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- Committer: Teddy Hogeborn
- Date: 2014-03-06 02:26:04 UTC
- Revision ID: teddy@recompile.se-20140306022604-4uc43taz25cflgi3
Bug fix: Free all memory and give better messages when memory is full.
* plugin-runner.c (add_to_char_array): Bug fix: If realloc fails, do
not change old array pointer.
(add_environment): Bug fix: If realloc fails, do not change old
environment pointer. Also rename "e" to "envdef"
for clarity.
(main): Bug fix: If realloc fails, do not change old pointers. Also
wrap "#pragma GCC" with "#ifdef ___GNUC___".
* plugins.d/mandos-client.c (incbuffer): Bug fix: if realloc fails,
free old buffer.
(run_network_hooks): Moved variables "directory" and "ret" to their
innermost possible scope.
(take_down_interface): Moved variables "sd", "ret_errno", and
"ret_setflags" to their innermost possible
scope.
(main): Removed variable "interfaces_hooks_size". Also, if argz_add
fails when adding all found interfaces, the error message
will now be correct. Also print error message if, after
having taken up an interface, argz_add fails to add
interface to list of interfaces to be taken down.
* plugins.d/mandos-client.xml (OPTIONS): Explain better what "none"
means as argument to
"--interface" by negating
sense.
* plugins.d/password-prompt.c (fprintf_plus): Removed (unused).
* plugin-runner.c (add_to_char_array): Bug fix: If realloc fails, do
not change old array pointer.
(add_environment): Bug fix: If realloc fails, do not change old
environment pointer. Also rename "e" to "envdef"
for clarity.
(main): Bug fix: If realloc fails, do not change old pointers. Also
wrap "#pragma GCC" with "#ifdef ___GNUC___".
* plugins.d/mandos-client.c (incbuffer): Bug fix: if realloc fails,
free old buffer.
(run_network_hooks): Moved variables "directory" and "ret" to their
innermost possible scope.
(take_down_interface): Moved variables "sd", "ret_errno", and
"ret_setflags" to their innermost possible
scope.
(main): Removed variable "interfaces_hooks_size". Also, if argz_add
fails when adding all found interfaces, the error message
will now be correct. Also print error message if, after
having taken up an interface, argz_add fails to add
interface to list of interfaces to be taken down.
* plugins.d/mandos-client.xml (OPTIONS): Explain better what "none"
means as argument to
"--interface" by negating
sense.
* plugins.d/password-prompt.c (fprintf_plus): Removed (unused).
- files added:
- debian/mandos-client.examples
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
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() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
64
#include <errno.h> /* perror(), errno,
66
65
program_invocation_short_name */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
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getuid(), getgid(), seteuid(),
76
setgid(), pause() */
75
setgid(), pause(), _exit() */
77
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#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
77
#include <iso646.h> /* not, or, and */
79
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#include <argp.h> /* struct argp_option, error_t, struct
87
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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
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WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
90
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91
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#ifdef __linux__
92
96
#include <sys/klog.h> /* klogctl() */
134
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static const char sys_class_net[] = "/sys/class/net";
135
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char *connect_to = NULL;
136
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
137
143
138
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/* Doubly linked list that need to be circularly linked when used */
139
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typedef struct server{
140
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const char *ip;
141
uint16_t port;
147
in_port_t port;
142
148
AvahiIfIndex if_index;
143
149
int af;
144
150
struct timespec last_seen;
148
154
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/* Used for passing in values through the Avahi callback functions */
150
156
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
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AvahiServer *server;
153
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gnutls_certificate_credentials_t cred;
154
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unsigned int dh_bits;
156
161
const char *priority;
157
162
gpgme_ctx_t ctx;
158
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
159
166
} mandos_context;
160
167
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
166
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sig_atomic_t quit_now = 0;
168
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int signal_received = 0;
169
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/* Function to use when printing errors */
171
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void perror_plus(const char *print_text){
176
int e = errno;
172
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fprintf(stderr, "Mandos plugin %s: ",
173
178
program_invocation_short_name);
179
errno = e;
174
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perror(print_text);
175
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}
176
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__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
177
193
/*
178
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
195
* bytes. "buffer_capacity" is how much is currently allocated,
182
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size_t incbuffer(char **buffer, size_t buffer_length,
183
199
size_t buffer_capacity){
184
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
201
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(new_buf == NULL){
203
int old_errno = errno;
204
free(*buffer);
205
errno = old_errno;
206
*buffer = NULL;
187
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return 0;
188
208
}
209
*buffer = new_buf;
189
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buffer_capacity += BUFFER_SIZE;
190
211
}
191
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return buffer_capacity;
192
213
}
193
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/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
216
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
int af, server **current_server){
197
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int ret;
198
219
server *new_server = malloc(sizeof(server));
199
220
if(new_server == NULL){
200
221
perror_plus("malloc");
201
return -1;
222
return false;
202
223
}
203
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*new_server = (server){ .ip = strdup(ip),
204
225
.port = port,
206
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.af = af };
207
228
if(new_server->ip == NULL){
208
229
perror_plus("strdup");
209
return -1;
230
return false;
210
231
}
211
232
/* Special case of first server */
212
if (mc.current_server == NULL){
233
if(*current_server == NULL){
213
234
new_server->next = new_server;
214
235
new_server->prev = new_server;
215
mc.current_server = new_server;
236
*current_server = new_server;
216
237
/* Place the new server last in the list */
217
238
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
220
241
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
242
(*current_server)->prev = new_server;
222
243
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
224
245
if(ret == -1){
225
246
perror_plus("clock_gettime");
226
return -1;
247
return false;
227
248
}
228
return 0;
249
return true;
229
250
}
230
251
231
252
/*
232
253
* Initialize GPGME.
233
254
*/
234
255
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
256
const char *tempdir, mandos_context *mc){
236
257
gpgme_error_t rc;
237
258
gpgme_engine_info_t engine_info;
238
259
239
240
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/*
241
261
* Helper function to insert pub and seckey to the engine keyring.
