2 * libratbox: a library used by ircd-ratbox and other things
3 * gnutls.c: gnutls related code
5 * Copyright (C) 2007-2008 ircd-ratbox development team
6 * Copyright (C) 2007-2008 Aaron Sethman <androsyn@ratbox.org>
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.
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.
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
23 * $Id: gnutls.c 26296 2008-12-13 03:36:00Z androsyn $
26 #include <libratbox_config.h>
27 #include <ratbox_lib.h>
28 #include <commio-int.h>
29 #include <commio-ssl.h>
32 #include <gnutls/gnutls.h>
33 #include <gnutls/x509.h>
34 #include <gnutls/crypto.h>
36 #if GNUTLS_VERSION_MAJOR < 3
40 static gnutls_certificate_credentials x509
;
41 static gnutls_dh_params dh_params
;
42 static gnutls_priority_t default_priority
;
44 /* These are all used for getting GnuTLS to supply a client cert. */
46 static unsigned int x509_cert_count
;
47 static gnutls_x509_crt_t x509_cert
[MAX_CERTS
];
48 static gnutls_x509_privkey_t x509_key
;
49 #if GNUTLS_VERSION_MAJOR < 3
50 static int cert_callback(gnutls_session_t session
, const gnutls_datum_t
*req_ca_rdn
, int nreqs
,
51 const gnutls_pk_algorithm_t
*sign_algos
, int sign_algos_len
, gnutls_retr_st
*st
);
53 static int cert_callback(gnutls_session_t session
, const gnutls_datum_t
*req_ca_rdn
, int nreqs
,
54 const gnutls_pk_algorithm_t
*sign_algos
, int sign_algos_len
, gnutls_retr2_st
*st
);
57 #define SSL_P(x) *((gnutls_session_t *)F->ssl)
60 rb_ssl_shutdown(rb_fde_t
*F
)
63 if(F
== NULL
|| F
->ssl
== NULL
)
65 for(i
= 0; i
< 4; i
++)
67 if(gnutls_bye(SSL_P(F
), GNUTLS_SHUT_RDWR
) == GNUTLS_E_SUCCESS
)
70 gnutls_deinit(SSL_P(F
));
75 rb_ssl_handshake_count(rb_fde_t
*F
)
77 return F
->handshake_count
;
81 rb_ssl_clear_handshake_count(rb_fde_t
*F
)
83 F
->handshake_count
= 0;
87 rb_ssl_timeout(rb_fde_t
*F
, void *notused
)
89 lrb_assert(F
->accept
!= NULL
);
90 F
->accept
->callback(F
, RB_ERR_TIMEOUT
, NULL
, 0, F
->accept
->data
);
95 do_ssl_handshake(rb_fde_t
*F
, PF
* callback
, void *data
)
100 ret
= gnutls_handshake(SSL_P(F
));
103 if((ret
== GNUTLS_E_INTERRUPTED
&& rb_ignore_errno(errno
)) || ret
== GNUTLS_E_AGAIN
)
105 if(gnutls_record_get_direction(SSL_P(F
)) == 0)
106 flags
= RB_SELECT_READ
;
108 flags
= RB_SELECT_WRITE
;
109 rb_setselect(F
, flags
, callback
, data
);
115 return 1; /* handshake is finished..go about life */
119 rb_ssl_tryaccept(rb_fde_t
*F
, void *data
)
122 struct acceptdata
*ad
;
124 lrb_assert(F
->accept
!= NULL
);
126 ret
= do_ssl_handshake(F
, rb_ssl_tryaccept
, NULL
);
128 /* do_ssl_handshake does the rb_setselect */
134 rb_settimeout(F
, 0, NULL
, NULL
);
135 rb_setselect(F
, RB_SELECT_READ
| RB_SELECT_WRITE
, NULL
, NULL
);
138 ad
->callback(F
, RB_OK
, (struct sockaddr
*)&ad
->S
, ad
->addrlen
, ad
->data
);
140 ad
->callback(F
, RB_ERROR_SSL
, NULL
, 0, ad
->data
);
146 rb_ssl_start_accepted(rb_fde_t
*new_F
, ACCB
* cb
, void *data
, int timeout
)
148 gnutls_session_t
*ssl
;
149 new_F
->type
|= RB_FD_SSL
;
150 ssl
= new_F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
151 new_F
->accept
= rb_malloc(sizeof(struct acceptdata
));
153 new_F
->accept
->callback
= cb
;
154 new_F
->accept
->data
= data
;
155 rb_settimeout(new_F
, timeout
, rb_ssl_timeout
, NULL
);
157 new_F
->accept
->addrlen
= 0;
159 gnutls_init(ssl
, GNUTLS_SERVER
);
160 gnutls_set_default_priority(*ssl
);
161 gnutls_credentials_set(*ssl
, GNUTLS_CRD_CERTIFICATE
