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- Committer: Teddy Hogeborn
- Date: 2009-09-17 01:21:27 UTC
- Revision ID: teddy@fukt.bsnet.se-20090917012127-4kwzquwuvudwucuv
* debian/control (Standards-Version): Updated to "2.8.3".
* mandos-client.conf.xml (OPTIONS/timeout): Add that a successful
client request will also
reset the timeout.
* mandos.xml (CHECKING): - '' -
* mandos-client.conf.xml (OPTIONS/timeout): Add that a successful
client request will also
reset the timeout.
* mandos.xml (CHECKING): - '' -
- files added:
- debian/watch
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
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() */
43
stdout, ferror(), remove() */
40
44
#include <stdint.h> /* uint16_t, uint32_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
47
srand(), strtof() */
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(), DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
52
56
#include <sys/stat.h> /* open() */
53
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
55
connect() */
58
inet_pton(), connect() */
56
59
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
64
#include <assert.h> /* assert() */
60
65
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
62
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
63
68
SIOCSIFFLAGS, if_indextoname(),
64
69
if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
66
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
67
getuid(), getgid(), setuid(),
74
getuid(), getgid(), seteuid(),
68
75
setgid() */
69
76
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
71
78
#include <argp.h> /* struct argp_option, error_t, struct
72
79
argp_state, struct argp,
73
80
argp_parse(), ARGP_KEY_ARG,
74
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
75
89
76
90
/* Avahi */
77
91
/* All Avahi types, constants and functions
90
104
gnutls_*
91
105
init_gnutls_session(),
92
106
GNUTLS_* */
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
94
109
GNUTLS_OPENPGP_FMT_BASE64 */
95
110
96
111
/* GPGME */
122
137
gpgme_ctx_t ctx;
123
138
} mandos_context;
124
139
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
125
145
/*
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
128
148
* "buffer_length" is how much is already used.
129
149
*/
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
131
151
size_t buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
133
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
134
if (buffer == NULL){
154
if(buffer == NULL){
135
155
return 0;
136
156
}
137
157
buffer_capacity += BUFFER_SIZE;
142
162
/*
143
163
* Initialize GPGME.
144
164
*/
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
165
static bool init_gpgme(const char *seckey,
146
166
const char *pubkey, const char *tempdir){
147
int ret;
148
167
gpgme_error_t rc;
149
168
gpgme_engine_info_t engine_info;
150
169
151
170
152
171
/*
153
* Helper function to insert pub and seckey to the enigne keyring.
172
* Helper function to insert pub and seckey to the engine keyring.
154
173
*/
155
174
bool import_key(const char *filename){
175
int ret;
156
176
int fd;
157
177
gpgme_data_t pgp_data;
158
178
163
183
}
164
184
165
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
166
if (rc != GPG_ERR_NO_ERROR){
186
if(rc != GPG_ERR_NO_ERROR){
167
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
188
gpgme_strsource(rc), gpgme_strerror(rc));
169
189
return false;
170
190
}
171
191
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
174
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
195
gpgme_strsource(rc), gpgme_strerror(rc));
176
196
return false;
184
204
return true;
185
205
}
186
206
187
if (debug){
188
fprintf(stderr, "Initialize gpgme\n");
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
189
209
}
190
210
191
211
/* Init GPGME */
192
212
gpgme_check_version(NULL);
193
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
194
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
195
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
216
gpgme_strsource(rc), gpgme_strerror(rc));
197
217
return false;
198
218
}
199
219
200
220
/* Set GPGME home directory for the OpenPGP engine only */
201
rc = gpgme_get_engine_info (&engine_info);
202
if (rc != GPG_ERR_NO_ERROR){
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
203
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
204
224
gpgme_strsource(rc), gpgme_strerror(rc));
205
225
return false;
218
238
}
219
239
220
240
/* Create new GPGME "context" */
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
223
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
244
gpgme_strsource(rc), gpgme_strerror(rc));
225
245
return false;
226
246
}
227
247
228
if (not import_key(pubkey) or not import_key(seckey)){
248
if(not import_key(pubkey) or not import_key(seckey)){
229
249
return false;
230
250
}
231
251
232
return true;
252
return true;
233
253
}
234
254
235
255
/*
236
256
* Decrypt OpenPGP data.
