1 | /*
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2 | * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #ifndef HEADER_PACKET_LOCL_H
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11 | # define HEADER_PACKET_LOCL_H
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12 |
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13 | # include <string.h>
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14 | # include <openssl/bn.h>
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15 | # include <openssl/buffer.h>
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16 | # include <openssl/crypto.h>
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17 | # include <openssl/e_os2.h>
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18 |
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19 | # include "internal/numbers.h"
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20 |
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21 | # ifdef __cplusplus
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22 | extern "C" {
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23 | # endif
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24 |
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25 | typedef struct {
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26 | /* Pointer to where we are currently reading from */
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27 | const unsigned char *curr;
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28 | /* Number of bytes remaining */
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29 | size_t remaining;
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30 | } PACKET;
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31 |
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32 | /* Internal unchecked shorthand; don't use outside this file. */
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33 | static ossl_inline void packet_forward(PACKET *pkt, size_t len)
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34 | {
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35 | pkt->curr += len;
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36 | pkt->remaining -= len;
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37 | }
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38 |
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39 | /*
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40 | * Returns the number of bytes remaining to be read in the PACKET
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41 | */
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42 | static ossl_inline size_t PACKET_remaining(const PACKET *pkt)
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43 | {
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44 | return pkt->remaining;
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45 | }
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46 |
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47 | /*
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48 | * Returns a pointer to the first byte after the packet data.
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49 | * Useful for integrating with non-PACKET parsing code.
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50 | * Specifically, we use PACKET_end() to verify that a d2i_... call
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51 | * has consumed the entire packet contents.
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52 | */
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53 | static ossl_inline const unsigned char *PACKET_end(const PACKET *pkt)
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54 | {
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55 | return pkt->curr + pkt->remaining;
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56 | }
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57 |
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58 | /*
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59 | * Returns a pointer to the PACKET's current position.
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60 | * For use in non-PACKETized APIs.
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61 | */
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62 | static ossl_inline const unsigned char *PACKET_data(const PACKET *pkt)
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63 | {
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64 | return pkt->curr;
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65 | }
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66 |
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67 | /*
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68 | * Initialise a PACKET with |len| bytes held in |buf|. This does not make a
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69 | * copy of the data so |buf| must be present for the whole time that the PACKET
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70 | * is being used.
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71 | */
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72 | __owur static ossl_inline int PACKET_buf_init(PACKET *pkt,
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73 | const unsigned char *buf,
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74 | size_t len)
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75 | {
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76 | /* Sanity check for negative values. */
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77 | if (len > (size_t)(SIZE_MAX / 2))
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78 | return 0;
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79 |
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80 | pkt->curr = buf;
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81 | pkt->remaining = len;
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82 | return 1;
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83 | }
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84 |
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85 | /* Initialize a PACKET to hold zero bytes. */
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86 | static ossl_inline void PACKET_null_init(PACKET *pkt)
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87 | {
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88 | pkt->curr = NULL;
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89 | pkt->remaining = 0;
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90 | }
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91 |
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92 | /*
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93 | * Returns 1 if the packet has length |num| and its contents equal the |num|
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94 | * bytes read from |ptr|. Returns 0 otherwise (lengths or contents not equal).
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95 | * If lengths are equal, performs the comparison in constant time.
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96 | */
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97 | __owur static ossl_inline int PACKET_equal(const PACKET *pkt, const void *ptr,
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98 | size_t num)
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99 | {
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100 | if (PACKET_remaining(pkt) != num)
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101 | return 0;
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102 | return CRYPTO_memcmp(pkt->curr, ptr, num) == 0;
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103 | }
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104 |
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105 | /*
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106 | * Peek ahead and initialize |subpkt| with the next |len| bytes read from |pkt|.
