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>
44 /** @param c X509 certificate, which this object will take ownership of */
45 Certificate::Certificate (X509* c)
52 /** Load an X509 certificate from a string.
53 * @param cert String to read from.
55 Certificate::Certificate (string cert)
63 * @param other Certificate to copy.
65 Certificate::Certificate (Certificate const & other)
69 if (other._certificate) {
70 read_string (other.certificate (true));
74 /** Read a certificate from a string.
75 * @param cert String to read.
78 Certificate::read_string (string cert)
80 BIO* bio = BIO_new_mem_buf (const_cast<char *> (cert.c_str ()), -1);
82 throw MiscError ("could not create memory BIO");
85 _certificate = PEM_read_bio_X509 (bio, 0, 0, 0);
87 throw MiscError ("could not read X509 certificate from memory BIO");
94 Certificate::~Certificate ()
96 X509_free (_certificate);
97 RSA_free (_public_key);
100 /** operator= for Certificate.
101 * @param other Certificate to read from.
104 Certificate::operator= (Certificate const & other)
106 if (this == &other) {
110 X509_free (_certificate);
112 RSA_free (_public_key);
115 read_string (other.certificate (true));
120 /** Return the certificate as a string.
121 * @param with_begin_end true to include the -----BEGIN CERTIFICATE--- / -----END CERTIFICATE----- markers.
122 * @return Certificate string.
125 Certificate::certificate (bool with_begin_end) const
127 DCP_ASSERT (_certificate);
129 BIO* bio = BIO_new (BIO_s_mem ());
131 throw MiscError ("could not create memory BIO");
134 PEM_write_bio_X509 (bio, _certificate);
138 long int const data_length = BIO_get_mem_data (bio, &data);
139 for (long int i = 0; i < data_length; ++i) {
145 if (!with_begin_end) {
146 boost::replace_all (s, "-----BEGIN CERTIFICATE-----\n", "");
147 boost::replace_all (s, "\n-----END CERTIFICATE-----\n", "");
153 /** @return Certificate's issuer, in the form
154 * dnqualifier=<dnQualififer>,CN=<commonName>,OU=<organizationalUnitName>,O=<organizationName>
155 * and with + signs escaped to \+
158 Certificate::issuer () const
160 DCP_ASSERT (_certificate);
161 return name_for_xml (X509_get_issuer_name (_certificate));
165 Certificate::asn_to_utf8 (ASN1_STRING* s)
167 unsigned char* buf = 0;
168 ASN1_STRING_to_UTF8 (&buf, s);
169 string const u (reinterpret_cast<char *> (buf));
175 Certificate::get_name_part (X509_NAME* n, int nid)
178 p = X509_NAME_get_index_by_NID (n, nid, p);
182 return asn_to_utf8 (X509_NAME_ENTRY_get_data (X509_NAME_get_entry (n, p)));
186 Certificate::name_for_xml (X509_NAME* name)
190 BIO* bio = BIO_new (BIO_s_mem ());
192 throw MiscError ("could not create memory BIO");
195 X509_NAME_print_ex (bio, name, 0, XN_FLAG_RFC2253);
196 int n = BIO_pending (bio);
197 char* result = new char[n + 1];
198 n = BIO_read (bio, result, n);
210 Certificate::subject () const
212 DCP_ASSERT (_certificate);
214 return name_for_xml (X509_get_subject_name (_certificate));
218 Certificate::subject_common_name () const
220 DCP_ASSERT (_certificate);
222 return get_name_part (X509_get_subject_name (_certificate), NID_commonName);
226 Certificate::subject_organization_name () const
228 DCP_ASSERT (_certificate);
230 return get_name_part (X509_get_subject_name (_certificate), NID_organizationName);
234 Certificate::subject_organizational_unit_name () const
236 DCP_ASSERT (_certificate);
238 return get_name_part (X509_get_subject_name (_certificate), NID_organizationalUnitName);
242 Certificate::serial () const
244 DCP_ASSERT (_certificate);
246 ASN1_INTEGER* s = X509_get_serialNumber (_certificate);
249 BIGNUM* b = ASN1_INTEGER_to_BN (s, 0);
250 char* c = BN_bn2dec (b);
260 Certificate::thumbprint () const
262 DCP_ASSERT (_certificate);
264 uint8_t buffer[8192];
266 i2d_X509_CINF (_certificate->cert_info, &p);
267 unsigned int const length = p - buffer;
268 if (length > sizeof (buffer)) {
269 throw MiscError ("buffer too small to generate thumbprint");
274 SHA1_Update (&sha, buffer, length);
276 SHA1_Final (digest, &sha);
278 char digest_base64[64];
279 return Kumu::base64encode (digest, 20, digest_base64, 64);
282 /** @return RSA public key from this Certificate. Caller must not free the returned value. */
284 Certificate::public_key () const
286 DCP_ASSERT (_certificate);
292 EVP_PKEY* key = X509_get_pubkey (_certificate);
294 throw MiscError ("could not get public key from certificate");
297 _public_key = EVP_PKEY_get1_RSA (key);
299 throw MiscError (String::compose ("could not get RSA public key (%1)", ERR_error_string (ERR_get_error(), 0)));
306 dcp::operator== (Certificate const & a, Certificate const & b)
308 return a.certificate() == b.certificate();
312 dcp::operator< (Certificate const & a, Certificate const & b)
314 return a.certificate() < b.certificate();
318 dcp::operator<< (ostream& s, Certificate const & c)
320 s << c.certificate();