annotate signkey.c @ 840:5128e525c8fa ecc

Default to some larger key sizes
author Matt Johnston <matt@ucc.asn.au>
date Thu, 31 Oct 2013 22:49:15 +0800
parents 75509065db53
children d4ce5269a439
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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 #include "ecdsa.h"
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31
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32 static const char *signkey_names[DROPBEAR_SIGNKEY_NUM_NAMED] = {
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33 #ifdef DROPBEAR_RSA
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34 "ssh-rsa",
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35 #endif
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36 #ifdef DROPBEAR_DSS
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37 "ssh-dss",
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38 #endif
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39 #ifdef DROPBEAR_ECDSA
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40 "ecdsa-sha2-nistp256",
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41 "ecdsa-sha2-nistp384",
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42 "ecdsa-sha2-nistp521",
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43 "ecdsa" // for keygen
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44 #endif // DROPBEAR_ECDSA
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45 };
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46
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47 /* malloc a new sign_key and set the dss and rsa keys to NULL */
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48 sign_key * new_sign_key() {
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49
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50 sign_key * ret;
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51
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52 ret = (sign_key*)m_malloc(sizeof(sign_key));
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53 ret->type = DROPBEAR_SIGNKEY_NONE;
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54 ret->source = SIGNKEY_SOURCE_INVALID;
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55 return ret;
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56 }
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57
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58 /* Returns key name corresponding to the type. Exits fatally
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59 * if the type is invalid */
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60 const char* signkey_name_from_type(enum signkey_type type, unsigned int *namelen) {
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61 if (type >= DROPBEAR_SIGNKEY_NUM_NAMED) {
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62 dropbear_exit("Bad key type %d", type);
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63 }
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64
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65 if (namelen) {
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66 *namelen = strlen(signkey_names[type]);
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67 }
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68 return signkey_names[type];
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69 }
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70
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71 /* Returns DROPBEAR_SIGNKEY_NONE if none match */
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72 enum signkey_type signkey_type_from_name(const char* name, unsigned int namelen) {
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73 int i;
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74 for (i = 0; i < DROPBEAR_SIGNKEY_NUM_NAMED; i++) {
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75 const char *fixed_name = signkey_names[i];
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76 if (namelen == strlen(fixed_name)
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77 && memcmp(fixed_name, name, namelen) == 0) {
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78
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79 #ifdef DROPBEAR_ECDSA
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80 /* Some of the ECDSA key sizes are defined even if they're not compiled in */
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81 if (0
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82 #ifndef DROPBEAR_ECC_256
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83 || i == DROPBEAR_SIGNKEY_ECDSA_NISTP256
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84 #endif
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85 #ifndef DROPBEAR_ECC_384
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86 || i == DROPBEAR_SIGNKEY_ECDSA_NISTP384
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87 #endif
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88 #ifndef DROPBEAR_ECC_521
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89 || i == DROPBEAR_SIGNKEY_ECDSA_NISTP521
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90 #endif
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91 ) {
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92 TRACE(("attempt to use ecdsa type %d not compiled in", i))
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93 return DROPBEAR_SIGNKEY_NONE;
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94 }
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95 #endif
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96
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97 return i;
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98 }
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99 }
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100
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101 TRACE(("signkey_type_from_name unexpected key type."))
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102
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103 return DROPBEAR_SIGNKEY_NONE;
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104 }
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105
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106 #ifdef DROPBEAR_ECDSA
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107 ecc_key **
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108 signkey_ecc_key_ptr(sign_key *key, enum signkey_type ecc_type) {
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109 switch (ecc_type) {
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110 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
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111 return &key->ecckey256;
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112 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
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113 return &key->ecckey384;
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114 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
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115 return &key->ecckey521;
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116 default:
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117 return NULL;
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118 }
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119 }
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120 #endif
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121
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122 /* returns DROPBEAR_SUCCESS on success, DROPBEAR_FAILURE on fail.
