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237.7.310
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-08 21:18:49 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150708211849-scisutuofnxumqc7
mandos-client: Add --dh-params FILE option.
* plugins.d/mandos-client.c: Added --dh-params FILE option.
(init_gnutls_global): New "dhparamsfilename" argument. All callers
changed. Read and use Diffie-Hellman
parameters from it. Bug fix: check for error
when opening seckeyfile for the second time.
(init_gnutls_session): Remove unnecessary call to
gnutls_dh_set_prime_bits();
(main): New variable "dh_params_file".
(main/argp_options): Added "--dh-params" option.
(main/parse_opt): - '' -
* plugins.d/mandos-client.xml (SYNOPSIS): Add --dh-params option.
(OPTIONS): Document --dh-params option and document that the
--dh-bits options is potentially overridden by the
--dh-params option.
* plugins.d/mandos-client.c: Added --dh-params FILE option.
(init_gnutls_global): New "dhparamsfilename" argument. All callers
changed. Read and use Diffie-Hellman
parameters from it. Bug fix: check for error
when opening seckeyfile for the second time.
(init_gnutls_session): Remove unnecessary call to
gnutls_dh_set_prime_bits();
(main): New variable "dh_params_file".
(main/argp_options): Added "--dh-params" option.
(main/parse_opt): - '' -
* plugins.d/mandos-client.xml (SYNOPSIS): Add --dh-params option.
(OPTIONS): Document --dh-params option and document that the
--dh-bits options is potentially overridden by the
--dh-params option.
- files added:
- debian/mandos-client.examples
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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(),
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() */
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
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
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
90
91
#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() */
91
98
92
99
#ifdef __linux__
93
100
#include <sys/klog.h> /* klogctl() */
135
142
static const char sys_class_net[] = "/sys/class/net";
136
143
char *connect_to = NULL;
137
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
138
148
139
149
/* Doubly linked list that need to be circularly linked when used */
140
150
typedef struct server{
141
151
const char *ip;
142
uint16_t port;
152
in_port_t port;
143
153
AvahiIfIndex if_index;
144
154
int af;
145
155
struct timespec last_seen;
149
159
150
160
/* Used for passing in values through the Avahi callback functions */
151
161
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
162
AvahiServer *server;
154
163
gnutls_certificate_credentials_t cred;
155
164
unsigned int dh_bits;
157
166
const char *priority;
158
167
gpgme_ctx_t ctx;
159
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
160
171
} mandos_context;
161
172
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 };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
175
168
176
sig_atomic_t quit_now = 0;
169
177
int signal_received = 0;
177
185
perror(print_text);
178
186
}
179
187
180
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
189
int fprintf_plus(FILE *stream, const char *format, ...){
182
190
va_list ap;
183
191
va_start (ap, format);
184
192
185
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
194
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
196
}
189
197
190
198
/*
192
200
* bytes. "buffer_capacity" is how much is currently allocated,
193
201
* "buffer_length" is how much is already used.
194
202
*/
203
__attribute__((nonnull, warn_unused_result))
195
204
size_t incbuffer(char **buffer, size_t buffer_length,
196
205
size_t buffer_capacity){
197
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
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;
200
213
return 0;
201
214
}
215
*buffer = new_buf;
202
216
buffer_capacity += BUFFER_SIZE;
203
217
}
204
218
return buffer_capacity;
205
219
}
206
220
207
221
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
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){
210
225
int ret;
211
226
server *new_server = malloc(sizeof(server));
212
227
if(new_server == NULL){
219
234
.af = af };
220
235
if(new_server->ip == NULL){
221
236
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);
222
252
return false;
223
253
}
224
254
/* Special case of first server */
225
if (mc.current_server == NULL){
255
if(*current_server == NULL){
226
256
new_server->next = new_server;
227
257
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
258
*current_server = new_server;
230
259
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
233
263
new_server->prev->next = 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;
264
(*current_server)->prev = new_server;
240
265
}
241
266
return true;
242
267
}
244
269
/*
245
270
* Initialize GPGME.
246
271
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
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){
249
277
gpgme_error_t rc;
250
278
gpgme_engine_info_t engine_info;
251
279
252
253
280
/*
254
281
* Helper function to insert pub and seckey to the engine keyring.
255
282
*/
256
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
257
284
int ret;
258
285
int fd;
259
286
gpgme_data_t pgp_data;
271
298
return false;
272
299
}
273
300
274
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
275
302
if(rc != GPG_ERR_NO_ERROR){
276
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
304
gpgme_strsource(rc), gpgme_strerror(rc));
321
348
}
322
349
323
350
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
325
352
if(rc != GPG_ERR_NO_ERROR){
326
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
340
367
* Decrypt OpenPGP data.
