2 Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/signer_chain.cc
21 * @brief Functions to make signer chains.
24 #include "certificate_chain.h"
25 #include "exceptions.h"
28 #include <openssl/sha.h>
29 #include <openssl/bio.h>
30 #include <openssl/evp.h>
31 #include <boost/filesystem.hpp>
32 #include <boost/algorithm/string.hpp>
39 using std::stringstream;
42 /** Run a shell command.
43 * @param cmd Command to run (UTF8-encoded).
49 /* We need to use CreateProcessW on Windows so that the UTF-8/16 mess
52 int const wn = MultiByteToWideChar (CP_UTF8, 0, cmd.c_str(), -1, 0, 0);
53 wchar_t* buffer = new wchar_t[wn];
54 if (MultiByteToWideChar (CP_UTF8, 0, cmd.c_str(), -1, buffer, wn) == 0) {
61 STARTUPINFOW startup_info;
62 memset (&startup_info, 0, sizeof (startup_info));
63 startup_info.cb = sizeof (startup_info);
64 PROCESS_INFORMATION process_info;
66 /* XXX: this doesn't actually seem to work; failing commands end up with
69 if (CreateProcessW (0, buffer, 0, 0, FALSE, CREATE_NO_WINDOW, 0, 0, &startup_info, &process_info)) {
70 WaitForSingleObject (process_info.hProcess, INFINITE);
72 if (GetExitCodeProcess (process_info.hProcess, &c)) {
75 CloseHandle (process_info.hProcess);
76 CloseHandle (process_info.hThread);
81 cmd += " 2> /dev/null";
82 int const r = system (cmd.c_str ());
83 int const code = WEXITSTATUS (r);
87 s << "error " << code << " in " << cmd << " within " << boost::filesystem::current_path();
88 throw dcp::MiscError (s.str());
92 /** Extract a public key from a private key and create a SHA1 digest of it.
93 * @param private_key Private key
94 * @param openssl openssl binary name (or full path if openssl is not on the system path).
95 * @return SHA1 digest of corresponding public key, with escaped / characters.
98 public_key_digest (boost::filesystem::path private_key, boost::filesystem::path openssl)
100 boost::filesystem::path public_name = private_key.string() + ".public";
102 /* Create the public key from the private key */
104 s << "\"" << openssl.string() << "\" rsa -outform PEM -pubout -in " << private_key.string() << " -out " << public_name.string ();
105 command (s.str().c_str ());
107 /* Read in the public key from the file */
110 ifstream f (public_name.string().c_str ());
112 throw dcp::MiscError ("public key not found");
119 if (line.length() >= 10 && line.substr(0, 10) == "-----BEGIN") {
121 } else if (line.length() >= 8 && line.substr(0, 8) == "-----END") {
128 /* Decode the base64 of the public key */
130 unsigned char buffer[512];
131 int const N = dcp::base64_decode (pub, buffer, 1024);
133 /* Hash it with SHA1 (without the first 24 bytes, for reasons that are not entirely clear) */
136 if (!SHA1_Init (&context)) {
137 throw dcp::MiscError ("could not init SHA1 context");
140 if (!SHA1_Update (&context, buffer + 24, N - 24)) {
141 throw dcp::MiscError ("could not update SHA1 digest");
144 unsigned char digest[SHA_DIGEST_LENGTH];
145 if (!SHA1_Final (digest, &context)) {
146 throw dcp::MiscError ("could not finish SHA1 digest");
149 char digest_base64[64];
150 string dig = Kumu::base64encode (digest, SHA_DIGEST_LENGTH, digest_base64, 64);
151 #ifdef LIBDCP_WINDOWS
152 boost::replace_all (dig, "/", "\\/");
154 boost::replace_all (dig, "/", "\\\\/");
159 boost::filesystem::path
160 dcp::make_certificate_chain (boost::filesystem::path openssl)
