Mercurial > dropbear

annotate signkey.c @ 41:18eccbfb9641

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added window-size change handling
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Aug 2004 09:41:37 +0000
parents b4874d772210
children 45edf30ea0a6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 #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 should be set by the caller to specify the type to read, and
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49 * on return is set to the type read (useful when type = _ANY) */
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50 int buf_get_pub_key(buffer *buf, sign_key *key, int *type) {
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51
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52 unsigned char* ident;
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53 unsigned int len;
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54
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55 TRACE(("enter buf_get_pub_key"));
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56
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57 ident = buf_getstring(buf, &len);
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59
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60 #ifdef DROPBEAR_DSS
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61 if (memcmp(ident, SSH_SIGNKEY_DSS, len) == 0
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62 && (*type == DROPBEAR_SIGNKEY_ANY
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63 || *type == DROPBEAR_SIGNKEY_DSS)) {
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64 m_free(ident);
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65 buf_setpos(buf, buf->pos - len - 4);
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66 dss_key_free(key->dsskey);
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67 key->dsskey = (dss_key*)m_malloc(sizeof(dss_key));
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68 *type = DROPBEAR_SIGNKEY_DSS;
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69 return buf_get_dss_pub_key(buf, key->dsskey);
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70 }
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71 #endif
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72 #ifdef DROPBEAR_RSA
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73 if (memcmp(ident, SSH_SIGNKEY_RSA, len) == 0
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74 && (*type == DROPBEAR_SIGNKEY_ANY
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75 || *type == DROPBEAR_SIGNKEY_RSA)) {
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76 m_free(ident);
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77 buf_setpos(buf, buf->pos - len - 4);
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78 rsa_key_free(key->rsakey);
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79 key->rsakey = (rsa_key*)m_malloc(sizeof(rsa_key));
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80 *type = DROPBEAR_SIGNKEY_RSA;
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81 return buf_get_rsa_pub_key(buf, key->rsakey);
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82 }
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83 #endif
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84 TRACE(("leave buf_get_pub_key: didn't match the type we want (%d versus '%s'len %d)", *type, ident, len));
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85
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86 m_free(ident);
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87
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88 return DROPBEAR_FAILURE;
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89
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90 }
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91
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92 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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93 /* type is set to hold the type returned */
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94 int buf_get_priv_key(buffer *buf, sign_key *key, int *type) {
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95
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96 unsigned char* ident;
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97 unsigned int len;
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98 int ret;
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99
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100 TRACE(("enter buf_get_priv_key"));
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101 ident = buf_getstring(buf, &len);
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102
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103 #ifdef DROPBEAR_DSS
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104 if (memcmp(ident, SSH_SIGNKEY_DSS, len) == 0
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105 && (*type == DROPBEAR_SIGNKEY_ANY
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106 || *type == DROPBEAR_SIGNKEY_DSS)) {
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107 m_free(ident);
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108 buf_setpos(buf, buf->pos - len - 4);
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109 dss_key_free(key->dsskey);
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110 key->dsskey = (dss_key*)m_malloc(sizeof(dss_key));
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111 ret = buf_get_dss_priv_key(buf, key->dsskey);
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112 *type = DROPBEAR_SIGNKEY_DSS;
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113 if (ret == DROPBEAR_FAILURE) {
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114 m_free(key->dsskey);
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115 }
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116 TRACE(("leave buf_get_priv_key: done get dss"));
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117 return ret;
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118 }
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119 #endif
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120 #ifdef DROPBEAR_RSA
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121 if (memcmp(ident, SSH_SIGNKEY_RSA, len) == 0
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122 && (*type == DROPBEAR_SIGNKEY_ANY
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123 || *type == DROPBEAR_SIGNKEY_RSA)) {
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124 m_free(ident);
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125 buf_setpos(buf, buf->pos - len - 4);
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126 rsa_key_free(key->rsakey);
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127 key->rsakey = (rsa_key*)m_malloc(sizeof(rsa_key));
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128 ret = buf_get_rsa_priv_key(buf, key->rsakey);
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129 *type = DROPBEAR_SIGNKEY_RSA;
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130 if (ret == DROPBEAR_FAILURE) {
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131 m_free(key->rsakey);
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132 }
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133 TRACE(("leave buf_get_priv_key: done get rsa"));
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134 return ret;
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135 }
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136 #endif
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137
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138 m_free(ident);
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139
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140 TRACE(("leave buf_get_priv_key"));
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141 return DROPBEAR_FAILURE;
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142
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143 }
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144
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145 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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146 void buf_put_pub_key(buffer* buf, sign_key *key, int type) {
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147
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148 buffer *pubkeys;
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149
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150 TRACE(("enter buf_put_pub_key"));
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151 pubkeys = buf_new(1000);
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152
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153 #ifdef DROPBEAR_DSS
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154 if (type == DROPBEAR_SIGNKEY_DSS) {
