trunk/src/tls_openssl.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  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 "rsa.h"
#include "memory.h"

#ifdef HAVE_TLS_OPENSSL

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

/* 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");

#if OPENSSL_VERSION_NUMBER >= 0x009080FFL && !defined(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)
{
  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");
  }

#if OPENSSL_VERSION_NUMBER >= 0x009080FFL && !defined(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");
    }
  }

  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:	7142
Committed:	Thu Jan 28 09:56:49 2016 UTC (9 years, 7 months ago) by michael
Content type:	text/x-csrc
File size:	10395 byte(s)
Log Message:	- Remove useless raw_result -- from Adam
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 2005-2016 ircd-hybrid development team
5	*
6	* This program is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	* USA
20	*/
21
22	/*! \file tls_openssl.c
23	* \brief Includes all OpenSSL-specific TLS functions
24	* \version $Id$
25	*/
26
27	#include "stdinc.h"
28	#include "tls.h"
29	#include "conf.h"
30	#include "log.h"
31	#include "rsa.h"
32	#include "memory.h"
33
34	#ifdef HAVE_TLS_OPENSSL
35
36	static int
37	always_accept_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
38	{
39	return 1;
40	}
41
42	/* tls_init()
43	*
44	* inputs - nothing
45	* output - nothing
46	* side effects - setups SSL context.
47	*/
48	void
49	tls_init(void)
50	{
51	SSL_load_error_strings();
52	SSLeay_add_ssl_algorithms();
53
54	if (!(ConfigServerInfo.tls_ctx.server_ctx = SSL_CTX_new(SSLv23_server_method())))
55	{
56	const char *s = ERR_lib_error_string(ERR_get_error());
57
58	fprintf(stderr, "ERROR: Could not initialize the SSL Server context -- %s\n", s);
59	ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the SSL Server context -- %s", s);
60	exit(EXIT_FAILURE);
61	return; /* Not reached */
62	}
63
64	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_NO_SSLv2\|SSL_OP_NO_SSLv3\|SSL_OP_NO_TICKET);
65	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_DH_USE\|SSL_OP_CIPHER_SERVER_PREFERENCE);
66	SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.server_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE,
67	always_accept_verify_cb);
68	SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.server_ctx, SSL_SESS_CACHE_OFF);
69	SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");
70
71	#if OPENSSL_VERSION_NUMBER >= 0x009080FFL && !defined(OPENSSL_NO_ECDH)
72	{
73	EC_KEY *key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
74
75	if (key)
76	{
77	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
78	EC_KEY_free(key);
79	}
80	}
81
82	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_ECDH_USE);
83	#endif
84
85	if (!(ConfigServerInfo.tls_ctx.client_ctx = SSL_CTX_new(SSLv23_client_method())))
86	{
87	const char *s = ERR_lib_error_string(ERR_get_error());
88
89	fprintf(stderr, "ERROR: Could not initialize the SSL Client context -- %s\n", s);
90	ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the SSL Client context -- %s", s);
91	exit(EXIT_FAILURE);
92	return; /* Not reached */
93	}
94
95	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_NO_SSLv2\|SSL_OP_NO_SSLv3\|SSL_OP_NO_TICKET);
96	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_SINGLE_DH_USE);
97	SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.client_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE,
98	always_accept_verify_cb);
