To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 487
- compare with another revision
- download diff
- download tarball
- view history from revision 487
- Committer: Teddy Hogeborn
- Date: 2011-07-16 00:29:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20110716002919-r77yikuiulj42o40
* initramfs-tools-script: Abort if plugin-runner is missing. Removed
workaround for Debian bug #633582; the
workaround required getopt, which can not be
guaranteed.
* plugin-runner.c (main): Work around Debian bug #633582.
* plugins.d/mandos-client.c (main): - '' -
workaround for Debian bug #633582; the
workaround required getopt, which can not be
guaranteed.
* plugin-runner.c (main): Work around Debian bug #633582.
* plugins.d/mandos-client.c (main): - '' -
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
49
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
53
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
54
56
#include <sys/stat.h> /* open() */
55
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
57
connect() */
58
inet_pton(), connect() */
58
59
#include <fcntl.h> /* open() */
59
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
61
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
62
64
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
69
SIOCSIFFLAGS, if_indextoname(),
67
70
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
78
89
#ifdef __linux__
79
90
#include <sys/klog.h> /* klogctl() */
80
#endif
91
#endif /* __linux__ */
81
92
82
93
/* Avahi */
83
94
/* All Avahi types, constants and functions
117
128
static const char mandos_protocol_version[] = "1";
118
129
const char *argp_program_version = "mandos-client " VERSION;
119
130
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;
120
144
121
145
/* Used for passing in values through the Avahi callback functions */
122
146
typedef struct {
127
151
gnutls_dh_params_t dh_params;
128
152
const char *priority;
129
153
gpgme_ctx_t ctx;
154
server *current_server;
130
155
} mandos_context;
131
156
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
132
173
/*
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
* bytes. "buffer_capacity" is how much is currently allocated,
135
176
* "buffer_length" is how much is already used.
136
177
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
178
size_t incbuffer(char **buffer, size_t buffer_length,
138
179
size_t buffer_capacity){
139
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
146
187
return buffer_capacity;
147
188
}
148
189
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
149
227
/*
150
228
* Initialize GPGME.
151
229
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
230
static bool init_gpgme(const char *seckey,
153
231
const char *pubkey, const char *tempdir){
154
int ret;
155
232
gpgme_error_t rc;
156
233
gpgme_engine_info_t engine_info;
157
234
160
237
* Helper function to insert pub and seckey to the engine keyring.
161
238
*/
162
239
bool import_key(const char *filename){
240
int ret;
163
241
int fd;
164
242
gpgme_data_t pgp_data;
165
243
166
244
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
167
245
if(fd == -1){
168
perror("open");
246
perror_plus("open");
169
247
return false;
170
248
}
171
249
176
254
return false;
177
255
}
178
256
179
rc = gpgme_op_import(mc->ctx, pgp_data);
257
rc = gpgme_op_import(mc.ctx, pgp_data);
180
258
if(rc != GPG_ERR_NO_ERROR){
181
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
260
gpgme_strsource(rc), gpgme_strerror(rc));
185
263
186
264
ret = (int)TEMP_FAILURE_RETRY(close(fd));
187
265
if(ret == -1){
188
perror("close");
266
perror_plus("close");
189
267
}
190
268
gpgme_data_release(pgp_data);
191
269
return true;
192
270
}
193
271
194
272
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
273
fprintf(stderr, "Initializing GPGME\n");
196
274
}
197
275
198
276
/* Init GPGME */
225
303
}
226
304
227
305
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
306
rc = gpgme_new(&(mc.ctx));
229
307
if(rc != GPG_ERR_NO_ERROR){
230
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
309
gpgme_strsource(rc), gpgme_strerror(rc));
236
314
return false;
237
315
}
238
316
239
return true;
317
return true;
240
318
}
241
319
242
320
/*
243
321
* Decrypt OpenPGP data.
