To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 711
- compare with another revision
- download diff
- download tarball
- view history from revision 711
- Committer: Teddy Hogeborn
- Date: 2014-07-13 21:55:28 UTC
- mfrom: (237.4.49 release)
- Revision ID: teddy@recompile.se-20140713215528-5lez8qv009g0i1h2
Merge from release branch.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- files renamed:
- mandos-list => mandos-ctl
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf */
40
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
48
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
53
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
54
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton(),
56
connect() */
57
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
62
*/
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
61
#include <assert.h> /* assert() */
62
#include <errno.h> /* perror(), errno */
63
#include <time.h> /* time() */
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() */
64
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
69
SIOCSIFFLAGS, if_indextoname(),
66
70
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
getuid(), getgid(), setuid(),
70
setgid() */
71
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
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 */
73
80
#include <argp.h> /* struct argp_option, error_t, struct
74
81
argp_state, struct argp,
75
82
argp_parse(), ARGP_KEY_ARG,
76
83
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__ */
77
102
78
103
/* Avahi */
79
104
/* All Avahi types, constants and functions
93
118
init_gnutls_session(),
94
119
GNUTLS_* */
95
120
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
97
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
98
123
99
124
/* GPGME */
100
125
#include <gpgme.h> /* All GPGME types, constants and
108
133
#define PATHDIR "/conf/conf.d/mandos"
109
134
#define SECKEY "seckey.txt"
110
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
111
137
112
138
bool debug = false;
113
139
static const char mandos_protocol_version[] = "1";
114
140
const char *argp_program_version = "mandos-client " VERSION;
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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
159
117
160
/* Used for passing in values through the Avahi callback functions */
118
161
typedef struct {
119
AvahiSimplePoll *simple_poll;
120
162
AvahiServer *server;
121
163
gnutls_certificate_credentials_t cred;
122
164
unsigned int dh_bits;
123
165
gnutls_dh_params_t dh_params;
124
166
const char *priority;
125
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
126
171
} mandos_context;
127
172
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
128
198
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
131
201
* "buffer_length" is how much is already used.
132
202
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
135
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
138
213
return 0;
139
214
}
215
*buffer = new_buf;
140
216
buffer_capacity += BUFFER_SIZE;
141
217
}
142
218
return buffer_capacity;
143
219
}
144
220
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
free(new_server->ip);
244
free(new_server);
245
return false;
246
}
247
/* Special case of first server */
248
if(*current_server == NULL){
249
new_server->next = new_server;
250
new_server->prev = new_server;
251
*current_server = new_server;
252
} else {
253
/* Place the new server last in the list */
254
new_server->next = *current_server;
255
new_server->prev = (*current_server)->prev;
256
new_server->prev->next = new_server;
257
(*current_server)->prev = new_server;
258
}
259
return true;
260
}
261
145
262
/*
146
263
* Initialize GPGME.
147
264
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
265
__attribute__((nonnull, warn_unused_result))
266
static bool init_gpgme(const char * const seckey,
267
const char * const pubkey,
268
const char * const tempdir,
269
mandos_context *mc){
151
270
gpgme_error_t rc;
152
271
gpgme_engine_info_t engine_info;
153
272
154
155
273
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
274
* Helper function to insert pub and seckey to the engine keyring.
157
275
*/
158
bool import_key(const char *filename){
276
bool import_key(const char * const filename){
277
int ret;
159
278
int fd;
160
279
gpgme_data_t pgp_data;
161
280
162
281
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
282
if(fd == -1){
164
perror("open");
283
perror_plus("open");
165
284
return false;
166
285
}
167
286
168
287
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
288
if(rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
172
291
return false;
173
292
}
174
293
175
294
rc = gpgme_op_import(mc->ctx, pgp_data);
176
295
if(rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
179
298
return false;
180
299
}
181
300
182
301
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
302
if(ret == -1){
184
perror("close");
303
perror_plus("close");
185
304
}
186
305
gpgme_data_release(pgp_data);
187
306
return true;
188
307
}
189
308
190
309
if(debug){
191
fprintf(stderr, "Initialize gpgme\n");
310
fprintf_plus(stderr, "Initializing GPGME\n");
192
311
}
193
312
194
313
/* Init GPGME */
195
314
gpgme_check_version(NULL);
196
315
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
316
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
317
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
318
gpgme_strsource(rc), gpgme_strerror(rc));
200
319
return false;
201
320
}
202
321
203
/* Set GPGME home directory for the OpenPGP engine only */
322
/* Set GPGME home directory for the OpenPGP engine only */
204
323
rc = gpgme_get_engine_info(&engine_info);
205
324
if(rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
325
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
326
gpgme_strsource(rc), gpgme_strerror(rc));
208
327
return false;
209
328
}
210
329
while(engine_info != NULL){
216
335
engine_info = engine_info->next;
217
336
}
218
337
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
338
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
339
tempdir);
220
340
return false;
221
341
}
222
342
223
343
/* Create new GPGME "context" */
224
344
rc = gpgme_new(&(mc->ctx));
225
345
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
346
fprintf_plus(stderr, "Mandos plugin mandos-client: "
347
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
348
gpgme_strerror(rc));
228
349
return false;
229
350
}
230
351
232
353
return false;
233
354
}
234
355
235
return true;
356
return true;
236
357
}
237
358
238
359
/*
239
360
* Decrypt OpenPGP data.
240
361
* Returns -1 on error
241
362
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
363
__attribute__((nonnull, warn_unused_result))
364
static ssize_t pgp_packet_decrypt(const char *cryptotext,
244
365
size_t crypto_size,
245
char **plaintext){
366
char **plaintext,
367
mandos_context *mc){
246
368
gpgme_data_t dh_crypto, dh_plain;
247
369
gpgme_error_t rc;
248
370
ssize_t ret;
250
372
ssize_t plaintext_length = 0;
251
373
252
374
if(debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
375
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
254
376
}
255
377
256
378
/* Create new GPGME data buffer from memory cryptotext */
257
379
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
380
0);
259
381
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
262
384
return -1;
263
385
}
264
386
265
387
/* Create new empty GPGME data buffer for the plaintext */
266
388
rc = gpgme_data_new(&dh_plain);
267
389
if(rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
390
fprintf_plus(stderr, "Mandos plugin mandos-client: "
391
"bad gpgme_data_new: %s: %s\n",
392
gpgme_strsource(rc), gpgme_strerror(rc));
270
393
gpgme_data_release(dh_crypto);
271
394
return -1;
272
395
}
275
398
data buffer */
276
399
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
400
if(rc != GPG_ERR_NO_ERROR){
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
401
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
402
gpgme_strsource(rc), gpgme_strerror(rc));
280
403
plaintext_length = -1;
281
404
if(debug){
282
405
gpgme_decrypt_result_t result;
283
406
result = gpgme_op_decrypt_result(mc->ctx);
284
407
if(result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
408
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
286
409
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
410
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
411
result->unsupported_algorithm);
412
fprintf_plus(stderr, "Wrong key usage: %u\n",
413
result->wrong_key_usage);
291
414
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
415
fprintf_plus(stderr, "File name: %s\n", result->file_name);
293
416
}
294
417
gpgme_recipient_t recipient;
295
418
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
419
while(recipient != NULL){
420
fprintf_plus(stderr, "Public key algorithm: %s\n",
421
gpgme_pubkey_algo_name
422
(recipient->pubkey_algo));
423
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
424
fprintf_plus(stderr, "Secret key available: %s\n",
425
recipient->status == GPG_ERR_NO_SECKEY
426
? "No" : "Yes");
427
recipient = recipient->next;
306
428
}
307
429
}
308
430
}
310
432
}
311
433
312
434
if(debug){
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
435
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
314
436
}
315
437
316
