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» Revision
237.25.4
(compared to revision 237.16.2)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-05 18:36:23 UTC
- mto: (237.7.307 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150705183623-k7yokhi0wpvs61iw
Add plugin for mandos-client to add and delete local routes.
* Makefile (LIBNL3_CFLAGS, LIBNL3_LIBS): New; add for netlink library.
(PLUGIN_HELPERS): Add "plugin-helpers/mandos-client-iprouteadddel".
(plugin-helpers/mandos-client-iprouteadddel): New.
* plugin-helpers/mandos-client-iprouteadddel.c: New.
* plugins.d/mandos_client (add_remove_local_route): Rename
"remove_arg" to
"delete_arg". All
users changed.
* Makefile (LIBNL3_CFLAGS, LIBNL3_LIBS): New; add for netlink library.
(PLUGIN_HELPERS): Add "plugin-helpers/mandos-client-iprouteadddel".
(plugin-helpers/mandos-client-iprouteadddel): New.
* plugin-helpers/mandos-client-iprouteadddel.c: New.
* plugins.d/mandos_client (add_remove_local_route): Rename
"remove_arg" to
"delete_arg". All
users changed.
- files added:
- debian/mandos-client.examples
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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
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strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
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*/
62
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
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strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
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getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
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#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
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argp_state, struct argp,
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raise() */
86
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
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argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
88
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#ifdef __linux__
90
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#include <sys/klog.h> /* klogctl() */
108
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init_gnutls_session(),
109
119
GNUTLS_* */
110
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#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
113
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/* GPGME */
115
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#include <gpgme.h> /* All GPGME types, constants and
131
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const char *argp_program_bug_address = "<mandos@recompile.se>";
132
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static const char sys_class_net[] = "/sys/class/net";
133
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
134
148
135
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/* Doubly linked list that need to be circularly linked when used */
136
150
typedef struct server{
137
151
const char *ip;
138
uint16_t port;
152
in_port_t port;
139
153
AvahiIfIndex if_index;
140
154
int af;
141
155
struct timespec last_seen;
145
159
146
160
/* Used for passing in values through the Avahi callback functions */
147
161
typedef struct {
148
AvahiSimplePoll *simple_poll;
149
162
AvahiServer *server;
150
163
gnutls_certificate_credentials_t cred;
151
164
unsigned int dh_bits;
153
166
const char *priority;
154
167
gpgme_ctx_t ctx;
155
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
156
171
} mandos_context;
157
172
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
163
175
164
176
sig_atomic_t quit_now = 0;
165
177
int signal_received = 0;
166
178
167
179
/* Function to use when printing errors */
168
180
void perror_plus(const char *print_text){
181
int e = errno;
169
182
fprintf(stderr, "Mandos plugin %s: ",
170
183
program_invocation_short_name);
184
errno = e;
171
185
perror(print_text);
172
186
}
173
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
174
198
/*
175
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
200
* bytes. "buffer_capacity" is how much is currently allocated,
177
201
* "buffer_length" is how much is already used.
178
202
*/
203
__attribute__((nonnull, warn_unused_result))
179
204
size_t incbuffer(char **buffer, size_t buffer_length,
180
size_t buffer_capacity){
205
size_t buffer_capacity){
181
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
184
213
return 0;
185
214
}
215
*buffer = new_buf;
186
216
buffer_capacity += BUFFER_SIZE;
187
217
}
188
218
return buffer_capacity;
189
219
}
190
220
191
221
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
195
225
int ret;
196
226
server *new_server = malloc(sizeof(server));
197
227
if(new_server == NULL){
198
228
perror_plus("malloc");
199
return -1;
229
return false;
200
230
}
201
231
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
232
.port = port,
233
.if_index = if_index,
234
.af = af };
205
235
if(new_server->ip == NULL){
206
236
perror_plus("strdup");
207
return -1;
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
208
253
}
209
254
/* Special case of first server */
210
if (mc.current_server == NULL){
255
if(*current_server == NULL){
211
256
new_server->next = new_server;
212
257
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
258
*current_server = new_server;
215
259
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
218
263
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
227
267
}
228
268
229
269
/*
230
270
* Initialize GPGME.
231
271
*/
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
234
277
gpgme_error_t rc;
235
278
gpgme_engine_info_t engine_info;
236
279
237
238
280
/*
239
281
* Helper function to insert pub and seckey to the engine keyring.
240
282
*/
241
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
242
284
int ret;
243
285
int fd;
244
286
gpgme_data_t pgp_data;
251
293
252
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
295
if(rc != GPG_ERR_NO_ERROR){
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
256
298
return false;
257
299
}
258
300
259
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
260
302
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
263
305
return false;
264
306
}
265
307
272
314
}
273
315
274
316
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
276
318
}
277
319
278
320
/* Init GPGME */
279
321
gpgme_check_version(NULL);
280
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
281
323
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
284
326
return false;
285
327
}
286
328
287
329
/* Set GPGME home directory for the OpenPGP engine only */
288
330
rc = gpgme_get_engine_info(&engine_info);
289
331
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
292
334
return false;
293
335
}
294
336
while(engine_info != NULL){
300
342
engine_info = engine_info->next;
301
343
}
302
344
if(engine_info == NULL){
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
304
347
return false;
305
348
}
306
349
307
350
/* Create new GPGME "context" */
308
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
309
352
if(rc != GPG_ERR_NO_ERROR){
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
312
356
return false;
313
357
}
314
358
323
367
* Decrypt OpenPGP data.
324
368
* Returns -1 on error
325
369
*/
370
__attribute__((nonnull, warn_unused_result))
326
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
372
size_t crypto_size,
328
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
329
375
gpgme_data_t dh_crypto, dh_plain;
330
376
gpgme_error_t rc;
331
377
ssize_t ret;
333
379
ssize_t plaintext_length = 0;
334
380
335
381
if(debug){
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
337
383
}
338
384
339
385
/* Create new GPGME data buffer from memory cryptotext */
340
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
341
387
0);
342
388
if(rc != GPG_ERR_NO_ERROR){
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
345
391
return -1;
346
392
}
347
393
348
394
/* Create new empty GPGME data buffer for the plaintext */
349
395
rc = gpgme_data_new(&dh_plain);
350
396
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
353
400
gpgme_data_release(dh_crypto);
354
401
return -1;
355
402
}
356
403
357
404
/* Decrypt data from the cryptotext data buffer to the plaintext
358
405
data buffer */
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
360
407
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
363
410
plaintext_length = -1;
364
411
if(debug){
365
412
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
367
414
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
369
416
} else {
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
374
421
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
376
423
}
377
424
gpgme_recipient_t recipient;
378
425
recipient = result->recipients;
379
426
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
386
434
recipient = recipient->next;
387
435
}
388
436
}
391
439
}
392
440
393
441
if(debug){
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
395
443
}
396
444
397
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
404
452
*plaintext = NULL;
405
453
while(true){
406
454
plaintext_capacity = incbuffer(plaintext,
407
(size_t)plaintext_length,
408
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
409
457
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
413
461
}
414
462
415
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
428
476
}
429
477
430
478
if(debug){
431
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
432
480
for(ssize_t i = 0; i < plaintext_length; i++){
433
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
434
482
}
445
493
return plaintext_length;
446
494
}
447
495
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
451
499
if(ret == NULL)
452
500
ret = "(unknown)";
453
501
return ret;
454
502
}
455
503
456
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
457
506
static void debuggnutls(__attribute__((unused)) int level,
458
507
const char* string){
459
fprintf(stderr, "GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
460
509
}
461
510
511
__attribute__((nonnull, warn_unused_result))
462
512
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
464
515
int ret;
465
516
466
517
if(debug){
467
fprintf(stderr, "Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
468
519
}
469
520
470
521
ret = gnutls_global_init();
471
522
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
474
525
return -1;
475
526
}
476
527
483
534
}
484
535
485
536
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
487
538
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
490
541
gnutls_global_deinit();
491
542
return -1;
492
543
}
493
544
494
545
if(debug){
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
498
550
}
499
551
500
552
ret = gnutls_certificate_set_openpgp_key_file
501
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
502
554
GNUTLS_OPENPGP_FMT_BASE64);
503
555
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
509
561
goto globalfail;
510
562
}
511
563
512
564
/* GnuTLS server initialization */
513
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
514
566
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
517
570
goto globalfail;
518
571
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
520
573
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
523
576
goto globalfail;
524
577
}
525
578
