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- Committer: Teddy Hogeborn
- Date: 2018-04-01 22:08:50 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 368.
- Revision ID: teddy@recompile.se-20180401220850-11kc7596lknn4piy
Check for and report GPGME key import errors
* plugins.d/mandos-client.c (init_gpgme/import_key): After
gpgme_op_import(), call gpgme_op_import_result() to see if it
worked. If not, print all available information.
* plugins.d/mandos-client.c (init_gpgme/import_key): After
gpgme_op_import(), call gpgme_op_import_result() to see if it
worked. If not, print all available information.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* 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
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
31
32
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
54
56
SOCK_STREAM, uid_t, gid_t, open(),
55
57
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
72
program_invocation_short_name */
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
75
SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
72
79
*/
73
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
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getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
77
85
#include <iso646.h> /* not, or, and */
78
86
#include <argp.h> /* struct argp_option, error_t, struct
79
87
argp_state, struct argp,
82
90
#include <signal.h> /* sigemptyset(), sigaddset(),
83
91
sigaction(), SIGTERM, sig_atomic_t,
84
92
raise() */
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
85
104
86
105
#ifdef __linux__
87
106
#include <sys/klog.h> /* klogctl() */
105
124
init_gnutls_session(),
106
125
GNUTLS_* */
107
126
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
110
129
111
130
/* GPGME */
112
131
#include <gpgme.h> /* All GPGME types, constants and
120
139
#define PATHDIR "/conf/conf.d/mandos"
121
140
#define SECKEY "seckey.txt"
122
141
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
143
124
144
bool debug = false;
125
145
static const char mandos_protocol_version[] = "1";
126
146
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
static const char sys_class_net[] = "/sys/class/net";
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
157
const char *ip;
158
in_port_t port;
159
AvahiIfIndex if_index;
160
int af;
161
struct timespec last_seen;
162
struct server *next;
163
struct server *prev;
164
} server;
128
165
129
166
/* Used for passing in values through the Avahi callback functions */
130
167
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
168
AvahiServer *server;
133
169
gnutls_certificate_credentials_t cred;
134
170
unsigned int dh_bits;
135
171
gnutls_dh_params_t dh_params;
136
172
const char *priority;
137
173
gpgme_ctx_t ctx;
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
138
177
} mandos_context;
139
178
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
144
181
145
182
sig_atomic_t quit_now = 0;
146
183
int signal_received = 0;
147
184
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
187
int e = errno;
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
190
errno = e;
191
perror(print_text);
192
}
193
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
203
148
204
/*
149
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
206
* bytes. "buffer_capacity" is how much is currently allocated,
151
207
* "buffer_length" is how much is already used.
152
208
*/
209
__attribute__((nonnull, warn_unused_result))
153
210
size_t incbuffer(char **buffer, size_t buffer_length,
154
size_t buffer_capacity){
211
size_t buffer_capacity){
155
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
if(buffer == NULL){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
158
219
return 0;
159
220
}
221
*buffer = new_buf;
160
222
buffer_capacity += BUFFER_SIZE;
161
223
}
162
224
return buffer_capacity;
163
225
}
164
226
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
231
int ret;
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
235
return false;
236
}
237
*new_server = (server){ .ip = strdup(ip),
238
.port = port,
239
.if_index = if_index,
240
.af = af };
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
259
}
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
265
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
273
}
274
165
275
/*
166
276
* Initialize GPGME.
167
277
*/
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
170
283
gpgme_error_t rc;
171
284
gpgme_engine_info_t engine_info;
172
285
173
174
286
/*
175
287
* Helper function to insert pub and seckey to the engine keyring.
176
288
*/
177
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
178
290
int ret;
179
291
int fd;
180
292
gpgme_data_t pgp_data;
181
293
182
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
183
295
if(fd == -1){
184
perror("open");
296
perror_plus("open");
185
297
return false;
186
298
}
187
299
188
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
189
301
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
192
304
return false;
193
305
}
194
306
195
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
196
308
if(rc != GPG_ERR_NO_ERROR){
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
199
311
return false;
200
312
}
313
{
314
gpgme_import_result_t import_result
315
= gpgme_op_import_result(mc->ctx);
316
if((import_result->imported < 1
317
or import_result->not_imported > 0)
318
and import_result->unchanged == 0){
319
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
320
fprintf_plus(stderr,
321
"The total number of considered keys: %d\n",
322
import_result->considered);
323
fprintf_plus(stderr,
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
326
fprintf_plus(stderr,
327
"The total number of imported keys: %d\n",
328
import_result->imported);
329
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
330
import_result->imported_rsa);
331
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
332
import_result->unchanged);
333
fprintf_plus(stderr, "The number of new user IDs: %d\n",
334
import_result->new_user_ids);
335
fprintf_plus(stderr, "The number of new sub keys: %d\n",
336
import_result->new_sub_keys);
337
fprintf_plus(stderr, "The number of new signatures: %d\n",
338
import_result->new_signatures);
339
fprintf_plus(stderr, "The number of new revocations: %d\n",
340
import_result->new_revocations);
341
fprintf_plus(stderr,
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
344
fprintf_plus(stderr,
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
347
fprintf_plus(stderr,
348
"The number of unchanged secret keys: %d\n",
349
import_result->secret_unchanged);
350
fprintf_plus(stderr, "The number of keys not imported: %d\n",
351
import_result->not_imported);
352
for(gpgme_import_status_t import_status
353
= import_result->imports;
354
import_status != NULL;
355
import_status = import_status->next){
356
fprintf_plus(stderr, "Import status for key: %s\n",
357
import_status->fpr);
358
if(import_status->result != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Import result: %s: %s\n",
360
gpgme_strsource(import_status->result),
361
gpgme_strerror(import_status->result));
362
}
363
fprintf_plus(stderr, "Key status:\n");
364
fprintf_plus(stderr,
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
368
fprintf_plus(stderr,
369
import_status->status & GPGME_IMPORT_UID
370
? "The key contained new user IDs.\n"
371
: "The key did not contain new user IDs.\n");
372
fprintf_plus(stderr,
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
376
fprintf_plus(stderr,
377
import_status->status & GPGME_IMPORT_SUBKEY
378
? "The key contained new sub keys.\n"
379
: "The key did not contain new sub keys.\n");
380
fprintf_plus(stderr,
381
import_status->status & GPGME_IMPORT_SECRET
382
? "The key contained a secret key.\n"
383
: "The key did not contain a secret key.\n");
384
}
385
return false;
386
}
387
}
201
388
202
ret = (int)TEMP_FAILURE_RETRY(close(fd));
389
ret = close(fd);
203
390
if(ret == -1){
204
perror("close");
391
perror_plus("close");
205
392
}
206
393
gpgme_data_release(pgp_data);
207
394
return true;
208
395
}
209
396
210
397
if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
398
fprintf_plus(stderr, "Initializing GPGME\n");
212
399
}
213
400
214
401
/* Init GPGME */
215
402
gpgme_check_version(NULL);
216
403
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
217
404
if(rc != GPG_ERR_NO_ERROR){
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
405
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
406
gpgme_strsource(rc), gpgme_strerror(rc));
220
407
return false;
221
408
}
222
409
223
/* Set GPGME home directory for the OpenPGP engine only */
410
/* Set GPGME home directory for the OpenPGP engine only */
224
411
rc = gpgme_get_engine_info(&engine_info);
225
412
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
413
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
228
415
return false;
229
416
}
230
417
while(engine_info != NULL){
236
423
engine_info = engine_info->next;
237
424
}
238
425
if(engine_info == NULL){
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
426
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
427
tempdir);
240
428
return false;
241
429
}
242
430
243
431
/* Create new GPGME "context" */
244
rc = gpgme_new(&(mc.ctx));
432
rc = gpgme_new(&(mc->ctx));
245
433
if(rc != GPG_ERR_NO_ERROR){
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
248
436
return false;
249
437
}
250
438
259
447
* Decrypt OpenPGP data.
