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- Committer: teddy at recompile
- Date: 2011-12-27 12:15:06 UTC
- mto: (237.7.109 trunk) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@recompile.se-20111227121506-2qqqdy8evr9ts2ub
Add TODO entries about new D-Bus features we should use.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
/* $Id$ */
2
3
/* PLEASE NOTE *
4
* This file demonstrates how to use Avahi's core API, this is
5
* the embeddable mDNS stack for embedded applications.
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
6
4
*
7
* End user applications should *not* use this API and should use
8
* the D-Bus or C APIs, please see
9
* client-browse-services.c and glib-integration.c
10
*
11
* I repeat, you probably do *not* want to use this example.
5
* This program is partly derived from an example program for an Avahi
6
* service browser, downloaded from
7
* <http://avahi.org/browser/examples/core-browse-services.c>. This
8
* includes the following functions: "resolve_callback",
9
* "browse_callback", and parts of "main".
10
*
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
* General Public License for more details.
24
*
25
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
*
29
* Contact the authors at <mandos@recompile.se>.
12
30
*/
13
31
14
/***
15
This file is part of avahi.
16
17
avahi is free software; you can redistribute it and/or modify it
18
under the terms of the GNU Lesser General Public License as
19
published by the Free Software Foundation; either version 2.1 of the
20
License, or (at your option) any later version.
21
22
avahi is distributed in the hope that it will be useful, but WITHOUT
23
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
25
Public License for more details.
26
27
You should have received a copy of the GNU Lesser General Public
28
License along with avahi; if not, write to the Free Software
29
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
30
USA.
31
***/
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
35
36
#include <stdio.h>
37
#include <assert.h>
38
#include <stdlib.h>
39
#include <time.h>
40
#include <net/if.h> /* if_nametoindex */
41
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
SIOCSIFFLAGS, if_indextoname(),
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
79
#include <argp.h> /* struct argp_option, error_t, struct
80
argp_state, struct argp,
81
argp_parse(), ARGP_KEY_ARG,
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
92
#ifdef __linux__
93
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
95
96
/* Avahi */
97
/* All Avahi types, constants and functions
98
Avahi*, avahi_*,
99
AVAHI_* */
42
100
#include <avahi-core/core.h>
43
101
#include <avahi-core/lookup.h>
44
102
#include <avahi-core/log.h>
46
104
#include <avahi-common/malloc.h>
47
105
#include <avahi-common/error.h>
48
106
49
//mandos client part
50
#include <sys/types.h> /* socket(), setsockopt(), inet_pton() */
51
#include <sys/socket.h> /* socket(), setsockopt(), struct sockaddr_in6, struct in6_addr, inet_pton() */
52
#include <gnutls/gnutls.h> /* ALL GNUTLS STUFF */
53
#include <gnutls/openpgp.h> /* gnutls with openpgp stuff */
54
55
#include <unistd.h> /* close() */
56
#include <netinet/in.h>
57
#include <stdbool.h> /* true */
58
#include <string.h> /* memset */
59
#include <arpa/inet.h> /* inet_pton() */
60
#include <iso646.h> /* not */
61
62
// gpgme
63
#include <errno.h> /* perror() */
64
#include <gpgme.h>
65
66
67
#ifndef CERT_ROOT
68
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
69
#endif
70
#define CERTFILE CERT_ROOT "openpgp-client.txt"
71
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
107
/* GnuTLS */
108
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
109
functions:
110
gnutls_*
111
init_gnutls_session(),
112
GNUTLS_* */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
116
117
/* GPGME */
118
#include <gpgme.h> /* All GPGME types, constants and
119
functions:
120
gpgme_*
121
GPGME_PROTOCOL_OpenPGP,
122
GPG_ERR_NO_* */
123
72
124
#define BUFFER_SIZE 256
73
#define DH_BITS 1024
74
125
126
#define PATHDIR "/conf/conf.d/mandos"
127
#define SECKEY "seckey.txt"
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
131
bool debug = false;
132
static const char mandos_protocol_version[] = "1";
133
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
149
150
/* Used for passing in values through the Avahi callback functions */
75
151
typedef struct {
76
gnutls_session_t session;
152
AvahiSimplePoll *simple_poll;
153
AvahiServer *server;
77
154
gnutls_certificate_credentials_t cred;
155
unsigned int dh_bits;
78
156
gnutls_dh_params_t dh_params;
79
} encrypted_session;
80
81
82
ssize_t gpg_packet_decrypt (char *packet, size_t packet_size, char **new_packet, char *homedir){
83
gpgme_data_t dh_crypto, dh_plain;
157
const char *priority;
84
158
gpgme_ctx_t ctx;
159
server *current_server;
160
} mandos_context;
161
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
int e = errno;
174
fprintf(stderr, "Mandos plugin %s: ",
175
program_invocation_short_name);
176
errno = e;
177
perror(print_text);
178
}
179
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
190
/*
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
192
* bytes. "buffer_capacity" is how much is currently allocated,
193
* "buffer_length" is how much is already used.
194
*/
195
size_t incbuffer(char **buffer, size_t buffer_length,
196
size_t buffer_capacity){
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
200
return 0;
201
}
202
buffer_capacity += BUFFER_SIZE;
203
}
204
return buffer_capacity;
205
}
206
207
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
210
int ret;
211
server *new_server = malloc(sizeof(server));
212
if(new_server == NULL){
213
perror_plus("malloc");
214
return false;
215
}
216
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
220
if(new_server->ip == NULL){
221
perror_plus("strdup");
222
return false;
223
}
224
/* Special case of first server */
225
if (mc.current_server == NULL){
226
new_server->next = new_server;
227
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
230
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
233
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
240
}
241
return true;
242
}
243
244
/*
245
* Initialize GPGME.
246
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
85
249
gpgme_error_t rc;
86
ssize_t ret;
87
size_t new_packet_capacity = 0;
88
size_t new_packet_length = 0;
89
250
gpgme_engine_info_t engine_info;
90
251
252
253
/*
254
* Helper function to insert pub and seckey to the engine keyring.
255
*/
256
bool import_key(const char *filename){
257
int ret;
258
int fd;
259
gpgme_data_t pgp_data;
260
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
262
if(fd == -1){
263
perror_plus("open");
264
return false;
265
}
266
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
271
return false;
272
}
273
274
rc = gpgme_op_import(mc.ctx, pgp_data);
275
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
278
return false;
279
}
280
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
282
if(ret == -1){
283
perror_plus("close");
284
}
285
gpgme_data_release(pgp_data);
286
return true;
287
}
288
289
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
291
}
292
91
293
/* Init GPGME */
92
294
gpgme_check_version(NULL);
93
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
296
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
299
return false;
300
}
94
301
95
/* Set GPGME home directory */
96
rc = gpgme_get_engine_info (&engine_info);
97
if (rc != GPG_ERR_NO_ERROR){
98
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
99
gpgme_strsource(rc), gpgme_strerror(rc));
100
return -1;
302
/* Set GPGME home directory for the OpenPGP engine only */
303
rc = gpgme_get_engine_info(&engine_info);
304
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
307
return false;
101
308
}
102
309
while(engine_info != NULL){
103
310
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
104
311
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
105
engine_info->file_name, homedir);
312
engine_info->file_name, tempdir);
106
313
break;
107
314
}
108
315
engine_info = engine_info->next;
109
316
}
110
317
if(engine_info == NULL){
111
fprintf(stderr, "Could not set home dir to %s\n", homedir);
112
return -1;
113
}
114
115
/* Create new GPGME data buffer from packet buffer */
116
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
117
if (rc != GPG_ERR_NO_ERROR){
118
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
119
gpgme_strsource(rc), gpgme_strerror(rc));
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
320
return false;
321
}
322
323
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
325
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
329
return false;
330
}
331
332
if(not import_key(pubkey) or not import_key(seckey)){
333
return false;
334
}
335
336
return true;
337
}
338
339
/*
340
* Decrypt OpenPGP data.
