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- Committer: Teddy Hogeborn
- Date: 2016-03-13 22:00:48 UTC
- Revision ID: teddy@recompile.se-20160313220048-kd3k2gyviupsw1oj
Tags: version-1.7.6-1
Update version number to 1.7.6
* Makefile (version): Changed to "1.7.6"
* NEWS (Version 1.7.6): New entry.
* debian/changelog(1.7.6-1): - '' -
* Makefile (version): Changed to "1.7.6"
* NEWS (Version 1.7.6): New entry.
* debian/changelog(1.7.6-1): - '' -
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
43
stdout, ferror() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
66
70
program_invocation_short_name */
67
71
#include <time.h> /* nanosleep(), time(), sleep() */
68
72
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
77
*/
74
78
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
79
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
78
83
#include <iso646.h> /* not, or, and */
79
84
#include <argp.h> /* struct argp_option, error_t, struct
80
85
argp_state, struct argp,
88
93
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
94
WEXITSTATUS(), WTERMSIG() */
90
95
#include <grp.h> /* setgroups() */
96
#include <argz.h> /* argz_add_sep(), argz_next(),
97
argz_delete(), argz_append(),
98
argz_stringify(), argz_add(),
99
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
91
102
92
103
#ifdef __linux__
93
104
#include <sys/klog.h> /* klogctl() */
135
146
static const char sys_class_net[] = "/sys/class/net";
136
147
char *connect_to = NULL;
137
148
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
138
150
uid_t uid = 65534;
139
151
gid_t gid = 65534;
140
152
141
153
/* Doubly linked list that need to be circularly linked when used */
142
154
typedef struct server{
143
155
const char *ip;
144
uint16_t port;
156
in_port_t port;
145
157
AvahiIfIndex if_index;
146
158
int af;
147
159
struct timespec last_seen;
151
163
152
164
/* Used for passing in values through the Avahi callback functions */
153
165
typedef struct {
154
AvahiSimplePoll *simple_poll;
155
166
AvahiServer *server;
156
167
gnutls_certificate_credentials_t cred;
157
168
unsigned int dh_bits;
159
170
const char *priority;
160
171
gpgme_ctx_t ctx;
161
172
server *current_server;
173
char *interfaces;
174
size_t interfaces_size;
162
175
} mandos_context;
163
176
164
/* global context so signal handler can reach it*/
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
177
/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
169
179
170
180
sig_atomic_t quit_now = 0;
171
181
int signal_received = 0;
179
189
perror(print_text);
180
190
}
181
191
182
__attribute__((format (gnu_printf, 2, 3)))
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
193
int fprintf_plus(FILE *stream, const char *format, ...){
184
194
va_list ap;
185
195
va_start (ap, format);
186
196
187
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
198
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
200
}
191
201
192
202
/*
194
204
* bytes. "buffer_capacity" is how much is currently allocated,
195
205
* "buffer_length" is how much is already used.
196
206
*/
207
__attribute__((nonnull, warn_unused_result))
197
208
size_t incbuffer(char **buffer, size_t buffer_length,
198
209
size_t buffer_capacity){
199
210
if(buffer_length + BUFFER_SIZE > buffer_capacity){
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
if(buffer == NULL){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
212
if(new_buf == NULL){
213
int old_errno = errno;
214
free(*buffer);
215
errno = old_errno;
216
*buffer = NULL;
202
217
return 0;
203
218
}
219
*buffer = new_buf;
204
220
buffer_capacity += BUFFER_SIZE;
205
221
}
206
222
return buffer_capacity;
207
223
}
208
224
209
225
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
226
__attribute__((nonnull, warn_unused_result))
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
212
229
int ret;
213
230
server *new_server = malloc(sizeof(server));
214
231
if(new_server == NULL){
221
238
.af = af };
222
239
if(new_server->ip == NULL){
223
240
perror_plus("strdup");
241
free(new_server);
242
return false;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
224
256
return false;
225
257
}
226
258
/* Special case of first server */
227
if (mc.current_server == NULL){
259
if(*current_server == NULL){
228
260
new_server->next = new_server;
229
261
new_server->prev = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
262
*current_server = new_server;
232
263
} else {
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
235
267
new_server->prev->next = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
268
(*current_server)->prev = new_server;
242
269
}
243
270
return true;
244
271
}
246
273
/*
247
274
* Initialize GPGME.
248
275
*/
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
251
281
gpgme_error_t rc;
252
282
gpgme_engine_info_t engine_info;
253
283
254
255
284
/*
256
285
* Helper function to insert pub and seckey to the engine keyring.
257
286
*/
258
bool import_key(const char *filename){
287
bool import_key(const char * const filename){
259
288
int ret;
260
289
int fd;
261
290
gpgme_data_t pgp_data;
273
302
return false;
274
303
}
275
304
276
rc = gpgme_op_import(mc.ctx, pgp_data);
305
rc = gpgme_op_import(mc->ctx, pgp_data);
277
306
if(rc != GPG_ERR_NO_ERROR){
278
307
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
308
gpgme_strsource(rc), gpgme_strerror(rc));
280
309
return false;
281
310
}
282
311
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
312
ret = close(fd);
284
313
if(ret == -1){
285
314
perror_plus("close");
286
315
}
323
352
}
324
353
325
354
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc.ctx));
355
rc = gpgme_new(&(mc->ctx));
327
356
if(rc != GPG_ERR_NO_ERROR){
328
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
342
371
* Decrypt OpenPGP data.
343
372
* Returns -1 on error
344
373
*/
374
__attribute__((nonnull, warn_unused_result))
345
375
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
376
size_t crypto_size,
347
char **plaintext){
377
char **plaintext,
378
mandos_context *mc){
348
379
gpgme_data_t dh_crypto, dh_plain;
349
380
gpgme_error_t rc;
350
381
ssize_t ret;
376
407
377
408
/* Decrypt data from the cryptotext data buffer to the plaintext
378
409
data buffer */
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
380
411
if(rc != GPG_ERR_NO_ERROR){
381
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
413
gpgme_strsource(rc), gpgme_strerror(rc));
383
414
plaintext_length = -1;
384
415
if(debug){
385
416
gpgme_decrypt_result_t result;
386
result = gpgme_op_decrypt_result(mc.ctx);
417
result = gpgme_op_decrypt_result(mc->ctx);
387
418
if(result == NULL){
388
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
389
420
} else {
466
497
return plaintext_length;
467
498
}
468
499
469
static const char * safer_gnutls_strerror(int value){
470
const char *ret = gnutls_strerror(value); /* Spurious warning from
471
-Wunreachable-code */
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
509
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
475
511
}
476
512
477
513
/* GnuTLS log function callback */
514
__attribute__((nonnull))
478
515
static void debuggnutls(__attribute__((unused)) int level,
479
516
const char* string){
480
517
fprintf_plus(stderr, "GnuTLS: %s", string);
481
518
}
482
519
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
521
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename){
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
mandos_context *mc){
485
525
int ret;
526
unsigned int uret;
486
527
487
528
if(debug){
488
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
489
530
}
490
531
491
ret = gnutls_global_init();
492
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
495
return -1;
496
}
497
498
532
if(debug){
499
533
/* "Use a log level over 10 to enable all debugging options."
