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- Committer: Björn Påhlsson
- Date: 2011-11-28 07:39:48 UTC
- mfrom: (505.3.16 client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: belorn@recompile.se-20111128073948-xd69945uliwv2y61
merge
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
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
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
49
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
53
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
55
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
57
connect() */
58
inet_pton(), connect() */
58
59
#include <fcntl.h> /* open() */
59
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
61
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
62
64
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
69
SIOCSIFFLAGS, if_indextoname(),
67
70
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
78
92
#ifdef __linux__
79
93
#include <sys/klog.h> /* klogctl() */
80
#endif
94
#endif /* __linux__ */
81
95
82
96
/* Avahi */
83
97
/* All Avahi types, constants and functions
97
111
init_gnutls_session(),
98
112
GNUTLS_* */
99
113
#include <gnutls/openpgp.h>
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
102
116
103
117
/* GPGME */
104
118
#include <gpgme.h> /* All GPGME types, constants and
112
126
#define PATHDIR "/conf/conf.d/mandos"
113
127
#define SECKEY "seckey.txt"
114
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
115
130
116
131
bool debug = false;
117
132
static const char mandos_protocol_version[] = "1";
118
133
const char *argp_program_version = "mandos-client " VERSION;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
120
149
121
150
/* Used for passing in values through the Avahi callback functions */
122
151
typedef struct {
127
156
gnutls_dh_params_t dh_params;
128
157
const char *priority;
129
158
gpgme_ctx_t ctx;
159
server *current_server;
130
160
} mandos_context;
131
161
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
132
187
/*
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
189
* bytes. "buffer_capacity" is how much is currently allocated,
135
190
* "buffer_length" is how much is already used.
136
191
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
192
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
139
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
141
196
if(buffer == NULL){
146
201
return buffer_capacity;
147
202
}
148
203
204
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return -1;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return -1;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
239
}
240
149
241
/*
150
242
* Initialize GPGME.
151
243
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
155
246
gpgme_error_t rc;
156
247
gpgme_engine_info_t engine_info;
157
248
160
251
* Helper function to insert pub and seckey to the engine keyring.
161
252
*/
162
253
bool import_key(const char *filename){
254
int ret;
163
255
int fd;
164
256
gpgme_data_t pgp_data;
165
257
166
258
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
167
259
if(fd == -1){
168
perror("open");
260
perror_plus("open");
169
261
return false;
170
262
}
171
263
172
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
173
265
if(rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
176
268
return false;
177
269
}
178
270
179
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
180
272
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
183
275
return false;
184
276
}
185
277
186
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
187
279
if(ret == -1){
188
perror("close");
280
perror_plus("close");
189
281
}
190
282
gpgme_data_release(pgp_data);
191
283
return true;
192
284
}
193
285
194
286
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
287
fprintf_plus(stderr, "Initializing GPGME\n");
196
288
}
197
289
198
290
/* Init GPGME */
199
291
gpgme_check_version(NULL);
200
292
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
201
293
if(rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
204
296
return false;
205
297
}
206
298
207
/* Set GPGME home directory for the OpenPGP engine only */
299
/* Set GPGME home directory for the OpenPGP engine only */
208
300
rc = gpgme_get_engine_info(&engine_info);
209
301
if(rc != GPG_ERR_NO_ERROR){
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
212
304
return false;
213
305
}
214
306
while(engine_info != NULL){
220
312
engine_info = engine_info->next;
221
313
}
222
314
if(engine_info == NULL){
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
224
317
return false;
225
318
}
226
319
227
320
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
229
322
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
232
326
return false;
233
327
}
234
328
236
330
return false;
237
331
}
238
332
239
return true;
333
return true;
240
334
}
241
335
242
336
/*
243
337
* Decrypt OpenPGP data.