438
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
439
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
440
perror_plus("gpgme_data_seek");
319
441
plaintext_length = -1;
320
442
goto decrypt_end;
321
443
}
322
444
323
445
*plaintext = NULL;
324
446
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
447
plaintext_capacity = incbuffer(plaintext,
448
(size_t)plaintext_length,
449
plaintext_capacity);
328
450
if(plaintext_capacity == 0){
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
451
perror_plus("incbuffer");
452
plaintext_length = -1;
453
goto decrypt_end;
332
454
}
333
455
334
456
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
339
461
break;
340
462
}
341
463
if(ret < 0){
342
perror("gpgme_data_read");
464
perror_plus("gpgme_data_read");
343
465
plaintext_length = -1;
344
466
goto decrypt_end;
345
467
}
347
469
}
348
470
349
471
if(debug){
350
fprintf(stderr, "Decrypted password is: ");
472
fprintf_plus(stderr, "Decrypted password is: ");
351
473
for(ssize_t i = 0; i < plaintext_length; i++){
352
474
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
353
475
}
364
486
return plaintext_length;
365
487
}
366
488
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning from
369
-Wunreachable-code */
489
__attribute__((warn_unused_result))
490
static const char *safer_gnutls_strerror(int value){
491
const char *ret = gnutls_strerror(value);
370
492
if(ret == NULL)
371
493
ret = "(unknown)";
372
494
return ret;
373
495
}
374
496
375
497
/* GnuTLS log function callback */
498
__attribute__((nonnull))
376
499
static void debuggnutls(__attribute__((unused)) int level,
377
500
const char* string){
378
fprintf(stderr, "GnuTLS: %s", string);
501
fprintf_plus(stderr, "GnuTLS: %s", string);
379
502
}
380
503
381
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
383
const char *seckeyfilename){
504
__attribute__((nonnull, warn_unused_result))
505
static int init_gnutls_global(const char *pubkeyfilename,
506
const char *seckeyfilename,
507
mandos_context *mc){
384
508
int ret;
385
509
386
510
if(debug){
387
fprintf(stderr, "Initializing GnuTLS\n");
511
fprintf_plus(stderr, "Initializing GnuTLS\n");
388
512
}
389
513
390
514
ret = gnutls_global_init();
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
515
if(ret != GNUTLS_E_SUCCESS){
516
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
517
safer_gnutls_strerror(ret));
394
518
return -1;
395
519
}
396
520
403
527
}
404
528
405
529
/* OpenPGP credentials */
406
gnutls_certificate_allocate_credentials(&mc->cred);
530
ret = gnutls_certificate_allocate_credentials(&mc->cred);
407
531
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
409
* from
410
* -Wunreachable-code
411
*/
412
safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
safer_gnutls_strerror(ret));
413
534
gnutls_global_deinit();
414
535
return -1;
415
536
}
416
537
417
538
if(debug){
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
420
seckeyfilename);
539
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
540
" secret key %s as GnuTLS credentials\n",
541
pubkeyfilename,
542
seckeyfilename);
421
543
}
422
544
423
545
ret = gnutls_certificate_set_openpgp_key_file
424
546
(mc->cred, pubkeyfilename, seckeyfilename,
425
547
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
427
fprintf(stderr,
428
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
431
safer_gnutls_strerror(ret));
548
if(ret != GNUTLS_E_SUCCESS){
549
fprintf_plus(stderr,
550
"Error[%d] while reading the OpenPGP key pair ('%s',"
551
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
552
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
553
safer_gnutls_strerror(ret));
432
554
goto globalfail;
433
555
}
434
556
435
557
/* GnuTLS server initialization */
436
558
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
" %s\n", safer_gnutls_strerror(ret));
559
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
561
" initialization: %s\n",
562
safer_gnutls_strerror(ret));
440
563
goto globalfail;
441
564
}
442
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
safer_gnutls_strerror(ret));
566
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
safer_gnutls_strerror(ret));
446
569
goto globalfail;
447
570
}
448
571
458
581
return -1;
459
582
}
460
583
461
static int init_gnutls_session(mandos_context *mc,
462
gnutls_session_t *session){
584
__attribute__((nonnull, warn_unused_result))
585
static int init_gnutls_session(gnutls_session_t *session,
586
mandos_context *mc){
463
587
int ret;
464
588
/* GnuTLS session creation */
465
ret = gnutls_init(session, GNUTLS_SERVER);
589
do {
590
ret = gnutls_init(session, GNUTLS_SERVER);
591
if(quit_now){
592
return -1;
593
}
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
466
595
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
safer_gnutls_strerror(ret));
596
fprintf_plus(stderr,
597
"Error in GnuTLS session initialization: %s\n",
598
safer_gnutls_strerror(ret));
469
599
}
470
600
471
601
{
472
602
const char *err;
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
475
fprintf(stderr, "Syntax error at: %s\n", err);
476
fprintf(stderr, "GnuTLS error: %s\n",
477
safer_gnutls_strerror(ret));
603
do {
604
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
605
if(quit_now){
606
gnutls_deinit(*session);
607
return -1;
608
}
609
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
610
if(ret != GNUTLS_E_SUCCESS){
611
fprintf_plus(stderr, "Syntax error at: %s\n", err);
612
fprintf_plus(stderr, "GnuTLS error: %s\n",
613
safer_gnutls_strerror(ret));
478
614
gnutls_deinit(*session);
479
615
return -1;
480
616
}
481
617
}
482
618
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
486
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
safer_gnutls_strerror(ret));
619
do {
620
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
621
mc->cred);
622
if(quit_now){
623
gnutls_deinit(*session);
624
return -1;
625
}
626
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
629
safer_gnutls_strerror(ret));
488
630
gnutls_deinit(*session);
489
631
return -1;
490
632
}
491
633
492
634
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
635
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
495
636
496
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
497
638
503
644
__attribute__((unused)) const char *txt){}
504
645
505
646
/* Called when a Mandos server is found */
506
static int start_mandos_communication(const char *ip, uint16_t port,
647
__attribute__((nonnull, warn_unused_result))
648
static int start_mandos_communication(const char *ip, in_port_t port,
507
649
AvahiIfIndex if_index,
508
mandos_context *mc){
509
int ret, tcp_sd;
650
int af, mandos_context *mc){
651
int ret, tcp_sd = -1;
510
652
ssize_t sret;
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
653
struct sockaddr_storage to;
512
654
char *buffer = NULL;
513
char *decrypted_buffer;
655
char *decrypted_buffer = NULL;
514
656
size_t buffer_length = 0;
515
657
size_t buffer_capacity = 0;
516
ssize_t decrypted_buffer_size;
517
658
size_t written;
518
int retval = 0;
519
char interface[IF_NAMESIZE];
659
int retval = -1;
520
660
gnutls_session_t session;
521
522
ret = init_gnutls_session(mc, &session);
661
int pf; /* Protocol family */
662
663
errno = 0;
664
665
if(quit_now){
666
errno = EINTR;
667
return -1;
668
}
669
670
switch(af){
671
case AF_INET6:
672
pf = PF_INET6;
673
break;
674
case AF_INET:
675
pf = PF_INET;
676
break;
677
default:
678
fprintf_plus(stderr, "Bad address family: %d\n", af);
679
errno = EINVAL;
680
return -1;
681
}
682
683
/* If the interface is specified and we have a list of interfaces */
684
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
685
/* Check if the interface is one of the interfaces we are using */
686
bool match = false;
687
{
688
char *interface = NULL;
689
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
690
interface))){
691
if(if_nametoindex(interface) == (unsigned int)if_index){
692
match = true;
693
break;
694
}
695
}
696
}
697
if(not match){
698
/* This interface does not match any in the list, so we don't
699
connect to the server */
700
if(debug){
701
char interface[IF_NAMESIZE];
702
if(if_indextoname((unsigned int)if_index, interface) == NULL){
703
perror_plus("if_indextoname");
704
} else {
705
fprintf_plus(stderr, "Skipping server on non-used interface"
706
" \"%s\"\n",
707
if_indextoname((unsigned int)if_index,
708
interface));
709
}
710
}
711
return -1;
712
}
713
}
714
715
ret = init_gnutls_session(&session, mc);
523
716
if(ret != 0){
524
717
return -1;
525
718
}
526
719
527
720
if(debug){
528
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
529
"\n", ip, port);
530
}
531
532
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(tcp_sd < 0) {
534
perror("socket");
535
return -1;
536
}
537
538
if(debug){
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
perror("if_indextoname");
541
return -1;
542
}
543
fprintf(stderr, "Binding to interface %s\n", interface);
721
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
722
PRIuMAX "\n", ip, (uintmax_t)port);
723
}
724
725
tcp_sd = socket(pf, SOCK_STREAM, 0);
726
if(tcp_sd < 0){
727
int e = errno;
728
perror_plus("socket");
729
errno = e;
730
goto mandos_end;
731
}
732
733
if(quit_now){
734
errno = EINTR;
735
goto mandos_end;
544
736
}
545
737
546
738
memset(&to, 0, sizeof(to));
547
to.in6.sin6_family = AF_INET6;
548
