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237.7.280
(compared to revision 237.15.5)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-08-10 14:13:02 UTC
- mto: (237.7.304 trunk)
- mto: This revision was merged to the branch mainline in revision 323.
- Revision ID: teddy@recompile.se-20140810141302-8q1xaaxlh8ho5joz
Emit D-Bus "org.freedesktop.DBus.Properties.PropertiesChanged" signal.
This deprecates the "se.recompile.Mandos.Client.PropertyChanged"
signal. The new signal also adds support for noticing changes to the
"se.recompile.Mandos.Client.Secret" write-only property.
* mandos (dbus_annotations): Fix usage example in doc string.
(DBusObjectWithProperties.PropertiesChanged): New; from D-Bus
standard.
(ClientDBus._interface): Set early instead of later.
(ClientDBus.notifychangeproperty): Take new "invalidate_only"
parameter, and pass in _interface
as a default keyword argument.
(ClientDBus.notifychangeproperty/setter): Also emit
PropertiesChanged signal;
emit new value or
invalidation depending on
"invalidate_only".
(ClientDBus.secret): Apply notifychangeproperty with
"invalidate_only=True".
(ClientDBus._foo): Removed defunct interface annotation.
(ClientDBus.PropertyChanged): Add annotation; this method is now
deprecated.
(main/MandosDBusService.GetAllClientsWithProperties): Use dictionary
comprehension.
* DBUS-API (Mandos Client Interface/Signals/PropertyChanged): Removed.
* mandos-monitor: Use standard "PropertiesChanged" signal instead of
old signal "PropertyChanged".
(MandosClientPropertyCache.__init__): Connect to signal
PropertiesChanged instead of
PropertyChanged.
(MandosClientPropertyCache._property_changed): Removed.
(MandosClientPropertyCache.property_changed): Renamed to
"properties_changed"
and adapted to new
call signature.
(MandosClientWidget.properties_changed): - '' -
This deprecates the "se.recompile.Mandos.Client.PropertyChanged"
signal. The new signal also adds support for noticing changes to the
"se.recompile.Mandos.Client.Secret" write-only property.
* mandos (dbus_annotations): Fix usage example in doc string.
(DBusObjectWithProperties.PropertiesChanged): New; from D-Bus
standard.
(ClientDBus._interface): Set early instead of later.
(ClientDBus.notifychangeproperty): Take new "invalidate_only"
parameter, and pass in _interface
as a default keyword argument.
(ClientDBus.notifychangeproperty/setter): Also emit
PropertiesChanged signal;
emit new value or
invalidation depending on
"invalidate_only".
(ClientDBus.secret): Apply notifychangeproperty with
"invalidate_only=True".
(ClientDBus._foo): Removed defunct interface annotation.
(ClientDBus.PropertyChanged): Add annotation; this method is now
deprecated.
(main/MandosDBusService.GetAllClientsWithProperties): Use dictionary
comprehension.
* DBUS-API (Mandos Client Interface/Signals/PropertyChanged): Removed.
* mandos-monitor: Use standard "PropertiesChanged" signal instead of
old signal "PropertyChanged".
(MandosClientPropertyCache.__init__): Connect to signal
PropertiesChanged instead of
PropertyChanged.
(MandosClientPropertyCache._property_changed): Removed.
(MandosClientPropertyCache.property_changed): Renamed to
"properties_changed"
and adapted to new
call signature.
(MandosClientWidget.properties_changed): - '' -
- 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
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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
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strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
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
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
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#include <errno.h> /* perror(), errno,
66
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program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
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#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
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#include <iso646.h> /* not, or, and */
79
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#include <argp.h> /* struct argp_option, error_t, struct
80
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argp_state, struct argp,
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() */
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() */
90
98
91
99
#ifdef __linux__
92
100
#include <sys/klog.h> /* klogctl() */
134
142
static const char sys_class_net[] = "/sys/class/net";
135
143
char *connect_to = NULL;
136
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
137
148
138
149
/* Doubly linked list that need to be circularly linked when used */
139
150
typedef struct server{
140
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const char *ip;
141
uint16_t port;
152
in_port_t port;
142
153
AvahiIfIndex if_index;
143
154
int af;
144
155
struct timespec last_seen;
148
159
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160
/* Used for passing in values through the Avahi callback functions */
150
161
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
162
AvahiServer *server;
153
163
gnutls_certificate_credentials_t cred;
154
164
unsigned int dh_bits;
156
166
const char *priority;
157
167
gpgme_ctx_t ctx;
158
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
159
171
} mandos_context;
160
172
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/* 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 };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
166
175
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sig_atomic_t quit_now = 0;
168
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int signal_received = 0;
169
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170
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/* Function to use when printing errors */
171
180
void perror_plus(const char *print_text){
181
int e = errno;
172
182
fprintf(stderr, "Mandos plugin %s: ",
173
183
program_invocation_short_name);
184
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), nonnull))
177
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int fprintf_plus(FILE *stream, const char *format, ...){
178
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va_list ap;
179
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va_start (ap, format);
180
192
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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
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));
183
196
}
184
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/*
187
200
* bytes. "buffer_capacity" is how much is currently allocated,
188
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* "buffer_length" is how much is already used.
189
202
*/
203
__attribute__((nonnull, warn_unused_result))
190
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size_t incbuffer(char **buffer, size_t buffer_length,
191
205
size_t buffer_capacity){
192
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
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;
195
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return 0;
196
214
}
215
*buffer = new_buf;
197
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buffer_capacity += BUFFER_SIZE;
198
217
}
199
218
return buffer_capacity;
200
219
}
201
220
202
221
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
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){
205
225
int ret;
206
226
server *new_server = malloc(sizeof(server));
207
227
if(new_server == NULL){
208
228
perror_plus("malloc");
209
return -1;
229
return false;
210
230
}
211
231
*new_server = (server){ .ip = strdup(ip),
212
232
.port = port,
214
234
.af = af };
215
235
if(new_server->ip == NULL){
216
236
perror_plus("strdup");
217
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;
218
253
}
219
254
/* Special case of first server */
220
if (mc.current_server == NULL){
255
if(*current_server == NULL){
221
256
new_server->next = new_server;
222
257
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
258
*current_server = new_server;
225
259
} else {
226
new_server->next = mc.current_server;
227
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;
228
263
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
237
267
}
238
268
239
269
/*
240
270
* Initialize GPGME.
241
271
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
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){
244
277
gpgme_error_t rc;
245
278
gpgme_engine_info_t engine_info;
246
279
247
248
280
/*
249
281
* Helper function to insert pub and seckey to the engine keyring.
250
282
*/
251
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
252
284
int ret;
253
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int fd;
254
286
gpgme_data_t pgp_data;
261
293
262
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
295
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
266
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));
267
298
return false;
268
299
}
269
300
270
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
271
302
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
275
305
return false;
276
306
}
277
307
284
314
}
285
315
286
316
if(debug){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
289
318
}
290
319
291
320
/* Init GPGME */
292
321
gpgme_check_version(NULL);
293
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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
323
if(rc != GPG_ERR_NO_ERROR){
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
297
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));
298
326
return false;
299
327
}
300
328
301
329
/* Set GPGME home directory for the OpenPGP engine only */
302
330
rc = gpgme_get_engine_info(&engine_info);
303
331
if(rc != GPG_ERR_NO_ERROR){
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
306
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));
307
334
return false;
308
335
}
309
336
while(engine_info != NULL){
315
342
engine_info = engine_info->next;
316
343
}
317
344
if(engine_info == NULL){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"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);
320
347
return false;
321
348
}
322
349
323
350
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
325
352
if(rc != GPG_ERR_NO_ERROR){
326
fprintf(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
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));
329
356
return false;
330
357
}
331
358
340
367
* Decrypt OpenPGP data.
