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- Committer: Teddy Hogeborn
- Date: 2012-06-01 21:48:12 UTC
- Revision ID: teddy@recompile.se-20120601214812-g7685v5oeiuhi2qw
* debian/copyright (Copyright): Join the two lines to one line.
* debian/mandos-client.README.Debian: Refer to new location of example
network hooks.
* debian/mandos-client.docs (network-hooks.d): Removed.
* debian/mandos-client.examples: New; contains "network-hooks.d".
* debian/rules (binary-common): Added "dh_installexamples".
(binary-common/dh_fixperms): Changed to exclude new location of
"network-hooks.d".
* init.d-mandos (status): Support new "status" action.
* debian/mandos-client.README.Debian: Refer to new location of example
network hooks.
* debian/mandos-client.docs (network-hooks.d): Removed.
* debian/mandos-client.examples: New; contains "network-hooks.d".
* debian/rules (binary-common): Added "dh_installexamples".
(binary-common/dh_fixperms): Changed to exclude new location of
"network-hooks.d".
* init.d-mandos (status): Support new "status" action.
- files removed:
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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 /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
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> /* strcmp(), strlen(), strerror(),
50
asprintf(), strcpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
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
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
90
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
91
99
92
#ifdef __linux__
100
93
#include <sys/klog.h> /* klogctl() */
142
135
static const char sys_class_net[] = "/sys/class/net";
143
136
char *connect_to = NULL;
144
137
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
138
149
139
/* Doubly linked list that need to be circularly linked when used */
150
140
typedef struct server{
151
141
const char *ip;
152
in_port_t port;
142
uint16_t port;
153
143
AvahiIfIndex if_index;
154
144
int af;
155
145
struct timespec last_seen;
159
149
160
150
/* Used for passing in values through the Avahi callback functions */
161
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
162
153
AvahiServer *server;
163
154
gnutls_certificate_credentials_t cred;
164
155
unsigned int dh_bits;
166
157
const char *priority;
167
158
gpgme_ctx_t ctx;
168
159
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
160
} mandos_context;
172
161
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
175
167
176
168
sig_atomic_t quit_now = 0;
177
169
int signal_received = 0;
185
177
perror(print_text);
186
178
}
187
179
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
180
__attribute__((format (gnu_printf, 2, 3)))
189
181
int fprintf_plus(FILE *stream, const char *format, ...){
190
182
va_list ap;
191
183
va_start (ap, format);
192
184
193
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
186
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
188
}
197
189
198
190
/*
200
192
* bytes. "buffer_capacity" is how much is currently allocated,
201
193
* "buffer_length" is how much is already used.
202
194
*/
203
__attribute__((nonnull, warn_unused_result))
204
195
size_t incbuffer(char **buffer, size_t buffer_length,
205
196
size_t buffer_capacity){
206
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
213
200
return 0;
214
201
}
215
*buffer = new_buf;
216
202
buffer_capacity += BUFFER_SIZE;
217
203
}
218
204
return buffer_capacity;
219
205
}
220
206
221
207
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
225
210
int ret;
226
211
server *new_server = malloc(sizeof(server));
227
212
if(new_server == NULL){
234
219
.af = af };
235
220
if(new_server->ip == NULL){
236
221
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
222
return false;
253
223
}
254
224
/* Special case of first server */
255
if(*current_server == NULL){
225
if (mc.current_server == NULL){
256
226
new_server->next = new_server;
257
227
new_server->prev = new_server;
258
*current_server = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
259
230
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
263
233
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
265
240
}
266
241
return true;
267
242
}
269
244
/*
270
245
* Initialize GPGME.
271
246
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
277
249
gpgme_error_t rc;
278
250
gpgme_engine_info_t engine_info;
279
251
252
280
253
/*
281
254
* Helper function to insert pub and seckey to the engine keyring.
282
255
*/
283
bool import_key(const char * const filename){
256
bool import_key(const char *filename){
284
257
int ret;
285
258
int fd;
286
259
gpgme_data_t pgp_data;
298
271
return false;
299
272
}
300
273
301
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
302
275
if(rc != GPG_ERR_NO_ERROR){
303
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
277
gpgme_strsource(rc), gpgme_strerror(rc));
305
278
return false;
306
279
}
307
280
308
ret = close(fd);
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
282
if(ret == -1){
310
283
perror_plus("close");
311
284
}
348
321
}
349
322
350
323
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
352
325
if(rc != GPG_ERR_NO_ERROR){
353
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
340
* Decrypt OpenPGP data.
