To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 237.7.221
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.221
- Committer: Teddy Hogeborn
- Date: 2014-03-23 19:55:18 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 311.
- Revision ID: teddy@recompile.se-20140323195518-amvoytwi12iheypo
Make mandos-client prefer /run/tmp over /tmp.
* plugins.d/mandos-client.c (init_gpgme): Add more const.
(main): Make "tempdir" a pointer to the temporary directory, if one
has been created, or NULL. This also eliminates the need
for the "tempdir_created" variable.
* plugins.d/mandos-client.c (init_gpgme): Add more const.
(main): Make "tempdir" a pointer to the temporary directory, if one
has been created, or NULL. This also eliminates the need
for the "tempdir_created" variable.
- files added:
- debian/mandos-client.examples
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
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() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
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() */
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
91
97
92
98
#ifdef __linux__
93
99
#include <sys/klog.h> /* klogctl() */
130
136
131
137
bool debug = false;
132
138
static const char mandos_protocol_version[] = "1";
133
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
139
const char * argp_program_version = "mandos-client " VERSION;
140
const char * argp_program_bug_address = "<mandos@recompile.se>";
135
141
static const char sys_class_net[] = "/sys/class/net";
136
142
char *connect_to = NULL;
137
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
138
146
139
147
/* Doubly linked list that need to be circularly linked when used */
140
148
typedef struct server{
141
149
const char *ip;
142
uint16_t port;
150
in_port_t port;
143
151
AvahiIfIndex if_index;
144
152
int af;
145
153
struct timespec last_seen;
149
157
150
158
/* Used for passing in values through the Avahi callback functions */
151
159
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
160
AvahiServer *server;
154
161
gnutls_certificate_credentials_t cred;
155
162
unsigned int dh_bits;
157
164
const char *priority;
158
165
gpgme_ctx_t ctx;
159
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
160
169
} mandos_context;
161
170
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 };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
167
173
168
174
sig_atomic_t quit_now = 0;
169
175
int signal_received = 0;
177
183
perror(print_text);
178
184
}
179
185
180
__attribute__((format (gnu_printf, 2, 3)))
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
187
int fprintf_plus(FILE *stream, const char *format, ...){
182
188
va_list ap;
183
189
va_start (ap, format);
184
190
185
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
192
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
194
}
189
195
190
196
/*
192
198
* bytes. "buffer_capacity" is how much is currently allocated,
193
199
* "buffer_length" is how much is already used.
194
200
*/
201
__attribute__((nonnull, warn_unused_result))
195
202
size_t incbuffer(char **buffer, size_t buffer_length,
196
203
size_t buffer_capacity){
197
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
200
211
return 0;
201
212
}
213
*buffer = new_buf;
202
214
buffer_capacity += BUFFER_SIZE;
203
215
}
204
216
return buffer_capacity;
205
217
}
206
218
207
219
/* 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){
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
210
223
int ret;
211
224
server *new_server = malloc(sizeof(server));
212
225
if(new_server == NULL){
221
234
perror_plus("strdup");
222
235
return false;
223
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
224
242
/* Special case of first server */
225
if (mc.current_server == NULL){
243
if(*current_server == NULL){
226
244
new_server->next = new_server;
227
245
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
246
*current_server = new_server;
230
247
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
233
251
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;
252
(*current_server)->prev = new_server;
240
253
}
241
254
return true;
242
255
}
244
257
/*
245
258
* Initialize GPGME.
246
259
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
249
265
gpgme_error_t rc;
250
266
gpgme_engine_info_t engine_info;
251
267
252
253
268
/*
254
269
* Helper function to insert pub and seckey to the engine keyring.
255
270
*/
256
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
257
272
int ret;
258
273
int fd;
259
274
gpgme_data_t pgp_data;
271
286
return false;
272
287
}
273
288
274
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
275
290
if(rc != GPG_ERR_NO_ERROR){
276
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
292
gpgme_strsource(rc), gpgme_strerror(rc));
321
336
}
322
337
323
338
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
325
340
if(rc != GPG_ERR_NO_ERROR){
326
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
340
355
* Decrypt OpenPGP data.
