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annotate common/listutil.c @ 367:9491782a8f5a

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Added dialog to create a signed certificate list file.
author Raimund Renkert <rrenkert@intevation.de>
date Tue, 15 Apr 2014 09:43:53 +0200
parents f6ce186cebc2
children 17e1c8f37d72
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 #include "strhelp.h"
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13
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14 #ifdef RELEASE_BUILD
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15 #include "pubkey-release.h"
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16 #else
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17 #include "pubkey-test.h"
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18 #endif
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19
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20 #pragma GCC diagnostic ignored "-Wconversion"
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21 /* Polarssl mh.h contains a conversion which gcc warns about */
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22 #include <polarssl/pk.h>
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23 #include <polarssl/base64.h>
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24 #include <polarssl/sha256.h>
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25 #pragma GCC diagnostic pop
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26
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27 #define MAX_FILESIZE (MAX_LINE_LENGTH * MAX_LINES)
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29 /**
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30 * @brief Read a file into memory.
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31 *
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32 * The caller needs to free data
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33 *
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34 * @param[in] fileName Name of the file.
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35 * @param[out] data the file content
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36 * @param[out] size size in bytes of the file content.
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37 * @param[in] max_size the maximum amount of bytes to read.
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38 *
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39 * @return 0 on success an error code otherwise.
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40 */
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41 #define READ_FILE_UNREADABLE -1
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42 #define READ_FILE_TOO_LARGE -2
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43 #define READ_FILE_NO_MEMORY -3
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44 #define READ_FILE_READ_FAILED -4
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45 #define READ_FILE_INVALID_CALL -5
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46 static int read_file(const char *file_name, char **data, size_t *size,
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47 const size_t max_size)
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48 {
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49 FILE *f;
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50 long file_size;
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51
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52 if (!file_name || !data || !size || !max_size) {
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53 return READ_FILE_INVALID_CALL;
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54 }
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55
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56 f = fopen(file_name, "rb");
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57 if (f == NULL)
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58 return READ_FILE_UNREADABLE;
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59
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60 fseek(f, 0, SEEK_END);
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61 file_size = ftell(f);
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62 if (file_size <= 0){
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63 fclose(f);
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64 return READ_FILE_UNREADABLE;
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65 }
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66
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67 fseek(f, 0, SEEK_SET);
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68
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69 if (file_size + 1 == 0) {
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70 fclose(f);
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71 return READ_FILE_TOO_LARGE;
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72 }
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73 *size = (size_t) file_size;
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74
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75 if (*size > max_size) {
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76 fclose(f);
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77 return READ_FILE_TOO_LARGE;
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78 }
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79
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80 *data = (char *) malloc( *size + 1 );
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81 if (*data == NULL) {
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82 fclose(f);
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83 return READ_FILE_NO_MEMORY;
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84 }
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85
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86 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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87 free(*data);
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88 fclose(f);
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89 return READ_FILE_READ_FAILED;
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90 }
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91
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92 fclose(f);
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93
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94 (*data)[*size] = '\0';
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95
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96 return 0;
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97 }
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98
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99 int verify_list(const char *data, const size_t size)
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100 {
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101 int ret = -1;
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102 pk_context pub_key_ctx;
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103 char *p;
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104 /* Fixed key size of 3072 implies the sizes*/
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105 const size_t sig_b64_size = 512;
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106 size_t sig_size = 384;
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107
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108 char signature_b64[sig_b64_size + 1];
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109 unsigned char signature[sig_size];
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110 /* Hash algroithm is sha256 */
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111 unsigned char hash[32];
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112
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113 if (!data || !size) {
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114 return -1;
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115 }
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116
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117 /* Fetch the signature from the first line od data */
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118 p = strchr(data, '\r');
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119 if (p == 0 || (unsigned int)(p - (data + 2)) != sig_b64_size) {
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120 /* printf("Invalid data. Signature might be too long.\n"); */
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121 return -1;
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122 }
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123 strncpy(signature_b64, data + 2, sig_b64_size);
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124 signature_b64[sig_b64_size] = '\0';
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125
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126 ret = base64_decode(signature, &sig_size,
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127 (unsigned char *)signature_b64, sig_b64_size);
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128
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129 if (ret != 0 || sig_size != 384) {
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130 /* printf("failed to decode signature\n"); */
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131 return -1;
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132 }
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133
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134 /* Hash is calculated over the data without the first line.
