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» Revision
237.7.496
(compared to revision 237.2.104)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2018-04-02 10:24:15 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 368.
- Revision ID: teddy@recompile.se-20180402102415-xrsu0wxhnmlaq29a
Minor code cleanup
* plugins.d/mandos-client.c (pgp_packet_decrypt): Use a "for"
statement instead of a "while" statement to move initialization and
stepping into the for statement, and reduce loop variable name
length.
* plugins.d/mandos-client.c (pgp_packet_decrypt): Use a "for"
statement instead of a "while" statement to move initialization and
stepping into the for statement, and reduce loop variable name
length.
- 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() */
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
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
75
SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
71
78
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
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79
*/
73
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
81
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
77
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#include <iso646.h> /* not, or, and */
78
86
#include <argp.h> /* struct argp_option, error_t, struct
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87
argp_state, struct argp,
80
88
argp_parse(), ARGP_KEY_ARG,
81
89
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
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#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
91
sigaction(), SIGTERM, sig_atomic_t,
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
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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;
181
182
sig_atomic_t quit_now = 0;
183
int signal_received = 0;
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
}
144
203
145
204
/*
146
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
206
* bytes. "buffer_capacity" is how much is currently allocated,
148
207
* "buffer_length" is how much is already used.
149
208
*/
209
__attribute__((nonnull, warn_unused_result))
150
210
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
211
size_t buffer_capacity){
152
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
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;
155
219
return 0;
156
220
}
221
*buffer = new_buf;
157
222
buffer_capacity += BUFFER_SIZE;
158
223
}
159
224
return buffer_capacity;
160
225
}
161
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
162
275
/*
163
276
* Initialize GPGME.
164
277
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
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){
168
283
gpgme_error_t rc;
169
284
gpgme_engine_info_t engine_info;
170
285
171
172
286
/*
173
287
* Helper function to insert pub and seckey to the engine keyring.
174
288
*/
175
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
290
int ret;
176
291
int fd;
177
292
gpgme_data_t pgp_data;
178
293
179
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
295
if(fd == -1){
181
perror("open");
296
perror_plus("open");
182
297
return false;
183
298
}
184
299
185
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
301
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
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));
189
304
return false;
190
305
}
191
306
192
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
193
308
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
196
311
return false;
197
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
}
198
388
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
389
ret = close(fd);
200
390
if(ret == -1){
201
perror("close");
391
perror_plus("close");
202
392
}
203
393
gpgme_data_release(pgp_data);
204
394
return true;
205
395
}
206
396
207
397
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
398
fprintf_plus(stderr, "Initializing GPGME\n");
209
399
}
210
400
211
401
/* Init GPGME */
212
402
gpgme_check_version(NULL);
213
403
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
404
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
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));
217
407
return false;
218
408
}
219
409
220
/* Set GPGME home directory for the OpenPGP engine only */
410
/* Set GPGME home directory for the OpenPGP engine only */
221
411
rc = gpgme_get_engine_info(&engine_info);
222
412
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
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));
225
415
return false;
226
416
}
227
417
while(engine_info != NULL){
233
423
engine_info = engine_info->next;
234
424
}
235
425
if(engine_info == NULL){
236
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);
237
428
return false;
238
429
}
239
430
240
431
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
432
rc = gpgme_new(&(mc->ctx));
242
433
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
245
436
return false;
246
437
}
247
438
249
440
return false;
250
441
}
251
442
252
return true;
443
return true;
253
444
}
254
445
255
446
/*
256
447
* Decrypt OpenPGP data.
257
448
* Returns -1 on error
258
449
*/
450
__attribute__((nonnull, warn_unused_result))
259
451
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
452
size_t crypto_size,
261
char **plaintext){
453
char **plaintext,
454
mandos_context *mc){
262
455
gpgme_data_t dh_crypto, dh_plain;
263
456
gpgme_error_t rc;
264
457
ssize_t ret;
266
459
ssize_t plaintext_length = 0;
267
460
268
461
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
462
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
270
463
}
271
464
272
465
/* Create new GPGME data buffer from memory cryptotext */
273
466
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
467
0);
275
468
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
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));
278
471
return -1;
279
472
}
280
473
281
474
/* Create new empty GPGME data buffer for the plaintext */
282
475
rc = gpgme_data_new(&dh_plain);
283
476
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
478
gpgme_strsource(rc), gpgme_strerror(rc));
286
479
gpgme_data_release(dh_crypto);
287
480
return -1;
288
481
}
289
482
290
483
/* Decrypt data from the cryptotext data buffer to the plaintext
291
484
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
485
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
486
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
487
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
488
gpgme_strsource(rc), gpgme_strerror(rc));
296
489
plaintext_length = -1;
297
490
if(debug){
298
491
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
492
result = gpgme_op_decrypt_result(mc->ctx);
300
493
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
494
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
302
495
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
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");
307
502
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
503
fprintf_plus(stderr, "File name: %s\n", result->file_name);
309
504
}
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
505
506
for(gpgme_recipient_t r = result->recipients; r != NULL;
507
r = r->next){
508
fprintf_plus(stderr, "Public key algorithm: %s\n",
509
gpgme_pubkey_algo_name(r->pubkey_algo));
510
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
511
fprintf_plus(stderr, "Secret key available: %s\n",
512
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
322
513
}
323
514
}
324
515
}
326
517
}
327
518
328
519
if(debug){
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
520
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
521
}
331
522
332
523
/* Seek back to the beginning of the GPGME plaintext data buffer */
333
524
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
525
perror_plus("gpgme_data_seek");
335
526
plaintext_length = -1;
336
527
goto decrypt_end;
337
528
}
339
530
*plaintext = NULL;
340
531
while(true){
341
532
plaintext_capacity = incbuffer(plaintext,
342
(size_t)plaintext_length,
343
plaintext_capacity);
533
(size_t)plaintext_length,
534
plaintext_capacity);
344
535
if(plaintext_capacity == 0){
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
536
perror_plus("incbuffer");
537
plaintext_length = -1;
538
goto decrypt_end;
348
539
}
349
540
350
541
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
355
546
break;
356
547
}
357
548
if(ret < 0){
358
perror("gpgme_data_read");
549
perror_plus("gpgme_data_read");
359
550
plaintext_length = -1;
360
551
goto decrypt_end;
361
552
}
363
554
}
364
555
365
556
if(debug){
366
fprintf(stderr, "Decrypted password is: ");
557
fprintf_plus(stderr, "Decrypted password is: ");
367
558
for(ssize_t i = 0; i < plaintext_length; i++){
368
559
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
369
560
}
380
571
return plaintext_length;
381
572
}
382
573
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
386
if(ret == NULL)
387
ret = "(unknown)";
388
return ret;
574
__attribute__((warn_unused_result, const))
575
static const char *safe_string(const char *str){
576
if(str == NULL)
577
return "(unknown)";
578
return str;
579
}
580
581
__attribute__((warn_unused_result))
582
static const char *safer_gnutls_strerror(int value){
583
const char *ret = gnutls_strerror(value);
584
return safe_string(ret);
389
585
}
390
586
391
587
/* GnuTLS log function callback */
588
__attribute__((nonnull))
392
589
static void debuggnutls(__attribute__((unused)) int level,
393
590
const char* string){
394
fprintf(stderr, "GnuTLS: %s", string);
591
fprintf_plus(stderr, "GnuTLS: %s", string);
395
592
}
396
593
594
__attribute__((nonnull(1, 2, 4), warn_unused_result))
397
595
static int init_gnutls_global(const char *pubkeyfilename,
398
const char *seckeyfilename){
596
const char *seckeyfilename,
597
const char *dhparamsfilename,
598
mandos_context *mc){
399
599
int ret;
600
unsigned int uret;
400
601
401
602
if(debug){
402
fprintf(stderr, "Initializing GnuTLS\n");
403
}
404
405
ret = gnutls_global_init();
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
409
return -1;
603
fprintf_plus(stderr, "Initializing GnuTLS\n");
410
604
}
411
605
412
606
if(debug){
418
612
}
419
613
420
614
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
615
ret = gnutls_certificate_allocate_credentials(&mc->cred);
422
616
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
428
gnutls_global_deinit();
617
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
618
safer_gnutls_strerror(ret));
429
619
return -1;
430
620
}
431
621
432
622
if(debug){
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
623
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
624
" secret key %s as GnuTLS credentials\n",
