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237.2.55
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-02-03 22:41:49 UTC
- mto: (24.1.131 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090203224149-fc1301jojmusbzlx
* Makefile (run-server): Use "--no-dbus" unconditionally.
* initramfs-tools-script: Correct tests for writable "/conf/conf.d".
* mandos: Add process ID number to logging messages.
(IPv6_TCPServer.server_bind): Use plain "raise".
(main): Do not try to handle SIGSEGV; it does not work. Use plain
"raise". Log KeyboardInterrupt and server exit.
* initramfs-tools-script: Correct tests for writable "/conf/conf.d".
* mandos: Add process ID number to logging messages.
(IPv6_TCPServer.server_bind): Use plain "raise".
(main): Do not try to handle SIGSEGV; it does not work. Use plain
"raise". Log KeyboardInterrupt and server exit.
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
56
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
56
struct in6_addr, inet_pton(),
57
connect() */
59
58
#include <fcntl.h> /* open() */
60
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
60
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
62
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
#include <netinet/in.h>
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
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
89
#ifdef __linux__
90
78
#include <sys/klog.h> /* klogctl() */
91
#endif /* __linux__ */
92
79
93
80
/* Avahi */
94
81
/* All Avahi types, constants and functions
128
115
static const char mandos_protocol_version[] = "1";
129
116
const char *argp_program_version = "mandos-client " VERSION;
130
117
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
131
static const char sys_class_net[] = "/sys/class/net";
132
char *connect_to = NULL;
133
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
144
118
145
119
/* Used for passing in values through the Avahi callback functions */
146
120
typedef struct {
151
125
gnutls_dh_params_t dh_params;
152
126
const char *priority;
153
127
gpgme_ctx_t ctx;
154
server *current_server;
155
128
} mandos_context;
156
129
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
162
163
sig_atomic_t quit_now = 0;
164
int signal_received = 0;
165
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
172
173
130
/*
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
* bytes. "buffer_capacity" is how much is currently allocated,
131
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
132
* "buffer_capacity" is how much is currently allocated,
176
133
* "buffer_length" is how much is already used.
177
134
*/
178
size_t incbuffer(char **buffer, size_t buffer_length,
135
size_t adjustbuffer(char **buffer, size_t buffer_length,
179
136
size_t buffer_capacity){
180
137
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
138
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
187
144
return buffer_capacity;
188
145
}
189
146
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
193
int ret;
194
server *new_server = malloc(sizeof(server));
195
if(new_server == NULL){
196
perror_plus("malloc");
197
return -1;
198
}
199
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
203
if(new_server->ip == NULL){
204
perror_plus("strdup");
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
209
new_server->next = new_server;
210
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
213
} else {
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
216
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
return 0;
225
}
226
227
147
/*
228
148
* Initialize GPGME.
229
149
*/
230
static bool init_gpgme(const char *seckey,
150
static bool init_gpgme(mandos_context *mc, const char *seckey,
231
151
const char *pubkey, const char *tempdir){
152
int ret;
232
153
gpgme_error_t rc;
233
154
gpgme_engine_info_t engine_info;
234
155
237
158
* Helper function to insert pub and seckey to the engine keyring.
238
159
*/
239
160
bool import_key(const char *filename){
240
int ret;
241
161
int fd;
242
162
gpgme_data_t pgp_data;
243
163
244
164
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
245
165
if(fd == -1){
246
perror_plus("open");
166
perror("open");
247
167
return false;
248
168
}
249
169
254
174
return false;
255
175
}
256
176
257
rc = gpgme_op_import(mc.ctx, pgp_data);
177
rc = gpgme_op_import(mc->ctx, pgp_data);
258
178
if(rc != GPG_ERR_NO_ERROR){
259
179
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
180
gpgme_strsource(rc), gpgme_strerror(rc));
263
183
264
184
ret = (int)TEMP_FAILURE_RETRY(close(fd));
265
185
if(ret == -1){
266
perror_plus("close");
186
perror("close");
267
187
}
268
188
gpgme_data_release(pgp_data);
269
189
return true;
270
190
}
271
191
272
192
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
193
fprintf(stderr, "Initialize gpgme\n");
274
194
}
275
195
276
196
/* Init GPGME */
303
223
}
304
224
305
225
/* Create new GPGME "context" */
306
rc = gpgme_new(&(mc.ctx));
226
rc = gpgme_new(&(mc->ctx));
307
227
if(rc != GPG_ERR_NO_ERROR){
308
228
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
229
gpgme_strsource(rc), gpgme_strerror(rc));
314
234
return false;
315
235
}
316
236
317
return true;
237
return true;
318
238
}
319
239
320
240
/*
321
241
* Decrypt OpenPGP data.
322
242
* Returns -1 on error
323
243
*/
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
244
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
245
const char *cryptotext,
325
246
size_t crypto_size,
326
247
char **plaintext){
327
248
gpgme_data_t dh_crypto, dh_plain;
354
275
355
276
/* Decrypt data from the cryptotext data buffer to the plaintext
356
277
data buffer */
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
278
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
279
if(rc != GPG_ERR_NO_ERROR){
359
280
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
281
gpgme_strsource(rc), gpgme_strerror(rc));
361
282
plaintext_length = -1;
362
283
if(debug){
363
284
gpgme_decrypt_result_t result;
364
result = gpgme_op_decrypt_result(mc.ctx);
285
result = gpgme_op_decrypt_result(mc->ctx);
365
286
if(result == NULL){
366
287
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
367
288
} else {
374
295
}
375
296
gpgme_recipient_t recipient;
376
297
recipient = result->recipients;
377
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
384
recipient = recipient->next;
298
if(recipient){
299
while(recipient != NULL){
300
fprintf(stderr, "Public key algorithm: %s\n",
301
gpgme_pubkey_algo_name(recipient->pubkey_algo));
302
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
303
fprintf(stderr, "Secret key available: %s\n",
304
recipient->status == GPG_ERR_NO_SECKEY
305
? "No" : "Yes");
306
recipient = recipient->next;
307
}
385
308
}
386
309
}
387
310
}
394
317
395
318
/* Seek back to the beginning of the GPGME plaintext data buffer */
396
319
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
397
perror_plus("gpgme_data_seek");
320
perror("gpgme_data_seek");
398
321
plaintext_length = -1;
399
322
goto decrypt_end;
400
323
}
401
324
402
325
*plaintext = NULL;
403
326
while(true){
404
plaintext_capacity = incbuffer(plaintext,
327
plaintext_capacity = adjustbuffer(plaintext,
405
328
(size_t)plaintext_length,
406
329
plaintext_capacity);
407
330
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
331
perror("adjustbuffer");
409
332
plaintext_length = -1;
410
333
goto decrypt_end;
411
334
}
418
341
break;
419
342
}
420
343
if(ret < 0){
421
perror_plus("gpgme_data_read");
344
perror("gpgme_data_read");
422
345
plaintext_length = -1;
423
346
goto decrypt_end;
424
347
}
443
366
return plaintext_length;
444
367
}
445
368
446
static const char * safer_gnutls_strerror(int value){
369
static const char * safer_gnutls_strerror(int value) {
447
370
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
371
-Wunreachable-code */
449
372
if(ret == NULL)
457
380
fprintf(stderr, "GnuTLS: %s", string);
458
381
}
459
382
460
static int init_gnutls_global(const char *pubkeyfilename,
383
static int init_gnutls_global(mandos_context *mc,
384
const char *pubkeyfilename,
461
385
const char *seckeyfilename){
462
386
int ret;
463
387
466
390
}
467
391
468
392
ret = gnutls_global_init();
469
if(ret != GNUTLS_E_SUCCESS){
393
if(ret != GNUTLS_E_SUCCESS) {
470
394
fprintf(stderr, "GnuTLS global_init: %s\n",
471
395
