annotate signkey.c @ 107:d3eb1fa8484e

Nasty.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 24 Aug 2004 18:12:18 +0000
parents b0316ce64e4b
children 0cfba3034be5
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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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34 sign_key * ret;
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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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45 }
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47 /* Returns "ssh-dss" or "ssh-rsa" corresponding to the type. Exits fatally
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48 * if the type is invalid */
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49 const char* signkey_name_from_type(int type, int *namelen) {
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50
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51 #ifdef DROPBEAR_RSA
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52 if (type == DROPBEAR_SIGNKEY_RSA) {
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53 *namelen = SSH_SIGNKEY_RSA_LEN;
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54 return SSH_SIGNKEY_RSA;
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55 }
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56 #endif
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57 #ifdef DROPBEAR_DSS
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58 if (type == DROPBEAR_SIGNKEY_DSS) {
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59 *namelen = SSH_SIGNKEY_DSS_LEN;
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60 return SSH_SIGNKEY_DSS;
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61 }
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62 #endif
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63 dropbear_exit("bad key type %d", type);
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64 return NULL; /* notreached */
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65 }
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66
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67 /* Returns DROPBEAR_SIGNKEY_RSA, DROPBEAR_SIGNKEY_DSS,
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68 * or DROPBEAR_SIGNKEY_NONE */
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69 int signkey_type_from_name(const char* name, int namelen) {
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70
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71 #ifdef DROPBEAR_RSA
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72 if (namelen == SSH_SIGNKEY_RSA_LEN
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73 && memcmp(name, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN) == 0) {
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74 return DROPBEAR_SIGNKEY_RSA;
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75 }
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76 #endif
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77 #ifdef DROPBEAR_DSS
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78 if (namelen == SSH_SIGNKEY_DSS_LEN
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79 && memcmp(name, SSH_SIGNKEY_DSS, SSH_SIGNKEY_DSS_LEN) == 0) {
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80 return DROPBEAR_SIGNKEY_DSS;
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81 }
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82 #endif
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83
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84 return DROPBEAR_SIGNKEY_NONE;
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85 }
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86
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87 /* returns DROPBEAR_SUCCESS on success, DROPBEAR_FAILURE on fail.
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88 * type should be set by the caller to specify the type to read, and
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89 * on return is set to the type read (useful when type = _ANY) */
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90 int buf_get_pub_key(buffer *buf, sign_key *key, int *type) {
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91
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92 unsigned char* ident;
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93 unsigned int len;
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94 int keytype;
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95 int ret = DROPBEAR_FAILURE;
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96
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97 TRACE(("enter buf_get_pub_key"));
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98
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99 ident = buf_getstring(buf, &len);
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100 keytype = signkey_type_from_name(ident, len);
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101 m_free(ident);
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102
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103 if (*type != DROPBEAR_SIGNKEY_ANY && *type != keytype) {
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104 return DROPBEAR_FAILURE;
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105 }
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106
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107 *type = keytype;
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108
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109 /* Rewind the buffer back before "ssh-rsa" etc */
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110 buf_incrpos(buf, -len - 4);
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111
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112 #ifdef DROPBEAR_DSS
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113 if (keytype == DROPBEAR_SIGNKEY_DSS) {
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114 dss_key_free(key->dsskey);
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115 key->dsskey = (dss_key*)m_malloc(sizeof(dss_key));
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116 ret = buf_get_dss_pub_key(buf, key->dsskey);
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117 if (ret == DROPBEAR_FAILURE) {
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118 m_free(key->dsskey);
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119 }
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120 }
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121 #endif
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122 #ifdef DROPBEAR_RSA
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123 if (keytype == DROPBEAR_SIGNKEY_RSA) {
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124 rsa_key_free(key->rsakey);
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125 key->rsakey = (rsa_key*)m_malloc(sizeof(rsa_key));
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126 ret = buf_get_rsa_pub_key(buf, key->rsakey);
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127 if (ret == DROPBEAR_FAILURE) {
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128 m_free(key->rsakey);
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129 }
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130 }
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131 #endif
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132
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133 TRACE(("leave buf_get_pub_key"));
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134
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135 return ret;
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136
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137 }
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138
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139 /* returns DROPBEAR_SUCCESS on success, DROPBEAR_FAILURE on fail.