244
338
* Returns -1 on error
245
339
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
341
size_t crypto_size,
249
342
char **plaintext){
250
343
gpgme_data_t dh_crypto, dh_plain;
254
347
ssize_t plaintext_length = 0;
255
348
256
349
if(debug){
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
258
351
}
259
352
260
353
/* Create new GPGME data buffer from memory cryptotext */
261
354
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
262
355
0);
263
356
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
266
359
return -1;
267
360
}
268
361
269
362
/* Create new empty GPGME data buffer for the plaintext */
270
363
rc = gpgme_data_new(&dh_plain);
271
364
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
274
368
gpgme_data_release(dh_crypto);
275
369
return -1;
276
370
}
277
371
278
372
/* Decrypt data from the cryptotext data buffer to the plaintext
279
373
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
375
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
284
378
plaintext_length = -1;
285
379
if(debug){
286
380
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
288
382
if(result == NULL){
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
290
384
} else {
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
295
389
if(result->file_name != NULL){
296
fprintf(stderr, "File name: %s\n", result->file_name);
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
297
391
}
298
392
gpgme_recipient_t recipient;
299
393
recipient = result->recipients;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
394
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
402
recipient = recipient->next;
310
403
}
311
404
}
312
405
}
314
407
}
315
408
316
409
if(debug){
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
318
411
}
319
412
320
413
/* Seek back to the beginning of the GPGME plaintext data buffer */
321
414
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
322
perror("gpgme_data_seek");
415
perror_plus("gpgme_data_seek");
323
416
plaintext_length = -1;
324
417
goto decrypt_end;
325
418
}
326
419
327
420
*plaintext = NULL;
328
421
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
422
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
424
plaintext_capacity);
332
425
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
336
429
}
337
430
338
431
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
343
436
break;
344
437
}
345
438
if(ret < 0){
346
perror("gpgme_data_read");
439
perror_plus("gpgme_data_read");
347
440
plaintext_length = -1;
348
441
goto decrypt_end;
349
442
}
351
444
}
352
445
353
446
if(debug){
354
fprintf(stderr, "Decrypted password is: ");
447
fprintf_plus(stderr, "Decrypted password is: ");
355
448
for(ssize_t i = 0; i < plaintext_length; i++){
356
449
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
357
450
}
379
472
/* GnuTLS log function callback */
380
473
static void debuggnutls(__attribute__((unused)) int level,
381
474
const char* string){
382
fprintf(stderr, "GnuTLS: %s", string);
475
fprintf_plus(stderr, "GnuTLS: %s", string);
383
476
}
384
477
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
478
static int init_gnutls_global(const char *pubkeyfilename,
387
479
const char *seckeyfilename){
388
480
int ret;
389
481
390
482
if(debug){
391
fprintf(stderr, "Initializing GnuTLS\n");
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
392
484
}
393
485
394
486
ret = gnutls_global_init();
395
487
if(ret != GNUTLS_E_SUCCESS){
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
398
490
return -1;
399
491
}
400
492
407
499
}
408
500
409
501
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
411
503
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
417
506
gnutls_global_deinit();
418
507
return -1;
419
508
}
420
509
421
510
if(debug){
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
425
515
}
426
516
427
517
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
429
519
GNUTLS_OPENPGP_FMT_BASE64);
430
520
if(ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
436
526
goto globalfail;
437
527
}
438
528
439
529
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
441
531
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
444
535
goto globalfail;
445
536
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
538
if(ret != GNUTLS_E_SUCCESS){
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
450
541
goto globalfail;
451
542
}
452
543
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
545
455
546
return 0;
456
547
457
548
globalfail:
458
549
459
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
460
551
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
462
553
return -1;
463
554
}
464
555
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
556
static int init_gnutls_session(gnutls_session_t *session){
467
557
int ret;
468
558
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
559
do {
560
ret = gnutls_init(session, GNUTLS_SERVER);
561
if(quit_now){
562
return -1;
563
}
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
565
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
473
569
}
474
570
475
571
{
476
572
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
575
if(quit_now){
576
gnutls_deinit(*session);
577
return -1;
578
}
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
580
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
482
584
gnutls_deinit(*session);
483
585
return -1;
484
586
}
485
587
}
486
588
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
589
do {
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
592
if(quit_now){
593
gnutls_deinit(*session);
594
return -1;
595
}