242
262
*/
253
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rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
275
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
259
278
return false;
260
279
}
261
280
262
rc = gpgme_op_import(mc.ctx, pgp_data);
281
rc = gpgme_op_import(mc->ctx, pgp_data);
263
282
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
267
285
return false;
268
286
}
269
287
276
294
}
277
295
278
296
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
297
fprintf_plus(stderr, "Initializing GPGME\n");
281
298
}
282
299
283
300
/* Init GPGME */
284
301
gpgme_check_version(NULL);
285
302
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
303
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
304
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
305
gpgme_strsource(rc), gpgme_strerror(rc));
290
306
return false;
291
307
}
292
308
293
309
/* Set GPGME home directory for the OpenPGP engine only */
294
310
rc = gpgme_get_engine_info(&engine_info);
295
311
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
312
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
299
314
return false;
300
315
}
301
316
while(engine_info != NULL){
307
322
engine_info = engine_info->next;
308
323
}
309
324
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
325
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
326
tempdir);
312
327
return false;
313
328
}
314
329
315
330
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
331
rc = gpgme_new(&(mc->ctx));
317
332
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
333
fprintf_plus(stderr, "Mandos plugin mandos-client: "
334
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
335
gpgme_strerror(rc));
321
336
return false;
322
337
}
323
338
334
349
*/
335
350
static ssize_t pgp_packet_decrypt(const char *cryptotext,
336
351
size_t crypto_size,
337
char **plaintext){
352
char **plaintext,
353
mandos_context *mc){
338
354
gpgme_data_t dh_crypto, dh_plain;
339
355
gpgme_error_t rc;
340
356
ssize_t ret;
342
358
ssize_t plaintext_length = 0;
343
359
344
360
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
361
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
347
362
}
348
363
349
364
/* Create new GPGME data buffer from memory cryptotext */
350
365
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
366
0);
352
367
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
368
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
369
gpgme_strsource(rc), gpgme_strerror(rc));
356
370
return -1;
357
371
}
358
372
359
373
/* Create new empty GPGME data buffer for the plaintext */
360
374
rc = gpgme_data_new(&dh_plain);
361
375
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "Mandos plugin mandos-client: "
377
"bad gpgme_data_new: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
365
379
gpgme_data_release(dh_crypto);
366
380
return -1;
367
381
}
368
382
369
383
/* Decrypt data from the cryptotext data buffer to the plaintext
370
384
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
386
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
387
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
376
389
plaintext_length = -1;
377
390
if(debug){
378
391
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
392
result = gpgme_op_decrypt_result(mc->ctx);
380
393
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
394
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
395
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
396
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
397
result->unsupported_algorithm);
398
fprintf_plus(stderr, "Wrong key usage: %u\n",
399
result->wrong_key_usage);
390
400
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
401
fprintf_plus(stderr, "File name: %s\n", result->file_name);
393
402
}
394
403
gpgme_recipient_t recipient;
395
404
recipient = result->recipients;
396
405
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
406
fprintf_plus(stderr, "Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name
408
(recipient->pubkey_algo));
409
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
410
fprintf_plus(stderr, "Secret key available: %s\n",
411
recipient->status == GPG_ERR_NO_SECKEY
412
? "No" : "Yes");
406
413
recipient = recipient->next;
407
414
}
408
415
}
411
418
}
412
419
413
420
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
421
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
416
422
}
417
423
418
424
/* Seek back to the beginning of the GPGME plaintext data buffer */
449
455
}
450
456
451
457
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
458
fprintf_plus(stderr, "Decrypted password is: ");
454
459
for(ssize_t i = 0; i < plaintext_length; i++){
455
460
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
461
}
468
473
}
469
474
470
475
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
476
const char *ret = gnutls_strerror(value);
473
477
if(ret == NULL)
474
478
ret = "(unknown)";
475
479
return ret;
478
482
/* GnuTLS log function callback */
479
483
static void debuggnutls(__attribute__((unused)) int level,
480
484
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
485
fprintf_plus(stderr, "GnuTLS: %s", string);
482
486
}
483
487
484
488
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
489
const char *seckeyfilename,
490
mandos_context *mc){
486
491
int ret;
487
492
488
493
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
494
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
495
}
492
496
493
497
ret = gnutls_global_init();
494
498
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
499
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
500
safer_gnutls_strerror(ret));
497
501
return -1;
498
502
}
499
503
506
510
}
507
511
508
512
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
514
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
515
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
safer_gnutls_strerror(ret));
513
517
gnutls_global_deinit();
514
518
return -1;
515
519
}
516
520
517
521
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
seckeyfilename);
522
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
523
" secret key %s as GnuTLS credentials\n",
524
pubkeyfilename,
525
seckeyfilename);
522
526
}
523
527
524
528
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
529
(mc->cred, pubkeyfilename, seckeyfilename,
526
530
GNUTLS_OPENPGP_FMT_BASE64);
527
531
if(ret != GNUTLS_E_SUCCESS){
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
532
fprintf_plus(stderr,
533
"Error[%d] while reading the OpenPGP key pair ('%s',"
534
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
535
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
536
safer_gnutls_strerror(ret));
534
537
goto globalfail;
535
538
}
536
539
537
540
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
541
ret = gnutls_dh_params_init(&mc->dh_params);
539
542
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
543
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
" initialization: %s\n",
545
safer_gnutls_strerror(ret));
543
546
goto globalfail;
544
547
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
549
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
550
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
safer_gnutls_strerror(ret));
550
552
goto globalfail;
551
553
}
552
554
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
556
555
557
return 0;
556
558
557
559
globalfail:
558
560
559
gnutls_certificate_free_credentials(mc.cred);
561
gnutls_certificate_free_credentials(mc->cred);
560
562
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
563
gnutls_dh_params_deinit(mc->dh_params);
562
564
return -1;
563
565
}
564
566
565