244
322
* Returns -1 on error
245
323
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
325
size_t crypto_size,
249
326
char **plaintext){
250
327
gpgme_data_t dh_crypto, dh_plain;
277
354
278
355
/* Decrypt data from the cryptotext data buffer to the plaintext
279
356
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
358
if(rc != GPG_ERR_NO_ERROR){
282
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
360
gpgme_strsource(rc), gpgme_strerror(rc));
284
361
plaintext_length = -1;
285
362
if(debug){
286
363
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
364
result = gpgme_op_decrypt_result(mc.ctx);
288
365
if(result == NULL){
289
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
290
367
} else {
297
374
}
298
375
gpgme_recipient_t recipient;
299
376
recipient = result->recipients;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
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;
310
385
}
311
386
}
312
387
}
319
394
320
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
321
396
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
322
perror("gpgme_data_seek");
397
perror_plus("gpgme_data_seek");
323
398
plaintext_length = -1;
324
399
goto decrypt_end;
325
400
}
326
401
327
402
*plaintext = NULL;
328
403
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
404
plaintext_capacity = incbuffer(plaintext,
330
405
(size_t)plaintext_length,
331
406
plaintext_capacity);
332
407
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
408
perror_plus("incbuffer");
334
409
plaintext_length = -1;
335
410
goto decrypt_end;
336
411
}
343
418
break;
344
419
}
345
420
if(ret < 0){
346
perror("gpgme_data_read");
421
perror_plus("gpgme_data_read");
347
422
plaintext_length = -1;
348
423
goto decrypt_end;
349
424
}
382
457
fprintf(stderr, "GnuTLS: %s", string);
383
458
}
384
459
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
460
static int init_gnutls_global(const char *pubkeyfilename,
387
461
const char *seckeyfilename){
388
462
int ret;
389
463
407
481
}
408
482
409
483
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
411
485
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
486
fprintf(stderr, "GnuTLS memory error: %s\n",
416
487
safer_gnutls_strerror(ret));
417
488
gnutls_global_deinit();
418
489
return -1;
425
496
}
426
497
427
498
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
429
500
GNUTLS_OPENPGP_FMT_BASE64);
430
501
if(ret != GNUTLS_E_SUCCESS){
431
502
fprintf(stderr,
437
508
}
438
509
439
510
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
441
512
if(ret != GNUTLS_E_SUCCESS){
442
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
514
" %s\n", safer_gnutls_strerror(ret));
444
515
goto globalfail;
445
516
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
518
if(ret != GNUTLS_E_SUCCESS){
448
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
520
safer_gnutls_strerror(ret));
450
521
goto globalfail;
451
522
}
452
523
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
525
455
526
return 0;
456
527
457
528
globalfail:
458
529
459
gnutls_certificate_free_credentials(mc->cred);
530
gnutls_certificate_free_credentials(mc.cred);
460
531
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_dh_params_deinit(mc.dh_params);
462
533
return -1;
463
534
}
464
535
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
536
static int init_gnutls_session(gnutls_session_t *session){
467
537
int ret;
468
538
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
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);
470
545
if(ret != GNUTLS_E_SUCCESS){
471
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
547
safer_gnutls_strerror(ret));
474
549
475
550
{
476
551
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &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);
478
559
if(ret != GNUTLS_E_SUCCESS){
479
560
fprintf(stderr, "Syntax error at: %s\n", err);
480
561
fprintf(stderr, "GnuTLS error: %s\n",
484
565
}
485
566
}
486
567
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
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);
489
576
if(ret != GNUTLS_E_SUCCESS){
490
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
578
safer_gnutls_strerror(ret));
494
581
}
495
582
496
583
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
585
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
587
502
588
return 0;
503
589
}
509
595
/* Called when a Mandos server is found */
510
596
static int start_mandos_communication(const char *ip, uint16_t port,