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123 * type should be set by the caller to specify the type to read, and
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124 * on return is set to the type read (useful when type = _ANY) */
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125 int buf_get_pub_key(buffer *buf, sign_key *key, int *type) {
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126
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127 unsigned char* ident;
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128 unsigned int len;
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129 int keytype;
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130 int ret = DROPBEAR_FAILURE;
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131
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132 TRACE2(("enter buf_get_pub_key"))
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133
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134 ident = buf_getstring(buf, &len);
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135 keytype = signkey_type_from_name(ident, len);
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136 m_free(ident);
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137
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138 if (*type != DROPBEAR_SIGNKEY_ANY && *type != keytype) {
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139 TRACE(("buf_get_pub_key bad type - got %d, expected %d", keytype, *type))
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140 return DROPBEAR_FAILURE;
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141 }
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142
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143 TRACE2(("buf_get_pub_key keytype is %d", keytype))
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144
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145 *type = keytype;
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146
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147 /* Rewind the buffer back before "ssh-rsa" etc */
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148 buf_incrpos(buf, -len - 4);
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149
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150 #ifdef DROPBEAR_DSS
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151 if (keytype == DROPBEAR_SIGNKEY_DSS) {
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152 dss_key_free(key->dsskey);
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153 key->dsskey = m_malloc(sizeof(*key->dsskey));
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154 ret = buf_get_dss_pub_key(buf, key->dsskey);
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155 if (ret == DROPBEAR_FAILURE) {
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156 m_free(key->dsskey);
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157 }
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158 }
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159 #endif
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160 #ifdef DROPBEAR_RSA
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161 if (keytype == DROPBEAR_SIGNKEY_RSA) {
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162 rsa_key_free(key->rsakey);
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163 key->rsakey = m_malloc(sizeof(*key->rsakey));
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164 ret = buf_get_rsa_pub_key(buf, key->rsakey);
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165 if (ret == DROPBEAR_FAILURE) {
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166 m_free(key->rsakey);
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167 }
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168 }
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169 #endif
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170 #ifdef DROPBEAR_ECDSA
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171 {
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172 ecc_key **eck = signkey_ecc_key_ptr(key, keytype);
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173 if (eck) {
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174 if (*eck) {
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175 ecc_free(*eck);
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176 *eck = NULL;
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177 }
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178 *eck = buf_get_ecdsa_pub_key(buf);
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179 if (*eck) {
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180 ret = DROPBEAR_SUCCESS;
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181 }
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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 TRACE2(("leave buf_get_pub_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 /* returns DROPBEAR_SUCCESS on success, DROPBEAR_FAILURE on fail.
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193 * type should be set by the caller to specify the type to read, and
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194 * on return is set to the type read (useful when type = _ANY) */
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195 int buf_get_priv_key(buffer *buf, sign_key *key, int *type) {
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196
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197 unsigned char* ident;
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198 unsigned int len;
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199 int keytype;
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200 int ret = DROPBEAR_FAILURE;
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201
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202 TRACE2(("enter buf_get_priv_key"))
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203
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204 ident = buf_getstring(buf, &len);
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205 keytype = signkey_type_from_name(ident, len);
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206 m_free(ident);
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207
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208 if (*type != DROPBEAR_SIGNKEY_ANY && *type != keytype) {
165
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209 TRACE(("wrong key type: %d %d", *type, keytype))
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210 return DROPBEAR_FAILURE;
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211 }
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212
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213 *type = keytype;
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214
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215 /* Rewind the buffer back before "ssh-rsa" etc */
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216 buf_incrpos(buf, -len - 4);
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217
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218 #ifdef DROPBEAR_DSS
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219 if (keytype == DROPBEAR_SIGNKEY_DSS) {
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220 dss_key_free(key->dsskey);
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221 key->dsskey = m_malloc(sizeof(*key->dsskey));
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222 ret = buf_get_dss_priv_key(buf, key->dsskey);
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223 if (ret == DROPBEAR_FAILURE) {
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224 m_free(key->dsskey);