, x509
);
162 gnutls_dh_set_prime_bits(*ssl
, 1024);
163 gnutls_transport_set_ptr(*ssl
, (gnutls_transport_ptr_t
) (long int)new_F
->fd
);
164 gnutls_certificate_server_set_request(*ssl
, GNUTLS_CERT_REQUEST
);
165 gnutls_priority_set(SSL_P(F
), default_priority
);
167 if(do_ssl_handshake(new_F
, rb_ssl_tryaccept
, NULL
))
169 struct acceptdata
*ad
= new_F
->accept
;
170 new_F
->accept
= NULL
;
171 ad
->callback(new_F
, RB_OK
, (struct sockaddr
*)&ad
->S
, ad
->addrlen
, ad
->data
);
181 rb_ssl_accept_setup(rb_fde_t
*F
, rb_fde_t
*new_F
, struct sockaddr
*st
, int addrlen
)
183 new_F
->type
|= RB_FD_SSL
;
184 new_F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
185 new_F
->accept
= rb_malloc(sizeof(struct acceptdata
));
187 new_F
->accept
->callback
= F
->accept
->callback
;
188 new_F
->accept
->data
= F
->accept
->data
;
189 rb_settimeout(new_F
, 10, rb_ssl_timeout
, NULL
);
190 memcpy(&new_F
->accept
->S
, st
, addrlen
);
191 new_F
->accept
->addrlen
= addrlen
;
193 gnutls_init((gnutls_session_t
*) new_F
->ssl
, GNUTLS_SERVER
);
194 gnutls_set_default_priority(SSL_P(new_F
));
195 gnutls_credentials_set(SSL_P(new_F
), GNUTLS_CRD_CERTIFICATE
, x509
);
196 gnutls_dh_set_prime_bits(SSL_P(new_F
), 1024);
197 gnutls_transport_set_ptr(SSL_P(new_F
), (gnutls_transport_ptr_t
) (long int)rb_get_fd(new_F
));
198 gnutls_certificate_server_set_request(SSL_P(new_F
), GNUTLS_CERT_REQUEST
);
199 gnutls_priority_set(SSL_P(F
), default_priority
);
201 if(do_ssl_handshake(F
, rb_ssl_tryaccept
, NULL
))
203 struct acceptdata
*ad
= F
->accept
;
205 ad
->callback(F
, RB_OK
, (struct sockaddr
*)&ad
->S
, ad
->addrlen
, ad
->data
);
214 rb_ssl_read_or_write(int r_or_w
, rb_fde_t
*F
, void *rbuf
, const void *wbuf
, size_t count
)
217 gnutls_session_t
*ssl
= F
->ssl
;
220 ret
= gnutls_record_recv(*ssl
, rbuf
, count
);
222 ret
= gnutls_record_send(*ssl
, wbuf
, count
);
229 case GNUTLS_E_INTERRUPTED
:
230 if(rb_ignore_errno(errno
))
232 if(gnutls_record_get_direction(*ssl
) == 0)
233 return RB_RW_SSL_NEED_READ
;
235 return RB_RW_SSL_NEED_WRITE
;
241 return RB_RW_IO_ERROR
;
248 rb_ssl_read(rb_fde_t
*F
, void *buf
, size_t count
)
250 return rb_ssl_read_or_write(0, F
, buf
, NULL
, count
);
254 rb_ssl_write(rb_fde_t
*F
, const void *buf
, size_t count
)
256 return rb_ssl_read_or_write(1, F
, NULL
, buf
, count
);
260 rb_gcry_random_seed(void *unused
)
262 #if GNUTLS_VERSION_MAJOR < 3
263 gcry_fast_random_poll();
270 gnutls_global_init();
272 if(gnutls_certificate_allocate_credentials(&x509
) != GNUTLS_E_SUCCESS
)
274 rb_lib_log("rb_init_ssl: Unable to allocate SSL/TLS certificate credentials");
278 #if GNUTLS_VERSION_MAJOR < 3
279 gnutls_certificate_client_set_retrieve_function(x509
, cert_callback
);
281 gnutls_certificate_set_retrieve_function(x509
, cert_callback
);
284 rb_event_addish("rb_gcry_random_seed", rb_gcry_random_seed
, NULL
, 300);
288 /* We only have one certificate to authenticate with, as both client and server. Unfortunately,
289 * GnuTLS tries to be clever, and as client, will attempt to use a certificate that the server
290 * will trust. We usually use self-signed certs, though, so the result of this search is always
291 * nothing. Therefore, it uses no certificate to authenticate as a client. This is undesirable
292 * as it breaks fingerprint auth. Thus, we use this callback to force GnuTLS to always
293 * authenticate with our certificate at all times.
