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- Committer: teddy at bsnet
- Date: 2011-11-11 15:05:27 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111111150527-hdlgk1hkubtbth10
* plugins.d/mandos-client.c (good_interface): Add error message.
(up_interface): Use get_flags() and good_flags(). Also check the
IFF_RUNNING flags.
(runnable_hook): Bug fix: Add NULL to execl() call.
(main): Use network interfaces which are up and running in
preference to any other interfaces.
(up_interface): Use get_flags() and good_flags(). Also check the
IFF_RUNNING flags.
(runnable_hook): Bug fix: Add NULL to execl() call.
(main): Use network interfaces which are up and running in
preference to any other interfaces.
- 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
49
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
53
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
55
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
57
connect() */
58
inet_pton(), connect() */
58
59
#include <fcntl.h> /* open() */
59
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
61
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
62
64
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
69
SIOCSIFFLAGS, if_indextoname(),
67
70
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
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
112
123
#define PATHDIR "/conf/conf.d/mandos"
113
124
#define SECKEY "seckey.txt"
114
125
#define PUBKEY "pubkey.txt"
126
#define HOOKDIR "/lib/mandos/network-hooks.d"
115
127
116
128
bool debug = false;
117
129
static const char mandos_protocol_version[] = "1";
118
130
const char *argp_program_version = "mandos-client " VERSION;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
static const char sys_class_net[] = "/sys/class/net";
133
char *connect_to = NULL;
134
135
/* Doubly linked list that need to be circularly linked when used */
136
typedef struct server{
137
const char *ip;
138
uint16_t port;
139
AvahiIfIndex if_index;
140
int af;
141
struct timespec last_seen;
142
struct server *next;
143
struct server *prev;
144
} server;
120
145
121
146
/* Used for passing in values through the Avahi callback functions */
122
147
typedef struct {
127
152
gnutls_dh_params_t dh_params;
128
153
const char *priority;
129
154
gpgme_ctx_t ctx;
155
server *current_server;
130
156
} mandos_context;
131
157
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
163
164
sig_atomic_t quit_now = 0;
165
int signal_received = 0;
166
167
/* Function to use when printing errors */
168
void perror_plus(const char *print_text){
169
fprintf(stderr, "Mandos plugin %s: ",
170
program_invocation_short_name);
171
perror(print_text);
172
}
173
132
174
/*
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
* bytes. "buffer_capacity" is how much is currently allocated,
135
177
* "buffer_length" is how much is already used.
136
178
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
179
size_t incbuffer(char **buffer, size_t buffer_length,
138
180
size_t buffer_capacity){
139
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
146
188
return buffer_capacity;
147
189
}
148
190
191
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
195
int ret;
196
server *new_server = malloc(sizeof(server));
197
if(new_server == NULL){
198
perror_plus("malloc");
199
return -1;
200
}
201
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
205
if(new_server->ip == NULL){
206
perror_plus("strdup");
207
return -1;
208
}
209
/* Special case of first server */
210
if (mc.current_server == NULL){
211
new_server->next = new_server;
212
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
215
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
218
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
227
}
228
149
229
/*
150
230
* Initialize GPGME.
151
231
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
232
static bool init_gpgme(const char *seckey,
153
233
const char *pubkey, const char *tempdir){
154
int ret;
155
234
gpgme_error_t rc;
156
235
gpgme_engine_info_t engine_info;
157
236
160
239
* Helper function to insert pub and seckey to the engine keyring.
161
240
*/
162
241
bool import_key(const char *filename){
242
int ret;
163
243
int fd;
164
244
gpgme_data_t pgp_data;
165
245
166
246
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
167
247
if(fd == -1){
168
perror("open");
248
perror_plus("open");
169
249
return false;
170
250
}
171
251
176
256
return false;
177
257
}
178
258
179
rc = gpgme_op_import(mc->ctx, pgp_data);
259
rc = gpgme_op_import(mc.ctx, pgp_data);
180
260
if(rc != GPG_ERR_NO_ERROR){
181
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
262
gpgme_strsource(rc), gpgme_strerror(rc));
185
265
186
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
187
267
if(ret == -1){
188
perror("close");
268
perror_plus("close");
189
269
}
190
270
gpgme_data_release(pgp_data);
191
271
return true;
192
272
}
193
273
194
274
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
275
fprintf(stderr, "Initializing GPGME\n");
196
276
}
197
277
198
278
/* Init GPGME */
204
284
return false;
205
285
}
206
286
207
/* Set GPGME home directory for the OpenPGP engine only */
287
/* Set GPGME home directory for the OpenPGP engine only */
208
288
rc = gpgme_get_engine_info(&engine_info);
209
289
if(rc != GPG_ERR_NO_ERROR){
210
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
225
305
}
226
306
227
307
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
308
rc = gpgme_new(&(mc.ctx));
229
309
if(rc != GPG_ERR_NO_ERROR){
230
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
311
gpgme_strsource(rc), gpgme_strerror(rc));
236
316
return false;
237
317
}
238
318
239
return true;
319
return true;
240
320
}
241
321
242
322
/*
243
323
* Decrypt OpenPGP data.