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
527
580
528
581
return 0;
529
582
530
583
globalfail:
531
584
532
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
533
586
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
535
588
return -1;
536
589
}
537
590
538
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
539
594
int ret;
540
595
/* GnuTLS session creation */
541
596
do {
545
600
}
546
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
547
602
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
550
606
}
551
607
552
608
{
553
609
const char *err;
554
610
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
556
612
if(quit_now){
557
613
gnutls_deinit(*session);
558
614
return -1;
559
615
}
560
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
561
617
if(ret != GNUTLS_E_SUCCESS){
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
565
621
gnutls_deinit(*session);
566
622
return -1;
567
623
}
569
625
570
626
do {
571
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
628
mc->cred);
573
629
if(quit_now){
574
630
gnutls_deinit(*session);
575
631
return -1;
576
632
}
577
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
578
634
if(ret != GNUTLS_E_SUCCESS){
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
581
637
gnutls_deinit(*session);
582
638
return -1;
583
639
}
585
641
/* ignore client certificate if any. */
586
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
587
643
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
589
645
590
646
return 0;
591
647
}
594
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
595
651
__attribute__((unused)) const char *txt){}
596
652
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
716
if(debug){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
719
}
720
return false;
721
}
722
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
726
return false;
727
}
728
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
730
if(devnull == -1){
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
732
return false;
733
}
734
pid_t pid = fork();
735
if(pid == 0){
736
/* Child */
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
739
if(errno != 0){
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
742
} else {
743
/* Set group */
744
errno = 0;
745
ret = setgid(0);
746
if(ret == -1){
747
perror_plus("setgid");
748
_exit(EX_NOPERM);
749
}
750
/* Reset supplementary groups */
751
errno = 0;
752
ret = setgroups(0, NULL);
753
if(ret == -1){
754
perror_plus("setgroups");
755
_exit(EX_NOPERM);
756
}
757
}
758
ret = dup2(devnull, STDIN_FILENO);
759
if(ret == -1){
760
perror_plus("dup2(devnull, STDIN_FILENO)");
761
_exit(EX_OSERR);
762
}
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
764
if(ret == -1){
765
perror_plus("close");
766
_exit(EX_OSERR);
767
}
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
769
if(ret == -1){
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
771
_exit(EX_OSERR);
772
}
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
774
O_RDONLY
775
| O_DIRECTORY
776
| O_PATH
777
| O_CLOEXEC));
778
if(helperdir_fd == -1){
779
perror_plus("open");
780
_exit(EX_UNAVAILABLE);
781
}
782
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
783
helper, O_RDONLY));
784
if(helper_fd == -1){
785
perror_plus("openat");
786
_exit(EX_UNAVAILABLE);
787
}
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
789
#ifdef __GNUC__
790
#pragma GCC diagnostic push
791
#pragma GCC diagnostic ignored "-Wcast-qual"
792
#endif
793
if(fexecve(helper_fd, (char *const [])
794
{ helper, add ? add_arg : delete_arg, (char *)address,
795
interface, NULL }, environ) == -1){
796
#ifdef __GNUC__
797
#pragma GCC diagnostic pop
798
#endif
799
perror_plus("fexecve");
800
_exit(EXIT_FAILURE);
801
}
802
}
803
if(pid == -1){
804
perror_plus("fork");
805
return false;
806
}
807
int status;
808
pid_t pret = -1;
809
errno = 0;
810
do {
811
pret = waitpid(pid, &status, 0);
812
if(pret == -1 and errno == EINTR and quit_now){
813
int errno_raising = 0;
814
if((errno = raise_privileges()) != 0){
815
errno_raising = errno;
816
perror_plus("Failed to raise privileges in order to"
817
" kill helper program");
818
}
819
if(kill(pid, SIGTERM) == -1){
820
perror_plus("kill");
821
}
822
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
823
perror_plus("Failed to lower privileges after killing"
824
" helper program");
825
}
826
return false;
827
}
828
} while(pret == -1 and errno == EINTR);
829
if(pret == -1){
830
perror_plus("waitpid");
831
return false;
832
}
833
if(WIFEXITED(status)){
834
if(WEXITSTATUS(status) != 0){
835
fprintf_plus(stderr, "Error: iprouteadddel exited"
836
" with status %d\n", WEXITSTATUS(status));
837
return false;
838
}
839
return true;
840
}
841
if(WIFSIGNALED(status)){
842
fprintf_plus(stderr, "Error: iprouteadddel died by"
843
" signal %d\n", WTERMSIG(status));
844
return false;
845
}
846
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
847
return false;
848
}
849
850
__attribute__((nonnull, warn_unused_result))
851
static bool add_local_route(const char *address,
852
AvahiIfIndex if_index){
853
return add_remove_local_route(true, address, if_index);
854
}
855
856
__attribute__((nonnull, warn_unused_result))
857
static bool remove_local_route(const char *address,
858
AvahiIfIndex if_index){
859
return add_remove_local_route(false, address, if_index);
860
}
861
597
862
/* Called when a Mandos server is found */
598
static int start_mandos_communication(const char *ip, uint16_t port,
863
__attribute__((nonnull, warn_unused_result))
864
static int start_mandos_communication(const char *ip, in_port_t port,
599
865
AvahiIfIndex if_index,
600
int af){
866
int af, mandos_context *mc){
601
867
int ret, tcp_sd = -1;
602
868
ssize_t sret;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
869
struct sockaddr_storage to;
607
870
char *buffer = NULL;
608
871
char *decrypted_buffer = NULL;
609
872
size_t buffer_length = 0;
612
875
int retval = -1;
613
876
gnutls_session_t session;
614
877
int pf; /* Protocol family */
878
bool route_added = false;
615
879
616
880
errno = 0;
617
881
628
892
pf = PF_INET;
629
893
break;
630
894
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
895
fprintf_plus(stderr, "Bad address family: %d\n", af);
632
896
errno = EINVAL;
633
897
return -1;
634
898
}
635
899
636
ret = init_gnutls_session(&session);
900
/* If the interface is specified and we have a list of interfaces */
901
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
902
/* Check if the interface is one of the interfaces we are using */
903
bool match = false;
904
{
905
char *interface = NULL;
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
907
interface))){
908
if(if_nametoindex(interface) == (unsigned int)if_index){
909
match = true;
910
break;
911
}
912
}
913
}
914
if(not match){
915
/* This interface does not match any in the list, so we don't
916
connect to the server */
917
if(debug){
918
char interface[IF_NAMESIZE];
919
if(if_indextoname((unsigned int)if_index, interface) == NULL){
920
perror_plus("if_indextoname");
921
} else {
922
fprintf_plus(stderr, "Skipping server on non-used interface"
923
" \"%s\"\n",
924
if_indextoname((unsigned int)if_index,
925
interface));
926
}
927
}
928
return -1;
929
}
930
}
931
932
ret = init_gnutls_session(&session, mc);
637
933
if(ret != 0){
638
934
return -1;
639
935
}
640
936
641
937
if(debug){
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
938
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
939
PRIuMAX "\n", ip, (uintmax_t)port);
644
940
}
645
941
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
942
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
647
943
if(tcp_sd < 0){
648
944
int e = errno;
649
945
perror_plus("socket");
658
954
659
955
memset(&to, 0, sizeof(to));
660
956
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
663
959
} else { /* IPv4 */
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
666
962
}
667
963
if(ret < 0 ){
668
964
int e = errno;
672
968
}
673
969
if(ret == 0){
674
970
int e = errno;
675
fprintf(stderr, "Bad address: %s\n", ip);
971
fprintf_plus(stderr, "Bad address: %s\n", ip);
676
972
errno = e;
677
973
goto mandos_end;
678
974
}
679
975
if(af == AF_INET6){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
976
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
977
if(IN6_IS_ADDR_LINKLOCAL
978
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
687
979
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
980
fprintf_plus(stderr, "An IPv6 link-local address is"
981
" incomplete without a network interface\n");
690
982
errno = EINVAL;
691
983
goto mandos_end;
692
984
}
693
985
/* Set the network interface number as scope */
694
to.in6.sin6_scope_id = (uint32_t)if_index;
986
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
695
987
}
696
988
} else {
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
989
((struct sockaddr_in *)&to)->sin_port = htons(port);
700
990
}
701
991
702
992
if(quit_now){
710
1000
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
1001
perror_plus("if_indextoname");
712
1002
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
1003
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1004
"\n", ip, interface, (uintmax_t)port);
715
1005
}
716
1006
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
1007
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1008
ip, (uintmax_t)port);
719
1009
}
720
1010
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
1011
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
732
} else {
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
}
736
}
737
}
738
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
749
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
1012
if(af == AF_INET6){
1013
ret = getnameinfo((struct sockaddr *)&to,
1014
sizeof(struct sockaddr_in6),
1015
addrstr, sizeof(addrstr), NULL, 0,
1016
NI_NUMERICHOST);
1017
} else {
1018
ret = getnameinfo((struct sockaddr *)&to,
1019
sizeof(struct sockaddr_in),
1020
addrstr, sizeof(addrstr), NULL, 0,
1021
NI_NUMERICHOST);
1022
}
1023
if(ret == EAI_SYSTEM){
1024
perror_plus("getnameinfo");
1025
} else if(ret != 0) {
1026
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1027
} else if(strcmp(addrstr, ip) != 0){
1028
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1029
}
1030
}
1031
1032
if(quit_now){
1033
errno = EINTR;
1034
goto mandos_end;
1035
}
1036
1037
while(true){
1038
if(af == AF_INET6){
1039
ret = connect(tcp_sd, (struct sockaddr *)&to,
1040
sizeof(struct sockaddr_in6));
1041
} else {
1042
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1043
sizeof(struct sockaddr_in));
1044
}
1045
if(ret < 0){
1046
if(errno == ENETUNREACH
1047
and if_index != AVAHI_IF_UNSPEC
1048
and connect_to == NULL
1049
and not route_added and
1050
((af == AF_INET6 and not
1051
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1052
&to)->sin6_addr)))
1053
or (af == AF_INET and
1054
/* Not a a IPv4LL address */
1055
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1056
& 0xFFFF0000L) != 0xA9FE0000L))){
1057
/* Work around Avahi bug - Avahi does not announce link-local
1058
addresses if it has a global address, so local hosts with
1059
*only* a link-local address (e.g. Mandos clients) cannot
1060
connect to a Mandos server announced by Avahi on a server
1061
host with a global address. Work around this by retrying
1062
with an explicit route added with the server's address.