/* It would be nice to have a way to detect if we were passed an
549
IPv4 address here. Now we assume an IPv6 address. */
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
739
if(af == AF_INET6){
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
742
} else { /* IPv4 */
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
745
}
551
746
if(ret < 0 ){
552
perror("inet_pton");
553
return -1;
747
int e = errno;
748
perror_plus("inet_pton");
749
errno = e;
750
goto mandos_end;
554
751
}
555
752
if(ret == 0){
556
fprintf(stderr, "Bad address: %s\n", ip);
557
return -1;
558
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
753
int e = errno;
754
fprintf_plus(stderr, "Bad address: %s\n", ip);
755
errno = e;
756
goto mandos_end;
757
}
758
if(af == AF_INET6){
759
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
760
if(IN6_IS_ADDR_LINKLOCAL
761
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
762
if(if_index == AVAHI_IF_UNSPEC){
763
fprintf_plus(stderr, "An IPv6 link-local address is"
764
" incomplete without a network interface\n");
765
errno = EINVAL;
766
goto mandos_end;
767
}
768
/* Set the network interface number as scope */
769
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
770
}
771
} else {
772
((struct sockaddr_in *)&to)->sin_port = htons(port);
773
}
562
774
563
to.in6.sin6_scope_id = (uint32_t)if_index;
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
564
779
565
780
if(debug){
566
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
567
port);
568
char addrstr[INET6_ADDRSTRLEN] = "";
569
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
570
sizeof(addrstr)) == NULL){
571
perror("inet_ntop");
572
} else {
573
if(strcmp(addrstr, ip) != 0){
574
fprintf(stderr, "Canonical address form: %s\n", addrstr);
781
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
782
char interface[IF_NAMESIZE];
783
if(if_indextoname((unsigned int)if_index, interface) == NULL){
784
perror_plus("if_indextoname");
785
} else {
786
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
787
"\n", ip, interface, (uintmax_t)port);
575
788
}
576
}
577
}
578
579
ret = connect(tcp_sd, &to.in, sizeof(to));
789
} else {
790
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
791
ip, (uintmax_t)port);
792
}
793
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
794
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
795
if(af == AF_INET6){
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in6),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
800
} else {
801
ret = getnameinfo((struct sockaddr *)&to,
802
sizeof(struct sockaddr_in),
803
addrstr, sizeof(addrstr), NULL, 0,
804
NI_NUMERICHOST);
805
}
806
if(ret == EAI_SYSTEM){
807
perror_plus("getnameinfo");
808
} else if(ret != 0) {
809
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
810
} else if(strcmp(addrstr, ip) != 0){
811
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
812
}
813
}
814
815
if(quit_now){
816
errno = EINTR;
817
goto mandos_end;
818
}
819
820
if(af == AF_INET6){
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
823
} else {
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
826
}
580
827
if(ret < 0){
581
perror("connect");
582
return -1;
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
829
int e = errno;
830
perror_plus("connect");
831
errno = e;
832
}
833
goto mandos_end;
834
}
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
583
839
}
584
840
585
841
const char *out = mandos_protocol_version;
587
843
while(true){
588
844
size_t out_size = strlen(out);
589
845
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
out_size - written));
846
out_size - written));
591
847
if(ret == -1){
592
perror("write");
593
retval = -1;
848
int e = errno;
849
perror_plus("write");
850
errno = e;
594
851
goto mandos_end;
595
852
}
596
853
written += (size_t)ret;
604
861
break;
605
862
}
606
863
}
864
865
if(quit_now){
866
errno = EINTR;
867
goto mandos_end;
868
}
607
869
}
608
870
609
871
if(debug){
610
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
}
612
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
615
do{
872
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
873
}
874
875
if(quit_now){
876
errno = EINTR;
877
goto mandos_end;
878
}
879
880
/* This casting via intptr_t is to eliminate warning about casting
881
an int to a pointer type. This is exactly how the GnuTLS Guile
882
function "set-session-transport-fd!" does it. */
883
gnutls_transport_set_ptr(session,
884
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
885
886
if(quit_now){
887
errno = EINTR;
888
goto mandos_end;
889
}
890
891
do {
616
892
ret = gnutls_handshake(session);
893
if(quit_now){
894
errno = EINTR;
895
goto mandos_end;
896
}
617
897
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
898
619
899
if(ret != GNUTLS_E_SUCCESS){
620
900
if(debug){
621
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
622
902
gnutls_perror(ret);
623
903
}
624
retval = -1;
904
errno = EPROTO;
625
905
goto mandos_end;
626
906
}
627
907
628
908
/* Read OpenPGP packet that contains the wanted password */
629
909
630
910
if(debug){
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
632
ip);
911
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
912
" %s\n", ip);
633
913
}
634
914
635
915
while(true){
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
637
buffer_capacity);
916
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
buffer_capacity = incbuffer(&buffer, buffer_length,
923
buffer_capacity);
638
924
if(buffer_capacity == 0){
639
perror("adjustbuffer");
640
retval = -1;
925
int e = errno;
926
perror_plus("incbuffer");
927
errno = e;
928
goto mandos_end;
929
}
930
931
if(quit_now){
932
errno = EINTR;
641
933
goto mandos_end;
642
934
}
643
935
652
944
case GNUTLS_E_AGAIN:
653
945
break;
654
946
case GNUTLS_E_REHANDSHAKE:
655
do{
947
do {
656
948
ret = gnutls_handshake(session);
949
950
if(quit_now){
951
errno = EINTR;
952
goto mandos_end;
953
}
657
954
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
955
if(ret < 0){
659
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
956
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
957
"***\n");
660
958
gnutls_perror(ret);
661
retval = -1;
959
errno = EPROTO;
662
960
goto mandos_end;
663
961
}
664
962
break;
665
963
default:
666
fprintf(stderr, "Unknown error while reading data from"
667
" encrypted session with Mandos server\n");
668
retval = -1;
964
fprintf_plus(stderr, "Unknown error while reading data from"
965
" encrypted session with Mandos server\n");
669
966
gnutls_bye(session, GNUTLS_SHUT_RDWR);
967
errno = EIO;
670
968
goto mandos_end;
671
969
}
672
970
} else {
675
973
}
676
974
677
975
if(debug){
678
fprintf(stderr, "Closing TLS session\n");
679
}
680
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
976
fprintf_plus(stderr, "Closing TLS session\n");
977
}
978
979
if(quit_now){
980
errno = EINTR;
981
goto mandos_end;
982
}
983
984
do {
985
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
986
if(quit_now){
987
errno = EINTR;
988
goto mandos_end;
989
}
990
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
682
991
683
992
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
685
buffer_length,
686
&decrypted_buffer);
993
ssize_t decrypted_buffer_size;
994
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
995
&decrypted_buffer, mc);
687
996
if(decrypted_buffer_size >= 0){
997
688
998
written = 0;
689
999
while(written < (size_t) decrypted_buffer_size){
1000
if(quit_now){
1001
errno = EINTR;
1002
goto mandos_end;
1003
}
1004
690
1005
ret = (int)fwrite(decrypted_buffer + written, 1,
691
1006
(size_t)decrypted_buffer_size - written,
692
1007
stdout);
693
1008
if(ret == 0 and ferror(stdout)){
1009
int e = errno;
694
1010
if(debug){
695
fprintf(stderr, "Error writing encrypted data: %s\n",
696
strerror(errno));
1011
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1012
strerror(errno));
697
1013
}
698
retval = -1;
699
break;
1014
errno = e;
1015
goto mandos_end;
700
1016
}
701
1017
written += (size_t)ret;
702
1018
}
703
free(decrypted_buffer);
704
} else {
705
retval = -1;
1019
retval = 0;
706
1020
}
707
} else {
708
retval = -1;
709
1021
}
710
1022
711
1023
/* Shutdown procedure */
712
1024
713
1025
mandos_end:
714
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
1026
{
1027
int e = errno;
1028
free(decrypted_buffer);
1029
free(buffer);
1030
if(tcp_sd >= 0){
1031
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1032
}
1033
if(ret == -1){
1034
if(e == 0){
1035
e = errno;
1036
}
1037
perror_plus("close");
1038
}
1039
gnutls_deinit(session);
1040
errno = e;
1041
if(quit_now){
1042
errno = EINTR;
1043
retval = -1;
1044
}
718
1045
}
719
gnutls_deinit(session);
720
1046
return retval;
721
1047
}
722
1048
1049
__attribute__((nonnull))
723
1050
static void resolve_callback(AvahiSServiceResolver *r,
724
1051
AvahiIfIndex interface,
725
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1052
AvahiProtocol proto,
726
1053
AvahiResolverEvent event,
727
1054
const char *name,
728
1055
const char *type,
733
1060
AVAHI_GCC_UNUSED AvahiStringList *txt,
734
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
735
1062
flags,
736
void* userdata) {
737
mandos_context *mc = userdata;
738
assert(r);
1063
void *mc){
1064
if(r == NULL){
1065
return;
1066
}
739
1067
740
1068
/* Called whenever a service has been resolved successfully or
741
1069
timed out */
742
1070
743