260
448
* Returns -1 on error
261
449
*/
450
__attribute__((nonnull, warn_unused_result))
262
451
static ssize_t pgp_packet_decrypt(const char *cryptotext,
263
452
size_t crypto_size,
264
char **plaintext){
453
char **plaintext,
454
mandos_context *mc){
265
455
gpgme_data_t dh_crypto, dh_plain;
266
456
gpgme_error_t rc;
267
457
ssize_t ret;
269
459
ssize_t plaintext_length = 0;
270
460
271
461
if(debug){
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
462
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
273
463
}
274
464
275
465
/* Create new GPGME data buffer from memory cryptotext */
276
466
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
277
467
0);
278
468
if(rc != GPG_ERR_NO_ERROR){
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
469
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
470
gpgme_strsource(rc), gpgme_strerror(rc));
281
471
return -1;
282
472
}
283
473
284
474
/* Create new empty GPGME data buffer for the plaintext */
285
475
rc = gpgme_data_new(&dh_plain);
286
476
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
478
gpgme_strsource(rc), gpgme_strerror(rc));
289
479
gpgme_data_release(dh_crypto);
290
480
return -1;
291
481
}
292
482
293
483
/* Decrypt data from the cryptotext data buffer to the plaintext
294
484
data buffer */
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
485
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
296
486
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
487
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
488
gpgme_strsource(rc), gpgme_strerror(rc));
299
489
plaintext_length = -1;
300
490
if(debug){
301
491
gpgme_decrypt_result_t result;
302
result = gpgme_op_decrypt_result(mc.ctx);
492
result = gpgme_op_decrypt_result(mc->ctx);
303
493
if(result == NULL){
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
494
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
305
495
} else {
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
496
if(result->unsupported_algorithm != NULL) {
497
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
498
result->unsupported_algorithm);
499
}
500
fprintf_plus(stderr, "Wrong key usage: %s\n",
501
result->wrong_key_usage ? "Yes" : "No");
310
502
if(result->file_name != NULL){
311
fprintf(stderr, "File name: %s\n", result->file_name);
503
fprintf_plus(stderr, "File name: %s\n", result->file_name);
312
504
}
313
505
gpgme_recipient_t recipient;
314
506
recipient = result->recipients;
315
507
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
508
fprintf_plus(stderr, "Public key algorithm: %s\n",
509
gpgme_pubkey_algo_name
510
(recipient->pubkey_algo));
511
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
512
fprintf_plus(stderr, "Secret key available: %s\n",
513
recipient->status == GPG_ERR_NO_SECKEY
514
? "No" : "Yes");
322
515
recipient = recipient->next;
323
516
}
324
517
}
327
520
}
328
521
329
522
if(debug){
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
523
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
331
524
}
332
525
333
526
/* Seek back to the beginning of the GPGME plaintext data buffer */
334
527
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
335
perror("gpgme_data_seek");
528
perror_plus("gpgme_data_seek");
336
529
plaintext_length = -1;
337
530
goto decrypt_end;
338
531
}
340
533
*plaintext = NULL;
341
534
while(true){
342
535
plaintext_capacity = incbuffer(plaintext,
343
(size_t)plaintext_length,
344
plaintext_capacity);
536
(size_t)plaintext_length,
537
plaintext_capacity);
345
538
if(plaintext_capacity == 0){
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
539
perror_plus("incbuffer");
540
plaintext_length = -1;
541
goto decrypt_end;
349
542
}
350
543
351
544
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
549
break;
357
550
}
358
551
if(ret < 0){
359
perror("gpgme_data_read");
552
perror_plus("gpgme_data_read");
360
553
plaintext_length = -1;
361
554
goto decrypt_end;
362
555
}
364
557
}
365
558
366
559
if(debug){
367
fprintf(stderr, "Decrypted password is: ");
560
fprintf_plus(stderr, "Decrypted password is: ");
368
561
for(ssize_t i = 0; i < plaintext_length; i++){
369
562
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
370
563
}
381
574
return plaintext_length;
382
575
}
383
576
384
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
387
if(ret == NULL)
388
ret = "(unknown)";
389
return ret;
577
__attribute__((warn_unused_result, const))
578
static const char *safe_string(const char *str){
579
if(str == NULL)
580
return "(unknown)";
581
return str;
582
}
583
584
__attribute__((warn_unused_result))
585
static const char *safer_gnutls_strerror(int value){
586
const char *ret = gnutls_strerror(value);
587
return safe_string(ret);
390
588
}
391
589
392
590
/* GnuTLS log function callback */
591
__attribute__((nonnull))
393
592
static void debuggnutls(__attribute__((unused)) int level,
394
593
const char* string){
395
fprintf(stderr, "GnuTLS: %s", string);
594
fprintf_plus(stderr, "GnuTLS: %s", string);
396
595
}
397
596
597
__attribute__((nonnull(1, 2, 4), warn_unused_result))
398
598
static int init_gnutls_global(const char *pubkeyfilename,
399
const char *seckeyfilename){
599
const char *seckeyfilename,
600
const char *dhparamsfilename,
601
mandos_context *mc){
400
602
int ret;
603
unsigned int uret;
401
604
402
605
if(debug){
403
fprintf(stderr, "Initializing GnuTLS\n");
404
}
405
406
ret = gnutls_global_init();
407
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
410
return -1;
606
fprintf_plus(stderr, "Initializing GnuTLS\n");
411
607
}
412
608
413
609
if(debug){
419
615
}
420
616
421
617
/* OpenPGP credentials */
422
gnutls_certificate_allocate_credentials(&mc.cred);
618
ret = gnutls_certificate_allocate_credentials(&mc->cred);
423
619
if(ret != GNUTLS_E_SUCCESS){
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
429
gnutls_global_deinit();
620
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
621
safer_gnutls_strerror(ret));
430
622
return -1;
431
623
}
432
624
433
625
if(debug){
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
626
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
627
" secret key %s as GnuTLS credentials\n",
628
pubkeyfilename,
629
seckeyfilename);
437
630
}
438
631
439
632
ret = gnutls_certificate_set_openpgp_key_file
440
(mc.cred, pubkeyfilename, seckeyfilename,
633
(mc->cred, pubkeyfilename, seckeyfilename,
441
634
GNUTLS_OPENPGP_FMT_BASE64);
442
635
if(ret != GNUTLS_E_SUCCESS){
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
636
fprintf_plus(stderr,
637
"Error[%d] while reading the OpenPGP key pair ('%s',"
638
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
639
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
640
safer_gnutls_strerror(ret));
448
641
goto globalfail;
449
642
}
450
643
451
644
/* GnuTLS server initialization */
452
ret = gnutls_dh_params_init(&mc.dh_params);
453
if(ret != GNUTLS_E_SUCCESS){
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
456
goto globalfail;
457
}
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
459
if(ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
462
goto globalfail;
463
}
464
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
645
ret = gnutls_dh_params_init(&mc->dh_params);
646
if(ret != GNUTLS_E_SUCCESS){
647
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
648
" initialization: %s\n",
649
safer_gnutls_strerror(ret));
650
goto globalfail;
651
}
652
/* If a Diffie-Hellman parameters file was given, try to use it */
653
if(dhparamsfilename != NULL){
654
gnutls_datum_t params = { .data = NULL, .size = 0 };
655
do {
656
int dhpfile = open(dhparamsfilename, O_RDONLY);
657
if(dhpfile == -1){
658
perror_plus("open");
659
dhparamsfilename = NULL;
660
break;
661
}
662
size_t params_capacity = 0;
663
while(true){
664
params_capacity = incbuffer((char **)¶ms.data,
665
(size_t)params.size,
666
(size_t)params_capacity);
667
if(params_capacity == 0){
668
perror_plus("incbuffer");
669
free(params.data);
670
params.data = NULL;
671
dhparamsfilename = NULL;
672
break;
673
}
674
ssize_t bytes_read = read(dhpfile,
675
params.data + params.size,
676
BUFFER_SIZE);
677
/* EOF */
678
if(bytes_read == 0){
679
break;
680
}
681
/* check bytes_read for failure */
682
if(bytes_read < 0){
683
perror_plus("read");
684
free(params.data);
685
params.data = NULL;
686
dhparamsfilename = NULL;
687
break;
688
}
689
params.size += (unsigned int)bytes_read;
690
}
691
ret = close(dhpfile);
692
if(ret == -1){
693
perror_plus("close");
694
}
695
if(params.data == NULL){
696
dhparamsfilename = NULL;
697
}
698
if(dhparamsfilename == NULL){
699
break;
700
}
701
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
702
GNUTLS_X509_FMT_PEM);
703
if(ret != GNUTLS_E_SUCCESS){
704
fprintf_plus(stderr, "Failed to parse DH parameters in file"
705
" \"%s\": %s\n", dhparamsfilename,
706
safer_gnutls_strerror(ret));
707
dhparamsfilename = NULL;
708
}
709
free(params.data);
710
} while(false);
711
}
712
if(dhparamsfilename == NULL){
713
if(mc->dh_bits == 0){
714
/* Find out the optimal number of DH bits */
715
/* Try to read the private key file */
716
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
717
do {
718
int secfile = open(seckeyfilename, O_RDONLY);
719
if(secfile == -1){
720
perror_plus("open");
721
break;
722
}
723
size_t buffer_capacity = 0;
