trunk/src/tls_wolfssl.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) 2005-2020 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_wolfssl.c
 * \brief Includes all wolfSSL-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_WOLFSSL
#if LIBWOLFSSL_VERSION_HEX < 0x04003000
#error "wolfSSL 4.3.0 and above is required to build this module"
#endif

static bool TLS_initialized;

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

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

static int
always_accept_verify_cb(int preverify_ok, WOLFSSL_X509_STORE_CTX *x509_ctx)
{
  return 1;
}

bool
tls_is_initialized(void)
{
  return TLS_initialized;
}

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

  if ((ConfigServerInfo.tls_ctx.server_ctx = wolfSSL_CTX_new(wolfTLS_server_method())) == NULL)
  {
    ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS server context -- wolfSSL_CTX_new failed");
    exit(EXIT_FAILURE);
    return;  /* Not reached */
  }

  wolfSSL_CTX_SetMinVersion(ConfigServerInfo.tls_ctx.server_ctx, WOLFSSL_TLSV1_2);
  wolfSSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.server_ctx, SSL_SESS_CACHE_OFF);
  wolfSSL_CTX_set_verify(ConfigServerInfo.tls_ctx.server_ctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE, always_accept_verify_cb);
  wolfSSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");

  if ((ConfigServerInfo.tls_ctx.client_ctx = wolfSSL_CTX_new(wolfTLS_client_method())) == NULL)
  {
    ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS client context -- wolfSSL_CTX_new failed");
    exit(EXIT_FAILURE);
    return;  /* Not reached */
  }

  wolfSSL_CTX_SetMinVersion(ConfigServerInfo.tls_ctx.client_ctx, WOLFSSL_TLSV1_2);
  wolfSSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.client_ctx, SSL_SESS_CACHE_OFF);
  wolfSSL_CTX_set_verify(ConfigServerInfo.tls_ctx.client_ctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE, always_accept_verify_cb);
}

bool
tls_new_cred(void)
{
  TLS_initialized = false;

  if (ConfigServerInfo.tls_certificate_file == NULL || ConfigServerInfo.rsa_private_key_file == NULL)
    return true;

  if (wolfSSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.tls_certificate_file) != SSL_SUCCESS ||
      wolfSSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.tls_certificate_file) != SSL_SUCCESS)
  {
    report_crypto_errors();
    return false;
  }

  if (wolfSSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) != SSL_SUCCESS ||
      wolfSSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) != SSL_SUCCESS)
  {
    report_crypto_errors();
    return false;
  }

  if (wolfSSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.server_ctx) != SSL_SUCCESS ||
      wolfSSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.client_ctx) != SSL_SUCCESS)
  {
    report_crypto_errors();
    return false;
  }

  if (ConfigServerInfo.tls_dh_param_file)
    if (wolfSSL_CTX_SetTmpDH_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.tls_dh_param_file, SSL_FILETYPE_PEM) != SSL_SUCCESS)
       ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::tls_dh_param_file -- could not open/read Diffie-Hellman parameter file");

  if (ConfigServerInfo.tls_supported_groups == NULL)
    wolfSSL_CTX_set1_curves_list(ConfigServerInfo.tls_ctx.server_ctx, "X25519:P-256");
  else if (wolfSSL_CTX_set1_curves_list(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.tls_supported_groups) != SSL_SUCCESS)
  {
    wolfSSL_CTX_set1_curves_list(ConfigServerInfo.tls_ctx.server_ctx, "X25519:P-256");
    ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::tls_supported_groups -- could not set supported group(s)");
  }

  if (ConfigServerInfo.tls_message_digest_algorithm == NULL)
    ConfigServerInfo.message_digest_algorithm = wolfSSL_EVP_sha256();
  else if ((ConfigServerInfo.message_digest_algorithm = wolfSSL_EVP_get_digestbyname(ConfigServerInfo.tls_message_digest_algorithm)) == NULL)
  {
    ConfigServerInfo.message_digest_algorithm = wolfSSL_EVP_sha256();
    ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::tls_message_digest_algorithm -- unknown message digest algorithm");
  }

  if (ConfigServerInfo.tls_cipher_list == NULL)
    wolfSSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");
  else if (wolfSSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.tls_cipher_list) != SSL_SUCCESS)
  {
    wolfSSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");
    ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::tls_cipher_list -- could not set supported cipher(s)");
  }