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225 }
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226 }
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227 #endif
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228 #ifdef DROPBEAR_RSA
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229 if (keytype == DROPBEAR_SIGNKEY_RSA) {
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230 rsa_key_free(key->rsakey);
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231 key->rsakey = m_malloc(sizeof(*key->rsakey));
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232 ret = buf_get_rsa_priv_key(buf, key->rsakey);
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233 if (ret == DROPBEAR_FAILURE) {
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234 m_free(key->rsakey);
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235 }
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236 }
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237 #endif
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238 #ifdef DROPBEAR_ECDSA
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239 {
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240 ecc_key **eck = signkey_ecc_key_ptr(key, keytype);
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241 if (eck) {
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242 if (*eck) {
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243 ecc_free(*eck);
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244 *eck = NULL;
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245 }
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246 *eck = buf_get_ecdsa_priv_key(buf);
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247 if (*eck) {
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248 ret = DROPBEAR_SUCCESS;
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249 }
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250 }
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251 }
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252 #endif
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253
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254 TRACE2(("leave buf_get_priv_key"))
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255
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256 return ret;
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257
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258 }
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259
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260 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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261 void buf_put_pub_key(buffer* buf, sign_key *key, int type) {
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262
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263 buffer *pubkeys;
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264
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265 TRACE2(("enter buf_put_pub_key"))
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diff changeset
266 pubkeys = buf_new(MAX_PUBKEY_SIZE);
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267
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268 #ifdef DROPBEAR_DSS
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269 if (type == DROPBEAR_SIGNKEY_DSS) {
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270 buf_put_dss_pub_key(pubkeys, key->dsskey);
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271 }
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272 #endif
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273 #ifdef DROPBEAR_RSA
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274 if (type == DROPBEAR_SIGNKEY_RSA) {
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275 buf_put_rsa_pub_key(pubkeys, key->rsakey);
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276 }
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277 #endif
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278 #ifdef DROPBEAR_ECDSA
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279 {
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280 ecc_key **eck = signkey_ecc_key_ptr(key, type);
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diff changeset
281 if (eck) {
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282 buf_put_ecdsa_pub_key(pubkeys, *eck);
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283 }
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284 }
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285 #endif
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286 if (pubkeys->len == 0) {
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diff changeset
287 dropbear_exit("Bad key types in buf_put_pub_key");
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288 }
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289
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290 buf_putbufstring(buf, pubkeys);
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291 buf_free(pubkeys);
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292 TRACE2(("leave buf_put_pub_key"))
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293 }
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294
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295 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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296 void buf_put_priv_key(buffer* buf, sign_key *key, int type) {
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297
165
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298 TRACE(("enter buf_put_priv_key"))
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299 TRACE(("type is %d", type))
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300
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301 #ifdef DROPBEAR_DSS
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302 if (type == DROPBEAR_SIGNKEY_DSS) {
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303 buf_put_dss_priv_key(buf, key->dsskey);
165
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304 TRACE(("leave buf_put_priv_key: dss done"))
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305 return;
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306 }
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307 #endif
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308 #ifdef DROPBEAR_RSA
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309 if (type == DROPBEAR_SIGNKEY_RSA) {
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310 buf_put_rsa_priv_key(buf, key->rsakey);
165
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311 TRACE(("leave buf_put_priv_key: rsa done"))
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312 return;
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313 }
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314 #endif
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315 #ifdef DROPBEAR_ECDSA
807
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316 {
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317 ecc_key **eck = signkey_ecc_key_ptr(key, type);
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318 if (eck) {
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319 buf_put_ecdsa_priv_key(buf, *eck);
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320 TRACE(("leave buf_put_priv_key: ecdsa done"))
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321 return;
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322 }
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323 }
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diff changeset
324 #endif
594
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diff changeset