99	SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.client_ctx, SSL_SESS_CACHE_OFF);
100	}
101
102	int
103	tls_new_cred(void)
104	{
105	if (!ConfigServerInfo.ssl_certificate_file \|\| !ConfigServerInfo.rsa_private_key_file)
106	return 1;
107
108	if (SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_certificate_file) <= 0 \|\|
109	SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.ssl_certificate_file) <= 0)
110	{
111	report_crypto_errors();
112	return 0;
113	}
114
115	if (SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0 \|\|
116	SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0)
117	{
118	report_crypto_errors();
119	return 0;
120	}
121
122	if (!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.server_ctx) \|\|
123	!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.client_ctx))
124	{
125	report_crypto_errors();
126	return 0;
127	}
128
129	if (ConfigServerInfo.ssl_dh_param_file)
130	{
131	BIO *file = BIO_new_file(ConfigServerInfo.ssl_dh_param_file, "r");
132
133	if (file)
134	{
135	DH *dh = PEM_read_bio_DHparams(file, NULL, NULL, NULL);
136
137	BIO_free(file);
138
139	if (dh)
140	{
141	if (DH_size(dh) >= 256)
142	SSL_CTX_set_tmp_dh(ConfigServerInfo.tls_ctx.server_ctx, dh);
143	else
144	ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- need at least a 2048 bit DH prime size");
145
146	DH_free(dh);
147	}
148	}
149	else
150	ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- could not open/read Diffie-Hellman parameter file");
151	}
152
153	#if OPENSSL_VERSION_NUMBER >= 0x009080FFL && !defined(OPENSSL_NO_ECDH)
154	if (ConfigServerInfo.ssl_dh_elliptic_curve)
155	{
156	int nid = 0;
157	EC_KEY *key = NULL;
158
159	if ((nid = OBJ_sn2nid(ConfigServerInfo.ssl_dh_elliptic_curve)) == 0)
160	goto set_default_curve;
161
162	if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
163	goto set_default_curve;
164
165	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
166	EC_KEY_free(key);
167	}
168	else
169	{
170	EC_KEY *key;
171
172	set_default_curve:
173
174	key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
175
176	if (key)
177	{
178	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
179	EC_KEY_free(key);
180	}
181	}
182	#endif
183
184	if (ConfigServerInfo.ssl_message_digest_algorithm == NULL)
185	ConfigServerInfo.message_digest_algorithm = EVP_sha256();
186	else
187	{
188	ConfigServerInfo.message_digest_algorithm = EVP_get_digestbyname(ConfigServerInfo.ssl_message_digest_algorithm);
189
190	if (ConfigServerInfo.message_digest_algorithm == NULL)
191	{
192	ConfigServerInfo.message_digest_algorithm = EVP_sha256();
193	ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_message_digest_algorithm -- unknown message digest algorithm");
194	}
195	}
196
197	return 1;
198	}
199
200	const char *
201	tls_get_cipher(const tls_data_t *tls_data)
202	{
203	static char buffer[IRCD_BUFSIZE];
204	int bits = 0;
205	SSL ssl = tls_data;
206
207	SSL_CIPHER_get_bits(SSL_get_current_cipher(ssl), &bits);
208
209	snprintf(buffer, sizeof(buffer), "%s-%s-%d", SSL_get_version(ssl),
210	SSL_get_cipher(ssl), bits);
211	return buffer;
212	}
213
214	int
215	tls_isusing(tls_data_t *tls_data)
216	{
217	SSL ssl = tls_data;
218	return ssl != NULL;
219	}
220
221	void
222	tls_free(tls_data_t *tls_data)
223	{
224	SSL_free(*tls_data);
225	*tls_data = NULL;
226	}
227
228	int
229	tls_read(tls_data_t tls_data, char buf, size_t bufsize, int *want_write)
230	{
231	SSL ssl = tls_data;
232	int length = SSL_read(ssl, buf, bufsize);
233
234	/* Translate openssl error codes, sigh */