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140 * type should be set by the caller to specify the type to read, and
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141 * on return is set to the type read (useful when type = _ANY) */
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142 int buf_get_priv_key(buffer *buf, sign_key *key, int *type) {
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143
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144 unsigned char* ident;
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145 unsigned int len;
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146 int keytype;
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147 int ret = DROPBEAR_FAILURE;
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148
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149 TRACE(("enter buf_get_priv_key"));
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150
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151 ident = buf_getstring(buf, &len);
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152 keytype = signkey_type_from_name(ident, len);
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153 m_free(ident);
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154
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155 if (*type != DROPBEAR_SIGNKEY_ANY && *type != keytype) {
107
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156 TRACE(("wrong key type: %d %d", *type, keytype));
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157 return DROPBEAR_FAILURE;
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158 }
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159
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160 *type = keytype;
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161
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162 /* Rewind the buffer back before "ssh-rsa" etc */
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163 buf_incrpos(buf, -len - 4);
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164
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165 #ifdef DROPBEAR_DSS
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166 if (keytype == DROPBEAR_SIGNKEY_DSS) {
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167 dss_key_free(key->dsskey);
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168 key->dsskey = (dss_key*)m_malloc(sizeof(dss_key));
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169 ret = buf_get_dss_priv_key(buf, key->dsskey);
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170 if (ret == DROPBEAR_FAILURE) {
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171 m_free(key->dsskey);
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172 }
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173 }
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174 #endif
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175 #ifdef DROPBEAR_RSA
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176 if (keytype == DROPBEAR_SIGNKEY_RSA) {
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177 rsa_key_free(key->rsakey);
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178 key->rsakey = (rsa_key*)m_malloc(sizeof(rsa_key));
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179 ret = buf_get_rsa_priv_key(buf, key->rsakey);
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180 if (ret == DROPBEAR_FAILURE) {
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181 m_free(key->rsakey);
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182 }
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183 }
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184 #endif
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185
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186 TRACE(("leave buf_get_priv_key"));
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187
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188 return ret;
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189
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190 }
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191
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192 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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193 void buf_put_pub_key(buffer* buf, sign_key *key, int type) {
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194
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195 buffer *pubkeys;
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196
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197 TRACE(("enter buf_put_pub_key"));
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198 pubkeys = buf_new(MAX_PUBKEY_SIZE);
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199
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200 #ifdef DROPBEAR_DSS
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201 if (type == DROPBEAR_SIGNKEY_DSS) {
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202 buf_put_dss_pub_key(pubkeys, key->dsskey);
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203 }
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204 #endif
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205 #ifdef DROPBEAR_RSA
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206 if (type == DROPBEAR_SIGNKEY_RSA) {
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207 buf_put_rsa_pub_key(pubkeys, key->rsakey);
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208 }
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209 #endif
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210 if (pubkeys->len == 0) {
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211 dropbear_exit("bad key types in buf_put_pub_key");
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212 }
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213
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214 buf_setpos(pubkeys, 0);
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215 buf_putstring(buf, buf_getptr(pubkeys, pubkeys->len),
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216 pubkeys->len);
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217
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218 buf_free(pubkeys);
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219 TRACE(("leave buf_put_pub_key"));
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220 }
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221
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222 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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223 void buf_put_priv_key(buffer* buf, sign_key *key, int type) {
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224
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225 TRACE(("enter buf_put_priv_key"));
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226 TRACE(("type is %d", type));
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227
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228 #ifdef DROPBEAR_DSS
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229 if (type == DROPBEAR_SIGNKEY_DSS) {
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230 buf_put_dss_priv_key(buf, key->dsskey);
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231 TRACE(("leave buf_put_priv_key: dss done"));
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232 return;
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233 }
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234 #endif
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235 #ifdef DROPBEAR_RSA
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236 if (type == DROPBEAR_SIGNKEY_RSA) {
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237 buf_put_rsa_priv_key(buf, key->rsakey);
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238 TRACE(("leave buf_put_priv_key: rsa done"));
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239 return;
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240 }
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241 #endif
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242 dropbear_exit("bad key types in put pub key");
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243 }
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244
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245 void sign_key_free(sign_key *key) {
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246
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247 TRACE(("enter sign_key_free"));
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248
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249 #ifdef DROPBEAR_DSS
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250 dss_key_free(key->dsskey);
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251 key->dsskey = NULL;
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252 #endif
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253 #ifdef DROPBEAR_RSA
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254 rsa_key_free(key->rsakey);
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255 key->rsakey = NULL;
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256 #endif
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257
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258 m_free(key);
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259 TRACE(("leave sign_key_free"));
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260 }
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261
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262 static char hexdig(unsigned char x) {
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263
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264 if (x > 0xf)
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265 return 'X';
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266
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267 if (x < 10)
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268 return '0' + x;
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269 else
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270 return 'a' + x - 10;
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271 }
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272
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273 /* Since we're not sure if we'll have md5 or sha1, we present both.
