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annotate signkey.c @ 4:fe6bca95afa7

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Makefile.in contains updated files required
author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 02:46:09 +0000
parents
children 0969767bca0d
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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 #include "includes.h"
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26 #include "dbutil.h"
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27 #include "signkey.h"
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28 #include "buffer.h"
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29 #include "ssh.h"
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30
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31 /* malloc a new sign_key and set the dss and rsa keys to NULL */
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32 sign_key * new_sign_key() {
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33
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34 sign_key * ret;
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35
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36 ret = (sign_key*)m_malloc(sizeof(sign_key));
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37 #ifdef DROPBEAR_DSS
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38 ret->dsskey = NULL;
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39 #endif
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40 #ifdef DROPBEAR_RSA
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41 ret->rsakey = NULL;
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42 #endif
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43 return ret;
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44
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45 }
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46
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47 /* returns DROPBEAR_SUCCESS on success, DROPBEAR_FAILURE on fail.
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48 * type is set to hold the type returned */
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49 int buf_get_pub_key(buffer *buf, sign_key *key, int *type) {
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50
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51 unsigned char* ident;
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52 unsigned int len;
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53
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54 ident = buf_getstring(buf, &len);
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55
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56 #ifdef DROPBEAR_DSS
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57 if (memcmp(ident, SSH_SIGNKEY_DSS, len) == 0
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58 && (*type == DROPBEAR_SIGNKEY_ANY
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59 || *type == DROPBEAR_SIGNKEY_DSS)) {
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60 m_free(ident);
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61 buf_setpos(buf, buf->pos - len - 4);
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62 dss_key_free(key->dsskey);
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63 key->dsskey = (dss_key*)m_malloc(sizeof(dss_key));
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64 *type = DROPBEAR_SIGNKEY_DSS;
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65 return buf_get_dss_pub_key(buf, key->dsskey);
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66 }
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67 #endif
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68 #ifdef DROPBEAR_RSA
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69 if (memcmp(ident, SSH_SIGNKEY_RSA, len) == 0
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70 && (*type == DROPBEAR_SIGNKEY_ANY
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71 || *type == DROPBEAR_SIGNKEY_RSA)) {
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72 m_free(ident);
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73 buf_setpos(buf, buf->pos - len - 4);
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74 rsa_key_free(key->rsakey);
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75 key->rsakey = (rsa_key*)m_malloc(sizeof(rsa_key));
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76 *type = DROPBEAR_SIGNKEY_RSA;
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77 return buf_get_rsa_pub_key(buf, key->rsakey);
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78 }
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79 #endif
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80
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81 m_free(ident);
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82
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83 return DROPBEAR_FAILURE;
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84
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85 }
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86
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87 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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88 /* type is set to hold the type returned */
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89 int buf_get_priv_key(buffer *buf, sign_key *key, int *type) {
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90
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91 unsigned char* ident;
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92 unsigned int len;
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93 int ret;
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94
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95 TRACE(("enter buf_get_priv_key"));
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96 ident = buf_getstring(buf, &len);
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97
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98 #ifdef DROPBEAR_DSS
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99 if (memcmp(ident, SSH_SIGNKEY_DSS, len) == 0
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100 && (*type == DROPBEAR_SIGNKEY_ANY
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101 || *type == DROPBEAR_SIGNKEY_DSS)) {
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102 m_free(ident);
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103 buf_setpos(buf, buf->pos - len - 4);
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104 dss_key_free(key->dsskey);
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105 key->dsskey = (dss_key*)m_malloc(sizeof(dss_key));
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106 ret = buf_get_dss_priv_key(buf, key->dsskey);
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107 *type = DROPBEAR_SIGNKEY_DSS;
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108 if (ret == DROPBEAR_FAILURE) {
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109 m_free(key->dsskey);
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110 }
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111 TRACE(("leave buf_get_priv_key: done get dss"));
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112 return ret;
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113 }
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114 #endif
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115 #ifdef DROPBEAR_RSA
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116 if (memcmp(ident, SSH_SIGNKEY_RSA, len) == 0
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117 && (*type == DROPBEAR_SIGNKEY_ANY
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118 || *type == DROPBEAR_SIGNKEY_RSA)) {
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119 m_free(ident);
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120 buf_setpos(buf, buf->pos - len - 4);
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121 rsa_key_free(key->rsakey);
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122 key->rsakey = (rsa_key*)m_malloc(sizeof(rsa_key));
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123 ret = buf_get_rsa_priv_key(buf, key->rsakey);
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124 *type = DROPBEAR_SIGNKEY_RSA;
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125 if (ret == DROPBEAR_FAILURE) {
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126 m_free(key->rsakey);
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127 }
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128 TRACE(("leave buf_get_priv_key: done get rsa"));
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129 return ret;
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130 }
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131 #endif
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132
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133 m_free(ident);
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134
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135 TRACE(("leave buf_get_priv_key"));
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136 return DROPBEAR_FAILURE;
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137
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138 }
