(root)/mandos/release
» Revision
237.7.301
(compared to revision 237.15.4)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-05-31 16:13:39 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150531161339-igb3l0ip3c10ejpz
mandos-ctl: Generate better messages in exceptions.
mandos (rfc3339_duration_to_delta): Remove dead code. Adjust white
space.
mandos-ctl (rfc3339_duration_to_delta): Do minor formatting and
whitespace adjustments, and
Generate better message in
exception.
(string_to_delta): Adjust quote character in doc string.
mandos (rfc3339_duration_to_delta): Remove dead code. Adjust white
space.
mandos-ctl (rfc3339_duration_to_delta): Do minor formatting and
whitespace adjustments, and
Generate better message in
exception.
(string_to_delta): Adjust quote character in doc string.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#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
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
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
75
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
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
85
86
raise() */
86
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
88
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(),
93
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
98
89
99
#ifdef __linux__
90
100
#include <sys/klog.h> /* klogctl() */
108
118
init_gnutls_session(),
109
119
GNUTLS_* */
110
120
#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
123
114
124
/* GPGME */
115
125
#include <gpgme.h> /* All GPGME types, constants and
131
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
142
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
149
/* 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))
174
189
int fprintf_plus(FILE *stream, const char *format, ...){
175
190
va_list ap;
176
191
va_start (ap, format);
177
192
178
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
179
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
180
196
}
181
197
182
198
/*
184
200
* bytes. "buffer_capacity" is how much is currently allocated,
185
201
* "buffer_length" is how much is already used.
186
202
*/
203
__attribute__((nonnull, warn_unused_result))
187
204
size_t incbuffer(char **buffer, size_t buffer_length,
188
size_t buffer_capacity){
205
size_t buffer_capacity){
189
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
190
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
191
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;
192
213
return 0;
193
214
}
215
*buffer = new_buf;
194
216
buffer_capacity += BUFFER_SIZE;
195
217
}
196
218
return buffer_capacity;
197
219
}
198
220
199
221
/* Add server to set of servers to retry periodically */
200
int add_server(const char *ip, uint16_t port,
201
AvahiIfIndex if_index,
202
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){
203
225
int ret;
204
226
server *new_server = malloc(sizeof(server));
205
227
if(new_server == NULL){
206
228
perror_plus("malloc");
207
return -1;
229
return false;
208
230
}
209
231
*new_server = (server){ .ip = strdup(ip),
210
.port = port,
211
.if_index = if_index,
212
.af = af };
232
.port = port,
233
.if_index = if_index,
234
.af = af };
213
235
if(new_server->ip == NULL){
214
236
perror_plus("strdup");
215
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;
216
253
}
217
254
/* Special case of first server */
218
if (mc.current_server == NULL){
255
if(*current_server == NULL){
219
256
new_server->next = new_server;
220
257
new_server->prev = new_server;
221
mc.current_server = new_server;
222
/* Place the new server last in the list */
258
*current_server = new_server;
223
259
} else {
224
new_server->next = mc.current_server;
225
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;
226
263
new_server->prev->next = new_server;
227
mc.current_server->prev = new_server;
228
}
229
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
230
if(ret == -1){
231
perror_plus("clock_gettime");
232
return -1;
233
}
234
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
235
267
}
236
268
237
269
/*
238
270
* Initialize GPGME.
239
271
*/
240
static bool init_gpgme(const char *seckey,
241
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){
242
277
gpgme_error_t rc;
243
278
gpgme_engine_info_t engine_info;
244
279
245
246
280
/*
247
281
* Helper function to insert pub and seckey to the engine keyring.
248
282
*/
249
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
250
284
int ret;
251
285
int fd;
252
286
gpgme_data_t pgp_data;
259
293
260
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
261
295
if(rc != GPG_ERR_NO_ERROR){
262
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
263
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));
264
298
return false;
265
299
}
266
300
267
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
268
302
if(rc != GPG_ERR_NO_ERROR){
269
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
271
305
return false;
272
306
}
273
307
280
314
}
281
315
282
316
if(debug){
283
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
284
318
}
285
319
286
320
/* Init GPGME */
287
321
gpgme_check_version(NULL);
288
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
289
323
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
291
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));
292
326
return false;
293
327
}
294
328
295
329
/* Set GPGME home directory for the OpenPGP engine only */
296
330
rc = gpgme_get_engine_info(&engine_info);
297
331
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
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));
300
334
return false;
301
335
}
302
336
while(engine_info != NULL){
308
342
engine_info = engine_info->next;
309
343
}
310
344
if(engine_info == NULL){
311
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);
312
347
return false;
313
348
}
314
349
315
350
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
317
352
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "bad gpgme_new: %s: %s\n",
319
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));
320
356
return false;
321
357
}
322
358
331
367
* Decrypt OpenPGP data.
332
368
* Returns -1 on error
333
369
*/
370
__attribute__((nonnull, warn_unused_result))
334
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
335
372
size_t crypto_size,
336
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
337
375
gpgme_data_t dh_crypto, dh_plain;
338
376
gpgme_error_t rc;
339
377
ssize_t ret;
341
379
ssize_t plaintext_length = 0;
342
380
343
381
if(debug){
344
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
383
}
346
384
347
385
/* Create new GPGME data buffer from memory cryptotext */
348
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
349
387
0);
350
388
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
352
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));
353
391
return -1;
354
392
}
355
393
356
394
/* Create new empty GPGME data buffer for the plaintext */
357
395
rc = gpgme_data_new(&dh_plain);
358
396
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
360
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));
361
400
gpgme_data_release(dh_crypto);
362
401
return -1;
363
402
}
364
403
365
404
/* Decrypt data from the cryptotext data buffer to the plaintext
366
405
data buffer */
367
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
368
407
if(rc != GPG_ERR_NO_ERROR){
369
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
371
410
plaintext_length = -1;
372
411
if(debug){
373
412
gpgme_decrypt_result_t result;
374
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
375
414
if(result == NULL){
376
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
377
416
} else {
378
fprintf(stderr, "Unsupported algorithm: %s\n",
379
result->unsupported_algorithm);
380
fprintf(stderr, "Wrong key usage: %u\n",
381
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);
382
421
if(result->file_name != NULL){
383
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
384
423
}
385
424
gpgme_recipient_t recipient;
386
425
recipient = result->recipients;
387
426
while(recipient != NULL){
388
fprintf(stderr, "Public key algorithm: %s\n",
389
gpgme_pubkey_algo_name(recipient->pubkey_algo));
390
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
391
fprintf(stderr, "Secret key available: %s\n",
392
recipient->status == GPG_ERR_NO_SECKEY
393
? "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");
394
434
recipient = recipient->next;
395
435
}
396
436
}
399
439
}
400
440
401
441
if(debug){
402
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
403
443
}
404
444
405
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
412
452
*plaintext = NULL;
413
453
while(true){
414
454
plaintext_capacity = incbuffer(plaintext,
415
(size_t)plaintext_length,
416
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
417
457
if(plaintext_capacity == 0){
418
perror_plus("incbuffer");
419
plaintext_length = -1;
420
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
421
461
}
422
462
423
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
476
}
437
477
438
478
if(debug){
439
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
440
480
for(ssize_t i = 0; i < plaintext_length; i++){
441
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
442
482
}
453
493
return plaintext_length;
454
494
}
455
495
456
static const char * safer_gnutls_strerror(int value){
457
const char *ret = gnutls_strerror(value); /* Spurious warning from
458
-Wunreachable-code */
459
if(ret == NULL)
460
ret = "(unknown)";
461
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
462
507
}
463
508
464
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
465
511
static void debuggnutls(__attribute__((unused)) int level,
466
512
const char* string){
467
fprintf(stderr, "GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
468
514
}
469
515
516
__attribute__((nonnull, warn_unused_result))
470
517
static int init_gnutls_global(const char *pubkeyfilename,
471
const char *seckeyfilename){
518
const char *seckeyfilename,
519
mandos_context *mc){
472
520
int ret;
521
unsigned int uret;
473
522
474
523
if(debug){
475
fprintf(stderr, "Initializing GnuTLS\n");
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
476
525
}
477
526
478
527
ret = gnutls_global_init();
479
528
if(ret != GNUTLS_E_SUCCESS){
480
fprintf(stderr, "GnuTLS global_init: %s\n",
481