724
while(true){
725
buffer_capacity = incbuffer((char **)&buffer.data,
726
(size_t)buffer.size,
727
(size_t)buffer_capacity);
728
if(buffer_capacity == 0){
729
perror_plus("incbuffer");
730
free(buffer.data);
731
buffer.data = NULL;
732
break;
733
}
734
ssize_t bytes_read = read(secfile,
735
buffer.data + buffer.size,
736
BUFFER_SIZE);
737
/* EOF */
738
if(bytes_read == 0){
739
break;
740
}
741
/* check bytes_read for failure */
742
if(bytes_read < 0){
743
perror_plus("read");
744
free(buffer.data);
745
buffer.data = NULL;
746
break;
747
}
748
buffer.size += (unsigned int)bytes_read;
749
}
750
close(secfile);
751
} while(false);
752
/* If successful, use buffer to parse private key */
753
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
754
if(buffer.data != NULL){
755
{
756
gnutls_openpgp_privkey_t privkey = NULL;
757
ret = gnutls_openpgp_privkey_init(&privkey);
758
if(ret != GNUTLS_E_SUCCESS){
759
fprintf_plus(stderr, "Error initializing OpenPGP key"
760
" structure: %s",
761
safer_gnutls_strerror(ret));
762
free(buffer.data);
763
buffer.data = NULL;
764
} else {
765
ret = gnutls_openpgp_privkey_import
766
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
769
safer_gnutls_strerror(ret));
770
privkey = NULL;
771
}
772
free(buffer.data);
773
buffer.data = NULL;
774
if(privkey != NULL){
775
/* Use private key to suggest an appropriate
776
sec_param */
777
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
778
gnutls_openpgp_privkey_deinit(privkey);
779
if(debug){
780
fprintf_plus(stderr, "This OpenPGP key implies using"
781
" a GnuTLS security parameter \"%s\".\n",
782
safe_string(gnutls_sec_param_get_name
783
(sec_param)));
784
}
785
}
786
}
787
}
788
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
789
/* Err on the side of caution */
790
sec_param = GNUTLS_SEC_PARAM_ULTRA;
791
if(debug){
792
fprintf_plus(stderr, "Falling back to security parameter"
793
" \"%s\"\n",
794
safe_string(gnutls_sec_param_get_name
795
(sec_param)));
796
}
797
}
798
}
799
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
800
if(uret != 0){
801
mc->dh_bits = uret;
802
if(debug){
803
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
804
" implies %u DH bits; using that.\n",
805
safe_string(gnutls_sec_param_get_name
806
(sec_param)),
807
mc->dh_bits);
808
}
809
} else {
810
fprintf_plus(stderr, "Failed to get implied number of DH"
811
" bits for security parameter \"%s\"): %s\n",
812
safe_string(gnutls_sec_param_get_name
813
(sec_param)),
814
safer_gnutls_strerror(ret));
815
goto globalfail;
816
}
817
} else if(debug){
818
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
819
mc->dh_bits);
820
}
821
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
822
if(ret != GNUTLS_E_SUCCESS){
823
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
824
" bits): %s\n", mc->dh_bits,
825
safer_gnutls_strerror(ret));
826
goto globalfail;
827
}
828
}
829
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
466
830
467
831
return 0;
468
832
469
833
globalfail:
470
834
471
gnutls_certificate_free_credentials(mc.cred);
472
gnutls_global_deinit();
473
gnutls_dh_params_deinit(mc.dh_params);
835
gnutls_certificate_free_credentials(mc->cred);
836
gnutls_dh_params_deinit(mc->dh_params);
474
837
return -1;
475
838
}
476
839
477
static int init_gnutls_session(gnutls_session_t *session){
840
__attribute__((nonnull, warn_unused_result))
841
static int init_gnutls_session(gnutls_session_t *session,
842
mandos_context *mc){
478
843
int ret;
479
844
/* GnuTLS session creation */
480
845
do {
484
849
}
485
850
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
851
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
852
fprintf_plus(stderr,
853
"Error in GnuTLS session initialization: %s\n",
854
safer_gnutls_strerror(ret));
489
855
}
490
856
491
857
{
492
858
const char *err;
493
859
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
860
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
495
861
if(quit_now){
496
862
gnutls_deinit(*session);
497
863
return -1;
498
864
}
499
865
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
500
866
if(ret != GNUTLS_E_SUCCESS){
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
867
fprintf_plus(stderr, "Syntax error at: %s\n", err);
868
fprintf_plus(stderr, "GnuTLS error: %s\n",
869
safer_gnutls_strerror(ret));
504
870
gnutls_deinit(*session);
505
871
return -1;
506
872
}
508
874
509
875
do {
510
876
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
877
mc->cred);
512
878
if(quit_now){
513
879
gnutls_deinit(*session);
514
880
return -1;
515
881
}
516
882
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
517
883
if(ret != GNUTLS_E_SUCCESS){
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
884
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
885
safer_gnutls_strerror(ret));
520
886
gnutls_deinit(*session);
521
887
return -1;
522
888
}
524
890
/* ignore client certificate if any. */
525
891
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
526
892
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
528
529
893
return 0;
530
894
}
531
895
533
897
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
534
898
__attribute__((unused)) const char *txt){}
535
899
900
/* Set effective uid to 0, return errno */
901
__attribute__((warn_unused_result))
902
int raise_privileges(void){
903
int old_errno = errno;
904
int ret = 0;
905
if(seteuid(0) == -1){
906
ret = errno;
907
}
908
errno = old_errno;
909
return ret;
910
}
911
912
/* Set effective and real user ID to 0. Return errno. */
913
__attribute__((warn_unused_result))
914
int raise_privileges_permanently(void){
915
int old_errno = errno;
916
int ret = raise_privileges();
917
if(ret != 0){
918
errno = old_errno;
919
return ret;
920
}
921
if(setuid(0) == -1){
922
ret = errno;
923
}
924
errno = old_errno;
925
return ret;
926
}
927
928
/* Set effective user ID to unprivileged saved user ID */
929
__attribute__((warn_unused_result))
930
int lower_privileges(void){
931
int old_errno = errno;
932
int ret = 0;
933
if(seteuid(uid) == -1){
934
ret = errno;
935
}
936
errno = old_errno;
937
return ret;
938
}
939
940
/* Lower privileges permanently */
941
__attribute__((warn_unused_result))
942
int lower_privileges_permanently(void){
943
int old_errno = errno;
944
int ret = 0;
945
if(setuid(uid) == -1){
946
ret = errno;
947
}
948
errno = old_errno;
949
return ret;
950
}
951
952
/* Helper function to add_local_route() and delete_local_route() */
953
__attribute__((nonnull, warn_unused_result))
954
static bool add_delete_local_route(const bool add,
955
const char *address,
956
AvahiIfIndex if_index){
957
int ret;
958
char helper[] = "mandos-client-iprouteadddel";
959
char add_arg[] = "add";
960
char delete_arg[] = "delete";
961
char debug_flag[] = "--debug";
962
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
963
if(pluginhelperdir == NULL){
964
if(debug){
965
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
966
" variable not set; cannot run helper\n");
967
}
968
return false;
969
}
970
971
char interface[IF_NAMESIZE];
972
if(if_indextoname((unsigned int)if_index, interface) == NULL){
973
perror_plus("if_indextoname");
974
return false;
975
}
976
977
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
978
if(devnull == -1){
979
perror_plus("open(\"/dev/null\", O_RDONLY)");
980
return false;
981
}
982
pid_t pid = fork();
983
if(pid == 0){
984
/* Child */
985
/* Raise privileges */
986
errno = raise_privileges_permanently();
987
if(errno != 0){
988
perror_plus("Failed to raise privileges");
989
/* _exit(EX_NOPERM); */
990
} else {
991
/* Set group */
992
errno = 0;
993
ret = setgid(0);
994
if(ret == -1){
995
perror_plus("setgid");
996
_exit(EX_NOPERM);
997
}
998
/* Reset supplementary groups */
999
errno = 0;
1000
ret = setgroups(0, NULL);
1001
if(ret == -1){
1002
perror_plus("setgroups");
1003
_exit(EX_NOPERM);
1004
}
1005
}
1006
ret = dup2(devnull, STDIN_FILENO);
1007
if(ret == -1){
1008
perror_plus("dup2(devnull, STDIN_FILENO)");
1009
_exit(EX_OSERR);
1010
}
1011
ret = close(devnull);
1012
if(ret == -1){
1013
perror_plus("close");
1014
_exit(EX_OSERR);
1015
}
1016
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1017
if(ret == -1){
1018
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1019
_exit(EX_OSERR);
1020
}
1021
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1022
O_RDONLY
1023
| O_DIRECTORY
1024
| O_PATH
1025
| O_CLOEXEC));
1026
if(helperdir_fd == -1){
1027
perror_plus("open");
1028
_exit(EX_UNAVAILABLE);
1029
}
1030
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1031
helper, O_RDONLY));
1032
if(helper_fd == -1){
1033
perror_plus("openat");
1034
close(helperdir_fd);
1035
_exit(EX_UNAVAILABLE);
1036
}
1037
close(helperdir_fd);
1038
#ifdef __GNUC__
1039
#pragma GCC diagnostic push
1040
#pragma GCC diagnostic ignored "-Wcast-qual"
1041
#endif
1042
if(fexecve(helper_fd, (char *const [])
1043
{ helper, add ? add_arg : delete_arg, (char *)address,
1044
interface, debug ? debug_flag : NULL, NULL },
1045
environ) == -1){
1046
#ifdef __GNUC__
1047
#pragma GCC diagnostic pop
1048
#endif
1049
perror_plus("fexecve");
1050
_exit(EXIT_FAILURE);
1051
}
1052
}
1053
if(pid == -1){
1054
perror_plus("fork");
1055
return false;
1056
}
1057
int status;
1058
pid_t pret = -1;
1059
errno = 0;
1060
do {
1061
