Mercurial > dropbear

annotate ed25519.c @ 1712:d885a77b98e0

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avoid zero length array in base64_decode
author Matt Johnston <matt@ucc.asn.au>
date Wed, 10 Jun 2020 23:26:05 +0800
parents 41a0ff8d5a89
children 93dcc97c3f3f
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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 /* Perform Ed25519 operations on data, including reading keys, signing and
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26 * verification. */
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27
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28 #include "includes.h"
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29 #include "dbutil.h"
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30 #include "buffer.h"
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31 #include "ssh.h"
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32 #include "curve25519.h"
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33 #include "ed25519.h"
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34
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35 #if DROPBEAR_ED25519
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36
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37 /* Load a public ed25519 key from a buffer, initialising the values.
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38 * The key will have the same format as buf_put_ed25519_key.
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39 * These should be freed with ed25519_key_free.
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40 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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41 int buf_get_ed25519_pub_key(buffer *buf, dropbear_ed25519_key *key) {
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42
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43 unsigned int len;
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44
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45 TRACE(("enter buf_get_ed25519_pub_key"))
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46 dropbear_assert(key != NULL);
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47
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48 buf_incrpos(buf, 4+SSH_SIGNKEY_ED25519_LEN); /* int + "ssh-ed25519" */
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49
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50 len = buf_getint(buf);
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51 if (len != CURVE25519_LEN || buf->len - buf->pos < len) {
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52 TRACE(("leave buf_get_ed25519_pub_key: failure"))
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53 return DROPBEAR_FAILURE;
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54 }
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55
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56 m_burn(key->priv, CURVE25519_LEN);
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57 memcpy(key->pub, buf_getptr(buf, CURVE25519_LEN), CURVE25519_LEN);
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58 buf_incrpos(buf, CURVE25519_LEN);
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59
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60 TRACE(("leave buf_get_ed25519_pub_key: success"))
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61 return DROPBEAR_SUCCESS;
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62 }
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63
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64 /* Same as buf_get_ed25519_pub_key, but reads private key at the end.
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65 * Loads a public and private ed25519 key from a buffer
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66 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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67 int buf_get_ed25519_priv_key(buffer *buf, dropbear_ed25519_key *key) {
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68
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69 unsigned int len;
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70
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71 TRACE(("enter buf_get_ed25519_priv_key"))
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72 dropbear_assert(key != NULL);
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73
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74 buf_incrpos(buf, 4+SSH_SIGNKEY_ED25519_LEN); /* int + "ssh-ed25519" */
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75
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76 len = buf_getint(buf);
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77 if (len != CURVE25519_LEN*2 || buf->len - buf->pos < len) {
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78 TRACE(("leave buf_get_ed25519_priv_key: failure"))
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79 return DROPBEAR_FAILURE;
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80 }
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81
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82 memcpy(key->priv, buf_getptr(buf, CURVE25519_LEN), CURVE25519_LEN);
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83 buf_incrpos(buf, CURVE25519_LEN);
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84 memcpy(key->pub, buf_getptr(buf, CURVE25519_LEN), CURVE25519_LEN);
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85 buf_incrpos(buf, CURVE25519_LEN);
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86
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87 TRACE(("leave buf_get_ed25519_pub_key: success"))
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88 return DROPBEAR_SUCCESS;
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89 }
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90
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91 /* Clear and free the memory used by a public or private key */
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92 void ed25519_key_free(dropbear_ed25519_key *key) {
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93
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94 TRACE2(("enter ed25519_key_free"))
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95
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96 if (key == NULL) {
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97 TRACE2(("leave ed25519_key_free: key == NULL"))
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98 return;
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99 }
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100 m_burn(key->priv, CURVE25519_LEN);
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101 m_free(key);
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102
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103 TRACE2(("leave rsa_key_free"))
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104 }
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105
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106 /* Put the public ed25519 key into the buffer in the required format */
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107 void buf_put_ed25519_pub_key(buffer *buf, const dropbear_ed25519_key *key) {
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108
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109 TRACE(("enter buf_put_ed25519_pub_key"))
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110 dropbear_assert(key != NULL);
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111
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112 buf_putstring(buf, SSH_SIGNKEY_ED25519, SSH_SIGNKEY_ED25519_LEN);
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113 buf_putstring(buf, key->pub, CURVE25519_LEN);
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114
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115 TRACE(("leave buf_put_ed25519_pub_key"))
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116 }
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117
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118 /* Put the public and private ed25519 key into the buffer in the required format */
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119 void buf_put_ed25519_priv_key(buffer *buf, const dropbear_ed25519_key *key) {
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120
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121 TRACE(("enter buf_put_ed25519_priv_key"))
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122 dropbear_assert(key != NULL);
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123
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124 buf_putstring(buf, SSH_SIGNKEY_ED25519, SSH_SIGNKEY_ED25519_LEN);
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125 buf_putint(buf, CURVE25519_LEN*2);
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126 buf_putbytes(buf, key->priv, CURVE25519_LEN);
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127 buf_putbytes(buf, key->pub, CURVE25519_LEN);
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128
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129 TRACE(("leave buf_put_ed25519_priv_key"))
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130 }
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131
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132 /* Sign the data presented with key, writing the signature contents
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133 * to the buffer */
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134 void buf_put_ed25519_sign(buffer* buf, const dropbear_ed25519_key *key, const buffer *data_buf) {
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135
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136 unsigned char s[64];
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137 unsigned long slen = sizeof(s);
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138
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139 TRACE(("enter buf_put_ed25519_sign"))
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140 dropbear_assert(key != NULL);
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141
1707
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142 dropbear_ed25519_sign(data_buf->data, data_buf->len, s, &slen, key->priv, key->pub);
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143 buf_putstring(buf, SSH_SIGNKEY_ED25519, SSH_SIGNKEY_ED25519_LEN);
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144 buf_putstring(buf, s, slen);
1659
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145
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146 TRACE(("leave buf_put_ed25519_sign"))
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147 }
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148
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149 #if DROPBEAR_SIGNKEY_VERIFY
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150 /* Verify a signature in buf, made on data by the key given.
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151 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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152 int buf_ed25519_verify(buffer *buf, const dropbear_ed25519_key *key, const buffer *data_buf) {
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153
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154 int ret = DROPBEAR_FAILURE;
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155 unsigned char *s;
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156 unsigned long slen;
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157
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158 TRACE(("enter buf_ed25519_verify"))
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159 dropbear_assert(key != NULL);
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160
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161 slen = buf_getint(buf);
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162 if (slen != 64 || buf->len - buf->pos < slen) {
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163 TRACE(("bad size"))
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164 goto out;
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165 }
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166 s = buf_getptr(buf, slen);
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167
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168 if (dropbear_ed25519_verify(data_buf->data, data_buf->len,
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169 s, slen, key->pub) == 0) {
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170 /* signature is valid */
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171 TRACE(("success!"))
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172 ret = DROPBEAR_SUCCESS;
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173 }
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174
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175 out:
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176 TRACE(("leave buf_ed25519_verify: ret %d", ret))
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177 return ret;
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178 }
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179
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180 #endif /* DROPBEAR_SIGNKEY_VERIFY */
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181
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182 #endif /* DROPBEAR_ED25519 */