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annotate buffer.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
parents 5916af64acd4
children d5cdc60db08e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Dropbear SSH
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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 /* Buffer handling routines, designed to avoid overflows/using invalid data */
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26
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27 #include "includes.h"
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28 #include "dbutil.h"
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29 #include "buffer.h"
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30
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31 /* Prevent integer overflows when incrementing buffer position/length.
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32 * Calling functions should check arguments first, but this provides a
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33 * backstop */
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34 #define BUF_MAX_INCR 1000000000
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35 #define BUF_MAX_SIZE 1000000000
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36
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37 /* avoid excessively large numbers, > ~8192 bits */
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38 #define BUF_MAX_MPINT (8240 / 8)
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40 /* Create (malloc) a new buffer of size */
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41 buffer* buf_new(unsigned int size) {
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42
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43 buffer* buf;
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44
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45 if (size > BUF_MAX_SIZE) {
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46 dropbear_exit("buf->size too big");
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47 }
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48
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49 buf = (buffer*)m_malloc(sizeof(buffer)+size);
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51 if (size > 0) {
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52 buf->data = (unsigned char*)buf + sizeof(buffer);
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53 } else {
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54 buf->data = NULL;
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55 }
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57 buf->size = size;
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58
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59 return buf;
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61 }
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63 /* free the buffer's data and the buffer itself */
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64 void buf_free(buffer* buf) {
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65
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66 m_free(buf);
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67 }
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69 /* overwrite the contents of the buffer to clear it */
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70 void buf_burn(const buffer* buf) {
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72 m_burn(buf->data, buf->size);
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74 }
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75
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76 /* resize a buffer, pos and len will be repositioned if required when
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77 * downsizing */
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78 buffer* buf_resize(buffer *buf, unsigned int newsize) {
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80 if (newsize > BUF_MAX_SIZE) {
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81 dropbear_exit("buf->size too big");
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82 }
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83
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84 buf = m_realloc(buf, sizeof(buffer)+newsize);
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85 buf->data = (unsigned char*)buf + sizeof(buffer);
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86 buf->size = newsize;
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87 buf->len = MIN(newsize, buf->len);
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88 buf->pos = MIN(newsize, buf->pos);
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89 return buf;
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90 }
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91
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92 /* Create a copy of buf, allocating required memory etc. */
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93 /* The new buffer is sized the same as the length of the source buffer. */
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94 buffer* buf_newcopy(const buffer* buf) {
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95
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96 buffer* ret;
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97
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98 ret = buf_new(buf->len);
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99 ret->len = buf->len;
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100 if (buf->len > 0) {
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101 memcpy(ret->data, buf->data, buf->len);
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102 }
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103 return ret;
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104 }
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105
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106 /* Set the length of the buffer */
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107 void buf_setlen(buffer* buf, unsigned int len) {
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108 if (len > buf->size) {
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109 dropbear_exit("Bad buf_setlen");
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110 }
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111 buf->len = len;
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112 buf->pos = MIN(buf->pos, buf->len);
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113 }
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115 /* Increment the length of the buffer */
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116 void buf_incrlen(buffer* buf, unsigned int incr) {
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117 if (incr > BUF_MAX_INCR || buf->len + incr > buf->size) {
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118 dropbear_exit("Bad buf_incrlen");
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119 }
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120 buf->len += incr;
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121 }
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122 /* Set the position of the buffer */
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123 void buf_setpos(buffer* buf, unsigned int pos) {
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124
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125 if (pos > buf->len) {
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126 dropbear_exit("Bad buf_setpos");
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127 }
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128 buf->pos = pos;
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129 }
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130
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131 /* increment the position by incr, increasing the buffer length if required */
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132 void buf_incrwritepos(buffer* buf, unsigned int incr) {
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133 if (incr > BUF_MAX_INCR || buf->pos + incr > buf->size) {
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134 dropbear_exit("Bad buf_incrwritepos");
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135 }
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136 buf->pos += incr;
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137 if (buf->pos > buf->len) {
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138 buf->len = buf->pos;
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139 }
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140 }
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141
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142 /* increment the position by incr, negative values are allowed, to