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107 | * Data is not copied: the |subpkt| packet will share its underlying buffer with
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108 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
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109 | */
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110 | __owur static ossl_inline int PACKET_peek_sub_packet(const PACKET *pkt,
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111 | PACKET *subpkt, size_t len)
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112 | {
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113 | if (PACKET_remaining(pkt) < len)
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114 | return 0;
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115 |
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116 | return PACKET_buf_init(subpkt, pkt->curr, len);
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117 | }
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118 |
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119 | /*
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120 | * Initialize |subpkt| with the next |len| bytes read from |pkt|. Data is not
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121 | * copied: the |subpkt| packet will share its underlying buffer with the
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122 | * original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
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123 | */
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124 | __owur static ossl_inline int PACKET_get_sub_packet(PACKET *pkt,
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125 | PACKET *subpkt, size_t len)
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126 | {
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127 | if (!PACKET_peek_sub_packet(pkt, subpkt, len))
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128 | return 0;
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129 |
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130 | packet_forward(pkt, len);
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131 |
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132 | return 1;
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133 | }
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134 |
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135 | /*
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136 | * Peek ahead at 2 bytes in network order from |pkt| and store the value in
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137 | * |*data|
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138 | */
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139 | __owur static ossl_inline int PACKET_peek_net_2(const PACKET *pkt,
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140 | unsigned int *data)
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141 | {
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142 | if (PACKET_remaining(pkt) < 2)
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143 | return 0;
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144 |
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145 | *data = ((unsigned int)(*pkt->curr)) << 8;
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146 | *data |= *(pkt->curr + 1);
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147 |
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148 | return 1;
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149 | }
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150 |
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151 | /* Equivalent of n2s */
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152 | /* Get 2 bytes in network order from |pkt| and store the value in |*data| */
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153 | __owur static ossl_inline int PACKET_get_net_2(PACKET *pkt, unsigned int *data)
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154 | {
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155 | if (!PACKET_peek_net_2(pkt, data))
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156 | return 0;
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157 |
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158 | packet_forward(pkt, 2);
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159 |
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160 | return 1;
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161 | }
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162 |
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163 | /*
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164 | * Peek ahead at 3 bytes in network order from |pkt| and store the value in
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165 | * |*data|
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166 | */
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167 | __owur static ossl_inline int PACKET_peek_net_3(const PACKET *pkt,
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168 | unsigned long *data)
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169 | {
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170 | if (PACKET_remaining(pkt) < 3)
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171 | return 0;
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172 |
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173 | *data = ((unsigned long)(*pkt->curr)) << 16;
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174 | *data |= ((unsigned long)(*(pkt->curr + 1))) << 8;
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175 | *data |= *(pkt->curr + 2);
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176 |
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177 | return 1;
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178 | }
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179 |
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180 | /* Equivalent of n2l3 */
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181 | /* Get 3 bytes in network order from |pkt| and store the value in |*data| */
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182 | __owur static ossl_inline int PACKET_get_net_3(PACKET *pkt, unsigned long *data)
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183 | {
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184 | if (!PACKET_peek_net_3(pkt, data))
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185 | return 0;
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186 |
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187 | packet_forward(pkt, 3);
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188 |
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189 | return 1;
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190 | }
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191 |
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192 | /*
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193 | * Peek ahead at 4 bytes in network order from |pkt| and store the value in
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194 | * |*data|
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195 | */
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196 | __owur static ossl_inline int PACKET_peek_net_4(const PACKET *pkt,
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197 | unsigned long *data)
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198 | {
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199 | if (PACKET_remaining(pkt) < 4)
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200 | return 0;
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201 |
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202 | *data = ((unsigned long)(*pkt->curr)) << 24;
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203 | *data |= ((unsigned long)(*(pkt->curr + 1))) << 16;
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204 | *data |= ((unsigned long)(*(pkt->curr + 2))) << 8;
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205 | *data |= *(pkt->curr + 3);
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206 |
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207 | return 1;
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208 | }
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209 |
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210 | /* Equivalent of n2l */
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211 | /* Get 4 bytes in network order from |pkt| and store the value in |*data| */
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212 | __owur static ossl_inline int PACKET_get_net_4(PACKET *pkt, unsigned long *data)
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213 | {
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214 | if (!PACKET_peek_net_4(pkt, data))
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215 | return 0;
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216 |
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217 | packet_forward(pkt, 4);
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218 |
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219 | return 1;
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220 | }
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221 |
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222 | /* Peek ahead at 1 byte from |pkt| and store the value in |*data| */
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223 | __owur static ossl_inline int PACKET_peek_1(const PACKET *pkt,
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224 | unsigned int *data)
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225 | {
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226 | if (!PACKET_remaining(pkt))