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
489
597
if(ret != GNUTLS_E_SUCCESS){
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
492
600
gnutls_deinit(*session);
493
601
return -1;
494
602
}
495
603
496
604
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
606
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
608
502
609
return 0;
503
610
}
509
616
/* Called when a Mandos server is found */
510
617
static int start_mandos_communication(const char *ip, uint16_t port,
511
618
AvahiIfIndex if_index,
512
mandos_context *mc){
513
int ret, tcp_sd;
619
int af){
620
int ret, tcp_sd = -1;
514
621
ssize_t sret;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
516
626
char *buffer = NULL;
517
char *decrypted_buffer;
627
char *decrypted_buffer = NULL;
518
628
size_t buffer_length = 0;
519
629
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
521
630
size_t written;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
631
int retval = -1;
524
632
gnutls_session_t session;
525
526
ret = init_gnutls_session(mc, &session);
633
int pf; /* Protocol family */
634
635
errno = 0;
636
637
if(quit_now){
638
errno = EINTR;
639
return -1;
640
}
641
642
switch(af){
643
case AF_INET6:
644
pf = PF_INET6;
645
break;
646
case AF_INET:
647
pf = PF_INET;
648
break;
649
default:
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
651
errno = EINVAL;
652
return -1;
653
}
654
655
ret = init_gnutls_session(&session);
527
656
if(ret != 0){
528
657
return -1;
529
658
}
530
659
531
660
if(debug){
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
533
"\n", ip, port);
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
534
663
}
535
664
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
537
666
if(tcp_sd < 0){
538
perror("socket");
539
return -1;
667
int e = errno;
668
perror_plus("socket");
669
errno = e;
670
goto mandos_end;
540
671
}
541
672
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
673
if(quit_now){
674
errno = EINTR;
675
goto mandos_end;
548
676
}
549
677
550
678
memset(&to, 0, sizeof(to));
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
679
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
682
} else { /* IPv4 */
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
685
}
555
686
if(ret < 0 ){
556
perror("inet_pton");
557
return -1;
687
int e = errno;
688
perror_plus("inet_pton");
689
errno = e;
690
goto mandos_end;
558
691
}
559
692
if(ret == 0){
560
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
693
int e = errno;
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
695
errno = e;
696
goto mandos_end;
562
697
}
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
698
if(af == AF_INET6){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
706
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
709
errno = EINVAL;
710
goto mandos_end;
711
}
712
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
714
}
715
} else {
716
to.in.sin_port = htons(port); /* Spurious warnings from
564
717
-Wconversion and
565
718
-Wunreachable-code */
719
}
566
720
567
to.in6.sin6_scope_id = (uint32_t)if_index;
721
if(quit_now){
722
errno = EINTR;
723
goto mandos_end;
724
}
568
725
569
726
if(debug){
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
575
perror("inet_ntop");
727
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
728
char interface[IF_NAMESIZE];
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
perror_plus("if_indextoname");
731
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
734
}
735
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
738
}
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
576
751
} else {
577
752
if(strcmp(addrstr, ip) != 0){
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
579
754
}
580
755
}
581
756
}
582
757
583
ret = connect(tcp_sd, &to.in, sizeof(to));
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
584
768
if(ret < 0){
585
perror("connect");
586
return -1;
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
587
780
}
588
781
589
782
const char *out = mandos_protocol_version;
591
784
while(true){
592
785
size_t out_size = strlen(out);
593
786
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
594
out_size - written));
787
out_size - written));
595
788
if(ret == -1){
596
perror("write");
597
retval = -1;
789
int e = errno;
790
perror_plus("write");
791
errno = e;
598
792
goto mandos_end;
599
793
}
600
794
written += (size_t)ret;
608
802
break;
609
803
}
610
804
}
805
806
if(quit_now){
807
errno = EINTR;
808
goto mandos_end;
809
}
611
810
}
612
811
613
812
if(debug){
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
}
616
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
814
}
815
816
if(quit_now){
817
errno = EINTR;
818
goto mandos_end;
819
}
820
821
/* Spurious warning from -Wint-to-pointer-cast */
617
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
618
823
619
do{
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
828
829
do {
620
830
ret = gnutls_handshake(session);
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
621
835
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
622
836
623
837
if(ret != GNUTLS_E_SUCCESS){
624
838
if(debug){
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
626
840
gnutls_perror(ret);
627
841
}
628
retval = -1;
842
errno = EPROTO;
629
843
goto mandos_end;
630
844
}
631
845
632
846
/* Read OpenPGP packet that contains the wanted password */
633
847
634
848
if(debug){
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
636
ip);
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
637
851
}
638
852
639
853
while(true){
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
641
buffer_capacity);
854