341
356
* Returns -1 on error
342
357
*/
358
__attribute__((nonnull, warn_unused_result))
343
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
360
size_t crypto_size,
345
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
346
363
gpgme_data_t dh_crypto, dh_plain;
347
364
gpgme_error_t rc;
348
365
ssize_t ret;
374
391
375
392
/* Decrypt data from the cryptotext data buffer to the plaintext
376
393
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
395
if(rc != GPG_ERR_NO_ERROR){
379
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
397
gpgme_strsource(rc), gpgme_strerror(rc));
381
398
plaintext_length = -1;
382
399
if(debug){
383
400
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
385
402
if(result == NULL){
386
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
404
} else {
464
481
return plaintext_length;
465
482
}
466
483
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
470
487
if(ret == NULL)
471
488
ret = "(unknown)";
472
489
return ret;
473
490
}
474
491
475
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
476
494
static void debuggnutls(__attribute__((unused)) int level,
477
495
const char* string){
478
496
fprintf_plus(stderr, "GnuTLS: %s", string);
479
497
}
480
498
499
__attribute__((nonnull, warn_unused_result))
481
500
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
483
503
int ret;
484
504
485
505
if(debug){
502
522
}
503
523
504
524
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
526
if(ret != GNUTLS_E_SUCCESS){
507
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
528
safer_gnutls_strerror(ret));
518
538
}
519
539
520
540
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
522
542
GNUTLS_OPENPGP_FMT_BASE64);
523
543
if(ret != GNUTLS_E_SUCCESS){
524
544
fprintf_plus(stderr,
530
550
}
531
551
532
552
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
534
554
if(ret != GNUTLS_E_SUCCESS){
535
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
556
" initialization: %s\n",
537
557
safer_gnutls_strerror(ret));
538
558
goto globalfail;
539
559
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
541
561
if(ret != GNUTLS_E_SUCCESS){
542
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
563
safer_gnutls_strerror(ret));
544
564
goto globalfail;
545
565
}
546
566
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
568
549
569
return 0;
550
570
551
571
globalfail:
552
572
553
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
554
574
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
556
576
return -1;
557
577
}
558
578
559
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
560
582
int ret;
561
583
/* GnuTLS session creation */
562
584
do {
574
596
{
575
597
const char *err;
576
598
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
600
if(quit_now){
579
601
gnutls_deinit(*session);
580
602
return -1;
591
613
592
614
do {
593
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
616
mc->cred);
595
617
if(quit_now){
596
618
gnutls_deinit(*session);
597
619
return -1;
607
629
/* ignore client certificate if any. */
608
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
631
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
611
633
612
634
return 0;
613
635
}
617
639
__attribute__((unused)) const char *txt){}
618
640
619
641
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
621
644
AvahiIfIndex if_index,
622
int af){
645
int af, mandos_context *mc){
623
646
int ret, tcp_sd = -1;
624
647
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
648
struct sockaddr_storage to;
629
649
char *buffer = NULL;
630
650
char *decrypted_buffer = NULL;
631
651
size_t buffer_length = 0;
655
675
return -1;
656
676
}
657
677
658
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
659
711
if(ret != 0){
660
712
return -1;
661
713
}
662
714
663
715
if(debug){
664
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
717
PRIuMAX "\n", ip, (uintmax_t)port);
666
718
}
667
719
668
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
680
732
681
733
memset(&to, 0, sizeof(to));
682
734
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
685
737
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
688
740
}
689
741
if(ret < 0 ){
690
742
int e = errno;
699
751
goto mandos_end;
700
752
}
701
753
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*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
757
if(if_index == AVAHI_IF_UNSPEC){
710
758
fprintf_plus(stderr, "An IPv6 link-local address is"
711
759
" incomplete without a network interface\n");
713
761
goto mandos_end;
714
762
}
715
763
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
765
}
718
766
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
768
}
723
769
724
770
if(quit_now){
732
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
779
perror_plus("if_indextoname");
734
780
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
737
783
}
738
784
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
