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>
35 #if (GNUTLS_VERSION_MAJOR < 3)
38 # include <gnutls/crypto.h>
41 static gnutls_certificate_credentials_t x509
;
42 static gnutls_dh_params_t dh_params
;
43 static gnutls_priority_t default_priority
;
45 /* These are all used for getting GnuTLS to supply a client cert. */
47 static unsigned int x509_cert_count
;
48 static gnutls_x509_crt_t x509_cert
[MAX_CERTS
];
49 static gnutls_x509_privkey_t x509_key
;
50 #if GNUTLS_VERSION_MAJOR < 3
51 static int cert_callback(gnutls_session_t session
, const gnutls_datum_t
*req_ca_rdn
, int nreqs
,
52 const gnutls_pk_algorithm_t
*sign_algos
, int sign_algos_len
, gnutls_retr_st
*st
);
54 static int cert_callback(gnutls_session_t session
, const gnutls_datum_t
*req_ca_rdn
, int nreqs
,
55 const gnutls_pk_algorithm_t
*sign_algos
, int sign_algos_len
, gnutls_retr2_st
*st
);
58 #define SSL_P(x) *((gnutls_session_t *)F->ssl)
61 rb_ssl_shutdown(rb_fde_t
*F
)
64 if(F
== NULL
|| F
->ssl
== NULL
)
66 for(i
= 0; i
< 4; i
++)
68 if(gnutls_bye(SSL_P(F
), GNUTLS_SHUT_RDWR
) == GNUTLS_E_SUCCESS
)
71 gnutls_deinit(SSL_P(F
));
76 rb_ssl_handshake_count(rb_fde_t
*F
)
78 return F
->handshake_count
;
82 rb_ssl_clear_handshake_count(rb_fde_t
*F
)
84 F
->handshake_count
= 0;
88 rb_ssl_timeout(rb_fde_t
*F
, void *notused
)
90 lrb_assert(F
->accept
!= NULL
);
91 F
->accept
->callback(F
, RB_ERR_TIMEOUT
, NULL
, 0, F
->accept
->data
);
96 do_ssl_handshake(rb_fde_t
*F
, PF
* callback
, void *data
)
101 ret
= gnutls_handshake(SSL_P(F
));
104 if((ret
== GNUTLS_E_INTERRUPTED
&& rb_ignore_errno(errno
)) || ret
== GNUTLS_E_AGAIN
)
106 if(gnutls_record_get_direction(SSL_P(F
)) == 0)
107 flags
= RB_SELECT_READ
;
109 flags
= RB_SELECT_WRITE
;
110 rb_setselect(F
, flags
, callback
, data
);
116 return 1; /* handshake is finished..go about life */
120 rb_ssl_tryaccept(rb_fde_t
*F
, void *data
)
123 struct acceptdata
*ad
;
125 lrb_assert(F
->accept
!= NULL
);
127 ret
= do_ssl_handshake(F
, rb_ssl_tryaccept
, NULL
);
129 /* do_ssl_handshake does the rb_setselect */
135 rb_settimeout(F
, 0, NULL
, NULL
);
136 rb_setselect(F
, RB_SELECT_READ
| RB_SELECT_WRITE
, NULL
, NULL
);
139 ad
->callback(F
, RB_OK
, (struct sockaddr
*)&ad
->S
, ad
->addrlen
, ad
->data
);
141 ad
->callback(F
, RB_ERROR_SSL
, NULL
, 0, ad
->data
);
147 rb_ssl_start_accepted(rb_fde_t
*new_F
, ACCB
* cb
, void *data
, int timeout
)
149 gnutls_session_t
*ssl
;
150 new_F
->type
|= RB_FD_SSL
;
151 ssl
= new_F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
152 new_F
->accept
= rb_malloc(sizeof(struct acceptdata
));
154 new_F
->accept
->callback
= cb
;
155 new_F
->accept
->data
= data
;
156 rb_settimeout(new_F
, timeout
, rb_ssl_timeout
, NULL
);
158 new_F
->accept
->addrlen
= 0;
160 gnutls_init(ssl
, GNUTLS_SERVER
);
161 gnutls_set_default_priority(*ssl
);
162 gnutls_credentials_set(*ssl
, GNUTLS_CRD_CERTIFICATE
, x509
);
163 gnutls_dh_set_prime_bits(*ssl
, 1024);
164 gnutls_transport_set_ptr(*ssl
, (gnutls_transport_ptr_t
) (long int)new_F
->fd
);
165 gnutls_certificate_server_set_request(*ssl
, GNUTLS_CERT_REQUEST
);
166 gnutls_priority_set(*ssl
, default_priority
);
168 if(do_ssl_handshake(new_F
