPBEAR_SIGNKEY_ANY; |
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270 |
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271 buf_setpos(buf, 0); |
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272 ret = buf_get_priv_key(buf, key, &keytype); |
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273 if (ret == DROPBEAR_FAILURE) { |
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274 fprintf(stderr, "Bad key in '%s'\n", filename); |
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275 goto out; |
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276 } |
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277 |
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278 printpubkey(key, keytype); |
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279 |
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280 err = DROPBEAR_SUCCESS; |
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281 |
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282 out: |
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283 buf_burn(buf); |
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284 buf_free(buf); |
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285 buf = NULL; |
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286 sign_key_free(key); |
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287 key = NULL; |
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288 exit(err); |
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289 } |
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290 |
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291 static void printpubkey(sign_key * key, int keytype) { |
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292 |
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293 buffer * buf = NULL; |
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294 unsigned char base64key[MAX_PUBKEY_SIZE*2]; |
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295 unsigned long base64len; |
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296 int err; |
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297 const char * typestring = NULL; |
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298 char *fp = NULL; |
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299 int len; |
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300 |
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301 buf = buf_new(MAX_PUBKEY_SIZE); |
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302 buf_put_pub_key(buf, key, keytype); |
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303 buf_setpos(buf, 4); |
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304 |
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305 len = buf->len - buf->pos; |
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306 |
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307 base64len = sizeof(base64key); |
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308 err = base64_encode(buf_getptr(buf, len), len, base64key, &base64len); |
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309 |
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310 if (err != CRYPT_OK) { |
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311 fprintf(stderr, "base64 failed"); |
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312 } |
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313 |
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314 typestring = signkey_name_from_type(keytype, &err); |
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315 |
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316 fp = sign_key_fingerprint(buf_getptr(buf, len), len); |
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317 |
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318 printf("Public key portion is:\n%s %s\nFingerprint: %s\n", |
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319 typestring, base64key, fp); |
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320 |
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321 m_free(fp); |
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322 buf_free(buf); |
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323 } |
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324 |
4
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325 /* Write a buffer to a file specified, failing if the file exists */ |
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326 static void buf_writefile(buffer * buf, const char * filename) { |
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327 |
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328 int fd; |
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329 int len; |
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330 |
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331 fd = open(filename, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR); |
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332 if (fd < 0) { |
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333 fprintf(stderr, "Couldn't create new file %s\n", filename); |
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334 perror("Reason"); |
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335 buf_burn(buf); |
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336 exit(EXIT_FAILURE); |
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337 } |
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338 |
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339 /* write the file now */ |
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340 while (buf->pos != buf->len) { |
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341 len = write(fd, buf_getptr(buf, buf->len - buf->pos), |
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342 buf->len - buf->pos); |
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343 if (errno == EINTR) { |
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344 continue; |
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|
345 } |
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346 if (len <= 0) { |
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347 fprintf(stderr, "Failed writing file '%s'\n",filename); |
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|
348 perror("Reason"); |
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|
349 exit(EXIT_FAILURE); |
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|
350 } |
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|
351 buf_incrpos(buf, len); |
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|
352 } |
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|
353 |
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|
354 close(fd); |
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|
355 } |