295 #if GNUTLS_VERSION_MAJOR < 3
297 cert_callback(gnutls_session_t session
, const gnutls_datum_t
*req_ca_rdn
, int nreqs
,
298 const gnutls_pk_algorithm_t
*sign_algos
, int sign_algos_len
, gnutls_retr_st
*st
)
301 cert_callback(gnutls_session_t session
, const gnutls_datum_t
*req_ca_rdn
, int nreqs
,
302 const gnutls_pk_algorithm_t
*sign_algos
, int sign_algos_len
, gnutls_retr2_st
*st
)
305 /* XXX - ugly hack. Tell GnuTLS to use the first (only) certificate we have for auth. */
306 st
->type
= GNUTLS_CRT_X509
;
307 st
->ncerts
= x509_cert_count
;
308 st
->cert
.x509
= x509_cert
;
309 st
->key
.x509
= x509_key
;
315 rb_free_datum_t(gnutls_datum_t
* d
)
321 static gnutls_datum_t
*
322 rb_load_file_into_datum_t(const char *file
)
325 gnutls_datum_t
*datum
;
326 struct stat fileinfo
;
327 if((f
= fopen(file
, "r")) == NULL
)
329 if(fstat(fileno(f
), &fileinfo
))
332 datum
= rb_malloc(sizeof(gnutls_datum_t
));
334 if(fileinfo
.st_size
> 131072) /* deal with retards */
335 datum
->size
= 131072;
337 datum
->size
= fileinfo
.st_size
;
339 datum
->data
= rb_malloc(datum
->size
+ 1);
340 fread(datum
->data
, datum
->size
, 1, f
);
346 rb_setup_ssl_server(const char *cert
, const char *keyfile
, const char *dhfile
, const char *cipher_list
)
350 gnutls_datum_t
*d_cert
, *d_key
;
353 rb_lib_log("rb_setup_ssl_server: No certificate file");
357 if((d_cert
= rb_load_file_into_datum_t(cert
)) == NULL
)
359 rb_lib_log("rb_setup_ssl_server: Error loading certificate: %s", strerror(errno
));
363 if((d_key
= rb_load_file_into_datum_t(keyfile
)) == NULL
)
365 rb_lib_log("rb_setup_ssl_server: Error loading key: %s", strerror(errno
));
369 /* In addition to creating the certificate set, we also need to store our cert elsewhere
370 * so we can force GnuTLS to identify with it when acting as a client.