, rb_ssl_tryaccept
, NULL
))
170 struct acceptdata
*ad
= new_F
->accept
;
171 new_F
->accept
= NULL
;
172 ad
->callback(new_F
, RB_OK
, (struct sockaddr
*)&ad
->S
, ad
->addrlen
, ad
->data
);
182 rb_ssl_accept_setup(rb_fde_t
*F
, rb_fde_t
*new_F
, struct sockaddr
*st
, int addrlen
)
184 new_F
->type
|= RB_FD_SSL
;
185 new_F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
186 new_F
->accept
= rb_malloc(sizeof(struct acceptdata
));
188 new_F
->accept
->callback
= F
->accept
->callback
;
189 new_F
->accept
->data
= F
->accept
->data
;
190 rb_settimeout(new_F
, 10, rb_ssl_timeout
, NULL
);
191 memcpy(&new_F
->accept
->S
, st
, addrlen
);
192 new_F
->accept
->addrlen
= addrlen
;
194 gnutls_init((gnutls_session_t
*) new_F
->ssl
, GNUTLS_SERVER
);
195 gnutls_set_default_priority(SSL_P(new_F
));
196 gnutls_credentials_set(SSL_P(new_F
), GNUTLS_CRD_CERTIFICATE
, x509
);
197 gnutls_dh_set_prime_bits(SSL_P(new_F
), 1024);
198 gnutls_transport_set_ptr(SSL_P(new_F
), (gnutls_transport_ptr_t
) (long int)rb_get_fd(new_F
));
199 gnutls_certificate_server_set_request(SSL_P(new_F
), GNUTLS_CERT_REQUEST
);
200 gnutls_priority_set(SSL_P(F
), default_priority
);
202 if(do_ssl_handshake(F
, rb_ssl_tryaccept
, NULL
))
204 struct acceptdata
*ad
= F
->accept
;
206 ad
->callback(F
, RB_OK
, (struct sockaddr
*)&ad
->S
, ad
->addrlen
, ad
->data
);
215 rb_ssl_read_or_write(int r_or_w
, rb_fde_t
*F
, void *rbuf
, const void *wbuf
, size_t count
)
218 gnutls_session_t
*ssl
= F
->ssl
;
221 ret
= gnutls_record_recv(*ssl
, rbuf
, count
);
223 ret
= gnutls_record_send(*ssl
, wbuf
, count
);
230 case GNUTLS_E_INTERRUPTED
:
231 if(rb_ignore_errno(errno
))
233 if(gnutls_record_get_direction(*ssl
) == 0)
234 return RB_RW_SSL_NEED_READ
;
236 return RB_RW_SSL_NEED_WRITE
;
242 return RB_RW_IO_ERROR
;
249 rb_ssl_read(rb_fde_t
*F
, void *buf
, size_t count
)
251 return rb_ssl_read_or_write(0, F
, buf
, NULL
, count
);
255 rb_ssl_write(rb_fde_t
*F
, const void *buf
, size_t count
)
257 return rb_ssl_read_or_write(1, F
, NULL
, buf
, count
);
260 #if (GNUTLS_VERSION_MAJOR < 3)
262 rb_gcry_random_seed(void *unused
)
264 gcry_fast_random_poll();
271 gnutls_global_init();
273 if(gnutls_certificate_allocate_credentials(&x509
) != GNUTLS_E_SUCCESS
)
275 rb_lib_log("rb_init_ssl: Unable to allocate SSL/TLS certificate credentials");
279 #if GNUTLS_VERSION_MAJOR < 3
280 gnutls_certificate_client_set_retrieve_function(x509
, cert_callback
);
282 gnutls_certificate_set_retrieve_function(x509
, cert_callback
);
285 #if (GNUTLS_VERSION_MAJOR < 3)
286 rb_event_addish("rb_gcry_random_seed", rb_gcry_random_seed
, NULL
, 300);
292 /* We only have one certificate to authenticate with, as both client and server. Unfortunately,
293 * GnuTLS tries to be clever, and as client, will attempt to use a certificate that the server
294 * will trust. We usually use self-signed certs, though, so the result of this search is always
295 * nothing. Therefore, it uses no certificate to authenticate as a client. This is undesirable
296 * as it breaks fingerprint auth. Thus, we use this callback to force GnuTLS to always
297 * authenticate with our certificate at all times.
