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annotate common/listutil.c @ 769:44257ecdae6d

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Make Read File public
author Andre Heinecke <andre.heinecke@intevation.de>
date Thu, 10 Jul 2014 19:11:09 +0200
parents aa48ea7ead1f
children 7861950f7637
rev   line source
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1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=2)
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5 * and comes with ABSOLUTELY NO WARRANTY!
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6 * See LICENSE.txt for details.
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7 */
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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 #include "strhelp.h"
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20 #include "logging.h"
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21
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22 #ifdef RELEASE_BUILD
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23 #include "pubkey-release.h"
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24 #else
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25 #include "pubkey-test.h"
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26 #endif
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27
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28 #pragma GCC diagnostic ignored "-Wconversion"
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29 /* Polarssl mh.h contains a conversion which gcc warns about */
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30 #include <polarssl/pk.h>
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31 #include <polarssl/base64.h>
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32 #include <polarssl/sha256.h>
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33 #pragma GCC diagnostic pop
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34
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35 #define MAX_FILESIZE (MAX_LINE_LENGTH * MAX_LINES)
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36
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37 #define READ_FILE_UNREADABLE -1
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38 #define READ_FILE_TOO_LARGE -2
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39 #define READ_FILE_NO_MEMORY -3
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40 #define READ_FILE_READ_FAILED -4
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41 #define READ_FILE_INVALID_CALL -5
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42 int
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43 read_file(const char *file_name, char **data, size_t *size,
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44 const size_t max_size)
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45 {
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46 FILE *f;
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47 long file_size;
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48
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49 if (!file_name || !data || !size || !max_size) {
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50 return READ_FILE_INVALID_CALL;
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51 }
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52
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53 f = fopen(file_name, "rb");
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54 if (f == NULL)
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55 return READ_FILE_UNREADABLE;
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56
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57 fseek(f, 0, SEEK_END);
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58 file_size = ftell(f);
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59 if (file_size <= 0){
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60 fclose(f);
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61 return READ_FILE_UNREADABLE;
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62 }
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63
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64 fseek(f, 0, SEEK_SET);
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65
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66 if (file_size + 1 == 0) {
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67 fclose(f);
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68 return READ_FILE_TOO_LARGE;
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69 }
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70 *size = (size_t) file_size;
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71
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72 if (*size > max_size) {
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73 fclose(f);
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74 return READ_FILE_TOO_LARGE;
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75 }
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76
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77 *data = (char *) malloc( *size + 1 );
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78 if (*data == NULL) {
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79 fclose(f);
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80 return READ_FILE_NO_MEMORY;
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81 }
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82
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83 if (fread(*data, 1, *size, f) != *size) {
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84 free(*data);
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85 fclose(f);
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86 return READ_FILE_READ_FAILED;
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87 }
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88
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89 fclose(f);
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90
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91 (*data)[*size] = '\0';
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92
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93 return 0;
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94 }
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95
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96 int verify_list(const char *data, const size_t size)
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97 {
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98 int ret = -1;
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99 pk_context pub_key_ctx;
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100 char *p;
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101 /* Fixed key size of 3072 implies the sizes*/
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102 const size_t sig_b64_size = 512;
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103 size_t sig_size = 384;
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104
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105 char signature_b64[sig_b64_size + 1];
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106 unsigned char signature[sig_size];
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107 /* Hash algroithm is sha256 */
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108 unsigned char hash[32];
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109
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110 if (!data || !size) {
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111 return -1;
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112 }
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113
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114 /* Fetch the signature from the first line od data */
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115 p = strchr(data, '\r');
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116 if (p == 0 || (unsigned int)(p - (data + 2)) != sig_b64_size) {
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117 /* printf("Invalid data. Signature might be too long.\n"); */
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118 return -1;
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119 }
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120 strncpy(signature_b64, data + 2, sig_b64_size);
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121 signature_b64[sig_b64_size] = '\0';
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122
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123 ret = base64_decode(signature, &sig_size,
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124 (unsigned char *)signature_b64, sig_b64_size);
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125
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126 if (ret != 0 || sig_size != 384) {
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127 /* printf("failed to decode signature\n"); */
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128 return -1;
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129 }
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130
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131 /* Hash is calculated over the data without the first line.
