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annotate common/listutil.c @ 452:f8b480b08532

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Factor out polarssl error handling and start new sslhelp file
author Andre Heinecke <aheinecke@intevation.de>
date Wed, 23 Apr 2014 10:33:40 +0000
parents 17e1c8f37d72
children f595fcbe3e76
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
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21 #ifdef RELEASE_BUILD
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22 #include "pubkey-release.h"
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23 #else
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24 #include "pubkey-test.h"
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25 #endif
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26
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27 #pragma GCC diagnostic ignored "-Wconversion"
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28 /* Polarssl mh.h contains a conversion which gcc warns about */
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29 #include <polarssl/pk.h>
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30 #include <polarssl/base64.h>
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31 #include <polarssl/sha256.h>
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32 #pragma GCC diagnostic pop
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33
178
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34 #define MAX_FILESIZE (MAX_LINE_LENGTH * MAX_LINES)
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35
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36 /**
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37 * @brief Read a file into memory.
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38 *
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39 * The caller needs to free data
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40 *
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41 * @param[in] fileName Name of the file.
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42 * @param[out] data the file content
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43 * @param[out] size size in bytes of the file content.
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44 * @param[in] max_size the maximum amount of bytes to read.
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45 *
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46 * @return 0 on success an error code otherwise.
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47 */
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48 #define READ_FILE_UNREADABLE -1
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49 #define READ_FILE_TOO_LARGE -2
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50 #define READ_FILE_NO_MEMORY -3
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51 #define READ_FILE_READ_FAILED -4
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52 #define READ_FILE_INVALID_CALL -5
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53 static int read_file(const char *file_name, char **data, size_t *size,
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54 const size_t max_size)
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55 {
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56 FILE *f;
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57 long file_size;
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58
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59 if (!file_name || !data || !size || !max_size) {
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60 return READ_FILE_INVALID_CALL;
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61 }
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62
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63 f = fopen(file_name, "rb");
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64 if (f == NULL)
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65 return READ_FILE_UNREADABLE;
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66
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67 fseek(f, 0, SEEK_END);
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68 file_size = ftell(f);
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69 if (file_size <= 0){
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70 fclose(f);
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71 return READ_FILE_UNREADABLE;
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72 }
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73
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74 fseek(f, 0, SEEK_SET);
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75
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76 if (file_size + 1 == 0) {
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77 fclose(f);
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78 return READ_FILE_TOO_LARGE;
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79 }
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80 *size = (size_t) file_size;
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81
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82 if (*size > max_size) {
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83 fclose(f);
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84 return READ_FILE_TOO_LARGE;
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85 }
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86
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87 *data = (char *) malloc( *size + 1 );
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88 if (*data == NULL) {
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89 fclose(f);
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90 return READ_FILE_NO_MEMORY;
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91 }
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92
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93 if (fread(*data, 1, *size, f) != *size) {
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4f79cf993737 Tiny improvement: free resources first that you have aquired last. Added TODO for better error reporting.
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94 free(*data);
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95 fclose(f);
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96 return READ_FILE_READ_FAILED;
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97 }
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98
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99 fclose(f);
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100
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101 (*data)[*size] = '\0';
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102
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103 return 0;
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104 }
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105
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106 int verify_list(const char *data, const size_t size)
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107 {
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108 int ret = -1;
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109 pk_context pub_key_ctx;
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110 char *p;
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111 /* Fixed key size of 3072 implies the sizes*/
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112 const size_t sig_b64_size = 512;
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113 size_t sig_size = 384;
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114
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115 char signature_b64[sig_b64_size + 1];
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116 unsigned char signature[sig_size];
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117 /* Hash algroithm is sha256 */
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118 unsigned char hash[32];
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119
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120 if (!data || !size) {
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121 return -1;
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122 }
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123
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124 /* Fetch the signature from the first line od data */
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125 p = strchr(data, '\r');
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126 if (p == 0 || (unsigned int)(p - (data + 2)) != sig_b64_size) {
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127 /* printf("Invalid data. Signature might be too long.\n"); */
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128 return -1;
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129 }
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130 strncpy(signature_b64, data + 2, sig_b64_size);
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131 signature_b64[sig_b64_size] = '\0';
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132
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133 ret = base64_decode(signature, &sig_size,
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134 (unsigned char *)signature_b64, sig_b64_size);
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135
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136 if (ret != 0 || sig_size != 384) {
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137 /* printf("failed to decode signature\n"); */
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138 return -1;
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139 }
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140
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141 /* Hash is calculated over the data without the first line.