switch(event) {
1071
if(quit_now){
1072
return;
1073
}
1074
1075
switch(event){
744
1076
default:
745
1077
case AVAHI_RESOLVER_FAILURE:
746
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
747
" of type '%s' in domain '%s': %s\n", name, type, domain,
748
avahi_strerror(avahi_server_errno(mc->server)));
1078
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1079
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1080
domain,
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
749
1083
break;
750
1084
751
1085
case AVAHI_RESOLVER_FOUND:
753
1087
char ip[AVAHI_ADDRESS_STR_MAX];
754
1088
avahi_address_snprint(ip, sizeof(ip), address);
755
1089
if(debug){
756
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
ip, (intmax_t)interface, port);
1090
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1091
PRIdMAX ") on port %" PRIu16 "\n", name,
1092
host_name, ip, (intmax_t)interface, port);
759
1093
}
760
int ret = start_mandos_communication(ip, port, interface, mc);
1094
int ret = start_mandos_communication(ip, (in_port_t)port,
1095
interface,
1096
avahi_proto_to_af(proto),
1097
mc);
761
1098
if(ret == 0){
762
avahi_simple_poll_quit(mc->simple_poll);
1099
avahi_simple_poll_quit(simple_poll);
1100
} else {
1101
if(not add_server(ip, (in_port_t)port, interface,
1102
avahi_proto_to_af(proto),
1103
&((mandos_context*)mc)->current_server)){
1104
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1105
" list\n", name);
1106
}
763
1107
}
764
1108
}
765
1109
}
766
1110
avahi_s_service_resolver_free(r);
767
1111
}
768
1112
769
static void browse_callback( AvahiSServiceBrowser *b,
770
AvahiIfIndex interface,
771
AvahiProtocol protocol,
772
AvahiBrowserEvent event,
773
const char *name,
774
const char *type,
775
const char *domain,
776
AVAHI_GCC_UNUSED AvahiLookupResultFlags
777
flags,
778
void* userdata) {
779
mandos_context *mc = userdata;
780
assert(b);
1113
static void browse_callback(AvahiSServiceBrowser *b,
1114
AvahiIfIndex interface,
1115
AvahiProtocol protocol,
1116
AvahiBrowserEvent event,
1117
const char *name,
1118
const char *type,
1119
const char *domain,
1120
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1121
flags,
1122
void *mc){
1123
if(b == NULL){
1124
return;
1125
}
781
1126
782
1127
/* Called whenever a new services becomes available on the LAN or
783
1128
is removed from the LAN */
784
1129
785
switch(event) {
1130
if(quit_now){
1131
return;
1132
}
1133
1134
switch(event){
786
1135
default:
787
1136
case AVAHI_BROWSER_FAILURE:
788
1137
789
fprintf(stderr, "(Avahi browser) %s\n",
790
avahi_strerror(avahi_server_errno(mc->server)));
791
avahi_simple_poll_quit(mc->simple_poll);
1138
fprintf_plus(stderr, "(Avahi browser) %s\n",
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1141
avahi_simple_poll_quit(simple_poll);
792
1142
return;
793
1143
794
1144
case AVAHI_BROWSER_NEW:
797
1147
the callback function is called the Avahi server will free the
798
1148
resolver for us. */
799
1149
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
801
protocol, name, type, domain,
802
AVAHI_PROTO_INET6, 0,
803
resolve_callback, mc)))
804
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
805
name, avahi_strerror(avahi_server_errno(mc->server)));
1150
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1151
interface, protocol, name, type,
1152
domain, protocol, 0,
1153
resolve_callback, mc) == NULL)
1154
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1155
" %s\n", name,
1156
avahi_strerror(avahi_server_errno
1157
(((mandos_context*)mc)->server)));
806
1158
break;
807
1159
808
1160
case AVAHI_BROWSER_REMOVE:
811
1163
case AVAHI_BROWSER_ALL_FOR_NOW:
812
1164
case AVAHI_BROWSER_CACHE_EXHAUSTED:
813
1165
if(debug){
814
fprintf(stderr, "No Mandos server found, still searching...\n");
1166
fprintf_plus(stderr, "No Mandos server found, still"
1167
" searching...\n");
815
1168
}
816
1169
break;
817
1170
}
818
1171
}
819
1172
1173
/* Signal handler that stops main loop after SIGTERM */
1174
static void handle_sigterm(int sig){
1175
if(quit_now){
1176
return;
1177
}
1178
quit_now = 1;
1179
signal_received = sig;
1180
int old_errno = errno;
1181
/* set main loop to exit */
1182
if(simple_poll != NULL){
1183
avahi_simple_poll_quit(simple_poll);
1184
}
1185
errno = old_errno;
1186
}
1187
1188
__attribute__((nonnull, warn_unused_result))
1189
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
int ret;
1191
error_t ret_errno;
1192
1193
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1194
if(s < 0){
1195
ret_errno = errno;
1196
perror_plus("socket");
1197
errno = ret_errno;
1198
return false;
1199
}
1200
strcpy(ifr->ifr_name, ifname);
1201
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
if(ret == -1){
1203
if(debug){
1204
ret_errno = errno;
1205
perror_plus("ioctl SIOCGIFFLAGS");
1206
errno = ret_errno;
1207
}
1208
return false;
1209
}
1210
return true;
1211
}
1212
1213
__attribute__((nonnull, warn_unused_result))
1214
bool good_flags(const char *ifname, const struct ifreq *ifr){
1215
1216
/* Reject the loopback device */
1217
if(ifr->ifr_flags & IFF_LOOPBACK){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1220
ifname);
1221
}
1222
return false;
1223
}
1224
/* Accept point-to-point devices only if connect_to is specified */
1225
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1226
if(debug){
1227
fprintf_plus(stderr, "Accepting point-to-point interface"
1228
" \"%s\"\n", ifname);
1229
}
1230
return true;
1231
}
1232
/* Otherwise, reject non-broadcast-capable devices */
1233
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1234
if(debug){
1235
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1236
" \"%s\"\n", ifname);
1237
}
1238
return false;
1239
}
1240
/* Reject non-ARP interfaces (including dummy interfaces) */
1241
if(ifr->ifr_flags & IFF_NOARP){
1242
if(debug){
1243
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1244
ifname);
1245
}
1246
return false;
1247
}
1248
1249
/* Accept this device */
1250
if(debug){
1251
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1252
}
1253
return true;
1254
}
1255
1256
/*
1257
* This function determines if a directory entry in /sys/class/net
1258
* corresponds to an acceptable network device.
1259
* (This function is passed to scandir(3) as a filter function.)
1260
*/
1261
__attribute__((nonnull, warn_unused_result))
1262
int good_interface(const struct dirent *if_entry){
1263
if(if_entry->d_name[0] == '.'){
1264
return 0;
1265
}
1266
1267
struct ifreq ifr;
1268
if(not get_flags(if_entry->d_name, &ifr)){
1269
if(debug){
1270
fprintf_plus(stderr, "Failed to get flags for interface "
1271
"\"%s\"\n", if_entry->d_name);
1272
}
1273
return 0;
1274
}
1275
1276
if(not good_flags(if_entry->d_name, &ifr)){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/*
1283
* This function determines if a network interface is up.
1284
*/
1285
__attribute__((nonnull, warn_unused_result))
1286
bool interface_is_up(const char *interface){
1287
struct ifreq ifr;
1288
if(not get_flags(interface, &ifr)){
1289
if(debug){
1290
fprintf_plus(stderr, "Failed to get flags for interface "
1291
"\"%s\"\n", interface);
1292
}
1293
return false;
1294
}
1295
1296
return (bool)(ifr.ifr_flags & IFF_UP);
1297
}
1298
1299
/*
1300
* This function determines if a network interface is running
1301
*/
1302
__attribute__((nonnull, warn_unused_result))
1303
bool interface_is_running(const char *interface){
1304
struct ifreq ifr;
1305
if(not get_flags(interface, &ifr)){
1306
if(debug){
1307
fprintf_plus(stderr, "Failed to get flags for interface "
1308
"\"%s\"\n", interface);
1309
}
1310
return false;
1311
}
1312
1313
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1314
}
1315
1316
__attribute__((nonnull, pure, warn_unused_result))
1317
int notdotentries(const struct dirent *direntry){
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1323
return 0;
1324
}
1325
return 1;
1326
}
1327
1328
/* Is this directory entry a runnable program? */
1329
__attribute__((nonnull, warn_unused_result))
1330
int runnable_hook(const struct dirent *direntry){
1331
int ret;
1332
size_t sret;
1333
struct stat st;
1334
1335
if((direntry->d_name)[0] == '\0'){
1336
/* Empty name? */
1337
return 0;
1338
}
1339
1340
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1341
"abcdefghijklmnopqrstuvwxyz"
1342
"0123456789"
1343
"_.-");
1344
if((direntry->d_name)[sret] != '\0'){
1345
/* Contains non-allowed characters */
1346
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1348
direntry->d_name);
1349
}
1350
return 0;
1351
}
1352
1353
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1380
return 1;
1381
}
1382
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1386
int ret;
1387
struct timespec now;
1388
struct timespec waited_time;
1389
intmax_t block_time;
1390
1391
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1396
}
1397
ret = avahi_simple_poll_iterate(s, -1);
1398
} else {
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1402
}
1403
/* the current time */
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1405
if(ret == -1){
1406
perror_plus("clock_gettime");
1407
return -1;
1408
}
1409
/* Calculating in ms how long time between now and server
1410
who we visted longest time ago. Now - last seen. */
1411
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1413
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1415
/* total time is 10s/10,000ms.