341
368
* Returns -1 on error
342
369
*/
370
__attribute__((nonnull, warn_unused_result))
343
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
372
size_t crypto_size,
345
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
346
375
gpgme_data_t dh_crypto, dh_plain;
347
376
gpgme_error_t rc;
348
377
ssize_t ret;
350
379
ssize_t plaintext_length = 0;
351
380
352
381
if(debug){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
355
383
}
356
384
357
385
/* Create new GPGME data buffer from memory cryptotext */
358
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
359
387
0);
360
388
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
363
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));
364
391
return -1;
365
392
}
366
393
367
394
/* Create new empty GPGME data buffer for the plaintext */
368
395
rc = gpgme_data_new(&dh_plain);
369
396
if(rc != GPG_ERR_NO_ERROR){
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
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));
373
400
gpgme_data_release(dh_crypto);
374
401
return -1;
375
402
}
376
403
377
404
/* Decrypt data from the cryptotext data buffer to the plaintext
378
405
data buffer */
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
380
407
if(rc != GPG_ERR_NO_ERROR){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
384
410
plaintext_length = -1;
385
411
if(debug){
386
412
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
388
414
if(result == NULL){
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
391
416
} else {
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
397
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);
398
421
if(result->file_name != NULL){
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
401
423
}
402
424
gpgme_recipient_t recipient;
403
425
recipient = result->recipients;
404
426
while(recipient != NULL){
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
412
recipient->status == GPG_ERR_NO_SECKEY
413
? "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");
414
434
recipient = recipient->next;
415
435
}
416
436
}
419
439
}
420
440
421
441
if(debug){
422
fprintf(stderr, "Mandos plugin mandos-client: "
423
"Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
424
443
}
425
444
426
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
457
476
}
458
477
459
478
if(debug){
460
fprintf(stderr, "Mandos plugin mandos-client: "
461
"Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
462
480
for(ssize_t i = 0; i < plaintext_length; i++){
463
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
482
}
475
493
return plaintext_length;
476
494
}
477
495
478
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value); /* Spurious warning from
480
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
481
499
if(ret == NULL)
482
500
ret = "(unknown)";
483
501
return ret;
484
502
}
485
503
486
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
487
506
static void debuggnutls(__attribute__((unused)) int level,
488
507
const char* string){
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
490
509
}
491
510
511
__attribute__((nonnull, warn_unused_result))
492
512
static int init_gnutls_global(const char *pubkeyfilename,
493
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
494
515
int ret;
495
516
496
517
if(debug){
497
fprintf(stderr, "Mandos plugin mandos-client: "
498
"Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
499
519
}
500
520
501
521
ret = gnutls_global_init();
502
522
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Mandos plugin mandos-client: "
504
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
505
525
return -1;
506
526
}
507
527
514
534
}
515
535
516
536
/* OpenPGP credentials */
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
518
538
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
521
541
gnutls_global_deinit();
522
542
return -1;
523
543
}
524
544
525
545
if(debug){
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
528
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
529
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
530
550
}
531
551
532
552
ret = gnutls_certificate_set_openpgp_key_file
533
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
534
554
GNUTLS_OPENPGP_FMT_BASE64);
535
555
if(ret != GNUTLS_E_SUCCESS){
536
fprintf(stderr,
537
"Mandos plugin mandos-client: "
538
"Error[%d] while reading the OpenPGP key pair ('%s',"
539
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
542
561
goto globalfail;
543
562
}
544
563
545
564
/* GnuTLS server initialization */
546
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
547
566
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
550
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
551
570
goto globalfail;
552
571
}
553
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
554
573
if(ret != GNUTLS_E_SUCCESS){
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
557
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
558
576
goto globalfail;
559
577
}
560
578
561
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
562
580
563
581
return 0;
564
582
565
583
globalfail:
566
584
567
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
568
586
gnutls_global_deinit();
569
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
570
588
return -1;
571
589
}
572
590
573
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
574
594
int ret;
575
595
/* GnuTLS session creation */
576
596
do {
580
600
}
581
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
582
602
if(ret != GNUTLS_E_SUCCESS){
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
585
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
586
606
}
587
607
588
608
{
589
609
const char *err;
590
610
do {
591
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
592
612
if(quit_now){
593
613
gnutls_deinit(*session);
594
614
return -1;
595
615
}
596
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
597
617
if(ret != GNUTLS_E_SUCCESS){
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
602
621
gnutls_deinit(*session);
603
622
return -1;
604
623
}
606
625
607
626
do {
608
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
609
mc.cred);
628
mc->cred);
610
629
if(quit_now){
611
630
gnutls_deinit(*session);
612
631
return -1;
613
632
}
614
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
615
634
if(ret != GNUTLS_E_SUCCESS){
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
618
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
619
637
gnutls_deinit(*session);
620
638
return -1;
621
639
}
623
641
/* ignore client certificate if any. */
624
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
625
643
626
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
627
645
628
646
return 0;
629
647
}
633
651
__attribute__((unused)) const char *txt){}
634
652
635
653
/* Called when a Mandos server is found */
636
static int start_mandos_communication(const char *ip, uint16_t port,
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
637
656
AvahiIfIndex if_index,
638
int af){
657
int af, mandos_context *mc){
639
658
int ret, tcp_sd = -1;
640
659
ssize_t sret;
641
union {
642
struct sockaddr_in in;
643
struct sockaddr_in6 in6;
644
} to;
660
struct sockaddr_storage to;
645
661
char *buffer = NULL;
646
662
char *decrypted_buffer = NULL;
647
663
size_t buffer_length = 0;
666
682
pf = PF_INET;
667
683
break;
668
684
default:
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
671
686
errno = EINVAL;
672
687
return -1;
673
688
}
674
689
675
ret = init_gnutls_session(&session);
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
676
723
if(ret != 0){
677
724
return -1;
678
725
}
679
726
680
727
if(debug){
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
683
"\n", ip, port);
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
684
730
}
685
731
686
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
698
744
699
745
memset(&to, 0, sizeof(to));
700
746
if(af == AF_INET6){
701
to.in6.sin6_family = (sa_family_t)af;
702
ret = inet_pton(af, ip, &to.in6.sin6_addr);
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
703
749
} else { /* IPv4 */
704
to.in.sin_family = (sa_family_t)af;
705
ret = inet_pton(af, ip, &to.in.sin_addr);
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
706
752
}
707
753
if(ret < 0 ){
708
754
int e = errno;
712
758
}
713
759
if(ret == 0){
714
760
int e = errno;
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
717
762
errno = e;
718
763
goto mandos_end;
719
764
}
720
765
if(af == AF_INET6){
721
to.in6.sin6_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
724
725
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
726
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
727
-Wunreachable-code*/
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
728
769
if(if_index == AVAHI_IF_UNSPEC){
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
731
" without a network interface\n");
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
732
772
errno = EINVAL;
733
773
goto mandos_end;
734
774
}
735
775
/* Set the network interface number as scope */
736
to.in6.sin6_scope_id = (uint32_t)if_index;
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
737
777
}
738
778
} else {
739
to.in.sin_port = htons(port); /* Spurious warnings from
740
-Wconversion and
741
-Wunreachable-code */
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
742
780
}
743
781
744
782
if(quit_now){
752
790
if(if_indextoname((unsigned int)if_index, interface) == NULL){
753
791
perror_plus("if_indextoname");
754
792
} else {
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
757
ip, interface, port);
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
758
795
}
759
796
} else {
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
762
799
}
763
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
764
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
765
const char *pcret;
766
802
if(af == AF_INET6){
767
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
768
sizeof(addrstr));
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
769
807
} else {
770