341
368
* Returns -1 on error
342
369
*/
370
__attribute__((nonnull, warn_unused_result))
343
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
372
size_t crypto_size,
345
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
346
375
gpgme_data_t dh_crypto, dh_plain;
347
376
gpgme_error_t rc;
348
377
ssize_t ret;
374
403
375
404
/* Decrypt data from the cryptotext data buffer to the plaintext
376
405
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
407
if(rc != GPG_ERR_NO_ERROR){
379
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
409
gpgme_strsource(rc), gpgme_strerror(rc));
381
410
plaintext_length = -1;
382
411
if(debug){
383
412
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
385
414
if(result == NULL){
386
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
416
} else {
464
493
return plaintext_length;
465
494
}
466
495
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;
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);
473
507
}
474
508
475
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
476
511
static void debuggnutls(__attribute__((unused)) int level,
477
512
const char* string){
478
513
fprintf_plus(stderr, "GnuTLS: %s", string);
479
514
}
480
515
516
__attribute__((nonnull, warn_unused_result))
481
517
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
483
521
int ret;
522
unsigned int uret;
484
523
485
524
if(debug){
486
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
502
541
}
503
542
504
543
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
545
if(ret != GNUTLS_E_SUCCESS){
507
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
547
safer_gnutls_strerror(ret));
518
557
}
519
558
520
559
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
522
561
GNUTLS_OPENPGP_FMT_BASE64);
523
562
if(ret != GNUTLS_E_SUCCESS){
524
563
fprintf_plus(stderr,
530
569
}
531
570
532
571
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
534
573
if(ret != GNUTLS_E_SUCCESS){
535
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
575
" initialization: %s\n",
537
576
safer_gnutls_strerror(ret));
538
577
goto globalfail;
539
578
}
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);
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);
548
752
549
753
return 0;
550
754
551
755
globalfail:
552
756
553
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
554
758
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
556
760
return -1;
557
761
}
558
762
559
static int init_gnutls_session(gnutls_session_t *session){
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
560
766
int ret;
561
767
/* GnuTLS session creation */
562
768
do {
574
780
{
575
781
const char *err;
576
782
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
784
if(quit_now){
579
785
gnutls_deinit(*session);
580
786
return -1;
591
797
592
798
do {
593
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
800
mc->cred);
595
801
if(quit_now){
596
802
gnutls_deinit(*session);
597
803
return -1;
607
813
/* ignore client certificate if any. */
608
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
815
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
612
816
return 0;
613
817
}
614
818
616
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
821
__attribute__((unused)) const char *txt){}
618
822
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 = (int)TEMP_FAILURE_RETRY(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
TEMP_FAILURE_RETRY(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
619
1040
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
621
1043
AvahiIfIndex if_index,
622
int af){
1044
int af, mandos_context *mc){
623
1045
int ret, tcp_sd = -1;
624
1046
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1047
struct sockaddr_storage to;
629
1048
char *buffer = NULL;
630
1049
char *decrypted_buffer = NULL;
631
1050
size_t buffer_length = 0;
634
1053
int retval = -1;
635
1054
gnutls_session_t session;
636
1055
int pf; /* Protocol family */
1056
bool route_added = false;
637
1057
638
1058
errno = 0;
639
1059
655
1075
return -1;
656
1076
}
657
1077
658
ret = init_gnutls_session(&session);
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);
659
1111
if(ret != 0){
660
1112
return -1;
661
1113
}
662
1114
663
1115
if(debug){
664
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
1117
PRIuMAX "\n", ip, (uintmax_t)port);
666
1118
}
667
1119
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
669
1121
if(tcp_sd < 0){
670
1122
int e = errno;
671
1123
perror_plus("socket");
680
1132
681
1133
memset(&to, 0, sizeof(to));
682
1134
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
685
1137
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
688
1140
}
689
1141
if(ret < 0 ){
690
1142
int e = errno;
699
1151
goto mandos_end;
700
1152
}
701
1153
if(af == AF_INET6){
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*/
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
1157
if(if_index == AVAHI_IF_UNSPEC){
710
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
711
1159
" incomplete without a network interface\n");
713
1161
goto mandos_end;
714
1162
}
715
1163
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
1165
}
718
1166
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
1168
}
723
1169
724
1170
if(quit_now){
732
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1179
perror_plus("if_indextoname");
734
1180
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
737
1183
}
738
1184
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
741
1187
}
742
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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;
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(errno == ENETUNREACH
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
783
1270
}
784
1271
785
1272
const char *out = mandos_protocol_version;
936
1423
if(buffer_length > 0){
937
1424
ssize_t decrypted_buffer_size;
938
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