  TLS_initialized = true;
  return true;
}

const char *
tls_get_cipher(const tls_data_t *tls_data)
{
  static char buf[128];
  WOLFSSL *ssl = *tls_data;

  snprintf(buf, sizeof(buf), "%s-%s", wolfSSL_get_version(ssl), wolfSSL_get_cipher(ssl));
  return buf;
}

const char *
tls_get_version(void)
{
  static char buf[256];

  snprintf(buf, sizeof(buf), "wolfSSL version: library: %s, header: %s",
           wolfSSL_lib_version(), LIBWOLFSSL_VERSION_STRING);
  return buf;
}

bool
tls_isusing(tls_data_t *tls_data)
{
  WOLFSSL *ssl = *tls_data;
  return ssl != NULL;
}

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

ssize_t
tls_read(tls_data_t *tls_data, char *buf, size_t bufsize, bool *want_write)
{
  WOLFSSL *ssl = *tls_data;
  ssize_t length = wolfSSL_read(ssl, buf, bufsize);

  /* Translate wolfSSL error codes, sigh */
  if (length < 0)
  {
    switch (wolfSSL_get_error(ssl, length))
    {
      case SSL_ERROR_WANT_WRITE:
      {
        /* wolfSSL wants to write, we signal this to the caller and do nothing about that here */
        *want_write = true;
        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;
}

ssize_t
tls_write(tls_data_t *tls_data, const char *buf, size_t bufsize, bool *want_read)
{
  WOLFSSL *ssl = *tls_data;
  ssize_t retlen = wolfSSL_write(ssl, buf, bufsize);

  /* Translate WolfSSL error codes, sigh */
  if (retlen < 0)
  {
    switch (wolfSSL_get_error(ssl, retlen))
    {
      case SSL_ERROR_WANT_READ:
        *want_read = true;
        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)
{
  WOLFSSL *ssl = *tls_data;
  int ret = wolfSSL_shutdown(ssl);

  if (ret == WOLFSSL_SHUTDOWN_NOT_DONE)
     wolfSSL_shutdown(ssl);
}

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

  if (TLS_initialized == false)
    return false;

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

  if (ssl == NULL)
  {
    ilog(LOG_TYPE_IRCD, "wolfSSL_new() ERROR! -- %s",
         wolfSSL_ERR_error_string(wolfSSL_ERR_get_error(), NULL));
    return false;
  }

  *tls_data = ssl;
  wolfSSL_set_fd(ssl, fd);
  return true;
}

bool
tls_set_ciphers(tls_data_t *tls_data, const char *cipher_list)
{
  wolfSSL_set_cipher_list(*tls_data, cipher_list);
  return true;
}

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

  if (role == TLS_ROLE_SERVER)
    ret = wolfSSL_accept(ssl);
  else
    ret = wolfSSL_connect(ssl);

  if (ret == WOLFSSL_SUCCESS)
    return TLS_HANDSHAKE_DONE;

  switch (wolfSSL_get_error(ssl, ret))
  {
    case WOLFSSL_ERROR_WANT_WRITE:
      return TLS_HANDSHAKE_WANT_WRITE;
    case WOLFSSL_ERROR_WANT_READ:
      return TLS_HANDSHAKE_WANT_READ;
    default:
    {
      const char *error = wolfSSL_ERR_error_string(wolfSSL_ERR_get_error(), NULL);

      if (errstr)
        *errstr = error;

      return TLS_HANDSHAKE_ERROR;
    }
  }
}

bool
tls_verify_cert(tls_data_t *tls_data, tls_md_t digest, char **fingerprint)
{
  WOLFSSL *ssl = *tls_data;
  unsigned int n;
  char buf[EVP_MAX_MD_SIZE * 2 + 1];
  unsigned char md[EVP_MAX_MD_SIZE];
  bool ret = false;

