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

/*
 * 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;
}

/* 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)
{
  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);

  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:	7233
Committed:	Wed Feb 3 16:07:50 2016 UTC (9 years, 6 months ago) by michael
Content type:	text/x-csrc
File size:	10758 byte(s)
Log Message:	- tls_openssl.c: removed extraneous curly braces not needed with c99
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 2015 Attila Molnar <attilamolnar@hush.com>
5	* Copyright (c) 2015 Adam <Adam@anope.org>
6	* Copyright (c) 2005-2016 ircd-hybrid development team
7	*
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	#include "misc.h"
34	#include "memory.h"
35
36	#ifdef HAVE_TLS_OPENSSL
37
38	/*
39	* report_crypto_errors - Dump crypto error list to log
40	*/
41	static void
42	report_crypto_errors(void)
43	{
44	unsigned long e = 0;
45
46	while ((e = ERR_get_error()))
47	ilog(LOG_TYPE_IRCD, "SSL error: %s", ERR_error_string(e, 0));
48	}
49
50	static int
51	always_accept_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
52	{
53	return 1;
54	}
55
56	/* tls_init()
57	*
58	* inputs - nothing
59	* output - nothing
60	* side effects - setups SSL context.
61	*/
62	void
63	tls_init(void)
64	{
65	SSL_load_error_strings();
66	SSLeay_add_ssl_algorithms();
67
68	if (!(ConfigServerInfo.tls_ctx.server_ctx = SSL_CTX_new(SSLv23_server_method())))
69	{
70	const char *s = ERR_lib_error_string(ERR_get_error());
71
72	fprintf(stderr, "ERROR: Could not initialize the SSL Server context -- %s\n", s);
73	ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the SSL Server context -- %s", s);
74	exit(EXIT_FAILURE);
75	return; /* Not reached */
76	}
77
78	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_NO_SSLv2\|SSL_OP_NO_SSLv3\|SSL_OP_NO_TICKET);
79	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_DH_USE\|SSL_OP_CIPHER_SERVER_PREFERENCE);
80	SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.server_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE,
81	always_accept_verify_cb);
82	SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.server_ctx, SSL_SESS_CACHE_OFF);
83	SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");
84
85	#ifndef OPENSSL_NO_ECDH
86	EC_KEY *key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
87
88	if (key)
89	{
90	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
91	EC_KEY_free(key);
92	}
93
94	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_ECDH_USE);
95	#endif
96
97	if (!(ConfigServerInfo.tls_ctx.client_ctx = SSL_CTX_new(SSLv23_client_method())))
98	{
99	const char *s = ERR_lib_error_string(ERR_get_error());
100
101	fprintf(stderr, "ERROR: Could not initialize the SSL Client context -- %s\n", s);
102	ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the SSL Client context -- %s", s);
103	exit(EXIT_FAILURE);
104	return; /* Not reached */
105	}
106
107	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_NO_SSLv2\|SSL_OP_NO_SSLv3\|SSL_OP_NO_TICKET);
108	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_SINGLE_DH_USE);
109	SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.client_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE,
110	always_accept_verify_cb);
111	SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.client_ctx, SSL_SESS_CACHE_OFF);
112	}
113
114	int
115	tls_new_cred(void)
116	{
