Mercurial > dropbear

annotate buffer.c @ 12:7a37cff27258

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merge of a585c2284e9ad17bfe6c6fd8f18b1c5042b2df47 and e3f735bb16fbd5cfb6bcad70885550c1b79b874c
author Matt Johnston <matt@ucc.asn.au>
date Thu, 03 Jun 2004 17:29:17 +0000
parents fe6bca95afa7
children b0316ce64e4b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4
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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 /* 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, > 5000 bit */
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38 #define BUF_MAX_MPINT (5000 / 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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48
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49 buf = (buffer*)m_malloc(sizeof(buffer));
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50
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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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56
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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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60
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61 return buf;
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62
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63 }
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64
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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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71
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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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74
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75 m_burn(buf->data, buf->size);
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76
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77 }
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78
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79 /* resize a buffer, pos and len will be repositioned if required */
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80 void buf_resize(buffer *buf, unsigned int newsize) {
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81
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82 if (newsize > BUF_MAX_SIZE) {
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83 dropbear_exit("buf->size too big");
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84 }
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85
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86 buf->data = m_realloc(buf->data, newsize);
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87 buf->size = newsize;
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88 buf->len = MIN(newsize, buf->len);
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89 buf->pos = MIN(newsize, buf->pos);
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90
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91 }
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92
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93 /* Create a copy of buf, allocating required memory etc. */
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94 /* The new buffer is sized the same as the length of the source buffer. */
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95 buffer* buf_newcopy(buffer* buf) {
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96
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97 buffer* ret;
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98
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99 ret = buf_new(buf->len);
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100 ret->len = buf->len;
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101 memcpy(ret->data, buf->data, buf->len);
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102 return ret;
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103 }
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104
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105 /* Set the length of the buffer */
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106 void buf_setlen(buffer* buf, unsigned int len) {
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107 if (len > buf->size) {
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108 dropbear_exit("bad buf_setlen");
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109 }
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110 buf->len = len;
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111 }
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112
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113 /* Increment the length of the buffer */
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114 void buf_incrlen(buffer* buf, unsigned int incr) {
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115 if (incr > BUF_MAX_INCR || buf->len + incr > buf->size) {
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116 dropbear_exit("bad buf_incrlen");
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117 }
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118 buf->len += incr;
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119 }
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120 /* Set the position of the buffer */
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121 void buf_setpos(buffer* buf, unsigned int pos) {
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122
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123 if (pos > buf->len) {
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124 dropbear_exit("bad buf_setpos");
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125 }
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126 buf->pos = pos;
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127 }
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128
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129 /* increment the postion by incr, increasing the buffer length if required */
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130 void buf_incrwritepos(buffer* buf, unsigned int incr) {
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131 if (incr > BUF_MAX_INCR || buf->pos + incr > buf->size) {
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132 dropbear_exit("bad buf_incrwritepos");
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133 }
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134 buf->pos += incr;
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135 if (buf->pos > buf->len) {
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136 buf->len = buf->pos;
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137 }
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138 }
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139
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140 /* increment the position by incr, negative values are allowed, to
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141 * decrement the pos*/
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142 void buf_incrpos(buffer* buf, int incr) {
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143 if (incr > BUF_MAX_INCR ||
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144 (unsigned int)((int)buf->pos + incr) > buf->len
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145 || ((int)buf->pos + incr) < 0) {
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146 dropbear_exit("bad buf_incrpos");
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147 }
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148 buf->pos += incr;
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149 }
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150
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151 /* Get a byte from the buffer and increment the pos */
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152 unsigned char buf_getbyte(buffer* buf) {
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153
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154 if (buf->pos >= buf->len) {
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155 dropbear_exit("bad buf_getbyte");
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156 }
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157 return buf->data[buf->pos++];
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158 }
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159
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160 /* put a byte, incrementing the length if required */
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161 void buf_putbyte(buffer* buf, unsigned char val) {
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162
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163 if (buf->pos >= buf->len) {
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164 buf_incrlen(buf, 1);
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165 }
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166 buf->data[buf->pos] = val;
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167 buf->pos++;
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168 }
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169
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170 /* returns an in-place pointer to the buffer, checking that
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171 * the next len bytes from that position can be used */
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172 unsigned char* buf_getptr(buffer* buf, unsigned int len) {
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173
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174 if (buf->pos + len > buf->len) {
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175 dropbear_exit("bad buf_getptr");
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176 }
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177 return &buf->data[buf->pos];
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178 }
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179
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180 /* like buf_getptr, but checks against total size, not used length.