1416
Converting to s from ms by dividing by 1,000,
1417
and ns to ms by dividing by 1,000,000. */
1418
block_time = ((retry_interval
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1425
}
1426
1427
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1432
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1434
return 0;
1435
}
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1438
if(ret == -1){
1439
perror_plus("clock_gettime");
1440
return -1;
1441
}
1442
mc->current_server = mc->current_server->next;
1443
block_time = 0; /* Call avahi to find new Mandos
1444
servers, but don't block */
1445
}
1446
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
}
1449
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1451
return (ret != 1) ? ret : 0;
1452
}
1453
}
1454
}
1455
}
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1474
if(ret_errno != 0){
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
if(setuid(0) == -1){
1479
ret_errno = errno;
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1491
ret_errno = errno;
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
__attribute__((nonnull))
1510
void run_network_hooks(const char *mode, const char *interface,
1511
const float delay){
1512
struct dirent **direntries = NULL;
1513
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
1515
if(hookdir_fd == -1){
1516
if(errno == ENOENT){
1517
if(debug){
1518
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1519
" found\n", hookdir);
1520
}
1521
} else {
1522
perror_plus("open");
1523
}
1524
return;
1525
}
1526
}
1527
#ifdef __GLIBC__
1528
#if __GLIBC_PREREQ(2, 15)
1529
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1533
alphasort);
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1537
alphasort);
1538
#endif /* not __GLIBC__ */
1539
if(numhooks == -1){
1540
perror_plus("scandir");
1541
return;
1542
}
1543
struct dirent *direntry;
1544
int ret;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
for(int i = 0; i < numhooks; i++){
1547
direntry = direntries[i];
1548
if(debug){
1549
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1550
direntry->d_name);
1551
}
1552
pid_t hook_pid = fork();
1553
if(hook_pid == 0){
1554
/* Child */
1555
/* Raise privileges */
1556
errno = raise_privileges_permanently();
1557
if(errno != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1676
} else {
1677
hookdir_fd = -1;
1678
}
1679
close(devnull);
1680
}
1681
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
1686
int ret;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1689
if(if_index == 0){
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
errno = old_errno;
1692
return ENXIO;
1693
}
1694
1695
if(quit_now){
1696
errno = old_errno;
1697
return EINTR;
1698
}
1699
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1703
ret_errno = errno;
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1706
errno = old_errno;
1707
return ret_errno;
1708
}
1709
network.ifr_flags |= IFF_UP; /* set flag */
1710
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
if(sd == -1){
1713
ret_errno = errno;
1714
perror_plus("socket");
1715
errno = old_errno;
1716
return ret_errno;
1717
}
1718
1719
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
if(ret == -1){
1722
perror_plus("close");
1723
}
1724
errno = old_errno;
1725
return EINTR;
1726
}
1727
1728
if(debug){
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1730
interface);
1731
}
1732
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1735
if(ret_errno != 0){
1736
errno = ret_errno;
1737
perror_plus("Failed to raise privileges");
1738
}
1739
1740
#ifdef __linux__
1741
int ret_linux;
1742
bool restore_loglevel = false;
1743
if(ret_errno == 0){
1744
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1745
messages about the network interface to mess up the prompt */
1746
ret_linux = klogctl(8, NULL, 5);
1747
if(ret_linux == -1){
1748
perror_plus("klogctl");
1749
} else {
1750
restore_loglevel = true;
1751
}
1752
}
1753
#endif /* __linux__ */
1754
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1755
ioctl_errno = errno;
1756
#ifdef __linux__
1757
if(restore_loglevel){
1758
ret_linux = klogctl(7, NULL, 0);
1759
if(ret_linux == -1){
1760
perror_plus("klogctl");
1761
}
1762
}
1763
#endif /* __linux__ */
1764
1765
/* If raise_privileges() succeeded above */
1766
if(ret_errno == 0){
1767
/* Lower privileges */
1768
ret_errno = lower_privileges();
1769
if(ret_errno != 0){
1770
errno = ret_errno;
1771
perror_plus("Failed to lower privileges");
1772
}
1773
}
1774
1775
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ioctl_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1784
errno = old_errno;
1785
return ioctl_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1789
interface);
1790
}
1791
1792
/* Sleep checking until interface is running.
1793
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
1795
if(interface_is_running(interface)){
1796
break;
1797
}
1798
struct timespec sleeptime = { .tv_nsec = 250000000 };
1799
ret = nanosleep(&sleeptime, NULL);
1800
if(ret == -1 and errno != EINTR){
1801
perror_plus("nanosleep");
1802
}
1803
}
1804
1805
errno = old_errno;
1806
return 0;
1807
}
1808
1809
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
1821
if(not get_flags(interface, &network) and debug){
1822
ret_errno = errno;
1823
fprintf_plus(stderr, "Failed to get flags for interface "
1824
"\"%s\"\n", interface);
1825
errno = old_errno;
1826
return ret_errno;
1827
}
1828
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1829
1830
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1831
if(sd == -1){
1832
ret_errno = errno;
1833
perror_plus("socket");
1834
errno = old_errno;
1835
return ret_errno;
1836
}
1837
1838
if(debug){
1839
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1840
interface);
1841
}
1842
1843
/* Raise privileges */
1844
ret_errno = raise_privileges();
1845
if(ret_errno != 0){
1846
errno = ret_errno;
1847
perror_plus("Failed to raise privileges");
1848
}
1849
1850
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1851
ioctl_errno = errno;
1852
1853
/* If raise_privileges() succeeded above */
1854
if(ret_errno == 0){
1855
/* Lower privileges */
1856
ret_errno = lower_privileges();
1857
if(ret_errno != 0){
1858
errno = ret_errno;
1859
perror_plus("Failed to lower privileges");
1860
}
1861
}
1862
1863
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1865
if(ret == -1){
1866
perror_plus("close");
1867
}
1868
1869
if(ret_setflags == -1){
1870
errno = ioctl_errno;
1871
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1872
errno = old_errno;
1873
return ioctl_errno;
1874
}
1875
} else if(debug){
1876
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1877
interface);
1878
}
1879
1880
errno = old_errno;
1881
return 0;
1882
}
1883
820
1884
int main(int argc, char *argv[]){
821
AvahiSServiceBrowser *sb = NULL;
822
int error;
823
int ret;
824
intmax_t tmpmax;
825
int numchars;
826
int exitcode = EXIT_SUCCESS;
827
const char *interface = "eth0";
828
struct ifreq network;
829
int sd;
830
uid_t uid;
831
gid_t gid;
832
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
838
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
841
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
843
844
{
845
struct argp_option options[] = {
846
{ .name = "debug", .key = 128,
847
.doc = "Debug mode", .group = 3 },
848
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
851
.group = 1 },
852
{ .name = "interface", .key = 'i',
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
856
.group = 1 },
857
{ .name = "seckey", .key = 's',
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
860
.group = 1 },
861
{ .name = "pubkey", .key = 'p',
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
864
.group = 2 },
865
{ .name = "dh-bits", .key = 129,
866
.arg = "BITS",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
869
.group = 2 },
870
{ .name = "priority", .key = 130,
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
874
{ .name = NULL }
875
};
876
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
881
debug = true;
882
break;
883
