Mercurial > dropbear

annotate buffer.c @ 816:84e4259dae3e

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author Matt Johnston <matt@ucc.asn.au>
date Sat, 21 Sep 2013 00:34:36 +0800
parents 9a5438271556
children 7dcb46da72d9
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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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39
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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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49 buf = (buffer*)m_malloc(sizeof(buffer));
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51 if (size > 0) {
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52 buf->data = (unsigned char*)m_malloc(size);
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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 buf->pos = 0;
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59 buf->len = 0;
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61 return buf;
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62
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63 }
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65 /* free the buffer's data and the buffer itself */
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66 void buf_free(buffer* buf) {
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67
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68 m_free(buf->data)
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69 m_free(buf);
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70 }
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72 /* overwrite the contents of the buffer to clear it */
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73 void buf_burn(buffer* buf) {
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75 m_burn(buf->data, buf->size);
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77 }
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79 /* resize a buffer, pos and len will be repositioned if required when
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80 * downsizing */
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81 void buf_resize(buffer *buf, unsigned int newsize) {
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82
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83 if (newsize > BUF_MAX_SIZE) {
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84 dropbear_exit("buf->size too big");
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85 }
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87 buf->data = m_realloc(buf->data, newsize);
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88 buf->size = newsize;
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89 buf->len = MIN(newsize, buf->len);
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90 buf->pos = MIN(newsize, buf->pos);
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92 }
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93
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94 /* Create a copy of buf, allocating required memory etc. */
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95 /* The new buffer is sized the same as the length of the source buffer. */
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96 buffer* buf_newcopy(buffer* buf) {
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97
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98 buffer* ret;
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99
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100 ret = buf_new(buf->len);
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101 ret->len = buf->len;
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102 memcpy(ret->data, buf->data, buf->len);
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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 }
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113
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114 /* Increment the length of the buffer */
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115 void buf_incrlen(buffer* buf, unsigned int incr) {
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116 if (incr > BUF_MAX_INCR || buf->len + incr > buf->size) {
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117 dropbear_exit("Bad buf_incrlen");
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118 }
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119 buf->len += incr;
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120 }
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121 /* Set the position of the buffer */
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122 void buf_setpos(buffer* buf, unsigned int pos) {
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123
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124 if (pos > buf->len) {
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125 dropbear_exit("Bad buf_setpos");
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126 }
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127 buf->pos = pos;
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128 }
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129
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130 /* increment the postion by incr, increasing the buffer length if required */
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131 void buf_incrwritepos(buffer* buf, unsigned int incr) {
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132 if (incr > BUF_MAX_INCR || buf->pos + incr > buf->size) {
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133 dropbear_exit("Bad buf_incrwritepos");
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134 }
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135 buf->pos += incr;
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136 if (buf->pos > buf->len) {
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137 buf->len = buf->pos;
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138 }
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139 }
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140
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141 /* increment the position by incr, negative values are allowed, to
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142 * decrement the pos*/
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143 void buf_incrpos(buffer* buf, int incr) {
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144 if (incr > BUF_MAX_INCR ||
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145 (unsigned int)((int)buf->pos + incr) > buf->len
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146 || ((int)buf->pos + incr) < 0) {
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147 dropbear_exit("Bad buf_incrpos");
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148 }
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149 buf->pos += incr;
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150 }
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151
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152 /* Get a byte from the buffer and increment the pos */
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153 unsigned char buf_getbyte(buffer* buf) {
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154
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155 /* This check is really just ==, but the >= allows us to check for the
241
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156 * bad case of pos > len, which should _never_ happen. */
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157 if (buf->pos >= buf->len) {
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158 dropbear_exit("Bad buf_getbyte");
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159 }
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160 return buf->data[buf->pos++];
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161 }
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162
179
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163 /* Get a bool from the buffer and increment the pos */
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164 unsigned char buf_getbool(buffer* buf) {
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165
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166 unsigned char b;
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167 b = buf_getbyte(buf);
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168 if (b != 0)
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169 b = 1;
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170 return b;
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171 }
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172
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173 /* put a byte, incrementing the length if required */
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174 void buf_putbyte(buffer* buf, unsigned char val) {
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175
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176 if (buf->pos >= buf->len) {
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177 buf_incrlen(buf, 1);
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178 }
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179 buf->data[buf->pos] = val;
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180 buf->pos++;
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181 }
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182
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183 /* returns an in-place pointer to the buffer, checking that
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184 * the next len bytes from that position can be used */
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185 unsigned char* buf_getptr(buffer* buf, unsigned int len) {
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186
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187 if (buf->pos + len > buf->len) {
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188 dropbear_exit("Bad buf_getptr");
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189 }
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190 return &buf->data[buf->pos];
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191 }
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192
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193 /* like buf_getptr, but checks against total size, not used length.