static int init_gnutls_session(gnutls_session_t *session){
567
static int init_gnutls_session(gnutls_session_t *session,
568
mandos_context *mc){
566
569
int ret;
567
570
/* GnuTLS session creation */
568
571
do {
572
575
}
573
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
577
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
578
fprintf_plus(stderr,
579
"Error in GnuTLS session initialization: %s\n",
580
safer_gnutls_strerror(ret));
578
581
}
579
582
580
583
{
581
584
const char *err;
582
585
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
586
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
587
if(quit_now){
585
588
gnutls_deinit(*session);
586
589
return -1;
587
590
}
588
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
592
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
593
fprintf_plus(stderr, "Syntax error at: %s\n", err);
594
fprintf_plus(stderr, "GnuTLS error: %s\n",
595
safer_gnutls_strerror(ret));
594
596
gnutls_deinit(*session);
595
597
return -1;
596
598
}
598
600
599
601
do {
600
602
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
603
mc->cred);
602
604
if(quit_now){
603
605
gnutls_deinit(*session);
604
606
return -1;
605
607
}
606
608
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
609
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
610
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
611
612
gnutls_deinit(*session);
612
613
return -1;
613
614
}
615
616
/* ignore client certificate if any. */
616
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
617
618
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
619
620
620
621
return 0;
621
622
}
625
626
__attribute__((unused)) const char *txt){}
626
627
627
628
/* Called when a Mandos server is found */
628
static int start_mandos_communication(const char *ip, uint16_t port,
629
static int start_mandos_communication(const char *ip, in_port_t port,
629
630
AvahiIfIndex if_index,
630
int af){
631
int af, mandos_context *mc){
631
632
int ret, tcp_sd = -1;
632
633
ssize_t sret;
633
634
union {
658
659
pf = PF_INET;
659
660
break;
660
661
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
663
errno = EINVAL;
664
664
return -1;
665
665
}
666
666
667
ret = init_gnutls_session(&session);
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
668
700
if(ret != 0){
669
701
return -1;
670
702
}
671
703
672
704
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
676
707
}
677
708
678
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
704
735
}
705
736
if(ret == 0){
706
737
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
739
errno = e;
710
740
goto mandos_end;
711
741
}
712
742
if(af == AF_INET6){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
717
748
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
720
753
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
754
fprintf_plus(stderr, "An IPv6 link-local address is"
755
" incomplete without a network interface\n");
724
756
errno = EINVAL;
725
757
goto mandos_end;
726
758
}
728
760
to.in6.sin6_scope_id = (uint32_t)if_index;
729
761
}
730
762
} else {
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
763
to.in.sin_port = htons(port);
734
764
}
735
765
736
766
if(quit_now){
744
774
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
775
perror_plus("if_indextoname");
746
776
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
777
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
778
"\n", ip, interface, (uintmax_t)port);
750
779
}
751
780
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
781
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
782
ip, (uintmax_t)port);
754
783
}
755
784
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
785
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
766
795
perror_plus("inet_ntop");
767
796
} else {
768
797
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
798
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
771
799
}
772
800
}
773
801
}
827
855
}
828
856
829
857
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
858
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
859
}
833
860
834
861
if(quit_now){
836
863
goto mandos_end;
837
864
}
838
865
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
866
/* This casting via intptr_t is to eliminate warning about casting
867
an int to a pointer type. This is exactly how the GnuTLS Guile
868
function "set-session-transport-fd!" does it. */
869
gnutls_transport_set_ptr(session,
870
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
841
871
842
872
if(quit_now){
843
873
errno = EINTR;
854
884
855
885
if(ret != GNUTLS_E_SUCCESS){
856
886
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
887
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
888
gnutls_perror(ret);
860
889
}
861
890
errno = EPROTO;
865
894
/* Read OpenPGP packet that contains the wanted password */
866
895
867
896
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
897
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
898
" %s\n", ip);
870
899
}
871
900
872
901
while(true){
910
939
}
911
940
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
941
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
942
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
943
"***\n");
915
944
gnutls_perror(ret);
916
945
errno = EPROTO;
917
946
goto mandos_end;
918
947
}
919
948
break;
920
949
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
950
fprintf_plus(stderr, "Unknown error while reading data from"
951
" encrypted session with Mandos server\n");
924
952
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
953
errno = EIO;
926
954
goto mandos_end;
931
959
}
932
960
933
961
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
962
fprintf_plus(stderr, "Closing TLS session\n");
936
963
}
937
964
938
965
if(quit_now){
951
978
if(buffer_length > 0){
952
979
ssize_t decrypted_buffer_size;
953
980
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
981
&decrypted_buffer, mc);
955
982
if(decrypted_buffer_size >= 0){
956
983
957
984
written = 0;
967
994
if(ret == 0 and ferror(stdout)){
968
995
int e = errno;
969
996
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
997
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
998
strerror(errno));
973
999
}
974
1000
errno = e;
975
1001
goto mandos_end;
1019
1045
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
1046
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
1047
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1048
void* mc){
1049
if(r == NULL){
1050
return;
1051
}
1024
1052
1025
1053
/* Called whenever a service has been resolved successfully or
1026
1054
timed out */
1032
1060
switch(event){
1033
1061
default:
1034
1062
case AVAHI_RESOLVER_FAILURE:
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
1037
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
avahi_strerror(avahi_server_errno(mc.server)));
1063
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1064
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1065
domain,
1066
avahi_strerror(avahi_server_errno
1067
(((mandos_context*)mc)->server)));
1039
1068
break;
1040
1069
1041
1070
case AVAHI_RESOLVER_FOUND:
1043
1072
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1073
avahi_address_snprint(ip, sizeof(ip), address);
1045
1074
if(debug){
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
ip, (intmax_t)interface, port);
1075
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1076
PRIdMAX ") on port %" PRIu16 "\n", name,
1077
host_name, ip, (intmax_t)interface, port);
1050
1078
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1079
int ret = start_mandos_communication(ip, (in_port_t)port,
1080
interface,
1081
avahi_proto_to_af(proto),