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227 | return 0;
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228 |
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229 | *data = *pkt->curr;
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230 |
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231 | return 1;
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232 | }
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233 |
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234 | /* Get 1 byte from |pkt| and store the value in |*data| */
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235 | __owur static ossl_inline int PACKET_get_1(PACKET *pkt, unsigned int *data)
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236 | {
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237 | if (!PACKET_peek_1(pkt, data))
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238 | return 0;
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239 |
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240 | packet_forward(pkt, 1);
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241 |
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242 | return 1;
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243 | }
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244 |
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245 | /*
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246 | * Peek ahead at 4 bytes in reverse network order from |pkt| and store the value
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247 | * in |*data|
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248 | */
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249 | __owur static ossl_inline int PACKET_peek_4(const PACKET *pkt,
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250 | unsigned long *data)
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251 | {
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252 | if (PACKET_remaining(pkt) < 4)
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253 | return 0;
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254 |
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255 | *data = *pkt->curr;
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256 | *data |= ((unsigned long)(*(pkt->curr + 1))) << 8;
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257 | *data |= ((unsigned long)(*(pkt->curr + 2))) << 16;
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258 | *data |= ((unsigned long)(*(pkt->curr + 3))) << 24;
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259 |
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260 | return 1;
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261 | }
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262 |
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263 | /* Equivalent of c2l */
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264 | /*
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265 | * Get 4 bytes in reverse network order from |pkt| and store the value in
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266 | * |*data|
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267 | */
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268 | __owur static ossl_inline int PACKET_get_4(PACKET *pkt, unsigned long *data)
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269 | {
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270 | if (!PACKET_peek_4(pkt, data))
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271 | return 0;
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272 |
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273 | packet_forward(pkt, 4);
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274 |
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275 | return 1;
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276 | }
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277 |
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278 | /*
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279 | * Peek ahead at |len| bytes from the |pkt| and store a pointer to them in
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280 | * |*data|. This just points at the underlying buffer that |pkt| is using. The
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281 | * caller should not free this data directly (it will be freed when the
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282 | * underlying buffer gets freed
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283 | */
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284 | __owur static ossl_inline int PACKET_peek_bytes(const PACKET *pkt,
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285 | const unsigned char **data,
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286 | size_t len)
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287 | {
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288 | if (PACKET_remaining(pkt) < len)
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289 | return 0;
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290 |
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291 | *data = pkt->curr;
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292 |
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293 | return 1;
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294 | }
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295 |
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296 | /*
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297 | * Read |len| bytes from the |pkt| and store a pointer to them in |*data|. This
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298 | * just points at the underlying buffer that |pkt| is using. The caller should
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299 | * not free this data directly (it will be freed when the underlying buffer gets
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300 | * freed
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301 | */
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302 | __owur static ossl_inline int PACKET_get_bytes(PACKET *pkt,
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303 | const unsigned char **data,
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304 | size_t len)
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305 | {
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306 | if (!PACKET_peek_bytes(pkt, data, len))
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307 | return 0;
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308 |
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309 | packet_forward(pkt, len);
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310 |
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311 | return 1;
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312 | }
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313 |
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314 | /* Peek ahead at |len| bytes from |pkt| and copy them to |data| */
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315 | __owur static ossl_inline int PACKET_peek_copy_bytes(const PACKET *pkt,
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316 | unsigned char *data,
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317 | size_t len)
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318 | {
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319 | if (PACKET_remaining(pkt) < len)
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320 | return 0;
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321 |
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322 | memcpy(data, pkt->curr, len);
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323 |
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324 | return 1;
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325 | }
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326 |
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327 | /*
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328 | * Read |len| bytes from |pkt| and copy them to |data|.
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329 | * The caller is responsible for ensuring that |data| can hold |len| bytes.
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330 | */
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331 | __owur static ossl_inline int PACKET_copy_bytes(PACKET *pkt,
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332 | unsigned char *data, size_t len)
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333 | {
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334 | if (!PACKET_peek_copy_bytes(pkt, data, len))
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335 | return 0;
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336 |
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337 | packet_forward(pkt, len);
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338 |
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339 | return 1;
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340 | }
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341 |
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342 | /*
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343 | * Copy packet data to |dest|, and set |len| to the number of copied bytes.
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344 | * If the packet has more than |dest_len| bytes, nothing is copied.
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345 | * Returns 1 if the packet data fits in |dest_len| bytes, 0 otherwise.
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346 | * Does not forward PACKET position (because it is typically the last thing
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347 | * done with a given PACKET).