235	if (length < 0)
236	{
237	switch (SSL_get_error(ssl, length))
238	{
239	case SSL_ERROR_WANT_WRITE:
240	{
241	/* OpenSSL wants to write, we signal this to the caller and do nothing about that here */
242	*want_write = 1;
243	break;
244	}
245	case SSL_ERROR_WANT_READ:
246	errno = EWOULDBLOCK;
247	case SSL_ERROR_SYSCALL:
248	break;
249	case SSL_ERROR_SSL:
250	if (errno == EAGAIN)
251	break;
252	/* Fall through */
253	default:
254	length = errno = 0;
255	}
256	}
257
258	return length;
259	}
260
261	int
262	tls_write(tls_data_t tls_data, const char buf, size_t bufsize, int *want_read)
263	{
264	SSL ssl = tls_data;
265	int retlen = SSL_write(ssl, buf, bufsize);
266
267	/* Translate openssl error codes, sigh */
268	if (retlen < 0)
269	{
270	switch (SSL_get_error(ssl, retlen))
271	{
272	case SSL_ERROR_WANT_READ:
273	*want_read = 1;
274	break; /* Retry later, don't register for write events */
275	case SSL_ERROR_WANT_WRITE:
276	errno = EWOULDBLOCK;
277	break;
278	case SSL_ERROR_SYSCALL:
279	break;
280	case SSL_ERROR_SSL:
281	if (errno == EAGAIN)
282	break;
283	/* Fall through */
284	default:
285	retlen = errno = 0; /* Either an SSL-specific error or EOF */
286	}
287	}
288
289	return retlen;
290	}
291
292	void
293	tls_shutdown(tls_data_t *tls_data)
294	{
295	SSL ssl = tls_data;
296
297	SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
298
299	if (!SSL_shutdown(ssl))
300	SSL_shutdown(ssl);
301	}
302
303	int
304	tls_new(tls_data_t *tls_data, int fd, tls_role_t role)
305	{
306	SSL *ssl;
307
308	if (role == TLS_ROLE_SERVER)
309	ssl = SSL_new(ConfigServerInfo.tls_ctx.server_ctx);
310	else
311	ssl = SSL_new(ConfigServerInfo.tls_ctx.client_ctx);
312
313	if (!ssl)
314	{
315	ilog(LOG_TYPE_IRCD, "SSL_new() ERROR! -- %s",
316	ERR_error_string(ERR_get_error(), NULL));
317	return 0;
318	}
319
320	*tls_data = ssl;
321	SSL_set_fd(ssl, fd);
322	return 1;
323	}
324
325	int
326	tls_set_ciphers(tls_data_t tls_data, const char cipher_list)
327	{
328	SSL_set_cipher_list(*tls_data, cipher_list);
329	return 1;
330	}
331
332	tls_handshake_status_t
333	tls_handshake(tls_data_t tls_data, tls_role_t role, const char *errstr)
334	{
335	SSL ssl = tls_data;
336	int ret;
337
338	if (role == TLS_ROLE_SERVER)
339	ret = SSL_accept(ssl);
340	else
341	ret = SSL_connect(ssl);
342
343	if (ret > 0)
344	return TLS_HANDSHAKE_DONE;
345
346	switch (SSL_get_error(ssl, ret))
347	{
348	case SSL_ERROR_WANT_WRITE:
349	return TLS_HANDSHAKE_WANT_WRITE;
350	case SSL_ERROR_WANT_READ:
351	return TLS_HANDSHAKE_WANT_READ;
352	default:
353	{
354	const char *error = ERR_error_string(ERR_get_error(), NULL);
355
356	if (errstr)
357	*errstr = error;
358
359	return TLS_HANDSHAKE_ERROR;
360	}
361	}
362	}
363
364	int
365	tls_verify_cert(tls_data_t tls_data, tls_md_t digest, char *fingerprint)
366	{
367	SSL ssl = tls_data;
368	X509 *cert = SSL_get_peer_certificate(ssl);
369	unsigned int n;
370	char buf[EVP_MAX_MD_SIZE * 2 + 1];
371	unsigned char md[EVP_MAX_MD_SIZE];
372	int ret = 0;
373
374	/* Accept NULL return from SSL_get_peer_certificate */
375	if (!cert)
376	return 1;
377
378	int res = SSL_get_verify_result(ssl);
379	if (res == X509_V_OK \|\| res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN \|\|
380	res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE \|\|
381	res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
382	{
383	ret = 1;
384
385	if (X509_digest(cert, digest, md, &n))
386	{
387	binary_to_hex(md, buf, n);
388	*fingerprint = xstrdup(buf);
389	}
390	}
391
392	X509_free(cert);
393	return ret;
394	}
395	#endif /* HAVE_TLS_OPENSSL */