pret = waitpid(pid, &status, 0);
1062
if(pret == -1 and errno == EINTR and quit_now){
1063
int errno_raising = 0;
1064
if((errno = raise_privileges()) != 0){
1065
errno_raising = errno;
1066
perror_plus("Failed to raise privileges in order to"
1067
" kill helper program");
1068
}
1069
if(kill(pid, SIGTERM) == -1){
1070
perror_plus("kill");
1071
}
1072
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1073
perror_plus("Failed to lower privileges after killing"
1074
" helper program");
1075
}
1076
return false;
1077
}
1078
} while(pret == -1 and errno == EINTR);
1079
if(pret == -1){
1080
perror_plus("waitpid");
1081
return false;
1082
}
1083
if(WIFEXITED(status)){
1084
if(WEXITSTATUS(status) != 0){
1085
fprintf_plus(stderr, "Error: iprouteadddel exited"
1086
" with status %d\n", WEXITSTATUS(status));
1087
return false;
1088
}
1089
return true;
1090
}
1091
if(WIFSIGNALED(status)){
1092
fprintf_plus(stderr, "Error: iprouteadddel died by"
1093
" signal %d\n", WTERMSIG(status));
1094
return false;
1095
}
1096
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1097
return false;
1098
}
1099
1100
__attribute__((nonnull, warn_unused_result))
1101
static bool add_local_route(const char *address,
1102
AvahiIfIndex if_index){
1103
if(debug){
1104
fprintf_plus(stderr, "Adding route to %s\n", address);
1105
}
1106
return add_delete_local_route(true, address, if_index);
1107
}
1108
1109
__attribute__((nonnull, warn_unused_result))
1110
static bool delete_local_route(const char *address,
1111
AvahiIfIndex if_index){
1112
if(debug){
1113
fprintf_plus(stderr, "Removing route to %s\n", address);
1114
}
1115
return add_delete_local_route(false, address, if_index);
1116
}
1117
536
1118
/* Called when a Mandos server is found */
537
static int start_mandos_communication(const char *ip, uint16_t port,
1119
__attribute__((nonnull, warn_unused_result))
1120
static int start_mandos_communication(const char *ip, in_port_t port,
538
1121
AvahiIfIndex if_index,
539
int af){
1122
int af, mandos_context *mc){
540
1123
int ret, tcp_sd = -1;
541
1124
ssize_t sret;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
1125
struct sockaddr_storage to;
546
1126
char *buffer = NULL;
547
1127
char *decrypted_buffer = NULL;
548
1128
size_t buffer_length = 0;
551
1131
int retval = -1;
552
1132
gnutls_session_t session;
553
1133
int pf; /* Protocol family */
1134
bool route_added = false;
1135
1136
errno = 0;
554
1137
555
1138
if(quit_now){
1139
errno = EINTR;
556
1140
return -1;
557
1141
}
558
1142
564
1148
pf = PF_INET;
565
1149
break;
566
1150
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
1151
fprintf_plus(stderr, "Bad address family: %d\n", af);
1152
errno = EINVAL;
568
1153
return -1;
569
1154
}
570
1155
571
ret = init_gnutls_session(&session);
1156
/* If the interface is specified and we have a list of interfaces */
1157
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1158
/* Check if the interface is one of the interfaces we are using */
1159
bool match = false;
1160
{
1161
char *interface = NULL;
1162
while((interface = argz_next(mc->interfaces,
1163
mc->interfaces_size,
1164
interface))){
1165
if(if_nametoindex(interface) == (unsigned int)if_index){
1166
match = true;
1167
break;
1168
}
1169
}
1170
}
1171
if(not match){
1172
/* This interface does not match any in the list, so we don't
1173
connect to the server */
1174
if(debug){
1175
char interface[IF_NAMESIZE];
1176
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1177
perror_plus("if_indextoname");
1178
} else {
1179
fprintf_plus(stderr, "Skipping server on non-used interface"
1180
" \"%s\"\n",
1181
if_indextoname((unsigned int)if_index,
1182
interface));
1183
}
1184
}
1185
return -1;
1186
}
1187
}
1188
1189
ret = init_gnutls_session(&session, mc);
572
1190
if(ret != 0){
573
1191
return -1;
574
1192
}
575
1193
576
1194
if(debug){
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
1195
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1196
PRIuMAX "\n", ip, (uintmax_t)port);
579
1197
}
580
1198
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
1199
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
582
1200
if(tcp_sd < 0){
583
perror("socket");
1201
int e = errno;
1202
perror_plus("socket");
1203
errno = e;
584
1204
goto mandos_end;
585
1205
}
586
1206
587
1207
if(quit_now){
1208
errno = EINTR;
588
1209
goto mandos_end;
589
1210
}
590
1211
591
memset(&to, 0, sizeof(to));
592
1212
if(af == AF_INET6){
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1213
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1214
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1215
ret = inet_pton(af, ip, &to6->sin6_addr);
595
1216
} else { /* IPv4 */
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
1217
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1218
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1219
ret = inet_pton(af, ip, &to4->sin_addr);
598
1220
}
599
1221
if(ret < 0 ){
600
perror("inet_pton");
1222
int e = errno;
1223
perror_plus("inet_pton");
1224
errno = e;
601
1225
goto mandos_end;
602
1226
}
603
1227
if(ret == 0){
604
fprintf(stderr, "Bad address: %s\n", ip);
1228
int e = errno;
1229
fprintf_plus(stderr, "Bad address: %s\n", ip);
1230
errno = e;
605
1231
goto mandos_end;
606
1232
}
607
1233
if(af == AF_INET6){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
1234
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1235
if(IN6_IS_ADDR_LINKLOCAL
1236
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
615
1237
if(if_index == AVAHI_IF_UNSPEC){
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
1238
fprintf_plus(stderr, "An IPv6 link-local address is"
1239
" incomplete without a network interface\n");
1240
errno = EINVAL;
618
1241
goto mandos_end;
619
1242
}
620
1243
/* Set the network interface number as scope */
621
to.in6.sin6_scope_id = (uint32_t)if_index;
1244
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
622
1245
}
623
1246
} else {
624
to.in.sin_port = htons(port); /* Spurious warnings from
625
-Wconversion and
626
-Wunreachable-code */
1247
((struct sockaddr_in *)&to)->sin_port = htons(port);
627
1248
}
628
1249
629
1250
if(quit_now){
1251
errno = EINTR;
630
1252
goto mandos_end;
631
1253
}
632
1254
634
1256
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
635
1257
char interface[IF_NAMESIZE];
636
1258
if(if_indextoname((unsigned int)if_index, interface) == NULL){
637
perror("if_indextoname");
1259
perror_plus("if_indextoname");
638
1260
} else {
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
1261
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1262
"\n", ip, interface, (uintmax_t)port);
641
1263
}
642
1264
} else {
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
1265
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1266
ip, (uintmax_t)port);
645
1267
}
646
1268
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
647
1269
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
648
const char *pcret;
649
if(af == AF_INET6){
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
652
} else {
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
655
}
656
if(pcret == NULL){
657
perror("inet_ntop");
658
} else {
659
if(strcmp(addrstr, ip) != 0){
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
661
}
662
}
663
}
664
665
if(quit_now){
666
goto mandos_end;
667
}
668
669
if(af == AF_INET6){
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
671
} else {
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
673
}
674
if(ret < 0){
675
perror("connect");
676
goto mandos_end;
677
}
678
679
if(quit_now){
680
goto mandos_end;
1270
if(af == AF_INET6){
1271
ret = getnameinfo((struct sockaddr *)&to,
1272
sizeof(struct sockaddr_in6),
1273
addrstr, sizeof(addrstr), NULL, 0,
1274
NI_NUMERICHOST);
1275
} else {
1276
ret = getnameinfo((struct sockaddr *)&to,
1277
sizeof(struct sockaddr_in),
1278
addrstr, sizeof(addrstr), NULL, 0,
1279
NI_NUMERICHOST);
1280
}
1281
if(ret == EAI_SYSTEM){
1282
perror_plus("getnameinfo");
1283
} else if(ret != 0) {
1284
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1285
} else if(strcmp(addrstr, ip) != 0){
1286
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1287
}
1288
}
1289
1290
if(quit_now){
1291
errno = EINTR;
1292
goto mandos_end;
1293
}
1294
1295
while(true){
1296
if(af == AF_INET6){
1297
ret = connect(tcp_sd, (struct sockaddr *)&to,
1298
sizeof(struct sockaddr_in6));
1299
} else {
1300
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1301
sizeof(struct sockaddr_in));
1302
}
1303
if(ret < 0){
1304
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1305
and if_index != AVAHI_IF_UNSPEC
1306
and connect_to == NULL
1307
and not route_added and
1308
((af == AF_INET6 and not
1309
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1310
&to)->sin6_addr)))
1311
or (af == AF_INET and
1312
/* Not a a IPv4LL address */
1313
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1314
& 0xFFFF0000L) != 0xA9FE0000L))){
1315
/* Work around Avahi bug - Avahi does not announce link-local
1316
addresses if it has a global address, so local hosts with
1317
*only* a link-local address (e.g. Mandos clients) cannot
1318
connect to a Mandos server announced by Avahi on a server
1319
host with a global address. Work around this by retrying
1320
with an explicit route added with the server's address.
