annotate signkey.c @ 1368:10df23099071 fuzz

split out checkpubkey_line() separately
author Matt Johnston <matt@ucc.asn.au>
date Tue, 23 May 2017 22:29:21 +0800
parents 74a22c562cdf
children ddfcadca3c4c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "dbutil.h"
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27 #include "signkey.h"
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28 #include "buffer.h"
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29 #include "ssh.h"
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30 #include "ecdsa.h"
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31
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32 static const char * const signkey_names[DROPBEAR_SIGNKEY_NUM_NAMED] = {
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33 #if DROPBEAR_RSA
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34 "ssh-rsa",
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35 #endif
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36 #if DROPBEAR_DSS
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37 "ssh-dss",
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38 #endif
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39 #if 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 #endif /* DROPBEAR_ECDSA */
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44 };
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45
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46 /* malloc a new sign_key and set the dss and rsa keys to NULL */
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47 sign_key * new_sign_key() {
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48
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49 sign_key * ret;
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50
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51 ret = (sign_key*)m_malloc(sizeof(sign_key));
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52 ret->type = DROPBEAR_SIGNKEY_NONE;
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53 ret->source = SIGNKEY_SOURCE_INVALID;
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54 return ret;
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55 }
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56
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57 /* Returns key name corresponding to the type. Exits fatally
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58 * if the type is invalid */
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59 const char* signkey_name_from_type(enum signkey_type type, unsigned int *namelen) {
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60 if (type >= DROPBEAR_SIGNKEY_NUM_NAMED) {
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61 dropbear_exit("Bad key type %d", type);
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62 }
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63
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64 if (namelen) {
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65 *namelen = strlen(signkey_names[type]);
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66 }
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67 return signkey_names[type];
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68 }
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69
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70 /* Returns DROPBEAR_SIGNKEY_NONE if none match */
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71 enum signkey_type signkey_type_from_name(const char* name, unsigned int namelen) {
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72 int i;
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73 for (i = 0; i < DROPBEAR_SIGNKEY_NUM_NAMED; i++) {
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74 const char *fixed_name = signkey_names[i];
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75 if (namelen == strlen(fixed_name)
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76 && memcmp(fixed_name, name, namelen) == 0) {
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77
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78 #if DROPBEAR_ECDSA
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79 /* Some of the ECDSA key sizes are defined even if they're not compiled in */
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80 if (0
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81 #ifndef DROPBEAR_ECC_256
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82 || i == DROPBEAR_SIGNKEY_ECDSA_NISTP256
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83 #endif
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84 #ifndef DROPBEAR_ECC_384
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85 || i == DROPBEAR_SIGNKEY_ECDSA_NISTP384
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86 #endif
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87 #ifndef DROPBEAR_ECC_521
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88 || i == DROPBEAR_SIGNKEY_ECDSA_NISTP521
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89 #endif
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90 ) {
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91 TRACE(("attempt to use ecdsa type %d not compiled in", i))
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92 return DROPBEAR_SIGNKEY_NONE;
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93 }
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94 #endif
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95
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96 return (enum signkey_type)i;
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97 }
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98 }
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99
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100 TRACE(("signkey_type_from_name unexpected key type."))
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101
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102 return DROPBEAR_SIGNKEY_NONE;
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103 }
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104
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105 /* Returns a pointer to the key part specific to "type".
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106 Be sure to check both (ret != NULL) and (*ret != NULL) */
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107 void **
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108 signkey_key_ptr(sign_key *key, enum signkey_type type) {
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109 switch (type) {
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110 #if DROPBEAR_ECDSA
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111 #if DROPBEAR_ECC_256
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112 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
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113 return (void**)&key->ecckey256;
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114 #endif
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115 #if DROPBEAR_ECC_384
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116 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
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117 return (void**)&key->ecckey384;
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118 #endif
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119 #if DROPBEAR_ECC_521
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120 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
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121 return (void**)&key->ecckey521;
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122 #endif
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123 #endif /* DROPBEAR_ECDSA */
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124 #if DROPBEAR_RSA
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125 case DROPBEAR_SIGNKEY_RSA:
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126 return (void**)&key->rsakey;
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127 #endif
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128 #if DROPBEAR_DSS
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129 case DROPBEAR_SIGNKEY_DSS:
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130 return (void**)&key->dsskey;
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131 #endif
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132 default:
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133 return NULL;
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134 }
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135 }
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136
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137 /* returns DROPBEAR_SUCCESS on success, DROPBEAR_FAILURE on fail.