625
pubkeyfilename,
626
seckeyfilename);
436
627
}
437
628
438
629
ret = gnutls_certificate_set_openpgp_key_file
439
(mc.cred, pubkeyfilename, seckeyfilename,
630
(mc->cred, pubkeyfilename, seckeyfilename,
440
631
GNUTLS_OPENPGP_FMT_BASE64);
441
632
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
633
fprintf_plus(stderr,
634
"Error[%d] while reading the OpenPGP key pair ('%s',"
635
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
636
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
637
safer_gnutls_strerror(ret));
447
638
goto globalfail;
448
639
}
449
640
450
641
/* GnuTLS server initialization */
451
ret = gnutls_dh_params_init(&mc.dh_params);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
461
goto globalfail;
462
}
463
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
642
ret = gnutls_dh_params_init(&mc->dh_params);
643
if(ret != GNUTLS_E_SUCCESS){
644
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
645
" initialization: %s\n",
646
safer_gnutls_strerror(ret));
647
goto globalfail;
648
}
649
/* If a Diffie-Hellman parameters file was given, try to use it */
650
if(dhparamsfilename != NULL){
651
gnutls_datum_t params = { .data = NULL, .size = 0 };
652
do {
653
int dhpfile = open(dhparamsfilename, O_RDONLY);
654
if(dhpfile == -1){
655
perror_plus("open");
656
dhparamsfilename = NULL;
657
break;
658
}
659
size_t params_capacity = 0;
660
while(true){
661
params_capacity = incbuffer((char **)¶ms.data,
662
(size_t)params.size,
663
(size_t)params_capacity);
664
if(params_capacity == 0){
665
perror_plus("incbuffer");
666
free(params.data);
667
params.data = NULL;
668
dhparamsfilename = NULL;
669
break;
670
}
671
ssize_t bytes_read = read(dhpfile,
672
params.data + params.size,
673
BUFFER_SIZE);
674
/* EOF */
675
if(bytes_read == 0){
676
break;
677
}
678
/* check bytes_read for failure */
679
if(bytes_read < 0){
680
perror_plus("read");
681
free(params.data);
682
params.data = NULL;
683
dhparamsfilename = NULL;
684
break;
685
}
686
params.size += (unsigned int)bytes_read;
687
}
688
ret = close(dhpfile);
689
if(ret == -1){
690
perror_plus("close");
691
}
692
if(params.data == NULL){
693
dhparamsfilename = NULL;
694
}
695
if(dhparamsfilename == NULL){
696
break;
697
}
698
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
699
GNUTLS_X509_FMT_PEM);
700
if(ret != GNUTLS_E_SUCCESS){
701
fprintf_plus(stderr, "Failed to parse DH parameters in file"
702
" \"%s\": %s\n", dhparamsfilename,
703
safer_gnutls_strerror(ret));
704
dhparamsfilename = NULL;
705
}
706
free(params.data);
707
} while(false);
708
}
709
if(dhparamsfilename == NULL){
710
if(mc->dh_bits == 0){
711
/* Find out the optimal number of DH bits */
712
/* Try to read the private key file */
713
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
714
do {
715
int secfile = open(seckeyfilename, O_RDONLY);
716
if(secfile == -1){
717
perror_plus("open");
718
break;
719
}
720
size_t buffer_capacity = 0;
721
while(true){
722
buffer_capacity = incbuffer((char **)&buffer.data,
723
(size_t)buffer.size,
724
(size_t)buffer_capacity);
725
if(buffer_capacity == 0){
726
perror_plus("incbuffer");
727
free(buffer.data);
728
buffer.data = NULL;
729
break;
730
}
731
ssize_t bytes_read = read(secfile,
732
buffer.data + buffer.size,
733
BUFFER_SIZE);
734
/* EOF */
735
if(bytes_read == 0){
736
break;
737
}
738
/* check bytes_read for failure */
739
if(bytes_read < 0){
740
perror_plus("read");
741
free(buffer.data);
742
buffer.data = NULL;
743
break;
744
}
745
buffer.size += (unsigned int)bytes_read;
746
}
747
close(secfile);
748
} while(false);
749
/* If successful, use buffer to parse private key */
750
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
751
if(buffer.data != NULL){
752
{
753
gnutls_openpgp_privkey_t privkey = NULL;
754
ret = gnutls_openpgp_privkey_init(&privkey);
755
if(ret != GNUTLS_E_SUCCESS){
756
fprintf_plus(stderr, "Error initializing OpenPGP key"
757
" structure: %s",
758
safer_gnutls_strerror(ret));
759
free(buffer.data);
760
buffer.data = NULL;
761
} else {
762
ret = gnutls_openpgp_privkey_import
763
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
764
if(ret != GNUTLS_E_SUCCESS){
765
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
766
safer_gnutls_strerror(ret));
767
privkey = NULL;
768
}
769
free(buffer.data);
770
buffer.data = NULL;
771
if(privkey != NULL){
772
/* Use private key to suggest an appropriate
773
sec_param */
774
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
775
gnutls_openpgp_privkey_deinit(privkey);
776
if(debug){
777
fprintf_plus(stderr, "This OpenPGP key implies using"
778
" a GnuTLS security parameter \"%s\".\n",
779
safe_string(gnutls_sec_param_get_name
780
(sec_param)));
781
}
782
}
783
}
784
}
785
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
786
/* Err on the side of caution */
787
sec_param = GNUTLS_SEC_PARAM_ULTRA;
788
if(debug){
789
fprintf_plus(stderr, "Falling back to security parameter"
790
" \"%s\"\n",
791
safe_string(gnutls_sec_param_get_name
792
(sec_param)));
793
}
794
}
795
}
796
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
797
if(uret != 0){
798
mc->dh_bits = uret;
799
if(debug){
800
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
801
" implies %u DH bits; using that.\n",
802
safe_string(gnutls_sec_param_get_name
803
(sec_param)),
804
mc->dh_bits);
805
}
806
} else {
807
fprintf_plus(stderr, "Failed to get implied number of DH"
808
" bits for security parameter \"%s\"): %s\n",
809
safe_string(gnutls_sec_param_get_name
810
(sec_param)),
811
safer_gnutls_strerror(ret));
812
goto globalfail;
813
}
814
} else if(debug){
815
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
816
mc->dh_bits);
817
}
818
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
819
if(ret != GNUTLS_E_SUCCESS){
820
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
821
" bits): %s\n", mc->dh_bits,
822
safer_gnutls_strerror(ret));
823
goto globalfail;
824
}
825
}
826
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
827
466
828
return 0;
467
829
468
830
globalfail:
469
831
470
gnutls_certificate_free_credentials(mc.cred);
471
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
832
gnutls_certificate_free_credentials(mc->cred);
833
gnutls_dh_params_deinit(mc->dh_params);
473
834
return -1;
474
835
}
475
836
476
static int init_gnutls_session(gnutls_session_t *session){
837
__attribute__((nonnull, warn_unused_result))
838
static int init_gnutls_session(gnutls_session_t *session,
839
mandos_context *mc){
477
840
int ret;
478
841
/* GnuTLS session creation */
479
ret = gnutls_init(session, GNUTLS_SERVER);
842
do {
843
ret = gnutls_init(session, GNUTLS_SERVER);
844
if(quit_now){
845
return -1;
846
}
847
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
848
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
849
fprintf_plus(stderr,
850
"Error in GnuTLS session initialization: %s\n",
851
safer_gnutls_strerror(ret));
483
852
}
484
853
485
854
{
486
855
const char *err;
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
856
do {
857
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
858
if(quit_now){
859
gnutls_deinit(*session);
860
return -1;
861
}
862
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
863
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
864
fprintf_plus(stderr, "Syntax error at: %s\n", err);
865
fprintf_plus(stderr, "GnuTLS error: %s\n",
866
safer_gnutls_strerror(ret));
492
867
gnutls_deinit(*session);
493
868
return -1;
494
869
}
495
870
}
496
871
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
872
do {
873
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
874
mc->cred);
875
if(quit_now){
876
gnutls_deinit(*session);
877
return -1;
878
}
879
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
499
880
if(ret != GNUTLS_E_SUCCESS){
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
881
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
882
safer_gnutls_strerror(ret));
502
883
gnutls_deinit(*session);
503
884
return -1;
504
885
}
505
886
506
887
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
509
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
888
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
511
889
512
890
return 0;
513
891
}
516
894
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
517
895
__attribute__((unused)) const char *txt){}
518
896
897
/* Set effective uid to 0, return errno */
898
__attribute__((warn_unused_result))
899
int raise_privileges(void){
900
int old_errno = errno;
901
int ret = 0;
902
if(seteuid(0) == -1){
903
ret = errno;
904
}
905
errno = old_errno;
906
return ret;
907
}
908
909
/* Set effective and real user ID to 0. Return errno. */
910
__attribute__((warn_unused_result))
911
int raise_privileges_permanently(void){
912
int old_errno = errno;
913
int ret = raise_privileges();
914
if(ret != 0){
915
errno = old_errno;
916
return ret;
917
}
918
if(setuid(0) == -1){
919
ret = errno;
920
}
921
errno = old_errno;
922
return ret;
923
}
924
925
/* Set effective user ID to unprivileged saved user ID */
926
__attribute__((warn_unused_result))
927
int lower_privileges(void){
928
int old_errno = errno;
929
int ret = 0;
930
if(seteuid(uid) == -1){
931
ret = errno;
932
}
933
errno = old_errno;
934
return ret;
935
}
936
937
/* Lower privileges permanently */
938
__attribute__((warn_unused_result))
939
int lower_privileges_permanently(void){
940
int old_errno = errno;
941
int ret = 0;
942
if(setuid(uid) == -1){
943
ret = errno;
944
}
945
errno = old_errno;
946
return ret;
947
}
948
949
/* Helper function to add_local_route() and delete_local_route() */
950
__attribute__((nonnull, warn_unused_result))
951
static bool add_delete_local_route(const bool add,
952
const char *address,
953
AvahiIfIndex if_index){
954
int ret;
955
char helper[] = "mandos-client-iprouteadddel";
956
char add_arg[] = "add";
957
char delete_arg[] = "delete";
958
char debug_flag[] = "--debug";
959
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
960
if(pluginhelperdir == NULL){
961
if(debug){
962
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
963
" variable not set; cannot run helper\n");
964
}
965
return false;
966
}
967
968
char interface[IF_NAMESIZE];
969
if(if_indextoname((unsigned int)if_index, interface) == NULL){
970
perror_plus("if_indextoname");
971
return false;
972
}
973
974
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
975
if(devnull == -1){
976
perror_plus("open(\"/dev/null\", O_RDONLY)");
977
return false;
978
}
979
pid_t pid = fork();
980
if(pid == 0){
981
/* Child */
982
/* Raise privileges */
983
errno = raise_privileges_permanently();
984
if(errno != 0){
985
perror_plus("Failed to raise privileges");
986
/* _exit(EX_NOPERM); */
987
} else {
988
/* Set group */
989
errno = 0;
990
ret = setgid(0);
991
if(ret == -1){
992
perror_plus("setgid");
993