1321
1322
Avahi bug reference:
1323
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1324
https://bugs.debian.org/587961
1325
*/
1326
if(debug){
1327
fprintf_plus(stderr, "Mandos server unreachable, trying"
1328
" direct route\n");
1329
}
1330
int e = errno;
1331
route_added = add_local_route(ip, if_index);
1332
if(route_added){
1333
continue;
1334
}
1335
errno = e;
1336
}
1337
if(errno != ECONNREFUSED or debug){
1338
int e = errno;
1339
perror_plus("connect");
1340
errno = e;
1341
}
1342
goto mandos_end;
1343
}
1344
1345
if(quit_now){
1346
errno = EINTR;
1347
goto mandos_end;
1348
}
1349
break;
681
1350
}
682
1351
683
1352
const char *out = mandos_protocol_version;
685
1354
while(true){
686
1355
size_t out_size = strlen(out);
687
1356
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
688
out_size - written));
1357
out_size - written));
689
1358
if(ret == -1){
690
perror("write");
1359
int e = errno;
1360
perror_plus("write");
1361
errno = e;
691
1362
goto mandos_end;
692
1363
}
693
1364
written += (size_t)ret;
703
1374
}
704
1375
705
1376
if(quit_now){
1377
errno = EINTR;
706
1378
goto mandos_end;
707
1379
}
708
1380
}
709
1381
710
1382
if(debug){
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1383
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
712
1384
}
713
1385
714
1386
if(quit_now){
1387
errno = EINTR;
715
1388
goto mandos_end;
716
1389
}
717
1390
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1391
/* This casting via intptr_t is to eliminate warning about casting
1392
an int to a pointer type. This is exactly how the GnuTLS Guile
1393
function "set-session-transport-fd!" does it. */
1394
gnutls_transport_set_ptr(session,
1395
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
719
1396
720
1397
if(quit_now){
1398
errno = EINTR;
721
1399
goto mandos_end;
722
1400
}
723
1401
724
1402
do {
725
1403
ret = gnutls_handshake(session);
726
1404
if(quit_now){
1405
errno = EINTR;
727
1406
goto mandos_end;
728
1407
}
729
1408
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
1409
731
1410
if(ret != GNUTLS_E_SUCCESS){
732
1411
if(debug){
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1412
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
734
1413
gnutls_perror(ret);
735
1414
}
1415
errno = EPROTO;
736
1416
goto mandos_end;
737
1417
}
738
1418
739
1419
/* Read OpenPGP packet that contains the wanted password */
740
1420
741
1421
if(debug){
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
1422
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1423
" %s\n", ip);
744
1424
}
745
1425
746
1426
while(true){
747
1427
748
1428
if(quit_now){
1429
errno = EINTR;
749
1430
goto mandos_end;
750
1431
}
751
1432
752
1433
buffer_capacity = incbuffer(&buffer, buffer_length,
753
buffer_capacity);
1434
buffer_capacity);
754
1435
if(buffer_capacity == 0){
755
perror("incbuffer");
1436
int e = errno;
1437
perror_plus("incbuffer");
1438
errno = e;
756
1439
goto mandos_end;
757
1440
}
758
1441
759
1442
if(quit_now){
1443
errno = EINTR;
760
1444
goto mandos_end;
761
1445
}
762
1446
775
1459
ret = gnutls_handshake(session);
776
1460
777
1461
if(quit_now){
1462
errno = EINTR;
778
1463
goto mandos_end;
779
1464
}
780
1465
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
781
1466
if(ret < 0){
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1467
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1468
"***\n");
783
1469
gnutls_perror(ret);
1470
errno = EPROTO;
784
1471
goto mandos_end;
785
1472
}
786
1473
break;
787
1474
default:
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
1475
fprintf_plus(stderr, "Unknown error while reading data from"
1476
" encrypted session with Mandos server\n");
790
1477
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1478
errno = EIO;
791
1479
goto mandos_end;
792
1480
}
793
1481
} else {
796
1484
}
797
1485
798
1486
if(debug){
799
fprintf(stderr, "Closing TLS session\n");
1487
fprintf_plus(stderr, "Closing TLS session\n");
800
1488
}
801
1489
802
1490
if(quit_now){
1491
errno = EINTR;
803
1492
goto mandos_end;
804
1493
}
805
1494
806
1495
do {
807
1496
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
1497
if(quit_now){
1498
errno = EINTR;
809
1499
goto mandos_end;
810
1500
}
811
1501
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
1502
813
1503
if(buffer_length > 0){
814
1504
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
817
&decrypted_buffer);
1505
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1506
&decrypted_buffer, mc);
818
1507
if(decrypted_buffer_size >= 0){
819
1508
1509
clearerr(stdout);
820
1510
written = 0;
821
1511
while(written < (size_t) decrypted_buffer_size){
822
1512
if(quit_now){
1513
errno = EINTR;
823
1514
goto mandos_end;
824
1515
}
825
1516
827
1518
(size_t)decrypted_buffer_size - written,
828
1519
stdout);
829
1520
if(ret == 0 and ferror(stdout)){
1521
int e = errno;
830
1522
if(debug){
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
1523
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1524
strerror(errno));
833
1525
}
1526
errno = e;
834
1527
goto mandos_end;
835
1528
}
836
1529
written += (size_t)ret;
837
1530
}
1531
ret = fflush(stdout);
1532
if(ret != 0){
1533
int e = errno;
1534
if(debug){
1535
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1536
strerror(errno));
1537
}
1538
errno = e;
1539
goto mandos_end;
1540
}
838
1541
retval = 0;
839
1542
}
840
1543
}
842
1545
/* Shutdown procedure */
843
1546
844
1547
mandos_end:
845
free(decrypted_buffer);
846
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
850
if(ret == -1){
851
perror("close");
852
}
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
1548
{
1549
if(route_added){
1550
if(not delete_local_route(ip, if_index)){
1551
fprintf_plus(stderr, "Failed to delete local route to %s on"
1552
" interface %d", ip, if_index);
1553
}
1554
}
1555
int e = errno;
1556
free(decrypted_buffer);
1557
free(buffer);
1558
if(tcp_sd >= 0){
1559
ret = close(tcp_sd);
1560
}
1561
if(ret == -1){
1562
if(e == 0){
1563
e = errno;
1564
}
1565
perror_plus("close");
1566
}
1567
gnutls_deinit(session);
1568
errno = e;
1569
if(quit_now){
1570
errno = EINTR;
1571
retval = -1;
1572
}
856
1573
}
857
1574
return retval;
858
1575
}
870
1587
AVAHI_GCC_UNUSED AvahiStringList *txt,
871
1588
AVAHI_GCC_UNUSED AvahiLookupResultFlags
872
1589
flags,
873
AVAHI_GCC_UNUSED void* userdata){
874
assert(r);
1590
void *mc){
1591
if(r == NULL){
1592
return;
1593
}
875
1594
876
1595
/* Called whenever a service has been resolved successfully or
877
1596
timed out */
878
1597
879
1598
if(quit_now){
1599
avahi_s_service_resolver_free(r);
880
1600
return;
881
1601
}
882
1602
883
1603
switch(event){
884
1604
default:
885
1605
case AVAHI_RESOLVER_FAILURE:
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1606
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1607
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1608
domain,
1609
avahi_strerror(avahi_server_errno
1610
(((mandos_context*)mc)->server)));
889
1611
break;
890
1612
891
1613
case AVAHI_RESOLVER_FOUND:
893
1615
char ip[AVAHI_ADDRESS_STR_MAX];
894
1616
avahi_address_snprint(ip, sizeof(ip), address);
895
1617
if(debug){
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1618
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1619
PRIdMAX ") on port %" PRIu16 "\n", name,
1620
host_name, ip, (intmax_t)interface, port);
899
1621
}
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
1622
int ret = start_mandos_communication(ip, (in_port_t)port,
1623
interface,
1624
avahi_proto_to_af(proto),
1625
mc);
902
1626
if(ret == 0){
903
avahi_simple_poll_quit(mc.simple_poll);
1627
avahi_simple_poll_quit(simple_poll);
1628
} else {
1629
if(not add_server(ip, (in_port_t)port, interface,
1630
avahi_proto_to_af(proto),
1631
&((mandos_context*)mc)->current_server)){
1632
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1633
" list\n", name);
1634
}
904
1635
}
905
1636
}
906
1637
}
916
1647
const char *domain,
917
1648
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1649
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(b);
1650
void *mc){
1651
if(b == NULL){
1652
return;
1653
}
921
1654
922
1655
/* Called whenever a new services becomes available on the LAN or
923
1656
is removed from the LAN */
930
1663
default:
931
1664
case AVAHI_BROWSER_FAILURE:
932
1665
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
1666
fprintf_plus(stderr, "(Avahi browser) %s\n",
1667
avahi_strerror(avahi_server_errno
1668
(((mandos_context*)mc)->server)));
1669
avahi_simple_poll_quit(simple_poll);
936
1670
return;
937
1671
938
1672
case AVAHI_BROWSER_NEW:
941
1675
the callback function is called the Avahi server will free the
942
1676
resolver for us. */
943
1677
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1678
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1679
interface, protocol, name, type,
1680
domain, protocol, 0,
1681
resolve_callback, mc) == NULL)
1682
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1683
" %s\n", name,
1684
avahi_strerror(avahi_server_errno
1685
(((mandos_context*)mc)->server)));
949
1686
break;
950
1687
951
1688
case AVAHI_BROWSER_REMOVE:
954
1691
case AVAHI_BROWSER_ALL_FOR_NOW:
955
1692
case AVAHI_BROWSER_CACHE_EXHAUSTED:
956
1693
if(debug){
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1694
fprintf_plus(stderr, "No Mandos server found, still"
1695
" searching...\n");
958
1696
}
959
1697
break;
960
1698
}
961
1699
}
962
1700
963
/* stop main loop after sigterm has been called */
1701
/* Signal handler that stops main loop after SIGTERM */
964
1702
static void handle_sigterm(int sig){
965
1703
if(quit_now){
966
1704
return;
968
1706
quit_now = 1;
969
1707
signal_received = sig;
970
1708
int old_errno = errno;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
1709
/* set main loop to exit */
1710
if(simple_poll != NULL){
1711
avahi_simple_poll_quit(simple_poll);
1712
}
1713
errno = old_errno;
1714
}
1715
1716
__attribute__((nonnull, warn_unused_result))
1717
bool get_flags(const char *ifname, struct ifreq *ifr){
1718
int ret;
1719
int old_errno;
1720
1721
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1722
if(s < 0){
1723
old_errno = errno;
1724
perror_plus("socket");
1725
errno = old_errno;
1726
return false;
1727
}
1728
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1729
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1730
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1731
if(ret == -1){
1732
if(debug){
1733
old_errno = errno;
1734
perror_plus("ioctl SIOCGIFFLAGS");
1735
errno = old_errno;
1736
}
1737
if((close(s) == -1) and debug){
1738
old_errno = errno;
1739
perror_plus("close");
1740
errno = old_errno;
1741
}
1742
return false;
1743
}
1744
if((close(s) == -1) and debug){
1745
old_errno = errno;
1746
perror_plus("close");
1747
errno = old_errno;
1748
}
1749
return true;
1750
}
1751
1752
__attribute__((nonnull, warn_unused_result))
1753
bool good_flags(const char *ifname, const struct ifreq *ifr){
1754
1755
/* Reject the loopback device */
1756
if(ifr->ifr_flags & IFF_LOOPBACK){
1757
if(debug){
1758
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1759
ifname);
1760
}
1761
return false;
1762
}
1763
/* Accept point-to-point devices only if connect_to is specified */
1764
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1765
if(debug){
1766
fprintf_plus(stderr, "Accepting point-to-point interface"
1767
" \"%s\"\n", ifname);
1768
}
1769
return true;
1770
}
1771
/* Otherwise, reject non-broadcast-capable devices */
1772
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1773
if(debug){
1774
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1775
" \"%s\"\n", ifname);
1776
}
1777
return false;
1778
}
1779
/* Reject non-ARP interfaces (including dummy interfaces) */
1780
if(ifr->ifr_flags & IFF_NOARP){
1781
if(debug){
1782
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1783
ifname);
1784
}
1785
return false;
1786
}
1787
1788
/* Accept this device */
1789
if(debug){
1790
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1791
}
1792
return true;
1793
}
1794
1795
/*
1796
* This function determines if a directory entry in /sys/class/net
1797
* corresponds to an acceptable network device.
1798
* (This function is passed to scandir(3) as a filter function.)
1799
*/
1800
__attribute__((nonnull, warn_unused_result))
1801
int good_interface(const struct dirent *if_entry){
1802
if(if_entry->d_name[0] == '.'){
1803
return 0;
1804
}
1805
1806
struct ifreq ifr;
1807
if(not get_flags(if_entry->d_name, &ifr)){
1808
if(debug){
1809
fprintf_plus(stderr, "Failed to get flags for interface "
1810
"\"%s\"\n", if_entry->d_name);
1811
}
1812
return 0;
1813
}
1814
1815
if(not good_flags(if_entry->d_name, &ifr)){
1816
return 0;
1817
}
1818
return 1;
1819
}
1820
1821
/*
1822
* This function determines if a network interface is up.
1823
*/
1824
__attribute__((nonnull, warn_unused_result))
1825
bool interface_is_up(const char *interface){
1826
struct ifreq ifr;
1827
if(not get_flags(interface, &ifr)){
1828
if(debug){
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
}
1832
return false;
1833
}
1834
1835
return (bool)(ifr.ifr_flags & IFF_UP);
1836
}
1837
1838
/*
1839
* This function determines if a network interface is running
1840
*/
1841
__attribute__((nonnull, warn_unused_result))
1842
bool interface_is_running(const char *interface){
1843
struct ifreq ifr;
1844
if(not get_flags(interface, &ifr)){
1845
if(debug){
1846
fprintf_plus(stderr, "Failed to get flags for interface "
1847
"\"%s\"\n", interface);
1848
}
1849
return false;
1850
}
1851
1852
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1853
}
1854
1855
__attribute__((nonnull, pure, warn_unused_result))
1856
int notdotentries(const struct dirent *direntry){
1857
/* Skip "." and ".." */
1858
if(direntry->d_name[0] == '.'
1859
and (direntry->d_name[1] == '\0'
1860
or (direntry->d_name[1] == '.'
1861
and direntry->d_name[2] == '\0'))){
1862
return 0;
1863
}
1864
return 1;
1865
}
1866
1867
/* Is this directory entry a runnable program? */
1868
__attribute__((nonnull, warn_unused_result))
1869
int runnable_hook(const struct dirent *direntry){
1870
int ret;
1871
size_t sret;
1872
struct stat st;
1873
1874
if((direntry->d_name)[0] == '\0'){
1875
/* Empty name? */
1876
return 0;
1877
}
1878
1879
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1880
"abcdefghijklmnopqrstuvwxyz"
1881
"0123456789"
1882
"_.-");
1883
if((direntry->d_name)[sret] != '\0'){
1884
/* Contains non-allowed characters */
1885
if(debug){
1886
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1887
direntry->d_name);
1888
}
1889
return 0;
1890
}
1891
1892
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1893
if(ret == -1){
1894
if(debug){
1895
perror_plus("Could not stat hook");
1896
}
1897
return 0;
1898
}
1899
if(not (S_ISREG(st.st_mode))){
1900
/* Not a regular file */
1901
if(debug){
1902
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1903
direntry->d_name);
1904
}
1905
return 0;
1906
}
1907
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1908
/* Not executable */
1909
if(debug){
1910
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1911
direntry->d_name);
1912
}
1913
return 0;
1914
}
1915
if(debug){
1916
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1917
direntry->d_name);
1918
}
1919
return 1;
1920
}
1921
1922
__attribute__((nonnull, warn_unused_result))
1923
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1924
mandos_context *mc){
1925
int ret;
1926
struct timespec now;
1927
struct timespec waited_time;
1928
intmax_t block_time;
1929
1930
while(true){
1931
if(mc->current_server == NULL){
1932
if(debug){
1933
fprintf_plus(stderr, "Wait until first server is found."
1934
" No timeout!\n");
1935
}
1936
ret = avahi_simple_poll_iterate(s, -1);
1937
} else {
1938
if(debug){
1939
fprintf_plus(stderr, "Check current_server if we should run"
1940
" it, or wait\n");
1941
}
1942
/* the current time */
1943
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1944
if(ret == -1){
1945
perror_plus("clock_gettime");
1946
return -1;
1947
}
1948
/* Calculating in ms how long time between now and server
1949
who we visted longest time ago. Now - last seen. */
1950
waited_time.tv_sec = (now.tv_sec
1951
- mc->current_server->last_seen.tv_sec);
1952
waited_time.tv_nsec = (now.tv_nsec
1953
- mc->current_server->last_seen.tv_nsec);
1954
/* total time is 10s/10,000ms.