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
771
sizeof(addrstr));
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
772
812
}
773
if(pcret == NULL){
774
perror_plus("inet_ntop");
775
} else {
776
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
779
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
780
819
}
781
820
}
782
821
786
825
}
787
826
788
827
if(af == AF_INET6){
789
ret = connect(tcp_sd, &to.in6, sizeof(to));
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
790
830
} else {
791
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
792
833
}
793
834
if(ret < 0){
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
795
836
int e = errno;
796
837
perror_plus("connect");
797
838
errno = e;
835
876
}
836
877
837
878
if(debug){
838
fprintf(stderr, "Mandos plugin mandos-client: "
839
"Establishing TLS session with %s\n", ip);
879
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
840
880
}
841
881
842
882
if(quit_now){
844
884
goto mandos_end;
845
885
}
846
886
847
/* Spurious warning from -Wint-to-pointer-cast */
848
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
849
892
850
893
if(quit_now){
851
894
errno = EINTR;
862
905
863
906
if(ret != GNUTLS_E_SUCCESS){
864
907
if(debug){
865
fprintf(stderr, "Mandos plugin mandos-client: "
866
"*** GnuTLS Handshake failed ***\n");
908
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
867
909
gnutls_perror(ret);
868
910
}
869
911
errno = EPROTO;
873
915
/* Read OpenPGP packet that contains the wanted password */
874
916
875
917
if(debug){
876
fprintf(stderr, "Mandos plugin mandos-client: "
877
"Retrieving OpenPGP encrypted password from %s\n", ip);
918
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
919
" %s\n", ip);
878
920
}
879
921
880
922
while(true){
918
960
}
919
961
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
920
962
if(ret < 0){
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"*** GnuTLS Re-handshake failed ***\n");
963
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
964
"***\n");
923
965
gnutls_perror(ret);
924
966
errno = EPROTO;
925
967
goto mandos_end;
926
968
}
927
969
break;
928
970
default:
929
fprintf(stderr, "Mandos plugin mandos-client: "
930
"Unknown error while reading data from"
931
" encrypted session with Mandos server\n");
971
fprintf_plus(stderr, "Unknown error while reading data from"
972
" encrypted session with Mandos server\n");
932
973
gnutls_bye(session, GNUTLS_SHUT_RDWR);
933
974
errno = EIO;
934
975
goto mandos_end;
939
980
}
940
981
941
982
if(debug){
942
fprintf(stderr, "Mandos plugin mandos-client: "
943
"Closing TLS session\n");
983
fprintf_plus(stderr, "Closing TLS session\n");
944
984
}
945
985
946
986
if(quit_now){
959
999
if(buffer_length > 0){
960
1000
ssize_t decrypted_buffer_size;
961
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
962
&decrypted_buffer);
1002
&decrypted_buffer, mc);
963
1003
if(decrypted_buffer_size >= 0){
964
1004
965
1005
written = 0;
975
1015
if(ret == 0 and ferror(stdout)){
976
1016
int e = errno;
977
1017
if(debug){
978
fprintf(stderr, "Mandos plugin mandos-client: "
979
"Error writing encrypted data: %s\n",
980
strerror(errno));
1018
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1019
strerror(errno));
981
1020
}
982
1021
errno = e;
983
1022
goto mandos_end;
1014
1053
return retval;
1015
1054
}
1016
1055
1056
__attribute__((nonnull))
1017
1057
static void resolve_callback(AvahiSServiceResolver *r,
1018
1058
AvahiIfIndex interface,
1019
1059
AvahiProtocol proto,
1027
1067
AVAHI_GCC_UNUSED AvahiStringList *txt,
1028
1068
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
1069
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(r);
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
1032
1074
1033
1075
/* Called whenever a service has been resolved successfully or
1034
1076
timed out */
1035
1077
1036
1078
if(quit_now){
1079
avahi_s_service_resolver_free(r);
1037
1080
return;
1038
1081
}
1039
1082
1040
1083
switch(event){
1041
1084
default:
1042
1085
case AVAHI_RESOLVER_FAILURE:
1043
fprintf(stderr, "Mandos plugin mandos-client: "
1044
"(Avahi Resolver) Failed to resolve service '%s'"
1045
" of type '%s' in domain '%s': %s\n", name, type, domain,
1046
avahi_strerror(avahi_server_errno(mc.server)));
1086
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1087
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1088
domain,
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
1047
1091
break;
1048
1092
1049
1093
case AVAHI_RESOLVER_FOUND:
1051
1095
char ip[AVAHI_ADDRESS_STR_MAX];
1052
1096
avahi_address_snprint(ip, sizeof(ip), address);
1053
1097
if(debug){
1054
fprintf(stderr, "Mandos plugin mandos-client: "
1055
"Mandos server \"%s\" found on %s (%s, %"
1056
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1057
ip, (intmax_t)interface, port);
1098
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1099
PRIdMAX ") on port %" PRIu16 "\n", name,
1100
host_name, ip, (intmax_t)interface, port);
1058
1101
}
1059
int ret = start_mandos_communication(ip, port, interface,
1060
avahi_proto_to_af(proto));
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
1061
1106
if(ret == 0){
1062
avahi_simple_poll_quit(mc.simple_poll);
1107
avahi_simple_poll_quit(simple_poll);
1063
1108
} else {
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
1109
if(not add_server(ip, (in_port_t)port, interface,
1110
avahi_proto_to_af(proto),
1111
&((mandos_context*)mc)->current_server)){
1112
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1113
" list\n", name);
1114
}
1066
1115
}
1067
1116
}
1068
1117
}
1078
1127
const char *domain,
1079
1128
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1080
1129
flags,
1081
AVAHI_GCC_UNUSED void* userdata){
1082
assert(b);
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
1083
1134
1084
1135
/* Called whenever a new services becomes available on the LAN or
1085
1136
is removed from the LAN */
1092
1143
default:
1093
1144
case AVAHI_BROWSER_FAILURE:
1094
1145
1095
fprintf(stderr, "Mandos plugin mandos-client: "
1096
"(Avahi browser) %s\n",
1097
avahi_strerror(avahi_server_errno(mc.server)));
1098
avahi_simple_poll_quit(mc.simple_poll);
1146
fprintf_plus(stderr, "(Avahi browser) %s\n",
1147
avahi_strerror(avahi_server_errno
1148
(((mandos_context*)mc)->server)));
1149
avahi_simple_poll_quit(simple_poll);
1099
1150
return;
1100
1151
1101
1152
case AVAHI_BROWSER_NEW:
1104
1155
the callback function is called the Avahi server will free the
1105
1156
resolver for us. */
1106
1157
1107
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1108
name, type, domain, protocol, 0,
1109
resolve_callback, NULL) == NULL)
1110
fprintf(stderr, "Mandos plugin mandos-client: "
1111
"Avahi: Failed to resolve service '%s': %s\n",
1112
name, avahi_strerror(avahi_server_errno(mc.server)));
1158
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1159
interface, protocol, name, type,
1160
domain, protocol, 0,
1161
resolve_callback, mc) == NULL)
1162
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1163
" %s\n", name,
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
1113
1166
break;
1114
1167
1115
1168
case AVAHI_BROWSER_REMOVE:
1118
1171
case AVAHI_BROWSER_ALL_FOR_NOW:
1119
1172
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1120
1173
if(debug){
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
1174
fprintf_plus(stderr, "No Mandos server found, still"
1175
" searching...\n");
1123
1176
}
1124
1177
break;
1125
1178
}
1134
1187
signal_received = sig;
1135
1188
int old_errno = errno;
1136
1189
/* set main loop to exit */
1137
if(mc.simple_poll != NULL){
1138
avahi_simple_poll_quit(mc.simple_poll);
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1139
1192
}
1140
1193
errno = old_errno;
1141
1194
}
1142
1195
1196
__attribute__((nonnull, warn_unused_result))
1143
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1144
1198
int ret;
1199
error_t ret_errno;
1145
1200
1146
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1147
1202
if(s < 0){
1203
ret_errno = errno;
1148
1204
perror_plus("socket");
1205
errno = ret_errno;
1149
1206
return false;
1150
1207
}
1151
1208
strcpy(ifr->ifr_name, ifname);
1152
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1153
1210
if(ret == -1){
1154
1211
if(debug){
1212
ret_errno = errno;
1155
1213
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1156
1215
}
1157
1216
return false;
1158
1217
}
1159
1218
return true;
1160
1219
}
1161
1220
1221
__attribute__((nonnull, warn_unused_result))
1162
1222
bool good_flags(const char *ifname, const struct ifreq *ifr){
1163
1223
1164
1224
/* Reject the loopback device */
1165
1225
if(ifr->ifr_flags & IFF_LOOPBACK){
1166
1226
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1227
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1228
ifname);
1169
1229
}
1170
1230
return false;
1171
1231
}
1172
1232
/* Accept point-to-point devices only if connect_to is specified */
1173
1233
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1174
1234
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1235
fprintf_plus(stderr, "Accepting point-to-point interface"
1236
" \"%s\"\n", ifname);
1177
1237
}
1178
1238
return true;
1179
1239
}
1180
1240
/* Otherwise, reject non-broadcast-capable devices */
1181
1241
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1182
1242
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1243
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1244
" \"%s\"\n", ifname);
1185
1245
}
1186
1246
return false;
1187
1247
}
1188
1248
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
1249
if(ifr->ifr_flags & IFF_NOARP){
1190
1250
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1251
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1252
ifname);
1193
1253
}
1194
1254
return false;
1195
1255
}
1196
1256
1197
1257
/* Accept this device */
1198
1258
if(debug){
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1259
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1201
1260
}
1202
1261
return true;
1203
1262
}
1207
1266
* corresponds to an acceptable network device.