_exit(EX_NOPERM);
994
}
995
/* Reset supplementary groups */
996
errno = 0;
997
ret = setgroups(0, NULL);
998
if(ret == -1){
999
perror_plus("setgroups");
1000
_exit(EX_NOPERM);
1001
}
1002
}
1003
ret = dup2(devnull, STDIN_FILENO);
1004
if(ret == -1){
1005
perror_plus("dup2(devnull, STDIN_FILENO)");
1006
_exit(EX_OSERR);
1007
}
1008
ret = close(devnull);
1009
if(ret == -1){
1010
perror_plus("close");
1011
_exit(EX_OSERR);
1012
}
1013
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1014
if(ret == -1){
1015
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1016
_exit(EX_OSERR);
1017
}
1018
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1019
O_RDONLY
1020
| O_DIRECTORY
1021
| O_PATH
1022
| O_CLOEXEC));
1023
if(helperdir_fd == -1){
1024
perror_plus("open");
1025
_exit(EX_UNAVAILABLE);
1026
}
1027
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1028
helper, O_RDONLY));
1029
if(helper_fd == -1){
1030
perror_plus("openat");
1031
close(helperdir_fd);
1032
_exit(EX_UNAVAILABLE);
1033
}
1034
close(helperdir_fd);
1035
#ifdef __GNUC__
1036
#pragma GCC diagnostic push
1037
#pragma GCC diagnostic ignored "-Wcast-qual"
1038
#endif
1039
if(fexecve(helper_fd, (char *const [])
1040
{ helper, add ? add_arg : delete_arg, (char *)address,
1041
interface, debug ? debug_flag : NULL, NULL },
1042
environ) == -1){
1043
#ifdef __GNUC__
1044
#pragma GCC diagnostic pop
1045
#endif
1046
perror_plus("fexecve");
1047
_exit(EXIT_FAILURE);
1048
}
1049
}
1050
if(pid == -1){
1051
perror_plus("fork");
1052
return false;
1053
}
1054
int status;
1055
pid_t pret = -1;
1056
errno = 0;
1057
do {
1058
pret = waitpid(pid, &status, 0);
1059
if(pret == -1 and errno == EINTR and quit_now){
1060
int errno_raising = 0;
1061
if((errno = raise_privileges()) != 0){
1062
errno_raising = errno;
1063
perror_plus("Failed to raise privileges in order to"
1064
" kill helper program");
1065
}
1066
if(kill(pid, SIGTERM) == -1){
1067
perror_plus("kill");
1068
}
1069
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1070
perror_plus("Failed to lower privileges after killing"
1071
" helper program");
1072
}
1073
return false;
1074
}
1075
} while(pret == -1 and errno == EINTR);
1076
if(pret == -1){
1077
perror_plus("waitpid");
1078
return false;
1079
}
1080
if(WIFEXITED(status)){
1081
if(WEXITSTATUS(status) != 0){
1082
fprintf_plus(stderr, "Error: iprouteadddel exited"
1083
" with status %d\n", WEXITSTATUS(status));
1084
return false;
1085
}
1086
return true;
1087
}
1088
if(WIFSIGNALED(status)){
1089
fprintf_plus(stderr, "Error: iprouteadddel died by"
1090
" signal %d\n", WTERMSIG(status));
1091
return false;
1092
}
1093
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1094
return false;
1095
}
1096
1097
__attribute__((nonnull, warn_unused_result))
1098
static bool add_local_route(const char *address,
1099
AvahiIfIndex if_index){
1100
if(debug){
1101
fprintf_plus(stderr, "Adding route to %s\n", address);
1102
}
1103
return add_delete_local_route(true, address, if_index);
1104
}
1105
1106
__attribute__((nonnull, warn_unused_result))
1107
static bool delete_local_route(const char *address,
1108
AvahiIfIndex if_index){
1109
if(debug){
1110
fprintf_plus(stderr, "Removing route to %s\n", address);
1111
}
1112
return add_delete_local_route(false, address, if_index);
1113
}
1114
519
1115
/* Called when a Mandos server is found */
520
static int start_mandos_communication(const char *ip, uint16_t port,
1116
__attribute__((nonnull, warn_unused_result))
1117
static int start_mandos_communication(const char *ip, in_port_t port,
521
1118
AvahiIfIndex if_index,
522
int af){
523
int ret, tcp_sd;
1119
int af, mandos_context *mc){
1120
int ret, tcp_sd = -1;
524
1121
ssize_t sret;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
1122
struct sockaddr_storage to;
529
1123
char *buffer = NULL;
530
char *decrypted_buffer;
1124
char *decrypted_buffer = NULL;
531
1125
size_t buffer_length = 0;
532
1126
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
534
1127
size_t written;
535
int retval = 0;
1128
int retval = -1;
536
1129
gnutls_session_t session;
537
1130
int pf; /* Protocol family */
1131
bool route_added = false;
1132
1133
errno = 0;
1134
1135
if(quit_now){
1136
errno = EINTR;
1137
return -1;
1138
}
538
1139
539
1140
switch(af){
540
1141
case AF_INET6:
544
1145
pf = PF_INET;
545
1146
break;
546
1147
default:
547
fprintf(stderr, "Bad address family: %d\n", af);
1148
fprintf_plus(stderr, "Bad address family: %d\n", af);
1149
errno = EINVAL;
548
1150
return -1;
549
1151
}
550
1152
551
ret = init_gnutls_session(&session);
1153
/* If the interface is specified and we have a list of interfaces */
1154
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1155
/* Check if the interface is one of the interfaces we are using */
1156
bool match = false;
1157
{
1158
char *interface = NULL;
1159
while((interface = argz_next(mc->interfaces,
1160
mc->interfaces_size,
1161
interface))){
1162
if(if_nametoindex(interface) == (unsigned int)if_index){
1163
match = true;
1164
break;
1165
}
1166
}
1167
}
1168
if(not match){
1169
/* This interface does not match any in the list, so we don't
1170
connect to the server */
1171
if(debug){
1172
char interface[IF_NAMESIZE];
1173
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1174
perror_plus("if_indextoname");
1175
} else {
1176
fprintf_plus(stderr, "Skipping server on non-used interface"
1177
" \"%s\"\n",
1178
if_indextoname((unsigned int)if_index,
1179
interface));
1180
}
1181
}
1182
return -1;
1183
}
1184
}
1185
1186
ret = init_gnutls_session(&session, mc);
552
1187
if(ret != 0){
553
1188
return -1;
554
1189
}
555
1190
556
1191
if(debug){
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
1192
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1193
PRIuMAX "\n", ip, (uintmax_t)port);
559
1194
}
560
1195
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
1196
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
562
1197
if(tcp_sd < 0){
563
perror("socket");
564
return -1;
565
}
566
567
memset(&to, 0, sizeof(to));
1198
int e = errno;
1199
perror_plus("socket");
1200
errno = e;
1201
goto mandos_end;
1202
}
1203
1204
if(quit_now){
1205
errno = EINTR;
1206
goto mandos_end;
1207
}
1208
568
1209
if(af == AF_INET6){
569
to.in6.sin6_family = (sa_family_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1210
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1211
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1212
ret = inet_pton(af, ip, &to6->sin6_addr);
571
1213
} else { /* IPv4 */
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
1214
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1215
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1216
ret = inet_pton(af, ip, &to4->sin_addr);
574
1217
}
575
1218
if(ret < 0 ){
576
perror("inet_pton");
577
return -1;
1219
int e = errno;
1220
perror_plus("inet_pton");
1221
errno = e;
1222
goto mandos_end;
578
1223
}
579
1224
if(ret == 0){
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
1225
int e = errno;
1226
fprintf_plus(stderr, "Bad address: %s\n", ip);
1227
errno = e;
1228
goto mandos_end;
582
1229
}
583
1230
if(af == AF_INET6){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
1231
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1232
if(IN6_IS_ADDR_LINKLOCAL
1233
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
591
1234
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
1235
fprintf_plus(stderr, "An IPv6 link-local address is"
1236
" incomplete without a network interface\n");
1237
errno = EINVAL;
1238
goto mandos_end;
595
1239
}
596
1240
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
1241
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
598
1242
}
599
1243
} else {
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
1244
((struct sockaddr_in *)&to)->sin_port = htons(port);
1245
}
1246
1247
if(quit_now){
1248
errno = EINTR;
1249
goto mandos_end;
603
1250
}
604
1251
605
1252
if(debug){
606
1253
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
1254
char interface[IF_NAMESIZE];
608
1255
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
1256
perror_plus("if_indextoname");
610
1257
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
1258
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1259
"\n", ip, interface, (uintmax_t)port);
613
1260
}
614
1261
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
1262
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1263
ip, (uintmax_t)port);
617
1264
}
618
1265
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
1266
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
620
const char *pcret;
621
if(af == AF_INET6){
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
sizeof(addrstr));
624
} else {
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
626
sizeof(addrstr));
627
}
628
if(pcret == NULL){
629
perror("inet_ntop");
630
} else {
631
if(strcmp(addrstr, ip) != 0){
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
633
}
634
}
635
}
636
637
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
}
642
if(ret < 0){
643
perror("connect");
644
return -1;
1267
if(af == AF_INET6){
1268
ret = getnameinfo((struct sockaddr *)&to,
1269
sizeof(struct sockaddr_in6),
1270
addrstr, sizeof(addrstr), NULL, 0,
1271
NI_NUMERICHOST);
1272
} else {
1273
ret = getnameinfo((struct sockaddr *)&to,
1274
sizeof(struct sockaddr_in),
1275
addrstr, sizeof(addrstr), NULL, 0,
1276
NI_NUMERICHOST);
1277
}
1278
if(ret == EAI_SYSTEM){
1279
perror_plus("getnameinfo");
1280
} else if(ret != 0) {
1281
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1282
} else if(strcmp(addrstr, ip) != 0){
1283
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1284
}
1285
}
1286
1287
if(quit_now){
1288
errno = EINTR;
1289
goto mandos_end;
1290
}
1291
1292
while(true){
1293
if(af == AF_INET6){
1294
ret = connect(tcp_sd, (struct sockaddr *)&to,
1295
sizeof(struct sockaddr_in6));
1296
} else {
1297
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1298
sizeof(struct sockaddr_in));
1299
}
1300
if(ret < 0){
1301
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1302
and if_index != AVAHI_IF_UNSPEC
1303
and connect_to == NULL
1304
and not route_added and
1305
((af == AF_INET6 and not
1306
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1307
&to)->sin6_addr)))
1308
or (af == AF_INET and
1309
/* Not a a IPv4LL address */
1310
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1311
& 0xFFFF0000L) != 0xA9FE0000L))){
1312
/* Work around Avahi bug - Avahi does not announce link-local
1313
addresses if it has a global address, so local hosts with
1314
*only* a link-local address (e.g. Mandos clients) cannot
1315
connect to a Mandos server announced by Avahi on a server
1316
host with a global address. Work around this by retrying
1317
with an explicit route added with the server's address.