741
787
}
742
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
790
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
748
795
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
751
800
}
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
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
807
}
759
808
}
760
809
764
813
}
765
814
766
815
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
768
818
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
770
821
}
771
822
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
824
int e = errno;
774
825
perror_plus("connect");
775
826
errno = e;
821
872
goto mandos_end;
822
873
}
823
874
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
826
880
827
881
if(quit_now){
828
882
errno = EINTR;
933
987
if(buffer_length > 0){
934
988
ssize_t decrypted_buffer_size;
935
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
990
&decrypted_buffer, mc);
937
991
if(decrypted_buffer_size >= 0){
938
992
939
993
written = 0;
987
1041
return retval;
988
1042
}
989
1043
1044
__attribute__((nonnull))
990
1045
static void resolve_callback(AvahiSServiceResolver *r,
991
1046
AvahiIfIndex interface,
992
1047
AvahiProtocol proto,
1000
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
1057
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
1005
1062
1006
1063
/* Called whenever a service has been resolved successfully or
1007
1064
timed out */
1016
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
1075
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1020
1078
break;
1021
1079
1022
1080
case AVAHI_RESOLVER_FOUND:
1028
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
1087
host_name, ip, (intmax_t)interface, port);
1030
1088
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1033
1093
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1035
1095
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1038
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
1100
" list\n", name);
1040
1101
}
1053
1114
const char *domain,
1054
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1116
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1058
1121
1059
1122
/* Called whenever a new services becomes available on the LAN or
1060
1123
is removed from the LAN */
1068
1131
case AVAHI_BROWSER_FAILURE:
1069
1132
1070
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1073
1137
return;
1074
1138
1075
1139
case AVAHI_BROWSER_NEW:
1078
1142
the callback function is called the Avahi server will free the
1079
1143
resolver for us. */
1080
1144
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1084
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
1150
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1087
1153
break;
1088
1154
1089
1155
case AVAHI_BROWSER_REMOVE:
1108
1174
signal_received = sig;
1109
1175
int old_errno = errno;
1110
1176
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1113
1179
}
1114
1180
errno = old_errno;
1115
1181
}
1116
1182
1183
__attribute__((nonnull, warn_unused_result))
1117
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
1185
int ret;
1186
error_t ret_errno;
1119
1187
1120
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
1189
if(s < 0){
1190
ret_errno = errno;
1122
1191
perror_plus("socket");
1192
errno = ret_errno;
1123
1193
return false;
1124
1194
}
1125
1195
strcpy(ifr->ifr_name, ifname);
1126
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
1197
if(ret == -1){
1128
1198
if(debug){
1199
ret_errno = errno;
1129
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1130
1202
}
1131
1203
return false;
1132
1204
}
1133
1205
return true;
1134
1206
}
1135
1207
1208
__attribute__((nonnull, warn_unused_result))
1136
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1210
1138
1211
/* Reject the loopback device */
1180
1253
* corresponds to an acceptable network device.
1181
1254
* (This function is passed to scandir(3) as a filter function.)
1182
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1183
1257
int good_interface(const struct dirent *if_entry){
1184
1258
if(if_entry->d_name[0] == '.'){
1185
1259
return 0;
1201
1275
}
1202
1276
1203
1277
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1246
1312
int notdotentries(const struct dirent *direntry){
1247
1313
/* Skip "." and ".." */
1248
1314
if(direntry->d_name[0] == '.'
1255
1321
}
1256
1322
1257
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1258
1325
int runnable_hook(const struct dirent *direntry){
1259
1326
int ret;
1260
1327
size_t sret;
1315
1382
return 1;
1316
1383
}
1317
1384
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1319
1388
int ret;
1320
1389
struct timespec now;
1321
1390
struct timespec waited_time;
1322
1391
intmax_t block_time;
1323
1392
1324
1393
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1394
if(mc->current_server == NULL){
1395
if(debug){
1327
1396
fprintf_plus(stderr, "Wait until first server is found."
