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annotate common/listutil.c @ 1281:4c200e512f76

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(admin-help) Create list button (screenshot) updated.
author Emanuel Schuetze <emanuel@intevation.de>
date Mon, 29 Sep 2014 11:47:14 +0200
parents 3cd8dd706aaa
children 8d27c6d226cd
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 #ifdef WIN32
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20 #include <share.h>
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21 #endif
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22
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23 #include "strhelp.h"
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24 #include "logging.h"
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25 #include "portpath.h"
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26
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27 #ifdef RELEASE_BUILD
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28 #include "pubkey-release.h"
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29 #else
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30 #include "pubkey-test.h"
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31 #endif
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32
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33 #ifndef __clang__
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34 #pragma GCC diagnostic ignored "-Wconversion"
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35 #endif
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36 /* Polarssl mh.h contains a conversion which gcc warns about */
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37 #include <polarssl/pk.h>
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38 #include <polarssl/base64.h>
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39 #include <polarssl/sha256.h>
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40 #ifndef __clang__
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41 #pragma GCC diagnostic pop
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42 #endif
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43
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44 #define MAX_FILESIZE (MAX_LINE_LENGTH * MAX_LINES)
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45
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46 #define READ_FILE_UNREADABLE -1
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47 #define READ_FILE_TOO_LARGE -2
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48 #define READ_FILE_NO_MEMORY -3
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49 #define READ_FILE_READ_FAILED -4
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50 #define READ_FILE_INVALID_CALL -5
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51 int
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52 read_file(const char *file_name, char **data, size_t *size,
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53 const size_t max_size, FILE **fptr)
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54 {
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55 FILE *f;
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56 long file_size;
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57
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58 if (!file_name || !data || !size || !max_size)
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59 {
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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 = port_fopen_rb(file_name, true);
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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 {
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71 fclose(f);
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72 return READ_FILE_UNREADABLE;
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73 }
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74
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75 fseek(f, 0, SEEK_SET);
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76
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77 if (file_size + 1 == 0)
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78 {
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79 fclose(f);
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80 return READ_FILE_TOO_LARGE;
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81 }
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82 *size = (size_t) file_size;
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83
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84 if (*size > max_size)
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85 {
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86 fclose(f);
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87 return READ_FILE_TOO_LARGE;
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88 }
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89
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90 *data = (char *) malloc( *size + 1 );
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91 if (*data == NULL)
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92 {
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93 fclose(f);
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94 return READ_FILE_NO_MEMORY;
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95 }
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96
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97 if (fread(*data, 1, *size, f) != *size)
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98 {
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99 free(*data);
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100 fclose(f);
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101 return READ_FILE_READ_FAILED;
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102 }
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103
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104 if (fptr)
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105 {
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106 *fptr = f;
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107 }
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108 else
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109 {
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110 fclose(f);
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111 }
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112
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113 (*data)[*size] = '\0';
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114
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115 return 0;
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116 }
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117
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118 int verify_list(const char *data, const size_t size)
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119 {
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120 int ret = -1;
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121 pk_context pub_key_ctx;
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122 char *p;
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123
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124 /* Modulus / 8 are the necessary bytes. */
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125 #ifndef TRUSTBRIDGE_RSA_KEY_SIZE
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126 # error "Key size undefined"
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127 #endif
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128 const size_t sig_b64_size = TRUSTBRIDGE_RSA_KEY_SIZE / 8 * 4 / 3;
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129 size_t sig_size = TRUSTBRIDGE_RSA_KEY_SIZE / 8;
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130
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131 char signature_b64[sig_b64_size + 1];
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132 unsigned char signature[sig_size];
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133 /* Hash algroithm is sha256 */
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134 unsigned char hash[32];
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135
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136 if (!data || !size)
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137 {
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138 return -1;
93
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139 }
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140
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141 /* Fetch the signature from the first line od data */
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parents: 770
diff changeset
142 p = strchr(data, '\r');
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parents: 770
diff changeset
143 if (p == 0 || (unsigned int)(p - (data + 2)) != sig_b64_size)
698b6a9bd75e Fix coding style for C code
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parents: 770
diff changeset
144 {
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diff changeset
145 /* printf("Invalid data. Signature might be too long.\n"); */
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diff changeset
146 return -1;
31
37fc66967517 Implement signature verification wiht polarssl
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parents: 28
diff changeset
147 }
905
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diff changeset
148 strncpy(signature_b64, data + 2, sig_b64_size);
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
149 signature_b64[sig_b64_size] = '\0';
31
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
150
905
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
151 ret = base64_decode(signature, &sig_size,
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
152 (unsigned char *)signature_b64, sig_b64_size);
31
37fc66967517 Implement signature verification wiht polarssl
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parents: 28
diff changeset
153
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parents: 770
diff changeset
154 if (ret != 0 || sig_size != TRUSTBRIDGE_RSA_KEY_SIZE / 8)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
155 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
156 /* printf("failed to decode signature\n"); */
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
157 return -1;
31
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Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
158 }
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
159
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diff changeset
160 /* Hash is calculated over the data without the first line.