341
* Returns -1 on error
342
*/
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
size_t crypto_size,
345
char **plaintext){
346
gpgme_data_t dh_crypto, dh_plain;
347
gpgme_error_t rc;
348
ssize_t ret;
349
size_t plaintext_capacity = 0;
350
ssize_t plaintext_length = 0;
351
352
if(debug){
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
354
}
355
356
/* Create new GPGME data buffer from memory cryptotext */
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
358
0);
359
if(rc != GPG_ERR_NO_ERROR){
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
120
362
return -1;
121
363
}
122
364
123
365
/* Create new empty GPGME data buffer for the plaintext */
124
366
rc = gpgme_data_new(&dh_plain);
125
if (rc != GPG_ERR_NO_ERROR){
126
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
127
gpgme_strsource(rc), gpgme_strerror(rc));
128
return -1;
129
}
130
131
/* Create new GPGME "context" */
132
rc = gpgme_new(&ctx);
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_new: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
136
return -1;
137
}
138
139
/* Decrypt data from the FILE pointer to the plaintext data buffer */
140
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
141
if (rc != GPG_ERR_NO_ERROR){
142
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
143
gpgme_strsource(rc), gpgme_strerror(rc));
144
return -1;
145
}
146
147
/* gpgme_decrypt_result_t result; */
148
/* result = gpgme_op_decrypt_result(ctx); */
149
/* fprintf(stderr, "Unsupported algorithm: %s\n", result->unsupported_algorithm); */
150
/* fprintf(stderr, "Wrong key usage: %d\n", result->wrong_key_usage); */
151
/* if(result->file_name != NULL){ */
152
/* fprintf(stderr, "File name: %s\n", result->file_name); */
153
/* } */
154
/* gpgme_recipient_t recipient; */
155
/* recipient = result->recipients; */
156
/* if(recipient){ */
157
/* while(recipient != NULL){ */
158
/* fprintf(stderr, "Public key algorithm: %s\n", */
159
/* gpgme_pubkey_algo_name(recipient->pubkey_algo)); */
160
/* fprintf(stderr, "Key ID: %s\n", recipient->keyid); */
161
/* fprintf(stderr, "Secret key available: %s\n", */
162
/* recipient->status == GPG_ERR_NO_SECKEY ? "No" : "Yes"); */
163
/* recipient = recipient->next; */
164
/* } */
165
/* } */
166
167
/* Delete the GPGME FILE pointer cryptotext data buffer */
168
gpgme_data_release(dh_crypto);
367
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
371
gpgme_data_release(dh_crypto);
372
return -1;
373
}
374
375
/* Decrypt data from the cryptotext data buffer to the plaintext
376
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
381
plaintext_length = -1;
382
if(debug){
383
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
385
if(result == NULL){
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
} else {
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
392
if(result->file_name != NULL){
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
}
395
gpgme_recipient_t recipient;
396
recipient = result->recipients;
397
while(recipient != NULL){
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
405
recipient = recipient->next;
406
}
407
}
408
}
409
goto decrypt_end;
410
}
411
412
if(debug){
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
414
}
169
415
170
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
171
gpgme_data_seek(dh_plain, 0, SEEK_SET);
172
173
*new_packet = 0;
417
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
418
perror_plus("gpgme_data_seek");
419
plaintext_length = -1;
420
goto decrypt_end;
421
}
422
423
*plaintext = NULL;
174
424
while(true){
175
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
176
*new_packet = realloc(*new_packet, new_packet_capacity + BUFFER_SIZE);
177
if (*new_packet == NULL){
178
perror("realloc");
179
return -1;
180
}
181
new_packet_capacity += BUFFER_SIZE;
425
plaintext_capacity = incbuffer(plaintext,
426
(size_t)plaintext_length,
427
plaintext_capacity);
428
if(plaintext_capacity == 0){
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
182
432
}
183
433
184
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length, BUFFER_SIZE);
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
435
BUFFER_SIZE);
185
436
/* Print the data, if any */
186
if (ret == 0){
187
/* If password is empty, then a incorrect error will be printed */
437
if(ret == 0){
438
/* EOF */
188
439
break;
189
440
}
190
441
if(ret < 0){
191
perror("gpgme_data_read");
192
return -1;
193
}
194
new_packet_length += ret;
195
}
196
197
/* Delete the GPGME plaintext data buffer */
442
perror_plus("gpgme_data_read");
443
plaintext_length = -1;
444
goto decrypt_end;
445
}
446
plaintext_length += ret;
447
}
448
449
if(debug){
450
fprintf_plus(stderr, "Decrypted password is: ");
451
for(ssize_t i = 0; i < plaintext_length; i++){
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
453
}
454
fprintf(stderr, "\n");
455
}
456
457
decrypt_end:
458
459
/* Delete the GPGME cryptotext data buffer */
460
gpgme_data_release(dh_crypto);
461
462
/* Delete the GPGME plaintext data buffer */
198
463
gpgme_data_release(dh_plain);
199
return new_packet_length;
464
return plaintext_length;
200
465
}
201
466
202
static const char * safer_gnutls_strerror (int value) {
203
const char *ret = gnutls_strerror (value);
204
if (ret == NULL)
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
205
471
ret = "(unknown)";
206
472
return ret;
207
473
}
208
474
209
void debuggnutls(int level, const char* string){
210
fprintf(stderr, "%s", string);
475
/* GnuTLS log function callback */
476
static void debuggnutls(__attribute__((unused)) int level,
477
const char* string){
478
fprintf_plus(stderr, "GnuTLS: %s", string);
211
479
}
212
480
213
int initgnutls(encrypted_session *es){
214
const char *err;
481
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
215
483
int ret;
216
484
217
if ((ret = gnutls_global_init ())
218
!= GNUTLS_E_SUCCESS) {
219
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
220
return -1;
221
}
222
223
/* Uncomment to enable full debuggin on the gnutls library */
224
/* gnutls_global_set_log_level(11); */
225
/* gnutls_global_set_log_function(debuggnutls); */
226
227
228
/* openpgp credentials */
229
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
230
!= GNUTLS_E_SUCCESS) {
231
fprintf (stderr, "memory error: %s\n", safer_gnutls_strerror(ret));
232
return -1;
233
}
234
485
if(debug){
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
487
}
488
489
ret = gnutls_global_init();
490
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
493
return -1;
494
}
495
496
if(debug){
497
/* "Use a log level over 10 to enable all debugging options."