safer_gnutls_strerror(ret));
472
396
return -1;
481
405
}
482
406
483
407
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
408
gnutls_certificate_allocate_credentials(&mc->cred);
485
409
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
410
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
411
* from
412
* -Wunreachable-code
413
*/
487
414
safer_gnutls_strerror(ret));
488
415
gnutls_global_deinit();
489
416
return -1;
496
423
}
497
424
498
425
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
426
(mc->cred, pubkeyfilename, seckeyfilename,
500
427
GNUTLS_OPENPGP_FMT_BASE64);
501
if(ret != GNUTLS_E_SUCCESS){
428
if(ret != GNUTLS_E_SUCCESS) {
502
429
fprintf(stderr,
503
430
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
431
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
508
435
}
509
436
510
437
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
438
ret = gnutls_dh_params_init(&mc->dh_params);
439
if(ret != GNUTLS_E_SUCCESS) {
513
440
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
441
" %s\n", safer_gnutls_strerror(ret));
515
442
goto globalfail;
516
443
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
444
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
445
if(ret != GNUTLS_E_SUCCESS) {
519
446
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
447
safer_gnutls_strerror(ret));
521
448
goto globalfail;
522
449
}
523
450
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
451
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
452
526
453
return 0;
527
454
528
455
globalfail:
529
456
530
gnutls_certificate_free_credentials(mc.cred);
457
gnutls_certificate_free_credentials(mc->cred);
531
458
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
459
gnutls_dh_params_deinit(mc->dh_params);
533
460
return -1;
534
461
}
535
462
536
static int init_gnutls_session(gnutls_session_t *session){
463
static int init_gnutls_session(mandos_context *mc,
464
gnutls_session_t *session){
537
465
int ret;
538
466
/* GnuTLS session creation */
539
do {
540
ret = gnutls_init(session, GNUTLS_SERVER);
541
if(quit_now){
542
return -1;
543
}
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
467
ret = gnutls_init(session, GNUTLS_SERVER);
545
468
if(ret != GNUTLS_E_SUCCESS){
546
469
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
470
safer_gnutls_strerror(ret));
549
472
550
473
{
551
474
const char *err;
552
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
554
if(quit_now){
555
gnutls_deinit(*session);
556
return -1;
557
}
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
if(ret != GNUTLS_E_SUCCESS){
475
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
476
if(ret != GNUTLS_E_SUCCESS) {
560
477
fprintf(stderr, "Syntax error at: %s\n", err);
561
478
fprintf(stderr, "GnuTLS error: %s\n",
562
479
safer_gnutls_strerror(ret));
565
482
}
566
483
}
567
484
568
do {
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
571
if(quit_now){
572
gnutls_deinit(*session);
573
return -1;
574
}
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
if(ret != GNUTLS_E_SUCCESS){
485
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
486
mc->cred);
487
if(ret != GNUTLS_E_SUCCESS) {
577
488
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
489
safer_gnutls_strerror(ret));
579
490
gnutls_deinit(*session);
581
492
}
582
493
583
494
/* ignore client certificate if any. */
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
495
gnutls_certificate_server_set_request(*session,
496
GNUTLS_CERT_IGNORE);
585
497
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
498
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
499
588
500
return 0;
589
501
}
595
507
/* Called when a Mandos server is found */
596
508
static int start_mandos_communication(const char *ip, uint16_t port,
597
509
AvahiIfIndex if_index,
598
int af){
599
int ret, tcp_sd = -1;
510
mandos_context *mc){
511
int ret, tcp_sd;
600
512
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
513
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
605
514
char *buffer = NULL;
606
char *decrypted_buffer = NULL;
515
char *decrypted_buffer;
607
516
size_t buffer_length = 0;
608
517
size_t buffer_capacity = 0;
518
ssize_t decrypted_buffer_size;
609
519
size_t written;
610
int retval = -1;
520
int retval = 0;
521
char interface[IF_NAMESIZE];
611
522
gnutls_session_t session;
612
int pf; /* Protocol family */
613
614
errno = 0;
615
616
if(quit_now){
617
errno = EINTR;
618
return -1;
619
}
620
621
switch(af){
622
case AF_INET6:
623
pf = PF_INET6;
624
break;
625
case AF_INET:
626
pf = PF_INET;
627
break;
628
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
630
errno = EINVAL;
631
return -1;
632
}
633
634
ret = init_gnutls_session(&session);
523
524
ret = init_gnutls_session(mc, &session);
635
525
if(ret != 0){
636
526
return -1;
637
527
}
638
528
639
529
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
530
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
641
531
"\n", ip, port);
642
532
}
643
533
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
645
if(tcp_sd < 0){
646
int e = errno;
647
perror_plus("socket");
648
errno = e;
649
goto mandos_end;
534
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
535
if(tcp_sd < 0) {
536
perror("socket");
537
return -1;
650
538
}
651
539
652
if(quit_now){
653
errno = EINTR;
654
goto mandos_end;
540
if(debug){
541
if(if_indextoname((unsigned int)if_index, interface) == NULL){
542
perror("if_indextoname");
543
return -1;
544
}
545
fprintf(stderr, "Binding to interface %s\n", interface);
655
546
}
656
547
657
548
memset(&to, 0, sizeof(to));
658
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
661
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
664
}
549
to.in6.sin6_family = AF_INET6;
550
/* It would be nice to have a way to detect if we were passed an
551
IPv4 address here. Now we assume an IPv6 address. */
552
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
665
553
if(ret < 0 ){
666
int e = errno;
667
perror_plus("inet_pton");
668
errno = e;
669
goto mandos_end;
554
perror("inet_pton");
555
return -1;
670
556
}
671
557
if(ret == 0){
672
int e = errno;
673
558
fprintf(stderr, "Bad address: %s\n", ip);
674
errno = e;
675
goto mandos_end;
559
return -1;
676
560
}
677
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
685
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
688
errno = EINVAL;
689
goto mandos_end;
690
}
691
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
693
}
694
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
561
to.in6.sin6_port = htons(port); /* Spurious warnings from
696
562
-Wconversion and
697
563
-Wunreachable-code */
698
}
699
564
700
if(quit_now){
701
errno = EINTR;
702
goto mandos_end;
703
}
565
to.in6.sin6_scope_id = (uint32_t)if_index;
704
566
705
567
if(debug){
706
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
707
char interface[IF_NAMESIZE];
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
perror_plus("if_indextoname");
710
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
713
}
714
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
717
}
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
724
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
727
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
568
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
569
port);
570
char addrstr[INET6_ADDRSTRLEN] = "";
571
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
572
sizeof(addrstr)) == NULL){
573
perror("inet_ntop");
730
574
} else {
731
575
if(strcmp(addrstr, ip) != 0){
732
576
fprintf(stderr, "Canonical address form: %s\n", addrstr);
734
578
}
735
579
}
736
580
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
744
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
}
581
ret = connect(tcp_sd, &to.in, sizeof(to));
747
582
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
583
perror("connect");
584
return -1;
759
585
}
760
586
761
587
const char *out = mandos_protocol_version;
765
591
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
592
out_size - written));
767
593
if(ret == -1){
768
int e = errno;
769
perror_plus("write");
770
errno = e;
594
perror("write");
595
retval = -1;
771
596
goto mandos_end;
772
597
}
773
598
written += (size_t)ret;
781
606
break;
782
607
}
783
608
}
784
785
if(quit_now){
786
errno = EINTR;
787
goto mandos_end;