368
341
* Returns -1 on error
369
342
*/
370
__attribute__((nonnull, warn_unused_result))
371
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
344
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
345
char **plaintext){
375
346
gpgme_data_t dh_crypto, dh_plain;
376
347
gpgme_error_t rc;
377
348
ssize_t ret;
403
374
404
375
/* Decrypt data from the cryptotext data buffer to the plaintext
405
376
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
378
if(rc != GPG_ERR_NO_ERROR){
408
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
380
gpgme_strsource(rc), gpgme_strerror(rc));
410
381
plaintext_length = -1;
411
382
if(debug){
412
383
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
414
385
if(result == NULL){
415
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
387
} else {
493
464
return plaintext_length;
494
465
}
495
466
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
507
473
}
508
474
509
475
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
476
static void debuggnutls(__attribute__((unused)) int level,
512
477
const char* string){
513
478
fprintf_plus(stderr, "GnuTLS: %s", string);
514
479
}
515
480
516
__attribute__((nonnull, warn_unused_result))
517
481
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
482
const char *seckeyfilename){
521
483
int ret;
522
unsigned int uret;
523
484
524
485
if(debug){
525
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
541
502
}
542
503
543
504
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
545
506
if(ret != GNUTLS_E_SUCCESS){
546
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
508
safer_gnutls_strerror(ret));
557
518
}
558
519
559
520
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
561
522
GNUTLS_OPENPGP_FMT_BASE64);
562
523
if(ret != GNUTLS_E_SUCCESS){
563
524
fprintf_plus(stderr,
569
530
}
570
531
571
532
/* GnuTLS server initialization */
572
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
573
534
if(ret != GNUTLS_E_SUCCESS){
574
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
536
" initialization: %s\n",
576
537
safer_gnutls_strerror(ret));
577
538
goto globalfail;
578
539
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
752
548
753
549
return 0;
754
550
755
551
globalfail:
756
552
757
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
758
554
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
760
556
return -1;
761
557
}
762
558
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
766
560
int ret;
767
561
/* GnuTLS session creation */
768
562
do {
780
574
{
781
575
const char *err;
782
576
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
784
578
if(quit_now){
785
579
gnutls_deinit(*session);
786
580
return -1;
797
591
798
592
do {
799
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
594
mc.cred);
801
595
if(quit_now){
802
596
gnutls_deinit(*session);
803
597
return -1;
813
607
/* ignore client certificate if any. */
814
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
609
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
816
612
return 0;
817
613
}
818
614
820
616
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
617
__attribute__((unused)) const char *txt){}
822
618
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = close(devnull);
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
958
}
959
close(helperdir_fd);
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
1040
619
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
620
static int start_mandos_communication(const char *ip, uint16_t port,
1043
621
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
622
int af){
1045
623
int ret, tcp_sd = -1;
1046
624
ssize_t sret;
1047
struct sockaddr_storage to;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1048
629
char *buffer = NULL;
1049
630
char *decrypted_buffer = NULL;
1050
631
size_t buffer_length = 0;
1053
634
int retval = -1;
1054
635
gnutls_session_t session;
1055
636
int pf; /* Protocol family */
1056
bool route_added = false;
1057
637
1058
638
errno = 0;
1059
639
1075
655
return -1;
1076
656
}
1077
657
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
658
ret = init_gnutls_session(&session);
1111
659
if(ret != 0){
1112
660
return -1;
1113
661
}
1114
662
1115
663
if(debug){
1116
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
1118
666
}
1119
667
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
669
if(tcp_sd < 0){
1122
670
int e = errno;
1123
671
perror_plus("socket");
1130
678
goto mandos_end;
1131
679
}
1132
680
681
memset(&to, 0, sizeof(to));
1133
682
if(af == AF_INET6){
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1137
685
} else { /* IPv4 */
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
1141
688
}
1142
689
if(ret < 0 ){
1143
690
int e = errno;
1152
699
goto mandos_end;
1153
700
}
1154
701
if(af == AF_INET6){
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
1158
709
if(if_index == AVAHI_IF_UNSPEC){
1159
710
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
711
" incomplete without a network interface\n");
1162
713
goto mandos_end;
1163
714
}
1164
715
/* Set the network interface number as scope */
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
717
}
1167
718
} else {
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1169
722
}
1170
723
1171
724
if(quit_now){
1179
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1180
733
perror_plus("if_indextoname");
1181
734
} else {
1182
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1183
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1184
737
}
1185
738
} else {
1186
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1187
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1188
741
}
1189
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1190
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1191
if(af == AF_INET6){
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1195
NI_NUMERICHOST);
1196
} else {
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1200
NI_NUMERICHOST);
1201
}
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1208
}
1209
}
1210
1211
if(quit_now){
1212
errno = EINTR;
1213
goto mandos_end;
1214
}
1215
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(errno == ENETUNREACH
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
758
}
759
}
760
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
1271
783
}
1272
784
1273