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155 buf_put_dss_pub_key(pubkeys, key->dsskey);
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156 }
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157 #endif
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158 #ifdef DROPBEAR_RSA
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159 if (type == DROPBEAR_SIGNKEY_RSA) {
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160 buf_put_rsa_pub_key(pubkeys, key->rsakey);
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161 }
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162 #endif
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163 if (pubkeys->len == 0) {
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164 dropbear_exit("bad key types in buf_put_pub_key");
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165 }
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166
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167 buf_setpos(pubkeys, 0);
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168 buf_putstring(buf, buf_getptr(pubkeys, pubkeys->len),
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169 pubkeys->len);
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170
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171 buf_free(pubkeys);
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172 TRACE(("leave buf_put_pub_key"));
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173 }
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174
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175 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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176 void buf_put_priv_key(buffer* buf, sign_key *key, int type) {
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177
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178 TRACE(("enter buf_put_priv_key"));
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179 TRACE(("type is %d", type));
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180
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181 #ifdef DROPBEAR_DSS
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182 if (type == DROPBEAR_SIGNKEY_DSS) {
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183 buf_put_dss_priv_key(buf, key->dsskey);
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184 TRACE(("leave buf_put_priv_key: dss done"));
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185 return;
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186 }
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187 #endif
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188 #ifdef DROPBEAR_RSA
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189 if (type == DROPBEAR_SIGNKEY_RSA) {
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190 buf_put_rsa_priv_key(buf, key->rsakey);
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191 TRACE(("leave buf_put_priv_key: rsa done"));
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192 return;
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193 }
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194 #endif
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195 dropbear_exit("bad key types in put pub key");
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196 }
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197
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198 void sign_key_free(sign_key *key) {
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199
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200 TRACE(("enter sign_key_free"));
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201
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202 #ifdef DROPBEAR_DSS
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203 dss_key_free(key->dsskey);
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204 key->dsskey = NULL;
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205 #endif
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206 #ifdef DROPBEAR_RSA
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207 rsa_key_free(key->rsakey);
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208 key->rsakey = NULL;
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209 #endif
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210
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211 m_free(key);
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212 TRACE(("leave sign_key_free"));
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213 }
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214
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215 static char hexdig(unsigned char x) {
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216
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217 if (x > 0xf)
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218 return 'X';
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219
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220 if (x < 10)
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221 return '0' + x;
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222 else
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223 return 'a' + x - 10;
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224 }
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225
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226 /* Since we're not sure if we'll have md5 or sha1, we present both.
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227 * MD5 is used in preference, but sha1 could still be useful */
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228 #ifdef DROPBEAR_MD5_HMAC
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229 static char * sign_key_md5_fingerprint(sign_key *key, int type) {
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230
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231 char * ret;
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232 hash_state hs;
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233 buffer *pubkeys;
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234 unsigned char hash[MD5_HASH_SIZE];
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235 unsigned int h, i;
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236 unsigned int buflen;
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237
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238 md5_init(&hs);
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239
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240 pubkeys = buf_new(1000);
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241 buf_put_pub_key(pubkeys, key, type);
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242 /* skip the size int of the string - this is a bit messy */
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243 buf_setpos(pubkeys, 4);
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244 md5_process(&hs, buf_getptr(pubkeys, pubkeys->len-pubkeys->pos),
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245 pubkeys->len-pubkeys->pos);
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246
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247 buf_free(pubkeys);
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248 md5_done(&hs, hash);
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249
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250 /* "md5 hexfingerprinthere\0", each hex digit is "AB:" etc */
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251 buflen = 4 + 3*MD5_HASH_SIZE;
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252 ret = (char*)m_malloc(buflen);
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253
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254 memset(ret, 'Z', buflen);
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255 strcpy(ret, "md5 ");
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256
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257 for (i = 4, h = 0; i < buflen; i+=3, h++) {
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258 ret[i] = hexdig(hash[h] >> 4);
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259 ret[i+1] = hexdig(hash[h] & 0x0f);
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260 ret[i+2] = ':';
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261 }
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262 ret[buflen-1] = 0x0;
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263
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264 return ret;
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265 }
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266
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267 #else /* use SHA1 rather than MD5 for fingerprint */
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268 static char * sign_key_sha1_fingerprint(sign_key *key, int type) {
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269
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270 char * ret;
