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- Committer: Teddy Hogeborn
- Date: 2014-06-08 00:13:06 UTC
- Revision ID: teddy@recompile.se-20140608001306-ums93iqhkvztj7u1
Make mandos-client use unlinkat() instead of remove().
* plugins.d/mandos-client.d (main): Replace remove() with unlinkat().
* plugins.d/mandos-client.d (main): Replace remove() with unlinkat().
- files added:
- debian/mandos-client.examples
- debian/upstream
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
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() */
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() */
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,
87
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
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() */
90
98
91
99
#ifdef __linux__
92
100
#include <sys/klog.h> /* klogctl() */
134
142
static const char sys_class_net[] = "/sys/class/net";
135
143
char *connect_to = NULL;
136
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
137
148
138
149
/* Doubly linked list that need to be circularly linked when used */
139
150
typedef struct server{
140
151
const char *ip;
141
uint16_t port;
152
in_port_t port;
142
153
AvahiIfIndex if_index;
143
154
int af;
144
155
struct timespec last_seen;
148
159
149
160
/* Used for passing in values through the Avahi callback functions */
150
161
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
162
AvahiServer *server;
153
163
gnutls_certificate_credentials_t cred;
154
164
unsigned int dh_bits;
156
166
const char *priority;
157
167
gpgme_ctx_t ctx;
158
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
159
171
} mandos_context;
160
172
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
166
175
167
176
sig_atomic_t quit_now = 0;
168
177
int signal_received = 0;
169
178
170
179
/* Function to use when printing errors */
171
180
void perror_plus(const char *print_text){
181
int e = errno;
172
182
fprintf(stderr, "Mandos plugin %s: ",
173
183
program_invocation_short_name);
184
errno = e;
174
185
perror(print_text);
175
186
}
176
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
177
189
int fprintf_plus(FILE *stream, const char *format, ...){
178
190
va_list ap;
179
191
va_start (ap, format);
180
192
181
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
194
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
196
}
185
197
186
198
/*
188
200
* bytes. "buffer_capacity" is how much is currently allocated,
189
201
* "buffer_length" is how much is already used.
190
202
*/
203
__attribute__((nonnull, warn_unused_result))
191
204
size_t incbuffer(char **buffer, size_t buffer_length,
192
205
size_t buffer_capacity){
193
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
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;
196
213
return 0;
197
214
}
215
*buffer = new_buf;
198
216
buffer_capacity += BUFFER_SIZE;
199
217
}
200
218
return buffer_capacity;
201
219
}
202
220
203
221
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
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){
206
225
int ret;
207
226
server *new_server = malloc(sizeof(server));
208
227
if(new_server == NULL){
209
228
perror_plus("malloc");
210
return -1;
229
return false;
211
230
}
212
231
*new_server = (server){ .ip = strdup(ip),
213
232
.port = port,
215
234
.af = af };
216
235
if(new_server->ip == NULL){
217
236
perror_plus("strdup");
218
return -1;
237
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
219
243
}
220
244
/* Special case of first server */
221
if (mc.current_server == NULL){
245
if(*current_server == NULL){
222
246
new_server->next = new_server;
223
247
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
248
*current_server = new_server;
226
249
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
229
253
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
254
(*current_server)->prev = new_server;
255
}
256
return true;
238
257
}
239
258
240
259
/*
241
260
* Initialize GPGME.
242
261
*/
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
245
267
gpgme_error_t rc;
246
268
gpgme_engine_info_t engine_info;
247
269
248
249
270
/*
250
271
* Helper function to insert pub and seckey to the engine keyring.
251
272
*/
252
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
253
274
int ret;
254
275
int fd;
255
276
gpgme_data_t pgp_data;
267
288
return false;
268
289
}
269
290
270
rc = gpgme_op_import(mc.ctx, pgp_data);
291
rc = gpgme_op_import(mc->ctx, pgp_data);
271
292
if(rc != GPG_ERR_NO_ERROR){
272
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
294
gpgme_strsource(rc), gpgme_strerror(rc));
317
338
}
318
339
319
340
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
341
rc = gpgme_new(&(mc->ctx));
321
342
if(rc != GPG_ERR_NO_ERROR){
322
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
336
357
* Decrypt OpenPGP data.
337
358
* Returns -1 on error
338
359
*/
360
__attribute__((nonnull, warn_unused_result))
339
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
340
362
size_t crypto_size,
341
char **plaintext){
363
char **plaintext,
364
mandos_context *mc){
342
365
gpgme_data_t dh_crypto, dh_plain;
343
366
gpgme_error_t rc;
344
367
ssize_t ret;
370
393
371
394
/* Decrypt data from the cryptotext data buffer to the plaintext
372
395
data buffer */
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
397
if(rc != GPG_ERR_NO_ERROR){
375
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
399
gpgme_strsource(rc), gpgme_strerror(rc));
377
400
plaintext_length = -1;
378
401
if(debug){
379
402
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
403
result = gpgme_op_decrypt_result(mc->ctx);
381
404
if(result == NULL){
382
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
406
} else {
460
483
return plaintext_length;
461
484
}
462
485
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
466
489
if(ret == NULL)
467
490
ret = "(unknown)";
468
491
return ret;
469
492
}
470
493
471
494
/* GnuTLS log function callback */
495
__attribute__((nonnull))
472
496
static void debuggnutls(__attribute__((unused)) int level,
473
497
const char* string){
474
498
fprintf_plus(stderr, "GnuTLS: %s", string);
475
499
}
476
500
501
__attribute__((nonnull, warn_unused_result))
477
502
static int init_gnutls_global(const char *pubkeyfilename,
478
const char *seckeyfilename){
503
const char *seckeyfilename,
504
mandos_context *mc){
479
505
int ret;
480
506
481
507
if(debug){
498
524
}
499
525
500
526
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
528
if(ret != GNUTLS_E_SUCCESS){
503
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
530
safer_gnutls_strerror(ret));
514
540
}
515
541
516
542
ret = gnutls_certificate_set_openpgp_key_file
517
(mc.cred, pubkeyfilename, seckeyfilename,
543
(mc->cred, pubkeyfilename, seckeyfilename,
518
544
GNUTLS_OPENPGP_FMT_BASE64);
519
545
if(ret != GNUTLS_E_SUCCESS){
520
546
fprintf_plus(stderr,
526
552
}
527
553
528
554
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
555
ret = gnutls_dh_params_init(&mc->dh_params);
530
556
if(ret != GNUTLS_E_SUCCESS){
531
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
558
" initialization: %s\n",
533
559
safer_gnutls_strerror(ret));
534
560
goto globalfail;
535
561
}
