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/* Copyright (C) 2011 TightVNC Team. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <os/tls.h>
#include <iomanip>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sstream>
#include <sys/types.h>
#include <time.h>
using namespace std;
#ifdef HAVE_GNUTLS
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#ifndef HAVE_GNUTLS_X509_CRT_PRINT
#define UNKNOWN_SUBJECT(err) \
do { \
ss << "unknown subject (" << gnutls_strerror(err) << "), "; \
} while (0)
#define UNKNOWN_ISSUER(err) \
do { \
ss << "unknown issuer (" << gnutls_strerror(err) << "), "; \
} while (0)
static void
hexprint(ostringstream &ss, const char *data, size_t len)
{
size_t j;
char tmp[3];
if (len == 0)
ss << "00";
else {
for (j = 0; j < len; j++) {
snprintf(tmp, sizeof(tmp), "%.2x", (unsigned char) data[j]);
ss << tmp;
}
}
}
/* Implementation based on gnutls_x509_crt_print from GNUTLS */
int
gnutls_x509_crt_print(gnutls_x509_crt_t cert,
gnutls_certificate_print_formats_t format,
gnutls_datum_t * out)
{
ostringstream ss;
int err;
char *dn;
size_t dn_size = 0;
/* Subject */
err = gnutls_x509_crt_get_dn(cert, NULL, &dn_size);
if (err != GNUTLS_E_SHORT_MEMORY_BUFFER)
UNKNOWN_SUBJECT(err);
else {
dn = (char *)malloc(dn_size);
if (dn == NULL) {
UNKNOWN_SUBJECT(GNUTLS_E_MEMORY_ERROR);
} else {
err = gnutls_x509_crt_get_dn(cert, dn, &dn_size);
if (err < 0) {
UNKNOWN_SUBJECT(err);
} else
ss << "subject `" << dn << "', ";
free(dn);
}
}
/* Issuer */
dn = NULL;
dn_size = 0;
err = gnutls_x509_crt_get_issuer_dn(cert, NULL, &dn_size);
if (err != GNUTLS_E_SHORT_MEMORY_BUFFER)
UNKNOWN_ISSUER(err);
else {
dn = (char *)malloc(dn_size);
if (dn == NULL) {
UNKNOWN_ISSUER(GNUTLS_E_MEMORY_ERROR);
} else {
err = gnutls_x509_crt_get_issuer_dn(cert, dn, &dn_size);
if (err < 0)
UNKNOWN_ISSUER(err);
else
ss << "issuer `" << dn << "', ";
free(dn);
}
}
/* Key algorithm and size */
unsigned int bits;
const char *name;
name = gnutls_pk_algorithm_get_name( (gnutls_pk_algorithm_t)
gnutls_x509_crt_get_pk_algorithm(cert, &bits));
if (name == NULL)
name = "Unknown";
ss << name << " key " << bits << " bits, ";
/* Signature algorithm */
err = gnutls_x509_crt_get_signature_algorithm(cert);
if (err < 0) {
ss << "unknown signature algorithm (" << gnutls_strerror(err)
<< "), ";
} else {
const char *name;
name = gnutls_sign_algorithm_get_name((gnutls_sign_algorithm_t)err);
if (name == NULL)
name = "Unknown";
ss << "signed using " << name;
if (err == GNUTLS_SIGN_RSA_MD5 || err == GNUTLS_SIGN_RSA_MD2)
ss << " (broken!)";
ss << ", ";
}
/* Validity */
time_t tim;
char s[42];
size_t max = sizeof(s);
struct tm t;
tim = gnutls_x509_crt_get_activation_time(cert);
if (gmtime_r(&tim, &t) == NULL)
ss << "unknown activation (" << (unsigned long) tim << ")";
else if (strftime(s, max, "%Y-%m-%d %H:%M:%S UTC", &t) == 0)
ss << "failed activation (" << (unsigned long) tim << ")";
else
ss << "activated `" << s << "'";
ss << ", ";
tim = gnutls_x509_crt_get_expiration_time(cert);
if (gmtime_r(&tim, &t) == NULL)
ss << "unknown expiry (" << (unsigned long) tim << ")";
else if (strftime(s, max, "%Y-%m-%d %H:%M:%S UTC", &t) == 0)
ss << "failed expiry (" << (unsigned long) tim << ")";
else
ss << "expires `" << s << "'";
ss << ", ";
/* Fingerprint */
char buffer[20];
size_t size = sizeof(buffer);
err = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_SHA1, buffer, &size);
if (err < 0)
ss << "unknown fingerprint (" << gnutls_strerror(err) << ")";
else {
ss << "SHA-1 fingerprint `";
hexprint(ss, buffer, size);
ss << "'";
}
out->data = (unsigned char *) strdup(ss.str().c_str());
if (out->data == NULL)
return GNUTLS_E_MEMORY_ERROR;
out->size = strlen((char *)out->data);
return 0;
}
#endif /* HAVE_GNUTLS_X509_CRT_PRINT */
#endif /* HAVE_GNUTLS */
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