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- Committer: Teddy Hogeborn
- Date: 2017-02-21 18:23:54 UTC
- Revision ID: teddy@recompile.se-20170221182354-qjl75f74t02bbm5n
Suppress lintian warning about lsb-base dependency
This warning is erroneous since we do depend on lsb-base, we just also
depend on systemd-sysv as an alternative, since if that is installed,
the /etc/init.d/mandos script (which is the thing which actually
requires lsb-base) is never run anyway. Suppress this warning.
* debian/mandos.lintian-overrides (mandos): Add new line
"init.d-script-needs-depends-on-lsb-base etc/init.d/mandos (line
49)"
This warning is erroneous since we do depend on lsb-base, we just also
depend on systemd-sysv as an alternative, since if that is installed,
the /etc/init.d/mandos script (which is the thing which actually
requires lsb-base) is never run anyway. Suppress this warning.
* debian/mandos.lintian-overrides (mandos): Add new line
"init.d-script-needs-depends-on-lsb-base etc/init.d/mandos (line
49)"
- files added:
- bugs.xml
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
51
52
#include <sys/ioctl.h> /* ioctl */
52
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
54
sockaddr_in6, PF_INET6,
55
56
opendir(), DIR */
56
57
#include <sys/stat.h> /* open(), S_ISREG */
57
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
63
*/
62
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
65
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
66
71
program_invocation_short_name */
67
72
#include <time.h> /* nanosleep(), time(), sleep() */
68
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
78
*/
74
79
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
80
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
78
84
#include <iso646.h> /* not, or, and */
79
85
#include <argp.h> /* struct argp_option, error_t, struct
80
86
argp_state, struct argp,
87
93
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
94
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
95
WEXITSTATUS(), WTERMSIG() */
96
#include <grp.h> /* setgroups() */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
90
103
91
104
#ifdef __linux__
92
105
#include <sys/klog.h> /* klogctl() */
110
123
init_gnutls_session(),
111
124
GNUTLS_* */
112
125
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
126
/* gnutls_certificate_set_openpgp_key_file(),
127
GNUTLS_OPENPGP_FMT_BASE64 */
115
128
116
129
/* GPGME */
117
130
#include <gpgme.h> /* All GPGME types, constants and
134
147
static const char sys_class_net[] = "/sys/class/net";
135
148
char *connect_to = NULL;
136
149
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
uid_t uid = 65534;
152
gid_t gid = 65534;
137
153
138
154
/* Doubly linked list that need to be circularly linked when used */
139
155
typedef struct server{
140
156
const char *ip;
141
uint16_t port;
157
in_port_t port;
142
158
AvahiIfIndex if_index;
143
159
int af;
144
160
struct timespec last_seen;
148
164
149
165
/* Used for passing in values through the Avahi callback functions */
150
166
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
167
AvahiServer *server;
153
168
gnutls_certificate_credentials_t cred;
154
169
unsigned int dh_bits;
156
171
const char *priority;
157
172
gpgme_ctx_t ctx;
158
173
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
159
176
} mandos_context;
160
177
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
166
180
167
181
sig_atomic_t quit_now = 0;
168
182
int signal_received = 0;
169
183
170
184
/* Function to use when printing errors */
171
185
void perror_plus(const char *print_text){
186
int e = errno;
172
187
fprintf(stderr, "Mandos plugin %s: ",
173
188
program_invocation_short_name);
189
errno = e;
174
190
perror(print_text);
175
191
}
176
192
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
194
int fprintf_plus(FILE *stream, const char *format, ...){
195
va_list ap;
196
va_start (ap, format);
197
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
}
202
177
203
/*
178
204
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
205
* bytes. "buffer_capacity" is how much is currently allocated,
180
206
* "buffer_length" is how much is already used.
181
207
*/
208
__attribute__((nonnull, warn_unused_result))
182
209
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
210
size_t buffer_capacity){
184
211
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
187
218
return 0;
188
219
}
220
*buffer = new_buf;
189
221
buffer_capacity += BUFFER_SIZE;
190
222
}
191
223
return buffer_capacity;
192
224
}
193
225
194
226
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
198
230
int ret;
199
231
server *new_server = malloc(sizeof(server));
200
232
if(new_server == NULL){
201
233
perror_plus("malloc");
202
return -1;
234
return false;
203
235
}
204
236
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
237
.port = port,
238
.if_index = if_index,
239
.af = af };
208
240
if(new_server->ip == NULL){
209
241
perror_plus("strdup");
210
return -1;
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
return false;
211
258
}
212
259
/* Special case of first server */
213
if (mc.current_server == NULL){
260
if(*current_server == NULL){
214
261
new_server->next = new_server;
215
262
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
263
*current_server = new_server;
218
264
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
221
268
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
269
(*current_server)->prev = new_server;
270
}
271
return true;
230
272
}
231
273
232
274
/*
233
275
* Initialize GPGME.
234
276
*/
235
static bool init_gpgme(const char *seckey,
236
const char *pubkey, const char *tempdir){
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
237
282
gpgme_error_t rc;
238
283
gpgme_engine_info_t engine_info;
239
284
240
241
285
/*
242
286
* Helper function to insert pub and seckey to the engine keyring.
243
287
*/
244
bool import_key(const char *filename){
288
bool import_key(const char * const filename){
245
289
int ret;
246
290
int fd;
247
291
gpgme_data_t pgp_data;
254
298
255
299
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
300
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
259
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
260
303
return false;
261
304
}
262
305
263
rc = gpgme_op_import(mc.ctx, pgp_data);
306
rc = gpgme_op_import(mc->ctx, pgp_data);
264
307
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
268
310
return false;
269
311
}
270
312
271
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
ret = close(fd);
272
314
if(ret == -1){
273
315
perror_plus("close");
274
316
}
277
319
}
278
320
279
321
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
322
fprintf_plus(stderr, "Initializing GPGME\n");
282
323
}
283
324
284
325
/* Init GPGME */
285
326
gpgme_check_version(NULL);
286
327
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
328
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
329
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
330
gpgme_strsource(rc), gpgme_strerror(rc));
291
331
return false;
292
332
}
293
333
294
334
/* Set GPGME home directory for the OpenPGP engine only */
295
335
rc = gpgme_get_engine_info(&engine_info);
296
336
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
337
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
338
gpgme_strsource(rc), gpgme_strerror(rc));
300
339
return false;
301
340
}
302
341
while(engine_info != NULL){
308
347
engine_info = engine_info->next;
309
348
}
310
349
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
350
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
351
tempdir);
313
352
return false;
314
353
}
315
354
316
355
/* Create new GPGME "context" */
317
rc = gpgme_new(&(mc.ctx));
356
rc = gpgme_new(&(mc->ctx));
318
357
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
gpgme_strerror(rc));
322
361
return false;
323
362
}
324
363
333
372
* Decrypt OpenPGP data.
