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annotate common/listutil.c @ 28:e783fd99a9eb

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Add public key parsing
author Andre Heinecke <aheinecke@intevation.de>
date Thu, 13 Mar 2014 12:01:33 +0000
parents bc302bbceaf5
children 37fc66967517
rev   line source
4
9849250f50f2 Start implementation of certificatelist parser
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parents:
diff changeset
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>
7
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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 #pragma GCC diagnostic pop
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22
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23 #define MAX_FILESIZE_KB 1024
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24
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25 void handle_errno()
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26 {
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27 printf("Error: %s \n", strerror(errno));
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28 }
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29
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30 list_status_t read_list (const char *file_name, char **data, size_t *size)
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31 {
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32 int fd = -1;
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33 struct stat file_stat;
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34 int rc = 0;
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35 ssize_t bRead = 0;
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36
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37 memset(&file_stat, 0, sizeof(file_stat));
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38
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39 list_status_t retval = UnknownError;
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40
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41 fd = open(file_name, O_RDONLY);
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42 if (fd == -1) {
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43 handle_errno();
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44 retval = StatFailed;
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45 goto cleanup;
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46 }
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47
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48 rc = fstat(fd, &file_stat);
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49 if (rc < 0) {
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50 printf ("Stat failed with rc: %i\n", rc);
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51 retval = StatFailed;
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52 goto cleanup;
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53 }
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54
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55 // Check the size of the file
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56 if (!file_stat.st_size) {
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57 printf("Size zero\n");
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58 retval = StatFailed;
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59 goto cleanup;
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60 }
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61
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62 if (file_stat.st_size / 1024 > MAX_FILESIZE_KB &&
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63 file_stat.st_size > 0) {
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64 printf("File too large\n");
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65 retval = TooLarge;
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66 goto cleanup;
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67 }
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68
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69 *size = (size_t) file_stat.st_size;
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70
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71 *data = (char*) malloc(*size);
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72
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73 if (*data == NULL) {
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74 printf("Malloc failed\n");
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75 retval = UnknownError;
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76 goto cleanup;
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77 }
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78
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79 bRead = read(fd, *data, *size);
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80
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81 if (bRead < 0 || (size_t) bRead != *size) {
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82 printf("Read failed\n");
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83 if (bRead == -1) {
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84 handle_errno();
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85 }
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86 retval = UnknownError;
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87 *size = 0;
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88 if (*data) {
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89 free(*data);
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90 printf("Nulling data\n");
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91 *data = NULL;
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92 }
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93 goto cleanup;
4
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94 }
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95
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96 retval = UnknownValidity;
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97 cleanup:
4
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98
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99 if (fd && fd != -1) {
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100 close(fd);
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101 fd = -1;
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102 }
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103
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104 return retval;
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105 }
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106
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107 /** @brief verify the certificate list
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108 *
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109 * The public key to verify against is the static publicKeyPEM data defined
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110 * in the pubkey header.
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111 *
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112 * @param [in] data the list data
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113 * @param [in] size the size of the data
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114 *
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115 * @returns 0 if the list is valid a polarssl error or -1 otherwise
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116 */
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117 int verify_list(char *data, size_t size)
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118 {
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119 // char *sigstart = data;
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120 int ret = -1;
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121 pk_context pub_key_ctx;
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122 size_t lenpem = strlen((const char*)publicKeyPEM);
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123
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124 pk_init(&pub_key_ctx);
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125
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126 ret = pk_parse_public_key(&pub_key_ctx, publicKeyPEM, lenpem);
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127
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128 if (ret != 0) {
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129 printf("pk_parse_public_key failed with -0x%04x\n\n", -ret);
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130 goto done;
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131 }
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132
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133 done:
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134 pk_free(&pub_key_ctx);
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135 return ret;
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136 }
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137
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138 list_status_t read_and_verify_list(const char *file_name, char **data,
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139 size_t *size)
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140 {
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141 char * signature = NULL;
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142
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143 list_status_t retval = UnknownError;
7
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144 *data = NULL;
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145 *size = 0;
4
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146
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147 retval = read_list(file_name, data, size);
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148
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149 if (retval != UnknownValidity) {
28
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150 printf("Readlist failed\n");
4
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151 return retval;
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152 }
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153
7
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154 if (!data || !*size) {
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155 // should not have happend if read_list works as specified
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156 return UnknownError;
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157 }
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158
9
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parents: 7
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159 signature = *data;
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160
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161 if (*signature != 'S') {
4
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162 printf("Does not start with S\n");
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163 retval = InvalidFormat;
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164 goto cleanup;
4
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165 }
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parents:
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166
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parents: 22
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167 retval = verify_list (*data, *size);
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parents: 7
diff changeset
168
7
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parents: 4
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169 cleanup:
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parents: 4
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170 if (retval != Valid && *data) {
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parents: 4
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171 free(*data);
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172 *data = NULL;
4
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173 *size = 0;
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174 }
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parents:
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175 return retval;
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Andre Heinecke <aheinecke@intevation.de>
parents:
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176 }
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
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177
http://wald.intevation.org/projects/trustbridge/