1955
Converting to s from ms by dividing by 1,000,
1956
and ns to ms by dividing by 1,000,000. */
1957
block_time = ((retry_interval
1958
- ((intmax_t)waited_time.tv_sec * 1000))
1959
- ((intmax_t)waited_time.tv_nsec / 1000000));
1960
1961
if(debug){
1962
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1963
block_time);
1964
}
1965
1966
if(block_time <= 0){
1967
ret = start_mandos_communication(mc->current_server->ip,
1968
mc->current_server->port,
1969
mc->current_server->if_index,
1970
mc->current_server->af, mc);
1971
if(ret == 0){
1972
avahi_simple_poll_quit(s);
1973
return 0;
1974
}
1975
ret = clock_gettime(CLOCK_MONOTONIC,
1976
&mc->current_server->last_seen);
1977
if(ret == -1){
1978
perror_plus("clock_gettime");
1979
return -1;
1980
}
1981
mc->current_server = mc->current_server->next;
1982
block_time = 0; /* Call avahi to find new Mandos
1983
servers, but don't block */
1984
}
1985
1986
ret = avahi_simple_poll_iterate(s, (int)block_time);
1987
}
1988
if(ret != 0){
1989
if(ret > 0 or errno != EINTR){
1990
return (ret != 1) ? ret : 0;
1991
}
1992
}
1993
}
1994
}
1995
1996
__attribute__((nonnull))
1997
void run_network_hooks(const char *mode, const char *interface,
1998
const float delay){
1999
struct dirent **direntries = NULL;
2000
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2002
| O_CLOEXEC);
2003
if(hookdir_fd == -1){
2004
if(errno == ENOENT){
2005
if(debug){
2006
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2007
" found\n", hookdir);
2008
}
2009
} else {
2010
perror_plus("open");
2011
}
2012
return;
2013
}
2014
}
2015
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2016
if(devnull == -1){
2017
perror_plus("open(\"/dev/null\", O_RDONLY)");
2018
return;
2019
}
2020
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
runnable_hook, alphasort);
2022
if(numhooks == -1){
2023
perror_plus("scandir");
2024
close(devnull);
2025
return;
2026
}
2027
struct dirent *direntry;
2028
int ret;
2029
for(int i = 0; i < numhooks; i++){
2030
direntry = direntries[i];
2031
if(debug){
2032
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2033
direntry->d_name);
2034
}
2035
pid_t hook_pid = fork();
2036
if(hook_pid == 0){
2037
/* Child */
2038
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2040
if(errno != 0){
2041
perror_plus("Failed to raise privileges");
2042
_exit(EX_NOPERM);
2043
}
2044
/* Set group */
2045
errno = 0;
2046
ret = setgid(0);
2047
if(ret == -1){
2048
perror_plus("setgid");
2049
_exit(EX_NOPERM);
2050
}
2051
/* Reset supplementary groups */
2052
errno = 0;
2053
ret = setgroups(0, NULL);
2054
if(ret == -1){
2055
perror_plus("setgroups");
2056
_exit(EX_NOPERM);
2057
}
2058
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2059
if(ret == -1){
2060
perror_plus("setenv");
2061
_exit(EX_OSERR);
2062
}
2063
ret = setenv("DEVICE", interface, 1);
2064
if(ret == -1){
2065
perror_plus("setenv");
2066
_exit(EX_OSERR);
2067
}
2068
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2069
if(ret == -1){
2070
perror_plus("setenv");
2071
_exit(EX_OSERR);
2072
}
2073
ret = setenv("MODE", mode, 1);
2074
if(ret == -1){
2075
perror_plus("setenv");
2076
_exit(EX_OSERR);
2077
}
2078
char *delaystring;
2079
ret = asprintf(&delaystring, "%f", (double)delay);
2080
if(ret == -1){
2081
perror_plus("asprintf");
2082
_exit(EX_OSERR);
2083
}
2084
ret = setenv("DELAY", delaystring, 1);
2085
if(ret == -1){
2086
free(delaystring);
2087
perror_plus("setenv");
2088
_exit(EX_OSERR);
2089
}
2090
free(delaystring);
2091
if(connect_to != NULL){
2092
ret = setenv("CONNECT", connect_to, 1);
2093
if(ret == -1){
2094
perror_plus("setenv");
2095
_exit(EX_OSERR);
2096
}
2097
}
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2099
direntry->d_name,
2100
O_RDONLY));
2101
if(hook_fd == -1){
2102
perror_plus("openat");
2103
_exit(EXIT_FAILURE);
2104
}
2105
if(close(hookdir_fd) == -1){
2106
perror_plus("close");
2107
_exit(EXIT_FAILURE);
2108
}
2109
ret = dup2(devnull, STDIN_FILENO);
2110
if(ret == -1){
2111
perror_plus("dup2(devnull, STDIN_FILENO)");
2112
_exit(EX_OSERR);
2113
}
2114
ret = close(devnull);
2115
if(ret == -1){
2116
perror_plus("close");
2117
_exit(EX_OSERR);
2118
}
2119
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2120
if(ret == -1){
2121
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2122
_exit(EX_OSERR);
2123
}
2124
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2125
environ) == -1){
2126
perror_plus("fexecve");
2127
_exit(EXIT_FAILURE);
2128
}
2129
} else {
2130
if(hook_pid == -1){
2131
perror_plus("fork");
2132
free(direntry);
2133
continue;
2134
}
2135
int status;
2136
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
perror_plus("waitpid");
2138
free(direntry);
2139
continue;
2140
}
2141
if(WIFEXITED(status)){
2142
if(WEXITSTATUS(status) != 0){
2143
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
" with status %d\n", direntry->d_name,
2145
WEXITSTATUS(status));
2146
free(direntry);
2147
continue;
2148
}
2149
} else if(WIFSIGNALED(status)){
2150
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
" signal %d\n", direntry->d_name,
2152
WTERMSIG(status));
2153
free(direntry);
2154
continue;
2155
} else {
2156
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
" crashed\n", direntry->d_name);
2158
free(direntry);
2159
continue;
2160
}
2161
}
2162
if(debug){
2163
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2164
direntry->d_name);
2165
}
2166
free(direntry);
2167
}
2168
free(direntries);
2169
if(close(hookdir_fd) == -1){
2170
perror_plus("close");
2171
} else {
2172
hookdir_fd = -1;
2173
}
2174
close(devnull);
2175
}
2176
2177
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2179
const float delay){
2180
int old_errno = errno;
2181
int ret;
2182
struct ifreq network;
2183
unsigned int if_index = if_nametoindex(interface);
2184
if(if_index == 0){
2185
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2186
errno = old_errno;
2187
return ENXIO;
2188
}
2189
2190
if(quit_now){
2191
errno = old_errno;
2192
return EINTR;
2193
}
2194
2195
if(not interface_is_up(interface)){
2196
int ret_errno = 0;
2197
int ioctl_errno = 0;
2198
if(not get_flags(interface, &network)){
2199
ret_errno = errno;
2200
fprintf_plus(stderr, "Failed to get flags for interface "
2201
"\"%s\"\n", interface);
2202
errno = old_errno;
2203
return ret_errno;
2204
}
2205
network.ifr_flags |= IFF_UP; /* set flag */
2206
2207
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2208
if(sd == -1){
2209
ret_errno = errno;
2210
perror_plus("socket");
2211
errno = old_errno;
2212
return ret_errno;
2213
}
2214
2215
if(quit_now){
2216
ret = close(sd);
2217
if(ret == -1){
2218
perror_plus("close");
2219
}
2220
errno = old_errno;
2221
return EINTR;
2222
}
2223
2224
if(debug){
2225
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2226
interface);
2227
}
2228
2229
/* Raise privileges */
2230
ret_errno = raise_privileges();
2231
if(ret_errno != 0){
2232
errno = ret_errno;
2233
perror_plus("Failed to raise privileges");
2234
}
2235
2236
#ifdef __linux__
2237
int ret_linux;
2238
bool restore_loglevel = false;
2239
if(ret_errno == 0){
2240
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2241
messages about the network interface to mess up the prompt */
2242
ret_linux = klogctl(8, NULL, 5);
2243
if(ret_linux == -1){
2244
perror_plus("klogctl");
2245
} else {
2246
restore_loglevel = true;
2247
}
2248
}
2249
#endif /* __linux__ */
2250
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2251
ioctl_errno = errno;
2252
#ifdef __linux__
2253
if(restore_loglevel){
2254
ret_linux = klogctl(7, NULL, 0);
2255
if(ret_linux == -1){
2256
perror_plus("klogctl");
2257
}
2258
}
2259
#endif /* __linux__ */
2260
2261
/* If raise_privileges() succeeded above */
2262
if(ret_errno == 0){
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("Failed to lower privileges");
2268
}
2269
}
2270
2271
/* Close the socket */
2272
ret = close(sd);
2273
if(ret == -1){
2274
perror_plus("close");
2275
}
2276
2277
if(ret_setflags == -1){
2278
errno = ioctl_errno;
2279
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2280
errno = old_errno;
2281
return ioctl_errno;
2282
}
2283
} else if(debug){
2284
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2285
interface);
2286
}
2287
2288
/* Sleep checking until interface is running.
2289
Check every 0.25s, up to total time of delay */
2290
for(int i = 0; i < delay * 4; i++){
2291
if(interface_is_running(interface)){
2292
break;
2293
}
2294
struct timespec sleeptime = { .tv_nsec = 250000000 };
2295
ret = nanosleep(&sleeptime, NULL);
2296
if(ret == -1 and errno != EINTR){
2297
perror_plus("nanosleep");
2298
}
2299
}
2300
2301
errno = old_errno;
2302
return 0;
2303
}
2304
2305
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
2308
struct ifreq network;
2309
unsigned int if_index = if_nametoindex(interface);
2310
if(if_index == 0){
2311
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2312
errno = old_errno;
2313
return ENXIO;
2314
}
2315
if(interface_is_up(interface)){
2316
int ret_errno = 0;
2317
int ioctl_errno = 0;
2318
if(not get_flags(interface, &network) and debug){
2319
ret_errno = errno;
2320
fprintf_plus(stderr, "Failed to get flags for interface "
2321
"\"%s\"\n", interface);
2322
errno = old_errno;
2323
return ret_errno;
2324
}
2325
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2326
2327
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2328
if(sd == -1){
2329
ret_errno = errno;
2330
perror_plus("socket");
2331
errno = old_errno;
2332
return ret_errno;
2333
}
2334
2335
if(debug){
2336
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2337
interface);
2338
}
2339
2340
/* Raise privileges */
2341
ret_errno = raise_privileges();
2342
if(ret_errno != 0){
2343
errno = ret_errno;
2344
perror_plus("Failed to raise privileges");
2345
}
2346
2347
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2348
ioctl_errno = errno;
2349
2350
/* If raise_privileges() succeeded above */
2351
if(ret_errno == 0){
2352
/* Lower privileges */
2353
ret_errno = lower_privileges();
2354
if(ret_errno != 0){
2355
errno = ret_errno;
2356
perror_plus("Failed to lower privileges");
2357
}
2358
}
2359
2360
/* Close the socket */
2361
int ret = close(sd);
2362
if(ret == -1){
2363
perror_plus("close");
2364
}
2365
2366
if(ret_setflags == -1){
2367
errno = ioctl_errno;
2368
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2369
errno = old_errno;
2370
return ioctl_errno;
2371
}
2372
} else if(debug){
2373
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2374
interface);
2375
}
2376
2377
errno = old_errno;
2378
return 0;
975
2379
}
976
2380
977
2381
int main(int argc, char *argv[]){
2382
mandos_context mc = { .server = NULL, .dh_bits = 0,
2383
.priority = "SECURE256:!CTYPE-X.509"
2384
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2385
.current_server = NULL, .interfaces = NULL,
2386
.interfaces_size = 0 };
978
2387
AvahiSServiceBrowser *sb = NULL;
979
int error;
2388
error_t ret_errno;
980
2389
int ret;
981
2390
intmax_t tmpmax;
982
2391
char *tmp;
983
2392
int exitcode = EXIT_SUCCESS;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
991
char tempdir[] = "/tmp/mandosXXXXXX";
992
bool tempdir_created = false;
2393
char *interfaces_to_take_down = NULL;
2394
size_t interfaces_to_take_down_size = 0;
2395
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2396
char old_tempdir[] = "/tmp/mandosXXXXXX";
2397
char *tempdir = NULL;
993
2398
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
2399
const char *seckey = PATHDIR "/" SECKEY;
995
2400
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
2402
char *interfaces_hooks = NULL;
996