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139
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140 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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141 void buf_put_pub_key(buffer* buf, sign_key *key, int type) {
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142
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143 buffer *pubkeys;
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144
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145 TRACE(("enter buf_put_pub_key"));
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146 pubkeys = buf_new(1000);
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147
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148 #ifdef DROPBEAR_DSS
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149 if (type == DROPBEAR_SIGNKEY_DSS) {
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150 buf_put_dss_pub_key(pubkeys, key->dsskey);
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151 }
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152 #endif
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153 #ifdef DROPBEAR_RSA
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154 if (type == DROPBEAR_SIGNKEY_RSA) {
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155 buf_put_rsa_pub_key(pubkeys, key->rsakey);
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156 }
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157 #endif
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158 if (pubkeys->len == 0) {
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159 dropbear_exit("bad key types in buf_put_pub_key");
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160 }
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161
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162 buf_setpos(pubkeys, 0);
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163 buf_putstring(buf, buf_getptr(pubkeys, pubkeys->len),
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164 pubkeys->len);
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165
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166 buf_free(pubkeys);
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167 TRACE(("leave buf_put_pub_key"));
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168 }
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169
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170 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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171 void buf_put_priv_key(buffer* buf, sign_key *key, int type) {
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172
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173 TRACE(("enter buf_put_priv_key"));
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174 TRACE(("type is %d", type));
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175
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176 #ifdef DROPBEAR_DSS
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177 if (type == DROPBEAR_SIGNKEY_DSS) {
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178 buf_put_dss_priv_key(buf, key->dsskey);
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179 TRACE(("leave buf_put_priv_key: dss done"));
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180 return;
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181 }
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182 #endif
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183 #ifdef DROPBEAR_RSA
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184 if (type == DROPBEAR_SIGNKEY_RSA) {
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185 buf_put_rsa_priv_key(buf, key->rsakey);
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186 TRACE(("leave buf_put_priv_key: rsa done"));
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187 return;
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188 }
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189 #endif
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190 dropbear_exit("bad key types in put pub key");
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191 }
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192
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193 void sign_key_free(sign_key *key) {
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194
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195 TRACE(("enter sign_key_free"));
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196
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197 #ifdef DROPBEAR_DSS
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198 dss_key_free(key->dsskey);
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199 key->dsskey = NULL;
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200 #endif
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201 #ifdef DROPBEAR_RSA
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202 rsa_key_free(key->rsakey);
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203 key->rsakey = NULL;
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204 #endif
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205
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206 m_free(key);
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207 TRACE(("leave sign_key_free"));
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208 }
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209
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210 static char hexdig(unsigned char x) {
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211
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212 if (x > 0xf)
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213 return 'X';
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214
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215 if (x < 10)
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216 return '0' + x;
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217 else
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218 return 'a' + x - 10;
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219 }
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220
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221 /* Since we're not sure if we'll have md5 or sha1, we present both.
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222 * MD5 is used in preference, but sha1 could still be useful */
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223 #ifdef DROPBEAR_MD5_HMAC
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224 static char * sign_key_md5_fingerprint(sign_key *key, int type) {
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225
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226 char * ret;
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227 hash_state hs;
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228 buffer *pubkeys;
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229 unsigned char hash[MD5_HASH_SIZE];
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230 unsigned int h, i;
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231 unsigned int buflen;
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232
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233 md5_init(&hs);
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234
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235 pubkeys = buf_new(1000);
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236 buf_put_pub_key(pubkeys, key, type);
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237 /* skip the size int of the string - this is a bit messy */
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238 buf_setpos(pubkeys, 4);
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239 md5_process(&hs, buf_getptr(pubkeys, pubkeys->len-pubkeys->pos),
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240 pubkeys->len-pubkeys->pos);
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241
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242 buf_free(pubkeys);
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243 md5_done(&hs, hash);
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244
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245 /* "md5 hexfingerprinthere\0", each hex digit is "AB:" etc */
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246 buflen = 4 + 3*MD5_HASH_SIZE;
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247 ret = (char*)m_malloc(buflen);
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248
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249 memset(ret, 'Z', buflen);
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250 strcpy(ret, "md5 ");
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251
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252 for (i = 4, h = 0; i < buflen; i+=3, h++) {
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253 ret[i] = hexdig(hash[h] >> 4);
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254 ret[i+1] = hexdig(hash[h] & 0x0f);
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255 ret[i+2] = ':';
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256 }
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257 ret[buflen-1] = 0x0;
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258