299 #if GNUTLS_VERSION_MAJOR < 3
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_retr_st
*st
)
305 cert_callback(gnutls_session_t session
, const gnutls_datum_t
*req_ca_rdn
, int nreqs
,
306 const gnutls_pk_algorithm_t
*sign_algos
, int sign_algos_len
, gnutls_retr2_st
*st
)
309 /* XXX - ugly hack. Tell GnuTLS to use the first (only) certificate we have for auth. */
310 #if (GNUTLS_VERSION_MAJOR < 3)
311 st
->type
= GNUTLS_CRT_X509
;
313 st
->cert_type
= GNUTLS_CRT_X509
;
314 st
->key_type
= GNUTLS_PRIVKEY_X509
;
316 st
->ncerts
= x509_cert_count
;
317 st
->cert
.x509
= x509_cert
;
318 st
->key
.x509
= x509_key
;
325 rb_free_datum_t(gnutls_datum_t
* d
)
331 static gnutls_datum_t
*
332 rb_load_file_into_datum_t(const char *file
)
335 gnutls_datum_t
*datum
;
336 struct stat fileinfo
;
337 if((f
= fopen(file
, "r")) == NULL
)
339 if(fstat(fileno(f
), &fileinfo
))
342 datum
= rb_malloc(sizeof(gnutls_datum_t
));
344 if(fileinfo
.st_size
> 131072) /* deal with retards */
345 datum
->size
= 131072;
347 datum
->size
= fileinfo
.st_size
;
349 datum
->data
= rb_malloc(datum
->size
+ 1);
350 fread(datum
->data
, datum
->size
, 1, f
);
356 rb_setup_ssl_server(const char *cert
, const char *keyfile
, const char *dhfile
, const char *cipher_list
)
360 gnutls_datum_t
*d_cert
, *d_key
;
363 rb_lib_log("rb_setup_ssl_server: No certificate file");
367 if((d_cert
= rb_load_file_into_datum_t(cert
)) == NULL
)
369 rb_lib_log("rb_setup_ssl_server: Error loading certificate: %s", strerror(errno
));
373 if((d_key
= rb_load_file_into_datum_t(keyfile
)) == NULL
)
375 rb_lib_log("rb_setup_ssl_server: Error loading key: %s", strerror(errno
));
379 /* In addition to creating the certificate set, we also need to store our cert elsewhere
380 * so we can force GnuTLS to identify with it when acting as a client.