244
324
* Returns -1 on error
245
325
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
326
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
327
size_t crypto_size,
249
328
char **plaintext){
250
329
gpgme_data_t dh_crypto, dh_plain;
277
356
278
357
/* Decrypt data from the cryptotext data buffer to the plaintext
279
358
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
360
if(rc != GPG_ERR_NO_ERROR){
282
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
362
gpgme_strsource(rc), gpgme_strerror(rc));
284
363
plaintext_length = -1;
285
364
if(debug){
286
365
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
366
result = gpgme_op_decrypt_result(mc.ctx);
288
367
if(result == NULL){
289
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
290
369
} else {
297
376
}
298
377
gpgme_recipient_t recipient;
299
378
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
}
379
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
386
recipient = recipient->next;
310
387
}
311
388
}
312
389
}
319
396
320
397
/* Seek back to the beginning of the GPGME plaintext data buffer */
321
398
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
322
perror("gpgme_data_seek");
399
perror_plus("gpgme_data_seek");
323
400
plaintext_length = -1;
324
401
goto decrypt_end;
325
402
}
326
403
327
404
*plaintext = NULL;
328
405
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
406
plaintext_capacity = incbuffer(plaintext,
330
407
(size_t)plaintext_length,
331
408
plaintext_capacity);
332
409
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
410
perror_plus("incbuffer");
334
411
plaintext_length = -1;
335
412
goto decrypt_end;
336
413
}
343
420
break;
344
421
}
345
422
if(ret < 0){
346
perror("gpgme_data_read");
423
perror_plus("gpgme_data_read");
347
424
plaintext_length = -1;
348
425
goto decrypt_end;
349
426
}
382
459
fprintf(stderr, "GnuTLS: %s", string);
383
460
}
384
461
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
462
static int init_gnutls_global(const char *pubkeyfilename,
387
463
const char *seckeyfilename){
388
464
int ret;
389
465
407
483
}
408
484
409
485
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
411
487
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
488
fprintf(stderr, "GnuTLS memory error: %s\n",
416
489
safer_gnutls_strerror(ret));
417
490
gnutls_global_deinit();
418
491
return -1;
425
498
}
426
499
427
500
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
501
(mc.cred, pubkeyfilename, seckeyfilename,
429
502
GNUTLS_OPENPGP_FMT_BASE64);
430
503
if(ret != GNUTLS_E_SUCCESS){
431
504
fprintf(stderr,
437
510
}
438
511
439
512
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
513
ret = gnutls_dh_params_init(&mc.dh_params);
441
514
if(ret != GNUTLS_E_SUCCESS){
442
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
516
" %s\n", safer_gnutls_strerror(ret));
444
517
goto globalfail;
445
518
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
520
if(ret != GNUTLS_E_SUCCESS){
448
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
522
safer_gnutls_strerror(ret));
450
523
goto globalfail;
451
524
}
452
525
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
527
455
528
return 0;
456
529
457
530
globalfail:
458
531
459
gnutls_certificate_free_credentials(mc->cred);
532
gnutls_certificate_free_credentials(mc.cred);
460
533
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
534
gnutls_dh_params_deinit(mc.dh_params);
462
535
return -1;
463
536
}
464
537
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
538
static int init_gnutls_session(gnutls_session_t *session){
467
539
int ret;
468
540
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
541
do {
542
ret = gnutls_init(session, GNUTLS_SERVER);
543
if(quit_now){
544
return -1;
545
}
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
547
if(ret != GNUTLS_E_SUCCESS){
471
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
549
safer_gnutls_strerror(ret));
474
551
475
552
{
476
553
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
556
if(quit_now){
557
gnutls_deinit(*session);
558
return -1;
559
}
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
561
if(ret != GNUTLS_E_SUCCESS){
479
562
fprintf(stderr, "Syntax error at: %s\n", err);
480
563
fprintf(stderr, "GnuTLS error: %s\n",
484
567
}
485
568
}
486
569
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
570
do {
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
573
if(quit_now){
574
gnutls_deinit(*session);
575
return -1;
576
}
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
489
578
if(ret != GNUTLS_E_SUCCESS){
490
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
580
safer_gnutls_strerror(ret));
494
583
}
495
584
496
585
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
587
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
589
502
590
return 0;
503
591
}
509
597
/* Called when a Mandos server is found */
510
598
static int start_mandos_communication(const char *ip, uint16_t port,
511
599
AvahiIfIndex if_index,
512
mandos_context *mc){
513
int ret, tcp_sd;
600
int af){
601
int ret, tcp_sd = -1;
514
602
ssize_t sret;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
516
607
char *buffer = NULL;
517
char *decrypted_buffer;
608
char *decrypted_buffer = NULL;
518
609
size_t buffer_length = 0;
519
610
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
521
611
size_t written;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
612
int retval = -1;
524
613
gnutls_session_t session;
525
526
ret = init_gnutls_session(mc, &session);
614
int pf; /* Protocol family */
615
616
errno = 0;
617
618
if(quit_now){
619
errno = EINTR;
620
return -1;
621
}
622
623
switch(af){
624
case AF_INET6:
625
pf = PF_INET6;
626
break;
627
case AF_INET:
628
pf = PF_INET;
629
break;
630
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
632
errno = EINVAL;
633
return -1;
634
}
635
636
ret = init_gnutls_session(&session);
527
637
if(ret != 0){
528
638
return -1;
529
639
}
530
640
531
641
if(debug){
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
533
643
"\n", ip, port);
534
644
}
535
645
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
537
647
if(tcp_sd < 0){
538
perror("socket");
539
return -1;
648
int e = errno;
649
perror_plus("socket");
650
errno = e;
651