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143 * decrement the pos*/
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144 void buf_incrpos(buffer* buf, int incr) {
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145 if (incr > BUF_MAX_INCR
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146 || incr < -BUF_MAX_INCR
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147 || (unsigned int)((int)buf->pos + incr) > buf->len
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148 || ((int)buf->pos + incr) < 0) {
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149 dropbear_exit("Bad buf_incrpos");
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150 }
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151 buf->pos += incr;
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152 }
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153
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154 /* Get a byte from the buffer and increment the pos */
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155 unsigned char buf_getbyte(buffer* buf) {
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156
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b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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157 /* This check is really just ==, but the >= allows us to check for the
241
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158 * bad case of pos > len, which should _never_ happen. */
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159 if (buf->pos >= buf->len) {
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160 dropbear_exit("Bad buf_getbyte");
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161 }
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162 return buf->data[buf->pos++];
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163 }
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164
179
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165 /* Get a bool from the buffer and increment the pos */
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166 unsigned char buf_getbool(buffer* buf) {
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167
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168 unsigned char b;
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169 b = buf_getbyte(buf);
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170 if (b != 0)
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171 b = 1;
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172 return b;
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173 }
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174
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175 /* put a byte, incrementing the length if required */
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176 void buf_putbyte(buffer* buf, unsigned char val) {
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177
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178 if (buf->pos >= buf->len) {
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179 buf_incrlen(buf, 1);
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180 }
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181 buf->data[buf->pos] = val;
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182 buf->pos++;
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183 }
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184
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185 /* returns an in-place pointer to the buffer, checking that
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186 * the next len bytes from that position can be used */
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187 unsigned char* buf_getptr(const buffer* buf, unsigned int len) {
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188
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189 if (len > BUF_MAX_INCR || buf->pos + len > buf->len) {
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190 dropbear_exit("Bad buf_getptr");
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191 }
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192 return &buf->data[buf->pos];
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193 }
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194
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195 /* like buf_getptr, but checks against total size, not used length.
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196 * This allows writing past the used length, but not past the size */
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197 unsigned char* buf_getwriteptr(const buffer* buf, unsigned int len) {
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198
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199 if (len > BUF_MAX_INCR || buf->pos + len > buf->size) {
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200 dropbear_exit("Bad buf_getwriteptr");
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201 }
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202 return &buf->data[buf->pos];
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203 }
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204
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205 /* Return a null-terminated string, it is malloced, so must be free()ed
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206 * Note that the string isn't checked for null bytes, hence the retlen
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207 * may be longer than what is returned by strlen */
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208 char* buf_getstring(buffer* buf, unsigned int *retlen) {
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209
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210 unsigned int len;
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211 char* ret;
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212 void* src = NULL;
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213 len = buf_getint(buf);
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214 if (len > MAX_STRING_LEN) {
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215 dropbear_exit("String too long");
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216 }
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217
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218 if (retlen != NULL) {
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219 *retlen = len;
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220 }
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221 src = buf_getptr(buf, len);
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222 ret = m_malloc(len+1);
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223 memcpy(ret, src, len);
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224 buf_incrpos(buf, len);
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225 ret[len] = '\0';
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226
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227 return ret;
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228 }
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229
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230 /* Return a string as a newly allocated buffer */
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231 buffer * buf_getstringbuf(buffer *buf) {
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232 buffer *ret = NULL;
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233 unsigned int len = buf_getint(buf);
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234 if (len > MAX_STRING_LEN) {
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235 dropbear_exit("String too long");
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236 }
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237 ret = buf_new(len);
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238 memcpy(buf_getwriteptr(ret, len), buf_getptr(buf, len), len);
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239 buf_incrpos(buf, len);
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240 buf_incrlen(ret, len);
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241 return ret;
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242 }
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243
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244 /* Just increment the buffer position the same as if we'd used buf_getstring,
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245 * but don't bother copying/malloc()ing for it */
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246 void buf_eatstring(buffer *buf) {
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247
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248 buf_incrpos( buf, buf_getint(buf) );
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249 }
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250