498
* - GnuTLS manual
499
*/
500
gnutls_global_set_log_level(11);
501
gnutls_global_set_log_function(debuggnutls);
502
}
503
504
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
506
if(ret != GNUTLS_E_SUCCESS){
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
510
return -1;
511
}
512
513
if(debug){
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
518
}
519
235
520
ret = gnutls_certificate_set_openpgp_key_file
236
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
237
if (ret != GNUTLS_E_SUCCESS) {
238
fprintf
239
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s', '%s')\n",
240
ret, CERTFILE, KEYFILE);
241
fprintf(stdout, "The Error is: %s\n",
242
safer_gnutls_strerror(ret));
243
return -1;
244
}
245
246
//Gnutls server initialization
247
if ((ret = gnutls_dh_params_init (&es->dh_params))
248
!= GNUTLS_E_SUCCESS) {
249
fprintf (stderr, "Error in dh parameter initialization: %s\n",
250
safer_gnutls_strerror(ret));
251
return -1;
252
}
253
254
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
255
!= GNUTLS_E_SUCCESS) {
256
fprintf (stderr, "Error in prime generation: %s\n",
257
safer_gnutls_strerror(ret));
258
return -1;
259
}
260
261
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
262
263
// Gnutls session creation
264
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
265
!= GNUTLS_E_SUCCESS){
266
fprintf(stderr, "Error in gnutls session initialization: %s\n",
267
safer_gnutls_strerror(ret));
268
}
269
270
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
271
!= GNUTLS_E_SUCCESS) {
272
fprintf(stderr, "Syntax error at: %s\n", err);
273
fprintf(stderr, "Gnutls error: %s\n",
274
safer_gnutls_strerror(ret));
275
return -1;
276
}
277
278
if ((ret = gnutls_credentials_set
279
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
280
!= GNUTLS_E_SUCCESS) {
281
fprintf(stderr, "Error setting a credentials set: %s\n",
282
safer_gnutls_strerror(ret));
283
return -1;
284
}
285
521
(mc.cred, pubkeyfilename, seckeyfilename,
522
GNUTLS_OPENPGP_FMT_BASE64);
523
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
529
goto globalfail;
530
}
531
532
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
534
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
538
goto globalfail;
539
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
548
549
return 0;
550
551
globalfail:
552
553
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
556
return -1;
557
}
558
559
static int init_gnutls_session(gnutls_session_t *session){
560
int ret;
561
/* GnuTLS session creation */
562
do {
563
ret = gnutls_init(session, GNUTLS_SERVER);
564
if(quit_now){
565
return -1;
566
}
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
568
if(ret != GNUTLS_E_SUCCESS){
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
572
}
573
574
{
575
const char *err;
576
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
578
if(quit_now){
579
gnutls_deinit(*session);
580
return -1;
581
}
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
583
if(ret != GNUTLS_E_SUCCESS){
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
587
gnutls_deinit(*session);
588
return -1;
589
}
590
}
591
592
do {
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
595
if(quit_now){
596
gnutls_deinit(*session);
597
return -1;
598
}
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
600
if(ret != GNUTLS_E_SUCCESS){
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
603
gnutls_deinit(*session);
604
return -1;
605
}
606
286
607
/* ignore client certificate if any. */
287
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
288
609
289
gnutls_dh_set_prime_bits (es->session, DH_BITS);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
290
611
291
612
return 0;
292
613
}
293
614
294
void empty_log(AvahiLogLevel level, const char *txt){}
615
/* Avahi log function callback */
616
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
__attribute__((unused)) const char *txt){}
295
618
296
int start_mandos_communcation(char *ip, uint16_t port){
297
int ret, tcp_sd;
298
struct sockaddr_in6 to;
299
struct in6_addr ip_addr;
300
encrypted_session es;
619
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
621
AvahiIfIndex if_index,
622
int af){
623
int ret, tcp_sd = -1;
624
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
301
629
char *buffer = NULL;
302
char *decrypted_buffer;
630
char *decrypted_buffer = NULL;
303
631
size_t buffer_length = 0;
304
632
size_t buffer_capacity = 0;
305
ssize_t decrypted_buffer_size;
306
int retval = 0;
307
308
309
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
310
if(tcp_sd < 0) {
311
perror("socket");
312
return -1;
313
}
314
315
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, "eth0", 5);
316
if(tcp_sd < 0) {
317
perror("setsockopt bindtodevice");
318
return -1;
319
}
320
321
memset(&to,0,sizeof(to));
322
to.sin6_family = AF_INET6;
323
ret = inet_pton(AF_INET6, ip, &ip_addr);
324
if (ret < 0 ){
325
perror("inet_pton");
326
return -1;
327
}
633
size_t written;
634
int retval = -1;
635
gnutls_session_t session;
636
int pf; /* Protocol family */
637
638
errno = 0;
639
640
if(quit_now){
641
errno = EINTR;
642
return -1;
643
}
644
645
switch(af){
646
case AF_INET6:
647
pf = PF_INET6;
648
break;
649
case AF_INET:
650
pf = PF_INET;
651
break;
652
default:
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
654
errno = EINVAL;
655
return -1;
656
}
657
658
ret = init_gnutls_session(&session);
659
if(ret != 0){
660
return -1;
661
}
662
663
if(debug){
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
666
}
667
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
669
if(tcp_sd < 0){
670
int e = errno;
671
perror_plus("socket");
672
errno = e;
673
goto mandos_end;
674
}
675
676
if(quit_now){
677
errno = EINTR;
678
goto mandos_end;
679
}
680
681
memset(&to, 0, sizeof(to));
682
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
685
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
688
}
689
if(ret < 0 ){
690
int e = errno;
691
perror_plus("inet_pton");
692
errno = e;
693
goto mandos_end;
694
}
328
695
if(ret == 0){
329
fprintf(stderr, "Bad address: %s\n", ip);
330
return -1;
331
}
332
to.sin6_port = htons(port);
333
to.sin6_scope_id = if_nametoindex("eth0");
334
335
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
336
if (ret < 0){
337
perror("connect");
338
return -1;
339
}
340
341
ret = initgnutls (&es);
342
if (ret != 0){
343
retval = -1;
344
return -1;
345
}
346
347
348
gnutls_transport_set_ptr (es.session, (gnutls_transport_ptr_t) tcp_sd);
349
350
ret = gnutls_handshake (es.session);
351
352
if (ret != GNUTLS_E_SUCCESS){
353
fprintf(stderr, "\n*** Handshake failed ***\n");
354
gnutls_perror (ret);
355
retval = -1;
356
goto exit;
357
}
358
359
//retrive password
360
while(true){
361
if (buffer_length + BUFFER_SIZE > buffer_capacity){
362
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
363
if (buffer == NULL){
364
perror("realloc");
365
goto exit;
366
}
367
buffer_capacity += BUFFER_SIZE;
368
}
369
370
ret = gnutls_record_recv
371
(es.session, buffer+buffer_length, BUFFER_SIZE);
372
if (ret == 0){
696
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
698
errno = e;
699
goto mandos_end;
700
}
701
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
709
if(if_index == AVAHI_IF_UNSPEC){
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
712
errno = EINVAL;
713
goto mandos_end;
714
}
715
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
717
}
718
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
722
}
723
724
if(quit_now){
725
errno = EINTR;
726
goto mandos_end;
727
}
728
729
if(debug){
730
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
731
char interface[IF_NAMESIZE];
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
perror_plus("if_indextoname");
734
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
737
}
738
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
741
}
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
758
}
759
}
760
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
783
}
784
785
const char *out = mandos_protocol_version;
786
written = 0;
787
while(true){
788
size_t out_size = strlen(out);
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
791
if(ret == -1){
792
int e = errno;
793
perror_plus("write");
794
errno = e;
795
goto mandos_end;
796
}
797
written += (size_t)ret;
798
if(written < out_size){
799
continue;
800
} else {
801
if(out == mandos_protocol_version){
802
written = 0;
803
out = "\r\n";
804
} else {
805
break;
806
}
807
}
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
813
}
814
815
if(debug){
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
817
}
818
819
if(quit_now){
820
errno = EINTR;
821
goto mandos_end;
822
}
823
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
826
827
if(quit_now){
828
errno = EINTR;
829
goto mandos_end;
830
}
831
832
do {
833
ret = gnutls_handshake(session);
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
839
840
if(ret != GNUTLS_E_SUCCESS){
841
if(debug){
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
843
gnutls_perror(ret);
844
}
845
errno = EPROTO;
846
goto mandos_end;
847
}
848
849
/* Read OpenPGP packet that contains the wanted password */
850
851
if(debug){
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
854
}
855
856
while(true){
857
858
if(quit_now){
859
errno = EINTR;
860
goto mandos_end;
861
}
862
863
buffer_capacity = incbuffer(&buffer, buffer_length,
864
buffer_capacity);
865
if(buffer_capacity == 0){
866
int e = errno;
867
perror_plus("incbuffer");
868
errno = e;
869
goto mandos_end;
870
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
877
sret = gnutls_record_recv(session, buffer+buffer_length,
878
BUFFER_SIZE);
879
if(sret == 0){
373
880
break;
374
881
}
375
if (ret < 0){
376
switch(ret){
882
if(sret < 0){