788
}
789
609
}
790
610
791
611
if(debug){
792
612
fprintf(stderr, "Establishing TLS session with %s\n", ip);
793
613
}
794
614
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
798
}
799
800
/* Spurious warning from -Wint-to-pointer-cast */
801
615
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
802
616
803
if(quit_now){
804
errno = EINTR;
805
goto mandos_end;
806
}
807
808
do {
617
do{
809
618
ret = gnutls_handshake(session);
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
814
619
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
815
620
816
621
if(ret != GNUTLS_E_SUCCESS){
818
623
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
819
624
gnutls_perror(ret);
820
625
}
821
errno = EPROTO;
626
retval = -1;
822
627
goto mandos_end;
823
628
}
824
629
825
630
/* Read OpenPGP packet that contains the wanted password */
826
631
827
632
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
633
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
829
634
ip);
830
635
}
831
636
832
637
while(true){
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
buffer_capacity = incbuffer(&buffer, buffer_length,
638
buffer_capacity = adjustbuffer(&buffer, buffer_length,
840
639
buffer_capacity);
841
640
if(buffer_capacity == 0){
842
int e = errno;
843
perror_plus("incbuffer");
844
errno = e;
845
goto mandos_end;
846
}
847
848
if(quit_now){
849
errno = EINTR;
641
perror("adjustbuffer");
642
retval = -1;
850
643
goto mandos_end;
851
644
}
852
645
861
654
case GNUTLS_E_AGAIN:
862
655
break;
863
656
case GNUTLS_E_REHANDSHAKE:
864
do {
657
do{
865
658
ret = gnutls_handshake(session);
866
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
871
659
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
660
if(ret < 0){
873
661
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
874
662
gnutls_perror(ret);
875
errno = EPROTO;
663
retval = -1;
876
664
goto mandos_end;
877
665
}
878
666
break;
879
667
default:
880
668
fprintf(stderr, "Unknown error while reading data from"
881
669
" encrypted session with Mandos server\n");
670
retval = -1;
882
671
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
884
672
goto mandos_end;
885
673
}
886
674
} else {
892
680
fprintf(stderr, "Closing TLS session\n");
893
681
}
894
682
895
if(quit_now){
896
errno = EINTR;
897
goto mandos_end;
898
}
899
900
do {
901
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
902
if(quit_now){
903
errno = EINTR;
904
goto mandos_end;
905
}
906
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
683
gnutls_bye(session, GNUTLS_SHUT_RDWR);
907
684
908
685
if(buffer_length > 0){
909
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
686
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
911
687
buffer_length,
912
688
&decrypted_buffer);
913
689
if(decrypted_buffer_size >= 0){
914
915
690
written = 0;
916
691
while(written < (size_t) decrypted_buffer_size){
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
692
ret = (int)fwrite(decrypted_buffer + written, 1,
923
693
(size_t)decrypted_buffer_size - written,
924
694
stdout);
925
695
if(ret == 0 and ferror(stdout)){
926
int e = errno;
927
696
if(debug){
928
697
fprintf(stderr, "Error writing encrypted data: %s\n",
929
698
strerror(errno));
930
699
}
931
errno = e;
932
goto mandos_end;
700
retval = -1;
701
break;
933
702
}
934
703
written += (size_t)ret;
935
704
}
936
retval = 0;
705
free(decrypted_buffer);
706
} else {
707
retval = -1;
937
708
}
709
} else {
710
retval = -1;
938
711
}
939
712
940
713
/* Shutdown procedure */
941
714
942
715
mandos_end:
943
{
944
int e = errno;
945
free(decrypted_buffer);
946
free(buffer);
947
if(tcp_sd >= 0){
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
949
}
950
if(ret == -1){
951
if(e == 0){
952
e = errno;
953
}
954
perror_plus("close");
955
}
956
gnutls_deinit(session);
957
errno = e;
958
if(quit_now){
959
errno = EINTR;
960
retval = -1;
961
}
716
free(buffer);
717
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
718
if(ret == -1){
719
perror("close");
962
720
}
721
gnutls_deinit(session);
963
722
return retval;
964
723
}
965
724
966
725
static void resolve_callback(AvahiSServiceResolver *r,
967
726
AvahiIfIndex interface,
968
AvahiProtocol proto,
727
AVAHI_GCC_UNUSED AvahiProtocol protocol,
969
728
AvahiResolverEvent event,
970
729
const char *name,
971
730
const char *type,
976
735
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
736
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
737
flags,
979
AVAHI_GCC_UNUSED void* userdata){
738
void* userdata) {
739
mandos_context *mc = userdata;
980
740
assert(r);
981
741
982
742
/* Called whenever a service has been resolved successfully or
983
743
timed out */
984
744
985
if(quit_now){
986
return;
987
}
988
989
switch(event){
745
switch(event) {
990
746
default:
991
747
case AVAHI_RESOLVER_FAILURE:
992
748
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
749
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
750
avahi_strerror(avahi_server_errno(mc->server)));
995
751
break;
996
752
997
753
case AVAHI_RESOLVER_FOUND:
1003
759
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
760
ip, (intmax_t)interface, port);
1005
761
}
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
762
int ret = start_mandos_communication(ip, port, interface, mc);
1008
763
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1010
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
764
avahi_simple_poll_quit(mc->simple_poll);
1013
765
}
1014
766
}
1015
767
}
1016
768
avahi_s_service_resolver_free(r);
1017
769
}
1018
770
1019
static void browse_callback(AvahiSServiceBrowser *b,
1020
AvahiIfIndex interface,
1021
AvahiProtocol protocol,
1022
AvahiBrowserEvent event,
1023
const char *name,
1024
const char *type,
1025
const char *domain,
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
771
static void browse_callback( AvahiSServiceBrowser *b,
772
AvahiIfIndex interface,
773
AvahiProtocol protocol,
774
AvahiBrowserEvent event,
775
const char *name,
776
const char *type,
777
const char *domain,
778
AVAHI_GCC_UNUSED AvahiLookupResultFlags
779
flags,
780
void* userdata) {
781
mandos_context *mc = userdata;
1029
782
assert(b);
1030
783
1031
784
/* Called whenever a new services becomes available on the LAN or
1032
785
is removed from the LAN */
1033
786
1034
if(quit_now){
1035
return;
1036
}
1037
1038
switch(event){
787
switch(event) {
1039
788
default:
1040
789
case AVAHI_BROWSER_FAILURE:
1041
790
1042
791
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
792
avahi_strerror(avahi_server_errno(mc->server)));
793
avahi_simple_poll_quit(mc->simple_poll);
1045
794
return;
1046
795
1047
796
case AVAHI_BROWSER_NEW:
1050
799
the callback function is called the Avahi server will free the
1051
800
resolver for us. */
1052
801
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
802
if(!(avahi_s_service_resolver_new(mc->server, interface,
803
protocol, name, type, domain,
804
AVAHI_PROTO_INET6, 0,
805
resolve_callback, mc)))
1056
806
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
807
name, avahi_strerror(avahi_server_errno(mc->server)));
1058
808
break;
1059
809
1060
810
case AVAHI_BROWSER_REMOVE:
1069
819
}
1070
820
}
1071
821
1072
/* Signal handler that stops main loop after SIGTERM */
1073
static void handle_sigterm(int sig){
1074
if(quit_now){
1075
return;
1076
}
1077
quit_now = 1;
1078
signal_received = sig;
1079
int old_errno = errno;
1080
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1083
}
1084
errno = old_errno;
1085
}
1086
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1188
}
1189
return 1;
1190
}
1191
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
int ret;
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1208
1209
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1214
}
1215
ret = avahi_simple_poll_iterate(s, -1);
1216
} else {
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1220
}
1221
/* the current time */
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1223
if(ret == -1){
1224
perror_plus("clock_gettime");
1225
return -1;
1226
}
1227
/* Calculating in ms how long time between now and server
1228
who we visted longest time ago. Now - last seen. */
1229
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1231
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1233
/* total time is 10s/10,000ms.