325 dropbear_exit("Bad key types in put pub key");
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326 }
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327
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328 void sign_key_free(sign_key *key) {
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329
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330 TRACE2(("enter sign_key_free"))
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331
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332 #ifdef DROPBEAR_DSS
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333 dss_key_free(key->dsskey);
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334 key->dsskey = NULL;
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335 #endif
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336 #ifdef DROPBEAR_RSA
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337 rsa_key_free(key->rsakey);
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338 key->rsakey = NULL;
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339 #endif
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340 #ifdef DROPBEAR_ECDSA
807
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diff changeset
341 if (key->ecckey256) {
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diff changeset
342 ecc_free(key->ecckey256);
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diff changeset
343 key->ecckey256 = NULL;
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diff changeset
344 }
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diff changeset
345 if (key->ecckey384) {
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diff changeset
346 ecc_free(key->ecckey384);
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diff changeset
347 key->ecckey384 = NULL;
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parents: 801
diff changeset
348 }
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diff changeset
349 if (key->ecckey521) {
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diff changeset
350 ecc_free(key->ecckey521);
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diff changeset
351 key->ecckey521 = NULL;
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352 }
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353 #endif
4
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354
551
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diff changeset
355 m_free(key->filename);
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diff changeset
356
4
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357 m_free(key);
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358 TRACE2(("leave sign_key_free"))
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359 }
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360
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361 static char hexdig(unsigned char x) {
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362 if (x > 0xf)
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363 return 'X';
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364
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365 if (x < 10)
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366 return '0' + x;
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367 else
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368 return 'a' + x - 10;
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369 }
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370
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371 /* Since we're not sure if we'll have md5 or sha1, we present both.
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372 * MD5 is used in preference, but sha1 could still be useful */
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373 #ifdef DROPBEAR_MD5_HMAC
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diff changeset
374 static char * sign_key_md5_fingerprint(unsigned char* keyblob,
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diff changeset
375 unsigned int keybloblen) {
4
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376
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377 char * ret;
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378 hash_state hs;
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379 unsigned char hash[MD5_HASH_SIZE];
214
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diff changeset
380 unsigned int i;
4
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381 unsigned int buflen;
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382
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383 md5_init(&hs);
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384
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385 /* 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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diff changeset
386 md5_process(&hs, keyblob, keybloblen);
4
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387
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388 md5_done(&hs, hash);
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389
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diff changeset
390 /* "md5 hexfingerprinthere\0", each hex digit is "AB:" etc */
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diff changeset
391 buflen = 4 + 3*MD5_HASH_SIZE;
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392 ret = (char*)m_malloc(buflen);
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393
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394 memset(ret, 'Z', buflen);
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diff changeset
395 strcpy(ret, "md5 ");
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diff changeset
396
214
5a75f8a21503 Change the format of for loops, gcc4 produces incorrect binaries with
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diff changeset
397 for (i = 0; i < MD5_HASH_SIZE; i++) {
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parents: 165
diff changeset
398 unsigned int pos = 4 + i*3;
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diff changeset
399 ret[pos] = hexdig(hash[i] >> 4);
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parents: 165
diff changeset
400 ret[pos+1] = hexdig(hash[i] & 0x0f);
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diff changeset
401 ret[pos+2] = ':';
4
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diff changeset
402 }
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diff changeset
403 ret[buflen-1] = 0x0;
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diff changeset
404
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parents:
diff changeset
405 return ret;
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diff changeset
406 }
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diff changeset
407
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diff changeset
408 #else /* use SHA1 rather than MD5 for fingerprint */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
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parents: 44
diff changeset
409 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
410 unsigned int keybloblen) {
4
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diff changeset
411
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diff changeset
412 char * ret;
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diff changeset
413 hash_state hs;
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diff changeset
414 unsigned char hash[SHA1_HASH_SIZE];
214
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parents: 165
diff changeset
415 unsigned int i;
4
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diff changeset