237
257
* Returns -1 on error
238
258
*/
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
243
262
gpgme_data_t dh_crypto, dh_plain;
244
263
gpgme_error_t rc;
245
264
ssize_t ret;
246
265
size_t plaintext_capacity = 0;
247
266
ssize_t plaintext_length = 0;
248
267
249
if (debug){
268
if(debug){
250
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
251
270
}
252
271
253
272
/* Create new GPGME data buffer from memory cryptotext */
254
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
255
274
0);
256
if (rc != GPG_ERR_NO_ERROR){
275
if(rc != GPG_ERR_NO_ERROR){
257
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
258
277
gpgme_strsource(rc), gpgme_strerror(rc));
259
278
return -1;
261
280
262
281
/* Create new empty GPGME data buffer for the plaintext */
263
282
rc = gpgme_data_new(&dh_plain);
264
if (rc != GPG_ERR_NO_ERROR){
283
if(rc != GPG_ERR_NO_ERROR){
265
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
266
285
gpgme_strsource(rc), gpgme_strerror(rc));
267
286
gpgme_data_release(dh_crypto);
270
289
271
290
/* Decrypt data from the cryptotext data buffer to the plaintext
272
291
data buffer */
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
274
if (rc != GPG_ERR_NO_ERROR){
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
275
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
276
295
gpgme_strsource(rc), gpgme_strerror(rc));
277
296
plaintext_length = -1;
278
if (debug){
297
if(debug){
279
298
gpgme_decrypt_result_t result;
280
result = gpgme_op_decrypt_result(mc->ctx);
281
if (result == NULL){
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
282
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
283
302
} else {
284
303
fprintf(stderr, "Unsupported algorithm: %s\n",
290
309
}
291
310
gpgme_recipient_t recipient;
292
311
recipient = result->recipients;
293
if(recipient){
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
300
? "No" : "Yes");
301
recipient = recipient->next;
302
}
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
303
320
}
304
321
}
305
322
}
311
328
}
312
329
313
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
315
332
perror("gpgme_data_seek");
316
333
plaintext_length = -1;
317
334
goto decrypt_end;
319
336
320
337
*plaintext = NULL;
321
338
while(true){
322
plaintext_capacity = adjustbuffer(plaintext,
339
plaintext_capacity = incbuffer(plaintext,
323
340
(size_t)plaintext_length,
324
341
plaintext_capacity);
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
327
344
plaintext_length = -1;
328
345
goto decrypt_end;
329
346
}
331
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
332
349
BUFFER_SIZE);
333
350
/* Print the data, if any */
334
if (ret == 0){
351
if(ret == 0){
335
352
/* EOF */
336
353
break;
337
354
}
361
378
return plaintext_length;
362
379
}
363
380
364
static const char * safer_gnutls_strerror (int value) {
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
366
if (ret == NULL)
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
367
385
ret = "(unknown)";
368
386
return ret;
369
387
}
374
392
fprintf(stderr, "GnuTLS: %s", string);
375
393
}
376
394
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
395
static int init_gnutls_global(const char *pubkeyfilename,
379
396
const char *seckeyfilename){
380
397
int ret;
381
398
384
401
}
385
402
386
403
ret = gnutls_global_init();
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
390
407
return -1;
391
408
}
392
409
393
if (debug){
410
if(debug){
394
411
/* "Use a log level over 10 to enable all debugging options."
395
412
* - GnuTLS manual
396
413
*/
399
416
}
400
417
401
418
/* OpenPGP credentials */
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
408
427
return -1;
409
428
}
410
429
415
434
}
416
435
417
436
ret = gnutls_certificate_set_openpgp_key_file
418
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
419
438
GNUTLS_OPENPGP_FMT_BASE64);
420
if (ret != GNUTLS_E_SUCCESS) {
439
if(ret != GNUTLS_E_SUCCESS){
421
440
fprintf(stderr,
422
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
446
}
428
447
429
448
/* GnuTLS server initialization */
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
434
453
goto globalfail;
435
454
}
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
440
459
goto globalfail;
441
460
}
442
461
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
444
463
445
464
return 0;
446
465
447
466
globalfail:
448
467
449
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
450
469
gnutls_global_deinit();
451
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
452
471
return -1;
453
472
}
454
473
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
474
static int init_gnutls_session(gnutls_session_t *session){
457
475
int ret;
458
476
/* GnuTLS session creation */
459
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
477
do {
478
ret = gnutls_init(session, GNUTLS_SERVER);
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
if(ret != GNUTLS_E_SUCCESS){
461
