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
;
43 /* These are all used for getting GnuTLS to supply a client cert. */
45 static unsigned int x509_cert_count
;
46 static gnutls_x509_crt_t x509_cert
[MAX_CERTS
];
47 static gnutls_x509_privkey_t x509_key
;
48 static int cert_callback(gnutls_session_t session
, const gnutls_datum_t
*req_ca_rdn
, int nreqs
,
49 const gnutls_pk_algorithm_t
*sign_algos
, int sign_algos_len
, gnutls_retr_st
*st
);
52 #define SSL_P(x) *((gnutls_session_t *)F->ssl)
55 rb_ssl_shutdown(rb_fde_t
*F
)
58 if(F
== NULL
|| F
->ssl
== NULL
)
60 for(i
= 0; i
< 4; i
++)
62 if(gnutls_bye(SSL_P(F
), GNUTLS_SHUT_RDWR
) == GNUTLS_E_SUCCESS
)
65 gnutls_deinit(SSL_P(F
));
70 rb_ssl_handshake_count(rb_fde_t
*F
)
72 return F
->handshake_count
;
76 rb_ssl_clear_handshake_count(rb_fde_t
*F
)
78 F
->handshake_count
= 0;
82 rb_ssl_timeout(rb_fde_t
*F
, void *notused
)
84 lrb_assert(F
->accept
!= NULL
);
85 F
->accept
->callback(F
, RB_ERR_TIMEOUT
, NULL
, 0, F
->accept
->data
);
90 do_ssl_handshake(rb_fde_t
*F
, PF
* callback
, void *data
)
95 ret
= gnutls_handshake(SSL_P(F
));
98 if((ret
== GNUTLS_E_INTERRUPTED
&& rb_ignore_errno(errno
)) || ret
== GNUTLS_E_AGAIN
)
100 if(gnutls_record_get_direction(SSL_P(F
)) == 0)
101 flags
= RB_SELECT_READ
;
103 flags
= RB_SELECT_WRITE
;
104 rb_setselect(F
, flags
, callback
, data
);
110 return 1; /* handshake is finished..go about life */
114 rb_ssl_tryaccept(rb_fde_t
*F
, void *data
)
117 struct acceptdata
*ad
;
119 lrb_assert(F
->accept
!= NULL
);
121 ret
= do_ssl_handshake(F
, rb_ssl_tryaccept
, NULL
);
123 /* do_ssl_handshake does the rb_setselect */
129 rb_settimeout(F
, 0, NULL
, NULL
);
130 rb_setselect(F
, RB_SELECT_READ
| RB_SELECT_WRITE
, NULL
, NULL
);
133 ad
->callback(F
, RB_OK
, (struct sockaddr
*)&ad
->S
, ad
->addrlen
, ad
->data
);
135 ad
->callback(F
, RB_ERROR_SSL
, NULL
, 0, ad
->data
);
141 rb_ssl_start_accepted(rb_fde_t
*new_F
, ACCB
* cb
, void *data
, int timeout
)
143 gnutls_session_t
*ssl
;
144 new_F
->type
|= RB_FD_SSL
;
145 ssl
= new_F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
146 new_F
->accept
= rb_malloc(sizeof(struct acceptdata
));
148 new_F
->accept
->callback
= cb
;
149 new_F
->accept
->data
= data
;
150 rb_settimeout(new_F
, timeout
, rb_ssl_timeout
, NULL
);
152 new_F
->accept
->addrlen
= 0;
154 gnutls_init(ssl
, GNUTLS_SERVER
);
155 gnutls_set_default_priority(*ssl
);
156 gnutls_credentials_set(*ssl
, GNUTLS_CRD_CERTIFICATE
, x509
);
157 gnutls_dh_set_prime_bits(*ssl
, 1024);
158 gnutls_transport_set_ptr(*ssl
, (gnutls_transport_ptr_t
) (long int)new_F
->fd
);
159 gnutls_certificate_server_set_request(*ssl
, GNUTLS_CERT_REQUEST
);
160 if(do_ssl_handshake(new_F
, rb_ssl_tryaccept
, NULL
))
162 struct acceptdata
*ad
= new_F
->accept
;
163 new_F
->accept
= NULL
;
164 ad
->callback(new_F
, RB_OK
, (struct sockaddr
*)&ad
->S
, ad
->addrlen
, ad
->data
);
174 rb_ssl_accept_setup(rb_fde_t
*F
, rb_fde_t
*new_F
, struct sockaddr
*st
, int addrlen
)
176 new_F
->type
|= RB_FD_SSL
;
177 new_F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
178 new_F
->accept
= rb_malloc(sizeof(struct acceptdata
));
180 new_F
->accept
->callback
= F
->accept
->callback
;
181 new_F
->accept
->data
= F
->accept
->data
;
182 rb_settimeout(new_F
, 10, rb_ssl_timeout
, NULL
);
183 memcpy(&new_F
->accept
->S
, st
, addrlen
);
184 new_F
->accept
->addrlen
= addrlen
;
186 gnutls_init((gnutls_session_t
*) new_F
->ssl
, GNUTLS_SERVER
);
187 gnutls_set_default_priority(SSL_P(new_F
));
188 gnutls_credentials_set(SSL_P(new_F
), GNUTLS_CRD_CERTIFICATE
, x509
);
189 gnutls_dh_set_prime_bits(SSL_P(new_F
), 1024);
190 gnutls_transport_set_ptr(SSL_P(new_F