1063
1064
Avahi bug reference:
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1066
https://bugs.debian.org/587961
1067
*/
1068
int e = errno;
1069
route_added = add_local_route(ip, if_index);
1070
if(route_added){
1071
continue;
1072
}
1073
errno = e;
1074
}
1075
if(errno != ECONNREFUSED or debug){
1076
int e = errno;
1077
perror_plus("connect");
1078
errno = e;
1079
}
1080
goto mandos_end;
1081
}
1082
1083
if(quit_now){
1084
errno = EINTR;
1085
goto mandos_end;
1086
}
1087
break;
761
1088
}
762
1089
763
1090
const char *out = mandos_protocol_version;
765
1092
while(true){
766
1093
size_t out_size = strlen(out);
767
1094
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
out_size - written));
1095
out_size - written));
769
1096
if(ret == -1){
770
1097
int e = errno;
771
1098
perror_plus("write");
791
1118
}
792
1119
793
1120
if(debug){
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1121
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
795
1122
}
796
1123
797
1124
if(quit_now){
799
1126
goto mandos_end;
800
1127
}
801
1128
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1129
/* This casting via intptr_t is to eliminate warning about casting
1130
an int to a pointer type. This is exactly how the GnuTLS Guile
1131
function "set-session-transport-fd!" does it. */
1132
gnutls_transport_set_ptr(session,
1133
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
804
1134
805
1135
if(quit_now){
806
1136
errno = EINTR;
817
1147
818
1148
if(ret != GNUTLS_E_SUCCESS){
819
1149
if(debug){
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1150
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
821
1151
gnutls_perror(ret);
822
1152
}
823
1153
errno = EPROTO;
827
1157
/* Read OpenPGP packet that contains the wanted password */
828
1158
829
1159
if(debug){
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
1160
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1161
" %s\n", ip);
832
1162
}
833
1163
834
1164
while(true){
839
1169
}
840
1170
841
1171
buffer_capacity = incbuffer(&buffer, buffer_length,
842
buffer_capacity);
1172
buffer_capacity);
843
1173
if(buffer_capacity == 0){
844
1174
int e = errno;
845
1175
perror_plus("incbuffer");
872
1202
}
873
1203
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
1204
if(ret < 0){
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1205
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1206
"***\n");
876
1207
gnutls_perror(ret);
877
1208
errno = EPROTO;
878
1209
goto mandos_end;
879
1210
}
880
1211
break;
881
1212
default:
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
1213
fprintf_plus(stderr, "Unknown error while reading data from"
1214
" encrypted session with Mandos server\n");
884
1215
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
1216
errno = EIO;
886
1217
goto mandos_end;
891
1222
}
892
1223
893
1224
if(debug){
894
fprintf(stderr, "Closing TLS session\n");
1225
fprintf_plus(stderr, "Closing TLS session\n");
895
1226
}
896
1227
897
1228
if(quit_now){
909
1240
910
1241
if(buffer_length > 0){
911
1242
ssize_t decrypted_buffer_size;
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
1243
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1244
&decrypted_buffer, mc);
915
1245
if(decrypted_buffer_size >= 0){
916
1246
917
1247
written = 0;
927
1257
if(ret == 0 and ferror(stdout)){
928
1258
int e = errno;
929
1259
if(debug){
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1260
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1261
strerror(errno));
932
1262
}
933
1263
errno = e;
934
1264
goto mandos_end;
943
1273
944
1274
mandos_end:
945
1275
{
1276
if(route_added){
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1279
" interface %d", ip, if_index);
1280
}
1281
}
946
1282
int e = errno;
947
1283
free(decrypted_buffer);
948
1284
free(buffer);
965
1301
return retval;
966
1302
}
967
1303
1304
__attribute__((nonnull))
968
1305
static void resolve_callback(AvahiSServiceResolver *r,
969
1306
AvahiIfIndex interface,
970
1307
AvahiProtocol proto,
978
1315
AVAHI_GCC_UNUSED AvahiStringList *txt,
979
1316
AVAHI_GCC_UNUSED AvahiLookupResultFlags
980
1317
flags,
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1318
void *mc){
1319
if(r == NULL){
1320
return;
1321
}
983
1322
984
1323
/* Called whenever a service has been resolved successfully or
985
1324
timed out */
986
1325
987
1326
if(quit_now){
1327
avahi_s_service_resolver_free(r);
988
1328
return;
989
1329
}
990
1330
991
1331
switch(event){
992
1332
default:
993
1333
case AVAHI_RESOLVER_FAILURE:
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1334
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1335
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1336
domain,
1337
avahi_strerror(avahi_server_errno
1338
(((mandos_context*)mc)->server)));
997
1339
break;
998
1340
999
1341
case AVAHI_RESOLVER_FOUND:
1001
1343
char ip[AVAHI_ADDRESS_STR_MAX];
1002
1344
avahi_address_snprint(ip, sizeof(ip), address);
1003
1345
if(debug){
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1346
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1347
PRIdMAX ") on port %" PRIu16 "\n", name,
1348
host_name, ip, (intmax_t)interface, port);
1007
1349
}
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1350
int ret = start_mandos_communication(ip, (in_port_t)port,
1351
interface,
1352
avahi_proto_to_af(proto),
1353
mc);
1010
1354
if(ret == 0){
1011
avahi_simple_poll_quit(mc.simple_poll);
1355
avahi_simple_poll_quit(simple_poll);
1012
1356
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1357
if(not add_server(ip, (in_port_t)port, interface,
1358
avahi_proto_to_af(proto),
1359
&((mandos_context*)mc)->current_server)){
1360
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1361
" list\n", name);
1362
}
1015
1363
}
1016
1364
}
1017
1365
}
1027
1375
const char *domain,
1028
1376
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
1377
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1378
void *mc){
1379
if(b == NULL){
1380
return;
1381
}
1032
1382
1033
1383
/* Called whenever a new services becomes available on the LAN or
1034
1384
is removed from the LAN */
1041
1391
default:
1042
1392
case AVAHI_BROWSER_FAILURE:
1043
1393
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1394
fprintf_plus(stderr, "(Avahi browser) %s\n",
1395
avahi_strerror(avahi_server_errno
1396
(((mandos_context*)mc)->server)));
1397
avahi_simple_poll_quit(simple_poll);
1047
1398
return;
1048
1399
1049
1400
case AVAHI_BROWSER_NEW:
1052
1403
the callback function is called the Avahi server will free the
1053
1404
resolver for us. */
1054
1405
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1406
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1407
interface, protocol, name, type,
1408
domain, protocol, 0,
1409
resolve_callback, mc) == NULL)
1410
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1411
" %s\n", name,
1412
avahi_strerror(avahi_server_errno
1413
(((mandos_context*)mc)->server)));
1060
1414
break;
1061
1415
1062
1416
case AVAHI_BROWSER_REMOVE:
1065
1419
case AVAHI_BROWSER_ALL_FOR_NOW:
1066
1420
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1067
1421
if(debug){
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1422
fprintf_plus(stderr, "No Mandos server found, still"
1423
" searching...\n");
1069
1424
}
1070
1425
break;
1071
1426
}
1080
1435
signal_received = sig;
1081
1436
int old_errno = errno;
1082
1437
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1438
if(simple_poll != NULL){
1439
avahi_simple_poll_quit(simple_poll);
1085
1440
}
1086
1441
errno = old_errno;
1087
1442
}
1088
1443
1444
__attribute__((nonnull, warn_unused_result))
1089
1445
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
1446
int ret;
1447
error_t ret_errno;
1091
1448
1092
1449
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
1450
if(s < 0){
1451
ret_errno = errno;
1094
1452
perror_plus("socket");
1453
errno = ret_errno;
1095
1454
return false;
1096
1455
}
1097
1456
strcpy(ifr->ifr_name, ifname);
1098
1457
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
1458
if(ret == -1){
1100
1459
if(debug){
1460
ret_errno = errno;
1101
1461
perror_plus("ioctl SIOCGIFFLAGS");
1462
errno = ret_errno;
1102
1463
}
1103
1464
return false;
1104
1465
}
1105
1466
return true;
1106
1467
}
1107
1468
1469
__attribute__((nonnull, warn_unused_result))
1108
1470
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1471
1110
1472
/* Reject the loopback device */
1111
1473
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
1474
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1475
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1476
ifname);
1115
1477
}
1116
1478
return false;
1117
1479
}
1118
1480
/* Accept point-to-point devices only if connect_to is specified */
1119
1481
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
1482
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1483
fprintf_plus(stderr, "Accepting point-to-point interface"
1484
" \"%s\"\n", ifname);
1123
1485
}
1124
1486
return true;
1125
1487
}
1126
1488
/* Otherwise, reject non-broadcast-capable devices */
1127
1489
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
1490
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1491
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1492
" \"%s\"\n", ifname);
1131
1493
}
1132
1494
return false;
1133
1495
}
1134
1496
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
1497
if(ifr->ifr_flags & IFF_NOARP){
1136
1498
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1499
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1500
ifname);
1138
1501
}
1139
1502
return false;
1140
1503
}
1141
1504
1142
1505
/* Accept this device */
1143
1506
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1507
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1145
1508
}
1146
1509
return true;
1147
1510
}
1151
1514
* corresponds to an acceptable network device.