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
563
if(ret != GNUTLS_E_SUCCESS){
538
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
565
safer_gnutls_strerror(ret));
540
566
goto globalfail;
541
567
}
542
568
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
570
545
571
return 0;
546
572
547
573
globalfail:
548
574
549
gnutls_certificate_free_credentials(mc.cred);
575
gnutls_certificate_free_credentials(mc->cred);
550
576
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
577
gnutls_dh_params_deinit(mc->dh_params);
552
578
return -1;
553
579
}
554
580
555
static int init_gnutls_session(gnutls_session_t *session){
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
556
584
int ret;
557
585
/* GnuTLS session creation */
558
586
do {
570
598
{
571
599
const char *err;
572
600
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
602
if(quit_now){
575
603
gnutls_deinit(*session);
576
604
return -1;
587
615
588
616
do {
589
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
618
mc->cred);
591
619
if(quit_now){
592
620
gnutls_deinit(*session);
593
621
return -1;
603
631
/* ignore client certificate if any. */
604
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
605
633
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
635
608
636
return 0;
609
637
}
613
641
__attribute__((unused)) const char *txt){}
614
642
615
643
/* Called when a Mandos server is found */
616
static int start_mandos_communication(const char *ip, uint16_t port,
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
617
646
AvahiIfIndex if_index,
618
int af){
647
int af, mandos_context *mc){
619
648
int ret, tcp_sd = -1;
620
649
ssize_t sret;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
650
struct sockaddr_storage to;
625
651
char *buffer = NULL;
626
652
char *decrypted_buffer = NULL;
627
653
size_t buffer_length = 0;
651
677
return -1;
652
678
}
653
679
654
ret = init_gnutls_session(&session);
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
708
return -1;
709
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
655
713
if(ret != 0){
656
714
return -1;
657
715
}
658
716
659
717
if(debug){
660
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
719
PRIuMAX "\n", ip, (uintmax_t)port);
662
720
}
663
721
664
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
676
734
677
735
memset(&to, 0, sizeof(to));
678
736
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
681
739
} else { /* IPv4 */
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
684
742
}
685
743
if(ret < 0 ){
686
744
int e = errno;
695
753
goto mandos_end;
696
754
}
697
755
if(af == AF_INET6){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
705
759
if(if_index == AVAHI_IF_UNSPEC){
706
760
fprintf_plus(stderr, "An IPv6 link-local address is"
707
761
" incomplete without a network interface\n");
709
763
goto mandos_end;
710
764
}
711
765
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
767
}
714
768
} else {
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
718
770
}
719
771
720
772
if(quit_now){
728
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
781
perror_plus("if_indextoname");
730
782
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
733
785
}
734
786
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
737
789
}
738
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
741
792
if(af == AF_INET6){
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
744
797
} else {
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
747
802
}
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
809
}
755
810
}
756
811
760
815
}
761
816
762
817
if(af == AF_INET6){
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
764
820
} else {
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
766
823
}
767
824
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
826
int e = errno;
770
827
perror_plus("connect");
771
828
errno = e;
817
874
goto mandos_end;
818
875
}
819
876
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
822
882
823
883
if(quit_now){
824
884
errno = EINTR;
929
989
if(buffer_length > 0){
930
990
ssize_t decrypted_buffer_size;
931
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
932
&decrypted_buffer);
992
&decrypted_buffer, mc);
933
993
if(decrypted_buffer_size >= 0){
934
994
935
995
written = 0;
983
1043
return retval;
984
1044
}
985
1045
1046
__attribute__((nonnull))
986
1047
static void resolve_callback(AvahiSServiceResolver *r,
987
1048
AvahiIfIndex interface,
988
1049
AvahiProtocol proto,
996
1057
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
1058
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
1059
flags,
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
1001
1064
1002
1065
/* Called whenever a service has been resolved successfully or
1003
1066
timed out */
1012
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
1077
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
1016
1080
break;
1017
1081
1018
1082
case AVAHI_RESOLVER_FOUND:
1024
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
1089
host_name, ip, (intmax_t)interface, port);
1026
1090
}
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1029
1095
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1096
avahi_simple_poll_quit(simple_poll);
1031
1097
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
1034
1104
}
1035
1105
}
1036
1106
}
1046
1116
const char *domain,
1047
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
1118
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1051
1123
1052
1124
/* Called whenever a new services becomes available on the LAN or
1053
1125
is removed from the LAN */
1061
1133
case AVAHI_BROWSER_FAILURE:
1062
1134
1063
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1066
1139
return;
1067
1140
1068
1141
case AVAHI_BROWSER_NEW:
1071
1144
the callback function is called the Avahi server will free the
1072
1145
resolver for us. */
1073
1146
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1077
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
1152
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
1080
1155
break;
1081
1156
1082
1157
case AVAHI_BROWSER_REMOVE:
1101
1176
signal_received = sig;
1102
1177
int old_errno = errno;
1103
1178
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1106
1181
}
1107
1182
errno = old_errno;
1108
1183
}
1109
1184
1185
__attribute__((nonnull, warn_unused_result))
1110
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
1187
int ret;
1188
error_t ret_errno;
1112
1189
1113
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
1191
if(s < 0){
1192
ret_errno = errno;
1115
1193
perror_plus("socket");
1194
errno = ret_errno;
1116
1195
return false;
1117
1196
}
1118
1197
strcpy(ifr->ifr_name, ifname);
1119
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
1199
if(ret == -1){
1121
1200
if(debug){
1201
ret_errno = errno;
1122
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1123
1204
}
1124
1205
return false;
1125
1206
}
1126
1207
return true;
1127
1208
}
1128
1209
1210
__attribute__((nonnull, warn_unused_result))
1129
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1212
1131
1213
/* Reject the loopback device */
1173
1255
* corresponds to an acceptable network device.