1328
1397
" No timeout!\n");
1329
1398
}
1330
1399
ret = avahi_simple_poll_iterate(s, -1);
1331
1400
} else {
1332
if (debug){
1401
if(debug){
1333
1402
fprintf_plus(stderr, "Check current_server if we should run"
1334
1403
" it, or wait\n");
1335
1404
}
1342
1411
/* Calculating in ms how long time between now and server
1343
1412
who we visted longest time ago. Now - last seen. */
1344
1413
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1414
- mc->current_server->last_seen.tv_sec);
1346
1415
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1416
- mc->current_server->last_seen.tv_nsec);
1348
1417
/* total time is 10s/10,000ms.
1349
1418
Converting to s from ms by dividing by 1,000,
1350
1419
and ns to ms by dividing by 1,000,000. */
1352
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1353
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1423
1355
if (debug){
1424
if(debug){
1356
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
1426
block_time);
1358
1427
}
1359
1428
1360
1429
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1365
1434
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1435
avahi_simple_poll_quit(s);
1367
1436
return 0;
1368
1437
}
1369
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1439
&mc->current_server->last_seen);
1371
1440
if(ret == -1){
1372
1441
perror_plus("clock_gettime");
1373
1442
return -1;
1374
1443
}
1375
mc.current_server = mc.current_server->next;
1444
mc->current_server = mc->current_server->next;
1376
1445
block_time = 0; /* Call avahi to find new Mandos
1377
1446
servers, but don't block */
1378
1447
}
1380
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
1450
}
1382
1451
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1452
if(ret > 0 or errno != EINTR){
1384
1453
return (ret != 1) ? ret : 0;
1385
1454
}
1386
1455
}
1387
1456
}
1388
1457
}
1389
1458
1390
bool run_network_hooks(const char *mode, const char *interface,
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1391
1517
const float delay){
1392
1518
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
1520
alphasort);
1397
1521
if(numhooks == -1){
1398
perror_plus("scandir");
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1399
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1400
1533
int devnull = open("/dev/null", O_RDONLY);
1401
1534
for(int i = 0; i < numhooks; i++){
1402
1535
direntry = direntries[i];
1414
1547
if(hook_pid == 0){
1415
1548
/* Child */
1416
1549
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1427
1553
}
1428
1554
/* Set group */
1429
1555
errno = 0;
1430
1556
ret = setgid(0);
1431
1557
if(ret == -1){
1432
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1433
1560
}
1434
1561
/* Reset supplementary groups */
1435
1562
errno = 0;
1436
1563
ret = setgroups(0, NULL);
1437
1564
if(ret == -1){
1438
1565
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1443
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
1584
if(ret == -1){
1445
1585
perror_plus("setenv");
1461
1601
_exit(EX_OSERR);
1462
1602
}
1463
1603
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1465
1605
if(ret == -1){
1466
1606
perror_plus("asprintf");
1467
1607
_exit(EX_OSERR);
1520
1660
}
1521
1661
close(devnull);
1522
1662
}
1523
return true;
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
bool restore_loglevel = false;
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
#ifdef __linux__
1723
int ret_linux;
1724
if(ret_errno == 0){
1725
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1726
messages about the network interface to mess up the prompt */
1727
ret_linux = klogctl(8, NULL, 5);
1728
if(ret_linux == -1){
1729
perror_plus("klogctl");
1730
} else {
1731
restore_loglevel = true;
1732
}
1733
}
1734
#endif /* __linux__ */
1735
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1736
ioctl_errno = errno;
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
ret_linux = klogctl(7, NULL, 0);
1740
if(ret_linux == -1){
1741
perror_plus("klogctl");
1742
}
1743
}
1744
#endif /* __linux__ */
1745
1746
/* If raise_privileges() succeeded above */
1747
if(ret_errno == 0){
1748
/* Lower privileges */
1749
ret_errno = lower_privileges();
1750
if(ret_errno != 0){
1751
errno = ret_errno;
1752
perror_plus("Failed to lower privileges");
1753
}
1754
}
1755
1756
/* Close the socket */
1757
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1758
if(ret == -1){
1759
perror_plus("close");
1760
}
1761
1762
if(ret_setflags == -1){
1763
errno = ioctl_errno;
1764
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1765
errno = old_errno;
1766
return ioctl_errno;
1767
}
1768
} else if(debug){
1769
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1770
interface);
1771
}
1772
1773
/* Sleep checking until interface is running.