500
534
* - GnuTLS manual
504
538
}
505
539
506
540
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
508
542
if(ret != GNUTLS_E_SUCCESS){
509
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
544
safer_gnutls_strerror(ret));
511
gnutls_global_deinit();
512
545
return -1;
513
546
}
514
547
520
553
}
521
554
522
555
ret = gnutls_certificate_set_openpgp_key_file
523
(mc.cred, pubkeyfilename, seckeyfilename,
556
(mc->cred, pubkeyfilename, seckeyfilename,
524
557
GNUTLS_OPENPGP_FMT_BASE64);
525
558
if(ret != GNUTLS_E_SUCCESS){
526
559
fprintf_plus(stderr,
532
565
}
533
566
534
567
/* GnuTLS server initialization */
535
ret = gnutls_dh_params_init(&mc.dh_params);
568
ret = gnutls_dh_params_init(&mc->dh_params);
536
569
if(ret != GNUTLS_E_SUCCESS){
537
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
571
" initialization: %s\n",
539
572
safer_gnutls_strerror(ret));
540
573
goto globalfail;
541
574
}
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
546
goto globalfail;
547
}
548
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
550
748
551
749
return 0;
552
750
553
751
globalfail:
554
752
555
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
558
755
return -1;
559
756
}
560
757
561
static int init_gnutls_session(gnutls_session_t *session){
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
760
mandos_context *mc){
562
761
int ret;
563
762
/* GnuTLS session creation */
564
763
do {
576
775
{
577
776
const char *err;
578
777
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
580
779
if(quit_now){
581
780
gnutls_deinit(*session);
582
781
return -1;
593
792
594
793
do {
595
794
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
795
mc->cred);
597
796
if(quit_now){
598
797
gnutls_deinit(*session);
599
798
return -1;
609
808
/* ignore client certificate if any. */
610
809
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
810
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
614
811
return 0;
615
812
}
616
813
618
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
816
__attribute__((unused)) const char *txt){}
620
817
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
823
if(seteuid(0) == -1){
824
ret = errno;
825
}
826
errno = old_errno;
827
return ret;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
836
errno = old_errno;
837
return ret;
838
}
839
if(setuid(0) == -1){
840
ret = errno;
841
}
842
errno = old_errno;
843
return ret;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
851
if(seteuid(uid) == -1){
852
ret = errno;
853
}
854
errno = old_errno;
855
return ret;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
863
if(setuid(uid) == -1){
864
ret = errno;
865
}
866
errno = old_errno;
867
return ret;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
621
1036
/* Called when a Mandos server is found */
622
static int start_mandos_communication(const char *ip, uint16_t port,
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
623
1039
AvahiIfIndex if_index,
624
int af){
1040
int af, mandos_context *mc){
625
1041
int ret, tcp_sd = -1;
626
1042
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1043
struct sockaddr_storage to;
631
1044
char *buffer = NULL;
632
1045
char *decrypted_buffer = NULL;
633
1046
size_t buffer_length = 0;
636
1049
int retval = -1;
637
1050
gnutls_session_t session;
638
1051
int pf; /* Protocol family */
1052
bool route_added = false;
639
1053
640
1054
errno = 0;
641
1055
657
1071
return -1;
658
1072
}
659
1073
660
ret = init_gnutls_session(&session);
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1077
bool match = false;
1078
{
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1081
interface))){
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1083
match = true;
1084
break;
1085
}
1086
}
1087
}
1088
if(not match){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1091
if(debug){
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1095
} else {
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1097
" \"%s\"\n",
1098
if_indextoname((unsigned int)if_index,
1099
interface));
1100
}
1101
}
1102
return -1;
1103
}
1104
}
1105
1106
ret = init_gnutls_session(&session, mc);
661
1107
if(ret != 0){
662
1108
return -1;
663
1109
}
664
1110
665
1111
if(debug){
666
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
1113
PRIuMAX "\n", ip, (uintmax_t)port);
668
1114
}
669
1115
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
671
1117
if(tcp_sd < 0){
672
1118
int e = errno;
673
1119
perror_plus("socket");
680
1126
goto mandos_end;
681
1127
}
682
1128
683
memset(&to, 0, sizeof(to));
684
1129
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
687
1133
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
690
1137
}
691
1138
if(ret < 0 ){
692
1139
int e = errno;
701
1148
goto mandos_end;
702
1149
}
703
1150
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port); /* Spurious warnings from
705
-Wconversion and
706
-Wunreachable-code */
707
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
711
1154
if(if_index == AVAHI_IF_UNSPEC){
712
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
713
1156
" incomplete without a network interface\n");
715
1158
goto mandos_end;
716
1159
}
717
1160
/* Set the network interface number as scope */
718
to.in6.sin6_scope_id = (uint32_t)if_index;
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
719
1162
}
720
1163
} else {
721
to.in.sin_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
724
1165
}
725
1166
726
1167
if(quit_now){
734
1175
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
1176
perror_plus("if_indextoname");
736
1177
} else {
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
739
1180
}
740
1181
} else {
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
743
1184
}
744
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
const char *pcret;
747
if(af == AF_INET6){
748
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
sizeof(addrstr));
750
} else {
751
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
752
sizeof(addrstr));
753
}
754
if(pcret == NULL){
755
perror_plus("inet_ntop");
756
} else {
757
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
759
}
760
}
761
}
762
763
if(quit_now){
764
errno = EINTR;
765
goto mandos_end;
766
}
767
768
if(af == AF_INET6){
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
770
} else {
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
}
773
if(ret < 0){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
779
goto mandos_end;
780
}
781
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
1187
if(af == AF_INET6){
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1191
NI_NUMERICHOST);
1192
} else {
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
}
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1204
}
1205
}
1206
1207
if(quit_now){
1208
errno = EINTR;
1209
goto mandos_end;
1210
}
1211
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
785
1267
}
786
1268
787
1269
const char *out = mandos_protocol_version;
938
1420
if(buffer_length > 0){
939
1421
ssize_t decrypted_buffer_size;
940
1422
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
941
&decrypted_buffer);
1423
&decrypted_buffer, mc);
942
1424
if(decrypted_buffer_size >= 0){
943
1425
944
1426
written = 0;
970
1452
971
1453
mandos_end:
972
1454
{
1455
if(route_added){
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1459
}
1460
}
973
1461
int e = errno;
974
1462
free(decrypted_buffer);
975
1463
free(buffer);
976
1464
if(tcp_sd >= 0){
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1465
ret = close(tcp_sd);
978
1466
}