334
373
* Returns -1 on error
335
374
*/
375
__attribute__((nonnull, warn_unused_result))
336
376
static ssize_t pgp_packet_decrypt(const char *cryptotext,
337
377
size_t crypto_size,
338
char **plaintext){
378
char **plaintext,
379
mandos_context *mc){
339
380
gpgme_data_t dh_crypto, dh_plain;
340
381
gpgme_error_t rc;
341
382
ssize_t ret;
343
384
ssize_t plaintext_length = 0;
344
385
345
386
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
348
388
}
349
389
350
390
/* Create new GPGME data buffer from memory cryptotext */
351
391
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
392
0);
353
393
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
356
gpgme_strsource(rc), gpgme_strerror(rc));
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
357
396
return -1;
358
397
}
359
398
360
399
/* Create new empty GPGME data buffer for the plaintext */
361
400
rc = gpgme_data_new(&dh_plain);
362
401
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
365
gpgme_strsource(rc), gpgme_strerror(rc));
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
366
405
gpgme_data_release(dh_crypto);
367
406
return -1;
368
407
}
369
408
370
409
/* Decrypt data from the cryptotext data buffer to the plaintext
371
410
data buffer */
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
412
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
377
415
plaintext_length = -1;
378
416
if(debug){
379
417
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
418
result = gpgme_op_decrypt_result(mc->ctx);
381
419
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
421
} else {
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
390
result->wrong_key_usage);
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
391
426
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
428
}
395
429
gpgme_recipient_t recipient;
396
430
recipient = result->recipients;
397
431
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
432
fprintf_plus(stderr, "Public key algorithm: %s\n",
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
435
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
436
fprintf_plus(stderr, "Secret key available: %s\n",
437
recipient->status == GPG_ERR_NO_SECKEY
438
? "No" : "Yes");
407
439
recipient = recipient->next;
408
440
}
409
441
}
412
444
}
413
445
414
446
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
447
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
417
448
}
418
449
419
450
/* Seek back to the beginning of the GPGME plaintext data buffer */
426
457
*plaintext = NULL;
427
458
while(true){
428
459
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
460
(size_t)plaintext_length,
461
plaintext_capacity);
431
462
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
463
perror_plus("incbuffer");
464
plaintext_length = -1;
465
goto decrypt_end;
435
466
}
436
467
437
468
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
481
}
451
482
452
483
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
484
fprintf_plus(stderr, "Decrypted password is: ");
455
485
for(ssize_t i = 0; i < plaintext_length; i++){
456
486
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
487
}
468
498
return plaintext_length;
469
499
}
470
500
471
static const char * safer_gnutls_strerror(int value){
472
const char *ret = gnutls_strerror(value); /* Spurious warning from
473
-Wunreachable-code */
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
477
512
}
478
513
479
514
/* GnuTLS log function callback */
515
__attribute__((nonnull))
480
516
static void debuggnutls(__attribute__((unused)) int level,
481
517
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
518
fprintf_plus(stderr, "GnuTLS: %s", string);
483
519
}
484
520
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
485
522
static int init_gnutls_global(const char *pubkeyfilename,
486
const char *seckeyfilename){
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
487
526
int ret;
527
unsigned int uret;
488
528
489
529
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
492
}
493
494
ret = gnutls_global_init();
495
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
498
return -1;
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
499
531
}
500
532
501
533
if(debug){
507
539
}
508
540
509
541
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
511
543
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
514
gnutls_global_deinit();
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
515
546
return -1;
516
547
}
517
548
518
549
if(debug){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
522
seckeyfilename);
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
552
pubkeyfilename,
553
seckeyfilename);
523
554
}
524
555
525
556
ret = gnutls_certificate_set_openpgp_key_file
526
(mc.cred, pubkeyfilename, seckeyfilename,
557
(mc->cred, pubkeyfilename, seckeyfilename,
527
558
GNUTLS_OPENPGP_FMT_BASE64);
528
559
if(ret != GNUTLS_E_SUCCESS){
529
fprintf(stderr,
530
"Mandos plugin mandos-client: "
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
560
fprintf_plus(stderr,
561
"Error[%d] while reading the OpenPGP key pair ('%s',"
562
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
564
safer_gnutls_strerror(ret));
535
565
goto globalfail;
536
566
}
537
567
538
568
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
540
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
543
" %s\n", safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
550
safer_gnutls_strerror(ret));
551
goto globalfail;
552
}
553
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
ret = gnutls_dh_params_init(&mc->dh_params);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
" initialization: %s\n",
573
safer_gnutls_strerror(ret));
574
goto globalfail;
575
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
555
750
556
751
return 0;
557
752
558
753
globalfail:
559
754
560
gnutls_certificate_free_credentials(mc.cred);
561
gnutls_global_deinit();
562
gnutls_dh_params_deinit(mc.dh_params);
755
gnutls_certificate_free_credentials(mc->cred);
756
gnutls_dh_params_deinit(mc->dh_params);
563
757
return -1;
564
758
}
565
759
566
static int init_gnutls_session(gnutls_session_t *session){
760
__attribute__((nonnull, warn_unused_result))
761
static int init_gnutls_session(gnutls_session_t *session,
762
mandos_context *mc){
567
763
int ret;
568
764
/* GnuTLS session creation */
569
765
do {
573
769
}
574
770
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
575
771
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
578
safer_gnutls_strerror(ret));
772
fprintf_plus(stderr,
773
"Error in GnuTLS session initialization: %s\n",
774
safer_gnutls_strerror(ret));
579
775
}
580
776
581
777
{
582
778
const char *err;
583
779
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
780
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
585
781
if(quit_now){
586
782
gnutls_deinit(*session);
587
783
return -1;
588
784
}
589
785
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
786
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
787
fprintf_plus(stderr, "Syntax error at: %s\n", err);
788
fprintf_plus(stderr, "GnuTLS error: %s\n",
789
safer_gnutls_strerror(ret));
595
790
gnutls_deinit(*session);
596
791
return -1;
597
792
}
599
794
600
795
do {
601
796
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
797
mc->cred);
603
798
if(quit_now){
604
799
gnutls_deinit(*session);
605
800
return -1;
606
801
}
607
802
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
608
803
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
804
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
805
safer_gnutls_strerror(ret));
612
806
gnutls_deinit(*session);
613
807
return -1;
614
808
}
616
810
/* ignore client certificate if any. */
617
811
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
