trunk/src/tls_openssl.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2015 Attila Molnar <attilamolnar@hush.com>
 *  Copyright (c) 2015 Adam <Adam@anope.org>
 *  Copyright (c) 2005-2016 ircd-hybrid development team
 *
 *  This program 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 program 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 program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 *  USA
 */

/*! \file tls_openssl.c
 * \brief Includes all OpenSSL-specific TLS functions
 * \version $Id$
 */

#include "stdinc.h"
#include "tls.h"
#include "conf.h"
#include "log.h"
#include "misc.h"
#include "memory.h"

#ifdef HAVE_TLS_OPENSSL

static int TLS_initialized;

/*
 * report_crypto_errors - Dump crypto error list to log
 */
static void
report_crypto_errors(void)
{
  unsigned long e = 0;

  while ((e = ERR_get_error()))
    ilog(LOG_TYPE_IRCD, "SSL error: %s", ERR_error_string(e, 0));
}

static int
always_accept_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
{
  return 1;
}

int
tls_is_initialized(void)
{
  return TLS_initialized;
}

/* tls_init()
 *
 * inputs       - nothing
 * output       - nothing
 * side effects - setups SSL context.
 */
void
tls_init(void)
{
  SSL_load_error_strings();
  SSLeay_add_ssl_algorithms();

  if (!(ConfigServerInfo.tls_ctx.server_ctx = SSL_CTX_new(SSLv23_server_method())))
  {
    const char *s = ERR_lib_error_string(ERR_get_error());

    fprintf(stderr, "ERROR: Could not initialize the SSL Server context -- %s\n", s);
    ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the SSL Server context -- %s", s);
    exit(EXIT_FAILURE);
    return;  /* Not reached */
  }

  SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_TICKET);
  SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_DH_USE|SSL_OP_CIPHER_SERVER_PREFERENCE);
  SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.server_ctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,
                     always_accept_verify_cb);
  SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.server_ctx, SSL_SESS_CACHE_OFF);
  SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");

#ifndef OPENSSL_NO_ECDH
  EC_KEY *key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);

  if (key)
  {
    SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
    EC_KEY_free(key);
  }

  SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_ECDH_USE);
#endif

  if (!(ConfigServerInfo.tls_ctx.client_ctx = SSL_CTX_new(SSLv23_client_method())))
  {
    const char *s = ERR_lib_error_string(ERR_get_error());

    fprintf(stderr, "ERROR: Could not initialize the SSL Client context -- %s\n", s);
    ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the SSL Client context -- %s", s);
    exit(EXIT_FAILURE);
    return;  /* Not reached */
  }

  SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_TICKET);
  SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_SINGLE_DH_USE);
  SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.client_ctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,
                     always_accept_verify_cb);
  SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.client_ctx, SSL_SESS_CACHE_OFF);
}

int
tls_new_cred(void)
{
  TLS_initialized = 0;

  if (!ConfigServerInfo.ssl_certificate_file || !ConfigServerInfo.rsa_private_key_file)
    return 1;

  if (SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_certificate_file) <= 0 ||
      SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.ssl_certificate_file) <= 0)
  {
    report_crypto_errors();
    return 0;
  }

  if (SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0 ||
      SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0)
  {
    report_crypto_errors();
    return 0;
  }

  if (!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.server_ctx) ||
      !SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.client_ctx))
  {
    report_crypto_errors();
    return 0;
  }

  if (ConfigServerInfo.ssl_dh_param_file)
  {
    BIO *file = BIO_new_file(ConfigServerInfo.ssl_dh_param_file, "r");

    if (file)
    {
      DH *dh = PEM_read_bio_DHparams(file, NULL, NULL, NULL);

      BIO_free(file);

      if (dh)
      {
        if (DH_size(dh) >= 256)
          SSL_CTX_set_tmp_dh(ConfigServerInfo.tls_ctx.server_ctx, dh);
        else
          ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- need at least a 2048 bit DH prime size");