979
1467
if(ret == -1){
980
1468
if(e == 0){
992
1480
return retval;
993
1481
}
994
1482
1483
__attribute__((nonnull))
995
1484
static void resolve_callback(AvahiSServiceResolver *r,
996
1485
AvahiIfIndex interface,
997
1486
AvahiProtocol proto,
1005
1494
AVAHI_GCC_UNUSED AvahiStringList *txt,
1006
1495
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1007
1496
flags,
1008
AVAHI_GCC_UNUSED void* userdata){
1009
assert(r);
1497
void *mc){
1498
if(r == NULL){
1499
return;
1500
}
1010
1501
1011
1502
/* Called whenever a service has been resolved successfully or
1012
1503
timed out */
1013
1504
1014
1505
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1015
1507
return;
1016
1508
}
1017
1509
1021
1513
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1022
1514
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1023
1515
domain,
1024
avahi_strerror(avahi_server_errno(mc.server)));
1516
avahi_strerror(avahi_server_errno
1517
(((mandos_context*)mc)->server)));
1025
1518
break;
1026
1519
1027
1520
case AVAHI_RESOLVER_FOUND:
1033
1526
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
1527
host_name, ip, (intmax_t)interface, port);
1035
1528
}
1036
int ret = start_mandos_communication(ip, port, interface,
1037
avahi_proto_to_af(proto));
1529
int ret = start_mandos_communication(ip, (in_port_t)port,
1530
interface,
1531
avahi_proto_to_af(proto),
1532
mc);
1038
1533
if(ret == 0){
1039
avahi_simple_poll_quit(mc.simple_poll);
1534
avahi_simple_poll_quit(simple_poll);
1040
1535
} else {
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1536
if(not add_server(ip, (in_port_t)port, interface,
1537
avahi_proto_to_af(proto),
1538
&((mandos_context*)mc)->current_server)){
1043
1539
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
1540
" list\n", name);
1045
1541
}
1058
1554
const char *domain,
1059
1555
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
1556
flags,
1061
AVAHI_GCC_UNUSED void* userdata){
1062
assert(b);
1557
void *mc){
1558
if(b == NULL){
1559
return;
1560
}
1063
1561
1064
1562
/* Called whenever a new services becomes available on the LAN or
1065
1563
is removed from the LAN */
1073
1571
case AVAHI_BROWSER_FAILURE:
1074
1572
1075
1573
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
1574
avahi_strerror(avahi_server_errno
1575
(((mandos_context*)mc)->server)));
1576
avahi_simple_poll_quit(simple_poll);
1078
1577
return;
1079
1578
1080
1579
case AVAHI_BROWSER_NEW:
1083
1582
the callback function is called the Avahi server will free the
1084
1583
resolver for us. */
1085
1584
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
resolve_callback, NULL) == NULL)
1585
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1586
interface, protocol, name, type,
1587
domain, protocol, 0,
1588
resolve_callback, mc) == NULL)
1089
1589
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
1590
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
1591
avahi_strerror(avahi_server_errno
1592
(((mandos_context*)mc)->server)));
1092
1593
break;
1093
1594
1094
1595
case AVAHI_BROWSER_REMOVE:
1113
1614
signal_received = sig;
1114
1615
int old_errno = errno;
1115
1616
/* set main loop to exit */
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1617
if(simple_poll != NULL){
1618
avahi_simple_poll_quit(simple_poll);
1118
1619
}
1119
1620
errno = old_errno;
1120
1621
}
1121
1622
1623
__attribute__((nonnull, warn_unused_result))
1122
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
1625
int ret;
1626
int old_errno;
1124
1627
1125
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1126
1629
if(s < 0){
1630
old_errno = errno;
1127
1631
perror_plus("socket");
1632
errno = old_errno;
1128
1633
return false;
1129
1634
}
1130
strcpy(ifr->ifr_name, ifname);
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1131
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
1638
if(ret == -1){
1133
1639
if(debug){
1640
old_errno = errno;
1134
1641
perror_plus("ioctl SIOCGIFFLAGS");
1642
errno = old_errno;
1135
1643
}
1136
1644
return false;
1137
1645
}
1138
1646
return true;
1139
1647
}
1140
1648
1649
__attribute__((nonnull, warn_unused_result))
1141
1650
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1651
1143
1652
/* Reject the loopback device */
1185
1694
* corresponds to an acceptable network device.
1186
1695
* (This function is passed to scandir(3) as a filter function.)
1187
1696
*/
1697
__attribute__((nonnull, warn_unused_result))
1188
1698
int good_interface(const struct dirent *if_entry){
1189
1699
if(if_entry->d_name[0] == '.'){
1190
1700
return 0;
1206
1716
}
1207
1717
1208
1718
/*
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1719
* This function determines if a network interface is up.
1720
*/
1721
__attribute__((nonnull, warn_unused_result))
1722
bool interface_is_up(const char *interface){
1723
struct ifreq ifr;
1724
if(not get_flags(interface, &ifr)){
1725
if(debug){
1726
fprintf_plus(stderr, "Failed to get flags for interface "
1727
"\"%s\"\n", interface);
1728
}
1729
return false;
1730
}
1731
1732
return (bool)(ifr.ifr_flags & IFF_UP);
1733
}
1734
1735
/*
1736
* This function determines if a network interface is running
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_running(const char *interface){
1740
struct ifreq ifr;
1741
if(not get_flags(interface, &ifr)){
1742
if(debug){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1745
}
1746
return false;
1747
}
1748
1749
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1750
}
1751
1752
__attribute__((nonnull, pure, warn_unused_result))
1251
1753
int notdotentries(const struct dirent *direntry){
1252
1754
/* Skip "." and ".." */
1253
1755
if(direntry->d_name[0] == '.'
1260
1762
}
1261
1763
1262
1764
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1263
1766
int runnable_hook(const struct dirent *direntry){
1264
1767
int ret;
1265
1768
size_t sret;
1273
1776
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
1777
"abcdefghijklmnopqrstuvwxyz"
1275
1778
"0123456789"
1276
"_-");
1779
"_.-");
1277
1780
if((direntry->d_name)[sret] != '\0'){
1278
1781
/* Contains non-allowed characters */
1279
1782
if(debug){
1283
1786
return 0;
1284
1787
}
1285
1788
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1294
1790
if(ret == -1){
1295
1791
if(debug){
1296
1792
perror_plus("Could not stat hook");
1320
1816
return 1;
1321
1817
}
1322
1818
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1819
__attribute__((nonnull, warn_unused_result))
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
mandos_context *mc){
1324
1822
int ret;
1325
1823
struct timespec now;
1326
1824
struct timespec waited_time;
1327
1825
intmax_t block_time;
1328
1826
1329
1827
while(true){
1330
if(mc.current_server == NULL){
1331
if (debug){
1828
if(mc->current_server == NULL){
1829
if(debug){
1332
1830
fprintf_plus(stderr, "Wait until first server is found."
1333
1831
" No timeout!\n");
1334
1832
}
1335
1833
ret = avahi_simple_poll_iterate(s, -1);
1336
1834
} else {
1337
if (debug){
1835
if(debug){
1338
1836
fprintf_plus(stderr, "Check current_server if we should run"
1339
1837
" it, or wait\n");
1340
1838
}
1347
1845
/* Calculating in ms how long time between now and server
1348
1846
who we visted longest time ago. Now - last seen. */
1349
1847
waited_time.tv_sec = (now.tv_sec
1350
- mc.current_server->last_seen.tv_sec);
1848
- mc->current_server->last_seen.tv_sec);
1351
1849
waited_time.tv_nsec = (now.tv_nsec
1352
- mc.current_server->last_seen.tv_nsec);
1850
- mc->current_server->last_seen.tv_nsec);
1353
1851
/* total time is 10s/10,000ms.