855
if(quit_now){
856
errno = EINTR;
857
goto mandos_end;
858
}
859
860
buffer_capacity = incbuffer(&buffer, buffer_length,
861
buffer_capacity);
642
862
if(buffer_capacity == 0){
643
perror("adjustbuffer");
644
retval = -1;
863
int e = errno;
864
perror_plus("incbuffer");
865
errno = e;
866
goto mandos_end;
867
}
868
869
if(quit_now){
870
errno = EINTR;
645
871
goto mandos_end;
646
872
}
647
873
656
882
case GNUTLS_E_AGAIN:
657
883
break;
658
884
case GNUTLS_E_REHANDSHAKE:
659
do{
885
do {
660
886
ret = gnutls_handshake(session);
887
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
661
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
662
893
if(ret < 0){
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
664
896
gnutls_perror(ret);
665
retval = -1;
897
errno = EPROTO;
666
898
goto mandos_end;
667
899
}
668
900
break;
669
901
default:
670
fprintf(stderr, "Unknown error while reading data from"
671
" encrypted session with Mandos server\n");
672
retval = -1;
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
673
904
gnutls_bye(session, GNUTLS_SHUT_RDWR);
905
errno = EIO;
674
906
goto mandos_end;
675
907
}
676
908
} else {
679
911
}
680
912
681
913
if(debug){
682
fprintf(stderr, "Closing TLS session\n");
683
}
684
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
914
fprintf_plus(stderr, "Closing TLS session\n");
915
}
916
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
do {
923
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
686
929
687
930
if(buffer_length > 0){
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
689
buffer_length,
931
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
690
933
&decrypted_buffer);
691
934
if(decrypted_buffer_size >= 0){
935
692
936
written = 0;
693
937
while(written < (size_t) decrypted_buffer_size){
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
694
943
ret = (int)fwrite(decrypted_buffer + written, 1,
695
944
(size_t)decrypted_buffer_size - written,
696
945
stdout);
697
946
if(ret == 0 and ferror(stdout)){
947
int e = errno;
698
948
if(debug){
699
fprintf(stderr, "Error writing encrypted data: %s\n",
700
strerror(errno));
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
701
951
}
702
retval = -1;
703
break;
952
errno = e;
953
goto mandos_end;
704
954
}
705
955
written += (size_t)ret;
706
956
}
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
957
retval = 0;
710
958
}
711
} else {
712
retval = -1;
713
959
}
714
960
715
961
/* Shutdown procedure */
716
962
717
963
mandos_end:
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
964
{
965
int e = errno;
966
free(decrypted_buffer);
967
free(buffer);
968
if(tcp_sd >= 0){
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
970
}
971
if(ret == -1){
972
if(e == 0){
973
e = errno;
974
}
975
perror_plus("close");
976
}
977
gnutls_deinit(session);
978
errno = e;
979
if(quit_now){
980
errno = EINTR;
981
retval = -1;
982
}
722
983
}
723
gnutls_deinit(session);
724
984
return retval;
725
985
}
726
986
727
987
static void resolve_callback(AvahiSServiceResolver *r,
728
988
AvahiIfIndex interface,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
989
AvahiProtocol proto,
730
990
AvahiResolverEvent event,
731
991
const char *name,
732
992
const char *type,
737
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
738
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
739
999
flags,
740
void* userdata){
741
mandos_context *mc = userdata;
1000
AVAHI_GCC_UNUSED void* userdata){
742
1001
assert(r);
743
1002
744
1003
/* Called whenever a service has been resolved successfully or
745
1004
timed out */
746
1005
1006
if(quit_now){
1007
return;
1008
}
1009
747
1010
switch(event){
748
1011
default:
749
1012
case AVAHI_RESOLVER_FAILURE:
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
752
avahi_strerror(avahi_server_errno(mc->server)));
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
753
1017
break;
754
1018
755
1019
case AVAHI_RESOLVER_FOUND:
757
1021
char ip[AVAHI_ADDRESS_STR_MAX];
758
1022
avahi_address_snprint(ip, sizeof(ip), address);
759
1023
if(debug){
760
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
ip, (intmax_t)interface, port);
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
763
1027
}
764
int ret = start_mandos_communication(ip, port, interface, mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
765
1030
if(ret == 0){
766
avahi_simple_poll_quit(mc->simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1032
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
767
1035
}
768
1036
}
769
1037
}
779
1047
const char *domain,
780
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
781
1049
flags,
782
void* userdata){
783
mandos_context *mc = userdata;
1050
AVAHI_GCC_UNUSED void* userdata){
784
1051
assert(b);
785
1052
786
1053
/* Called whenever a new services becomes available on the LAN or
787
1054
is removed from the LAN */
788
1055
1056
if(quit_now){
1057
return;
1058
}
1059
789
1060
switch(event){
790
1061
default:
791
1062
case AVAHI_BROWSER_FAILURE:
792
1063
793
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
796
1067
return;
797
1068
798
1069
case AVAHI_BROWSER_NEW:
801
1072
the callback function is called the Avahi server will free the
802
1073
resolver for us. */
803
1074
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
810
1081
break;
811
1082
812
1083
case AVAHI_BROWSER_REMOVE:
815
1086
case AVAHI_BROWSER_ALL_FOR_NOW:
816
1087
case AVAHI_BROWSER_CACHE_EXHAUSTED:
817
1088
if(debug){
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
819
1091
}
820
1092
break;
821
1093
}
822
1094
}
823
1095
1096
/* Signal handler that stops main loop after SIGTERM */