        DH_free(dh);
      }
    }
    else
      ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- could not open/read Diffie-Hellman parameter file");
  }

#ifndef OPENSSL_NO_ECDH
  if (ConfigServerInfo.ssl_dh_elliptic_curve)
  {
    int nid = 0;
    EC_KEY *key = NULL;

    if ((nid = OBJ_sn2nid(ConfigServerInfo.ssl_dh_elliptic_curve)) == 0)
      goto set_default_curve;

    if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
      goto set_default_curve;

    SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
    EC_KEY_free(key);
  }
  else
  {
    EC_KEY *key;

set_default_curve:

    key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);

    if (key)
    {
      SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
      EC_KEY_free(key);
    }
  }
#endif

  if (ConfigServerInfo.ssl_message_digest_algorithm == NULL)
    ConfigServerInfo.message_digest_algorithm = EVP_sha256();
  else
  {
    ConfigServerInfo.message_digest_algorithm = EVP_get_digestbyname(ConfigServerInfo.ssl_message_digest_algorithm);

    if (ConfigServerInfo.message_digest_algorithm == NULL)
    {
      ConfigServerInfo.message_digest_algorithm = EVP_sha256();
      ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_message_digest_algorithm -- unknown message digest algorithm");
    }
  }

  if (ConfigServerInfo.ssl_cipher_list)
    SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_cipher_list);

  TLS_initialized = 1;
  return 1;
}

const char *
tls_get_cipher(const tls_data_t *tls_data)
{
  static char buffer[IRCD_BUFSIZE];
  int bits = 0;
  SSL *ssl = *tls_data;

  SSL_CIPHER_get_bits(SSL_get_current_cipher(ssl), &bits);

  snprintf(buffer, sizeof(buffer), "%s-%s-%d", SSL_get_version(ssl),
           SSL_get_cipher(ssl), bits);
  return buffer;
}

int
tls_isusing(tls_data_t *tls_data)
{
  SSL *ssl = *tls_data;
  return ssl != NULL;
}

void
tls_free(tls_data_t *tls_data)
{
  SSL_free(*tls_data);
  *tls_data = NULL;
}

int
tls_read(tls_data_t *tls_data, char *buf, size_t bufsize, int *want_write)
{
  SSL *ssl = *tls_data;
  int length = SSL_read(ssl, buf, bufsize);

  /* Translate openssl error codes, sigh */
  if (length < 0)
  {
    switch (SSL_get_error(ssl, length))
    {
      case SSL_ERROR_WANT_WRITE:
      {
        /* OpenSSL wants to write, we signal this to the caller and do nothing about that here */
        *want_write = 1;
        break;
      }
      case SSL_ERROR_WANT_READ:
        errno = EWOULDBLOCK;
      case SSL_ERROR_SYSCALL:
        break;
      case SSL_ERROR_SSL:
        if (errno == EAGAIN)
          break;
      /* Fall through */
      default:
        length = errno = 0;
    }
  }

  return length;
}

int
tls_write(tls_data_t *tls_data, const char *buf, size_t bufsize, int *want_read)
{
  SSL *ssl = *tls_data;
  int retlen = SSL_write(ssl, buf, bufsize);

  /* Translate openssl error codes, sigh */
  if (retlen < 0)
  {
    switch (SSL_get_error(ssl, retlen))
    {
      case SSL_ERROR_WANT_READ:
        *want_read = 1;
        break;  /* Retry later, don't register for write events */
      case SSL_ERROR_WANT_WRITE:
        errno = EWOULDBLOCK;
        break;
      case SSL_ERROR_SYSCALL:
        break;
      case SSL_ERROR_SSL:
        if (errno == EAGAIN)
          break;
      /* Fall through */
      default:
        retlen = errno = 0;  /* Either an SSL-specific error or EOF */
    }
  }

  return retlen;
}

void
tls_shutdown(tls_data_t *tls_data)
{
  SSL *ssl = *tls_data;

  SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);

  if (!SSL_shutdown(ssl))
    SSL_shutdown(ssl);
}

int
tls_new(tls_data_t *tls_data, int fd, tls_role_t role)
{
  SSL *ssl;

  if (role == TLS_ROLE_SERVER)
    ssl = SSL_new(ConfigServerInfo.tls_ctx.server_ctx);
  else
    ssl = SSL_new(ConfigServerInfo.tls_ctx.client_ctx);

  if (!ssl)
  {
    ilog(LOG_TYPE_IRCD, "SSL_new() ERROR! -- %s",
         ERR_error_string(ERR_get_error(), NULL));
    return 0;
  }

  *tls_data = ssl;
  SSL_set_fd(ssl, fd);
  return 1;
}

int
tls_set_ciphers(tls_data_t *tls_data, const char *cipher_list)
{
  SSL_set_cipher_list(*tls_data, cipher_list);
  return 1;
}

tls_handshake_status_t
tls_handshake(tls_data_t *tls_data, tls_role_t role, const char **errstr)
{
  SSL *ssl = *tls_data;
  int ret;

  if (role == TLS_ROLE_SERVER)
    ret = SSL_accept(ssl);
  else
    ret = SSL_connect(ssl);

  if (ret > 0)
    return TLS_HANDSHAKE_DONE;

  switch (SSL_get_error(ssl, ret))
  {
    case SSL_ERROR_WANT_WRITE:
      return TLS_HANDSHAKE_WANT_WRITE;
    case SSL_ERROR_WANT_READ:
      return TLS_HANDSHAKE_WANT_READ;
    default:
    {
      const char *error = ERR_error_string(ERR_get_error(), NULL);

      if (errstr)
        *errstr = error;

      return TLS_HANDSHAKE_ERROR;
    }
  }
}

int
tls_verify_cert(tls_data_t *tls_data, tls_md_t digest, char **fingerprint)
{
  SSL *ssl = *tls_data;
  X509 *cert = SSL_get_peer_certificate(ssl);
  unsigned int n;
  char buf[EVP_MAX_MD_SIZE * 2 + 1];
  unsigned char md[EVP_MAX_MD_SIZE];
  int ret = 0;

  /* Accept NULL return from SSL_get_peer_certificate */
  if (!cert)
    return 1;

  int res = SSL_get_verify_result(ssl);
  if (res == X509_V_OK || res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN ||
      res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE ||
      res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
  {
    ret = 1;

    if (X509_digest(cert, digest, md, &n))
    {
      binary_to_hex(md, buf, n);
      *fingerprint = xstrdup(buf);
    }
  }