1354
1852
Converting to s from ms by dividing by 1,000,
1355
1853
and ns to ms by dividing by 1,000,000. */
1357
1855
- ((intmax_t)waited_time.tv_sec * 1000))
1358
1856
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
1857
1360
if (debug){
1858
if(debug){
1361
1859
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
1860
block_time);
1363
1861
}
1364
1862
1365
1863
if(block_time <= 0){
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1864
ret = start_mandos_communication(mc->current_server->ip,
1865
mc->current_server->port,
1866
mc->current_server->if_index,
1867
mc->current_server->af, mc);
1370
1868
if(ret == 0){
1371
avahi_simple_poll_quit(mc.simple_poll);
1869
avahi_simple_poll_quit(s);
1372
1870
return 0;
1373
1871
}
1374
1872
ret = clock_gettime(CLOCK_MONOTONIC,
1375
&mc.current_server->last_seen);
1873
&mc->current_server->last_seen);
1376
1874
if(ret == -1){
1377
1875
perror_plus("clock_gettime");
1378
1876
return -1;
1379
1877
}
1380
mc.current_server = mc.current_server->next;
1878
mc->current_server = mc->current_server->next;
1381
1879
block_time = 0; /* Call avahi to find new Mandos
1382
1880
servers, but don't block */
1383
1881
}
1385
1883
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
1884
}
1387
1885
if(ret != 0){
1388
if (ret > 0 or errno != EINTR){
1886
if(ret > 0 or errno != EINTR){
1389
1887
return (ret != 1) ? ret : 0;
1390
1888
}
1391
1889
}
1392
1890
}
1393
1891
}
1394
1892
1395
/* Set effective uid to 0, return errno */
1396
int raise_privileges(void){
1397
int old_errno = errno;
1398
int ret_errno = 0;
1399
errno = 0;
1400
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1402
}
1403
ret_errno = errno;
1404
errno = old_errno;
1405
return ret_errno;
1406
}
1407
1408
/* Set effective and real user ID to 0. Return errno. */
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1412
if(ret_errno != 0){
1413
errno = old_errno;
1414
return ret_errno;
1415
}
1416
errno = 0;
1417
if(setuid(0) == -1){
1418
perror_plus("seteuid");
1419
}
1420
ret_errno = errno;
1421
errno = old_errno;
1422
return ret_errno;
1423
}
1424
1425
/* Set effective user ID to unprivileged saved user ID */
1426
int lower_privileges(void){
1427
int old_errno = errno;
1428
int ret_errno = 0;
1429
errno = 0;
1430
if(seteuid(uid) == -1){
1431
perror_plus("seteuid");
1432
}
1433
ret_errno = errno;
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
bool run_network_hooks(const char *mode, const char *interface,
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1439
1895
const float delay){
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1442
int ret;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1444
alphasort);
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1899
| O_CLOEXEC);
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1902
if(debug){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1905
}
1906
} else {
1907
perror_plus("open");
1908
}
1909
return;
1910
}
1911
}
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1445
1914
if(numhooks == -1){
1446
1915
perror_plus("scandir");
1447
} else {
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1453
if(ret < 0){
1916
return;
1917
}
1918
struct dirent *direntry;
1919
int ret;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1927
if(debug){
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1929
direntry->d_name);
1930
}
1931
pid_t hook_pid = fork();
1932
if(hook_pid == 0){
1933
/* Child */
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1936
if(errno != 0){
1937
perror_plus("Failed to raise privileges");
1938
_exit(EX_NOPERM);
1939
}
1940
/* Set group */
1941
errno = 0;
1942
ret = setgid(0);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
_exit(EX_NOPERM);
1946
}
1947
/* Reset supplementary groups */
1948
errno = 0;
1949
ret = setgroups(0, NULL);
1950
if(ret == -1){
1951
perror_plus("setgroups");
1952
_exit(EX_NOPERM);
1953
}
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1955
if(ret == -1){
1956
perror_plus("setenv");
1957
_exit(EX_OSERR);
1958
}
1959
ret = setenv("DEVICE", interface, 1);
1960
if(ret == -1){
1961
perror_plus("setenv");
1962
_exit(EX_OSERR);
1963
}
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1965
if(ret == -1){
1966
perror_plus("setenv");
1967
_exit(EX_OSERR);
1968
}
1969
ret = setenv("MODE", mode, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
char *delaystring;
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1976
if(ret == -1){
1454
1977
perror_plus("asprintf");
1455
continue;
1456
}
1457
if(debug){
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1459
direntry->d_name);
1460
}
1461
pid_t hook_pid = fork();
1462
if(hook_pid == 0){
1463
/* Child */
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1466
/* Set group */
1467
errno = 0;
1468
ret = setgid(0);
1469
if(ret == -1){
1470
perror_plus("setgid");
1471
}
1472
/* Reset supplementary groups */
1473
errno = 0;
1474
ret = setgroups(0, NULL);
1475
if(ret == -1){
1476
perror_plus("setgroups");
1477
}
1478
dup2(devnull, STDIN_FILENO);
1479
close(devnull);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1482
if(ret == -1){
1483
perror_plus("setenv");
1484
_exit(EX_OSERR);
1485
}
1486
ret = setenv("DEVICE", interface, 1);
1487
if(ret == -1){
1488
perror_plus("setenv");
1489
_exit(EX_OSERR);
1490
}
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1492
if(ret == -1){
1493
perror_plus("setenv");
1494
_exit(EX_OSERR);
1495
}
1496
ret = setenv("MODE", mode, 1);
1497
if(ret == -1){
1498
perror_plus("setenv");
1499
_exit(EX_OSERR);
1500
}
1501
char *delaystring;
1502
ret = asprintf(&delaystring, "%f", delay);
1503
if(ret == -1){
1504
perror_plus("asprintf");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DELAY", delaystring, 1);
1508
if(ret == -1){
1509
free(delaystring);
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
if(ret == -1){
1513
1982
free(delaystring);
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
}
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
1524
}
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
free(delaystring);
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
}
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1995
direntry->d_name,
1996
O_RDONLY));
1997
if(hook_fd == -1){
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2000
}
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2004
}
2005
ret = dup2(devnull, STDIN_FILENO);
2006
if(ret == -1){
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2008
_exit(EX_OSERR);
2009
}
2010
ret = close(devnull);
2011
if(ret == -1){
2012
perror_plus("close");
2013
_exit(EX_OSERR);
2014
}
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2016
if(ret == -1){
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2018
_exit(EX_OSERR);
2019
}
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2021
environ) == -1){
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2024
}
2025
} else {
2026
if(hook_pid == -1){
2027
perror_plus("fork");
2028
free(direntry);
2029
continue;
2030
}
2031
int status;
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2034
free(direntry);
