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- Committer: Teddy Hogeborn
- Date: 2009-01-26 23:47:44 UTC
- mto: (24.1.131 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090126234744-c19lb7zn1qsrcwmv
* debian/control (mandos/Depends): Added "python-gobject".
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
46
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
56
struct in6_addr, inet_pton(),
57
connect() */
58
#include <fcntl.h> /* open() */
61
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
60
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
#include <netinet/in.h>
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
80
74
#include <argp.h> /* struct argp_option, error_t, struct
81
75
argp_state, struct argp,
82
76
argp_parse(), ARGP_KEY_ARG,
83
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
99
#ifdef __linux__
100
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
102
78
103
79
/* Avahi */
104
80
/* All Avahi types, constants and functions
118
94
init_gnutls_session(),
119
95
GNUTLS_* */
120
96
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
97
/* gnutls_certificate_set_openpgp_key_file(),
98
GNUTLS_OPENPGP_FMT_BASE64 */
123
99
124
100
/* GPGME */
125
101
#include <gpgme.h> /* All GPGME types, constants and
133
109
#define PATHDIR "/conf/conf.d/mandos"
134
110
#define SECKEY "seckey.txt"
135
111
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
112
138
113
bool debug = false;
139
114
static const char mandos_protocol_version[] = "1";
140
115
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
116
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
117
160
118
/* Used for passing in values through the Avahi callback functions */
161
119
typedef struct {
120
AvahiSimplePoll *simple_poll;
162
121
AvahiServer *server;
163
122
gnutls_certificate_credentials_t cred;
164
123
unsigned int dh_bits;
165
124
gnutls_dh_params_t dh_params;
166
125
const char *priority;
167
126
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
127
} mandos_context;
172
128
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
129
/*
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
130
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
131
* "buffer_capacity" is how much is currently allocated,
201
132
* "buffer_length" is how much is already used.
202
133
*/
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
134
size_t adjustbuffer(char **buffer, size_t buffer_length,
135
size_t buffer_capacity){
206
136
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
137
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
138
if(buffer == NULL){
213
139
return 0;
214
140
}
215
*buffer = new_buf;
216
141
buffer_capacity += BUFFER_SIZE;
217
142
}
218
143
return buffer_capacity;
219
144
}
220
145
221
/* Add server to set of servers to retry periodically */
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){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
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;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
269
146
/*
270
147
* Initialize GPGME.
271
148
*/
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){
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
150
const char *pubkey, const char *tempdir){
151
int ret;
277
152
gpgme_error_t rc;
278
153
gpgme_engine_info_t engine_info;
279
154
155
280
156
/*
281
* Helper function to insert pub and seckey to the engine keyring.
157
* Helper function to insert pub and seckey to the enigne keyring.
282
158
*/
283
bool import_key(const char * const filename){
284
int ret;
159
bool import_key(const char *filename){
285
160
int fd;
286
161
gpgme_data_t pgp_data;
287
162
288
163
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
164
if(fd == -1){
290
perror_plus("open");
165
perror("open");
291
166
return false;
292
167
}
293
168
294
169
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
170
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
171
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
298
173
return false;
299
174
}
300
175
301
176
rc = gpgme_op_import(mc->ctx, pgp_data);
302
177
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
178
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
305
180
return false;
306
181
}
307
182
308
ret = close(fd);
183
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
184
if(ret == -1){
310
perror_plus("close");
185
perror("close");
311
186
}
312
187
gpgme_data_release(pgp_data);
313
188
return true;
314
189
}
315
190
316
191
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
192
fprintf(stderr, "Initialize gpgme\n");
318
193
}
319
194
320
195
/* Init GPGME */
321
196
gpgme_check_version(NULL);
322
197
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
198
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
199
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
326
201
return false;
327
202
}
328
203
329
/* Set GPGME home directory for the OpenPGP engine only */
204
/* Set GPGME home directory for the OpenPGP engine only */
330
205
rc = gpgme_get_engine_info(&engine_info);
331
206
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
207
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
208
gpgme_strsource(rc), gpgme_strerror(rc));
334
209
return false;
335
210
}
336
211
while(engine_info != NULL){
342
217
engine_info = engine_info->next;
343
218
}
344
219
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
220
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
221
return false;
348
222
}
349
223
350
224
/* Create new GPGME "context" */
351
225
rc = gpgme_new(&(mc->ctx));
352
226
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
227
fprintf(stderr, "bad gpgme_new: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
356
229
return false;
357
230
}
358
231
360
233
return false;
361
234
}
362
235
363
return true;
236
return true;
364
237
}
365
238
366
239
/*
367
240
* Decrypt OpenPGP data.
368
241
* Returns -1 on error
369
242
*/
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
243
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
244
const char *cryptotext,
372
245
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
246
char **plaintext){
375
247
gpgme_data_t dh_crypto, dh_plain;
376
248
gpgme_error_t rc;
377
249
ssize_t ret;
379
251
ssize_t plaintext_length = 0;
380
252
381
253
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
254
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
255
}
384
256
385
257
/* Create new GPGME data buffer from memory cryptotext */
386
258
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
259
0);
388
260
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
261
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
391
263
return -1;
392
264
}
393
265
394
266
/* Create new empty GPGME data buffer for the plaintext */
395
267
rc = gpgme_data_new(&dh_plain);
396
268
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
269
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
400
271
gpgme_data_release(dh_crypto);
401
272
return -1;
402
273
}
405
276
data buffer */
406
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
278
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
410
281
plaintext_length = -1;
411
282
if(debug){
412
283
gpgme_decrypt_result_t result;
413
284
result = gpgme_op_decrypt_result(mc->ctx);
414
285
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
286
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
287
} else {
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);
288
fprintf(stderr, "Unsupported algorithm: %s\n",
289
result->unsupported_algorithm);
290
fprintf(stderr, "Wrong key usage: %u\n",
291
result->wrong_key_usage);
421
292
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
293
fprintf(stderr, "File name: %s\n", result->file_name);
423
294
}
424
295
gpgme_recipient_t recipient;
425
296
recipient = result->recipients;
426
while(recipient != NULL){
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");
434
recipient = recipient->next;
297
if(recipient){
298
while(recipient != NULL){
299
fprintf(stderr, "Public key algorithm: %s\n",
300
gpgme_pubkey_algo_name(recipient->pubkey_algo));
301
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
302
fprintf(stderr, "Secret key available: %s\n",
303
recipient->status == GPG_ERR_NO_SECKEY
304
? "No" : "Yes");
305
recipient = recipient->next;
306
}
435
307
}
436
308
}
437
309
}
439
311
}
440
312
441
313
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
314
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
315
}
444
316
445
317
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
318
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
319
perror("gpgme_data_seek");
448
320
plaintext_length = -1;
449
321
goto decrypt_end;
450
322
}
451
323
452
324
*plaintext = NULL;
453
325
while(true){
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
326
plaintext_capacity = adjustbuffer(plaintext,
327
(size_t)plaintext_length,
328
plaintext_capacity);
457
329
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
330
perror("adjustbuffer");
331
plaintext_length = -1;
332
goto decrypt_end;
461
333
}
462
334
463
335
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
468
340
break;
