Mercurial > trustbridge
annotate common/listutil.c @ 1085:84311f4ce89b
Remove patch that is included in curl 7.38
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Fri, 12 Sep 2014 13:08:07 +0200 |
parents | edbf5e5e88f4 |
children | fd7d04bb37cb |
rev | line source |
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404 | 1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik |
2 * Software engineering by Intevation GmbH | |
3 * | |
4 * This file is Free Software under the GNU GPL (v>=2) | |
5 * and comes with ABSOLUTELY NO WARRANTY! | |
6 * See LICENSE.txt for details. | |
7 */ | |
4
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8 #include "listutil.h" |
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9 |
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10 #include <stdio.h> |
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11 #include <stdlib.h> |
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12 #include <errno.h> |
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13 #include <fcntl.h> |
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14 #include <unistd.h> |
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15 #include <sys/types.h> |
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16 #include <sys/stat.h> |
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17 #include <string.h> |
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18 |
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19 #ifdef WIN32 |
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20 #include <share.h> |
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21 #endif |
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22 |
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23 #include "strhelp.h" |
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24 #include "logging.h" |
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25 |
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If DO_RELEASE_BUILD is set use pubkey-release and test with it
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26 #ifdef RELEASE_BUILD |
28
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27 #include "pubkey-release.h" |
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28 #else |
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29 #include "pubkey-test.h" |
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30 #endif |
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31 |
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32 #pragma GCC diagnostic ignored "-Wconversion" |
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33 /* Polarssl mh.h contains a conversion which gcc warns about */ |
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34 #include <polarssl/pk.h> |
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35 #include <polarssl/base64.h> |
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36 #include <polarssl/sha256.h> |
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37 #pragma GCC diagnostic pop |
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38 |
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39 #define MAX_FILESIZE (MAX_LINE_LENGTH * MAX_LINES) |
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40 |
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41 #define READ_FILE_UNREADABLE -1 |
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42 #define READ_FILE_TOO_LARGE -2 |
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43 #define READ_FILE_NO_MEMORY -3 |
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44 #define READ_FILE_READ_FAILED -4 |
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45 #define READ_FILE_INVALID_CALL -5 |
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46 int |
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47 read_file(const char *file_name, char **data, size_t *size, |
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48 const size_t max_size, FILE **fptr) |
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49 { |
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50 FILE *f; |
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51 long file_size; |
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52 |
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53 if (!file_name || !data || !size || !max_size) |
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54 { |
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55 return READ_FILE_INVALID_CALL; |
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56 } |
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57 #ifdef WIN32 |
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58 { |
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59 wchar_t *wFilename = utf8_to_wchar(file_name, strlen(file_name)); |
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60 if (!wFilename) |
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61 { |
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62 return READ_FILE_UNREADABLE; |
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63 } |
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64 /* We open and write protect the file here so that |
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65 as long as the file is open we can be sure that |
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66 it was not modified and can use it in subsequent |
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67 calls based on the filename. */ |
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68 f = _wfsopen(wFilename, L"rb", _SH_DENYWR); |
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69 xfree(wFilename); |
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70 } |
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71 #else |
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72 f = fopen(file_name, "rb"); |
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73 #endif |
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74 if (f == NULL) |
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75 return READ_FILE_UNREADABLE; |
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76 |
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77 fseek(f, 0, SEEK_END); |
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78 file_size = ftell(f); |
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79 if (file_size <= 0) |
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80 { |
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81 fclose(f); |
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82 return READ_FILE_UNREADABLE; |
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83 } |
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84 |
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85 fseek(f, 0, SEEK_SET); |
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86 |
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87 if (file_size + 1 == 0) |
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88 { |
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89 fclose(f); |
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90 return READ_FILE_TOO_LARGE; |
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91 } |
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92 *size = (size_t) file_size; |
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93 |
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94 if (*size > max_size) |
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95 { |
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96 fclose(f); |
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97 return READ_FILE_TOO_LARGE; |
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98 } |
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99 |
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100 *data = (char *) malloc( *size + 1 ); |
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101 if (*data == NULL) |
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102 { |
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103 fclose(f); |
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104 return READ_FILE_NO_MEMORY; |
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105 } |
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106 |
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107 if (fread(*data, 1, *size, f) != *size) |
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108 { |
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109 free(*data); |
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110 fclose(f); |
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111 return READ_FILE_READ_FAILED; |
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112 } |
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113 |
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114 if (fptr) |
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115 { |
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116 *fptr = f; |
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117 } |
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118 else |
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119 { |
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120 fclose(f); |
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121 } |
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122 |
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123 (*data)[*size] = '\0'; |
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124 |
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125 return 0; |
4
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126 } |
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127 |
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128 int verify_list(const char *data, const size_t size) |
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129 { |
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130 int ret = -1; |
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131 pk_context pub_key_ctx; |
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132 char *p; |
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133 |
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134 /* Modulus / 8 are the necessary bytes. */ |
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135 #ifndef TRUSTBRIDGE_RSA_KEY_SIZE |
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136 # error "Key size undefined" |
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137 #endif |
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138 const size_t sig_b64_size = TRUSTBRIDGE_RSA_KEY_SIZE / 8 * 4 / 3; |
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139 size_t sig_size = TRUSTBRIDGE_RSA_KEY_SIZE / 8; |
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140 |
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141 char signature_b64[sig_b64_size + 1]; |
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142 unsigned char signature[sig_size]; |
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143 /* Hash algroithm is sha256 */ |
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144 unsigned char hash[32]; |
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145 |
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146 if (!data || !size) |
