Mercurial > dropbear

annotate buffer.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 290caf301a4f
children 8b4274d34fe8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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 buffer* buf;
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43 if (size > BUF_MAX_SIZE) {
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44 dropbear_exit("buf->size too big");
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45 }
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46
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47 buf = (buffer*)m_malloc(sizeof(buffer)+size);
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48 buf->data = (unsigned char*)buf + sizeof(buffer);
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49 buf->size = size;
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50 return buf;
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51 }
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52
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53 /* free the buffer's data and the buffer itself */
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54 void buf_free(buffer* buf) {
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55 m_free(buf);
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56 }
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58 /* overwrite the contents of the buffer to clear it */
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59 void buf_burn(const buffer* buf) {
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60 m_burn(buf->data, buf->size);
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61 }
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63 /* resize a buffer, pos and len will be repositioned if required when
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64 * downsizing */
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65 buffer* buf_resize(buffer *buf, unsigned int newsize) {
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66 if (newsize > BUF_MAX_SIZE) {
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67 dropbear_exit("buf->size too big");
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68 }
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70 buf = m_realloc(buf, sizeof(buffer)+newsize);
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71 buf->data = (unsigned char*)buf + sizeof(buffer);
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72 buf->size = newsize;
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73 buf->len = MIN(newsize, buf->len);
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74 buf->pos = MIN(newsize, buf->pos);
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75 return buf;
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76 }
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78 /* Create a copy of buf, allocating required memory etc. */
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79 /* The new buffer is sized the same as the length of the source buffer. */
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80 buffer* buf_newcopy(const buffer* buf) {
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82 buffer* ret;
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83
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84 ret = buf_new(buf->len);
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85 ret->len = buf->len;
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86 if (buf->len > 0) {
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87 memcpy(ret->data, buf->data, buf->len);
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88 }
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89 return ret;
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90 }
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91
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92 /* Set the length of the buffer */
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93 void buf_setlen(buffer* buf, unsigned int len) {
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94 if (len > buf->size) {
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95 dropbear_exit("Bad buf_setlen");
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96 }
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97 buf->len = len;
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98 buf->pos = MIN(buf->pos, buf->len);
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99 }
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101 /* Increment the length of the buffer */
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102 void buf_incrlen(buffer* buf, unsigned int incr) {
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103 if (incr > BUF_MAX_INCR || buf->len + incr > buf->size) {
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104 dropbear_exit("Bad buf_incrlen");
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105 }
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106 buf->len += incr;
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107 }
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108 /* Set the position of the buffer */
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109 void buf_setpos(buffer* buf, unsigned int pos) {
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111 if (pos > buf->len) {
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112 dropbear_exit("Bad buf_setpos");
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113 }
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114 buf->pos = pos;
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115 }
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116
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117 /* increment the position by incr, increasing the buffer length if required */
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118 void buf_incrwritepos(buffer* buf, unsigned int incr) {
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119 if (incr > BUF_MAX_INCR || buf->pos + incr > buf->size) {
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120 dropbear_exit("Bad buf_incrwritepos");
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121 }
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122 buf->pos += incr;
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123 if (buf->pos > buf->len) {
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124 buf->len = buf->pos;
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125 }
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126 }
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127
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128 /* increment the position by incr */
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129 void buf_incrpos(buffer* buf, unsigned int incr) {
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130 if (incr > BUF_MAX_INCR
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131 || (buf->pos + incr) > buf->len) {
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132 dropbear_exit("Bad buf_incrpos");
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133 }
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134 buf->pos += incr;
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135 }
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136
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137 /* decrement the position by decr */
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138 void buf_decrpos(buffer* buf, unsigned int decr) {
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139 if (decr > buf->pos) {
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140 dropbear_exit("Bad buf_decrpos");
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141 }
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142 buf->pos -= decr;
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143 }
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144
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145 /* Get a byte from the buffer and increment the pos */
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146 unsigned char buf_getbyte(buffer* buf) {
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147
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148 /* This check is really just ==, but the >= allows us to check for the
241
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149 * bad case of pos > len, which should _never_ happen. */
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150 if (buf->pos >= buf->len) {
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151 dropbear_exit("Bad buf_getbyte");
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152 }