1082
mc);
1053
1083
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1084
avahi_simple_poll_quit(simple_poll);
1055
1085
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1086
if(not add_server(ip, (in_port_t)port, interface,
1087
avahi_proto_to_af(proto),
1088
&((mandos_context*)mc)->current_server)){
1089
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1090
" list\n", name);
1091
}
1058
1092
}
1059
1093
}
1060
1094
}
1070
1104
const char *domain,
1071
1105
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
1106
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1107
void* mc){
1108
if(b == NULL){
1109
return;
1110
}
1075
1111
1076
1112
/* Called whenever a new services becomes available on the LAN or
1077
1113
is removed from the LAN */
1084
1120
default:
1085
1121
case AVAHI_BROWSER_FAILURE:
1086
1122
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
1089
avahi_strerror(avahi_server_errno(mc.server)));
1090
avahi_simple_poll_quit(mc.simple_poll);
1123
fprintf_plus(stderr, "(Avahi browser) %s\n",
1124
avahi_strerror(avahi_server_errno
1125
(((mandos_context*)mc)->server)));
1126
avahi_simple_poll_quit(simple_poll);
1091
1127
return;
1092
1128
1093
1129
case AVAHI_BROWSER_NEW:
1096
1132
the callback function is called the Avahi server will free the
1097
1133
resolver for us. */
1098
1134
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
name, type, domain, protocol, 0,
1101
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
1104
name, avahi_strerror(avahi_server_errno(mc.server)));
1135
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1136
interface, protocol, name, type,
1137
domain, protocol, 0,
1138
resolve_callback, mc) == NULL)
1139
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1140
" %s\n", name,
1141
avahi_strerror(avahi_server_errno
1142
(((mandos_context*)mc)->server)));
1105
1143
break;
1106
1144
1107
1145
case AVAHI_BROWSER_REMOVE:
1110
1148
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1149
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1150
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1151
fprintf_plus(stderr, "No Mandos server found, still"
1152
" searching...\n");
1115
1153
}
1116
1154
break;
1117
1155
}
1126
1164
signal_received = sig;
1127
1165
int old_errno = errno;
1128
1166
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1131
1169
}
1132
1170
errno = old_errno;
1133
1171
}
1134
1172
1135
1173
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
1174
int ret;
1175
error_t ret_errno;
1137
1176
1138
1177
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
1178
if(s < 0){
1179
ret_errno = errno;
1140
1180
perror_plus("socket");
1181
errno = ret_errno;
1141
1182
return false;
1142
1183
}
1143
1184
strcpy(ifr->ifr_name, ifname);
1144
1185
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
1186
if(ret == -1){
1146
1187
if(debug){
1188
ret_errno = errno;
1147
1189
perror_plus("ioctl SIOCGIFFLAGS");
1190
errno = ret_errno;
1148
1191
}
1149
1192
return false;
1150
1193
}
1156
1199
/* Reject the loopback device */
1157
1200
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
1201
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1202
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1203
ifname);
1161
1204
}
1162
1205
return false;
1163
1206
}
1164
1207
/* Accept point-to-point devices only if connect_to is specified */
1165
1208
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
1209
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1210
fprintf_plus(stderr, "Accepting point-to-point interface"
1211
" \"%s\"\n", ifname);
1169
1212
}
1170
1213
return true;
1171
1214
}
1172
1215
/* Otherwise, reject non-broadcast-capable devices */
1173
1216
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
1217
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1218
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1219
" \"%s\"\n", ifname);
1177
1220
}
1178
1221
return false;
1179
1222
}
1180
1223
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1224
if(ifr->ifr_flags & IFF_NOARP){
1182
1225
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1226
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1227
ifname);
1185
1228
}
1186
1229
return false;
1187
1230
}
1188
1231
1189
1232
/* Accept this device */
1190
1233
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1234
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
1235
}
1194
1236
return true;
1195
1237
}
1207
1249
struct ifreq ifr;
1208
1250
if(not get_flags(if_entry->d_name, &ifr)){
1209
1251
if(debug){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1252
fprintf_plus(stderr, "Failed to get flags for interface "
1253
"\"%s\"\n", if_entry->d_name);
1254
}
1255
return 0;
1256
}
1257
1258
if(not good_flags(if_entry->d_name, &ifr)){
1259
return 0;
1260
}
1261
return 1;
1262
}
1263
1264
/*
1265
* This function determines if a network interface is up.
1266
*/
1267
bool interface_is_up(const char *interface){
1268
struct ifreq ifr;
1269
if(not get_flags(interface, &ifr)){
1270
if(debug){
1271
fprintf_plus(stderr, "Failed to get flags for interface "
1272
"\"%s\"\n", interface);
1273
}
1274
return false;
1275
}
1276
1277
return (bool)(ifr.ifr_flags & IFF_UP);
1278
}
1279
1280
/*
1281
* This function determines if a network interface is running
1282
*/
1283
bool interface_is_running(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1267
1294
}
1268
1295
1269
1296
int notdotentries(const struct dirent *direntry){
1295
1322
if((direntry->d_name)[sret] != '\0'){
1296
1323
/* Contains non-allowed characters */
1297
1324
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1325
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1326
direntry->d_name);
1301
1327
}
1302
1328
return 0;
1303
1329
}
1319
1345
if(not (S_ISREG(st.st_mode))){
1320
1346
/* Not a regular file */
1321
1347
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1348
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1349
direntry->d_name);
1325
1350
}
1326
1351
return 0;
1327
1352
}
1328
1353
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1354
/* Not executable */
1330
1355
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1356
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1357
direntry->d_name);
1334
1358
}
1335
1359
return 0;
1336
1360
}
1361
if(debug){
1362
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1363
direntry->d_name);
1364
}
1337
1365
return 1;
1338
1366
}
1339
1367
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1368
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
mandos_context *mc){
1341
1370
int ret;
1342
1371
struct timespec now;
1343
1372
struct timespec waited_time;
1344
1373
intmax_t block_time;
1345
1374
1346
1375
while(true){
1347
if(mc.current_server == NULL){
1376
if(mc->current_server == NULL){
1348
1377
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1378
fprintf_plus(stderr, "Wait until first server is found."
1379
" No timeout!\n");
1351
1380
}
1352
1381
ret = avahi_simple_poll_iterate(s, -1);
1353
1382
} else {
1354
1383
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1384
fprintf_plus(stderr, "Check current_server if we should run"
1385
" it, or wait\n");
1358
1386
}
1359
1387
/* the current time */
1360
1388
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
1393
/* Calculating in ms how long time between now and server
1366
1394
who we visted longest time ago. Now - last seen. */
1367
1395
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1396
- mc->current_server->last_seen.tv_sec);
1369
1397
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1398
- mc->current_server->last_seen.tv_nsec);
1371
1399
/* total time is 10s/10,000ms.