1097
static void handle_sigterm(int sig){
1098
if(quit_now){
1099
return;
1100
}
1101
quit_now = 1;
1102
signal_received = sig;
1103
int old_errno = errno;
1104
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1107
}
1108
errno = old_errno;
1109
}
1110
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
1122
if(debug){
1123
perror_plus("ioctl SIOCGIFFLAGS");
1124
}
1125
return false;
1126
}
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1132
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1134
if(debug){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1137
}
1138
return false;
1139
}
1140
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1142
if(debug){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1145
}
1146
return true;
1147
}
1148
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1150
if(debug){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1153
}
1154
return false;
1155
}
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1158
if(debug){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1161
}
1162
return false;
1163
}
1164
1165
/* Accept this device */
1166
if(debug){
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
int ret;
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1317
1318
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1323
}
1324
ret = avahi_simple_poll_iterate(s, -1);
1325
} else {
1326
if (debug){
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1329
}
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1332
if(ret == -1){
1333
perror_plus("clock_gettime");
1334
return -1;
1335
}
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1349
if (debug){
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1352
}
1353
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1359
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1361
return 0;
1362
}
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1372
}
1373
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
}
1376
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1379
}
1380
}
1381
}
1382
}
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1437
close(devnull);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1440
if(ret == -1){
1441
perror_plus("setenv");
1442
_exit(EX_OSERR);
1443
}
1444
ret = setenv("DEVICE", interface, 1);
1445
if(ret == -1){
1446
perror_plus("setenv");
1447
_exit(EX_OSERR);
1448
}
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1450
if(ret == -1){
1451
perror_plus("setenv");
1452
_exit(EX_OSERR);
1453
}
1454
ret = setenv("MODE", mode, 1);
1455
if(ret == -1){
1456
perror_plus("setenv");
1457
_exit(EX_OSERR);
1458
}
1459
char *delaystring;
1460
ret = asprintf(&delaystring, "%f", delay);
1461
if(ret == -1){
1462
perror_plus("asprintf");
1463
_exit(EX_OSERR);
1464
}
1465
ret = setenv("DELAY", delaystring, 1);
1466
if(ret == -1){
1467
free(delaystring);
1468
perror_plus("setenv");
1469
_exit(EX_OSERR);
1470
}
1471
free(delaystring);
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1474
} else {
1475
int status;
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1478
free(fullname);
1479
continue;
1480
}
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1492
WTERMSIG(status));
1493
free(fullname);
1494
continue;
1495
} else {
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1498
free(fullname);
1499
continue;
1500
}
1501
}
1502
free(fullname);
1503
if(debug){
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1505
direntry->d_name);
1506
}
1507
}
1508
close(devnull);
1509
}
1510
return true;
1511
}
1512
824
1513
int main(int argc, char *argv[]){
825
1514
AvahiSServiceBrowser *sb = NULL;
826
1515
int error;
827
1516
int ret;
828
1517
intmax_t tmpmax;
829
int numchars;
1518
char *tmp;
830
1519
int exitcode = EXIT_SUCCESS;
831
const char *interface = "eth0";
1520
const char *interface = "";
832
1521
struct ifreq network;
833
int sd;
1522
int sd = -1;
1523
bool take_down_interface = false;
834
1524
uid_t uid;
835
1525
gid_t gid;
836
char *connect_to = NULL;
837
1526
char tempdir[] = "/tmp/mandosXXXXXX";
838
1527
bool tempdir_created = false;
839
1528
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
840
1529
const char *seckey = PATHDIR "/" SECKEY;
841
1530
const char *pubkey = PATHDIR "/" PUBKEY;
842
1531
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
846
1532
bool gnutls_initialized = false;
847
1533
bool gpgme_initialized = false;
848
double delay = 2.5;
1534
float delay = 2.5f;
1535
double retry_interval = 10; /* 10s between trying a server and
1536
retrying the same server again */
1537
1538
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1539
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1540
1541
uid = getuid();
1542
gid = getgid();
1543
1544
/* Lower any group privileges we might have, just to be safe */
1545
errno = 0;
1546
ret = setgid(gid);
1547
if(ret == -1){
1548
perror_plus("setgid");
1549
}
1550
1551
/* Lower user privileges (temporarily) */
1552
errno = 0;
1553
ret = seteuid(uid);
1554
if(ret == -1){
1555
perror_plus("seteuid");
1556
}
1557
1558
if(quit_now){
1559
goto end;
1560
}
849
1561
850
1562
{
851
1563
struct argp_option options[] = {
857
1569
.group = 1 },
858
1570
{ .name = "interface", .key = 'i',
859
1571
.arg = "NAME",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1572
.doc = "Network interface that will be used to search for"
1573
" Mandos servers",
862
1574
.group = 1 },
863
1575
{ .name = "seckey", .key = 's',
864
1576
.arg = "FILE",
881
1593
.arg = "SECONDS",
882
1594
.doc = "Maximum delay to wait for interface startup",
883
1595
.group = 2 },
1596
{ .name = "retry", .key = 132,
1597
.arg = "SECONDS",