469
341
}
470
342
if(ret < 0){
471
perror_plus("gpgme_data_read");
343
perror("gpgme_data_read");
472
344
plaintext_length = -1;
473
345
goto decrypt_end;
474
346
}
476
348
}
477
349
478
350
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
351
fprintf(stderr, "Decrypted password is: ");
480
352
for(ssize_t i = 0; i < plaintext_length; i++){
481
353
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
354
}
493
365
return plaintext_length;
494
366
}
495
367
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
368
static const char * safer_gnutls_strerror(int value) {
369
const char *ret = gnutls_strerror(value); /* Spurious warning from
370
-Wunreachable-code */
371
if(ret == NULL)
372
ret = "(unknown)";
373
return ret;
507
374
}
508
375
509
376
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
377
static void debuggnutls(__attribute__((unused)) int level,
512
378
const char* string){
513
fprintf_plus(stderr, "GnuTLS: %s", string);
379
fprintf(stderr, "GnuTLS: %s", string);
514
380
}
515
381
516
__attribute__((nonnull, warn_unused_result))
517
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
382
static int init_gnutls_global(mandos_context *mc,
383
const char *pubkeyfilename,
384
const char *seckeyfilename){
521
385
int ret;
522
unsigned int uret;
523
386
524
387
if(debug){
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
388
fprintf(stderr, "Initializing GnuTLS\n");
526
389
}
527
390
528
391
ret = gnutls_global_init();
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
392
if(ret != GNUTLS_E_SUCCESS) {
393
fprintf(stderr, "GnuTLS global_init: %s\n",
394
safer_gnutls_strerror(ret));
532
395
return -1;
533
396
}
534
397
541
404
}
542
405
543
406
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
407
gnutls_certificate_allocate_credentials(&mc->cred);
545
408
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
409
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
410
* from
411
* -Wunreachable-code
412
*/
413
safer_gnutls_strerror(ret));
548
414
gnutls_global_deinit();
549
415
return -1;
550
416
}
551
417
552
418
if(debug){
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
419
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
420
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
421
seckeyfilename);
557
422
}
558
423
559
424
ret = gnutls_certificate_set_openpgp_key_file
560
425
(mc->cred, pubkeyfilename, seckeyfilename,
561
426
GNUTLS_OPENPGP_FMT_BASE64);
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
427
if(ret != GNUTLS_E_SUCCESS) {
428
fprintf(stderr,
429
"Error[%d] while reading the OpenPGP key pair ('%s',"
430
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
431
fprintf(stderr, "The GnuTLS error is: %s\n",
432
safer_gnutls_strerror(ret));
568
433
goto globalfail;
569
434
}
570
435
571
436
/* GnuTLS server initialization */
572
437
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
438
if(ret != GNUTLS_E_SUCCESS) {
439
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
440
" %s\n", safer_gnutls_strerror(ret));
441
goto globalfail;
442
}
443
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
444
if(ret != GNUTLS_E_SUCCESS) {
445
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
446
safer_gnutls_strerror(ret));
447
goto globalfail;
448
}
449
751
450
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
752
451
753
452
return 0;
760
459
return -1;
761
460
}
762
461
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
462
static int init_gnutls_session(mandos_context *mc,
463
gnutls_session_t *session){
766
464
int ret;
767
465
/* GnuTLS session creation */
768
do {
769
ret = gnutls_init(session, GNUTLS_SERVER);
770
if(quit_now){
771
return -1;
772
}
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
466
ret = gnutls_init(session, GNUTLS_SERVER);
774
467
if(ret != GNUTLS_E_SUCCESS){
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
468
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
469
safer_gnutls_strerror(ret));
778
470
}
779
471
780
472
{
781
473
const char *err;
782
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
784
if(quit_now){
785
gnutls_deinit(*session);
786
return -1;
787
}
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
789
if(ret != GNUTLS_E_SUCCESS){
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
474
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
475
if(ret != GNUTLS_E_SUCCESS) {
476
fprintf(stderr, "Syntax error at: %s\n", err);
477
fprintf(stderr, "GnuTLS error: %s\n",
478
safer_gnutls_strerror(ret));
793
479
gnutls_deinit(*session);
794
480
return -1;
795
481
}
796
482
}
797
483
798
do {
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
801
if(quit_now){
802
gnutls_deinit(*session);
803
return -1;
804
}
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
806
if(ret != GNUTLS_E_SUCCESS){
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
484
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
485
mc->cred);
486
if(ret != GNUTLS_E_SUCCESS) {
487
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
488
safer_gnutls_strerror(ret));
809
489
gnutls_deinit(*session);
810
490
return -1;
811
491
}
812
492
813
493
/* ignore client certificate if any. */
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
494
gnutls_certificate_server_set_request(*session,
495
GNUTLS_CERT_IGNORE);
496
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
815
498
816
499
return 0;
817
500
}
820
503
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
504
__attribute__((unused)) const char *txt){}
822
505
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = close(devnull);
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
close(helperdir_fd);
958
_exit(EX_UNAVAILABLE);
959
}
960
close(helperdir_fd);
961
#ifdef __GNUC__
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
964
#endif
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
968
environ) == -1){
969
#ifdef __GNUC__
970
#pragma GCC diagnostic pop
971
#endif
972
perror_plus("fexecve");
973
_exit(EXIT_FAILURE);
974
}
975
}
976
if(pid == -1){
977
perror_plus("fork");
978
return false;
979
}
980
int status;
981
pid_t pret = -1;
982
errno = 0;
983
do {
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
991
}
992
if(kill(pid, SIGTERM) == -1){
993
perror_plus("kill");
994
}
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
997
" helper program");
998
}
999
return false;
1000
}
1001
} while(pret == -1 and errno == EINTR);
1002
if(pret == -1){
1003
perror_plus("waitpid");
1004
return false;
1005
}
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1010
return false;
1011
}
1012
return true;
1013
}
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1017
return false;
1018
}
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
return false;
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
}
1029
return add_delete_local_route(true, address, if_index);
1030
}
1031
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1035
if(debug){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
}
1038
return add_delete_local_route(false, address, if_index);
1039
}
1040
1041
506
/* Called when a Mandos server is found */
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
507
static int start_mandos_communication(const char *ip, uint16_t port,
1044
508
AvahiIfIndex if_index,
1045
int af, mandos_context *mc){
1046
int ret, tcp_sd = -1;
509
mandos_context *mc){
510
int ret, tcp_sd;
1047
511
ssize_t sret;
1048
struct sockaddr_storage to;
512
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1049
513
char *buffer = NULL;
1050
char *decrypted_buffer = NULL;
514
char *decrypted_buffer;
1051
515
size_t buffer_length = 0;
1052
516
size_t buffer_capacity = 0;
517
ssize_t decrypted_buffer_size;
1053
518
size_t written;
1054
int retval = -1;
519
int retval = 0;
520
char interface[IF_NAMESIZE];
1055
521
gnutls_session_t session;
1056
int pf; /* Protocol family */
1057
bool route_added = false;
1058
1059
errno = 0;
1060
1061
if(quit_now){
1062
errno = EINTR;
1063
return -1;
1064
}
1065
1066
switch(af){
1067
case AF_INET6:
1068
pf = PF_INET6;
1069
break;
1070
case AF_INET:
1071
pf = PF_INET;
1072
break;
1073
default:
1074
fprintf_plus(stderr, "Bad address family: %d\n", af);
1075
errno = EINVAL;
1076
return -1;
1077
}
1078
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1082
bool match = false;
1083
{
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
522
523
ret = init_gnutls_session(mc, &session);
1112
524
if(ret != 0){
1113
525
return -1;
1114
526
}
1115
527
1116
528
if(debug){
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
1119
}
1120
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1122
if(tcp_sd < 0){
1123
int e = errno;
1124
perror_plus("socket");
1125
errno = e;
1126
goto mandos_end;
1127
}
1128
1129
if(quit_now){
1130
errno = EINTR;
1131
goto mandos_end;
1132
}
1133
1134
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
1138
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
1142
}
529
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
530
"\n", ip, port);
531
}
532
533
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
534
if(tcp_sd < 0) {
535
perror("socket");
536
return -1;
537
}
538
539
if(debug){
540
if(if_indextoname((unsigned int)if_index, interface) == NULL){