  /* Accept NULL return from SSL_get_peer_certificate */
  WOLFSSL_X509 *cert = wolfSSL_get_peer_certificate(ssl);
  if (cert == NULL)
    return true;

  switch (wolfSSL_get_verify_result(ssl))
  {
    case X509_V_OK:
    case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
    case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
    case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
      ret = true;

      if (wolfSSL_X509_digest(cert, digest, md, &n))
      {
        binary_to_hex(md, buf, n);
        *fingerprint = xstrdup(buf);
      }
    default:
      break;
  }

  wolfSSL_X509_free(cert);
  return ret;
}
#endif  /* HAVE_TLS_WOLFSSL */
Revision:	9202
Committed:	Fri Jan 24 23:52:04 2020 UTC (6 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	10543 byte(s)
Log Message:	- Stylistic changes
#	User	Rev	Content
1	michael	9166	/*
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) 2005-2020 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_wolfssl.c
25			* \brief Includes all wolfSSL-specific TLS functions
26	michael	9189	* \version $Id$
27	michael	9166	*/
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_WOLFSSL
37			#if LIBWOLFSSL_VERSION_HEX < 0x04003000
38			#error "wolfSSL 4.3.0 and above is required to build this module"
39			#endif
40
41			static bool TLS_initialized;
42
43			/*
44			* report_crypto_errors - Dump crypto error list to log
45			*/
46			static void
47			report_crypto_errors(void)
48			{
49			unsigned long e;
50
51			while ((e = wolfSSL_ERR_get_error()))
52			ilog(LOG_TYPE_IRCD, "SSL error: %s", wolfSSL_ERR_error_string(e, 0));
53			}
54
55			static int
56			always_accept_verify_cb(int preverify_ok, WOLFSSL_X509_STORE_CTX *x509_ctx)
57			{
58			return 1;
59			}
60
61			bool
62			tls_is_initialized(void)
63			{
64			return TLS_initialized;
65			}
66
67			/* tls_init()
68			*
69			* inputs - nothing
70			* output - nothing
71			* side effects - setups SSL context.
72			*/
73			void
74			tls_init(void)
75			{
76			wolfSSL_Init();
77
78			if ((ConfigServerInfo.tls_ctx.server_ctx = wolfSSL_CTX_new(wolfTLS_server_method())) == NULL)
79			{
80			ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS server context -- wolfSSL_CTX_new failed");
81			exit(EXIT_FAILURE);
82			return; /* Not reached */
83			}
84
85			wolfSSL_CTX_SetMinVersion(ConfigServerInfo.tls_ctx.server_ctx, WOLFSSL_TLSV1_2);
86			wolfSSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.server_ctx, SSL_SESS_CACHE_OFF);
87			wolfSSL_CTX_set_verify(ConfigServerInfo.tls_ctx.server_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE, always_accept_verify_cb);
88			wolfSSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");
89
90			if ((ConfigServerInfo.tls_ctx.client_ctx = wolfSSL_CTX_new(wolfTLS_client_method())) == NULL)
91			{
92			ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS client context -- wolfSSL_CTX_new failed");
93			exit(EXIT_FAILURE);
94			return; /* Not reached */
95			}
96
97			wolfSSL_CTX_SetMinVersion(ConfigServerInfo.tls_ctx.client_ctx, WOLFSSL_TLSV1_2);
98			wolfSSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.client_ctx, SSL_SESS_CACHE_OFF);
99			wolfSSL_CTX_set_verify(ConfigServerInfo.tls_ctx.client_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE, always_accept_verify_cb);
100			}
101
102			bool
103			tls_new_cred(void)
104			{
105			TLS_initialized = false;
106
107	michael	9202	if (ConfigServerInfo.tls_certificate_file == NULL \|\| ConfigServerInfo.rsa_private_key_file == NULL)
108	michael	9166	return true;
109
110			if (wolfSSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.tls_certificate_file) != SSL_SUCCESS \|\|
111			wolfSSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.tls_certificate_file) != SSL_SUCCESS)
112			{