1234
Converting to s from ms by dividing by 1,000,
1235
and ns to ms by dividing by 1,000,000. */
1236
block_time = ((retry_interval
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1242
}
1243
1244
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1249
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
1251
return 0;
1252
}
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1255
if(ret == -1){
1256
perror_plus("clock_gettime");
1257
return -1;
1258
}
1259
mc.current_server = mc.current_server->next;
1260
block_time = 0; /* Call avahi to find new Mandos
1261
servers, but don't block */
1262
}
1263
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
}
1266
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1268
return (ret != 1) ? ret : 0;
1269
}
1270
}
1271
}
1272
}
1273
1274
822
int main(int argc, char *argv[]){
1275
AvahiSServiceBrowser *sb = NULL;
1276
int error;
1277
int ret;
1278
intmax_t tmpmax;
1279
char *tmp;
1280
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
gid_t gid;
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1288
bool tempdir_created = false;
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
const char *seckey = PATHDIR "/" SECKEY;
1291
const char *pubkey = PATHDIR "/" PUBKEY;
1292
1293
bool gnutls_initialized = false;
1294
bool gpgme_initialized = false;
1295
float delay = 2.5f;
1296
double retry_interval = 10; /* 10s between trying a server and
1297
retrying the same server again */
1298
1299
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1300
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1301
1302
uid = getuid();
1303
gid = getgid();
1304
1305
/* Lower any group privileges we might have, just to be safe */
1306
errno = 0;
1307
ret = setgid(gid);
1308
if(ret == -1){
1309
perror_plus("setgid");
1310
}
1311
1312
/* Lower user privileges (temporarily) */
1313
errno = 0;
1314
ret = seteuid(uid);
1315
if(ret == -1){
1316
perror_plus("seteuid");
1317
}
1318
1319
if(quit_now){
1320
goto end;
1321
}
1322
1323
{
1324
struct argp_option options[] = {
1325
{ .name = "debug", .key = 128,
1326
.doc = "Debug mode", .group = 3 },
1327
{ .name = "connect", .key = 'c',
1328
.arg = "ADDRESS:PORT",
1329
.doc = "Connect directly to a specific Mandos server",
1330
.group = 1 },
1331
{ .name = "interface", .key = 'i',
1332
.arg = "NAME",
1333
.doc = "Network interface that will be used to search for"
1334
" Mandos servers",
1335
.group = 1 },
1336
{ .name = "seckey", .key = 's',
1337
.arg = "FILE",
1338
.doc = "OpenPGP secret key file base name",
1339
.group = 1 },
1340
{ .name = "pubkey", .key = 'p',
1341
.arg = "FILE",
1342
.doc = "OpenPGP public key file base name",
1343
.group = 2 },
1344
{ .name = "dh-bits", .key = 129,
1345
.arg = "BITS",
1346
.doc = "Bit length of the prime number used in the"
1347
" Diffie-Hellman key exchange",
1348
.group = 2 },
1349
{ .name = "priority", .key = 130,
1350
.arg = "STRING",
1351
.doc = "GnuTLS priority string for the TLS handshake",
1352
.group = 1 },
1353
{ .name = "delay", .key = 131,
1354
.arg = "SECONDS",
1355
.doc = "Maximum delay to wait for interface startup",
1356
.group = 2 },
1357
{ .name = "retry", .key = 132,
1358
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1360
.group = 2 },
1361
/*
1362
* These reproduce what we would get without ARGP_NO_HELP
1363
*/
1364
{ .name = "help", .key = '?',
1365
.doc = "Give this help list", .group = -1 },
1366
{ .name = "usage", .key = -3,
1367
.doc = "Give a short usage message", .group = -1 },
1368
{ .name = "version", .key = 'V',
1369
.doc = "Print program version", .group = -1 },
1370
{ .name = NULL }
1371
};
1372
1373
error_t parse_opt(int key, char *arg,
1374
struct argp_state *state){
1375
errno = 0;
1376
switch(key){
1377
case 128: /* --debug */
1378
debug = true;
1379
break;
1380
case 'c': /* --connect */
1381
connect_to = arg;
1382
break;
1383
case 'i': /* --interface */
1384
interface = arg;
1385
break;
1386
case 's': /* --seckey */
1387
seckey = arg;
1388
break;
1389
case 'p': /* --pubkey */
1390
pubkey = arg;
1391
break;
1392
case 129: /* --dh-bits */
1393
errno = 0;
1394
tmpmax = strtoimax(arg, &tmp, 10);
1395
if(errno != 0 or tmp == arg or *tmp != '\0'
1396
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1397
argp_error(state, "Bad number of DH bits");
1398
}
1399
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1400
break;
1401
case 130: /* --priority */
1402
mc.priority = arg;
1403
break;
1404
case 131: /* --delay */
1405
errno = 0;
1406
delay = strtof(arg, &tmp);
1407
if(errno != 0 or tmp == arg or *tmp != '\0'){
1408
argp_error(state, "Bad delay");
1409
}
1410
case 132: /* --retry */
1411
errno = 0;
1412
retry_interval = strtod(arg, &tmp);
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1415
argp_error(state, "Bad retry interval");
1416
}
1417
break;
1418
/*
1419
* These reproduce what we would get without ARGP_NO_HELP
1420
*/
1421
case '?': /* --help */
1422
argp_state_help(state, state->out_stream,
1423
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1424
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1425
case -3: /* --usage */
1426
argp_state_help(state, state->out_stream,
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1430
exit(argp_err_exit_status);
1431
break;
1432
default:
1433
return ARGP_ERR_UNKNOWN;
1434
}
1435
return errno;
1436
}
1437
1438
struct argp argp = { .options = options, .parser = parse_opt,
1439
.args_doc = "",
1440
.doc = "Mandos client -- Get and decrypt"
1441
" passwords from a Mandos server" };
1442
ret = argp_parse(&argp, argc, argv,
1443
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1444