), (gnutls_transport_ptr_t
) (long int)rb_get_fd(new_F
));
191 gnutls_certificate_server_set_request(SSL_P(new_F
), GNUTLS_CERT_REQUEST
);
192 if(do_ssl_handshake(F
, rb_ssl_tryaccept
, NULL
))
194 struct acceptdata
*ad
= F
->accept
;
196 ad
->callback(F
, RB_OK
, (struct sockaddr
*)&ad
->S
, ad
->addrlen
, ad
->data
);
205 rb_ssl_read_or_write(int r_or_w
, rb_fde_t
*F
, void *rbuf
, const void *wbuf
, size_t count
)
208 gnutls_session_t
*ssl
= F
->ssl
;
211 ret
= gnutls_record_recv(*ssl
, rbuf
, count
);
213 ret
= gnutls_record_send(*ssl
, wbuf
, count
);
220 case GNUTLS_E_INTERRUPTED
:
221 if(rb_ignore_errno(errno
))
223 if(gnutls_record_get_direction(*ssl
) == 0)
224 return RB_RW_SSL_NEED_READ
;
226 return RB_RW_SSL_NEED_WRITE
;
232 return RB_RW_IO_ERROR
;
239 rb_ssl_read(rb_fde_t
*F
, void *buf
, size_t count
)
241 return rb_ssl_read_or_write(0, F
, buf
, NULL
, count
);
245 rb_ssl_write(rb_fde_t
*F
, const void *buf
, size_t count
)
247 return rb_ssl_read_or_write(1, F
, NULL
, buf
, count
);
251 rb_gcry_random_seed(void *unused
)
253 #if GNUTLS_VERSION_MAJOR < 3
254 gcry_fast_random_poll();
261 gnutls_global_init();
263 if(gnutls_certificate_allocate_credentials(&x509
) != GNUTLS_E_SUCCESS
)
265 rb_lib_log("rb_init_ssl: Unable to allocate SSL/TLS certificate credentials");
269 /* This should be changed to gnutls_certificate_set_retrieve_function2 once
270 * everyone in the world has upgraded to GnuTLS 3.
272 gnutls_certificate_client_set_retrieve_function(x509
, cert_callback
);
274 rb_event_addish("rb_gcry_random_seed", rb_gcry_random_seed
, NULL
, 300);
278 /* We only have one certificate to authenticate with, as both client and server. Unfortunately,
279 * GnuTLS tries to be clever, and as client, will attempt to use a certificate that the server
280 * will trust. We usually use self-signed certs, though, so the result of this search is always
281 * nothing. Therefore, it uses no certificate to authenticate as a client. This is undesirable
282 * as it breaks fingerprint auth. Thus, we use this callback to force GnuTLS to always
283 * authenticate with our certificate at all times.
286 cert_callback(gnutls_session_t session
, const gnutls_datum_t
*req_ca_rdn
, int nreqs
,
287 const gnutls_pk_algorithm_t
*sign_algos
, int sign_algos_len
, gnutls_retr_st
*st
)
289 /* XXX - ugly hack. Tell GnuTLS to use the first (only) certificate we have for auth. */
290 st
->type
= GNUTLS_CRT_X509
;
291 st
->ncerts
= x509_cert_count
;
292 st
->cert
.x509
= x509_cert
;
293 st
->key
.x509
= x509_key
;
299 rb_free_datum_t(gnutls_datum_t
* d
)
305 static gnutls_datum_t
*
306 rb_load_file_into_datum_t(const char *file
)
309 gnutls_datum_t
*datum
;
310 struct stat fileinfo
;
311 if((f
= fopen(file
, "r")) == NULL
)
313 if(fstat(fileno(f
), &fileinfo
))
316 datum
= rb_malloc(sizeof(gnutls_datum_t
));
318 if(fileinfo
.st_size
> 131072) /* deal with retards */
319 datum
->size
= 131072;
321 datum
->size
= fileinfo
.st_size
;
323 datum
->data
= rb_malloc(datum
->size
+ 1);
324 fread(datum
->data
, datum
->size
, 1, f
);
330 rb_setup_ssl_server(const char *cert
, const char *keyfile
, const char *dhfile
)
333 gnutls_datum_t
*d_cert
, *d_key
;
336 rb_lib_log("rb_setup_ssl_server: No certificate file");
340 if((d_cert
= rb_load_file_into_datum_t(cert
)) == NULL
)
342 rb_lib_log("rb_setup_ssl_server: Error loading certificate: %s", strerror(errno
));
346 if((d_key
= rb_load_file_into_datum_t(keyfile
)) == NULL
)
348 rb_lib_log("rb_setup_ssl_server: Error loading key: %s", strerror(errno
));
352 /* In addition to creating the certificate set, we also need to store our cert elsewhere
353 * so we can force GnuTLS to identify with it when acting as a client.
