Mercurial > dropbear
annotate signkey.c @ 34:e2a1eaa19f22
Client mostly works up to password auth
Need to rework algo-choosing etc, since server is now broken.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 28 Jul 2004 16:44:16 +0000 |
parents | 0969767bca0d |
children | b4874d772210 |
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. |
26 | 48 * type should be set by the caller to specify the type to read, and |
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 printhex(buf_getptr(buf, 0x99), 0x99); |
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57 |
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58 ident = buf_getstring(buf, &len); |
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59 |
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60 |
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61 #ifdef DROPBEAR_DSS |
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62 if (memcmp(ident, SSH_SIGNKEY_DSS, len) == 0 |
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63 && (*type == DROPBEAR_SIGNKEY_ANY |
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64 || *type == DROPBEAR_SIGNKEY_DSS)) { |
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65 m_free(ident); |
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66 buf_setpos(buf, buf->pos - len - 4); |
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67 dss_key_free(key->dsskey); |
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68 key->dsskey = (dss_key*)m_malloc(sizeof(dss_key)); |
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69 *type = DROPBEAR_SIGNKEY_DSS; |
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70 return buf_get_dss_pub_key(buf, key->dsskey); |
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71 } |
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72 #endif |
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73 #ifdef DROPBEAR_RSA |
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74 if (memcmp(ident, SSH_SIGNKEY_RSA, len) == 0 |
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75 && (*type == DROPBEAR_SIGNKEY_ANY |
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76 || *type == DROPBEAR_SIGNKEY_RSA)) { |
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77 m_free(ident); |
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78 buf_setpos(buf, buf->pos - len - 4); |
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79 rsa_key_free(key->rsakey); |
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80 key->rsakey = (rsa_key*)m_malloc(sizeof(rsa_key)); |
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81 *type = DROPBEAR_SIGNKEY_RSA; |
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82 return buf_get_rsa_pub_key(buf, key->rsakey); |
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83 } |
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84 #endif |
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85 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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86 |
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87 m_free(ident); |
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88 |
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89 return DROPBEAR_FAILURE; |
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90 |
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91 } |
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92 |
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93 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
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94 /* type is set to hold the type returned */ |
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95 int buf_get_priv_key(buffer *buf, sign_key *key, int *type) { |
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96 |
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97 unsigned char* ident; |
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98 unsigned int len; |
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99 int ret; |
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100 |
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101 TRACE(("enter buf_get_priv_key")); |
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102 ident = buf_getstring(buf, &len); |
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103 |
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104 #ifdef DROPBEAR_DSS |
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105 if (memcmp(ident, SSH_SIGNKEY_DSS, len) == 0 |
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106 && (*type == DROPBEAR_SIGNKEY_ANY |
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107 || *type == DROPBEAR_SIGNKEY_DSS)) { |
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108 m_free(ident); |
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109 buf_setpos(buf, buf->pos - len - 4); |
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110 dss_key_free(key->dsskey); |
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111 key->dsskey = (dss_key*)m_malloc(sizeof(dss_key)); |
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112 ret = buf_get_dss_priv_key(buf, key->dsskey); |
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113 *type = DROPBEAR_SIGNKEY_DSS; |
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114 if (ret == DROPBEAR_FAILURE) { |
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115 m_free(key->dsskey); |
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116 } |
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117 TRACE(("leave buf_get_priv_key: done get dss")); |
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118 return ret; |
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119 } |
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120 #endif |
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121 #ifdef DROPBEAR_RSA |
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122 if (memcmp(ident, SSH_SIGNKEY_RSA, len) == 0 |
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123 && (*type == DROPBEAR_SIGNKEY_ANY |
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124 || *type == DROPBEAR_SIGNKEY_RSA)) { |
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125 m_free(ident); |
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126 buf_setpos(buf, buf->pos - len - 4); |
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127 rsa_key_free(key->rsakey); |
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128 key->rsakey = (rsa_key*)m_malloc(sizeof(rsa_key)); |
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129 ret = buf_get_rsa_priv_key(buf, key->rsakey); |
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130 *type = DROPBEAR_SIGNKEY_RSA; |
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131 if (ret == DROPBEAR_FAILURE) { |
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132 m_free(key->rsakey); |
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133 } |
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134 TRACE(("leave buf_get_priv_key: done get rsa")); |
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135 return ret; |
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136 } |
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137 #endif |
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138 |
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139 m_free(ident); |
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140 |
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141 TRACE(("leave buf_get_priv_key")); |
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142 return DROPBEAR_FAILURE; |
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143 |
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144 } |
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145 |
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146 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */ |
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147 void buf_put_pub_key(buffer* buf, sign_key *key, int type) { |
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148 |
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149 buffer *pubkeys; |
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150 |
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151 TRACE(("enter buf_put_pub_key")); |
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152 pubkeys = buf_new(1000); |
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153 |
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154 #ifdef DROPBEAR_DSS |
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155 if (type == DROPBEAR_SIGNKEY_DSS) { |
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156 buf_put_dss_pub_key(pubkeys, key->dsskey); |
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157 } |
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158 #endif |
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159 #ifdef DROPBEAR_RSA |
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160 if (type == DROPBEAR_SIGNKEY_RSA) { |