1372
1400
Converting to s from ms by dividing by 1,000,
1373
1401
and ns to ms by dividing by 1,000,000. */
1376
1404
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1405
1378
1406
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1407
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1408
block_time);
1381
1409
}
1382
1410
1383
1411
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1412
ret = start_mandos_communication(mc->current_server->ip,
1413
mc->current_server->port,
1414
mc->current_server->if_index,
1415
mc->current_server->af, mc);
1388
1416
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1417
avahi_simple_poll_quit(s);
1390
1418
return 0;
1391
1419
}
1392
1420
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1421
&mc->current_server->last_seen);
1394
1422
if(ret == -1){
1395
1423
perror_plus("clock_gettime");
1396
1424
return -1;
1397
1425
}
1398
mc.current_server = mc.current_server->next;
1426
mc->current_server = mc->current_server->next;
1399
1427
block_time = 0; /* Call avahi to find new Mandos
1400
1428
servers, but don't block */
1401
1429
}
1410
1438
}
1411
1439
}
1412
1440
1441
/* Set effective uid to 0, return errno */
1442
error_t raise_privileges(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = 0;
1445
if(seteuid(0) == -1){
1446
ret_errno = errno;
1447
perror_plus("seteuid");
1448
}
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
1453
/* Set effective and real user ID to 0. Return errno. */
1454
error_t raise_privileges_permanently(void){
1455
error_t old_errno = errno;
1456
error_t ret_errno = raise_privileges();
1457
if(ret_errno != 0){
1458
errno = old_errno;
1459
return ret_errno;
1460
}
1461
if(setuid(0) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective user ID to unprivileged saved user ID */
1470
error_t lower_privileges(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(seteuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("seteuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
/* Lower privileges permanently */
1482
error_t lower_privileges_permanently(void){
1483
error_t old_errno = errno;
1484
error_t ret_errno = 0;
1485
if(setuid(uid) == -1){
1486
ret_errno = errno;
1487
perror_plus("setuid");
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
bool run_network_hooks(const char *mode, const char *interface,
1494
const float delay){
1495
struct dirent **direntries;
1496
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1497
alphasort);
1498
if(numhooks == -1){
1499
if(errno == ENOENT){
1500
if(debug){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1503
}
1504
} else {
1505
perror_plus("scandir");
1506
}
1507
} else {
1508
struct dirent *direntry;
1509
int ret;
1510
int devnull = open("/dev/null", O_RDONLY);
1511
for(int i = 0; i < numhooks; i++){
1512
direntry = direntries[i];
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1515
if(ret < 0){
1516
perror_plus("asprintf");
1517
continue;
1518
}
1519
if(debug){
1520
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1521
direntry->d_name);
1522
}
1523
pid_t hook_pid = fork();
1524
if(hook_pid == 0){
1525
/* Child */
1526
/* Raise privileges */
1527
raise_privileges_permanently();
1528
/* Set group */
1529
errno = 0;
1530
ret = setgid(0);
1531
if(ret == -1){
1532
perror_plus("setgid");
1533
}
1534
/* Reset supplementary groups */
1535
errno = 0;
1536
ret = setgroups(0, NULL);
1537
if(ret == -1){
1538
perror_plus("setgroups");
1539
}
1540
dup2(devnull, STDIN_FILENO);
1541
close(devnull);
1542
dup2(STDERR_FILENO, STDOUT_FILENO);
1543
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("DEVICE", interface, 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
ret = setenv("MODE", mode, 1);
1559
if(ret == -1){
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
1563
char *delaystring;
1564
ret = asprintf(&delaystring, "%f", delay);
1565
if(ret == -1){
1566
perror_plus("asprintf");
1567
_exit(EX_OSERR);
1568
}
1569
ret = setenv("DELAY", delaystring, 1);
1570
if(ret == -1){
1571
free(delaystring);
1572
perror_plus("setenv");
1573
_exit(EX_OSERR);
1574
}
1575
free(delaystring);
1576
if(connect_to != NULL){
1577
ret = setenv("CONNECT", connect_to, 1);
1578
if(ret == -1){
1579
perror_plus("setenv");
1580
_exit(EX_OSERR);
1581
}
1582
}
1583
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1584
perror_plus("execl");
1585
_exit(EXIT_FAILURE);
1586
}
1587
} else {
1588
int status;
1589
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1590
perror_plus("waitpid");
1591
free(fullname);
1592
continue;
1593
}
1594
if(WIFEXITED(status)){
1595
if(WEXITSTATUS(status) != 0){
1596
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1597
" with status %d\n", direntry->d_name,
1598
WEXITSTATUS(status));
1599
free(fullname);
1600
continue;
1601
}
1602
} else if(WIFSIGNALED(status)){
1603
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1604
" signal %d\n", direntry->d_name,
1605
WTERMSIG(status));
1606
free(fullname);
1607
continue;
1608
} else {
1609
fprintf_plus(stderr, "Warning: network hook \"%s\""
1610
" crashed\n", direntry->d_name);
1611
free(fullname);
1612
continue;
1613
}
1614
}
1615
free(fullname);
1616
if(debug){
1617
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1618
direntry->d_name);
1619
}
1620
}
1621
close(devnull);
1622
}
1623
return true;
1624
}
1625
1626
error_t bring_up_interface(const char *const interface,
1627
const float delay){
1628
int sd = -1;
1629
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1632
struct ifreq network;
1633
unsigned int if_index = if_nametoindex(interface);
1634
if(if_index == 0){
1635
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1636
errno = old_errno;
1637
return ENXIO;
1638
}
1639
1640
if(quit_now){
1641
errno = old_errno;
1642
return EINTR;
1643
}
1644
1645
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
1647
ret_errno = errno;
1648
fprintf_plus(stderr, "Failed to get flags for interface "
1649
"\"%s\"\n", interface);
1650
return ret_errno;
1651
}
1652
network.ifr_flags |= IFF_UP;
1653
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1655
if(sd < 0){
1656
ret_errno = errno;
1657
perror_plus("socket");
1658
errno = old_errno;
1659
return ret_errno;
1660
}
1661
1662
if(quit_now){
1663
close(sd);
1664
errno = old_errno;
1665
return EINTR;
1666
}
1667
1668
if(debug){
1669
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1670
interface);
1671
}
1672
1673
/* Raise priviliges */
1674
raise_privileges();
1675
1676
#ifdef __linux__
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
1684
}
1685
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1687
ret_errno = errno;
1688
#ifdef __linux__
1689
if(restore_loglevel){
1690
ret_linux = klogctl(7, NULL, 0);
1691
if(ret_linux == -1){
1692
perror_plus("klogctl");
1693
}
1694
}
1695
#endif /* __linux__ */
