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annotate common/listutil.c @ 1024:5ec1cf66922e

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author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 02 Sep 2014 16:04:59 +0200
parents 698b6a9bd75e
children edbf5e5e88f4
rev   line source
404
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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 #include "logging.h"
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21
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22 #ifdef RELEASE_BUILD
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23 #include "pubkey-release.h"
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24 #else
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25 #include "pubkey-test.h"
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26 #endif
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27
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28 #pragma GCC diagnostic ignored "-Wconversion"
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29 /* Polarssl mh.h contains a conversion which gcc warns about */
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30 #include <polarssl/pk.h>
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31 #include <polarssl/base64.h>
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32 #include <polarssl/sha256.h>
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33 #pragma GCC diagnostic pop
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34
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35 #define MAX_FILESIZE (MAX_LINE_LENGTH * MAX_LINES)
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36
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37 #define READ_FILE_UNREADABLE -1
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38 #define READ_FILE_TOO_LARGE -2
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39 #define READ_FILE_NO_MEMORY -3
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40 #define READ_FILE_READ_FAILED -4
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41 #define READ_FILE_INVALID_CALL -5
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42 int
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43 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 if (!file_name || !data || !size || !max_size)
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50 {
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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 {
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62 fclose(f);
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63 return READ_FILE_UNREADABLE;
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64 }
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65
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66 fseek(f, 0, SEEK_SET);
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67
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68 if (file_size + 1 == 0)
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69 {
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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 {
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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
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81 *data = (char *) malloc( *size + 1 );
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82 if (*data == NULL)
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83 {
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84 fclose(f);
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85 return READ_FILE_NO_MEMORY;
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86 }
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87
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88 if (fread(*data, 1, *size, f) != *size)
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89 {
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90 free(*data);
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91 fclose(f);
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92 return READ_FILE_READ_FAILED;
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93 }
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94
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95 fclose(f);
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96
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97 (*data)[*size] = '\0';
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98
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99 return 0;
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100 }
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101
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102 int verify_list(const char *data, const 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
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108 /* Modulus / 8 are the necessary bytes. */
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109 #ifndef TRUSTBRIDGE_RSA_KEY_SIZE
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110 # error "Key size undefined"
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111 #endif
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112 const size_t sig_b64_size = TRUSTBRIDGE_RSA_KEY_SIZE / 8 * 4 / 3;
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113 size_t sig_size = TRUSTBRIDGE_RSA_KEY_SIZE / 8;
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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 {
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122 return -1;
93
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123 }
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124
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125 /* Fetch the signature from the first line od data */
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126 p = strchr(data, '\r');
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127 if (p == 0 || (unsigned int)(p - (data + 2)) != sig_b64_size)
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128 {
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129 /* printf("Invalid data. Signature might be too long.\n"); */
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130 return -1;
31
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131 }
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132 strncpy(signature_b64, data + 2, sig_b64_size);
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133 signature_b64[sig_b64_size] = '\0';
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134
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135 ret = base64_decode(signature, &sig_size,
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136 (unsigned char *)signature_b64, sig_b64_size);
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137
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138 if (ret != 0 || sig_size != TRUSTBRIDGE_RSA_KEY_SIZE / 8)
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139 {
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140 /* printf("failed to decode signature\n"); */
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141 return -1;
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142 }
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diff changeset
143
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144 /* Hash is calculated over the data without the first line.