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138 * type should be set by the caller to specify the type to read, and
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139 * on return is set to the type read (useful when type = _ANY) */
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140 int buf_get_pub_key(buffer *buf, sign_key *key, enum signkey_type *type) {
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141
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142 char *ident;
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143 unsigned int len;
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144 enum signkey_type keytype;
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145 int ret = DROPBEAR_FAILURE;
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146
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147 TRACE2(("enter buf_get_pub_key"))
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148
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149 ident = buf_getstring(buf, &len);
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150 keytype = signkey_type_from_name(ident, len);
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151 m_free(ident);
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152
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153 if (*type != DROPBEAR_SIGNKEY_ANY && *type != keytype) {
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154 TRACE(("buf_get_pub_key bad type - got %d, expected %d", keytype, *type))
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155 return DROPBEAR_FAILURE;
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156 }
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157
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158 TRACE2(("buf_get_pub_key keytype is %d", keytype))
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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 #if 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 = m_malloc(sizeof(*key->dsskey));
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169 ret = buf_get_dss_pub_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 #if 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 = m_malloc(sizeof(*key->rsakey));
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179 ret = buf_get_rsa_pub_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 #if DROPBEAR_ECDSA
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186 if (signkey_is_ecdsa(keytype)) {
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187 ecc_key **eck = (ecc_key**)signkey_key_ptr(key, keytype);
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188 if (eck) {
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189 if (*eck) {
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190 ecc_free(*eck);
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191 m_free(*eck);
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192 *eck = NULL;
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193 }
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194 *eck = buf_get_ecdsa_pub_key(buf);
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195 if (*eck) {
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196 ret = DROPBEAR_SUCCESS;
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197 }
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198 }
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199 }
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200 #endif
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201
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202 TRACE2(("leave buf_get_pub_key"))
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203
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204 return ret;
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205
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206 }
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207
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208 /* returns DROPBEAR_SUCCESS on success, DROPBEAR_FAILURE on fail.
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209 * type should be set by the caller to specify the type to read, and
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210 * on return is set to the type read (useful when type = _ANY) */
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211 int buf_get_priv_key(buffer *buf, sign_key *key, enum signkey_type *type) {
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212
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213 char *ident;
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214 unsigned int len;
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215 enum signkey_type keytype;
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216 int ret = DROPBEAR_FAILURE;
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217
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218 TRACE2(("enter buf_get_priv_key"))
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219
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220 ident = buf_getstring(buf, &len);
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221 keytype = signkey_type_from_name(ident, len);
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222 m_free(ident);
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223
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224 if (*type != DROPBEAR_SIGNKEY_ANY && *type != keytype) {
165
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225 TRACE(("wrong key type: %d %d", *type, keytype))
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226 return DROPBEAR_FAILURE;
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227 }
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228
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229 *type = keytype;
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230
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231 /* Rewind the buffer back before "ssh-rsa" etc */
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232 buf_incrpos(buf, -len - 4);
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233
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234 #if DROPBEAR_DSS
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235 if (keytype == DROPBEAR_SIGNKEY_DSS) {
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236 dss_key_free(key->dsskey);
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237 key->dsskey = m_malloc(sizeof(*key->dsskey));
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238 ret = buf_get_dss_priv_key(buf, key->dsskey);
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239 if (ret == DROPBEAR_FAILURE) {
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240 m_free(key->dsskey);
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241 }
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242 }
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243 #endif
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244 #if DROPBEAR_RSA
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245 if (keytype == DROPBEAR_SIGNKEY_RSA) {
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246 rsa_key_free(key->rsakey);