2035
continue;
2036
}
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2042
free(direntry);
2043
continue;
2044
}
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2048
WTERMSIG(status));
2049
free(direntry);
2050
continue;
1525
2051
} else {
1526
int status;
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1529
free(fullname);
1530
continue;
1531
}
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1537
free(fullname);
1538
continue;
1539
}
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1543
WTERMSIG(status));
1544
free(fullname);
1545
continue;
1546
} else {
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1549
free(fullname);
1550
continue;
1551
}
1552
}
1553
free(fullname);
1554
if(debug){
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1556
direntry->d_name);
1557
}
1558
}
1559
close(devnull);
1560
}
1561
return true;
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2054
free(direntry);
2055
continue;
2056
}
2057
}
2058
if(debug){
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2060
direntry->d_name);
2061
}
2062
free(direntry);
2063
}
2064
free(direntries);
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2067
} else {
2068
hookdir_fd = -1;
2069
}
2070
close(devnull);
1562
2071
}
1563
2072
1564
int bring_up_interface(const char * const interface, const float delay){
1565
int sd = -1;
2073
__attribute__((nonnull, warn_unused_result))
2074
int bring_up_interface(const char *const interface,
2075
const float delay){
1566
2076
int old_errno = errno;
1567
int ret_errno = 0;
1568
2077
int ret;
1569
2078
struct ifreq network;
1570
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
2079
unsigned int if_index = if_nametoindex(interface);
1571
2080
if(if_index == 0){
1572
2081
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1573
2082
errno = old_errno;
1579
2088
return EINTR;
1580
2089
}
1581
2090
1582
/* Re-raise priviliges */
1583
raise_privileges();
1584
1585
#ifdef __linux__
1586
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1587
messages about the network interface to mess up the prompt */
1588
ret = klogctl(8, NULL, 5);
1589
bool restore_loglevel = true;
1590
if(ret == -1){
1591
restore_loglevel = false;
1592
perror_plus("klogctl");
1593
}
1594
#endif /* __linux__ */
1595
1596
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1597
if(sd < 0){
1598
ret_errno = errno;
1599
perror_plus("socket");
1600
#ifdef __linux__
1601
if(restore_loglevel){
1602
ret = klogctl(7, NULL, 0);
1603
if(ret == -1){
1604
perror_plus("klogctl");
1605
}
1606
}
1607
#endif /* __linux__ */
1608
/* Lower privileges */
1609
lower_privileges();
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
ret_errno = errno;
1617
perror_plus("ioctl SIOCGIFFLAGS");
1618
#ifdef __linux__
1619
if(restore_loglevel){
1620
ret = klogctl(7, NULL, 0);
1621
if(ret == -1){
1622
perror_plus("klogctl");
1623
}
1624
}
1625
#endif /* __linux__ */
1626
/* Lower privileges */
1627
lower_privileges();
1628
errno = old_errno;
1629
return ret_errno;
1630
}
1631
if((network.ifr_flags & IFF_UP) == 0){
1632
network.ifr_flags |= IFF_UP;
1633
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2091
if(not interface_is_up(interface)){
2092
int ret_errno = 0;
2093
int ioctl_errno = 0;
2094
if(not get_flags(interface, &network)){
2095
ret_errno = errno;
2096
fprintf_plus(stderr, "Failed to get flags for interface "
2097
"\"%s\"\n", interface);
2098
errno = old_errno;
2099
return ret_errno;
2100
}
2101
network.ifr_flags |= IFF_UP; /* set flag */
2102
2103
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2104
if(sd == -1){
2105
ret_errno = errno;
2106
perror_plus("socket");
2107
errno = old_errno;
2108
return ret_errno;
2109
}
2110
2111
if(quit_now){
2112
ret = close(sd);
2113
if(ret == -1){
2114
perror_plus("close");
2115
}
2116
errno = old_errno;
2117
return EINTR;
2118
}
2119
2120
if(debug){
2121
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2122
interface);
2123
}
2124
2125
/* Raise privileges */
2126
ret_errno = raise_privileges();
2127
if(ret_errno != 0){
2128
errno = ret_errno;
2129
perror_plus("Failed to raise privileges");
2130
}
2131
2132
#ifdef __linux__
2133
int ret_linux;
2134
bool restore_loglevel = false;
2135
if(ret_errno == 0){
2136
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2137
messages about the network interface to mess up the prompt */
2138
ret_linux = klogctl(8, NULL, 5);
2139
if(ret_linux == -1){
2140
perror_plus("klogctl");
2141
} else {
2142
restore_loglevel = true;
2143
}
2144
}
2145
#endif /* __linux__ */
2146
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2147
ioctl_errno = errno;
2148
#ifdef __linux__
2149
if(restore_loglevel){
2150
ret_linux = klogctl(7, NULL, 0);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2153
}
2154
}
2155
#endif /* __linux__ */
2156
2157
/* If raise_privileges() succeeded above */
2158
if(ret_errno == 0){
2159
/* Lower privileges */
2160
ret_errno = lower_privileges();
2161
if(ret_errno != 0){
2162
errno = ret_errno;
2163
perror_plus("Failed to lower privileges");
2164
}
2165
}
2166
2167
/* Close the socket */
2168
ret = close(sd);
1634
2169
if(ret == -1){
1635
ret_errno = errno;
2170
perror_plus("close");
2171
}
2172
2173
if(ret_setflags == -1){
2174
errno = ioctl_errno;
1636
2175
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1637
#ifdef __linux__
1638
if(restore_loglevel){
1639
ret = klogctl(7, NULL, 0);
1640
if(ret == -1){
1641
perror_plus("klogctl");
1642
}
1643
}
1644
#endif /* __linux__ */
1645
/* Lower privileges */
1646
lower_privileges();
1647
2176
errno = old_errno;
1648
return ret_errno;
2177
return ioctl_errno;
1649
2178
}
2179
} else if(debug){
2180
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2181
interface);
1650
2182
}
2183
1651
2184
/* Sleep checking until interface is running.
1652
2185
Check every 0.25s, up to total time of delay */
1653
2186
for(int i=0; i < delay * 4; i++){
1654
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1655
if(ret == -1){
1656
perror_plus("ioctl SIOCGIFFLAGS");
1657
} else if(network.ifr_flags & IFF_RUNNING){
2187
if(interface_is_running(interface)){
1658
2188
break;
1659
2189
}
1660
2190
struct timespec sleeptime = { .tv_nsec = 250000000 };
1663
2193
perror_plus("nanosleep");
1664
2194
}
1665
2195
}
1666
/* Close the socket */
1667
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1668
if(ret == -1){
1669
perror_plus("close");
2196
2197
errno = old_errno;
2198
return 0;
2199
}
2200
2201
__attribute__((nonnull, warn_unused_result))
2202
int take_down_interface(const char *const interface){
2203
int old_errno = errno;
2204
struct ifreq network;
2205
unsigned int if_index = if_nametoindex(interface);
2206
if(if_index == 0){
2207
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2208
errno = old_errno;
2209
return ENXIO;
1670
2210
}
1671
#ifdef __linux__
1672
if(restore_loglevel){
1673
/* Restores kernel loglevel to default */
1674
ret = klogctl(7, NULL, 0);
2211
if(interface_is_up(interface)){
2212
int ret_errno = 0;
2213
int ioctl_errno = 0;
2214
if(not get_flags(interface, &network) and debug){
2215
ret_errno = errno;
2216