1598
.doc = "Retry interval used when denied by the mandos server",
1599
.group = 2 },
1600
{ .name = "network-hook-dir", .key = 133,
1601
.arg = "DIR",
1602
.doc = "Directory where network hooks are located",
1603
.group = 2 },
1604
/*
1605
* These reproduce what we would get without ARGP_NO_HELP
1606
*/
1607
{ .name = "help", .key = '?',
1608
.doc = "Give this help list", .group = -1 },
1609
{ .name = "usage", .key = -3,
1610
.doc = "Give a short usage message", .group = -1 },
1611
{ .name = "version", .key = 'V',
1612
.doc = "Print program version", .group = -1 },
884
1613
{ .name = NULL }
885
1614
};
886
1615
887
1616
error_t parse_opt(int key, char *arg,
888
1617
struct argp_state *state){
1618
errno = 0;
889
1619
switch(key){
890
1620
case 128: /* --debug */
891
1621
debug = true;
903
1633
pubkey = arg;
904
1634
break;
905
1635
case 129: /* --dh-bits */
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
910
exit(EXIT_FAILURE);
1636
errno = 0;
1637
tmpmax = strtoimax(arg, &tmp, 10);
1638
if(errno != 0 or tmp == arg or *tmp != '\0'
1639
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1640
argp_error(state, "Bad number of DH bits");
911
1641
}
912
1642
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
913
1643
break;
915
1645
mc.priority = arg;
916
1646
break;
917
1647
case 131: /* --delay */
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
921
exit(EXIT_FAILURE);
922
}
923
break;
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
1648
errno = 0;
1649
delay = strtof(arg, &tmp);
1650
if(errno != 0 or tmp == arg or *tmp != '\0'){
1651
argp_error(state, "Bad delay");
1652
}
1653
case 132: /* --retry */
1654
errno = 0;
1655
retry_interval = strtod(arg, &tmp);
1656
if(errno != 0 or tmp == arg or *tmp != '\0'
1657
or (retry_interval * 1000) > INT_MAX
1658
or retry_interval < 0){
1659
argp_error(state, "Bad retry interval");
1660
}
1661
break;
1662
case 133: /* --network-hook-dir */
1663
hookdir = arg;
1664
break;
1665
/*
1666
* These reproduce what we would get without ARGP_NO_HELP
1667
*/
1668
case '?': /* --help */
1669
argp_state_help(state, state->out_stream,
1670
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1671
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1672
case -3: /* --usage */
1673
argp_state_help(state, state->out_stream,
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1679
exit(argp_err_exit_status);
927
1680
break;
928
1681
default:
929
1682
return ARGP_ERR_UNKNOWN;
930
1683
}
931
return 0;
1684
return errno;
932
1685
}
933
1686
934
1687
struct argp argp = { .options = options, .parser = parse_opt,
935
1688
.args_doc = "",
936
1689
.doc = "Mandos client -- Get and decrypt"
937
1690
" passwords from a Mandos server" };
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
1691
ret = argp_parse(&argp, argc, argv,
1692
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1693
switch(ret){
1694
case 0:
1695
break;
1696
case ENOMEM:
1697
default:
1698
errno = ret;
1699
perror_plus("argp_parse");
1700
exitcode = EX_OSERR;
1701
goto end;
1702
case EINVAL:
1703
exitcode = EX_USAGE;
1704
goto end;
1705
}
1706
}
1707
1708
{
1709
/* Work around Debian bug #633582:
1710
<http://bugs.debian.org/633582> */
1711
1712
/* Re-raise priviliges */
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
} else {
1718
struct stat st;
1719
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1721
int seckey_fd = open(seckey, O_RDONLY);
1722
if(seckey_fd == -1){
1723
perror_plus("open");
1724
} else {
1725
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1726
if(ret == -1){
1727
perror_plus("fstat");
1728
} else {
1729
if(S_ISREG(st.st_mode)
1730
and st.st_uid == 0 and st.st_gid == 0){
1731
ret = fchown(seckey_fd, uid, gid);
1732
if(ret == -1){
1733
perror_plus("fchown");
1734
}
1735
}
1736
}
1737
TEMP_FAILURE_RETRY(close(seckey_fd));
1738
}
1739
}
1740
1741
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1742
int pubkey_fd = open(pubkey, O_RDONLY);
1743
if(pubkey_fd == -1){
1744
perror_plus("open");
1745
} else {
1746
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1747
if(ret == -1){
1748
perror_plus("fstat");
1749
} else {
1750
if(S_ISREG(st.st_mode)
1751
and st.st_uid == 0 and st.st_gid == 0){
1752
ret = fchown(pubkey_fd, uid, gid);
1753
if(ret == -1){
1754
perror_plus("fchown");
1755
}
1756
}
1757
}
1758
TEMP_FAILURE_RETRY(close(pubkey_fd));
1759
}
1760
}
1761
1762
/* Lower privileges */
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
1767
}
1768
}
1769
}
1770
1771
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
1774
}
1775
1776
if(not debug){
1777
avahi_set_log_function(empty_log);
1778
}
1779
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
941
1807
exitcode = EXIT_FAILURE;
942
1808
goto end;
943
1809
}
944
1810
}
945
1811
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
from the signal handler */
1814
/* Initialize the pseudo-RNG for Avahi */
1815
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf_plus(stderr,
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1821
goto end;
1822
}
1823
1824
sigemptyset(&sigterm_action.sa_mask);
1825
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1826
if(ret == -1){
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1829
goto end;
1830
}
1831
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1832
if(ret == -1){
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1835
goto end;
1836
}
1837
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1838
if(ret == -1){
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1841
goto end;
1842
}
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1846
*/