2403
997
2404
bool gnutls_initialized = false;
998
2405
bool gpgme_initialized = false;
999
2406
float delay = 2.5f;
2407
double retry_interval = 10; /* 10s between trying a server and
2408
retrying the same server again */
1000
2409
1001
2410
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
2411
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1008
2417
errno = 0;
1009
2418
ret = setgid(gid);
1010
2419
if(ret == -1){
1011
perror("setgid");
2420
perror_plus("setgid");
1012
2421
}
1013
2422
1014
2423
/* Lower user privileges (temporarily) */
1015
2424
errno = 0;
1016
2425
ret = seteuid(uid);
1017
2426
if(ret == -1){
1018
perror("seteuid");
2427
perror_plus("seteuid");
1019
2428
}
1020
2429
1021
2430
if(quit_now){
1048
2457
.doc = "Bit length of the prime number used in the"
1049
2458
" Diffie-Hellman key exchange",
1050
2459
.group = 2 },
2460
{ .name = "dh-params", .key = 134,
2461
.arg = "FILE",
2462
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2463
" for the Diffie-Hellman key exchange",
2464
.group = 2 },
1051
2465
{ .name = "priority", .key = 130,
1052
2466
.arg = "STRING",
1053
2467
.doc = "GnuTLS priority string for the TLS handshake",
1056
2470
.arg = "SECONDS",
1057
2471
.doc = "Maximum delay to wait for interface startup",
1058
2472
.group = 2 },
2473
{ .name = "retry", .key = 132,
2474
.arg = "SECONDS",
2475
.doc = "Retry interval used when denied by the Mandos server",
2476
.group = 2 },
2477
{ .name = "network-hook-dir", .key = 133,
2478
.arg = "DIR",
2479
.doc = "Directory where network hooks are located",
2480
.group = 2 },
2481
/*
2482
* These reproduce what we would get without ARGP_NO_HELP
2483
*/
2484
{ .name = "help", .key = '?',
2485
.doc = "Give this help list", .group = -1 },
2486
{ .name = "usage", .key = -3,
2487
.doc = "Give a short usage message", .group = -1 },
2488
{ .name = "version", .key = 'V',
2489
.doc = "Print program version", .group = -1 },
1059
2490
{ .name = NULL }
1060
2491
};
1061
2492
1062
2493
error_t parse_opt(int key, char *arg,
1063
2494
struct argp_state *state){
2495
errno = 0;
1064
2496
switch(key){
1065
2497
case 128: /* --debug */
1066
2498
debug = true;
1069
2501
connect_to = arg;
1070
2502
break;
1071
2503
case 'i': /* --interface */
1072
interface = arg;
2504
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2505
arg, (int)',');
2506
if(ret_errno != 0){
2507
argp_error(state, "%s", strerror(ret_errno));
2508
}
1073
2509
break;
1074
2510
case 's': /* --seckey */
1075
2511
seckey = arg;
1082
2518
tmpmax = strtoimax(arg, &tmp, 10);
1083
2519
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
2520
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
2521
argp_error(state, "Bad number of DH bits");
1087
2522
}
1088
2523
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1089
2524
break;
2525
case 134: /* --dh-params */
2526
dh_params_file = arg;
2527
break;
1090
2528
case 130: /* --priority */
1091
2529
mc.priority = arg;
1092
2530
break;
1094
2532
errno = 0;
1095
2533
delay = strtof(arg, &tmp);
1096
2534
if(errno != 0 or tmp == arg or *tmp != '\0'){
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
2535
argp_error(state, "Bad delay");
2536
}
2537
case 132: /* --retry */
2538
errno = 0;
2539
retry_interval = strtod(arg, &tmp);
2540
if(errno != 0 or tmp == arg or *tmp != '\0'
2541
or (retry_interval * 1000) > INT_MAX
2542
or retry_interval < 0){
2543
argp_error(state, "Bad retry interval");
2544
}
2545
break;
2546
case 133: /* --network-hook-dir */
2547
hookdir = arg;
2548
break;
2549
/*
2550
* These reproduce what we would get without ARGP_NO_HELP
2551
*/
2552
case '?': /* --help */
2553
argp_state_help(state, state->out_stream,
2554
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2555
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2556
case -3: /* --usage */
2557
argp_state_help(state, state->out_stream,
2558
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2559
case 'V': /* --version */
2560
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2561
exit(argp_err_exit_status);
1104
2562
break;
1105
2563
default:
1106
2564
return ARGP_ERR_UNKNOWN;
1107
2565
}
1108
return 0;
2566
return errno;
1109
2567
}
1110
2568
1111
2569
struct argp argp = { .options = options, .parser = parse_opt,
1112
2570
.args_doc = "",
1113
2571
.doc = "Mandos client -- Get and decrypt"
1114
2572
" passwords from a Mandos server" };
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
2573
ret_errno = argp_parse(&argp, argc, argv,
2574
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2575
switch(ret_errno){
2576
case 0:
2577
break;
2578
case ENOMEM:
2579
default:
2580
errno = ret_errno;
2581
perror_plus("argp_parse");
2582
exitcode = EX_OSERR;
2583
goto end;
2584
case EINVAL:
2585
exitcode = EX_USAGE;
2586
goto end;
2587
}
2588
}
2589
2590
{
2591
/* Work around Debian bug #633582:
2592
<https://bugs.debian.org/633582> */
2593
2594
/* Re-raise privileges */
2595
ret = raise_privileges();
2596
if(ret != 0){
2597
errno = ret;
2598
perror_plus("Failed to raise privileges");
2599
} else {
2600
struct stat st;
2601
2602
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2603
int seckey_fd = open(seckey, O_RDONLY);
2604
if(seckey_fd == -1){
2605
perror_plus("open");
2606
} else {
2607
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2608
if(ret == -1){
2609
perror_plus("fstat");
2610
} else {
2611
if(S_ISREG(st.st_mode)
2612
and st.st_uid == 0 and st.st_gid == 0){
2613
ret = fchown(seckey_fd, uid, gid);
2614
if(ret == -1){
2615
perror_plus("fchown");
2616
}
2617
}
2618
}
2619
close(seckey_fd);
2620
}
2621
}
2622
2623
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2624
int pubkey_fd = open(pubkey, O_RDONLY);
2625
if(pubkey_fd == -1){
2626
perror_plus("open");
2627
} else {
2628
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2629
if(ret == -1){
2630
perror_plus("fstat");
2631
} else {
2632
if(S_ISREG(st.st_mode)
2633
and st.st_uid == 0 and st.st_gid == 0){
2634
ret = fchown(pubkey_fd, uid, gid);
2635
if(ret == -1){
2636
perror_plus("fchown");
2637
}
2638
}
2639
}
2640
close(pubkey_fd);
2641
}
2642
}
2643
2644
if(dh_params_file != NULL
2645
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2646
int dhparams_fd = open(dh_params_file, O_RDONLY);
2647
if(dhparams_fd == -1){
2648
perror_plus("open");
2649
} else {
2650
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2651
if(ret == -1){
2652
perror_plus("fstat");
2653
} else {
2654
if(S_ISREG(st.st_mode)
2655
and st.st_uid == 0 and st.st_gid == 0){
2656
ret = fchown(dhparams_fd, uid, gid);
2657
if(ret == -1){
2658
perror_plus("fchown");
2659
}
2660
}
2661
}
2662
close(dhparams_fd);
2663
}
2664
}
2665
2666
/* Lower privileges */
2667
ret = lower_privileges();
2668
if(ret != 0){
2669
errno = ret;
2670
perror_plus("Failed to lower privileges");
2671
}
2672
}
2673
}
2674
2675
/* Remove invalid interface names (except "none") */
2676
{
2677
char *interface = NULL;
2678
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2679
interface))){
2680
if(strcmp(interface, "none") != 0
2681
and if_nametoindex(interface) == 0){
2682
if(interface[0] != '\0'){
2683
fprintf_plus(stderr, "Not using nonexisting interface"
2684
" \"%s\"\n", interface);
2685
}
2686
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2687
interface = NULL;
2688
}
2689
}
2690
}
2691
2692
/* Run network hooks */
2693
{
2694
if(mc.interfaces != NULL){
2695
interfaces_hooks = malloc(mc.interfaces_size);
2696
if(interfaces_hooks == NULL){
2697
perror_plus("malloc");
2698
goto end;
2699
}
2700
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2701
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2702
}
2703
run_network_hooks("start", interfaces_hooks != NULL ?
2704
interfaces_hooks : "", delay);
1121
2705
}
1122
2706
1123
2707
if(not debug){
1128
2712
from the signal handler */
1129
2713
/* Initialize the pseudo-RNG for Avahi */
1130
2714
srand((unsigned int) time(NULL));
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2715
simple_poll = avahi_simple_poll_new();
2716
if(simple_poll == NULL){
2717
fprintf_plus(stderr,
2718
"Avahi: Failed to create simple poll object.\n");
2719
exitcode = EX_UNAVAILABLE;
1135
2720
goto end;
1136
2721
}
1137
2722
1138
2723
sigemptyset(&sigterm_action.sa_mask);
1139
2724
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
2725
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2726
perror_plus("sigaddset");
2727
exitcode = EX_OSERR;
1143
2728
goto end;
1144
2729
}
1145
2730
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
2731
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2732
perror_plus("sigaddset");
2733
exitcode = EX_OSERR;
1149
2734
goto end;
1150
2735
}
1151
2736
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
2737
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2738
perror_plus("sigaddset");
2739
exitcode = EX_OSERR;
1155
2740
goto end;
1156
2741
}
1157
2742
/* Need to check if the handler is SIG_IGN before handling:
1160
2745
*/
1161
2746
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
2747
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2748
perror_plus("sigaction");
2749
return EX_OSERR;
1165
2750
}
1166
2751
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
2752
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
2753
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2754
perror_plus("sigaction");
2755
exitcode = EX_OSERR;
1171
2756
goto end;
1172
2757
}
1173
2758
}
1174
2759
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
2760
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2761
perror_plus("sigaction");
2762
return EX_OSERR;
1178
2763
}
1179
2764
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
2765
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
2766
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2767
perror_plus("sigaction");
2768
exitcode = EX_OSERR;
1184
2769
goto end;
1185
2770
}
1186
2771
}
1187
2772
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
2773
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2774
perror_plus("sigaction");
2775
return EX_OSERR;
1191
2776
}
1192
2777
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
2778
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
2779
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
}
1200
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
2780
perror_plus("sigaction");
2781
exitcode = EX_OSERR;
2782
goto end;
2783
}
2784
}
2785
2786
/* If no interfaces were specified, make a list */
2787
if(mc.interfaces == NULL){
2788
struct dirent **direntries = NULL;
2789
/* Look for any good interfaces */
2790
ret = scandir(sys_class_net, &direntries, good_interface,
2791
alphasort);
2792
if(ret >= 1){
2793
/* Add all found interfaces to interfaces list */
2794
for(int i = 0; i < ret; ++i){
2795
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2796
direntries[i]->d_name);
2797
if(ret_errno != 0){
2798
errno = ret_errno;
2799
perror_plus("argz_add");
2800
free(direntries[i]);
2801
continue;
2802
}
2803
if(debug){
2804
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2805
direntries[i]->d_name);
2806
}
2807
free(direntries[i]);
2808
}
2809
free(direntries);
2810
} else {
2811
if(ret == 0){
2812
free(direntries);
2813
}
2814
fprintf_plus(stderr, "Could not find a network interface\n");
2815
exitcode = EXIT_FAILURE;
2816
goto end;
2817
}
2818
}
2819
2820
/* Bring up interfaces which are down, and remove any "none"s */
2821
{
2822
char *interface = NULL;
2823
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2824
interface))){
2825
/* If interface name is "none", stop bringing up interfaces.