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247 key->rsakey = m_malloc(sizeof(*key->rsakey));
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248 ret = buf_get_rsa_priv_key(buf, key->rsakey);
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249 if (ret == DROPBEAR_FAILURE) {
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250 m_free(key->rsakey);
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251 }
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252 }
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253 #endif
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254 #if DROPBEAR_ECDSA
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255 if (signkey_is_ecdsa(keytype)) {
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diff changeset
256 ecc_key **eck = (ecc_key**)signkey_key_ptr(key, keytype);
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257 if (eck) {
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diff changeset
258 if (*eck) {
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diff changeset
259 ecc_free(*eck);
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260 m_free(*eck);
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261 *eck = NULL;
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262 }
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263 *eck = buf_get_ecdsa_priv_key(buf);
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diff changeset
264 if (*eck) {
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265 ret = DROPBEAR_SUCCESS;
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266 }
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267 }
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268 }
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269 #endif
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270
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271 TRACE2(("leave buf_get_priv_key"))
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272
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273 return ret;
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274
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275 }
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276
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277 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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278 void buf_put_pub_key(buffer* buf, sign_key *key, enum signkey_type type) {
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279
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280 buffer *pubkeys;
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281
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282 TRACE2(("enter buf_put_pub_key"))
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diff changeset
283 pubkeys = buf_new(MAX_PUBKEY_SIZE);
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284
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285 #if DROPBEAR_DSS
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286 if (type == DROPBEAR_SIGNKEY_DSS) {
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287 buf_put_dss_pub_key(pubkeys, key->dsskey);
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288 }
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289 #endif
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290 #if DROPBEAR_RSA
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291 if (type == DROPBEAR_SIGNKEY_RSA) {
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292 buf_put_rsa_pub_key(pubkeys, key->rsakey);
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293 }
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294 #endif
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295 #if DROPBEAR_ECDSA
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296 if (signkey_is_ecdsa(type)) {
841
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297 ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
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298 if (eck && *eck) {
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299 buf_put_ecdsa_pub_key(pubkeys, *eck);
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300 }
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301 }
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302 #endif
4
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303 if (pubkeys->len == 0) {
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304 dropbear_exit("Bad key types in buf_put_pub_key");
4
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305 }
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306
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307 buf_putbufstring(buf, pubkeys);
4
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308 buf_free(pubkeys);
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309 TRACE2(("leave buf_put_pub_key"))
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310 }
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311
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312 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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313 void buf_put_priv_key(buffer* buf, sign_key *key, enum signkey_type type) {
4
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314
165
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diff changeset
315 TRACE(("enter buf_put_priv_key"))
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316 TRACE(("type is %d", type))
4
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317
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318 #if DROPBEAR_DSS
4
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319 if (type == DROPBEAR_SIGNKEY_DSS) {
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320 buf_put_dss_priv_key(buf, key->dsskey);
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321 TRACE(("leave buf_put_priv_key: dss done"))
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322 return;
4
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323 }
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324 #endif
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325 #if DROPBEAR_RSA
4
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326 if (type == DROPBEAR_SIGNKEY_RSA) {
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327 buf_put_rsa_priv_key(buf, key->rsakey);
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328 TRACE(("leave buf_put_priv_key: rsa done"))
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329 return;
4
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330 }
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331 #endif
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332 #if DROPBEAR_ECDSA
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333 if (signkey_is_ecdsa(type)) {
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334 ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
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335 if (eck && *eck) {
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336 buf_put_ecdsa_priv_key(buf, *eck);
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diff changeset