1152
1515
* (This function is passed to scandir(3) as a filter function.)
1153
1516
*/
1517
__attribute__((nonnull, warn_unused_result))
1154
1518
int good_interface(const struct dirent *if_entry){
1155
1519
if(if_entry->d_name[0] == '.'){
1156
1520
return 0;
1159
1523
struct ifreq ifr;
1160
1524
if(not get_flags(if_entry->d_name, &ifr)){
1161
1525
if(debug){
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1526
fprintf_plus(stderr, "Failed to get flags for interface "
1527
"\"%s\"\n", if_entry->d_name);
1528
}
1529
return 0;
1530
}
1531
1532
if(not good_flags(if_entry->d_name, &ifr)){
1533
return 0;
1534
}
1535
return 1;
1536
}
1537
1538
/*
1539
* This function determines if a network interface is up.
1540
*/
1541
__attribute__((nonnull, warn_unused_result))
1542
bool interface_is_up(const char *interface){
1543
struct ifreq ifr;
1544
if(not get_flags(interface, &ifr)){
1545
if(debug){
1546
fprintf_plus(stderr, "Failed to get flags for interface "
1547
"\"%s\"\n", interface);
1548
}
1549
return false;
1550
}
1551
1552
return (bool)(ifr.ifr_flags & IFF_UP);
1553
}
1554
1555
/*
1556
* This function determines if a network interface is running
1557
*/
1558
__attribute__((nonnull, warn_unused_result))
1559
bool interface_is_running(const char *interface){
1560
struct ifreq ifr;
1561
if(not get_flags(interface, &ifr)){
1562
if(debug){
1563
fprintf_plus(stderr, "Failed to get flags for interface "
1564
"\"%s\"\n", interface);
1565
}
1566
return false;
1567
}
1568
1569
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1570
}
1571
1572
__attribute__((nonnull, pure, warn_unused_result))
1217
1573
int notdotentries(const struct dirent *direntry){
1218
1574
/* Skip "." and ".." */
1219
1575
if(direntry->d_name[0] == '.'
1226
1582
}
1227
1583
1228
1584
/* Is this directory entry a runnable program? */
1585
__attribute__((nonnull, warn_unused_result))
1229
1586
int runnable_hook(const struct dirent *direntry){
1230
1587
int ret;
1588
size_t sret;
1231
1589
struct stat st;
1232
1590
1233
1591
if((direntry->d_name)[0] == '\0'){
1235
1593
return 0;
1236
1594
}
1237
1595
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1596
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1597
"abcdefghijklmnopqrstuvwxyz"
1598
"0123456789"
1599
"_.-");
1600
if((direntry->d_name)[sret] != '\0'){
1601
/* Contains non-allowed characters */
1602
if(debug){
1603
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1604
direntry->d_name);
1605
}
1606
return 0;
1607
}
1608
1609
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1255
1610
if(ret == -1){
1256
1611
if(debug){
1257
perror_plus("Could not stat plugin");
1612
perror_plus("Could not stat hook");
1258
1613
}
1259
1614
return 0;
1260
1615
}
1261
1616
if(not (S_ISREG(st.st_mode))){
1262
1617
/* Not a regular file */
1618
if(debug){
1619
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1620
direntry->d_name);
1621
}
1263
1622
return 0;
1264
1623
}
1265
1624
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1266
1625
/* Not executable */
1626
if(debug){
1627
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1628
direntry->d_name);
1629
}
1267
1630
return 0;
1268
1631
}
1632
if(debug){
1633
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1634
direntry->d_name);
1635
}
1269
1636
return 1;
1270
1637
}
1271
1638
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1639
__attribute__((nonnull, warn_unused_result))
1640
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1641
mandos_context *mc){
1273
1642
int ret;
1274
1643
struct timespec now;
1275
1644
struct timespec waited_time;
1276
1645
intmax_t block_time;
1277
1646
1278
1647
while(true){
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1648
if(mc->current_server == NULL){
1649
if(debug){
1650
fprintf_plus(stderr, "Wait until first server is found."
1651
" No timeout!\n");
1283
1652
}
1284
1653
ret = avahi_simple_poll_iterate(s, -1);
1285
1654
} else {
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1655
if(debug){
1656
fprintf_plus(stderr, "Check current_server if we should run"
1657
" it, or wait\n");
1289
1658
}
1290
1659
/* the current time */
1291
1660
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1296
1665
/* Calculating in ms how long time between now and server
1297
1666
who we visted longest time ago. Now - last seen. */
1298
1667
waited_time.tv_sec = (now.tv_sec
1299
- mc.current_server->last_seen.tv_sec);
1668
- mc->current_server->last_seen.tv_sec);
1300
1669
waited_time.tv_nsec = (now.tv_nsec
1301
- mc.current_server->last_seen.tv_nsec);
1670
- mc->current_server->last_seen.tv_nsec);
1302
1671
/* total time is 10s/10,000ms.