113			report_crypto_errors();
114			return false;
115			}
116
117			if (wolfSSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) != SSL_SUCCESS \|\|
118			wolfSSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) != SSL_SUCCESS)
119			{
120			report_crypto_errors();
121			return false;
122			}
123
124			if (wolfSSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.server_ctx) != SSL_SUCCESS \|\|
125			wolfSSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.client_ctx) != SSL_SUCCESS)
126			{
127			report_crypto_errors();
128			return false;
129			}
130
131			if (ConfigServerInfo.tls_dh_param_file)
132	michael	9202	if (wolfSSL_CTX_SetTmpDH_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.tls_dh_param_file, SSL_FILETYPE_PEM) != SSL_SUCCESS)
133	michael	9166	ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::tls_dh_param_file -- could not open/read Diffie-Hellman parameter file");
134
135			if (ConfigServerInfo.tls_supported_groups == NULL)
136			wolfSSL_CTX_set1_curves_list(ConfigServerInfo.tls_ctx.server_ctx, "X25519:P-256");
137			else if (wolfSSL_CTX_set1_curves_list(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.tls_supported_groups) != SSL_SUCCESS)
138			{
139			wolfSSL_CTX_set1_curves_list(ConfigServerInfo.tls_ctx.server_ctx, "X25519:P-256");
140			ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::tls_supported_groups -- could not set supported group(s)");
141			}
142
143			if (ConfigServerInfo.tls_message_digest_algorithm == NULL)
144			ConfigServerInfo.message_digest_algorithm = wolfSSL_EVP_sha256();
145			else if ((ConfigServerInfo.message_digest_algorithm = wolfSSL_EVP_get_digestbyname(ConfigServerInfo.tls_message_digest_algorithm)) == NULL)
146			{
147			ConfigServerInfo.message_digest_algorithm = wolfSSL_EVP_sha256();
148			ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::tls_message_digest_algorithm -- unknown message digest algorithm");
149			}
150
151			if (ConfigServerInfo.tls_cipher_list == NULL)
152			wolfSSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");
153			else if (wolfSSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.tls_cipher_list) != SSL_SUCCESS)
154			{
155			wolfSSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");
156			ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::tls_cipher_list -- could not set supported cipher(s)");
157			}
158
159			TLS_initialized = true;
160			return true;
161			}
162
163			const char *
164			tls_get_cipher(const tls_data_t *tls_data)
165			{
166			static char buf[128];
167			WOLFSSL ssl = tls_data;
168
169			snprintf(buf, sizeof(buf), "%s-%s", wolfSSL_get_version(ssl), wolfSSL_get_cipher(ssl));
170			return buf;
171			}
172
173			const char *
174			tls_get_version(void)
175			{
176			static char buf[256];
177
178			snprintf(buf, sizeof(buf), "wolfSSL version: library: %s, header: %s",
179			wolfSSL_lib_version(), LIBWOLFSSL_VERSION_STRING);
180			return buf;
181			}
182
183			bool
184			tls_isusing(tls_data_t *tls_data)
185			{
186			WOLFSSL ssl = tls_data;
187			return ssl != NULL;
188			}
189
190			void
191			tls_free(tls_data_t *tls_data)
192			{
193			wolfSSL_free(*tls_data);
194			*tls_data = NULL;
195			}
196
197			ssize_t
198			tls_read(tls_data_t tls_data, char buf, size_t bufsize, bool *want_write)
199			{
200			WOLFSSL ssl = tls_data;
201			ssize_t length = wolfSSL_read(ssl, buf, bufsize);
202
203			/* Translate wolfSSL error codes, sigh */
204			if (length < 0)
205			{
206			switch (wolfSSL_get_error(ssl, length))
207			{
208			case SSL_ERROR_WANT_WRITE:
209			{
210			/* wolfSSL wants to write, we signal this to the caller and do nothing about that here */
211			*want_write = true;
212			break;
213			}
214			case SSL_ERROR_WANT_READ:
215			errno = EWOULDBLOCK;