939
&decrypted_buffer);
1426
&decrypted_buffer, mc);
940
1427
if(decrypted_buffer_size >= 0){
941
1428
942
1429
written = 0;
968
1455
969
1456
mandos_end:
970
1457
{
1458
if(route_added){
1459
if(not delete_local_route(ip, if_index)){
1460
fprintf_plus(stderr, "Failed to delete local route to %s on"
1461
" interface %d", ip, if_index);
1462
}
1463
}
971
1464
int e = errno;
972
1465
free(decrypted_buffer);
973
1466
free(buffer);
990
1483
return retval;
991
1484
}
992
1485
1486
__attribute__((nonnull))
993
1487
static void resolve_callback(AvahiSServiceResolver *r,
994
1488
AvahiIfIndex interface,
995
1489
AvahiProtocol proto,
1003
1497
AVAHI_GCC_UNUSED AvahiStringList *txt,
1004
1498
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1005
1499
flags,
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1500
void *mc){
1501
if(r == NULL){
1502
return;
1503
}
1008
1504
1009
1505
/* Called whenever a service has been resolved successfully or
1010
1506
timed out */
1011
1507
1012
1508
if(quit_now){
1509
avahi_s_service_resolver_free(r);
1013
1510
return;
1014
1511
}
1015
1512
1019
1516
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
1517
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
1518
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
1519
avahi_strerror(avahi_server_errno
1520
(((mandos_context*)mc)->server)));
1023
1521
break;
1024
1522
1025
1523
case AVAHI_RESOLVER_FOUND:
1031
1529
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
1530
host_name, ip, (intmax_t)interface, port);
1033
1531
}
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1532
int ret = start_mandos_communication(ip, (in_port_t)port,
1533
interface,
1534
avahi_proto_to_af(proto),
1535
mc);
1036
1536
if(ret == 0){
1037
avahi_simple_poll_quit(mc.simple_poll);
1537
avahi_simple_poll_quit(simple_poll);
1038
1538
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1539
if(not add_server(ip, (in_port_t)port, interface,
1540
avahi_proto_to_af(proto),
1541
&((mandos_context*)mc)->current_server)){
1041
1542
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
1543
" list\n", name);
1043
1544
}
1056
1557
const char *domain,
1057
1558
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
1559
flags,
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1560
void *mc){
1561
if(b == NULL){
1562
return;
1563
}
1061
1564
1062
1565
/* Called whenever a new services becomes available on the LAN or
1063
1566
is removed from the LAN */
1071
1574
case AVAHI_BROWSER_FAILURE:
1072
1575
1073
1576
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1577
avahi_strerror(avahi_server_errno
1578
(((mandos_context*)mc)->server)));
1579
avahi_simple_poll_quit(simple_poll);
1076
1580
return;
1077
1581
1078
1582
case AVAHI_BROWSER_NEW:
1081
1585
the callback function is called the Avahi server will free the
1082
1586
resolver for us. */
1083
1587
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1588
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1589
interface, protocol, name, type,
1590
domain, protocol, 0,
1591
resolve_callback, mc) == NULL)
1087
1592
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
1593
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
1594
avahi_strerror(avahi_server_errno
1595
(((mandos_context*)mc)->server)));
1090
1596
break;
1091
1597
1092
1598
case AVAHI_BROWSER_REMOVE:
1111
1617
signal_received = sig;
1112
1618
int old_errno = errno;
1113
1619
/* set main loop to exit */
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1620
if(simple_poll != NULL){
1621
avahi_simple_poll_quit(simple_poll);
1116
1622
}
1117
1623
errno = old_errno;
1118
1624
}
1119
1625
1626
__attribute__((nonnull, warn_unused_result))
1120
1627
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
1628
int ret;
1629
error_t ret_errno;
1122
1630
1123
1631
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
1632
if(s < 0){
1633
ret_errno = errno;
1125
1634
perror_plus("socket");
1635
errno = ret_errno;
1126
1636
return false;
1127
1637
}
1128
1638
strcpy(ifr->ifr_name, ifname);
1129
1639
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
1640
if(ret == -1){
1131
1641
if(debug){
1642
ret_errno = errno;
1132
1643
perror_plus("ioctl SIOCGIFFLAGS");
1644
errno = ret_errno;
1133
1645
}
1134
1646
return false;
1135
1647
}
1136
1648
return true;
1137
1649
}
1138
1650
1651
__attribute__((nonnull, warn_unused_result))
1139
1652
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1653
1141
1654
/* Reject the loopback device */
1183
1696
* corresponds to an acceptable network device.
1184
1697
* (This function is passed to scandir(3) as a filter function.)
1185
1698
*/
1699
__attribute__((nonnull, warn_unused_result))
1186
1700
int good_interface(const struct dirent *if_entry){
1187
1701
if(if_entry->d_name[0] == '.'){
1188
1702
return 0;
1204
1718
}
1205
1719
1206
1720
/*
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
1721
* This function determines if a network interface is up.
1722
*/
1723
__attribute__((nonnull, warn_unused_result))
1724
bool interface_is_up(const char *interface){
1725
struct ifreq ifr;
1726
if(not get_flags(interface, &ifr)){
1727
if(debug){
1728
fprintf_plus(stderr, "Failed to get flags for interface "
1729
"\"%s\"\n", interface);
1730
}
1731
return false;
1732
}
1733
1734
return (bool)(ifr.ifr_flags & IFF_UP);
1735
}
1736
1737
/*
1738
* This function determines if a network interface is running
1739
*/
1740
__attribute__((nonnull, warn_unused_result))
1741
bool interface_is_running(const char *interface){
1742
struct ifreq ifr;
1743
if(not get_flags(interface, &ifr)){
1744
if(debug){
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
}
1748
return false;
1749
}
1750
1751
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1752
}
1753
1754
__attribute__((nonnull, pure, warn_unused_result))
1249
1755
int notdotentries(const struct dirent *direntry){
1250
1756
/* Skip "." and ".." */
1251
1757
if(direntry->d_name[0] == '.'