541
perror("if_indextoname");
542
return -1;
543
}
544
fprintf(stderr, "Binding to interface %s\n", interface);
545
}
546
547
memset(&to, 0, sizeof(to));
548
to.in6.sin6_family = AF_INET6;
549
/* It would be nice to have a way to detect if we were passed an
550
IPv4 address here. Now we assume an IPv6 address. */
551
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1143
552
if(ret < 0 ){
1144
int e = errno;
1145
perror_plus("inet_pton");
1146
errno = e;
1147
goto mandos_end;
553
perror("inet_pton");
554
return -1;
1148
555
}
1149
556
if(ret == 0){
1150
int e = errno;
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
1152
errno = e;
1153
goto mandos_end;
1154
}
1155
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1159
if(if_index == AVAHI_IF_UNSPEC){
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
1162
errno = EINVAL;
1163
goto mandos_end;
1164
}
1165
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1167
}
1168
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
1170
}
557
fprintf(stderr, "Bad address: %s\n", ip);
558
return -1;
559
}
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
561
-Wconversion and
562
-Wunreachable-code */
1171
563
1172
if(quit_now){
1173
errno = EINTR;
1174
goto mandos_end;
1175
}
564
to.in6.sin6_scope_id = (uint32_t)if_index;
1176
565
1177
566
if(debug){
1178
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1179
char interface[IF_NAMESIZE];
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
perror_plus("if_indextoname");
1182
} else {
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
1185
}
1186
} else {
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
1189
}
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
567
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
568
port);
569
char addrstr[INET6_ADDRSTRLEN] = "";
570
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
571
sizeof(addrstr)) == NULL){
572
perror("inet_ntop");
573
} else {
574
if(strcmp(addrstr, ip) != 0){
575
fprintf(stderr, "Canonical address form: %s\n", addrstr);
576
}
577
}
578
}
579
580
ret = connect(tcp_sd, &to.in, sizeof(to));
581
if(ret < 0){
582
perror("connect");
583
return -1;
1272
584
}
1273
585
1274
586
const char *out = mandos_protocol_version;
1276
588
while(true){
1277
589
size_t out_size = strlen(out);
1278
590
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1279
out_size - written));
591
out_size - written));
1280
592
if(ret == -1){
1281
int e = errno;
1282
perror_plus("write");
1283
errno = e;
593
perror("write");
594
retval = -1;
1284
595
goto mandos_end;
1285
596
}
1286
597
written += (size_t)ret;
1294
605
break;
1295
606
}
1296
607
}
1297
1298
if(quit_now){
1299
errno = EINTR;
1300
goto mandos_end;
1301
}
1302
608
}
1303
609
1304
610
if(debug){
1305
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1306
}
1307
1308
if(quit_now){
1309
errno = EINTR;
1310
goto mandos_end;
1311
}
1312
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1318
1319
if(quit_now){
1320
errno = EINTR;
1321
goto mandos_end;
1322
}
1323
1324
do {
611
fprintf(stderr, "Establishing TLS session with %s\n", ip);
612
}
613
614
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
615
616
do{
1325
617
ret = gnutls_handshake(session);
1326
if(quit_now){
1327
errno = EINTR;
1328
goto mandos_end;
1329
}
1330
618
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1331
619
1332
620
if(ret != GNUTLS_E_SUCCESS){
1333
621
if(debug){
1334
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
622
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1335
623
gnutls_perror(ret);
1336
624
}
1337
errno = EPROTO;
625
retval = -1;
1338
626
goto mandos_end;
1339
627
}
1340
628
1341
629
/* Read OpenPGP packet that contains the wanted password */
1342
630
1343
631
if(debug){
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1345
" %s\n", ip);
632
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
633
ip);
1346
634
}
1347
635
1348
636
while(true){
1349
1350
if(quit_now){
1351
errno = EINTR;
1352
goto mandos_end;
1353
}
1354
1355
buffer_capacity = incbuffer(&buffer, buffer_length,
1356
buffer_capacity);
637
buffer_capacity = adjustbuffer(&buffer, buffer_length,
638
buffer_capacity);
1357
639
if(buffer_capacity == 0){
1358
int e = errno;
1359
perror_plus("incbuffer");
1360
errno = e;
1361
goto mandos_end;
1362
}
1363
1364
if(quit_now){
1365
errno = EINTR;
640
perror("adjustbuffer");
641
retval = -1;
1366
642
goto mandos_end;
1367
643
}
1368
644
1377
653
case GNUTLS_E_AGAIN:
1378
654
break;
1379
655
case GNUTLS_E_REHANDSHAKE:
1380
do {
656
do{
1381
657
ret = gnutls_handshake(session);
1382
1383
if(quit_now){
1384
errno = EINTR;
1385
goto mandos_end;
1386
}
1387
658
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1388
659
if(ret < 0){
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1390
"***\n");
660
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1391
661
gnutls_perror(ret);
1392
errno = EPROTO;
662
retval = -1;
1393
663
goto mandos_end;
1394
664
}
1395
665
break;
1396
666
default:
1397
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
667
fprintf(stderr, "Unknown error while reading data from"
668
" encrypted session with Mandos server\n");
669
retval = -1;
1399
670
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1400
errno = EIO;
1401
671
goto mandos_end;
1402
672
}
1403
673
} else {
1406
676
}
1407
677
1408
678
if(debug){
1409
fprintf_plus(stderr, "Closing TLS session\n");
1410
}
1411
1412
if(quit_now){
1413
errno = EINTR;
1414
goto mandos_end;
1415
}
1416
1417
do {
1418
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1419
if(quit_now){
1420
errno = EINTR;
1421
goto mandos_end;
1422
}
1423
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
679
fprintf(stderr, "Closing TLS session\n");
680
}
681
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1424
683
1425
684
if(buffer_length > 0){
1426
ssize_t decrypted_buffer_size;
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
686
buffer_length,
687
&decrypted_buffer);
1429
688
if(decrypted_buffer_size >= 0){
1430
1431
689
written = 0;
1432
690
while(written < (size_t) decrypted_buffer_size){
1433
if(quit_now){
1434
errno = EINTR;
1435
goto mandos_end;
1436
}
1437
1438
691
ret = (int)fwrite(decrypted_buffer + written, 1,
1439
692
(size_t)decrypted_buffer_size - written,
1440
693
stdout);
1441
694
if(ret == 0 and ferror(stdout)){
1442
int e = errno;
1443
695
if(debug){
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1445
strerror(errno));
696
fprintf(stderr, "Error writing encrypted data: %s\n",
697
strerror(errno));
1446
698
}
1447
errno = e;
1448
goto mandos_end;
699
retval = -1;
700
break;
1449
701
}
1450
702
written += (size_t)ret;
1451
703
}
1452
retval = 0;
704
free(decrypted_buffer);
705
} else {
706
retval = -1;
1453
707
}
708
} else {
709
retval = -1;
1454
710
}
1455
711
1456
712
/* Shutdown procedure */
1457
713
1458
714
mandos_end:
1459
{
1460
if(route_added){
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1464
}
1465
}
1466
int e = errno;
1467
free(decrypted_buffer);
1468
free(buffer);
1469
if(tcp_sd >= 0){
1470
ret = close(tcp_sd);
1471
}
1472
if(ret == -1){
1473
if(e == 0){
1474
e = errno;
1475
}
1476
perror_plus("close");
1477
}
1478
gnutls_deinit(session);
1479
errno = e;
1480
if(quit_now){
1481
errno = EINTR;
1482
retval = -1;
1483
}
715
free(buffer);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
717
if(ret == -1){
718
perror("close");
1484
719
}
720
gnutls_deinit(session);
1485
721
return retval;
1486
722
}
1487
723
1488
__attribute__((nonnull))
1489
724
static void resolve_callback(AvahiSServiceResolver *r,
1490
725
AvahiIfIndex interface,
1491
AvahiProtocol proto,
726
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1492
727
AvahiResolverEvent event,
1493
728
const char *name,
1494
729
const char *type,
1499
734
AVAHI_GCC_UNUSED AvahiStringList *txt,
1500
735
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1501
736
flags,
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
737
void* userdata) {
738
mandos_context *mc = userdata;
739
assert(r);
1506
740
1507
741
/* Called whenever a service has been resolved successfully or
1508
742
timed out */
1509
743
1510
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1512
return;
1513
}
1514
1515
switch(event){
744
switch(event) {
1516
745
default:
1517
746
case AVAHI_RESOLVER_FAILURE:
1518
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1519
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1520
domain,
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
747
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
748
" of type '%s' in domain '%s': %s\n", name, type, domain,
749
avahi_strerror(avahi_server_errno(mc->server)));
1523
750
break;
1524
751
1525
752
case AVAHI_RESOLVER_FOUND:
1527
754
char ip[AVAHI_ADDRESS_STR_MAX];
1528
755
avahi_address_snprint(ip, sizeof(ip), address);
1529
756
if(debug){
1530
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1531
PRIdMAX ") on port %" PRIu16 "\n", name,
1532
host_name, ip, (intmax_t)interface, port);
757
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
758
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
ip, (intmax_t)interface, port);
1533
760
}