511
597
AvahiIfIndex if_index,
512
mandos_context *mc){
513
int ret, tcp_sd;
598
int af){
599
int ret, tcp_sd = -1;
514
600
ssize_t sret;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
516
605
char *buffer = NULL;
517
char *decrypted_buffer;
606
char *decrypted_buffer = NULL;
518
607
size_t buffer_length = 0;
519
608
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
521
609
size_t written;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
610
int retval = -1;
524
611
gnutls_session_t session;
525
526
ret = init_gnutls_session(mc, &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);
527
635
if(ret != 0){
528
636
return -1;
529
637
}
530
638
531
639
if(debug){
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
533
641
"\n", ip, port);
534
642
}
535
643
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
537
645
if(tcp_sd < 0){
538
perror("socket");
539
return -1;
646
int e = errno;
647
perror_plus("socket");
648
errno = e;
649
goto mandos_end;
540
650
}
541
651
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
652
if(quit_now){
653
errno = EINTR;
654
goto mandos_end;
548
655
}
549
656
550
657
memset(&to, 0, sizeof(to));
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
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
}
555
665
if(ret < 0 ){
556
perror("inet_pton");
557
return -1;
666
int e = errno;
667
perror_plus("inet_pton");
668
errno = e;
669
goto mandos_end;
558
670
}
559
671
if(ret == 0){
672
int e = errno;
560
673
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
674
errno = e;
675
goto mandos_end;
562
676
}
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
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
564
696
-Wconversion and
565
697
-Wunreachable-code */
698
}
566
699
567
to.in6.sin6_scope_id = (uint32_t)if_index;
700
if(quit_now){
701
errno = EINTR;
702
goto mandos_end;
703
}
568
704
569
705
if(debug){
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
575
perror("inet_ntop");
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");
576
730
} else {
577
731
if(strcmp(addrstr, ip) != 0){
578
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
580
734
}
581
735
}
582
736
583
ret = connect(tcp_sd, &to.in, sizeof(to));
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
}
584
747
if(ret < 0){
585
perror("connect");
586
return -1;
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;
587
759
}
588
760
589
761
const char *out = mandos_protocol_version;
593
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
594
766
out_size - written));
595
767
if(ret == -1){
596
perror("write");
597
retval = -1;
768
int e = errno;
769
perror_plus("write");
770
errno = e;
598
771
goto mandos_end;
599
772
}
600
773
written += (size_t)ret;
608
781
break;
609
782
}
610
783
}
784
785
if(quit_now){
786
errno = EINTR;
787
goto mandos_end;
788
}
611
789
}
612
790
613
791
if(debug){
614
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
793
}
616
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
798
}
799
800
/* Spurious warning from -Wint-to-pointer-cast */
617
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
618
802
619
do{
803
if(quit_now){
804
errno = EINTR;
805
goto mandos_end;
806
}
807
808
do {
620
809
ret = gnutls_handshake(session);
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
621
814
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
622
815
623
816
if(ret != GNUTLS_E_SUCCESS){
625
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
626
819
gnutls_perror(ret);
627
820
}
628
retval = -1;
821
errno = EPROTO;
629
822
goto mandos_end;
630
823
}
631
824
632
825
/* Read OpenPGP packet that contains the wanted password */
633
826
634
827
if(debug){
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
636
829
ip);
637
830
}
638
831
639
832
while(true){
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
buffer_capacity = incbuffer(&buffer, buffer_length,
641
840
buffer_capacity);
642
841
if(buffer_capacity == 0){
643
perror("adjustbuffer");
644
retval = -1;
842
int e = errno;
843
perror_plus("incbuffer");
844
errno = e;
845
goto mandos_end;
846
}
847
848
if(quit_now){
849
errno = EINTR;
645
850
goto mandos_end;
646
851
}
647
852
656
861
case GNUTLS_E_AGAIN:
657
862
break;
658
863
case GNUTLS_E_REHANDSHAKE:
659
do{
864
do {
660
865
ret = gnutls_handshake(session);
866
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
661
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
662
872
if(ret < 0){
663
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