337 TRACE(("leave buf_put_priv_key: ecdsa done"))
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diff changeset
338 return;
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diff changeset
339 }
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340 }
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diff changeset
341 #endif
594
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diff changeset
342 dropbear_exit("Bad key types in put pub key");
4
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343 }
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344
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345 void sign_key_free(sign_key *key) {
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346
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347 TRACE2(("enter sign_key_free"))
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348
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diff changeset
349 #if DROPBEAR_DSS
4
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350 dss_key_free(key->dsskey);
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351 key->dsskey = NULL;
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352 #endif
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353 #if DROPBEAR_RSA
4
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354 rsa_key_free(key->rsakey);
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355 key->rsakey = NULL;
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356 #endif
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diff changeset
357 #if DROPBEAR_ECDSA
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diff changeset
358 #if DROPBEAR_ECC_256
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diff changeset
359 if (key->ecckey256) {
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diff changeset
360 ecc_free(key->ecckey256);
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diff changeset
361 m_free(key->ecckey256);
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diff changeset
362 key->ecckey256 = NULL;
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diff changeset
363 }
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diff changeset
364 #endif
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365 #if DROPBEAR_ECC_384
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diff changeset
366 if (key->ecckey384) {
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diff changeset
367 ecc_free(key->ecckey384);
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368 m_free(key->ecckey384);
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diff changeset
369 key->ecckey384 = NULL;
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370 }
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diff changeset
371 #endif
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diff changeset
372 #if DROPBEAR_ECC_521
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diff changeset
373 if (key->ecckey521) {
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diff changeset
374 ecc_free(key->ecckey521);
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diff changeset
375 m_free(key->ecckey521);
807
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diff changeset
376 key->ecckey521 = NULL;
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377 }
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diff changeset
378 #endif
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diff changeset
379 #endif
4
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380
551
c3f2ec71e3d4 New standard linked list to use, rather than adhoc SignKeyList or TCPFwdList
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diff changeset
381 m_free(key->filename);
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diff changeset
382
4
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383 m_free(key);
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384 TRACE2(("leave sign_key_free"))
4
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385 }
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386
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diff changeset
387 static char hexdig(unsigned char x) {
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388 if (x > 0xf)
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389 return 'X';
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390
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391 if (x < 10)
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392 return '0' + x;
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393 else
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394 return 'a' + x - 10;
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395 }
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396
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diff changeset
397 /* Since we're not sure if we'll have md5 or sha1, we present both.
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diff changeset
398 * MD5 is used in preference, but sha1 could still be useful */
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diff changeset
399 #if DROPBEAR_MD5_HMAC
51
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diff changeset
400 static char * sign_key_md5_fingerprint(unsigned char* keyblob,
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
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diff changeset
401 unsigned int keybloblen) {
4
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diff changeset
402
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diff changeset
403 char * ret;
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diff changeset
404 hash_state hs;
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diff changeset
405 unsigned char hash[MD5_HASH_SIZE];
214
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diff changeset
406 unsigned int i;
4
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diff changeset
407 unsigned int buflen;
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diff changeset
408
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diff changeset
409 md5_init(&hs);
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diff changeset
410
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diff changeset
411 /* skip the size int of the string - this is a bit messy */
51
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diff changeset
412 md5_process(&hs, keyblob, keybloblen);
4
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diff changeset
413
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diff changeset
414 md5_done(&hs, hash);
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diff changeset
415
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diff changeset
416 /* "md5 hexfingerprinthere\0", each hex digit is "AB:" etc */
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diff changeset
417 buflen = 4 + 3*MD5_HASH_SIZE;
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diff changeset
418 ret = (char*)m_malloc(buflen);
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diff changeset
419
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diff changeset
420 memset(ret, 'Z', buflen);