883
switch(sret){
377
884
case GNUTLS_E_INTERRUPTED:
378
885
case GNUTLS_E_AGAIN:
379
886
break;
380
887
case GNUTLS_E_REHANDSHAKE:
381
ret = gnutls_handshake (es.session);
382
if (ret < 0){
383
fprintf(stderr, "\n*** Handshake failed ***\n");
384
gnutls_perror (ret);
385
retval = -1;
386
goto exit;
888
do {
889
ret = gnutls_handshake(session);
890
891
if(quit_now){
892
errno = EINTR;
893
goto mandos_end;
894
}
895
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
896
if(ret < 0){
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
899
gnutls_perror(ret);
900
errno = EPROTO;
901
goto mandos_end;
387
902
}
388
903
break;
389
904
default:
390
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
391
retval = -1;
392
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
393
goto exit;
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
907
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
errno = EIO;
909
goto mandos_end;
394
910
}
395
911
} else {
396
buffer_length += ret;
397
}
398
}
399
400
if (buffer_length > 0){
401
if ((decrypted_buffer_size = gpg_packet_decrypt(buffer, buffer_length, &decrypted_buffer, CERT_ROOT)) == 0){
912
buffer_length += (size_t) sret;
913
}
914
}
915
916
if(debug){
917
fprintf_plus(stderr, "Closing TLS session\n");
918
}
919
920
if(quit_now){
921
errno = EINTR;
922
goto mandos_end;
923
}
924
925
do {
926
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
931
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
932
933
if(buffer_length > 0){
934
ssize_t decrypted_buffer_size;
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
937
if(decrypted_buffer_size >= 0){
938
939
written = 0;
940
while(written < (size_t) decrypted_buffer_size){
941
if(quit_now){
942
errno = EINTR;
943
goto mandos_end;
944
}
945
946
ret = (int)fwrite(decrypted_buffer + written, 1,
947
(size_t)decrypted_buffer_size - written,
948
stdout);
949
if(ret == 0 and ferror(stdout)){
950
int e = errno;
951
if(debug){
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
954
}
955
errno = e;
956
goto mandos_end;
957
}
958
written += (size_t)ret;
959
}
960
retval = 0;
961
}
962
}
963
964
/* Shutdown procedure */
965
966
mandos_end:
967
{
968
int e = errno;
969
free(decrypted_buffer);
970
free(buffer);
971
if(tcp_sd >= 0){
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
973
}
974
if(ret == -1){
975
if(e == 0){
976
e = errno;
977
}
978
perror_plus("close");
979
}
980
gnutls_deinit(session);
981
errno = e;
982
if(quit_now){
983
errno = EINTR;
402
984
retval = -1;
403
} else {
404
fwrite (decrypted_buffer, 1, decrypted_buffer_size, stdout);
405
free(decrypted_buffer);
406
985
}
407
986
}
408
409
free(buffer);
410
411
//shutdown procedure
412
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
413
exit:
414
close(tcp_sd);
415
gnutls_deinit (es.session);
416
gnutls_certificate_free_credentials (es.cred);
417
gnutls_global_deinit ();
418
987
return retval;
419
988
}
420
989
421
static AvahiSimplePoll *simple_poll = NULL;
422
static AvahiServer *server = NULL;
423
424
static void resolve_callback(
425
AvahiSServiceResolver *r,
426
AVAHI_GCC_UNUSED AvahiIfIndex interface,
427
AVAHI_GCC_UNUSED AvahiProtocol protocol,
428
AvahiResolverEvent event,
429
const char *name,
430
const char *type,
431
const char *domain,
432
const char *host_name,
433
const AvahiAddress *address,
434
uint16_t port,
435
AvahiStringList *txt,
436
AvahiLookupResultFlags flags,
437
AVAHI_GCC_UNUSED void* userdata) {
438
439
assert(r);
440
441
/* Called whenever a service has been resolved successfully or timed out */
442
443
switch (event) {
444
case AVAHI_RESOLVER_FAILURE:
445
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain, avahi_strerror(avahi_server_errno(server)));
446
break;
447
448
case AVAHI_RESOLVER_FOUND: {
449
char ip[AVAHI_ADDRESS_STR_MAX];
450
avahi_address_snprint(ip, sizeof(ip), address);
451
int ret = start_mandos_communcation(ip, port);
452
if (ret == 0){
453
exit(EXIT_SUCCESS);
454
} else {
455
exit(EXIT_FAILURE);
456
}
457
}
458
}
459
avahi_s_service_resolver_free(r);
460
}
461
462
static void browse_callback(
463
AvahiSServiceBrowser *b,
464
AvahiIfIndex interface,
465
AvahiProtocol protocol,
466
AvahiBrowserEvent event,
467
const char *name,
468
const char *type,
469
const char *domain,
470
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
471
void* userdata) {
472
473
AvahiServer *s = userdata;
474
assert(b);
475
476
/* Called whenever a new services becomes available on the LAN or is removed from the LAN */
477
478
switch (event) {
479
480
case AVAHI_BROWSER_FAILURE:
481
482
fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server)));
483
avahi_simple_poll_quit(simple_poll);
484
return;
485
486
case AVAHI_BROWSER_NEW:
487
/* We ignore the returned resolver object. In the callback
488
function we free it. If the server is terminated before
489
the callback function is called the server will free
490
the resolver for us. */
491
492
if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_INET6, 0, resolve_callback, s)))
493
fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
494
495
break;
496
497
case AVAHI_BROWSER_REMOVE:
498
break;
499
500
case AVAHI_BROWSER_ALL_FOR_NOW:
501
case AVAHI_BROWSER_CACHE_EXHAUSTED:
502
break;
503
}
504
}
505
506
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
990
static void resolve_callback(AvahiSServiceResolver *r,
991
AvahiIfIndex interface,
992
AvahiProtocol proto,
993
AvahiResolverEvent event,
994
const char *name,
995
const char *type,
996
const char *domain,
997
const char *host_name,
998
const AvahiAddress *address,
999
uint16_t port,
1000
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1005
1006
/* Called whenever a service has been resolved successfully or
1007
timed out */
1008
1009
if(quit_now){
1010
return;
1011
}
1012
1013
switch(event){
1014
default:
1015
case AVAHI_RESOLVER_FAILURE:
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
break;
1021
1022
case AVAHI_RESOLVER_FOUND:
1023
{
1024
char ip[AVAHI_ADDRESS_STR_MAX];
1025
avahi_address_snprint(ip, sizeof(ip), address);
1026
if(debug){
1027
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
host_name, ip, (intmax_t)interface, port);
1030
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1033
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1035
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
1041
}
1042
}
1043
}
1044
avahi_s_service_resolver_free(r);
1045
}
1046
1047
static void browse_callback(AvahiSServiceBrowser *b,
1048
AvahiIfIndex interface,
1049
AvahiProtocol protocol,
1050
AvahiBrowserEvent event,
1051
const char *name,
1052
const char *type,
1053
const char *domain,
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1058
1059
/* Called whenever a new services becomes available on the LAN or
1060
is removed from the LAN */
1061
1062
if(quit_now){
1063
return;
1064
}
1065
1066
switch(event){
1067
default:
1068
case AVAHI_BROWSER_FAILURE:
1069
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1073
return;
1074
1075
case AVAHI_BROWSER_NEW:
1076
/* We ignore the returned Avahi resolver object. In the callback
1077
function we free it. If the Avahi server is terminated before
1078
the callback function is called the Avahi server will free the
1079
resolver for us. */
1080
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1087
break;
1088
1089
case AVAHI_BROWSER_REMOVE:
1090
break;
1091
1092
case AVAHI_BROWSER_ALL_FOR_NOW:
1093
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1094
if(debug){
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
1097
}
1098
break;
1099
}
1100
}
1101
1102
/* Signal handler that stops main loop after SIGTERM */
1103
static void handle_sigterm(int sig){
1104
if(quit_now){
1105
return;
1106
}
1107
quit_now = 1;
1108
signal_received = sig;
1109
int old_errno = errno;
1110
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1113
}
1114
errno = old_errno;
1115
}
1116
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int ret;
1119
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
if(s < 0){
1122
perror_plus("socket");
1123
return false;
1124
}
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
if(ret == -1){
1128
if(debug){
1129
perror_plus("ioctl SIOCGIFFLAGS");
1130
}
1131
return false;
1132
}
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1138
/* Reject the loopback device */
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1140
if(debug){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1143
}
1144
return false;
1145
}
1146
/* Accept point-to-point devices only if connect_to is specified */
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1148
if(debug){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1151
}
1152
return true;
1153
}
1154
/* Otherwise, reject non-broadcast-capable devices */
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1156
if(debug){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1159
}
1160
return false;
1161
}
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1164
if(debug){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1167
}
1168
return false;
1169
}
1170
1171
/* Accept this device */
1172
if(debug){
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1174
}
1175
return true;
1176
}
1177
1178
/*
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1182
*/
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1185
return 0;
1186
}
1187
1188
struct ifreq ifr;
1189
if(not get_flags(if_entry->d_name, &ifr)){
1190
if(debug){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1193
}
1194
return 0;
1195
}
1196
1197
if(not good_flags(if_entry->d_name, &ifr)){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1246
int notdotentries(const struct dirent *direntry){
1247
/* Skip "." and ".." */
1248
if(direntry->d_name[0] == '.'