664
874
gnutls_perror(ret);
665
retval = -1;
875
errno = EPROTO;
666
876
goto mandos_end;
667
877
}
668
878
break;
669
879
default:
670
880
fprintf(stderr, "Unknown error while reading data from"
671
881
" encrypted session with Mandos server\n");
672
retval = -1;
673
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
674
884
goto mandos_end;
675
885
}
676
886
} else {
682
892
fprintf(stderr, "Closing TLS session\n");
683
893
}
684
894
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
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);
686
907
687
908
if(buffer_length > 0){
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
909
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
689
911
buffer_length,
690
912
&decrypted_buffer);
691
913
if(decrypted_buffer_size >= 0){
914
692
915
written = 0;
693
916
while(written < (size_t) decrypted_buffer_size){
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
694
922
ret = (int)fwrite(decrypted_buffer + written, 1,
695
923
(size_t)decrypted_buffer_size - written,
696
924
stdout);
697
925
if(ret == 0 and ferror(stdout)){
926
int e = errno;
698
927
if(debug){
699
928
fprintf(stderr, "Error writing encrypted data: %s\n",
700
929
strerror(errno));
701
930
}
702
retval = -1;
703
break;
931
errno = e;
932
goto mandos_end;
704
933
}
705
934
written += (size_t)ret;
706
935
}
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
936
retval = 0;
710
937
}
711
} else {
712
retval = -1;
713
938
}
714
939
715
940
/* Shutdown procedure */
716
941
717
942
mandos_end:
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
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
}
722
962
}
723
gnutls_deinit(session);
724
963
return retval;
725
964
}
726
965
727
966
static void resolve_callback(AvahiSServiceResolver *r,
728
967
AvahiIfIndex interface,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
968
AvahiProtocol proto,
730
969
AvahiResolverEvent event,
731
970
const char *name,
732
971
const char *type,
737
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
738
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
739
978
flags,
740
void* userdata){
741
mandos_context *mc = userdata;
979
AVAHI_GCC_UNUSED void* userdata){
742
980
assert(r);
743
981
744
982
/* Called whenever a service has been resolved successfully or
745
983
timed out */
746
984
985
if(quit_now){
986
return;
987
}
988
747
989
switch(event){
748
990
default:
749
991
case AVAHI_RESOLVER_FAILURE:
750
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
751
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
752
avahi_strerror(avahi_server_errno(mc->server)));
994
avahi_strerror(avahi_server_errno(mc.server)));
753
995
break;
754
996
755
997
case AVAHI_RESOLVER_FOUND:
761
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
1004
ip, (intmax_t)interface, port);
763
1005
}
764
int ret = start_mandos_communication(ip, port, interface, mc);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
765
1008
if(ret == 0){
766
avahi_simple_poll_quit(mc->simple_poll);
1009
avahi_simple_poll_quit(mc.simple_poll);
1010
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
767
1013
}
768
1014
}
769
1015
}
779
1025
const char *domain,
780
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
781
1027
flags,
782
void* userdata){
783
mandos_context *mc = userdata;
1028
AVAHI_GCC_UNUSED void* userdata){
784
1029
assert(b);
785
1030
786
1031
/* Called whenever a new services becomes available on the LAN or
787
1032
is removed from the LAN */
788
1033
1034
if(quit_now){
1035
return;
1036
}
1037
789
1038
switch(event){
790
1039
default:
791
1040
case AVAHI_BROWSER_FAILURE:
792
1041
793
1042
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
796
1045
return;
797
1046
798
1047
case AVAHI_BROWSER_NEW:
801
1050
the callback function is called the Avahi server will free the
802
1051
resolver for us. */
803
1052
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
808
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
810
1058
break;
811
1059
812
1060
case AVAHI_BROWSER_REMOVE:
821
1069
}
822
1070
}
823
1071
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
824
1274
int main(int argc, char *argv[]){
825
1275
AvahiSServiceBrowser *sb = NULL;
826
1276
int error;
827
1277
int ret;
828
1278
intmax_t tmpmax;
829
int numchars;
1279
char *tmp;
830
1280
int exitcode = EXIT_SUCCESS;
831
const char *interface = "eth0";
1281
const char *interface = "";
832
1282
struct ifreq network;
833
