2 Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
3 Ben Kibbey <bjk@luxsci.net>
5 This file is part of pwmd.
7 Pwmd is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 2 of the License, or
10 (at your option) any later version.
12 Pwmd is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Pwmd. If not, see <http://www.gnu.org/licenses/>.
20 #include <gnutls/x509.h>
26 #include "pwmd-error.h"
28 #include "util-misc.h"
29 #include "util-string.h"
34 #define WAIT_INTERVAL 50000
35 #define TEST_TIMEOUT(timeout, ret, start, rc) \
37 if (ret == GNUTLS_E_AGAIN) \
39 time_t now = time (NULL); \
40 if (timeout && now - start >= timeout) \
42 rc = gpg_error (GPG_ERR_ETIMEDOUT); \
46 if (ret != GNUTLS_E_INTERRUPTED) \
48 struct timeval tv = { 0, WAIT_INTERVAL }; \
49 select (0, NULL, NULL, NULL, &tv); \
54 tls_fingerprint (gnutls_session_t ses
)
56 gnutls_x509_crt_t crt
;
57 const gnutls_datum_t
*cert_list
;
59 unsigned char buf
[20];
60 size_t len
= sizeof (buf
);
62 gnutls_x509_crt_init (&crt
);
65 log_write ("%s(%i): %s(): %s", __FILE__
, __LINE__
, __FUNCTION__
,
66 gnutls_strerror (GNUTLS_E_MEMORY_ERROR
));
70 cert_list
= gnutls_certificate_get_peers (ses
, &count
);
73 gnutls_x509_crt_import (crt
, &cert_list
[0], GNUTLS_X509_FMT_DER
);
74 gnutls_x509_crt_get_fingerprint (crt
, GNUTLS_DIG_SHA1
, buf
, &len
);
77 gnutls_x509_crt_deinit (crt
);
78 return bin2hex (buf
, len
);
82 verify_client_certificate (unsigned status
)
87 if (status
& GNUTLS_CERT_INVALID
)
88 log_write (_("client certificate is invalid"));
90 if (status
& GNUTLS_CERT_REVOKED
)
91 log_write (_("client certificate is revoked"));
93 if (status
& GNUTLS_CERT_SIGNER_NOT_FOUND
)
94 log_write (_("client certificate has no signer"));
96 if (status
& GNUTLS_CERT_SIGNER_NOT_CA
)
97 log_write (_("client certificate signer is not from CA"));
99 if (status
& GNUTLS_CERT_INSECURE_ALGORITHM
)
100 log_write (_("client certificate has insecure algorithm"));
102 return GNUTLS_E_CERTIFICATE_ERROR
;
106 tls_init (int fd
, int timeout
, const char *prio
)
108 struct tls_s
*tls
= xcalloc (1, sizeof (struct tls_s
));
111 const char *prio_error
;
112 gnutls_kx_algorithm_t kx
;
116 log_write ("%s(%i): %s: %s", __FILE__
, __LINE__
, __FUNCTION__
,
121 ret
= gnutls_init (&tls
->ses
, GNUTLS_SERVER
);
122 if (ret
!= GNUTLS_E_SUCCESS
)
125 ret
= gnutls_priority_set_direct (tls
->ses
, prio
, &prio_error
);
126 if (ret
!= GNUTLS_E_SUCCESS
)
129 ret
= gnutls_credentials_set (tls
->ses
, GNUTLS_CRD_CERTIFICATE
, x509_cred
);
130 if (ret
!= GNUTLS_E_SUCCESS
)
133 gnutls_certificate_server_set_request (tls
->ses
, GNUTLS_CERT_REQUIRE
);
134 gnutls_transport_set_ptr (tls
->ses
, (gnutls_transport_ptr_t
) fd
);
135 time_t start
= time (NULL
);
140 ret
= gnutls_handshake (tls
->ses
);
141 TEST_TIMEOUT (timeout
, ret
, start
, rc
);
145 while (ret
== GNUTLS_E_AGAIN
|| ret
== GNUTLS_E_INTERRUPTED
);
147 if (ret
!= GNUTLS_E_SUCCESS
)
150 ret
= gnutls_certificate_verify_peers2 (tls
->ses
, &status
);
154 kx
= gnutls_kx_get (tls
->ses
);
155 tls
->fp
= tls_fingerprint (tls
->ses
);
156 log_write ("PROTO=%s CIPHER=%s MAC=%s KX=%s(%d) FP=%s",
157 gnutls_protocol_get_name (gnutls_protocol_get_version
159 gnutls_cipher_get_name (gnutls_cipher_get (tls
->ses
)),
160 gnutls_mac_get_name (gnutls_mac_get (tls
->ses
)),
161 gnutls_kx_get_name (kx
), gnutls_dh_get_prime_bits (tls
->ses
),
162 tls
->fp
? tls
->fp
: "N/A");
163 ret
= verify_client_certificate (status
);
170 log_write ("%s", gnutls_strerror (ret
));
171 gnutls_deinit (tls
->ses
);
177 /* From the documentation. */
179 tls_get_params (gnutls_session_t ses
, gnutls_params_type_t type
,
180 gnutls_params_st
* st
)
182 if (type
== GNUTLS_PARAMS_RSA_EXPORT
)
183 st
->params
.rsa_export
= rsa_params
;
184 else if (type
== GNUTLS_PARAMS_DH
)
185 st
->params
.dh
= dh_params
;
195 tls_log (int level
, const char *msg