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181 * This allows writing past the used length, but not past the size */
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182 unsigned char* buf_getwriteptr(buffer* buf, unsigned int len) {
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183
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184 if (buf->pos + len > buf->size) {
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185 dropbear_exit("bad buf_getwriteptr");
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186 }
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187 return &buf->data[buf->pos];
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188 }
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189
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190 /* Return a null-terminated string, it is malloced, so must be free()ed
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191 * Note that the string isn't checked for null bytes, hence the retlen
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192 * may be longer than what is returned by strlen */
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193 unsigned char* buf_getstring(buffer* buf, unsigned int *retlen) {
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194
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195 unsigned int len;
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196 unsigned char* ret;
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197 len = buf_getint(buf);
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198 if (len > MAX_STRING_LEN) {
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199 dropbear_exit("string too long");
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200 }
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201
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202 if (retlen != NULL) {
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203 *retlen = len;
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204 }
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205 ret = m_malloc(len+1);
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206 memcpy(ret, buf_getptr(buf, len), len);
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207 buf_incrpos(buf, len);
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208 ret[len] = '\0';
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209
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210 return ret;
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211 }
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212
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213 /* Just increment the buffer position the same as if we'd used buf_getstring,
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214 * but don't bother copying/malloc()ing for it */
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215 void buf_eatstring(buffer *buf) {
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216
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217 buf_incrpos( buf, buf_getint(buf) );
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218 }
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219
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220 /* Get an uint32 from the buffer and increment the pos */
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221 unsigned int buf_getint(buffer* buf) {
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222 unsigned int ret;
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223
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224 LOAD32H(ret, buf_getptr(buf, 4));
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225 buf_incrpos(buf, 4);
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226 return ret;
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227 }
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228
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229 /* put a 32bit uint into the buffer, incr bufferlen & pos if required */
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230 void buf_putint(buffer* buf, int unsigned val) {
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231
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232 STORE32H(val, buf_getwriteptr(buf, 4));
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233 buf_incrwritepos(buf, 4);
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234
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235 }
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236
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237 /* put a SSH style string into the buffer, increasing buffer len if required */
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238 void buf_putstring(buffer* buf, const unsigned char* str, unsigned int len) {
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239
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240 buf_putint(buf, len);
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241 buf_putbytes(buf, str, len);
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242
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243 }
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244
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245 /* put the set of len bytes into the buffer, incrementing the pos, increasing
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246 * len if required */
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247 void buf_putbytes(buffer *buf, const unsigned char *bytes, unsigned int len) {
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248 memcpy(buf_getwriteptr(buf, len), bytes, len);
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249 buf_incrwritepos(buf, len);
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250 }
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251
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252
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253 /* for our purposes we only need positive (or 0) numbers, so will
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254 * fail if we get negative numbers */
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255 void buf_putmpint(buffer* buf, mp_int * mp) {
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256
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257 unsigned int len, pad = 0;
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258 TRACE(("enter buf_putmpint"));
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259
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260 assert(mp != NULL);
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261
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262 if (SIGN(mp) == MP_NEG) {
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263 dropbear_exit("negative bignum");
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264 }
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265
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266 /* zero check */
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267 if (USED(mp) == 1 && DIGIT(mp, 0) == 0) {
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268 len = 0;
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269 } else {
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270 /* SSH spec requires padding for mpints with the MSB set, this code
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271 * implements it */
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272 len = mp_count_bits(mp);
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273 /* if the top bit of MSB is set, we need to pad */
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274 pad = (len%8 == 0) ? 1 : 0;
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275 len = len / 8 + 1; /* don't worry about rounding, we need it for
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276 padding anyway when len%8 == 0 */
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277
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278 }
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279
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280 /* store the length */
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281 buf_putint(buf, len);
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282
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283 /* store the actual value */
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284 if (len > 0) {
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285 if (pad) {
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286 buf_putbyte(buf, 0x00);
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287 }
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288 if (mp_to_unsigned_bin(mp, buf_getwriteptr(buf, len-pad)) != MP_OKAY) {
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289 dropbear_exit("mpint error");
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290 }
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291 buf_incrwritepos(buf, len-pad);
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292 }
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293
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294 TRACE(("leave buf_putmpint"));
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295 }
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296
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297 /* Retrieve an mp_int from the buffer.
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298 * Will fail for -ve since they shouldn't be required here.
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299 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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300 int buf_getmpint(buffer* buf, mp_int* mp) {
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301
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302 unsigned int len;
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303 len = buf_getint(buf);
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304
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305 if (len == 0) {
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306 mp_zero(mp);
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307 return DROPBEAR_SUCCESS;
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308 }
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309
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310 if (len > BUF_MAX_MPINT) {
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311 return DROPBEAR_FAILURE;
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312 }
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313
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314 /* check for negative */
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315 if (*buf_getptr(buf, 1) & (1 << (CHAR_BIT-1))) {
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316 return DROPBEAR_FAILURE;
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317 }
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318
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319 if (mp_read_unsigned_bin(mp, buf_getptr(buf, len), len) != MP_OKAY) {
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320 return DROPBEAR_FAILURE;
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321 }
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322
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323 buf_incrpos(buf, len);
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324 return DROPBEAR_SUCCESS;
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325 }