1208
1267
* (This function is passed to scandir(3) as a filter function.)
1209
1268
*/
1269
__attribute__((nonnull, warn_unused_result))
1210
1270
int good_interface(const struct dirent *if_entry){
1211
1271
if(if_entry->d_name[0] == '.'){
1212
1272
return 0;
1215
1275
struct ifreq ifr;
1216
1276
if(not get_flags(if_entry->d_name, &ifr)){
1217
1277
if(debug){
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
if(not good_flags(if_entry->d_name, &ifr)){
1226
return 0;
1227
}
1228
return 1;
1229
}
1230
1231
/*
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1235
*/
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1238
return 0;
1239
}
1240
1241
struct ifreq ifr;
1242
if(not get_flags(if_entry->d_name, &ifr)){
1243
if(debug){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1246
if_entry->d_name);
1247
}
1248
return 0;
1249
}
1250
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1253
if(debug){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1256
if_entry->d_name);
1257
}
1258
return 0;
1259
}
1260
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1263
if(debug){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1266
if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", if_entry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
if(not good_flags(if_entry->d_name, &ifr)){
1285
return 0;
1286
}
1287
return 1;
1288
}
1289
1290
/*
1291
* This function determines if a network interface is up.
1292
*/
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1295
struct ifreq ifr;
1296
if(not get_flags(interface, &ifr)){
1297
if(debug){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1300
}
1301
return false;
1302
}
1303
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1305
}
1306
1307
/*
1308
* This function determines if a network interface is running
1309
*/
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1312
struct ifreq ifr;
1313
if(not get_flags(interface, &ifr)){
1314
if(debug){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1317
}
1318
return false;
1319
}
1320
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1322
}
1323
1324
__attribute__((nonnull, pure, warn_unused_result))
1277
1325
int notdotentries(const struct dirent *direntry){
1278
1326
/* Skip "." and ".." */
1279
1327
if(direntry->d_name[0] == '.'
1286
1334
}
1287
1335
1288
1336
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1289
1338
int runnable_hook(const struct dirent *direntry){
1290
1339
int ret;
1291
1340
size_t sret;
1299
1348
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1300
1349
"abcdefghijklmnopqrstuvwxyz"
1301
1350
"0123456789"
1302
"_-");
1351
"_.-");
1303
1352
if((direntry->d_name)[sret] != '\0'){
1304
1353
/* Contains non-allowed characters */
1305
1354
if(debug){
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1308
direntry->d_name);
1355
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1356
direntry->d_name);
1309
1357
}
1310
1358
return 0;
1311
1359
}
1312
1360
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1315
if(ret < 0){
1316
perror_plus("asprintf");
1317
return 0;
1318
}
1319
1320
ret = stat(fullname, &st);
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1321
1362
if(ret == -1){
1322
1363
if(debug){
1323
1364
perror_plus("Could not stat hook");
1327
1368
if(not (S_ISREG(st.st_mode))){
1328
1369
/* Not a regular file */
1329
1370
if(debug){
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1332
direntry->d_name);
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1372
direntry->d_name);
1333
1373
}
1334
1374
return 0;
1335
1375
}
1336
1376
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
1377
/* Not executable */
1338
1378
if(debug){
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1341
direntry->d_name);
1379
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1380
direntry->d_name);
1342
1381
}
1343
1382
return 0;
1344
1383
}
1384
if(debug){
1385
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1386
direntry->d_name);
1387
}
1345
1388
return 1;
1346
1389
}
1347
1390
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1349
1394
int ret;
1350
1395
struct timespec now;
1351
1396
struct timespec waited_time;
1352
1397
intmax_t block_time;
1353
1398
1354
1399
while(true){
1355
if(mc.current_server == NULL){
1356
if (debug){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1400
if(mc->current_server == NULL){
1401
if(debug){
1402
fprintf_plus(stderr, "Wait until first server is found."
1403
" No timeout!\n");
1359
1404
}
1360
1405
ret = avahi_simple_poll_iterate(s, -1);
1361
1406
} else {
1362
if (debug){
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1365
" or wait\n");
1407
if(debug){
1408
fprintf_plus(stderr, "Check current_server if we should run"
1409
" it, or wait\n");
1366
1410
}
1367
1411
/* the current time */
1368
1412
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1373
1417
/* Calculating in ms how long time between now and server
1374
1418
who we visted longest time ago. Now - last seen. */
1375
1419
waited_time.tv_sec = (now.tv_sec
1376
- mc.current_server->last_seen.tv_sec);
1420
- mc->current_server->last_seen.tv_sec);
1377
1421
waited_time.tv_nsec = (now.tv_nsec
1378
- mc.current_server->last_seen.tv_nsec);
1422
- mc->current_server->last_seen.tv_nsec);
1379
1423
/* total time is 10s/10,000ms.
1380
1424
Converting to s from ms by dividing by 1,000,
1381
1425
and ns to ms by dividing by 1,000,000. */
1383
1427
- ((intmax_t)waited_time.tv_sec * 1000))
1384
1428
- ((intmax_t)waited_time.tv_nsec / 1000000));
1385
1429
1386
if (debug){
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1430
if(debug){
1431
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1432
block_time);
1389
1433
}
1390
1434
1391
1435
if(block_time <= 0){
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1396
1440
if(ret == 0){
1397
avahi_simple_poll_quit(mc.simple_poll);
1441
avahi_simple_poll_quit(s);
1398
1442
return 0;
1399
1443
}
1400
1444
ret = clock_gettime(CLOCK_MONOTONIC,
1401
&mc.current_server->last_seen);
1445
&mc->current_server->last_seen);
1402
1446
if(ret == -1){
1403
1447
perror_plus("clock_gettime");
1404
1448
return -1;
1405
1449
}
1406
mc.current_server = mc.current_server->next;
1450
mc->current_server = mc->current_server->next;
1407
1451
block_time = 0; /* Call avahi to find new Mandos
1408
1452
servers, but don't block */
1409
1453
}
1411
1455
ret = avahi_simple_poll_iterate(s, (int)block_time);
1412
1456
}
1413
1457
if(ret != 0){
1414
if (ret > 0 or errno != EINTR){
1458
if(ret > 0 or errno != EINTR){
1415
1459
return (ret != 1) ? ret : 0;
1416
1460
}
1417
1461
}
1418
1462
}
1419
1463
}
1420
1464
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1471
ret_errno = errno;
1472
}
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1482
if(ret_errno != 0){
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
if(setuid(0) == -1){
1487
ret_errno = errno;
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1499
ret_errno = errno;
1500
}
1501
errno = old_errno;
1502
return ret_errno;
1503
}
1504
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1511
ret_errno = errno;
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1519
const float delay){
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1525
if(debug){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1528
}
1529
} else {
1530
perror_plus("open");
1531
}
1532
return;
1533
}
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1547
if(numhooks == -1){
1548
perror_plus("scandir");
1549
return;
1550
}
1551
struct dirent *direntry;
1552
int ret;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1556
if(debug){
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1558