618
812
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
620
621
813
return 0;
622
814
}
623
815
625
817
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
626
818
__attribute__((unused)) const char *txt){}
627
819
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
628
1038
/* Called when a Mandos server is found */
629
static int start_mandos_communication(const char *ip, uint16_t port,
1039
__attribute__((nonnull, warn_unused_result))
1040
static int start_mandos_communication(const char *ip, in_port_t port,
630
1041
AvahiIfIndex if_index,
631
int af){
1042
int af, mandos_context *mc){
632
1043
int ret, tcp_sd = -1;
633
1044
ssize_t sret;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
1045
struct sockaddr_storage to;
638
1046
char *buffer = NULL;
639
1047
char *decrypted_buffer = NULL;
640
1048
size_t buffer_length = 0;
643
1051
int retval = -1;
644
1052
gnutls_session_t session;
645
1053
int pf; /* Protocol family */
1054
bool route_added = false;
646
1055
647
1056
errno = 0;
648
1057
659
1068
pf = PF_INET;
660
1069
break;
661
1070
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
1071
fprintf_plus(stderr, "Bad address family: %d\n", af);
664
1072
errno = EINVAL;
665
1073
return -1;
666
1074
}
667
1075
668
ret = init_gnutls_session(&session);
1076
/* If the interface is specified and we have a list of interfaces */
1077
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1078
/* Check if the interface is one of the interfaces we are using */
1079
bool match = false;
1080
{
1081
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
1085
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
match = true;
1087
break;
1088
}
1089
}
1090
}
1091
if(not match){
1092
/* This interface does not match any in the list, so we don't
1093
connect to the server */
1094
if(debug){
1095
char interface[IF_NAMESIZE];
1096
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1097
perror_plus("if_indextoname");
1098
} else {
1099
fprintf_plus(stderr, "Skipping server on non-used interface"
1100
" \"%s\"\n",
1101
if_indextoname((unsigned int)if_index,
1102
interface));
1103
}
1104
}
1105
return -1;
1106
}
1107
}
1108
1109
ret = init_gnutls_session(&session, mc);
669
1110
if(ret != 0){
670
1111
return -1;
671
1112
}
672
1113
673
1114
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
676
"\n", ip, port);
1115
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1116
PRIuMAX "\n", ip, (uintmax_t)port);
677
1117
}
678
1118
679
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
680
1120
if(tcp_sd < 0){
681
1121
int e = errno;
682
1122
perror_plus("socket");
689
1129
goto mandos_end;
690
1130
}
691
1131
692
memset(&to, 0, sizeof(to));
693
1132
if(af == AF_INET6){
694
to.in6.sin6_family = (sa_family_t)af;
695
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
696
1136
} else { /* IPv4 */
697
to.in.sin_family = (sa_family_t)af;
698
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
699
1140
}
700
1141
if(ret < 0 ){
701
1142
int e = errno;
705
1146
}
706
1147
if(ret == 0){
707
1148
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
1149
fprintf_plus(stderr, "Bad address: %s\n", ip);
710
1150
errno = e;
711
1151
goto mandos_end;
712
1152
}
713
1153
if(af == AF_INET6){
714
to.in6.sin6_port = htons(port); /* Spurious warnings from
715
-Wconversion and
716
-Wunreachable-code */
717
718
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
719
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
-Wunreachable-code*/
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
721
1157
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
724
" without a network interface\n");
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
" incomplete without a network interface\n");
725
1160
errno = EINVAL;
726
1161
goto mandos_end;
727
1162
}
728
1163
/* Set the network interface number as scope */
729
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
730
1165
}
731
1166
} else {
732
to.in.sin_port = htons(port); /* Spurious warnings from
733
-Wconversion and
734
-Wunreachable-code */
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
735
1168
}
736
1169
737
1170
if(quit_now){
745
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
1179
perror_plus("if_indextoname");
747
1180
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
751
1183
}
752
1184
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
755
1187
}
756
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
758
const char *pcret;
759
if(af == AF_INET6){
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
761
sizeof(addrstr));
762
} else {
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
764
sizeof(addrstr));
765
}
766
if(pcret == NULL){
767
perror_plus("inet_ntop");
768
} else {
769
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
772
}
773
}
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
if(af == AF_INET6){
782
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
} else {
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
785
}
786
if(ret < 0){
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
int e = errno;
789
perror_plus("connect");
790
errno = e;
791
}
792
goto mandos_end;
793
}
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
798
1270
}
799
1271
800
1272
const char *out = mandos_protocol_version;
802
1274
while(true){
803
1275
size_t out_size = strlen(out);
804
1276
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
805
out_size - written));
1277
out_size - written));
806
1278
if(ret == -1){
807
1279
int e = errno;
808
1280
perror_plus("write");
828
1300
}
829
1301
830
1302
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
1303
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
833
1304
}
834
1305
835
1306
if(quit_now){
837
1308
goto mandos_end;
838
1309
}
839
1310
840
/* Spurious warning from -Wint-to-pointer-cast */
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1311
/* This casting via intptr_t is to eliminate warning about casting
1312
an int to a pointer type. This is exactly how the GnuTLS Guile
1313
function "set-session-transport-fd!" does it. */
1314
gnutls_transport_set_ptr(session,
1315
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
842
1316
843
1317
if(quit_now){
844
1318
errno = EINTR;
855
1329
856
1330
if(ret != GNUTLS_E_SUCCESS){
857
1331
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
1332
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
860
1333
gnutls_perror(ret);
861
1334
}
862
1335
errno = EPROTO;
866
1339
/* Read OpenPGP packet that contains the wanted password */
867
1340
868
1341
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
1342
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1343
" %s\n", ip);
871
1344
}
872
1345
873
1346
while(true){
878
1351
}
879
1352
880
1353
buffer_capacity = incbuffer(&buffer, buffer_length,
881
buffer_capacity);
1354
buffer_capacity);
882
1355
if(buffer_capacity == 0){
883
1356
int e = errno;
884
1357
perror_plus("incbuffer");
911
1384
}
912
1385
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
1386
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
1387
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1388
"***\n");
916
1389
gnutls_perror(ret);
917
1390
errno = EPROTO;
918
1391
goto mandos_end;
919
1392
}
920
1393
break;
921
1394
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
924
" encrypted session with Mandos server\n");
1395
fprintf_plus(stderr, "Unknown error while reading data from"
1396
" encrypted session with Mandos server\n");
925
1397
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
1398
errno = EIO;
927
1399
goto mandos_end;
932
1404
}
933
1405
934
1406
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
1407
fprintf_plus(stderr, "Closing TLS session\n");
937
1408
}
938
1409