372 gnutls_x509_privkey_init(&x509_key
);
373 if ((ret
= gnutls_x509_privkey_import(x509_key
, d_key
, GNUTLS_X509_FMT_PEM
)) != GNUTLS_E_SUCCESS
)
375 rb_lib_log("rb_setup_ssl_server: Error loading key file: %s", gnutls_strerror(ret
));
379 x509_cert_count
= MAX_CERTS
;
380 if ((ret
= gnutls_x509_crt_list_import(x509_cert
, &x509_cert_count
, d_cert
, GNUTLS_X509_FMT_PEM
,
381 GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED
)) < 0)
383 rb_lib_log("rb_setup_ssl_server: Error loading certificate: %s", gnutls_strerror(ret
));
386 x509_cert_count
= ret
;
389 gnutls_certificate_set_x509_key_mem(x509
, d_cert
, d_key
,
390 GNUTLS_X509_FMT_PEM
)) != GNUTLS_E_SUCCESS
)
392 rb_lib_log("rb_setup_ssl_server: Error loading certificate or key file: %s",
393 gnutls_strerror(ret
));
397 rb_free_datum_t(d_cert
);
398 rb_free_datum_t(d_key
);
402 if(gnutls_dh_params_init(&dh_params
) == GNUTLS_E_SUCCESS
)
404 gnutls_datum_t
*data
;
406 data
= rb_load_file_into_datum_t(dhfile
);
409 xret
= gnutls_dh_params_import_pkcs3(dh_params
, data
,
410 GNUTLS_X509_FMT_PEM
);
413 ("rb_setup_ssl_server: Error parsing DH file: %s\n",
414 gnutls_strerror(xret
));
415 rb_free_datum_t(data
);
417 gnutls_certificate_set_dh_params(x509
, dh_params
);
420 rb_lib_log("rb_setup_ssl_server: Unable to setup DH parameters");
423 ret
= gnutls_priority_init(&default_priority
, cipher_list
, &err
);
426 rb_lib_log("rb_setup_ssl_server: syntax error (using defaults instead) in ssl cipher list at: %s", err
);
427 gnutls_priority_init(&default_priority
, NULL
, &err
);
435 rb_ssl_listen(rb_fde_t
*F
, int backlog
, int defer_accept
)
439 result
= rb_listen(F
, backlog
, defer_accept
);
440 F
->type
= RB_FD_SOCKET
| RB_FD_LISTEN
| RB_FD_SSL
;
453 rb_ssl_connect_realcb(rb_fde_t
*F
, int status
, struct ssl_connect
*sconn
)
455 F
->connect
->callback
= sconn
->callback
;
456 F
->connect
->data
= sconn
->data
;
458 rb_connect_callback(F
, status
);
462 rb_ssl_tryconn_timeout_cb(rb_fde_t
*F
, void *data
)
464 rb_ssl_connect_realcb(F
, RB_ERR_TIMEOUT
, data
);
468 rb_ssl_tryconn_cb(rb_fde_t
*F
, void *data
)
470 struct ssl_connect
*sconn
= data
;
473 ret
= do_ssl_handshake(F
, rb_ssl_tryconn_cb
, (void *)sconn
);
478 rb_ssl_connect_realcb(F
, RB_ERROR_SSL
, sconn
);
481 /* do_ssl_handshake does the rb_setselect stuff */
488 rb_ssl_connect_realcb(F
, RB_OK
, sconn
);
492 rb_ssl_tryconn(rb_fde_t
*F
, int status
, void *data
)
494 struct ssl_connect
*sconn
= data
;
497 rb_ssl_connect_realcb(F
, status
, sconn
);
501 F
->type
|= RB_FD_SSL
;
504 rb_settimeout(F
, sconn
->timeout
, rb_ssl_tryconn_timeout_cb
, sconn
);
505 F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
506 gnutls_init(F
->ssl
, GNUTLS_CLIENT
);
507 gnutls_set_default_priority(SSL_P(F
));
508 gnutls_credentials_set(SSL_P(F
), GNUTLS_CRD_CERTIFICATE
, x509
);
509 gnutls_dh_set_prime_bits(SSL_P(F
), 1024);
510 gnutls_transport_set_ptr(SSL_P(F
), (gnutls_transport_ptr_t
) (long int)F
->fd
);
511 gnutls_priority_set(SSL_P(F
), default_priority
);
513 do_ssl_handshake(F
, rb_ssl_tryconn_cb
, (void *)sconn
);
517 rb_connect_tcp_ssl(rb_fde_t
*F
, struct sockaddr
*dest
,
518 struct sockaddr
*clocal
, int socklen
, CNCB
* callback
, void *data
, int timeout
)
520 struct ssl_connect