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
761
int ret = start_mandos_communication(ip, port, interface, mc);
1538
762
if(ret == 0){
1539
avahi_simple_poll_quit(simple_poll);
1540
} else {
1541
if(not add_server(ip, (in_port_t)port, interface,
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1544
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1545
" list\n", name);
1546
}
763
avahi_simple_poll_quit(mc->simple_poll);
1547
764
}
1548
765
}
1549
766
}
1550
767
avahi_s_service_resolver_free(r);
1551
768
}
1552
769
1553
static void browse_callback(AvahiSServiceBrowser *b,
1554
AvahiIfIndex interface,
1555
AvahiProtocol protocol,
1556
AvahiBrowserEvent event,
1557
const char *name,
1558
const char *type,
1559
const char *domain,
1560
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1561
flags,
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
770
static void browse_callback( AvahiSServiceBrowser *b,
771
AvahiIfIndex interface,
772
AvahiProtocol protocol,
773
AvahiBrowserEvent event,
774
const char *name,
775
const char *type,
776
const char *domain,
777
AVAHI_GCC_UNUSED AvahiLookupResultFlags
778
flags,
779
void* userdata) {
780
mandos_context *mc = userdata;
781
assert(b);
1566
782
1567
783
/* Called whenever a new services becomes available on the LAN or
1568
784
is removed from the LAN */
1569
785
1570
if(quit_now){
1571
return;
1572
}
1573
1574
switch(event){
786
switch(event) {
1575
787
default:
1576
788
case AVAHI_BROWSER_FAILURE:
1577
789
1578
fprintf_plus(stderr, "(Avahi browser) %s\n",
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1581
avahi_simple_poll_quit(simple_poll);
790
fprintf(stderr, "(Avahi browser) %s\n",
791
avahi_strerror(avahi_server_errno(mc->server)));
792
avahi_simple_poll_quit(mc->simple_poll);
1582
793
return;
1583
794
1584
795
case AVAHI_BROWSER_NEW:
1587
798
the callback function is called the Avahi server will free the
1588
799
resolver for us. */
1589
800
1590
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1591
interface, protocol, name, type,
1592
domain, protocol, 0,
1593
resolve_callback, mc) == NULL)
1594
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1595
" %s\n", name,
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
802
protocol, name, type, domain,
803
AVAHI_PROTO_INET6, 0,
804
resolve_callback, mc)))
805
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
806
name, avahi_strerror(avahi_server_errno(mc->server)));
1598
807
break;
1599
808
1600
809
case AVAHI_BROWSER_REMOVE:
1603
812
case AVAHI_BROWSER_ALL_FOR_NOW:
1604
813
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1605
814
if(debug){
1606
fprintf_plus(stderr, "No Mandos server found, still"
1607
" searching...\n");
815
fprintf(stderr, "No Mandos server found, still searching...\n");
1608
816
}
1609
817
break;
1610
818
}
1611
819
}
1612
820
1613
/* Signal handler that stops main loop after SIGTERM */
1614
static void handle_sigterm(int sig){
1615
if(quit_now){
1616
return;
1617
}
1618
quit_now = 1;
1619
signal_received = sig;
1620
int old_errno = errno;
1621
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1624
}
1625
errno = old_errno;
1626
}
1627
1628
__attribute__((nonnull, warn_unused_result))
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
int ret;
1631
error_t ret_errno;
1632
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
if(s < 0){
1635
ret_errno = errno;
1636
perror_plus("socket");
1637
errno = ret_errno;
1638
return false;
1639
}
1640
strcpy(ifr->ifr_name, ifname);
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1642
if(ret == -1){
1643
if(debug){
1644
ret_errno = errno;
1645
perror_plus("ioctl SIOCGIFFLAGS");
1646
errno = ret_errno;
1647
}
1648
return false;
1649
}
1650
return true;
1651
}
1652
1653
__attribute__((nonnull, warn_unused_result))
1654
bool good_flags(const char *ifname, const struct ifreq *ifr){
1655
1656
/* Reject the loopback device */
1657
if(ifr->ifr_flags & IFF_LOOPBACK){
1658
if(debug){
1659
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1660
ifname);
1661
}
1662
return false;
1663
}
1664
/* Accept point-to-point devices only if connect_to is specified */
1665
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1666
if(debug){
1667
fprintf_plus(stderr, "Accepting point-to-point interface"
1668
" \"%s\"\n", ifname);
1669
}
1670
return true;
1671
}
1672
/* Otherwise, reject non-broadcast-capable devices */
1673
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1674
if(debug){
1675
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1676
" \"%s\"\n", ifname);
1677
}
1678
return false;
1679
}
1680
/* Reject non-ARP interfaces (including dummy interfaces) */
1681
if(ifr->ifr_flags & IFF_NOARP){
1682
if(debug){
1683
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1684
ifname);
1685
}
1686
return false;
1687
}
1688
1689
/* Accept this device */
1690
if(debug){
1691
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1692
}
1693
return true;
1694
}
1695
1696
/*
1697
* This function determines if a directory entry in /sys/class/net
1698
* corresponds to an acceptable network device.
1699
* (This function is passed to scandir(3) as a filter function.)
1700
*/
1701
__attribute__((nonnull, warn_unused_result))
1702
int good_interface(const struct dirent *if_entry){
1703
if(if_entry->d_name[0] == '.'){
1704
return 0;
1705
}
1706
1707
struct ifreq ifr;
1708
if(not get_flags(if_entry->d_name, &ifr)){
1709
if(debug){
1710
fprintf_plus(stderr, "Failed to get flags for interface "
1711
"\"%s\"\n", if_entry->d_name);
1712
}
1713
return 0;
1714
}
1715
1716
if(not good_flags(if_entry->d_name, &ifr)){
1717
return 0;
1718
}
1719
return 1;
1720
}
1721
1722
/*
1723
* This function determines if a network interface is up.
1724
*/
1725
__attribute__((nonnull, warn_unused_result))
1726
bool interface_is_up(const char *interface){
1727
struct ifreq ifr;
1728
if(not get_flags(interface, &ifr)){
1729
if(debug){
1730
fprintf_plus(stderr, "Failed to get flags for interface "
1731
"\"%s\"\n", interface);
1732
}
1733
return false;
1734
}
1735
1736
return (bool)(ifr.ifr_flags & IFF_UP);
1737
}
1738
1739
/*
1740
* This function determines if a network interface is running
1741
*/
1742
__attribute__((nonnull, warn_unused_result))
1743
bool interface_is_running(const char *interface){
1744
struct ifreq ifr;
1745
if(not get_flags(interface, &ifr)){
1746
if(debug){
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
}
1750
return false;
1751
}
1752
1753
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1754
}
1755
1756
__attribute__((nonnull, pure, warn_unused_result))
1757
int notdotentries(const struct dirent *direntry){
1758
/* Skip "." and ".." */
1759
if(direntry->d_name[0] == '.'
1760
and (direntry->d_name[1] == '\0'
1761
or (direntry->d_name[1] == '.'
1762
and direntry->d_name[2] == '\0'))){
1763
return 0;
1764
}
1765
return 1;
1766
}
1767
1768
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1770
int runnable_hook(const struct dirent *direntry){
1771
int ret;
1772
size_t sret;
1773
struct stat st;
1774
1775
if((direntry->d_name)[0] == '\0'){
1776
/* Empty name? */
1777
return 0;
1778
}
1779
1780
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1781
"abcdefghijklmnopqrstuvwxyz"
1782
"0123456789"
1783
"_.-");
1784
if((direntry->d_name)[sret] != '\0'){
1785
/* Contains non-allowed characters */
1786
if(debug){
1787
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1788
direntry->d_name);
1789
}
1790
return 0;
1791
}
1792
1793
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1794
if(ret == -1){
1795
if(debug){
1796
perror_plus("Could not stat hook");
1797
}
1798
return 0;
1799
}
1800
if(not (S_ISREG(st.st_mode))){
1801
/* Not a regular file */
1802
if(debug){
1803
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1804
direntry->d_name);
1805
}
1806
return 0;
1807
}
1808
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1809
/* Not executable */
1810
if(debug){
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1812
direntry->d_name);
1813
}
1814
return 0;
1815
}
1816
if(debug){
1817
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1818
direntry->d_name);
1819
}
1820
return 1;
1821
}
1822
1823
__attribute__((nonnull, warn_unused_result))
1824
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1825
mandos_context *mc){
1826
int ret;
1827
struct timespec now;
1828
struct timespec waited_time;
1829
intmax_t block_time;
1830
1831
while(true){
1832
if(mc->current_server == NULL){
1833
if(debug){
1834
fprintf_plus(stderr, "Wait until first server is found."
1835
" No timeout!\n");
1836
}
1837
ret = avahi_simple_poll_iterate(s, -1);
1838
} else {
1839
if(debug){
1840
fprintf_plus(stderr, "Check current_server if we should run"
1841
" it, or wait\n");
1842
}
1843
/* the current time */
1844
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1845
if(ret == -1){
1846
perror_plus("clock_gettime");
1847
return -1;
1848
}
1849
/* Calculating in ms how long time between now and server
1850
who we visted longest time ago. Now - last seen. */
1851
waited_time.tv_sec = (now.tv_sec
1852
- mc->current_server->last_seen.tv_sec);
1853
waited_time.tv_nsec = (now.tv_nsec
1854
- mc->current_server->last_seen.tv_nsec);
1855
/* total time is 10s/10,000ms.