case 'c': /* --connect */
884
connect_to = arg;
885
break;
886
case 'i': /* --interface */
887
interface = arg;
888
break;
889
case 's': /* --seckey */
890
seckey = arg;
891
break;
892
case 'p': /* --pubkey */
893
pubkey = arg;
894
break;
895
case 129: /* --dh-bits */
896
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
897
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
898
or arg[numchars] != '\0'){
899
fprintf(stderr, "Bad number of DH bits\n");
900
exit(EXIT_FAILURE);
901
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
903
break;
904
case 130: /* --priority */
905
mc.priority = arg;
906
break;
907
case ARGP_KEY_ARG:
908
argp_usage(state);
909
case ARGP_KEY_END:
910
break;
911
default:
912
return ARGP_ERR_UNKNOWN;
913
}
914
return 0;
915
}
916
917
struct argp argp = { .options = options, .parser = parse_opt,
918
.args_doc = "",
919
.doc = "Mandos client -- Get and decrypt"
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
923
fprintf(stderr, "Unknown error while parsing arguments\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
}
928
929
/* If the interface is down, bring it up */
930
{
931
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
932
if(sd < 0) {
933
perror("socket");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
strcpy(network.ifr_name, interface);
938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCGIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
if((network.ifr_flags & IFF_UP) == 0){
945
network.ifr_flags |= IFF_UP;
946
ret = ioctl(sd, SIOCSIFFLAGS, &network);
947
if(ret == -1){
948
perror("ioctl SIOCSIFFLAGS");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
957
}
958
959
uid = getuid();
960
gid = getgid();
961
962
ret = setuid(uid);
963
if(ret == -1){
964
perror("setuid");
965
}
966
967
setgid(gid);
968
if(ret == -1){
969
perror("setgid");
970
}
971
972
ret = init_gnutls_global(&mc, pubkey, seckey);
973
if(ret == -1){
974
fprintf(stderr, "init_gnutls_global failed\n");
975
exitcode = EXIT_FAILURE;
976
goto end;
977
} else {
978
gnutls_initalized = true;
979
}
980
981
if(mkdtemp(tempdir) == NULL){
982
perror("mkdtemp");
983
tempdir[0] = '\0';
984
goto end;
985
}
986
987
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
988
fprintf(stderr, "gpgme_initalized failed\n");
989
exitcode = EXIT_FAILURE;
990
goto end;
991
} else {
992
gpgme_initalized = true;
993
}
994
995
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
if(if_index == 0){
997
fprintf(stderr, "No such interface: \"%s\"\n", interface);
998
exit(EXIT_FAILURE);
999
}
1000
1001
if(connect_to != NULL){
1002
/* Connect directly, do not use Zeroconf */
1003
/* (Mainly meant for debugging) */
1004
char *address = strrchr(connect_to, ':');
1005
if(address == NULL){
1006
fprintf(stderr, "No colon in address\n");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
uint16_t port;
1011
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1012
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1013
or address[numchars+1] != '\0'){
1014
fprintf(stderr, "Bad port number\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
port = (uint16_t)tmpmax;
1019
*address = '\0';
1020
address = connect_to;
1021
ret = start_mandos_communication(address, port, if_index, &mc);
1022
if(ret < 0){
1023
exitcode = EXIT_FAILURE;
1024
} else {
1025
exitcode = EXIT_SUCCESS;
1026
}
1027
goto end;
1028
}
1029
1030
if(not debug){
1031
avahi_set_log_function(empty_log);
1032
}
1033
1034
/* Initialize the pseudo-RNG for Avahi */
1035
srand((unsigned int) time(NULL));
1036
1037
/* Allocate main Avahi loop object */
1038
mc.simple_poll = avahi_simple_poll_new();
1039
if(mc.simple_poll == NULL) {
1040
fprintf(stderr, "Avahi: Failed to create simple poll"
1041
" object.\n");
1042
exitcode = EXIT_FAILURE;
1043
goto end;
1044
}
1045
1046
{
1047
AvahiServerConfig config;
1048
/* Do not publish any local Zeroconf records */
1049
avahi_server_config_init(&config);
1050
config.publish_hinfo = 0;
1051
config.publish_addresses = 0;
1052
config.publish_workstation = 0;
1053
config.publish_domain = 0;
1054
1055
/* Allocate a new server */
1056
mc.server = avahi_server_new(avahi_simple_poll_get
1057
(mc.simple_poll), &config, NULL,
1058
NULL, &error);
1059
1060
/* Free the Avahi configuration data */
1061
avahi_server_config_free(&config);
1062
}
1063
1064
/* Check if creating the Avahi server object succeeded */
1065
if(mc.server == NULL) {
1066
fprintf(stderr, "Failed to create Avahi server: %s\n",
1067
avahi_strerror(error));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Create the Avahi service browser */
1073
sb = avahi_s_service_browser_new(mc.server, if_index,
1074
AVAHI_PROTO_INET6,
1075
"_mandos._tcp", NULL, 0,
1076
browse_callback, &mc);
1077
if(sb == NULL) {
1078
fprintf(stderr, "Failed to create service browser: %s\n",
1079
avahi_strerror(avahi_server_errno(mc.server)));
1080
exitcode = EXIT_FAILURE;
1081
goto end;
1082
}
1083
1084
/* Run the main loop */
1085
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
1889
AvahiSServiceBrowser *sb = NULL;
1890
error_t ret_errno;
1891
int ret;
1892
intmax_t tmpmax;
1893
char *tmp;
1894
int exitcode = EXIT_SUCCESS;
1895
char *interfaces_to_take_down = NULL;
1896
size_t interfaces_to_take_down_size = 0;
1897
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1898
char old_tempdir[] = "/tmp/mandosXXXXXX";
1899
char *tempdir = NULL;
1900
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1901
const char *seckey = PATHDIR "/" SECKEY;
1902
const char *pubkey = PATHDIR "/" PUBKEY;
1903
char *interfaces_hooks = NULL;
1904
1905
bool gnutls_initialized = false;
1906
bool gpgme_initialized = false;
1907
float delay = 2.5f;
1908
double retry_interval = 10; /* 10s between trying a server and
1909
retrying the same server again */
1910
1911
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1912
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1913
1914
uid = getuid();
1915
gid = getgid();
1916
1917
/* Lower any group privileges we might have, just to be safe */
1918
errno = 0;
1919
ret = setgid(gid);
1920
if(ret == -1){
1921
perror_plus("setgid");
1922
}
1923
1924
/* Lower user privileges (temporarily) */
1925
errno = 0;
1926
ret = seteuid(uid);
1927
if(ret == -1){
1928
perror_plus("seteuid");
1929
}
1930
1931
if(quit_now){
1932
goto end;
1933
}
1934
1935
{
1936
struct argp_option options[] = {
1937
{ .name = "debug", .key = 128,
1938
.doc = "Debug mode", .group = 3 },
1939
{ .name = "connect", .key = 'c',
1940
.arg = "ADDRESS:PORT",
1941
.doc = "Connect directly to a specific Mandos server",
1942
.group = 1 },
1943
{ .name = "interface", .key = 'i',
1944
.arg = "NAME",
1945
.doc = "Network interface that will be used to search for"
1946
" Mandos servers",
1947
.group = 1 },
1948
{ .name = "seckey", .key = 's',
1949
.arg = "FILE",
1950
.doc = "OpenPGP secret key file base name",
1951
.group = 1 },
1952
{ .name = "pubkey", .key = 'p',
1953
.arg = "FILE",
1954
.doc = "OpenPGP public key file base name",
1955
.group = 2 },
1956
{ .name = "dh-bits", .key = 129,
1957
.arg = "BITS",
1958
.doc = "Bit length of the prime number used in the"
1959
" Diffie-Hellman key exchange",
1960
.group = 2 },
1961
{ .name = "priority", .key = 130,
1962
.arg = "STRING",
1963
.doc = "GnuTLS priority string for the TLS handshake",
1964
.group = 1 },
1965
{ .name = "delay", .key = 131,
1966
.arg = "SECONDS",
1967
.doc = "Maximum delay to wait for interface startup",
1968
.group = 2 },
1969
{ .name = "retry", .key = 132,
1970
.arg = "SECONDS",
1971
.doc = "Retry interval used when denied by the Mandos server",
1972
.group = 2 },
1973
{ .name = "network-hook-dir", .key = 133,
1974
.arg = "DIR",
1975
.doc = "Directory where network hooks are located",
1976
.group = 2 },
1977
/*
1978
* These reproduce what we would get without ARGP_NO_HELP
1979
*/
1980
{ .name = "help", .key = '?',
1981
.doc = "Give this help list", .group = -1 },
1982
{ .name = "usage", .key = -3,
1983
.doc = "Give a short usage message", .group = -1 },
1984
{ .name = "version", .key = 'V',
1985
.doc = "Print program version", .group = -1 },
1986
{ .name = NULL }