*sconn
;
524 sconn
= rb_malloc(sizeof(struct ssl_connect
));
526 sconn
->callback
= callback
;
527 sconn
->timeout
= timeout
;
528 rb_connect_tcp(F
, dest
, clocal
, socklen
, rb_ssl_tryconn
, sconn
, timeout
);
533 rb_ssl_start_connected(rb_fde_t
*F
, CNCB
* callback
, void *data
, int timeout
)
535 struct ssl_connect
*sconn
;
539 sconn
= rb_malloc(sizeof(struct ssl_connect
));
541 sconn
->callback
= callback
;
542 sconn
->timeout
= timeout
;
543 F
->connect
= rb_malloc(sizeof(struct conndata
));
544 F
->connect
->callback
= callback
;
545 F
->connect
->data
= data
;
546 F
->type
|= RB_FD_SSL
;
547 F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
549 gnutls_init(F
->ssl
, GNUTLS_CLIENT
);
550 gnutls_set_default_priority(SSL_P(F
));
551 gnutls_credentials_set(SSL_P(F
), GNUTLS_CRD_CERTIFICATE
, x509
);
552 gnutls_dh_set_prime_bits(SSL_P(F
), 1024);
553 gnutls_transport_set_ptr(SSL_P(F
), (gnutls_transport_ptr_t
) (long int)F
->fd
);
554 gnutls_priority_set(SSL_P(F
), default_priority
);
556 rb_settimeout(F
, sconn
->timeout
, rb_ssl_tryconn_timeout_cb
, sconn
);
558 do_ssl_handshake(F
, rb_ssl_tryconn_cb
, (void *)sconn
);
562 rb_init_prng(const char *path
, prng_seed_t seed_type
)
564 #if GNUTLS_VERSION_MAJOR < 3
565 gcry_fast_random_poll();
567 gnutls_rnd_refresh();
573 rb_get_random(void *buf
, size_t length
)
575 #if GNUTLS_VERSION_MAJOR < 3
576 gcry_randomize(buf
, length
, GCRY_STRONG_RANDOM
);
578 gnutls_rnd(GNUTLS_RND_KEY
, buf
, length
);
584 rb_get_ssl_strerror(rb_fde_t
*F
)
586 return gnutls_strerror(F
->ssl_errno
);
590 rb_get_ssl_certfp(rb_fde_t
*F
, uint8_t certfp
[RB_SSL_CERTFP_LEN
], int method
)
592 gnutls_x509_crt_t cert
;
593 gnutls_digest_algorithm_t algo
;
594 unsigned int cert_list_size
;
595 const gnutls_datum_t
*cert_list
;
596 uint8_t digest
[RB_SSL_CERTFP_LEN
* 2];
600 if (gnutls_certificate_type_get(SSL_P(F
)) != GNUTLS_CRT_X509
)
603 if (gnutls_x509_crt_init(&cert
) < 0)
607 cert_list
= gnutls_certificate_get_peers(SSL_P(F
), &cert_list_size
);
608 if (cert_list
== NULL
)
610 gnutls_x509_crt_deinit(cert
);
614 if (gnutls_x509_crt_import(cert
, &cert_list
[0], GNUTLS_X509_FMT_DER
) < 0)
616 gnutls_x509_crt_deinit(cert
);
622 case RB_SSL_CERTFP_METH_SHA1
:
623 algo
= GNUTLS_DIG_SHA1
;
624 len
= RB_SSL_CERTFP_LEN_SHA1
;
626 case RB_SSL_CERTFP_METH_SHA256
:
627 algo
= GNUTLS_DIG_SHA256
;
628 len
= RB_SSL_CERTFP_LEN_SHA256
;
630 case RB_SSL_CERTFP_METH_SHA512
:
631 algo
= GNUTLS_DIG_SHA512
;
632 len
= RB_SSL_CERTFP_LEN_SHA512
;
638 if (gnutls_x509_crt_get_fingerprint(cert
, algo
, digest
, &digest_size
) < 0)
640 gnutls_x509_crt_deinit(cert
);
644 memcpy(certfp
, digest
, len
);
646 gnutls_x509_crt_deinit(cert
);
651 rb_supports_ssl(void)
657 rb_get_ssl_info(char *buf
, size_t len
)
659 rb_snprintf(buf
, len
, "GNUTLS: compiled (%s), library(%s)",
660 LIBGNUTLS_VERSION
, gnutls_check_version(NULL
));
664 rb_ssl_get_cipher(rb_fde_t
*F
)
666 static char buf
[1024];
668 rb_snprintf(buf
, sizeof(buf
), "%s-%s-%s-%s",
669 gnutls_protocol_get_name(gnutls_protocol_get_version(SSL_P(F
))),
670 gnutls_kx_get_name(gnutls_kx_get(SSL_P(F
))),
671 gnutls_cipher_get_name(gnutls_cipher_get(SSL_P(F
))),
672 gnutls_mac_get_name(gnutls_mac_get(SSL_P(F
))));
677 #endif /* HAVE_GNUTLS */