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
462
482
safer_gnutls_strerror(ret));
463
483
}
464
484
465
485
{
466
486
const char *err;
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
487
do {
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
469
491
fprintf(stderr, "Syntax error at: %s\n", err);
470
492
fprintf(stderr, "GnuTLS error: %s\n",
471
493
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
494
gnutls_deinit(*session);
473
495
return -1;
474
496
}
475
497
}
476
498
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
478
mc->cred);
479
if (ret != GNUTLS_E_SUCCESS) {
499
do {
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
501
mc.cred);
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
503
if(ret != GNUTLS_E_SUCCESS){
480
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
481
505
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
506
gnutls_deinit(*session);
483
507
return -1;
484
508
}
485
509
486
510
/* ignore client certificate if any. */
487
gnutls_certificate_server_set_request (*session,
488
GNUTLS_CERT_IGNORE);
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
489
512
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
491
514
492
515
return 0;
493
516
}
496
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
497
520
__attribute__((unused)) const char *txt){}
498
521
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
499
525
/* Called when a Mandos server is found */
500
526
static int start_mandos_communication(const char *ip, uint16_t port,
501
527
AvahiIfIndex if_index,
502
mandos_context *mc){
503
int ret, tcp_sd;
528
int af){
529
int ret, tcp_sd = -1;
504
530
ssize_t sret;
505
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
506
535
char *buffer = NULL;
507
536
char *decrypted_buffer;
508
537
size_t buffer_length = 0;
509
538
size_t buffer_capacity = 0;
510
ssize_t decrypted_buffer_size;
511
539
size_t written;
512
540
int retval = 0;
513
char interface[IF_NAMESIZE];
514
541
gnutls_session_t session;
515
516
ret = init_gnutls_session (mc, &session);
517
if (ret != 0){
542
int pf; /* Protocol family */
543
544
if(quit_now){
545
return -1;
546
}
547
548
switch(af){
549
case AF_INET6:
550
pf = PF_INET6;
551
break;
552
case AF_INET:
553
pf = PF_INET;
554
break;
555
default:
556
fprintf(stderr, "Bad address family: %d\n", af);
557
return -1;
558
}
559
560
ret = init_gnutls_session(&session);
561
if(ret != 0){
518
562
return -1;
519
563
}
520
564
521
565
if(debug){
522
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
523
567
"\n", ip, port);
524
568
}
525
569
526
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
527
if(tcp_sd < 0) {
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
571
if(tcp_sd < 0){
528
572
perror("socket");
529
return -1;
573
retval = -1;
574
goto mandos_end;
530
575
}
531
576
532
if(debug){
533
if(if_indextoname((unsigned int)if_index, interface) == NULL){
534
perror("if_indextoname");
535
return -1;
536
}
537
fprintf(stderr, "Binding to interface %s\n", interface);
577
if(quit_now){
578
goto mandos_end;
538
579
}
539
580
540
581
memset(&to, 0, sizeof(to));
541
to.in6.sin6_family = AF_INET6;
542
/* It would be nice to have a way to detect if we were passed an
543
IPv4 address here. Now we assume an IPv6 address. */
544
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
545
if (ret < 0 ){
582
if(af == AF_INET6){
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
585
} else { /* IPv4 */
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
588
}
589
if(ret < 0 ){
546
590
perror("inet_pton");
547
return -1;
591
retval = -1;
592
goto mandos_end;
548
593
}
549
594
if(ret == 0){
550
595
fprintf(stderr, "Bad address: %s\n", ip);
551
return -1;
552
}
553
to.in6.sin6_port = htons(port); /* Spurious warning */
596
retval = -1;
597
goto mandos_end;
598
}
599
if(af == AF_INET6){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
607
if(if_index == AVAHI_IF_UNSPEC){
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
611
goto mandos_end;
612
}
613
/* Set the network interface number as scope */
614
to.in6.sin6_scope_id = (uint32_t)if_index;
615
}
616
} else {
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
620
}
554
621
555
to.in6.sin6_scope_id = (uint32_t)if_index;
622
if(quit_now){
623
goto mandos_end;
624
}
556
625
557
626
if(debug){
558
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
559
port);
560
char addrstr[INET6_ADDRSTRLEN] = "";
561
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
562
sizeof(addrstr)) == NULL){
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
628
char interface[IF_NAMESIZE];
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
630
perror("if_indextoname");
631
} else {
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
634
}
635
} else {
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
638
}
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
641
const char *pcret;
642
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