switch(ret){
1445
case 0:
1446
break;
1447
case ENOMEM:
1448
default:
1449
errno = ret;
1450
perror_plus("argp_parse");
1451
exitcode = EX_OSERR;
1452
goto end;
1453
case EINVAL:
1454
exitcode = EX_USAGE;
1455
goto end;
1456
}
1457
}
1458
1459
if(not debug){
1460
avahi_set_log_function(empty_log);
1461
}
1462
1463
if(interface[0] == '\0'){
1464
struct dirent **direntries;
1465
ret = scandir(sys_class_net, &direntries, good_interface,
1466
alphasort);
1467
if(ret >= 1){
1468
/* Pick the first good interface */
1469
interface = strdup(direntries[0]->d_name);
1470
if(debug){
1471
fprintf(stderr, "Using interface \"%s\"\n", interface);
1472
}
1473
if(interface == NULL){
1474
perror_plus("malloc");
1475
free(direntries);
1476
exitcode = EXIT_FAILURE;
1477
goto end;
1478
}
1479
free(direntries);
1480
} else {
1481
free(direntries);
1482
fprintf(stderr, "Could not find a network interface\n");
1483
exitcode = EXIT_FAILURE;
1484
goto end;
1485
}
1486
}
1487
1488
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1489
from the signal handler */
1490
/* Initialize the pseudo-RNG for Avahi */
1491
srand((unsigned int) time(NULL));
1492
mc.simple_poll = avahi_simple_poll_new();
1493
if(mc.simple_poll == NULL){
1494
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1495
exitcode = EX_UNAVAILABLE;
1496
goto end;
1497
}
1498
1499
sigemptyset(&sigterm_action.sa_mask);
1500
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1501
if(ret == -1){
1502
perror_plus("sigaddset");
1503
exitcode = EX_OSERR;
1504
goto end;
1505
}
1506
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1507
if(ret == -1){
1508
perror_plus("sigaddset");
1509
exitcode = EX_OSERR;
1510
goto end;
1511
}
1512
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1513
if(ret == -1){
1514
perror_plus("sigaddset");
1515
exitcode = EX_OSERR;
1516
goto end;
1517
}
1518
/* Need to check if the handler is SIG_IGN before handling:
1519
| [[info:libc:Initial Signal Actions]] |
1520
| [[info:libc:Basic Signal Handling]] |
1521
*/
1522
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1523
if(ret == -1){
1524
perror_plus("sigaction");
1525
return EX_OSERR;
1526
}
1527
if(old_sigterm_action.sa_handler != SIG_IGN){
1528
ret = sigaction(SIGINT, &sigterm_action, NULL);
1529
if(ret == -1){
1530
perror_plus("sigaction");
1531
exitcode = EX_OSERR;
1532
goto end;
1533
}
1534
}
1535
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1536
if(ret == -1){
1537
perror_plus("sigaction");
1538
return EX_OSERR;
1539
}
1540
if(old_sigterm_action.sa_handler != SIG_IGN){
1541
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1542
if(ret == -1){
1543
perror_plus("sigaction");
1544
exitcode = EX_OSERR;
1545
goto end;
1546
}
1547
}
1548
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1549
if(ret == -1){
1550
perror_plus("sigaction");
1551
return EX_OSERR;
1552
}
1553
if(old_sigterm_action.sa_handler != SIG_IGN){
1554
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1555
if(ret == -1){
1556
perror_plus("sigaction");
1557
exitcode = EX_OSERR;
1558
goto end;
1559
}
1560
}
1561
1562
/* If the interface is down, bring it up */
1563
if(strcmp(interface, "none") != 0){
823
AvahiSServiceBrowser *sb = NULL;
824
int error;
825
int ret;
826
intmax_t tmpmax;
827
int numchars;
828
int exitcode = EXIT_SUCCESS;
829
const char *interface = "eth0";
830
struct ifreq network;
831
int sd;
832
uid_t uid;
833
gid_t gid;
834
char *connect_to = NULL;
835
char tempdir[] = "/tmp/mandosXXXXXX";
836
bool tempdir_created = false;
837
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
838
const char *seckey = PATHDIR "/" SECKEY;
839
const char *pubkey = PATHDIR "/" PUBKEY;
840
841
mandos_context mc = { .simple_poll = NULL, .server = NULL,
842
.dh_bits = 1024, .priority = "SECURE256"
843
":!CTYPE-X.509:+CTYPE-OPENPGP" };
844
bool gnutls_initialized = false;
845
bool gpgme_initialized = false;
846
double delay = 2.5;
847
848
{
849
struct argp_option options[] = {
850
{ .name = "debug", .key = 128,
851
.doc = "Debug mode", .group = 3 },
852
{ .name = "connect", .key = 'c',
853
.arg = "ADDRESS:PORT",
854
.doc = "Connect directly to a specific Mandos server",
855
.group = 1 },
856
{ .name = "interface", .key = 'i',
857
.arg = "NAME",
858
.doc = "Interface that will be used to search for Mandos"
859
" servers",
860
.group = 1 },
861
{ .name = "seckey", .key = 's',
862
.arg = "FILE",
863
.doc = "OpenPGP secret key file base name",
864
.group = 1 },
865
{ .name = "pubkey", .key = 'p',
866
.arg = "FILE",
867
.doc = "OpenPGP public key file base name",
868
.group = 2 },
869
{ .name = "dh-bits", .key = 129,
870
.arg = "BITS",
871
.doc = "Bit length of the prime number used in the"
872
" Diffie-Hellman key exchange",
873
.group = 2 },
874
{ .name = "priority", .key = 130,
875
.arg = "STRING",
876
.doc = "GnuTLS priority string for the TLS handshake",
877
.group = 1 },
878
{ .name = "delay", .key = 131,
879
.arg = "SECONDS",
880
.doc = "Maximum delay to wait for interface startup",
881
.group = 2 },
882
{ .name = NULL }
883
};
884
885
error_t parse_opt(int key, char *arg,
886
struct argp_state *state) {
887
switch(key) {
888
case 128: /* --debug */
889
debug = true;
890
break;
891
case 'c': /* --connect */
892
connect_to = arg;
893
break;
894
case 'i': /* --interface */
895
interface = arg;
896
break;
897
case 's': /* --seckey */
898
seckey = arg;
899
break;
900
case 'p': /* --pubkey */
901
pubkey = arg;
902
break;
903
case 129: /* --dh-bits */
904
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
905
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
906
or arg[numchars] != '\0'){
907