1303
1672
Converting to s from ms by dividing by 1,000,
1304
1673
and ns to ms by dividing by 1,000,000. */
1306
1675
- ((intmax_t)waited_time.tv_sec * 1000))
1307
1676
- ((intmax_t)waited_time.tv_nsec / 1000000));
1308
1677
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1678
if(debug){
1679
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1680
block_time);
1311
1681
}
1312
1682
1313
1683
if(block_time <= 0){
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1684
ret = start_mandos_communication(mc->current_server->ip,
1685
mc->current_server->port,
1686
mc->current_server->if_index,
1687
mc->current_server->af, mc);
1318
1688
if(ret == 0){
1319
avahi_simple_poll_quit(mc.simple_poll);
1689
avahi_simple_poll_quit(s);
1320
1690
return 0;
1321
1691
}
1322
1692
ret = clock_gettime(CLOCK_MONOTONIC,
1323
&mc.current_server->last_seen);
1693
&mc->current_server->last_seen);
1324
1694
if(ret == -1){
1325
1695
perror_plus("clock_gettime");
1326
1696
return -1;
1327
1697
}
1328
mc.current_server = mc.current_server->next;
1698
mc->current_server = mc->current_server->next;
1329
1699
block_time = 0; /* Call avahi to find new Mandos
1330
1700
servers, but don't block */
1331
1701
}
1333
1703
ret = avahi_simple_poll_iterate(s, (int)block_time);
1334
1704
}
1335
1705
if(ret != 0){
1336
if (ret > 0 or errno != EINTR) {
1706
if(ret > 0 or errno != EINTR){
1337
1707
return (ret != 1) ? ret : 0;
1338
1708
}
1339
1709
}
1340
1710
}
1341
1711
}
1342
1712
1713
__attribute__((nonnull))
1714
void run_network_hooks(const char *mode, const char *interface,
1715
const float delay){
1716
struct dirent **direntries = NULL;
1717
if(hookdir_fd == -1){
1718
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1719
| O_CLOEXEC);
1720
if(hookdir_fd == -1){
1721
if(errno == ENOENT){
1722
if(debug){
1723
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1724
" found\n", hookdir);
1725
}
1726
} else {
1727
perror_plus("open");
1728
}
1729
return;
1730
}
1731
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1735
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1738
alphasort);
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1742
alphasort);
1743
#endif /* not __GLIBC__ */
1744
if(numhooks == -1){
1745
perror_plus("scandir");
1746
return;
1747
}
1748
struct dirent *direntry;
1749
int ret;
1750
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1751
if(devnull == -1){
1752
perror_plus("open(\"/dev/null\", O_RDONLY)");
1753
return;
1754
}
1755
for(int i = 0; i < numhooks; i++){
1756
direntry = direntries[i];
1757
if(debug){
1758
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1759
direntry->d_name);
1760
}
1761
pid_t hook_pid = fork();
1762
if(hook_pid == 0){
1763
/* Child */
1764
/* Raise privileges */
1765
errno = raise_privileges_permanently();
1766
if(errno != 0){
1767
perror_plus("Failed to raise privileges");
1768
_exit(EX_NOPERM);
1769
}
1770
/* Set group */
1771
errno = 0;
1772
ret = setgid(0);
1773
if(ret == -1){
1774
perror_plus("setgid");
1775
_exit(EX_NOPERM);
1776
}
1777
/* Reset supplementary groups */
1778
errno = 0;
1779
ret = setgroups(0, NULL);
1780
if(ret == -1){
1781
perror_plus("setgroups");
1782
_exit(EX_NOPERM);
1783
}
1784
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1785
if(ret == -1){
1786
perror_plus("setenv");
1787
_exit(EX_OSERR);
1788
}
1789
ret = setenv("DEVICE", interface, 1);
1790
if(ret == -1){
1791
perror_plus("setenv");
1792
_exit(EX_OSERR);
1793
}
1794
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1795
if(ret == -1){
1796
perror_plus("setenv");
1797
_exit(EX_OSERR);
1798
}
1799
ret = setenv("MODE", mode, 1);
1800
if(ret == -1){
1801
perror_plus("setenv");
1802
_exit(EX_OSERR);
1803
}
1804
char *delaystring;
1805
ret = asprintf(&delaystring, "%f", (double)delay);
1806
if(ret == -1){
1807
perror_plus("asprintf");
1808
_exit(EX_OSERR);
1809
}
1810
ret = setenv("DELAY", delaystring, 1);
1811
if(ret == -1){
1812
free(delaystring);
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
free(delaystring);
1817
if(connect_to != NULL){
1818
ret = setenv("CONNECT", connect_to, 1);
1819
if(ret == -1){
1820
perror_plus("setenv");
1821
_exit(EX_OSERR);
1822
}
1823
}
1824
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1825
direntry->d_name,
1826
O_RDONLY));
1827
if(hook_fd == -1){
1828
perror_plus("openat");
1829
_exit(EXIT_FAILURE);
1830
}
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1832
perror_plus("close");
1833
_exit(EXIT_FAILURE);
1834
}
1835
ret = dup2(devnull, STDIN_FILENO);
1836
if(ret == -1){
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
1838
_exit(EX_OSERR);
1839
}
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1841
if(ret == -1){
1842
perror_plus("close");
1843
_exit(EX_OSERR);
1844
}
1845
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1846
if(ret == -1){
1847
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1848
_exit(EX_OSERR);
1849
}
1850
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1851
environ) == -1){
1852
perror_plus("fexecve");
1853
_exit(EXIT_FAILURE);
1854
}
1855
} else {
1856
if(hook_pid == -1){
1857
perror_plus("fork");
1858
free(direntry);
1859
continue;
1860
}
1861
int status;
1862
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1863
perror_plus("waitpid");
1864
free(direntry);
1865
continue;
1866
}
1867
if(WIFEXITED(status)){
1868
if(WEXITSTATUS(status) != 0){
1869
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1870
" with status %d\n", direntry->d_name,
1871
WEXITSTATUS(status));
1872
free(direntry);
1873
continue;
1874
}
1875
} else if(WIFSIGNALED(status)){
1876
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1877
" signal %d\n", direntry->d_name,
1878
WTERMSIG(status));
1879
free(direntry);
1880
continue;
1881
} else {
1882
fprintf_plus(stderr, "Warning: network hook \"%s\""
1883
" crashed\n", direntry->d_name);
1884
free(direntry);
1885
continue;
1886
}
1887
}
1888
if(debug){
1889
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1890
direntry->d_name);
1891
}
1892
free(direntry);
1893
}
1894
free(direntries);
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1896
perror_plus("close");
1897
} else {
1898
hookdir_fd = -1;
1899
}
1900
close(devnull);
1901
}
1902
1903
__attribute__((nonnull, warn_unused_result))
1904
error_t bring_up_interface(const char *const interface,
1905
const float delay){
1906
error_t old_errno = errno;
1907
int ret;
1908
struct ifreq network;
1909
unsigned int if_index = if_nametoindex(interface);
1910
if(if_index == 0){
1911
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1912
errno = old_errno;
1913
return ENXIO;
1914
}
1915
1916
if(quit_now){
1917
errno = old_errno;
1918
return EINTR;
1919
}
1920
1921
if(not interface_is_up(interface)){
1922
error_t ret_errno = 0, ioctl_errno = 0;
1923
if(not get_flags(interface, &network)){
1924
ret_errno = errno;
1925
fprintf_plus(stderr, "Failed to get flags for interface "
1926
"\"%s\"\n", interface);
1927
errno = old_errno;
1928
return ret_errno;
1929
}
1930
network.ifr_flags |= IFF_UP; /* set flag */
1931
1932
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd == -1){
1934
ret_errno = errno;
1935
perror_plus("socket");
1936
errno = old_errno;
1937
return ret_errno;
1938
}
1939
1940
if(quit_now){
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1942
if(ret == -1){
1943
perror_plus("close");
1944
}
1945
errno = old_errno;
1946
return EINTR;
1947
}
1948
1949
if(debug){
1950
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1951
interface);
1952
}
1953
1954
/* Raise privileges */
1955
ret_errno = raise_privileges();
1956
if(ret_errno != 0){
1957
errno = ret_errno;
1958
perror_plus("Failed to raise privileges");
1959
}
1960
1961
#ifdef __linux__
1962
int ret_linux;
1963
bool restore_loglevel = false;
1964
if(ret_errno == 0){
1965
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1966
messages about the network interface to mess up the prompt */
1967
ret_linux = klogctl(8, NULL, 5);
1968
if(ret_linux == -1){
1969
perror_plus("klogctl");
1970
} else {
1971
restore_loglevel = true;
1972
}
1973
}
1974
#endif /* __linux__ */
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
#ifdef __linux__
1978
if(restore_loglevel){
1979
ret_linux = klogctl(7, NULL, 0);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1982
}
1983
}
1984
#endif /* __linux__ */
1985
1986
/* If raise_privileges() succeeded above */
1987
if(ret_errno == 0){
1988
/* Lower privileges */
1989
ret_errno = lower_privileges();
1990
if(ret_errno != 0){
1991
errno = ret_errno;
1992
perror_plus("Failed to lower privileges");
1993
}
1994
}
1995
1996
/* Close the socket */
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1998
if(ret == -1){
1999
perror_plus("close");
2000
}
2001
2002
if(ret_setflags == -1){
2003
errno = ioctl_errno;
2004
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2005
errno = old_errno;
2006
return ioctl_errno;
2007
}
2008
} else if(debug){
2009
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2010
interface);
2011
}
2012
2013
/* Sleep checking until interface is running.