645
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
648
}
649
if(pcret == NULL){
563
650
perror("inet_ntop");
564
651
} else {
565
652
if(strcmp(addrstr, ip) != 0){
568
655
}
569
656
}
570
657
571
ret = connect(tcp_sd, &to.in, sizeof(to));
572
if (ret < 0){
658
if(quit_now){
659
goto mandos_end;
660
}
661
662
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
664
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
666
}
667
if(ret < 0){
573
668
perror("connect");
574
return -1;
669
retval = -1;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
goto mandos_end;
575
675
}
576
676
577
677
const char *out = mandos_protocol_version;
578
678
written = 0;
579
while (true){
679
while(true){
580
680
size_t out_size = strlen(out);
581
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
582
682
out_size - written));
583
if (ret == -1){
683
if(ret == -1){
584
684
perror("write");
585
685
retval = -1;
586
686
goto mandos_end;
589
689
if(written < out_size){
590
690
continue;
591
691
} else {
592
if (out == mandos_protocol_version){
692
if(out == mandos_protocol_version){
593
693
written = 0;
594
694
out = "\r\n";
595
695
} else {
596
696
break;
597
697
}
598
698
}
699
700
if(quit_now){
701
goto mandos_end;
702
}
599
703
}
600
704
601
705
if(debug){
602
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
603
707
}
604
708
605
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
606
607
do{
608
ret = gnutls_handshake (session);
709
if(quit_now){
710
goto mandos_end;
711
}
712
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
714
715
if(quit_now){
716
goto mandos_end;
717
}
718
719
do {
720
ret = gnutls_handshake(session);
721
if(quit_now){
722
goto mandos_end;
723
}
609
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
610
725
611
if (ret != GNUTLS_E_SUCCESS){
726
if(ret != GNUTLS_E_SUCCESS){
612
727
if(debug){
613
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
614
gnutls_perror (ret);
729
gnutls_perror(ret);
615
730
}
616
731
retval = -1;
617
732
goto mandos_end;
620
735
/* Read OpenPGP packet that contains the wanted password */
621
736
622
737
if(debug){
623
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
624
739
ip);
625
740
}
626
741
627
742
while(true){
628
buffer_capacity = adjustbuffer(&buffer, buffer_length,
743
744
if(quit_now){
745
goto mandos_end;
746
}
747
748
buffer_capacity = incbuffer(&buffer, buffer_length,
629
749
buffer_capacity);
630
if (buffer_capacity == 0){
631
perror("adjustbuffer");
750
if(buffer_capacity == 0){
751
perror("incbuffer");
632
752
retval = -1;
633
753
goto mandos_end;
634
754
}
635
755
756
if(quit_now){
757
goto mandos_end;
758
}
759
636
760
sret = gnutls_record_recv(session, buffer+buffer_length,
637
761
BUFFER_SIZE);
638
if (sret == 0){
762
if(sret == 0){
639
763
break;
640
764
}
641
if (sret < 0){
765
if(sret < 0){
642
766
switch(sret){
643
767
case GNUTLS_E_INTERRUPTED:
644
768
case GNUTLS_E_AGAIN:
645
769
break;
646
770
case GNUTLS_E_REHANDSHAKE:
647
do{
648
ret = gnutls_handshake (session);
771
do {
772
ret = gnutls_handshake(session);
773
774
if(quit_now){
775
goto mandos_end;
776
}
649
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
650
if (ret < 0){
778
if(ret < 0){
651
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
652
gnutls_perror (ret);
780
gnutls_perror(ret);
653
781
retval = -1;
654
782
goto mandos_end;
655
783
}
658
786
fprintf(stderr, "Unknown error while reading data from"
659
787
" encrypted session with Mandos server\n");
660
788
retval = -1;
661
gnutls_bye (session, GNUTLS_SHUT_RDWR);
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
662
790
goto mandos_end;
663
791
}
664
792
} else {
670
798
fprintf(stderr, "Closing TLS session\n");
671
799
}
672
800
673
gnutls_bye (session, GNUTLS_SHUT_RDWR);
674
675
if (buffer_length > 0){
676
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
810
811
if(buffer_length > 0){
812
ssize_t decrypted_buffer_size;
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
677
814
buffer_length,
678
815
&decrypted_buffer);
679
if (decrypted_buffer_size >= 0){
816
if(decrypted_buffer_size >= 0){
817
680
818
written = 0;
681
819
while(written < (size_t) decrypted_buffer_size){
682
ret = (int)fwrite (decrypted_buffer + written, 1,
683
(size_t)decrypted_buffer_size - written,
684
stdout);
820
if(quit_now){
821
goto mandos_end;
822
}
823
824
ret = (int)fwrite(decrypted_buffer + written, 1,
825
(size_t)decrypted_buffer_size - written,
826
stdout);
685
827
if(ret == 0 and ferror(stdout)){
686
828
if(debug){
687
829
fprintf(stderr, "Error writing encrypted data: %s\n",
704
846
705
847
mandos_end:
706
848
free(buffer);
707
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
708
852
if(ret == -1){
709
853
perror("close");
710
854
}
711
gnutls_deinit (session);
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
712
859
return retval;
713
860
}
714
861
715
862
static void resolve_callback(AvahiSServiceResolver *r,
716
863