fprintf(stderr, "Bad number of DH bits\n");
908
exit(EXIT_FAILURE);
909
}
910
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
911
break;
912
case 130: /* --priority */
913
mc.priority = arg;
914
break;
915
case 131: /* --delay */
916
ret = sscanf(arg, "%lf%n", &delay, &numchars);
917
if(ret < 1 or arg[numchars] != '\0'){
918
fprintf(stderr, "Bad delay\n");
919
exit(EXIT_FAILURE);
920
}
921
break;
922
case ARGP_KEY_ARG:
923
argp_usage(state);
924
case ARGP_KEY_END:
925
break;
926
default:
927
return ARGP_ERR_UNKNOWN;
928
}
929
return 0;
930
}
931
932
struct argp argp = { .options = options, .parser = parse_opt,
933
.args_doc = "",
934
.doc = "Mandos client -- Get and decrypt"
935
" passwords from a Mandos server" };
936
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
937
if(ret == ARGP_ERR_UNKNOWN){
938
fprintf(stderr, "Unknown error while parsing arguments\n");
939
exitcode = EXIT_FAILURE;
940
goto end;
941
}
942
}
943
944
/* If the interface is down, bring it up */
945
{
946
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
947
messages to mess up the prompt */
948
ret = klogctl(8, NULL, 5);
949
if(ret == -1){
950
perror("klogctl");
951
}
952
953
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
954
if(sd < 0) {
955
perror("socket");
956
exitcode = EXIT_FAILURE;
957
ret = klogctl(7, NULL, 0);
958
if(ret == -1){
959
perror("klogctl");
960
}
961
goto end;
962
}
963
strcpy(network.ifr_name, interface);
964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
965
if(ret == -1){
966
perror("ioctl SIOCGIFFLAGS");
967
ret = klogctl(7, NULL, 0);
968
if(ret == -1){
969
perror("klogctl");
970
}
971
exitcode = EXIT_FAILURE;
972
goto end;
973
}
974
if((network.ifr_flags & IFF_UP) == 0){
975
network.ifr_flags |= IFF_UP;
976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
977
if(ret == -1){
978
perror("ioctl SIOCSIFFLAGS");
979
exitcode = EXIT_FAILURE;
980
ret = klogctl(7, NULL, 0);
981
if(ret == -1){
982
perror("klogctl");
983
}
984
goto end;
985
}
986
}
987
/* sleep checking until interface is running */
988
for(int i=0; i < delay * 4; i++){
989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
990
if(ret == -1){
991
perror("ioctl SIOCGIFFLAGS");
992
} else if(network.ifr_flags & IFF_RUNNING){
993
break;
994
}
995
struct timespec sleeptime = { .tv_nsec = 250000000 };
996
nanosleep(&sleeptime, NULL);
997
}
998
ret = (int)TEMP_FAILURE_RETRY(close(sd));
999
if(ret == -1){
1000
perror("close");
1001
}
1002
/* Restores kernel loglevel to default */
1003
ret = klogctl(7, NULL, 0);
1004
if(ret == -1){
1005
perror("klogctl");
1006
}
1007
}
1008
1009
uid = getuid();
1010
gid = getgid();
1011
1012
setgid(gid);
1013
if(ret == -1){
1014
perror("setgid");
1015
}
1016
1017
ret = setuid(uid);
1018
if(ret == -1){
1019
perror("setuid");
1020
}
1021
1022
ret = init_gnutls_global(&mc, pubkey, seckey);
1023
if(ret == -1){
1024
fprintf(stderr, "init_gnutls_global failed\n");
1025
exitcode = EXIT_FAILURE;
1026
goto end;
1027
} else {
1028
gnutls_initialized = true;
1029
}
1030
1031
if(mkdtemp(tempdir) == NULL){
1032
perror("mkdtemp");
1033
goto end;
1034
}
1035
tempdir_created = true;
1036
1037
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1038
fprintf(stderr, "init_gpgme failed\n");
1039
exitcode = EXIT_FAILURE;
1040
goto end;
1041
} else {
1042
gpgme_initialized = true;
1043
}
1044
1564
1045
if_index = (AvahiIfIndex) if_nametoindex(interface);
1565
1046
if(if_index == 0){
1566
1047
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1567
exitcode = EX_UNAVAILABLE;
1568
goto end;
1569
}
1570
1571
if(quit_now){
1572
goto end;
1573
}
1574
1575
/* Re-raise priviliges */
1576
errno = 0;
1577
ret = seteuid(0);
1578
if(ret == -1){
1579
perror_plus("seteuid");
1580
}
1581
1582
#ifdef __linux__
1583
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1584
messages about the network interface to mess up the prompt */
1585
ret = klogctl(8, NULL, 5);
1586
bool restore_loglevel = true;
1587
if(ret == -1){
1588
restore_loglevel = false;
1589
perror_plus("klogctl");
1590
}
1591
#endif /* __linux__ */
1592
1593
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1594
if(sd < 0){
1595
perror_plus("socket");
1596
exitcode = EX_OSERR;
1597
#ifdef __linux__
1598
if(restore_loglevel){
1599
ret = klogctl(7, NULL, 0);
1600
if(ret == -1){
1601
perror_plus("klogctl");
1602
}
1603
}
1604
#endif /* __linux__ */
1605
/* Lower privileges */
1606
errno = 0;
1607
ret = seteuid(uid);
1608
if(ret == -1){
1609
perror_plus("seteuid");
1610
}
1611
goto end;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
perror_plus("ioctl SIOCGIFFLAGS");
1617
#ifdef __linux__
1618
if(restore_loglevel){
1619
ret = klogctl(7, NULL, 0);
1620
if(ret == -1){
1621
perror_plus("klogctl");
1622
}
1623
}
1624
#endif /* __linux__ */
1625
exitcode = EX_OSERR;
1626
/* Lower privileges */
1627
errno = 0;
1628
ret = seteuid(uid);
1629
if(ret == -1){
1630
perror_plus("seteuid");
1631
}
1632
goto end;
1633
}
1634
if((network.ifr_flags & IFF_UP) == 0){
1635
network.ifr_flags |= IFF_UP;
1636
take_down_interface = true;
1637
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1638
if(ret == -1){
1639
take_down_interface = false;
1640
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1641
exitcode = EX_OSERR;
1642
#ifdef __linux__
1643
if(restore_loglevel){
1644
ret = klogctl(7, NULL, 0);
1645
if(ret == -1){
1646
perror_plus("klogctl");
1647
}
1648
}
1649
#endif /* __linux__ */
1650
/* Lower privileges */
1651
errno = 0;
1652
ret = seteuid(uid);
1653
if(ret == -1){
1654
perror_plus("seteuid");
1655
}
1656
goto end;
1657
}
1658
}
1659
/* Sleep checking until interface is running.