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194 * This allows writing past the used length, but not past the size */
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195 unsigned char* buf_getwriteptr(buffer* buf, unsigned int len) {
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196
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197 if (buf->pos + len > buf->size) {
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198 dropbear_exit("Bad buf_getwriteptr");
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199 }
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200 return &buf->data[buf->pos];
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201 }
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202
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203 /* Return a null-terminated string, it is malloced, so must be free()ed
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204 * Note that the string isn't checked for null bytes, hence the retlen
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205 * may be longer than what is returned by strlen */
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206 unsigned char* buf_getstring(buffer* buf, unsigned int *retlen) {
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207
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208 unsigned int len;
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209 unsigned char* ret;
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210 len = buf_getint(buf);
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211 if (len > MAX_STRING_LEN) {
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212 dropbear_exit("String too long");
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213 }
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214
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215 if (retlen != NULL) {
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216 *retlen = len;
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217 }
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218 ret = m_malloc(len+1);
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219 memcpy(ret, buf_getptr(buf, len), len);
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220 buf_incrpos(buf, len);
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221 ret[len] = '\0';
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222
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223 return ret;
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224 }
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225
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226 /* Return a string as a newly allocated buffer */
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227 buffer * buf_getstringbuf(buffer *buf) {
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228 buffer *ret;
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229 unsigned char* str;
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230 unsigned int len;
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231 str = buf_getstring(buf, &len);
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232 ret = m_malloc(sizeof(*ret));
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233 ret->data = str;
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234 ret->len = len;
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235 ret->size = len;
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236 ret->pos = 0;
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237 return ret;
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238 }
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239
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240 /* Just increment the buffer position the same as if we'd used buf_getstring,
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241 * but don't bother copying/malloc()ing for it */
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242 void buf_eatstring(buffer *buf) {
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243
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244 buf_incrpos( buf, buf_getint(buf) );
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245 }
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246
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247 /* Get an uint32 from the buffer and increment the pos */
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248 unsigned int buf_getint(buffer* buf) {
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249 unsigned int ret;
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250
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251 LOAD32H(ret, buf_getptr(buf, 4));
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252 buf_incrpos(buf, 4);
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253 return ret;
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254 }
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255
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256 /* put a 32bit uint into the buffer, incr bufferlen & pos if required */
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257 void buf_putint(buffer* buf, int unsigned val) {
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258
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259 STORE32H(val, buf_getwriteptr(buf, 4));
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260 buf_incrwritepos(buf, 4);
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261
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262 }
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263
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264 /* put a SSH style string into the buffer, increasing buffer len if required */
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265 void buf_putstring(buffer* buf, const unsigned char* str, unsigned int len) {
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266
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267 buf_putint(buf, len);
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268 buf_putbytes(buf, str, len);
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269
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270 }
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271
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272 /* put the set of len bytes into the buffer, incrementing the pos, increasing
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273 * len if required */
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274 void buf_putbytes(buffer *buf, const unsigned char *bytes, unsigned int len) {
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275 memcpy(buf_getwriteptr(buf, len), bytes, len);
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276 buf_incrwritepos(buf, len);
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277 }
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278
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279
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280 /* for our purposes we only need positive (or 0) numbers, so will
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281 * fail if we get negative numbers */
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282 void buf_putmpint(buffer* buf, mp_int * mp) {
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283
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284 unsigned int len, pad = 0;
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285 TRACE2(("enter buf_putmpint"))
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286
241
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diff changeset
287 dropbear_assert(mp != NULL);
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288
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289 if (SIGN(mp) == MP_NEG) {
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290 dropbear_exit("negative bignum");
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291 }
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292
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293 /* zero check */
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294 if (USED(mp) == 1 && DIGIT(mp, 0) == 0) {
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295 len = 0;
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296 } else {
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297 /* SSH spec requires padding for mpints with the MSB set, this code
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298 * implements it */
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299 len = mp_count_bits(mp);
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300 /* if the top bit of MSB is set, we need to pad */
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301 pad = (len%8 == 0) ? 1 : 0;
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302 len = len / 8 + 1; /* don't worry about rounding, we need it for
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303 padding anyway when len%8 == 0 */
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304
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305 }
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306
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307 /* store the length */
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308 buf_putint(buf, len);
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309
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310 /* store the actual value */
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311 if (len > 0) {
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312 if (pad) {
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313 buf_putbyte(buf, 0x00);
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314 }
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315 if (mp_to_unsigned_bin(mp, buf_getwriteptr(buf, len-pad)) != MP_OKAY) {
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316 dropbear_exit("mpint error");
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317 }
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318 buf_incrwritepos(buf, len-pad);
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319 }
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320
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
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321 TRACE2(("leave buf_putmpint"))
4
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322 }
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323
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324 /* Retrieve an mp_int from the buffer.
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325 * Will fail for -ve since they shouldn't be required here.
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326 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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327 int buf_getmpint(buffer* buf, mp_int* mp) {
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328
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329 unsigned int len;
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330 len = buf_getint(buf);
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331
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332 if (len == 0) {
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333 mp_zero(mp);
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334 return DROPBEAR_SUCCESS;
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335 }
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336
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337 if (len > BUF_MAX_MPINT) {
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338 return DROPBEAR_FAILURE;
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339 }
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340
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341 /* check for negative */
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342 if (*buf_getptr(buf, 1) & (1 << (CHAR_BIT-1))) {
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343 return DROPBEAR_FAILURE;
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344 }
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345
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346 if (mp_read_unsigned_bin(mp, buf_getptr(buf, len), len) != MP_OKAY) {
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347 return DROPBEAR_FAILURE;
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348 }
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349
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350 buf_incrpos(buf, len);
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351 return DROPBEAR_SUCCESS;
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352 }