785
const char *out = mandos_protocol_version;
1424
936
if(buffer_length > 0){
1425
937
ssize_t decrypted_buffer_size;
1426
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1427
&decrypted_buffer, mc);
939
&decrypted_buffer);
1428
940
if(decrypted_buffer_size >= 0){
1429
941
1430
942
written = 0;
1456
968
1457
969
mandos_end:
1458
970
{
1459
if(route_added){
1460
if(not delete_local_route(ip, if_index)){
1461
fprintf_plus(stderr, "Failed to delete local route to %s on"
1462
" interface %d", ip, if_index);
1463
}
1464
}
1465
971
int e = errno;
1466
972
free(decrypted_buffer);
1467
973
free(buffer);
1468
974
if(tcp_sd >= 0){
1469
ret = close(tcp_sd);
975
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1470
976
}
1471
977
if(ret == -1){
1472
978
if(e == 0){
1484
990
return retval;
1485
991
}
1486
992
1487
__attribute__((nonnull))
1488
993
static void resolve_callback(AvahiSServiceResolver *r,
1489
994
AvahiIfIndex interface,
1490
995
AvahiProtocol proto,
1498
1003
AVAHI_GCC_UNUSED AvahiStringList *txt,
1499
1004
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1500
1005
flags,
1501
void *mc){
1502
if(r == NULL){
1503
return;
1504
}
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1505
1008
1506
1009
/* Called whenever a service has been resolved successfully or
1507
1010
timed out */
1508
1011
1509
1012
if(quit_now){
1510
avahi_s_service_resolver_free(r);
1511
1013
return;
1512
1014
}
1513
1015
1517
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1518
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1519
1021
domain,
1520
avahi_strerror(avahi_server_errno
1521
(((mandos_context*)mc)->server)));
1022
avahi_strerror(avahi_server_errno(mc.server)));
1522
1023
break;
1523
1024
1524
1025
case AVAHI_RESOLVER_FOUND:
1530
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1531
1032
host_name, ip, (intmax_t)interface, port);
1532
1033
}
1533
int ret = start_mandos_communication(ip, (in_port_t)port,
1534
interface,
1535
avahi_proto_to_af(proto),
1536
mc);
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1537
1036
if(ret == 0){
1538
avahi_simple_poll_quit(simple_poll);
1037
avahi_simple_poll_quit(mc.simple_poll);
1539
1038
} else {
1540
if(not add_server(ip, (in_port_t)port, interface,
1541
avahi_proto_to_af(proto),
1542
&((mandos_context*)mc)->current_server)){
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1543
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1544
1042
" list\n", name);
1545
1043
}
1558
1056
const char *domain,
1559
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1560
1058
flags,
1561
void *mc){
1562
if(b == NULL){
1563
return;
1564
}
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1565
1061
1566
1062
/* Called whenever a new services becomes available on the LAN or
1567
1063
is removed from the LAN */
1575
1071
case AVAHI_BROWSER_FAILURE:
1576
1072
1577
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1578
avahi_strerror(avahi_server_errno
1579
(((mandos_context*)mc)->server)));
1580
avahi_simple_poll_quit(simple_poll);
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1581
1076
return;
1582
1077
1583
1078
case AVAHI_BROWSER_NEW:
1586
1081
the callback function is called the Avahi server will free the
1587
1082
resolver for us. */
1588
1083
1589
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1590
interface, protocol, name, type,
1591
domain, protocol, 0,
1592
resolve_callback, mc) == NULL)
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1593
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1594
1088
" %s\n", name,
1595
avahi_strerror(avahi_server_errno
1596
(((mandos_context*)mc)->server)));
1089
avahi_strerror(avahi_server_errno(mc.server)));
1597
1090
break;
1598
1091
1599
1092
case AVAHI_BROWSER_REMOVE:
1618
1111
signal_received = sig;
1619
1112
int old_errno = errno;
1620
1113
/* set main loop to exit */
1621
if(simple_poll != NULL){
1622
avahi_simple_poll_quit(simple_poll);
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1623
1116
}
1624
1117
errno = old_errno;
1625
1118
}
1626
1119
1627
__attribute__((nonnull, warn_unused_result))
1628
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1629
1121
int ret;
1630
error_t ret_errno;
1631
1122
1632
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1633
1124
if(s < 0){
1634
ret_errno = errno;
1635
1125
perror_plus("socket");
1636
errno = ret_errno;
1637
1126
return false;
1638
1127
}
1639
1128
strcpy(ifr->ifr_name, ifname);
1640
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1641
1130
if(ret == -1){
1642
1131
if(debug){
1643
ret_errno = errno;
1644
1132
perror_plus("ioctl SIOCGIFFLAGS");
1645
errno = ret_errno;
1646
1133
}
1647
1134
return false;
1648
1135
}
1649
1136
return true;
1650
1137
}
1651
1138
1652
__attribute__((nonnull, warn_unused_result))
1653
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1654
1140
1655
1141
/* Reject the loopback device */
1697
1183
* corresponds to an acceptable network device.
1698
1184
* (This function is passed to scandir(3) as a filter function.)
1699
1185
*/
1700
__attribute__((nonnull, warn_unused_result))
1701
1186
int good_interface(const struct dirent *if_entry){
1702
1187
if(if_entry->d_name[0] == '.'){
1703
1188
return 0;
1719
1204
}
1720
1205
1721
1206
/*
1722
* This function determines if a network interface is up.
1723
*/
1724
__attribute__((nonnull, warn_unused_result))
1725
bool interface_is_up(const char *interface){
1726
struct ifreq ifr;
1727
if(not get_flags(interface, &ifr)){
1728
if(debug){
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1731
}
1732
return false;
1733
}
1734
1735
return (bool)(ifr.ifr_flags & IFF_UP);
1736
}
1737
1738
/*
1739
* This function determines if a network interface is running
1740
*/
1741
__attribute__((nonnull, warn_unused_result))
1742
bool interface_is_running(const char *interface){
1743
struct ifreq ifr;
1744
if(not get_flags(interface, &ifr)){
1745
if(debug){
1746
fprintf_plus(stderr, "Failed to get flags for interface "
1747
"\"%s\"\n", interface);
1748
}
1749
return false;
1750
}
1751
1752
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1753
}
1754
1755
__attribute__((nonnull, pure, warn_unused_result))
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1756
1249
int notdotentries(const struct dirent *direntry){
1757
1250
/* Skip "." and ".." */
1758
1251
if(direntry->d_name[0] == '.'