direntry->d_name);
1559
}
1560
pid_t hook_pid = fork();
1561
if(hook_pid == 0){
1562
/* Child */
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1565
if(errno != 0){
1566
perror_plus("Failed to raise privileges");
1567
_exit(EX_NOPERM);
1568
}
1569
/* Set group */
1570
errno = 0;
1571
ret = setgid(0);
1572
if(ret == -1){
1573
perror_plus("setgid");
1574
_exit(EX_NOPERM);
1575
}
1576
/* Reset supplementary groups */
1577
errno = 0;
1578
ret = setgroups(0, NULL);
1579
if(ret == -1){
1580
perror_plus("setgroups");
1581
_exit(EX_NOPERM);
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
ret = setenv("DEVICE", interface, 1);
1604
if(ret == -1){
1605
perror_plus("setenv");
1606
_exit(EX_OSERR);
1607
}
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
if(ret == -1){
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("MODE", mode, 1);
1614
if(ret == -1){
1615
perror_plus("setenv");
1616
_exit(EX_OSERR);
1617
}
1618
char *delaystring;
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1620
if(ret == -1){
1621
perror_plus("asprintf");
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1626
free(delaystring);
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
free(delaystring);
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1633
if(ret == -1){
1634
perror_plus("setenv");
1635
_exit(EX_OSERR);
1636
}
1637
}
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
if(hook_fd == -1){
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1642
}
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1646
}
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
environ) == -1){
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1651
}
1652
} else {
1653
int status;
1654
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1655
perror_plus("waitpid");
1656
free(direntry);
1657
continue;
1658
}
1659
if(WIFEXITED(status)){
1660
if(WEXITSTATUS(status) != 0){
1661
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1662
" with status %d\n", direntry->d_name,
1663
WEXITSTATUS(status));
1664
free(direntry);
1665
continue;
1666
}
1667
} else if(WIFSIGNALED(status)){
1668
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1669
" signal %d\n", direntry->d_name,
1670
WTERMSIG(status));
1671
free(direntry);
1672
continue;
1673
} else {
1674
fprintf_plus(stderr, "Warning: network hook \"%s\""
1675
" crashed\n", direntry->d_name);
1676
free(direntry);
1677
continue;
1678
}
1679
}
1680
if(debug){
1681
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1682
direntry->d_name);
1683
}
1684
free(direntry);
1685
}
1686
free(direntries);
1687
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1688
perror_plus("close");
1689
} else {
1690
hookdir_fd = -1;
1691
}
1692
close(devnull);
1693
}
1694
1695
__attribute__((nonnull, warn_unused_result))
1696
error_t bring_up_interface(const char *const interface,
1697
const float delay){
1698
error_t old_errno = errno;
1699
int ret;
1700
struct ifreq network;
1701
unsigned int if_index = if_nametoindex(interface);
1702
if(if_index == 0){
1703
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1704
errno = old_errno;
1705
return ENXIO;
1706
}
1707
1708
if(quit_now){
1709
errno = old_errno;
1710
return EINTR;
1711
}
1712
1713
if(not interface_is_up(interface)){
1714
error_t ret_errno = 0, ioctl_errno = 0;
1715
if(not get_flags(interface, &network)){
1716
ret_errno = errno;
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", interface);
1719
errno = old_errno;
1720
return ret_errno;
1721
}
1722
network.ifr_flags |= IFF_UP; /* set flag */
1723
1724
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1725
if(sd == -1){
1726
ret_errno = errno;
1727
perror_plus("socket");
1728
errno = old_errno;
1729
return ret_errno;
1730
}
1731
1732
if(quit_now){
1733
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1734
if(ret == -1){
1735
perror_plus("close");
1736
}
1737
errno = old_errno;
1738
return EINTR;
1739
}
1740
1741
if(debug){
1742
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1743
interface);
1744
}
1745
1746
/* Raise privileges */
1747
ret_errno = raise_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to raise privileges");
1751
}
1752
1753
#ifdef __linux__
1754
int ret_linux;
1755
bool restore_loglevel = false;
1756
if(ret_errno == 0){
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret_linux = klogctl(8, NULL, 5);
1760
if(ret_linux == -1){
1761
perror_plus("klogctl");
1762
} else {
1763
restore_loglevel = true;
1764
}
1765
}
1766
#endif /* __linux__ */
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ioctl_errno = errno;
1769
#ifdef __linux__
1770
if(restore_loglevel){
1771
ret_linux = klogctl(7, NULL, 0);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1774
}
1775
}
1776
#endif /* __linux__ */
1777
1778
/* If raise_privileges() succeeded above */
1779
if(ret_errno == 0){
1780
/* Lower privileges */
1781
ret_errno = lower_privileges();
1782
if(ret_errno != 0){
1783
errno = ret_errno;
1784
perror_plus("Failed to lower privileges");
1785
}
1786
}
1787
1788
/* Close the socket */
1789
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1790
if(ret == -1){
1791
perror_plus("close");
1792
}
1793
1794
if(ret_setflags == -1){
1795
errno = ioctl_errno;
1796
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1797
errno = old_errno;
1798
return ioctl_errno;
1799
}
1800
} else if(debug){
1801
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1802
interface);
1803
}
1804
1805
/* Sleep checking until interface is running.
1806
Check every 0.25s, up to total time of delay */
1807
for(int i=0; i < delay * 4; i++){
1808
if(interface_is_running(interface)){
1809
break;
1810
}
1811
struct timespec sleeptime = { .tv_nsec = 250000000 };
1812
ret = nanosleep(&sleeptime, NULL);
1813
if(ret == -1 and errno != EINTR){
1814
perror_plus("nanosleep");
1815
}
1816
}
1817
1818
errno = old_errno;
1819
return 0;
1820
}
1821
1822
__attribute__((nonnull, warn_unused_result))
1823
error_t take_down_interface(const char *const interface){
1824
error_t old_errno = errno;
1825
struct ifreq network;
1826
unsigned int if_index = if_nametoindex(interface);
1827
if(if_index == 0){
1828
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1829
errno = old_errno;
1830
return ENXIO;
1831
}
1832
if(interface_is_up(interface)){
1833
error_t ret_errno = 0, ioctl_errno = 0;
1834
if(not get_flags(interface, &network) and debug){
1835
ret_errno = errno;
1836
fprintf_plus(stderr, "Failed to get flags for interface "
1837
"\"%s\"\n", interface);
1838
errno = old_errno;
1839
return ret_errno;
1840
}
1841
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1842
1843
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1844
if(sd == -1){
1845
ret_errno = errno;
1846
perror_plus("socket");
1847
errno = old_errno;
1848
return ret_errno;
1849
}
1850
1851
if(debug){
1852
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1853
interface);
1854
}
1855
1856
/* Raise privileges */
1857
ret_errno = raise_privileges();
1858
if(ret_errno != 0){
1859
errno = ret_errno;
1860
perror_plus("Failed to raise privileges");
1861
}
1862
1863
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1864
ioctl_errno = errno;
1865
1866
/* If raise_privileges() succeeded above */
1867
if(ret_errno == 0){
1868
/* Lower privileges */
1869
ret_errno = lower_privileges();
1870
if(ret_errno != 0){
1871
errno = ret_errno;
1872
perror_plus("Failed to lower privileges");
1873
}
1874
}
1875
1876
/* Close the socket */
1877
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1878
if(ret == -1){
1879
perror_plus("close");
1880
}
1881
1882
if(ret_setflags == -1){
1883
errno = ioctl_errno;
1884