1774
Check every 0.25s, up to total time of delay */
1775
for(int i=0; i < delay * 4; i++){
1776
if(interface_is_running(interface)){
1777
break;
1778
}
1779
struct timespec sleeptime = { .tv_nsec = 250000000 };
1780
ret = nanosleep(&sleeptime, NULL);
1781
if(ret == -1 and errno != EINTR){
1782
perror_plus("nanosleep");
1783
}
1784
}
1785
1786
errno = old_errno;
1787
return 0;
1788
}
1789
1790
__attribute__((nonnull, warn_unused_result))
1791
error_t take_down_interface(const char *const interface){
1792
error_t old_errno = errno;
1793
struct ifreq network;
1794
unsigned int if_index = if_nametoindex(interface);
1795
if(if_index == 0){
1796
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1797
errno = old_errno;
1798
return ENXIO;
1799
}
1800
if(interface_is_up(interface)){
1801
error_t ret_errno = 0, ioctl_errno = 0;
1802
if(not get_flags(interface, &network) and debug){
1803
ret_errno = errno;
1804
fprintf_plus(stderr, "Failed to get flags for interface "
1805
"\"%s\"\n", interface);
1806
errno = old_errno;
1807
return ret_errno;
1808
}
1809
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1810
1811
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1812
if(sd == -1){
1813
ret_errno = errno;
1814
perror_plus("socket");
1815
errno = old_errno;
1816
return ret_errno;
1817
}
1818
1819
if(debug){
1820
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1821
interface);
1822
}
1823
1824
/* Raise privileges */
1825
ret_errno = raise_privileges();
1826
if(ret_errno != 0){
1827
perror_plus("Failed to raise privileges");
1828
}
1829
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1830
ioctl_errno = errno;
1831
1832
/* If raise_privileges() succeeded above */
1833
if(ret_errno == 0){
1834
/* Lower privileges */
1835
ret_errno = lower_privileges();
1836
if(ret_errno != 0){
1837
errno = ret_errno;
1838
perror_plus("Failed to lower privileges");
1839
}
1840
}
1841
1842
/* Close the socket */
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1844
if(ret == -1){
1845
perror_plus("close");
1846
}
1847
1848
if(ret_setflags == -1){
1849
errno = ioctl_errno;
1850
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1851
errno = old_errno;
1852
return ioctl_errno;
1853
}
1854
} else if(debug){
1855
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1856
interface);
1857
}
1858
1859
errno = old_errno;
1860
return 0;
1524
1861
}
1525
1862
1526
1863
int main(int argc, char *argv[]){
1864
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1867
.interfaces = NULL, .interfaces_size = 0 };
1527
1868
AvahiSServiceBrowser *sb = NULL;
1528
int error;
1869
error_t ret_errno;
1529
1870
int ret;
1530
1871
intmax_t tmpmax;
1531
1872
char *tmp;
1532
1873
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
1874
char *interfaces_to_take_down = NULL;
1875
size_t interfaces_to_take_down_size = 0;
1876
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1877
char old_tempdir[] = "/tmp/mandosXXXXXX";
1878
char *tempdir = NULL;
1541
1879
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
1880
const char *seckey = PATHDIR "/" SECKEY;
1543
1881
const char *pubkey = PATHDIR "/" PUBKEY;
1882
char *interfaces_hooks = NULL;
1544
1883
1545
1884
bool gnutls_initialized = false;
1546
1885
bool gpgme_initialized = false;
1637
1976
connect_to = arg;
1638
1977
break;
1639
1978
case 'i': /* --interface */
1640
interface = arg;
1979
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1980
arg, (int)',');
1981
if(ret_errno != 0){
1982