939
1410
if(quit_now){
951
1422
952
1423
if(buffer_length > 0){
953
1424
ssize_t decrypted_buffer_size;
954
decrypted_buffer_size = pgp_packet_decrypt(buffer,
955
buffer_length,
956
&decrypted_buffer);
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1426
&decrypted_buffer, mc);
957
1427
if(decrypted_buffer_size >= 0){
958
1428
1429
clearerr(stdout);
959
1430
written = 0;
960
1431
while(written < (size_t) decrypted_buffer_size){
961
1432
if(quit_now){
969
1440
if(ret == 0 and ferror(stdout)){
970
1441
int e = errno;
971
1442
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
974
strerror(errno));
1443
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1444
strerror(errno));
975
1445
}
976
1446
errno = e;
977
1447
goto mandos_end;
978
1448
}
979
1449
written += (size_t)ret;
980
1450
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
981
1461
retval = 0;
982
1462
}
983
1463
}
986
1466
987
1467
mandos_end:
988
1468
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
989
1475
int e = errno;
990
1476
free(decrypted_buffer);
991
1477
free(buffer);
992
1478
if(tcp_sd >= 0){
993
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1479
ret = close(tcp_sd);
994
1480
}
995
1481
if(ret == -1){
996
1482
if(e == 0){
1008
1494
return retval;
1009
1495
}
1010
1496
1497
__attribute__((nonnull))
1011
1498
static void resolve_callback(AvahiSServiceResolver *r,
1012
1499
AvahiIfIndex interface,
1013
1500
AvahiProtocol proto,
1021
1508
AVAHI_GCC_UNUSED AvahiStringList *txt,
1022
1509
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1023
1510
flags,
1024
AVAHI_GCC_UNUSED void* userdata){
1025
assert(r);
1511
void *mc){
1512
if(r == NULL){
1513
return;
1514
}
1026
1515
1027
1516
/* Called whenever a service has been resolved successfully or
1028
1517
timed out */
1029
1518
1030
1519
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1031
1521
return;
1032
1522
}
1033
1523
1034
1524
switch(event){
1035
1525
default:
1036
1526
case AVAHI_RESOLVER_FAILURE:
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
1039
" of type '%s' in domain '%s': %s\n", name, type, domain,
1040
avahi_strerror(avahi_server_errno(mc.server)));
1527
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1528
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1529
domain,
1530
avahi_strerror(avahi_server_errno
1531
(((mandos_context*)mc)->server)));
1041
1532
break;
1042
1533
1043
1534
case AVAHI_RESOLVER_FOUND:
1045
1536
char ip[AVAHI_ADDRESS_STR_MAX];
1046
1537
avahi_address_snprint(ip, sizeof(ip), address);
1047
1538
if(debug){
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
ip, (intmax_t)interface, port);
1539
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1540
PRIdMAX ") on port %" PRIu16 "\n", name,
1541
host_name, ip, (intmax_t)interface, port);
1052
1542
}
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
1543
int ret = start_mandos_communication(ip, (in_port_t)port,
1544
interface,
1545
avahi_proto_to_af(proto),
1546
mc);
1055
1547
if(ret == 0){
1056
avahi_simple_poll_quit(mc.simple_poll);
1548
avahi_simple_poll_quit(simple_poll);
1057
1549
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1550
if(not add_server(ip, (in_port_t)port, interface,
1551
avahi_proto_to_af(proto),
1552
&((mandos_context*)mc)->current_server)){
1553
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1554
" list\n", name);
1555
}
1060
1556
}
1061
1557
}
1062
1558
}
1072
1568
const char *domain,
1073
1569
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1074
1570
flags,
1075
AVAHI_GCC_UNUSED void* userdata){
1076
assert(b);
1571
void *mc){
1572
if(b == NULL){
1573
return;
1574
}
1077
1575
1078
1576
/* Called whenever a new services becomes available on the LAN or
1079
1577
is removed from the LAN */
1086
1584
default:
1087
1585
case AVAHI_BROWSER_FAILURE:
1088
1586
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
1091
avahi_strerror(avahi_server_errno(mc.server)));
1092
avahi_simple_poll_quit(mc.simple_poll);
1587
fprintf_plus(stderr, "(Avahi browser) %s\n",
1588
avahi_strerror(avahi_server_errno
1589
(((mandos_context*)mc)->server)));
1590
avahi_simple_poll_quit(simple_poll);
1093
1591
return;
1094
1592
1095
1593
case AVAHI_BROWSER_NEW:
1098
1596
the callback function is called the Avahi server will free the
1099
1597
resolver for us. */
1100
1598
1101
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
name, type, domain, protocol, 0,
1103
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
1106
name, avahi_strerror(avahi_server_errno(mc.server)));
1599
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1600
interface, protocol, name, type,
1601
domain, protocol, 0,
1602
resolve_callback, mc) == NULL)
1603
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1604
" %s\n", name,
1605
avahi_strerror(avahi_server_errno
1606
(((mandos_context*)mc)->server)));
1107
1607
break;
1108
1608
1109
1609
case AVAHI_BROWSER_REMOVE:
1112
1612
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
1613
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
1614
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
1615
fprintf_plus(stderr, "No Mandos server found, still"
1616
" searching...\n");
1117
1617
}
1118
1618
break;
1119
1619
}
1128
1628
signal_received = sig;
1129
1629
int old_errno = errno;
1130
1630
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1631
if(simple_poll != NULL){
1632
avahi_simple_poll_quit(simple_poll);
1133
1633
}
1134
1634
errno = old_errno;
1135
1635
}
1136
1636
1637
__attribute__((nonnull, warn_unused_result))
1137
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
1639
int ret;
1640
int old_errno;
1139
1641
1140
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
1643
if(s < 0){
1644
old_errno = errno;
1142
1645
perror_plus("socket");
1646
errno = old_errno;
1143
1647
return false;
1144
1648
}
1145
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1146
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
1652
if(ret == -1){
1148
1653
if(debug){
1654
old_errno = errno;
1149
1655
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1150
1657
}
1151
1658
return false;
1152
1659
}
1153
1660
return true;
1154
1661
}
1155
1662
1663
__attribute__((nonnull, warn_unused_result))
1156
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1665
1158
1666
/* Reject the loopback device */
1159
1667
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
1668
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1669
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1670
ifname);
1163
1671
}
1164
1672
return false;
1165
1673
}
1166
1674
/* Accept point-to-point devices only if connect_to is specified */
1167
1675
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
1676
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1677
fprintf_plus(stderr, "Accepting point-to-point interface"
1678
" \"%s\"\n", ifname);
1171
1679
}
1172
1680
return true;
1173
1681
}
1174
1682
/* Otherwise, reject non-broadcast-capable devices */
1175
1683
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
1684
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1685
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1686
" \"%s\"\n", ifname);
1179
1687
}
1180
1688
return false;
1181
1689
}
1182
1690
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
1691
if(ifr->ifr_flags & IFF_NOARP){
1184
1692
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1693
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1694
ifname);
1187
1695
}
1188
1696
return false;
1189
1697
}
1190
1698
1191
1699
/* Accept this device */
1192
1700
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1701
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1195
1702
}
1196
1703
return true;
1197
1704
}
1201
1708
* corresponds to an acceptable network device.