416 unsigned int buflen;
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parents:
diff changeset
417
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diff changeset
418 sha1_init(&hs);
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diff changeset
419
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parents:
diff changeset
420 /* 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
421 sha1_process(&hs, keyblob, keybloblen);
4
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diff changeset
422
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diff changeset
423 sha1_done(&hs, hash);
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diff changeset
424
794
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diff changeset
425 /* "sha1!! hexfingerprinthere\0", each hex digit is "AB:" etc */
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parents: 793
diff changeset
426 buflen = 7 + 3*SHA1_HASH_SIZE;
4
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diff changeset
427 ret = (char*)m_malloc(buflen);
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parents:
diff changeset
428
794
d386defb5376 more ecdsa signkey work, not correct
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parents: 793
diff changeset
429 strcpy(ret, "sha1!! ");
4
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diff changeset
430
214
5a75f8a21503 Change the format of for loops, gcc4 produces incorrect binaries with
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parents: 165
diff changeset
431 for (i = 0; i < SHA1_HASH_SIZE; i++) {
794
d386defb5376 more ecdsa signkey work, not correct
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parents: 793
diff changeset
432 unsigned int pos = 7 + 3*i;
214
5a75f8a21503 Change the format of for loops, gcc4 produces incorrect binaries with
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parents: 165
diff changeset
433 ret[pos] = hexdig(hash[i] >> 4);
5a75f8a21503 Change the format of for loops, gcc4 produces incorrect binaries with
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parents: 165
diff changeset
434 ret[pos+1] = hexdig(hash[i] & 0x0f);
5a75f8a21503 Change the format of for loops, gcc4 produces incorrect binaries with
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parents: 165
diff changeset
435 ret[pos+2] = ':';
4
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diff changeset
436 }
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diff changeset
437 ret[buflen-1] = 0x0;
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parents:
diff changeset
438
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parents:
diff changeset
439 return ret;
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parents:
diff changeset
440 }
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parents:
diff changeset
441
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diff changeset
442 #endif /* MD5/SHA1 switch */
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parents:
diff changeset
443
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parents:
diff changeset
444 /* This will return a freshly malloced string, containing a fingerprint
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parents:
diff changeset
445 * in either sha1 or md5 */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
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parents: 44
diff changeset
446 char * sign_key_fingerprint(unsigned char* keyblob, unsigned int keybloblen) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
447
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
448 #ifdef DROPBEAR_MD5_HMAC
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
449 return sign_key_md5_fingerprint(keyblob, keybloblen);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
450 #else
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
451 return sign_key_sha1_fingerprint(keyblob, keybloblen);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
452 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
453 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
455 void buf_put_sign(buffer* buf, sign_key *key, int type,
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 651
diff changeset
456 buffer *data_buf) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
457 buffer *sigblob;
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
458 sigblob = buf_new(MAX_PUBKEY_SIZE);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
459
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
460 #ifdef DROPBEAR_DSS
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
461 if (type == DROPBEAR_SIGNKEY_DSS) {
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 651
diff changeset
462 buf_put_dss_sign(sigblob, key->dsskey, data_buf);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
463 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
464 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
465 #ifdef DROPBEAR_RSA
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
466 if (type == DROPBEAR_SIGNKEY_RSA) {
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 651
diff changeset
467 buf_put_rsa_sign(sigblob, key->rsakey, data_buf);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
468 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
469 #endif
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
470 #ifdef DROPBEAR_ECDSA
807
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
471 {
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
472 ecc_key **eck = signkey_ecc_key_ptr(key, type);
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
473 if (eck) {
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
474 buf_put_ecdsa_sign(sigblob, *eck, data_buf);
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
475 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
476 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
477 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
478 if (sigblob->len == 0) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
479 dropbear_exit("Non-matching signing type");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
480 }
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 651
diff changeset
481 buf_putbufstring(buf, sigblob);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
482 buf_free(sigblob);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
483
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
484 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
485
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
486 #ifdef DROPBEAR_SIGNKEY_VERIFY
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
487 /* Return DROPBEAR_SUCCESS or DROPBEAR_FAILURE.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
488 * If FAILURE is returned, the position of
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
489 * 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
490 * signature blob */
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 651
diff changeset
491 int buf_verify(buffer * buf, sign_key *key, buffer *data_buf) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
492
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
493 unsigned int bloblen;
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
494 unsigned char * type_name = NULL;
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
495 unsigned int type_name_len = 0;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
496
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 107
diff changeset
497 TRACE(("enter buf_verify"))
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
498
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