AvahiIfIndex interface,
717
AVAHI_GCC_UNUSED AvahiProtocol protocol,
864
AvahiProtocol proto,
718
865
AvahiResolverEvent event,
719
866
const char *name,
720
867
const char *type,
725
872
AVAHI_GCC_UNUSED AvahiStringList *txt,
726
873
AVAHI_GCC_UNUSED AvahiLookupResultFlags
727
874
flags,
728
void* userdata) {
729
mandos_context *mc = userdata;
875
AVAHI_GCC_UNUSED void* userdata){
730
876
assert(r);
731
877
732
878
/* Called whenever a service has been resolved successfully or
733
879
timed out */
734
880
735
switch (event) {
881
if(quit_now){
882
return;
883
}
884
885
switch(event){
736
886
default:
737
887
case AVAHI_RESOLVER_FAILURE:
738
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
739
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
740
avahi_strerror(avahi_server_errno(mc->server)));
890
avahi_strerror(avahi_server_errno(mc.server)));
741
891
break;
742
892
743
893
case AVAHI_RESOLVER_FOUND:
746
896
avahi_address_snprint(ip, sizeof(ip), address);
747
897
if(debug){
748
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
749
PRIu16 ") on port %d\n", name, host_name, ip,
750
interface, port);
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
751
901
}
752
int ret = start_mandos_communication(ip, port, interface, mc);
753
if (ret == 0){
754
avahi_simple_poll_quit(mc->simple_poll);
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
904
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
755
906
}
756
907
}
757
908
}
758
909
avahi_s_service_resolver_free(r);
759
910
}
760
911
761
static void browse_callback( AvahiSServiceBrowser *b,
762
AvahiIfIndex interface,
763
AvahiProtocol protocol,
764
AvahiBrowserEvent event,
765
const char *name,
766
const char *type,
767
const char *domain,
768
AVAHI_GCC_UNUSED AvahiLookupResultFlags
769
flags,
770
void* userdata) {
771
mandos_context *mc = userdata;
912
static void browse_callback(AvahiSServiceBrowser *b,
913
AvahiIfIndex interface,
914
AvahiProtocol protocol,
915
AvahiBrowserEvent event,
916
const char *name,
917
const char *type,
918
const char *domain,
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
flags,
921
AVAHI_GCC_UNUSED void* userdata){
772
922
assert(b);
773
923
774
924
/* Called whenever a new services becomes available on the LAN or
775
925
is removed from the LAN */
776
926
777
switch (event) {
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
778
932
default:
779
933
case AVAHI_BROWSER_FAILURE:
780
934
781
935
fprintf(stderr, "(Avahi browser) %s\n",
782
avahi_strerror(avahi_server_errno(mc->server)));
783
avahi_simple_poll_quit(mc->simple_poll);
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
784
938
return;
785
939
786
940
case AVAHI_BROWSER_NEW:
789
943
the callback function is called the Avahi server will free the
790
944
resolver for us. */
791
945
792
if (!(avahi_s_service_resolver_new(mc->server, interface,
793
protocol, name, type, domain,
794
AVAHI_PROTO_INET6, 0,
795
resolve_callback, mc)))
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
796
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
797
name, avahi_strerror(avahi_server_errno(mc->server)));
950
name, avahi_strerror(avahi_server_errno(mc.server)));
798
951
break;
799
952
800
953
case AVAHI_BROWSER_REMOVE:
809
962
}
810
963
}
811
964
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
967
if(quit_now){
968
return;
969
}
970
quit_now = 1;
971
signal_received = sig;
972
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
977
}
978
812
979
int main(int argc, char *argv[]){
813
AvahiSServiceBrowser *sb = NULL;
814
int error;
815
int ret;
816
int exitcode = EXIT_SUCCESS;
817
const char *interface = "eth0";
818
struct ifreq network;
819
int sd;
820
uid_t uid;
821
gid_t gid;
822
char *connect_to = NULL;
823
char tempdir[] = "/tmp/mandosXXXXXX";
824
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
825
const char *seckey = PATHDIR "/" SECKEY;
826
const char *pubkey = PATHDIR "/" PUBKEY;
827
828
mandos_context mc = { .simple_poll = NULL, .server = NULL,
829
.dh_bits = 1024, .priority = "SECURE256"
830
":!CTYPE-X.509:+CTYPE-OPENPGP" };
831
bool gnutls_initalized = false;
832
bool gpgme_initalized = false;
833
834
{
835
struct argp_option options[] = {
836
{ .name = "debug", .key = 128,
837
.doc = "Debug mode", .group = 3 },
838
{ .name = "connect", .key = 'c',
839
.arg = "ADDRESS:PORT",
840
.doc = "Connect directly to a specific Mandos server",
841
.group = 1 },
842
{ .name = "interface", .key = 'i',
843
.arg = "NAME",
844
.doc = "Interface that will be used to search for Mandos"
845
" servers",
846
.group = 1 },
847
{ .name = "seckey", .key = 's',
848
.arg = "FILE",
849
.doc = "OpenPGP secret key file base name",
850
.group = 1 },
851
{ .name = "pubkey", .key = 'p',
852
.arg = "FILE",
853
.doc = "OpenPGP public key file base name",
854
.group = 2 },
855
{ .name = "dh-bits", .key = 129,
856
.arg = "BITS",
857
.doc = "Bit length of the prime number used in the"
858
" Diffie-Hellman key exchange",