1249
and (direntry->d_name[1] == '\0'
1250
or (direntry->d_name[1] == '.'
1251
and direntry->d_name[2] == '\0'))){
1252
return 0;
1253
}
1254
return 1;
1255
}
1256
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1259
int ret;
1260
size_t sret;
1261
struct stat st;
1262
1263
if((direntry->d_name)[0] == '\0'){
1264
/* Empty name? */
1265
return 0;
1266
}
1267
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1270
"0123456789"
1271
"_-");
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1274
if(debug){
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1276
direntry->d_name);
1277
}
1278
return 0;
1279
}
1280
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1289
if(ret == -1){
1290
if(debug){
1291
perror_plus("Could not stat hook");
1292
}
1293
return 0;
1294
}
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1301
return 0;
1302
}
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1309
return 0;
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1315
return 1;
1316
}
1317
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1319
int ret;
1320
struct timespec now;
1321
struct timespec waited_time;
1322
intmax_t block_time;
1323
1324
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1329
}
1330
ret = avahi_simple_poll_iterate(s, -1);
1331
} else {
1332
if (debug){
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1335
}
1336
/* the current time */
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
/* Calculating in ms how long time between now and server
1343
who we visted longest time ago. Now - last seen. */
1344
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1346
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1348
/* total time is 10s/10,000ms.
1349
Converting to s from ms by dividing by 1,000,
1350
and ns to ms by dividing by 1,000,000. */
1351
block_time = ((retry_interval
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1355
if (debug){
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1358
}
1359
1360
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1365
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1367
return 0;
1368
}
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1371
if(ret == -1){
1372
perror_plus("clock_gettime");
1373
return -1;
1374
}
1375
mc.current_server = mc.current_server->next;
1376
block_time = 0; /* Call avahi to find new Mandos
1377
servers, but don't block */
1378
}
1379
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
}
1382
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1384
return (ret != 1) ? ret : 0;
1385
}
1386
}
1387
}
1388
}
1389
1390
bool run_network_hooks(const char *mode, const char *interface,
1391
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1397
if(numhooks == -1){
1398
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1406
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1475
free(delaystring);
1476
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1477
perror_plus("execl");
1478
_exit(EXIT_FAILURE);
1479
}
1480
} else {
1481
int status;
1482
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1483
perror_plus("waitpid");
1484
free(fullname);
1485
continue;
1486
}
1487
if(WIFEXITED(status)){
1488
if(WEXITSTATUS(status) != 0){
1489
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1490
" with status %d\n", direntry->d_name,
1491
WEXITSTATUS(status));
1492
free(fullname);
1493
continue;
1494
}
1495
} else if(WIFSIGNALED(status)){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1497
" signal %d\n", direntry->d_name,
1498
WTERMSIG(status));
1499
free(fullname);
1500
continue;
1501
} else {
1502
fprintf_plus(stderr, "Warning: network hook \"%s\""
1503
" crashed\n", direntry->d_name);
1504
free(fullname);
1505
continue;
1506
}
1507
}
1508
free(fullname);
1509
if(debug){
1510
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1511
direntry->d_name);
1512
}
1513
}
1514
close(devnull);
1515
}
1516
return true;
1517
}
1518
1519
int main(int argc, char *argv[]){
1520
AvahiSServiceBrowser *sb = NULL;
1521
int error;
1522
int ret;
1523
intmax_t tmpmax;
1524
char *tmp;
1525
int exitcode = EXIT_SUCCESS;
1526
const char *interface = "";
1527
struct ifreq network;
1528
int sd = -1;
1529
bool take_down_interface = false;
1530
uid_t uid;
1531
gid_t gid;
1532
char tempdir[] = "/tmp/mandosXXXXXX";
1533
bool tempdir_created = false;
1534
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1535
const char *seckey = PATHDIR "/" SECKEY;
1536
const char *pubkey = PATHDIR "/" PUBKEY;
1537
1538
bool gnutls_initialized = false;
1539
bool gpgme_initialized = false;
1540
float delay = 2.5f;
1541
double retry_interval = 10; /* 10s between trying a server and
1542
retrying the same server again */
1543
1544
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1545
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1546
1547
uid = getuid();
1548
gid = getgid();
1549
1550
/* Lower any group privileges we might have, just to be safe */
1551
errno = 0;
1552
ret = setgid(gid);
1553
if(ret == -1){
1554
perror_plus("setgid");
1555
}
1556
1557
/* Lower user privileges (temporarily) */
1558
errno = 0;
1559
ret = seteuid(uid);
1560
if(ret == -1){
1561
perror_plus("seteuid");
1562
}
1563
1564
if(quit_now){
1565
goto end;
1566
}
1567
1568
{
1569
struct argp_option options[] = {
1570
{ .name = "debug", .key = 128,
1571
.doc = "Debug mode", .group = 3 },
1572
{ .name = "connect", .key = 'c',
1573
.arg = "ADDRESS:PORT",
1574
.doc = "Connect directly to a specific Mandos server",
1575
.group = 1 },
1576
{ .name = "interface", .key = 'i',
1577
.arg = "NAME",
1578
.doc = "Network interface that will be used to search for"
1579
" Mandos servers",
1580
.group = 1 },
1581
{ .name = "seckey", .key = 's',
1582
.arg = "FILE",
1583
.doc = "OpenPGP secret key file base name",
1584
.group = 1 },
1585
{ .name = "pubkey", .key = 'p',
1586
.arg = "FILE",
1587
.doc = "OpenPGP public key file base name",
1588
.group = 2 },
1589
{ .name = "dh-bits", .key = 129,
1590
.arg = "BITS",
1591
.doc = "Bit length of the prime number used in the"
1592
" Diffie-Hellman key exchange",
1593
.group = 2 },
1594
{ .name = "priority", .key = 130,
1595
.arg = "STRING",
1596
.doc = "GnuTLS priority string for the TLS handshake",
1597
.group = 1 },
1598
{ .name = "delay", .key = 131,
1599
.arg = "SECONDS",
1600
.doc = "Maximum delay to wait for interface startup",
1601
.group = 2 },
1602
{ .name = "retry", .key = 132,
1603
.arg = "SECONDS",
1604
.doc = "Retry interval used when denied by the mandos server",
1605
.group = 2 },
1606
{ .name = "network-hook-dir", .key = 133,
1607
.arg = "DIR",
1608