2014
Check every 0.25s, up to total time of delay */
2015
for(int i=0; i < delay * 4; i++){
2016
if(interface_is_running(interface)){
2017
break;
2018
}
2019
struct timespec sleeptime = { .tv_nsec = 250000000 };
2020
ret = nanosleep(&sleeptime, NULL);
2021
if(ret == -1 and errno != EINTR){
2022
perror_plus("nanosleep");
2023
}
2024
}
2025
2026
errno = old_errno;
2027
return 0;
2028
}
2029
2030
__attribute__((nonnull, warn_unused_result))
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2033
struct ifreq network;
2034
unsigned int if_index = if_nametoindex(interface);
2035
if(if_index == 0){
2036
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2037
errno = old_errno;
2038
return ENXIO;
2039
}
2040
if(interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network) and debug){
2043
ret_errno = errno;
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2046
errno = old_errno;
2047
return ret_errno;
2048
}
2049
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2050
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2052
if(sd == -1){
2053
ret_errno = errno;
2054
perror_plus("socket");
2055
errno = old_errno;
2056
return ret_errno;
2057
}
2058
2059
if(debug){
2060
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2061
interface);
2062
}
2063
2064
/* Raise privileges */
2065
ret_errno = raise_privileges();
2066
if(ret_errno != 0){
2067
errno = ret_errno;
2068
perror_plus("Failed to raise privileges");
2069
}
2070
2071
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2072
ioctl_errno = errno;
2073
2074
/* If raise_privileges() succeeded above */
2075
if(ret_errno == 0){
2076
/* Lower privileges */
2077
ret_errno = lower_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to lower privileges");
2081
}
2082
}
2083
2084
/* Close the socket */
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2086
if(ret == -1){
2087
perror_plus("close");
2088
}
2089
2090
if(ret_setflags == -1){
2091
errno = ioctl_errno;
2092
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2093
errno = old_errno;
2094
return ioctl_errno;
2095
}
2096
} else if(debug){
2097
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2098
interface);
2099
}
2100
2101
errno = old_errno;
2102
return 0;
2103
}
2104
1343
2105
int main(int argc, char *argv[]){
2106
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2107
.priority = "SECURE256:!CTYPE-X.509:"
2108
"+CTYPE-OPENPGP", .current_server = NULL,
2109
.interfaces = NULL, .interfaces_size = 0 };
1344
2110
AvahiSServiceBrowser *sb = NULL;
1345
int error;
2111
error_t ret_errno;
1346
2112
int ret;
1347
2113
intmax_t tmpmax;
1348
2114
char *tmp;
1349
2115
int exitcode = EXIT_SUCCESS;
1350
const char *interface = "";
1351
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
1354
uid_t uid;
1355
gid_t gid;
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1357
bool tempdir_created = false;
2116
char *interfaces_to_take_down = NULL;
2117
size_t interfaces_to_take_down_size = 0;
2118
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2119
char old_tempdir[] = "/tmp/mandosXXXXXX";
2120
char *tempdir = NULL;
1358
2121
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1359
2122
const char *seckey = PATHDIR "/" SECKEY;
1360
2123
const char *pubkey = PATHDIR "/" PUBKEY;
2124
char *interfaces_hooks = NULL;
1361
2125
1362
2126
bool gnutls_initialized = false;
1363
2127
bool gpgme_initialized = false;
1425
2189
.group = 2 },
1426
2190
{ .name = "retry", .key = 132,
1427
2191
.arg = "SECONDS",
1428
.doc = "Retry interval used when denied by the mandos server",
2192
.doc = "Retry interval used when denied by the Mandos server",
2193
.group = 2 },
2194
{ .name = "network-hook-dir", .key = 133,
2195
.arg = "DIR",
2196
.doc = "Directory where network hooks are located",
1429
2197
.group = 2 },
1430
2198
/*
1431
2199
* These reproduce what we would get without ARGP_NO_HELP
1450
2218
connect_to = arg;
1451
2219
break;
1452
2220
case 'i': /* --interface */
1453
interface = arg;
2221
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2222
arg, (int)',');
2223
if(ret_errno != 0){
2224
argp_error(state, "%s", strerror(ret_errno));
2225
}
1454
2226
break;
1455
2227
case 's': /* --seckey */
1456
2228
seckey = arg;
1485
2257
argp_error(state, "Bad retry interval");
1486
2258
}
1487
2259
break;
2260
case 133: /* --network-hook-dir */
2261
hookdir = arg;
2262
break;
1488
2263
/*
1489
2264
* These reproduce what we would get without ARGP_NO_HELP
1490
2265
*/
1496
2271
argp_state_help(state, state->out_stream,
1497
2272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1498
2273
case 'V': /* --version */
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
2274
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1500
2275
exit(argp_err_exit_status);
1501
2276
break;
1502
2277
default:
1525
2300
goto end;
1526
2301
}
1527
2302
}
1528
2303
1529
2304
{
1530
2305
/* Work around Debian bug #633582:
1531
2306
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
ret = setenv("DEVICE", interface, 1);
1612
if(ret == -1){
1613
perror_plus("setenv");
1614
exit(1);
1615
}
1616
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1617
if(ret == -1){
1618
perror_plus("setenv");
1619
exit(1);
1620
}
1621
ret = setenv("MODE", "start", 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
exit(1);
1625
}
1626
char *delaystring;
1627
ret = asprintf(&delaystring, "%f", delay);
1628
if(ret == -1){
1629
perror_plus("asprintf");
1630
exit(1);
1631
}
1632
ret = setenv("DELAY", delaystring, 1);
1633
if(ret == -1){
1634
free(delaystring);
1635
perror_plus("setenv");
1636
exit(1);
1637
}
1638
free(delaystring);
1639
ret = execl(fullname, direntry->d_name, "start", NULL);
1640
perror_plus("execl");
1641
}
1642
free(fullname);
1643
if(quit_now){
2307
2308
/* Re-raise privileges */
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2312
perror_plus("Failed to raise privileges");
2313
} else {
2314
struct stat st;
2315
2316
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2317
int seckey_fd = open(seckey, O_RDONLY);
2318
if(seckey_fd == -1){
2319
perror_plus("open");
2320
} else {
2321
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2322
if(ret == -1){
2323
perror_plus("fstat");
2324
} else {
2325
if(S_ISREG(st.st_mode)
2326
and st.st_uid == 0 and st.st_gid == 0){
2327
ret = fchown(seckey_fd, uid, gid);
2328
if(ret == -1){
2329
perror_plus("fchown");
2330
}
2331
}
2332
}
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2334
}
2335
}
2336
2337
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2338
int pubkey_fd = open(pubkey, O_RDONLY);
2339
if(pubkey_fd == -1){
2340
perror_plus("open");
2341
} else {
2342
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2343
if(ret == -1){
2344
perror_plus("fstat");
2345
} else {
2346
if(S_ISREG(st.st_mode)
2347
and st.st_uid == 0 and st.st_gid == 0){
2348
ret = fchown(pubkey_fd, uid, gid);
2349
if(ret == -1){
2350
perror_plus("fchown");
2351
}
2352
}
2353
}
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2355
}
2356
}
2357
2358
/* Lower privileges */
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2362
perror_plus("Failed to lower privileges");
2363
}
2364
}
2365
}
2366
2367
/* Remove invalid interface names (except "none") */
2368
{
2369
char *interface = NULL;
2370
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2371
interface))){
2372
if(strcmp(interface, "none") != 0
2373
and if_nametoindex(interface) == 0){
2374
if(interface[0] != '\0'){
2375
fprintf_plus(stderr, "Not using nonexisting interface"
2376
" \"%s\"\n", interface);
2377
}
2378
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2379
interface = NULL;
2380
}
2381
}
2382
}
2383
2384
/* Run network hooks */
2385
{
2386
if(mc.interfaces != NULL){
2387
interfaces_hooks = malloc(mc.interfaces_size);
2388
if(interfaces_hooks == NULL){
2389
perror_plus("malloc");
1644
2390
goto end;
1645
2391
}
2392
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2393
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1646
2394
}
1647
close(devnull);
2395
run_network_hooks("start", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
1648
2397
}
1649
2398
1650
2399
if(not debug){
1651
2400
avahi_set_log_function(empty_log);
1652
2401
}
1653
2402
1654
if(interface[0] == '\0'){
1655
struct dirent **direntries;
1656
/* First look for interfaces that are up */
1657
ret = scandir(sys_class_net, &direntries, up_interface,
1658
alphasort);
1659
if(ret == 0){
1660
/* No up interfaces, look for any good interfaces */
1661
free(direntries);
1662
ret = scandir(sys_class_net, &direntries, good_interface,