1696
1697
/* Lower privileges */
1698
lower_privileges();
1699
1700
/* Close the socket */
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
1706
if(ret_setflags == -1){
1707
errno = ret_errno;
1708
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
} else if(debug){
1713
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1714
interface);
1715
}
1716
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
1720
if(interface_is_running(interface)){
1721
break;
1722
}
1723
struct timespec sleeptime = { .tv_nsec = 250000000 };
1724
ret = nanosleep(&sleeptime, NULL);
1725
if(ret == -1 and errno != EINTR){
1726
perror_plus("nanosleep");
1727
}
1728
}
1729
1730
errno = old_errno;
1731
return 0;
1732
}
1733
1734
error_t take_down_interface(const char *const interface){
1735
error_t old_errno = errno;
1736
struct ifreq network;
1737
unsigned int if_index = if_nametoindex(interface);
1738
if(if_index == 0){
1739
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1740
errno = old_errno;
1741
return ENXIO;
1742
}
1743
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
1745
if(not get_flags(interface, &network) and debug){
1746
ret_errno = errno;
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
return ret_errno;
1750
}
1751
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1752
1753
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1754
if(sd < 0){
1755
ret_errno = errno;
1756
perror_plus("socket");
1757
errno = old_errno;
1758
return ret_errno;
1759
}
1760
1761
if(debug){
1762
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1763
interface);
1764
}
1765
1766
/* Raise priviliges */
1767
raise_privileges();
1768
1769
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1770
ret_errno = errno;
1771
1772
/* Lower privileges */
1773
lower_privileges();
1774
1775
/* Close the socket */
1776
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ret_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1784
errno = old_errno;
1785
return ret_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1789
interface);
1790
}
1791
1792
errno = old_errno;
1793
return 0;
1794
}
1795
1413
1796
int main(int argc, char *argv[]){
1797
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1800
.interfaces = NULL, .interfaces_size = 0 };
1414
1801
AvahiSServiceBrowser *sb = NULL;
1415
int error;
1802
error_t ret_errno;
1416
1803
int ret;
1417
1804
intmax_t tmpmax;
1418
1805
char *tmp;
1419
1806
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
1421
struct ifreq network;
1422
int sd = -1;
1423
bool take_down_interface = false;
1424
uid_t uid;
1425
gid_t gid;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
1426
1809
char tempdir[] = "/tmp/mandosXXXXXX";
1427
1810
bool tempdir_created = false;
1428
1811
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
1812
const char *seckey = PATHDIR "/" SECKEY;
1430
1813
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1431
1815
1432
1816
bool gnutls_initialized = false;
1433
1817
bool gpgme_initialized = false;
1495
1879
.group = 2 },
1496
1880
{ .name = "retry", .key = 132,
1497
1881
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1882
.doc = "Retry interval used when denied by the Mandos server",
1499
1883
.group = 2 },
1500
1884
{ .name = "network-hook-dir", .key = 133,
1501
1885
.arg = "DIR",
1524
1908
connect_to = arg;
1525
1909
break;
1526
1910
case 'i': /* --interface */
1527
interface = arg;
1911
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1912
arg, (int)',');
1913
if(ret_errno != 0){
1914
argp_error(state, "%s", strerror(ret_errno));
1915
}
1528
1916
break;
1529
1917
case 's': /* --seckey */
1530
1918
seckey = arg;
1573
1961
argp_state_help(state, state->out_stream,
1574
1962
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
1963
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
1964
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1578
1965
exit(argp_err_exit_status);
1579
1966
break;
1580
1967
default:
1607
1994
{
1608
1995
/* Work around Debian bug #633582:
1609
1996
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1997
1612
1998
/* Re-raise priviliges */
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
1675
} else {
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("DEVICE", interface, 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
ret = setenv("MODE", "start", 1);
1707
if(ret == -1){
1708
perror_plus("setenv");
1709
exit(1);
1710
}
1711
char *delaystring;
1712
ret = asprintf(&delaystring, "%f", delay);
1713
if(ret == -1){
1714
perror_plus("asprintf");
1715
exit(1);
1716
}
1717
ret = setenv("DELAY", delaystring, 1);
1718
if(ret == -1){
1719
free(delaystring);
1720
perror_plus("setenv");
1721
exit(1);
1722
}
1723
free(delaystring);
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1726
} else {
1727
int status;
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1730
free(fullname);
1731
continue;
1732
}
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1739
free(fullname);
1740
continue;
1741
}
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1746
WTERMSIG(status));
1747
free(fullname);
1748
continue;
1749
} else {
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
1752
direntry->d_name);
1753
free(fullname);
1754
continue;
1755
}
1756
}
1757
free(fullname);
1758
if(quit_now){
1759
goto end;
1760
}
1761
}
1762
close(devnull);
1999
if(raise_privileges() == 0){
2000
struct stat st;
2001
2002
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2003
int seckey_fd = open(seckey, O_RDONLY);
2004
if(seckey_fd == -1){
2005
perror_plus("open");
2006
} else {
2007
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2008
if(ret == -1){
2009
perror_plus("fstat");
2010
} else {
2011
if(S_ISREG(st.st_mode)
2012
and st.st_uid == 0 and st.st_gid == 0){
2013
ret = fchown(seckey_fd, uid, gid);
2014
if(ret == -1){
2015
perror_plus("fchown");
2016
}
2017
}
2018
}
2019
TEMP_FAILURE_RETRY(close(seckey_fd));
2020
}
2021
}
2022
2023
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2024
int pubkey_fd = open(pubkey, O_RDONLY);
2025
if(pubkey_fd == -1){
2026
perror_plus("open");
2027
} else {
2028
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2029
if(ret == -1){
2030
perror_plus("fstat");
2031
} else {
2032
if(S_ISREG(st.st_mode)
2033
and st.st_uid == 0 and st.st_gid == 0){
2034
ret = fchown(pubkey_fd, uid, gid);
2035
if(ret == -1){
2036
perror_plus("fchown");
2037
}
2038
}
2039
}
2040
TEMP_FAILURE_RETRY(close(pubkey_fd));
2041
}
2042
}
2043
2044
/* Lower privileges */
2045
lower_privileges();
2046
}
2047
}
2048
2049
/* Remove invalid interface names (except "none") */
2050
{
2051
char *interface = NULL;
2052
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2053
interface))){
2054
if(strcmp(interface, "none") != 0
2055
and if_nametoindex(interface) == 0){
2056