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153 return buf->data[buf->pos++];
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154 }
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155
179
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156 /* Get a bool from the buffer and increment the pos */
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157 unsigned char buf_getbool(buffer* buf) {
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158
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159 unsigned char b;
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160 b = buf_getbyte(buf);
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161 if (b != 0)
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162 b = 1;
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163 return b;
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164 }
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165
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166 /* put a byte, incrementing the length if required */
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167 void buf_putbyte(buffer* buf, unsigned char val) {
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168
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169 if (buf->pos >= buf->len) {
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170 buf_incrlen(buf, 1);
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171 }
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172 buf->data[buf->pos] = val;
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173 buf->pos++;
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174 }
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175
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176 /* returns an in-place pointer to the buffer, checking that
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177 * the next len bytes from that position can be used */
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178 unsigned char* buf_getptr(const buffer* buf, unsigned int len) {
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179
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180 if (len > BUF_MAX_INCR || buf->pos + len > buf->len) {
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181 dropbear_exit("Bad buf_getptr");
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182 }
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183 return &buf->data[buf->pos];
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184 }
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185
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186 /* like buf_getptr, but checks against total size, not used length.
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187 * This allows writing past the used length, but not past the size */
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188 unsigned char* buf_getwriteptr(const buffer* buf, unsigned int len) {
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189
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190 if (len > BUF_MAX_INCR || buf->pos + len > buf->size) {
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191 dropbear_exit("Bad buf_getwriteptr");
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192 }
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193 return &buf->data[buf->pos];
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194 }
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195
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196 /* Return a null-terminated string, it is malloced, so must be free()ed
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197 * Note that the string isn't checked for null bytes, hence the retlen
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198 * may be longer than what is returned by strlen */
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199 char* buf_getstring(buffer* buf, unsigned int *retlen) {
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200
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201 unsigned int len;
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202 char* ret;
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203 void* src = NULL;
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204 len = buf_getint(buf);
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205 if (len > MAX_STRING_LEN) {
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206 dropbear_exit("String too long");
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207 }
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208
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209 if (retlen != NULL) {
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210 *retlen = len;
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211 }
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212 src = buf_getptr(buf, len);
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213 ret = m_malloc(len+1);
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214 memcpy(ret, src, len);
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215 buf_incrpos(buf, len);
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216 ret[len] = '\0';
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217
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218 return ret;
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219 }
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220
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221 /* Return a string as a newly allocated buffer */
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222 static buffer * buf_getstringbuf_int(buffer *buf, int incllen) {
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223 buffer *ret = NULL;
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224 unsigned int len = buf_getint(buf);
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225 int extra = 0;
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226 if (len > MAX_STRING_LEN) {
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227 dropbear_exit("String too long");
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228 }
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229 if (incllen) {
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230 extra = 4;
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231 }
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232 ret = buf_new(len+extra);
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233 if (incllen) {
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234 buf_putint(ret, len);
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235 }
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236 memcpy(buf_getwriteptr(ret, len), buf_getptr(buf, len), len);
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237 buf_incrpos(buf, len);
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238 buf_incrlen(ret, len);
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239 buf_setpos(ret, 0);
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240 return ret;
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241 }
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242
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243 /* Return a string as a newly allocated buffer */
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244 buffer * buf_getstringbuf(buffer *buf) {
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245 return buf_getstringbuf_int(buf, 0);
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246 }
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247
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248 /* Returns a string in a new buffer, including the length */
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249 buffer * buf_getbuf(buffer *buf) {
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250 return buf_getstringbuf_int(buf, 1);
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251 }
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252
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253 /* Just increment the buffer position the same as if we'd used buf_getstring,
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254 * but don't bother copying/malloc()ing for it */
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255 void buf_eatstring(buffer *buf) {
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256
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257 buf_incrpos( buf, buf_getint(buf) );
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258 }
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259
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260 /* Get an uint32 from the buffer and increment the pos */