1258
1764
}
1259
1765
1260
1766
/* Is this directory entry a runnable program? */
1767
__attribute__((nonnull, warn_unused_result))
1261
1768
int runnable_hook(const struct dirent *direntry){
1262
1769
int ret;
1263
1770
size_t sret;
1271
1778
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1779
"abcdefghijklmnopqrstuvwxyz"
1273
1780
"0123456789"
1274
"_-");
1781
"_.-");
1275
1782
if((direntry->d_name)[sret] != '\0'){
1276
1783
/* Contains non-allowed characters */
1277
1784
if(debug){
1281
1788
return 0;
1282
1789
}
1283
1790
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);
1791
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
1792
if(ret == -1){
1293
1793
if(debug){
1294
1794
perror_plus("Could not stat hook");
1318
1818
return 1;
1319
1819
}
1320
1820
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1821
__attribute__((nonnull, warn_unused_result))
1822
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1823
mandos_context *mc){
1322
1824
int ret;
1323
1825
struct timespec now;
1324
1826
struct timespec waited_time;
1325
1827
intmax_t block_time;
1326
1828
1327
1829
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1830
if(mc->current_server == NULL){
1831
if(debug){
1330
1832
fprintf_plus(stderr, "Wait until first server is found."
1331
1833
" No timeout!\n");
1332
1834
}
1333
1835
ret = avahi_simple_poll_iterate(s, -1);
1334
1836
} else {
1335
if (debug){
1837
if(debug){
1336
1838
fprintf_plus(stderr, "Check current_server if we should run"
1337
1839
" it, or wait\n");
1338
1840
}
1345
1847
/* Calculating in ms how long time between now and server
1346
1848
who we visted longest time ago. Now - last seen. */
1347
1849
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1850
- mc->current_server->last_seen.tv_sec);
1349
1851
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1852
- mc->current_server->last_seen.tv_nsec);
1351
1853
/* total time is 10s/10,000ms.
1352
1854
Converting to s from ms by dividing by 1,000,
1353
1855
and ns to ms by dividing by 1,000,000. */
1355
1857
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1858
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1859
1358
if (debug){
1860
if(debug){
1359
1861
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
1862
block_time);
1361
1863
}
1362
1864
1363
1865
if(block_time <= 0){
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);
1866
ret = start_mandos_communication(mc->current_server->ip,
1867
mc->current_server->port,
1868
mc->current_server->if_index,
1869
mc->current_server->af, mc);
1368
1870
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1871
avahi_simple_poll_quit(s);
1370
1872
return 0;
1371
1873
}
1372
1874
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1875
&mc->current_server->last_seen);
1374
1876
if(ret == -1){
1375
1877
perror_plus("clock_gettime");
1376
1878
return -1;
1377
1879
}
1378
mc.current_server = mc.current_server->next;
1880
mc->current_server = mc->current_server->next;
1379
1881
block_time = 0; /* Call avahi to find new Mandos
1380
1882
servers, but don't block */
1381
1883
}
1383
1885
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1886
}
1385
1887
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1888
if(ret > 0 or errno != EINTR){
1387
1889
return (ret != 1) ? ret : 0;
1388
1890
}
1389
1891
}
1390
1892
}
1391
1893
}
1392
1894
1393
bool run_network_hooks(const char *mode, const char *interface,
1895
__attribute__((nonnull))
1896
void run_network_hooks(const char *mode, const char *interface,
1394
1897
const float delay){
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1898
struct dirent **direntries = NULL;
1899
if(hookdir_fd == -1){
1900
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1901
| O_CLOEXEC);
1902
if(hookdir_fd == -1){
1903
if(errno == ENOENT){
1904
if(debug){
1905
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1906
" found\n", hookdir);
1907
}
1908
} else {
1909
perror_plus("open");
1910
}
1911
return;
1912
}
1913
}
1914
#ifdef __GLIBC__
1915
#if __GLIBC_PREREQ(2, 15)
1916
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1917
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1920
alphasort);
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1924
alphasort);
1925
#endif /* not __GLIBC__ */
1400
1926
if(numhooks == -1){
1401
1927
perror_plus("scandir");
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){
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1942
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1409
1989
perror_plus("asprintf");
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
}
1990
_exit(EX_OSERR);
1991
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1478
1994
free(delaystring);
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;
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
2063
} else {
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
2083
}
2084
2085
__attribute__((nonnull, warn_unused_result))
2086
error_t bring_up_interface(const char *const interface,
2087
const float delay){
2088
error_t old_errno = errno;
2089
int ret;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2092
if(if_index == 0){
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2094
errno = old_errno;