fprintf_plus(stderr, "Failed to get flags for interface "
2217
"\"%s\"\n", interface);
2218
errno = old_errno;
2219
return ret_errno;
2220
}
2221
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2222
2223
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2224
if(sd == -1){
2225
ret_errno = errno;
2226
perror_plus("socket");
2227
errno = old_errno;
2228
return ret_errno;
2229
}
2230
2231
if(debug){
2232
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2233
interface);
2234
}
2235
2236
/* Raise privileges */
2237
ret_errno = raise_privileges();
2238
if(ret_errno != 0){
2239
errno = ret_errno;
2240
perror_plus("Failed to raise privileges");
2241
}
2242
2243
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2244
ioctl_errno = errno;
2245
2246
/* If raise_privileges() succeeded above */
2247
if(ret_errno == 0){
2248
/* Lower privileges */
2249
ret_errno = lower_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to lower privileges");
2253
}
2254
}
2255
2256
/* Close the socket */
2257
int ret = close(sd);
1675
2258
if(ret == -1){
1676
perror_plus("klogctl");
1677
}
2259
perror_plus("close");
2260
}
2261
2262
if(ret_setflags == -1){
2263
errno = ioctl_errno;
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
errno = old_errno;
2266
return ioctl_errno;
2267
}
2268
} else if(debug){
2269
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2270
interface);
1678
2271
}
1679
#endif /* __linux__ */
1680
/* Lower privileges */
1681
lower_privileges();
2272
1682
2273
errno = old_errno;
1683
2274
return 0;
1684
2275
}
1685
2276
1686
2277
int main(int argc, char *argv[]){
2278
mandos_context mc = { .server = NULL, .dh_bits = 0,
2279
.priority = "SECURE256:!CTYPE-X.509"
2280
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2281
.current_server = NULL, .interfaces = NULL,
2282
.interfaces_size = 0 };
1687
2283
AvahiSServiceBrowser *sb = NULL;
1688
int error;
2284
error_t ret_errno;
1689
2285
int ret;
1690
2286
intmax_t tmpmax;
1691
2287
char *tmp;
1692
2288
int exitcode = EXIT_SUCCESS;
1693
const char *interface = "";
1694
struct ifreq network;
1695
int sd = -1;
1696
bool take_down_interface = false;
1697
char tempdir[] = "/tmp/mandosXXXXXX";
1698
bool tempdir_created = false;
2289
char *interfaces_to_take_down = NULL;
2290
size_t interfaces_to_take_down_size = 0;
2291
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2292
char old_tempdir[] = "/tmp/mandosXXXXXX";
2293
char *tempdir = NULL;
1699
2294
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1700
2295
const char *seckey = PATHDIR "/" SECKEY;
1701
2296
const char *pubkey = PATHDIR "/" PUBKEY;
2297
const char *dh_params_file = NULL;
2298
char *interfaces_hooks = NULL;
1702
2299
1703
2300
bool gnutls_initialized = false;
1704
2301
bool gpgme_initialized = false;
1756
2353
.doc = "Bit length of the prime number used in the"
1757
2354
" Diffie-Hellman key exchange",
1758
2355
.group = 2 },
2356
{ .name = "dh-params", .key = 134,
2357
.arg = "FILE",
2358
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2359
" for the Diffie-Hellman key exchange",
2360
.group = 2 },
1759
2361
{ .name = "priority", .key = 130,
1760
2362
.arg = "STRING",
1761
2363
.doc = "GnuTLS priority string for the TLS handshake",
1795
2397
connect_to = arg;
1796
2398
break;
1797
2399
case 'i': /* --interface */
1798
interface = arg;
2400
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2401
arg, (int)',');
2402
if(ret_errno != 0){
2403
argp_error(state, "%s", strerror(ret_errno));
2404
}
1799
2405
break;
1800
2406
case 's': /* --seckey */
1801
2407
seckey = arg;
1812
2418
}
1813
2419
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1814
2420
break;
2421
case 134: /* --dh-params */
2422
dh_params_file = arg;
2423
break;
1815
2424
case 130: /* --priority */
1816
2425
mc.priority = arg;
1817
2426
break;
1857
2466
.args_doc = "",
1858
2467
.doc = "Mandos client -- Get and decrypt"
1859
2468
" passwords from a Mandos server" };
1860
ret = argp_parse(&argp, argc, argv,
1861
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1862
switch(ret){
2469
ret_errno = argp_parse(&argp, argc, argv,
2470
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2471
switch(ret_errno){
1863
2472
case 0:
1864
2473
break;
1865
2474
case ENOMEM:
1866
2475
default:
1867
errno = ret;
2476
errno = ret_errno;
1868
2477
perror_plus("argp_parse");
1869
2478
exitcode = EX_OSERR;
1870
2479
goto end;
1873
2482
goto end;
1874
2483
}
1875
2484
}
1876
2485
1877
2486
{
1878
2487
/* Work around Debian bug #633582:
1879
2488
<http://bugs.debian.org/633582> */
1880
2489
1881
/* Re-raise priviliges */
1882
if(raise_privileges() == 0){
2490
/* Re-raise privileges */
2491
ret = raise_privileges();
2492
if(ret != 0){
2493
errno = ret;
2494
perror_plus("Failed to raise privileges");
2495
} else {
1883
2496
struct stat st;
1884
2497
1885
2498
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1899
2512
}
1900
2513
}
1901
2514
}
1902
TEMP_FAILURE_RETRY(close(seckey_fd));
2515
close(seckey_fd);
1903
2516
}
1904
2517
}
1905
2518
1906
2519
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1907
2520
int pubkey_fd = open(pubkey, O_RDONLY);
1908
2521
if(pubkey_fd == -1){
1920
2533
}
1921
2534
}
1922
2535
}
1923
TEMP_FAILURE_RETRY(close(pubkey_fd));
1924
}
1925
}
1926
2536
close(pubkey_fd);
2537
}
2538
}
2539
2540
if(dh_params_file != NULL
2541
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2542
int dhparams_fd = open(dh_params_file, O_RDONLY);
2543
if(dhparams_fd == -1){
2544
perror_plus("open");
2545
} else {
2546
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2547
if(ret == -1){
2548
perror_plus("fstat");
2549
} else {
2550
if(S_ISREG(st.st_mode)
2551
and st.st_uid == 0 and st.st_gid == 0){
2552
ret = fchown(dhparams_fd, uid, gid);
2553
if(ret == -1){
2554
perror_plus("fchown");
2555
}
2556
}
2557
}
2558
close(dhparams_fd);
2559
}
2560
}
2561
1927
2562
/* Lower privileges */
1928
errno = 0;
1929
ret = seteuid(uid);
1930
if(ret == -1){
1931
perror_plus("seteuid");
2563
ret = lower_privileges();
2564
if(ret != 0){
2565
errno = ret;
2566
perror_plus("Failed to lower privileges");
2567
}
2568
}
2569
}
2570
2571
/* Remove invalid interface names (except "none") */
2572
{
2573
char *interface = NULL;
2574
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2575
interface))){
2576
if(strcmp(interface, "none") != 0
2577
and if_nametoindex(interface) == 0){
2578
if(interface[0] != '\0'){
2579
fprintf_plus(stderr, "Not using nonexisting interface"
2580
" \"%s\"\n", interface);
2581
}
2582
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2583
interface = NULL;
1932
2584
}
1933
2585
}
1934
2586
}
1935
2587
1936
2588
/* Run network hooks */
1937
if(not run_network_hooks("start", interface, delay)){
1938
goto end;
2589
{
2590
if(mc.interfaces != NULL){
2591
interfaces_hooks = malloc(mc.interfaces_size);
2592
if(interfaces_hooks == NULL){
2593
perror_plus("malloc");
2594
goto end;
2595
}
2596
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2597
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2598
}
2599
run_network_hooks("start", interfaces_hooks != NULL ?