1765
1258
}
1766
1259
1767
1260
/* Is this directory entry a runnable program? */
1768
__attribute__((nonnull, warn_unused_result))
1769
1261
int runnable_hook(const struct dirent *direntry){
1770
1262
int ret;
1771
1263
size_t sret;
1779
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1780
1272
"abcdefghijklmnopqrstuvwxyz"
1781
1273
"0123456789"
1782
"_.-");
1274
"_-");
1783
1275
if((direntry->d_name)[sret] != '\0'){
1784
1276
/* Contains non-allowed characters */
1785
1277
if(debug){
1789
1281
return 0;
1790
1282
}
1791
1283
1792
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1793
1292
if(ret == -1){
1794
1293
if(debug){
1795
1294
perror_plus("Could not stat hook");
1819
1318
return 1;
1820
1319
}
1821
1320
1822
__attribute__((nonnull, warn_unused_result))
1823
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1824
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1825
1322
int ret;
1826
1323
struct timespec now;
1827
1324
struct timespec waited_time;
1828
1325
intmax_t block_time;
1829
1326
1830
1327
while(true){
1831
if(mc->current_server == NULL){
1832
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
1833
1330
fprintf_plus(stderr, "Wait until first server is found."
1834
1331
" No timeout!\n");
1835
1332
}
1836
1333
ret = avahi_simple_poll_iterate(s, -1);
1837
1334
} else {
1838
if(debug){
1335
if (debug){
1839
1336
fprintf_plus(stderr, "Check current_server if we should run"
1840
1337
" it, or wait\n");
1841
1338
}
1848
1345
/* Calculating in ms how long time between now and server
1849
1346
who we visted longest time ago. Now - last seen. */
1850
1347
waited_time.tv_sec = (now.tv_sec
1851
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1852
1349
waited_time.tv_nsec = (now.tv_nsec
1853
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1854
1351
/* total time is 10s/10,000ms.
1855
1352
Converting to s from ms by dividing by 1,000,
1856
1353
and ns to ms by dividing by 1,000,000. */
1858
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1859
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1860
1357
1861
if(debug){
1358
if (debug){
1862
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1863
1360
block_time);
1864
1361
}
1865
1362
1866
1363
if(block_time <= 0){
1867
ret = start_mandos_communication(mc->current_server->ip,
1868
mc->current_server->port,
1869
mc->current_server->if_index,
1870
mc->current_server->af, mc);
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1871
1368
if(ret == 0){
1872
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1873
1370
return 0;
1874
1371
}
1875
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1876
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1877
1374
if(ret == -1){
1878
1375
perror_plus("clock_gettime");
1879
1376
return -1;
1880
1377
}
1881
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1882
1379
block_time = 0; /* Call avahi to find new Mandos
1883
1380
servers, but don't block */
1884
1381
}
1886
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1887
1384
}
1888
1385
if(ret != 0){
1889
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
1890
1387
return (ret != 1) ? ret : 0;
1891
1388
}
1892
1389
}
1893
1390
}
1894
1391
}
1895
1392
1896
__attribute__((nonnull))
1897
void run_network_hooks(const char *mode, const char *interface,
1393
bool run_network_hooks(const char *mode, const char *interface,
1898
1394
const float delay){
1899
struct dirent **direntries = NULL;
1900
if(hookdir_fd == -1){
1901
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1902
| O_CLOEXEC);
1903
if(hookdir_fd == -1){
1904
if(errno == ENOENT){
1905
if(debug){
1906
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1907
" found\n", hookdir);
1908
}
1909
} else {
1910
perror_plus("open");
1911
}
1912
return;
1913
}
1914
}
1915
#ifdef __GLIBC__
1916
#if __GLIBC_PREREQ(2, 15)
1917
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1918
runnable_hook, alphasort);
1919
#else /* not __GLIBC_PREREQ(2, 15) */
1920
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1921
alphasort);
1922
#endif /* not __GLIBC_PREREQ(2, 15) */
1923
#else /* not __GLIBC__ */
1924
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1925
alphasort);
1926
#endif /* not __GLIBC__ */
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1927
1400
if(numhooks == -1){
1928
1401
perror_plus("scandir");
1929
return;
1930
}
1931
struct dirent *direntry;
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1940
if(debug){
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
direntry->d_name);
1943
}
1944
pid_t hook_pid = fork();
1945
if(hook_pid == 0){
1946
/* Child */
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1949
if(errno != 0){
1950
perror_plus("Failed to raise privileges");
1951
_exit(EX_NOPERM);
1952
}
1953
/* Set group */
1954
errno = 0;
1955
ret = setgid(0);
1956
if(ret == -1){
1957
perror_plus("setgid");
1958
_exit(EX_NOPERM);
1959
}
1960
/* Reset supplementary groups */
1961
errno = 0;
1962
ret = setgroups(0, NULL);
1963
if(ret == -1){
1964
perror_plus("setgroups");
1965
_exit(EX_NOPERM);
1966
}
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
if(ret == -1){
1969
perror_plus("setenv");
1970
_exit(EX_OSERR);
1971
}
1972
ret = setenv("DEVICE", interface, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("MODE", mode, 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
char *delaystring;
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1989
if(ret == -1){
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1990
1409
perror_plus("asprintf");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1995
1478
free(delaystring);
1996
perror_plus("setenv");
1997
_exit(EX_OSERR);
1998
}
1999
free(delaystring);
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2002
if(ret == -1){
2003
perror_plus("setenv");
2004
_exit(EX_OSERR);
2005
}
2006
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
2010
if(hook_fd == -1){
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2013
}
2014
if(close(hookdir_fd) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2017
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = close(devnull);