1663
alphasort);
1664
}
1665
if(ret >= 1){
1666
/* Pick the first interface returned */
1667
interface = strdup(direntries[0]->d_name);
1668
if(debug){
1669
fprintf(stderr, "Using interface \"%s\"\n", interface);
1670
}
1671
if(interface == NULL){
1672
perror_plus("malloc");
1673
free(direntries);
1674
exitcode = EXIT_FAILURE;
1675
goto end;
1676
}
1677
free(direntries);
1678
} else {
1679
free(direntries);
1680
fprintf(stderr, "Could not find a network interface\n");
1681
exitcode = EXIT_FAILURE;
1682
goto end;
1683
}
1684
}
1685
1686
2403
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1687
2404
from the signal handler */
1688
2405
/* Initialize the pseudo-RNG for Avahi */
1689
2406
srand((unsigned int) time(NULL));
1690
mc.simple_poll = avahi_simple_poll_new();
1691
if(mc.simple_poll == NULL){
1692
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2407
simple_poll = avahi_simple_poll_new();
2408
if(simple_poll == NULL){
2409
fprintf_plus(stderr,
2410
"Avahi: Failed to create simple poll object.\n");
1693
2411
exitcode = EX_UNAVAILABLE;
1694
2412
goto end;
1695
2413
}
1757
2475
}
1758
2476
}
1759
2477
1760
/* If the interface is down, bring it up */
1761
if(strcmp(interface, "none") != 0){
1762
if_index = (AvahiIfIndex) if_nametoindex(interface);
1763
if(if_index == 0){
1764
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1765
exitcode = EX_UNAVAILABLE;
1766
goto end;
1767
}
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
/* Re-raise priviliges */
1774
errno = 0;
1775
ret = seteuid(0);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
1780
#ifdef __linux__
1781
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1782
messages about the network interface to mess up the prompt */
1783
ret = klogctl(8, NULL, 5);
1784
bool restore_loglevel = true;
1785
if(ret == -1){
1786
restore_loglevel = false;
1787
perror_plus("klogctl");
1788
}
1789
#endif /* __linux__ */
1790
1791
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1792
if(sd < 0){
1793
perror_plus("socket");
1794
exitcode = EX_OSERR;
1795
#ifdef __linux__
1796
if(restore_loglevel){
1797
ret = klogctl(7, NULL, 0);
1798
if(ret == -1){
1799
perror_plus("klogctl");
1800
}
1801
}
1802
#endif /* __linux__ */
1803
/* Lower privileges */
1804
errno = 0;
1805
ret = seteuid(uid);
1806
if(ret == -1){
1807
perror_plus("seteuid");
1808
}
1809
goto end;
1810
}
1811
strcpy(network.ifr_name, interface);
1812
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1813
if(ret == -1){
1814
perror_plus("ioctl SIOCGIFFLAGS");
1815
#ifdef __linux__
1816
if(restore_loglevel){
1817
ret = klogctl(7, NULL, 0);
1818
if(ret == -1){
1819
perror_plus("klogctl");
1820
}
1821
}
1822
#endif /* __linux__ */
1823
exitcode = EX_OSERR;
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
if((network.ifr_flags & IFF_UP) == 0){
1833
network.ifr_flags |= IFF_UP;
1834
take_down_interface = true;
1835
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1836
if(ret == -1){
1837
take_down_interface = false;
1838
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1839
exitcode = EX_OSERR;
1840
#ifdef __linux__
1841
if(restore_loglevel){
1842
ret = klogctl(7, NULL, 0);
1843
if(ret == -1){
1844
perror_plus("klogctl");
2478
/* If no interfaces were specified, make a list */
2479
if(mc.interfaces == NULL){
2480
struct dirent **direntries = NULL;
2481
/* Look for any good interfaces */
2482
ret = scandir(sys_class_net, &direntries, good_interface,
2483
alphasort);
2484
if(ret >= 1){
2485
/* Add all found interfaces to interfaces list */
2486
for(int i = 0; i < ret; ++i){
2487
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2488
direntries[i]->d_name);
2489
if(ret_errno != 0){
2490
errno = ret_errno;
2491
perror_plus("argz_add");
2492
free(direntries[i]);
2493
continue;
2494
}
2495
if(debug){
2496
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2497
direntries[i]->d_name);
2498
}
2499
free(direntries[i]);
2500
}
2501
free(direntries);
2502
} else {
2503
if(ret == 0){
2504
free(direntries);
2505
}
2506
fprintf_plus(stderr, "Could not find a network interface\n");
2507
exitcode = EXIT_FAILURE;
2508
goto end;
2509
}
2510
}
2511
2512
/* Bring up interfaces which are down, and remove any "none"s */
2513
{
2514
char *interface = NULL;
2515
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2516
interface))){
2517
/* If interface name is "none", stop bringing up interfaces.
2518
Also remove all instances of "none" from the list */
2519
if(strcmp(interface, "none") == 0){
2520
argz_delete(&mc.interfaces, &mc.interfaces_size,
2521
interface);
2522
interface = NULL;
2523
while((interface = argz_next(mc.interfaces,
2524
mc.interfaces_size, interface))){
2525
if(strcmp(interface, "none") == 0){
2526
argz_delete(&mc.interfaces, &mc.interfaces_size,
2527
interface);
2528
interface = NULL;
1845
2529
}
1846
2530
}
1847
#endif /* __linux__ */
1848
/* Lower privileges */
1849
errno = 0;
1850
ret = seteuid(uid);
1851
if(ret == -1){
1852
perror_plus("seteuid");
1853
}
1854
goto end;
1855
}
1856
}
1857
/* Sleep checking until interface is running.
1858
Check every 0.25s, up to total time of delay */
1859
for(int i=0; i < delay * 4; i++){
1860
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1861
if(ret == -1){
1862
perror_plus("ioctl SIOCGIFFLAGS");
1863
} else if(network.ifr_flags & IFF_RUNNING){
1864
2531
break;
1865
2532
}
1866
struct timespec sleeptime = { .tv_nsec = 250000000 };
1867
ret = nanosleep(&sleeptime, NULL);
1868
if(ret == -1 and errno != EINTR){
1869
perror_plus("nanosleep");
1870
}
1871
}
1872
if(not take_down_interface){
1873
/* We won't need the socket anymore */
1874
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1875
if(ret == -1){
1876
perror_plus("close");
1877
}
1878
}
1879
#ifdef __linux__
1880
if(restore_loglevel){
1881
/* Restores kernel loglevel to default */
1882
ret = klogctl(7, NULL, 0);
1883
if(ret == -1){
1884
perror_plus("klogctl");
1885
}
1886
}
1887
#endif /* __linux__ */
1888
/* Lower privileges */
1889
errno = 0;
1890
if(take_down_interface){
1891
/* Lower privileges */
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
} else {
1897
/* Lower privileges permanently */
1898
ret = setuid(uid);
1899
if(ret == -1){
1900
perror_plus("setuid");
1901
}
1902
}
2533
bool interface_was_up = interface_is_up(interface);
2534
errno = bring_up_interface(interface, delay);
2535
if(not interface_was_up){
2536
if(errno != 0){
2537
perror_plus("Failed to bring up interface");
2538
} else {
2539
errno = argz_add(&interfaces_to_take_down,
2540
&interfaces_to_take_down_size,
2541
interface);
2542
if(errno != 0){
2543
perror_plus("argz_add");
2544
}
2545
}
2546
}
2547
}
2548
if(debug and (interfaces_to_take_down == NULL)){
2549
fprintf_plus(stderr, "No interfaces were brought up\n");
2550
}
2551
}
2552
2553
/* If we only got one interface, explicitly use only that one */
2554
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2555
if(debug){
2556
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2557
mc.interfaces);
2558
}
2559
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1903
2560
}
1904
2561
1905
2562
if(quit_now){
1906
2563
goto end;
1907
2564
}
1908
2565
1909
ret = init_gnutls_global(pubkey, seckey);
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
1910
2567
if(ret == -1){
1911
fprintf(stderr, "init_gnutls_global failed\n");
2568
fprintf_plus(stderr, "init_gnutls_global failed\n");
1912
2569
exitcode = EX_UNAVAILABLE;
1913
2570
goto end;
1914
2571
} else {
1919
2576
goto end;
1920
2577
}
1921
2578
1922
if(mkdtemp(tempdir) == NULL){
2579
/* Try /run/tmp before /tmp */
2580
tempdir = mkdtemp(run_tempdir);
2581
if(tempdir == NULL and errno == ENOENT){
2582
if(debug){
2583
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2584
run_tempdir, old_tempdir);
2585
}
2586
tempdir = mkdtemp(old_tempdir);
2587
}
2588
if(tempdir == NULL){
1923
2589
perror_plus("mkdtemp");
1924
2590
goto end;
1925
2591
}
1926
tempdir_created = true;
1927
2592
1928
2593
if(quit_now){
1929
2594
goto end;
1930
2595
}
1931
2596
1932
if(not init_gpgme(pubkey, seckey, tempdir)){
1933
fprintf(stderr, "init_gpgme failed\n");
2597
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2598
fprintf_plus(stderr, "init_gpgme failed\n");
1934
2599
exitcode = EX_UNAVAILABLE;
1935
2600
goto end;
1936
2601
} else {
1945
2610
/* Connect directly, do not use Zeroconf */
1946
2611
/* (Mainly meant for debugging) */
1947
2612
char *address = strrchr(connect_to, ':');
2613
1948
2614
if(address == NULL){
1949
fprintf(stderr, "No colon in address\n");
2615