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132 * linebreaks are \r\n so the first char of the new line is
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133 * p+2 */
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134 p += 2;
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135 /* Size of the data to hash is the size - signature line
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136 * signature line is sig_b64_size - "S:" and - "\r\n" so -4*/
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137 sha256((unsigned char *)p, size - sig_b64_size - 4, hash, 0);
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138
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139 pk_init(&pub_key_ctx);
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140 #if 0
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141 {
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142 int i;
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143 FILE *foo = fopen("/tmp/testdump", "w");
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144 FILE *foo2 = fopen("/tmp/rawdump", "w");
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145 for (i=0; i< (int)(size - sig_b64_size - 2); i++)
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146 fprintf (foo, "%c", p[i]);
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147 for (i=0; i< (int)(size); i++)
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148 fprintf (foo2, "%c", data[i]);
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149 fclose(foo);
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150 printf ("Hash: \n");
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151 for (i=0; i<32; i++) {
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152 printf ("%x", hash[i]);
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153 }
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154 printf("\n");
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155 }
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156 #endif
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157
31
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158 ret = pk_parse_public_key(&pub_key_ctx, public_key_pem,
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159 public_key_pem_size);
28
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160 if (ret != 0) {
626
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161 ERRORPRINTF ("pk_parse_public_key failed with -0x%04x\n\n", -ret);
31
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162 pk_free(&pub_key_ctx);
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163 return ret;
28
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diff changeset
164 }
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parents: 22
diff changeset
165
31
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166 ret = pk_verify(&pub_key_ctx, POLARSSL_MD_SHA256, hash, 0,
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167 signature, sig_size);
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168
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169 if (ret != 0) {
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170 ERRORPRINTF ("pk_verify failed with -0x%04x\n\n", -ret);
31
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171 }
28
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172 pk_free(&pub_key_ctx);
31
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diff changeset
173
28
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174 return ret;
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parents: 22
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175 }
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176
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177 list_status_t read_and_verify_list(const char *file_name, char **data,
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178 size_t *size)
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179 {
4
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180 list_status_t retval = UnknownError;
7
992c0ec57660 Add unit tests make CertificateList work.
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181 *data = NULL;
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182 *size = 0;
31
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183 int ret = 0;
4
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184
31
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185 ret = read_file(file_name, data, size, MAX_FILESIZE);
4
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186
40
5cb1eb928253 Clean up debug output / functions
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187 /* printf ("Ret: %i \n", ret); */
31
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188 if (ret != 0) {
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189 if (ret == READ_FILE_TOO_LARGE) {
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190 return TooLarge;
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191 }
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192 if (ret == READ_FILE_UNREADABLE) {
66
4f79cf993737 Tiny improvement: free resources first that you have aquired last. Added TODO for better error reporting.
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193 /* TODO: work with errno ? */
178
b0579d4fa186 Made macro MAX_FILESIZE saver with brackets. A perror debugging line.
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194 /* errsv = errno; */
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195 /* perror("read_and_verify_list(), READ_FILE_UNREADABLE:"); */
31
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196 return SeekFailed;
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197 }
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198 if (ret == READ_FILE_READ_FAILED) {
66
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199 /* TODO: work with ferror() or feof() ? */
31
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200 return ReadFailed;
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201 }
4
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202 return UnknownError;
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203 }
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204
31
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diff changeset
205 if (!*data || !*size) {
40
5cb1eb928253 Clean up debug output / functions
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diff changeset
206 /* File is probably empty */
31
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207 return UnknownError;
4
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208 }
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209
31
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diff changeset
210 if (**data != 'S') {
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211 retval = InvalidFormat;
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212 } else {
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213 ret = verify_list (*data, *size);
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214 if (ret == 0) {
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215 /* Hooray */
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216 return Valid;
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217 }
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218 if (ret == -1) {
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219 /* our error */
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220 retval = InvalidFormat;
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221 } else {
92
4980b0deb773 Fix memleak in case of invalid signature
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diff changeset
222 retval = InvalidSignature;
31
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diff changeset
223 }
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diff changeset
224 }
9
2ad9a96518e3 Actually parse all elements in the list
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parents: 7
diff changeset
225
7
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diff changeset
226 if (retval != Valid && *data) {
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diff changeset
227 free(*data);
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228 *data = NULL;
4
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229 *size = 0;
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230 }
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231 return retval;
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232 }
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parents:
diff changeset
233
286
881ce5126f07 Add helper function to get all certificates in a list
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diff changeset
234 char **
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diff changeset
235 get_certs_from_list (char *data, const size_t size)
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parents: 178
diff changeset
236 {
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parents: 178
diff changeset
237 char *cur = data;
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
238 char **retval = NULL;
68
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
239
286
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
240 if (!data || !size)
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
241 {
626
f595fcbe3e76 Replace "normal printfs" with DEBUG / ERROR printf macros
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parents: 404
diff changeset
242 ERRORPRINTF ("Invalid call to get_certs_to_remove \n");
286
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parents: 178
diff changeset
243 return NULL;
68
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
244 }
286
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
245
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Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
246 while (cur)
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parents: 178
diff changeset
247 {
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parents: 178
diff changeset
248 char *next = strchr(cur, '\n');
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parents: 178
diff changeset
249 if (strlen(cur) > 3 && (cur[0] == 'I' || cur[0] == 'R') &&
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parents: 178
diff changeset
250 next - cur > 4)
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
251 {
292
57867a523dcf Do not cut off the last character of the line. (next-cur does not include \n)
Andre Heinecke <aheinecke@intevation.de>
parents: 286
diff changeset
252 size_t len = (size_t) (next - cur - 3);
286
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parents: 178
diff changeset
253 /* Remove I: or R: at the beginning and \r\n at the end */
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parents: 178
diff changeset
254 strv_append(&retval, cur + 2, len);
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parents: 178
diff changeset
255 }
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parents: 178
diff changeset
256 cur = next ? (next + 1) : NULL;
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parents: 178
diff changeset
257 }
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parents: 178
diff changeset
258 return retval;
68
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
259 }
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
260
http://wald.intevation.org/projects/trustbridge/