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274 * MD5 is used in preference, but sha1 could still be useful */
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275 #ifdef DROPBEAR_MD5_HMAC
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diff changeset
276 static char * sign_key_md5_fingerprint(unsigned char* keyblob,
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diff changeset
277 unsigned int keybloblen) {
4
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278
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279 char * ret;
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280 hash_state hs;
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281 unsigned char hash[MD5_HASH_SIZE];
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282 unsigned int h, i;
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283 unsigned int buflen;
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284
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285 md5_init(&hs);
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286
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287 /* skip the size int of the string - this is a bit messy */
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288 md5_process(&hs, keyblob, keybloblen);
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289
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290 md5_done(&hs, hash);
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291
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292 /* "md5 hexfingerprinthere\0", each hex digit is "AB:" etc */
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293 buflen = 4 + 3*MD5_HASH_SIZE;
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294 ret = (char*)m_malloc(buflen);
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295
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296 memset(ret, 'Z', buflen);
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297 strcpy(ret, "md5 ");
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298
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299 for (i = 4, h = 0; i < buflen; i+=3, h++) {
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300 ret[i] = hexdig(hash[h] >> 4);
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301 ret[i+1] = hexdig(hash[h] & 0x0f);
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302 ret[i+2] = ':';
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303 }
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304 ret[buflen-1] = 0x0;
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305
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306 return ret;
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307 }
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diff changeset
308
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diff changeset
309 #else /* use SHA1 rather than MD5 for fingerprint */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
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diff changeset
310 static char * sign_key_sha1_fingerprint(unsigned char* keyblob,
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
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parents: 44
diff changeset
311 unsigned int keybloblen) {
4
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parents:
diff changeset
312
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diff changeset
313 char * ret;
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parents:
diff changeset
314 hash_state hs;
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parents:
diff changeset
315 unsigned char hash[SHA1_HASH_SIZE];
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parents:
diff changeset
316 unsigned int h, i;
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parents:
diff changeset
317 unsigned int buflen;
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diff changeset
318
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parents:
diff changeset
319 sha1_init(&hs);
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320
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parents:
diff changeset
321 /* skip the size int of the string - this is a bit messy */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
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parents: 44
diff changeset
322 sha1_process(&hs, keyblob, keybloblen);
4
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323
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parents:
diff changeset
324 sha1_done(&hs, hash);
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parents:
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325
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parents:
diff changeset
326 /* "sha1 hexfingerprinthere\0", each hex digit is "AB:" etc */
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parents:
diff changeset
327 buflen = 5 + 3*SHA1_HASH_SIZE;
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diff changeset
328 ret = (char*)m_malloc(buflen);
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parents:
diff changeset
329
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parents:
diff changeset
330 strcpy(ret, "sha1 ");
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diff changeset
331
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parents:
diff changeset
332 for (i = 5, h = 0; i < buflen; i+=3, h++) {
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parents:
diff changeset
333 ret[i] = hexdig(hash[h] >> 4);
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diff changeset
334 ret[i+1] = hexdig(hash[h] & 0x0f);
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parents:
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335 ret[i+2] = ':';
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parents:
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336 }
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diff changeset
337 ret[buflen-1] = 0x0;
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diff changeset
338
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parents:
diff changeset
339 return ret;
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parents:
diff changeset
340 }
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341
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diff changeset
342 #endif /* MD5/SHA1 switch */
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343
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344 /* This will return a freshly malloced string, containing a fingerprint
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345 * in either sha1 or md5 */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
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diff changeset
346 char * sign_key_fingerprint(unsigned char* keyblob, unsigned int keybloblen) {
4
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347
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diff changeset
348 #ifdef DROPBEAR_MD5_HMAC
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
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parents: 44
diff changeset
349 return sign_key_md5_fingerprint(keyblob, keybloblen);
4
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350 #else
51
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parents: 44
diff changeset
351 return sign_key_sha1_fingerprint(keyblob, keybloblen);
4
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parents:
diff changeset
352 #endif
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parents:
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353 }
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parents:
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354
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
355 void buf_put_sign(buffer* buf, sign_key *key, int type,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
356 const unsigned char *data, unsigned int len) {
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parents:
diff changeset
357
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parents:
diff changeset
358 buffer *sigblob;
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parents:
diff changeset
359
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
360 sigblob = buf_new(MAX_PUBKEY_SIZE);
4
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parents:
diff changeset
361
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
362 #ifdef DROPBEAR_DSS
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
363 if (type == DROPBEAR_SIGNKEY_DSS) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
364 buf_put_dss_sign(sigblob, key->dsskey, data, len);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
365 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
366 #endif
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
367 #ifdef DROPBEAR_RSA
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
368 if (type == DROPBEAR_SIGNKEY_RSA) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
369 buf_put_rsa_sign(sigblob, key->rsakey, data, len);
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parents:
diff changeset
370 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
371 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
372 if (sigblob->len == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
373 dropbear_exit("non-matching signing type");
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
374 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
375
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
376 buf_setpos(sigblob, 0);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
377 buf_putstring(buf, buf_getptr(sigblob, sigblob->len),
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
378 sigblob->len);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380 buf_free(sigblob);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
381
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
382 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
383
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
384 #ifdef DROPBEAR_SIGNKEY_VERIFY
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
385 /* Return DROPBEAR_SUCCESS or DROPBEAR_FAILURE.