1856
Converting to s from ms by dividing by 1,000,
1857
and ns to ms by dividing by 1,000,000. */
1858
block_time = ((retry_interval
1859
- ((intmax_t)waited_time.tv_sec * 1000))
1860
- ((intmax_t)waited_time.tv_nsec / 1000000));
1861
1862
if(debug){
1863
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1864
block_time);
1865
}
1866
1867
if(block_time <= 0){
1868
ret = start_mandos_communication(mc->current_server->ip,
1869
mc->current_server->port,
1870
mc->current_server->if_index,
1871
mc->current_server->af, mc);
1872
if(ret == 0){
1873
avahi_simple_poll_quit(s);
1874
return 0;
1875
}
1876
ret = clock_gettime(CLOCK_MONOTONIC,
1877
&mc->current_server->last_seen);
1878
if(ret == -1){
1879
perror_plus("clock_gettime");
1880
return -1;
1881
}
1882
mc->current_server = mc->current_server->next;
1883
block_time = 0; /* Call avahi to find new Mandos
1884
servers, but don't block */
1885
}
1886
1887
ret = avahi_simple_poll_iterate(s, (int)block_time);
1888
}
1889
if(ret != 0){
1890
if(ret > 0 or errno != EINTR){
1891
return (ret != 1) ? ret : 0;
1892
}
1893
}
1894
}
1895
}
1896
1897
__attribute__((nonnull))
1898
void run_network_hooks(const char *mode, const char *interface,
1899
const float delay){
1900
struct dirent **direntries = NULL;
1901
if(hookdir_fd == -1){
1902
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1903
| O_CLOEXEC);
1904
if(hookdir_fd == -1){
1905
if(errno == ENOENT){
1906
if(debug){
1907
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1908
" found\n", hookdir);
1909
}
1910
} else {
1911
perror_plus("open");
1912
}
1913
return;
1914
}
1915
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1919
runnable_hook, alphasort);
1920
#else /* not __GLIBC_PREREQ(2, 15) */
1921
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1922
alphasort);
1923
#endif /* not __GLIBC_PREREQ(2, 15) */
1924
#else /* not __GLIBC__ */
1925
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1926
alphasort);
1927
#endif /* not __GLIBC__ */
1928
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1944
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1991
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1996
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
2065
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
2085
}
2086
2087
__attribute__((nonnull, warn_unused_result))
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2091
int ret;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2094
if(if_index == 0){
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2096
errno = old_errno;
2097
return ENXIO;
2098
}
2099
2100
if(quit_now){
2101
errno = old_errno;
2102
return EINTR;
2103
}
2104
2105
if(not interface_is_up(interface)){
2106
error_t ret_errno = 0, ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
2108
ret_errno = errno;
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2110
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
return ret_errno;
2113
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
2115
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
2118
ret_errno = errno;
2119
perror_plus("socket");
2120
errno = old_errno;
2121
return ret_errno;
2122
}
2123
2124
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
2129
errno = old_errno;
2130
return EINTR;
2131
}
2132
2133
if(debug){
2134
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2135
interface);
2136
}
2137
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
2144
2145
#ifdef __linux__
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
2157
}
2158
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
2161
#ifdef __linux__
2162
if(restore_loglevel){
2163
ret_linux = klogctl(7, NULL, 0);
2164
if(ret_linux == -1){
2165
perror_plus("klogctl");
2166
}
2167
}
2168
#endif /* __linux__ */
2169
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
2179
2180
/* Close the socket */
2181
ret = close(sd);
2182
if(ret == -1){
2183
perror_plus("close");
2184
}
2185
2186
if(ret_setflags == -1){
2187
errno = ioctl_errno;
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
errno = old_errno;
2190
return ioctl_errno;
2191
}
2192
} else if(debug){
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2194
interface);
2195
}
2196
2197
/* Sleep checking until interface is running.
2198
Check every 0.25s, up to total time of delay */
2199
for(int i=0; i < delay * 4; i++){
2200
if(interface_is_running(interface)){
2201
break;
2202
}
2203
struct timespec sleeptime = { .tv_nsec = 250000000 };
2204
ret = nanosleep(&sleeptime, NULL);
2205
if(ret == -1 and errno != EINTR){
2206
perror_plus("nanosleep");
2207
}
2208
}
2209
2210
errno = old_errno;
2211
return 0;
2212
}
2213
2214
__attribute__((nonnull, warn_unused_result))
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2217
struct ifreq network;
2218
unsigned int if_index = if_nametoindex(interface);
2219
if(if_index == 0){
2220
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2221
errno = old_errno;
2222
return ENXIO;
2223
}
2224
if(interface_is_up(interface)){
2225
error_t ret_errno = 0, ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2227
ret_errno = errno;
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
return ret_errno;
2232
}
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
2237
ret_errno = errno;
2238
perror_plus("socket");
2239
errno = old_errno;
2240
return ret_errno;
2241
}
2242
2243
if(debug){
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2245
interface);
2246
}
2247
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
2254
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
int ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2282
interface);
2283
}
2284
2285
errno = old_errno;
2286
return 0;
2287
}
2288
2289
821
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
2295
AvahiSServiceBrowser *sb = NULL;
2296
error_t ret_errno;
2297
int ret;
2298
intmax_t tmpmax;
2299
char *tmp;
2300
int exitcode = EXIT_SUCCESS;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
2306
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2307
const char *seckey = PATHDIR "/" SECKEY;
2308
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
2311
2312
bool gnutls_initialized = false;
2313
bool gpgme_initialized = false;
2314
float delay = 2.5f;
2315
double retry_interval = 10; /* 10s between trying a server and
2316
retrying the same server again */
2317
2318
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2319
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2320
2321
uid = getuid();
2322
gid = getgid();
2323
2324
/* Lower any group privileges we might have, just to be safe */
2325
errno = 0;
2326
ret = setgid(gid);
2327
if(ret == -1){
2328
perror_plus("setgid");
2329
}
2330
2331
/* Lower user privileges (temporarily) */
2332
errno = 0;
2333
ret = seteuid(uid);
2334
if(ret == -1){
2335
perror_plus("seteuid");
2336
}
2337
2338
if(quit_now){
2339
goto end;
2340
}
2341
2342
{
2343
struct argp_option options[] = {
2344
{ .name = "debug", .key = 128,
2345
.doc = "Debug mode", .group = 3 },
2346
{ .name = "connect", .key = 'c',
2347
.arg = "ADDRESS:PORT",
2348
.doc = "Connect directly to a specific Mandos server",
2349
.group = 1 },
2350
{ .name = "interface", .key = 'i',
2351
.arg = "NAME",
2352
.doc = "Network interface that will be used to search for"
2353
" Mandos servers",
2354
.group = 1 },
2355
{ .name = "seckey", .key = 's',
2356
.arg = "FILE",
2357
.doc = "OpenPGP secret key file base name",
2358
.group = 1 },
2359
{ .name = "pubkey", .key = 'p',
2360
.arg = "FILE",
2361
.doc = "OpenPGP public key file base name",
2362
.group = 2 },
2363
{ .name = "dh-bits", .key = 129,
2364
.arg = "BITS",
2365
.doc = "Bit length of the prime number used in the"
2366
" Diffie-Hellman key exchange",
2367
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
2373
{ .name = "priority", .key = 130,
2374
.arg = "STRING",
2375
.doc = "GnuTLS priority string for the TLS handshake",
2376
.group = 1 },
2377
{ .name = "delay", .key = 131,
2378
.arg = "SECONDS",
2379
.doc = "Maximum delay to wait for interface startup",
2380
.group = 2 },
2381
{ .name = "retry", .key = 132,
2382
.arg = "SECONDS",
2383