)
197 log_write ("TLS: %i: %s", level
, msg
);
201 tls_read_hook (assuan_context_t ctx
, assuan_fd_t fd
, void *data
, size_t len
)
203 struct client_s
*client
= assuan_get_pointer (ctx
);
204 time_t start
= time (NULL
);
212 ret
= gnutls_record_recv (client
->thd
->tls
->ses
, data
, len
);
213 if (ret
== GNUTLS_E_REHANDSHAKE
)
215 ret
= gnutls_rehandshake (client
->thd
->tls
->ses
);
216 if (ret
== GNUTLS_E_GOT_APPLICATION_DATA
)
218 else if (ret
!= GNUTLS_E_SUCCESS
)
220 log_write ("%s", gnutls_strerror (ret
));
227 ret
= gnutls_handshake (client
->thd
->tls
->ses
);
229 TEST_TIMEOUT (client
->thd
->timeout
, ret
, start
, rc
);
232 log_write ("%s", gnutls_strerror (ret
));
234 close (client
->thd
->fd
);
235 client
->thd
->fd
= -1;
239 while (ret
== GNUTLS_E_AGAIN
|| ret
== GNUTLS_E_INTERRUPTED
);
247 TEST_TIMEOUT (client
->thd
->timeout
, ret
, start
, rc
);
251 close (client
->thd
->fd
);
252 client
->thd
->fd
= -1;
256 while (ret
== GNUTLS_E_INTERRUPTED
|| ret
== GNUTLS_E_AGAIN
);
260 log_write ("%s", gnutls_strerror (ret
));
268 tls_write_hook (assuan_context_t ctx
, assuan_fd_t fd
, const void *data
,
271 struct client_s
*client
= assuan_get_pointer (ctx
);
273 time_t start
= time (NULL
);
279 ret
= gnutls_record_send (client
->thd
->tls
->ses
, data
, len
);
280 TEST_TIMEOUT (client
->thd
->timeout
, ret
, start
, rc
);
284 close (client
->thd
->fd
);
285 client
->thd
->fd
= -1;
289 while (ret
== GNUTLS_E_INTERRUPTED
|| ret
== GNUTLS_E_AGAIN
);
299 gpg_error_t rc
= GPG_ERR_UNKNOWN_ERRNO
;
301 n
= gnutls_certificate_allocate_credentials (&x509_cred
);
302 if (n
!= GNUTLS_E_SUCCESS
)
304 log_write ("%s", gnutls_strerror (n
));
309 tmp
= str_asprintf ("%s/ca-cert.pem", homedir
);
316 n
= gnutls_certificate_set_x509_trust_file (x509_cred
, tmp
,
317 GNUTLS_X509_FMT_PEM
);
320 log_write ("%s: %s", tmp
, gnutls_strerror (n
));
326 tmp
= str_asprintf ("%s/server-cert.pem", homedir
);
333 tmp2
= str_asprintf ("%s/server-key.pem", homedir
);
337 log_write ("%s(%i): %s", __FILE__
, __LINE__
, strerror (ENOMEM
));
341 n
= gnutls_certificate_set_x509_key_file (x509_cred
, tmp
, tmp2
,
342 GNUTLS_X509_FMT_PEM
);
345 if (n
!= GNUTLS_E_SUCCESS
)
347 log_write ("%s", gnutls_strerror (n
));
351 log_write ("%s", _("Generating key exchange parameters..."));
352 n
= gcry_control (GCRYCTL_ENABLE_QUICK_RANDOM
, 0);
355 log_write ("%s", pwmd_strerror (n
));
359 n
= gnutls_dh_params_init (&dh_params
);
360 if (n
!= GNUTLS_E_SUCCESS
)
362 log_write ("%s", gnutls_strerror (n
));
366 n
= gnutls_dh_params_generate2 (dh_params
, 1024);
367 if (n
!= GNUTLS_E_SUCCESS
)
369 log_write ("%s", gnutls_strerror (n
));
373 gnutls_certificate_set_dh_params (x509_cred
, dh_params
);
374 n
= gnutls_rsa_params_init (&rsa_params
);
375 if (n
!= GNUTLS_E_SUCCESS
)
377 log_write ("%s", gnutls_strerror (n
));
381 n
= gnutls_rsa_params_generate2 (rsa_params
, 512);
382 if (n
!= GNUTLS_E_SUCCESS
)
384 log_write ("%s", gnutls_strerror (n
));
388 gnutls_certificate_set_rsa_export_params (x509_cred
, rsa_params
);
389 gnutls_certificate_set_params_function (x509_cred
, tls_get_params
);
401 gnutls_dh_params_deinit (dh_params
);
407 gnutls_rsa_params_deinit (rsa_params
);
413 gnutls_certificate_free_credentials (x509_cred
);
419 do_tls_validate_access (struct client_s
*client
, const char *section
)
421 char **access
= config_get_list (section
, "tls_access");
423 int allow
= 0, deny
= 0;
425 if (!access
|| !*access
)
426 return GPG_ERR_INV_USER_ID
;
428 for (p
= access
; p
&& *p
; p
++)
433 if (*fp
&& *fp
== '+' && *(fp
+ 1) == 0)
447 if (!strcasecmp (client
->thd
->tls
->fp
, fp
))
462 return allow
&& !deny
? 0 : GPG_ERR_INV_USER_ID
;
466 tls_validate_access (struct client_s
*client
, const char *filename
)
468 gpg_error_t rc
= do_tls_validate_access (client
, "global");
471 rc
= do_tls_validate_access (client
, filename
);