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diff changeset
421 strcpy(ret, "md5 ");
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diff changeset
422
214
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parents: 165
diff changeset
423 for (i = 0; i < MD5_HASH_SIZE; i++) {
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parents: 165
diff changeset
424 unsigned int pos = 4 + i*3;
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diff changeset
425 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
426 ret[pos+1] = hexdig(hash[i] & 0x0f);
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diff changeset
427 ret[pos+2] = ':';
4
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diff changeset
428 }
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diff changeset
429 ret[buflen-1] = 0x0;
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diff changeset
430
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parents:
diff changeset
431 return ret;
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diff changeset
432 }
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diff changeset
433
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diff changeset
434 #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
435 static char * sign_key_sha1_fingerprint(unsigned char* keyblob,
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
436 unsigned int keybloblen) {
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
437
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parents:
diff changeset
438 char * ret;
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
439 hash_state hs;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
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diff changeset
440 unsigned char hash[SHA1_HASH_SIZE];
214
5a75f8a21503 Change the format of for loops, gcc4 produces incorrect binaries with
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
441 unsigned int i;
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
442 unsigned int buflen;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
443
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
444 sha1_init(&hs);
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parents:
diff changeset
445
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
446 /* skip the size int of the string - this is a bit messy */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
447 sha1_process(&hs, keyblob, keybloblen);
4
fe6bca95afa7 Makefile.in contains updated files required
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diff changeset
448
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
449 sha1_done(&hs, hash);
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parents:
diff changeset
450
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
451 /* "sha1!! hexfingerprinthere\0", each hex digit is "AB:" etc */
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
452 buflen = 7 + 3*SHA1_HASH_SIZE;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
453 ret = (char*)m_malloc(buflen);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
455 strcpy(ret, "sha1!! ");
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
456
214
5a75f8a21503 Change the format of for loops, gcc4 produces incorrect binaries with
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
457 for (i = 0; i < SHA1_HASH_SIZE; i++) {
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
458 unsigned int pos = 7 + 3*i;
214
5a75f8a21503 Change the format of for loops, gcc4 produces incorrect binaries with
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
459 ret[pos] = hexdig(hash[i] >> 4);
5a75f8a21503 Change the format of for loops, gcc4 produces incorrect binaries with
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
460 ret[pos+1] = hexdig(hash[i] & 0x0f);
5a75f8a21503 Change the format of for loops, gcc4 produces incorrect binaries with
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
461 ret[pos+2] = ':';
4
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parents:
diff changeset
462 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
463 ret[buflen-1] = 0x0;
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Matt Johnston <matt@ucc.asn.au>
parents:
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464
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
465 return ret;
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parents:
diff changeset
466 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
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467
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
468 #endif /* MD5/SHA1 switch */
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parents:
diff changeset
469
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
470 /* This will return a freshly malloced string, containing a fingerprint
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
471 * in either sha1 or md5 */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
472 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
473
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
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parents: 1278
diff changeset
474 #if 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
475 return sign_key_md5_fingerprint(keyblob, keybloblen);
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
476 #else
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
477 return sign_key_sha1_fingerprint(keyblob, keybloblen);
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
478 #endif
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
479 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
480
841
d4ce5269a439 Fix specifying a keysize for key generation, fix key name arguments
Matt Johnston <matt@ucc.asn.au>
parents: 807
diff changeset
481 void buf_put_sign(buffer* buf, sign_key *key, enum signkey_type 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
482 buffer *data_buf) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
483 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
484 sigblob = buf_new(MAX_PUBKEY_SIZE);
4
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parents:
diff changeset
485
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1278
diff changeset
486 #if DROPBEAR_DSS
4
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parents:
diff changeset
487 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
488 buf_put_dss_sign(sigblob, key->dsskey, data_buf);
4
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parents:
diff changeset
489 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
490 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1278
diff changeset
491 #if DROPBEAR_RSA
4
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parents:
diff changeset
492 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
493 buf_put_rsa_sign(sigblob, key->rsakey, data_buf);
4
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parents:
diff changeset
494 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
495 #endif
1295
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parents: 1278
diff changeset
496 #if DROPBEAR_ECDSA
846
b298bb438625 refactor key generation, make it generate as required.