safer_gnutls_strerror(ret));
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
482
531
return -1;
483
532
}
484
533
491
540
}
492
541
493
542
/* OpenPGP credentials */
494
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
495
544
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "GnuTLS memory error: %s\n",
497
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
498
547
gnutls_global_deinit();
499
548
return -1;
500
549
}
501
550
502
551
if(debug){
503
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
504
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
505
seckeyfilename);
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
554
pubkeyfilename,
555
seckeyfilename);
506
556
}
507
557
508
558
ret = gnutls_certificate_set_openpgp_key_file
509
(mc.cred, pubkeyfilename, seckeyfilename,
559
(mc->cred, pubkeyfilename, seckeyfilename,
510
560
GNUTLS_OPENPGP_FMT_BASE64);
511
561
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr,
513
"Error[%d] while reading the OpenPGP key pair ('%s',"
514
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
515
fprintf(stderr, "The GnuTLS error is: %s\n",
516
safer_gnutls_strerror(ret));
562
fprintf_plus(stderr,
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
safer_gnutls_strerror(ret));
517
567
goto globalfail;
518
568
}
519
569
520
570
/* GnuTLS server initialization */
521
ret = gnutls_dh_params_init(&mc.dh_params);
571
ret = gnutls_dh_params_init(&mc->dh_params);
522
572
if(ret != GNUTLS_E_SUCCESS){
523
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
524
" %s\n", safer_gnutls_strerror(ret));
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
525
576
goto globalfail;
526
577
}
527
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
528
680
if(ret != GNUTLS_E_SUCCESS){
529
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
530
safer_gnutls_strerror(ret));
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
531
683
goto globalfail;
532
684
}
533
685
534
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
535
687
536
688
return 0;
537
689
538
690
globalfail:
539
691
540
gnutls_certificate_free_credentials(mc.cred);
692
gnutls_certificate_free_credentials(mc->cred);
541
693
gnutls_global_deinit();
542
gnutls_dh_params_deinit(mc.dh_params);
694
gnutls_dh_params_deinit(mc->dh_params);
543
695
return -1;
544
696
}
545
697
546
static int init_gnutls_session(gnutls_session_t *session){
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
547
701
int ret;
548
702
/* GnuTLS session creation */
549
703
do {
553
707
}
554
708
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
555
709
if(ret != GNUTLS_E_SUCCESS){
556
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
557
safer_gnutls_strerror(ret));
710
fprintf_plus(stderr,
711
"Error in GnuTLS session initialization: %s\n",
712
safer_gnutls_strerror(ret));
558
713
}
559
714
560
715
{
561
716
const char *err;
562
717
do {
563
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
564
719
if(quit_now){
565
720
gnutls_deinit(*session);
566
721
return -1;
567
722
}
568
723
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
569
724
if(ret != GNUTLS_E_SUCCESS){
570
fprintf(stderr, "Syntax error at: %s\n", err);
571
fprintf(stderr, "GnuTLS error: %s\n",
572
safer_gnutls_strerror(ret));
725
fprintf_plus(stderr, "Syntax error at: %s\n", err);
726
fprintf_plus(stderr, "GnuTLS error: %s\n",
727
safer_gnutls_strerror(ret));
573
728
gnutls_deinit(*session);
574
729
return -1;
575
730
}
577
732
578
733
do {
579
734
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
735
mc->cred);
581
736
if(quit_now){
582
737
gnutls_deinit(*session);
583
738
return -1;
584
739
}
585
740
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
741
if(ret != GNUTLS_E_SUCCESS){
587
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
588
safer_gnutls_strerror(ret));
742
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
743
safer_gnutls_strerror(ret));
589
744
gnutls_deinit(*session);
590
745
return -1;
591
746
}
593
748
/* ignore client certificate if any. */
594
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
595
750
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
597
752
598
753
return 0;
599
754
}
603
758
__attribute__((unused)) const char *txt){}
604
759
605
760
/* Called when a Mandos server is found */
606
static int start_mandos_communication(const char *ip, uint16_t port,
761
__attribute__((nonnull, warn_unused_result))
762
static int start_mandos_communication(const char *ip, in_port_t port,
607
763
AvahiIfIndex if_index,
608
int af){
764
int af, mandos_context *mc){
609
765
int ret, tcp_sd = -1;
610
766
ssize_t sret;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
767
struct sockaddr_storage to;
615
768
char *buffer = NULL;
616
769
char *decrypted_buffer = NULL;
617
770
size_t buffer_length = 0;
636
789
pf = PF_INET;
637
790
break;
638
791
default:
639
fprintf(stderr, "Bad address family: %d\n", af);
792
fprintf_plus(stderr, "Bad address family: %d\n", af);
640
793
errno = EINVAL;
641
794
return -1;
642
795
}
643
796
644
ret = init_gnutls_session(&session);
797
/* If the interface is specified and we have a list of interfaces */
798
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
799
/* Check if the interface is one of the interfaces we are using */
800
bool match = false;
801
{
802
char *interface = NULL;
803
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
804
interface))){
805
if(if_nametoindex(interface) == (unsigned int)if_index){
806
match = true;
807
break;
808
}
809
}
810
}
811
if(not match){
812
/* This interface does not match any in the list, so we don't
813
connect to the server */
814
if(debug){
815
char interface[IF_NAMESIZE];
816
if(if_indextoname((unsigned int)if_index, interface) == NULL){
817
perror_plus("if_indextoname");
818
} else {
819
fprintf_plus(stderr, "Skipping server on non-used interface"
820
" \"%s\"\n",
821
if_indextoname((unsigned int)if_index,
822
interface));
823
}
824
}
825
return -1;
826
}
827
}
828
829
ret = init_gnutls_session(&session, mc);
645
830
if(ret != 0){
646
831
return -1;
647
832
}
648
833
649
834
if(debug){
650
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
835
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
836
PRIuMAX "\n", ip, (uintmax_t)port);
652
837
}
653
838
654
839
tcp_sd = socket(pf, SOCK_STREAM, 0);
666
851
667
852
memset(&to, 0, sizeof(to));
668
853
if(af == AF_INET6){
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
854
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
855
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
671
856
} else { /* IPv4 */
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
857
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
858
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
674
859
}
675
860
if(ret < 0 ){
676
861
int e = errno;
680
865
}
681
866
if(ret == 0){
682
867
int e = errno;
683
fprintf(stderr, "Bad address: %s\n", ip);
868
fprintf_plus(stderr, "Bad address: %s\n", ip);
684
869
errno = e;
685
870
goto mandos_end;
686
871
}
687
872
if(af == AF_INET6){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
873
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
874
if(IN6_IS_ADDR_LINKLOCAL
875
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
695
876
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
877
fprintf_plus(stderr, "An IPv6 link-local address is"
878
" incomplete without a network interface\n");
698
879
errno = EINVAL;
699
880
goto mandos_end;
700
881
}
701
882
/* Set the network interface number as scope */
702
to.in6.sin6_scope_id = (uint32_t)if_index;
883
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
703
884
}
704
885
} else {
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
886
((struct sockaddr_in *)&to)->sin_port = htons(port);
708
887
}
709
888
710
889
if(quit_now){
718
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
898
perror_plus("if_indextoname");
720
899
} else {
721
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
900
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
901
"\n", ip, interface, (uintmax_t)port);
723
902
}
724
903
} else {
725
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
726
port);
904
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
905
ip, (uintmax_t)port);
727
906
}
728
907
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
729
908
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
const char *pcret;
731
909
if(af == AF_INET6){
732
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
733
sizeof(addrstr));
910
ret = getnameinfo((struct sockaddr *)&to,
911
sizeof(struct sockaddr_in6),
912
addrstr, sizeof(addrstr), NULL, 0,
913
NI_NUMERICHOST);
734
914
} else {
735
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
736
sizeof(addrstr));
915
ret = getnameinfo((struct sockaddr *)&to,
916
sizeof(struct sockaddr_in),
917
addrstr, sizeof(addrstr), NULL, 0,
918
NI_NUMERICHOST);
737
919
}
738
if(pcret == NULL){
739
perror_plus("inet_ntop");
740
} else {
741
if(strcmp(addrstr, ip) != 0){
742
fprintf(stderr, "Canonical address form: %s\n", addrstr);
743
}
920
if(ret == EAI_SYSTEM){
921
perror_plus("getnameinfo");
922
} else if(ret != 0) {
923
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
924
} else if(strcmp(addrstr, ip) != 0){
925
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
744
926
}
745
927
}
746
928
750
932
}
751
933
752
934
if(af == AF_INET6){
753
ret = connect(tcp_sd, &to.in6, sizeof(to));
935
ret = connect(tcp_sd, (struct sockaddr *)&to,
936
sizeof(struct sockaddr_in6));
754
937
} else {
755
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
938
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
939
sizeof(struct sockaddr_in));
756
940
}
757
941
if(ret < 0){
758
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
942
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
759
943
int e = errno;
760
944
perror_plus("connect");
761
945
errno = e;
773
957
while(true){
774
958
size_t out_size = strlen(out);
775
959
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
776
out_size - written));
960
out_size - written));
777
961
if(ret == -1){
778
962
int e = errno;
779
963
perror_plus("write");
799
983
}
800
984
801
985
if(debug){
802
fprintf(stderr, "Establishing TLS session with %s\n", ip);
986
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
803
987
}
804
988
805
989
if(quit_now){
807
991
goto mandos_end;
808
992
}