1202
1709
* (This function is passed to scandir(3) as a filter function.)
1203
1710
*/
1711
__attribute__((nonnull, warn_unused_result))
1204
1712
int good_interface(const struct dirent *if_entry){
1205
1713
if(if_entry->d_name[0] == '.'){
1206
1714
return 0;
1209
1717
struct ifreq ifr;
1210
1718
if(not get_flags(if_entry->d_name, &ifr)){
1211
1719
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1720
fprintf_plus(stderr, "Failed to get flags for interface "
1721
"\"%s\"\n", if_entry->d_name);
1722
}
1723
return 0;
1724
}
1725
1726
if(not good_flags(if_entry->d_name, &ifr)){
1727
return 0;
1728
}
1729
return 1;
1730
}
1731
1732
/*
1733
* This function determines if a network interface is up.
1734
*/
1735
__attribute__((nonnull, warn_unused_result))
1736
bool interface_is_up(const char *interface){
1737
struct ifreq ifr;
1738
if(not get_flags(interface, &ifr)){
1739
if(debug){
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
}
1743
return false;
1744
}
1745
1746
return (bool)(ifr.ifr_flags & IFF_UP);
1747
}
1748
1749
/*
1750
* This function determines if a network interface is running
1751
*/
1752
__attribute__((nonnull, warn_unused_result))
1753
bool interface_is_running(const char *interface){
1754
struct ifreq ifr;
1755
if(not get_flags(interface, &ifr)){
1756
if(debug){
1757
fprintf_plus(stderr, "Failed to get flags for interface "
1758
"\"%s\"\n", interface);
1759
}
1760
return false;
1761
}
1762
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
}
1765
1766
__attribute__((nonnull, pure, warn_unused_result))
1271
1767
int notdotentries(const struct dirent *direntry){
1272
1768
/* Skip "." and ".." */
1273
1769
if(direntry->d_name[0] == '.'
1280
1776
}
1281
1777
1282
1778
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1283
1780
int runnable_hook(const struct dirent *direntry){
1284
1781
int ret;
1782
size_t sret;
1285
1783
struct stat st;
1286
1784
1287
1785
if((direntry->d_name)[0] == '\0'){
1289
1787
return 0;
1290
1788
}
1291
1789
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1311
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1790
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1791
"abcdefghijklmnopqrstuvwxyz"
1792
"0123456789"
1793
"_.-");
1794
if((direntry->d_name)[sret] != '\0'){
1795
/* Contains non-allowed characters */
1796
if(debug){
1797
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1798
direntry->d_name);
1799
}
1800
return 0;
1801
}
1802
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1317
1804
if(ret == -1){
1318
1805
if(debug){
1319
perror_plus("Could not stat plugin");
1806
perror_plus("Could not stat hook");
1320
1807
}
1321
1808
return 0;
1322
1809
}
1323
1810
if(not (S_ISREG(st.st_mode))){
1324
1811
/* Not a regular file */
1812
if(debug){
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1814
direntry->d_name);
1815
}
1325
1816
return 0;
1326
1817
}
1327
1818
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
1819
/* Not executable */
1820
if(debug){
1821
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1822
direntry->d_name);
1823
}
1329
1824
return 0;
1330
1825
}
1826
if(debug){
1827
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1828
direntry->d_name);
1829
}
1331
1830
return 1;
1332
1831
}
1333
1832
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1335
1836
int ret;
1336
1837
struct timespec now;
1337
1838
struct timespec waited_time;
1338
1839
intmax_t block_time;
1339
1840
1340
1841
while(true){
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1842
if(mc->current_server == NULL){
1843
if(debug){
1844
fprintf_plus(stderr, "Wait until first server is found."
1845
" No timeout!\n");
1345
1846
}
1346
1847
ret = avahi_simple_poll_iterate(s, -1);
1347
1848
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1849
if(debug){
1850
fprintf_plus(stderr, "Check current_server if we should run"
1851
" it, or wait\n");
1352
1852
}
1353
1853
/* the current time */
1354
1854
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1359
1859
/* Calculating in ms how long time between now and server
1360
1860
who we visted longest time ago. Now - last seen. */
1361
1861
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1862
- mc->current_server->last_seen.tv_sec);
1363
1863
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1864
- mc->current_server->last_seen.tv_nsec);
1365
1865
/* total time is 10s/10,000ms.
1366
1866
Converting to s from ms by dividing by 1,000,
1367
1867
and ns to ms by dividing by 1,000,000. */
1369
1869
- ((intmax_t)waited_time.tv_sec * 1000))
1370
1870
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1871
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1872
if(debug){
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1874
block_time);
1375
1875
}
1376
1876
1377
1877
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1878
ret = start_mandos_communication(mc->current_server->ip,
1879
mc->current_server->port,
1880
mc->current_server->if_index,
1881
mc->current_server->af, mc);
1382
1882
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1883
avahi_simple_poll_quit(s);
1384
1884
return 0;
1385
1885
}
1386
1886
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1887
&mc->current_server->last_seen);
1388
1888
if(ret == -1){
1389
1889
perror_plus("clock_gettime");
1390
1890
return -1;
1391
1891
}
1392
mc.current_server = mc.current_server->next;
1892
mc->current_server = mc->current_server->next;
1393
1893
block_time = 0; /* Call avahi to find new Mandos
1394
1894
servers, but don't block */
1395
1895
}
1397
1897
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
1898
}
1399
1899
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1900
if(ret > 0 or errno != EINTR){
1401
1901
return (ret != 1) ? ret : 0;
1402
1902
}
1403
1903
}
1404
1904
}
1405
1905
}
1406
1906
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1909
const float delay){
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1928
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1944
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1991
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1996
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
2065
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
2085
}
2086
2087
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
2091
int ret;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2094
if(if_index == 0){
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2096
errno = old_errno;
2097
return ENXIO;
2098
}
2099
2100
if(quit_now){
2101
errno = old_errno;
2102
return EINTR;
2103
}
2104
2105
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2109
ret_errno = errno;
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
return ret_errno;
2114
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
2116
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
2119
ret_errno = errno;
2120
perror_plus("socket");
2121
errno = old_errno;
2122
return ret_errno;
2123
}
2124
2125
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
2130
errno = old_errno;
2131
return EINTR;
2132
}
2133
2134
if(debug){
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
interface);
2137
}
2138
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
2145
2146
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
2158
}
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2162
#ifdef __linux__
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2167
}
2168
}
2169
#endif /* __linux__ */
2170
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
2180
2181
/* Close the socket */
2182
ret = close(sd);
2183
if(ret == -1){
2184
perror_plus("close");
2185
}
2186
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
errno = old_errno;
2191
return ioctl_errno;
2192
}
2193
} else if(debug){
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
interface);
2196
}
2197
2198
/* Sleep checking until interface is running.