1174
1256
* (This function is passed to scandir(3) as a filter function.)
1175
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1176
1259
int good_interface(const struct dirent *if_entry){
1177
1260
if(if_entry->d_name[0] == '.'){
1178
1261
return 0;
1194
1277
}
1195
1278
1196
1279
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1239
1314
int notdotentries(const struct dirent *direntry){
1240
1315
/* Skip "." and ".." */
1241
1316
if(direntry->d_name[0] == '.'
1248
1323
}
1249
1324
1250
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1251
1327
int runnable_hook(const struct dirent *direntry){
1252
1328
int ret;
1253
1329
size_t sret;
1261
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
1338
"abcdefghijklmnopqrstuvwxyz"
1263
1339
"0123456789"
1264
"_-");
1340
"_.-");
1265
1341
if((direntry->d_name)[sret] != '\0'){
1266
1342
/* Contains non-allowed characters */
1267
1343
if(debug){
1271
1347
return 0;
1272
1348
}
1273
1349
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1282
1351
if(ret == -1){
1283
1352
if(debug){
1284
1353
perror_plus("Could not stat hook");
1301
1370
}
1302
1371
return 0;
1303
1372
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1304
1377
return 1;
1305
1378
}
1306
1379
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1308
1383
int ret;
1309
1384
struct timespec now;
1310
1385
struct timespec waited_time;
1311
1386
intmax_t block_time;
1312
1387
1313
1388
while(true){
1314
if(mc.current_server == NULL){
1315
if (debug){
1389
if(mc->current_server == NULL){
1390
if(debug){
1316
1391
fprintf_plus(stderr, "Wait until first server is found."
1317
1392
" No timeout!\n");
1318
1393
}
1319
1394
ret = avahi_simple_poll_iterate(s, -1);
1320
1395
} else {
1321
if (debug){
1396
if(debug){
1322
1397
fprintf_plus(stderr, "Check current_server if we should run"
1323
1398
" it, or wait\n");
1324
1399
}
1331
1406
/* Calculating in ms how long time between now and server
1332
1407
who we visted longest time ago. Now - last seen. */
1333
1408
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1409
- mc->current_server->last_seen.tv_sec);
1335
1410
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1411
- mc->current_server->last_seen.tv_nsec);
1337
1412
/* total time is 10s/10,000ms.
1338
1413
Converting to s from ms by dividing by 1,000,
1339
1414
and ns to ms by dividing by 1,000,000. */
1341
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1342
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1343
1418
1344
if (debug){
1419
if(debug){
1345
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1346
1421
block_time);
1347
1422
}
1348
1423
1349
1424
if(block_time <= 0){
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1354
1429
if(ret == 0){
1355
avahi_simple_poll_quit(mc.simple_poll);
1430
avahi_simple_poll_quit(s);
1356
1431
return 0;
1357
1432
}
1358
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1434
&mc->current_server->last_seen);
1360
1435
if(ret == -1){
1361
1436
perror_plus("clock_gettime");
1362
1437
return -1;
1363
1438
}
1364
mc.current_server = mc.current_server->next;
1439
mc->current_server = mc->current_server->next;
1365
1440
block_time = 0; /* Call avahi to find new Mandos
1366
1441
servers, but don't block */
1367
1442
}
1369
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1370
1445
}
1371
1446
if(ret != 0){
1372
if (ret > 0 or errno != EINTR){
1447
if(ret > 0 or errno != EINTR){
1373
1448
return (ret != 1) ? ret : 0;
1374
1449
}
1375
1450
}
1376
1451
}
1377
1452
}
1378
1453
1379
bool run_network_hooks(const char *mode, const char *interface,
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
#ifndef O_CLOEXEC
1511
/*
1512
* Based on the example in the GNU LibC manual chapter 13.13 "File
1513
* Descriptor Flags".
1514
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1515
*/
1516
__attribute__((warn_unused_result))
1517
static int set_cloexec_flag(int fd){
1518
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1519
/* If reading the flags failed, return error indication now. */
1520
if(ret < 0){
1521
return ret;
1522
}
1523
/* Store modified flag word in the descriptor. */
1524
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1525
ret | FD_CLOEXEC));
1526
}
1527
#endif /* not O_CLOEXEC */
1528
1529
__attribute__((nonnull))
1530
void run_network_hooks(const char *mode, const char *interface,
1380
1531
const float delay){
1381
1532
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
alphasort);
1533
if(hookdir_fd == -1){
1534
hookdir_fd = open(hookdir, O_RDONLY |
1535
#ifdef O_CLOEXEC
1536
O_CLOEXEC
1537
#else /* not O_CLOEXEC */
1538
0
1539
#endif /* not O_CLOEXEC */
1540
);
1541
if(hookdir_fd == -1){
1542
if(errno == ENOENT){
1543
if(debug){
1544
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1545
" found\n", hookdir);
1546
}
1547
} else {
1548
perror_plus("open");
1549
}
1550
return;
1551
}
1552
#ifndef O_CLOEXEC
1553
if(set_cloexec_flag(hookdir_fd) < 0){
1554
perror_plus("set_cloexec_flag");
1555
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1556
perror_plus("close");
1557
} else {
1558
hookdir_fd = -1;
1559
}
1560
return;
1561
}
1562
#endif /* not O_CLOEXEC */
1563
}
1564
#ifdef __GLIBC__
1565