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1885
errno = old_errno;
1886
return ioctl_errno;
1887
}
1888
} else if(debug){
1889
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1890
interface);
1891
}
1892
1893
errno = old_errno;
1894
return 0;
1895
}
1896
1421
1897
int main(int argc, char *argv[]){
1898
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1899
.priority = "SECURE256:!CTYPE-X.509:"
1900
"+CTYPE-OPENPGP", .current_server = NULL,
1901
.interfaces = NULL, .interfaces_size = 0 };
1422
1902
AvahiSServiceBrowser *sb = NULL;
1423
int error;
1903
error_t ret_errno;
1424
1904
int ret;
1425
1905
intmax_t tmpmax;
1426
1906
char *tmp;
1427
1907
int exitcode = EXIT_SUCCESS;
1428
const char *interface = "";
1429
struct ifreq network;
1430
int sd = -1;
1431
bool take_down_interface = false;
1432
uid_t uid;
1433
gid_t gid;
1434
char tempdir[] = "/tmp/mandosXXXXXX";
1435
bool tempdir_created = false;
1908
char *interfaces_to_take_down = NULL;
1909
size_t interfaces_to_take_down_size = 0;
1910
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1911
char old_tempdir[] = "/tmp/mandosXXXXXX";
1912
char *tempdir = NULL;
1436
1913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1437
1914
const char *seckey = PATHDIR "/" SECKEY;
1438
1915
const char *pubkey = PATHDIR "/" PUBKEY;
1916
char *interfaces_hooks = NULL;
1439
1917
1440
1918
bool gnutls_initialized = false;
1441
1919
bool gpgme_initialized = false;
1503
1981
.group = 2 },
1504
1982
{ .name = "retry", .key = 132,
1505
1983
.arg = "SECONDS",
1506
.doc = "Retry interval used when denied by the mandos server",
1984
.doc = "Retry interval used when denied by the Mandos server",
1507
1985
.group = 2 },
1508
1986
{ .name = "network-hook-dir", .key = 133,
1509
1987
.arg = "DIR",
1532
2010
connect_to = arg;
1533
2011
break;
1534
2012
case 'i': /* --interface */
1535
interface = arg;
2013
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2014
arg, (int)',');
2015
if(ret_errno != 0){
2016
argp_error(state, "%s", strerror(ret_errno));
2017
}
1536
2018
break;
1537
2019
case 's': /* --seckey */
1538
2020
seckey = arg;
1581
2063
argp_state_help(state, state->out_stream,
1582
2064
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1583
2065
case 'V': /* --version */
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
2066
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1586
2067
exit(argp_err_exit_status);
1587
2068
break;
1588
2069
default:
1615
2096
{
1616
2097
/* Work around Debian bug #633582:
1617
2098
<http://bugs.debian.org/633582> */
1618
struct stat st;
1619
1620
/* Re-raise priviliges */
1621
errno = 0;
1622
ret = seteuid(0);
1623
if(ret == -1){
1624
perror_plus("seteuid");
1625
}
1626
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1631
} else {
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1633
if(ret == -1){
1634
perror_plus("fstat");
1635
} else {
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1638
if(ret == -1){
1639
perror_plus("fchown");
1640
}
1641
}
1642
}
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1644
}
1645
}
1646
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1651
} else {
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1653
if(ret == -1){
1654
perror_plus("fstat");
1655
} else {
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1658
if(ret == -1){
1659
perror_plus("fchown");
1660
}
1661
}
1662
}
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1664
}
1665
}
1666
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
}
1674
1675
/* Find network hooks and run them */
1676
{
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1680
alphasort);
1681
if(numhooks == -1){
1682
perror_plus("scandir");
2099
2100
/* Re-raise privileges */
2101
ret_errno = raise_privileges();
2102
if(ret_errno != 0){
2103
errno = ret_errno;
2104
perror_plus("Failed to raise privileges");
1683
2105
} else {
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1689
if(ret < 0){
1690
perror_plus("asprintf");
1691
continue;
1692
}
1693
pid_t hook_pid = fork();
1694
if(hook_pid == 0){
1695
/* Child */
1696
dup2(devnull, STDIN_FILENO);
1697
close(devnull);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1700
if(ret == -1){
1701
perror_plus("setenv");
1702
exit(1);
1703
}
1704
ret = setenv("DEVICE", interface, 1);
1705
if(ret == -1){
1706
perror_plus("setenv");
1707
exit(1);
1708
}
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1710
if(ret == -1){
1711
perror_plus("setenv");
1712
exit(1);
1713
}
1714
ret = setenv("MODE", "start", 1);
1715
if(ret == -1){
1716
perror_plus("setenv");
1717
exit(1);
1718
}
1719
char *delaystring;
1720
ret = asprintf(&delaystring, "%f", delay);
1721
if(ret == -1){
1722
perror_plus("asprintf");
1723
exit(1);
1724
}
1725
ret = setenv("DELAY", delaystring, 1);
1726
if(ret == -1){
1727
free(delaystring);
1728
perror_plus("setenv");
1729
exit(1);
1730
}
1731
free(delaystring);
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1734
} else {
1735
int status;
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1738
free(fullname);
1739
continue;
1740
}
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1747
free(fullname);
1748
continue;
1749
}
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1754
WTERMSIG(status));
1755
free(fullname);
1756
continue;
1757
} else {
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1760
direntry->d_name);
1761
free(fullname);
1762
continue;
1763
}
1764
}
1765
free(fullname);
1766
if(quit_now){
1767
goto end;
1768
}
1769
}
1770
close(devnull);
1771
}
2106
struct stat st;
2107
2108
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2109
int seckey_fd = open(seckey, O_RDONLY);
2110
if(seckey_fd == -1){
2111
perror_plus("open");
2112
} else {
2113
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2114
if(ret == -1){
2115
perror_plus("fstat");
2116
} else {
2117
if(S_ISREG(st.st_mode)
2118
and st.st_uid == 0 and st.st_gid == 0){
2119
ret = fchown(seckey_fd, uid, gid);
2120
if(ret == -1){
2121
perror_plus("fchown");
2122
}
2123
}
2124
}
2125
TEMP_FAILURE_RETRY(close(seckey_fd));
2126
}
2127
}
2128
2129
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2130
int pubkey_fd = open(pubkey, O_RDONLY);
2131
if(pubkey_fd == -1){
2132
perror_plus("open");
2133
} else {
2134
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2135
if(ret == -1){
2136
perror_plus("fstat");
2137
} else {
2138
if(S_ISREG(st.st_mode)
2139
and st.st_uid == 0 and st.st_gid == 0){
2140
ret = fchown(pubkey_fd, uid, gid);
2141
if(ret == -1){
2142
perror_plus("fchown");
2143
}
2144
}
2145
}
2146
TEMP_FAILURE_RETRY(close(pubkey_fd));
2147
}
2148
}
2149
2150
/* Lower privileges */
2151
ret_errno = lower_privileges();
2152
if(ret_errno != 0){
2153
errno = ret_errno;
2154
perror_plus("Failed to lower privileges");
2155
}
2156
}
2157
}
2158
2159
/* Remove invalid interface names (except "none") */
2160
{
2161
char *interface = NULL;
2162
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2163
interface))){
2164
if(strcmp(interface, "none") != 0
2165
and if_nametoindex(interface) == 0){
2166
if(interface[0] != '\0'){
2167
fprintf_plus(stderr, "Not using nonexisting interface"
2168
" \"%s\"\n", interface);
2169
}
2170
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2171
interface = NULL;
2172
}
2173
}
2174
}
2175
2176
/* Run network hooks */
2177
{
2178
if(mc.interfaces != NULL){
2179
interfaces_hooks = malloc(mc.interfaces_size);
2180
if(interfaces_hooks == NULL){
2181
perror_plus("malloc");
2182
goto end;
2183
}
2184
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2185
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2186
}
2187
run_network_hooks("start", interfaces_hooks != NULL ?