382 gnutls_x509_privkey_init(&x509_key
);
383 if ((ret
= gnutls_x509_privkey_import(x509_key
, d_key
, GNUTLS_X509_FMT_PEM
)) != GNUTLS_E_SUCCESS
)
385 rb_lib_log("rb_setup_ssl_server: Error loading key file: %s", gnutls_strerror(ret
));
389 x509_cert_count
= MAX_CERTS
;
390 if ((ret
= gnutls_x509_crt_list_import(x509_cert
, &x509_cert_count
, d_cert
, GNUTLS_X509_FMT_PEM
,
391 GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED
)) < 0)
393 rb_lib_log("rb_setup_ssl_server: Error loading certificate: %s", gnutls_strerror(ret
));
396 x509_cert_count
= ret
;
399 gnutls_certificate_set_x509_key_mem(x509
, d_cert
, d_key
,
400 GNUTLS_X509_FMT_PEM
)) != GNUTLS_E_SUCCESS
)
402 rb_lib_log("rb_setup_ssl_server: Error loading certificate or key file: %s",
403 gnutls_strerror(ret
));
407 rb_free_datum_t(d_cert
);
408 rb_free_datum_t(d_key
);
412 if(gnutls_dh_params_init(&dh_params
) == GNUTLS_E_SUCCESS
)
414 gnutls_datum_t
*data
;
416 data
= rb_load_file_into_datum_t(dhfile
);
419 xret
= gnutls_dh_params_import_pkcs3(dh_params
, data
,
420 GNUTLS_X509_FMT_PEM
);
423 ("rb_setup_ssl_server: Error parsing DH file: %s\n",
424 gnutls_strerror(xret
));
425 rb_free_datum_t(data
);
427 gnutls_certificate_set_dh_params(x509
, dh_params
);
430 rb_lib_log("rb_setup_ssl_server: Unable to setup DH parameters");
433 ret
= gnutls_priority_init(&default_priority
, cipher_list
, &err
);
436 rb_lib_log("rb_setup_ssl_server: syntax error (using defaults instead) in ssl cipher list at: %s", err
);
437 gnutls_priority_init(&default_priority
, NULL
, &err
);
445 rb_ssl_listen(rb_fde_t
*F
, int backlog
, int defer_accept
)
449 result
= rb_listen(F
, backlog
, defer_accept
);
450 F
->type
= RB_FD_SOCKET
| RB_FD_LISTEN
| RB_FD_SSL
;
463 rb_ssl_connect_realcb(rb_fde_t
*F
, int status
, struct ssl_connect
*sconn
)
465 F
->connect
->callback
= sconn
->callback
;
466 F
->connect
->data
= sconn
->data
;
468 rb_connect_callback(F
, status
);
472 rb_ssl_tryconn_timeout_cb(rb_fde_t
*F
, void *data
)
474 rb_ssl_connect_realcb(F
, RB_ERR_TIMEOUT
, data
);
478 rb_ssl_tryconn_cb(rb_fde_t
*F
, void *data
)
480 struct ssl_connect
*sconn
= data
;
483 ret
= do_ssl_handshake(F
, rb_ssl_tryconn_cb
, (void *)sconn
);
488 rb_ssl_connect_realcb(F
, RB_ERROR_SSL
, sconn
);
491 /* do_ssl_handshake does the rb_setselect stuff */
498 rb_ssl_connect_realcb(F
, RB_OK
, sconn
);
502 rb_ssl_tryconn(rb_fde_t
*F
, int status
, void *data
)
504 struct ssl_connect
*sconn
= data
;
507 rb_ssl_connect_realcb(F
, status
, sconn
);
511 F
->type
|= RB_FD_SSL
;
514 rb_settimeout(F
, sconn
->timeout
, rb_ssl_tryconn_timeout_cb
, sconn
);
515 F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
516 gnutls_init(F
->ssl
, GNUTLS_CLIENT
);
517 gnutls_set_default_priority(SSL_P(F
));
518 gnutls_credentials_set(SSL_P(F
), GNUTLS_CRD_CERTIFICATE
, x509
);
519 gnutls_dh_set_prime_bits(SSL_P(F
), 1024);
520 gnutls_transport_set_ptr(SSL_P(F
), (gnutls_transport_ptr_t
) (long int)F
->fd
);
521 gnutls_priority_set(SSL_P(F
), default_priority
);
523 do_ssl_handshake(F
, rb_ssl_tryconn_cb
, (void *)sconn
);
527 rb_connect_tcp_ssl(rb_fde_t
*F
, struct sockaddr
*dest
,
528 struct sockaddr
*clocal
, int socklen
, CNCB
* callback
, void *data
, int timeout
)