#if __GLIBC_PREREQ(2, 15)
1566
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1567
runnable_hook, alphasort);
1568
#else /* not __GLIBC_PREREQ(2, 15) */
1569
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1570
alphasort);
1571
#endif /* not __GLIBC_PREREQ(2, 15) */
1572
#else /* not __GLIBC__ */
1573
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1574
alphasort);
1575
#endif /* not __GLIBC__ */
1386
1576
if(numhooks == -1){
1387
1577
perror_plus("scandir");
1388
} else {
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
if(ret < 0){
1578
return;
1579
}
1580
struct dirent *direntry;
1581
int ret;
1582
int devnull = open("/dev/null", O_RDONLY);
1583
for(int i = 0; i < numhooks; i++){
1584
direntry = direntries[i];
1585
if(debug){
1586
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1587
direntry->d_name);
1588
}
1589
pid_t hook_pid = fork();
1590
if(hook_pid == 0){
1591
/* Child */
1592
/* Raise privileges */
1593
if(raise_privileges_permanently() != 0){
1594
perror_plus("Failed to raise privileges");
1595
_exit(EX_NOPERM);
1596
}
1597
/* Set group */
1598
errno = 0;
1599
ret = setgid(0);
1600
if(ret == -1){
1601
perror_plus("setgid");
1602
_exit(EX_NOPERM);
1603
}
1604
/* Reset supplementary groups */
1605
errno = 0;
1606
ret = setgroups(0, NULL);
1607
if(ret == -1){
1608
perror_plus("setgroups");
1609
_exit(EX_NOPERM);
1610
}
1611
ret = dup2(devnull, STDIN_FILENO);
1612
if(ret == -1){
1613
perror_plus("dup2(devnull, STDIN_FILENO)");
1614
_exit(EX_OSERR);
1615
}
1616
ret = close(devnull);
1617
if(ret == -1){
1618
perror_plus("close");
1619
_exit(EX_OSERR);
1620
}
1621
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1622
if(ret == -1){
1623
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1624
_exit(EX_OSERR);
1625
}
1626
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1627
if(ret == -1){
1628
perror_plus("setenv");
1629
_exit(EX_OSERR);
1630
}
1631
ret = setenv("DEVICE", interface, 1);
1632
if(ret == -1){
1633
perror_plus("setenv");
1634
_exit(EX_OSERR);
1635
}
1636
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1637
if(ret == -1){
1638
perror_plus("setenv");
1639
_exit(EX_OSERR);
1640
}
1641
ret = setenv("MODE", mode, 1);
1642
if(ret == -1){
1643
perror_plus("setenv");
1644
_exit(EX_OSERR);
1645
}
1646
char *delaystring;
1647
ret = asprintf(&delaystring, "%f", (double)delay);
1648
if(ret == -1){
1395
1649
perror_plus("asprintf");
1396
continue;
1650
_exit(EX_OSERR);
1397
1651
}
1398
pid_t hook_pid = fork();
1399
if(hook_pid == 0){
1400
/* Child */
1401
dup2(devnull, STDIN_FILENO);
1402
close(devnull);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1405
if(ret == -1){
1406
perror_plus("setenv");
1407
return false;
1408
}
1409
ret = setenv("DEVICE", interface, 1);
1410
if(ret == -1){
1411
perror_plus("setenv");
1412
return false;
1413
}
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1415
if(ret == -1){
1416
perror_plus("setenv");
1417
return false;
1418
}
1419
ret = setenv("MODE", mode, 1);
1420
if(ret == -1){
1421
perror_plus("setenv");
1422
return false;
1423
}
1424
char *delaystring;
1425
ret = asprintf(&delaystring, "%f", delay);
1426
if(ret == -1){
1427
perror_plus("asprintf");
1428
return false;
1429
}
1430
ret = setenv("DELAY", delaystring, 1);
1431
if(ret == -1){
1432
free(delaystring);
1433
perror_plus("setenv");
1434
return false;
1435
}
1652
ret = setenv("DELAY", delaystring, 1);
1653
if(ret == -1){
1436
1654
free(delaystring);
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1439
} else {
1440
int status;
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1442
perror_plus("waitpid");
1443
free(fullname);
1444
continue;
1445
}
1446
if(WIFEXITED(status)){
1447
if(WEXITSTATUS(status) != 0){
1448
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1449
" with status %d\n", direntry->d_name,
1450
WEXITSTATUS(status));
1451
free(fullname);
1452
continue;
1453
}
1454
} else if(WIFSIGNALED(status)){
1455
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1456
" signal %d\n", direntry->d_name,
1457
WTERMSIG(status));
1458
free(fullname);
1459
continue;
1460
} else {
1461
fprintf_plus(stderr, "Warning: network hook \"%s\""
1462
" crashed\n", direntry->d_name);
1463
free(fullname);
1464
continue;
1465
}
1466
}
1467
free(fullname);
1468
if(quit_now){
1469
break;
1470
}
1471
}
1472
close(devnull);
1473
}
1474
return true;
1655
perror_plus("setenv");
1656
_exit(EX_OSERR);
1657
}
1658
free(delaystring);
1659
if(connect_to != NULL){
1660
ret = setenv("CONNECT", connect_to, 1);
1661
if(ret == -1){
1662
perror_plus("setenv");
1663
_exit(EX_OSERR);
1664
}
1665
}
1666
if(fexecve(hookdir_fd, (char *const [])
1667
{ direntry->d_name, NULL }, environ) == -1){
1668
perror_plus("fexecve");
1669
_exit(EXIT_FAILURE);
1670
}
1671
} else {
1672
int status;
1673
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1674
perror_plus("waitpid");
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
continue;
1683
}
1684
} else if(WIFSIGNALED(status)){
1685
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1686
" signal %d\n", direntry->d_name,
1687
WTERMSIG(status));
1688
continue;
1689
} else {
1690
fprintf_plus(stderr, "Warning: network hook \"%s\""
1691