1318
1319
Avahi bug reference:
1320
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1321
https://bugs.debian.org/587961
1322
*/
1323
if(debug){
1324
fprintf_plus(stderr, "Mandos server unreachable, trying"
1325
" direct route\n");
1326
}
1327
int e = errno;
1328
route_added = add_local_route(ip, if_index);
1329
if(route_added){
1330
continue;
1331
}
1332
errno = e;
1333
}
1334
if(errno != ECONNREFUSED or debug){
1335
int e = errno;
1336
perror_plus("connect");
1337
errno = e;
1338
}
1339
goto mandos_end;
1340
}
1341
1342
if(quit_now){
1343
errno = EINTR;
1344
goto mandos_end;
1345
}
1346
break;
645
1347
}
646
1348
647
1349
const char *out = mandos_protocol_version;
649
1351
while(true){
650
1352
size_t out_size = strlen(out);
651
1353
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
out_size - written));
1354
out_size - written));
653
1355
if(ret == -1){
654
perror("write");
655
retval = -1;
1356
int e = errno;
1357
perror_plus("write");
1358
errno = e;
656
1359
goto mandos_end;
657
1360
}
658
1361
written += (size_t)ret;
666
1369
break;
667
1370
}
668
1371
}
1372
1373
if(quit_now){
1374
errno = EINTR;
1375
goto mandos_end;
1376
}
669
1377
}
670
1378
671
1379
if(debug){
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
do{
1380
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1381
}
1382
1383
if(quit_now){
1384
errno = EINTR;
1385
goto mandos_end;
1386
}
1387
1388
/* This casting via intptr_t is to eliminate warning about casting
1389
an int to a pointer type. This is exactly how the GnuTLS Guile
1390
function "set-session-transport-fd!" does it. */
1391
gnutls_transport_set_ptr(session,
1392
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1393
1394
if(quit_now){
1395
errno = EINTR;
1396
goto mandos_end;
1397
}
1398
1399
do {
678
1400
ret = gnutls_handshake(session);
1401
if(quit_now){
1402
errno = EINTR;
1403
goto mandos_end;
1404
}
679
1405
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
1406
681
1407
if(ret != GNUTLS_E_SUCCESS){
682
1408
if(debug){
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1409
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
684
1410
gnutls_perror(ret);
685
1411
}
686
retval = -1;
1412
errno = EPROTO;
687
1413
goto mandos_end;
688
1414
}
689
1415
690
1416
/* Read OpenPGP packet that contains the wanted password */
691
1417
692
1418
if(debug){
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
1419
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1420
" %s\n", ip);
695
1421
}
696
1422
697
1423
while(true){
1424
1425
if(quit_now){
1426
errno = EINTR;
1427
goto mandos_end;
1428
}
1429
698
1430
buffer_capacity = incbuffer(&buffer, buffer_length,
699
buffer_capacity);
1431
buffer_capacity);
700
1432
if(buffer_capacity == 0){
701
perror("incbuffer");
702
retval = -1;
1433
int e = errno;
1434
perror_plus("incbuffer");
1435
errno = e;
1436
goto mandos_end;
1437
}
1438
1439
if(quit_now){
1440
errno = EINTR;
703
1441
goto mandos_end;
704
1442
}
705
1443
714
1452
case GNUTLS_E_AGAIN:
715
1453
break;
716
1454
case GNUTLS_E_REHANDSHAKE:
717
do{
1455
do {
718
1456
ret = gnutls_handshake(session);
1457
1458
if(quit_now){
1459
errno = EINTR;
1460
goto mandos_end;
1461
}
719
1462
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
1463
if(ret < 0){
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1464
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1465
"***\n");
722
1466
gnutls_perror(ret);
723
retval = -1;
1467
errno = EPROTO;
724
1468
goto mandos_end;
725
1469
}
726
1470
break;
727
1471
default:
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
1472
fprintf_plus(stderr, "Unknown error while reading data from"
1473
" encrypted session with Mandos server\n");
731
1474
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1475
errno = EIO;
732
1476
goto mandos_end;
733
1477
}
734
1478
} else {
737
1481
}
738
1482
739
1483
if(debug){
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1484
fprintf_plus(stderr, "Closing TLS session\n");
1485
}
1486
1487
if(quit_now){
1488
errno = EINTR;
1489
goto mandos_end;
1490
}
1491
1492
do {
1493
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1494
if(quit_now){
1495
errno = EINTR;
1496
goto mandos_end;
1497
}
1498
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
744
1499
745
1500
if(buffer_length > 0){
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
748
&decrypted_buffer);
1501
ssize_t decrypted_buffer_size;
1502
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1503
&decrypted_buffer, mc);
749
1504
if(decrypted_buffer_size >= 0){
1505
1506
clearerr(stdout);
750
1507
written = 0;
751
1508
while(written < (size_t) decrypted_buffer_size){
1509
if(quit_now){
1510
errno = EINTR;
1511
goto mandos_end;
1512
}
1513
752
1514
ret = (int)fwrite(decrypted_buffer + written, 1,
753
1515
(size_t)decrypted_buffer_size - written,
754
1516
stdout);
755
1517
if(ret == 0 and ferror(stdout)){
1518
int e = errno;
756
1519
if(debug){
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
1520
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1521
strerror(errno));
759
1522
}
760
retval = -1;
761
break;
1523
errno = e;
1524
goto mandos_end;
762
1525
}
763
1526
written += (size_t)ret;
764
1527
}
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
1528
ret = fflush(stdout);
1529
if(ret != 0){
1530
int e = errno;
1531
if(debug){
1532
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1533
strerror(errno));
1534
}
1535
errno = e;
1536
goto mandos_end;
1537
}
1538
retval = 0;
768
1539
}
769
} else {
770
retval = -1;
771
1540
}
772
1541
773
1542
/* Shutdown procedure */
774
1543
775
1544
mandos_end:
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
1545
{
1546
if(route_added){
1547
if(not delete_local_route(ip, if_index)){
1548
fprintf_plus(stderr, "Failed to delete local route to %s on"
1549
" interface %d", ip, if_index);
1550
}
1551
}
1552
int e = errno;
1553
free(decrypted_buffer);
1554
free(buffer);
1555
if(tcp_sd >= 0){
1556
ret = close(tcp_sd);
1557
}
1558
if(ret == -1){
1559
if(e == 0){
1560
e = errno;
1561
}
1562
perror_plus("close");
1563
}
1564
gnutls_deinit(session);
1565
errno = e;
1566
if(quit_now){
1567
errno = EINTR;
1568
retval = -1;
1569
}
780
1570
}
781
gnutls_deinit(session);
782
1571
return retval;
783
1572
}
784
1573
795
1584
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
1585
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
1586
flags,
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
1587
void *mc){
1588
if(r == NULL){
1589
return;
1590
}
800
1591
801
1592
/* Called whenever a service has been resolved successfully or
802
1593
timed out */
803
1594
1595
if(quit_now){
1596
avahi_s_service_resolver_free(r);
1597
return;
1598
}
1599
804
1600
switch(event){
805
1601
default:
806
1602
case AVAHI_RESOLVER_FAILURE:
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
1603
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1604
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1605
domain,
1606
avahi_strerror(avahi_server_errno
1607
(((mandos_context*)mc)->server)));
810
1608
break;
811
1609
812
1610
case AVAHI_RESOLVER_FOUND:
814
1612
char ip[AVAHI_ADDRESS_STR_MAX];
815
1613
avahi_address_snprint(ip, sizeof(ip), address);
816
1614
if(debug){
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
1615
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1616
PRIdMAX ") on port %" PRIu16 "\n", name,
1617
host_name, ip, (intmax_t)interface, port);
820
1618
}
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
1619
int ret = start_mandos_communication(ip, (in_port_t)port,
1620
interface,
1621
avahi_proto_to_af(proto),
1622
mc);
823
1623
if(ret == 0){
824
avahi_simple_poll_quit(mc.simple_poll);
1624
avahi_simple_poll_quit(simple_poll);
1625
} else {
1626
if(not add_server(ip, (in_port_t)port, interface,
1627
avahi_proto_to_af(proto),
1628
&((mandos_context*)mc)->current_server)){
1629
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1630
" list\n", name);
1631
}
825
1632
}
826
1633
}
827
1634
}
837
1644
const char *domain,
838
1645
AVAHI_GCC_UNUSED AvahiLookupResultFlags
839
1646
flags,
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
1647
void *mc){
1648
if(b == NULL){
1649
return;
1650
}
842
1651
843
1652
/* Called whenever a new services becomes available on the LAN or
844
1653
is removed from the LAN */
845
1654
1655
if(quit_now){
1656
return;
1657
}
1658
846
1659
switch(event){
847
1660
default:
848
1661
case AVAHI_BROWSER_FAILURE:
849
1662
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
1663
fprintf_plus(stderr, "(Avahi browser) %s\n",
1664
avahi_strerror(avahi_server_errno
1665
(((mandos_context*)mc)->server)));
1666
avahi_simple_poll_quit(simple_poll);
853
1667
return;
854
1668
855
1669
case AVAHI_BROWSER_NEW:
858
1672
the callback function is called the Avahi server will free the
859
1673
resolver for us. */
860
1674
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1675
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1676
interface, protocol, name, type,
1677
domain, protocol, 0,
1678
resolve_callback, mc) == NULL)
1679
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1680
" %s\n", name,
1681
avahi_strerror(avahi_server_errno
1682
(((mandos_context*)mc)->server)));
866
1683
break;
867
1684
868
1685
case AVAHI_BROWSER_REMOVE:
871
1688
case AVAHI_BROWSER_ALL_FOR_NOW:
872
1689
case AVAHI_BROWSER_CACHE_EXHAUSTED:
873
1690
if(debug){
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1691
fprintf_plus(stderr, "No Mandos server found, still"
1692
" searching...\n");
875
1693
}
876
1694
break;
877
1695
}
878
1696
}
879
1697
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1698
/* Signal handler that stops main loop after SIGTERM */
1699
static void handle_sigterm(int sig){
884
1700
if(quit_now){
885
1701
return;
886
1702
}
887
1703
quit_now = 1;
888
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
1704
signal_received = sig;
1705
int old_errno = errno;
1706
/* set main loop to exit */
1707
if(simple_poll != NULL){
1708
avahi_simple_poll_quit(simple_poll);
1709
}
1710
errno = old_errno;
1711
}
1712
1713
__attribute__((nonnull, warn_unused_result))
1714
bool get_flags(const char *ifname, struct ifreq *ifr){
1715
int ret;
1716
int old_errno;
1717
1718
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1719
if(s < 0){
1720
old_errno = errno;
1721
perror_plus("socket");
1722
errno = old_errno;
1723
return false;
1724
}
1725
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1726
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1727
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1728
if(ret == -1){
1729
if(debug){
1730
old_errno = errno;
1731
perror_plus("ioctl SIOCGIFFLAGS");
1732
errno = old_errno;
1733
}
1734
if((close(s) == -1) and debug){
1735
old_errno = errno;
1736
perror_plus("close");
1737
errno = old_errno;
1738
}
1739
return false;
1740
}
1741
if((close(s) == -1) and debug){
1742
old_errno = errno;
1743
perror_plus("close");
1744
errno = old_errno;
1745
}
1746
return true;
1747
}
1748
1749
__attribute__((nonnull, warn_unused_result))
1750
bool good_flags(const char *ifname, const struct ifreq *ifr){
1751
1752
/* Reject the loopback device */
1753
if(ifr->ifr_flags & IFF_LOOPBACK){
1754
if(debug){
1755
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1756
ifname);
1757
}
1758
return false;
1759
}
1760
/* Accept point-to-point devices only if connect_to is specified */
1761
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1762
if(debug){
1763
fprintf_plus(stderr, "Accepting point-to-point interface"
1764
" \"%s\"\n", ifname);
1765
}
1766
return true;
1767
}
1768
/* Otherwise, reject non-broadcast-capable devices */
1769
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1770
if(debug){
1771
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1772
" \"%s\"\n", ifname);
1773
}
1774
return false;
1775
}
1776
/* Reject non-ARP interfaces (including dummy interfaces) */
1777
if(ifr->ifr_flags & IFF_NOARP){
1778
if(debug){
1779
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1780
ifname);
1781
}
1782
return false;
1783
}
1784
1785
/* Accept this device */
1786
if(debug){
1787
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1788
}
1789
return true;
1790
}
1791
1792
/*
1793
* This function determines if a directory entry in /sys/class/net
1794
* corresponds to an acceptable network device.
