Mercurial > dropbear

annotate ed25519.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 41a0ff8d5a89
children 93dcc97c3f3f
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 /* 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 */