2199
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
2202
break;
2203
}
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
2205
ret = nanosleep(&sleeptime, NULL);
2206
if(ret == -1 and errno != EINTR){
2207
perror_plus("nanosleep");
2208
}
2209
}
2210
2211
errno = old_errno;
2212
return 0;
2213
}
2214
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2220
if(if_index == 0){
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
errno = old_errno;
2223
return ENXIO;
2224
}
2225
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2228
if(not get_flags(interface, &network) and debug){
2229
ret_errno = errno;
2230
fprintf_plus(stderr, "Failed to get flags for interface "
2231
"\"%s\"\n", interface);
2232
errno = old_errno;
2233
return ret_errno;
2234
}
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
if(sd == -1){
2239
ret_errno = errno;
2240
perror_plus("socket");
2241
errno = old_errno;
2242
return ret_errno;
2243
}
2244
2245
if(debug){
2246
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2247
interface);
2248
}
2249
2250
/* Raise privileges */
2251
ret_errno = raise_privileges();
2252
if(ret_errno != 0){
2253
errno = ret_errno;
2254
perror_plus("Failed to raise privileges");
2255
}
2256
2257
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2258
ioctl_errno = errno;
2259
2260
/* If raise_privileges() succeeded above */
2261
if(ret_errno == 0){
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
2270
/* Close the socket */
2271
int ret = close(sd);
2272
if(ret == -1){
2273
perror_plus("close");
2274
}
2275
2276
if(ret_setflags == -1){
2277
errno = ioctl_errno;
2278
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2279
errno = old_errno;
2280
return ioctl_errno;
2281
}
2282
} else if(debug){
2283
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2284
interface);
2285
}
2286
2287
errno = old_errno;
2288
return 0;
2289
}
2290
1407
2291
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
1408
2297
AvahiSServiceBrowser *sb = NULL;
1409
int error;
2298
error_t ret_errno;
1410
2299
int ret;
1411
2300
intmax_t tmpmax;
1412
2301
char *tmp;
1413
2302
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
1415
struct ifreq network;
1416
int sd = -1;
1417
bool take_down_interface = false;
1418
uid_t uid;
1419
gid_t gid;
1420
char tempdir[] = "/tmp/mandosXXXXXX";
1421
bool tempdir_created = false;
2303
char *interfaces_to_take_down = NULL;
2304
size_t interfaces_to_take_down_size = 0;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1422
2308
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
2309
const char *seckey = PATHDIR "/" SECKEY;
1424
2310
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
char *interfaces_hooks = NULL;
1425
2313
1426
2314
bool gnutls_initialized = false;
1427
2315
bool gpgme_initialized = false;
1479
2367
.doc = "Bit length of the prime number used in the"
1480
2368
" Diffie-Hellman key exchange",
1481
2369
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
1482
2375
{ .name = "priority", .key = 130,
1483
2376
.arg = "STRING",
1484
2377
.doc = "GnuTLS priority string for the TLS handshake",
1489
2382
.group = 2 },
1490
2383
{ .name = "retry", .key = 132,
1491
2384
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
2385
.doc = "Retry interval used when denied by the Mandos server",
1493
2386
.group = 2 },
1494
2387
{ .name = "network-hook-dir", .key = 133,
1495
2388
.arg = "DIR",
1518
2411
connect_to = arg;
1519
2412
break;
1520
2413
case 'i': /* --interface */
1521
interface = arg;
2414
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2415
arg, (int)',');
2416
if(ret_errno != 0){
2417
argp_error(state, "%s", strerror(ret_errno));
2418
}
1522
2419
break;
1523
2420
case 's': /* --seckey */
1524
2421
seckey = arg;
1535
2432
}
1536
2433
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1537
2434
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
1538
2438
case 130: /* --priority */
1539
2439
mc.priority = arg;
1540
2440
break;
1567
2467
argp_state_help(state, state->out_stream,
1568
2468
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
2469
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
2470
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1572
2471
exit(argp_err_exit_status);
1573
2472
break;
1574
2473
default:
1581
2480
.args_doc = "",
1582
2481
.doc = "Mandos client -- Get and decrypt"
1583
2482
" passwords from a Mandos server" };
1584
ret = argp_parse(&argp, argc, argv,
1585
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1586
switch(ret){
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
1587
2486
case 0:
1588
2487
break;
1589
2488
case ENOMEM:
1590
2489
default:
1591
errno = ret;
2490
errno = ret_errno;
1592
2491
perror_plus("argp_parse");
1593
2492
exitcode = EX_OSERR;
1594
2493
goto end;
1597
2496
goto end;
1598
2497
}
1599
2498
}
1600
2499
1601
2500
{
1602
2501
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
2502
<https://bugs.debian.org/633582> */
2503
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2508
perror_plus("Failed to raise privileges");
1669
2509
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
1752
}
2510
struct stat st;
2511
2512
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2513
int seckey_fd = open(seckey, O_RDONLY);
2514
if(seckey_fd == -1){
2515
perror_plus("open");
2516
} else {
2517
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2518
if(ret == -1){
2519
perror_plus("fstat");
2520
} else {
2521
if(S_ISREG(st.st_mode)
2522
and st.st_uid == 0 and st.st_gid == 0){
2523
ret = fchown(seckey_fd, uid, gid);
2524
if(ret == -1){
2525
perror_plus("fchown");
2526
}
2527
}
2528
}
2529
close(seckey_fd);
2530
}
2531
}
2532
2533
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
int pubkey_fd = open(pubkey, O_RDONLY);
2535
if(pubkey_fd == -1){
2536
perror_plus("open");
2537
} else {
2538
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2539
if(ret == -1){
2540
perror_plus("fstat");
2541
} else {
2542
if(S_ISREG(st.st_mode)
2543
and st.st_uid == 0 and st.st_gid == 0){
2544
ret = fchown(pubkey_fd, uid, gid);
2545
if(ret == -1){
2546
perror_plus("fchown");
2547
}
2548
}
2549
}
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2573
}
2574
}
2575
2576
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2580
perror_plus("Failed to lower privileges");
2581
}
2582
}
2583
}
2584
2585
/* Remove invalid interface names (except "none") */
2586
{
2587
char *interface = NULL;
2588
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2589
interface))){
2590
if(strcmp(interface, "none") != 0
2591
and if_nametoindex(interface) == 0){
2592
if(interface[0] != '\0'){
2593