355 gnutls_x509_privkey_init(&x509_key
);
356 if ((ret
= gnutls_x509_privkey_import(x509_key
, d_key
, GNUTLS_X509_FMT_PEM
)) != GNUTLS_E_SUCCESS
)
358 rb_lib_log("rb_setup_ssl_server: Error loading key file: %s", gnutls_strerror(ret
));
362 x509_cert_count
= MAX_CERTS
;
363 if ((ret
= gnutls_x509_crt_list_import(x509_cert
, &x509_cert_count
, d_cert
, GNUTLS_X509_FMT_PEM
,
364 GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED
)) < 0)
366 rb_lib_log("rb_setup_ssl_server: Error loading certificate: %s", gnutls_strerror(ret
));
369 x509_cert_count
= ret
;
372 gnutls_certificate_set_x509_key_mem(x509
, d_cert
, d_key
,
373 GNUTLS_X509_FMT_PEM
)) != GNUTLS_E_SUCCESS
)
375 rb_lib_log("rb_setup_ssl_server: Error loading certificate or key file: %s",
376 gnutls_strerror(ret
));
380 rb_free_datum_t(d_cert
);
381 rb_free_datum_t(d_key
);
385 if(gnutls_dh_params_init(&dh_params
) == GNUTLS_E_SUCCESS
)
387 gnutls_datum_t
*data
;
389 data
= rb_load_file_into_datum_t(dhfile
);
392 xret
= gnutls_dh_params_import_pkcs3(dh_params
, data
,
393 GNUTLS_X509_FMT_PEM
);
396 ("rb_setup_ssl_server: Error parsing DH file: %s\n",
397 gnutls_strerror(xret
));
398 rb_free_datum_t(data
);
400 gnutls_certificate_set_dh_params(x509
, dh_params
);
403 rb_lib_log("rb_setup_ssl_server: Unable to setup DH parameters");
409 rb_ssl_listen(rb_fde_t
*F
, int backlog
, int defer_accept
)
413 result
= rb_listen(F
->fd
, backlog
, defer_accept
);
414 F
->type
= RB_FD_SOCKET
| RB_FD_LISTEN
| RB_FD_SSL
;
427 rb_ssl_connect_realcb(rb_fde_t
*F
, int status
, struct ssl_connect
*sconn
)
429 F
->connect
->callback
= sconn
->callback
;
430 F
->connect
->data
= sconn
->data
;
432 rb_connect_callback(F
, status
);
436 rb_ssl_tryconn_timeout_cb(rb_fde_t
*F
, void *data
)
438 rb_ssl_connect_realcb(F
, RB_ERR_TIMEOUT
, data
);
442 rb_ssl_tryconn_cb(rb_fde_t
*F
, void *data
)
444 struct ssl_connect
*sconn
= data
;
447 ret
= do_ssl_handshake(F
, rb_ssl_tryconn_cb
, (void *)sconn
);
452 rb_ssl_connect_realcb(F
, RB_ERROR_SSL
, sconn
);
455 /* do_ssl_handshake does the rb_setselect stuff */
462 rb_ssl_connect_realcb(F
, RB_OK
, sconn
);
466 rb_ssl_tryconn(rb_fde_t
*F
, int status
, void *data
)
468 struct ssl_connect
*sconn
= data
;
471 rb_ssl_connect_realcb(F
, status
, sconn
);
475 F
->type
|= RB_FD_SSL
;
478 rb_settimeout(F
, sconn
->timeout
, rb_ssl_tryconn_timeout_cb
, sconn
);
479 F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
480 gnutls_init(F
->ssl
, GNUTLS_CLIENT
);
481 gnutls_set_default_priority(SSL_P(F
));
482 gnutls_credentials_set(SSL_P(F
), GNUTLS_CRD_CERTIFICATE
, x509
);
483 gnutls_dh_set_prime_bits(SSL_P(F
), 1024);
484 gnutls_transport_set_ptr(SSL_P(F
), (gnutls_transport_ptr_t
) (long int)F
->fd
);
486 do_ssl_handshake(F
, rb_ssl_tryconn_cb
, (void *)sconn
);
490 rb_connect_tcp_ssl(rb_fde_t