if(interface[0] != '\0'){
2057
fprintf_plus(stderr, "Not using nonexisting interface"
2058
" \"%s\"\n", interface);
2059
}
2060
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2061
interface = NULL;
2062
}
2063
}
2064
}
2065
2066
/* Run network hooks */
2067
{
2068
if(mc.interfaces != NULL){
2069
interfaces_hooks = malloc(mc.interfaces_size);
2070
if(interfaces_hooks == NULL){
2071
perror_plus("malloc");
2072
goto end;
2073
}
2074
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
1763
2080
}
1764
2081
}
1765
2082
1767
2084
avahi_set_log_function(empty_log);
1768
2085
}
1769
2086
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1787
}
1788
if(interface == NULL){
1789
perror_plus("malloc");
1790
free(direntries);
1791
exitcode = EXIT_FAILURE;
1792
goto end;
1793
}
1794
free(direntries);
1795
} else {
1796
free(direntries);
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
}
1803
1804
2087
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1805
2088
from the signal handler */
1806
2089
/* Initialize the pseudo-RNG for Avahi */
1807
2090
srand((unsigned int) time(NULL));
1808
mc.simple_poll = avahi_simple_poll_new();
1809
if(mc.simple_poll == NULL){
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
1812
2095
exitcode = EX_UNAVAILABLE;
1813
2096
goto end;
1814
2097
}
1876
2159
}
1877
2160
}
1878
2161
1879
/* If the interface is down, bring it up */
1880
if(strcmp(interface, "none") != 0){
1881
if_index = (AvahiIfIndex) if_nametoindex(interface);
1882
if(if_index == 0){
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1885
exitcode = EX_UNAVAILABLE;
1886
goto end;
1887
}
1888
1889
if(quit_now){
1890
goto end;
1891
}
1892
1893
/* Re-raise priviliges */
1894
errno = 0;
1895
ret = seteuid(0);
1896
if(ret == -1){
1897
perror_plus("seteuid");
1898
}
1899
1900
#ifdef __linux__
1901
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1902
messages about the network interface to mess up the prompt */
1903
ret = klogctl(8, NULL, 5);
1904
bool restore_loglevel = true;
1905
if(ret == -1){
1906
restore_loglevel = false;
1907
perror_plus("klogctl");
1908
}
1909
#endif /* __linux__ */
1910
1911
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1912
if(sd < 0){
1913
perror_plus("socket");
1914
exitcode = EX_OSERR;
1915
#ifdef __linux__
1916
if(restore_loglevel){
1917
ret = klogctl(7, NULL, 0);
1918
if(ret == -1){
1919
perror_plus("klogctl");
1920
}
1921
}
1922
#endif /* __linux__ */
1923
/* Lower privileges */
1924
errno = 0;
1925
ret = seteuid(uid);
1926
if(ret == -1){
1927
perror_plus("seteuid");
1928
}
1929
goto end;
1930
}
1931
strcpy(network.ifr_name, interface);
1932
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1933
if(ret == -1){
1934
perror_plus("ioctl SIOCGIFFLAGS");
1935
#ifdef __linux__
1936
if(restore_loglevel){
1937
ret = klogctl(7, NULL, 0);
1938
if(ret == -1){
1939
perror_plus("klogctl");
1940
}
1941
}
1942
#endif /* __linux__ */
1943
exitcode = EX_OSERR;
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
if((network.ifr_flags & IFF_UP) == 0){
1953
network.ifr_flags |= IFF_UP;
1954
take_down_interface = true;
1955
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1956
if(ret == -1){
1957
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1959
exitcode = EX_OSERR;
1960
#ifdef __linux__
1961
if(restore_loglevel){
1962
ret = klogctl(7, NULL, 0);
1963
if(ret == -1){
1964
perror_plus("klogctl");
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("argz_add");
2176
continue;
2177
}
2178
if(debug){
2179
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2180
direntries[i]->d_name);
2181
}
2182
}
2183
free(direntries);
2184
} else {
2185
free(direntries);
2186
fprintf_plus(stderr, "Could not find a network interface\n");
2187
exitcode = EXIT_FAILURE;
2188
goto end;
2189
}
2190
}
2191
2192
/* Bring up interfaces which are down, and remove any "none"s */
2193
{
2194
char *interface = NULL;
2195
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2196
interface))){
2197
/* If interface name is "none", stop bringing up interfaces.
2198
Also remove all instances of "none" from the list */
2199
if(strcmp(interface, "none") == 0){
2200
argz_delete(&mc.interfaces, &mc.interfaces_size,
2201
interface);
2202
interface = NULL;
2203
while((interface = argz_next(mc.interfaces,
2204
mc.interfaces_size, interface))){
2205
if(strcmp(interface, "none") == 0){
2206
argz_delete(&mc.interfaces, &mc.interfaces_size,
2207
interface);
2208
interface = NULL;
1965
2209
}
1966
2210
}
1967
#endif /* __linux__ */
1968
/* Lower privileges */
1969
errno = 0;
1970
ret = seteuid(uid);
1971
if(ret == -1){
1972
perror_plus("seteuid");
1973
}
1974
goto end;
1975
}
1976
}
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1979
for(int i=0; i < delay * 4; i++){
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1981
if(ret == -1){
1982
perror_plus("ioctl SIOCGIFFLAGS");
1983
} else if(network.ifr_flags & IFF_RUNNING){
1984
2211
break;
1985
2212
}
1986
struct timespec sleeptime = { .tv_nsec = 250000000 };
1987
ret = nanosleep(&sleeptime, NULL);
1988
if(ret == -1 and errno != EINTR){
1989
perror_plus("nanosleep");
1990
}
1991
}
1992
if(not take_down_interface){
1993
/* We won't need the socket anymore */
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
}
1999
#ifdef __linux__
2000
if(restore_loglevel){
2001
/* Restores kernel loglevel to default */
2002
ret = klogctl(7, NULL, 0);
2003
if(ret == -1){
2004
perror_plus("klogctl");
2005
}
2006
}
2007
#endif /* __linux__ */
2008
/* Lower privileges */
2009
errno = 0;
2010
if(take_down_interface){
2011
/* Lower privileges */
2012
ret = seteuid(uid);
2013
if(ret == -1){
2014
perror_plus("seteuid");
2015
}
2016
} else {
2017
/* Lower privileges permanently */
2018
ret = setuid(uid);
2019
if(ret == -1){
2020
perror_plus("setuid");
2021
}
2022
}
2213
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2215
if(not interface_was_up){
2216
if(ret != 0){
2217
errno = ret;
2218
perror_plus("Failed to bring up interface");
2219
} else {
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2222
interface);
2223
if(ret_errno != 0){
2224
errno = ret_errno;
2225
perror_plus("argz_add");
2226
}
2227
}
2228
}
2229
}
2230
if(debug and (interfaces_to_take_down == NULL)){
2231
fprintf_plus(stderr, "No interfaces were brought up\n");
2232
}
2233
}
2234
2235
/* If we only got one interface, explicitly use only that one */
2236
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2237
if(debug){
2238
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2239
mc.interfaces);
2240
}
2241
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2023
2242
}
2024
2243
2025
2244
if(quit_now){
2026
2245
goto end;
2027
2246
}
2028
2247
2029
ret = init_gnutls_global(pubkey, seckey);
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
2249
if(ret == -1){