fprintf_plus(stderr, "Not using nonexisting interface"
2594
" \"%s\"\n", interface);
2595
}
2596
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2597
interface = NULL;
2598
}
2599
}
2600
}
2601
2602
/* Run network hooks */
2603
{
2604
if(mc.interfaces != NULL){
2605
interfaces_hooks = malloc(mc.interfaces_size);
2606
if(interfaces_hooks == NULL){
2607
perror_plus("malloc");
2608
goto end;
2609
}
2610
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2612
}
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
1753
2615
}
1754
2616
1755
2617
if(not debug){
1756
2618
avahi_set_log_function(empty_log);
1757
2619
}
1758
2620
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1789
goto end;
1790
}
1791
}
1792
1793
2621
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
2622
from the signal handler */
1795
2623
/* Initialize the pseudo-RNG for Avahi */
1796
2624
srand((unsigned int) time(NULL));
1797
mc.simple_poll = avahi_simple_poll_new();
1798
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
2625
simple_poll = avahi_simple_poll_new();
2626
if(simple_poll == NULL){
2627
fprintf_plus(stderr,
2628
"Avahi: Failed to create simple poll object.\n");
1801
2629
exitcode = EX_UNAVAILABLE;
1802
2630
goto end;
1803
2631
}
1865
2693
}
1866
2694
}
1867
2695
1868
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1875
goto end;
1876
}
1877
1878
if(quit_now){
1879
goto end;
1880
}
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
1889
#ifdef __linux__
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
1892
ret = klogctl(8, NULL, 5);
1893
bool restore_loglevel = true;
1894
if(ret == -1){
1895
restore_loglevel = false;
1896
perror_plus("klogctl");
1897
}
1898
#endif /* __linux__ */
1899
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
if(sd < 0){
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1904
#ifdef __linux__
1905
if(restore_loglevel){
1906
ret = klogctl(7, NULL, 0);
1907
if(ret == -1){
1908
perror_plus("klogctl");
1909
}
1910
}
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
1915
if(ret == -1){
1916
perror_plus("seteuid");
1917
}
1918
goto end;
1919
}
1920
strcpy(network.ifr_name, interface);
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
1936
if(ret == -1){
1937
perror_plus("seteuid");
1938
}
1939
goto end;
1940
}
1941
if((network.ifr_flags & IFF_UP) == 0){
1942
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
if(ret == -1){
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1949
#ifdef __linux__
1950
if(restore_loglevel){
1951
ret = klogctl(7, NULL, 0);
1952
if(ret == -1){
1953
perror_plus("klogctl");
2696
/* If no interfaces were specified, make a list */
2697
if(mc.interfaces == NULL){
2698
struct dirent **direntries = NULL;
2699
/* Look for any good interfaces */
2700
ret = scandir(sys_class_net, &direntries, good_interface,
2701
alphasort);
2702
if(ret >= 1){
2703
/* Add all found interfaces to interfaces list */
2704
for(int i = 0; i < ret; ++i){
2705
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2706
direntries[i]->d_name);
2707
if(ret_errno != 0){
2708
errno = ret_errno;
2709
perror_plus("argz_add");
2710
free(direntries[i]);
2711
continue;
2712
}
2713
if(debug){
2714
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
direntries[i]->d_name);
2716
}
2717
free(direntries[i]);
2718
}
2719
free(direntries);
2720
} else {
2721
if(ret == 0){
2722
free(direntries);
2723
}
2724
fprintf_plus(stderr, "Could not find a network interface\n");
2725
exitcode = EXIT_FAILURE;
2726
goto end;
2727
}
2728
}
2729
2730
/* Bring up interfaces which are down, and remove any "none"s */
2731
{
2732
char *interface = NULL;
2733
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2734
interface))){
2735
/* If interface name is "none", stop bringing up interfaces.
2736
Also remove all instances of "none" from the list */
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
interface);
2740
interface = NULL;
2741
while((interface = argz_next(mc.interfaces,
2742
mc.interfaces_size, interface))){
2743
if(strcmp(interface, "none") == 0){
2744
argz_delete(&mc.interfaces, &mc.interfaces_size,
2745
interface);
2746
interface = NULL;
1954
2747
}
1955
2748
}
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
1960
if(ret == -1){
1961
perror_plus("seteuid");
1962
}
1963
goto end;
1964
}
1965
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1968
for(int i=0; i < delay * 4; i++){
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1972
} else if(network.ifr_flags & IFF_RUNNING){
1973
2749
break;
1974
2750
}
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
ret = nanosleep(&sleeptime, NULL);
1977
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1979
}
1980
}
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
if(ret == -1){
1985
perror_plus("close");
1986
}
1987
}
1988
#ifdef __linux__
1989
if(restore_loglevel){
1990
/* Restores kernel loglevel to default */
1991
ret = klogctl(7, NULL, 0);
1992
if(ret == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
2751
bool interface_was_up = interface_is_up(interface);
2752
errno = bring_up_interface(interface, delay);
2753
if(not interface_was_up){
2754
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2757
} else {
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2760
interface);
2761
if(errno != 0){
2762
perror_plus("argz_add");
2763
}
2764
}
2765
}
2766
}
2767
if(debug and (interfaces_to_take_down == NULL)){
2768
fprintf_plus(stderr, "No interfaces were brought up\n");
2769
}
2770
}
2771
2772
/* If we only got one interface, explicitly use only that one */
2773
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2774
if(debug){
2775
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2776
mc.interfaces);
2777
}
2778
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2012
2779
}
2013
2780
2014
2781
if(quit_now){
2015
2782
goto end;
2016
2783
}
2017
2784
2018
ret = init_gnutls_global(pubkey, seckey);
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2019
2786
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
2022
2788
exitcode = EX_UNAVAILABLE;
2023
2789
goto end;
2024
2790
} else {
2029
2795
goto end;
2030
2796
}
2031
2797
2032
if(mkdtemp(tempdir) == NULL){
2798
/* Try /run/tmp before /tmp */
2799
tempdir = mkdtemp(run_tempdir);
2800
if(tempdir == NULL and errno == ENOENT){
2801
if(debug){
2802
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2803
run_tempdir, old_tempdir);
2804
}
2805
tempdir = mkdtemp(old_tempdir);
2806
}
2807
if(tempdir == NULL){
2033
2808
perror_plus("mkdtemp");
2034
2809
goto end;
2035
2810
}
2036
tempdir_created = true;
2037
2811
2038
2812
if(quit_now){
2039
2813
goto end;
2040
2814
}
2041
2815