1660
Check every 0.25s, up to total time of delay */
1661
for(int i=0; i < delay * 4; i++){
1662
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1663
if(ret == -1){
1664
perror_plus("ioctl SIOCGIFFLAGS");
1665
} else if(network.ifr_flags & IFF_RUNNING){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
if(not take_down_interface){
1675
/* We won't need the socket anymore */
1676
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1677
if(ret == -1){
1678
perror_plus("close");
1679
}
1680
}
1681
#ifdef __linux__
1682
if(restore_loglevel){
1683
/* Restores kernel loglevel to default */
1684
ret = klogctl(7, NULL, 0);
1685
if(ret == -1){
1686
perror_plus("klogctl");
1687
}
1688
}
1689
#endif /* __linux__ */
1690
/* Lower privileges */
1691
errno = 0;
1692
if(take_down_interface){
1693
/* Lower privileges */
1694
ret = seteuid(uid);
1695
if(ret == -1){
1696
perror_plus("seteuid");
1697
}
1698
} else {
1699
/* Lower privileges permanently */
1700
ret = setuid(uid);
1701
if(ret == -1){
1702
perror_plus("setuid");
1703
}
1704
}
1705
}
1706
1707
if(quit_now){
1708
goto end;
1709
}
1710
1711
ret = init_gnutls_global(pubkey, seckey);
1712
if(ret == -1){
1713
fprintf(stderr, "init_gnutls_global failed\n");
1714
exitcode = EX_UNAVAILABLE;
1715
goto end;
1716
} else {
1717
gnutls_initialized = true;
1718
}
1719
1720
if(quit_now){
1721
goto end;
1722
}
1723
1724
if(mkdtemp(tempdir) == NULL){
1725
perror_plus("mkdtemp");
1726
goto end;
1727
}
1728
tempdir_created = true;
1729
1730
if(quit_now){
1731
goto end;
1732
}
1733
1734
if(not init_gpgme(pubkey, seckey, tempdir)){
1735
fprintf(stderr, "init_gpgme failed\n");
1736
exitcode = EX_UNAVAILABLE;
1737
goto end;
1738
} else {
1739
gpgme_initialized = true;
1740
}
1741
1742
if(quit_now){
1743
goto end;
1744
}
1745
1746
if(connect_to != NULL){
1747
/* Connect directly, do not use Zeroconf */
1748
/* (Mainly meant for debugging) */
1749
char *address = strrchr(connect_to, ':');
1750
if(address == NULL){
1751
fprintf(stderr, "No colon in address\n");
1752
exitcode = EX_USAGE;
1753
goto end;
1754
}
1755
1756
if(quit_now){
1757
goto end;
1758
}
1759
1760
uint16_t port;
1761
errno = 0;
1762
tmpmax = strtoimax(address+1, &tmp, 10);
1763
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1764
or tmpmax != (uint16_t)tmpmax){
1765
fprintf(stderr, "Bad port number\n");
1766
exitcode = EX_USAGE;
1767
goto end;
1768
}
1769
1770
if(quit_now){
1771
goto end;
1772
}
1773
1774
port = (uint16_t)tmpmax;
1775
*address = '\0';
1776
address = connect_to;
1777
/* Colon in address indicates IPv6 */
1778
int af;
1779
if(strchr(address, ':') != NULL){
1780
af = AF_INET6;
1781
} else {
1782
af = AF_INET;
1783
}
1784
1785
if(quit_now){
1786
goto end;
1787
}
1788
1789
while(not quit_now){
1790
ret = start_mandos_communication(address, port, if_index, af);
1791
if(quit_now or ret == 0){
1792
break;
1793
}
1794
sleep((int)retry_interval or 1);
1795
};
1796
1797
if (not quit_now){
1798
exitcode = EXIT_SUCCESS;
1799
}
1800
1801
goto end;
1802
}
1803
1804
if(quit_now){
1805
goto end;
1806
}
1807
1808
{
1809
AvahiServerConfig config;
1810
/* Do not publish any local Zeroconf records */
1811
avahi_server_config_init(&config);
1812
config.publish_hinfo = 0;
1813
config.publish_addresses = 0;
1814
config.publish_workstation = 0;
1815
config.publish_domain = 0;
1816
1817
/* Allocate a new server */
1818
mc.server = avahi_server_new(avahi_simple_poll_get
1819
(mc.simple_poll), &config, NULL,
1820
NULL, &error);
1821
1822
/* Free the Avahi configuration data */
1823
avahi_server_config_free(&config);
1824
}
1825
1826
/* Check if creating the Avahi server object succeeded */
1827
if(mc.server == NULL){
1828
fprintf(stderr, "Failed to create Avahi server: %s\n",
1829
avahi_strerror(error));
1830
exitcode = EX_UNAVAILABLE;
1831
goto end;
1832
}
1833
1834
if(quit_now){
1835
goto end;
1836
}
1837
1838
/* Create the Avahi service browser */
1839
sb = avahi_s_service_browser_new(mc.server, if_index,
1840
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1841
NULL, 0, browse_callback, NULL);
1842
if(sb == NULL){
1843
fprintf(stderr, "Failed to create service browser: %s\n",
1844
avahi_strerror(avahi_server_errno(mc.server)));
1845
exitcode = EX_UNAVAILABLE;
1846
goto end;
1847
}
1848
1849
if(quit_now){
1850
goto end;
1851
}
1852
1853
/* Run the main loop */
1854
1855
if(debug){
1856
fprintf(stderr, "Starting Avahi loop search\n");
1857
}
1858
1859
ret = avahi_loop_with_timeout(mc.simple_poll,
1860
(int)(retry_interval * 1000));
1861
if(debug){
1862
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1863
(ret == 0) ? "successfully" : "with error");
1864
}
1865
1048
exitcode = EXIT_FAILURE;
1049
goto end;
1050
}
1051
1052
if(connect_to != NULL){
1053
/* Connect directly, do not use Zeroconf */
1054
/* (Mainly meant for debugging) */
1055
char *address = strrchr(connect_to, ':');
1056
if(address == NULL){
1057
fprintf(stderr, "No colon in address\n");
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
uint16_t port;
1062
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1063
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1064
or address[numchars+1] != '\0'){
1065
fprintf(stderr, "Bad port number\n");
1066
exitcode = EXIT_FAILURE;
1067
goto end;
1068
}
1069
port = (uint16_t)tmpmax;
1070
*address = '\0';
1071
address = connect_to;
1072
ret = start_mandos_communication(address, port, if_index, &mc);
1073
if(ret < 0){
1074
exitcode = EXIT_FAILURE;
1075
} else {
1076
exitcode = EXIT_SUCCESS;
1077
}
1078
goto end;
1079
}
1080
1081
if(not debug){
1082
avahi_set_log_function(empty_log);
1083
}
1084
1085
/* Initialize the pseudo-RNG for Avahi */
1086
srand((unsigned int) time(NULL));
1087
1088
/* Allocate main Avahi loop object */
1089
mc.simple_poll = avahi_simple_poll_new();
1090
if(mc.simple_poll == NULL) {
1091
fprintf(stderr, "Avahi: Failed to create simple poll"
1092
" object.\n");
1093
exitcode = EXIT_FAILURE;
1094
goto end;
1095
}
1096
1097
{
1098
AvahiServerConfig config;
1099