1795
* (This function is passed to scandir(3) as a filter function.)
1796
*/
1797
__attribute__((nonnull, warn_unused_result))
1798
int good_interface(const struct dirent *if_entry){
1799
if(if_entry->d_name[0] == '.'){
1800
return 0;
1801
}
1802
1803
struct ifreq ifr;
1804
if(not get_flags(if_entry->d_name, &ifr)){
1805
if(debug){
1806
fprintf_plus(stderr, "Failed to get flags for interface "
1807
"\"%s\"\n", if_entry->d_name);
1808
}
1809
return 0;
1810
}
1811
1812
if(not good_flags(if_entry->d_name, &ifr)){
1813
return 0;
1814
}
1815
return 1;
1816
}
1817
1818
/*
1819
* This function determines if a network interface is up.
1820
*/
1821
__attribute__((nonnull, warn_unused_result))
1822
bool interface_is_up(const char *interface){
1823
struct ifreq ifr;
1824
if(not get_flags(interface, &ifr)){
1825
if(debug){
1826
fprintf_plus(stderr, "Failed to get flags for interface "
1827
"\"%s\"\n", interface);
1828
}
1829
return false;
1830
}
1831
1832
return (bool)(ifr.ifr_flags & IFF_UP);
1833
}
1834
1835
/*
1836
* This function determines if a network interface is running
1837
*/
1838
__attribute__((nonnull, warn_unused_result))
1839
bool interface_is_running(const char *interface){
1840
struct ifreq ifr;
1841
if(not get_flags(interface, &ifr)){
1842
if(debug){
1843
fprintf_plus(stderr, "Failed to get flags for interface "
1844
"\"%s\"\n", interface);
1845
}
1846
return false;
1847
}
1848
1849
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1850
}
1851
1852
__attribute__((nonnull, pure, warn_unused_result))
1853
int notdotentries(const struct dirent *direntry){
1854
/* Skip "." and ".." */
1855
if(direntry->d_name[0] == '.'
1856
and (direntry->d_name[1] == '\0'
1857
or (direntry->d_name[1] == '.'
1858
and direntry->d_name[2] == '\0'))){
1859
return 0;
1860
}
1861
return 1;
1862
}
1863
1864
/* Is this directory entry a runnable program? */
1865
__attribute__((nonnull, warn_unused_result))
1866
int runnable_hook(const struct dirent *direntry){
1867
int ret;
1868
size_t sret;
1869
struct stat st;
1870
1871
if((direntry->d_name)[0] == '\0'){
1872
/* Empty name? */
1873
return 0;
1874
}
1875
1876
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1877
"abcdefghijklmnopqrstuvwxyz"
1878
"0123456789"
1879
"_.-");
1880
if((direntry->d_name)[sret] != '\0'){
1881
/* Contains non-allowed characters */
1882
if(debug){
1883
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1884
direntry->d_name);
1885
}
1886
return 0;
1887
}
1888
1889
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1890
if(ret == -1){
1891
if(debug){
1892
perror_plus("Could not stat hook");
1893
}
1894
return 0;
1895
}
1896
if(not (S_ISREG(st.st_mode))){
1897
/* Not a regular file */
1898
if(debug){
1899
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1900
direntry->d_name);
1901
}
1902
return 0;
1903
}
1904
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1905
/* Not executable */
1906
if(debug){
1907
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1908
direntry->d_name);
1909
}
1910
return 0;
1911
}
1912
if(debug){
1913
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1914
direntry->d_name);
1915
}
1916
return 1;
1917
}
1918
1919
__attribute__((nonnull, warn_unused_result))
1920
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1921
mandos_context *mc){
1922
int ret;
1923
struct timespec now;
1924
struct timespec waited_time;
1925
intmax_t block_time;
1926
1927
while(true){
1928
if(mc->current_server == NULL){
1929
if(debug){
1930
fprintf_plus(stderr, "Wait until first server is found."
1931
" No timeout!\n");
1932
}
1933
ret = avahi_simple_poll_iterate(s, -1);
1934
} else {
1935
if(debug){
1936
fprintf_plus(stderr, "Check current_server if we should run"
1937
" it, or wait\n");
1938
}
1939
/* the current time */
1940
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1941
if(ret == -1){
1942
perror_plus("clock_gettime");
1943
return -1;
1944
}
1945
/* Calculating in ms how long time between now and server
1946
who we visted longest time ago. Now - last seen. */
1947
waited_time.tv_sec = (now.tv_sec
1948
- mc->current_server->last_seen.tv_sec);
1949
waited_time.tv_nsec = (now.tv_nsec
1950
- mc->current_server->last_seen.tv_nsec);
1951
/* total time is 10s/10,000ms.
1952
Converting to s from ms by dividing by 1,000,
1953
and ns to ms by dividing by 1,000,000. */
1954
block_time = ((retry_interval
1955
- ((intmax_t)waited_time.tv_sec * 1000))
1956
- ((intmax_t)waited_time.tv_nsec / 1000000));
1957
1958
if(debug){
1959
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1960
block_time);
1961
}
1962
1963
if(block_time <= 0){
1964
ret = start_mandos_communication(mc->current_server->ip,
1965
mc->current_server->port,
1966
mc->current_server->if_index,
1967
mc->current_server->af, mc);
1968
if(ret == 0){
1969
avahi_simple_poll_quit(s);
1970
return 0;
1971
}
1972
ret = clock_gettime(CLOCK_MONOTONIC,
1973
&mc->current_server->last_seen);
1974
if(ret == -1){
1975
perror_plus("clock_gettime");
1976
return -1;
1977
}
1978
mc->current_server = mc->current_server->next;
1979
block_time = 0; /* Call avahi to find new Mandos
1980
servers, but don't block */
1981
}
1982
1983
ret = avahi_simple_poll_iterate(s, (int)block_time);
1984
}
1985
if(ret != 0){
1986
if(ret > 0 or errno != EINTR){
1987
return (ret != 1) ? ret : 0;
1988
}
1989
}
1990
}
1991
}
1992
1993
__attribute__((nonnull))
1994
void run_network_hooks(const char *mode, const char *interface,
1995
const float delay){
1996
struct dirent **direntries = NULL;
1997
if(hookdir_fd == -1){
1998
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1999
| O_CLOEXEC);
2000
if(hookdir_fd == -1){
2001
if(errno == ENOENT){
2002
if(debug){
2003
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2004
" found\n", hookdir);
2005
}
2006
} else {
2007
perror_plus("open");
2008
}
2009
return;
2010
}
2011
}
2012
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2013
if(devnull == -1){
2014
perror_plus("open(\"/dev/null\", O_RDONLY)");
2015
return;
2016
}
2017
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2018
runnable_hook, alphasort);
2019
if(numhooks == -1){
2020
perror_plus("scandir");
2021
close(devnull);
2022
return;
2023
}
2024
struct dirent *direntry;
2025
int ret;
2026
for(int i = 0; i < numhooks; i++){
2027
direntry = direntries[i];
2028
if(debug){
2029
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2030
direntry->d_name);
2031
}
2032
pid_t hook_pid = fork();
2033
if(hook_pid == 0){
2034
/* Child */
2035
/* Raise privileges */
2036
errno = raise_privileges_permanently();
2037
if(errno != 0){
2038
perror_plus("Failed to raise privileges");
2039
_exit(EX_NOPERM);
2040
}
2041
/* Set group */
2042
errno = 0;
2043
ret = setgid(0);
2044
if(ret == -1){
2045
perror_plus("setgid");
2046
_exit(EX_NOPERM);
2047
}
2048
/* Reset supplementary groups */
2049
errno = 0;
2050
ret = setgroups(0, NULL);
2051
if(ret == -1){
2052
perror_plus("setgroups");
2053
_exit(EX_NOPERM);
2054
}
2055
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2056
if(ret == -1){
2057
perror_plus("setenv");
2058
_exit(EX_OSERR);
2059
}
2060
ret = setenv("DEVICE", interface, 1);
2061
if(ret == -1){
2062
perror_plus("setenv");
2063
_exit(EX_OSERR);
2064
}
2065
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2066
if(ret == -1){
2067
perror_plus("setenv");
2068
_exit(EX_OSERR);
2069
}
2070
ret = setenv("MODE", mode, 1);
2071
if(ret == -1){
2072
perror_plus("setenv");
2073
_exit(EX_OSERR);
2074
}
2075
char *delaystring;
2076
ret = asprintf(&delaystring, "%f", (double)delay);
2077
if(ret == -1){
2078
perror_plus("asprintf");
2079
_exit(EX_OSERR);
2080
}
2081
ret = setenv("DELAY", delaystring, 1);
2082
if(ret == -1){
2083
free(delaystring);
2084
perror_plus("setenv");
2085
_exit(EX_OSERR);
2086
}
2087
free(delaystring);
2088
if(connect_to != NULL){
2089
ret = setenv("CONNECT", connect_to, 1);
2090
if(ret == -1){
2091
perror_plus("setenv");
2092
_exit(EX_OSERR);
2093
}
2094
}
2095
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2096
direntry->d_name,
2097
O_RDONLY));
2098
if(hook_fd == -1){
2099
perror_plus("openat");
2100
_exit(EXIT_FAILURE);
2101
}
2102
if(close(hookdir_fd) == -1){
2103
perror_plus("close");
2104
_exit(EXIT_FAILURE);
2105
}
2106
ret = dup2(devnull, STDIN_FILENO);
2107
if(ret == -1){
2108
perror_plus("dup2(devnull, STDIN_FILENO)");
2109
_exit(EX_OSERR);
2110
}
2111
ret = close(devnull);
2112
if(ret == -1){
2113
perror_plus("close");
2114
_exit(EX_OSERR);
2115
}
2116
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2117
if(ret == -1){
2118
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2119
_exit(EX_OSERR);
2120
}
2121
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2122
environ) == -1){
2123
perror_plus("fexecve");
2124
_exit(EXIT_FAILURE);
2125
}
2126
} else {
2127
if(hook_pid == -1){
2128
perror_plus("fork");
2129
free(direntry);
2130
continue;
2131
}
2132
int status;
2133