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348 | */
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349 | __owur static ossl_inline int PACKET_copy_all(const PACKET *pkt,
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350 | unsigned char *dest,
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351 | size_t dest_len, size_t *len)
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352 | {
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353 | if (PACKET_remaining(pkt) > dest_len) {
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354 | *len = 0;
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355 | return 0;
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356 | }
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357 | *len = pkt->remaining;
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358 | memcpy(dest, pkt->curr, pkt->remaining);
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359 | return 1;
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360 | }
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361 |
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362 | /*
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363 | * Copy |pkt| bytes to a newly allocated buffer and store a pointer to the
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364 | * result in |*data|, and the length in |len|.
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365 | * If |*data| is not NULL, the old data is OPENSSL_free'd.
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366 | * If the packet is empty, or malloc fails, |*data| will be set to NULL.
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367 | * Returns 1 if the malloc succeeds and 0 otherwise.
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368 | * Does not forward PACKET position (because it is typically the last thing
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369 | * done with a given PACKET).
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370 | */
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371 | __owur static ossl_inline int PACKET_memdup(const PACKET *pkt,
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372 | unsigned char **data, size_t *len)
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373 | {
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374 | size_t length;
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375 |
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376 | OPENSSL_free(*data);
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377 | *data = NULL;
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378 | *len = 0;
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379 |
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380 | length = PACKET_remaining(pkt);
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381 |
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382 | if (length == 0)
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383 | return 1;
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384 |
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385 | *data = OPENSSL_memdup(pkt->curr, length);
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386 | if (*data == NULL)
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387 | return 0;
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388 |
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389 | *len = length;
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390 | return 1;
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391 | }
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392 |
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393 | /*
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394 | * Read a C string from |pkt| and copy to a newly allocated, NUL-terminated
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395 | * buffer. Store a pointer to the result in |*data|.
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396 | * If |*data| is not NULL, the old data is OPENSSL_free'd.
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397 | * If the data in |pkt| does not contain a NUL-byte, the entire data is
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398 | * copied and NUL-terminated.
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399 | * Returns 1 if the malloc succeeds and 0 otherwise.
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400 | * Does not forward PACKET position (because it is typically the last thing done
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401 | * with a given PACKET).
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402 | */
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403 | __owur static ossl_inline int PACKET_strndup(const PACKET *pkt, char **data)
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404 | {
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405 | OPENSSL_free(*data);
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406 |
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407 | /* This will succeed on an empty packet, unless pkt->curr == NULL. */
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408 | *data = OPENSSL_strndup((const char *)pkt->curr, PACKET_remaining(pkt));
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409 | return (*data != NULL);
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410 | }
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411 |
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412 | /* Returns 1 if |pkt| contains at least one 0-byte, 0 otherwise. */
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413 | static ossl_inline int PACKET_contains_zero_byte(const PACKET *pkt)
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414 | {
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415 | return memchr(pkt->curr, 0, pkt->remaining) != NULL;
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416 | }
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417 |
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418 | /* Move the current reading position forward |len| bytes */
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419 | __owur static ossl_inline int PACKET_forward(PACKET *pkt, size_t len)
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420 | {
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421 | if (PACKET_remaining(pkt) < len)
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422 | return 0;
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423 |
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424 | packet_forward(pkt, len);
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425 |
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426 | return 1;
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427 | }
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428 |
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429 | /*
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430 | * Reads a variable-length vector prefixed with a one-byte length, and stores
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431 | * the contents in |subpkt|. |pkt| can equal |subpkt|.
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432 | * Data is not copied: the |subpkt| packet will share its underlying buffer with
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433 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
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434 | * Upon failure, the original |pkt| and |subpkt| are not modified.
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435 | */
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436 | __owur static ossl_inline int PACKET_get_length_prefixed_1(PACKET *pkt,
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437 | PACKET *subpkt)
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438 | {
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439 | unsigned int length;
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440 | const unsigned char *data;
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441 | PACKET tmp = *pkt;
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442 | if (!PACKET_get_1(&tmp, &length) ||
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443 | !PACKET_get_bytes(&tmp, &data, (size_t)length)) {
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444 | return 0;
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445 | }
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446 |
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447 | *pkt = tmp;
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448 | subpkt->curr = data;
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449 | subpkt->remaining = length;
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450 |
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451 | return 1;
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452 | }
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453 |
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454 | /*
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455 | * Like PACKET_get_length_prefixed_1, but additionally, fails when there are
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456 | * leftover bytes in |pkt|.