1987
};
1988
1989
error_t parse_opt(int key, char *arg,
1990
struct argp_state *state){
1991
errno = 0;
1992
switch(key){
1993
case 128: /* --debug */
1994
debug = true;
1995
break;
1996
case 'c': /* --connect */
1997
connect_to = arg;
1998
break;
1999
case 'i': /* --interface */
2000
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2001
arg, (int)',');
2002
if(ret_errno != 0){
2003
argp_error(state, "%s", strerror(ret_errno));
2004
}
2005
break;
2006
case 's': /* --seckey */
2007
seckey = arg;
2008
break;
2009
case 'p': /* --pubkey */
2010
pubkey = arg;
2011
break;
2012
case 129: /* --dh-bits */
2013
errno = 0;
2014
tmpmax = strtoimax(arg, &tmp, 10);
2015
if(errno != 0 or tmp == arg or *tmp != '\0'
2016
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2017
argp_error(state, "Bad number of DH bits");
2018
}
2019
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2020
break;
2021
case 130: /* --priority */
2022
mc.priority = arg;
2023
break;
2024
case 131: /* --delay */
2025
errno = 0;
2026
delay = strtof(arg, &tmp);
2027
if(errno != 0 or tmp == arg or *tmp != '\0'){
2028
argp_error(state, "Bad delay");
2029
}
2030
case 132: /* --retry */
2031
errno = 0;
2032
retry_interval = strtod(arg, &tmp);
2033
if(errno != 0 or tmp == arg or *tmp != '\0'
2034
or (retry_interval * 1000) > INT_MAX
2035
or retry_interval < 0){
2036
argp_error(state, "Bad retry interval");
2037
}
2038
break;
2039
case 133: /* --network-hook-dir */
2040
hookdir = arg;
2041
break;
2042
/*
2043
* These reproduce what we would get without ARGP_NO_HELP
2044
*/
2045
case '?': /* --help */
2046
argp_state_help(state, state->out_stream,
2047
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2048
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2049
case -3: /* --usage */
2050
argp_state_help(state, state->out_stream,
2051
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2052
case 'V': /* --version */
2053
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2054
exit(argp_err_exit_status);
2055
break;
2056
default:
2057
return ARGP_ERR_UNKNOWN;
2058
}
2059
return errno;
2060
}
2061
2062
struct argp argp = { .options = options, .parser = parse_opt,
2063
.args_doc = "",
2064
.doc = "Mandos client -- Get and decrypt"
2065
" passwords from a Mandos server" };
2066
ret = argp_parse(&argp, argc, argv,
2067
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2068
switch(ret){
2069
case 0:
2070
break;
2071
case ENOMEM:
2072
default:
2073
errno = ret;
2074
perror_plus("argp_parse");
2075
exitcode = EX_OSERR;
2076
goto end;
2077
case EINVAL:
2078
exitcode = EX_USAGE;
2079
goto end;
2080
}
2081
}
2082
2083
{
2084
/* Work around Debian bug #633582:
2085
<http://bugs.debian.org/633582> */
2086
2087
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2089
if(ret_errno != 0){
2090
errno = ret_errno;
2091
perror_plus("Failed to raise privileges");
2092
} else {
2093
struct stat st;
2094
2095
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2096
int seckey_fd = open(seckey, O_RDONLY);
2097
if(seckey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(seckey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2113
}
2114
}
2115
2116
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2117
int pubkey_fd = open(pubkey, O_RDONLY);
2118
if(pubkey_fd == -1){
2119
perror_plus("open");
2120
} else {
2121
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2122
if(ret == -1){
2123
perror_plus("fstat");
2124
} else {
2125
if(S_ISREG(st.st_mode)
2126
and st.st_uid == 0 and st.st_gid == 0){
2127
ret = fchown(pubkey_fd, uid, gid);
2128
if(ret == -1){
2129
perror_plus("fchown");
2130
}
2131
}
2132
}
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2134
}
2135
}
2136
2137
/* Lower privileges */
2138
ret_errno = lower_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to lower privileges");
2142
}
2143
}
2144
}
2145
2146
/* Remove invalid interface names (except "none") */
2147
{
2148
char *interface = NULL;
2149
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2150
interface))){
2151
if(strcmp(interface, "none") != 0
2152
and if_nametoindex(interface) == 0){
2153
if(interface[0] != '\0'){
2154
fprintf_plus(stderr, "Not using nonexisting interface"
2155
" \"%s\"\n", interface);
2156
}
2157
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2158
interface = NULL;
2159
}
2160
}
2161
}
2162
2163
/* Run network hooks */
2164
{
2165
if(mc.interfaces != NULL){
2166
interfaces_hooks = malloc(mc.interfaces_size);
2167
if(interfaces_hooks == NULL){
2168
perror_plus("malloc");
2169
goto end;
2170
}
2171
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2172
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2173
}
2174
run_network_hooks("start", interfaces_hooks != NULL ?
2175
interfaces_hooks : "", delay);
2176
}
2177
2178
if(not debug){
2179
avahi_set_log_function(empty_log);
2180
}
2181
2182
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2183
from the signal handler */
2184
/* Initialize the pseudo-RNG for Avahi */
2185
srand((unsigned int) time(NULL));
2186
simple_poll = avahi_simple_poll_new();
2187
if(simple_poll == NULL){
2188
fprintf_plus(stderr,
2189
"Avahi: Failed to create simple poll object.\n");
2190
exitcode = EX_UNAVAILABLE;
2191
goto end;
2192
}
2193
2194
sigemptyset(&sigterm_action.sa_mask);
2195
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2196
if(ret == -1){
2197
perror_plus("sigaddset");
2198
exitcode = EX_OSERR;
2199
goto end;
2200
}
2201
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2202
if(ret == -1){
2203
perror_plus("sigaddset");
2204
exitcode = EX_OSERR;
2205
goto end;
2206
}
2207
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2208
if(ret == -1){
2209
perror_plus("sigaddset");
2210
exitcode = EX_OSERR;
2211
goto end;
2212
}
2213
/* Need to check if the handler is SIG_IGN before handling:
2214
| [[info:libc:Initial Signal Actions]] |
2215
| [[info:libc:Basic Signal Handling]] |
2216
*/
2217
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2218
if(ret == -1){
2219
perror_plus("sigaction");
2220
return EX_OSERR;
2221
}
2222
if(old_sigterm_action.sa_handler != SIG_IGN){
2223
ret = sigaction(SIGINT, &sigterm_action, NULL);
2224
if(ret == -1){
2225
perror_plus("sigaction");
2226
exitcode = EX_OSERR;
2227
goto end;
2228
}
2229
}
2230
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2231
if(ret == -1){
2232
perror_plus("sigaction");
2233
return EX_OSERR;
2234
}
2235
if(old_sigterm_action.sa_handler != SIG_IGN){
2236
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2237
if(ret == -1){
2238
perror_plus("sigaction");
2239
exitcode = EX_OSERR;
2240
goto end;
2241
}
2242
}
2243
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2244
if(ret == -1){
2245
perror_plus("sigaction");
2246
return EX_OSERR;
2247
}
2248
if(old_sigterm_action.sa_handler != SIG_IGN){
2249
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2250
if(ret == -1){
2251
perror_plus("sigaction");
2252
exitcode = EX_OSERR;
2253
goto end;
2254
}
2255
}
2256
2257
/* If no interfaces were specified, make a list */
2258
if(mc.interfaces == NULL){
2259
struct dirent **direntries = NULL;
2260
/* Look for any good interfaces */
2261
ret = scandir(sys_class_net, &direntries, good_interface,
2262
alphasort);
2263
if(ret >= 1){
2264
/* Add all found interfaces to interfaces list */
2265
for(int i = 0; i < ret; ++i){
2266
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2267
direntries[i]->d_name);
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("argz_add");
2271
continue;
2272
}
2273
if(debug){
2274
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
direntries[i]->d_name);
2276
}
2277
}
2278
free(direntries);
2279
} else {
2280
if(ret == 0){
2281
free(direntries);
2282
}
2283
fprintf_plus(stderr, "Could not find a network interface\n");
2284
exitcode = EXIT_FAILURE;
2285
goto end;
2286
}
2287
}
2288
2289
/* Bring up interfaces which are down, and remove any "none"s */
2290
{
2291
char *interface = NULL;
2292
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2293
interface))){
2294
/* If interface name is "none", stop bringing up interfaces.