  X509_free(cert);
  return ret;
}
#endif  /* HAVE_TLS_OPENSSL */
Revision:	7271
Committed:	Sat Feb 6 20:47:15 2016 UTC (9 years, 6 months ago) by michael
Content type:	text/x-csrc
File size:	10894 byte(s)
Log Message:	- Don't exit out with GnuTLS when there's no key and/or certificate
#	User	Rev	Content
1	michael	7105	/*
2			* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3			*
4	michael	7148	* Copyright (c) 2015 Attila Molnar <attilamolnar@hush.com>
5			* Copyright (c) 2015 Adam <Adam@anope.org>
6	michael	7164	* Copyright (c) 2005-2016 ircd-hybrid development team
7	michael	7105	*
8			* This program is free software; you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation; either version 2 of the License, or
11			* (at your option) any later version.
12			*
13			* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
21			* USA
22			*/
23
24			/*! \file tls_openssl.c
25			* \brief Includes all OpenSSL-specific TLS functions
26			* \version $Id$
27			*/
28
29			#include "stdinc.h"
30			#include "tls.h"
31			#include "conf.h"
32			#include "log.h"
33	michael	7152	#include "misc.h"
34	michael	7105	#include "memory.h"
35
36			#ifdef HAVE_TLS_OPENSSL
37
38	michael	7271	static int TLS_initialized;
39
40	michael	7152	/*
41			* report_crypto_errors - Dump crypto error list to log
42			*/
43			static void
44			report_crypto_errors(void)
45			{
46			unsigned long e = 0;
47
48			while ((e = ERR_get_error()))
49			ilog(LOG_TYPE_IRCD, "SSL error: %s", ERR_error_string(e, 0));
50			}
51
52	michael	7105	static int
53			always_accept_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
54			{
55			return 1;
56			}
57
58	michael	7271	int
59			tls_is_initialized(void)
60			{
61			return TLS_initialized;
62			}
63
64	michael	7105	/* tls_init()
65			*
66			* inputs - nothing
67			* output - nothing
68			* side effects - setups SSL context.
69			*/
70			void
71			tls_init(void)
72			{
73			SSL_load_error_strings();
74			SSLeay_add_ssl_algorithms();
75
76			if (!(ConfigServerInfo.tls_ctx.server_ctx = SSL_CTX_new(SSLv23_server_method())))
77			{
78			const char *s = ERR_lib_error_string(ERR_get_error());
79
80			fprintf(stderr, "ERROR: Could not initialize the SSL Server context -- %s\n", s);
81			ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the SSL Server context -- %s", s);
82			exit(EXIT_FAILURE);
83			return; /* Not reached */
84			}
85
86			SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_NO_SSLv2\|SSL_OP_NO_SSLv3\|SSL_OP_NO_TICKET);
87			SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_DH_USE\|SSL_OP_CIPHER_SERVER_PREFERENCE);
88			SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.server_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE,
89			always_accept_verify_cb);
90			SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.server_ctx, SSL_SESS_CACHE_OFF);
91			SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");
92
93	michael	7192	#ifndef OPENSSL_NO_ECDH
94	michael	7233	EC_KEY *key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
95
96			if (key)
97	michael	7105	{
98	michael	7233	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
99			EC_KEY_free(key);
100	michael	7105	}
101
102			SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_ECDH_USE);
103			#endif
104
105			if (!(ConfigServerInfo.tls_ctx.client_ctx = SSL_CTX_new(SSLv23_client_method())))
106			{
107			const char *s = ERR_lib_error_string(ERR_get_error());
108
109			fprintf(stderr, "ERROR: Could not initialize the SSL Client context -- %s\n", s);
110			ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the SSL Client context -- %s", s);
111			exit(EXIT_FAILURE);
112			return; /* Not reached */
113			}
114
115			SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_NO_SSLv2\|SSL_OP_NO_SSLv3\|SSL_OP_NO_TICKET);
116			SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_SINGLE_DH_USE);
117			SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.client_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE,