.doc = "Retry interval used when denied by the Mandos server",
2384
.group = 2 },
2385
{ .name = "network-hook-dir", .key = 133,
2386
.arg = "DIR",
2387
.doc = "Directory where network hooks are located",
2388
.group = 2 },
2389
/*
2390
* These reproduce what we would get without ARGP_NO_HELP
2391
*/
2392
{ .name = "help", .key = '?',
2393
.doc = "Give this help list", .group = -1 },
2394
{ .name = "usage", .key = -3,
2395
.doc = "Give a short usage message", .group = -1 },
2396
{ .name = "version", .key = 'V',
2397
.doc = "Print program version", .group = -1 },
2398
{ .name = NULL }
2399
};
2400
2401
error_t parse_opt(int key, char *arg,
2402
struct argp_state *state){
2403
errno = 0;
2404
switch(key){
2405
case 128: /* --debug */
2406
debug = true;
2407
break;
2408
case 'c': /* --connect */
2409
connect_to = arg;
2410
break;
2411
case 'i': /* --interface */
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
2414
if(ret_errno != 0){
2415
argp_error(state, "%s", strerror(ret_errno));
2416
}
2417
break;
2418
case 's': /* --seckey */
2419
seckey = arg;
2420
break;
2421
case 'p': /* --pubkey */
2422
pubkey = arg;
2423
break;
2424
case 129: /* --dh-bits */
2425
errno = 0;
2426
tmpmax = strtoimax(arg, &tmp, 10);
2427
if(errno != 0 or tmp == arg or *tmp != '\0'
2428
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2429
argp_error(state, "Bad number of DH bits");
2430
}
2431
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2432
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
2436
case 130: /* --priority */
2437
mc.priority = arg;
2438
break;
2439
case 131: /* --delay */
2440
errno = 0;
2441
delay = strtof(arg, &tmp);
2442
if(errno != 0 or tmp == arg or *tmp != '\0'){
2443
argp_error(state, "Bad delay");
2444
}
2445
case 132: /* --retry */
2446
errno = 0;
2447
retry_interval = strtod(arg, &tmp);
2448
if(errno != 0 or tmp == arg or *tmp != '\0'
2449
or (retry_interval * 1000) > INT_MAX
2450
or retry_interval < 0){
2451
argp_error(state, "Bad retry interval");
2452
}
2453
break;
2454
case 133: /* --network-hook-dir */
2455
hookdir = arg;
2456
break;
2457
/*
2458
* These reproduce what we would get without ARGP_NO_HELP
2459
*/
2460
case '?': /* --help */
2461
argp_state_help(state, state->out_stream,
2462
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2463
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2464
case -3: /* --usage */
2465
argp_state_help(state, state->out_stream,
2466
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2467
case 'V': /* --version */
2468
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2469
exit(argp_err_exit_status);
2470
break;
2471
default:
2472
return ARGP_ERR_UNKNOWN;
2473
}
2474
return errno;
2475
}
2476
2477
struct argp argp = { .options = options, .parser = parse_opt,
2478
.args_doc = "",
2479
.doc = "Mandos client -- Get and decrypt"
2480
" passwords from a Mandos server" };
2481
ret = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret){
2484
case 0:
2485
break;
2486
case ENOMEM:
2487
default:
2488
errno = ret;
2489
perror_plus("argp_parse");
2490
exitcode = EX_OSERR;
2491
goto end;
2492
case EINVAL:
2493
exitcode = EX_USAGE;
2494
goto end;
2495
}
2496
}
2497
2498
{
2499
/* Work around Debian bug #633582:
2500
<http://bugs.debian.org/633582> */
2501
2502
/* Re-raise privileges */
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2506
perror_plus("Failed to raise privileges");
2507
} else {
2508
struct stat st;
2509
2510
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2511
int seckey_fd = open(seckey, O_RDONLY);
2512
if(seckey_fd == -1){
2513
perror_plus("open");
2514
} else {
2515
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2516
if(ret == -1){
2517
perror_plus("fstat");
2518
} else {
2519
if(S_ISREG(st.st_mode)
2520
and st.st_uid == 0 and st.st_gid == 0){
2521
ret = fchown(seckey_fd, uid, gid);
2522
if(ret == -1){
2523
perror_plus("fchown");
2524
}
2525
}
2526
}
2527
close(seckey_fd);
2528
}
2529
}
2530
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
int pubkey_fd = open(pubkey, O_RDONLY);
2533
if(pubkey_fd == -1){
2534
perror_plus("open");
2535
} else {
2536
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2537
if(ret == -1){
2538
perror_plus("fstat");
2539
} else {
2540
if(S_ISREG(st.st_mode)
2541
and st.st_uid == 0 and st.st_gid == 0){
2542
ret = fchown(pubkey_fd, uid, gid);
2543
if(ret == -1){
2544
perror_plus("fchown");
2545
}
2546
}
2547
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
2574
/* Lower privileges */
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to lower privileges");
2579
}
2580
}
2581
}
2582
2583
/* Remove invalid interface names (except "none") */
2584
{
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2593
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2595
interface = NULL;
2596
}
2597
}
2598
}
2599
2600
/* Run network hooks */
2601
{
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
2606
goto end;
2607
}
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
2613
}
2614
2615
if(not debug){
2616
avahi_set_log_function(empty_log);
2617
}
2618
2619
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2620
from the signal handler */
2621
/* Initialize the pseudo-RNG for Avahi */
2622
srand((unsigned int) time(NULL));
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
2625
fprintf_plus(stderr,
2626
"Avahi: Failed to create simple poll object.\n");
2627
exitcode = EX_UNAVAILABLE;
2628
goto end;
2629
}
2630
2631
sigemptyset(&sigterm_action.sa_mask);
2632
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2633
if(ret == -1){
2634
perror_plus("sigaddset");
2635
exitcode = EX_OSERR;
2636
goto end;
2637
}
2638
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2639
if(ret == -1){
2640
perror_plus("sigaddset");
2641
exitcode = EX_OSERR;
2642
goto end;
2643
}
2644
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2645
if(ret == -1){
2646
perror_plus("sigaddset");
2647
exitcode = EX_OSERR;
2648
goto end;
2649
}
2650
/* Need to check if the handler is SIG_IGN before handling:
2651
| [[info:libc:Initial Signal Actions]] |
2652
| [[info:libc:Basic Signal Handling]] |
2653
*/
2654
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2655
if(ret == -1){
2656
perror_plus("sigaction");
2657
return EX_OSERR;
2658
}
2659
if(old_sigterm_action.sa_handler != SIG_IGN){
2660
ret = sigaction(SIGINT, &sigterm_action, NULL);
2661
if(ret == -1){
2662
perror_plus("sigaction");
2663
exitcode = EX_OSERR;
2664
goto end;
2665
}
2666
}
2667
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2668
if(ret == -1){
2669
perror_plus("sigaction");
2670
return EX_OSERR;
2671
}
2672
if(old_sigterm_action.sa_handler != SIG_IGN){
2673
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2674
if(ret == -1){
2675
perror_plus("sigaction");
2676
exitcode = EX_OSERR;
2677
goto end;
2678
}
2679
}
2680
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2681
if(ret == -1){
2682
perror_plus("sigaction");
2683
return EX_OSERR;
2684
}
2685
if(old_sigterm_action.sa_handler != SIG_IGN){
2686
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2687
if(ret == -1){
2688
perror_plus("sigaction");
2689
exitcode = EX_OSERR;
2690
goto end;
2691
}
2692
}
2693
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2699
alphasort);
2700
if(ret >= 1){
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2705
if(ret_errno != 0){
2706
errno = ret_errno;
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2709
continue;
2710
}
2711
if(debug){
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2714
}
2715
free(direntries[i]);
2716
}
2717
free(direntries);
2718
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2723
exitcode = EXIT_FAILURE;
2724
goto end;
2725
}
2726
}
2727
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
}
2746
}
2747
break;
2748
}
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2755
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2762
}
2763
}
2764
}
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
}
2768
}
2769
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
822
AvahiSServiceBrowser *sb = NULL;
823
int error;
824
int ret;
825
intmax_t tmpmax;
826
int numchars;
