Mercurial > dropbear
annotate buffer.c @ 76:95f4bc4bcd58
- It'll be called 0.44test1
- Debian stuff
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 14 Aug 2004 18:03:36 +0000 |
parents | b0316ce64e4b |
children | 10f4d3319780 |
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 /* 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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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 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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86 |
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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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91 |
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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 |
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156 * assert()able 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 |
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163 /* put a byte, incrementing the length if required */ |
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164 void buf_putbyte(buffer* buf, unsigned char val) { |
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165 |
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166 if (buf->pos >= buf->len) { |
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167 buf_incrlen(buf, 1); |
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168 } |
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169 buf->data[buf->pos] = val; |
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170 buf->pos++; |
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171 } |
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172 |
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173 /* returns an in-place pointer to the buffer, checking that |
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174 * the next len bytes from that position can be used */ |
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175 unsigned char* buf_getptr(buffer* buf, unsigned int len) { |
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176 |
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177 if (buf->pos + len > buf->len) { |
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178 dropbear_exit("bad buf_getptr"); |
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179 } |
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180 return &buf->data[buf->pos]; |
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181 } |
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182 |
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183 /* like buf_getptr, but checks against total size, not used length. |
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184 * This allows writing past the used length, but not past the size */ |
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185 unsigned char* buf_getwriteptr(buffer* buf, unsigned int len) { |
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186 |
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187 if (buf->pos + len > buf->size) { |
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188 dropbear_exit("bad buf_getwriteptr"); |
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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 /* Return a null-terminated string, it is malloced, so must be free()ed |
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194 * Note that the string isn't checked for null bytes, hence the retlen |
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195 * may be longer than what is returned by strlen */ |
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196 unsigned char* buf_getstring(buffer* buf, unsigned int *retlen) { |
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197 |
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198 unsigned int len; |
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199 unsigned char* ret; |
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200 len = buf_getint(buf); |
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201 if (len > MAX_STRING_LEN) { |
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202 dropbear_exit("string too long"); |
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203 } |
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204 |
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205 if (retlen != NULL) { |
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206 *retlen = len; |
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207 } |
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208 ret = m_malloc(len+1); |
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209 memcpy(ret, buf_getptr(buf, len), len); |
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210 buf_incrpos(buf, len); |
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211 ret[len] = '\0'; |
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212 |
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213 return ret; |
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214 } |
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215 |
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216 /* Just increment the buffer position the same as if we'd used buf_getstring, |
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217 * but don't bother copying/malloc()ing for it */ |
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218 void buf_eatstring(buffer *buf) { |
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219 |
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220 buf_incrpos( buf, buf_getint(buf) ); |
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221 } |
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222 |
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223 /* Get an uint32 from the buffer and increment the pos */ |
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224 unsigned int buf_getint(buffer* buf) { |
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225 unsigned int ret; |
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226 |
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227 LOAD32H(ret, buf_getptr(buf, 4)); |
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228 buf_incrpos(buf, 4); |
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229 return ret; |
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230 } |
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231 |
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232 /* put a 32bit uint into the buffer, incr bufferlen & pos if required */ |
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233 void buf_putint(buffer* buf, int unsigned val) { |
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234 |
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235 STORE32H(val, buf_getwriteptr(buf, 4)); |
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236 buf_incrwritepos(buf, 4); |
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237 |
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238 } |
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239 |
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240 /* put a SSH style string into the buffer, increasing buffer len if required */ |
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241 void buf_putstring(buffer* buf, const unsigned char* str, unsigned int len) { |
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242 |
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243 buf_putint(buf, len); |
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244 buf_putbytes(buf, str, len); |
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245 |
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246 } |
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247 |
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248 /* put the set of len bytes into the buffer, incrementing the pos, increasing |
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249 * len if required */ |
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250 void buf_putbytes(buffer *buf, const unsigned char *bytes, unsigned int len) { |
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251 memcpy(buf_getwriteptr(buf, len), bytes, len); |
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252 buf_incrwritepos(buf, len); |
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253 } |
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254 |
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255 |
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256 /* for our purposes we only need positive (or 0) numbers, so will |
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257 * fail if we get negative numbers */ |
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258 void buf_putmpint(buffer* buf, mp_int * mp) { |
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259 |
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260 unsigned int len, pad = 0; |
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261 TRACE(("enter buf_putmpint")); |
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262 |
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263 assert(mp != NULL); |
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264 |
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265 if (SIGN(mp) == MP_NEG) { |
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266 dropbear_exit("negative bignum"); |
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267 } |
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268 |
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269 /* zero check */ |
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270 if (USED(mp) == 1 && DIGIT(mp, 0) == 0) { |
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271 len = 0; |
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272 } else { |
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273 /* SSH spec requires padding for mpints with the MSB set, this code |
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274 * implements it */ |
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275 len = mp_count_bits(mp); |
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276 /* if the top bit of MSB is set, we need to pad */ |
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277 pad = (len%8 == 0) ? 1 : 0; |
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278 len = len / 8 + 1; /* don't worry about rounding, we need it for |
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279 padding anyway when len%8 == 0 */ |
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280 |
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281 } |
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282 |
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283 /* store the length */ |
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284 buf_putint(buf, len); |
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285 |
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286 /* store the actual value */ |
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287 if (len > 0) { |
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288 if (pad) { |
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289 buf_putbyte(buf, 0x00); |
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290 } |
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291 if (mp_to_unsigned_bin(mp, buf_getwriteptr(buf, len-pad)) != MP_OKAY) { |
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292 dropbear_exit("mpint error"); |
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293 } |
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294 buf_incrwritepos(buf, len-pad); |
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295 } |
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296 |
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297 TRACE(("leave buf_putmpint")); |
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298 } |
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299 |
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300 /* Retrieve an mp_int from the buffer. |
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301 * Will fail for -ve since they shouldn't be required here. |
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302 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
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303 int buf_getmpint(buffer* buf, mp_int* mp) { |
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304 |
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305 unsigned int len; |
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306 len = buf_getint(buf); |
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307 |
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308 if (len == 0) { |
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309 mp_zero(mp); |
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310 return DROPBEAR_SUCCESS; |
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311 } |
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312 |
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313 if (len > BUF_MAX_MPINT) { |
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314 return DROPBEAR_FAILURE; |
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315 } |
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316 |
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317 /* check for negative */ |
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318 if (*buf_getptr(buf, 1) & (1 << (CHAR_BIT-1))) { |
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319 return DROPBEAR_FAILURE; |
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320 } |
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321 |
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322 if (mp_read_unsigned_bin(mp, buf_getptr(buf, len), len) != MP_OKAY) { |
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323 return DROPBEAR_FAILURE; |
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324 } |
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325 |
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326 buf_incrpos(buf, len); |
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327 return DROPBEAR_SUCCESS; |
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328 } |