Matt Johnston <matt@ucc.asn.au>
parents: 841
diff changeset
497 if (signkey_is_ecdsa(type)) {
841
d4ce5269a439 Fix specifying a keysize for key generation, fix key name arguments
Matt Johnston <matt@ucc.asn.au>
parents: 807
diff changeset
498 ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
1362
74a22c562cdf Fix null pointer dereference found by libfuzzer
Matt Johnston <matt@ucc.asn.au>
parents: 1295
diff changeset
499 if (eck && *eck) {
807
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
500 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
501 }
4
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parents:
diff changeset
502 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
503 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
504 if (sigblob->len == 0) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
505 dropbear_exit("Non-matching signing type");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
506 }
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
507 buf_putbufstring(buf, sigblob);
4
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parents:
diff changeset
508 buf_free(sigblob);
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
509
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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
1295
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parents: 1278
diff changeset
512 #if DROPBEAR_SIGNKEY_VERIFY
4
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parents:
diff changeset
513 /* Return DROPBEAR_SUCCESS or DROPBEAR_FAILURE.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
514 * If FAILURE is returned, the position of
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
515 * 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
516 * 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
517 int buf_verify(buffer * buf, sign_key *key, buffer *data_buf) {
4
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parents:
diff changeset
518
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 1058
diff changeset
519 char *type_name = NULL;
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
520 unsigned int type_name_len = 0;
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
521 enum signkey_type type;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
522
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
523 TRACE(("enter buf_verify"))
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
524
864
30ab30e46452 Fix some warnings
Matt Johnston <matt@ucc.asn.au>
parents: 857
diff changeset
525 buf_getint(buf); /* blob length */
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1094
diff changeset
526 type_name = buf_getstring(buf, &type_name_len);
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
527 type = signkey_type_from_name(type_name, type_name_len);
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
528 m_free(type_name);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
529
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1278
diff changeset
530 #if DROPBEAR_DSS
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
531 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
532 if (key->dsskey == NULL) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
533 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
534 }
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
535 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
536 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
537 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
538
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1278
diff changeset
539 #if DROPBEAR_RSA
794
d386defb5376 more ecdsa signkey work, not correct
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
540 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
541 if (key->rsakey == NULL) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
542 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
543 }
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
544 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
545 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
546 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1278
diff changeset
547 #if DROPBEAR_ECDSA
846
b298bb438625 refactor key generation, make it generate as required.
Matt Johnston <matt@ucc.asn.au>
parents: 841
diff changeset
548 if (signkey_is_ecdsa(type)) {
841
d4ce5269a439 Fix specifying a keysize for key generation, fix key name arguments
Matt Johnston <matt@ucc.asn.au>
parents: 807
diff changeset
549 ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
807
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
550 if (eck) {
75509065db53 have separate ecdsa keys for each size
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
551 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
552 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
553 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
554 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
555
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
556 dropbear_exit("Non-matching signing type");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
557 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
558 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
559 #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
560
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1278
diff changeset
561 #if DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
562
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
563 /* 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
564 * 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
565 * base64 data, and contains no trailing data */
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
566 /* 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
567 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
568 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
569 const unsigned char* algoname, unsigned int algolen,
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
570 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
571
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
572 buffer * decodekey = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
573 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
574 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
575 unsigned long decodekeylen;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
576 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
577
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
578 /* 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
579 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
580 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
581 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
582
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
583 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
584 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
585 &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
586 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
587 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
588 }
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
589 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
590 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
591
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
592 if (fingerprint) {
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
593 *fingerprint = sign_key_fingerprint(buf_getptr(decodekey, decodekeylen),
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
594 decodekeylen);
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
595 }
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 244
diff changeset
596
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
597 /* compare the keys */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
598 if ( ( decodekeylen != keybloblen )
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
599 || 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
600 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
601 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
602 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
603 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
604
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
605 /* ... 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
606 * itself match */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
607 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
608 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
609 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
610 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
611 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
612 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
613
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
614 /* All checks passed */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
615 ret = DROPBEAR_SUCCESS;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
616
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
617 out:
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
618 buf_free(decodekey);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
619 decodekey = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
620 return ret;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
621 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
622 #endif