int sd;
1283
int sd = -1;
1284
bool take_down_interface = false;
834
1285
uid_t uid;
835
1286
gid_t gid;
836
char *connect_to = NULL;
837
1287
char tempdir[] = "/tmp/mandosXXXXXX";
838
1288
bool tempdir_created = false;
839
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
840
1290
const char *seckey = PATHDIR "/" SECKEY;
841
1291
const char *pubkey = PATHDIR "/" PUBKEY;
842
1292
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
846
1293
bool gnutls_initialized = false;
847
1294
bool gpgme_initialized = false;
848
double delay = 2.5;
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
}
849
1322
850
1323
{
851
1324
struct argp_option options[] = {
857
1330
.group = 1 },
858
1331
{ .name = "interface", .key = 'i',
859
1332
.arg = "NAME",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1333
.doc = "Network interface that will be used to search for"
1334
" Mandos servers",
862
1335
.group = 1 },
863
1336
{ .name = "seckey", .key = 's',
864
1337
.arg = "FILE",
881
1354
.arg = "SECONDS",
882
1355
.doc = "Maximum delay to wait for interface startup",
883
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 },
884
1370
{ .name = NULL }
885
1371
};
886
1372
887
1373
error_t parse_opt(int key, char *arg,
888
1374
struct argp_state *state){
1375
errno = 0;
889
1376
switch(key){
890
1377
case 128: /* --debug */
891
1378
debug = true;
903
1390
pubkey = arg;
904
1391
break;
905
1392
case 129: /* --dh-bits */
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
910
exit(EXIT_FAILURE);
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");
911
1398
}
912
1399
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
913
1400
break;
915
1402
mc.priority = arg;
916
1403
break;
917
1404
case 131: /* --delay */
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
921
exit(EXIT_FAILURE);
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");
922
1416
}
923
1417
break;
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
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);
927
1431
break;
928
1432
default:
929
1433
return ARGP_ERR_UNKNOWN;
930
1434
}
931
return 0;
1435
return errno;
932
1436
}
933
1437
934
1438
struct argp argp = { .options = options, .parser = parse_opt,
935
1439
.args_doc = "",
936
1440
.doc = "Mandos client -- Get and decrypt"
937
1441
" passwords from a Mandos server" };
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
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
{
1460
/* Work around Debian bug #633582:
1461
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1464
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
1513
}
1514
1515
if(not debug){
1516
avahi_set_log_function(empty_log);
1517
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
941
1539
exitcode = EXIT_FAILURE;
942
1540
goto end;
943
1541
}
944
1542
}
945
1543
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1545
from the signal handler */
1546
/* Initialize the pseudo-RNG for Avahi */
1547
srand((unsigned int) time(NULL));
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1551
exitcode = EX_UNAVAILABLE;
1552
goto end;
1553
}
1554
1555
sigemptyset(&sigterm_action.sa_mask);
1556
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1557
if(ret == -1){
1558
perror_plus("sigaddset");
1559
exitcode = EX_OSERR;
1560
goto end;
1561
}
1562
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1563
if(ret == -1){
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1566
goto end;
1567
}
1568
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1569
if(ret == -1){
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1572
goto end;
1573
}
1574
/* Need to check if the handler is SIG_IGN before handling:
1575
| [[info:libc:Initial Signal Actions]] |
1576
| [[info:libc:Basic Signal Handling]] |
1577
*/
1578
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1579
if(ret == -1){
1580
perror_plus("sigaction");
1581
return EX_OSERR;
1582
}
1583
if(old_sigterm_action.sa_handler != SIG_IGN){
1584
ret = sigaction(SIGINT, &sigterm_action, NULL);
1585
if(ret == -1){
1586
perror_plus("sigaction");
1587
exitcode = EX_OSERR;
1588
goto end;
1589
}
1590
}
1591
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1592
if(ret == -1){
1593
perror_plus("sigaction");
1594
return EX_OSERR;
1595
}
1596
if(old_sigterm_action.sa_handler != SIG_IGN){
1597
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1598
if(ret == -1){
1599
perror_plus("sigaction");
1600
exitcode = EX_OSERR;
1601
goto end;
1602
}
1603
}
1604