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161 buf_put_rsa_pub_key(pubkeys, key->rsakey); |
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162 } |
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163 #endif |
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164 if (pubkeys->len == 0) { |
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165 dropbear_exit("bad key types in buf_put_pub_key"); |
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166 } |
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167 |
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168 buf_setpos(pubkeys, 0); |
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169 buf_putstring(buf, buf_getptr(pubkeys, pubkeys->len), |
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170 pubkeys->len); |
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171 |
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172 buf_free(pubkeys); |
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173 TRACE(("leave buf_put_pub_key")); |
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174 } |
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175 |
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176 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */ |
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177 void buf_put_priv_key(buffer* buf, sign_key *key, int type) { |
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178 |
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179 TRACE(("enter buf_put_priv_key")); |
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180 TRACE(("type is %d", type)); |
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181 |
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182 #ifdef DROPBEAR_DSS |
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183 if (type == DROPBEAR_SIGNKEY_DSS) { |
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184 buf_put_dss_priv_key(buf, key->dsskey); |
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185 TRACE(("leave buf_put_priv_key: dss done")); |
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186 return; |
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187 } |
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188 #endif |
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189 #ifdef DROPBEAR_RSA |
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190 if (type == DROPBEAR_SIGNKEY_RSA) { |
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191 buf_put_rsa_priv_key(buf, key->rsakey); |
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192 TRACE(("leave buf_put_priv_key: rsa done")); |
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193 return; |
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194 } |
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195 #endif |
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196 dropbear_exit("bad key types in put pub key"); |
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197 } |
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198 |
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199 void sign_key_free(sign_key *key) { |
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200 |
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201 TRACE(("enter sign_key_free")); |
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202 |
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203 #ifdef DROPBEAR_DSS |
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204 dss_key_free(key->dsskey); |
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205 key->dsskey = NULL; |
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206 #endif |
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207 #ifdef DROPBEAR_RSA |
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208 rsa_key_free(key->rsakey); |
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209 key->rsakey = NULL; |
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210 #endif |
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211 |
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212 m_free(key); |
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213 TRACE(("leave sign_key_free")); |
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214 } |
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215 |
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216 static char hexdig(unsigned char x) { |
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217 |
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218 if (x > 0xf) |
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219 return 'X'; |
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220 |
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221 if (x < 10) |
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222 return '0' + x; |
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223 else |
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224 return 'a' + x - 10; |
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225 } |
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226 |
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227 /* Since we're not sure if we'll have md5 or sha1, we present both. |
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228 * MD5 is used in preference, but sha1 could still be useful */ |
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229 #ifdef DROPBEAR_MD5_HMAC |
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230 static char * sign_key_md5_fingerprint(sign_key *key, int type) { |
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231 |
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232 char * ret; |
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233 hash_state hs; |
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234 buffer *pubkeys; |
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235 unsigned char hash[MD5_HASH_SIZE]; |
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236 unsigned int h, i; |
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237 unsigned int buflen; |
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238 |
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239 md5_init(&hs); |
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240 |
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241 pubkeys = buf_new(1000); |
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242 buf_put_pub_key(pubkeys, key, type); |
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243 /* skip the size int of the string - this is a bit messy */ |
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244 buf_setpos(pubkeys, 4); |
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245 md5_process(&hs, buf_getptr(pubkeys, pubkeys->len-pubkeys->pos), |
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246 pubkeys->len-pubkeys->pos); |
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247 |
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248 buf_free(pubkeys); |
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249 md5_done(&hs, hash); |
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250 |
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251 /* "md5 hexfingerprinthere\0", each hex digit is "AB:" etc */ |
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252 buflen = 4 + 3*MD5_HASH_SIZE; |
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253 ret = (char*)m_malloc(buflen); |
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254 |
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255 memset(ret, 'Z', buflen); |
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256 strcpy(ret, "md5 "); |
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257 |
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258 for (i = 4, h = 0; i < buflen; i+=3, h++) { |
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259 ret[i] = hexdig(hash[h] >> 4); |
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260 ret[i+1] = hexdig(hash[h] & 0x0f); |
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261 ret[i+2] = ':'; |
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262 } |
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263 ret[buflen-1] = 0x0; |
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264 |
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265 return ret; |
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266 } |
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267 |
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268 #else /* use SHA1 rather than MD5 for fingerprint */ |
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269 static char * sign_key_sha1_fingerprint(sign_key *key, int type) { |
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270 |
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271 char * ret; |
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272 hash_state hs; |
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273 buffer *pubkeys; |