809
993
810
/* Spurious warning from -Wint-to-pointer-cast */
811
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
994
/* This casting via intptr_t is to eliminate warning about casting
995
an int to a pointer type. This is exactly how the GnuTLS Guile
996
function "set-session-transport-fd!" does it. */
997
gnutls_transport_set_ptr(session,
998
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
812
999
813
1000
if(quit_now){
814
1001
errno = EINTR;
825
1012
826
1013
if(ret != GNUTLS_E_SUCCESS){
827
1014
if(debug){
828
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1015
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
829
1016
gnutls_perror(ret);
830
1017
}
831
1018
errno = EPROTO;
835
1022
/* Read OpenPGP packet that contains the wanted password */
836
1023
837
1024
if(debug){
838
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
839
ip);
1025
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1026
" %s\n", ip);
840
1027
}
841
1028
842
1029
while(true){
847
1034
}
848
1035
849
1036
buffer_capacity = incbuffer(&buffer, buffer_length,
850
buffer_capacity);
1037
buffer_capacity);
851
1038
if(buffer_capacity == 0){
852
1039
int e = errno;
853
1040
perror_plus("incbuffer");
880
1067
}
881
1068
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
882
1069
if(ret < 0){
883
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1070
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1071
"***\n");
884
1072
gnutls_perror(ret);
885
1073
errno = EPROTO;
886
1074
goto mandos_end;
887
1075
}
888
1076
break;
889
1077
default:
890
fprintf(stderr, "Unknown error while reading data from"
891
" encrypted session with Mandos server\n");
1078
fprintf_plus(stderr, "Unknown error while reading data from"
1079
" encrypted session with Mandos server\n");
892
1080
gnutls_bye(session, GNUTLS_SHUT_RDWR);
893
1081
errno = EIO;
894
1082
goto mandos_end;
899
1087
}
900
1088
901
1089
if(debug){
902
fprintf(stderr, "Closing TLS session\n");
1090
fprintf_plus(stderr, "Closing TLS session\n");
903
1091
}
904
1092
905
1093
if(quit_now){
917
1105
918
1106
if(buffer_length > 0){
919
1107
ssize_t decrypted_buffer_size;
920
decrypted_buffer_size = pgp_packet_decrypt(buffer,
921
buffer_length,
922
&decrypted_buffer);
1108
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1109
&decrypted_buffer, mc);
923
1110
if(decrypted_buffer_size >= 0){
924
1111
925
1112
written = 0;
935
1122
if(ret == 0 and ferror(stdout)){
936
1123
int e = errno;
937
1124
if(debug){
938
fprintf(stderr, "Error writing encrypted data: %s\n",
939
strerror(errno));
1125
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1126
strerror(errno));
940
1127
}
941
1128
errno = e;
942
1129
goto mandos_end;
973
1160
return retval;
974
1161
}
975
1162
1163
__attribute__((nonnull))
976
1164
static void resolve_callback(AvahiSServiceResolver *r,
977
1165
AvahiIfIndex interface,
978
1166
AvahiProtocol proto,
986
1174
AVAHI_GCC_UNUSED AvahiStringList *txt,
987
1175
AVAHI_GCC_UNUSED AvahiLookupResultFlags
988
1176
flags,
989
AVAHI_GCC_UNUSED void* userdata){
990
assert(r);
1177
void *mc){
1178
if(r == NULL){
1179
return;
1180
}
991
1181
992
1182
/* Called whenever a service has been resolved successfully or
993
1183
timed out */
994
1184
995
1185
if(quit_now){
1186
avahi_s_service_resolver_free(r);
996
1187
return;
997
1188
}
998
1189
999
1190
switch(event){
1000
1191
default:
1001
1192
case AVAHI_RESOLVER_FAILURE:
1002
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1003
" of type '%s' in domain '%s': %s\n", name, type, domain,
1004
avahi_strerror(avahi_server_errno(mc.server)));
1193
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1194
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1195
domain,
1196
avahi_strerror(avahi_server_errno
1197
(((mandos_context*)mc)->server)));
1005
1198
break;
1006
1199
1007
1200
case AVAHI_RESOLVER_FOUND:
1009
1202
char ip[AVAHI_ADDRESS_STR_MAX];
1010
1203
avahi_address_snprint(ip, sizeof(ip), address);
1011
1204
if(debug){
1012
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1013
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1014
ip, (intmax_t)interface, port);
1205
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1206
PRIdMAX ") on port %" PRIu16 "\n", name,
1207
host_name, ip, (intmax_t)interface, port);
1015
1208
}
1016
int ret = start_mandos_communication(ip, port, interface,
1017
avahi_proto_to_af(proto));
1209
int ret = start_mandos_communication(ip, (in_port_t)port,
1210
interface,
1211
avahi_proto_to_af(proto),
1212
mc);
1018
1213
if(ret == 0){
1019
avahi_simple_poll_quit(mc.simple_poll);
1214
avahi_simple_poll_quit(simple_poll);
1020
1215
} else {
1021
ret = add_server(ip, port, interface,
1022
avahi_proto_to_af(proto));
1216
if(not add_server(ip, (in_port_t)port, interface,
1217
avahi_proto_to_af(proto),
1218
&((mandos_context*)mc)->current_server)){
1219
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1220
" list\n", name);
1221
}
1023
1222
}
1024
1223
}
1025
1224
}
1035
1234
const char *domain,
1036
1235
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1037
1236
flags,
1038
AVAHI_GCC_UNUSED void* userdata){
1039
assert(b);
1237
void *mc){
1238
if(b == NULL){
1239
return;
1240
}
1040
1241
1041
1242
/* Called whenever a new services becomes available on the LAN or
1042
1243
is removed from the LAN */
1049
1250
default:
1050
1251
case AVAHI_BROWSER_FAILURE:
1051
1252
1052
fprintf(stderr, "(Avahi browser) %s\n",
1053
avahi_strerror(avahi_server_errno(mc.server)));
1054
avahi_simple_poll_quit(mc.simple_poll);
1253
fprintf_plus(stderr, "(Avahi browser) %s\n",
1254
avahi_strerror(avahi_server_errno
1255
(((mandos_context*)mc)->server)));
1256
avahi_simple_poll_quit(simple_poll);
1055
1257
return;
1056
1258
1057
1259
case AVAHI_BROWSER_NEW:
1060
1262
the callback function is called the Avahi server will free the
1061
1263
resolver for us. */
1062
1264
1063
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1064
name, type, domain, protocol, 0,
1065
resolve_callback, NULL) == NULL)
1066
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1067
name, avahi_strerror(avahi_server_errno(mc.server)));
1265
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1266
interface, protocol, name, type,
1267
domain, protocol, 0,
1268
resolve_callback, mc) == NULL)
1269
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1270
" %s\n", name,
1271
avahi_strerror(avahi_server_errno
1272
(((mandos_context*)mc)->server)));
1068
1273
break;
1069
1274
1070
1275
case AVAHI_BROWSER_REMOVE:
1073
1278
case AVAHI_BROWSER_ALL_FOR_NOW:
1074
1279
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1075
1280
if(debug){
1076
fprintf(stderr, "No Mandos server found, still searching...\n");
1281
fprintf_plus(stderr, "No Mandos server found, still"
1282
" searching...\n");
1077
1283
}
1078
1284
break;
1079
1285
}
1088
1294
signal_received = sig;
1089
1295
int old_errno = errno;
1090
1296
/* set main loop to exit */
1091
if(mc.simple_poll != NULL){
1092
avahi_simple_poll_quit(mc.simple_poll);
1297
if(simple_poll != NULL){
1298
avahi_simple_poll_quit(simple_poll);
1093
1299
}
1094
1300
errno = old_errno;
1095
1301
}
1096
1302
1303
__attribute__((nonnull, warn_unused_result))
1097
1304
bool get_flags(const char *ifname, struct ifreq *ifr){
1098
1305
int ret;
1306
error_t ret_errno;
1099
1307
1100
1308
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1101
1309
if(s < 0){
1310
ret_errno = errno;
1102
1311
perror_plus("socket");
1312
errno = ret_errno;
1103
1313
return false;
1104
1314
}
1105
1315
strcpy(ifr->ifr_name, ifname);
1106
1316
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1107
1317
if(ret == -1){
1108
1318
if(debug){
1319
ret_errno = errno;
1109
1320
perror_plus("ioctl SIOCGIFFLAGS");
1321
errno = ret_errno;
1110
1322
}
1111
1323
return false;
1112
1324
}
1113
1325
return true;
1114
1326
}
1115
1327
1328
__attribute__((nonnull, warn_unused_result))
1116
1329
bool good_flags(const char *ifname, const struct ifreq *ifr){
1117
1330
1118
1331
/* Reject the loopback device */
1119
1332
if(ifr->ifr_flags & IFF_LOOPBACK){
1120
1333
if(debug){
1121
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1122
ifname);
1334
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1335
ifname);
1123
1336
}
1124
1337
return false;
1125
1338
}
1126
1339
/* Accept point-to-point devices only if connect_to is specified */
1127
1340
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1128
1341
if(debug){
1129
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1130
ifname);
1342
fprintf_plus(stderr, "Accepting point-to-point interface"
1343
" \"%s\"\n", ifname);
1131
1344
}
1132
1345
return true;
1133
1346
}
1134
1347
/* Otherwise, reject non-broadcast-capable devices */
1135
1348
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1136
1349
if(debug){
1137
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1138
ifname);
1350
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1351
" \"%s\"\n", ifname);
1139
1352
}
1140
1353
return false;
1141
1354
}
1142
1355
/* Reject non-ARP interfaces (including dummy interfaces) */
1143
1356
if(ifr->ifr_flags & IFF_NOARP){
1144
1357
if(debug){
1145
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1358
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1359
ifname);
1146
1360
}
1147
1361
return false;
1148
1362
}
1149
1363
1150
1364
/* Accept this device */
1151
1365
if(debug){
1152
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1366
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1153
1367
}
1154
1368
return true;
1155
1369
}
1159
1373
* corresponds to an acceptable network device.
1160
1374
* (This function is passed to scandir(3) as a filter function.)
1161
1375
*/
1376
__attribute__((nonnull, warn_unused_result))
1162
1377
int good_interface(const struct dirent *if_entry){
1163
int ret;
1164
1378
if(if_entry->d_name[0] == '.'){
1165
1379
return 0;
1166
1380
}
1381
1167
1382
struct ifreq ifr;
1168
1169
1383
if(not get_flags(if_entry->d_name, &ifr)){
1384
if(debug){
1385
fprintf_plus(stderr, "Failed to get flags for interface "
1386
"\"%s\"\n", if_entry->d_name);
1387
}
1170
1388
return 0;
1171
1389
}
1172
1390
1177
1395
}
1178
1396
1179
1397
/*
1180
* This function determines if a directory entry in /sys/class/net
1181
* corresponds to an acceptable network device which is up.
1182
* (This function is passed to scandir(3) as a filter function.)