859
.group = 2 },
860
{ .name = "priority", .key = 130,
861
.arg = "STRING",
862
.doc = "GnuTLS priority string for the TLS handshake",
863
.group = 1 },
864
{ .name = NULL }
865
};
866
867
error_t parse_opt (int key, char *arg,
868
struct argp_state *state) {
869
/* Get the INPUT argument from `argp_parse', which we know is
870
a pointer to our plugin list pointer. */
871
switch (key) {
872
case 128: /* --debug */
873
debug = true;
874
break;
875
case 'c': /* --connect */
876
connect_to = arg;
877
break;
878
case 'i': /* --interface */
879
interface = arg;
880
break;
881
case 's': /* --seckey */
882
seckey = arg;
883
break;
884
case 'p': /* --pubkey */
885
pubkey = arg;
886
break;
887
case 129: /* --dh-bits */
888
errno = 0;
889
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
890
if (errno){
891
perror("strtol");
892
exit(EXIT_FAILURE);
893
}
894
break;
895
case 130: /* --priority */
896
mc.priority = arg;
897
break;
898
case ARGP_KEY_ARG:
899
argp_usage (state);
900
case ARGP_KEY_END:
901
break;
902
default:
903
return ARGP_ERR_UNKNOWN;
904
}
905
return 0;
906
}
907
908
struct argp argp = { .options = options, .parser = parse_opt,
909
.args_doc = "",
910
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
913
if (ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
920
/* If the interface is down, bring it up */
921
{
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
923
if(sd < 0) {
924
perror("socket");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
930
if(ret == -1){
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
933
goto end;
934
}
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
if(ret == -1){
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
941
goto end;
942
}
943
}
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
948
}
949
950
uid = getuid();
951
gid = getgid();
952
953
ret = setuid(uid);
954
if (ret == -1){
955
perror("setuid");
956
}
957
958
setgid(gid);
959
if (ret == -1){
960
perror("setgid");
961
}
962
963
ret = init_gnutls_global(&mc, pubkey, seckey);
964
if (ret == -1){
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
967
goto end;
968
} else {
969
gnutls_initalized = true;
970
}
971
972
if(mkdtemp(tempdir) == NULL){
973
perror("mkdtemp");
974
tempdir[0] = '\0';
975
goto end;
976
}
977
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
} else {
983
gpgme_initalized = true;
984
}
985
980
AvahiSServiceBrowser *sb = NULL;
981
int error;
982
int ret;
983
intmax_t tmpmax;
984
char *tmp;
985
int exitcode = EXIT_SUCCESS;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
993
char tempdir[] = "/tmp/mandosXXXXXX";
994
bool tempdir_created = false;
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
996
const char *seckey = PATHDIR "/" SECKEY;
997
const char *pubkey = PATHDIR "/" PUBKEY;
998
999
bool gnutls_initialized = false;
1000
bool gpgme_initialized = false;
1001
float delay = 2.5f;
1002
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1005
1006
uid = getuid();
1007
gid = getgid();
1008
1009
/* Lower any group privileges we might have, just to be safe */
1010
errno = 0;
1011
ret = setgid(gid);
1012
if(ret == -1){
1013
perror("setgid");
1014
}
1015
1016
/* Lower user privileges (temporarily) */
1017
errno = 0;
1018
ret = seteuid(uid);
1019
if(ret == -1){
1020
perror("seteuid");
1021
}
1022
1023
if(quit_now){
1024
goto end;
1025
}
1026
1027
{
1028
struct argp_option options[] = {
1029
{ .name = "debug", .key = 128,
1030
.doc = "Debug mode", .group = 3 },
1031
{ .name = "connect", .key = 'c',
1032
.arg = "ADDRESS:PORT",
1033
.doc = "Connect directly to a specific Mandos server",
1034
.group = 1 },
1035
{ .name = "interface", .key = 'i',
1036
.arg = "NAME",
1037
.doc = "Network interface that will be used to search for"
1038
" Mandos servers",
1039
.group = 1 },
1040
{ .name = "seckey", .key = 's',
1041
.arg = "FILE",
1042
.doc = "OpenPGP secret key file base name",
1043
.group = 1 },
1044
{ .name = "pubkey", .key = 'p',
1045
.arg = "FILE",
1046
.doc = "OpenPGP public key file base name",
1047
.group = 2 },
1048
{ .name = "dh-bits", .key = 129,
1049
.arg = "BITS",
1050
.doc = "Bit length of the prime number used in the"
1051
" Diffie-Hellman key exchange",
1052
.group = 2 },
1053
{ .name = "priority", .key = 130,
1054
.arg = "STRING",
1055
.doc = "GnuTLS priority string for the TLS handshake",
1056
.group = 1 },
1057
{ .name = "delay", .key = 131,
1058
.arg = "SECONDS",
1059
.doc = "Maximum delay to wait for interface startup",
1060
.group = 2 },
1061
{ .name = NULL }
1062
};
1063
1064
error_t parse_opt(int key, char *arg,
1065
struct argp_state *state){
1066
switch(key){
1067
case 128: /* --debug */
1068
debug = true;
1069
break;
1070
case 'c': /* --connect */
1071
connect_to = arg;
1072
break;
1073
case 'i': /* --interface */
1074
interface = arg;
1075
break;
1076
case 's': /* --seckey */
1077
seckey = arg;
1078
break;
1079
case 'p': /* --pubkey */
1080
pubkey = arg;
1081
break;
1082