argp_error(state, "%s", strerror(ret_errno));
1983
}
1641
1984
break;
1642
1985
case 's': /* --seckey */
1643
1986
seckey = arg;
1720
2063
/* Work around Debian bug #633582:
1721
2064
<http://bugs.debian.org/633582> */
1722
2065
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
2066
/* Re-raise privileges */
2067
ret_errno = raise_privileges();
2068
if(ret_errno != 0){
2069
errno = ret_errno;
2070
perror_plus("Failed to raise privileges");
1728
2071
} else {
1729
2072
struct stat st;
1730
2073
1771
2114
}
1772
2115
1773
2116
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2117
ret_errno = lower_privileges();
2118
if(ret_errno != 0){
2119
errno = ret_errno;
2120
perror_plus("Failed to lower privileges");
2121
}
2122
}
2123
}
2124
2125
/* Remove invalid interface names (except "none") */
2126
{
2127
char *interface = NULL;
2128
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2129
interface))){
2130
if(strcmp(interface, "none") != 0
2131
and if_nametoindex(interface) == 0){
2132
if(interface[0] != '\0'){
2133
fprintf_plus(stderr, "Not using nonexisting interface"
2134
" \"%s\"\n", interface);
2135
}
2136
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2137
interface = NULL;
1778
2138
}
1779
2139
}
1780
2140
}
1781
2141
1782
2142
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2143
{
2144
if(mc.interfaces != NULL){
2145
interfaces_hooks = malloc(mc.interfaces_size);
2146
if(interfaces_hooks == NULL){
2147
perror_plus("malloc");
2148
goto end;
2149
}
2150
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2151
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2152
}
2153
run_network_hooks("start", interfaces_hooks != NULL ?
2154
interfaces_hooks : "", delay);
1785
2155
}
1786
2156
1787
2157
if(not debug){
1788
2158
avahi_set_log_function(empty_log);
1789
2159
}
1790
2160
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
1823
2161
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2162
from the signal handler */
1825
2163
/* Initialize the pseudo-RNG for Avahi */
1826
2164
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2165
simple_poll = avahi_simple_poll_new();
2166
if(simple_poll == NULL){
1829
2167
fprintf_plus(stderr,
1830
2168
"Avahi: Failed to create simple poll object.\n");
1831
2169
exitcode = EX_UNAVAILABLE;
1895
2233
}
1896
2234
}
1897
2235
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
2236
/* If no interfaces were specified, make a list */
2237
if(mc.interfaces == NULL){
2238
struct dirent **direntries;
2239
/* Look for any good interfaces */
2240
ret = scandir(sys_class_net, &direntries, good_interface,
2241
alphasort);
2242
if(ret >= 1){
2243
/* Add all found interfaces to interfaces list */
2244
for(int i = 0; i < ret; ++i){
2245
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2246
direntries[i]->d_name);
2247
if(ret_errno != 0){
2248
errno = ret_errno;
2249
perror_plus("argz_add");
2250
continue;
2251
}
2252
if(debug){
2253
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2254
direntries[i]->d_name);
2255
}
2256
}
2257
free(direntries);
2258
} else {
2259
free(direntries);
2260
fprintf_plus(stderr, "Could not find a network interface\n");
2261
exitcode = EXIT_FAILURE;
2262
goto end;
2263
}
2264
}
2265
2266
/* Bring up interfaces which are down, and remove any "none"s */
2267
{
2268
char *interface = NULL;
2269
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2270
interface))){
2271
/* If interface name is "none", stop bringing up interfaces.