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
environ) == -1){
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2037
}
2038
} else {
2039
if(hook_pid == -1){
2040
perror_plus("fork");
2041
free(direntry);
2042
continue;
2043
}
2044
int status;
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2047
free(direntry);
2048
continue;
2049
}
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2055
free(direntry);
2056
continue;
2057
}
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2061
WTERMSIG(status));
2062
free(direntry);
2063
continue;
2064
} else {
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2067
free(direntry);
2068
continue;
2069
}
2070
}
2071
if(debug){
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2073
direntry->d_name);
2074
}
2075
free(direntry);
2076
}
2077
free(direntries);
2078
if(close(hookdir_fd) == -1){
2079
perror_plus("close");
2080
} else {
2081
hookdir_fd = -1;
2082
}
2083
close(devnull);
2084
}
2085
2086
__attribute__((nonnull, warn_unused_result))
2087
error_t bring_up_interface(const char *const interface,
2088
const float delay){
2089
error_t old_errno = errno;
2090
int ret;
2091
struct ifreq network;
2092
unsigned int if_index = if_nametoindex(interface);
2093
if(if_index == 0){
2094
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2095
errno = old_errno;
2096
return ENXIO;
2097
}
2098
2099
if(quit_now){
2100
errno = old_errno;
2101
return EINTR;
2102
}
2103
2104
if(not interface_is_up(interface)){
2105
error_t ret_errno = 0, ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
2107
ret_errno = errno;
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2109
"\"%s\"\n", interface);
2110
errno = old_errno;
2111
return ret_errno;
2112
}
2113
network.ifr_flags |= IFF_UP; /* set flag */
2114
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2116
if(sd == -1){
2117
ret_errno = errno;
2118
perror_plus("socket");
2119
errno = old_errno;
2120
return ret_errno;
2121
}
2122
2123
if(quit_now){
2124
ret = close(sd);
2125
if(ret == -1){
2126
perror_plus("close");
2127
}
2128
errno = old_errno;
2129
return EINTR;
2130
}
2131
2132
if(debug){
2133
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2134
interface);
2135
}
2136
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to raise privileges");
2142
}
2143
2144
#ifdef __linux__
2145
int ret_linux;
2146
bool restore_loglevel = false;
2147
if(ret_errno == 0){
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2153
} else {
2154
restore_loglevel = true;
2155
}
2156
}
2157
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
2160
#ifdef __linux__
2161
if(restore_loglevel){
2162
ret_linux = klogctl(7, NULL, 0);
2163
if(ret_linux == -1){
2164
perror_plus("klogctl");
2165
}
2166
}
2167
#endif /* __linux__ */
2168
2169
/* If raise_privileges() succeeded above */
2170
if(ret_errno == 0){
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("Failed to lower privileges");
2176
}
2177
}
2178
2179
/* Close the socket */
2180
ret = close(sd);
2181
if(ret == -1){
2182
perror_plus("close");
2183
}
2184
2185
if(ret_setflags == -1){
2186
errno = ioctl_errno;
2187
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2188
errno = old_errno;
2189
return ioctl_errno;
2190
}
2191
} else if(debug){
2192
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2193
interface);
2194
}
2195
2196
/* Sleep checking until interface is running.
2197
Check every 0.25s, up to total time of delay */
2198
for(int i=0; i < delay * 4; i++){
2199
if(interface_is_running(interface)){
2200
break;
2201
}
2202
struct timespec sleeptime = { .tv_nsec = 250000000 };
2203
ret = nanosleep(&sleeptime, NULL);
2204
if(ret == -1 and errno != EINTR){
2205
perror_plus("nanosleep");
2206
}
2207
}
2208
2209
errno = old_errno;
2210
return 0;
2211
}
2212
2213
__attribute__((nonnull, warn_unused_result))
2214
error_t take_down_interface(const char *const interface){
2215
error_t old_errno = errno;
2216
struct ifreq network;
2217
unsigned int if_index = if_nametoindex(interface);
2218
if(if_index == 0){
2219
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2220
errno = old_errno;
2221
return ENXIO;
2222
}
2223
if(interface_is_up(interface)){
2224
error_t ret_errno = 0, ioctl_errno = 0;
2225
if(not get_flags(interface, &network) and debug){
2226
ret_errno = errno;
2227
fprintf_plus(stderr, "Failed to get flags for interface "
2228
"\"%s\"\n", interface);
2229
errno = old_errno;
2230
return ret_errno;
2231
}
2232
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2233
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2235
if(sd == -1){
2236
ret_errno = errno;
2237
perror_plus("socket");
2238
errno = old_errno;
2239
return ret_errno;
2240
}
2241
2242
if(debug){
2243
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2244
interface);
2245
}
2246
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("Failed to raise privileges");
2252
}
2253
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2256
2257
/* If raise_privileges() succeeded above */
2258
if(ret_errno == 0){
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2261
if(ret_errno != 0){
2262
errno = ret_errno;
2263
perror_plus("Failed to lower privileges");
2264
}
2265
}
2266
2267
/* Close the socket */
2268
int ret = close(sd);
2269
if(ret == -1){
2270
perror_plus("close");
2271
}
2272
2273
if(ret_setflags == -1){
2274
errno = ioctl_errno;
2275
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2276
errno = old_errno;
2277
return ioctl_errno;
2278
}
2279
} else if(debug){
2280
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2281
interface);
2282
}
2283
2284
errno = old_errno;
2285
return 0;
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
2286
1527
}
2287
1528
2288
1529
int main(int argc, char *argv[]){
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509:"
2291
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2292
.interfaces = NULL, .interfaces_size = 0 };
2293
1530
AvahiSServiceBrowser *sb = NULL;
2294
error_t ret_errno;
1531
int error;
2295
1532
int ret;
2296
1533
intmax_t tmpmax;
2297
1534
char *tmp;
2298
1535