827
int exitcode = EXIT_SUCCESS;
828
const char *interface = "eth0";
829
struct ifreq network;
830
int sd;
831
uid_t uid;
832
gid_t gid;
833
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
836
const char *seckey = PATHDIR "/" SECKEY;
837
const char *pubkey = PATHDIR "/" PUBKEY;
838
839
mandos_context mc = { .simple_poll = NULL, .server = NULL,
840
.dh_bits = 1024, .priority = "SECURE256"
841
":!CTYPE-X.509:+CTYPE-OPENPGP" };
842
bool gnutls_initialized = false;
843
bool gpgme_initialized = false;
844
845
{
846
struct argp_option options[] = {
847
{ .name = "debug", .key = 128,
848
.doc = "Debug mode", .group = 3 },
849
{ .name = "connect", .key = 'c',
850
.arg = "ADDRESS:PORT",
851
.doc = "Connect directly to a specific Mandos server",
852
.group = 1 },
853
{ .name = "interface", .key = 'i',
854
.arg = "NAME",
855
.doc = "Interface that will be used to search for Mandos"
856
" servers",
857
.group = 1 },
858
{ .name = "seckey", .key = 's',
859
.arg = "FILE",
860
.doc = "OpenPGP secret key file base name",
861
.group = 1 },
862
{ .name = "pubkey", .key = 'p',
863
.arg = "FILE",
864
.doc = "OpenPGP public key file base name",
865
.group = 2 },
866
{ .name = "dh-bits", .key = 129,
867
.arg = "BITS",
868
.doc = "Bit length of the prime number used in the"
869
" Diffie-Hellman key exchange",
870
.group = 2 },
871
{ .name = "priority", .key = 130,
872
.arg = "STRING",
873
.doc = "GnuTLS priority string for the TLS handshake",
874
.group = 1 },
875
{ .name = NULL }
876
};
877
878
error_t parse_opt(int key, char *arg,
879
struct argp_state *state) {
880
switch(key) {
881
case 128: /* --debug */
882
debug = true;
883
break;
884
case 'c': /* --connect */
885
connect_to = arg;
886
break;
887
case 'i': /* --interface */
888
interface = arg;
889
break;
890
case 's': /* --seckey */
891
seckey = arg;
892
break;
893
case 'p': /* --pubkey */
894
pubkey = arg;
895
break;
896
case 129: /* --dh-bits */
897
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
898
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
899
or arg[numchars] != '\0'){
900
fprintf(stderr, "Bad number of DH bits\n");
901
exit(EXIT_FAILURE);
902
}
903
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
904
break;
905
case 130: /* --priority */
906
mc.priority = arg;
907
break;
908
case ARGP_KEY_ARG:
909
argp_usage(state);
910
case ARGP_KEY_END:
911
break;
912
default:
913
return ARGP_ERR_UNKNOWN;
914
}
915
return 0;
916
}
917
918
struct argp argp = { .options = options, .parser = parse_opt,
919
.args_doc = "",
920
.doc = "Mandos client -- Get and decrypt"
921
" passwords from a Mandos server" };
922
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
923
if(ret == ARGP_ERR_UNKNOWN){
924
fprintf(stderr, "Unknown error while parsing arguments\n");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
}
929
930
/* If the interface is down, bring it up */
931
{
932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
933
if(sd < 0) {
934
perror("socket");
935
exitcode = EXIT_FAILURE;
936
goto end;
937
}
938
strcpy(network.ifr_name, interface);
939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCGIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
if((network.ifr_flags & IFF_UP) == 0){
946
network.ifr_flags |= IFF_UP;
947
ret = ioctl(sd, SIOCSIFFLAGS, &network);
948
if(ret == -1){
949
perror("ioctl SIOCSIFFLAGS");
950
exitcode = EXIT_FAILURE;
951
goto end;
952
}
953
}
954
ret = (int)TEMP_FAILURE_RETRY(close(sd));
955
if(ret == -1){
956
perror("close");
957
}
958
}
959
960
uid = getuid();
961
gid = getgid();
962
963
ret = setuid(uid);
964
if(ret == -1){
965
perror("setuid");
966
}
967
968
setgid(gid);
969
if(ret == -1){
970
perror("setgid");
971
}
972
973
ret = init_gnutls_global(&mc, pubkey, seckey);
974
if(ret == -1){
975
fprintf(stderr, "init_gnutls_global failed\n");
976
exitcode = EXIT_FAILURE;
977
goto end;
978
} else {
979
gnutls_initialized = true;
980
}
981
982
if(mkdtemp(tempdir) == NULL){
983
perror("mkdtemp");
984
tempdir[0] = '\0';
985
goto end;
986
}
987
988
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
989
fprintf(stderr, "init_gpgme failed\n");
990
exitcode = EXIT_FAILURE;
991
goto end;
992
} else {
993
gpgme_initialized = true;
994
}
995
996
if_index = (AvahiIfIndex) if_nametoindex(interface);
997
if(if_index == 0){
998
fprintf(stderr, "No such interface: \"%s\"\n", interface);
999
exit(EXIT_FAILURE);
1000
}
1001
1002
if(connect_to != NULL){
1003
/* Connect directly, do not use Zeroconf */
1004
/* (Mainly meant for debugging) */
1005
char *address = strrchr(connect_to, ':');
1006
if(address == NULL){
1007
fprintf(stderr, "No colon in address\n");
1008
exitcode = EXIT_FAILURE;
1009
goto end;
1010
}
1011
uint16_t port;
1012
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1013
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1014
or address[numchars+1] != '\0'){
1015
fprintf(stderr, "Bad port number\n");
1016
exitcode = EXIT_FAILURE;
1017
goto end;
1018
}
1019
port = (uint16_t)tmpmax;
1020
*address = '\0';
1021
address = connect_to;
1022
ret = start_mandos_communication(address, port, if_index, &mc);
1023
if(ret < 0){
1024
exitcode = EXIT_FAILURE;
1025
} else {
1026
exitcode = EXIT_SUCCESS;
1027
}
1028
goto end;
1029
}
1030
1031
if(not debug){
1032
avahi_set_log_function(empty_log);
1033
}
1034
1035
/* Initialize the pseudo-RNG for Avahi */
1036
srand((unsigned int) time(NULL));
1037
1038
/* Allocate main Avahi loop object */
1039
mc.simple_poll = avahi_simple_poll_new();
1040
if(mc.simple_poll == NULL) {
1041
fprintf(stderr, "Avahi: Failed to create simple poll"
1042
" object.\n");
1043
exitcode = EXIT_FAILURE;
1044
goto end;
1045
}
1046
1047
{
1048
AvahiServerConfig config;
1049
/* Do not publish any local Zeroconf records */
1050
avahi_server_config_init(&config);
1051
config.publish_hinfo = 0;
1052
config.publish_addresses = 0;
1053
config.publish_workstation = 0;
1054
config.publish_domain = 0;
1055
1056
/* Allocate a new server */
1057
mc.server = avahi_server_new(avahi_simple_poll_get
1058
(mc.simple_poll), &config, NULL,
1059
NULL, &error);
1060
1061
/* Free the Avahi configuration data */
1062
avahi_server_config_free(&config);
1063
}
1064
1065
/* Check if creating the Avahi server object succeeded */
1066
if(mc.server == NULL) {
1067
fprintf(stderr, "Failed to create Avahi server: %s\n",
1068
avahi_strerror(error));
1069
exitcode = EXIT_FAILURE;
1070
goto end;
1071
}
1072
1073
/* Create the Avahi service browser */
1074
sb = avahi_s_service_browser_new(mc.server, if_index,
1075
AVAHI_PROTO_INET6,
1076
"_mandos._tcp", NULL, 0,
1077
browse_callback, &mc);
1078
if(sb == NULL) {
1079
fprintf(stderr, "Failed to create service browser: %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
1084
1085
/* Run the main loop */
1086
2772
1087
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2777
}
2778
2779
if(quit_now){
2780
goto end;
2781
}
2782
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2784
if(ret == -1){
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
2786
exitcode = EX_UNAVAILABLE;
2787
goto end;
2788
} else {
2789
gnutls_initialized = true;
2790
}
2791
2792
if(quit_now){
2793
goto end;
2794
}
2795
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
2806
perror_plus("mkdtemp");
2807
goto end;
2808
}
2809
2810
if(quit_now){
2811
goto end;
2812
}
2813
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2815
fprintf_plus(stderr, "init_gpgme failed\n");
2816
exitcode = EX_UNAVAILABLE;
2817
goto end;
2818
} else {
2819
gpgme_initialized = true;
2820
}
2821
2822
if(quit_now){
2823
goto end;
2824
}
2825
2826
if(connect_to != NULL){
2827
/* Connect directly, do not use Zeroconf */
2828
/* (Mainly meant for debugging) */
2829
char *address = strrchr(connect_to, ':');
2830
2831
if(address == NULL){
2832
fprintf_plus(stderr, "No colon in address\n");
2833
exitcode = EX_USAGE;
2834
goto end;
2835
}
2836
2837
if(quit_now){
2838
goto end;
2839
}
2840
2841
in_port_t port;
2842
errno = 0;
2843
tmpmax = strtoimax(address+1, &tmp, 10);
2844
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2845
or tmpmax != (in_port_t)tmpmax){
2846
fprintf_plus(stderr, "Bad port number\n");