2272
Also remove all instances of "none" from the list */
2273
if(strcmp(interface, "none") == 0){
2274
argz_delete(&mc.interfaces, &mc.interfaces_size,
2275
interface);
2276
interface = NULL;
2277
while((interface = argz_next(mc.interfaces,
2278
mc.interfaces_size, interface))){
2279
if(strcmp(interface, "none") == 0){
2280
argz_delete(&mc.interfaces, &mc.interfaces_size,
2281
interface);
2282
interface = NULL;
1983
2283
}
1984
2284
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2002
2285
break;
2003
2286
}
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2287
bool interface_was_up = interface_is_up(interface);
2288
errno = bring_up_interface(interface, delay);
2289
if(not interface_was_up){
2290
if(errno != 0){
2291
perror_plus("Failed to bring up interface");
2292
} else {
2293
errno = argz_add(&interfaces_to_take_down,
2294
&interfaces_to_take_down_size,
2295
interface);
2296
if(errno != 0){
2297
perror_plus("argz_add");
2298
}
2299
}
2300
}
2301
}
2302
if(debug and (interfaces_to_take_down == NULL)){
2303
fprintf_plus(stderr, "No interfaces were brought up\n");
2304
}
2305
}
2306
2307
/* If we only got one interface, explicitly use only that one */
2308
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2309
if(debug){
2310
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2311
mc.interfaces);
2312
}
2313
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2033
2314
}
2034
2315
2035
2316
if(quit_now){
2036
2317
goto end;
2037
2318
}
2038
2319
2039
ret = init_gnutls_global(pubkey, seckey);
2320
ret = init_gnutls_global(pubkey, seckey, &mc);
2040
2321
if(ret == -1){
2041
2322
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2323
exitcode = EX_UNAVAILABLE;
2049
2330
goto end;
2050
2331
}
2051
2332
2052
if(mkdtemp(tempdir) == NULL){
2333
/* Try /run/tmp before /tmp */
2334
tempdir = mkdtemp(run_tempdir);
2335
if(tempdir == NULL and errno == ENOENT){
2336
if(debug){
2337
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2338
run_tempdir, old_tempdir);
2339
}
2340
tempdir = mkdtemp(old_tempdir);
2341
}
2342
if(tempdir == NULL){
2053
2343
perror_plus("mkdtemp");
2054
2344
goto end;
2055
2345
}
2056
tempdir_created = true;
2057
2346
2058
2347
if(quit_now){
2059
2348
goto end;
2060
2349
}
2061
2350
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2351
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2063
2352
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2353
exitcode = EX_UNAVAILABLE;
2065
2354
goto end;
2075
2364
/* Connect directly, do not use Zeroconf */
2076
2365
/* (Mainly meant for debugging) */
2077
2366
char *address = strrchr(connect_to, ':');
2367
2078
2368
if(address == NULL){
2079
2369
fprintf_plus(stderr, "No colon in address\n");
2080
2370
exitcode = EX_USAGE;
2085
2375
goto end;
2086
2376
}
2087
2377
2088
uint16_t port;
2378
in_port_t port;
2089
2379
errno = 0;
2090
2380
tmpmax = strtoimax(address+1, &tmp, 10);
2091
2381
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2382
or tmpmax != (in_port_t)tmpmax){
2093
2383
fprintf_plus(stderr, "Bad port number\n");
2094
2384
exitcode = EX_USAGE;
2095
2385
goto end;
2096
2386
}
2097
2387
2098
2388
if(quit_now){
2099
2389
goto end;
2100
2390
}
2101
2391
2102
port = (uint16_t)tmpmax;
2392
port = (in_port_t)tmpmax;
2103
2393
*address = '\0';
2104
2394
/* Colon in address indicates IPv6 */
2105
2395
int af;
2121
2411
}
2122
2412
2123
2413
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2414
ret = start_mandos_communication(address, port, if_index, af,
2415
&mc);
2125
2416
if(quit_now or ret == 0){
2126
2417
break;
2127
2418
}
2129
2420
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
2421
(int)retry_interval);
2131
2422
}
2132
sleep((int)retry_interval);
2423
sleep((unsigned int)retry_interval);
2133
2424
}
2134
2425
2135
if (not quit_now){
2426
if(not quit_now){
2136
2427