1183
*/
1184
int up_interface(const struct dirent *if_entry){
1185
ssize_t ssret;
1186
char *flagname = NULL;
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1191
if_entry->d_name);
1192
if(ret < 0){
1193
perror_plus("asprintf");
1194
return 0;
1195
}
1196
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1197
if(flags_fd == -1){
1198
perror_plus("open");
1199
free(flagname);
1200
return 0;
1201
}
1202
free(flagname);
1203
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1204
/* read line from flags_fd */
1205
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1206
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1207
flagstring[(size_t)to_read] = '\0';
1208
if(flagstring == NULL){
1209
perror_plus("malloc");
1210
close(flags_fd);
1211
return 0;
1212
}
1213
while(to_read > 0){
1214
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1215
(size_t)to_read));
1216
if(ssret == -1){
1217
perror_plus("read");
1218
free(flagstring);
1219
close(flags_fd);
1220
return 0;
1221
}
1222
to_read -= ssret;
1223
if(ssret == 0){
1224
break;
1225
}
1226
}
1227
close(flags_fd);
1228
intmax_t tmpmax;
1229
char *tmp;
1230
errno = 0;
1231
tmpmax = strtoimax(flagstring, &tmp, 0);
1232
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1233
and not (isspace(*tmp)))
1234
or tmpmax != (ifreq_flags)tmpmax){
1235
if(debug){
1236
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1237
flagstring, if_entry->d_name);
1238
}
1239
free(flagstring);
1240
return 0;
1241
}
1242
free(flagstring);
1243
ifreq_flags flags = (ifreq_flags)tmpmax;
1244
/* Reject the loopback device */
1245
if(flags & IFF_LOOPBACK){
1246
if(debug){
1247
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject down interfaces */
1254
if(not (flags & IFF_UP)){
1255
return 0;
1256
}
1257
1258
/* Accept point-to-point devices only if connect_to is specified */
1259
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1260
if(debug){
1261
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 1;
1265
}
1266
/* Otherwise, reject non-broadcast-capable devices */
1267
if(not (flags & IFF_BROADCAST)){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Reject non-ARP interfaces (including dummy interfaces) */
1275
if(flags & IFF_NOARP){
1276
if(debug){
1277
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1278
if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
/* Accept this device */
1283
if(debug){
1284
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1285
if_entry->d_name);
1286
}
1287
return 1;
1288
}
1289
1398
* This function determines if a network interface is up.
1399
*/
1400
__attribute__((nonnull, warn_unused_result))
1401
bool interface_is_up(const char *interface){
1402
struct ifreq ifr;
1403
if(not get_flags(interface, &ifr)){
1404
if(debug){
1405
fprintf_plus(stderr, "Failed to get flags for interface "
1406
"\"%s\"\n", interface);
1407
}
1408
return false;
1409
}
1410
1411
return (bool)(ifr.ifr_flags & IFF_UP);
1412
}
1413
1414
/*
1415
* This function determines if a network interface is running
1416
*/
1417
__attribute__((nonnull, warn_unused_result))
1418
bool interface_is_running(const char *interface){
1419
struct ifreq ifr;
1420
if(not get_flags(interface, &ifr)){
1421
if(debug){
1422
fprintf_plus(stderr, "Failed to get flags for interface "
1423
"\"%s\"\n", interface);
1424
}
1425
return false;
1426
}
1427
1428
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1429
}
1430
1431
__attribute__((nonnull, pure, warn_unused_result))
1290
1432
int notdotentries(const struct dirent *direntry){
1291
1433
/* Skip "." and ".." */
1292
1434
if(direntry->d_name[0] == '.'
1299
1441
}
1300
1442
1301
1443
/* Is this directory entry a runnable program? */
1444
__attribute__((nonnull, warn_unused_result))
1302
1445
int runnable_hook(const struct dirent *direntry){
1303
1446
int ret;
1447
size_t sret;
1304
1448
struct stat st;
1305
1449
1306
1450
if((direntry->d_name)[0] == '\0'){
1308
1452
return 0;
1309
1453
}
1310
1454
1311
/* Save pointer to last character */
1312
char *end = strchr(direntry->d_name, '\0')-1;
1313
1314
if(*end == '~'){
1315
/* Backup name~ */
1316
return 0;
1317
}
1318
1319
if(((direntry->d_name)[0] == '#')
1320
and (*end == '#')){
1321
/* Temporary #name# */
1322
return 0;
1323
}
1324
1325
/* XXX more rules here */
1326
1327
ret = stat(direntry->d_name, &st);
1455
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1456
"abcdefghijklmnopqrstuvwxyz"
1457
"0123456789"
1458
"_.-");
1459
if((direntry->d_name)[sret] != '\0'){
1460
/* Contains non-allowed characters */
1461
if(debug){
1462
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1463
direntry->d_name);
1464
}
1465
return 0;
1466
}
1467
1468
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1328
1469
if(ret == -1){
1329
1470
if(debug){
1330
perror_plus("Could not stat plugin");
1471
perror_plus("Could not stat hook");
1331
1472
}
1332
1473
return 0;
1333
1474
}
1334
if(not (st.st_mode & S_ISREG)){
1475
if(not (S_ISREG(st.st_mode))){
1335
1476
/* Not a regular file */
1477
if(debug){
1478
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1479
direntry->d_name);
1480
}
1336
1481
return 0;
1337
1482
}
1338
1483
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1339
1484
/* Not executable */
1485
if(debug){
1486
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1487
direntry->d_name);
1488
}
1340
1489
return 0;
1341
1490
}
1491
if(debug){
1492
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1493
direntry->d_name);
1494
}
1342
1495
return 1;
1343
1496
}
1344
1497
1345
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1498
__attribute__((nonnull, warn_unused_result))
1499
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1500
mandos_context *mc){
1346
1501
int ret;
1347
1502
struct timespec now;
1348
1503
struct timespec waited_time;
1349
1504
intmax_t block_time;
1350
1505
1351
1506
while(true){
1352
if(mc.current_server == NULL){
1353
if (debug){
1354
fprintf(stderr,
1355
"Wait until first server is found. No timeout!\n");
1507
if(mc->current_server == NULL){
1508
if(debug){
1509
fprintf_plus(stderr, "Wait until first server is found."
1510
" No timeout!\n");
1356
1511
}
1357
1512
ret = avahi_simple_poll_iterate(s, -1);
1358
1513
} else {
1359
if (debug){
1360
fprintf(stderr, "Check current_server if we should run it,"
1361
" or wait\n");
1514
if(debug){
1515
fprintf_plus(stderr, "Check current_server if we should run"
1516
" it, or wait\n");
1362
1517
}
1363
1518
/* the current time */
1364
1519
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1369
1524
/* Calculating in ms how long time between now and server
1370
1525
who we visted longest time ago. Now - last seen. */
1371
1526
waited_time.tv_sec = (now.tv_sec
1372
- mc.current_server->last_seen.tv_sec);
1527
- mc->current_server->last_seen.tv_sec);
1373
1528
waited_time.tv_nsec = (now.tv_nsec
1374
- mc.current_server->last_seen.tv_nsec);
1529
- mc->current_server->last_seen.tv_nsec);
1375
1530
/* total time is 10s/10,000ms.