118			always_accept_verify_cb);
119			SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.client_ctx, SSL_SESS_CACHE_OFF);
120			}
121
122			int
123			tls_new_cred(void)
124			{
125	michael	7271	TLS_initialized = 0;
126
127	michael	7105	if (!ConfigServerInfo.ssl_certificate_file \|\| !ConfigServerInfo.rsa_private_key_file)
128			return 1;
129
130			if (SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_certificate_file) <= 0 \|\|
131			SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.ssl_certificate_file) <= 0)
132			{
133			report_crypto_errors();
134			return 0;
135			}
136
137			if (SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0 \|\|
138			SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0)
139			{
140			report_crypto_errors();
141			return 0;
142			}
143
144			if (!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.server_ctx) \|\|
145			!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.client_ctx))
146			{
147			report_crypto_errors();
148			return 0;
149			}
150
151			if (ConfigServerInfo.ssl_dh_param_file)
152			{
153			BIO *file = BIO_new_file(ConfigServerInfo.ssl_dh_param_file, "r");
154
155			if (file)
156			{
157			DH *dh = PEM_read_bio_DHparams(file, NULL, NULL, NULL);
158
159			BIO_free(file);
160
161			if (dh)
162			{
163			if (DH_size(dh) >= 256)
164			SSL_CTX_set_tmp_dh(ConfigServerInfo.tls_ctx.server_ctx, dh);
165			else
166			ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- need at least a 2048 bit DH prime size");
167
168			DH_free(dh);
169			}
170			}
171			else
172			ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- could not open/read Diffie-Hellman parameter file");
173			}
174
175	michael	7192	#ifndef OPENSSL_NO_ECDH
176	michael	7124	if (ConfigServerInfo.ssl_dh_elliptic_curve)
177	michael	7105	{
178			int nid = 0;
179			EC_KEY *key = NULL;
180
181			if ((nid = OBJ_sn2nid(ConfigServerInfo.ssl_dh_elliptic_curve)) == 0)
182			goto set_default_curve;
183
184			if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
185			goto set_default_curve;
186
187			SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
188			EC_KEY_free(key);
189			}
190			else
191			{
192			EC_KEY *key;
193
194			set_default_curve:
195
196			key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
197
198			if (key)
199			{
200			SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
201			EC_KEY_free(key);
202			}
203			}
204			#endif
205
206			if (ConfigServerInfo.ssl_message_digest_algorithm == NULL)
207			ConfigServerInfo.message_digest_algorithm = EVP_sha256();
208			else
209			{
210			ConfigServerInfo.message_digest_algorithm = EVP_get_digestbyname(ConfigServerInfo.ssl_message_digest_algorithm);
211	michael	7124
212	michael	7105	if (ConfigServerInfo.message_digest_algorithm == NULL)
213			{
214			ConfigServerInfo.message_digest_algorithm = EVP_sha256();
215			ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_message_digest_algorithm -- unknown message digest algorithm");
216			}
217			}
218
219	michael	7190	if (ConfigServerInfo.ssl_cipher_list)
220			SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_cipher_list);
221
222	michael	7271	TLS_initialized = 1;
223	michael	7105	return 1;
224			}
225
226			const char *
227			tls_get_cipher(const tls_data_t *tls_data)
228			{
229			static char buffer[IRCD_BUFSIZE];
230			int bits = 0;
231			SSL ssl = tls_data;
232
233			SSL_CIPHER_get_bits(SSL_get_current_cipher(ssl), &bits);
234
235			snprintf(buffer, sizeof(buffer), "%s-%s-%d", SSL_get_version(ssl),
236			SSL_get_cipher(ssl), bits);
237			return buffer;
238			}
239
240			int
241			tls_isusing(tls_data_t *tls_data)
242			{
243			SSL ssl = tls_data;
244	michael	7124	return ssl != NULL;
245	michael	7105	}
246
247			void
248			tls_free(tls_data_t *tls_data)
249			{
250			SSL_free(*tls_data);
251			*tls_data = NULL;
252			}
253
254			int
255			tls_read(tls_data_t tls_data, char buf, size_t bufsize, int *want_write)
256			{
257			SSL ssl = tls_data;