" crashed\n", direntry->d_name);
1692
continue;
1693
}
1694
}
1695
if(debug){
1696
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1697
direntry->d_name);
1698
}
1699
}
1700
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1701
perror_plus("close");
1702
} else {
1703
hookdir_fd = -1;
1704
}
1705
close(devnull);
1706
}
1707
1708
__attribute__((nonnull, warn_unused_result))
1709
error_t bring_up_interface(const char *const interface,
1710
const float delay){
1711
error_t old_errno = errno;
1712
int ret;
1713
struct ifreq network;
1714
unsigned int if_index = if_nametoindex(interface);
1715
if(if_index == 0){
1716
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1717
errno = old_errno;
1718
return ENXIO;
1719
}
1720
1721
if(quit_now){
1722
errno = old_errno;
1723
return EINTR;
1724
}
1725
1726
if(not interface_is_up(interface)){
1727
error_t ret_errno = 0, ioctl_errno = 0;
1728
if(not get_flags(interface, &network)){
1729
ret_errno = errno;
1730
fprintf_plus(stderr, "Failed to get flags for interface "
1731
"\"%s\"\n", interface);
1732
errno = old_errno;
1733
return ret_errno;
1734
}
1735
network.ifr_flags |= IFF_UP; /* set flag */
1736
1737
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1738
if(sd == -1){
1739
ret_errno = errno;
1740
perror_plus("socket");
1741
errno = old_errno;
1742
return ret_errno;
1743
}
1744
1745
if(quit_now){
1746
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1747
if(ret == -1){
1748
perror_plus("close");
1749
}
1750
errno = old_errno;
1751
return EINTR;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise privileges */
1760
ret_errno = raise_privileges();
1761
if(ret_errno != 0){
1762
perror_plus("Failed to raise privileges");
1763
}
1764
1765
#ifdef __linux__
1766
int ret_linux;
1767
bool restore_loglevel = false;
1768
if(ret_errno == 0){
1769
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1770
messages about the network interface to mess up the prompt */
1771
ret_linux = klogctl(8, NULL, 5);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1774
} else {
1775
restore_loglevel = true;
1776
}
1777
}
1778
#endif /* __linux__ */
1779
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1780
ioctl_errno = errno;
1781
#ifdef __linux__
1782
if(restore_loglevel){
1783
ret_linux = klogctl(7, NULL, 0);
1784
if(ret_linux == -1){
1785
perror_plus("klogctl");
1786
}
1787
}
1788
#endif /* __linux__ */
1789
1790
/* If raise_privileges() succeeded above */
1791
if(ret_errno == 0){
1792
/* Lower privileges */
1793
ret_errno = lower_privileges();
1794
if(ret_errno != 0){
1795
errno = ret_errno;
1796
perror_plus("Failed to lower privileges");
1797
}
1798
}
1799
1800
/* Close the socket */
1801
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1802
if(ret == -1){
1803
perror_plus("close");
1804
}
1805
1806
if(ret_setflags == -1){
1807
errno = ioctl_errno;
1808
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1809
errno = old_errno;
1810
return ioctl_errno;
1811
}
1812
} else if(debug){
1813
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1814
interface);
1815
}
1816
1817
/* Sleep checking until interface is running.
1818
Check every 0.25s, up to total time of delay */
1819
for(int i=0; i < delay * 4; i++){
1820
if(interface_is_running(interface)){
1821
break;
1822
}
1823
struct timespec sleeptime = { .tv_nsec = 250000000 };
1824
ret = nanosleep(&sleeptime, NULL);
1825
if(ret == -1 and errno != EINTR){
1826
perror_plus("nanosleep");
1827
}
1828
}
1829
1830
errno = old_errno;
1831
return 0;
1832
}
1833
1834
__attribute__((nonnull, warn_unused_result))
1835
error_t take_down_interface(const char *const interface){
1836
error_t old_errno = errno;
1837
struct ifreq network;
1838
unsigned int if_index = if_nametoindex(interface);
1839
if(if_index == 0){
1840
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1841
errno = old_errno;
1842
return ENXIO;
1843
}
1844
if(interface_is_up(interface)){
1845
error_t ret_errno = 0, ioctl_errno = 0;
1846
if(not get_flags(interface, &network) and debug){
1847
ret_errno = errno;
1848
fprintf_plus(stderr, "Failed to get flags for interface "
1849
"\"%s\"\n", interface);
1850
errno = old_errno;
1851
return ret_errno;
1852
}
1853
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1854
1855
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1856
if(sd == -1){
1857
ret_errno = errno;
1858
perror_plus("socket");
1859
errno = old_errno;
1860
return ret_errno;
1861
}
1862
1863
if(debug){
1864
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1865
interface);
1866
}
1867
1868
/* Raise privileges */
1869
ret_errno = raise_privileges();
1870
if(ret_errno != 0){
1871
perror_plus("Failed to raise privileges");
1872
}
1873
1874
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1875
ioctl_errno = errno;
1876
1877
/* If raise_privileges() succeeded above */
1878
if(ret_errno == 0){
1879
/* Lower privileges */
1880
ret_errno = lower_privileges();
1881
if(ret_errno != 0){
1882
errno = ret_errno;
1883
perror_plus("Failed to lower privileges");
1884
}
1885
}
1886
1887
/* Close the socket */
1888
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1889
if(ret == -1){
1890
perror_plus("close");
1891
}
1892
1893
if(ret_setflags == -1){
1894