.doc = "Directory where network hooks are located",
1609
.group = 2 },
1610
/*
1611
* These reproduce what we would get without ARGP_NO_HELP
1612
*/
1613
{ .name = "help", .key = '?',
1614
.doc = "Give this help list", .group = -1 },
1615
{ .name = "usage", .key = -3,
1616
.doc = "Give a short usage message", .group = -1 },
1617
{ .name = "version", .key = 'V',
1618
.doc = "Print program version", .group = -1 },
1619
{ .name = NULL }
1620
};
1621
1622
error_t parse_opt(int key, char *arg,
1623
struct argp_state *state){
1624
errno = 0;
1625
switch(key){
1626
case 128: /* --debug */
1627
debug = true;
1628
break;
1629
case 'c': /* --connect */
1630
connect_to = arg;
1631
break;
1632
case 'i': /* --interface */
1633
interface = arg;
1634
break;
1635
case 's': /* --seckey */
1636
seckey = arg;
1637
break;
1638
case 'p': /* --pubkey */
1639
pubkey = arg;
1640
break;
1641
case 129: /* --dh-bits */
1642
errno = 0;
1643
tmpmax = strtoimax(arg, &tmp, 10);
1644
if(errno != 0 or tmp == arg or *tmp != '\0'
1645
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1646
argp_error(state, "Bad number of DH bits");
1647
}
1648
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1649
break;
1650
case 130: /* --priority */
1651
mc.priority = arg;
1652
break;
1653
case 131: /* --delay */
1654
errno = 0;
1655
delay = strtof(arg, &tmp);
1656
if(errno != 0 or tmp == arg or *tmp != '\0'){
1657
argp_error(state, "Bad delay");
1658
}
1659
case 132: /* --retry */
1660
errno = 0;
1661
retry_interval = strtod(arg, &tmp);
1662
if(errno != 0 or tmp == arg or *tmp != '\0'
1663
or (retry_interval * 1000) > INT_MAX
1664
or retry_interval < 0){
1665
argp_error(state, "Bad retry interval");
1666
}
1667
break;
1668
case 133: /* --network-hook-dir */
1669
hookdir = arg;
1670
break;
1671
/*
1672
* These reproduce what we would get without ARGP_NO_HELP
1673
*/
1674
case '?': /* --help */
1675
argp_state_help(state, state->out_stream,
1676
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1677
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1678
case -3: /* --usage */
1679
argp_state_help(state, state->out_stream,
1680
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1681
case 'V': /* --version */
1682
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1683
exit(argp_err_exit_status);
1684
break;
1685
default:
1686
return ARGP_ERR_UNKNOWN;
1687
}
1688
return errno;
1689
}
1690
1691
struct argp argp = { .options = options, .parser = parse_opt,
1692
.args_doc = "",
1693
.doc = "Mandos client -- Get and decrypt"
1694
" passwords from a Mandos server" };
1695
ret = argp_parse(&argp, argc, argv,
1696
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1697
switch(ret){
1698
case 0:
1699
break;
1700
case ENOMEM:
1701
default:
1702
errno = ret;
1703
perror_plus("argp_parse");
1704
exitcode = EX_OSERR;
1705
goto end;
1706
case EINVAL:
1707
exitcode = EX_USAGE;
1708
goto end;
1709
}
1710
}
1711
1712
{
1713
/* Work around Debian bug #633582:
1714
<http://bugs.debian.org/633582> */
1715
1716
/* Re-raise priviliges */
1717
errno = 0;
1718
ret = seteuid(0);
1719
if(ret == -1){
1720
perror_plus("seteuid");
1721
} else {
1722
struct stat st;
1723
1724
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1725
int seckey_fd = open(seckey, O_RDONLY);
1726
if(seckey_fd == -1){
1727
perror_plus("open");
1728
} else {
1729
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1730
if(ret == -1){
1731
perror_plus("fstat");
1732
} else {
1733
if(S_ISREG(st.st_mode)
1734
and st.st_uid == 0 and st.st_gid == 0){
1735
ret = fchown(seckey_fd, uid, gid);
1736
if(ret == -1){
1737
perror_plus("fchown");
1738
}
1739
}
1740
}
1741
TEMP_FAILURE_RETRY(close(seckey_fd));
1742
}
1743
}
1744
1745
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1746
int pubkey_fd = open(pubkey, O_RDONLY);
1747
if(pubkey_fd == -1){
1748
perror_plus("open");
1749
} else {
1750
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1751
if(ret == -1){
1752
perror_plus("fstat");
1753
} else {
1754
if(S_ISREG(st.st_mode)
1755
and st.st_uid == 0 and st.st_gid == 0){
1756
ret = fchown(pubkey_fd, uid, gid);
1757
if(ret == -1){
1758
perror_plus("fchown");
1759
}
1760
}
1761
}
1762
TEMP_FAILURE_RETRY(close(pubkey_fd));
1763
}
1764
}
1765
1766
/* Lower privileges */
1767
errno = 0;
1768
ret = seteuid(uid);
1769
if(ret == -1){
1770
perror_plus("seteuid");
1771
}
1772
}
1773
}
1774
1775
/* Run network hooks */
1776
if(not run_network_hooks("start", interface, delay)){
1777
goto end;
1778
}
1779
1780
if(not debug){
1781
avahi_set_log_function(empty_log);
1782
}
1783
1784
if(interface[0] == '\0'){
1785
struct dirent **direntries;
1786
/* First look for interfaces that are up */
1787
ret = scandir(sys_class_net, &direntries, up_interface,
1788
alphasort);
1789
if(ret == 0){
1790
/* No up interfaces, look for any good interfaces */
1791
free(direntries);
1792
ret = scandir(sys_class_net, &direntries, good_interface,
1793
alphasort);
1794
}
1795
if(ret >= 1){
1796
/* Pick the first interface returned */
1797
interface = strdup(direntries[0]->d_name);
1798
if(debug){
1799
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1800
}
1801
if(interface == NULL){
1802
perror_plus("malloc");
1803
free(direntries);
1804
exitcode = EXIT_FAILURE;
1805
goto end;
1806
}
1807
free(direntries);
1808
} else {
1809
free(direntries);
1810
fprintf_plus(stderr, "Could not find a network interface\n");
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
}
1815
1816
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1817
from the signal handler */
1818
/* Initialize the pseudo-RNG for Avahi */
1819
srand((unsigned int) time(NULL));
1820
mc.simple_poll = avahi_simple_poll_new();
1821
if(mc.simple_poll == NULL){
1822
fprintf_plus(stderr,
1823
"Avahi: Failed to create simple poll object.\n");
1824
exitcode = EX_UNAVAILABLE;
1825
goto end;
1826
}
1827
1828
sigemptyset(&sigterm_action.sa_mask);
1829
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1830
if(ret == -1){
1831
perror_plus("sigaddset");
1832
exitcode = EX_OSERR;
1833
goto end;
1834
}
1835
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1836
if(ret == -1){
1837
perror_plus("sigaddset");
1838
exitcode = EX_OSERR;
1839
goto end;
1840
}
1841
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1842
if(ret == -1){
1843
perror_plus("sigaddset");
1844
exitcode = EX_OSERR;
1845
goto end;
1846
}
1847
/* Need to check if the handler is SIG_IGN before handling:
1848
| [[info:libc:Initial Signal Actions]] |
1849
| [[info:libc:Basic Signal Handling]] |
1850
*/
1851
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1852
if(ret == -1){
1853