2600
interfaces_hooks : "", delay);
1939
2601
}
1940
2602
1941
2603
if(not debug){
1942
2604
avahi_set_log_function(empty_log);
1943
2605
}
1944
2606
1945
if(interface[0] == '\0'){
1946
struct dirent **direntries;
1947
/* First look for interfaces that are up */
1948
ret = scandir(sys_class_net, &direntries, up_interface,
1949
alphasort);
1950
if(ret == 0){
1951
/* No up interfaces, look for any good interfaces */
1952
free(direntries);
1953
ret = scandir(sys_class_net, &direntries, good_interface,
1954
alphasort);
1955
}
1956
if(ret >= 1){
1957
/* Pick the first interface returned */
1958
interface = strdup(direntries[0]->d_name);
1959
if(debug){
1960
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1961
}
1962
if(interface == NULL){
1963
perror_plus("malloc");
1964
free(direntries);
1965
exitcode = EXIT_FAILURE;
1966
goto end;
1967
}
1968
free(direntries);
1969
} else {
1970
free(direntries);
1971
fprintf_plus(stderr, "Could not find a network interface\n");
1972
exitcode = EXIT_FAILURE;
1973
goto end;
1974
}
1975
}
1976
1977
2607
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1978
2608
from the signal handler */
1979
2609
/* Initialize the pseudo-RNG for Avahi */
1980
2610
srand((unsigned int) time(NULL));
1981
mc.simple_poll = avahi_simple_poll_new();
1982
if(mc.simple_poll == NULL){
2611
simple_poll = avahi_simple_poll_new();
2612
if(simple_poll == NULL){
1983
2613
fprintf_plus(stderr,
1984
2614
"Avahi: Failed to create simple poll object.\n");
1985
2615
exitcode = EX_UNAVAILABLE;
2049
2679
}
2050
2680
}
2051
2681
2052
/* If the interface is down, bring it up */
2053
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2054
ret = bring_up_interface(interface, delay);
2055
if(ret != 0){
2056
errno = ret;
2057
perror_plus("Failed to bring up interface");
2058
}
2682
/* If no interfaces were specified, make a list */
2683
if(mc.interfaces == NULL){
2684
struct dirent **direntries = NULL;
2685
/* Look for any good interfaces */
2686
ret = scandir(sys_class_net, &direntries, good_interface,
2687
alphasort);
2688
if(ret >= 1){
2689
/* Add all found interfaces to interfaces list */
2690
for(int i = 0; i < ret; ++i){
2691
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2692
direntries[i]->d_name);
2693
if(ret_errno != 0){
2694
errno = ret_errno;
2695
perror_plus("argz_add");
2696
free(direntries[i]);
2697
continue;
2698
}
2699
if(debug){
2700
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2701
direntries[i]->d_name);
2702
}
2703
free(direntries[i]);
2704
}
2705
free(direntries);
2706
} else {
2707
if(ret == 0){
2708
free(direntries);
2709
}
2710
fprintf_plus(stderr, "Could not find a network interface\n");
2711
exitcode = EXIT_FAILURE;
2712
goto end;
2713
}
2714
}
2715
2716
/* Bring up interfaces which are down, and remove any "none"s */
2717
{
2718
char *interface = NULL;
2719
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2720
interface))){
2721
/* If interface name is "none", stop bringing up interfaces.
2722
Also remove all instances of "none" from the list */
2723
if(strcmp(interface, "none") == 0){
2724
argz_delete(&mc.interfaces, &mc.interfaces_size,
2725
interface);
2726
interface = NULL;
2727
while((interface = argz_next(mc.interfaces,
2728
mc.interfaces_size, interface))){
2729
if(strcmp(interface, "none") == 0){
2730
argz_delete(&mc.interfaces, &mc.interfaces_size,
2731
interface);
2732
interface = NULL;
2733
}
2734
}
2735
break;
2736
}
2737
bool interface_was_up = interface_is_up(interface);
2738
errno = bring_up_interface(interface, delay);
2739
if(not interface_was_up){
2740
if(errno != 0){
2741
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2742
" %s\n", interface, strerror(errno));
2743
} else {
2744
errno = argz_add(&interfaces_to_take_down,
2745
&interfaces_to_take_down_size,
2746
interface);
2747
if(errno != 0){
2748
perror_plus("argz_add");
2749
}
2750
}
2751
}
2752
}
2753
if(debug and (interfaces_to_take_down == NULL)){
2754
fprintf_plus(stderr, "No interfaces were brought up\n");
2755
}
2756
}
2757
2758
/* If we only got one interface, explicitly use only that one */
2759
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2760
if(debug){
2761
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2762
mc.interfaces);
2763
}
2764
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2059
2765
}
2060
2766
2061
2767
if(quit_now){
2062
2768
goto end;
2063
2769
}
2064
2770
2065
ret = init_gnutls_global(pubkey, seckey);
2771
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2066
2772
if(ret == -1){
2067
2773
fprintf_plus(stderr, "init_gnutls_global failed\n");
2068
2774
exitcode = EX_UNAVAILABLE;
2075
2781
goto end;
2076
2782
}
2077
2783
2078
if(mkdtemp(tempdir) == NULL){
2784
/* Try /run/tmp before /tmp */
2785
tempdir = mkdtemp(run_tempdir);
2786
if(tempdir == NULL and errno == ENOENT){
2787
if(debug){
2788
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2789
run_tempdir, old_tempdir);
2790
}
2791
tempdir = mkdtemp(old_tempdir);
2792
}
2793
if(tempdir == NULL){
2079
2794
perror_plus("mkdtemp");
2080
2795
goto end;
2081
2796
}
2082
tempdir_created = true;
2083
2797
2084
2798
if(quit_now){
2085
2799
goto end;
2086
2800
}
2087
2801
2088
if(not init_gpgme(pubkey, seckey, tempdir)){
2802
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2089
2803
fprintf_plus(stderr, "init_gpgme failed\n");
2090
2804
exitcode = EX_UNAVAILABLE;
2091
2805
goto end;
2112
2826
goto end;
2113
2827
}
2114
2828
2115
uint16_t port;
2829
in_port_t port;
2116
2830
errno = 0;
2117
2831
tmpmax = strtoimax(address+1, &tmp, 10);
2118
2832
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2119
or tmpmax != (uint16_t)tmpmax){
2833
or tmpmax != (in_port_t)tmpmax){
2120
2834
fprintf_plus(stderr, "Bad port number\n");
2121
2835
exitcode = EX_USAGE;
2122
2836
goto end;
2123
2837
}
2124
2838
2125
2839
if(quit_now){
2126
2840
goto end;
2127
2841
}
2128
2842
2129
port = (uint16_t)tmpmax;
2843
port = (in_port_t)tmpmax;
2130
2844
*address = '\0';
2131
2845
/* Colon in address indicates IPv6 */
2132
2846
int af;
2148
2862
}
2149
2863
2150
2864
while(not quit_now){
2151
ret = start_mandos_communication(address, port, if_index, af);
2865
ret = start_mandos_communication(address, port, if_index, af,
2866
&mc);
2152
2867
if(quit_now or ret == 0){
2153
2868
break;
2154
2869
}
2156
2871
fprintf_plus(stderr, "Retrying in %d seconds\n",
2157
2872
(int)retry_interval);
2158
2873
}
2159
sleep((int)retry_interval);
2874
sleep((unsigned int)retry_interval);
2160
2875
}
2161
2876
2162
if (not quit_now){
2877
if(not quit_now){
2163
2878
exitcode = EXIT_SUCCESS;
2164
2879
}
2165
2880
2180
2895
config.publish_domain = 0;
2181
2896
2182
2897
/* Allocate a new server */
2183
mc.server = avahi_server_new(avahi_simple_poll_get
2184
(mc.simple_poll), &config, NULL,
2185
NULL, &error);
2898
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2899
&config, NULL, NULL, &ret);
2186