117	if (!ConfigServerInfo.ssl_certificate_file \|\| !ConfigServerInfo.rsa_private_key_file)
118	return 1;
119
120	if (SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_certificate_file) <= 0 \|\|
121	SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.ssl_certificate_file) <= 0)
122	{
123	report_crypto_errors();
124	return 0;
125	}
126
127	if (SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0 \|\|
128	SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0)
129	{
130	report_crypto_errors();
131	return 0;
132	}
133
134	if (!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.server_ctx) \|\|
135	!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.client_ctx))
136	{
137	report_crypto_errors();
138	return 0;
139	}
140
141	if (ConfigServerInfo.ssl_dh_param_file)
142	{
143	BIO *file = BIO_new_file(ConfigServerInfo.ssl_dh_param_file, "r");
144
145	if (file)
146	{
147	DH *dh = PEM_read_bio_DHparams(file, NULL, NULL, NULL);
148
149	BIO_free(file);
150
151	if (dh)
152	{
153	if (DH_size(dh) >= 256)
154	SSL_CTX_set_tmp_dh(ConfigServerInfo.tls_ctx.server_ctx, dh);
155	else
156	ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- need at least a 2048 bit DH prime size");
157
158	DH_free(dh);
159	}
160	}
161	else
162	ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- could not open/read Diffie-Hellman parameter file");
163	}
164
165	#ifndef OPENSSL_NO_ECDH
166	if (ConfigServerInfo.ssl_dh_elliptic_curve)
167	{
168	int nid = 0;
169	EC_KEY *key = NULL;
170
171	if ((nid = OBJ_sn2nid(ConfigServerInfo.ssl_dh_elliptic_curve)) == 0)
172	goto set_default_curve;
173
174	if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
175	goto set_default_curve;
176
177	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
178	EC_KEY_free(key);
179	}
180	else
181	{
182	EC_KEY *key;
183
184	set_default_curve:
185
186	key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
187
188	if (key)
189	{
190	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
191	EC_KEY_free(key);
192	}
193	}
194	#endif
195
196	if (ConfigServerInfo.ssl_message_digest_algorithm == NULL)
197	ConfigServerInfo.message_digest_algorithm = EVP_sha256();
198	else
199	{
200	ConfigServerInfo.message_digest_algorithm = EVP_get_digestbyname(ConfigServerInfo.ssl_message_digest_algorithm);
201
202	if (ConfigServerInfo.message_digest_algorithm == NULL)
203	{
204	ConfigServerInfo.message_digest_algorithm = EVP_sha256();
205	ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_message_digest_algorithm -- unknown message digest algorithm");
206	}
207	}
208
209	if (ConfigServerInfo.ssl_cipher_list)
210	SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_cipher_list);
211
212	return 1;
213	}
214
215	const char *
216	tls_get_cipher(const tls_data_t *tls_data)
217	{
218	static char buffer[IRCD_BUFSIZE];
219	int bits = 0;
220	SSL ssl = tls_data;
221
222	SSL_CIPHER_get_bits(SSL_get_current_cipher(ssl), &bits);
223
224	snprintf(buffer, sizeof(buffer), "%s-%s-%d", SSL_get_version(ssl),
225	SSL_get_cipher(ssl), bits);
226	return buffer;
227	}
228
229	int
230	tls_isusing(tls_data_t *tls_data)
231	{
232	SSL ssl = tls_data;
233	return ssl != NULL;
234	}
235
236	void
237	tls_free(tls_data_t *tls_data)
238	{
239	SSL_free(*tls_data);
240	*tls_data = NULL;
241	}
242
243	int
244	tls_read(tls_data_t tls_data, char buf, size_t bufsize, int *want_write)
245	{
246	SSL ssl = tls_data;
247	int length = SSL_read(ssl, buf, bufsize);
248
249	/* Translate openssl error codes, sigh */
250	if (length < 0)
251	{
252	switch (SSL_get_error(ssl, length))