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135 * linebreaks are \r\n so the first char of the new line is
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136 * p+2 */
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137 p += 2;
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138 /* Size of the data to hash is the size - signature line
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139 * signature line is sig_b64_size - "S:" and - "\r\n" so -4*/
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140 sha256((unsigned char *)p, size - sig_b64_size - 4, hash, 0);
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141
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142 pk_init(&pub_key_ctx);
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143 #if 0
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144 {
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145 int i;
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146 FILE *foo = fopen("/tmp/testdump", "w");
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147 FILE *foo2 = fopen("/tmp/rawdump", "w");
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148 for (i=0; i< (int)(size - sig_b64_size - 2); i++)
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149 fprintf (foo, "%c", p[i]);
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150 for (i=0; i< (int)(size); i++)
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151 fprintf (foo2, "%c", data[i]);
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152 fclose(foo);
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153 printf ("Hash: \n");
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154 for (i=0; i<32; i++) {
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155 printf ("%x", hash[i]);
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156 }
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157 printf("\n");
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158 }
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diff changeset
159 #endif
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160
31
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161 ret = pk_parse_public_key(&pub_key_ctx, public_key_pem,
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162 public_key_pem_size);
28
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163 if (ret != 0) {
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164 printf("pk_parse_public_key failed with -0x%04x\n\n", -ret);
31
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165 pk_free(&pub_key_ctx);
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166 return ret;
28
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parents: 22
diff changeset
167 }
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parents: 22
diff changeset
168
31
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diff changeset
169 ret = pk_verify(&pub_key_ctx, POLARSSL_MD_SHA256, hash, 0,
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diff changeset
170 signature, sig_size);
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171
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172 if (ret != 0) {
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173 printf("pk_verify failed with -0x%04x\n\n", -ret);
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174 }
28
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diff changeset
175 pk_free(&pub_key_ctx);
31
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diff changeset
176
28
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177 return ret;
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diff changeset
178 }
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179
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diff changeset
180 list_status_t read_and_verify_list(const char *file_name, char **data,
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181 size_t *size)
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182 {
4
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183 list_status_t retval = UnknownError;
7
992c0ec57660 Add unit tests make CertificateList work.
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184 *data = NULL;
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185 *size = 0;
31
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186 int ret = 0;
4
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187
31
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188 ret = read_file(file_name, data, size, MAX_FILESIZE);
4
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189
40
5cb1eb928253 Clean up debug output / functions
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190 /* printf ("Ret: %i \n", ret); */
31
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191 if (ret != 0) {
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192 if (ret == READ_FILE_TOO_LARGE) {
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193 return TooLarge;
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194 }
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195 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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196 /* TODO: work with errno ? */
178
b0579d4fa186 Made macro MAX_FILESIZE saver with brackets. A perror debugging line.
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197 /* errsv = errno; */
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198 /* perror("read_and_verify_list(), READ_FILE_UNREADABLE:"); */
31
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199 return SeekFailed;
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200 }
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diff changeset
201 if (ret == READ_FILE_READ_FAILED) {
66
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diff changeset
202 /* TODO: work with ferror() or feof() ? */
31
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203 return ReadFailed;
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204 }
4
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205 return UnknownError;
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206 }
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diff changeset
207
31
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diff changeset
208 if (!*data || !*size) {
40
5cb1eb928253 Clean up debug output / functions
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diff changeset
209 /* File is probably empty */
31
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210 return UnknownError;
4
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211 }
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parents:
diff changeset
212
31
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diff changeset
213 if (**data != 'S') {
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diff changeset
214 retval = InvalidFormat;
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215 } else {
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216 ret = verify_list (*data, *size);
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217 if (ret == 0) {
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218 /* Hooray */
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219 return Valid;
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diff changeset
220 }
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diff changeset
221 if (ret == -1) {
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diff changeset
222 /* our error */
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223 retval = InvalidFormat;
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224 } else {
92
4980b0deb773 Fix memleak in case of invalid signature
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diff changeset
225 retval = InvalidSignature;
31
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diff changeset
226 }
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diff changeset
227 }
9
2ad9a96518e3 Actually parse all elements in the list
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parents: 7
diff changeset
228
7
992c0ec57660 Add unit tests make CertificateList work.
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parents: 4
diff changeset
229 if (retval != Valid && *data) {
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parents: 4
diff changeset
230 free(*data);
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diff changeset
231 *data = NULL;
4
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232 *size = 0;
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233 }
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234 return retval;
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parents:
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235 }
9849250f50f2 Start implementation of certificatelist parser
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parents:
diff changeset
236
286
881ce5126f07 Add helper function to get all certificates in a list
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diff changeset
237 char **
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parents: 178
diff changeset
238 get_certs_from_list (char *data, const size_t size)
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parents: 178
diff changeset
239 {
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parents: 178
diff changeset
240 char *cur = data;
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
241 char **retval = NULL;
68
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
242
286
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
243 if (!data || !size)
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
244 {
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
245 printf ("Invalid call to get_certs_to_remove \n");
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parents: 178
diff changeset
246 return NULL;
68
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
247 }
286
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
248
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
249 while (cur)
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parents: 178
diff changeset
250 {
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parents: 178
diff changeset
251 char *next = strchr(cur, '\n');
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parents: 178
diff changeset
252 if (strlen(cur) > 3 && (cur[0] == 'I' || cur[0] == 'R') &&
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parents: 178
diff changeset
253 next - cur > 4)
881ce5126f07 Add helper function to get all certificates in a list
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parents: 178
diff changeset
254 {
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
255 size_t len = (size_t) (next - cur - 3);
286
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parents: 178
diff changeset
256 /* Remove I: or R: at the beginning and \r\n at the end */
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Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
257 strv_append(&retval, cur + 2, len);
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parents: 178
diff changeset
258 }
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parents: 178
diff changeset
259 cur = next ? (next + 1) : NULL;
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parents: 178
diff changeset
260 }
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parents: 178
diff changeset
261 return retval;
68
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
262 }
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
263
http://wald.intevation.org/projects/trustbridge/