goto mandos_end;
540
652
}
541
653
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);
654
if(quit_now){
655
errno = EINTR;
656
goto mandos_end;
548
657
}
549
658
550
659
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);
660
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
663
} else { /* IPv4 */
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
666
}
555
667
if(ret < 0 ){
556
perror("inet_pton");
557
return -1;
668
int e = errno;
669
perror_plus("inet_pton");
670
errno = e;
671
goto mandos_end;
558
672
}
559
673
if(ret == 0){
674
int e = errno;
560
675
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
676
errno = e;
677
goto mandos_end;
562
678
}
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
if(af == AF_INET6){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
687
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
690
errno = EINVAL;
691
goto mandos_end;
692
}
693
/* Set the network interface number as scope */
694
to.in6.sin6_scope_id = (uint32_t)if_index;
695
}
696
} else {
697
to.in.sin_port = htons(port); /* Spurious warnings from
564
698
-Wconversion and
565
699
-Wunreachable-code */
700
}
566
701
567
to.in6.sin6_scope_id = (uint32_t)if_index;
702
if(quit_now){
703
errno = EINTR;
704
goto mandos_end;
705
}
568
706
569
707
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");
708
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
709
char interface[IF_NAMESIZE];
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
perror_plus("if_indextoname");
712
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
715
}
716
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
719
}
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
576
732
} else {
577
733
if(strcmp(addrstr, ip) != 0){
578
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
580
736
}
581
737
}
582
738
583
ret = connect(tcp_sd, &to.in, sizeof(to));
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
584
749
if(ret < 0){
585
perror("connect");
586
return -1;
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
587
761
}
588
762
589
763
const char *out = mandos_protocol_version;
593
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
594
768
out_size - written));
595
769
if(ret == -1){
596
perror("write");
597
retval = -1;
770
int e = errno;
771
perror_plus("write");
772
errno = e;
598
773
goto mandos_end;
599
774
}
600
775
written += (size_t)ret;
608
783
break;
609
784
}
610
785
}
786
787
if(quit_now){
788
errno = EINTR;
789
goto mandos_end;
790
}
611
791
}
612
792
613
793
if(debug){
614
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
795
}
616
796
797
if(quit_now){
798
errno = EINTR;
799
goto mandos_end;
800
}
801
802
/* Spurious warning from -Wint-to-pointer-cast */
617
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
618
804
619
do{
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
810
do {
620
811
ret = gnutls_handshake(session);
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
621
816
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
622
817
623
818
if(ret != GNUTLS_E_SUCCESS){
625
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
626
821
gnutls_perror(ret);
627
822
}
628
retval = -1;
823
errno = EPROTO;
629
824
goto mandos_end;
630
825
}
631
826
632
827
/* Read OpenPGP packet that contains the wanted password */
633
828
634
829
if(debug){
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
636
831
ip);
637
832
}
638
833
639
834
while(true){
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
841
buffer_capacity = incbuffer(&buffer, buffer_length,
641
842
buffer_capacity);
642
843
if(buffer_capacity == 0){
643
perror("adjustbuffer");
644
retval = -1;
844
int e = errno;
845
perror_plus("incbuffer");
846
errno = e;
847
goto mandos_end;
848
}
849
850
if(quit_now){
851
errno = EINTR;
645
852
goto mandos_end;
646
853
}
647
854
656
863
case GNUTLS_E_AGAIN:
657
864
break;
658
865
case GNUTLS_E_REHANDSHAKE:
659
do{
866
do {
660
867
ret = gnutls_handshake(session);
868
869
if(quit_now){
870
errno = EINTR;
871
goto mandos_end;
872
}
661
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
662
874
if(ret < 0){
663
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
664
876
gnutls_perror(ret);
665
retval = -1;
877
errno = EPROTO;
666
878
goto mandos_end;
667
879
}
668
880
break;
669
881
default:
670
882
fprintf(stderr, "Unknown error while reading data from"
671
883
" encrypted session with Mandos server\n");
672
retval = -1;
673
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
errno = EIO;
674
886
goto mandos_end;
675
887
}
676
888
} else {
682
894
fprintf(stderr, "Closing TLS session\n");
683
895
}
684
896
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
897
if(quit_now){
898
errno = EINTR;
899
goto mandos_end;
900
}
901
902
do {
903
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
if(quit_now){
905
errno = EINTR;
906
goto mandos_end;
907
}
908
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
686
909
687
910
if(buffer_length > 0){
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
911
ssize_t decrypted_buffer_size;
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
689
913
buffer_length,
690
914
&decrypted_buffer);
691
915
if(decrypted_buffer_size >= 0){
916
692
917
written = 0;
693
918
while(written < (size_t) decrypted_buffer_size){
919
if(quit_now){
920
errno = EINTR;
921
goto mandos_end;
922
}
923
694
924
ret = (int)fwrite(decrypted_buffer + written, 1,
695
925
(size_t)decrypted_buffer_size - written,
696
926
stdout);
697
927
if(ret == 0 and ferror(stdout)){
928
int e = errno;
698
929
if(debug){
699
930
fprintf(stderr, "Error writing encrypted data: %s\n",
700
931
strerror(errno));
701
932
}
702
retval = -1;
703
break;
933
errno = e;
934
goto mandos_end;
704
935
}
705
936
written += (size_t)ret;
706
937
}
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
938
retval = 0;
710
939
}
711
} else {
712
retval = -1;
713
940
}
714
941
715
942
/* Shutdown procedure */
716
943
717
944
mandos_end:
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
945
{
946
int e = errno;
947
free(decrypted_buffer);
948
free(buffer);
949
if(tcp_sd >= 0){
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
951
}
952
if(ret == -1){
953
if(e == 0){
954
e = errno;
955
}
956
perror_plus("close");
