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annotate libtomcrypt/src/pk/asn1/der/teletex_string/der_length_teletex_string.c @ 1630:9579377b5f8b

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use strlcpy & strlcat (#74) * refactor checkpubkeyperms() with safe BSD functions fix gcc8 warnings ``` svr-authpubkey.c: In function 'checkpubkeyperms': svr-authpubkey.c:427:2: warning: 'strncat' specified bound 5 equals source length [-Wstringop-overflow=] strncat(filename, "/.ssh", 5); /* strlen("/.ssh") == 5 */ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ svr-authpubkey.c:433:2: warning: 'strncat' specified bound 16 equals source length [-Wstringop-overflow=] strncat(filename, "/authorized_keys", 16); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``` see https://www.sudo.ws/todd/papers/strlcpy.html * restore strlcpy in xstrdup see original https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/xmalloc.c?rev=1.16
author François Perrad <francois.perrad@gadz.org>
date Wed, 20 Mar 2019 15:09:19 +0100
parents 6dba84798cd5
children
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9 #include "tomcrypt.h"
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10
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11 /**
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12 @file der_length_teletex_string.c
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13 ASN.1 DER, get length of teletex STRING
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14 */
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15
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16 #ifdef LTC_DER
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17
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18 static const struct {
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19 int code, value;
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20 } teletex_table[] = {
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21 { '\0', 0 },
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22 { '\a', 7 },
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23 { '\b', 8 },
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24 { '\t', 9 },
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25 { '\n', 10 },
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26 { '\v', 11 },
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27 { '\f', 12 },
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28 { '\r', 13 },
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29 { ' ', 32 },
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30 { '!', 33 },
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31 { '"', 34 },
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32 { '%', 37 },
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33 { '&', 38 },
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34 { '\'', 39 },
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35 { '(', 40 },
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36 { ')', 41 },
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37 { '+', 43 },
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38 { ',', 44 },
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39 { '-', 45 },
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40 { '.', 46 },
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41 { '/', 47 },
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42 { '0', 48 },
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43 { '1', 49 },
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44 { '2', 50 },
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45 { '3', 51 },
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46 { '4', 52 },
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47 { '5', 53 },
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48 { '6', 54 },
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49 { '7', 55 },
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50 { '8', 56 },
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51 { '9', 57 },
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52 { ':', 58 },
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53 { ';', 59 },
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54 { '<', 60 },
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55 { '=', 61 },
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56 { '>', 62 },
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57 { '?', 63 },
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58 { '@', 64 },
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59 { 'A', 65 },
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60 { 'B', 66 },
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61 { 'C', 67 },
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62 { 'D', 68 },
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63 { 'E', 69 },
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64 { 'F', 70 },
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65 { 'G', 71 },
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66 { 'H', 72 },
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67 { 'I', 73 },
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68 { 'J', 74 },
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71 { 'M', 77 },
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72 { 'N', 78 },
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73 { 'O', 79 },
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74 { 'P', 80 },
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75 { 'Q', 81 },
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84 { 'Z', 90 },
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85 { '[', 91 },
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86 { ']', 93 },
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87 { '_', 95 },
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89 { 'b', 98 },
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91 { 'd', 100 },
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93 { 'f', 102 },
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98 { 'k', 107 },
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100 { 'm', 109 },
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101 { 'n', 110 },
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102 { 'o', 111 },
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103 { 'p', 112 },
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104 { 'q', 113 },
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105 { 'r', 114 },
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106 { 's', 115 },
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107 { 't', 116 },
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108 { 'u', 117 },
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109 { 'v', 118 },
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110 { 'w', 119 },
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111 { 'x', 120 },
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112 { 'y', 121 },
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113 { 'z', 122 },
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114 { '|', 124 },
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115 { ' ', 160 },
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116 { 0xa1, 161 },
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117 { 0xa2, 162 },
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119 { '$', 164 },
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121 { '#', 166 },
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122 { 0xa7, 167 },
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123 { 0xa4, 168 },
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124 { 0xab, 171 },
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125 { 0xb0, 176 },
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126 { 0xb1, 177 },
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127 { 0xb2, 178 },
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128 { 0xb3, 179 },
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134 { 0xbb, 187 },
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135 { 0xbc, 188 },
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136 { 0xbd, 189 },
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137 { 0xbe, 190 },
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138 { 0xbf, 191 },
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139 };
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140
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141 int der_teletex_char_encode(int c)
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142 {
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143 int x;
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144 for (x = 0; x < (int)(sizeof(teletex_table)/sizeof(teletex_table[0])); x++) {
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145 if (teletex_table[x].code == c) {
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146 return teletex_table[x].value;
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147 }
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148 }
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149 return -1;
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150 }
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151
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152 int der_teletex_value_decode(int v)
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153 {
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154 int x;
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155 for (x = 0; x < (int)(sizeof(teletex_table)/sizeof(teletex_table[0])); x++) {
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156 if (teletex_table[x].value == v) {
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157 return teletex_table[x].code;
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158 }
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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 Gets length of DER encoding of teletex STRING
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165 @param octets The values you want to encode
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166 @param noctets The number of octets in the string to encode
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167 @param outlen [out] The length of the DER encoding for the given string
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168 @return CRYPT_OK if successful
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169 */
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170 int der_length_teletex_string(const unsigned char *octets, unsigned long noctets, unsigned long *outlen)
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171 {
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172 unsigned long x;
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173
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174 LTC_ARGCHK(outlen != NULL);
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175 LTC_ARGCHK(octets != NULL);
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176
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177 /* scan string for validity */
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178 for (x = 0; x < noctets; x++) {
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179 if (der_teletex_char_encode(octets[x]) == -1) {
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180 return CRYPT_INVALID_ARG;
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181 }
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182 }
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183
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184 if (noctets < 128) {
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185 /* 16 LL DD DD DD ... */
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186 *outlen = 2 + noctets;
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187 } else if (noctets < 256) {
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188 /* 16 81 LL DD DD DD ... */
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189 *outlen = 3 + noctets;
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190 } else if (noctets < 65536UL) {
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191 /* 16 82 LL LL DD DD DD ... */
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192 *outlen = 4 + noctets;
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193 } else if (noctets < 16777216UL) {
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194 /* 16 83 LL LL LL DD DD DD ... */
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195 *outlen = 5 + noctets;
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196 } else {
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197 return CRYPT_INVALID_ARG;
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198 }
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199
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200 return CRYPT_OK;
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201 }
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202
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203 #endif
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204
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205
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206 /* ref: $Format:%D$ */
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207 /* git commit: $Format:%H$ */
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208 /* commit time: $Format:%ai$ */