2095
return ENXIO;
2096
}
2097
2098
if(quit_now){
2099
errno = old_errno;
2100
return EINTR;
2101
}
2102
2103
if(not interface_is_up(interface)){
2104
error_t ret_errno = 0, ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
2106
ret_errno = errno;
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2108
"\"%s\"\n", interface);
2109
errno = old_errno;
2110
return ret_errno;
2111
}
2112
network.ifr_flags |= IFF_UP; /* set flag */
2113
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2115
if(sd == -1){
2116
ret_errno = errno;
2117
perror_plus("socket");
2118
errno = old_errno;
2119
return ret_errno;
2120
}
2121
2122
if(quit_now){
2123
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2124
if(ret == -1){
2125
perror_plus("close");
2126
}
2127
errno = old_errno;
2128
return EINTR;
2129
}
2130
2131
if(debug){
2132
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2133
interface);
2134
}
2135
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2138
if(ret_errno != 0){
2139
errno = ret_errno;
2140
perror_plus("Failed to raise privileges");
2141
}
2142
2143
#ifdef __linux__
2144
int ret_linux;
2145
bool restore_loglevel = false;
2146
if(ret_errno == 0){
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
} else {
2153
restore_loglevel = true;
2154
}
2155
}
2156
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
2159
#ifdef __linux__
2160
if(restore_loglevel){
2161
ret_linux = klogctl(7, NULL, 0);
2162
if(ret_linux == -1){
2163
perror_plus("klogctl");
2164
}
2165
}
2166
#endif /* __linux__ */
2167
2168
/* If raise_privileges() succeeded above */
2169
if(ret_errno == 0){
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2172
if(ret_errno != 0){
2173
errno = ret_errno;
2174
perror_plus("Failed to lower privileges");
2175
}
2176
}
2177
2178
/* Close the socket */
2179
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2180
if(ret == -1){
2181
perror_plus("close");
2182
}
2183
2184
if(ret_setflags == -1){
2185
errno = ioctl_errno;
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2187
errno = old_errno;
2188
return ioctl_errno;
2189
}
2190
} else if(debug){
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2192
interface);
2193
}
2194
2195
/* Sleep checking until interface is running.
2196
Check every 0.25s, up to total time of delay */
2197
for(int i=0; i < delay * 4; i++){
2198
if(interface_is_running(interface)){
2199
break;
2200
}
2201
struct timespec sleeptime = { .tv_nsec = 250000000 };
2202
ret = nanosleep(&sleeptime, NULL);
2203
if(ret == -1 and errno != EINTR){
2204
perror_plus("nanosleep");
2205
}
2206
}
2207
2208
errno = old_errno;
2209
return 0;
2210
}
2211
2212
__attribute__((nonnull, warn_unused_result))
2213
error_t take_down_interface(const char *const interface){
2214
error_t old_errno = errno;
2215
struct ifreq network;
2216
unsigned int if_index = if_nametoindex(interface);
2217
if(if_index == 0){
2218
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2219
errno = old_errno;
2220
return ENXIO;
2221
}
2222
if(interface_is_up(interface)){
2223
error_t ret_errno = 0, ioctl_errno = 0;
2224
if(not get_flags(interface, &network) and debug){
2225
ret_errno = errno;
2226
fprintf_plus(stderr, "Failed to get flags for interface "
2227
"\"%s\"\n", interface);
2228
errno = old_errno;
2229
return ret_errno;
2230
}
2231
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2232
2233
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2234
if(sd == -1){
2235
ret_errno = errno;
2236
perror_plus("socket");
2237
errno = old_errno;
2238
return ret_errno;
2239
}
2240
2241
if(debug){
2242
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2243
interface);
2244
}
2245
2246
/* Raise privileges */
2247
ret_errno = raise_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to raise privileges");
2251
}
2252
2253
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2254
ioctl_errno = errno;
2255
2256
/* If raise_privileges() succeeded above */
2257
if(ret_errno == 0){
2258
/* Lower privileges */
2259
ret_errno = lower_privileges();
2260
if(ret_errno != 0){
2261
errno = ret_errno;
2262
perror_plus("Failed to lower privileges");
2263
}
2264
}
2265
2266
/* Close the socket */
2267
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
2271
2272
if(ret_setflags == -1){
2273
errno = ioctl_errno;
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2275
errno = old_errno;
2276
return ioctl_errno;
2277
}
2278
} else if(debug){
2279
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2280
interface);
2281
}
2282
2283
errno = old_errno;
2284
return 0;
1527
2285
}
1528
2286
1529
2287
int main(int argc, char *argv[]){
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
2289
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2291
.interfaces = NULL, .interfaces_size = 0 };
1530
2292
AvahiSServiceBrowser *sb = NULL;
1531
int error;
2293
error_t ret_errno;
1532
2294
int ret;
1533
2295
intmax_t tmpmax;
1534
2296
char *tmp;
1535
2297
int exitcode = EXIT_SUCCESS;
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;
2298
char *interfaces_to_take_down = NULL;
2299
size_t interfaces_to_take_down_size = 0;
2300
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2301
char old_tempdir[] = "/tmp/mandosXXXXXX";
2302