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diff changeset
161 * linebreaks are \r\n so the first char of the new line is
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
162 * p+2 */
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Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
163 p += 2;
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Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
164 /* Size of the data to hash is the size - signature line
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Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
165 * signature line is sig_b64_size - "S:" and - "\r\n" so -4*/
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
166 sha256((unsigned char *)p, size - sig_b64_size - 4, hash, 0);
28
e783fd99a9eb Add public key parsing
Andre Heinecke <aheinecke@intevation.de>
parents: 22
diff changeset
167
905
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diff changeset
168 pk_init(&pub_key_ctx);
28
e783fd99a9eb Add public key parsing
Andre Heinecke <aheinecke@intevation.de>
parents: 22
diff changeset
169
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
170 ret = pk_parse_public_key(&pub_key_ctx, public_key_pem,
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
171 public_key_pem_size);
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
172 if (ret != 0)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
173 {
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
174 ERRORPRINTF ("pk_parse_public_key failed with -0x%04x\n\n", -ret);
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175 pk_free(&pub_key_ctx);
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
176 return ret;
28
e783fd99a9eb Add public key parsing
Andre Heinecke <aheinecke@intevation.de>
parents: 22
diff changeset
177 }
e783fd99a9eb Add public key parsing
Andre Heinecke <aheinecke@intevation.de>
parents: 22
diff changeset
178
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
179 ret = pk_verify(&pub_key_ctx, POLARSSL_MD_SHA256, hash, 0,
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
180 signature, sig_size);
31
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
181
905
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diff changeset
182 if (ret != 0)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
183 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
184 ERRORPRINTF ("pk_verify failed with -0x%04x\n\n", -ret);
31
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
185 }
905
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
186 pk_free(&pub_key_ctx);
31
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
187
905
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diff changeset
188 return ret;
28
e783fd99a9eb Add public key parsing
Andre Heinecke <aheinecke@intevation.de>
parents: 22
diff changeset
189 }
e783fd99a9eb Add public key parsing
Andre Heinecke <aheinecke@intevation.de>
parents: 22
diff changeset
190
e783fd99a9eb Add public key parsing
Andre Heinecke <aheinecke@intevation.de>
parents: 22
diff changeset
191 list_status_t read_and_verify_list(const char *file_name, char **data,
e783fd99a9eb Add public key parsing
Andre Heinecke <aheinecke@intevation.de>
parents: 22
diff changeset
192 size_t *size)
e783fd99a9eb Add public key parsing
Andre Heinecke <aheinecke@intevation.de>
parents: 22
diff changeset
193 {
905
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diff changeset
194 list_status_t retval = UnknownError;
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
195 *data = NULL;
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
196 *size = 0;
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
197 int ret = 0;
4
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
198
1081
edbf5e5e88f4 (issue118) Extend verify_binary to carry an open file
Andre Heinecke <andre.heinecke@intevation.de>
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199 ret = read_file(file_name, data, size, MAX_FILESIZE, NULL);
905
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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>
parents: 770
diff changeset
201 /* printf ("Ret: %i \n", ret); */
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
202 if (ret != 0)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
203 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
204 if (ret == READ_FILE_TOO_LARGE)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
205 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
206 return TooLarge;
31
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
207 }
905
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
208 if (ret == READ_FILE_UNREADABLE)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
209 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
210 return SeekFailed;
31
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
211 }
905
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Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
212 if (ret == READ_FILE_READ_FAILED)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
213 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
214 return ReadFailed;
31
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
215 }
905
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
216 return UnknownError;
4
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
217 }
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
218
905
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
219 if (!*data || !*size)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
220 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
221 /* File is probably empty */
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
222 return UnknownError;
4
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
223 }
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
224
905
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
225 if (**data != 'S')
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>
parents: 770
diff changeset
227 retval = InvalidFormat;
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
228 }
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
229 else
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
230 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
231 ret = verify_list (*data, *size);
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
232 if (ret == 0)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
233 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
234 /* Hooray */
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
235 return Valid;
31
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
236 }
905
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
237 if (ret == -1)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
238 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
239 /* our error */
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
240 retval = InvalidFormat;
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
241 }
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
242 else
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
243 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
244 retval = InvalidSignature;
31
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
245 }
37fc66967517 Implement signature verification wiht polarssl
Andre Heinecke <aheinecke@intevation.de>
parents: 28
diff changeset
246 }
9
2ad9a96518e3 Actually parse all elements in the list
Andre Heinecke <aheinecke@intevation.de>
parents: 7
diff changeset
247
905
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
248 if (retval != Valid && *data)
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
249 {
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
250 free(*data);
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
251 *data = NULL;
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
parents: 770
diff changeset
252 *size = 0;
4
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
253 }
905
698b6a9bd75e Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
254 return retval;
4
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
255 }
9849250f50f2 Start implementation of certificatelist parser
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
256
286
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
257 char **
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
258 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
259 {
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
260 char *cur = data;
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
261 char **retval = NULL;
68
8ffbb48528ae Add certificate installation for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 66
diff changeset
262
286
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
263 if (!data || !size)
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
264 {
626
f595fcbe3e76 Replace "normal printfs" with DEBUG / ERROR printf macros
Andre Heinecke <andre.heinecke@intevation.de>
parents: 404
diff changeset
265 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
266 return NULL;
68
8ffbb48528ae Add certificate installation for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 66
diff changeset
267 }
286
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 while (cur)
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
270 {
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
271 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
272 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
273 next - cur > 4)
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
274 {
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
275 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
276 /* 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
277 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
278 }
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
279 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
280 }
881ce5126f07 Add helper function to get all certificates in a list
Andre Heinecke <aheinecke@intevation.de>
parents: 178
diff changeset
281 return retval;
68
8ffbb48528ae Add certificate installation for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 66
diff changeset
282 }
8ffbb48528ae Add certificate installation for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 66
diff changeset
283
http://wald.intevation.org/projects/trustbridge/