int exitcode = EXIT_SUCCESS;
2299
char *interfaces_to_take_down = NULL;
2300
size_t interfaces_to_take_down_size = 0;
2301
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2302
char old_tempdir[] = "/tmp/mandosXXXXXX";
2303
char *tempdir = NULL;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1543
bool tempdir_created = false;
2304
1544
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2305
1545
const char *seckey = PATHDIR "/" SECKEY;
2306
1546
const char *pubkey = PATHDIR "/" PUBKEY;
2307
const char *dh_params_file = NULL;
2308
char *interfaces_hooks = NULL;
2309
1547
2310
1548
bool gnutls_initialized = false;
2311
1549
bool gpgme_initialized = false;
2363
1601
.doc = "Bit length of the prime number used in the"
2364
1602
" Diffie-Hellman key exchange",
2365
1603
.group = 2 },
2366
{ .name = "dh-params", .key = 134,
2367
.arg = "FILE",
2368
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2369
" for the Diffie-Hellman key exchange",
2370
.group = 2 },
2371
1604
{ .name = "priority", .key = 130,
2372
1605
.arg = "STRING",
2373
1606
.doc = "GnuTLS priority string for the TLS handshake",
2407
1640
connect_to = arg;
2408
1641
break;
2409
1642
case 'i': /* --interface */
2410
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2411
arg, (int)',');
2412
if(ret_errno != 0){
2413
argp_error(state, "%s", strerror(ret_errno));
2414
}
1643
interface = arg;
2415
1644
break;
2416
1645
case 's': /* --seckey */
2417
1646
seckey = arg;
2428
1657
}
2429
1658
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2430
1659
break;
2431
case 134: /* --dh-params */
2432
dh_params_file = arg;
2433
break;
2434
1660
case 130: /* --priority */
2435
1661
mc.priority = arg;
2436
1662
break;
2492
1718
goto end;
2493
1719
}
2494
1720
}
2495
1721
2496
1722
{
2497
1723
/* Work around Debian bug #633582:
2498
1724
<http://bugs.debian.org/633582> */
2499
1725
2500
/* Re-raise privileges */
2501
ret_errno = raise_privileges();
2502
if(ret_errno != 0){
2503
errno = ret_errno;
2504
perror_plus("Failed to raise privileges");
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2505
1731
} else {
2506
1732
struct stat st;
2507
1733
2522
1748
}
2523
1749
}
2524
1750
}
2525
close(seckey_fd);
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
2526
1752
}
2527
1753
}
2528
1754
2529
1755
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2530
1756
int pubkey_fd = open(pubkey, O_RDONLY);
2531
1757
if(pubkey_fd == -1){
2543
1769
}
2544
1770
}
2545
1771
}
2546
close(pubkey_fd);
2547
}
2548
}
2549
2550
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2551
int dhparams_fd = open(dh_params_file, O_RDONLY);
2552
if(dhparams_fd == -1){
2553
perror_plus("open");
2554
} else {
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2556
if(ret == -1){
2557
perror_plus("fstat");
2558
} else {
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(dhparams_fd, uid, gid);
2562
if(ret == -1){
2563
perror_plus("fchown");
2564
}
2565
}
2566
}
2567
close(dhparams_fd);
2568
}
2569
}
2570
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
}
1774
}
1775
2571
1776
/* Lower privileges */
2572
ret_errno = lower_privileges();
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to lower privileges");
2576
}
2577
}
2578
}
2579
2580
/* Remove invalid interface names (except "none") */
2581
{
2582
char *interface = NULL;
2583
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2584
interface))){
2585
if(strcmp(interface, "none") != 0
2586
and if_nametoindex(interface) == 0){
2587
if(interface[0] != '\0'){
2588
fprintf_plus(stderr, "Not using nonexisting interface"
2589
" \"%s\"\n", interface);
2590
}
2591
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2592
interface = NULL;
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2593
1781
}
2594
1782
}
2595
1783
}
2596
1784
2597
1785
/* Run network hooks */
2598
{
2599
if(mc.interfaces != NULL){
2600
interfaces_hooks = malloc(mc.interfaces_size);
2601
if(interfaces_hooks == NULL){
2602
perror_plus("malloc");
2603
goto end;
2604
}
2605
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2606
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2607
}
2608
run_network_hooks("start", interfaces_hooks != NULL ?
2609
interfaces_hooks : "", delay);
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2610
1788
}
2611
1789
2612
1790
if(not debug){
2613
1791
avahi_set_log_function(empty_log);
2614
1792
}
2615
1793
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
2616
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2617
1827
from the signal handler */
2618
1828
/* Initialize the pseudo-RNG for Avahi */
2619
1829
srand((unsigned int) time(NULL));
2620
simple_poll = avahi_simple_poll_new();
2621
if(simple_poll == NULL){
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2622
1832
fprintf_plus(stderr,
2623
1833
"Avahi: Failed to create simple poll object.\n");
2624
1834
exitcode = EX_UNAVAILABLE;
2688
1898
}
2689
1899
}
2690
1900
2691
/* If no interfaces were specified, make a list */
2692
if(mc.interfaces == NULL){
2693
struct dirent **direntries = NULL;
2694
/* Look for any good interfaces */
2695
ret = scandir(sys_class_net, &direntries, good_interface,
2696
alphasort);
2697
if(ret >= 1){
2698
/* Add all found interfaces to interfaces list */
2699
for(int i = 0; i < ret; ++i){
2700
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2701
direntries[i]->d_name);
2702
if(ret_errno != 0){
2703
errno = ret_errno;
2704
perror_plus("argz_add");
2705
free(direntries[i]);
2706
continue;
2707
}
2708
if(debug){
2709
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2710
direntries[i]->d_name);
2711
}
2712
free(direntries[i]);
2713
}
2714
free(direntries);
2715
} else {
2716
if(ret == 0){
2717
free(direntries);
2718
}
2719
fprintf_plus(stderr, "Could not find a network interface\n");
2720
exitcode = EXIT_FAILURE;
2721
goto end;
2722
}
2723
}
2724
2725
/* Bring up interfaces which are down, and remove any "none"s */
2726
{
2727
char *interface = NULL;
2728
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2729
interface))){
2730
/* If interface name is "none", stop bringing up interfaces.