char *tempdir = NULL;
1544
2303
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1545
2304
const char *seckey = PATHDIR "/" SECKEY;
1546
2305
const char *pubkey = PATHDIR "/" PUBKEY;
2306
const char *dh_params_file = NULL;
2307
char *interfaces_hooks = NULL;
1547
2308
1548
2309
bool gnutls_initialized = false;
1549
2310
bool gpgme_initialized = false;
1601
2362
.doc = "Bit length of the prime number used in the"
1602
2363
" Diffie-Hellman key exchange",
1603
2364
.group = 2 },
2365
{ .name = "dh-params", .key = 134,
2366
.arg = "FILE",
2367
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2368
" for the Diffie-Hellman key exchange",
2369
.group = 2 },
1604
2370
{ .name = "priority", .key = 130,
1605
2371
.arg = "STRING",
1606
2372
.doc = "GnuTLS priority string for the TLS handshake",
1640
2406
connect_to = arg;
1641
2407
break;
1642
2408
case 'i': /* --interface */
1643
interface = arg;
2409
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2410
arg, (int)',');
2411
if(ret_errno != 0){
2412
argp_error(state, "%s", strerror(ret_errno));
2413
}
1644
2414
break;
1645
2415
case 's': /* --seckey */
1646
2416
seckey = arg;
1657
2427
}
1658
2428
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1659
2429
break;
2430
case 134: /* --dh-params */
2431
dh_params_file = arg;
2432
break;
1660
2433
case 130: /* --priority */
1661
2434
mc.priority = arg;
1662
2435
break;
1718
2491
goto end;
1719
2492
}
1720
2493
}
1721
2494
1722
2495
{
1723
2496
/* Work around Debian bug #633582:
1724
2497
<http://bugs.debian.org/633582> */
1725
2498
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2499
/* Re-raise privileges */
2500
ret_errno = raise_privileges();
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2503
perror_plus("Failed to raise privileges");
1731
2504
} else {
1732
2505
struct stat st;
1733
2506
1751
2524
TEMP_FAILURE_RETRY(close(seckey_fd));
1752
2525
}
1753
2526
}
1754
2527
1755
2528
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
2529
int pubkey_fd = open(pubkey, O_RDONLY);
1757
2530
if(pubkey_fd == -1){
1772
2545
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
2546
}
1774
2547
}
1775
2548
1776
2549
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2550
ret_errno = lower_privileges();
2551
if(ret_errno != 0){
2552
errno = ret_errno;
2553
perror_plus("Failed to lower privileges");
2554
}
2555
}
2556
}
2557
2558
/* Remove invalid interface names (except "none") */
2559
{
2560
char *interface = NULL;
2561
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2562
interface))){
2563
if(strcmp(interface, "none") != 0
2564
and if_nametoindex(interface) == 0){
2565
if(interface[0] != '\0'){
2566
fprintf_plus(stderr, "Not using nonexisting interface"
2567
" \"%s\"\n", interface);
2568
}
2569
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2570
interface = NULL;
1781
2571
}
1782
2572
}
1783
2573
}
1784
2574
1785
2575
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2576
{
2577
if(mc.interfaces != NULL){
2578
interfaces_hooks = malloc(mc.interfaces_size);
2579
if(interfaces_hooks == NULL){
2580
perror_plus("malloc");
2581
goto end;
2582
}
2583
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2584
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2585
}
2586
run_network_hooks("start", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
1788
2588
}
1789
2589
1790
2590
if(not debug){
1791
2591
avahi_set_log_function(empty_log);
1792
2592
}
1793
2593
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
1826
2594
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
2595
from the signal handler */
1828
2596
/* Initialize the pseudo-RNG for Avahi */
1829
2597
srand((unsigned int) time(NULL));
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2598
simple_poll = avahi_simple_poll_new();
2599
if(simple_poll == NULL){
1832
2600
fprintf_plus(stderr,
1833
2601
"Avahi: Failed to create simple poll object.\n");
1834
2602
exitcode = EX_UNAVAILABLE;
1898
2666
}
1899
2667
}
1900
2668
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");
2669
/* If no interfaces were specified, make a list */
2670
if(mc.interfaces == NULL){
2671
struct dirent **direntries = NULL;
2672
/* Look for any good interfaces */
2673
ret = scandir(sys_class_net, &direntries, good_interface,
2674
alphasort);
2675
if(ret >= 1){
2676
/* Add all found interfaces to interfaces list */
2677
for(int i = 0; i < ret; ++i){
2678
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2679
direntries[i]->d_name);
2680
if(ret_errno != 0){
2681
errno = ret_errno;
2682
perror_plus("argz_add");
2683
free(direntries[i]);
2684
continue;
2685
}
2686
if(debug){
2687
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2688
direntries[i]->d_name);
2689
}
2690
free(direntries[i]);
2691
}
2692
free(direntries);
2693
} else {
2694
if(ret == 0){
2695
free(direntries);
2696
}
2697
fprintf_plus(stderr, "Could not find a network interface\n");
2698
exitcode = EXIT_FAILURE;
2699
goto end;
2700
}
2701
}
2702
2703
/* Bring up interfaces which are down, and remove any "none"s */
2704
{
2705
char *interface = NULL;
2706
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2707
interface))){
2708
/* If interface name is "none", stop bringing up interfaces.