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251 /* Get an uint32 from the buffer and increment the pos */
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252 unsigned int buf_getint(buffer* buf) {
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253 unsigned int ret;
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254
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255 LOAD32H(ret, buf_getptr(buf, 4));
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256 buf_incrpos(buf, 4);
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257 return ret;
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258 }
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259
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260 /* put a 32bit uint into the buffer, incr bufferlen & pos if required */
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261 void buf_putint(buffer* buf, int unsigned val) {
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262
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263 STORE32H(val, buf_getwriteptr(buf, 4));
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264 buf_incrwritepos(buf, 4);
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265
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266 }
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267
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268 /* put a SSH style string into the buffer, increasing buffer len if required */
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269 void buf_putstring(buffer* buf, const char* str, unsigned int len) {
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270
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271 buf_putint(buf, len);
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272 buf_putbytes(buf, (const unsigned char*)str, len);
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273
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274 }
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275
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276 /* puts an entire buffer as a SSH string. ignore pos of buf_str. */
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277 void buf_putbufstring(buffer *buf, const buffer* buf_str) {
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278 buf_putstring(buf, (const char*)buf_str->data, buf_str->len);
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279 }
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280
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281 /* put the set of len bytes into the buffer, incrementing the pos, increasing
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282 * len if required */
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283 void buf_putbytes(buffer *buf, const unsigned char *bytes, unsigned int len) {
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284 memcpy(buf_getwriteptr(buf, len), bytes, len);
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285 buf_incrwritepos(buf, len);
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286 }
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287
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288
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289 /* for our purposes we only need positive (or 0) numbers, so will
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290 * fail if we get negative numbers */
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291 void buf_putmpint(buffer* buf, mp_int * mp) {
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292
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293 unsigned int len, pad = 0;
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294 TRACE2(("enter buf_putmpint"))
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295
241
c5d3ef11155f * use own assertions which should get logged properly
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296 dropbear_assert(mp != NULL);
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297
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298 if (SIGN(mp) == MP_NEG) {
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299 dropbear_exit("negative bignum");
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300 }
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301
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302 /* zero check */
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303 if (USED(mp) == 1 && DIGIT(mp, 0) == 0) {
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304 len = 0;
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305 } else {
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306 /* SSH spec requires padding for mpints with the MSB set, this code
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307 * implements it */
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308 len = mp_count_bits(mp);
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309 /* if the top bit of MSB is set, we need to pad */
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310 pad = (len%8 == 0) ? 1 : 0;
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311 len = len / 8 + 1; /* don't worry about rounding, we need it for
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312 padding anyway when len%8 == 0 */
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313
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314 }
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315
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316 /* store the length */
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317 buf_putint(buf, len);
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318
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319 /* store the actual value */
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320 if (len > 0) {
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321 if (pad) {
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322 buf_putbyte(buf, 0x00);
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323 }
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324 if (mp_to_unsigned_bin(mp, buf_getwriteptr(buf, len-pad)) != MP_OKAY) {
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325 dropbear_exit("mpint error");
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326 }
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327 buf_incrwritepos(buf, len-pad);
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328 }
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329
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
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330 TRACE2(("leave buf_putmpint"))
4
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331 }
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332
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333 /* Retrieve an mp_int from the buffer.
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334 * Will fail for -ve since they shouldn't be required here.
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335 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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336 int buf_getmpint(buffer* buf, mp_int* mp) {
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337
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338 unsigned int len;
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339 len = buf_getint(buf);
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340
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341 if (len == 0) {
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342 mp_zero(mp);
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343 return DROPBEAR_SUCCESS;
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344 }
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345
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346 if (len > BUF_MAX_MPINT) {
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347 return DROPBEAR_FAILURE;
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348 }
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349
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350 /* check for negative */
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351 if (*buf_getptr(buf, 1) & (1 << (CHAR_BIT-1))) {
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352 return DROPBEAR_FAILURE;
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353 }
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354
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355 if (mp_read_unsigned_bin(mp, buf_getptr(buf, len), len) != MP_OKAY) {
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356 return DROPBEAR_FAILURE;
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357 }
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358
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359 buf_incrpos(buf, len);
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360 return DROPBEAR_SUCCESS;
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361 }