errno = ioctl_errno;
1895
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1896
errno = old_errno;
1897
return ioctl_errno;
1898
}
1899
} else if(debug){
1900
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1901
interface);
1902
}
1903
1904
errno = old_errno;
1905
return 0;
1475
1906
}
1476
1907
1477
1908
int main(int argc, char *argv[]){
1909
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1910
.priority = "SECURE256:!CTYPE-X.509:"
1911
"+CTYPE-OPENPGP", .current_server = NULL,
1912
.interfaces = NULL, .interfaces_size = 0 };
1478
1913
AvahiSServiceBrowser *sb = NULL;
1479
int error;
1914
error_t ret_errno;
1480
1915
int ret;
1481
1916
intmax_t tmpmax;
1482
1917
char *tmp;
1483
1918
int exitcode = EXIT_SUCCESS;
1484
const char *interface = "";
1485
struct ifreq network;
1486
int sd = -1;
1487
bool take_down_interface = false;
1488
uid_t uid;
1489
gid_t gid;
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1491
bool tempdir_created = false;
1919
char *interfaces_to_take_down = NULL;
1920
size_t interfaces_to_take_down_size = 0;
1921
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1922
char old_tempdir[] = "/tmp/mandosXXXXXX";
1923
char *tempdir = NULL;
1492
1924
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1493
1925
const char *seckey = PATHDIR "/" SECKEY;
1494
1926
const char *pubkey = PATHDIR "/" PUBKEY;
1927
char *interfaces_hooks = NULL;
1495
1928
1496
1929
bool gnutls_initialized = false;
1497
1930
bool gpgme_initialized = false;
1559
1992
.group = 2 },
1560
1993
{ .name = "retry", .key = 132,
1561
1994
.arg = "SECONDS",
1562
.doc = "Retry interval used when denied by the mandos server",
1995
.doc = "Retry interval used when denied by the Mandos server",
1563
1996
.group = 2 },
1564
1997
{ .name = "network-hook-dir", .key = 133,
1565
1998
.arg = "DIR",
1588
2021
connect_to = arg;
1589
2022
break;
1590
2023
case 'i': /* --interface */
1591
interface = arg;
2024
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2025
arg, (int)',');
2026
if(ret_errno != 0){
2027
argp_error(state, "%s", strerror(ret_errno));
2028
}
1592
2029
break;
1593
2030
case 's': /* --seckey */
1594
2031
seckey = arg;
1637
2074
argp_state_help(state, state->out_stream,
1638
2075
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1639
2076
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
2077
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1643
2078
exit(argp_err_exit_status);
1644
2079
break;
1672
2107
{
1673
2108
/* Work around Debian bug #633582:
1674
2109
<http://bugs.debian.org/633582> */
1675
struct stat st;
1676
1677
/* Re-raise priviliges */
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2110
2111
/* Re-raise privileges */
2112
ret_errno = raise_privileges();
2113
if(ret_errno != 0){
2114
errno = ret_errno;
2115
perror_plus("Failed to raise privileges");
2116
} else {
2117
struct stat st;
2118
2119
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2120
int seckey_fd = open(seckey, O_RDONLY);
2121
if(seckey_fd == -1){
2122
perror_plus("open");
2123
} else {
2124
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2125
if(ret == -1){
2126
perror_plus("fstat");
2127
} else {
2128
if(S_ISREG(st.st_mode)
2129
and st.st_uid == 0 and st.st_gid == 0){
2130
ret = fchown(seckey_fd, uid, gid);
2131
if(ret == -1){
2132
perror_plus("fchown");
2133
}
2134
}
2135
}
2136
TEMP_FAILURE_RETRY(close(seckey_fd));
2137
}
2138
}
2139
2140
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2141
int pubkey_fd = open(pubkey, O_RDONLY);
2142
if(pubkey_fd == -1){
2143
perror_plus("open");
2144
} else {
2145
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2146
if(ret == -1){
2147
perror_plus("fstat");
2148
} else {
2149
if(S_ISREG(st.st_mode)
2150
and st.st_uid == 0 and st.st_gid == 0){
2151
ret = fchown(pubkey_fd, uid, gid);
2152
if(ret == -1){
2153
perror_plus("fchown");
2154
}
2155
}
2156
}
2157
TEMP_FAILURE_RETRY(close(pubkey_fd));
2158
}
2159
}
2160
2161
/* Lower privileges */
2162
ret_errno = lower_privileges();
2163
if(ret_errno != 0){
2164
errno = ret_errno;
2165
perror_plus("Failed to lower privileges");
2166
}
2167
}
2168
}
2169
2170
/* Remove invalid interface names (except "none") */
2171
{
2172
char *interface = NULL;
2173
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2174
interface))){
2175
if(strcmp(interface, "none") != 0
2176
and if_nametoindex(interface) == 0){
2177
if(interface[0] != '\0'){
2178
fprintf_plus(stderr, "Not using nonexisting interface"
2179
" \"%s\"\n", interface);
2180
}
2181
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2182
interface = NULL;
2183
}
1731
2184
}
1732
2185
}
1733
2186
1734
2187
/* Run network hooks */
1735
2188
{
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
1741
}
1742
if(not run_network_hooks("start", interface, delay)){
1743
goto end;
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
2189
if(mc.interfaces != NULL){
2190
interfaces_hooks = malloc(mc.interfaces_size);
2191
if(interfaces_hooks == NULL){
2192
perror_plus("malloc");
2193
goto end;
2194
}
2195
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2196
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2197
}
2198
run_network_hooks("start", interfaces_hooks != NULL ?