1376
1531
Converting to s from ms by dividing by 1,000,
1377
1532
and ns to ms by dividing by 1,000,000. */
1379
1534
- ((intmax_t)waited_time.tv_sec * 1000))
1380
1535
- ((intmax_t)waited_time.tv_nsec / 1000000));
1381
1536
1382
if (debug){
1383
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1537
if(debug){
1538
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1539
block_time);
1384
1540
}
1385
1541
1386
1542
if(block_time <= 0){
1387
ret = start_mandos_communication(mc.current_server->ip,
1388
mc.current_server->port,
1389
mc.current_server->if_index,
1390
mc.current_server->af);
1543
ret = start_mandos_communication(mc->current_server->ip,
1544
mc->current_server->port,
1545
mc->current_server->if_index,
1546
mc->current_server->af, mc);
1391
1547
if(ret == 0){
1392
avahi_simple_poll_quit(mc.simple_poll);
1548
avahi_simple_poll_quit(s);
1393
1549
return 0;
1394
1550
}
1395
1551
ret = clock_gettime(CLOCK_MONOTONIC,
1396
&mc.current_server->last_seen);
1552
&mc->current_server->last_seen);
1397
1553
if(ret == -1){
1398
1554
perror_plus("clock_gettime");
1399
1555
return -1;
1400
1556
}
1401
mc.current_server = mc.current_server->next;
1557
mc->current_server = mc->current_server->next;
1402
1558
block_time = 0; /* Call avahi to find new Mandos
1403
1559
servers, but don't block */
1404
1560
}
1406
1562
ret = avahi_simple_poll_iterate(s, (int)block_time);
1407
1563
}
1408
1564
if(ret != 0){
1409
if (ret > 0 or errno != EINTR) {
1565
if(ret > 0 or errno != EINTR){
1410
1566
return (ret != 1) ? ret : 0;
1411
1567
}
1412
1568
}
1413
1569
}
1414
1570
}
1415
1571
1572
/* Set effective uid to 0, return errno */
1573
__attribute__((warn_unused_result))
1574
error_t raise_privileges(void){
1575
error_t old_errno = errno;
1576
error_t ret_errno = 0;
1577
if(seteuid(0) == -1){
1578
ret_errno = errno;
1579
}
1580
errno = old_errno;
1581
return ret_errno;
1582
}
1583
1584
/* Set effective and real user ID to 0. Return errno. */
1585
__attribute__((warn_unused_result))
1586
error_t raise_privileges_permanently(void){
1587
error_t old_errno = errno;
1588
error_t ret_errno = raise_privileges();
1589
if(ret_errno != 0){
1590
errno = old_errno;
1591
return ret_errno;
1592
}
1593
if(setuid(0) == -1){
1594
ret_errno = errno;
1595
}
1596
errno = old_errno;
1597
return ret_errno;
1598
}
1599
1600
/* Set effective user ID to unprivileged saved user ID */
1601
__attribute__((warn_unused_result))
1602
error_t lower_privileges(void){
1603
error_t old_errno = errno;
1604
error_t ret_errno = 0;
1605
if(seteuid(uid) == -1){
1606
ret_errno = errno;
1607
}
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
/* Lower privileges permanently */
1613
__attribute__((warn_unused_result))
1614
error_t lower_privileges_permanently(void){
1615
error_t old_errno = errno;
1616
error_t ret_errno = 0;
1617
if(setuid(uid) == -1){
1618
ret_errno = errno;
1619
}
1620
errno = old_errno;
1621
return ret_errno;
1622
}
1623
1624
__attribute__((nonnull))
1625
void run_network_hooks(const char *mode, const char *interface,
1626
const float delay){
1627
struct dirent **direntries = NULL;
1628
if(hookdir_fd == -1){
1629
hookdir_fd = open(hookdir, O_RDONLY);
1630
if(hookdir_fd == -1){
1631
if(errno == ENOENT){
1632
if(debug){
1633
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1634
" found\n", hookdir);
1635
}
1636
} else {
1637
perror_plus("open");
1638
}
1639
return;
1640
}
1641
}
1642
#ifdef __GLIBC__
1643
#if __GLIBC_PREREQ(2, 15)
1644
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1645
runnable_hook, alphasort);
1646
#else /* not __GLIBC_PREREQ(2, 15) */
1647
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1648
alphasort);
1649
#endif /* not __GLIBC_PREREQ(2, 15) */
1650
#else /* not __GLIBC__ */
1651
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1652
alphasort);
1653
#endif /* not __GLIBC__ */
1654
if(numhooks == -1){
1655
perror_plus("scandir");
1656
return;
1657
}
1658
struct dirent *direntry;
1659
int ret;
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[i];
1663
if(debug){
1664
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1665
direntry->d_name);
1666
}
1667
pid_t hook_pid = fork();
1668
if(hook_pid == 0){
1669
/* Child */
1670
/* Raise privileges */
1671
errno = raise_privileges_permanently();
1672
if(errno != 0){
1673
perror_plus("Failed to raise privileges");
1674
_exit(EX_NOPERM);
1675
}
1676
/* Set group */
1677
errno = 0;
1678
ret = setgid(0);
1679
if(ret == -1){
1680
perror_plus("setgid");
1681
_exit(EX_NOPERM);
1682
}
1683
/* Reset supplementary groups */
1684
errno = 0;
1685
ret = setgroups(0, NULL);
1686
if(ret == -1){
1687
perror_plus("setgroups");
1688
_exit(EX_NOPERM);
1689
}
1690
ret = dup2(devnull, STDIN_FILENO);
1691
if(ret == -1){
1692
perror_plus("dup2(devnull, STDIN_FILENO)");
1693
_exit(EX_OSERR);
1694
}
1695
ret = close(devnull);
1696
if(ret == -1){
1697
perror_plus("close");
1698
_exit(EX_OSERR);
1699
}
1700
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1701
if(ret == -1){
1702
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1703
_exit(EX_OSERR);
1704
}
1705
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1706
if(ret == -1){
1707
perror_plus("setenv");
1708
_exit(EX_OSERR);
1709
}
1710
ret = setenv("DEVICE", interface, 1);
1711
if(ret == -1){
1712
perror_plus("setenv");
1713
_exit(EX_OSERR);
1714
}
1715
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1716
if(ret == -1){
1717
perror_plus("setenv");
1718
_exit(EX_OSERR);
1719
}
1720
ret = setenv("MODE", mode, 1);
1721
if(ret == -1){
1722
perror_plus("setenv");
1723
_exit(EX_OSERR);
1724
}
1725
char *delaystring;
1726
ret = asprintf(&delaystring, "%f", (double)delay);
1727
if(ret == -1){
1728
perror_plus("asprintf");
1729
_exit(EX_OSERR);
1730
}
1731
ret = setenv("DELAY", delaystring, 1);
1732
if(ret == -1){
1733
free(delaystring);
1734
perror_plus("setenv");
1735
_exit(EX_OSERR);
1736
}
1737
free(delaystring);
1738
if(connect_to != NULL){
1739
ret = setenv("CONNECT", connect_to, 1);
1740
if(ret == -1){
1741
perror_plus("setenv");
1742
_exit(EX_OSERR);
1743
}
1744
}
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1746
if(hook_fd == -1){
1747
perror_plus("openat");
1748
_exit(EXIT_FAILURE);
1749
}
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1751
perror_plus("close");
1752
_exit(EXIT_FAILURE);
1753
}
1754
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1755
environ) == -1){
1756
perror_plus("fexecve");
1757
_exit(EXIT_FAILURE);
1758
}
1759
} else {
1760
if(hook_pid == -1){
1761
perror_plus("fork");
1762
free(direntry);
1763
continue;
1764
}
1765
int status;
1766
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1767
perror_plus("waitpid");
1768
free(direntry);
1769
continue;
1770
}
1771
if(WIFEXITED(status)){
1772
if(WEXITSTATUS(status) != 0){
1773
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1774
" with status %d\n", direntry->d_name,
1775
WEXITSTATUS(status));
1776
free(direntry);
1777
continue;
1778
}
1779
} else if(WIFSIGNALED(status)){
1780
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1781
" signal %d\n", direntry->d_name,
1782
WTERMSIG(status));
1783
free(direntry);
1784
continue;
1785
} else {
1786
fprintf_plus(stderr, "Warning: network hook \"%s\""
1787
" crashed\n", direntry->d_name);
1788
free(direntry);
1789
continue;
1790
}
1791
}
1792
if(debug){
1793
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1794
direntry->d_name);
1795
}
1796
free(direntry);
1797
}
1798
free(direntries);
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1800
perror_plus("close");
1801
} else {
1802
hookdir_fd = -1;
1803
}
1804
close(devnull);
1805
}
1806
1807
__attribute__((nonnull, warn_unused_result))
1808
error_t bring_up_interface(const char *const interface,
1809
const float delay){
1810
error_t old_errno = errno;
1811
int ret;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
1820
if(quit_now){
1821
errno = old_errno;
1822
return EINTR;
1823
}
1824
1825
if(not interface_is_up(interface)){
1826
error_t ret_errno = 0, ioctl_errno = 0;
1827
if(not get_flags(interface, &network)){
1828
ret_errno = errno;
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
network.ifr_flags |= IFF_UP; /* set flag */
1835
1836
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1837
if(sd == -1){
1838
ret_errno = errno;
1839
perror_plus("socket");
1840
errno = old_errno;
1841
return ret_errno;
1842
}
1843
1844
if(quit_now){
1845
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
errno = old_errno;
1850
return EINTR;
1851
}
1852
1853
if(debug){
1854
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1855
interface);
1856
}
1857
1858
/* Raise privileges */
1859
ret_errno = raise_privileges();
1860
if(ret_errno != 0){
1861
errno = ret_errno;
1862
perror_plus("Failed to raise privileges");
1863
}
1864
1865
#ifdef __linux__
1866
int ret_linux;
1867
bool restore_loglevel = false;
1868
if(ret_errno == 0){
1869
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1870
messages about the network interface to mess up the prompt */
1871
ret_linux = klogctl(8, NULL, 5);
1872
if(ret_linux == -1){
1873
perror_plus("klogctl");
1874
} else {
1875
restore_loglevel = true;
1876
}
1877
}
1878
#endif /* __linux__ */
1879
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1880
ioctl_errno = errno;
1881
#ifdef __linux__
1882
if(restore_loglevel){
1883
ret_linux = klogctl(7, NULL, 0);
1884
if(ret_linux == -1){
1885
perror_plus("klogctl");
1886
}
1887
}
1888
#endif /* __linux__ */
1889
1890
/* If raise_privileges() succeeded above */
1891
if(ret_errno == 0){
1892
/* Lower privileges */
1893
ret_errno = lower_privileges();
1894
if(ret_errno != 0){
1895
errno = ret_errno;
1896
perror_plus("Failed to lower privileges");
1897
}
1898
}
1899
1900
/* Close the socket */
1901
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1902
if(ret == -1){
1903
perror_plus("close");
1904
}
1905
1906
if(ret_setflags == -1){
1907
errno = ioctl_errno;
1908
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1909
errno = old_errno;
1910
return ioctl_errno;
1911
}
1912
} else if(debug){
1913
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1914
interface);
1915
}
1916
1917
/* Sleep checking until interface is running.