2731
Also remove all instances of "none" from the list */
2732
if(strcmp(interface, "none") == 0){
2733
argz_delete(&mc.interfaces, &mc.interfaces_size,
2734
interface);
2735
interface = NULL;
2736
while((interface = argz_next(mc.interfaces,
2737
mc.interfaces_size, interface))){
2738
if(strcmp(interface, "none") == 0){
2739
argz_delete(&mc.interfaces, &mc.interfaces_size,
2740
interface);
2741
interface = NULL;
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
2742
1986
}
2743
1987
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2744
2005
break;
2745
2006
}
2746
bool interface_was_up = interface_is_up(interface);
2747
errno = bring_up_interface(interface, delay);
2748
if(not interface_was_up){
2749
if(errno != 0){
2750
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2751
" %s\n", interface, strerror(errno));
2752
} else {
2753
errno = argz_add(&interfaces_to_take_down,
2754
&interfaces_to_take_down_size,
2755
interface);
2756
if(errno != 0){
2757
perror_plus("argz_add");
2758
}
2759
}
2760
}
2761
}
2762
if(debug and (interfaces_to_take_down == NULL)){
2763
fprintf_plus(stderr, "No interfaces were brought up\n");
2764
}
2765
}
2766
2767
/* If we only got one interface, explicitly use only that one */
2768
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2769
if(debug){
2770
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2771
mc.interfaces);
2772
}
2773
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2774
2036
}
2775
2037
2776
2038
if(quit_now){
2777
2039
goto end;
2778
2040
}
2779
2041
2780
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2042
ret = init_gnutls_global(pubkey, seckey);
2781
2043
if(ret == -1){
2782
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
2783
2045
exitcode = EX_UNAVAILABLE;
2790
2052
goto end;
2791
2053
}
2792
2054
2793
/* Try /run/tmp before /tmp */
2794
tempdir = mkdtemp(run_tempdir);
2795
if(tempdir == NULL and errno == ENOENT){
2796
if(debug){
2797
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2798
run_tempdir, old_tempdir);
2799
}
2800
tempdir = mkdtemp(old_tempdir);
2801
}
2802
if(tempdir == NULL){
2055
if(mkdtemp(tempdir) == NULL){
2803
2056
perror_plus("mkdtemp");
2804
2057
goto end;
2805
2058
}
2059
tempdir_created = true;
2806
2060
2807
2061
if(quit_now){
2808
2062
goto end;
2809
2063
}
2810
2064
2811
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2812
2066
fprintf_plus(stderr, "init_gpgme failed\n");
2813
2067
exitcode = EX_UNAVAILABLE;
2814
2068
goto end;
2824
2078
/* Connect directly, do not use Zeroconf */
2825
2079
/* (Mainly meant for debugging) */
2826
2080
char *address = strrchr(connect_to, ':');
2827
2828
2081
if(address == NULL){
2829
2082
fprintf_plus(stderr, "No colon in address\n");
2830
2083
exitcode = EX_USAGE;
2835
2088
goto end;
2836
2089
}
2837
2090
2838
in_port_t port;
2091
uint16_t port;
2839
2092
errno = 0;
2840
2093
tmpmax = strtoimax(address+1, &tmp, 10);
2841
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2842
or tmpmax != (in_port_t)tmpmax){
2095
or tmpmax != (uint16_t)tmpmax){
2843
2096
fprintf_plus(stderr, "Bad port number\n");
2844
2097
exitcode = EX_USAGE;
2845
2098
goto end;
2846
2099
}
2847
2100
2848
2101
if(quit_now){
2849
2102
goto end;
2850
2103
}
2851
2104
2852
port = (in_port_t)tmpmax;
2105
port = (uint16_t)tmpmax;
2853
2106
*address = '\0';
2854
2107
/* Colon in address indicates IPv6 */
2855
2108
int af;
2871
2124
}
2872
2125
2873
2126
while(not quit_now){
2874
ret = start_mandos_communication(address, port, if_index, af,
2875
&mc);
2127
ret = start_mandos_communication(address, port, if_index, af);
2876
2128
if(quit_now or ret == 0){
2877
2129
break;
2878
2130
}
2880
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2881
2133
(int)retry_interval);
2882
2134
}
2883
sleep((unsigned int)retry_interval);
2135
sleep((int)retry_interval);
2884
2136
}
2885
2137
2886
if(not quit_now){
2138
if (not quit_now){
2887
2139
exitcode = EXIT_SUCCESS;
2888
2140
}
2889
2141
2904
2156
config.publish_domain = 0;
2905
2157
2906
2158
/* Allocate a new server */
2907
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2908
&config, NULL, NULL, &ret_errno);
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2909
2162
2910
2163
/* Free the Avahi configuration data */
2911
2164
avahi_server_config_free(&config);
2914
2167
/* Check if creating the Avahi server object succeeded */
2915
2168
if(mc.server == NULL){
2916
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2917
avahi_strerror(ret_errno));
2170
avahi_strerror(error));
2918
2171
exitcode = EX_UNAVAILABLE;
2919
2172
goto end;
2920
2173
}
2926
2179
/* Create the Avahi service browser */
2927
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
2928
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2929
NULL, 0, browse_callback,
2930
(void *)&mc);