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
386 * If FAILURE is returned, the position of
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387 * buf is undefined. If SUCCESS is returned, buf will be positioned after the
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
388 * signature blob */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
389 int buf_verify(buffer * buf, sign_key *key, const unsigned char *data,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
390 unsigned int len) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
391
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
392 unsigned int bloblen;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
393 unsigned char * ident = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
394 unsigned int identlen = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
395
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
396 TRACE(("enter buf_verify"));
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
397
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
398 bloblen = buf_getint(buf);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
399 ident = buf_getstring(buf, &identlen);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
400
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
401 #ifdef DROPBEAR_DSS
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
402 if (bloblen == DSS_SIGNATURE_SIZE &&
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403 memcmp(ident, SSH_SIGNKEY_DSS, identlen) == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404 m_free(ident);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405 return buf_dss_verify(buf, key->dsskey, data, len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
406 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
408
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
409 #ifdef DROPBEAR_RSA
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410 if (memcmp(ident, SSH_SIGNKEY_RSA, identlen) == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411 m_free(ident);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
412 return buf_rsa_verify(buf, key->rsakey, data, len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
414 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416 m_free(ident);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
417 dropbear_exit("non-matching signing type");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
418 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
419 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
420 #endif /* DROPBEAR_SIGNKEY_VERIFY */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
421
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
422 #ifdef DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
423
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
424 /* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE when given a buffer containing
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
425 * a key, a key, and a type. The buffer is positioned at the start of the
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
426 * base64 data, and contains no trailing data */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
427 int cmp_base64_key(const unsigned char* keyblob, unsigned int keybloblen,
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
428 const unsigned char* algoname, unsigned int algolen,
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
429 buffer * line) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
430
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
431 buffer * decodekey = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
432 int ret = DROPBEAR_FAILURE;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
433 unsigned int len, filealgolen;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
434 unsigned long decodekeylen;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
435 unsigned char* filealgo = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
436
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
437 /* now we have the actual data */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
438 len = line->len - line->pos;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
439 decodekeylen = len * 2; /* big to be safe */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
440 decodekey = buf_new(decodekeylen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
441
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
442 if (base64_decode(buf_getptr(line, len), len,
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
443 buf_getwriteptr(decodekey, decodekey->size),
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
444 &decodekeylen) != CRYPT_OK) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
445 TRACE(("checkpubkey: base64 decode failed"));
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
446 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
447 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
448 TRACE(("checkpubkey: base64_decode success"));
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
449 buf_incrlen(decodekey, decodekeylen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
450
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
451 /* compare the keys */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
452 if ( ( decodekeylen != keybloblen )
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
453 || memcmp( buf_getptr(decodekey, decodekey->len),
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
454 keyblob, decodekey->len) != 0) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
455 TRACE(("checkpubkey: compare failed"));
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
456 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
457 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
458
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
459 /* ... and also check that the algo specified and the algo in the key
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
460 * itself match */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
461 filealgolen = buf_getint(decodekey);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
462 filealgo = buf_getptr(decodekey, filealgolen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
463 if (filealgolen != algolen || memcmp(filealgo, algoname, algolen) != 0) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
464 TRACE(("checkpubkey: algo match failed"));
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
465 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
466 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
467
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
468 /* All checks passed */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
469 ret = DROPBEAR_SUCCESS;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
470
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
471 out:
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
472 buf_free(decodekey);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
473 decodekey = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
474 return ret;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
475 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
476 #endif