253	{
254	case SSL_ERROR_WANT_WRITE:
255	{
256	/* OpenSSL wants to write, we signal this to the caller and do nothing about that here */
257	*want_write = 1;
258	break;
259	}
260	case SSL_ERROR_WANT_READ:
261	errno = EWOULDBLOCK;
262	case SSL_ERROR_SYSCALL:
263	break;
264	case SSL_ERROR_SSL:
265	if (errno == EAGAIN)
266	break;
267	/* Fall through */
268	default:
269	length = errno = 0;
270	}
271	}
272
273	return length;
274	}
275
276	int
277	tls_write(tls_data_t tls_data, const char buf, size_t bufsize, int *want_read)
278	{
279	SSL ssl = tls_data;
280	int retlen = SSL_write(ssl, buf, bufsize);
281
282	/* Translate openssl error codes, sigh */
283	if (retlen < 0)
284	{
285	switch (SSL_get_error(ssl, retlen))
286	{
287	case SSL_ERROR_WANT_READ:
288	*want_read = 1;
289	break; /* Retry later, don't register for write events */
290	case SSL_ERROR_WANT_WRITE:
291	errno = EWOULDBLOCK;
292	break;
293	case SSL_ERROR_SYSCALL:
294	break;
295	case SSL_ERROR_SSL:
296	if (errno == EAGAIN)
297	break;
298	/* Fall through */
299	default:
300	retlen = errno = 0; /* Either an SSL-specific error or EOF */
301	}
302	}
303
304	return retlen;
305	}
306
307	void
308	tls_shutdown(tls_data_t *tls_data)
309	{
310	SSL ssl = tls_data;
311
312	SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
313
314	if (!SSL_shutdown(ssl))
315	SSL_shutdown(ssl);
316	}
317
318	int
319	tls_new(tls_data_t *tls_data, int fd, tls_role_t role)
320	{
321	SSL *ssl;
322
323	if (role == TLS_ROLE_SERVER)
324	ssl = SSL_new(ConfigServerInfo.tls_ctx.server_ctx);
325	else
326	ssl = SSL_new(ConfigServerInfo.tls_ctx.client_ctx);
327
328	if (!ssl)
329	{
330	ilog(LOG_TYPE_IRCD, "SSL_new() ERROR! -- %s",
331	ERR_error_string(ERR_get_error(), NULL));
332	return 0;
333	}
334
335	*tls_data = ssl;
336	SSL_set_fd(ssl, fd);
337	return 1;
338	}
339
340	int
341	tls_set_ciphers(tls_data_t tls_data, const char cipher_list)
342	{
343	SSL_set_cipher_list(*tls_data, cipher_list);
344	return 1;
345	}
346
347	tls_handshake_status_t
348	tls_handshake(tls_data_t tls_data, tls_role_t role, const char *errstr)
349	{
350	SSL ssl = tls_data;
351	int ret;
352
353	if (role == TLS_ROLE_SERVER)
354	ret = SSL_accept(ssl);
355	else
356	ret = SSL_connect(ssl);
357
358	if (ret > 0)
359	return TLS_HANDSHAKE_DONE;
360
361	switch (SSL_get_error(ssl, ret))
362	{
363	case SSL_ERROR_WANT_WRITE:
364	return TLS_HANDSHAKE_WANT_WRITE;
365	case SSL_ERROR_WANT_READ:
366	return TLS_HANDSHAKE_WANT_READ;
367	default:
368	{
369	const char *error = ERR_error_string(ERR_get_error(), NULL);
370
371	if (errstr)
372	*errstr = error;
373
374	return TLS_HANDSHAKE_ERROR;
375	}
376	}
377	}
378
379	int
380	tls_verify_cert(tls_data_t tls_data, tls_md_t digest, char *fingerprint)
381	{
382	SSL ssl = tls_data;
383	X509 *cert = SSL_get_peer_certificate(ssl);
384	unsigned int n;
385	char buf[EVP_MAX_MD_SIZE * 2 + 1];
386	unsigned char md[EVP_MAX_MD_SIZE];
387	int ret = 0;
388
389	/* Accept NULL return from SSL_get_peer_certificate */
390	if (!cert)
391	return 1;
392
393	int res = SSL_get_verify_result(ssl);
394	if (res == X509_V_OK \|\| res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN \|\|
395	res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE \|\|
396	res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
397	{
398	ret = 1;
399
400	if (X509_digest(cert, digest, md, &n))
401	{
402	binary_to_hex(md, buf, n);
403	*fingerprint = xstrdup(buf);
404	}
405	}
406
407	X509_free(cert);
408	return ret;
409	}
410	#endif /* HAVE_TLS_OPENSSL */