957
}
958
gnutls_deinit(session);
959
errno = e;
960
if(quit_now){
961
errno = EINTR;
962
retval = -1;
963
}
722
964
}
723
gnutls_deinit(session);
724
965
return retval;
725
966
}
726
967
727
968
static void resolve_callback(AvahiSServiceResolver *r,
728
969
AvahiIfIndex interface,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
970
AvahiProtocol proto,
730
971
AvahiResolverEvent event,
731
972
const char *name,
732
973
const char *type,
737
978
AVAHI_GCC_UNUSED AvahiStringList *txt,
738
979
AVAHI_GCC_UNUSED AvahiLookupResultFlags
739
980
flags,
740
void* userdata){
741
mandos_context *mc = userdata;
981
AVAHI_GCC_UNUSED void* userdata){
742
982
assert(r);
743
983
744
984
/* Called whenever a service has been resolved successfully or
745
985
timed out */
746
986
987
if(quit_now){
988
return;
989
}
990
747
991
switch(event){
748
992
default:
749
993
case AVAHI_RESOLVER_FAILURE:
750
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
751
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
752
avahi_strerror(avahi_server_errno(mc->server)));
996
avahi_strerror(avahi_server_errno(mc.server)));
753
997
break;
754
998
755
999
case AVAHI_RESOLVER_FOUND:
761
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
1006
ip, (intmax_t)interface, port);
763
1007
}
764
int ret = start_mandos_communication(ip, port, interface, mc);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
765
1010
if(ret == 0){
766
avahi_simple_poll_quit(mc->simple_poll);
1011
avahi_simple_poll_quit(mc.simple_poll);
1012
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
767
1015
}
768
1016
}
769
1017
}
779
1027
const char *domain,
780
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
781
1029
flags,
782
void* userdata){
783
mandos_context *mc = userdata;
1030
AVAHI_GCC_UNUSED void* userdata){
784
1031
assert(b);
785
1032
786
1033
/* Called whenever a new services becomes available on the LAN or
787
1034
is removed from the LAN */
788
1035
1036
if(quit_now){
1037
return;
1038
}
1039
789
1040
switch(event){
790
1041
default:
791
1042
case AVAHI_BROWSER_FAILURE:
792
1043
793
1044
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
796
1047
return;
797
1048
798
1049
case AVAHI_BROWSER_NEW:
801
1052
the callback function is called the Avahi server will free the
802
1053
resolver for us. */
803
1054
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
808
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
810
1060
break;
811
1061
812
1062
case AVAHI_BROWSER_REMOVE:
821
1071
}
822
1072
}
823
1073
1074
/* Signal handler that stops main loop after SIGTERM */
1075
static void handle_sigterm(int sig){
1076
if(quit_now){
1077
return;
1078
}
1079
quit_now = 1;
1080
signal_received = sig;
1081
int old_errno = errno;
1082
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1085
}
1086
errno = old_errno;
1087
}
1088
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
int ret;
1091
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
if(s < 0){
1094
perror_plus("socket");
1095
return false;
1096
}
1097
strcpy(ifr->ifr_name, ifname);
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
if(ret == -1){
1100
if(debug){
1101
perror_plus("ioctl SIOCGIFFLAGS");
1102
}
1103
return false;
1104
}
1105
return true;
1106
}
1107
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1110
/* Reject the loopback device */
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1115
}
1116
return false;
1117
}
1118
/* Accept point-to-point devices only if connect_to is specified */
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1123
}
1124
return true;
1125
}
1126
/* Otherwise, reject non-broadcast-capable devices */
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1131
}
1132
return false;
1133
}
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
if(ifr->ifr_flags & IFF_NOARP){
1136
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1138
}
1139
return false;
1140
}
1141
1142
/* Accept this device */
1143
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1145
}
1146
return true;
1147
}
1148
1149
/*
1150
* This function determines if a directory entry in /sys/class/net
1151
* corresponds to an acceptable network device.
1152
* (This function is passed to scandir(3) as a filter function.)
1153
*/
1154
int good_interface(const struct dirent *if_entry){
1155
if(if_entry->d_name[0] == '.'){
1156
return 0;
1157
}
1158
1159
struct ifreq ifr;
1160
if(not get_flags(if_entry->d_name, &ifr)){
1161
if(debug){
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
int notdotentries(const struct dirent *direntry){
1218
/* Skip "." and ".." */
1219
if(direntry->d_name[0] == '.'
1220
and (direntry->d_name[1] == '\0'
1221
or (direntry->d_name[1] == '.'
1222
and direntry->d_name[2] == '\0'))){
1223
return 0;
1224
}
1225
return 1;
1226
}
1227
1228
/* Is this directory entry a runnable program? */
1229
int runnable_hook(const struct dirent *direntry){
1230
int ret;
1231
struct stat st;
1232
1233
if((direntry->d_name)[0] == '\0'){
1234
/* Empty name? */
1235
return 0;
1236
}
1237
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1255
if(ret == -1){
1256
if(debug){
1257
perror_plus("Could not stat plugin");
1258
}
1259
return 0;
1260
}
1261
if(not (S_ISREG(st.st_mode))){
1262
/* Not a regular file */
1263
return 0;
1264
}
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1266
/* Not executable */
1267
return 0;
1268
}
1269
return 1;
1270
}
1271
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1273
int ret;
1274
struct timespec now;
1275
struct timespec waited_time;
1276
intmax_t block_time;
1277
1278
while(true){
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1283
}
1284
ret = avahi_simple_poll_iterate(s, -1);
1285
} else {
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1289
}
1290
/* the current time */
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1292
if(ret == -1){
1293
perror_plus("clock_gettime");
1294
return -1;
1295
}
1296
/* Calculating in ms how long time between now and server
1297
who we visted longest time ago. Now - last seen. */
1298
waited_time.tv_sec = (now.tv_sec
1299
- mc.current_server->last_seen.tv_sec);
1300
waited_time.tv_nsec = (now.tv_nsec
1301
- mc.current_server->last_seen.tv_nsec);
1302
/* total time is 10s/10,000ms.
