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annotate common/listutil.c @ 160:bf4bfd8843bd

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Add memory allocating base64 decode function
author Andre Heinecke <aheinecke@intevation.de>
date Tue, 25 Mar 2014 10:07:12 +0000
parents 0798b9e35725
children b0579d4fa186
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 MAX_LINE_LENGTH * MAX_LINES
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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 #define READ_FILE_INVALID_CALL -5
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44 static int read_file(const char *file_name, char **data, size_t *size,
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45 const size_t max_size)
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46 {
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47 FILE *f;
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48 long file_size;
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49
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50 if (!file_name || !data || !size || !max_size) {
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51 return READ_FILE_INVALID_CALL;
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52 }
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53
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54 f = fopen(file_name, "rb");
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55 if (f == NULL)
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56 return READ_FILE_UNREADABLE;
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57
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58 fseek(f, 0, SEEK_END);
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59 file_size = ftell(f);
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60 if (file_size <= 0){
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61 fclose(f);
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62 return READ_FILE_UNREADABLE;
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63 }
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64
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65 fseek(f, 0, SEEK_SET);
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66
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67 if (file_size + 1 == 0) {
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68 fclose(f);
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69 return READ_FILE_TOO_LARGE;
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70 }
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71 *size = (size_t) file_size;
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72
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73 if (*size > max_size) {
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74 fclose(f);
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75 return READ_FILE_TOO_LARGE;
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76 }
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77
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78 *data = (char *) malloc( *size + 1 );
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79 if (*data == NULL) {
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80 fclose(f);
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81 return READ_FILE_NO_MEMORY;
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82 }
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83
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84 if (fread(*data, 1, *size, f) != *size) {
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85 free(*data);
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86 fclose(f);
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87 return READ_FILE_READ_FAILED;
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88 }
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89
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90 fclose(f);
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91
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92 (*data)[*size] = '\0';
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93
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94 return 0;
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95 }
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96
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97 int verify_list(const char *data, const size_t size)
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98 {
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99 int ret = -1;
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100 pk_context pub_key_ctx;
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101 char *p;
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102 /* Fixed key size of 3072 implies the sizes*/
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103 const size_t sig_b64_size = 512;
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104 size_t sig_size = 384;
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105
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106 char signature_b64[sig_b64_size + 1];
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107 unsigned char signature[sig_size];
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108 /* Hash algroithm is sha256 */
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109 unsigned char hash[32];
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110
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111 if (!data || !size) {
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112 return -1;
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113 }
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114
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115 /* Fetch the signature from the first line od data */
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116 p = strchr(data, '\r');
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117 if (p == 0 || (unsigned int)(p - (data + 2)) != sig_b64_size) {
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118 /* printf("Invalid data. Signature might be too long.\n"); */
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119 return -1;
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120 }
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121 strncpy(signature_b64, data + 2, sig_b64_size);
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122 signature_b64[sig_b64_size] = '\0';
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123
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124 ret = base64_decode(signature, &sig_size,
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125 (unsigned char *)signature_b64, sig_b64_size);
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126
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127 if (ret != 0 || sig_size != 384) {
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128 /* printf("failed to decode signature\n"); */
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129 return -1;
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130 }
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131
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132 /* Hash is calculated over the data without the first line.