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457 | */
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458 | __owur static ossl_inline int PACKET_as_length_prefixed_1(PACKET *pkt,
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459 | PACKET *subpkt)
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460 | {
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461 | unsigned int length;
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---|
462 | const unsigned char *data;
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463 | PACKET tmp = *pkt;
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464 | if (!PACKET_get_1(&tmp, &length) ||
|
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465 | !PACKET_get_bytes(&tmp, &data, (size_t)length) ||
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466 | PACKET_remaining(&tmp) != 0) {
|
---|
467 | return 0;
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---|
468 | }
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469 |
|
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470 | *pkt = tmp;
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---|
471 | subpkt->curr = data;
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472 | subpkt->remaining = length;
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473 |
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474 | return 1;
|
---|
475 | }
|
---|
476 |
|
---|
477 | /*
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478 | * Reads a variable-length vector prefixed with a two-byte length, and stores
|
---|
479 | * the contents in |subpkt|. |pkt| can equal |subpkt|.
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480 | * Data is not copied: the |subpkt| packet will share its underlying buffer with
|
---|
481 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
|
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482 | * Upon failure, the original |pkt| and |subpkt| are not modified.
|
---|
483 | */
|
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484 | __owur static ossl_inline int PACKET_get_length_prefixed_2(PACKET *pkt,
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---|
485 | PACKET *subpkt)
|
---|
486 | {
|
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487 | unsigned int length;
|
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488 | const unsigned char *data;
|
---|
489 | PACKET tmp = *pkt;
|
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490 |
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491 | if (!PACKET_get_net_2(&tmp, &length) ||
|
---|
492 | !PACKET_get_bytes(&tmp, &data, (size_t)length)) {
|
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493 | return 0;
|
---|
494 | }
|
---|
495 |
|
---|
496 | *pkt = tmp;
|
---|
497 | subpkt->curr = data;
|
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498 | subpkt->remaining = length;
|
---|
499 |
|
---|
500 | return 1;
|
---|
501 | }
|
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502 |
|
---|
503 | /*
|
---|
504 | * Like PACKET_get_length_prefixed_2, but additionally, fails when there are
|
---|
505 | * leftover bytes in |pkt|.
|
---|
506 | */
|
---|
507 | __owur static ossl_inline int PACKET_as_length_prefixed_2(PACKET *pkt,
|
---|
508 | PACKET *subpkt)
|
---|
509 | {
|
---|
510 | unsigned int length;
|
---|
511 | const unsigned char *data;
|
---|
512 | PACKET tmp = *pkt;
|
---|
513 |
|
---|
514 | if (!PACKET_get_net_2(&tmp, &length) ||
|
---|
515 | !PACKET_get_bytes(&tmp, &data, (size_t)length) ||
|
---|
516 | PACKET_remaining(&tmp) != 0) {
|
---|
517 | return 0;
|
---|
518 | }
|
---|
519 |
|
---|
520 | *pkt = tmp;
|
---|
521 | subpkt->curr = data;
|
---|
522 | subpkt->remaining = length;
|
---|
523 |
|
---|
524 | return 1;
|
---|
525 | }
|
---|
526 |
|
---|
527 | /*
|
---|
528 | * Reads a variable-length vector prefixed with a three-byte length, and stores
|
---|
529 | * the contents in |subpkt|. |pkt| can equal |subpkt|.
|
---|
530 | * Data is not copied: the |subpkt| packet will share its underlying buffer with
|
---|
531 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
|
---|
532 | * Upon failure, the original |pkt| and |subpkt| are not modified.
|
---|
533 | */
|
---|
534 | __owur static ossl_inline int PACKET_get_length_prefixed_3(PACKET *pkt,
|
---|
535 | PACKET *subpkt)
|
---|
536 | {
|
---|
537 | unsigned long length;
|
---|
538 | const unsigned char *data;
|
---|
539 | PACKET tmp = *pkt;
|
---|
540 | if (!PACKET_get_net_3(&tmp, &length) ||
|
---|
541 | !PACKET_get_bytes(&tmp, &data, (size_t)length)) {
|
---|
542 | return 0;
|
---|
543 | }
|
---|
544 |
|
---|
545 | *pkt = tmp;
|
---|
546 | subpkt->curr = data;
|
---|
547 | subpkt->remaining = length;
|
---|
548 |
|
---|
549 | return 1;
|
---|
550 | }
|
---|
551 | # ifdef __cplusplus
|
---|
552 | }
|
---|
553 | # endif
|
---|
554 |
|
---|
555 | #endif /* HEADER_PACKET_LOCL_H */
|
---|