2188
interfaces_hooks : "", delay);
1772
2189
}
1773
2190
1774
2191
if(not debug){
1775
2192
avahi_set_log_function(empty_log);
1776
2193
}
1777
2194
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1812
2195
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
2196
from the signal handler */
1814
2197
/* Initialize the pseudo-RNG for Avahi */
1815
2198
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
2199
simple_poll = avahi_simple_poll_new();
2200
if(simple_poll == NULL){
2201
fprintf_plus(stderr,
2202
"Avahi: Failed to create simple poll object.\n");
1820
2203
exitcode = EX_UNAVAILABLE;
1821
2204
goto end;
1822
2205
}
1884
2267
}
1885
2268
}
1886
2269
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1894
goto end;
1895
}
1896
1897
if(quit_now){
1898
goto end;
1899
}
1900
1901
/* Re-raise priviliges */
1902
errno = 0;
1903
ret = seteuid(0);
1904
if(ret == -1){
1905
perror_plus("seteuid");
1906
}
1907
1908
#ifdef __linux__
1909
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1910
messages about the network interface to mess up the prompt */
1911
ret = klogctl(8, NULL, 5);
1912
bool restore_loglevel = true;
1913
if(ret == -1){
1914
restore_loglevel = false;
1915
perror_plus("klogctl");
1916
}
1917
#endif /* __linux__ */
1918
1919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
if(sd < 0){
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
1923
#ifdef __linux__
1924
if(restore_loglevel){
1925
ret = klogctl(7, NULL, 0);
1926
if(ret == -1){
1927
perror_plus("klogctl");
1928
}
1929
}
1930
#endif /* __linux__ */
1931
/* Lower privileges */
1932
errno = 0;
1933
ret = seteuid(uid);
1934
if(ret == -1){
1935
perror_plus("seteuid");
1936
}
1937
goto end;
1938
}
1939
strcpy(network.ifr_name, interface);
1940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
if(ret == -1){
1942
perror_plus("ioctl SIOCGIFFLAGS");
1943
#ifdef __linux__
1944
if(restore_loglevel){
1945
ret = klogctl(7, NULL, 0);
1946
if(ret == -1){
1947
perror_plus("klogctl");
1948
}
1949
}
1950
#endif /* __linux__ */
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
if((network.ifr_flags & IFF_UP) == 0){
1961
network.ifr_flags |= IFF_UP;
1962
take_down_interface = true;
1963
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
if(ret == -1){
1965
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
1968
#ifdef __linux__
1969
if(restore_loglevel){
1970
ret = klogctl(7, NULL, 0);
1971
if(ret == -1){
1972
perror_plus("klogctl");
2270
/* If no interfaces were specified, make a list */
2271
if(mc.interfaces == NULL){
2272
struct dirent **direntries = NULL;
2273
/* Look for any good interfaces */
2274
ret = scandir(sys_class_net, &direntries, good_interface,
2275
alphasort);
2276
if(ret >= 1){
2277
/* Add all found interfaces to interfaces list */
2278
for(int i = 0; i < ret; ++i){
2279
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2280
direntries[i]->d_name);
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("argz_add");
2284
free(direntries[i]);
2285
continue;
2286
}
2287
if(debug){
2288
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2289
direntries[i]->d_name);
2290
}
2291
free(direntries[i]);
2292
}
2293
free(direntries);
2294
} else {
2295
if(ret == 0){
2296
free(direntries);
2297
}
2298
fprintf_plus(stderr, "Could not find a network interface\n");
2299
exitcode = EXIT_FAILURE;
2300
goto end;
2301
}
2302
}
2303
2304
/* Bring up interfaces which are down, and remove any "none"s */
2305
{
2306
char *interface = NULL;
2307
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2308
interface))){
2309
/* If interface name is "none", stop bringing up interfaces.
2310
Also remove all instances of "none" from the list */
2311
if(strcmp(interface, "none") == 0){
2312
argz_delete(&mc.interfaces, &mc.interfaces_size,
2313
interface);
2314
interface = NULL;
2315
while((interface = argz_next(mc.interfaces,
2316
mc.interfaces_size, interface))){
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
1973
2321
}
1974
2322
}
1975
#endif /* __linux__ */
1976
/* Lower privileges */
1977
errno = 0;
1978
ret = seteuid(uid);
1979
if(ret == -1){
1980
perror_plus("seteuid");
1981
}
1982
goto end;
1983
}
1984
}
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1987
for(int i=0; i < delay * 4; i++){
1988
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
if(ret == -1){
1990
perror_plus("ioctl SIOCGIFFLAGS");
1991
} else if(network.ifr_flags & IFF_RUNNING){
1992
2323
break;
1993
2324
}
1994
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
ret = nanosleep(&sleeptime, NULL);
1996
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
1998
}
1999
}
2000
if(not take_down_interface){
2001
/* We won't need the socket anymore */
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
if(ret == -1){
2004
perror_plus("close");
2005
}
2006
}
2007
#ifdef __linux__
2008
if(restore_loglevel){
2009
/* Restores kernel loglevel to default */
2010
ret = klogctl(7, NULL, 0);
2011
if(ret == -1){
2012
perror_plus("klogctl");
2013
}
2014
}
2015
#endif /* __linux__ */
2016
/* Lower privileges */
2017
errno = 0;
2018
if(take_down_interface){
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2024
} else {
2025
/* Lower privileges permanently */
2026
ret = setuid(uid);
2027
if(ret == -1){
2028
perror_plus("setuid");
2029
}
2030
}
2325
bool interface_was_up = interface_is_up(interface);
2326
errno = bring_up_interface(interface, delay);
2327
if(not interface_was_up){
2328
if(errno != 0){
2329
perror_plus("Failed to bring up interface");
2330
} else {
2331
errno = argz_add(&interfaces_to_take_down,
2332
&interfaces_to_take_down_size,
2333
interface);
2334
if(errno != 0){
2335
perror_plus("argz_add");
2336
}
2337
}
2338
}
2339
}
2340
if(debug and (interfaces_to_take_down == NULL)){
2341
fprintf_plus(stderr, "No interfaces were brought up\n");
2342
}
2343
}
2344
2345
/* If we only got one interface, explicitly use only that one */
2346
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2347
if(debug){
2348
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2349
mc.interfaces);
2350
}
2351
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2031
2352
}
2032
2353
2033
2354
if(quit_now){
2034
2355
goto end;
2035
2356
}
2036
2357
2037
ret = init_gnutls_global(pubkey, seckey);
2358
ret = init_gnutls_global(pubkey, seckey, &mc);
2038
2359
if(ret == -1){
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2360
fprintf_plus(stderr, "init_gnutls_global failed\n");
2041
2361
exitcode = EX_UNAVAILABLE;
2042
2362
goto end;
2043
2363
} else {
2048
2368
goto end;
2049
2369
}
2050
2370
2051
if(mkdtemp(tempdir) == NULL){
2371
/* Try /run/tmp before /tmp */
2372
tempdir = mkdtemp(run_tempdir);
2373
if(tempdir == NULL and errno == ENOENT){
2374
if(debug){
2375
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2376
run_tempdir, old_tempdir);
2377
}
2378
tempdir = mkdtemp(old_tempdir);
2379
}
2380
if(tempdir == NULL){
2052
2381
perror_plus("mkdtemp");
2053
2382
goto end;
2054
2383
}
2055
tempdir_created = true;
2056
2384
2057
2385
if(quit_now){
2058
2386
goto end;
2059
2387
}
2060
2388
2061
if(not init_gpgme(pubkey, seckey, tempdir)){
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
2389
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2390
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2391
exitcode = EX_UNAVAILABLE;
2065
2392
goto end;
2066
2393
} else {
2075
2402
/* Connect directly, do not use Zeroconf */
2076
2403
/* (Mainly meant for debugging) */
2077
2404
char *address = strrchr(connect_to, ':');
2405
2078
2406
if(address == NULL){
2079
fprintf(stderr, "Mandos plugin mandos-client: "
2080
"No colon in address\n");
2407
fprintf_plus(stderr, "No colon in address\n");
2081
2408
exitcode = EX_USAGE;
2082
2409
goto end;
2083
2410
}
2086
2413
goto end;
2087
2414
}
2088
2415
2089
uint16_t port;
2416
in_port_t port;
2090
2417
errno = 0;
2091
2418
tmpmax = strtoimax(address+1, &tmp, 10);
2092
2419
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2093
or tmpmax != (uint16_t)tmpmax){
2094
fprintf(stderr, "Mandos plugin mandos-client: "
