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annotate common/listutil.c @ 50:a7b8cb29f1f6

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Rename random files to garbage to clarify what they contain
author Andre Heinecke <aheinecke@intevation.de>
date Mon, 17 Mar 2014 11:36:42 +0000
parents 7055a79abe02
children 3f6378647371
rev   line source
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1 #include "listutil.h"
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2
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3 #include <stdio.h>
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4 #include <stdlib.h>
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5 #include <errno.h>
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6 #include <fcntl.h>
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7 #include <unistd.h>
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8 #include <sys/types.h>
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9 #include <sys/stat.h>
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10 #include <string.h>
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11
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12 #ifdef RELEASE
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13 #include "pubkey-release.h"
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14 #else
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15 #include "pubkey-test.h"
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16 #endif
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17
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18 #pragma GCC diagnostic ignored "-Wconversion"
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19 /* Polarssl mh.h contains a conversion which gcc warns about */
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20 #include <polarssl/pk.h>
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21 #include <polarssl/base64.h>
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22 #include <polarssl/sha256.h>
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23 #pragma GCC diagnostic pop
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24
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25 #define MAX_FILESIZE 1048576 /* 1024*1024 */
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26
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27 /**
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28 * @brief Read a file into memory.
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29 *
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30 * The caller needs to free data
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31 *
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32 * @param[in] fileName Name of the file.
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33 * @param[out] data the file content
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34 * @param[out] size size in bytes of the file content.
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35 * @param[in] max_size the maximum amount of bytes to read.
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36 *
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37 * @return 0 on success an error code otherwise.
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38 */
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39 #define READ_FILE_UNREADABLE -1
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40 #define READ_FILE_TOO_LARGE -2
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41 #define READ_FILE_NO_MEMORY -3
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42 #define READ_FILE_READ_FAILED -4
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43 static int 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 f = fopen(file_name, "rb");
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50 if (f == NULL)
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51 return READ_FILE_UNREADABLE;
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52
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53 fseek(f, 0, SEEK_END);
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54 file_size = ftell(f);
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55 if (file_size < 0){
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56 fclose(f);
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57 return READ_FILE_UNREADABLE;
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58 }
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59
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60 fseek(f, 0, SEEK_SET);
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61
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62 if (file_size + 1 == 0) {
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63 fclose(f);
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64 return READ_FILE_TOO_LARGE;
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65 }
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66 *size = (size_t) file_size;
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67
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68 if (*size > max_size) {
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69 fclose(f);
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70 return READ_FILE_TOO_LARGE;
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71 }
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72
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73 *data = (char *) malloc( *size + 1 );
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74 if (data == NULL) {
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75 fclose(f);
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76 return READ_FILE_NO_MEMORY;
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77 }
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78
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79 if (fread(*data, 1, *size, f) != *size) {
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80 fclose(f);
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81 free(*data);
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82 return READ_FILE_READ_FAILED;
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83 }
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84
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85 fclose(f);
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86
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87 (*data)[*size] = '\0';
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88
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89 return 0;
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90 }
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91
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92 /** @brief verify the certificate list
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93 *
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94 * The public key to verify against is the static publicKeyPEM data defined
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95 * in the pubkey header.
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96 *
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97 * @param [in] data the list data
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98 * @param [in] size the size of the data
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99 *
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100 * @returns 0 if the list is valid a polarssl error or -1 otherwise
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101 */
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102 int verify_list(char *data, size_t size)
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103 {
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104 int ret = -1;
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105 pk_context pub_key_ctx;
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106 char *p;
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107 /* Fixed key size of 3072 implies the sizes*/
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108 const size_t sig_b64_size = 512;
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109 size_t sig_size = 384;
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110
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111 char signature_b64[sig_b64_size + 1];
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112 unsigned char signature[sig_size];
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113 /* Hash algroithm is sha256 */
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114 unsigned char hash[32];
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115
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116 /* Fetch the signature from the first line od data */
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117 p = strchr(data, '\r');
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118 if (p == 0 || (unsigned int)(p - (data + 2)) != sig_b64_size) {
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119 /* printf("Invalid data. Signature might be too long.\n"); */
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120 return -1;
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121 }
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122 strncpy(signature_b64, data + 2, sig_b64_size);
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123 signature_b64[sig_b64_size] = '\0';
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124
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125 ret = base64_decode(signature, &sig_size,
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126 (unsigned char *)signature_b64, sig_b64_size);
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127
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128 if (ret != 0 || sig_size != 384) {
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129 /* printf("failed to decode signature\n"); */
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130 return -1;
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131 }
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132
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133 /* Hash is calculated over the data without the first line.