162 boost::filesystem::path directory = boost::filesystem::unique_path ();
163 boost::filesystem::create_directories (directory);
165 boost::filesystem::path const cwd = boost::filesystem::current_path ();
166 boost::filesystem::current_path (directory);
168 string quoted_openssl = "\"" + openssl.string() + "\"";
170 command (quoted_openssl + " genrsa -out ca.key 2048");
173 ofstream f ("ca.cnf");
175 << "distinguished_name = req_distinguished_name\n"
176 << "x509_extensions = v3_ca\n"
178 << "basicConstraints = critical,CA:true,pathlen:3\n"
179 << "keyUsage = keyCertSign,cRLSign\n"
180 << "subjectKeyIdentifier = hash\n"
181 << "authorityKeyIdentifier = keyid:always,issuer:always\n"
182 << "[ req_distinguished_name ]\n"
183 << "O = Unique organization name\n"
184 << "OU = Organization unit\n"
185 << "CN = Entity and dnQualifier\n";
188 string const ca_subject = "/O=example.org/OU=example.org/CN=.smpte-430-2.ROOT.NOT_FOR_PRODUCTION/dnQualifier=" + public_key_digest ("ca.key", openssl);
193 << " req -new -x509 -sha256 -config ca.cnf -days 3650 -set_serial 5"
194 << " -subj " << ca_subject << " -key ca.key -outform PEM -out ca.self-signed.pem";
195 command (c.str().c_str());
198 command (quoted_openssl + " genrsa -out intermediate.key 2048");
201 ofstream f ("intermediate.cnf");
203 << "distinguished_name = req_distinguished_name\n"
204 << "x509_extensions = v3_ca\n"
206 << "basicConstraints = critical,CA:true,pathlen:2\n"
207 << "keyUsage = keyCertSign,cRLSign\n"
208 << "subjectKeyIdentifier = hash\n"
209 << "authorityKeyIdentifier = keyid:always,issuer:always\n"
210 << "[ req_distinguished_name ]\n"
211 << "O = Unique organization name\n"
212 << "OU = Organization unit\n"
213 << "CN = Entity and dnQualifier\n";
216 string const inter_subject = "/O=example.org/OU=example.org/CN=.smpte-430-2.INTERMEDIATE.NOT_FOR_PRODUCTION/dnQualifier="
217 + public_key_digest ("intermediate.key", openssl);
222 << " req -new -config intermediate.cnf -days 3649 -subj " << inter_subject << " -key intermediate.key -out intermediate.csr";
223 command (s.str().c_str());
229 " x509 -req -sha256 -days 3649 -CA ca.self-signed.pem -CAkey ca.key -set_serial 6"
230 " -in intermediate.csr -extfile intermediate.cnf -extensions v3_ca -out intermediate.signed.pem"
233 command (quoted_openssl + " genrsa -out leaf.key 2048");
236 ofstream f ("leaf.cnf");
238 << "distinguished_name = req_distinguished_name\n"
239 << "x509_extensions = v3_ca\n"
241 << "basicConstraints = critical,CA:false\n"
242 << "keyUsage = digitalSignature,keyEncipherment\n"
243 << "subjectKeyIdentifier = hash\n"
244 << "authorityKeyIdentifier = keyid,issuer:always\n"
245 << "[ req_distinguished_name ]\n"
246 << "O = Unique organization name\n"
247 << "OU = Organization unit\n"
248 << "CN = Entity and dnQualifier\n";
251 string const leaf_subject = "/O=example.org/OU=example.org/CN=CS.smpte-430-2.LEAF.NOT_FOR_PRODUCTION/dnQualifier="
252 + public_key_digest ("leaf.key", openssl);
256 s << quoted_openssl << " req -new -config leaf.cnf -days 3648 -subj " << leaf_subject << " -key leaf.key -outform PEM -out leaf.csr";
257 command (s.str().c_str());
262 " x509 -req -sha256 -days 3648 -CA intermediate.signed.pem -CAkey intermediate.key"
263 " -set_serial 7 -in leaf.csr -extfile leaf.cnf -extensions v3_ca -out leaf.signed.pem"
266 boost::filesystem::current_path (cwd);