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
return EX_OSERR;
1851
}
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1854
if(ret == -1){
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1857
goto end;
1858
}
1859
}
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1864
}
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1874
if(ret == -1){
1875
perror_plus("sigaction");
1876
return EX_OSERR;
1877
}
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1880
if(ret == -1){
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1883
goto end;
1884
}
1885
}
1886
946
1887
/* If the interface is down, bring it up */
947
{
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1893
goto end;
1894
}
1895
1896
if(quit_now){
1897
goto end;
1898
}
1899
1900
/* Re-raise priviliges */
1901
errno = 0;
1902
ret = seteuid(0);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
948
1907
#ifdef __linux__
949
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
1909
messages about the network interface to mess up the prompt */
951
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
952
1912
if(ret == -1){
953
perror("klogctl");
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
954
1915
}
955
#endif
1916
#endif /* __linux__ */
956
1917
957
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
958
1919
if(sd < 0){
959
perror("socket");
960
exitcode = EXIT_FAILURE;
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
961
1922
#ifdef __linux__
962
ret = klogctl(7, NULL, 0);
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
ret = seteuid(uid);
963
1933
if(ret == -1){
964
perror("klogctl");
1934
perror_plus("seteuid");
965
1935
}
966
#endif
967
1936
goto end;
968
1937
}
969
1938
strcpy(network.ifr_name, interface);
970
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
971
1940
if(ret == -1){
972
perror("ioctl SIOCGIFFLAGS");
1941
perror_plus("ioctl SIOCGIFFLAGS");
973
1942
#ifdef __linux__
974
ret = klogctl(7, NULL, 0);
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1945
if(ret == -1){
1946
perror_plus("klogctl");
1947
}
1948
}
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1952
errno = 0;
1953
ret = seteuid(uid);
975
1954
if(ret == -1){
976
perror("klogctl");
1955
perror_plus("seteuid");
977
1956
}
978
#endif
979
exitcode = EXIT_FAILURE;
980
1957
goto end;
981
1958
}
982
1959
if((network.ifr_flags & IFF_UP) == 0){
983
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
984
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
985
1963
if(ret == -1){
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
988
1967
#ifdef __linux__
989
ret = klogctl(7, NULL, 0);
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1970
if(ret == -1){
1971
perror_plus("klogctl");
1972
}
1973
}
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1976
errno = 0;
1977
ret = seteuid(uid);
990
1978
if(ret == -1){
991
perror("klogctl");
1979
perror_plus("seteuid");
992
1980
}
993
#endif
994
1981
goto end;
995
1982
}
996
1983
}
997
/* sleep checking until interface is running */
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
998
1986
for(int i=0; i < delay * 4; i++){
999
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1000
1988
if(ret == -1){
1001
perror("ioctl SIOCGIFFLAGS");
1989
perror_plus("ioctl SIOCGIFFLAGS");
1002
1990
} else if(network.ifr_flags & IFF_RUNNING){
1003
1991
break;
1004
1992
}
1005
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1006
1994
ret = nanosleep(&sleeptime, NULL);
1007
1995
if(ret == -1 and errno != EINTR){
1008
perror("nanosleep");
1996
perror_plus("nanosleep");
1009
1997
}
1010
1998
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
if(ret == -1){
2003
perror_plus("close");
2004
}
1014
2005
}
1015
2006
#ifdef __linux__
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2010
if(ret == -1){
2011
perror_plus("klogctl");
2012
}
2013
}
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2016
errno = 0;
2017
/* Lower privileges */
2018
ret = seteuid(uid);
1018
2019
if(ret == -1){
1019
perror("klogctl");
2020
perror_plus("seteuid");
1020
2021
}
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1038
if(ret == -1){
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
2022
}
2023
2024
if(quit_now){
2025
goto end;
2026
}
2027
2028
ret = init_gnutls_global(pubkey, seckey);
2029
if(ret == -1){
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
exitcode = EX_UNAVAILABLE;
1041
2032
goto end;
1042
2033
} else {
1043
2034
gnutls_initialized = true;
1044
2035
}
1045
2036
2037
if(quit_now){
2038
goto end;
2039
}
2040
1046
2041
if(mkdtemp(tempdir) == NULL){
1047
perror("mkdtemp");
2042
perror_plus("mkdtemp");
1048
2043
goto end;
1049
2044
}
1050
2045
tempdir_created = true;
1051
2046
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2047
if(quit_now){
2048
goto end;
2049
}
2050
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2053
exitcode = EX_UNAVAILABLE;
1055
2054
goto end;
1056
2055
} else {
1057
2056
gpgme_initialized = true;
1058
2057
}
1059
2058
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
2059
if(quit_now){
1064
2060
goto end;
1065
2061
}
1066
2062
1069
2065
/* (Mainly meant for debugging) */
1070
2066
char *address = strrchr(connect_to, ':');
1071
2067
if(address == NULL){
1072
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
2068
fprintf_plus(stderr, "No colon in address\n");
2069
exitcode = EX_USAGE;
2070
goto end;
2071
}
2072
2073
if(quit_now){
2074
goto end;
2075
}
2076
1076
2077
uint16_t port;
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1080
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
2078
errno = 0;
2079
tmpmax = strtoimax(address+1, &tmp, 10);