*F
, struct sockaddr
*dest
,
491 struct sockaddr
*clocal
, int socklen
, CNCB
* callback
, void *data
, int timeout
)
493 struct ssl_connect
*sconn
;
497 sconn
= rb_malloc(sizeof(struct ssl_connect
));
499 sconn
->callback
= callback
;
500 sconn
->timeout
= timeout
;
501 rb_connect_tcp(F
, dest
, clocal
, socklen
, rb_ssl_tryconn
, sconn
, timeout
);
506 rb_ssl_start_connected(rb_fde_t
*F
, CNCB
* callback
, void *data
, int timeout
)
508 struct ssl_connect
*sconn
;
512 sconn
= rb_malloc(sizeof(struct ssl_connect
));
514 sconn
->callback
= callback
;
515 sconn
->timeout
= timeout
;
516 F
->connect
= rb_malloc(sizeof(struct conndata
));
517 F
->connect
->callback
= callback
;
518 F
->connect
->data
= data
;
519 F
->type
|= RB_FD_SSL
;
520 F
->ssl
= rb_malloc(sizeof(gnutls_session_t
));
522 gnutls_init(F
->ssl
, GNUTLS_CLIENT
);
523 gnutls_set_default_priority(SSL_P(F
));
524 gnutls_credentials_set(SSL_P(F
), GNUTLS_CRD_CERTIFICATE
, x509
);
525 gnutls_dh_set_prime_bits(SSL_P(F
), 1024);
526 gnutls_transport_set_ptr(SSL_P(F
), (gnutls_transport_ptr_t
) (long int)F
->fd
);
528 rb_settimeout(F
, sconn
->timeout
, rb_ssl_tryconn_timeout_cb
, sconn
);
530 do_ssl_handshake(F
, rb_ssl_tryconn_cb
, (void *)sconn
);
534 rb_init_prng(const char *path
, prng_seed_t seed_type
)
536 #if GNUTLS_VERSION_MAJOR < 3
537 gcry_fast_random_poll();
543 rb_get_random(void *buf
, size_t length
)
545 #if GNUTLS_VERSION_MAJOR < 3
546 gcry_randomize(buf
, length
, GCRY_STRONG_RANDOM
);
548 gnutls_rnd(GNUTLS_RND_KEY
, buf
, length
);
554 rb_get_pseudo_random(void *buf
, size_t length
)
556 #if GNUTLS_VERSION_MAJOR < 3
557 gcry_randomize(buf
, length
, GCRY_WEAK_RANDOM
);
559 gnutls_rnd(GNUTLS_RND_RANDOM
, buf
, length
);
565 rb_get_ssl_strerror(rb_fde_t
*F
)
567 return gnutls_strerror(F
->ssl_errno
);
571 rb_get_ssl_certfp(rb_fde_t
*F
, uint8_t certfp
[RB_SSL_CERTFP_LEN
])
573 gnutls_x509_crt_t cert
;
574 unsigned int cert_list_size
;
575 const gnutls_datum_t
*cert_list
;
576 uint8_t digest
[RB_SSL_CERTFP_LEN
* 2];
579 if (gnutls_certificate_type_get(SSL_P(F
)) != GNUTLS_CRT_X509
)
582 if (gnutls_x509_crt_init(&cert
) < 0)
586 cert_list
= gnutls_certificate_get_peers(SSL_P(F
), &cert_list_size
);
587 if (cert_list
== NULL
)
589 gnutls_x509_crt_deinit(cert
);
593 if (gnutls_x509_crt_import(cert
, &cert_list
[0], GNUTLS_X509_FMT_DER
) < 0)
595 gnutls_x509_crt_deinit(cert
);
599 if (gnutls_x509_crt_get_fingerprint(cert
, GNUTLS_DIG_SHA1
, digest
, &digest_size
) < 0)
601 gnutls_x509_crt_deinit(cert
);
605 memcpy(certfp
, digest
, RB_SSL_CERTFP_LEN
);
607 gnutls_x509_crt_deinit(cert
);
612 rb_supports_ssl(void)
618 rb_get_ssl_info(char *buf
, size_t len
)
620 rb_snprintf(buf
, len
, "GNUTLS: compiled (%s), library(%s)",
621 LIBGNUTLS_VERSION
, gnutls_check_version(NULL
));
625 #endif /* HAVE_GNUTLS */