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145 * linebreaks are \r\n so the first char of the new line is
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146 * p+2 */
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diff changeset
147 p += 2;
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148 /* Size of the data to hash is the size - signature line
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diff changeset
149 * signature line is sig_b64_size - "S:" and - "\r\n" so -4*/
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diff changeset
150 sha256((unsigned char *)p, size - sig_b64_size - 4, hash, 0);
28
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parents: 22
diff changeset
151
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152 pk_init(&pub_key_ctx);
28
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diff changeset
153
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154 ret = pk_parse_public_key(&pub_key_ctx, public_key_pem,
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diff changeset
155 public_key_pem_size);
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diff changeset
156 if (ret != 0)
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diff changeset
157 {
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158 ERRORPRINTF ("pk_parse_public_key failed with -0x%04x\n\n", -ret);
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159 pk_free(&pub_key_ctx);
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160 return ret;
28
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parents: 22
diff changeset
161 }
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parents: 22
diff changeset
162
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163 ret = pk_verify(&pub_key_ctx, POLARSSL_MD_SHA256, hash, 0,
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164 signature, sig_size);
31
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diff changeset
165
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166 if (ret != 0)
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167 {
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168 ERRORPRINTF ("pk_verify failed with -0x%04x\n\n", -ret);
31
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diff changeset
169 }
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170 pk_free(&pub_key_ctx);
31
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diff changeset
171
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172 return ret;
28
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parents: 22
diff changeset
173 }
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parents: 22
diff changeset
174
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Andre Heinecke <aheinecke@intevation.de>
parents: 22
diff changeset
175 list_status_t read_and_verify_list(const char *file_name, char **data,
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176 size_t *size)
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diff changeset
177 {
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178 list_status_t retval = UnknownError;
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179 *data = NULL;
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180 *size = 0;
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diff changeset
181 int ret = 0;
4
9849250f50f2 Start implementation of certificatelist parser
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182
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183 ret = read_file(file_name, data, size, MAX_FILESIZE);
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184
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185 /* printf ("Ret: %i \n", ret); */
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186 if (ret != 0)
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187 {
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188 if (ret == READ_FILE_TOO_LARGE)
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189 {
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190 return TooLarge;
31
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diff changeset
191 }
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192 if (ret == READ_FILE_UNREADABLE)
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193 {
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194 /* TODO: work with errno ? */
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195 /* errsv = errno; */
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196 /* perror("read_and_verify_list(), READ_FILE_UNREADABLE:"); */
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197 return SeekFailed;
31
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diff changeset
198 }
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199 if (ret == READ_FILE_READ_FAILED)
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Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
200 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
201 /* TODO: work with ferror() or feof() ? */
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
202 return ReadFailed;
31
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
203 }
905
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diff changeset
204 return UnknownError;
4
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
205 }
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
206
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
207 if (!*data || !*size)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
208 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
209 /* File is probably empty */
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diff changeset
210 return UnknownError;
4
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
211 }
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
212
905
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
213 if (**data != 'S')
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
214 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
215 retval = InvalidFormat;
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
216 }
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
217 else
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
218 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
219 ret = verify_list (*data, *size);
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
220 if (ret == 0)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
221 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
222 /* Hooray */
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
223 return Valid;
31
37fc66967517 Implement signature verification wiht polarssl
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diff changeset
224 }
905
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diff changeset
225 if (ret == -1)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
226 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
227 /* our error */
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
228 retval = InvalidFormat;
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
229 }
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
230 else
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
231 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
232 retval = InvalidSignature;
31
37fc66967517 Implement signature verification wiht polarssl
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diff changeset
233 }
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
234 }
9
2ad9a96518e3 Actually parse all elements in the list
Andre Heinecke <aheinecke@intevation.de>
parents: 7
diff changeset
235
905
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
236 if (retval != Valid && *data)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
237 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
238 free(*data);
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
239 *data = NULL;
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
240 *size = 0;
4
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
241 }
905
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
242 return retval;
4
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
243 }
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
244
286
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
245 char **
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
246 get_certs_from_list (char *data, const size_t size)
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
247 {
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
248 char *cur = data;
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
249 char **retval = NULL;
68
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
250
286
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
251 if (!data || !size)
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
252 {
626
f595fcbe3e76 Replace "normal printfs" with DEBUG / ERROR printf macros
Andre Heinecke <andre.heinecke@intevation.de>
parents: 404
diff changeset
253 ERRORPRINTF ("Invalid call to get_certs_to_remove \n");
286
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
254 return NULL;
68
8ffbb48528ae Add certificate installation for windows
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parents: 66
diff changeset
255 }
286
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
256
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
257 while (cur)
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
258 {
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
259 char *next = strchr(cur, '\n');
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
260 if (strlen(cur) > 3 && (cur[0] == 'I' || cur[0] == 'R') &&
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
261 next - cur > 4)
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
262 {
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
263 size_t len = (size_t) (next - cur - 3);
286
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
264 /* Remove I: or R: at the beginning and \r\n at the end */
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
265 strv_append(&retval, cur + 2, len);
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
266 }
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
267 cur = next ? (next + 1) : NULL;
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
268 }
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
269 return retval;
68
8ffbb48528ae Add certificate installation for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 66
diff changeset
270 }
8ffbb48528ae Add certificate installation for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 66
diff changeset
271
http://wald.intevation.org/projects/trustbridge/