2709
Also remove all instances of "none" from the list */
2710
if(strcmp(interface, "none") == 0){
2711
argz_delete(&mc.interfaces, &mc.interfaces_size,
2712
interface);
2713
interface = NULL;
2714
while((interface = argz_next(mc.interfaces,
2715
mc.interfaces_size, interface))){
2716
if(strcmp(interface, "none") == 0){
2717
argz_delete(&mc.interfaces, &mc.interfaces_size,
2718
interface);
2719
interface = NULL;
1986
2720
}
1987
2721
}
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){
2005
2722
break;
2006
2723
}
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
}
2724
bool interface_was_up = interface_is_up(interface);
2725
errno = bring_up_interface(interface, delay);
2726
if(not interface_was_up){
2727
if(errno != 0){
2728
perror_plus("Failed to bring up interface");
2729
} else {
2730
errno = argz_add(&interfaces_to_take_down,
2731
&interfaces_to_take_down_size,
2732
interface);
2733
if(errno != 0){
2734
perror_plus("argz_add");
2735
}
2736
}
2737
}
2738
}
2739
if(debug and (interfaces_to_take_down == NULL)){
2740
fprintf_plus(stderr, "No interfaces were brought up\n");
2741
}
2742
}
2743
2744
/* If we only got one interface, explicitly use only that one */
2745
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2746
if(debug){
2747
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2748
mc.interfaces);
2749
}
2750
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2036
2751
}
2037
2752
2038
2753
if(quit_now){
2039
2754
goto end;
2040
2755
}
2041
2756
2042
ret = init_gnutls_global(pubkey, seckey);
2757
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2043
2758
if(ret == -1){
2044
2759
fprintf_plus(stderr, "init_gnutls_global failed\n");
2045
2760
exitcode = EX_UNAVAILABLE;
2052
2767
goto end;
2053
2768
}
2054
2769
2055
if(mkdtemp(tempdir) == NULL){
2770
/* Try /run/tmp before /tmp */
2771
tempdir = mkdtemp(run_tempdir);
2772
if(tempdir == NULL and errno == ENOENT){
2773
if(debug){
2774
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2775
run_tempdir, old_tempdir);
2776
}
2777
tempdir = mkdtemp(old_tempdir);
2778
}
2779
if(tempdir == NULL){
2056
2780
perror_plus("mkdtemp");
2057
2781
goto end;
2058
2782
}
2059
tempdir_created = true;
2060
2783
2061
2784
if(quit_now){
2062
2785
goto end;
2063
2786
}
2064
2787
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2788
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2066
2789
fprintf_plus(stderr, "init_gpgme failed\n");
2067
2790
exitcode = EX_UNAVAILABLE;
2068
2791
goto end;
2078
2801
/* Connect directly, do not use Zeroconf */
2079
2802
/* (Mainly meant for debugging) */
2080
2803
char *address = strrchr(connect_to, ':');
2804
2081
2805
if(address == NULL){
2082
2806
fprintf_plus(stderr, "No colon in address\n");
2083
2807
exitcode = EX_USAGE;
2088
2812
goto end;
2089
2813
}
2090
2814
2091
uint16_t port;
2815
in_port_t port;
2092
2816
errno = 0;
2093
2817
tmpmax = strtoimax(address+1, &tmp, 10);
2094
2818
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
or tmpmax != (uint16_t)tmpmax){
2819
or tmpmax != (in_port_t)tmpmax){
2096
2820
fprintf_plus(stderr, "Bad port number\n");
2097
2821
exitcode = EX_USAGE;
2098
2822
goto end;
2099
2823
}
2100
2824
2101
2825
if(quit_now){
2102
2826
goto end;
2103
2827
}
2104
2828
2105
port = (uint16_t)tmpmax;
2829
port = (in_port_t)tmpmax;
2106
2830
*address = '\0';
2107
2831
/* Colon in address indicates IPv6 */
2108
2832
int af;
2124
2848
}
2125
2849
2126
2850
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2851
ret = start_mandos_communication(address, port, if_index, af,
2852
&mc);
2128
2853
if(quit_now or ret == 0){
2129
2854
break;
2130
2855
}
2132
2857
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
2858
(int)retry_interval);
2134
2859
}
2135
sleep((int)retry_interval);
2860
sleep((unsigned int)retry_interval);
2136
2861
}
2137
2862
2138
if (not quit_now){
2863
if(not quit_now){
2139
2864
exitcode = EXIT_SUCCESS;
2140
2865
}
2141
2866
2156
2881
config.publish_domain = 0;
2157
2882
2158
2883
/* Allocate a new server */
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2884
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2885
&config, NULL, NULL, &ret_errno);
2162
2886
2163
2887
/* Free the Avahi configuration data */
2164
2888
avahi_server_config_free(&config);
2167
2891
/* Check if creating the Avahi server object succeeded */
2168
2892
if(mc.server == NULL){
2169
2893
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2894
avahi_strerror(ret_errno));
2171
2895
exitcode = EX_UNAVAILABLE;
2172
2896
goto end;
2173
2897
}
2179
2903
/* Create the Avahi service browser */
2180
2904