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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 /* Fetch the signature from the first line od data */ |
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152 p = strchr(data, '\r'); |
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153 if (p == 0 || (unsigned int)(p - (data + 2)) != sig_b64_size) |
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154 { |
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155 /* printf("Invalid data. Signature might be too long.\n"); */ |
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156 return -1; |
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157 } |
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158 strncpy(signature_b64, data + 2, sig_b64_size); |
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159 signature_b64[sig_b64_size] = '\0'; |
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160 |
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161 ret = base64_decode(signature, &sig_size, |
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162 (unsigned char *)signature_b64, sig_b64_size); |
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163 |
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164 if (ret != 0 || sig_size != TRUSTBRIDGE_RSA_KEY_SIZE / 8) |
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165 { |
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166 /* printf("failed to decode signature\n"); */ |
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167 return -1; |
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168 } |
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169 |
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170 /* Hash is calculated over the data without the first line. |
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171 * linebreaks are \r\n so the first char of the new line is |
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172 * p+2 */ |
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173 p += 2; |
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174 /* Size of the data to hash is the size - signature line |
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175 * signature line is sig_b64_size - "S:" and - "\r\n" so -4*/ |
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176 sha256((unsigned char *)p, size - sig_b64_size - 4, hash, 0); |
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177 |
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178 pk_init(&pub_key_ctx); |
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179 |
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180 ret = pk_parse_public_key(&pub_key_ctx, public_key_pem, |
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181 public_key_pem_size); |
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182 if (ret != 0) |
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183 { |
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184 ERRORPRINTF ("pk_parse_public_key failed with -0x%04x\n\n", -ret); |
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185 pk_free(&pub_key_ctx); |
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186 return ret; |
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187 } |
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188 |
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189 ret = pk_verify(&pub_key_ctx, POLARSSL_MD_SHA256, hash, 0, |
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190 signature, sig_size); |
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191 |
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192 if (ret != 0) |
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193 { |
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194 ERRORPRINTF ("pk_verify failed with -0x%04x\n\n", -ret); |
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195 } |
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196 pk_free(&pub_key_ctx); |
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197 |
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198 return ret; |
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199 } |
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200 |
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201 list_status_t read_and_verify_list(const char *file_name, char **data, |
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202 size_t *size) |
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203 { |
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204 list_status_t retval = UnknownError; |
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205 *data = NULL; |
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206 *size = 0; |
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207 int ret = 0; |
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208 |
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209 ret = read_file(file_name, data, size, MAX_FILESIZE, NULL); |
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210 |
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211 /* printf ("Ret: %i \n", ret); */ |
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212 if (ret != 0) |
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213 { |
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214 if (ret == READ_FILE_TOO_LARGE) |
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215 { |
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216 return TooLarge; |
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217 } |
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218 if (ret == READ_FILE_UNREADABLE) |
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219 { |
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220 /* TODO: work with errno ? */ |
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221 /* errsv = errno; */ |
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222 /* perror("read_and_verify_list(), READ_FILE_UNREADABLE:"); */ |
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223 return SeekFailed; |
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224 } |
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225 if (ret == READ_FILE_READ_FAILED) |
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226 { |
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227 /* TODO: work with ferror() or feof() ? */ |
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228 return ReadFailed; |
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229 } |
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230 return UnknownError; |
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231 } |
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232 |
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233 if (!*data || !*size) |
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234 { |
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235 /* File is probably empty */ |
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236 return UnknownError; |
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237 } |
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238 |
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239 if (**data != 'S') |
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240 { |
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241 retval = InvalidFormat; |
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242 } |
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243 else |
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244 { |
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245 ret = verify_list (*data, *size); |
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246 if (ret == 0) |
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247 { |
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248 /* Hooray */ |
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249 return Valid; |
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250 } |
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251 if (ret == -1) |
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252 { |
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253 /* our error */ |
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254 retval = InvalidFormat; |
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255 } |
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256 else |
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257 { |
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258 retval = InvalidSignature; |
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259 } |
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260 } |
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261 |
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262 if (retval != Valid && *data) |
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263 { |
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264 free(*data); |
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265 *data = NULL; |
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266 *size = 0; |
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267 } |
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268 return retval; |
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269 } |
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270 |
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271 char ** |
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272 get_certs_from_list (char *data, const size_t size) |
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273 { |
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274 char *cur = data; |
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275 char **retval = NULL; |
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276 |
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277 if (!data || !size) |
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278 { |
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279 ERRORPRINTF ("Invalid call to get_certs_to_remove \n"); |
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280 return NULL; |
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281 } |
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282 |
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283 while (cur) |
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284 { |
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285 char *next = strchr(cur, '\n'); |
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286 if (strlen(cur) > 3 && (cur[0] == 'I' || cur[0] == 'R') && |
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287 next - cur > 4) |
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288 { |
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289 size_t len = (size_t) (next - cur - 3); |
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290 /* Remove I: or R: at the beginning and \r\n at the end */ |
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291 strv_append(&retval, cur + 2, len); |
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292 } |
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293 cur = next ? (next + 1) : NULL; |
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294 } |
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295 return retval; |
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296 } |
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297 |