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2134
perror_plus("waitpid");
2135
free(direntry);
2136
continue;
2137
}
2138
if(WIFEXITED(status)){
2139
if(WEXITSTATUS(status) != 0){
2140
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2141
" with status %d\n", direntry->d_name,
2142
WEXITSTATUS(status));
2143
free(direntry);
2144
continue;
2145
}
2146
} else if(WIFSIGNALED(status)){
2147
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2148
" signal %d\n", direntry->d_name,
2149
WTERMSIG(status));
2150
free(direntry);
2151
continue;
2152
} else {
2153
fprintf_plus(stderr, "Warning: network hook \"%s\""
2154
" crashed\n", direntry->d_name);
2155
free(direntry);
2156
continue;
2157
}
2158
}
2159
if(debug){
2160
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2161
direntry->d_name);
2162
}
2163
free(direntry);
2164
}
2165
free(direntries);
2166
if(close(hookdir_fd) == -1){
2167
perror_plus("close");
2168
} else {
2169
hookdir_fd = -1;
2170
}
2171
close(devnull);
2172
}
2173
2174
__attribute__((nonnull, warn_unused_result))
2175
int bring_up_interface(const char *const interface,
2176
const float delay){
2177
int old_errno = errno;
2178
int ret;
2179
struct ifreq network;
2180
unsigned int if_index = if_nametoindex(interface);
2181
if(if_index == 0){
2182
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2183
errno = old_errno;
2184
return ENXIO;
2185
}
2186
2187
if(quit_now){
2188
errno = old_errno;
2189
return EINTR;
2190
}
2191
2192
if(not interface_is_up(interface)){
2193
int ret_errno = 0;
2194
int ioctl_errno = 0;
2195
if(not get_flags(interface, &network)){
2196
ret_errno = errno;
2197
fprintf_plus(stderr, "Failed to get flags for interface "
2198
"\"%s\"\n", interface);
2199
errno = old_errno;
2200
return ret_errno;
2201
}
2202
network.ifr_flags |= IFF_UP; /* set flag */
2203
2204
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2205
if(sd == -1){
2206
ret_errno = errno;
2207
perror_plus("socket");
2208
errno = old_errno;
2209
return ret_errno;
2210
}
2211
2212
if(quit_now){
2213
ret = close(sd);
2214
if(ret == -1){
2215
perror_plus("close");
2216
}
2217
errno = old_errno;
2218
return EINTR;
2219
}
2220
2221
if(debug){
2222
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2223
interface);
2224
}
2225
2226
/* Raise privileges */
2227
ret_errno = raise_privileges();
2228
if(ret_errno != 0){
2229
errno = ret_errno;
2230
perror_plus("Failed to raise privileges");
2231
}
2232
2233
#ifdef __linux__
2234
int ret_linux;
2235
bool restore_loglevel = false;
2236
if(ret_errno == 0){
2237
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2238
messages about the network interface to mess up the prompt */
2239
ret_linux = klogctl(8, NULL, 5);
2240
if(ret_linux == -1){
2241
perror_plus("klogctl");
2242
} else {
2243
restore_loglevel = true;
2244
}
2245
}
2246
#endif /* __linux__ */
2247
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2248
ioctl_errno = errno;
2249
#ifdef __linux__
2250
if(restore_loglevel){
2251
ret_linux = klogctl(7, NULL, 0);
2252
if(ret_linux == -1){
2253
perror_plus("klogctl");
2254
}
2255
}
2256
#endif /* __linux__ */
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2282
interface);
2283
}
2284
2285
/* Sleep checking until interface is running.
2286
Check every 0.25s, up to total time of delay */
2287
for(int i = 0; i < delay * 4; i++){
2288
if(interface_is_running(interface)){
2289
break;
2290
}
2291
struct timespec sleeptime = { .tv_nsec = 250000000 };
2292
ret = nanosleep(&sleeptime, NULL);
2293
if(ret == -1 and errno != EINTR){
2294
perror_plus("nanosleep");
2295
}
2296
}
2297
2298
errno = old_errno;
2299
return 0;
2300
}
2301
2302
__attribute__((nonnull, warn_unused_result))
2303
int take_down_interface(const char *const interface){
2304
int old_errno = errno;
2305
struct ifreq network;
2306
unsigned int if_index = if_nametoindex(interface);
2307
if(if_index == 0){
2308
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2309
errno = old_errno;
2310
return ENXIO;
2311
}
2312
if(interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network) and debug){
2316
ret_errno = errno;
2317
fprintf_plus(stderr, "Failed to get flags for interface "
2318
"\"%s\"\n", interface);
2319
errno = old_errno;
2320
return ret_errno;
2321
}
2322
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2323
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
2326
ret_errno = errno;
2327
perror_plus("socket");
2328
errno = old_errno;
2329
return ret_errno;
2330
}
2331
2332
if(debug){
2333
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2334
interface);
2335
}
2336
2337
/* Raise privileges */
2338
ret_errno = raise_privileges();
2339
if(ret_errno != 0){
2340
errno = ret_errno;
2341
perror_plus("Failed to raise privileges");
2342
}
2343
2344
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2345
ioctl_errno = errno;
2346
2347
/* If raise_privileges() succeeded above */
2348
if(ret_errno == 0){
2349
/* Lower privileges */
2350
ret_errno = lower_privileges();
2351
if(ret_errno != 0){
2352
errno = ret_errno;
2353
perror_plus("Failed to lower privileges");
2354
}
2355
}
2356
2357
/* Close the socket */
2358
int ret = close(sd);
2359
if(ret == -1){
2360
perror_plus("close");
2361
}
2362
2363
if(ret_setflags == -1){
2364
errno = ioctl_errno;
2365
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2366
errno = old_errno;
2367
return ioctl_errno;
2368
}
2369
} else if(debug){
2370
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2371
interface);
2372
}
2373
2374
errno = old_errno;
2375
return 0;
893
2376
}
894
2377
895
2378
int main(int argc, char *argv[]){
2379
mandos_context mc = { .server = NULL, .dh_bits = 0,
2380
.priority = "SECURE256:!CTYPE-X.509"
2381
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2382
.current_server = NULL, .interfaces = NULL,
2383
.interfaces_size = 0 };
896
2384
AvahiSServiceBrowser *sb = NULL;
897
int error;
2385
error_t ret_errno;
898
2386
int ret;
899
2387
intmax_t tmpmax;
900
2388
char *tmp;
901
2389
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
bool tempdir_created = false;
2390
char *interfaces_to_take_down = NULL;
2391
size_t interfaces_to_take_down_size = 0;
2392
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2393
char old_tempdir[] = "/tmp/mandosXXXXXX";
2394
char *tempdir = NULL;
910
2395
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
2396
const char *seckey = PATHDIR "/" SECKEY;
912
2397
const char *pubkey = PATHDIR "/" PUBKEY;
2398
const char *dh_params_file = NULL;
2399
char *interfaces_hooks = NULL;
913
2400
914
2401
bool gnutls_initialized = false;
915
2402
bool gpgme_initialized = false;
916
2403
float delay = 2.5f;
2404
double retry_interval = 10; /* 10s between trying a server and
2405
retrying the same server again */
917
2406
918
struct sigaction old_sigterm_action;
2407
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
2408
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
2409
2410
uid = getuid();
2411
gid = getgid();
2412
2413
/* Lower any group privileges we might have, just to be safe */
2414
errno = 0;
2415
ret = setgid(gid);
2416
if(ret == -1){
2417
perror_plus("setgid");
2418
}
2419
2420
/* Lower user privileges (temporarily) */
2421
errno = 0;
2422
ret = seteuid(uid);
2423
if(ret == -1){
2424
perror_plus("seteuid");
2425
}
2426
2427
if(quit_now){
2428
goto end;
2429
}
2430
921
2431
{
922
2432
struct argp_option options[] = {
923
2433
{ .name = "debug", .key = 128,
944
2454
.doc = "Bit length of the prime number used in the"
945
2455
" Diffie-Hellman key exchange",
946
2456
.group = 2 },
2457
{ .name = "dh-params", .key = 134,
2458
.arg = "FILE",
2459
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2460
" for the Diffie-Hellman key exchange",
2461
.group = 2 },
947
2462
{ .name = "priority", .key = 130,
948
2463
.arg = "STRING",
949
2464
.doc = "GnuTLS priority string for the TLS handshake",
952
2467
.arg = "SECONDS",
953
2468
.doc = "Maximum delay to wait for interface startup",
954
2469
.group = 2 },
2470
{ .name = "retry", .key = 132,
2471
.arg = "SECONDS",
2472
.doc = "Retry interval used when denied by the Mandos server",
2473
.group = 2 },
2474
{ .name = "network-hook-dir", .key = 133,
2475
.arg = "DIR",
2476
.doc = "Directory where network hooks are located",
2477
.group = 2 },
2478
/*
2479
* These reproduce what we would get without ARGP_NO_HELP
2480
*/
2481
{ .name = "help", .key = '?',
2482
.doc = "Give this help list", .group = -1 },
2483
{ .name = "usage", .key = -3,
2484
.doc = "Give a short usage message", .group = -1 },
2485
{ .name = "version", .key = 'V',
2486
.doc = "Print program version", .group = -1 },
955
2487
{ .name = NULL }
956
2488
};
957
2489
958
2490
error_t parse_opt(int key, char *arg,
959
2491
struct argp_state *state){
2492
errno = 0;
960
2493
switch(key){
961
2494
case 128: /* --debug */
962
2495
debug = true;
965
2498
connect_to = arg;
966
2499
break;
967
2500