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
2905
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
2906
NULL, 0, browse_callback,
2907
(void *)&mc);
2183
2908
if(sb == NULL){
2184
2909
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
2910
avahi_strerror(avahi_server_errno(mc.server)));
2196
2921
if(debug){
2197
2922
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
2923
}
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2924
2925
ret = avahi_loop_with_timeout(simple_poll,
2926
(int)(retry_interval * 1000), &mc);
2202
2927
if(debug){
2203
2928
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
2929
(ret == 0) ? "successfully" : "with error");
2211
2936
}
2212
2937
2213
2938
/* Cleanup things */
2939
free(mc.interfaces);
2940
2214
2941
if(sb != NULL)
2215
2942
avahi_s_service_browser_free(sb);
2216
2943
2217
2944
if(mc.server != NULL)
2218
2945
avahi_server_free(mc.server);
2219
2946
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2947
if(simple_poll != NULL)
2948
avahi_simple_poll_free(simple_poll);
2222
2949
2223
2950
if(gnutls_initialized){
2224
2951
gnutls_certificate_free_credentials(mc.cred);
2236
2963
mc.current_server->prev->next = NULL;
2237
2964
while(mc.current_server != NULL){
2238
2965
server *next = mc.current_server->next;
2966
#ifdef __GNUC__
2967
#pragma GCC diagnostic push
2968
#pragma GCC diagnostic ignored "-Wcast-qual"
2969
#endif
2970
free((char *)(mc.current_server->ip));
2971
#ifdef __GNUC__
2972
#pragma GCC diagnostic pop
2973
#endif
2239
2974
free(mc.current_server);
2240
2975
mc.current_server = next;
2241
2976
}
2242
2977
}
2243
2978
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
2979
/* Re-raise privileges */
2248
2980
{
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
2981
ret_errno = raise_privileges();
2982
if(ret_errno != 0){
2983
errno = ret_errno;
2984
perror_plus("Failed to raise privileges");
2985
} else {
2986
2987
/* Run network hooks */
2988
run_network_hooks("stop", interfaces_hooks != NULL ?
2989
interfaces_hooks : "", delay);
2990
2991
/* Take down the network interfaces which were brought up */
2992
{
2993
char *interface = NULL;
2994
while((interface=argz_next(interfaces_to_take_down,
2995
interfaces_to_take_down_size,
2996
interface))){
2997
ret_errno = take_down_interface(interface);
2998
if(ret_errno != 0){
2999
errno = ret_errno;
3000
perror_plus("Failed to take down interface");
3001
}
3002
}
3003
if(debug and (interfaces_to_take_down == NULL)){
3004
fprintf_plus(stderr, "No interfaces needed to be taken"
3005
" down\n");
3006
}
3007
}
2253
3008
}
2254
3009
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
}
3010
ret_errno = lower_privileges_permanently();
3011
if(ret_errno != 0){
3012
errno = ret_errno;
3013
perror_plus("Failed to lower privileges permanently");
2271
3014
}
2272
3015
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
3016
3017
free(interfaces_to_take_down);
3018
free(interfaces_hooks);
2279
3019
2280
3020
/* Removes the GPGME temp directory and all files inside */
2281
if(tempdir_created){
3021
if(tempdir != NULL){
2282
3022
struct dirent **direntries = NULL;
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);
3023
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3024
| O_NOFOLLOW
3025
| O_DIRECTORY
3026
| O_PATH));
3027
if(tempdir_fd == -1){
3028
perror_plus("open");
3029
} else {
3030
#ifdef __GLIBC__
3031
#if __GLIBC_PREREQ(2, 15)
3032
int numentries = scandirat(tempdir_fd, ".", &direntries,
3033
notdotentries, alphasort);
3034
#else /* not __GLIBC_PREREQ(2, 15) */
3035
int numentries = scandir(tempdir, &direntries, notdotentries,
3036
alphasort);
3037
#endif /* not __GLIBC_PREREQ(2, 15) */
3038
#else /* not __GLIBC__ */
3039
int numentries = scandir(tempdir, &direntries, notdotentries,
3040
alphasort);
3041
#endif /* not __GLIBC__ */
3042
if(numentries >= 0){
3043
for(int i = 0; i < numentries; i++){
3044
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3045
if(ret == -1){
3046
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3047
" \"%s\", 0): %s\n", tempdir,
3048
direntries[i]->d_name, strerror(errno));
3049
}
3050
free(direntries[i]);
3051
}
3052
3053
/* need to clean even if 0 because man page doesn't specify */
3054
free(direntries);
3055
if(numentries == -1){
3056
perror_plus("scandir");
3057
}
3058
ret = rmdir(tempdir);
3059
if(ret == -1 and errno != ENOENT){
3060
perror_plus("rmdir");
3061
}
2302
3062
}
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");
3063
TEMP_FAILURE_RETRY(close(tempdir_fd));
2313
3064
}
2314
3065
}
2315
3066
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0