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271 hash_state hs;
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272 buffer *pubkeys;
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273 unsigned char hash[SHA1_HASH_SIZE];
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274 unsigned int h, i;
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275 unsigned int buflen;
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276
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277 sha1_init(&hs);
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278
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279 pubkeys = buf_new(1000);
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280 buf_put_pub_key(pubkeys, key, type);
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281 buf_setpos(pubkeys, 4);
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282 /* skip the size int of the string - this is a bit messy */
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283 sha1_process(&hs, buf_getptr(pubkeys, pubkeys->len-pubkeys->pos),
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284 pubkeys->len-pubkeys->pos);
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285
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286 buf_free(pubkeys);
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287 sha1_done(&hs, hash);
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288
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289 /* "sha1 hexfingerprinthere\0", each hex digit is "AB:" etc */
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290 buflen = 5 + 3*SHA1_HASH_SIZE;
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291 ret = (char*)m_malloc(buflen);
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292
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293 strcpy(ret, "sha1 ");
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294
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295 for (i = 5, h = 0; i < buflen; i+=3, h++) {
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296 ret[i] = hexdig(hash[h] >> 4);
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297 ret[i+1] = hexdig(hash[h] & 0x0f);
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298 ret[i+2] = ':';
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299 }
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300 ret[buflen-1] = 0x0;
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301
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302 return ret;
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303 }
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304
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305 #endif /* MD5/SHA1 switch */
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306
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307 /* This will return a freshly malloced string, containing a fingerprint
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308 * in either sha1 or md5 */
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309 char * sign_key_fingerprint(sign_key *key, int type) {
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310
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311 #ifdef DROPBEAR_MD5_HMAC
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312 return sign_key_md5_fingerprint(key, type);
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313 #else
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314 return sign_key_sha1_fingerprint(key, type);
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315 #endif
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316 }
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317
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318 void buf_put_sign(buffer* buf, sign_key *key, int type,
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319 const unsigned char *data, unsigned int len) {
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320
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321 buffer *sigblob;
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322
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323 sigblob = buf_new(1000);
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324
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325 #ifdef DROPBEAR_DSS
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326 if (type == DROPBEAR_SIGNKEY_DSS) {
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327 buf_put_dss_sign(sigblob, key->dsskey, data, len);
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328 }
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329 #endif
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330 #ifdef DROPBEAR_RSA
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331 if (type == DROPBEAR_SIGNKEY_RSA) {
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332 buf_put_rsa_sign(sigblob, key->rsakey, data, len);
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333 }
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334 #endif
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335 if (sigblob->len == 0) {
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336 dropbear_exit("non-matching signing type");
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337 }
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338
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339 buf_setpos(sigblob, 0);
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340 buf_putstring(buf, buf_getptr(sigblob, sigblob->len),
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341 sigblob->len);
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342
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343 buf_free(sigblob);
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344
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345 }
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346
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347 #ifdef DROPBEAR_SIGNKEY_VERIFY
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348 /* Return DROPBEAR_SUCCESS or DROPBEAR_FAILURE.
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349 * If FAILURE is returned, the position of
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350 * buf is undefined. If SUCCESS is returned, buf will be positioned after the
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351 * signature blob */
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352 int buf_verify(buffer * buf, sign_key *key, const unsigned char *data,
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353 unsigned int len) {
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354
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355 unsigned int bloblen;
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356 unsigned char * ident = NULL;
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357 unsigned int identlen = 0;
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358
34
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359 TRACE(("enter buf_verify"));
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360
4
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361 bloblen = buf_getint(buf);
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362 ident = buf_getstring(buf, &identlen);
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363
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364 #ifdef DROPBEAR_DSS
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365 if (bloblen == DSS_SIGNATURE_SIZE &&
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366 memcmp(ident, SSH_SIGNKEY_DSS, identlen) == 0) {
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367 m_free(ident);
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368 return buf_dss_verify(buf, key->dsskey, data, len);
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369 }
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370 #endif
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371
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372 #ifdef DROPBEAR_RSA
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373 if (memcmp(ident, SSH_SIGNKEY_RSA, identlen) == 0) {
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374 m_free(ident);
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375 return buf_rsa_verify(buf, key->rsakey, data, len);
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376 }
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377 #endif
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378
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379 m_free(ident);
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380 dropbear_exit("non-matching signing type");
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381 return DROPBEAR_FAILURE;
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382 }
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383 #endif /* DROPBEAR_SIGNKEY_VERIFY */