1303
Converting to s from ms by dividing by 1,000,
1304
and ns to ms by dividing by 1,000,000. */
1305
block_time = ((retry_interval
1306
- ((intmax_t)waited_time.tv_sec * 1000))
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1308
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1311
}
1312
1313
if(block_time <= 0){
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1318
if(ret == 0){
1319
avahi_simple_poll_quit(mc.simple_poll);
1320
return 0;
1321
}
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1323
&mc.current_server->last_seen);
1324
if(ret == -1){
1325
perror_plus("clock_gettime");
1326
return -1;
1327
}
1328
mc.current_server = mc.current_server->next;
1329
block_time = 0; /* Call avahi to find new Mandos
1330
servers, but don't block */
1331
}
1332
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1334
}
1335
if(ret != 0){
1336
if (ret > 0 or errno != EINTR) {
1337
return (ret != 1) ? ret : 0;
1338
}
1339
}
1340
}
1341
}
1342
824
1343
int main(int argc, char *argv[]){
825
1344
AvahiSServiceBrowser *sb = NULL;
826
1345
int error;
827
1346
int ret;
828
1347
intmax_t tmpmax;
829
int numchars;
1348
char *tmp;
830
1349
int exitcode = EXIT_SUCCESS;
831
const char *interface = "eth0";
1350
const char *interface = "";
832
1351
struct ifreq network;
833
int sd;
1352
int sd = -1;
1353
bool take_down_interface = false;
834
1354
uid_t uid;
835
1355
gid_t gid;
836
char *connect_to = NULL;
837
1356
char tempdir[] = "/tmp/mandosXXXXXX";
838
1357
bool tempdir_created = false;
839
1358
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
840
1359
const char *seckey = PATHDIR "/" SECKEY;
841
1360
const char *pubkey = PATHDIR "/" PUBKEY;
842
1361
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
846
1362
bool gnutls_initialized = false;
847
1363
bool gpgme_initialized = false;
848
double delay = 2.5;
1364
float delay = 2.5f;
1365
double retry_interval = 10; /* 10s between trying a server and
1366
retrying the same server again */
1367
1368
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1369
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1370
1371
uid = getuid();
1372
gid = getgid();
1373
1374
/* Lower any group privileges we might have, just to be safe */
1375
errno = 0;
1376
ret = setgid(gid);
1377
if(ret == -1){
1378
perror_plus("setgid");
1379
}
1380
1381
/* Lower user privileges (temporarily) */
1382
errno = 0;
1383
ret = seteuid(uid);
1384
if(ret == -1){
1385
perror_plus("seteuid");
1386
}
1387
1388
if(quit_now){
1389
goto end;
1390
}
849
1391
850
1392
{
851
1393
struct argp_option options[] = {
857
1399
.group = 1 },
858
1400
{ .name = "interface", .key = 'i',
859
1401
.arg = "NAME",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1402
.doc = "Network interface that will be used to search for"
1403
" Mandos servers",
862
1404
.group = 1 },
863
1405
{ .name = "seckey", .key = 's',
864
1406
.arg = "FILE",
881
1423
.arg = "SECONDS",
882
1424
.doc = "Maximum delay to wait for interface startup",
883
1425
.group = 2 },
1426
{ .name = "retry", .key = 132,
1427
.arg = "SECONDS",
1428
.doc = "Retry interval used when denied by the mandos server",
1429
.group = 2 },
1430
/*
1431
* These reproduce what we would get without ARGP_NO_HELP
1432
*/
1433
{ .name = "help", .key = '?',
1434
.doc = "Give this help list", .group = -1 },
1435
{ .name = "usage", .key = -3,
1436
.doc = "Give a short usage message", .group = -1 },
1437
{ .name = "version", .key = 'V',
1438
.doc = "Print program version", .group = -1 },
884
1439
{ .name = NULL }
885
1440
};
886
1441
887
1442
error_t parse_opt(int key, char *arg,
888
1443
struct argp_state *state){
1444
errno = 0;
889
1445
switch(key){
890
1446
case 128: /* --debug */
891
1447
debug = true;
903
1459
pubkey = arg;
904
1460
break;
905
1461
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);
1462
errno = 0;
1463
tmpmax = strtoimax(arg, &tmp, 10);
1464
if(errno != 0 or tmp == arg or *tmp != '\0'
1465
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1466
argp_error(state, "Bad number of DH bits");
911
1467
}
912
1468
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
913
1469
break;
915
1471
mc.priority = arg;
916
1472
break;
917
1473
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);
1474
errno = 0;
1475
delay = strtof(arg, &tmp);
1476
if(errno != 0 or tmp == arg or *tmp != '\0'){
1477
argp_error(state, "Bad delay");
1478
}
1479
case 132: /* --retry */
1480
errno = 0;
1481
retry_interval = strtod(arg, &tmp);
1482
if(errno != 0 or tmp == arg or *tmp != '\0'
1483
or (retry_interval * 1000) > INT_MAX
1484
or retry_interval < 0){
1485
argp_error(state, "Bad retry interval");
922
1486
}
923
1487
break;
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
1488
/*
1489
* These reproduce what we would get without ARGP_NO_HELP
1490
*/
1491
case '?': /* --help */
1492
argp_state_help(state, state->out_stream,
1493
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1494
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1495
case -3: /* --usage */
1496
argp_state_help(state, state->out_stream,
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1498
case 'V': /* --version */
