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());

    ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS 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());

    ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS 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 (!TLS_initialized)
    return 0;

  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:	7278
Committed:	Sun Feb 7 15:28:26 2016 UTC (9 years, 6 months ago) by michael
Content type:	text/x-csrc
File size:	10761 byte(s)
Log Message:	- tls_openssl.c: removed logging to stderr which is closed at this point anyway
#	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	michael	7278	ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS Server context -- %s", s);
81	michael	7105	exit(EXIT_FAILURE);
82			return; /* Not reached */
83			}
84
85			SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_NO_SSLv2\|SSL_OP_NO_SSLv3\|SSL_OP_NO_TICKET);
86			SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_DH_USE\|SSL_OP_CIPHER_SERVER_PREFERENCE);
87			SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.server_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE,
88			always_accept_verify_cb);
89			SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.server_ctx, SSL_SESS_CACHE_OFF);
90			SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");
91
92	michael	7192	#ifndef OPENSSL_NO_ECDH
93	michael	7233	EC_KEY *key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
94
95			if (key)
96	michael	7105	{
97	michael	7233	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
98			EC_KEY_free(key);
99	michael	7105	}
100
101			SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_ECDH_USE);
102			#endif
103
104			if (!(ConfigServerInfo.tls_ctx.client_ctx = SSL_CTX_new(SSLv23_client_method())))
105			{
106			const char *s = ERR_lib_error_string(ERR_get_error());
107
108	michael	7278	ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS Client context -- %s", s);
109	michael	7105	exit(EXIT_FAILURE);
110			return; /* Not reached */
111			}
112
113			SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_NO_SSLv2\|SSL_OP_NO_SSLv3\|SSL_OP_NO_TICKET);
114			SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_SINGLE_DH_USE);
115			SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.client_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE,
116			always_accept_verify_cb);
117			SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.client_ctx, SSL_SESS_CACHE_OFF);
118			}
119
120			int
121			tls_new_cred(void)
122			{
123	michael	7271	TLS_initialized = 0;
124
125	michael	7105	if (!ConfigServerInfo.ssl_certificate_file \|\| !ConfigServerInfo.rsa_private_key_file)
126			return 1;
127
128			if (SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_certificate_file) <= 0 \|\|
129			SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.ssl_certificate_file) <= 0)
130			{
131			report_crypto_errors();
132			return 0;
133			}
134
135			if (SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0 \|\|
136			SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0)
137			{
138			report_crypto_errors();
139			return 0;
140			}
141
142			if (!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.server_ctx) \|\|
143			!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.client_ctx))
144			{
145			report_crypto_errors();
146			return 0;
147			}
148
149			if (ConfigServerInfo.ssl_dh_param_file)
150			{
151			BIO *file = BIO_new_file(ConfigServerInfo.ssl_dh_param_file, "r");
152
153			if (file)
154			{
155			DH *dh = PEM_read_bio_DHparams(file, NULL, NULL, NULL);
156
157			BIO_free(file);
158
159			if (dh)
160			{
161			if (DH_size(dh) >= 256)
162			SSL_CTX_set_tmp_dh(ConfigServerInfo.tls_ctx.server_ctx, dh);
163			else
164			ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- need at least a 2048 bit DH prime size");
165
166			DH_free(dh);
167			}
168			}
169			else
170			ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- could not open/read Diffie-Hellman parameter file");
171			}
172
173	michael	7192	#ifndef OPENSSL_NO_ECDH
174	michael	7124	if (ConfigServerInfo.ssl_dh_elliptic_curve)
175	michael	7105	{
176			int nid = 0;
177			EC_KEY *key = NULL;
178
179			if ((nid = OBJ_sn2nid(ConfigServerInfo.ssl_dh_elliptic_curve)) == 0)
180			goto set_default_curve;
181
182			if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
183			goto set_default_curve;
184
185			SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
186			EC_KEY_free(key);
187			}
188			else
189			{
190			EC_KEY *key;
191
192			set_default_curve:
193
194			key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
195
196			if (key)
197			{
198			SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
199			EC_KEY_free(key);
200			}
201			}
202			#endif
203
204			if (ConfigServerInfo.ssl_message_digest_algorithm == NULL)
205			ConfigServerInfo.message_digest_algorithm = EVP_sha256();
206			else
207			{
208			ConfigServerInfo.message_digest_algorithm = EVP_get_digestbyname(ConfigServerInfo.ssl_message_digest_algorithm);
209	michael	7124
210	michael	7105	if (ConfigServerInfo.message_digest_algorithm == NULL)
211			{