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133 * linebreaks are \r\n so the first char of the new line is
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134 * p+2 */
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135 p += 2;
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136 /* Size of the data to hash is the size - signature line
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137 * signature line is sig_b64_size - "S:" and - "\r\n" so -4*/
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138 sha256((unsigned char *)p, size - sig_b64_size - 4, hash, 0);
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139
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140 pk_init(&pub_key_ctx);
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141 #if 0
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142 {
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143 int i;
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144 FILE *foo = fopen("/tmp/testdump", "w");
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145 FILE *foo2 = fopen("/tmp/rawdump", "w");
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146 for (i=0; i< (int)(size - sig_b64_size - 2); i++)
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147 fprintf (foo, "%c", p[i]);
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148 for (i=0; i< (int)(size); i++)
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149 fprintf (foo2, "%c", data[i]);
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150 fclose(foo);
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151 printf ("Hash: \n");
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152 for (i=0; i<32; i++) {
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153 printf ("%x", hash[i]);
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154 }
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155 printf("\n");
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156 }
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157 #endif
28
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158
31
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159 ret = pk_parse_public_key(&pub_key_ctx, public_key_pem,
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160 public_key_pem_size);
28
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161 if (ret != 0) {
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162 printf("pk_parse_public_key failed with -0x%04x\n\n", -ret);
31
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163 pk_free(&pub_key_ctx);
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164 return ret;
28
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165 }
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166
31
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167 ret = pk_verify(&pub_key_ctx, POLARSSL_MD_SHA256, hash, 0,
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168 signature, sig_size);
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169
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170 if (ret != 0) {
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171 printf("pk_verify failed with -0x%04x\n\n", -ret);
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172 }
28
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173 pk_free(&pub_key_ctx);
31
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174
28
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175 return ret;
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176 }
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177
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178 list_status_t read_and_verify_list(const char *file_name, char **data,
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179 size_t *size)
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180 {
4
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181 list_status_t retval = UnknownError;
7
992c0ec57660 Add unit tests make CertificateList work.
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182 *data = NULL;
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183 *size = 0;
31
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184 int ret = 0;
4
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185
31
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186 ret = read_file(file_name, data, size, MAX_FILESIZE);
4
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187
40
5cb1eb928253 Clean up debug output / functions
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188 /* printf ("Ret: %i \n", ret); */
31
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189 if (ret != 0) {
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190 if (ret == READ_FILE_TOO_LARGE) {
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191 return TooLarge;
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192 }
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193 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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194 /* TODO: work with errno ? */
31
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195 return SeekFailed;
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196 }
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197 if (ret == READ_FILE_READ_FAILED) {
66
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198 /* TODO: work with ferror() or feof() ? */
31
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199 return ReadFailed;
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200 }
4
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201 return UnknownError;
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202 }
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parents:
diff changeset
203
31
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diff changeset
204 if (!*data || !*size) {
40
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diff changeset
205 /* File is probably empty */
31
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206 return UnknownError;
4
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207 }
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diff changeset
208
31
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diff changeset
209 if (**data != 'S') {
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210 retval = InvalidFormat;
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diff changeset
211 } else {
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212 ret = verify_list (*data, *size);
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213 if (ret == 0) {
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diff changeset
214 /* Hooray */
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215 return Valid;
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216 }
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diff changeset
217 if (ret == -1) {
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diff changeset
218 /* our error */
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219 retval = InvalidFormat;
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220 } else {
92
4980b0deb773 Fix memleak in case of invalid signature
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diff changeset
221 retval = InvalidSignature;
31
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diff changeset
222 }
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223 }
9
2ad9a96518e3 Actually parse all elements in the list
Andre Heinecke <aheinecke@intevation.de>
parents: 7
diff changeset
224
7
992c0ec57660 Add unit tests make CertificateList work.
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diff changeset
225 if (retval != Valid && *data) {
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diff changeset
226 free(*data);
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diff changeset
227 *data = NULL;
4
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228 *size = 0;
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229 }
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230 return retval;
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231 }
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Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
232
68
8ffbb48528ae Add certificate installation for windows
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diff changeset
233 char **get_certs_to_remove(const char *data, const size_t size) {
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diff changeset
234
8ffbb48528ae Add certificate installation for windows
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diff changeset
235 /* TODO */
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diff changeset
236 if (!data || !size) {
8ffbb48528ae Add certificate installation for windows
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diff changeset
237 printf ("Invalid call to get_certs_to_remove \n");
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diff changeset
238 return NULL;
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
239 }
8ffbb48528ae Add certificate installation for windows
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diff changeset
240 return NULL;
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
241 }
8ffbb48528ae Add certificate installation for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 66
diff changeset
242
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
243 char **get_certs_to_install(const char *data, const size_t size) {
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
244
8ffbb48528ae Add certificate installation for windows
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diff changeset
245 /* TODO */
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parents: 66
diff changeset
246 if (!data || !size) {
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
247 printf ("Invalid call to get_certs_to_install \n");
8ffbb48528ae Add certificate installation for windows
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diff changeset
248 return NULL;
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
249 }
8ffbb48528ae Add certificate installation for windows
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diff changeset
250 return NULL;
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
251 }
http://wald.intevation.org/projects/trustbridge/