499 bloblen = buf_getint(buf);
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
500 type_name = buf_getstring(buf, &type_name_len);
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
501 enum signkey_type type = signkey_type_from_name(type_name, type_name_len);
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
502 m_free(type_name);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
503
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
504 #ifdef DROPBEAR_DSS
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
505 if (type == DROPBEAR_SIGNKEY_DSS) {
244
eb7b9f2bb8e8 - add explicit check that correct keytype exists for pubkey verification
Matt Johnston <matt@ucc.asn.au>
parents: 214
diff changeset
506 if (key->dsskey == NULL) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
507 dropbear_exit("No DSS key to verify signature");
244
eb7b9f2bb8e8 - add explicit check that correct keytype exists for pubkey verification
Matt Johnston <matt@ucc.asn.au>
parents: 214
diff changeset
508 }
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 651
diff changeset
509 return buf_dss_verify(buf, key->dsskey, data_buf);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
510 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
511 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
512
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
513 #ifdef DROPBEAR_RSA
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
514 if (type == DROPBEAR_SIGNKEY_RSA) {
244
eb7b9f2bb8e8 - add explicit check that correct keytype exists for pubkey verification
Matt Johnston <matt@ucc.asn.au>
parents: 214
diff changeset
515 if (key->rsakey == NULL) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
516 dropbear_exit("No RSA key to verify signature");
244
eb7b9f2bb8e8 - add explicit check that correct keytype exists for pubkey verification
Matt Johnston <matt@ucc.asn.au>
parents: 214
diff changeset
517 }
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 651
diff changeset
518 return buf_rsa_verify(buf, key->rsakey, data_buf);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
519 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
520 #endif
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
521 #ifdef DROPBEAR_ECDSA
807
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
522 {
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
523 ecc_key **eck = signkey_ecc_key_ptr(key, type);
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
524 if (eck) {
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
525 return buf_ecdsa_verify(buf, *eck, data_buf);
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
526 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
527 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
528 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
529
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
530 dropbear_exit("Non-matching signing type");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
531 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
532 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
533 #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
534
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
535 #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
536
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
537 /* 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
538 * 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
539 * base64 data, and contains no trailing data */
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
540 /* If fingerprint is non-NULL, it will be set to a malloc()ed fingerprint
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
541 of the key if it is successfully decoded */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
542 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
543 const unsigned char* algoname, unsigned int algolen,
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
544 buffer * line, char ** fingerprint) {
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
545
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
546 buffer * decodekey = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
547 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
548 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
549 unsigned long decodekeylen;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
550 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
551
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
552 /* 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
553 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
554 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
555 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
556
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
557 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
558 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
559 &decodekeylen) != CRYPT_OK) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 107
diff changeset
560 TRACE(("checkpubkey: base64 decode failed"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
561 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
562 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 107
diff changeset
563 TRACE(("checkpubkey: base64_decode success"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
564 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
565
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
566 if (fingerprint) {
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
567 *fingerprint = sign_key_fingerprint(buf_getptr(decodekey, decodekeylen),
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
568 decodekeylen);
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
569 }
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
570
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
571 /* compare the keys */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
572 if ( ( decodekeylen != keybloblen )
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
573 || 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
574 keyblob, decodekey->len) != 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 107
diff changeset
575 TRACE(("checkpubkey: compare failed"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
576 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
577 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
578
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
579 /* ... 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
580 * itself match */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
581 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
582 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
583 if (filealgolen != algolen || memcmp(filealgo, algoname, algolen) != 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 107
diff changeset
584 TRACE(("checkpubkey: algo match failed"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
585 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
586 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
587
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
588 /* All checks passed */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
589 ret = DROPBEAR_SUCCESS;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
590
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
591 out:
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
592 buf_free(decodekey);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
593 decodekey = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
594 return ret;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
595 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
596 #endif