2295
Also remove all instances of "none" from the list */
2296
if(strcmp(interface, "none") == 0){
2297
argz_delete(&mc.interfaces, &mc.interfaces_size,
2298
interface);
2299
interface = NULL;
2300
while((interface = argz_next(mc.interfaces,
2301
mc.interfaces_size, interface))){
2302
if(strcmp(interface, "none") == 0){
2303
argz_delete(&mc.interfaces, &mc.interfaces_size,
2304
interface);
2305
interface = NULL;
2306
}
2307
}
2308
break;
2309
}
2310
bool interface_was_up = interface_is_up(interface);
2311
errno = bring_up_interface(interface, delay);
2312
if(not interface_was_up){
2313
if(errno != 0){
2314
perror_plus("Failed to bring up interface");
2315
} else {
2316
errno = argz_add(&interfaces_to_take_down,
2317
&interfaces_to_take_down_size,
2318
interface);
2319
if(errno != 0){
2320
perror_plus("argz_add");
2321
}
2322
}
2323
}
2324
}
2325
if(debug and (interfaces_to_take_down == NULL)){
2326
fprintf_plus(stderr, "No interfaces were brought up\n");
2327
}
2328
}
2329
2330
/* If we only got one interface, explicitly use only that one */
2331
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
1086
2332
if(debug){
1087
fprintf(stderr, "Starting Avahi loop search\n");
1088
}
1089
1090
avahi_simple_poll_loop(mc.simple_poll);
1091
2333
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2334
mc.interfaces);
2335
}
2336
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2337
}
2338
2339
if(quit_now){
2340
goto end;
2341
}
2342
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
2344
if(ret == -1){
2345
fprintf_plus(stderr, "init_gnutls_global failed\n");
2346
exitcode = EX_UNAVAILABLE;
2347
goto end;
2348
} else {
2349
gnutls_initialized = true;
2350
}
2351
2352
if(quit_now){
2353
goto end;
2354
}
2355
2356
/* Try /run/tmp before /tmp */
2357
tempdir = mkdtemp(run_tempdir);
2358
if(tempdir == NULL and errno == ENOENT){
2359
if(debug){
2360
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2361
run_tempdir, old_tempdir);
2362
}
2363
tempdir = mkdtemp(old_tempdir);
2364
}
2365
if(tempdir == NULL){
2366
perror_plus("mkdtemp");
2367
goto end;
2368
}
2369
2370
if(quit_now){
2371
goto end;
2372
}
2373
2374
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2375
fprintf_plus(stderr, "init_gpgme failed\n");
2376
exitcode = EX_UNAVAILABLE;
2377
goto end;
2378
} else {
2379
gpgme_initialized = true;
2380
}
2381
2382
if(quit_now){
2383
goto end;
2384
}
2385
2386
if(connect_to != NULL){
2387
/* Connect directly, do not use Zeroconf */
2388
/* (Mainly meant for debugging) */
2389
char *address = strrchr(connect_to, ':');
2390
2391
if(address == NULL){
2392
fprintf_plus(stderr, "No colon in address\n");
2393
exitcode = EX_USAGE;
2394
goto end;
2395
}
2396
2397
if(quit_now){
2398
goto end;
2399
}
2400
2401
in_port_t port;
2402
errno = 0;
2403
tmpmax = strtoimax(address+1, &tmp, 10);
2404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2405
or tmpmax != (in_port_t)tmpmax){
2406
fprintf_plus(stderr, "Bad port number\n");
2407
exitcode = EX_USAGE;
2408
goto end;
2409
}
2410
2411
if(quit_now){
2412
goto end;
2413
}
2414
2415
port = (in_port_t)tmpmax;
2416
*address = '\0';
2417
/* Colon in address indicates IPv6 */
2418
int af;
2419
if(strchr(connect_to, ':') != NULL){
2420
af = AF_INET6;
2421
/* Accept [] around IPv6 address - see RFC 5952 */
2422
if(connect_to[0] == '[' and address[-1] == ']')
2423
{
2424
connect_to++;
2425
address[-1] = '\0';
2426
}
2427
} else {
2428
af = AF_INET;
2429
}
2430
address = connect_to;
2431
2432
if(quit_now){
2433
goto end;
2434
}
2435
2436
while(not quit_now){
2437
ret = start_mandos_communication(address, port, if_index, af,
2438
&mc);
2439
if(quit_now or ret == 0){
2440
break;
2441
}
2442
if(debug){
2443
fprintf_plus(stderr, "Retrying in %d seconds\n",
2444
(int)retry_interval);
2445
}
2446
sleep((unsigned int)retry_interval);
2447
}
2448
2449
if(not quit_now){
2450
exitcode = EXIT_SUCCESS;
2451
}
2452
2453
goto end;
2454
}
2455
2456
if(quit_now){
2457
goto end;
2458
}
2459
2460
{
2461
AvahiServerConfig config;
2462
/* Do not publish any local Zeroconf records */
2463
avahi_server_config_init(&config);
2464
config.publish_hinfo = 0;
2465
config.publish_addresses = 0;
2466
config.publish_workstation = 0;
2467
config.publish_domain = 0;
2468
2469
/* Allocate a new server */
2470
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
2472
2473
/* Free the Avahi configuration data */
2474
avahi_server_config_free(&config);
2475
}
2476
2477
/* Check if creating the Avahi server object succeeded */
2478
if(mc.server == NULL){
2479
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
2481
exitcode = EX_UNAVAILABLE;
2482
goto end;
2483
}
2484
2485
if(quit_now){
2486
goto end;
2487
}
2488
2489
/* Create the Avahi service browser */
2490
sb = avahi_s_service_browser_new(mc.server, if_index,
2491
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2492
NULL, 0, browse_callback,
2493
(void *)&mc);
2494
if(sb == NULL){
2495
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2496
avahi_strerror(avahi_server_errno(mc.server)));
2497
exitcode = EX_UNAVAILABLE;
2498
goto end;
2499
}
2500
2501
if(quit_now){
2502
goto end;
2503
}
2504
2505
/* Run the main loop */
2506
2507
if(debug){
2508
fprintf_plus(stderr, "Starting Avahi loop search\n");
2509
}
2510
2511
ret = avahi_loop_with_timeout(simple_poll,
2512
(int)(retry_interval * 1000), &mc);
2513
if(debug){
2514
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2515
(ret == 0) ? "successfully" : "with error");
2516
}
2517
1092
2518
end:
1093
1094
if(debug){
1095
fprintf(stderr, "%s exiting\n", argv[0]);
1096
}
1097
1098
/* Cleanup things */
1099
if(sb != NULL)
1100
avahi_s_service_browser_free(sb);
1101
1102
if(mc.server != NULL)
1103
avahi_server_free(mc.server);
1104
1105
if(mc.simple_poll != NULL)
1106
avahi_simple_poll_free(mc.simple_poll);
1107
1108
if(gnutls_initalized){
1109
gnutls_certificate_free_credentials(mc.cred);
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1112
}
1113
1114
if(gpgme_initalized){
1115
gpgme_release(mc.ctx);
1116
}
1117
1118
/* Removes the temp directory used by GPGME */
1119
if(tempdir[0] != '\0'){
1120
DIR *d;
1121
struct dirent *direntry;
1122
d = opendir(tempdir);
1123
if(d == NULL){
1124
if(errno != ENOENT){
1125
perror("opendir");
1126
}
1127
} else {
1128
while(true){
1129
direntry = readdir(d);
1130
if(direntry == NULL){
1131
break;
1132
}
1133
if(direntry->d_type == DT_REG){
1134
char *fullname = NULL;
1135
ret = asprintf(&fullname, "%s/%s", tempdir,
1136
direntry->d_name);
1137
if(ret < 0){
1138
perror("asprintf");
1139
continue;
1140
}
1141
ret = unlink(fullname);
1142
if(ret == -1){
1143
fprintf(stderr, "unlink(\"%s\"): %s",
1144
fullname, strerror(errno));
1145
}
1146
free(fullname);
1147
}
1148
}
1149
closedir(d);
1150
}
1151
ret = rmdir(tempdir);
1152
if(ret == -1 and errno != ENOENT){
1153
perror("rmdir");
1154
}
1155
}
1156
1157
return exitcode;
2519
2520
if(debug){
2521
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2522
}
2523
2524
/* Cleanup things */
2525
free(mc.interfaces);
2526
2527
if(sb != NULL)
2528
avahi_s_service_browser_free(sb);
2529
2530
if(mc.server != NULL)
2531
avahi_server_free(mc.server);
2532
2533
if(simple_poll != NULL)
2534
avahi_simple_poll_free(simple_poll);
2535
2536
if(gnutls_initialized){
2537
gnutls_certificate_free_credentials(mc.cred);
2538
gnutls_global_deinit();
2539
gnutls_dh_params_deinit(mc.dh_params);
2540
}
2541
2542
if(gpgme_initialized){
2543
gpgme_release(mc.ctx);
2544
}
2545
2546
/* Cleans up the circular linked list of Mandos servers the client
2547
has seen */
2548
if(mc.current_server != NULL){
2549
mc.current_server->prev->next = NULL;
2550
while(mc.current_server != NULL){
2551
server *next = mc.current_server->next;
2552
free(mc.current_server);
2553
mc.current_server = next;
2554
}
2555
}
2556
2557
/* Re-raise privileges */
2558
{
2559
ret_errno = raise_privileges();
2560
if(ret_errno != 0){
2561
errno = ret_errno;
2562
perror_plus("Failed to raise privileges");
2563
} else {
2564
2565
/* Run network hooks */
2566
run_network_hooks("stop", interfaces_hooks != NULL ?
2567
interfaces_hooks : "", delay);
2568
2569
/* Take down the network interfaces which were brought up */
2570
{
2571
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2574
interface))){
2575
ret_errno = take_down_interface(interface);
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to take down interface");
2579
}
2580
}
2581
if(debug and (interfaces_to_take_down == NULL)){
2582
fprintf_plus(stderr, "No interfaces needed to be taken"
2583
" down\n");
2584
}
2585
}
2586
}
2587
2588
ret_errno = lower_privileges_permanently();
2589
if(ret_errno != 0){
2590
errno = ret_errno;
2591
perror_plus("Failed to lower privileges permanently");
2592
}
2593
}
2594
2595
free(interfaces_to_take_down);
2596
free(interfaces_hooks);
2597
2598
/* Removes the GPGME temp directory and all files inside */
2599
if(tempdir != NULL){
2600
struct dirent **direntries = NULL;
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2602
O_NOFOLLOW));
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2605
} else {
2606
#ifdef __GLIBC__
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2616
alphasort);
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2621
if(ret == -1){
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2625
}
2626
}
2627
2628
/* need to clean even if 0 because man page doesn't specify */
2629
free(direntries);
2630
if(numentries == -1){
2631
perror_plus("scandir");
2632
}
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
2636
}
2637
}
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
2639
}
2640
}
2641
2642
if(quit_now){
2643
sigemptyset(&old_sigterm_action.sa_mask);
2644
old_sigterm_action.sa_handler = SIG_DFL;
2645
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2646
&old_sigterm_action,
2647
NULL));
2648
if(ret == -1){
2649
perror_plus("sigaction");
2650
}
2651
do {
2652
ret = raise(signal_received);
2653
} while(ret != 0 and errno == EINTR);
2654
if(ret != 0){
2655
perror_plus("raise");
2656
abort();
2657
}
2658
TEMP_FAILURE_RETRY(pause());
2659
}
2660
2661
return exitcode;
1158
2662
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0