2182
NULL, 0, browse_callback, NULL);
2931
2183
if(sb == NULL){
2932
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2933
2185
avahi_strerror(avahi_server_errno(mc.server)));
2944
2196
if(debug){
2945
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2946
2198
}
2947
2948
ret = avahi_loop_with_timeout(simple_poll,
2949
(int)(retry_interval * 1000), &mc);
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2950
2202
if(debug){
2951
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2952
2204
(ret == 0) ? "successfully" : "with error");
2959
2211
}
2960
2212
2961
2213
/* Cleanup things */
2962
free(mc.interfaces);
2963
2964
2214
if(sb != NULL)
2965
2215
avahi_s_service_browser_free(sb);
2966
2216
2967
2217
if(mc.server != NULL)
2968
2218
avahi_server_free(mc.server);
2969
2219
2970
if(simple_poll != NULL)
2971
avahi_simple_poll_free(simple_poll);
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2972
2222
2973
2223
if(gnutls_initialized){
2974
2224
gnutls_certificate_free_credentials(mc.cred);
2986
2236
mc.current_server->prev->next = NULL;
2987
2237
while(mc.current_server != NULL){
2988
2238
server *next = mc.current_server->next;
2989
#ifdef __GNUC__
2990
#pragma GCC diagnostic push
2991
#pragma GCC diagnostic ignored "-Wcast-qual"
2992
#endif
2993
free((char *)(mc.current_server->ip));
2994
#ifdef __GNUC__
2995
#pragma GCC diagnostic pop
2996
#endif
2997
2239
free(mc.current_server);
2998
2240
mc.current_server = next;
2999
2241
}
3000
2242
}
3001
2243
3002
/* Re-raise privileges */
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
3003
2248
{
3004
ret_errno = raise_privileges();
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3007
perror_plus("Failed to raise privileges");
3008
} else {
3009
3010
/* Run network hooks */
3011
run_network_hooks("stop", interfaces_hooks != NULL ?
3012
interfaces_hooks : "", delay);
3013
3014
/* Take down the network interfaces which were brought up */
3015
{
3016
char *interface = NULL;
3017
while((interface=argz_next(interfaces_to_take_down,
3018
interfaces_to_take_down_size,
3019
interface))){
3020
ret_errno = take_down_interface(interface);
3021
if(ret_errno != 0){
3022
errno = ret_errno;
3023
perror_plus("Failed to take down interface");
3024
}
3025
}
3026
if(debug and (interfaces_to_take_down == NULL)){
3027
fprintf_plus(stderr, "No interfaces needed to be taken"
3028
" down\n");
3029
}
3030
}
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
3031
2253
}
3032
2254
3033
ret_errno = lower_privileges_permanently();
3034
if(ret_errno != 0){
3035
errno = ret_errno;
3036
perror_plus("Failed to lower privileges permanently");
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
}
2266
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
3037
2271
}
3038
2272
}
3039
3040
free(interfaces_to_take_down);
3041
free(interfaces_hooks);
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
3042
2279
3043
2280
/* Removes the GPGME temp directory and all files inside */
3044
if(tempdir != NULL){
2281
if(tempdir_created){
3045
2282
struct dirent **direntries = NULL;
3046
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3047
| O_NOFOLLOW
3048
| O_DIRECTORY
3049
| O_PATH));
3050
if(tempdir_fd == -1){
3051
perror_plus("open");
3052
} else {
3053
#ifdef __GLIBC__
3054
#if __GLIBC_PREREQ(2, 15)
3055
int numentries = scandirat(tempdir_fd, ".", &direntries,
3056
notdotentries, alphasort);
3057
#else /* not __GLIBC_PREREQ(2, 15) */
3058
int numentries = scandir(tempdir, &direntries, notdotentries,
3059
alphasort);
3060
#endif /* not __GLIBC_PREREQ(2, 15) */
3061
#else /* not __GLIBC__ */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC__ */
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3068
if(ret == -1){
3069
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3070
" \"%s\", 0): %s\n", tempdir,
3071
direntries[i]->d_name, strerror(errno));
3072
}
3073
free(direntries[i]);
3074
}
3075
3076
/* need to clean even if 0 because man page doesn't specify */
3077
free(direntries);
3078
if(numentries == -1){
3079
perror_plus("scandir");
3080
}
3081
ret = rmdir(tempdir);
3082
if(ret == -1 and errno != ENOENT){
3083
perror_plus("rmdir");
3084
}
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
2289
char *fullname = NULL;
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
2291
direntry->d_name);
2292
if(ret < 0){
2293
perror_plus("asprintf");
2294
continue;
2295
}
2296
ret = remove(fullname);
2297
if(ret == -1){
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
2300
}
2301
free(fullname);
3085
2302
}
3086
close(tempdir_fd);
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
2309
}
2310
ret = rmdir(tempdir);
2311
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
3087
2313
}
3088
2314
}
3089
2315
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0