2 Copyright (C) 2012-2015 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/certificate.cc
21 * @brief Certificate class.
25 #include "certificate.h"
26 #include "compose.hpp"
27 #include "exceptions.h"
29 #include "dcp_assert.h"
30 #include <libxml++/nodes/element.h>
31 #include <openssl/x509.h>
32 #include <openssl/ssl.h>
33 #include <openssl/asn1.h>
34 #include <openssl/err.h>
35 #include <boost/algorithm/string.hpp>
43 using std::stringstream;
46 static string const begin_certificate = "-----BEGIN CERTIFICATE-----";
47 static string const end_certificate = "-----END CERTIFICATE-----";
49 /** @param c X509 certificate, which this object will take ownership of */
50 Certificate::Certificate (X509* c)
57 /** Load an X509 certificate from a string.
58 * @param cert String to read from.
60 Certificate::Certificate (string cert)
68 * @param other Certificate to copy.
70 Certificate::Certificate (Certificate const & other)
74 read_string (other.certificate (true));
77 /** Read a certificate from a string.
78 * @param cert String to read.
81 Certificate::read_string (string cert)
83 /* Reformat cert so that it has line breaks every 64 characters.
84 See http://comments.gmane.org/gmane.comp.encryption.openssl.user/55593
87 stringstream s (cert);
92 boost::algorithm::trim (line);
93 if (line != begin_certificate) {
94 throw MiscError ("missing BEGIN line in certificate");
100 while (getline (s, line)) {
101 boost::algorithm::trim (line);
102 if (line == end_certificate) {
110 throw MiscError ("missing END line in certificate");
113 /* Make up the fixed version */
115 string fixed = begin_certificate + "\n";
116 while (!base64.empty ()) {
117 size_t const t = min (size_t(64), base64.length());
118 fixed += base64.substr (0, t) + "\n";
119 base64 = base64.substr (t, base64.length() - t);
122 fixed += end_certificate;
124 BIO* bio = BIO_new_mem_buf (const_cast<char *> (fixed.c_str ()), -1);
126 throw MiscError ("could not create memory BIO");
129 _certificate = PEM_read_bio_X509 (bio, 0, 0, 0);
131 throw MiscError ("could not read X509 certificate from memory BIO");
138 Certificate::~Certificate ()
140 X509_free (_certificate);
141 RSA_free (_public_key);
144 /** operator= for Certificate.
145 * @param other Certificate to read from.
148 Certificate::operator= (Certificate const & other)
150 if (this == &other) {
154 X509_free (_certificate);
156 RSA_free (_public_key);
159 read_string (other.certificate (true));
164 /** Return the certificate as a string.
165 * @param with_begin_end true to include the -----BEGIN CERTIFICATE--- / -----END CERTIFICATE----- markers.
166 * @return Certificate string.
169 Certificate::certificate (bool with_begin_end) const
171 DCP_ASSERT (_certificate);
173 BIO* bio = BIO_new (BIO_s_mem ());
175 throw MiscError ("could not create memory BIO");
178 PEM_write_bio_X509 (bio, _certificate);
182 long int const data_length = BIO_get_mem_data (bio, &data);
183 for (long int i = 0; i < data_length; ++i) {
189 if (!with_begin_end) {
190 boost::replace_all (s, begin_certificate + "\n", "");
191 boost::replace_all (s, "\n" + end_certificate + "\n", "");
197 /** @return Certificate's issuer, in the form
198 * dnqualifier=<dnQualififer>,CN=<commonName>,OU=<organizationalUnitName>,O=<organizationName>
199 * and with + signs escaped to \+
202 Certificate::issuer () const
204 DCP_ASSERT (_certificate);
205 return name_for_xml (X509_get_issuer_name (_certificate));
209 Certificate::asn_to_utf8 (ASN1_STRING* s)
211 unsigned char* buf = 0;
212 ASN1_STRING_to_UTF8 (&buf, s);
213 string const u (reinterpret_cast<char *> (buf));
219 Certificate::get_name_part (X509_NAME* n, int nid)
222 p = X509_NAME_get_index_by_NID (n, nid, p);
226 return asn_to_utf8 (X509_NAME_ENTRY_get_data (X509_NAME_get_entry (n, p)));
230 Certificate::name_for_xml (X509_NAME* name)
234 BIO* bio = BIO_new (BIO_s_mem ());
236 throw MiscError ("could not create memory BIO");
239 X509_NAME_print_ex (bio, name, 0, XN_FLAG_RFC2253);
240 int n = BIO_pending (bio);
241 char* result = new char[n + 1];
242 n = BIO_read (bio, result, n);
254 Certificate::subject () const
256 DCP_ASSERT (_certificate);
258 return name_for_xml (X509_get_subject_name (_certificate));
262 Certificate::subject_common_name () const
264 DCP_ASSERT (_certificate);
266 return get_name_part (X509_get_subject_name (_certificate), NID_commonName);
270 Certificate::subject_organization_name () const
272 DCP_ASSERT (_certificate);
274 return get_name_part (X509_get_subject_name (_certificate), NID_organizationName);
278 Certificate::subject_organizational_unit_name () const
280 DCP_ASSERT (_certificate);
282 return get_name_part (X509_get_subject_name (_certificate), NID_organizationalUnitName);
286 Certificate::serial () const
288 DCP_ASSERT (_certificate);
290 ASN1_INTEGER* s = X509_get_serialNumber (_certificate);
293 BIGNUM* b = ASN1_INTEGER_to_BN (s, 0);
294 char* c = BN_bn2dec (b);
304 Certificate::thumbprint () const
306 DCP_ASSERT (_certificate);
308 uint8_t buffer[8192];
310 i2d_X509_CINF (_certificate->cert_info, &p);
311 unsigned int const length = p - buffer;
312 if (length > sizeof (buffer)) {
313 throw MiscError ("buffer too small to generate thumbprint");
318 SHA1_Update (&sha, buffer, length);
320 SHA1_Final (digest, &sha);
322 char digest_base64[64];
323 return Kumu::base64encode (digest, 20, digest_base64, 64);
326 /** @return RSA public key from this Certificate. Caller must not free the returned value. */
328 Certificate::public_key () const
330 DCP_ASSERT (_certificate);
336 EVP_PKEY* key = X509_get_pubkey (_certificate);
338 throw MiscError ("could not get public key from certificate");
341 _public_key = EVP_PKEY_get1_RSA (key);
343 throw MiscError (String::compose ("could not get RSA public key (%1)", ERR_error_string (ERR_get_error(), 0)));
350 dcp::operator== (Certificate const & a, Certificate const & b)
352 return a.certificate() == b.certificate();
356 dcp::operator< (Certificate const & a, Certificate const & b)
358 return a.certificate() < b.certificate();
362 dcp::operator<< (ostream& s, Certificate const & c)
364 s << c.certificate();