case 129: /* --dh-bits */
1083
errno = 0;
1084
tmpmax = strtoimax(arg, &tmp, 10);
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1089
}
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1091
break;
1092
case 130: /* --priority */
1093
mc.priority = arg;
1094
break;
1095
case 131: /* --delay */
1096
errno = 0;
1097
delay = strtof(arg, &tmp);
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
1106
break;
1107
default:
1108
return ARGP_ERR_UNKNOWN;
1109
}
1110
return 0;
1111
}
1112
1113
struct argp argp = { .options = options, .parser = parse_opt,
1114
.args_doc = "",
1115
.doc = "Mandos client -- Get and decrypt"
1116
" passwords from a Mandos server" };
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
1123
}
1124
1125
if(not debug){
1126
avahi_set_log_function(empty_log);
1127
}
1128
1129
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1130
from the signal handler */
1131
/* Initialize the pseudo-RNG for Avahi */
1132
srand((unsigned int) time(NULL));
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
1137
goto end;
1138
}
1139
1140
sigemptyset(&sigterm_action.sa_mask);
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1142
if(ret == -1){
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1148
if(ret == -1){
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
1151
goto end;
1152
}
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1154
if(ret == -1){
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
1157
goto end;
1158
}
1159
/* Need to check if the handler is SIG_IGN before handling:
1160
| [[info:libc:Initial Signal Actions]] |
1161
| [[info:libc:Basic Signal Handling]] |
1162
*/
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1164
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1167
}
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1177
if(ret == -1){
1178
perror("sigaction");
1179
return EXIT_FAILURE;
1180
}
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1183
if(ret == -1){
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1188
}
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1190
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1193
}
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
986
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
987
1206
if(if_index == 0){
988
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
989
exit(EXIT_FAILURE);
990
}
991
992
if(connect_to != NULL){
993
/* Connect directly, do not use Zeroconf */
994
/* (Mainly meant for debugging) */
995
char *address = strrchr(connect_to, ':');
996
if(address == NULL){
997
fprintf(stderr, "No colon in address\n");
998
exitcode = EXIT_FAILURE;
999
goto end;
1000
}
1001
errno = 0;
1002
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1003
if(errno){
1004
perror("Bad port number");
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
*address = '\0';
1009
address = connect_to;
1010
ret = start_mandos_communication(address, port, if_index, &mc);
1011
if(ret < 0){
1012
exitcode = EXIT_FAILURE;
1013
} else {
1014
exitcode = EXIT_SUCCESS;
1015
}
1016
goto end;
1017
}
1018
1019
if (not debug){
1020
avahi_set_log_function(empty_log);
1021
}
1022
1023
/* Initialize the pseudo-RNG for Avahi */
1024
srand((unsigned int) time(NULL));
1025
1026
/* Allocate main Avahi loop object */
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if (mc.simple_poll == NULL) {
1029
fprintf(stderr, "Avahi: Failed to create simple poll"
1030
" object.\n");
1031
exitcode = EXIT_FAILURE;
1032
goto end;
1033
}
1034
1035
{
1036
AvahiServerConfig config;
1037
/* Do not publish any local Zeroconf records */
1038
avahi_server_config_init(&config);
1039
config.publish_hinfo = 0;
1040
config.publish_addresses = 0;
1041
config.publish_workstation = 0;
1042
config.publish_domain = 0;
1043
1044
/* Allocate a new server */
1045
mc.server = avahi_server_new(avahi_simple_poll_get
1046
(mc.simple_poll), &config, NULL,
1047
NULL, &error);
1048
1049
/* Free the Avahi configuration data */
1050
avahi_server_config_free(&config);
1051
}
1052
1053
/* Check if creating the Avahi server object succeeded */
1054
if (mc.server == NULL) {
1055
fprintf(stderr, "Failed to create Avahi server: %s\n",
1056
avahi_strerror(error));
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
1060
1061
/* Create the Avahi service browser */
1062
sb = avahi_s_service_browser_new(mc.server, if_index,
1063
AVAHI_PROTO_INET6,
1064
"_mandos._tcp", NULL, 0,
1065
browse_callback, &mc);
1066
if (sb == NULL) {
1067
fprintf(stderr, "Failed to create service browser: %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
exitcode = EXIT_FAILURE;
1070
goto end;
1071
}
1072
1073
/* Run the main loop */
1074
1075
if (debug){
1076
fprintf(stderr, "Starting Avahi loop search\n");
1077
}
1078
1079
avahi_simple_poll_loop(mc.simple_poll);
1080
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
1288
}
1289
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
break;
1307
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