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
1500
exit(argp_err_exit_status);
927
1501
break;
928
1502
default:
929
1503
return ARGP_ERR_UNKNOWN;
930
1504
}
931
return 0;
1505
return errno;
932
1506
}
933
1507
934
1508
struct argp argp = { .options = options, .parser = parse_opt,
935
1509
.args_doc = "",
936
1510
.doc = "Mandos client -- Get and decrypt"
937
1511
" 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");
1512
ret = argp_parse(&argp, argc, argv,
1513
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1514
switch(ret){
1515
case 0:
1516
break;
1517
case ENOMEM:
1518
default:
1519
errno = ret;
1520
perror_plus("argp_parse");
1521
exitcode = EX_OSERR;
1522
goto end;
1523
case EINVAL:
1524
exitcode = EX_USAGE;
1525
goto end;
1526
}
1527
}
1528
1529
{
1530
/* Work around Debian bug #633582:
1531
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
setenv("DEVICE", interface, 1);
1612
setenv("VERBOSE", debug ? "1" : "0", 1);
1613
setenv("MODE", "start", 1);
1614
/* setenv( XXX more here */
1615
ret = execl(fullname, direntry->d_name, "start", NULL);
1616
perror_plus("execl");
1617
}
1618
free(fullname);
1619
if(quit_now){
1620
goto end;
1621
}
1622
}
1623
close(devnull);
1624
}
1625
1626
if(not debug){
1627
avahi_set_log_function(empty_log);
1628
}
1629
1630
if(interface[0] == '\0'){
1631
struct dirent **direntries;
1632
/* First look for interfaces that are up */
1633
ret = scandir(sys_class_net, &direntries, up_interface,
1634
alphasort);
1635
if(ret == 0){
1636
/* No up interfaces, look for any good interfaces */
1637
free(direntries);
1638
ret = scandir(sys_class_net, &direntries, good_interface,
1639
alphasort);
1640
}
1641
if(ret >= 1){
1642
/* Pick the first interface returned */
1643
interface = strdup(direntries[0]->d_name);
1644
if(debug){
1645
fprintf(stderr, "Using interface \"%s\"\n", interface);
1646
}
1647
if(interface == NULL){
1648
perror_plus("malloc");
1649
free(direntries);
1650
exitcode = EXIT_FAILURE;
1651
goto end;
1652
}
1653
free(direntries);
1654
} else {
1655
free(direntries);
1656
fprintf(stderr, "Could not find a network interface\n");
941
1657
exitcode = EXIT_FAILURE;
942
1658
goto end;
943
1659
}
944
1660
}
945
1661
1662
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1663
from the signal handler */
1664
/* Initialize the pseudo-RNG for Avahi */
1665
srand((unsigned int) time(NULL));
1666
mc.simple_poll = avahi_simple_poll_new();
1667
if(mc.simple_poll == NULL){
1668
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1669
exitcode = EX_UNAVAILABLE;
1670
goto end;
1671
}
1672
1673
sigemptyset(&sigterm_action.sa_mask);
1674
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1675
if(ret == -1){
1676
perror_plus("sigaddset");
1677
exitcode = EX_OSERR;
1678
goto end;
1679
}
1680
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1681
if(ret == -1){
1682
perror_plus("sigaddset");
1683
exitcode = EX_OSERR;
1684
goto end;
1685
}
1686
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1687
if(ret == -1){
1688
perror_plus("sigaddset");
1689
exitcode = EX_OSERR;
1690
goto end;
1691
}
1692
/* Need to check if the handler is SIG_IGN before handling:
1693
| [[info:libc:Initial Signal Actions]] |
1694
| [[info:libc:Basic Signal Handling]] |
1695
*/
1696
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1697
if(ret == -1){
1698
perror_plus("sigaction");
1699
return EX_OSERR;
1700
}
1701
if(old_sigterm_action.sa_handler != SIG_IGN){
1702
ret = sigaction(SIGINT, &sigterm_action, NULL);
1703
if(ret == -1){
1704
perror_plus("sigaction");
1705
exitcode = EX_OSERR;
1706
goto end;
1707
}
1708
}
1709
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1710
if(ret == -1){
1711
perror_plus("sigaction");
1712
return EX_OSERR;
1713
}
1714
if(old_sigterm_action.sa_handler != SIG_IGN){
1715
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1716
if(ret == -1){
1717
perror_plus("sigaction");
1718
exitcode = EX_OSERR;
1719
goto end;
1720
}
1721
}
1722
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1723
if(ret == -1){
1724
perror_plus("sigaction");
1725
return EX_OSERR;
1726
}
1727
if(old_sigterm_action.sa_handler != SIG_IGN){
1728
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1729
if(ret == -1){
1730
perror_plus("sigaction");
1731
exitcode = EX_OSERR;
1732
goto end;
1733
}
1734
}
1735
946
1736
/* If the interface is down, bring it up */
947
{
1737
if(strcmp(interface, "none") != 0){
1738
if_index = (AvahiIfIndex) if_nametoindex(interface);
1739
if(if_index == 0){
1740
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1741
exitcode = EX_UNAVAILABLE;
1742
goto end;
1743
}
1744
1745
if(quit_now){
1746
goto end;
1747
}
1748
1749
/* Re-raise priviliges */
1750
errno = 0;
1751
ret = seteuid(0);
1752
if(ret == -1){
1753
perror_plus("seteuid");
1754
}
1755
948
1756
#ifdef __linux__
949
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
1758
messages about the network interface to mess up the prompt */
951
1759
ret = klogctl(8, NULL, 5);
1760
bool restore_loglevel = true;
952
1761
if(ret == -1){
953
perror("klogctl");
1762
restore_loglevel = false;
1763
perror_plus("klogctl");
954
1764
}
955
#endif
1765
#endif /* __linux__ */
956