1918
Check every 0.25s, up to total time of delay */
1919
for(int i=0; i < delay * 4; i++){
1920
if(interface_is_running(interface)){
1921
break;
1922
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
1930
errno = old_errno;
1931
return 0;
1932
}
1933
1934
__attribute__((nonnull, warn_unused_result))
1935
error_t take_down_interface(const char *const interface){
1936
error_t old_errno = errno;
1937
struct ifreq network;
1938
unsigned int if_index = if_nametoindex(interface);
1939
if(if_index == 0){
1940
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1941
errno = old_errno;
1942
return ENXIO;
1943
}
1944
if(interface_is_up(interface)){
1945
error_t ret_errno = 0, ioctl_errno = 0;
1946
if(not get_flags(interface, &network) and debug){
1947
ret_errno = errno;
1948
fprintf_plus(stderr, "Failed to get flags for interface "
1949
"\"%s\"\n", interface);
1950
errno = old_errno;
1951
return ret_errno;
1952
}
1953
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1954
1955
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1956
if(sd == -1){
1957
ret_errno = errno;
1958
perror_plus("socket");
1959
errno = old_errno;
1960
return ret_errno;
1961
}
1962
1963
if(debug){
1964
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1965
interface);
1966
}
1967
1968
/* Raise privileges */
1969
ret_errno = raise_privileges();
1970
if(ret_errno != 0){
1971
errno = ret_errno;
1972
perror_plus("Failed to raise privileges");
1973
}
1974
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
1978
/* If raise_privileges() succeeded above */
1979
if(ret_errno == 0){
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1982
if(ret_errno != 0){
1983
errno = ret_errno;
1984
perror_plus("Failed to lower privileges");
1985
}
1986
}
1987
1988
/* Close the socket */
1989
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1997
errno = old_errno;
1998
return ioctl_errno;
1999
}
2000
} else if(debug){
2001
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2002
interface);
2003
}
2004
2005
errno = old_errno;
2006
return 0;
2007
}
2008
1416
2009
int main(int argc, char *argv[]){
2010
mandos_context mc = { .server = NULL, .dh_bits = 0,
2011
.priority = "SECURE256:!CTYPE-X.509:"
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2013
.interfaces = NULL, .interfaces_size = 0 };
1417
2014
AvahiSServiceBrowser *sb = NULL;
1418
int error;
2015
error_t ret_errno;
1419
2016
int ret;
1420
2017
intmax_t tmpmax;
1421
2018
char *tmp;
1422
2019
int exitcode = EXIT_SUCCESS;
1423
const char *interface = "";
1424
struct ifreq network;
1425
int sd = -1;
1426
bool take_down_interface = false;
1427
uid_t uid;
1428
gid_t gid;
1429
char tempdir[] = "/tmp/mandosXXXXXX";
1430
bool tempdir_created = false;
2020
char *interfaces_to_take_down = NULL;
2021
size_t interfaces_to_take_down_size = 0;
2022
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2023
char old_tempdir[] = "/tmp/mandosXXXXXX";
2024
char *tempdir = NULL;
1431
2025
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1432
2026
const char *seckey = PATHDIR "/" SECKEY;
1433
2027
const char *pubkey = PATHDIR "/" PUBKEY;
2028
char *interfaces_hooks = NULL;
1434
2029
1435
2030
bool gnutls_initialized = false;
1436
2031
bool gpgme_initialized = false;
1498
2093
.group = 2 },
1499
2094
{ .name = "retry", .key = 132,
1500
2095
.arg = "SECONDS",
1501
.doc = "Retry interval used when denied by the mandos server",
2096
.doc = "Retry interval used when denied by the Mandos server",
2097
.group = 2 },
2098
{ .name = "network-hook-dir", .key = 133,
2099
.arg = "DIR",
2100
.doc = "Directory where network hooks are located",
1502
2101
.group = 2 },
1503
2102
/*
1504
2103
* These reproduce what we would get without ARGP_NO_HELP
1523
2122
connect_to = arg;
1524
2123
break;
1525
2124
case 'i': /* --interface */
1526
interface = arg;
2125
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2126
arg, (int)',');
2127
if(ret_errno != 0){
2128
argp_error(state, "%s", strerror(ret_errno));
2129
}
1527
2130
break;
1528
2131
case 's': /* --seckey */
1529
2132
seckey = arg;
1558
2161
argp_error(state, "Bad retry interval");
1559
2162
}
1560
2163
break;
2164
case 133: /* --network-hook-dir */
2165
hookdir = arg;
2166
break;
1561
2167
/*
1562
2168
* These reproduce what we would get without ARGP_NO_HELP
1563
2169
*/
1569
2175
argp_state_help(state, state->out_stream,
1570
2176
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1571
2177
case 'V': /* --version */
1572
fprintf(state->out_stream, "%s\n", argp_program_version);
2178
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1573
2179
exit(argp_err_exit_status);
1574
2180
break;
1575
2181
default:
1602
2208
{
1603
2209
/* Work around Debian bug #633582:
1604
2210
<http://bugs.debian.org/633582> */
1605
struct stat st;
1606
1607
/* Re-raise priviliges */
1608
errno = 0;
1609
ret = seteuid(0);
1610
if(ret == -1){
1611
perror_plus("seteuid");
1612
}
1613
1614
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1615
int seckey_fd = open(seckey, O_RDONLY);
1616
if(seckey_fd == -1){
1617
perror_plus("open");
1618
} else {
1619
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
if(ret == -1){
1621
perror_plus("fstat");
1622
} else {
1623
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1624
ret = fchown(seckey_fd, uid, gid);
1625
if(ret == -1){
1626
perror_plus("fchown");
1627
}
1628
}
1629
}
1630
TEMP_FAILURE_RETRY(close(seckey_fd));
1631
}
1632
}
1633
1634
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1635
int pubkey_fd = open(pubkey, O_RDONLY);
1636
if(pubkey_fd == -1){
1637
perror_plus("open");
1638
} else {
1639
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
if(ret == -1){
1641
perror_plus("fstat");
1642
} else {
1643
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1644
ret = fchown(pubkey_fd, uid, gid);
1645
if(ret == -1){
1646
perror_plus("fchown");
1647
}
1648
}
1649
}
1650
TEMP_FAILURE_RETRY(close(pubkey_fd));
1651
}
1652
}
1653
1654
/* Lower privileges */
1655
errno = 0;
1656
ret = seteuid(uid);
1657
if(ret == -1){
1658
perror_plus("seteuid");
1659
}
1660
}
1661
1662
/* Find network hooks and run them */
1663
{
1664
struct dirent **direntries;
1665
struct dirent *direntry;
1666
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1667
alphasort);
1668
int devnull = open("/dev/null", O_RDONLY);
1669
for(int i = 0; i < numhooks; i++){
1670
direntry = direntries[0];
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror_plus("asprintf");
1676
continue;
1677
}
1678
pid_t hook_pid = fork();
1679
if(hook_pid == 0){
1680
/* Child */
1681
dup2(devnull, STDIN_FILENO);
1682
close(devnull);
1683
dup2(STDERR_FILENO, STDOUT_FILENO);
1684
setenv("DEVICE", interface, 1);
1685
setenv("VERBOSE", debug ? "1" : "0", 1);
1686
setenv("MODE", "start", 1);
1687
/* setenv( XXX more here */
1688
ret = execl(fullname, direntry->d_name, "start");
1689
perror_plus("execl");
1690
}
1691
free(fullname);
1692
if(quit_now){
2211
2212
/* Re-raise privileges */
2213
ret_errno = raise_privileges();
2214
if(ret_errno != 0){
2215
errno = ret_errno;
2216
perror_plus("Failed to raise privileges");
2217
} else {
2218
struct stat st;
2219
2220
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2221
int seckey_fd = open(seckey, O_RDONLY);
2222
if(seckey_fd == -1){
2223
perror_plus("open");
2224
} else {
2225
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2226
if(ret == -1){
2227
perror_plus("fstat");
2228
} else {
2229
if(S_ISREG(st.st_mode)
2230
and st.st_uid == 0 and st.st_gid == 0){
2231
ret = fchown(seckey_fd, uid, gid);
2232
if(ret == -1){
2233
perror_plus("fchown");
2234
}
2235
}
2236
}
2237
TEMP_FAILURE_RETRY(close(seckey_fd));
2238
}
2239
}
2240
2241
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2242
int pubkey_fd = open(pubkey, O_RDONLY);
2243
if(pubkey_fd == -1){
2244
perror_plus("open");
2245
} else {
2246
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2247
if(ret == -1){
2248
perror_plus("fstat");
2249
} else {
2250
if(S_ISREG(st.st_mode)
2251
and st.st_uid == 0 and st.st_gid == 0){
2252
ret = fchown(pubkey_fd, uid, gid);
2253
if(ret == -1){
2254
perror_plus("fchown");
2255
}
2256
}
2257
}
2258
TEMP_FAILURE_RETRY(close(pubkey_fd));
2259
}
2260
}
2261
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
}
2270
2271
/* Remove invalid interface names (except "none") */
2272
{
2273
char *interface = NULL;
2274
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2275
interface))){
2276
if(strcmp(interface, "none") != 0
2277
and if_nametoindex(interface) == 0){
2278
if(interface[0] != '\0'){
2279
fprintf_plus(stderr, "Not using nonexisting interface"
2280
" \"%s\"\n", interface);
2281
}
2282
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2283
interface = NULL;
2284
}
2285
}
2286
}
2287
2288
/* Run network hooks */
2289
{
2290
if(mc.interfaces != NULL){
2291
interfaces_hooks = malloc(mc.interfaces_size);
2292
if(interfaces_hooks == NULL){
2293
perror_plus("malloc");
1693
2294
goto end;
1694
2295
}
2296
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2297
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1695
2298
}
1696
close(devnull);
2299
run_network_hooks("start", interfaces_hooks != NULL ?