1338
} else {
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
1345
}
1346
1347
if(quit_now){
1348
goto end;
1349
}
1350
1351
ret = init_gnutls_global(pubkey, seckey);
1352
if(ret == -1){
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
1355
goto end;
1356
} else {
1357
gnutls_initialized = true;
1358
}
1359
1360
if(quit_now){
1361
goto end;
1362
}
1363
1364
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
1368
goto end;
1369
}
1370
1371
if(quit_now){
1372
goto end;
1373
}
1374
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
1378
goto end;
1379
} else {
1380
gpgme_initialized = true;
1381
}
1382
1383
if(quit_now){
1384
goto end;
1385
}
1386
1387
if(connect_to != NULL){
1388
/* Connect directly, do not use Zeroconf */
1389
/* (Mainly meant for debugging) */
1390
char *address = strrchr(connect_to, ':');
1391
if(address == NULL){
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
1394
goto end;
1395
}
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
uint16_t port;
1402
errno = 0;
1403
tmpmax = strtoimax(address+1, &tmp, 10);
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
1408
goto end;
1409
}
1410
1411
if(quit_now){
1412
goto end;
1413
}
1414
1415
port = (uint16_t)tmpmax;
1416
*address = '\0';
1417
address = connect_to;
1418
/* Colon in address indicates IPv6 */
1419
int af;
1420
if(strchr(address, ':') != NULL){
1421
af = AF_INET6;
1422
} else {
1423
af = AF_INET;
1424
}
1425
1426
if(quit_now){
1427
goto end;
1428
}
1429
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
1434
exitcode = EXIT_SUCCESS;
1435
}
1436
goto end;
1437
}
1438
1439
if(quit_now){
1440
goto end;
1441
}
1442
1443
{
1444
AvahiServerConfig config;
1445
/* Do not publish any local Zeroconf records */
1446
avahi_server_config_init(&config);
1447
config.publish_hinfo = 0;
1448
config.publish_addresses = 0;
1449
config.publish_workstation = 0;
1450
config.publish_domain = 0;
1451
1452
/* Allocate a new server */
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
1456
1457
/* Free the Avahi configuration data */
1458
avahi_server_config_free(&config);
1459
}
1460
1461
/* Check if creating the Avahi server object succeeded */
1462
if(mc.server == NULL){
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
1469
if(quit_now){
1470
goto end;
1471
}
1472
1473
/* Create the Avahi service browser */
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1476
NULL, 0, browse_callback, NULL);
1477
if(sb == NULL){
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
1481
goto end;
1482
}
1483
1484
if(quit_now){
1485
goto end;
1486
}
1487
1488
/* Run the main loop */
1489
1490
if(debug){
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
1495
1081
1496
end:
1082
1083
if (debug){
1084
fprintf(stderr, "%s exiting\n", argv[0]);
1085
}
1086
1087
/* Cleanup things */
1088
if (sb != NULL)
1089
avahi_s_service_browser_free(sb);
1090
1091
if (mc.server != NULL)
1092
avahi_server_free(mc.server);
1093
1094
if (mc.simple_poll != NULL)
1095
avahi_simple_poll_free(mc.simple_poll);
1096
1097
if (gnutls_initalized){
1098
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit ();
1100
gnutls_dh_params_deinit(mc.dh_params);
1101
}
1102
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1497
1498
if(debug){
1499
fprintf(stderr, "%s exiting\n", argv[0]);
1500
}
1501
1502
/* Cleanup things */
1503
if(sb != NULL)
1504
avahi_s_service_browser_free(sb);
1505
1506
if(mc.server != NULL)
1507
avahi_server_free(mc.server);
1508
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
1511
1512
if(gnutls_initialized){
1513
gnutls_certificate_free_credentials(mc.cred);
1514
gnutls_global_deinit();
1515
gnutls_dh_params_deinit(mc.dh_params);
1516
}
1517
1518
if(gpgme_initialized){
1519
gpgme_release(mc.ctx);
1520
}
1521
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
1551
}
1552
}
1553
1554
/* Removes the temp directory used by GPGME */
1555
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1113
1561
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
closedir(d);
1137
}
1138
ret = rmdir(tempdir);
1139
if(ret == -1){
1140
perror("rmdir");
1141
}
1142
}
1143
1144
return exitcode;
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
1576
char *fullname = NULL;
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
direntry->d_name);
1579
if(ret < 0){
1580
perror("asprintf");
1581
continue;
1582
}
1583
ret = remove(fullname);
1584
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
1587
}
1588
free(fullname);
1589
}
1590
closedir(d);
1591
}
1592
ret = rmdir(tempdir);
1593
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
1595
}
1596
}
1597
1598
if(quit_now){
1599
sigemptyset(&old_sigterm_action.sa_mask);
1600
old_sigterm_action.sa_handler = SIG_DFL;
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1602
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
1606
}
1607
1608
return exitcode;
1145
1609
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0