perror_plus("sigaction");
1854
return EX_OSERR;
1855
}
1856
if(old_sigterm_action.sa_handler != SIG_IGN){
1857
ret = sigaction(SIGINT, &sigterm_action, NULL);
1858
if(ret == -1){
1859
perror_plus("sigaction");
1860
exitcode = EX_OSERR;
1861
goto end;
1862
}
1863
}
1864
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1865
if(ret == -1){
1866
perror_plus("sigaction");
1867
return EX_OSERR;
1868
}
1869
if(old_sigterm_action.sa_handler != SIG_IGN){
1870
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1871
if(ret == -1){
1872
perror_plus("sigaction");
1873
exitcode = EX_OSERR;
1874
goto end;
1875
}
1876
}
1877
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1878
if(ret == -1){
1879
perror_plus("sigaction");
1880
return EX_OSERR;
1881
}
1882
if(old_sigterm_action.sa_handler != SIG_IGN){
1883
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1884
if(ret == -1){
1885
perror_plus("sigaction");
1886
exitcode = EX_OSERR;
1887
goto end;
1888
}
1889
}
1890
1891
/* If the interface is down, bring it up */
1892
if(strcmp(interface, "none") != 0){
1893
if_index = (AvahiIfIndex) if_nametoindex(interface);
1894
if(if_index == 0){
1895
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1896
exitcode = EX_UNAVAILABLE;
1897
goto end;
1898
}
1899
1900
if(quit_now){
1901
goto end;
1902
}
1903
1904
/* Re-raise priviliges */
1905
errno = 0;
1906
ret = seteuid(0);
1907
if(ret == -1){
1908
perror_plus("seteuid");
1909
}
1910
1911
#ifdef __linux__
1912
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1913
messages about the network interface to mess up the prompt */
1914
ret = klogctl(8, NULL, 5);
1915
bool restore_loglevel = true;
1916
if(ret == -1){
1917
restore_loglevel = false;
1918
perror_plus("klogctl");
1919
}
1920
#endif /* __linux__ */
1921
1922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1923
if(sd < 0){
1924
perror_plus("socket");
1925
exitcode = EX_OSERR;
1926
#ifdef __linux__
1927
if(restore_loglevel){
1928
ret = klogctl(7, NULL, 0);
1929
if(ret == -1){
1930
perror_plus("klogctl");
1931
}
1932
}
1933
#endif /* __linux__ */
1934
/* Lower privileges */
1935
errno = 0;
1936
ret = seteuid(uid);
1937
if(ret == -1){
1938
perror_plus("seteuid");
1939
}
1940
goto end;
1941
}
1942
strcpy(network.ifr_name, interface);
1943
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1944
if(ret == -1){
1945
perror_plus("ioctl SIOCGIFFLAGS");
1946
#ifdef __linux__
1947
if(restore_loglevel){
1948
ret = klogctl(7, NULL, 0);
1949
if(ret == -1){
1950
perror_plus("klogctl");
1951
}
1952
}
1953
#endif /* __linux__ */
1954
exitcode = EX_OSERR;
1955
/* Lower privileges */
1956
errno = 0;
1957
ret = seteuid(uid);
1958
if(ret == -1){
1959
perror_plus("seteuid");
1960
}
1961
goto end;
1962
}
1963
if((network.ifr_flags & IFF_UP) == 0){
1964
network.ifr_flags |= IFF_UP;
1965
take_down_interface = true;
1966
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1967
if(ret == -1){
1968
take_down_interface = false;
1969
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1970
exitcode = EX_OSERR;
1971
#ifdef __linux__
1972
if(restore_loglevel){
1973
ret = klogctl(7, NULL, 0);
1974
if(ret == -1){
1975
perror_plus("klogctl");
1976
}
1977
}
1978
#endif /* __linux__ */
1979
/* Lower privileges */
1980
errno = 0;
1981
ret = seteuid(uid);
1982
if(ret == -1){
1983
perror_plus("seteuid");
1984
}
1985
goto end;
1986
}
1987
}
1988
/* Sleep checking until interface is running.
1989
Check every 0.25s, up to total time of delay */
1990
for(int i=0; i < delay * 4; i++){
1991
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1992
if(ret == -1){
1993
perror_plus("ioctl SIOCGIFFLAGS");
1994
} else if(network.ifr_flags & IFF_RUNNING){
1995
break;
1996
}
1997
struct timespec sleeptime = { .tv_nsec = 250000000 };
1998
ret = nanosleep(&sleeptime, NULL);
1999
if(ret == -1 and errno != EINTR){
2000
perror_plus("nanosleep");
2001
}
2002
}
2003
if(not take_down_interface){
2004
/* We won't need the socket anymore */
2005
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2006
if(ret == -1){
2007
perror_plus("close");
2008
}
2009
}
2010
#ifdef __linux__
2011
if(restore_loglevel){
2012
/* Restores kernel loglevel to default */
2013
ret = klogctl(7, NULL, 0);
2014
if(ret == -1){
2015
perror_plus("klogctl");
2016
}
2017
}
2018
#endif /* __linux__ */
2019
/* Lower privileges */
2020
errno = 0;
2021
/* Lower privileges */
2022
ret = seteuid(uid);
2023
if(ret == -1){
2024
perror_plus("seteuid");
2025
}
2026
}
2027
2028
if(quit_now){
2029
goto end;
2030
}
2031
2032
ret = init_gnutls_global(pubkey, seckey);
2033
if(ret == -1){
2034
fprintf_plus(stderr, "init_gnutls_global failed\n");
2035
exitcode = EX_UNAVAILABLE;
2036
goto end;
2037
} else {
2038
gnutls_initialized = true;
2039
}
2040
2041
if(quit_now){
2042
goto end;
2043
}
2044
2045
if(mkdtemp(tempdir) == NULL){
2046
perror_plus("mkdtemp");
2047
goto end;
2048
}
2049
tempdir_created = true;
2050
2051
if(quit_now){
2052
goto end;
2053
}
2054
2055
if(not init_gpgme(pubkey, seckey, tempdir)){
2056
fprintf_plus(stderr, "init_gpgme failed\n");
2057
exitcode = EX_UNAVAILABLE;
2058
goto end;
2059
} else {
2060
gpgme_initialized = true;
2061
}
2062
2063
if(quit_now){
2064
goto end;
2065
}
2066
2067
if(connect_to != NULL){
2068
/* Connect directly, do not use Zeroconf */
2069
/* (Mainly meant for debugging) */
2070
char *address = strrchr(connect_to, ':');
2071
if(address == NULL){
2072
fprintf_plus(stderr, "No colon in address\n");
2073
exitcode = EX_USAGE;
2074
goto end;
2075
}
2076
2077
if(quit_now){
2078
goto end;
2079
}
2080
2081
uint16_t port;
2082
errno = 0;
2083
tmpmax = strtoimax(address+1, &tmp, 10);
2084
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2085
or tmpmax != (uint16_t)tmpmax){
2086
fprintf_plus(stderr, "Bad port number\n");
2087
exitcode = EX_USAGE;
2088
goto end;
2089
}
2090
2091
if(quit_now){
2092
goto end;
2093
}
2094
2095
port = (uint16_t)tmpmax;
2096
*address = '\0';
2097
/* Colon in address indicates IPv6 */
2098
int af;
2099
if(strchr(connect_to, ':') != NULL){
2100
af = AF_INET6;
2101
/* Accept [] around IPv6 address - see RFC 5952 */
2102
if(connect_to[0] == '[' and address[-1] == ']')
2103
{
2104
connect_to++;
2105
address[-1] = '\0';
2106
}
2107
} else {
2108
af = AF_INET;
2109
}
2110
address = connect_to;
2111
2112
if(quit_now){
2113
goto end;
2114
}
2115
2116
while(not quit_now){
2117
ret = start_mandos_communication(address, port, if_index, af);
2118
if(quit_now or ret == 0){
2119
break;
2120
}
2121
if(debug){
2122
fprintf_plus(stderr, "Retrying in %d seconds\n",
2123
(int)retry_interval);
2124
}
2125
sleep((int)retry_interval);