case 'i': /* --interface */
968
interface = arg;
2501
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2502
arg, (int)',');
2503
if(ret_errno != 0){
2504
argp_error(state, "%s", strerror(ret_errno));
2505
}
969
2506
break;
970
2507
case 's': /* --seckey */
971
2508
seckey = arg;
978
2515
tmpmax = strtoimax(arg, &tmp, 10);
979
2516
if(errno != 0 or tmp == arg or *tmp != '\0'
980
2517
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
2518
argp_error(state, "Bad number of DH bits");
983
2519
}
984
2520
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
2521
break;
2522
case 134: /* --dh-params */
2523
dh_params_file = arg;
2524
break;
986
2525
case 130: /* --priority */
987
2526
mc.priority = arg;
988
2527
break;
990
2529
errno = 0;
991
2530
delay = strtof(arg, &tmp);
992
2531
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
2532
argp_error(state, "Bad delay");
2533
}
2534
case 132: /* --retry */
2535
errno = 0;
2536
retry_interval = strtod(arg, &tmp);
2537
if(errno != 0 or tmp == arg or *tmp != '\0'
2538
or (retry_interval * 1000) > INT_MAX
2539
or retry_interval < 0){
2540
argp_error(state, "Bad retry interval");
2541
}
2542
break;
2543
case 133: /* --network-hook-dir */
2544
hookdir = arg;
2545
break;
2546
/*
2547
* These reproduce what we would get without ARGP_NO_HELP
2548
*/
2549
case '?': /* --help */
2550
argp_state_help(state, state->out_stream,
2551
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2552
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2553
case -3: /* --usage */
2554
argp_state_help(state, state->out_stream,
2555
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2556
case 'V': /* --version */
2557
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2558
exit(argp_err_exit_status);
1000
2559
break;
1001
2560
default:
1002
2561
return ARGP_ERR_UNKNOWN;
1003
2562
}
1004
return 0;
2563
return errno;
1005
2564
}
1006
2565
1007
2566
struct argp argp = { .options = options, .parser = parse_opt,
1008
2567
.args_doc = "",
1009
2568
.doc = "Mandos client -- Get and decrypt"
1010
2569
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
2570
ret_errno = argp_parse(&argp, argc, argv,
2571
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2572
switch(ret_errno){
2573
case 0:
2574
break;
2575
case ENOMEM:
2576
default:
2577
errno = ret_errno;
2578
perror_plus("argp_parse");
2579
exitcode = EX_OSERR;
2580
goto end;
2581
case EINVAL:
2582
exitcode = EX_USAGE;
2583
goto end;
2584
}
2585
}
2586
2587
{
2588
/* Work around Debian bug #633582:
2589
<https://bugs.debian.org/633582> */
2590
2591
/* Re-raise privileges */
2592
ret = raise_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to raise privileges");
2596
} else {
2597
struct stat st;
2598
2599
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2600
int seckey_fd = open(seckey, O_RDONLY);
2601
if(seckey_fd == -1){
2602
perror_plus("open");
2603
} else {
2604
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2605
if(ret == -1){
2606
perror_plus("fstat");
2607
} else {
2608
if(S_ISREG(st.st_mode)
2609
and st.st_uid == 0 and st.st_gid == 0){
2610
ret = fchown(seckey_fd, uid, gid);
2611
if(ret == -1){
2612
perror_plus("fchown");
2613
}
2614
}
2615
}
2616
close(seckey_fd);
2617
}
2618
}
2619
2620
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2621
int pubkey_fd = open(pubkey, O_RDONLY);
2622
if(pubkey_fd == -1){
2623
perror_plus("open");
2624
} else {
2625
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2626
if(ret == -1){
2627
perror_plus("fstat");
2628
} else {
2629
if(S_ISREG(st.st_mode)
2630
and st.st_uid == 0 and st.st_gid == 0){
2631
ret = fchown(pubkey_fd, uid, gid);
2632
if(ret == -1){
2633
perror_plus("fchown");
2634
}
2635
}
2636
}
2637
close(pubkey_fd);
2638
}
2639
}
2640
2641
if(dh_params_file != NULL
2642
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2643
int dhparams_fd = open(dh_params_file, O_RDONLY);
2644
if(dhparams_fd == -1){
2645
perror_plus("open");
2646
} else {
2647
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2648
if(ret == -1){
2649
perror_plus("fstat");
2650
} else {
2651
if(S_ISREG(st.st_mode)
2652
and st.st_uid == 0 and st.st_gid == 0){
2653
ret = fchown(dhparams_fd, uid, gid);
2654
if(ret == -1){
2655
perror_plus("fchown");
2656
}
2657
}
2658
}
2659
close(dhparams_fd);
2660
}
2661
}
2662
2663
/* Lower privileges */
2664
ret = lower_privileges();
2665
if(ret != 0){
2666
errno = ret;
2667
perror_plus("Failed to lower privileges");
2668
}
2669
}
2670
}
2671
2672
/* Remove invalid interface names (except "none") */
2673
{
2674
char *interface = NULL;
2675
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2676
interface))){
2677
if(strcmp(interface, "none") != 0
2678
and if_nametoindex(interface) == 0){
2679
if(interface[0] != '\0'){
2680
fprintf_plus(stderr, "Not using nonexisting interface"
2681
" \"%s\"\n", interface);
2682
}
2683
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2684
interface = NULL;
2685
}
2686
}
2687
}
2688
2689
/* Run network hooks */
2690
{
2691
if(mc.interfaces != NULL){
2692
interfaces_hooks = malloc(mc.interfaces_size);
2693
if(interfaces_hooks == NULL){
2694
perror_plus("malloc");
2695
goto end;
2696
}
2697
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2698
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2699
}
2700
run_network_hooks("start", interfaces_hooks != NULL ?
2701
interfaces_hooks : "", delay);
1017
2702
}
1018
2703
1019
2704
if(not debug){
1024
2709
from the signal handler */
1025
2710
/* Initialize the pseudo-RNG for Avahi */
1026
2711
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
2712
simple_poll = avahi_simple_poll_new();
2713
if(simple_poll == NULL){
2714
fprintf_plus(stderr,
2715
"Avahi: Failed to create simple poll object.\n");
2716
exitcode = EX_UNAVAILABLE;
1031
2717
goto end;
1032
2718
}
1033
2719
1034
2720
sigemptyset(&sigterm_action.sa_mask);
1035
2721
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
2722
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
2723
perror_plus("sigaddset");
2724
exitcode = EX_OSERR;
1039
2725
goto end;
1040
2726
}
1041
2727
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
2728
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
2729
perror_plus("sigaddset");
2730
exitcode = EX_OSERR;
1045
2731
goto end;
1046
2732
}
1047
2733
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
2734
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
2735
perror_plus("sigaddset");
2736
exitcode = EX_OSERR;
2737
goto end;
2738
}
2739
/* Need to check if the handler is SIG_IGN before handling:
2740
| [[info:libc:Initial Signal Actions]] |
2741
| [[info:libc:Basic Signal Handling]] |
2742
*/
2743
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2744
if(ret == -1){
2745
perror_plus("sigaction");
2746
return EX_OSERR;
2747
}
2748
if(old_sigterm_action.sa_handler != SIG_IGN){
2749
ret = sigaction(SIGINT, &sigterm_action, NULL);
2750
if(ret == -1){
2751
perror_plus("sigaction");
2752
exitcode = EX_OSERR;
2753
goto end;
2754
}
2755
}
2756
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2757
if(ret == -1){
2758
perror_plus("sigaction");
2759
return EX_OSERR;
2760
}
2761
if(old_sigterm_action.sa_handler != SIG_IGN){
2762
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2763
if(ret == -1){
2764
perror_plus("sigaction");
2765
exitcode = EX_OSERR;
2766
goto end;
2767
}
2768
}
2769
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2770
if(ret == -1){
2771
perror_plus("sigaction");
2772
return EX_OSERR;
2773
}
2774
if(old_sigterm_action.sa_handler != SIG_IGN){
2775
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2776
if(ret == -1){
2777
perror_plus("sigaction");
2778
exitcode = EX_OSERR;
2779
goto end;
2780
}
2781
}
2782
2783
/* If no interfaces were specified, make a list */
2784
if(mc.interfaces == NULL){
2785
struct dirent **direntries = NULL;
2786
/* Look for any good interfaces */
2787
ret = scandir(sys_class_net, &direntries, good_interface,
2788
alphasort);
2789
if(ret >= 1){
2790
/* Add all found interfaces to interfaces list */
2791
for(int i = 0; i < ret; ++i){
2792
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2793
direntries[i]->d_name);
2794
if(ret_errno != 0){
2795
errno = ret_errno;
2796
perror_plus("argz_add");
2797
free(direntries[i]);
2798
continue;
2799
}
2800
if(debug){
2801
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2802
direntries[i]->d_name);
2803
}
2804
free(direntries[i]);
2805
}
2806
free(direntries);
2807
} else {
2808
if(ret == 0){
2809
free(direntries);
2810
}
2811
fprintf_plus(stderr, "Could not find a network interface\n");
2812
exitcode = EXIT_FAILURE;
2813
goto end;
2814
}
2815
}
2816
2817
/* Bring up interfaces which are down, and remove any "none"s */
2818
{
2819
char *interface = NULL;
2820
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2821
interface))){
2822
/* If interface name is "none", stop bringing up interfaces.