2847
exitcode = EX_USAGE;
2848
goto end;
2849
}
2850
2851
if(quit_now){
2852
goto end;
2853
}
2854
2855
port = (in_port_t)tmpmax;
2856
*address = '\0';
2857
/* Colon in address indicates IPv6 */
2858
int af;
2859
if(strchr(connect_to, ':') != NULL){
2860
af = AF_INET6;
2861
/* Accept [] around IPv6 address - see RFC 5952 */
2862
if(connect_to[0] == '[' and address[-1] == ']')
2863
{
2864
connect_to++;
2865
address[-1] = '\0';
2866
}
2867
} else {
2868
af = AF_INET;
2869
}
2870
address = connect_to;
2871
2872
if(quit_now){
2873
goto end;
2874
}
2875
2876
while(not quit_now){
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2879
if(quit_now or ret == 0){
2880
break;
2881
}
2882
if(debug){
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2884
(int)retry_interval);
2885
}
2886
sleep((unsigned int)retry_interval);
2887
}
2888
2889
if(not quit_now){
2890
exitcode = EXIT_SUCCESS;
2891
}
2892
2893
goto end;
2894
}
2895
2896
if(quit_now){
2897
goto end;
2898
}
2899
2900
{
2901
AvahiServerConfig config;
2902
/* Do not publish any local Zeroconf records */
2903
avahi_server_config_init(&config);
2904
config.publish_hinfo = 0;
2905
config.publish_addresses = 0;
2906
config.publish_workstation = 0;
2907
config.publish_domain = 0;
2908
2909
/* Allocate a new server */
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret_errno);
2912
2913
/* Free the Avahi configuration data */
2914
avahi_server_config_free(&config);
2915
}
2916
2917
/* Check if creating the Avahi server object succeeded */
2918
if(mc.server == NULL){
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret_errno));
2921
exitcode = EX_UNAVAILABLE;
2922
goto end;
2923
}
2924
2925
if(quit_now){
2926
goto end;
2927
}
2928
2929
/* Create the Avahi service browser */
2930
sb = avahi_s_service_browser_new(mc.server, if_index,
2931
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
2934
if(sb == NULL){
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2936
avahi_strerror(avahi_server_errno(mc.server)));
2937
exitcode = EX_UNAVAILABLE;
2938
goto end;
2939
}
2940
2941
if(quit_now){
2942
goto end;
2943
}
2944
2945
/* Run the main loop */
2946
2947
if(debug){
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
2949
}
2950
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2953
if(debug){
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
(ret == 0) ? "successfully" : "with error");
2956
}
2957
1088
fprintf(stderr, "Starting Avahi loop search\n");
1089
}
1090
1091
avahi_simple_poll_loop(mc.simple_poll);
1092
2958
1093
end:
2959
2960
if(debug){
2961
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2962
}
2963
2964
/* Cleanup things */
2965
free(mc.interfaces);
2966
2967
if(sb != NULL)
2968
avahi_s_service_browser_free(sb);
2969
2970
if(mc.server != NULL)
2971
avahi_server_free(mc.server);
2972
2973
if(simple_poll != NULL)
2974
avahi_simple_poll_free(simple_poll);
2975
2976
if(gnutls_initialized){
2977
gnutls_certificate_free_credentials(mc.cred);
2978
gnutls_global_deinit();
2979
gnutls_dh_params_deinit(mc.dh_params);
2980
}
2981
2982
if(gpgme_initialized){
2983
gpgme_release(mc.ctx);
2984
}
2985
2986
/* Cleans up the circular linked list of Mandos servers the client
2987
has seen */
2988
if(mc.current_server != NULL){
2989
mc.current_server->prev->next = NULL;
2990
while(mc.current_server != NULL){
2991
server *next = mc.current_server->next;
2992
#ifdef __GNUC__
2993
#pragma GCC diagnostic push
2994
#pragma GCC diagnostic ignored "-Wcast-qual"
2995
#endif
2996
free((char *)(mc.current_server->ip));
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic pop
2999
#endif
3000
free(mc.current_server);
3001
mc.current_server = next;
3002
}
3003
}
3004
3005
/* Re-raise privileges */
3006
{
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3010
perror_plus("Failed to raise privileges");
3011
} else {
3012
3013
/* Run network hooks */
3014
run_network_hooks("stop", interfaces_hooks != NULL ?
3015
interfaces_hooks : "", delay);
3016
3017
/* Take down the network interfaces which were brought up */
3018
{
3019
char *interface = NULL;
3020
while((interface=argz_next(interfaces_to_take_down,
3021
interfaces_to_take_down_size,
3022
interface))){
3023
ret_errno = take_down_interface(interface);
3024
if(ret_errno != 0){
3025
errno = ret_errno;
3026
perror_plus("Failed to take down interface");
3027
}
3028
}
3029
if(debug and (interfaces_to_take_down == NULL)){
3030
fprintf_plus(stderr, "No interfaces needed to be taken"
3031
" down\n");
3032
}
3033
}
3034
}
3035
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3039
perror_plus("Failed to lower privileges permanently");
3040
}
3041
}
3042
3043
free(interfaces_to_take_down);
3044
free(interfaces_hooks);
3045
3046
/* Removes the GPGME temp directory and all files inside */
3047
if(tempdir != NULL){
3048
struct dirent **direntries = NULL;
3049
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(tempdir_fd == -1){
3054
perror_plus("open");
3055
} else {
3056
#ifdef __GLIBC__
3057
#if __GLIBC_PREREQ(2, 15)
3058
int numentries = scandirat(tempdir_fd, ".", &direntries,
3059
notdotentries, alphasort);
3060
#else /* not __GLIBC_PREREQ(2, 15) */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC_PREREQ(2, 15) */
3064
#else /* not __GLIBC__ */
3065
int numentries = scandir(tempdir, &direntries, notdotentries,
3066
alphasort);
3067
#endif /* not __GLIBC__ */
3068
if(numentries >= 0){
3069
for(int i = 0; i < numentries; i++){
3070
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
1094
1095
if(debug){
1096
fprintf(stderr, "%s exiting\n", argv[0]);
1097
}
1098
1099
/* Cleanup things */
1100
if(sb != NULL)
1101
avahi_s_service_browser_free(sb);
1102
1103
if(mc.server != NULL)
1104
avahi_server_free(mc.server);
1105
1106
if(mc.simple_poll != NULL)
1107
avahi_simple_poll_free(mc.simple_poll);
1108
1109
if(gnutls_initialized){
1110
gnutls_certificate_free_credentials(mc.cred);
1111
gnutls_global_deinit();
1112
gnutls_dh_params_deinit(mc.dh_params);
1113
}
1114
1115
if(gpgme_initialized){
1116
gpgme_release(mc.ctx);
1117
}
1118
1119
/* Removes the temp directory used by GPGME */
1120
if(tempdir[0] != '\0'){
1121
DIR *d;
1122
struct dirent *direntry;
1123
d = opendir(tempdir);
1124
if(d == NULL){
1125
if(errno != ENOENT){
1126
perror("opendir");
1127
}
1128
} else {
1129
while(true){
1130
direntry = readdir(d);
1131
if(direntry == NULL){
1132
break;
1133
}
1134
/* Skip "." and ".." */
1135
if(direntry->d_name[0] == '.'
1136
and (direntry->d_name[1] == '\0'
1137
or (direntry->d_name[1] == '.'
1138
and direntry->d_name[2] == '\0'))){
1139
continue;
1140
}
1141
char *fullname = NULL;
1142
ret = asprintf(&fullname, "%s/%s", tempdir,
1143
direntry->d_name);
1144
if(ret < 0){
1145
perror("asprintf");
1146
continue;
1147
}
1148
ret = remove(fullname);
3071
1149
if(ret == -1){
3072
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3073
" \"%s\", 0): %s\n", tempdir,
3074
direntries[i]->d_name, strerror(errno));
1150
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1151
strerror(errno));
3075
1152
}
3076
free(direntries[i]);
3077
}
3078
3079
/* need to clean even if 0 because man page doesn't specify */
3080
free(direntries);
3081
if(numentries == -1){
3082
perror_plus("scandir");
3083
}
3084
ret = rmdir(tempdir);
3085
if(ret == -1 and errno != ENOENT){
3086
perror_plus("rmdir");
3087
}
3088
}
3089
close(tempdir_fd);
3090
}
3091
}
3092
3093
if(quit_now){
3094
sigemptyset(&old_sigterm_action.sa_mask);
3095
old_sigterm_action.sa_handler = SIG_DFL;
3096
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3097
&old_sigterm_action,
3098
NULL));
3099
if(ret == -1){
3100
perror_plus("sigaction");
3101
}
3102
do {
3103
ret = raise(signal_received);
3104
} while(ret != 0 and errno == EINTR);
3105
if(ret != 0){
3106
perror_plus("raise");
3107
abort();
3108
}
3109
TEMP_FAILURE_RETRY(pause());
3110
}
3111
3112
return exitcode;
1153
free(fullname);
1154
}
1155
closedir(d);
1156
}
1157
ret = rmdir(tempdir);
1158
if(ret == -1 and errno != ENOENT){
1159
perror("rmdir");
1160
}
1161
}
1162
1163
return exitcode;
3113
1164
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0