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134 * linebreaks are \r\n so the first char of the new line is
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135 * p+2 */
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136 p += 2;
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137 /* Size of the data to hash is the size - signature line
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138 * signature line is sig_b64_size - "S:" and - "\r\n" so -4*/
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139 sha256((unsigned char *)p, size - sig_b64_size - 4, hash, 0);
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140
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141 pk_init(&pub_key_ctx);
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142 #if 0
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143 {
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144 int i;
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145 FILE *foo = fopen("/tmp/testdump", "w");
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146 FILE *foo2 = fopen("/tmp/rawdump", "w");
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147 for (i=0; i< (int)(size - sig_b64_size - 2); i++)
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148 fprintf (foo, "%c", p[i]);
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149 for (i=0; i< (int)(size); i++)
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150 fprintf (foo2, "%c", data[i]);
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151 fclose(foo);
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152 printf ("Hash: \n");
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153 for (i=0; i<32; i++) {
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154 printf ("%x", hash[i]);
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155 }
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156 printf("\n");
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157 }
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158 #endif
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159
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160 ret = pk_parse_public_key(&pub_key_ctx, public_key_pem,
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161 public_key_pem_size);
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162 if (ret != 0) {
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163 printf("pk_parse_public_key failed with -0x%04x\n\n", -ret);
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164 pk_free(&pub_key_ctx);
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165 return ret;
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166 }
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167
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168 ret = pk_verify(&pub_key_ctx, POLARSSL_MD_SHA256, hash, 0,
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169 signature, sig_size);
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170
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171 if (ret != 0) {
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172 printf("pk_verify failed with -0x%04x\n\n", -ret);
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173 }
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174 pk_free(&pub_key_ctx);
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175
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176 return ret;
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177 }
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178
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179 list_status_t read_and_verify_list(const char *file_name, char **data,
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180 size_t *size)
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181 {
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182 list_status_t retval = UnknownError;
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183 *data = NULL;
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184 *size = 0;
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185 int ret = 0;
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186
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187 ret = read_file(file_name, data, size, MAX_FILESIZE);
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188
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189 /* printf ("Ret: %i \n", ret); */
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190 if (ret != 0) {
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191 if (ret == READ_FILE_TOO_LARGE) {
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192 return TooLarge;
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193 }
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194 if (ret == READ_FILE_UNREADABLE) {
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195 return SeekFailed;
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196 }
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197 if (ret == READ_FILE_READ_FAILED) {
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198 return ReadFailed;
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199 }
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200 return UnknownError;
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201 }
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202
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203 if (!*data || !*size) {
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204 /* File is probably empty */
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205 return UnknownError;
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206 }
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207
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208 if (**data != 'S') {
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209 retval = InvalidFormat;
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210 } else {
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211 ret = verify_list (*data, *size);
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212 if (ret == 0) {
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213 /* Hooray */
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214 return Valid;
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215 }
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216 if (ret == -1) {
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217 /* our error */
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218 retval = InvalidFormat;
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219 } else {
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7055a79abe02 Treat every polarssl error as invalid signature
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220 return InvalidSignature;
31
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221 }
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222 }
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2ad9a96518e3 Actually parse all elements in the list
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223
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224 if (retval != Valid && *data) {
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225 free(*data);
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226 *data = NULL;
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227 *size = 0;
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228 }
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229 return retval;
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230 }
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231
http://wald.intevation.org/projects/trustbridge/