216			case SSL_ERROR_SYSCALL:
217			break;
218			case SSL_ERROR_SSL:
219			if (errno == EAGAIN)
220			break;
221			/* Fall through */
222			default:
223			length = errno = 0;
224			}
225			}
226
227			return length;
228			}
229
230			ssize_t
231			tls_write(tls_data_t tls_data, const char buf, size_t bufsize, bool *want_read)
232			{
233			WOLFSSL ssl = tls_data;
234			ssize_t retlen = wolfSSL_write(ssl, buf, bufsize);
235
236			/* Translate WolfSSL error codes, sigh */
237			if (retlen < 0)
238			{
239			switch (wolfSSL_get_error(ssl, retlen))
240			{
241			case SSL_ERROR_WANT_READ:
242			*want_read = true;
243			break; /* Retry later, don't register for write events */
244			case SSL_ERROR_WANT_WRITE:
245			errno = EWOULDBLOCK;
246			break;
247			case SSL_ERROR_SYSCALL:
248			break;
249			case SSL_ERROR_SSL:
250			if (errno == EAGAIN)
251			break;
252			/* Fall through */
253			default:
254			retlen = errno = 0; /* Either an SSL-specific error or EOF */
255			}
256			}
257
258			return retlen;
259			}
260
261			void
262			tls_shutdown(tls_data_t *tls_data)
263			{
264			WOLFSSL ssl = tls_data;
265			int ret = wolfSSL_shutdown(ssl);
266
267			if (ret == WOLFSSL_SHUTDOWN_NOT_DONE)
268			wolfSSL_shutdown(ssl);
269			}
270
271			bool
272			tls_new(tls_data_t *tls_data, int fd, tls_role_t role)
273			{
274			WOLFSSL *ssl;
275
276			if (TLS_initialized == false)
277			return false;
278
279			if (role == TLS_ROLE_SERVER)
280			ssl = wolfSSL_new(ConfigServerInfo.tls_ctx.server_ctx);
281			else
282			ssl = wolfSSL_new(ConfigServerInfo.tls_ctx.client_ctx);
283
284			if (ssl == NULL)
285			{
286			ilog(LOG_TYPE_IRCD, "wolfSSL_new() ERROR! -- %s",
287			wolfSSL_ERR_error_string(wolfSSL_ERR_get_error(), NULL));
288			return false;
289			}
290
291			*tls_data = ssl;
292			wolfSSL_set_fd(ssl, fd);
293			return true;
294			}
295
296			bool
297			tls_set_ciphers(tls_data_t tls_data, const char cipher_list)
298			{
299			wolfSSL_set_cipher_list(*tls_data, cipher_list);
300			return true;
301			}
302
303			tls_handshake_status_t
304			tls_handshake(tls_data_t tls_data, tls_role_t role, const char *errstr)
305			{
306			WOLFSSL ssl = tls_data;
307			int ret;
308
309			if (role == TLS_ROLE_SERVER)
310			ret = wolfSSL_accept(ssl);
311			else
312			ret = wolfSSL_connect(ssl);
313
314			if (ret == WOLFSSL_SUCCESS)
315			return TLS_HANDSHAKE_DONE;
316
317			switch (wolfSSL_get_error(ssl, ret))
318			{
319			case WOLFSSL_ERROR_WANT_WRITE:
320			return TLS_HANDSHAKE_WANT_WRITE;
321			case WOLFSSL_ERROR_WANT_READ:
322			return TLS_HANDSHAKE_WANT_READ;
323			default:
324			{
325			const char *error = wolfSSL_ERR_error_string(wolfSSL_ERR_get_error(), NULL);
326
327			if (errstr)
328			*errstr = error;
329
330			return TLS_HANDSHAKE_ERROR;
331			}
332			}
333			}
334
335			bool
336			tls_verify_cert(tls_data_t tls_data, tls_md_t digest, char *fingerprint)
337			{
338			WOLFSSL ssl = tls_data;
339			unsigned int n;
340			char buf[EVP_MAX_MD_SIZE * 2 + 1];
341			unsigned char md[EVP_MAX_MD_SIZE];
342			bool ret = false;
343
344			/* Accept NULL return from SSL_get_peer_certificate */
345			WOLFSSL_X509 *cert = wolfSSL_get_peer_certificate(ssl);
346			if (cert == NULL)
347			return true;
348
349			switch (wolfSSL_get_verify_result(ssl))
350			{
351			case X509_V_OK:
352			case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
353			case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
354			case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
355			ret = true;
356
357			if (wolfSSL_X509_digest(cert, digest, md, &n))
358			{
359			binary_to_hex(md, buf, n);
360			*fingerprint = xstrdup(buf);
361			}
362			default:
363			break;
364			}
365
366			wolfSSL_X509_free(cert);
367			return ret;
368			}
369			#endif /* HAVE_TLS_WOLFSSL */