2095
"Bad port number\n");
2420
or tmpmax != (in_port_t)tmpmax){
2421
fprintf_plus(stderr, "Bad port number\n");
2096
2422
exitcode = EX_USAGE;
2097
2423
goto end;
2098
2424
}
2099
2425
2100
2426
if(quit_now){
2101
2427
goto end;
2102
2428
}
2103
2429
2104
port = (uint16_t)tmpmax;
2430
port = (in_port_t)tmpmax;
2105
2431
*address = '\0';
2106
2432
/* Colon in address indicates IPv6 */
2107
2433
int af;
2123
2449
}
2124
2450
2125
2451
while(not quit_now){
2126
ret = start_mandos_communication(address, port, if_index, af);
2452
ret = start_mandos_communication(address, port, if_index, af,
2453
&mc);
2127
2454
if(quit_now or ret == 0){
2128
2455
break;
2129
2456
}
2130
2457
if(debug){
2131
fprintf(stderr, "Mandos plugin mandos-client: "
2132
"Retrying in %d seconds\n", (int)retry_interval);
2458
fprintf_plus(stderr, "Retrying in %d seconds\n",
2459
(int)retry_interval);
2133
2460
}
2134
sleep((int)retry_interval);
2461
sleep((unsigned int)retry_interval);
2135
2462
}
2136
2463
2137
if (not quit_now){
2464
if(not quit_now){
2138
2465
exitcode = EXIT_SUCCESS;
2139
2466
}
2140
2467
2155
2482
config.publish_domain = 0;
2156
2483
2157
2484
/* Allocate a new server */
2158
mc.server = avahi_server_new(avahi_simple_poll_get
2159
(mc.simple_poll), &config, NULL,
2160
NULL, &error);
2485
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2486
&config, NULL, NULL, &ret_errno);
2161
2487
2162
2488
/* Free the Avahi configuration data */
2163
2489
avahi_server_config_free(&config);
2165
2491
2166
2492
/* Check if creating the Avahi server object succeeded */
2167
2493
if(mc.server == NULL){
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2494
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2495
avahi_strerror(ret_errno));
2171
2496
exitcode = EX_UNAVAILABLE;
2172
2497
goto end;
2173
2498
}
2179
2504
/* Create the Avahi service browser */
2180
2505
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
2506
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
2507
NULL, 0, browse_callback,
2508
(void *)&mc);
2183
2509
if(sb == NULL){
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
2186
avahi_strerror(avahi_server_errno(mc.server)));
2510
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2511
avahi_strerror(avahi_server_errno(mc.server)));
2187
2512
exitcode = EX_UNAVAILABLE;
2188
2513
goto end;
2189
2514
}
2195
2520
/* Run the main loop */
2196
2521
2197
2522
if(debug){
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2523
fprintf_plus(stderr, "Starting Avahi loop search\n");
2200
2524
}
2201
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2525
2526
ret = avahi_loop_with_timeout(simple_poll,
2527
(int)(retry_interval * 1000), &mc);
2204
2528
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2529
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2530
(ret == 0) ? "successfully" : "with error");
2208
2531
}
2209
2532
2210
2533
end:
2211
2534
2212
2535
if(debug){
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
2536
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2215
2537
}
2216
2538
2217
2539
/* Cleanup things */
2540
free(mc.interfaces);
2541
2218
2542
if(sb != NULL)
2219
2543
avahi_s_service_browser_free(sb);
2220
2544
2221
2545
if(mc.server != NULL)
2222
2546
avahi_server_free(mc.server);
2223
2547
2224
if(mc.simple_poll != NULL)
2225
avahi_simple_poll_free(mc.simple_poll);
2548
if(simple_poll != NULL)
2549
avahi_simple_poll_free(simple_poll);
2226
2550
2227
2551
if(gnutls_initialized){
2228
2552
gnutls_certificate_free_credentials(mc.cred);
2233
2557
if(gpgme_initialized){
2234
2558
gpgme_release(mc.ctx);
2235
2559
}
2236
2560
2237
2561
/* Cleans up the circular linked list of Mandos servers the client
2238
2562
has seen */
2239
2563
if(mc.current_server != NULL){
2240
2564
mc.current_server->prev->next = NULL;
2241
2565
while(mc.current_server != NULL){
2242
2566
server *next = mc.current_server->next;
2567
#ifdef __GNUC__
2568
#pragma GCC diagnostic push
2569
#pragma GCC diagnostic ignored "-Wcast-qual"
2570
#endif
2571
free((char *)(mc.current_server->ip));
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic pop
2574
#endif
2243
2575
free(mc.current_server);
2244
2576
mc.current_server = next;
2245
2577
}
2246
2578
}
2247
2579
2248
/* XXX run network hooks "stop" here */
2249
2250
/* Take down the network interface */
2251
if(take_down_interface){
2252
/* Re-raise priviliges */
2253
errno = 0;
2254
ret = seteuid(0);
2255
if(ret == -1){
2256
perror_plus("seteuid");
2580
/* Re-raise privileges */
2581
{
2582
ret_errno = raise_privileges();
2583
if(ret_errno != 0){
2584
errno = ret_errno;
2585
perror_plus("Failed to raise privileges");
2586
} else {
2587
2588
/* Run network hooks */
2589
run_network_hooks("stop", interfaces_hooks != NULL ?
2590
interfaces_hooks : "", delay);
2591
2592
/* Take down the network interfaces which were brought up */
2593
{
2594
char *interface = NULL;
2595
while((interface=argz_next(interfaces_to_take_down,
2596
interfaces_to_take_down_size,
2597
interface))){
2598
ret_errno = take_down_interface(interface);
2599
if(ret_errno != 0){
2600
errno = ret_errno;
2601
perror_plus("Failed to take down interface");
2602
}
2603
}
2604
if(debug and (interfaces_to_take_down == NULL)){
2605
fprintf_plus(stderr, "No interfaces needed to be taken"
2606
" down\n");
2607
}
2608
}
2257
2609
}
2258
if(geteuid() == 0){
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2265
if(ret == -1){
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2267
}
2268
}
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2610
2611
ret_errno = lower_privileges_permanently();
2612
if(ret_errno != 0){
2613
errno = ret_errno;
2614
perror_plus("Failed to lower privileges permanently");
2279
2615
}
2280
2616
}
2281
2617
2618
free(interfaces_to_take_down);
2619
free(interfaces_hooks);
2620
2282
2621
/* Removes the GPGME temp directory and all files inside */
2283
if(tempdir_created){
2622
if(tempdir != NULL){
2284
2623
struct dirent **direntries = NULL;
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2287
alphasort);
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
2290
direntry = direntries[i];
2291
char *fullname = NULL;
2292
ret = asprintf(&fullname, "%s/%s", tempdir,
2293
direntry->d_name);
2294
if(ret < 0){
2295
perror_plus("asprintf");
2296
continue;
2297
}
2298
ret = remove(fullname);
2299
if(ret == -1){
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2302
}
2303
free(fullname);
2624
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2625
O_NOFOLLOW));
2626
if(tempdir_fd == -1){
2627
perror_plus("open");
2628
} else {
2629
#ifdef __GLIBC__
2630
#if __GLIBC_PREREQ(2, 15)
2631
int numentries = scandirat(tempdir_fd, ".", &direntries,
2632
notdotentries, alphasort);
2633
#else /* not __GLIBC_PREREQ(2, 15) */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2635
alphasort);
2636
#endif /* not __GLIBC_PREREQ(2, 15) */
2637
#else /* not __GLIBC__ */
2638
int numentries = scandir(tempdir, &direntries, notdotentries,
2639
alphasort);
2640
#endif /* not __GLIBC__ */
2641
if(numentries >= 0){
2642
for(int i = 0; i < numentries; i++){
2643
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2644
if(ret == -1){
2645
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2646
" \"%s\", 0): %s\n", tempdir,
2647
direntries[i]->d_name, strerror(errno));
2648
}
2649
free(direntries[i]);
2650
}
2651
2652
/* need to clean even if 0 because man page doesn't specify */
2653
free(direntries);
2654
if(numentries == -1){
2655
perror_plus("scandir");
2656
}
2657
ret = rmdir(tempdir);
2658
if(ret == -1 and errno != ENOENT){
2659
perror_plus("rmdir");
2660
}
2304
2661
}
2305
}
2306
2307
/* need to clean even if 0 because man page doesn't specify */
2308
free(direntries);
2309
if (numentries == -1){
2310
perror_plus("scandir");
2311
}
2312
ret = rmdir(tempdir);
2313
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");
2662
TEMP_FAILURE_RETRY(close(tempdir_fd));
2315
2663
}
2316
2664
}
2317
2665
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0