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1605
if(ret == -1){
1606
perror_plus("sigaction");
1607
return EX_OSERR;
1608
}
1609
if(old_sigterm_action.sa_handler != SIG_IGN){
1610
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1611
if(ret == -1){
1612
perror_plus("sigaction");
1613
exitcode = EX_OSERR;
1614
goto end;
1615
}
1616
}
1617
946
1618
/* If the interface is down, bring it up */
947
{
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
948
1638
#ifdef __linux__
949
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
1640
messages about the network interface to mess up the prompt */
951
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
952
1643
if(ret == -1){
953
perror("klogctl");
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
954
1646
}
955
#endif
1647
#endif /* __linux__ */
956
1648
957
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
958
1650
if(sd < 0){
959
perror("socket");
960
exitcode = EXIT_FAILURE;
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
961
1653
#ifdef __linux__
962
ret = klogctl(7, NULL, 0);
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
963
1664
if(ret == -1){
964
perror("klogctl");
1665
perror_plus("seteuid");
965
1666
}
966
#endif
967
1667
goto end;
968
1668
}
969
1669
strcpy(network.ifr_name, interface);
970
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
971
1671
if(ret == -1){
972
perror("ioctl SIOCGIFFLAGS");
1672
perror_plus("ioctl SIOCGIFFLAGS");
973
1673
#ifdef __linux__
974
ret = klogctl(7, NULL, 0);
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
975
1685
if(ret == -1){
976
perror("klogctl");
1686
perror_plus("seteuid");
977
1687
}
978
#endif
979
exitcode = EXIT_FAILURE;
980
1688
goto end;
981
1689
}
982
1690
if((network.ifr_flags & IFF_UP) == 0){
983
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
984
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
985
1694
if(ret == -1){
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
988
1698
#ifdef __linux__
989
ret = klogctl(7, NULL, 0);
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
perror_plus("klogctl");
1703
}
1704
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
990
1709
if(ret == -1){
991
perror("klogctl");
1710
perror_plus("seteuid");
992
1711
}
993
#endif
994
1712
goto end;
995
1713
}
996
1714
}
997
/* sleep checking until interface is running */
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
998
1717
for(int i=0; i < delay * 4; i++){
999
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1000
1719
if(ret == -1){
1001
perror("ioctl SIOCGIFFLAGS");
1720
perror_plus("ioctl SIOCGIFFLAGS");
1002
1721
} else if(network.ifr_flags & IFF_RUNNING){
1003
1722
break;
1004
1723
}
1005
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1006
1725
ret = nanosleep(&sleeptime, NULL);
1007
1726
if(ret == -1 and errno != EINTR){
1008
perror("nanosleep");
1727
perror_plus("nanosleep");
1009
1728
}
1010
1729
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1014
1736
}
1015
1737
#ifdef __linux__
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1018
if(ret == -1){
1019
perror("klogctl");
1020
}
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
1754
} else {
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
1761
}
1762
1763
if(quit_now){
1764
goto end;
1765
}
1766
1767
ret = init_gnutls_global(pubkey, seckey);
1038
1768
if(ret == -1){
1039
1769
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
1770
exitcode = EX_UNAVAILABLE;
1041
1771
goto end;
1042
1772
} else {
1043
1773
gnutls_initialized = true;
1044
1774
}
1045
1775
1776
if(quit_now){
1777
goto end;
1778
}
1779
1046
1780
if(mkdtemp(tempdir) == NULL){
1047
perror("mkdtemp");
1781
perror_plus("mkdtemp");
1048
1782
goto end;
1049
1783
}
1050
1784
tempdir_created = true;
1051
1785
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1786
if(quit_now){
1787
goto end;
1788
}
1789
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1053
1791
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
1792
exitcode = EX_UNAVAILABLE;
1055
1793
goto end;
1056
1794
} else {
1057
1795
gpgme_initialized = true;
1058
1796
}
1059
1797
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
1798
if(quit_now){
1064
1799
goto end;
1065
1800
}
1066
1801
1070
1805
char *address = strrchr(connect_to, ':');
1071
1806
if(address == NULL){
1072
1807
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
1808
exitcode = EX_USAGE;
1809
goto end;
1810
}
1811
1812
if(quit_now){
1813
goto end;
1814
}
1815
1076
1816