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259 return ret;
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260 }
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261
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262 #else /* use SHA1 rather than MD5 for fingerprint */
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263 static char * sign_key_sha1_fingerprint(sign_key *key, int type) {
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264
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265 char * ret;
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266 hash_state hs;
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267 buffer *pubkeys;
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268 unsigned char hash[SHA1_HASH_SIZE];
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269 unsigned int h, i;
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270 unsigned int buflen;
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271
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272 sha1_init(&hs);
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273
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274 pubkeys = buf_new(1000);
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275 buf_put_pub_key(pubkeys, key, type);
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276 buf_setpos(pubkeys, 4);
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277 /* skip the size int of the string - this is a bit messy */
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278 sha1_process(&hs, buf_getptr(pubkeys, pubkeys->len-pubkeys->pos),
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279 pubkeys->len-pubkeys->pos);
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280
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281 buf_free(pubkeys);
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282 sha1_done(&hs, hash);
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283
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284 /* "sha1 hexfingerprinthere\0", each hex digit is "AB:" etc */
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285 buflen = 5 + 3*SHA1_HASH_SIZE;
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286 ret = (char*)m_malloc(buflen);
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287
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288 strcpy(ret, "sha1 ");
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289
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290 for (i = 5, h = 0; i < buflen; i+=3, h++) {
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291 ret[i] = hexdig(hash[h] >> 4);
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292 ret[i+1] = hexdig(hash[h] & 0x0f);
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293 ret[i+2] = ':';
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294 }
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295 ret[buflen-1] = 0x0;
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296
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297 return ret;
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298 }
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299
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300 #endif /* MD5/SHA1 switch */
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301
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302 /* This will return a freshly malloced string, containing a fingerprint
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303 * in either sha1 or md5 */
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304 char * sign_key_fingerprint(sign_key *key, int type) {
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305
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306 #ifdef DROPBEAR_MD5_HMAC
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307 return sign_key_md5_fingerprint(key, type);
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308 #else
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309 return sign_key_sha1_fingerprint(key, type);
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310 #endif
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311 }
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312
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313 void buf_put_sign(buffer* buf, sign_key *key, int type,
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314 const unsigned char *data, unsigned int len) {
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315
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316 buffer *sigblob;
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317
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318 sigblob = buf_new(1000);
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319
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320 #ifdef DROPBEAR_DSS
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321 if (type == DROPBEAR_SIGNKEY_DSS) {
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322 buf_put_dss_sign(sigblob, key->dsskey, data, len);
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323 }
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324 #endif
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325 #ifdef DROPBEAR_RSA
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326 if (type == DROPBEAR_SIGNKEY_RSA) {
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327 buf_put_rsa_sign(sigblob, key->rsakey, data, len);
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328 }
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329 #endif
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330 if (sigblob->len == 0) {
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331 dropbear_exit("non-matching signing type");
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332 }
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333
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334 buf_setpos(sigblob, 0);
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335 buf_putstring(buf, buf_getptr(sigblob, sigblob->len),
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336 sigblob->len);
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337
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338 buf_free(sigblob);
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339
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340 }
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341
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342 #ifdef DROPBEAR_SIGNKEY_VERIFY
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343 /* Return DROPBEAR_SUCCESS or DROPBEAR_FAILURE.
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344 * If FAILURE is returned, the position of
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345 * buf is undefined. If SUCCESS is returned, buf will be positioned after the
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346 * signature blob */
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347 int buf_verify(buffer * buf, sign_key *key, const unsigned char *data,
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348 unsigned int len) {
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349
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350 unsigned int bloblen;
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351 unsigned char * ident = NULL;
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352 unsigned int identlen = 0;
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353
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354 bloblen = buf_getint(buf);
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355 ident = buf_getstring(buf, &identlen);
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356
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357 #ifdef DROPBEAR_DSS
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358 if (bloblen == DSS_SIGNATURE_SIZE &&
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359 memcmp(ident, SSH_SIGNKEY_DSS, identlen) == 0) {
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360 m_free(ident);
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361 return buf_dss_verify(buf, key->dsskey, data, len);
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362 }
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363 #endif
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364
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365 #ifdef DROPBEAR_RSA
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366 if (memcmp(ident, SSH_SIGNKEY_RSA, identlen) == 0) {
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367 m_free(ident);
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368 return buf_rsa_verify(buf, key->rsakey, data, len);
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369 }
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370 #endif
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371
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372 m_free(ident);
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373 dropbear_exit("non-matching signing type");
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374 return DROPBEAR_FAILURE;
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375 }
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376 #endif /* DROPBEAR_SIGNKEY_VERIFY */