2826
Also remove all instances of "none" from the list */
2827
if(strcmp(interface, "none") == 0){
2828
argz_delete(&mc.interfaces, &mc.interfaces_size,
2829
interface);
2830
interface = NULL;
2831
while((interface = argz_next(mc.interfaces,
2832
mc.interfaces_size, interface))){
2833
if(strcmp(interface, "none") == 0){
2834
argz_delete(&mc.interfaces, &mc.interfaces_size,
2835
interface);
2836
interface = NULL;
1286
2837
}
1287
2838
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
2839
break;
1305
2840
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
1336
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
2841
bool interface_was_up = interface_is_up(interface);
2842
errno = bring_up_interface(interface, delay);
2843
if(not interface_was_up){
2844
if(errno != 0){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2847
} else {
2848
errno = argz_add(&interfaces_to_take_down,
2849
&interfaces_to_take_down_size,
2850
interface);
2851
if(errno != 0){
2852
perror_plus("argz_add");
2853
}
2854
}
2855
}
2856
}
2857
if(debug and (interfaces_to_take_down == NULL)){
2858
fprintf_plus(stderr, "No interfaces were brought up\n");
2859
}
2860
}
2861
2862
/* If we only got one interface, explicitly use only that one */
2863
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2864
if(debug){
2865
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2866
mc.interfaces);
2867
}
2868
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1343
2869
}
1344
2870
1345
2871
if(quit_now){
1346
2872
goto end;
1347
2873
}
1348
2874
1349
ret = init_gnutls_global(pubkey, seckey);
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1350
2876
if(ret == -1){
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2877
fprintf_plus(stderr, "init_gnutls_global failed\n");
2878
exitcode = EX_UNAVAILABLE;
1353
2879
goto end;
1354
2880
} else {
1355
2881
gnutls_initialized = true;
1359
2885
goto end;
1360
2886
}
1361
2887
1362
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
2888
/* Try /run/tmp before /tmp */
2889
tempdir = mkdtemp(run_tempdir);
2890
if(tempdir == NULL and errno == ENOENT){
2891
if(debug){
2892
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2893
run_tempdir, old_tempdir);
2894
}
2895
tempdir = mkdtemp(old_tempdir);
2896
}
2897
if(tempdir == NULL){
2898
perror_plus("mkdtemp");
1366
2899
goto end;
1367
2900
}
1368
2901
1370
2903
goto end;
1371
2904
}
1372
2905
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2906
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2907
fprintf_plus(stderr, "init_gpgme failed\n");
2908
exitcode = EX_UNAVAILABLE;
1376
2909
goto end;
1377
2910
} else {
1378
2911
gpgme_initialized = true;
1386
2919
/* Connect directly, do not use Zeroconf */
1387
2920
/* (Mainly meant for debugging) */
1388
2921
char *address = strrchr(connect_to, ':');
2922
1389
2923
if(address == NULL){
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2924
fprintf_plus(stderr, "No colon in address\n");
2925
exitcode = EX_USAGE;
1392
2926
goto end;
1393
2927
}
1394
2928
1396
2930
goto end;
1397
2931
}
1398
2932
1399
uint16_t port;
2933
in_port_t port;
1400
2934
errno = 0;
1401
2935
tmpmax = strtoimax(address+1, &tmp, 10);
1402
2936
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2937
or tmpmax != (in_port_t)tmpmax){
2938
fprintf_plus(stderr, "Bad port number\n");
2939
exitcode = EX_USAGE;
1406
2940
goto end;
1407
2941
}
1408
2942
1409
2943
if(quit_now){
1410
2944
goto end;
1411
2945
}
1412
2946
1413
port = (uint16_t)tmpmax;
2947
port = (in_port_t)tmpmax;
1414
2948
*address = '\0';
1415
address = connect_to;
1416
2949
/* Colon in address indicates IPv6 */
1417
2950
int af;
1418
if(strchr(address, ':') != NULL){
2951
if(strchr(connect_to, ':') != NULL){
1419
2952
af = AF_INET6;
2953
/* Accept [] around IPv6 address - see RFC 5952 */
2954
if(connect_to[0] == '[' and address[-1] == ']')
2955
{
2956
connect_to++;
2957
address[-1] = '\0';
2958
}
1420
2959
} else {
1421
2960
af = AF_INET;
1422
2961
}
2962
address = connect_to;
1423
2963
1424
2964
if(quit_now){
1425
2965
goto end;
1426
2966
}
1427
2967
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2968
while(not quit_now){
2969
ret = start_mandos_communication(address, port, if_index, af,
2970
&mc);
2971
if(quit_now or ret == 0){
2972
break;
2973
}
2974
if(debug){
2975
fprintf_plus(stderr, "Retrying in %d seconds\n",
2976
(int)retry_interval);
2977
}
2978
sleep((unsigned int)retry_interval);
2979
}
2980
2981
if(not quit_now){
1432
2982
exitcode = EXIT_SUCCESS;
1433
2983
}
2984
1434
2985
goto end;
1435
2986
}
1436
2987
1448
2999
config.publish_domain = 0;
1449
3000
1450
3001
/* Allocate a new server */
1451
mc.server = avahi_server_new(avahi_simple_poll_get
1452
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
3002
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3003
&config, NULL, NULL, &ret);
1454
3004
1455
3005
/* Free the Avahi configuration data */
1456
3006
avahi_server_config_free(&config);
1458
3008
1459
3009
/* Check if creating the Avahi server object succeeded */
1460
3010
if(mc.server == NULL){
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
3011
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3012
avahi_strerror(ret));
3013
exitcode = EX_UNAVAILABLE;
1464
3014
goto end;
1465
3015
}
1466
3016
1471
3021
/* Create the Avahi service browser */
1472
3022
sb = avahi_s_service_browser_new(mc.server, if_index,
1473
3023
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
NULL, 0, browse_callback, NULL);
3024
NULL, 0, browse_callback,
3025
(void *)&mc);
1475
3026
if(sb == NULL){
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
3027
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3028
avahi_strerror(avahi_server_errno(mc.server)));
3029
exitcode = EX_UNAVAILABLE;
1479
3030
goto end;
1480
3031
}
1481
3032
1486
3037
/* Run the main loop */
1487
3038
1488
3039
if(debug){
1489
fprintf(stderr, "Starting Avahi loop search\n");
3040
fprintf_plus(stderr, "Starting Avahi loop search\n");
1490
3041
}
1491
3042
1492
avahi_simple_poll_loop(mc.simple_poll);
3043
ret = avahi_loop_with_timeout(simple_poll,
3044
(int)(retry_interval * 1000), &mc);
3045
if(debug){
3046
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3047
(ret == 0) ? "successfully" : "with error");
3048
}
1493
3049
1494
3050
end:
1495
3051
1496
3052
if(debug){
1497
fprintf(stderr, "%s exiting\n", argv[0]);
3053
if(signal_received){
3054
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3055
argv[0], signal_received,
3056
strsignal(signal_received));
3057
} else {
3058
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3059
}
1498
3060
}
1499
3061
1500
3062
/* Cleanup things */
3063
free(mc.interfaces);
3064
1501
3065
if(sb != NULL)
1502
3066
avahi_s_service_browser_free(sb);
1503
3067
1504
3068
if(mc.server != NULL)
1505
3069
avahi_server_free(mc.server);
1506
3070
1507
if(mc.simple_poll != NULL)
1508
avahi_simple_poll_free(mc.simple_poll);
3071
if(simple_poll != NULL)
3072
avahi_simple_poll_free(simple_poll);
1509
3073
1510
3074
if(gnutls_initialized){
1511
3075
gnutls_certificate_free_credentials(mc.cred);
1512
gnutls_global_deinit();
1513
3076
gnutls_dh_params_deinit(mc.dh_params);
1514
3077
}
1515
3078
1517
3080
gpgme_release(mc.ctx);
1518
3081
}
1519
3082
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
1549
}
1550
}
1551
1552
/* Removes the temp directory used by GPGME */
1553
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
1574
char *fullname = NULL;
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
direntry->d_name);
1577
if(ret < 0){
1578
perror("asprintf");
1579
continue;
1580
}
1581
ret = remove(fullname);
1582
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
1585
}
1586
free(fullname);
1587
}
1588
closedir(d);
1589
}
1590
ret = rmdir(tempdir);
1591
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
1593
}
3083
/* Cleans up the circular linked list of Mandos servers the client
3084
has seen */
3085
if(mc.current_server != NULL){
3086
mc.current_server->prev->next = NULL;
3087
while(mc.current_server != NULL){
3088
server *next = mc.current_server->next;
3089
#ifdef __GNUC__
3090
#pragma GCC diagnostic push
3091
#pragma GCC diagnostic ignored "-Wcast-qual"
3092
#endif
3093
free((char *)(mc.current_server->ip));
3094
#ifdef __GNUC__
3095
#pragma GCC diagnostic pop
3096
#endif
3097
free(mc.current_server);
3098
mc.current_server = next;
3099
}
3100
}
3101
3102
/* Re-raise privileges */
3103
{
3104
ret = raise_privileges();
3105
if(ret != 0){
3106
errno = ret;
3107
perror_plus("Failed to raise privileges");
3108
} else {
3109
3110
/* Run network hooks */
3111
run_network_hooks("stop", interfaces_hooks != NULL ?
3112
interfaces_hooks : "", delay);
3113
3114
/* Take down the network interfaces which were brought up */
3115
{
3116
char *interface = NULL;
3117
while((interface = argz_next(interfaces_to_take_down,
3118
interfaces_to_take_down_size,
3119
interface))){
3120
ret = take_down_interface(interface);
3121
if(ret != 0){
3122
errno = ret;
3123
perror_plus("Failed to take down interface");
3124
}
3125
}
3126
if(debug and (interfaces_to_take_down == NULL)){
3127
fprintf_plus(stderr, "No interfaces needed to be taken"
3128
" down\n");
3129
}
3130
}
3131
}
3132
3133
ret = lower_privileges_permanently();
3134
if(ret != 0){
3135
errno = ret;
3136
perror_plus("Failed to lower privileges permanently");
3137
}
3138
}
3139
3140
free(interfaces_to_take_down);
3141
free(interfaces_hooks);
3142
3143
void clean_dir_at(int base, const char * const dirname,
3144
uintmax_t level){
3145
struct dirent **direntries = NULL;
3146
int dret;
3147
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3148
O_RDONLY
3149
| O_NOFOLLOW
3150
| O_DIRECTORY
3151
| O_PATH));
3152
if(dir_fd == -1){
3153
perror_plus("open");
3154
return;
3155
}
3156
int numentries = scandirat(dir_fd, ".", &direntries,
3157
notdotentries, alphasort);
3158
if(numentries >= 0){
3159
for(int i = 0; i < numentries; i++){
3160
if(debug){
3161
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3162
dirname, direntries[i]->d_name);
3163
}
3164
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3165
if(dret == -1){
3166
if(errno == EISDIR){
3167
dret = unlinkat(dir_fd, direntries[i]->d_name,
3168
AT_REMOVEDIR);
3169
}
3170
if((dret == -1) and (errno == ENOTEMPTY)
3171
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3172
== 0) and (level == 0)){
3173
/* Recurse only in this special case */
3174
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3175
dret = 0;
3176
}
3177
if((dret == -1) and (errno != ENOENT)){
3178
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3179
direntries[i]->d_name, strerror(errno));
3180
}
3181
}
3182
free(direntries[i]);
3183
}
3184
3185
/* need to clean even if 0 because man page doesn't specify */
3186
free(direntries);
3187
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3188
if(dret == -1 and errno != ENOENT){
3189
perror_plus("rmdir");
3190
}
3191
} else {
3192
perror_plus("scandirat");
3193
}
3194
close(dir_fd);
3195
}
3196
3197
/* Removes the GPGME temp directory and all files inside */
3198
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);
1594
3200
}
1595
3201
1596
3202
if(quit_now){
1600
3206
&old_sigterm_action,
1601
3207
NULL));
1602
3208
if(ret == -1){
1603
perror("sigaction");
3209
perror_plus("sigaction");
1604
3210
}
1605
3211
do {
1606
3212
ret = raise(signal_received);
1607
3213
} while(ret != 0 and errno == EINTR);
1608
3214
if(ret != 0){
1609
perror("raise");
3215
perror_plus("raise");
1610
3216
abort();
1611
3217
}
1612
3218
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0