2126
}
2127
2128
if (not quit_now){
2129
exitcode = EXIT_SUCCESS;
2130
}
2131
2132
goto end;
2133
}
2134
2135
if(quit_now){
2136
goto end;
2137
}
2138
2139
{
507
2140
AvahiServerConfig config;
508
AvahiSServiceBrowser *sb = NULL;
509
int error;
510
int ret = 1;
511
512
avahi_set_log_function(empty_log);
513
514
/* Initialize the psuedo-RNG */
515
srand(time(NULL));
516
517
/* Allocate main loop object */
518
if (!(simple_poll = avahi_simple_poll_new())) {
519
fprintf(stderr, "Failed to create simple poll object.\n");
520
goto fail;
521
}
522
523
/* Do not publish any local records */
2141
/* Do not publish any local Zeroconf records */
524
2142
avahi_server_config_init(&config);
525
2143
config.publish_hinfo = 0;
526
2144
config.publish_addresses = 0;
527
2145
config.publish_workstation = 0;
528
2146
config.publish_domain = 0;
529
530
/* /\* Set a unicast DNS server for wide area DNS-SD *\/ */
531
/* avahi_address_parse("193.11.177.11", AVAHI_PROTO_UNSPEC, &config.wide_area_servers[0]); */
532
/* config.n_wide_area_servers = 1; */
533
/* config.enable_wide_area = 1; */
534
2147
535
2148
/* Allocate a new server */
536
server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
537
538
/* Free the configuration data */
2149
mc.server = avahi_server_new(avahi_simple_poll_get
2150
(mc.simple_poll), &config, NULL,
2151
NULL, &error);
2152
2153
/* Free the Avahi configuration data */
539
2154
avahi_server_config_free(&config);
540
541
/* Check wether creating the server object succeeded */
542
if (!server) {
543
fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
544
goto fail;
545
}
546
547
/* Create the service browser */
548
if (!(sb = avahi_s_service_browser_new(server, if_nametoindex("eth0"), AVAHI_PROTO_INET6, "_mandos._tcp", NULL, 0, browse_callback, server))) {
549
fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
550
goto fail;
551
}
552
553
/* Run the main loop */
554
avahi_simple_poll_loop(simple_poll);
555
556
ret = 0;
557
558
fail:
559
560
/* Cleanup things */
561
if (sb)
562
avahi_s_service_browser_free(sb);
563
564
if (server)
565
avahi_server_free(server);
566
567
if (simple_poll)
568
avahi_simple_poll_free(simple_poll);
569
570
return ret;
2155
}
2156
2157
/* Check if creating the Avahi server object succeeded */
2158
if(mc.server == NULL){
2159
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2160
avahi_strerror(error));
2161
exitcode = EX_UNAVAILABLE;
2162
goto end;
2163
}
2164
2165
if(quit_now){
2166
goto end;
2167
}
2168
2169
/* Create the Avahi service browser */
2170
sb = avahi_s_service_browser_new(mc.server, if_index,
2171
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2172
NULL, 0, browse_callback, NULL);
2173
if(sb == NULL){
2174
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2175
avahi_strerror(avahi_server_errno(mc.server)));
2176
exitcode = EX_UNAVAILABLE;
2177
goto end;
2178
}
2179
2180
if(quit_now){
2181
goto end;
2182
}
2183
2184
/* Run the main loop */
2185
2186
if(debug){
2187
fprintf_plus(stderr, "Starting Avahi loop search\n");
2188
}
2189
2190
ret = avahi_loop_with_timeout(mc.simple_poll,
2191
(int)(retry_interval * 1000));
2192
if(debug){
2193
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2195
}
2196
2197
end:
2198
2199
if(debug){
2200
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2201
}
2202
2203
/* Cleanup things */
2204
if(sb != NULL)
2205
avahi_s_service_browser_free(sb);
2206
2207
if(mc.server != NULL)
2208
avahi_server_free(mc.server);
2209
2210
if(mc.simple_poll != NULL)
2211
avahi_simple_poll_free(mc.simple_poll);
2212
2213
if(gnutls_initialized){
2214
gnutls_certificate_free_credentials(mc.cred);
2215
gnutls_global_deinit();
2216
gnutls_dh_params_deinit(mc.dh_params);
2217
}
2218
2219
if(gpgme_initialized){
2220
gpgme_release(mc.ctx);
2221
}
2222
2223
/* Cleans up the circular linked list of Mandos servers the client
2224
has seen */
2225
if(mc.current_server != NULL){
2226
mc.current_server->prev->next = NULL;
2227
while(mc.current_server != NULL){
2228
server *next = mc.current_server->next;
2229
free(mc.current_server);
2230
mc.current_server = next;
2231
}
2232
}
2233
2234
/* Run network hooks */
2235
run_network_hooks("stop", interface, delay);
2236
2237
/* Re-raise priviliges */
2238
{
2239
errno = 0;
2240
ret = seteuid(0);
2241
if(ret == -1){
2242
perror_plus("seteuid");
2243
}
2244
2245
/* Take down the network interface */
2246
if(take_down_interface and geteuid() == 0){
2247
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2248
if(ret == -1){
2249
perror_plus("ioctl SIOCGIFFLAGS");
2250
} else if(network.ifr_flags & IFF_UP){
2251
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2252
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2253
if(ret == -1){
2254
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2255
}
2256
}
2257
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2258
if(ret == -1){
2259
perror_plus("close");
2260
}
2261
}
2262
}
2263
/* Lower privileges permanently */
2264
errno = 0;
2265
ret = setuid(uid);
2266
if(ret == -1){
2267
perror_plus("setuid");
2268
}
2269
2270
/* Removes the GPGME temp directory and all files inside */
2271
if(tempdir_created){
2272
struct dirent **direntries = NULL;
2273
struct dirent *direntry = NULL;
2274
int numentries = scandir(tempdir, &direntries, notdotentries,
2275
alphasort);
2276
if (numentries > 0){
2277
for(int i = 0; i < numentries; i++){
2278
direntry = direntries[i];
2279
char *fullname = NULL;
2280
ret = asprintf(&fullname, "%s/%s", tempdir,
2281
direntry->d_name);
2282
if(ret < 0){
2283
perror_plus("asprintf");
2284
continue;
2285
}
2286
ret = remove(fullname);
2287
if(ret == -1){
2288
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2289
strerror(errno));
2290
}
2291
free(fullname);
2292
}
2293
}
2294
2295
/* need to clean even if 0 because man page doesn't specify */
2296
free(direntries);
2297
if (numentries == -1){
2298
perror_plus("scandir");
2299
}
2300
ret = rmdir(tempdir);
2301
if(ret == -1 and errno != ENOENT){
2302
perror_plus("rmdir");
2303
}
2304
}
2305
2306
if(quit_now){
2307
sigemptyset(&old_sigterm_action.sa_mask);
2308
old_sigterm_action.sa_handler = SIG_DFL;
2309
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2310
&old_sigterm_action,
2311
NULL));
2312
if(ret == -1){
2313
perror_plus("sigaction");
2314
}
2315
do {
2316
ret = raise(signal_received);
2317
} while(ret != 0 and errno == EINTR);
2318
if(ret != 0){
2319
perror_plus("raise");
2320
abort();
2321
}
2322
TEMP_FAILURE_RETRY(pause());
2323
}
2324
2325
return exitcode;
571
2326
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0