2199
interfaces_hooks : "", delay);
1751
2200
}
1752
2201
1753
2202
if(not debug){
1754
2203
avahi_set_log_function(empty_log);
1755
2204
}
1756
2205
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
1789
2206
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1790
2207
from the signal handler */
1791
2208
/* Initialize the pseudo-RNG for Avahi */
1792
2209
srand((unsigned int) time(NULL));
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2210
simple_poll = avahi_simple_poll_new();
2211
if(simple_poll == NULL){
1795
2212
fprintf_plus(stderr,
1796
2213
"Avahi: Failed to create simple poll object.\n");
1797
2214
exitcode = EX_UNAVAILABLE;
1861
2278
}
1862
2279
}
1863
2280
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1870
goto end;
1871
}
1872
1873
if(quit_now){
1874
goto end;
1875
}
1876
1877
/* Re-raise priviliges */
1878
errno = 0;
1879
ret = seteuid(0);
1880
if(ret == -1){
1881
perror_plus("seteuid");
1882
}
1883
1884
#ifdef __linux__
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1889
if(ret == -1){
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1892
}
1893
#endif /* __linux__ */
1894
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1899
#ifdef __linux__
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1902
if(ret == -1){
1903
perror_plus("klogctl");
1904
}
1905
}
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1908
errno = 0;
1909
ret = seteuid(uid);
1910
if(ret == -1){
1911
perror_plus("seteuid");
1912
}
1913
goto end;
1914
}
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1919
#ifdef __linux__
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1922
if(ret == -1){
1923
perror_plus("klogctl");
1924
}
1925
}
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
if(ret == -1){
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
2281
/* If no interfaces were specified, make a list */
2282
if(mc.interfaces == NULL){
2283
struct dirent **direntries;
2284
/* Look for any good interfaces */
2285
ret = scandir(sys_class_net, &direntries, good_interface,
2286
alphasort);
2287
if(ret >= 1){
2288
/* Add all found interfaces to interfaces list */
2289
for(int i = 0; i < ret; ++i){
2290
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2291
direntries[i]->d_name);
2292
if(ret_errno != 0){
2293
errno = ret_errno;
2294
perror_plus("argz_add");
2295
continue;
2296
}
2297
if(debug){
2298
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2299
direntries[i]->d_name);
2300
}
2301
}
2302
free(direntries);
2303
} else {
2304
free(direntries);
2305
fprintf_plus(stderr, "Could not find a network interface\n");
2306
exitcode = EXIT_FAILURE;
2307
goto end;
2308
}
2309
}
2310
2311
/* Bring up interfaces which are down, and remove any "none"s */
2312
{
2313
char *interface = NULL;
2314
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2315
interface))){
2316
/* If interface name is "none", stop bringing up interfaces.
2317
Also remove all instances of "none" from the list */
2318
if(strcmp(interface, "none") == 0){
2319
argz_delete(&mc.interfaces, &mc.interfaces_size,
2320
interface);
2321
interface = NULL;
2322
while((interface = argz_next(mc.interfaces,
2323
mc.interfaces_size, interface))){
2324
if(strcmp(interface, "none") == 0){
2325
argz_delete(&mc.interfaces, &mc.interfaces_size,
2326
interface);
2327
interface = NULL;
1949
2328
}
1950
2329
}
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
1968
2330
break;
1969
2331
}
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1974
}
1975
}
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
}
1983
#ifdef __linux__
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1987
if(ret == -1){
1988
perror_plus("klogctl");
1989
}
1990
}
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1993
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1998
}
2332
bool interface_was_up = interface_is_up(interface);
2333
errno = bring_up_interface(interface, delay);
2334
if(not interface_was_up){
2335
if(errno != 0){
2336
perror_plus("Failed to bring up interface");
2337
} else {
2338
errno = argz_add(&interfaces_to_take_down,
2339
&interfaces_to_take_down_size,
2340
interface);
2341
if(errno != 0){
2342
perror_plus("argz_add");
2343
}
2344
}
2345
}
2346
}
2347
if(debug and (interfaces_to_take_down == NULL)){
2348
fprintf_plus(stderr, "No interfaces were brought up\n");
2349
}
2350
}
2351
2352
/* If we only got one interface, explicitly use only that one */
2353
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2354
if(debug){
2355
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2356
mc.interfaces);
2357
}
2358
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1999
2359
}
2000
2360
2001
2361
if(quit_now){
2002
2362
goto end;
2003
2363
}
2004
2364
2005
ret = init_gnutls_global(pubkey, seckey);
2365
ret = init_gnutls_global(pubkey, seckey, &mc);
2006
2366
if(ret == -1){
2007
2367
fprintf_plus(stderr, "init_gnutls_global failed\n");
2008
2368
exitcode = EX_UNAVAILABLE;
2015
2375
goto end;
2016
2376
}
2017
2377
2018
if(mkdtemp(tempdir) == NULL){
2378
/* Try /run/tmp before /tmp */
2379
tempdir = mkdtemp(run_tempdir);
2380
if(tempdir == NULL and errno == ENOENT){
2381
if(debug){
2382
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2383
run_tempdir, old_tempdir);
2384
}
2385
tempdir = mkdtemp(old_tempdir);
2386
}
2387
if(tempdir == NULL){
2019
2388
perror_plus("mkdtemp");
2020
2389
goto end;
2021
2390
}
2022
tempdir_created = true;
2023
2391
2024
2392
if(quit_now){
2025
2393
goto end;
2026
2394
}
2027
2395
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2396
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2029
2397
fprintf_plus(stderr, "init_gpgme failed\n");
2030
2398
exitcode = EX_UNAVAILABLE;
2031
2399
goto end;
2041
2409
/* Connect directly, do not use Zeroconf */
2042
2410
/* (Mainly meant for debugging) */
2043
2411
char *address = strrchr(connect_to, ':');
2412
2044
2413
if(address == NULL){
2045
2414
fprintf_plus(stderr, "No colon in address\n");
2046
2415
exitcode = EX_USAGE;
2051
2420
goto end;
2052
2421
}
2053
2422
2054
uint16_t port;
2423
in_port_t port;
2055
2424
errno = 0;
2056
2425
tmpmax = strtoimax(address+1, &tmp, 10);
2057
2426
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2058
or tmpmax != (uint16_t)tmpmax){
2427
or tmpmax != (in_port_t)tmpmax){
2059
2428