2300
interfaces_hooks : "", delay);
1697
2301
}
1698
2302
1699
2303
if(not debug){
1700
2304
avahi_set_log_function(empty_log);
1701
2305
}
1702
2306
1703
if(interface[0] == '\0'){
1704
struct dirent **direntries;
1705
ret = scandir(sys_class_net, &direntries, good_interface,
1706
alphasort);
1707
if(ret >= 1){
1708
/* Pick the first good interface */
1709
interface = strdup(direntries[0]->d_name);
1710
if(debug){
1711
fprintf(stderr, "Using interface \"%s\"\n", interface);
1712
}
1713
if(interface == NULL){
1714
perror_plus("malloc");
1715
free(direntries);
1716
exitcode = EXIT_FAILURE;
1717
goto end;
1718
}
1719
free(direntries);
1720
} else {
1721
free(direntries);
1722
fprintf(stderr, "Could not find a network interface\n");
1723
exitcode = EXIT_FAILURE;
1724
goto end;
1725
}
1726
}
1727
1728
2307
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1729
2308
from the signal handler */
1730
2309
/* Initialize the pseudo-RNG for Avahi */
1731
2310
srand((unsigned int) time(NULL));
1732
mc.simple_poll = avahi_simple_poll_new();
1733
if(mc.simple_poll == NULL){
1734
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2311
simple_poll = avahi_simple_poll_new();
2312
if(simple_poll == NULL){
2313
fprintf_plus(stderr,
2314
"Avahi: Failed to create simple poll object.\n");
1735
2315
exitcode = EX_UNAVAILABLE;
1736
2316
goto end;
1737
2317
}
1799
2379
}
1800
2380
}
1801
2381
1802
/* If the interface is down, bring it up */
1803
if(strcmp(interface, "none") != 0){
1804
if_index = (AvahiIfIndex) if_nametoindex(interface);
1805
if(if_index == 0){
1806
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1807
exitcode = EX_UNAVAILABLE;
1808
goto end;
1809
}
1810
1811
if(quit_now){
1812
goto end;
1813
}
1814
1815
/* Re-raise priviliges */
1816
errno = 0;
1817
ret = seteuid(0);
1818
if(ret == -1){
1819
perror_plus("seteuid");
1820
}
1821
1822
#ifdef __linux__
1823
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1824
messages about the network interface to mess up the prompt */
1825
ret = klogctl(8, NULL, 5);
1826
bool restore_loglevel = true;
1827
if(ret == -1){
1828
restore_loglevel = false;
1829
perror_plus("klogctl");
1830
}
1831
#endif /* __linux__ */
1832
1833
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1834
if(sd < 0){
1835
perror_plus("socket");
1836
exitcode = EX_OSERR;
1837
#ifdef __linux__
1838
if(restore_loglevel){
1839
ret = klogctl(7, NULL, 0);
1840
if(ret == -1){
1841
perror_plus("klogctl");
1842
}
1843
}
1844
#endif /* __linux__ */
1845
/* Lower privileges */
1846
errno = 0;
1847
ret = seteuid(uid);
1848
if(ret == -1){
1849
perror_plus("seteuid");
1850
}
1851
goto end;
1852
}
1853
strcpy(network.ifr_name, interface);
1854
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1855
if(ret == -1){
1856
perror_plus("ioctl SIOCGIFFLAGS");
1857
#ifdef __linux__
1858
if(restore_loglevel){
1859
ret = klogctl(7, NULL, 0);
1860
if(ret == -1){
1861
perror_plus("klogctl");
1862
}
1863
}
1864
#endif /* __linux__ */
1865
exitcode = EX_OSERR;
1866
/* Lower privileges */
1867
errno = 0;
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
1872
goto end;
1873
}
1874
if((network.ifr_flags & IFF_UP) == 0){
1875
network.ifr_flags |= IFF_UP;
1876
take_down_interface = true;
1877
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1878
if(ret == -1){
1879
take_down_interface = false;
1880
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1881
exitcode = EX_OSERR;
1882
#ifdef __linux__
1883
if(restore_loglevel){
1884
ret = klogctl(7, NULL, 0);
1885
if(ret == -1){
1886
perror_plus("klogctl");
2382
/* If no interfaces were specified, make a list */
2383
if(mc.interfaces == NULL){
2384
struct dirent **direntries = NULL;
2385
/* Look for any good interfaces */
2386
ret = scandir(sys_class_net, &direntries, good_interface,
2387
alphasort);
2388
if(ret >= 1){
2389
/* Add all found interfaces to interfaces list */
2390
for(int i = 0; i < ret; ++i){
2391
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2392
direntries[i]->d_name);
2393
if(ret_errno != 0){
2394
errno = ret_errno;
2395
perror_plus("argz_add");
2396
free(direntries[i]);
2397
continue;
2398
}
2399
if(debug){
2400
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2401
direntries[i]->d_name);
2402
}
2403
free(direntries[i]);
2404
}
2405
free(direntries);
2406
} else {
2407
if(ret == 0){
2408
free(direntries);
2409
}
2410
fprintf_plus(stderr, "Could not find a network interface\n");
2411
exitcode = EXIT_FAILURE;
2412
goto end;
2413
}
2414
}
2415
2416
/* Bring up interfaces which are down, and remove any "none"s */
2417
{
2418
char *interface = NULL;
2419
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2420
interface))){
2421
/* If interface name is "none", stop bringing up interfaces.
2422
Also remove all instances of "none" from the list */
2423
if(strcmp(interface, "none") == 0){
2424
argz_delete(&mc.interfaces, &mc.interfaces_size,
2425
interface);
2426
interface = NULL;
2427
while((interface = argz_next(mc.interfaces,
2428
mc.interfaces_size, interface))){
2429
if(strcmp(interface, "none") == 0){
2430
argz_delete(&mc.interfaces, &mc.interfaces_size,
2431
interface);
2432
interface = NULL;
1887
2433
}
1888
2434
}
1889
#endif /* __linux__ */
1890
/* Lower privileges */
1891
errno = 0;
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
goto end;
1897
}
1898
}
1899
/* Sleep checking until interface is running.
1900
Check every 0.25s, up to total time of delay */
1901
for(int i=0; i < delay * 4; i++){
1902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1903
if(ret == -1){
1904
perror_plus("ioctl SIOCGIFFLAGS");
1905
} else if(network.ifr_flags & IFF_RUNNING){
1906
2435
break;
1907
2436
}
1908
struct timespec sleeptime = { .tv_nsec = 250000000 };
1909
ret = nanosleep(&sleeptime, NULL);
1910
if(ret == -1 and errno != EINTR){
1911
perror_plus("nanosleep");
1912
}
1913
}
1914
if(not take_down_interface){
1915
/* We won't need the socket anymore */
1916
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1917
if(ret == -1){
1918
perror_plus("close");
1919
}
1920
}
1921
#ifdef __linux__
1922
if(restore_loglevel){
1923
/* Restores kernel loglevel to default */
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
if(take_down_interface){
1933
/* Lower privileges */
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
} else {
1939
/* Lower privileges permanently */
1940
ret = setuid(uid);
1941
if(ret == -1){
1942
perror_plus("setuid");
1943
}
1944
}
2437
bool interface_was_up = interface_is_up(interface);
2438
errno = bring_up_interface(interface, delay);
2439
if(not interface_was_up){
2440
if(errno != 0){
2441
perror_plus("Failed to bring up interface");
2442
} else {
2443
errno = argz_add(&interfaces_to_take_down,
2444
&interfaces_to_take_down_size,
2445
interface);
2446
if(errno != 0){
2447
perror_plus("argz_add");
2448
}
2449
}
2450
}
2451
}
2452
if(debug and (interfaces_to_take_down == NULL)){
2453
fprintf_plus(stderr, "No interfaces were brought up\n");
2454
}
2455
}
2456
2457
/* If we only got one interface, explicitly use only that one */
2458
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2459
if(debug){
2460
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2461
mc.interfaces);
2462
}
2463
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1945
2464
}
1946
2465
1947
2466
if(quit_now){
1948
2467
goto end;
1949
2468
}
1950
2469
1951
ret = init_gnutls_global(pubkey, seckey);
2470
ret = init_gnutls_global(pubkey, seckey, &mc);
1952
2471
if(ret == -1){
1953
fprintf(stderr, "init_gnutls_global failed\n");
2472
fprintf_plus(stderr, "init_gnutls_global failed\n");
1954
2473
exitcode = EX_UNAVAILABLE;
1955
2474
goto end;
1956
2475
} else {
1961
2480
goto end;
1962
2481
}
1963
2482
1964
if(mkdtemp(tempdir) == NULL){
2483
/* Try /run/tmp before /tmp */
2484
tempdir = mkdtemp(run_tempdir);
2485
if(tempdir == NULL and errno == ENOENT){
2486
if(debug){
2487
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2488
run_tempdir, old_tempdir);
2489
}
2490
tempdir = mkdtemp(old_tempdir);
2491
}
2492
if(tempdir == NULL){
1965
2493
perror_plus("mkdtemp");
1966
2494
goto end;
1967
2495
}
1968
tempdir_created = true;
1969
2496
1970
2497
if(quit_now){
1971
2498
goto end;
1972
2499
}
1973
2500
1974
if(not init_gpgme(pubkey, seckey, tempdir)){
1975
fprintf(stderr, "init_gpgme failed\n");
2501
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2502
fprintf_plus(stderr, "init_gpgme failed\n");
1976
2503
exitcode = EX_UNAVAILABLE;
1977
2504
goto end;
1978
2505
} else {
1987
2514
/* Connect directly, do not use Zeroconf */
1988
2515
/* (Mainly meant for debugging) */
1989
2516
char *address = strrchr(connect_to, ':');
2517
1990
2518
if(address == NULL){
1991
fprintf(stderr, "No colon in address\n");
2519
fprintf_plus(stderr, "No colon in address\n");
1992
2520
exitcode = EX_USAGE;
1993
2521
goto end;
1994
2522
}