1766
957
1767
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
958
1768
if(sd < 0){
959
perror("socket");
960
exitcode = EXIT_FAILURE;
1769
perror_plus("socket");
1770
exitcode = EX_OSERR;
961
1771
#ifdef __linux__
962
ret = klogctl(7, NULL, 0);
1772
if(restore_loglevel){
1773
ret = klogctl(7, NULL, 0);
1774
if(ret == -1){
1775
perror_plus("klogctl");
1776
}
1777
}
1778
#endif /* __linux__ */
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
963
1782
if(ret == -1){
964
perror("klogctl");
1783
perror_plus("seteuid");
965
1784
}
966
#endif
967
1785
goto end;
968
1786
}
969
1787
strcpy(network.ifr_name, interface);
970
1788
ret = ioctl(sd, SIOCGIFFLAGS, &network);
971
1789
if(ret == -1){
972
perror("ioctl SIOCGIFFLAGS");
1790
perror_plus("ioctl SIOCGIFFLAGS");
973
1791
#ifdef __linux__
974
ret = klogctl(7, NULL, 0);
1792
if(restore_loglevel){
1793
ret = klogctl(7, NULL, 0);
1794
if(ret == -1){
1795
perror_plus("klogctl");
1796
}
1797
}
1798
#endif /* __linux__ */
1799
exitcode = EX_OSERR;
1800
/* Lower privileges */
1801
errno = 0;
1802
ret = seteuid(uid);
975
1803
if(ret == -1){
976
perror("klogctl");
1804
perror_plus("seteuid");
977
1805
}
978
#endif
979
exitcode = EXIT_FAILURE;
980
1806
goto end;
981
1807
}
982
1808
if((network.ifr_flags & IFF_UP) == 0){
983
1809
network.ifr_flags |= IFF_UP;
1810
take_down_interface = true;
984
1811
ret = ioctl(sd, SIOCSIFFLAGS, &network);
985
1812
if(ret == -1){
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1813
take_down_interface = false;
1814
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1815
exitcode = EX_OSERR;
988
1816
#ifdef __linux__
989
ret = klogctl(7, NULL, 0);
1817
if(restore_loglevel){
1818
ret = klogctl(7, NULL, 0);
1819
if(ret == -1){
1820
perror_plus("klogctl");
1821
}
1822
}
1823
#endif /* __linux__ */
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
990
1827
if(ret == -1){
991
perror("klogctl");
1828
perror_plus("seteuid");
992
1829
}
993
#endif
994
1830
goto end;
995
1831
}
996
1832
}
997
/* sleep checking until interface is running */
1833
/* Sleep checking until interface is running.
1834
Check every 0.25s, up to total time of delay */
998
1835
for(int i=0; i < delay * 4; i++){
999
1836
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1000
1837
if(ret == -1){
1001
perror("ioctl SIOCGIFFLAGS");
1838
perror_plus("ioctl SIOCGIFFLAGS");
1002
1839
} else if(network.ifr_flags & IFF_RUNNING){
1003
1840
break;
1004
1841
}
1005
1842
struct timespec sleeptime = { .tv_nsec = 250000000 };
1006
1843
ret = nanosleep(&sleeptime, NULL);
1007
1844
if(ret == -1 and errno != EINTR){
1008
perror("nanosleep");
1845
perror_plus("nanosleep");
1009
1846
}
1010
1847
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1848
if(not take_down_interface){
1849
/* We won't need the socket anymore */
1850
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1851
if(ret == -1){
1852
perror_plus("close");
1853
}
1014
1854
}
1015
1855
#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);
1856
if(restore_loglevel){
1857
/* Restores kernel loglevel to default */
1858
ret = klogctl(7, NULL, 0);
1859
if(ret == -1){
1860
perror_plus("klogctl");
1861
}
1862
}
1863
#endif /* __linux__ */
1864
/* Lower privileges */
1865
errno = 0;
1866
if(take_down_interface){
1867
/* Lower privileges */
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
1872
} else {
1873
/* Lower privileges permanently */
1874
ret = setuid(uid);
1875
if(ret == -1){
1876
perror_plus("setuid");
1877
}
1878
}
1879
}
1880
1881
if(quit_now){
1882
goto end;
1883
}
1884
1885
ret = init_gnutls_global(pubkey, seckey);
1038
1886
if(ret == -1){
1039
1887
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
1888
exitcode = EX_UNAVAILABLE;
1041
1889
goto end;
1042
1890
} else {
1043
1891
gnutls_initialized = true;
1044
1892
}
1045
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1046
1898
if(mkdtemp(tempdir) == NULL){
1047
perror("mkdtemp");
1899
perror_plus("mkdtemp");
1048
1900
goto end;
1049
1901
}
1050
1902
tempdir_created = true;
1051
1903
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1904
if(quit_now){
1905
goto end;
1906
}
1907
1908
if(not init_gpgme(pubkey, seckey, tempdir)){
1053
1909
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
1910
exitcode = EX_UNAVAILABLE;
1055
1911
goto end;
1056
1912
} else {
1057
1913
gpgme_initialized = true;
1058
1914
}
1059
1915
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;
1916
if(quit_now){
1064
1917
goto end;
1065
1918
}
1066
1919
1070
1923
char *address = strrchr(connect_to, ':');
1071
1924
if(address == NULL){
1072
1925
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
1926
exitcode = EX_USAGE;
1927
goto end;
1928
}
1929
1930
if(quit_now){
1931
goto end;
1932
}
1933
1076
1934
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'){
1935
errno = 0;
1936
tmpmax = strtoimax(address+1, &tmp, 10);
1937
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1938
or tmpmax != (uint16_t)tmpmax){
1080
1939
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
1940
exitcode = EX_USAGE;
1941
goto end;
1942
}
1943
1944
if(quit_now){
1945
goto end;
1946
}
1947
1084
1948
port = (uint16_t)tmpmax;