530 struct ssl_connect
*sconn
;
534 sconn
= rb_malloc(sizeof(struct ssl_connect
));
536 sconn
->callback
= callback
;
537 sconn
->timeout
= timeout
;
538 rb_connect_tcp(F
, dest
, clocal
, socklen
, rb_ssl_tryconn
, sconn
, timeout
);
543 rb_ssl_start_connected(rb_fde_t
*F
, CNCB
* callback
, void *data
, int timeout
)
545 struct ssl_connect
*sconn
;
549 sconn
= rb_malloc(sizeof(struct ssl_connect
));
551 sconn
->callback
= callback
;
552 sconn
->timeout
= timeout
;
553 F
->connect
= rb_malloc(sizeof(struct conndata
));
554 F
->connect
->callback
= callback
;
555 F
->connect
->data
= data
;
556 F
->type
|= RB_FD_SSL
;
557 F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
559 gnutls_init(F
->ssl
, GNUTLS_CLIENT
);
560 gnutls_set_default_priority(SSL_P(F
));
561 gnutls_credentials_set(SSL_P(F
), GNUTLS_CRD_CERTIFICATE
, x509
);
562 gnutls_dh_set_prime_bits(SSL_P(F
), 1024);
563 gnutls_transport_set_ptr(SSL_P(F
), (gnutls_transport_ptr_t
) (long int)F
->fd
);
564 gnutls_priority_set(SSL_P(F
), default_priority
);
566 rb_settimeout(F
, sconn
->timeout
, rb_ssl_tryconn_timeout_cb
, sconn
);
568 do_ssl_handshake(F
, rb_ssl_tryconn_cb
, (void *)sconn
);
572 rb_init_prng(const char *path
, prng_seed_t seed_type
)
574 #if GNUTLS_VERSION_MAJOR < 3
575 gcry_fast_random_poll();
581 rb_get_random(void *buf
, size_t length
)
583 #if GNUTLS_VERSION_MAJOR < 3
584 gcry_randomize(buf
, length
, GCRY_STRONG_RANDOM
);
586 gnutls_rnd(GNUTLS_RND_KEY
, buf
, length
);
592 rb_get_ssl_strerror(rb_fde_t
*F
)
594 return gnutls_strerror(F
->ssl_errno
);
598 rb_get_ssl_certfp(rb_fde_t
*F
, uint8_t certfp
[RB_SSL_CERTFP_LEN
], int method
)
600 gnutls_x509_crt_t cert
;
601 gnutls_digest_algorithm_t algo
;
602 unsigned int cert_list_size
;
603 const gnutls_datum_t
*cert_list
;
604 uint8_t digest
[RB_SSL_CERTFP_LEN
* 2];
608 if (gnutls_certificate_type_get(SSL_P(F
)) != GNUTLS_CRT_X509
)
611 if (gnutls_x509_crt_init(&cert
) < 0)
615 cert_list
= gnutls_certificate_get_peers(SSL_P(F
), &cert_list_size
);
616 if (cert_list
== NULL
)
618 gnutls_x509_crt_deinit(cert
);
622 if (gnutls_x509_crt_import(cert
, &cert_list
[0], GNUTLS_X509_FMT_DER
) < 0)
624 gnutls_x509_crt_deinit(cert
);
630 case RB_SSL_CERTFP_METH_SHA1
:
631 algo
= GNUTLS_DIG_SHA1
;
632 len
= RB_SSL_CERTFP_LEN_SHA1
;
634 case RB_SSL_CERTFP_METH_SHA256
:
635 algo
= GNUTLS_DIG_SHA256
;
636 len
= RB_SSL_CERTFP_LEN_SHA256
;
638 case RB_SSL_CERTFP_METH_SHA512
:
639 algo
= GNUTLS_DIG_SHA512
;
640 len
= RB_SSL_CERTFP_LEN_SHA512
;
646 if (gnutls_x509_crt_get_fingerprint(cert
, algo
, digest
, &digest_size
) < 0)
648 gnutls_x509_crt_deinit(cert
);
652 memcpy(certfp
, digest
, len
);
654 gnutls_x509_crt_deinit(cert
);
659 rb_supports_ssl(void)
665 rb_get_ssl_info(char *buf
, size_t len
)
667 snprintf(buf
, len
, "GNUTLS: compiled (%s), library(%s)",
668 LIBGNUTLS_VERSION
, gnutls_check_version(NULL
));
672 rb_ssl_get_cipher(rb_fde_t
*F
)
674 static char buf
[1024];
676 snprintf(buf
, sizeof(buf
), "%s-%s-%s-%s",
677 gnutls_protocol_get_name(gnutls_protocol_get_version(SSL_P(F
))),
678 gnutls_kx_get_name(gnutls_kx_get(SSL_P(F
))),
679 gnutls_cipher_get_name(gnutls_cipher_get(SSL_P(F
))),
680 gnutls_mac_get_name(gnutls_mac_get(SSL_P(F
))));
685 #endif /* HAVE_GNUTLS */