2823
Also remove all instances of "none" from the list */
2824
if(strcmp(interface, "none") == 0){
2825
argz_delete(&mc.interfaces, &mc.interfaces_size,
2826
interface);
2827
interface = NULL;
2828
while((interface = argz_next(mc.interfaces,
2829
mc.interfaces_size, interface))){
2830
if(strcmp(interface, "none") == 0){
2831
argz_delete(&mc.interfaces, &mc.interfaces_size,
2832
interface);
2833
interface = NULL;
1113
2834
}
1114
2835
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
2836
break;
1126
2837
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2838
bool interface_was_up = interface_is_up(interface);
2839
errno = bring_up_interface(interface, delay);
2840
if(not interface_was_up){
2841
if(errno != 0){
2842
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2843
" %s\n", interface, strerror(errno));
2844
} else {
2845
errno = argz_add(&interfaces_to_take_down,
2846
&interfaces_to_take_down_size,
2847
interface);
2848
if(errno != 0){
2849
perror_plus("argz_add");
2850
}
2851
}
2852
}
2853
}
2854
if(debug and (interfaces_to_take_down == NULL)){
2855
fprintf_plus(stderr, "No interfaces were brought up\n");
2856
}
2857
}
2858
2859
/* If we only got one interface, explicitly use only that one */
2860
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2861
if(debug){
2862
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2863
mc.interfaces);
2864
}
2865
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2866
}
2867
2868
if(quit_now){
2869
goto end;
2870
}
2871
2872
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2873
if(ret == -1){
2874
fprintf_plus(stderr, "init_gnutls_global failed\n");
2875
exitcode = EX_UNAVAILABLE;
1166
2876
goto end;
1167
2877
} else {
1168
2878
gnutls_initialized = true;
1169
2879
}
1170
2880
1171
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1173
goto end;
1174
}
1175
tempdir_created = true;
1176
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2881
if(quit_now){
2882
goto end;
2883
}
2884
2885
/* Try /run/tmp before /tmp */
2886
tempdir = mkdtemp(run_tempdir);
2887
if(tempdir == NULL and errno == ENOENT){
2888
if(debug){
2889
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2890
run_tempdir, old_tempdir);
2891
}
2892
tempdir = mkdtemp(old_tempdir);
2893
}
2894
if(tempdir == NULL){
2895
perror_plus("mkdtemp");
2896
goto end;
2897
}
2898
2899
if(quit_now){
2900
goto end;
2901
}
2902
2903
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2904
fprintf_plus(stderr, "init_gpgme failed\n");
2905
exitcode = EX_UNAVAILABLE;
1180
2906
goto end;
1181
2907
} else {
1182
2908
gpgme_initialized = true;
1183
2909
}
1184
2910
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2911
if(quit_now){
2912
goto end;
1192
2913
}
1193
2914
1194
2915
if(connect_to != NULL){
1195
2916
/* Connect directly, do not use Zeroconf */
1196
2917
/* (Mainly meant for debugging) */
1197
2918
char *address = strrchr(connect_to, ':');
2919
1198
2920
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
2921
fprintf_plus(stderr, "No colon in address\n");
2922
exitcode = EX_USAGE;
2923
goto end;
2924
}
2925
2926
if(quit_now){
2927
goto end;
2928
}
2929
2930
in_port_t port;
1204
2931
errno = 0;
1205
2932
tmpmax = strtoimax(address+1, &tmp, 10);
1206
2933
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
2934
or tmpmax != (in_port_t)tmpmax){
2935
fprintf_plus(stderr, "Bad port number\n");
2936
exitcode = EX_USAGE;
2937
goto end;
2938
}
2939
2940
if(quit_now){
2941
goto end;
2942
}
2943
2944
port = (in_port_t)tmpmax;
1213
2945
*address = '\0';
1214
address = connect_to;
1215
2946
/* Colon in address indicates IPv6 */
1216
2947
int af;
1217
if(strchr(address, ':') != NULL){
2948
if(strchr(connect_to, ':') != NULL){
1218
2949
af = AF_INET6;
2950
/* Accept [] around IPv6 address - see RFC 5952 */
2951
if(connect_to[0] == '[' and address[-1] == ']')
2952
{
2953
connect_to++;
2954
address[-1] = '\0';
2955
}
1219
2956
} else {
1220
2957
af = AF_INET;
1221
2958
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2959
address = connect_to;
2960
2961
if(quit_now){
2962
goto end;
2963
}
2964
2965
while(not quit_now){
2966
ret = start_mandos_communication(address, port, if_index, af,
2967
&mc);
2968
if(quit_now or ret == 0){
2969
break;
2970
}
2971
if(debug){
2972
fprintf_plus(stderr, "Retrying in %d seconds\n",
2973
(int)retry_interval);
2974
}
2975
sleep((unsigned int)retry_interval);
2976
}
2977
2978
if(not quit_now){
1226
2979
exitcode = EXIT_SUCCESS;
1227
2980
}
1228
goto end;
1229
}
1230
2981
2982
goto end;
2983
}
2984
2985
if(quit_now){
2986
goto end;
2987
}
2988
1231
2989
{
1232
2990
AvahiServerConfig config;
1233
2991
/* Do not publish any local Zeroconf records */
1238
2996
config.publish_domain = 0;
1239
2997
1240
2998
/* Allocate a new server */
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
2999
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3000
&config, NULL, NULL, &ret);
1244
3001
1245
3002
/* Free the Avahi configuration data */
1246
3003
avahi_server_config_free(&config);
1248
3005
1249
3006
/* Check if creating the Avahi server object succeeded */
1250
3007
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
3008
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3009
avahi_strerror(ret));
3010
exitcode = EX_UNAVAILABLE;
3011
goto end;
3012
}
3013
3014
if(quit_now){
1254
3015
goto end;
1255
3016
}
1256
3017
1257
3018
/* Create the Avahi service browser */
1258
3019
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
3020
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
3021
NULL, 0, browse_callback,
3022
(void *)&mc);
1261
3023
if(sb == NULL){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
3024
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3025
avahi_strerror(avahi_server_errno(mc.server)));
3026
exitcode = EX_UNAVAILABLE;
3027
goto end;
3028
}
3029
3030
if(quit_now){
1265
3031
goto end;
1266
3032
}
1267
3033
1268
3034
/* Run the main loop */
1269
3035
1270
3036
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
3037
fprintf_plus(stderr, "Starting Avahi loop search\n");
1272
3038
}
1273
3039
1274
avahi_simple_poll_loop(mc.simple_poll);
3040
ret = avahi_loop_with_timeout(simple_poll,
3041
(int)(retry_interval * 1000), &mc);
3042
if(debug){
3043
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3044
(ret == 0) ? "successfully" : "with error");
3045
}
1275
3046
1276
3047
end:
1277
3048
1278
3049
if(debug){
1279
fprintf(stderr, "%s exiting\n", argv[0]);
3050
if(signal_received){
3051
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3052
argv[0], signal_received,
3053
strsignal(signal_received));
3054
} else {
3055
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3056
}
1280
3057
}
1281
3058
1282
3059
/* Cleanup things */
3060
free(mc.interfaces);
3061
1283
3062
if(sb != NULL)
1284
3063
avahi_s_service_browser_free(sb);
1285
3064
1286
3065
if(mc.server != NULL)
1287
3066
avahi_server_free(mc.server);
1288
3067
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
3068
if(simple_poll != NULL)
3069
avahi_simple_poll_free(simple_poll);
1291
3070
1292
3071
if(gnutls_initialized){
1293
3072
gnutls_certificate_free_credentials(mc.cred);
1294
gnutls_global_deinit();
1295
3073
gnutls_dh_params_deinit(mc.dh_params);
1296
3074
}
1297
3075
1299
3077
gpgme_release(mc.ctx);
1300
3078
}
1301
3079
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
direntry->d_name);
1327
if(ret < 0){
1328
perror("asprintf");
1329
continue;
1330
}
1331
ret = remove(fullname);
1332
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
1335
}
1336
free(fullname);
1337
}
1338
closedir(d);
1339
}
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
3080
/* Cleans up the circular linked list of Mandos servers the client
3081
has seen */
3082
if(mc.current_server != NULL){
3083
mc.current_server->prev->next = NULL;
3084
while(mc.current_server != NULL){
3085
server *next = mc.current_server->next;
3086
#ifdef __GNUC__
3087
#pragma GCC diagnostic push
3088
#pragma GCC diagnostic ignored "-Wcast-qual"
3089
#endif
3090
free((char *)(mc.current_server->ip));
3091
#ifdef __GNUC__
3092
#pragma GCC diagnostic pop
3093
#endif
3094
free(mc.current_server);
3095
mc.current_server = next;
3096
}
3097
}
3098
3099
/* Re-raise privileges */
3100
{
3101
ret = raise_privileges();
3102
if(ret != 0){
3103
errno = ret;
3104
perror_plus("Failed to raise privileges");
3105
} else {
3106
3107
/* Run network hooks */
3108
run_network_hooks("stop", interfaces_hooks != NULL ?
3109
interfaces_hooks : "", delay);
3110
3111
/* Take down the network interfaces which were brought up */
3112
{
3113
char *interface = NULL;
3114
while((interface = argz_next(interfaces_to_take_down,
3115
interfaces_to_take_down_size,
3116
interface))){
3117
ret = take_down_interface(interface);
3118
if(ret != 0){
3119
errno = ret;
3120
perror_plus("Failed to take down interface");
3121
}
3122
}
3123
if(debug and (interfaces_to_take_down == NULL)){
3124
fprintf_plus(stderr, "No interfaces needed to be taken"
3125
" down\n");
3126
}
3127
}
3128
}
3129
3130
ret = lower_privileges_permanently();
3131
if(ret != 0){
3132
errno = ret;
3133
perror_plus("Failed to lower privileges permanently");
3134
}
3135
}
3136
3137
free(interfaces_to_take_down);
3138
free(interfaces_hooks);
3139
3140
void clean_dir_at(int base, const char * const dirname,
3141
uintmax_t level){
3142
struct dirent **direntries = NULL;
3143
int dret;
3144
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3145
O_RDONLY
3146
| O_NOFOLLOW
3147
| O_DIRECTORY
3148
| O_PATH));
3149
if(dir_fd == -1){
3150
perror_plus("open");
3151
return;
3152
}
3153
int numentries = scandirat(dir_fd, ".", &direntries,
3154
notdotentries, alphasort);
3155
if(numentries >= 0){
3156
for(int i = 0; i < numentries; i++){
3157
if(debug){
3158
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3159
dirname, direntries[i]->d_name);
3160
}
3161
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3162
if(dret == -1){
3163
if(errno == EISDIR){
3164
dret = unlinkat(dir_fd, direntries[i]->d_name,
3165
AT_REMOVEDIR);
3166
}
3167
if((dret == -1) and (errno == ENOTEMPTY)
3168
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3169
== 0) and (level == 0)){
3170
/* Recurse only in this special case */
3171
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3172
dret = 0;
3173
}
3174
if((dret == -1) and (errno != ENOENT)){
3175
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3176
direntries[i]->d_name, strerror(errno));
3177
}
3178
}
3179
free(direntries[i]);
3180
}
3181
3182
/* need to clean even if 0 because man page doesn't specify */
3183
free(direntries);
3184
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3185
if(dret == -1 and errno != ENOENT){
3186
perror_plus("rmdir");
3187
}
3188
} else {
3189
perror_plus("scandirat");
3190
}
3191
close(dir_fd);
3192
}
3193
3194
/* Removes the GPGME temp directory and all files inside */
3195
if(tempdir != NULL){
3196
clean_dir_at(-1, tempdir, 0);
3197
}
3198
3199
if(quit_now){
3200
sigemptyset(&old_sigterm_action.sa_mask);
3201
old_sigterm_action.sa_handler = SIG_DFL;
3202
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3203
&old_sigterm_action,
3204
NULL));
3205
if(ret == -1){
3206
perror_plus("sigaction");
3207
}
3208
do {
3209
ret = raise(signal_received);
3210
} while(ret != 0 and errno == EINTR);
3211
if(ret != 0){
3212
perror_plus("raise");
3213
abort();
3214
}
3215
TEMP_FAILURE_RETRY(pause());
1344
3216
}
1345
3217
1346
3218
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0