uint16_t port;
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1817
errno = 0;
1818
tmpmax = strtoimax(address+1, &tmp, 10);
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
or tmpmax != (uint16_t)tmpmax){
1080
1821
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
1822
exitcode = EX_USAGE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1084
1830
port = (uint16_t)tmpmax;
1085
1831
*address = '\0';
1086
1832
address = connect_to;
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1833
/* Colon in address indicates IPv6 */
1834
int af;
1835
if(strchr(address, ':') != NULL){
1836
af = AF_INET6;
1090
1837
} else {
1838
af = AF_INET;
1839
}
1840
1841
if(quit_now){
1842
goto end;
1843
}
1844
1845
while(not quit_now){
1846
ret = start_mandos_communication(address, port, if_index, af);
1847
if(quit_now or ret == 0){
1848
break;
1849
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
1091
1854
exitcode = EXIT_SUCCESS;
1092
1855
}
1856
1093
1857
goto end;
1094
1858
}
1095
1859
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
1860
if(quit_now){
1108
1861
goto end;
1109
1862
}
1110
1863
1130
1883
if(mc.server == NULL){
1131
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1132
1885
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
1886
exitcode = EX_UNAVAILABLE;
1887
goto end;
1888
}
1889
1890
if(quit_now){
1134
1891
goto end;
1135
1892
}
1136
1893
1137
1894
/* Create the Avahi service browser */
1138
1895
sb = avahi_s_service_browser_new(mc.server, if_index,
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1896
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
NULL, 0, browse_callback, NULL);
1141
1898
if(sb == NULL){
1142
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1143
1900
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
1901
exitcode = EX_UNAVAILABLE;
1902
goto end;
1903
}
1904
1905
if(quit_now){
1145
1906
goto end;
1146
1907
}
1147
1908
1150
1911
if(debug){
1151
1912
fprintf(stderr, "Starting Avahi loop search\n");
1152
1913
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
1917
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
1920
}
1155
1921
1156
1922
end:
1157
1923
1178
1944
if(gpgme_initialized){
1179
1945
gpgme_release(mc.ctx);
1180
1946
}
1181
1182
/* Removes the temp directory used by GPGME */
1947
1948
/* Cleans up the circular linked list of Mandos servers the client
1949
has seen */
1950
if(mc.current_server != NULL){
1951
mc.current_server->prev->next = NULL;
1952
while(mc.current_server != NULL){
1953
server *next = mc.current_server->next;
1954
free(mc.current_server);
1955
mc.current_server = next;
1956
}
1957
}
1958
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
1966
}
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1976
}
1977
}
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
1988
}
1989
}
1990
1991
/* Removes the GPGME temp directory and all files inside */
1183
1992
if(tempdir_created){
1184
DIR *d;
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1187
if(d == NULL){
1188
if(errno != ENOENT){
1189
perror("opendir");
1190
}
1191
} else {
1192
while(true){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1195
break;
1196
}
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1202
continue;
1203
}
1993
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1204
1999
char *fullname = NULL;
1205
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
1206
2001
direntry->d_name);
1207
2002
if(ret < 0){
1208
perror("asprintf");
2003
perror_plus("asprintf");
1209
2004
continue;
1210
2005
}
1211
2006
ret = remove(fullname);
1215
2010
}
1216
2011
free(fullname);
1217
2012
}
1218
closedir(d);
2013
}
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2017
free(direntries);
2018
if (ret == -1){
2019
perror_plus("scandir");
1219
2020
}
1220
2021
ret = rmdir(tempdir);
1221
2022
if(ret == -1 and errno != ENOENT){
1222
perror("rmdir");
1223
}
2023
perror_plus("rmdir");
2024
}
2025
}
2026
2027
if(quit_now){
2028
sigemptyset(&old_sigterm_action.sa_mask);
2029
old_sigterm_action.sa_handler = SIG_DFL;
2030
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2031
&old_sigterm_action,
2032
NULL));
2033
if(ret == -1){
2034
perror_plus("sigaction");
2035
}
2036
do {
2037
ret = raise(signal_received);
2038
} while(ret != 0 and errno == EINTR);
2039
if(ret != 0){
2040
perror_plus("raise");
2041
abort();
2042
}
2043
TEMP_FAILURE_RETRY(pause());
1224
2044
}
1225
2045
1226
2046
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0