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 if (other._certificate) {
75 read_string (other.certificate (true));
79 /** Read a certificate from a string.
80 * @param cert String to read.
83 Certificate::read_string (string cert)
85 /* Reformat cert so that it has line breaks every 64 characters.
86 See http://comments.gmane.org/gmane.comp.encryption.openssl.user/55593
89 stringstream s (cert);
94 boost::algorithm::trim (line);
95 if (line != begin_certificate) {
96 throw MiscError ("missing BEGIN line in certificate");
100 bool got_end = false;
102 while (getline (s, line)) {
103 boost::algorithm::trim (line);
104 if (line == end_certificate) {
112 throw MiscError ("missing END line in certificate");
115 /* Make up the fixed version */
117 string fixed = begin_certificate + "\n";
118 while (!base64.empty ()) {
119 size_t const t = min (size_t(64), base64.length());
120 fixed += base64.substr (0, t) + "\n";
121 base64 = base64.substr (t, base64.length() - t);
124 fixed += end_certificate;
126 BIO* bio = BIO_new_mem_buf (const_cast<char *> (fixed.c_str ()), -1);
128 throw MiscError ("could not create memory BIO");
131 _certificate = PEM_read_bio_X509 (bio, 0, 0, 0);
133 throw MiscError ("could not read X509 certificate from memory BIO");
140 Certificate::~Certificate ()
142 X509_free (_certificate);
143 RSA_free (_public_key);
146 /** operator= for Certificate.
147 * @param other Certificate to read from.
150 Certificate::operator= (Certificate const & other)
152 if (this == &other) {
156 X509_free (_certificate);
158 RSA_free (_public_key);
161 read_string (other.certificate (true));
166 /** Return the certificate as a string.
167 * @param with_begin_end true to include the -----BEGIN CERTIFICATE--- / -----END CERTIFICATE----- markers.
168 * @return Certificate string.
171 Certificate::certificate (bool with_begin_end) const
173 DCP_ASSERT (_certificate);
175 BIO* bio = BIO_new (BIO_s_mem ());
177 throw MiscError ("could not create memory BIO");
180 PEM_write_bio_X509 (bio, _certificate);
184 long int const data_length = BIO_get_mem_data (bio, &data);
185 for (long int i = 0; i < data_length; ++i) {
191 if (!with_begin_end) {
192 boost::replace_all (s, begin_certificate + "\n", "");
193 boost::replace_all (s, "\n" + end_certificate + "\n", "");
199 /** @return Certificate's issuer, in the form
200 * dnqualifier=<dnQualififer>,CN=<commonName>,OU=<organizationalUnitName>,O=<organizationName>
201 * and with + signs escaped to \+
204 Certificate::issuer () const
206 DCP_ASSERT (_certificate);
207 return name_for_xml (X509_get_issuer_name (_certificate));
211 Certificate::asn_to_utf8 (ASN1_STRING* s)
213 unsigned char* buf = 0;
214 ASN1_STRING_to_UTF8 (&buf, s);
215 string const u (reinterpret_cast<char *> (buf));
221 Certificate::get_name_part (X509_NAME* n, int nid)
224 p = X509_NAME_get_index_by_NID (n, nid, p);
228 return asn_to_utf8 (X509_NAME_ENTRY_get_data (X509_NAME_get_entry (n, p)));
232 Certificate::name_for_xml (X509_NAME* name)
236 BIO* bio = BIO_new (BIO_s_mem ());
238 throw MiscError ("could not create memory BIO");
241 X509_NAME_print_ex (bio, name, 0, XN_FLAG_RFC2253);
242 int n = BIO_pending (bio);
243 char* result = new char[n + 1];
244 n = BIO_read (bio, result, n);
256 Certificate::subject () const
258 DCP_ASSERT (_certificate);
260 return name_for_xml (X509_get_subject_name (_certificate));
264 Certificate::subject_common_name () const
266 DCP_ASSERT (_certificate);
268 return get_name_part (X509_get_subject_name (_certificate), NID_commonName);
272 Certificate::subject_organization_name () const
274 DCP_ASSERT (_certificate);
276 return get_name_part (X509_get_subject_name (_certificate), NID_organizationName);
280 Certificate::subject_organizational_unit_name () const
282 DCP_ASSERT (_certificate);
284 return get_name_part (X509_get_subject_name (_certificate), NID_organizationalUnitName);
288 Certificate::serial () const
290 DCP_ASSERT (_certificate);
292 ASN1_INTEGER* s = X509_get_serialNumber (_certificate);
295 BIGNUM* b = ASN1_INTEGER_to_BN (s, 0);
296 char* c = BN_bn2dec (b);
306 Certificate::thumbprint () const
308 DCP_ASSERT (_certificate);
310 uint8_t buffer[8192];
312 i2d_X509_CINF (_certificate->cert_info, &p);
313 unsigned int const length = p - buffer;
314 if (length > sizeof (buffer)) {
315 throw MiscError ("buffer too small to generate thumbprint");
320 SHA1_Update (&sha, buffer, length);
322 SHA1_Final (digest, &sha);
324 char digest_base64[64];
325 return Kumu::base64encode (digest, 20, digest_base64, 64);
328 /** @return RSA public key from this Certificate. Caller must not free the returned value. */
330 Certificate::public_key () const
332 DCP_ASSERT (_certificate);
338 EVP_PKEY* key = X509_get_pubkey (_certificate);
340 throw MiscError ("could not get public key from certificate");
343 _public_key = EVP_PKEY_get1_RSA (key);
345 throw MiscError (String::compose ("could not get RSA public key (%1)", ERR_error_string (ERR_get_error(), 0)));
352 dcp::operator== (Certificate const & a, Certificate const & b)
354 return a.certificate() == b.certificate();
358 dcp::operator< (Certificate const & a, Certificate const & b)
360 return a.certificate() < b.certificate();
364 dcp::operator<< (ostream& s, Certificate const & c)
366 s << c.certificate();