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274 unsigned char hash[SHA1_HASH_SIZE]; |
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275 unsigned int h, i; |
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276 unsigned int buflen; |
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277 |
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278 sha1_init(&hs); |
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279 |
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280 pubkeys = buf_new(1000); |
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281 buf_put_pub_key(pubkeys, key, type); |
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282 buf_setpos(pubkeys, 4); |
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283 /* skip the size int of the string - this is a bit messy */ |
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284 sha1_process(&hs, buf_getptr(pubkeys, pubkeys->len-pubkeys->pos), |
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285 pubkeys->len-pubkeys->pos); |
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286 |
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287 buf_free(pubkeys); |
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288 sha1_done(&hs, hash); |
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289 |
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290 /* "sha1 hexfingerprinthere\0", each hex digit is "AB:" etc */ |
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291 buflen = 5 + 3*SHA1_HASH_SIZE; |
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292 ret = (char*)m_malloc(buflen); |
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293 |
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294 strcpy(ret, "sha1 "); |
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295 |
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296 for (i = 5, h = 0; i < buflen; i+=3, h++) { |
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297 ret[i] = hexdig(hash[h] >> 4); |
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298 ret[i+1] = hexdig(hash[h] & 0x0f); |
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299 ret[i+2] = ':'; |
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300 } |
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301 ret[buflen-1] = 0x0; |
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302 |
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303 return ret; |
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304 } |
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305 |
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306 #endif /* MD5/SHA1 switch */ |
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307 |
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308 /* This will return a freshly malloced string, containing a fingerprint |
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309 * in either sha1 or md5 */ |
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310 char * sign_key_fingerprint(sign_key *key, int type) { |
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311 |
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312 #ifdef DROPBEAR_MD5_HMAC |
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313 return sign_key_md5_fingerprint(key, type); |
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314 #else |
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315 return sign_key_sha1_fingerprint(key, type); |
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316 #endif |
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317 } |
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318 |
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319 void buf_put_sign(buffer* buf, sign_key *key, int type, |
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320 const unsigned char *data, unsigned int len) { |
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321 |
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322 buffer *sigblob; |
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323 |
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324 sigblob = buf_new(1000); |
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325 |
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326 #ifdef DROPBEAR_DSS |
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327 if (type == DROPBEAR_SIGNKEY_DSS) { |
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328 buf_put_dss_sign(sigblob, key->dsskey, data, len); |
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329 } |
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330 #endif |
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331 #ifdef DROPBEAR_RSA |
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332 if (type == DROPBEAR_SIGNKEY_RSA) { |
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333 buf_put_rsa_sign(sigblob, key->rsakey, data, len); |
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334 } |
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335 #endif |
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336 if (sigblob->len == 0) { |
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337 dropbear_exit("non-matching signing type"); |
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338 } |
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339 |
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340 buf_setpos(sigblob, 0); |
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341 buf_putstring(buf, buf_getptr(sigblob, sigblob->len), |
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342 sigblob->len); |
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343 |
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344 buf_free(sigblob); |
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345 |
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346 } |
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347 |
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348 #ifdef DROPBEAR_SIGNKEY_VERIFY |
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349 /* Return DROPBEAR_SUCCESS or DROPBEAR_FAILURE. |
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350 * If FAILURE is returned, the position of |
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351 * buf is undefined. If SUCCESS is returned, buf will be positioned after the |
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352 * signature blob */ |
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353 int buf_verify(buffer * buf, sign_key *key, const unsigned char *data, |
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354 unsigned int len) { |
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355 |
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356 unsigned int bloblen; |
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357 unsigned char * ident = NULL; |
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358 unsigned int identlen = 0; |
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359 |
34
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360 TRACE(("enter buf_verify")); |
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361 |
4
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362 bloblen = buf_getint(buf); |
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363 ident = buf_getstring(buf, &identlen); |
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364 |
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365 #ifdef DROPBEAR_DSS |
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366 if (bloblen == DSS_SIGNATURE_SIZE && |
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367 memcmp(ident, SSH_SIGNKEY_DSS, identlen) == 0) { |
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368 m_free(ident); |
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369 return buf_dss_verify(buf, key->dsskey, data, len); |
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370 } |
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371 #endif |
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372 |
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373 #ifdef DROPBEAR_RSA |
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374 if (memcmp(ident, SSH_SIGNKEY_RSA, identlen) == 0) { |
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375 m_free(ident); |
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376 return buf_rsa_verify(buf, key->rsakey, data, len); |
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377 } |
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378 #endif |
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379 |
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380 m_free(ident); |
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381 dropbear_exit("non-matching signing type"); |
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382 return DROPBEAR_FAILURE; |
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383 } |
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384 #endif /* DROPBEAR_SIGNKEY_VERIFY */ |