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2081
or tmpmax != (uint16_t)tmpmax){
2082
fprintf_plus(stderr, "Bad port number\n");
2083
exitcode = EX_USAGE;
2084
goto end;
2085
}
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
1084
2091
port = (uint16_t)tmpmax;
1085
2092
*address = '\0';
2093
/* Colon in address indicates IPv6 */
2094
int af;
2095
if(strchr(connect_to, ':') != NULL){
2096
af = AF_INET6;
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2099
{
2100
connect_to++;
2101
address[-1] = '\0';
2102
}
2103
} else {
2104
af = AF_INET;
2105
}
1086
2106
address = connect_to;
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1090
} else {
2107
2108
if(quit_now){
2109
goto end;
2110
}
2111
2112
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2114
if(quit_now or ret == 0){
2115
break;
2116
}
2117
if(debug){
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2119
(int)retry_interval);
2120
}
2121
sleep((int)retry_interval);
2122
}
2123
2124
if (not quit_now){
1091
2125
exitcode = EXIT_SUCCESS;
1092
2126
}
2127
1093
2128
goto end;
1094
2129
}
1095
2130
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
2131
if(quit_now){
1108
2132
goto end;
1109
2133
}
1110
2134
1128
2152
1129
2153
/* Check if creating the Avahi server object succeeded */
1130
2154
if(mc.server == NULL){
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
1132
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2156
avahi_strerror(error));
2157
exitcode = EX_UNAVAILABLE;
2158
goto end;
2159
}
2160
2161
if(quit_now){
1134
2162
goto end;
1135
2163
}
1136
2164
1137
2165
/* Create the Avahi service browser */
1138
2166
sb = avahi_s_service_browser_new(mc.server, if_index,
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2168
NULL, 0, browse_callback, NULL);
1141
2169
if(sb == NULL){
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1143
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2171
avahi_strerror(avahi_server_errno(mc.server)));
2172
exitcode = EX_UNAVAILABLE;
2173
goto end;
2174
}
2175
2176
if(quit_now){
1145
2177
goto end;
1146
2178
}
1147
2179
1148
2180
/* Run the main loop */
1149
2181
1150
2182
if(debug){
1151
fprintf(stderr, "Starting Avahi loop search\n");
1152
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2184
}
2185
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2188
if(debug){
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2190
(ret == 0) ? "successfully" : "with error");
2191
}
1155
2192
1156
2193
end:
1157
2194
1158
2195
if(debug){
1159
fprintf(stderr, "%s exiting\n", argv[0]);
2196
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1160
2197
}
1161
2198
1162
2199
/* Cleanup things */
1179
2216
gpgme_release(mc.ctx);
1180
2217
}
1181
2218
1182
/* Removes the temp directory used by GPGME */
2219
/* Cleans up the circular linked list of Mandos servers the client
2220
has seen */
2221
if(mc.current_server != NULL){
2222
mc.current_server->prev->next = NULL;
2223
while(mc.current_server != NULL){
2224
server *next = mc.current_server->next;
2225
free(mc.current_server);
2226
mc.current_server = next;
2227
}
2228
}
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2234
{
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2239
}
2240
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
if(ret == -1){
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
if(ret == -1){
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
}
2252
}
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
if(ret == -1){
2255
perror_plus("close");
2256
}
2257
}
2258
}
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2265
2266
/* Removes the GPGME temp directory and all files inside */
1183
2267
if(tempdir_created){
1184
DIR *d;
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1187
if(d == NULL){
1188
if(errno != ENOENT){
1189
perror("opendir");
1190
}
1191
} else {
1192
while(true){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1195
break;
1196
}
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1202
continue;
1203
}
2268
struct dirent **direntries = NULL;
2269
struct dirent *direntry = NULL;
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
alphasort);
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
2274
direntry = direntries[i];
1204
2275
char *fullname = NULL;
1205
2276
ret = asprintf(&fullname, "%s/%s", tempdir,
1206
2277
direntry->d_name);
1207
2278
if(ret < 0){
1208
perror("asprintf");
2279
perror_plus("asprintf");
1209
2280
continue;
1210
2281
}
1211
2282
ret = remove(fullname);
1212
2283
if(ret == -1){
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1214
strerror(errno));
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2285
strerror(errno));
1215
2286
}
1216
2287
free(fullname);
1217
2288
}
1218
closedir(d);
2289
}
2290
2291
/* need to clean even if 0 because man page doesn't specify */
2292
free(direntries);
2293
if (numentries == -1){
2294
perror_plus("scandir");
1219
2295
}
1220
2296
ret = rmdir(tempdir);
1221
2297
if(ret == -1 and errno != ENOENT){
1222
perror("rmdir");
1223
}
2298
perror_plus("rmdir");
2299
}
2300
}
2301
2302
if(quit_now){
2303
sigemptyset(&old_sigterm_action.sa_mask);
2304
old_sigterm_action.sa_handler = SIG_DFL;
2305
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2306
&old_sigterm_action,
2307
NULL));
2308
if(ret == -1){
2309
perror_plus("sigaction");
2310
}
2311
do {
2312
ret = raise(signal_received);
2313
} while(ret != 0 and errno == EINTR);
2314
if(ret != 0){
2315
perror_plus("raise");
2316
abort();
2317
}
2318
TEMP_FAILURE_RETRY(pause());
1224
2319
}
1225
2320
1226
2321
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0