1085
1949
*address = '\0';
1950
/* Colon in address indicates IPv6 */
1951
int af;
1952
if(strchr(connect_to, ':') != NULL){
1953
af = AF_INET6;
1954
/* Accept [] around IPv6 address - see RFC 5952 */
1955
if(connect_to[0] == '[' and address[-1] == ']')
1956
{
1957
connect_to++;
1958
address[-1] = '\0';
1959
}
1960
} else {
1961
af = AF_INET;
1962
}
1086
1963
address = connect_to;
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1090
} else {
1964
1965
if(quit_now){
1966
goto end;
1967
}
1968
1969
while(not quit_now){
1970
ret = start_mandos_communication(address, port, if_index, af);
1971
if(quit_now or ret == 0){
1972
break;
1973
}
1974
if(debug){
1975
fprintf(stderr, "Retrying in %d seconds\n",
1976
(int)retry_interval);
1977
}
1978
sleep((int)retry_interval);
1979
}
1980
1981
if (not quit_now){
1091
1982
exitcode = EXIT_SUCCESS;
1092
1983
}
1984
1093
1985
goto end;
1094
1986
}
1095
1987
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;
1988
if(quit_now){
1108
1989
goto end;
1109
1990
}
1110
1991
1130
2011
if(mc.server == NULL){
1131
2012
fprintf(stderr, "Failed to create Avahi server: %s\n",
1132
2013
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
2014
exitcode = EX_UNAVAILABLE;
2015
goto end;
2016
}
2017
2018
if(quit_now){
1134
2019
goto end;
1135
2020
}
1136
2021
1137
2022
/* Create the Avahi service browser */
1138
2023
sb = avahi_s_service_browser_new(mc.server, if_index,
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
2024
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2025
NULL, 0, browse_callback, NULL);
1141
2026
if(sb == NULL){
1142
2027
fprintf(stderr, "Failed to create service browser: %s\n",
1143
2028
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
2029
exitcode = EX_UNAVAILABLE;
2030
goto end;
2031
}
2032
2033
if(quit_now){
1145
2034
goto end;
1146
2035
}
1147
2036
1150
2039
if(debug){
1151
2040
fprintf(stderr, "Starting Avahi loop search\n");
1152
2041
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
2042
2043
ret = avahi_loop_with_timeout(mc.simple_poll,
2044
(int)(retry_interval * 1000));
2045
if(debug){
2046
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2047
(ret == 0) ? "successfully" : "with error");
2048
}
1155
2049
1156
2050
end:
1157
2051
1178
2072
if(gpgme_initialized){
1179
2073
gpgme_release(mc.ctx);
1180
2074
}
1181
1182
/* Removes the temp directory used by GPGME */
2075
2076
/* Cleans up the circular linked list of Mandos servers the client
2077
has seen */
2078
if(mc.current_server != NULL){
2079
mc.current_server->prev->next = NULL;
2080
while(mc.current_server != NULL){
2081
server *next = mc.current_server->next;
2082
free(mc.current_server);
2083
mc.current_server = next;
2084
}
2085
}
2086
2087
/* XXX run network hooks "stop" here */
2088
2089
/* Take down the network interface */
2090
if(take_down_interface){
2091
/* Re-raise priviliges */
2092
errno = 0;
2093
ret = seteuid(0);
2094
if(ret == -1){
2095
perror_plus("seteuid");
2096
}
2097
if(geteuid() == 0){
2098
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2099
if(ret == -1){
2100
perror_plus("ioctl SIOCGIFFLAGS");
2101
} else if(network.ifr_flags & IFF_UP) {
2102
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2104
if(ret == -1){
2105
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2106
}
2107
}
2108
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2109
if(ret == -1){
2110
perror_plus("close");
2111
}
2112
/* Lower privileges permanently */
2113
errno = 0;
2114
ret = setuid(uid);
2115
if(ret == -1){
2116
perror_plus("setuid");
2117
}
2118
}
2119
}
2120
2121
/* Removes the GPGME temp directory and all files inside */
1183
2122
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
}
2123
struct dirent **direntries = NULL;
2124
struct dirent *direntry = NULL;
2125
int numentries = scandir(tempdir, &direntries, notdotentries,
2126
alphasort);
2127
if (numentries > 0){
2128
for(int i = 0; i < numentries; i++){
2129
direntry = direntries[i];
1204
2130
char *fullname = NULL;
1205
2131
ret = asprintf(&fullname, "%s/%s", tempdir,
1206
2132
direntry->d_name);
1207
2133
if(ret < 0){
1208
perror("asprintf");
2134
perror_plus("asprintf");
1209
2135
continue;
1210
2136
}
1211
2137
ret = remove(fullname);
1215
2141
}
1216
2142
free(fullname);
1217
2143
}
1218
closedir(d);
2144
}
2145
2146
/* need to clean even if 0 because man page doesn't specify */
2147
free(direntries);
2148
if (numentries == -1){
2149
perror_plus("scandir");
1219
2150
}
1220
2151
ret = rmdir(tempdir);
1221
2152
if(ret == -1 and errno != ENOENT){
1222
perror("rmdir");
1223
}
2153
perror_plus("rmdir");
2154
}
2155
}
2156
2157
if(quit_now){
2158
sigemptyset(&old_sigterm_action.sa_mask);
2159
old_sigterm_action.sa_handler = SIG_DFL;
2160
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2161
&old_sigterm_action,
2162
NULL));
2163
if(ret == -1){
2164
perror_plus("sigaction");
2165
}
2166
do {
2167
ret = raise(signal_received);
2168
} while(ret != 0 and errno == EINTR);
2169
if(ret != 0){
2170
perror_plus("raise");
2171
abort();
2172
}
2173
TEMP_FAILURE_RETRY(pause());
1224
2174
}
1225
2175
1226
2176
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0