1997
2525
goto end;
1998
2526
}
1999
2527
2000
uint16_t port;
2528
in_port_t port;
2001
2529
errno = 0;
2002
2530
tmpmax = strtoimax(address+1, &tmp, 10);
2003
2531
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2004
or tmpmax != (uint16_t)tmpmax){
2005
fprintf(stderr, "Bad port number\n");
2532
or tmpmax != (in_port_t)tmpmax){
2533
fprintf_plus(stderr, "Bad port number\n");
2006
2534
exitcode = EX_USAGE;
2007
2535
goto end;
2008
2536
}
2009
2537
2010
2538
if(quit_now){
2011
2539
goto end;
2012
2540
}
2013
2541
2014
port = (uint16_t)tmpmax;
2542
port = (in_port_t)tmpmax;
2015
2543
*address = '\0';
2016
2544
/* Colon in address indicates IPv6 */
2017
2545
int af;
2033
2561
}
2034
2562
2035
2563
while(not quit_now){
2036
ret = start_mandos_communication(address, port, if_index, af);
2564
ret = start_mandos_communication(address, port, if_index, af,
2565
&mc);
2037
2566
if(quit_now or ret == 0){
2038
2567
break;
2039
2568
}
2040
2569
if(debug){
2041
fprintf(stderr, "Retrying in %d seconds\n",
2042
(int)retry_interval);
2570
fprintf_plus(stderr, "Retrying in %d seconds\n",
2571
(int)retry_interval);
2043
2572
}
2044
sleep((int)retry_interval);
2573
sleep((unsigned int)retry_interval);
2045
2574
}
2046
2575
2047
if (not quit_now){
2576
if(not quit_now){
2048
2577
exitcode = EXIT_SUCCESS;
2049
2578
}
2050
2579
2065
2594
config.publish_domain = 0;
2066
2595
2067
2596
/* Allocate a new server */
2068
mc.server = avahi_server_new(avahi_simple_poll_get
2069
(mc.simple_poll), &config, NULL,
2070
NULL, &error);
2597
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2598
&config, NULL, NULL, &ret_errno);
2071
2599
2072
2600
/* Free the Avahi configuration data */
2073
2601
avahi_server_config_free(&config);
2075
2603
2076
2604
/* Check if creating the Avahi server object succeeded */
2077
2605
if(mc.server == NULL){
2078
fprintf(stderr, "Failed to create Avahi server: %s\n",
2079
avahi_strerror(error));
2606
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2607
avahi_strerror(ret_errno));
2080
2608
exitcode = EX_UNAVAILABLE;
2081
2609
goto end;
2082
2610
}
2088
2616
/* Create the Avahi service browser */
2089
2617
sb = avahi_s_service_browser_new(mc.server, if_index,
2090
2618
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2091
NULL, 0, browse_callback, NULL);
2619
NULL, 0, browse_callback,
2620
(void *)&mc);
2092
2621
if(sb == NULL){
2093
fprintf(stderr, "Failed to create service browser: %s\n",
2094
avahi_strerror(avahi_server_errno(mc.server)));
2622
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2623
avahi_strerror(avahi_server_errno(mc.server)));
2095
2624
exitcode = EX_UNAVAILABLE;
2096
2625
goto end;
2097
2626
}
2103
2632
/* Run the main loop */
2104
2633
2105
2634
if(debug){
2106
fprintf(stderr, "Starting Avahi loop search\n");
2635
fprintf_plus(stderr, "Starting Avahi loop search\n");
2107
2636
}
2108
2109
ret = avahi_loop_with_timeout(mc.simple_poll,
2110
(int)(retry_interval * 1000));
2637
2638
ret = avahi_loop_with_timeout(simple_poll,
2639
(int)(retry_interval * 1000), &mc);
2111
2640
if(debug){
2112
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2113
(ret == 0) ? "successfully" : "with error");
2641
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2642
(ret == 0) ? "successfully" : "with error");
2114
2643
}
2115
2644
2116
2645
end:
2117
2646
2118
2647
if(debug){
2119
fprintf(stderr, "%s exiting\n", argv[0]);
2648
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2120
2649
}
2121
2650
2122
2651
/* Cleanup things */
2652
free(mc.interfaces);
2653
2123
2654
if(sb != NULL)
2124
2655
avahi_s_service_browser_free(sb);
2125
2656
2126
2657
if(mc.server != NULL)
2127
2658
avahi_server_free(mc.server);
2128
2659
2129
if(mc.simple_poll != NULL)
2130
avahi_simple_poll_free(mc.simple_poll);
2660
if(simple_poll != NULL)
2661
avahi_simple_poll_free(simple_poll);
2131
2662
2132
2663
if(gnutls_initialized){
2133
2664
gnutls_certificate_free_credentials(mc.cred);
2138
2669
if(gpgme_initialized){
2139
2670
gpgme_release(mc.ctx);
2140
2671
}
2141
2672
2142
2673
/* Cleans up the circular linked list of Mandos servers the client
2143
2674
has seen */
2144
2675
if(mc.current_server != NULL){
2145
2676
mc.current_server->prev->next = NULL;
2146
2677
while(mc.current_server != NULL){
2147
2678
server *next = mc.current_server->next;
2679
#ifdef __GNUC__
2680
#pragma GCC diagnostic push
2681
#pragma GCC diagnostic ignored "-Wcast-qual"
2682
#endif
2683
free((char *)(mc.current_server->ip));
2684
#ifdef __GNUC__
2685
#pragma GCC diagnostic pop
2686
#endif
2148
2687
free(mc.current_server);
2149
2688
mc.current_server = next;
2150
2689
}
2151
2690
}
2152
2691
2153
/* XXX run network hooks "stop" here */
2154
2155
/* Take down the network interface */
2156
if(take_down_interface){
2157
/* Re-raise priviliges */
2158
errno = 0;
2159
ret = seteuid(0);
2160
if(ret == -1){
2161
perror_plus("seteuid");
2692
/* Re-raise privileges */
2693
{
2694
ret_errno = raise_privileges();
2695
if(ret_errno != 0){
2696
errno = ret_errno;
2697
perror_plus("Failed to raise privileges");
2698
} else {
2699
2700
/* Run network hooks */
2701
run_network_hooks("stop", interfaces_hooks != NULL ?
2702
interfaces_hooks : "", delay);
2703
2704
/* Take down the network interfaces which were brought up */
2705
{
2706
char *interface = NULL;
2707
while((interface=argz_next(interfaces_to_take_down,
2708
interfaces_to_take_down_size,
2709
interface))){
2710
ret_errno = take_down_interface(interface);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("Failed to take down interface");
2714
}
2715
}
2716
if(debug and (interfaces_to_take_down == NULL)){
2717
fprintf_plus(stderr, "No interfaces needed to be taken"
2718
" down\n");
2719
}
2720
}
2162
2721
}
2163
if(geteuid() == 0){
2164
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2165
if(ret == -1){
2166
perror_plus("ioctl SIOCGIFFLAGS");
2167
} else if(network.ifr_flags & IFF_UP) {
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2170
if(ret == -1){
2171
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2172
}
2173
}
2174
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2175
if(ret == -1){
2176
perror_plus("close");
2177
}
2178
/* Lower privileges permanently */
2179
errno = 0;
2180
ret = setuid(uid);
2181
if(ret == -1){
2182
perror_plus("setuid");
2183
}
2722
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("Failed to lower privileges permanently");
2184
2727
}
2185
2728
}
2186
2729
2730
free(interfaces_to_take_down);
2731
free(interfaces_hooks);
2732
2187
2733
/* Removes the GPGME temp directory and all files inside */
2188
if(tempdir_created){
2734
if(tempdir != NULL){
2189
2735
struct dirent **direntries = NULL;
2190
struct dirent *direntry = NULL;
2191
int numentries = scandir(tempdir, &direntries, notdotentries,
2192
alphasort);
2193
if (numentries > 0){
2194
for(int i = 0; i < numentries; i++){
2195
direntry = direntries[i];
2196
char *fullname = NULL;
2197
ret = asprintf(&fullname, "%s/%s", tempdir,
2198
direntry->d_name);
2199
if(ret < 0){
2200
perror_plus("asprintf");
2201
continue;
2202
}
2203
ret = remove(fullname);
2204
if(ret == -1){
2205
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2206
strerror(errno));
2207
}
2208
free(fullname);
2736
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2737
O_NOFOLLOW));
2738
if(tempdir_fd == -1){
2739
perror_plus("open");
2740
} else {
2741
#ifdef __GLIBC__
2742
#if __GLIBC_PREREQ(2, 15)
2743
int numentries = scandirat(tempdir_fd, ".", &direntries,
2744
notdotentries, alphasort);
2745
#else /* not __GLIBC_PREREQ(2, 15) */
2746
int numentries = scandir(tempdir, &direntries, notdotentries,
2747
alphasort);
2748
#endif /* not __GLIBC_PREREQ(2, 15) */
2749
#else /* not __GLIBC__ */
2750
int numentries = scandir(tempdir, &direntries, notdotentries,
2751
alphasort);
2752
#endif /* not __GLIBC__ */
2753
if(numentries >= 0){
2754
for(int i = 0; i < numentries; i++){
2755
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2756
if(ret == -1){
2757
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2758
" \"%s\", 0): %s\n", tempdir,
2759
direntries[i]->d_name, strerror(errno));
2760
}
2761
free(direntries[i]);
2762
}
2763
2764
/* need to clean even if 0 because man page doesn't specify */
2765
free(direntries);
2766
if(numentries == -1){
2767
perror_plus("scandir");
2768
}
2769
ret = rmdir(tempdir);
2770
if(ret == -1 and errno != ENOENT){
2771
perror_plus("rmdir");
2772
}
2209
2773
}
2210
}
2211
2212
/* need to clean even if 0 because man page doesn't specify */
2213
free(direntries);
2214
if (numentries == -1){
2215
perror_plus("scandir");
2216
}
2217
ret = rmdir(tempdir);
2218
if(ret == -1 and errno != ENOENT){
2219
perror_plus("rmdir");
2774
TEMP_FAILURE_RETRY(close(tempdir_fd));
2220
2775
}
2221
2776
}
2222
2777
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0