2900
2187
2901
/* Free the Avahi configuration data */
2188
2902
avahi_server_config_free(&config);
2191
2905
/* Check if creating the Avahi server object succeeded */
2192
2906
if(mc.server == NULL){
2193
2907
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2194
avahi_strerror(error));
2908
avahi_strerror(ret));
2195
2909
exitcode = EX_UNAVAILABLE;
2196
2910
goto end;
2197
2911
}
2203
2917
/* Create the Avahi service browser */
2204
2918
sb = avahi_s_service_browser_new(mc.server, if_index,
2205
2919
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2206
NULL, 0, browse_callback, NULL);
2920
NULL, 0, browse_callback,
2921
(void *)&mc);
2207
2922
if(sb == NULL){
2208
2923
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2209
2924
avahi_strerror(avahi_server_errno(mc.server)));
2220
2935
if(debug){
2221
2936
fprintf_plus(stderr, "Starting Avahi loop search\n");
2222
2937
}
2223
2224
ret = avahi_loop_with_timeout(mc.simple_poll,
2225
(int)(retry_interval * 1000));
2938
2939
ret = avahi_loop_with_timeout(simple_poll,
2940
(int)(retry_interval * 1000), &mc);
2226
2941
if(debug){
2227
2942
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2228
2943
(ret == 0) ? "successfully" : "with error");
2235
2950
}
2236
2951
2237
2952
/* Cleanup things */
2953
free(mc.interfaces);
2954
2238
2955
if(sb != NULL)
2239
2956
avahi_s_service_browser_free(sb);
2240
2957
2241
2958
if(mc.server != NULL)
2242
2959
avahi_server_free(mc.server);
2243
2960
2244
if(mc.simple_poll != NULL)
2245
avahi_simple_poll_free(mc.simple_poll);
2961
if(simple_poll != NULL)
2962
avahi_simple_poll_free(simple_poll);
2246
2963
2247
2964
if(gnutls_initialized){
2248
2965
gnutls_certificate_free_credentials(mc.cred);
2249
gnutls_global_deinit();
2250
2966
gnutls_dh_params_deinit(mc.dh_params);
2251
2967
}
2252
2968
2260
2976
mc.current_server->prev->next = NULL;
2261
2977
while(mc.current_server != NULL){
2262
2978
server *next = mc.current_server->next;
2979
#ifdef __GNUC__
2980
#pragma GCC diagnostic push
2981
#pragma GCC diagnostic ignored "-Wcast-qual"
2982
#endif
2983
free((char *)(mc.current_server->ip));
2984
#ifdef __GNUC__
2985
#pragma GCC diagnostic pop
2986
#endif
2263
2987
free(mc.current_server);
2264
2988
mc.current_server = next;
2265
2989
}
2266
2990
}
2267
2991
2268
/* Run network hooks */
2269
run_network_hooks("stop", interface, delay);
2270
2271
/* Re-raise priviliges */
2992
/* Re-raise privileges */
2272
2993
{
2273
raise_privileges();
2994
ret = raise_privileges();
2995
if(ret != 0){
2996
errno = ret;
2997
perror_plus("Failed to raise privileges");
2998
} else {
2999
3000
/* Run network hooks */
3001
run_network_hooks("stop", interfaces_hooks != NULL ?
3002
interfaces_hooks : "", delay);
3003
3004
/* Take down the network interfaces which were brought up */
3005
{
3006
char *interface = NULL;
3007
while((interface=argz_next(interfaces_to_take_down,
3008
interfaces_to_take_down_size,
3009
interface))){
3010
ret = take_down_interface(interface);
3011
if(ret != 0){
3012
errno = ret;
3013
perror_plus("Failed to take down interface");
3014
}
3015
}
3016
if(debug and (interfaces_to_take_down == NULL)){
3017
fprintf_plus(stderr, "No interfaces needed to be taken"
3018
" down\n");
3019
}
3020
}
3021
}
2274
3022
2275
/* Take down the network interface */
2276
if(take_down_interface and geteuid() == 0){
2277
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2278
if(ret == -1){
2279
perror_plus("ioctl SIOCGIFFLAGS");
2280
} else if(network.ifr_flags & IFF_UP){
2281
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2282
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2283
if(ret == -1){
2284
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2285
}
2286
}
2287
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2288
if(ret == -1){
2289
perror_plus("close");
2290
}
3023
ret = lower_privileges_permanently();
3024
if(ret != 0){
3025
errno = ret;
3026
perror_plus("Failed to lower privileges permanently");
2291
3027
}
2292
3028
}
2293
/* Lower privileges permanently */
2294
errno = 0;
2295
ret = setuid(uid);
2296
if(ret == -1){
2297
perror_plus("setuid");
3029
3030
free(interfaces_to_take_down);
3031
free(interfaces_hooks);
3032
3033
void clean_dir_at(int base, const char * const dirname,
3034
uintmax_t level){
3035
struct dirent **direntries = NULL;
3036
int dret;
3037
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3038
O_RDONLY
3039
| O_NOFOLLOW
3040
| O_DIRECTORY
3041
| O_PATH));
3042
if(dir_fd == -1){
3043
perror_plus("open");
3044
}
3045
int numentries = scandirat(dir_fd, ".", &direntries,
3046
notdotentries, alphasort);
3047
if(numentries >= 0){
3048
for(int i = 0; i < numentries; i++){
3049
if(debug){
3050
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3051
dirname, direntries[i]->d_name);
3052
}
3053
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3054
if(dret == -1){
3055
if(errno == EISDIR){
3056
dret = unlinkat(dir_fd, direntries[i]->d_name,
3057
AT_REMOVEDIR);
3058
}
3059
if((dret == -1) and (errno == ENOTEMPTY)
3060
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3061
== 0) and (level == 0)){
3062
/* Recurse only in this special case */
3063
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3064
dret = 0;
3065
}
3066
if(dret == -1){
3067
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3068
direntries[i]->d_name, strerror(errno));
3069
}
3070
}
3071
free(direntries[i]);
3072
}
3073
3074
/* need to clean even if 0 because man page doesn't specify */
3075
free(direntries);
3076
if(numentries == -1){
3077
perror_plus("scandirat");
3078
}
3079
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3080
if(dret == -1 and errno != ENOENT){
3081
perror_plus("rmdir");
3082
}
3083
} else {
3084
perror_plus("scandirat");
3085
}
3086
close(dir_fd);
2298
3087
}
2299
3088
2300
3089
/* Removes the GPGME temp directory and all files inside */
2301
if(tempdir_created){
2302
struct dirent **direntries = NULL;
2303
struct dirent *direntry = NULL;
2304
int numentries = scandir(tempdir, &direntries, notdotentries,
2305
alphasort);
2306
if (numentries > 0){
2307
for(int i = 0; i < numentries; i++){
2308
direntry = direntries[i];
2309
char *fullname = NULL;
2310
ret = asprintf(&fullname, "%s/%s", tempdir,
2311
direntry->d_name);
2312
if(ret < 0){
2313
perror_plus("asprintf");
2314
continue;
2315
}
2316
ret = remove(fullname);
2317
if(ret == -1){
2318
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2319
strerror(errno));
2320
}
2321
free(fullname);
2322
}
2323
}
2324
2325
/* need to clean even if 0 because man page doesn't specify */
2326
free(direntries);
2327
if (numentries == -1){
2328
perror_plus("scandir");
2329
}
2330
ret = rmdir(tempdir);
2331
if(ret == -1 and errno != ENOENT){
2332
perror_plus("rmdir");
2333
}
3090
if(tempdir != NULL){
3091
clean_dir_at(-1, tempdir, 0);
2334
3092
}
2335
3093
2336
3094
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0