fprintf_plus(stderr, "No colon in address\n");
1950
2616
exitcode = EX_USAGE;
1951
2617
goto end;
1952
2618
}
1955
2621
goto end;
1956
2622
}
1957
2623
1958
uint16_t port;
2624
in_port_t port;
1959
2625
errno = 0;
1960
2626
tmpmax = strtoimax(address+1, &tmp, 10);
1961
2627
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1962
or tmpmax != (uint16_t)tmpmax){
1963
fprintf(stderr, "Bad port number\n");
2628
or tmpmax != (in_port_t)tmpmax){
2629
fprintf_plus(stderr, "Bad port number\n");
1964
2630
exitcode = EX_USAGE;
1965
2631
goto end;
1966
2632
}
1967
2633
1968
2634
if(quit_now){
1969
2635
goto end;
1970
2636
}
1971
2637
1972
port = (uint16_t)tmpmax;
2638
port = (in_port_t)tmpmax;
1973
2639
*address = '\0';
1974
2640
/* Colon in address indicates IPv6 */
1975
2641
int af;
1991
2657
}
1992
2658
1993
2659
while(not quit_now){
1994
ret = start_mandos_communication(address, port, if_index, af);
2660
ret = start_mandos_communication(address, port, if_index, af,
2661
&mc);
1995
2662
if(quit_now or ret == 0){
1996
2663
break;
1997
2664
}
1998
2665
if(debug){
1999
fprintf(stderr, "Retrying in %d seconds\n",
2000
(int)retry_interval);
2666
fprintf_plus(stderr, "Retrying in %d seconds\n",
2667
(int)retry_interval);
2001
2668
}
2002
sleep((int)retry_interval);
2669
sleep((unsigned int)retry_interval);
2003
2670
}
2004
2671
2005
if (not quit_now){
2672
if(not quit_now){
2006
2673
exitcode = EXIT_SUCCESS;
2007
2674
}
2008
2675
2023
2690
config.publish_domain = 0;
2024
2691
2025
2692
/* Allocate a new server */
2026
mc.server = avahi_server_new(avahi_simple_poll_get
2027
(mc.simple_poll), &config, NULL,
2028
NULL, &error);
2693
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2694
&config, NULL, NULL, &ret_errno);
2029
2695
2030
2696
/* Free the Avahi configuration data */
2031
2697
avahi_server_config_free(&config);
2033
2699
2034
2700
/* Check if creating the Avahi server object succeeded */
2035
2701
if(mc.server == NULL){
2036
fprintf(stderr, "Failed to create Avahi server: %s\n",
2037
avahi_strerror(error));
2702
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2703
avahi_strerror(ret_errno));
2038
2704
exitcode = EX_UNAVAILABLE;
2039
2705
goto end;
2040
2706
}
2046
2712
/* Create the Avahi service browser */
2047
2713
sb = avahi_s_service_browser_new(mc.server, if_index,
2048
2714
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2049
NULL, 0, browse_callback, NULL);
2715
NULL, 0, browse_callback,
2716
(void *)&mc);
2050
2717
if(sb == NULL){
2051
fprintf(stderr, "Failed to create service browser: %s\n",
2052
avahi_strerror(avahi_server_errno(mc.server)));
2718
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2719
avahi_strerror(avahi_server_errno(mc.server)));
2053
2720
exitcode = EX_UNAVAILABLE;
2054
2721
goto end;
2055
2722
}
2061
2728
/* Run the main loop */
2062
2729
2063
2730
if(debug){
2064
fprintf(stderr, "Starting Avahi loop search\n");
2731
fprintf_plus(stderr, "Starting Avahi loop search\n");
2065
2732
}
2066
2067
ret = avahi_loop_with_timeout(mc.simple_poll,
2068
(int)(retry_interval * 1000));
2733
2734
ret = avahi_loop_with_timeout(simple_poll,
2735
(int)(retry_interval * 1000), &mc);
2069
2736
if(debug){
2070
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2071
(ret == 0) ? "successfully" : "with error");
2737
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2738
(ret == 0) ? "successfully" : "with error");
2072
2739
}
2073
2740
2074
2741
end:
2075
2742
2076
2743
if(debug){
2077
fprintf(stderr, "%s exiting\n", argv[0]);
2744
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2078
2745
}
2079
2746
2080
2747
/* Cleanup things */
2748
free(mc.interfaces);
2749
2081
2750
if(sb != NULL)
2082
2751
avahi_s_service_browser_free(sb);
2083
2752
2084
2753
if(mc.server != NULL)
2085
2754
avahi_server_free(mc.server);
2086
2755
2087
if(mc.simple_poll != NULL)
2088
avahi_simple_poll_free(mc.simple_poll);
2756
if(simple_poll != NULL)
2757
avahi_simple_poll_free(simple_poll);
2089
2758
2090
2759
if(gnutls_initialized){
2091
2760
gnutls_certificate_free_credentials(mc.cred);
2096
2765
if(gpgme_initialized){
2097
2766
gpgme_release(mc.ctx);
2098
2767
}
2099
2768
2100
2769
/* Cleans up the circular linked list of Mandos servers the client
2101
2770
has seen */
2102
2771
if(mc.current_server != NULL){
2103
2772
mc.current_server->prev->next = NULL;
2104
2773
while(mc.current_server != NULL){
2105
2774
server *next = mc.current_server->next;
2775
#ifdef __GNUC__
2776
#pragma GCC diagnostic push
2777
#pragma GCC diagnostic ignored "-Wcast-qual"
2778
#endif
2779
free((char *)(mc.current_server->ip));
2780
#ifdef __GNUC__
2781
#pragma GCC diagnostic pop
2782
#endif
2106
2783
free(mc.current_server);
2107
2784
mc.current_server = next;
2108
2785
}
2109
2786
}
2110
2787
2111
/* XXX run network hooks "stop" here */
2112
2113
/* Take down the network interface */
2114
if(take_down_interface){
2115
/* Re-raise priviliges */
2116
errno = 0;
2117
ret = seteuid(0);
2118
if(ret == -1){
2119
perror_plus("seteuid");
2788
/* Re-raise privileges */
2789
{
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
2793
perror_plus("Failed to raise privileges");
2794
} else {
2795
2796
/* Run network hooks */
2797
run_network_hooks("stop", interfaces_hooks != NULL ?
2798
interfaces_hooks : "", delay);
2799
2800
/* Take down the network interfaces which were brought up */
2801
{
2802
char *interface = NULL;
2803
while((interface=argz_next(interfaces_to_take_down,
2804
interfaces_to_take_down_size,
2805
interface))){
2806
ret_errno = take_down_interface(interface);
2807
if(ret_errno != 0){
2808
errno = ret_errno;
2809
perror_plus("Failed to take down interface");
2810
}
2811
}
2812
if(debug and (interfaces_to_take_down == NULL)){
2813
fprintf_plus(stderr, "No interfaces needed to be taken"
2814
" down\n");
2815
}
2816
}
2120
2817
}
2121
if(geteuid() == 0){
2122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2123
if(ret == -1){
2124
perror_plus("ioctl SIOCGIFFLAGS");
2125
} else if(network.ifr_flags & IFF_UP) {
2126
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2127
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2128
if(ret == -1){
2129
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2130
}
2131
}
2132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2133
if(ret == -1){
2134
perror_plus("close");
2135
}
2136
/* Lower privileges permanently */
2137
errno = 0;
2138
ret = setuid(uid);
2139
if(ret == -1){
2140
perror_plus("setuid");
2141
}
2818
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
2822
perror_plus("Failed to lower privileges permanently");
2142
2823
}
2143
2824
}
2144
2825
2826
free(interfaces_to_take_down);
2827
free(interfaces_hooks);
2828
2145
2829
/* Removes the GPGME temp directory and all files inside */
2146
if(tempdir_created){
2830
if(tempdir != NULL){
2147
2831
struct dirent **direntries = NULL;
2148
struct dirent *direntry = NULL;
2149
int numentries = scandir(tempdir, &direntries, notdotentries,
2150
alphasort);
2151
if (numentries > 0){
2152
for(int i = 0; i < numentries; i++){
2153
direntry = direntries[i];
2154
char *fullname = NULL;
2155
ret = asprintf(&fullname, "%s/%s", tempdir,
2156
direntry->d_name);
2157
if(ret < 0){
2158
perror_plus("asprintf");
2159
continue;
2160
}
2161
ret = remove(fullname);
2162
if(ret == -1){
2163
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2164
strerror(errno));
2165
}
2166
free(fullname);
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2833
| O_NOFOLLOW
2834
| O_DIRECTORY
2835
| O_PATH));
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2838
} else {
2839
#ifdef __GLIBC__
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2845
alphasort);
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2849
alphasort);
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2854
if(ret == -1){
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2858
}
2859
free(direntries[i]);
2860
}
2861
2862
/* need to clean even if 0 because man page doesn't specify */
2863
free(direntries);
2864
if(numentries == -1){
2865
perror_plus("scandir");
2866
}
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2870
}
2167
2871
}
2168
}
2169
2170
/* need to clean even if 0 because man page doesn't specify */
2171
free(direntries);
2172
if (numentries == -1){
2173
perror_plus("scandir");
2174
}
2175
ret = rmdir(tempdir);
2176
if(ret == -1 and errno != ENOENT){
2177
perror_plus("rmdir");
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));
2178
2873
}
2179
2874
}
2180
2875
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0