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142 * linebreaks are \r\n so the first char of the new line is
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143 * p+2 */
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144 p += 2;
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145 /* Size of the data to hash is the size - signature line
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146 * signature line is sig_b64_size - "S:" and - "\r\n" so -4*/
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147 sha256((unsigned char *)p, size - sig_b64_size - 4, hash, 0);
28
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148
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149 pk_init(&pub_key_ctx);
31
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150 #if 0
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151 {
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152 int i;
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153 FILE *foo = fopen("/tmp/testdump", "w");
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154 FILE *foo2 = fopen("/tmp/rawdump", "w");
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155 for (i=0; i< (int)(size - sig_b64_size - 2); i++)
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156 fprintf (foo, "%c", p[i]);
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157 for (i=0; i< (int)(size); i++)
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158 fprintf (foo2, "%c", data[i]);
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159 fclose(foo);
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160 printf ("Hash: \n");
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161 for (i=0; i<32; i++) {
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162 printf ("%x", hash[i]);
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163 }
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164 printf("\n");
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165 }
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166 #endif
28
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diff changeset
167
31
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168 ret = pk_parse_public_key(&pub_key_ctx, public_key_pem,
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169 public_key_pem_size);
28
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170 if (ret != 0) {
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171 printf("pk_parse_public_key failed with -0x%04x\n\n", -ret);
31
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172 pk_free(&pub_key_ctx);
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173 return ret;
28
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174 }
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175
31
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176 ret = pk_verify(&pub_key_ctx, POLARSSL_MD_SHA256, hash, 0,
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177 signature, sig_size);
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178
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179 if (ret != 0) {
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180 printf("pk_verify failed with -0x%04x\n\n", -ret);
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181 }
28
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182 pk_free(&pub_key_ctx);
31
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diff changeset
183
28
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184 return ret;
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185 }
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186
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187 list_status_t read_and_verify_list(const char *file_name, char **data,
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188 size_t *size)
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189 {
4
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190 list_status_t retval = UnknownError;
7
992c0ec57660 Add unit tests make CertificateList work.
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191 *data = NULL;
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192 *size = 0;
31
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193 int ret = 0;
4
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194
31
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195 ret = read_file(file_name, data, size, MAX_FILESIZE);
4
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196
40
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197 /* printf ("Ret: %i \n", ret); */
31
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198 if (ret != 0) {
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199 if (ret == READ_FILE_TOO_LARGE) {
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200 return TooLarge;
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201 }
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202 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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203 /* TODO: work with errno ? */
178
b0579d4fa186 Made macro MAX_FILESIZE saver with brackets. A perror debugging line.
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204 /* errsv = errno; */
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205 /* perror("read_and_verify_list(), READ_FILE_UNREADABLE:"); */
31
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206 return SeekFailed;
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207 }
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208 if (ret == READ_FILE_READ_FAILED) {
66
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diff changeset
209 /* TODO: work with ferror() or feof() ? */
31
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210 return ReadFailed;
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211 }
4
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212 return UnknownError;
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213 }
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214
31
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diff changeset
215 if (!*data || !*size) {
40
5cb1eb928253 Clean up debug output / functions
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216 /* File is probably empty */
31
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217 return UnknownError;
4
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218 }
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diff changeset
219
31
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220 if (**data != 'S') {
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221 retval = InvalidFormat;
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222 } else {
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223 ret = verify_list (*data, *size);
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224 if (ret == 0) {
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225 /* Hooray */
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226 return Valid;
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diff changeset
227 }
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228 if (ret == -1) {
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229 /* our error */
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230 retval = InvalidFormat;
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231 } else {
92
4980b0deb773 Fix memleak in case of invalid signature
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diff changeset
232 retval = InvalidSignature;
31
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233 }
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diff changeset
234 }
9
2ad9a96518e3 Actually parse all elements in the list
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parents: 7
diff changeset
235
7
992c0ec57660 Add unit tests make CertificateList work.
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parents: 4
diff changeset
236 if (retval != Valid && *data) {
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diff changeset
237 free(*data);
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diff changeset
238 *data = NULL;
4
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239 *size = 0;
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240 }
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241 return retval;
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242 }
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parents:
diff changeset
243
286
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diff changeset
244 char **
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diff changeset
245 get_certs_from_list (char *data, const size_t size)
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diff changeset
246 {
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diff changeset
247 char *cur = data;
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diff changeset
248 char **retval = NULL;
68
8ffbb48528ae Add certificate installation for windows
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diff changeset
249
286
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diff changeset
250 if (!data || !size)
881ce5126f07 Add helper function to get all certificates in a list
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diff changeset
251 {
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diff changeset
252 printf ("Invalid call to get_certs_to_remove \n");
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diff changeset
253 return NULL;
68
8ffbb48528ae Add certificate installation for windows
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diff changeset
254 }
286
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
255
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
256 while (cur)
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parents: 178
diff changeset
257 {
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diff changeset
258 char *next = strchr(cur, '\n');
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parents: 178
diff changeset
259 if (strlen(cur) > 3 && (cur[0] == 'I' || cur[0] == 'R') &&
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diff changeset
260 next - cur > 4)
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parents: 178
diff changeset
261 {
292
57867a523dcf Do not cut off the last character of the line. (next-cur does not include \n)
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parents: 286
diff changeset
262 size_t len = (size_t) (next - cur - 3);
286
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parents: 178
diff changeset
263 /* Remove I: or R: at the beginning and \r\n at the end */
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parents: 178
diff changeset
264 strv_append(&retval, cur + 2, len);
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parents: 178
diff changeset
265 }
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diff changeset
266 cur = next ? (next + 1) : NULL;
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parents: 178
diff changeset
267 }
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parents: 178
diff changeset
268 return retval;
68
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
269 }
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
270
http://wald.intevation.org/projects/trustbridge/