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2250
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2251
exitcode = EX_UNAVAILABLE;
2034
2252
goto end;
2035
2253
} else {
2050
2268
goto end;
2051
2269
}
2052
2270
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf(stderr, "Mandos plugin mandos-client: "
2055
"init_gpgme failed\n");
2271
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2272
fprintf_plus(stderr, "init_gpgme failed\n");
2056
2273
exitcode = EX_UNAVAILABLE;
2057
2274
goto end;
2058
2275
} else {
2067
2284
/* Connect directly, do not use Zeroconf */
2068
2285
/* (Mainly meant for debugging) */
2069
2286
char *address = strrchr(connect_to, ':');
2287
2070
2288
if(address == NULL){
2071
fprintf(stderr, "Mandos plugin mandos-client: "
2072
"No colon in address\n");
2289
fprintf_plus(stderr, "No colon in address\n");
2073
2290
exitcode = EX_USAGE;
2074
2291
goto end;
2075
2292
}
2078
2295
goto end;
2079
2296
}
2080
2297
2081
uint16_t port;
2298
in_port_t port;
2082
2299
errno = 0;
2083
2300
tmpmax = strtoimax(address+1, &tmp, 10);
2084
2301
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2085
or tmpmax != (uint16_t)tmpmax){
2086
fprintf(stderr, "Mandos plugin mandos-client: "
2087
"Bad port number\n");
2302
or tmpmax != (in_port_t)tmpmax){
2303
fprintf_plus(stderr, "Bad port number\n");
2088
2304
exitcode = EX_USAGE;
2089
2305
goto end;
2090
2306
}
2091
2307
2092
2308
if(quit_now){
2093
2309
goto end;
2094
2310
}
2095
2311
2096
port = (uint16_t)tmpmax;
2312
port = (in_port_t)tmpmax;
2097
2313
*address = '\0';
2098
2314
/* Colon in address indicates IPv6 */
2099
2315
int af;
2115
2331
}
2116
2332
2117
2333
while(not quit_now){
2118
ret = start_mandos_communication(address, port, if_index, af);
2334
ret = start_mandos_communication(address, port, if_index, af,
2335
&mc);
2119
2336
if(quit_now or ret == 0){
2120
2337
break;
2121
2338
}
2122
2339
if(debug){
2123
fprintf(stderr, "Mandos plugin mandos-client: "
2124
"Retrying in %d seconds\n", (int)retry_interval);
2340
fprintf_plus(stderr, "Retrying in %d seconds\n",
2341
(int)retry_interval);
2125
2342
}
2126
sleep((int)retry_interval);
2343
sleep((unsigned int)retry_interval);
2127
2344
}
2128
2345
2129
2346
if (not quit_now){
2147
2364
config.publish_domain = 0;
2148
2365
2149
2366
/* Allocate a new server */
2150
mc.server = avahi_server_new(avahi_simple_poll_get
2151
(mc.simple_poll), &config, NULL,
2152
NULL, &error);
2367
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
2153
2369
2154
2370
/* Free the Avahi configuration data */
2155
2371
avahi_server_config_free(&config);
2157
2373
2158
2374
/* Check if creating the Avahi server object succeeded */
2159
2375
if(mc.server == NULL){
2160
fprintf(stderr, "Mandos plugin mandos-client: "
2161
"Failed to create Avahi server: %s\n",
2162
avahi_strerror(error));
2376
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2377
avahi_strerror(ret_errno));
2163
2378
exitcode = EX_UNAVAILABLE;
2164
2379
goto end;
2165
2380
}
2171
2386
/* Create the Avahi service browser */
2172
2387
sb = avahi_s_service_browser_new(mc.server, if_index,
2173
2388
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2174
NULL, 0, browse_callback, NULL);
2389
NULL, 0, browse_callback,
2390
(void *)&mc);
2175
2391
if(sb == NULL){
2176
fprintf(stderr, "Mandos plugin mandos-client: "
2177
"Failed to create service browser: %s\n",
2178
avahi_strerror(avahi_server_errno(mc.server)));
2392
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2393
avahi_strerror(avahi_server_errno(mc.server)));
2179
2394
exitcode = EX_UNAVAILABLE;
2180
2395
goto end;
2181
2396
}
2187
2402
/* Run the main loop */
2188
2403
2189
2404
if(debug){
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2405
fprintf_plus(stderr, "Starting Avahi loop search\n");
2192
2406
}
2193
2407
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
2196
2410
if(debug){
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2411
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2412
(ret == 0) ? "successfully" : "with error");
2200
2413
}
2201
2414
2202
2415
end:
2203
2416
2204
2417
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
2418
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2207
2419
}
2208
2420
2209
2421
/* Cleanup things */
2422
free(mc.interfaces);
2423
2210
2424
if(sb != NULL)
2211
2425
avahi_s_service_browser_free(sb);
2212
2426
2213
2427
if(mc.server != NULL)
2214
2428
avahi_server_free(mc.server);
2215
2429
2216
if(mc.simple_poll != NULL)
2217
avahi_simple_poll_free(mc.simple_poll);
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
2218
2432
2219
2433
if(gnutls_initialized){
2220
2434
gnutls_certificate_free_credentials(mc.cred);
2225
2439
if(gpgme_initialized){
2226
2440
gpgme_release(mc.ctx);
2227
2441
}
2228
2442
2229
2443
/* Cleans up the circular linked list of Mandos servers the client
2230
2444
has seen */
2231
2445
if(mc.current_server != NULL){
2237
2451
}
2238
2452
}
2239
2453
2240
/* XXX run network hooks "stop" here */
2241
2242
/* Take down the network interface */
2243
if(take_down_interface){
2244
/* Re-raise priviliges */
2245
errno = 0;
2246
ret = seteuid(0);
2247
if(ret == -1){
2248
perror_plus("seteuid");
2249
}
2250
if(geteuid() == 0){
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2257
if(ret == -1){
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2454
/* Re-raise priviliges */
2455
{
2456
raise_privileges();
2457
2458
/* Run network hooks */
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2461
2462
/* Take down the network interfaces which were brought up */
2463
{
2464
char *interface = NULL;
2465
while((interface=argz_next(interfaces_to_take_down,
2466
interfaces_to_take_down_size,
2467
interface))){
2468
ret_errno = take_down_interface(interface);
2469
if(ret_errno != 0){
2470
errno = ret_errno;
2471
perror_plus("Failed to take down interface");
2259
2472
}
2260
2473
}
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2262
if(ret == -1){
2263
perror_plus("close");
2264
}
2265
/* Lower privileges permanently */
2266
errno = 0;
2267
ret = setuid(uid);
2268
if(ret == -1){
2269
perror_plus("setuid");
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
2270
2477
}
2271
2478
}
2479
2480
lower_privileges_permanently();
2272
2481
}
2273
2482
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2485
2274
2486
/* Removes the GPGME temp directory and all files inside */
2275
2487
if(tempdir_created){
2276
2488
struct dirent **direntries = NULL;
2289
2501
}
2290
2502
ret = remove(fullname);
2291
2503
if(ret == -1){
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2504
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2505
strerror(errno));
2294
2506
}
2295
2507
free(fullname);
2296
2508
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0