fprintf_plus(stderr, "Bad port number\n");
2060
2429
exitcode = EX_USAGE;
2061
2430
goto end;
2062
2431
}
2063
2432
2064
2433
if(quit_now){
2065
2434
goto end;
2066
2435
}
2067
2436
2068
port = (uint16_t)tmpmax;
2437
port = (in_port_t)tmpmax;
2069
2438
*address = '\0';
2070
2439
/* Colon in address indicates IPv6 */
2071
2440
int af;
2087
2456
}
2088
2457
2089
2458
while(not quit_now){
2090
ret = start_mandos_communication(address, port, if_index, af);
2459
ret = start_mandos_communication(address, port, if_index, af,
2460
&mc);
2091
2461
if(quit_now or ret == 0){
2092
2462
break;
2093
2463
}
2095
2465
fprintf_plus(stderr, "Retrying in %d seconds\n",
2096
2466
(int)retry_interval);
2097
2467
}
2098
sleep((int)retry_interval);
2468
sleep((unsigned int)retry_interval);
2099
2469
}
2100
2470
2101
if (not quit_now){
2471
if(not quit_now){
2102
2472
exitcode = EXIT_SUCCESS;
2103
2473
}
2104
2474
2119
2489
config.publish_domain = 0;
2120
2490
2121
2491
/* Allocate a new server */
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2492
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2493
&config, NULL, NULL, &ret_errno);
2125
2494
2126
2495
/* Free the Avahi configuration data */
2127
2496
avahi_server_config_free(&config);
2130
2499
/* Check if creating the Avahi server object succeeded */
2131
2500
if(mc.server == NULL){
2132
2501
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2133
avahi_strerror(error));
2502
avahi_strerror(ret_errno));
2134
2503
exitcode = EX_UNAVAILABLE;
2135
2504
goto end;
2136
2505
}
2142
2511
/* Create the Avahi service browser */
2143
2512
sb = avahi_s_service_browser_new(mc.server, if_index,
2144
2513
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2145
NULL, 0, browse_callback, NULL);
2514
NULL, 0, browse_callback,
2515
(void *)&mc);
2146
2516
if(sb == NULL){
2147
2517
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2148
2518
avahi_strerror(avahi_server_errno(mc.server)));
2159
2529
if(debug){
2160
2530
fprintf_plus(stderr, "Starting Avahi loop search\n");
2161
2531
}
2162
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2532
2533
ret = avahi_loop_with_timeout(simple_poll,
2534
(int)(retry_interval * 1000), &mc);
2165
2535
if(debug){
2166
2536
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2167
2537
(ret == 0) ? "successfully" : "with error");
2174
2544
}
2175
2545
2176
2546
/* Cleanup things */
2547
free(mc.interfaces);
2548
2177
2549
if(sb != NULL)
2178
2550
avahi_s_service_browser_free(sb);
2179
2551
2180
2552
if(mc.server != NULL)
2181
2553
avahi_server_free(mc.server);
2182
2554
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2555
if(simple_poll != NULL)
2556
avahi_simple_poll_free(simple_poll);
2185
2557
2186
2558
if(gnutls_initialized){
2187
2559
gnutls_certificate_free_credentials(mc.cred);
2192
2564
if(gpgme_initialized){
2193
2565
gpgme_release(mc.ctx);
2194
2566
}
2195
2567
2196
2568
/* Cleans up the circular linked list of Mandos servers the client
2197
2569
has seen */
2198
2570
if(mc.current_server != NULL){
2204
2576
}
2205
2577
}
2206
2578
2207
/* Re-raise priviliges */
2579
/* Re-raise privileges */
2208
2580
{
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2581
ret_errno = raise_privileges();
2582
if(ret_errno != 0){
2583
perror_plus("Failed to raise privileges");
2584
} else {
2585
2586
/* Run network hooks */
2587
run_network_hooks("stop", interfaces_hooks != NULL ?
2588
interfaces_hooks : "", delay);
2589
2590
/* Take down the network interfaces which were brought up */
2591
{
2592
char *interface = NULL;
2593
while((interface=argz_next(interfaces_to_take_down,
2594
interfaces_to_take_down_size,
2595
interface))){
2596
ret_errno = take_down_interface(interface);
2597
if(ret_errno != 0){
2598
errno = ret_errno;
2599
perror_plus("Failed to take down interface");
2600
}
2601
}
2602
if(debug and (interfaces_to_take_down == NULL)){
2603
fprintf_plus(stderr, "No interfaces needed to be taken"
2604
" down\n");
2605
}
2606
}
2217
2607
}
2218
2608
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2229
}
2230
}
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2234
}
2609
ret_errno = lower_privileges_permanently();
2610
if(ret_errno != 0){
2611
perror_plus("Failed to lower privileges permanently");
2235
2612
}
2236
2613
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2614
2615
free(interfaces_to_take_down);
2616
free(interfaces_hooks);
2243
2617
2244
2618
/* Removes the GPGME temp directory and all files inside */
2245
if(tempdir_created){
2619
if(tempdir != NULL){
2246
2620
struct dirent **direntries = NULL;
2247
struct dirent *direntry = NULL;
2248
int numentries = scandir(tempdir, &direntries, notdotentries,
2249
alphasort);
2250
if (numentries > 0){
2251
for(int i = 0; i < numentries; i++){
2252
direntry = direntries[i];
2253
char *fullname = NULL;
2254
ret = asprintf(&fullname, "%s/%s", tempdir,
2255
direntry->d_name);
2256
if(ret < 0){
2257
perror_plus("asprintf");
2258
continue;
2259
}
2260
ret = remove(fullname);
2261
if(ret == -1){
2262
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2263
strerror(errno));
2264
}
2265
free(fullname);
2621
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));
2622
if(tempdir_fd == -1){
2623
perror_plus("open");
2624
} else {
2625
int numentries = scandir(tempdir, &direntries, notdotentries,
2626
alphasort);
2627
if(numentries > 0){
2628
for(int i = 0; i < numentries; i++){
2629
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2630
if(ret == -1){
2631
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2632
" \"%s\", 0): %s\n", tempdir,
2633
direntries[i]->d_name, strerror(errno));
2634
}
2635
}
2636
2637
/* need to clean even if 0 because man page doesn't specify */
2638
free(direntries);
2639
if(numentries == -1){
2640
perror_plus("scandir");
2641
}
2642
ret = rmdir(tempdir);
2643
if(ret == -1 and errno != ENOENT){
2644
perror_plus("rmdir");
2645
}
2266
2646
}
2267
}
2268
2269
/* need to clean even if 0 because man page doesn't specify */
2270
free(direntries);
2271
if (numentries == -1){
2272
perror_plus("scandir");
2273
}
2274
ret = rmdir(tempdir);
2275
if(ret == -1 and errno != ENOENT){
2276
perror_plus("rmdir");
2647
TEMP_FAILURE_RETRY(close(tempdir_fd));
2277
2648
}
2278
2649
}
2279
2650
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0