exitcode = EXIT_SUCCESS;
2137
2428
}
2138
2429
2153
2444
config.publish_domain = 0;
2154
2445
2155
2446
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2447
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2448
&config, NULL, NULL, &ret_errno);
2159
2449
2160
2450
/* Free the Avahi configuration data */
2161
2451
avahi_server_config_free(&config);
2164
2454
/* Check if creating the Avahi server object succeeded */
2165
2455
if(mc.server == NULL){
2166
2456
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2457
avahi_strerror(ret_errno));
2168
2458
exitcode = EX_UNAVAILABLE;
2169
2459
goto end;
2170
2460
}
2176
2466
/* Create the Avahi service browser */
2177
2467
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
2468
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
2469
NULL, 0, browse_callback,
2470
(void *)&mc);
2180
2471
if(sb == NULL){
2181
2472
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
2473
avahi_strerror(avahi_server_errno(mc.server)));
2194
2485
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
2486
}
2196
2487
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2488
ret = avahi_loop_with_timeout(simple_poll,
2489
(int)(retry_interval * 1000), &mc);
2199
2490
if(debug){
2200
2491
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
2492
(ret == 0) ? "successfully" : "with error");
2208
2499
}
2209
2500
2210
2501
/* Cleanup things */
2502
free(mc.interfaces);
2503
2211
2504
if(sb != NULL)
2212
2505
avahi_s_service_browser_free(sb);
2213
2506
2214
2507
if(mc.server != NULL)
2215
2508
avahi_server_free(mc.server);
2216
2509
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2510
if(simple_poll != NULL)
2511
avahi_simple_poll_free(simple_poll);
2219
2512
2220
2513
if(gnutls_initialized){
2221
2514
gnutls_certificate_free_credentials(mc.cred);
2238
2531
}
2239
2532
}
2240
2533
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2534
/* Re-raise privileges */
2245
2535
{
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
2250
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2262
}
2263
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2267
}
2268
}
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2536
ret_errno = raise_privileges();
2537
if(ret_errno != 0){
2538
perror_plus("Failed to raise privileges");
2539
} else {
2540
2541
/* Run network hooks */
2542
run_network_hooks("stop", interfaces_hooks != NULL ?
2543
interfaces_hooks : "", delay);
2544
2545
/* Take down the network interfaces which were brought up */
2546
{
2547
char *interface = NULL;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2550
interface))){
2551
ret_errno = take_down_interface(interface);
2552
if(ret_errno != 0){
2553
errno = ret_errno;
2554
perror_plus("Failed to take down interface");
2555
}
2556
}
2557
if(debug and (interfaces_to_take_down == NULL)){
2558
fprintf_plus(stderr, "No interfaces needed to be taken"
2559
" down\n");
2560
}
2561
}
2562
}
2563
ret_errno = lower_privileges_permanently();
2564
if(ret_errno != 0){
2565
perror_plus("Failed to lower privileges permanently");
2566
}
2567
}
2568
2569
free(interfaces_to_take_down);
2570
free(interfaces_hooks);
2276
2571
2277
2572
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
2573
if(tempdir != NULL){
2279
2574
struct dirent **direntries = NULL;
2280
2575
struct dirent *direntry = NULL;
2281
2576
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
2577
alphasort);
2283
if (numentries > 0){
2578
if(numentries > 0){
2284
2579
for(int i = 0; i < numentries; i++){
2285
2580
direntry = direntries[i];
2286
2581
char *fullname = NULL;
2301
2596
2302
2597
/* need to clean even if 0 because man page doesn't specify */
2303
2598
free(direntries);
2304
if (numentries == -1){
2599
if(numentries == -1){
2305
2600
perror_plus("scandir");
2306
2601
}
2307
2602
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0