/* Do not publish any local Zeroconf records */
1100
avahi_server_config_init(&config);
1101
config.publish_hinfo = 0;
1102
config.publish_addresses = 0;
1103
config.publish_workstation = 0;
1104
config.publish_domain = 0;
1105
1106
/* Allocate a new server */
1107
mc.server = avahi_server_new(avahi_simple_poll_get
1108
(mc.simple_poll), &config, NULL,
1109
NULL, &error);
1110
1111
/* Free the Avahi configuration data */
1112
avahi_server_config_free(&config);
1113
}
1114
1115
/* Check if creating the Avahi server object succeeded */
1116
if(mc.server == NULL) {
1117
fprintf(stderr, "Failed to create Avahi server: %s\n",
1118
avahi_strerror(error));
1119
exitcode = EXIT_FAILURE;
1120
goto end;
1121
}
1122
1123
/* Create the Avahi service browser */
1124
sb = avahi_s_service_browser_new(mc.server, if_index,
1125
AVAHI_PROTO_INET6,
1126
"_mandos._tcp", NULL, 0,
1127
browse_callback, &mc);
1128
if(sb == NULL) {
1129
fprintf(stderr, "Failed to create service browser: %s\n",
1130
avahi_strerror(avahi_server_errno(mc.server)));
1131
exitcode = EXIT_FAILURE;
1132
goto end;
1133
}
1134
1135
/* Run the main loop */
1136
1137
if(debug){
1138
fprintf(stderr, "Starting Avahi loop search\n");
1139
}
1140
1141
avahi_simple_poll_loop(mc.simple_poll);
1142
1866
1143
end:
1867
1868
if(debug){
1869
fprintf(stderr, "%s exiting\n", argv[0]);
1870
}
1871
1872
/* Cleanup things */
1873
if(sb != NULL)
1874
avahi_s_service_browser_free(sb);
1875
1876
if(mc.server != NULL)
1877
avahi_server_free(mc.server);
1878
1879
if(mc.simple_poll != NULL)
1880
avahi_simple_poll_free(mc.simple_poll);
1881
1882
if(gnutls_initialized){
1883
gnutls_certificate_free_credentials(mc.cred);
1884
gnutls_global_deinit();
1885
gnutls_dh_params_deinit(mc.dh_params);
1886
}
1887
1888
if(gpgme_initialized){
1889
gpgme_release(mc.ctx);
1890
}
1891
1892
/* Cleans up the circular linked list of Mandos servers the client
1893
has seen */
1894
if(mc.current_server != NULL){
1895
mc.current_server->prev->next = NULL;
1896
while(mc.current_server != NULL){
1897
server *next = mc.current_server->next;
1898
free(mc.current_server);
1899
mc.current_server = next;
1900
}
1901
}
1902
1903
/* Take down the network interface */
1904
if(take_down_interface){
1905
/* Re-raise priviliges */
1906
errno = 0;
1907
ret = seteuid(0);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
if(geteuid() == 0){
1912
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1913
if(ret == -1){
1914
perror_plus("ioctl SIOCGIFFLAGS");
1915
} else if(network.ifr_flags & IFF_UP) {
1916
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1917
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1920
}
1921
}
1922
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1923
if(ret == -1){
1924
perror_plus("close");
1925
}
1926
/* Lower privileges permanently */
1927
errno = 0;
1928
ret = setuid(uid);
1929
if(ret == -1){
1930
perror_plus("setuid");
1931
}
1932
}
1933
}
1934
1935
/* Removes the GPGME temp directory and all files inside */
1936
if(tempdir_created){
1937
struct dirent **direntries = NULL;
1938
struct dirent *direntry = NULL;
1939
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1940
if (ret > 0){
1941
for(int i = 0; i < ret; i++){
1942
direntry = direntries[i];
1943
char *fullname = NULL;
1944
ret = asprintf(&fullname, "%s/%s", tempdir,
1945
direntry->d_name);
1946
if(ret < 0){
1947
perror_plus("asprintf");
1948
continue;
1949
}
1950
ret = remove(fullname);
1951
if(ret == -1){
1952
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1953
strerror(errno));
1954
}
1955
free(fullname);
1956
}
1957
}
1958
1959
/* need to be cleaned even if ret == 0 because man page doesn't
1960
specify */
1961
free(direntries);
1962
if (ret == -1){
1963
perror_plus("scandir");
1964
}
1965
ret = rmdir(tempdir);
1966
if(ret == -1 and errno != ENOENT){
1967
perror_plus("rmdir");
1968
}
1969
}
1970
1971
if(quit_now){
1972
sigemptyset(&old_sigterm_action.sa_mask);
1973
old_sigterm_action.sa_handler = SIG_DFL;
1974
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1975
&old_sigterm_action,
1976
NULL));
1977
if(ret == -1){
1978
perror_plus("sigaction");
1979
}
1980
do {
1981
ret = raise(signal_received);
1982
} while(ret != 0 and errno == EINTR);
1983
if(ret != 0){
1984
perror_plus("raise");
1985
abort();
1986
}
1987
TEMP_FAILURE_RETRY(pause());
1988
}
1989
1990
return exitcode;
1144
1145
if(debug){
1146
fprintf(stderr, "%s exiting\n", argv[0]);
1147
}
1148
1149
/* Cleanup things */
1150
if(sb != NULL)
1151
avahi_s_service_browser_free(sb);
1152
1153
if(mc.server != NULL)
1154
avahi_server_free(mc.server);
1155
1156
if(mc.simple_poll != NULL)
1157
avahi_simple_poll_free(mc.simple_poll);
1158
1159
if(gnutls_initialized){
1160
gnutls_certificate_free_credentials(mc.cred);
1161
gnutls_global_deinit();
1162
gnutls_dh_params_deinit(mc.dh_params);
1163
}
1164
1165
if(gpgme_initialized){
1166
gpgme_release(mc.ctx);
1167
}
1168
1169
/* Removes the temp directory used by GPGME */
1170
if(tempdir_created){
1171
DIR *d;
1172
struct dirent *direntry;
1173
d = opendir(tempdir);
1174
if(d == NULL){
1175
if(errno != ENOENT){
1176
perror("opendir");
1177
}
1178
} else {
1179
while(true){
1180
direntry = readdir(d);
1181
if(direntry == NULL){
1182
break;
1183
}
1184
/* Skip "." and ".." */
1185
if(direntry->d_name[0] == '.'
1186
and (direntry->d_name[1] == '\0'
1187
or (direntry->d_name[1] == '.'
1188
and direntry->d_name[2] == '\0'))){
1189
continue;
1190
}
1191
char *fullname = NULL;
1192
ret = asprintf(&fullname, "%s/%s", tempdir,
1193
direntry->d_name);
1194
if(ret < 0){
1195
perror("asprintf");
1196
continue;
1197
}
1198
ret = remove(fullname);
1199
if(ret == -1){
1200
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1201
strerror(errno));
1202
}
1203
free(fullname);
1204
}
1205
closedir(d);
1206
}
1207
ret = rmdir(tempdir);
1208
if(ret == -1 and errno != ENOENT){
1209
perror("rmdir");
1210
}
1211
}
1212
1213
return exitcode;
1991
1214
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0