258			int length = SSL_read(ssl, buf, bufsize);
259
260			/* Translate openssl error codes, sigh */
261			if (length < 0)
262			{
263			switch (SSL_get_error(ssl, length))
264			{
265			case SSL_ERROR_WANT_WRITE:
266			{
267			/* OpenSSL wants to write, we signal this to the caller and do nothing about that here */
268			*want_write = 1;
269			break;
270			}
271			case SSL_ERROR_WANT_READ:
272			errno = EWOULDBLOCK;
273			case SSL_ERROR_SYSCALL:
274			break;
275			case SSL_ERROR_SSL:
276			if (errno == EAGAIN)
277			break;
278			/* Fall through */
279			default:
280			length = errno = 0;
281			}
282			}
283
284			return length;
285			}
286
287			int
288			tls_write(tls_data_t tls_data, const char buf, size_t bufsize, int *want_read)
289			{
290			SSL ssl = tls_data;
291			int retlen = SSL_write(ssl, buf, bufsize);
292
293			/* Translate openssl error codes, sigh */
294			if (retlen < 0)
295			{
296			switch (SSL_get_error(ssl, retlen))
297			{
298			case SSL_ERROR_WANT_READ:
299			*want_read = 1;
300			break; /* Retry later, don't register for write events */
301			case SSL_ERROR_WANT_WRITE:
302			errno = EWOULDBLOCK;
303			break;
304			case SSL_ERROR_SYSCALL:
305			break;
306			case SSL_ERROR_SSL:
307			if (errno == EAGAIN)
308			break;
309			/* Fall through */
310			default:
311			retlen = errno = 0; /* Either an SSL-specific error or EOF */
312			}
313			}
314
315			return retlen;
316			}
317
318			void
319			tls_shutdown(tls_data_t *tls_data)
320			{
321			SSL ssl = tls_data;
322
323			SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
324
325			if (!SSL_shutdown(ssl))
326			SSL_shutdown(ssl);
327			}
328
329			int
330			tls_new(tls_data_t *tls_data, int fd, tls_role_t role)
331			{
332			SSL *ssl;
333
334			if (role == TLS_ROLE_SERVER)
335			ssl = SSL_new(ConfigServerInfo.tls_ctx.server_ctx);
336			else
337			ssl = SSL_new(ConfigServerInfo.tls_ctx.client_ctx);
338
339			if (!ssl)
340			{
341			ilog(LOG_TYPE_IRCD, "SSL_new() ERROR! -- %s",
342			ERR_error_string(ERR_get_error(), NULL));
343			return 0;
344			}
345
346			*tls_data = ssl;
347			SSL_set_fd(ssl, fd);
348			return 1;
349			}
350
351			int
352			tls_set_ciphers(tls_data_t tls_data, const char cipher_list)
353			{
354			SSL_set_cipher_list(*tls_data, cipher_list);
355			return 1;
356			}
357
358			tls_handshake_status_t
359			tls_handshake(tls_data_t tls_data, tls_role_t role, const char *errstr)
360			{
361			SSL ssl = tls_data;
362			int ret;
363
364			if (role == TLS_ROLE_SERVER)
365			ret = SSL_accept(ssl);
366			else
367			ret = SSL_connect(ssl);
368
369			if (ret > 0)
370			return TLS_HANDSHAKE_DONE;
371
372			switch (SSL_get_error(ssl, ret))
373			{
374			case SSL_ERROR_WANT_WRITE:
375			return TLS_HANDSHAKE_WANT_WRITE;
376			case SSL_ERROR_WANT_READ:
377			return TLS_HANDSHAKE_WANT_READ;
378			default:
379			{
380			const char *error = ERR_error_string(ERR_get_error(), NULL);
381
382			if (errstr)
383			*errstr = error;
384
385			return TLS_HANDSHAKE_ERROR;
386			}
387			}
388			}
389
390			int
391	michael	7142	tls_verify_cert(tls_data_t tls_data, tls_md_t digest, char *fingerprint)
392	michael	7105	{
393			SSL ssl = tls_data;
394			X509 *cert = SSL_get_peer_certificate(ssl);
395			unsigned int n;
396			char buf[EVP_MAX_MD_SIZE * 2 + 1];
397			unsigned char md[EVP_MAX_MD_SIZE];
398			int ret = 0;
399
400			/* Accept NULL return from SSL_get_peer_certificate */
401			if (!cert)
402			return 1;
403
404			int res = SSL_get_verify_result(ssl);
405			if (res == X509_V_OK \|\| res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN \|\|
406			res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE \|\|
407			res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
408			{
409			ret = 1;
410
411			if (X509_digest(cert, digest, md, &n))
412			{
413			binary_to_hex(md, buf, n);
414			*fingerprint = xstrdup(buf);
415			}
416			}
417
418			X509_free(cert);
419			return ret;
420			}
421			#endif /* HAVE_TLS_OPENSSL */