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2816
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2817
fprintf_plus(stderr, "init_gpgme failed\n");
2045
2818
exitcode = EX_UNAVAILABLE;
2046
2819
goto end;
2047
2820
} else {
2056
2829
/* Connect directly, do not use Zeroconf */
2057
2830
/* (Mainly meant for debugging) */
2058
2831
char *address = strrchr(connect_to, ':');
2832
2059
2833
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2834
fprintf_plus(stderr, "No colon in address\n");
2062
2835
exitcode = EX_USAGE;
2063
2836
goto end;
2064
2837
}
2067
2840
goto end;
2068
2841
}
2069
2842
2070
uint16_t port;
2843
in_port_t port;
2071
2844
errno = 0;
2072
2845
tmpmax = strtoimax(address+1, &tmp, 10);
2073
2846
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2847
or tmpmax != (in_port_t)tmpmax){
2848
fprintf_plus(stderr, "Bad port number\n");
2077
2849
exitcode = EX_USAGE;
2078
2850
goto end;
2079
2851
}
2080
2852
2081
2853
if(quit_now){
2082
2854
goto end;
2083
2855
}
2084
2856
2085
port = (uint16_t)tmpmax;
2857
port = (in_port_t)tmpmax;
2086
2858
*address = '\0';
2087
2859
/* Colon in address indicates IPv6 */
2088
2860
int af;
2104
2876
}
2105
2877
2106
2878
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2879
ret = start_mandos_communication(address, port, if_index, af,
2880
&mc);
2108
2881
if(quit_now or ret == 0){
2109
2882
break;
2110
2883
}
2111
2884
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2885
fprintf_plus(stderr, "Retrying in %d seconds\n",
2886
(int)retry_interval);
2114
2887
}
2115
sleep((int)retry_interval);
2888
sleep((unsigned int)retry_interval);
2116
2889
}
2117
2890
2118
if (not quit_now){
2891
if(not quit_now){
2119
2892
exitcode = EXIT_SUCCESS;
2120
2893
}
2121
2894
2136
2909
config.publish_domain = 0;
2137
2910
2138
2911
/* Allocate a new server */
2139
mc.server = avahi_server_new(avahi_simple_poll_get
2140
(mc.simple_poll), &config, NULL,
2141
NULL, &error);
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2142
2914
2143
2915
/* Free the Avahi configuration data */
2144
2916
avahi_server_config_free(&config);
2146
2918
2147
2919
/* Check if creating the Avahi server object succeeded */
2148
2920
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
2151
avahi_strerror(error));
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2152
2923
exitcode = EX_UNAVAILABLE;
2153
2924
goto end;
2154
2925
}
2160
2931
/* Create the Avahi service browser */
2161
2932
sb = avahi_s_service_browser_new(mc.server, if_index,
2162
2933
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
NULL, 0, browse_callback, NULL);
2934
NULL, 0, browse_callback,
2935
(void *)&mc);
2164
2936
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
2167
avahi_strerror(avahi_server_errno(mc.server)));
2937
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2938
avahi_strerror(avahi_server_errno(mc.server)));
2168
2939
exitcode = EX_UNAVAILABLE;
2169
2940
goto end;
2170
2941
}
2176
2947
/* Run the main loop */
2177
2948
2178
2949
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2950
fprintf_plus(stderr, "Starting Avahi loop search\n");
2181
2951
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2952
2953
ret = avahi_loop_with_timeout(simple_poll,
2954
(int)(retry_interval * 1000), &mc);
2185
2955
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2956
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2957
(ret == 0) ? "successfully" : "with error");
2189
2958
}
2190
2959
2191
2960
end:
2192
2961
2193
2962
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2196
2970
}
2197
2971
2198
2972
/* Cleanup things */
2973
free(mc.interfaces);
2974
2199
2975
if(sb != NULL)
2200
2976
avahi_s_service_browser_free(sb);
2201
2977
2202
2978
if(mc.server != NULL)
2203
2979
avahi_server_free(mc.server);
2204
2980
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2981
if(simple_poll != NULL)
2982
avahi_simple_poll_free(simple_poll);
2207
2983
2208
2984
if(gnutls_initialized){
2209
2985
gnutls_certificate_free_credentials(mc.cred);
2210
gnutls_global_deinit();
2211
2986
gnutls_dh_params_deinit(mc.dh_params);
2212
2987
}
2213
2988
2214
2989
if(gpgme_initialized){
2215
2990
gpgme_release(mc.ctx);
2216
2991
}
2217
2992
2218
2993
/* Cleans up the circular linked list of Mandos servers the client
2219
2994
has seen */
2220
2995
if(mc.current_server != NULL){
2221
2996
mc.current_server->prev->next = NULL;
2222
2997
while(mc.current_server != NULL){
2223
2998
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
2224
3007
free(mc.current_server);
2225
3008
mc.current_server = next;
2226
3009
}
2227
3010
}
2228
3011
2229
/* XXX run network hooks "stop" here */
2230
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
if(geteuid() == 0){
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2248
}
2249
}
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
if(ret == -1){
2252
perror_plus("close");
2253
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2259
}
2260
}
3012
/* Re-raise privileges */
3013
{
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3017
perror_plus("Failed to raise privileges");
3018
} else {
3019
3020
/* Run network hooks */
3021
run_network_hooks("stop", interfaces_hooks != NULL ?
3022
interfaces_hooks : "", delay);
3023
3024
/* Take down the network interfaces which were brought up */
3025
{
3026
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
3033
perror_plus("Failed to take down interface");
3034
}
3035
}
3036
if(debug and (interfaces_to_take_down == NULL)){
3037
fprintf_plus(stderr, "No interfaces needed to be taken"
3038
" down\n");
3039
}
3040
}
3041
}
3042
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3046
perror_plus("Failed to lower privileges permanently");
3047
}
3048
}
3049
3050
free(interfaces_to_take_down);
3051
free(interfaces_hooks);
3052
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
2261
3107
}
2262
3108
2263
3109
/* Removes the GPGME temp directory and all files inside */
2264
if(tempdir_created){
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
direntry = direntries[i];
2272
char *fullname = NULL;
2273
ret = asprintf(&fullname, "%s/%s", tempdir,
2274
direntry->d_name);
2275
if(ret < 0){
2276
perror_plus("asprintf");
2277
continue;
2278
}
2279
ret = remove(fullname);
2280
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2283
}
2284
free(fullname);
2285
}
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
2292
}
2293
ret = rmdir(tempdir);
2294
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
2296
}
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2297
3112
}
2298
3113
2299
3114
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0