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261 unsigned int buf_getint(buffer* buf) {
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262 unsigned int ret;
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263
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264 LOAD32H(ret, buf_getptr(buf, 4));
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265 buf_incrpos(buf, 4);
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266 return ret;
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267 }
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268
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269 /* put a 32bit uint into the buffer, incr bufferlen & pos if required */
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270 void buf_putint(buffer* buf, int unsigned val) {
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271
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272 STORE32H(val, buf_getwriteptr(buf, 4));
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273 buf_incrwritepos(buf, 4);
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274
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275 }
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276
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277 /* put a SSH style string into the buffer, increasing buffer len if required */
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278 void buf_putstring(buffer* buf, const char* str, unsigned int len) {
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279
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280 buf_putint(buf, len);
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281 buf_putbytes(buf, (const unsigned char*)str, len);
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282
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283 }
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284
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285 /* puts an entire buffer as a SSH string. ignore pos of buf_str. */
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286 void buf_putbufstring(buffer *buf, const buffer* buf_str) {
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287 buf_putstring(buf, (const char*)buf_str->data, buf_str->len);
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288 }
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289
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290 /* put the set of len bytes into the buffer, incrementing the pos, increasing
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291 * len if required */
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292 void buf_putbytes(buffer *buf, const unsigned char *bytes, unsigned int len) {
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293 memcpy(buf_getwriteptr(buf, len), bytes, len);
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294 buf_incrwritepos(buf, len);
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295 }
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296
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297
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298 /* for our purposes we only need positive (or 0) numbers, so will
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299 * fail if we get negative numbers */
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300 void buf_putmpint(buffer* buf, mp_int * mp) {
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301 size_t written;
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302 unsigned int len, pad = 0;
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303 TRACE2(("enter buf_putmpint"))
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304
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305 dropbear_assert(mp != NULL);
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306
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307 if (mp_isneg(mp)) {
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308 dropbear_exit("negative bignum");
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309 }
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310
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311 /* zero check */
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312 if (mp_iszero(mp)) {
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313 len = 0;
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314 } else {
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315 /* SSH spec requires padding for mpints with the MSB set, this code
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316 * implements it */
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317 len = mp_count_bits(mp);
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318 /* if the top bit of MSB is set, we need to pad */
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319 pad = (len%8 == 0) ? 1 : 0;
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320 len = len / 8 + 1; /* don't worry about rounding, we need it for
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321 padding anyway when len%8 == 0 */
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322
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323 }
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324
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325 /* store the length */
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326 buf_putint(buf, len);
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327
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328 /* store the actual value */
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329 if (len > 0) {
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330 if (pad) {
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331 buf_putbyte(buf, 0x00);
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332 }
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333 if (mp_to_ubin(mp, buf_getwriteptr(buf, len-pad), len-pad, &written) != MP_OKAY) {
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334 dropbear_exit("mpint error");
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335 }
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336 buf_incrwritepos(buf, written);
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337 }
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338
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339 TRACE2(("leave buf_putmpint"))
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340 }
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341
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342 /* Retrieve an mp_int from the buffer.
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343 * Will fail for -ve since they shouldn't be required here.
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344 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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345 int buf_getmpint(buffer* buf, mp_int* mp) {
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346
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347 unsigned int len;
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348 len = buf_getint(buf);
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349
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350 if (len == 0) {
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351 mp_zero(mp);
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352 return DROPBEAR_SUCCESS;
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353 }
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354
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355 if (len > BUF_MAX_MPINT) {
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356 return DROPBEAR_FAILURE;
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357 }
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358
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359 /* check for negative */
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360 if (*buf_getptr(buf, 1) & (1 << (CHAR_BIT-1))) {
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361 return DROPBEAR_FAILURE;
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362 }
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363
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364 if (mp_from_ubin(mp, buf_getptr(buf, len), len) != MP_OKAY) {
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365 return DROPBEAR_FAILURE;
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366 }
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367
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368 buf_incrpos(buf, len);
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369 return DROPBEAR_SUCCESS;
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370 }