212			ConfigServerInfo.message_digest_algorithm = EVP_sha256();
213			ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_message_digest_algorithm -- unknown message digest algorithm");
214			}
215			}
216
217	michael	7190	if (ConfigServerInfo.ssl_cipher_list)
218			SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_cipher_list);
219
220	michael	7271	TLS_initialized = 1;
221	michael	7105	return 1;
222			}
223
224			const char *
225			tls_get_cipher(const tls_data_t *tls_data)
226			{
227			static char buffer[IRCD_BUFSIZE];
228			int bits = 0;
229			SSL ssl = tls_data;
230
231			SSL_CIPHER_get_bits(SSL_get_current_cipher(ssl), &bits);
232
233			snprintf(buffer, sizeof(buffer), "%s-%s-%d", SSL_get_version(ssl),
234			SSL_get_cipher(ssl), bits);
235			return buffer;
236			}
237
238			int
239			tls_isusing(tls_data_t *tls_data)
240			{
241			SSL ssl = tls_data;
242	michael	7124	return ssl != NULL;
243	michael	7105	}
244
245			void
246			tls_free(tls_data_t *tls_data)
247			{
248			SSL_free(*tls_data);
249			*tls_data = NULL;
250			}
251
252			int
253			tls_read(tls_data_t tls_data, char buf, size_t bufsize, int *want_write)
254			{
255			SSL ssl = tls_data;
256			int length = SSL_read(ssl, buf, bufsize);
257
258			/* Translate openssl error codes, sigh */
259			if (length < 0)
260			{
261			switch (SSL_get_error(ssl, length))
262			{
263			case SSL_ERROR_WANT_WRITE:
264			{
265			/* OpenSSL wants to write, we signal this to the caller and do nothing about that here */
266			*want_write = 1;
267			break;
268			}
269			case SSL_ERROR_WANT_READ:
270			errno = EWOULDBLOCK;
271			case SSL_ERROR_SYSCALL:
272			break;
273			case SSL_ERROR_SSL:
274			if (errno == EAGAIN)
275			break;
276			/* Fall through */
277			default:
278			length = errno = 0;
279			}
280			}
281
282			return length;
283			}
284
285			int
286			tls_write(tls_data_t tls_data, const char buf, size_t bufsize, int *want_read)
287			{
288			SSL ssl = tls_data;
289			int retlen = SSL_write(ssl, buf, bufsize);
290
291			/* Translate openssl error codes, sigh */
292			if (retlen < 0)
293			{
294			switch (SSL_get_error(ssl, retlen))
295			{
296			case SSL_ERROR_WANT_READ:
297			*want_read = 1;
298			break; /* Retry later, don't register for write events */
299			case SSL_ERROR_WANT_WRITE:
300			errno = EWOULDBLOCK;
301			break;
302			case SSL_ERROR_SYSCALL:
303			break;
304			case SSL_ERROR_SSL:
305			if (errno == EAGAIN)
306			break;
307			/* Fall through */
308			default:
309			retlen = errno = 0; /* Either an SSL-specific error or EOF */
310			}
311			}
312
313			return retlen;
314			}
315
316			void
317			tls_shutdown(tls_data_t *tls_data)
318			{
319			SSL ssl = tls_data;
320
321			SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
322
323			if (!SSL_shutdown(ssl))
324			SSL_shutdown(ssl);
325			}
326
327			int
328			tls_new(tls_data_t *tls_data, int fd, tls_role_t role)
329			{
330			SSL *ssl;
331
332	michael	7274	if (!TLS_initialized)
333			return 0;
334
335	michael	7105	if (role == TLS_ROLE_SERVER)
336			ssl = SSL_new(ConfigServerInfo.tls_ctx.server_ctx);
337			else
338			ssl = SSL_new(ConfigServerInfo.tls_ctx.client_ctx);
339
340			if (!ssl)
341			{
342			ilog(LOG_TYPE_IRCD, "SSL_new() ERROR! -- %s",
343			ERR_error_string(ERR_get_error(), NULL));
344			return 0;
345			}
346
347			*tls_data = ssl;
348			SSL_set_fd(ssl, fd);
349			return 1;
350			}
351
352			int
353			tls_set_ciphers(tls_data_t tls_data, const char cipher_list)
354			{
355			SSL_set_cipher_list(*tls_data, cipher_list);
356			return 1;
357			}
358
359			tls_handshake_status_t
360			tls_handshake(tls_data_t tls_data, tls_role_t role, const char *errstr)
361			{
362			SSL ssl = tls_data;
363			int ret;
364
365			if (role == TLS_ROLE_SERVER)
366			ret = SSL_accept(ssl);
367			else
368			ret = SSL_connect(ssl);
369
370			if (ret > 0)
371			return TLS_HANDSHAKE_DONE;
372
373			switch (SSL_get_error(ssl, ret))
374			{
375			case SSL_ERROR_WANT_WRITE:
376			return TLS_HANDSHAKE_WANT_WRITE;
377			case SSL_ERROR_WANT_READ:
378			return TLS_HANDSHAKE_WANT_READ;
379			default:
380			{
381			const char *error = ERR_error_string(ERR_get_error(), NULL);
382
383			if (errstr)
384			*errstr = error;
385
386			return TLS_HANDSHAKE_ERROR;
387			}
388			}
389			}
390
391			int
392	michael	7142	tls_verify_cert(tls_data_t tls_data, tls_md_t digest, char *fingerprint)
393	michael	7105	{
394			SSL ssl = tls_data;
395			X509 *cert = SSL_get_peer_certificate(ssl);
396			unsigned int n;
397			char buf[EVP_MAX_MD_SIZE * 2 + 1];
398			unsigned char md[EVP_MAX_MD_SIZE];
399			int ret = 0;
400
401			/* Accept NULL return from SSL_get_peer_certificate */
402			if (!cert)
403			return 1;
404
405			int res = SSL_get_verify_result(ssl);
406			if (res == X509_V_OK \|\| res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN \|\|
407			res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE \|\|
408			res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
409			{
410			ret = 1;
411
412			if (X509_digest(cert, digest, md, &n))
413			{
414			binary_to_hex(md, buf, n);
415			*fingerprint = xstrdup(buf);
416			}
417			}
418
419			X509_free(cert);
420			return ret;
421			}
422			#endif /* HAVE_TLS_OPENSSL */