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- Committer: Teddy Hogeborn
- Date: 2011-11-27 02:32:20 UTC
- mto: (505.2.10 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111127023220-bih6el7s0q6jhtci
* debian/mandos-client.README.Debian: Document network hook facility.
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
interface selection
algorithm.
(OPTIONS/--interface): Refer to NETWORK HOOKS section.
(OVERVIEW): Refer to password-prompt(8mandos) explicitly.
(NETWORK HOOKS): New section.
(FILES): Add "/lib/mandos/network-hooks.d".
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
interface selection
algorithm.
(OPTIONS/--interface): Refer to NETWORK HOOKS section.
(OVERVIEW): Refer to password-prompt(8mandos) explicitly.
(NETWORK HOOKS): New section.
(FILES): Add "/lib/mandos/network-hooks.d".
- files removed:
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_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
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
88
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
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() */
98
90
99
91
#ifdef __linux__
100
92
#include <sys/klog.h> /* klogctl() */
142
134
static const char sys_class_net[] = "/sys/class/net";
143
135
char *connect_to = NULL;
144
136
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
137
149
138
/* Doubly linked list that need to be circularly linked when used */
150
139
typedef struct server{
151
140
const char *ip;
152
in_port_t port;
141
uint16_t port;
153
142
AvahiIfIndex if_index;
154
143
int af;
155
144
struct timespec last_seen;
159
148
160
149
/* Used for passing in values through the Avahi callback functions */
161
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
162
152
AvahiServer *server;
163
153
gnutls_certificate_credentials_t cred;
164
154
unsigned int dh_bits;
166
156
const char *priority;
167
157
gpgme_ctx_t ctx;
168
158
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
159
} mandos_context;
172
160
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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 };
175
166
176
167
sig_atomic_t quit_now = 0;
177
168
int signal_received = 0;
178
169
179
170
/* Function to use when printing errors */
180
171
void perror_plus(const char *print_text){
181
int e = errno;
182
172
fprintf(stderr, "Mandos plugin %s: ",
183
173
program_invocation_short_name);
184
errno = e;
185
174
perror(print_text);
186
175
}
187
176
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
177
int fprintf_plus(FILE *stream, const char *format, ...){
190
178
va_list ap;
191
179
va_start (ap, format);
192
180
193
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
182
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
184
}
197
185
198
186
/*
200
188
* bytes. "buffer_capacity" is how much is currently allocated,
201
189
* "buffer_length" is how much is already used.
202
190
*/
203
__attribute__((nonnull, warn_unused_result))
204
191
size_t incbuffer(char **buffer, size_t buffer_length,
205
192
size_t buffer_capacity){
206
193
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
213
196
return 0;
214
197
}
215
*buffer = new_buf;
216
198
buffer_capacity += BUFFER_SIZE;
217
199
}
218
200
return buffer_capacity;
219
201
}
220
202
221
203
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
225
206
int ret;
226
207
server *new_server = malloc(sizeof(server));
227
208
if(new_server == NULL){
228
209
perror_plus("malloc");
229
return false;
210
return -1;
230
211
}
231
212
*new_server = (server){ .ip = strdup(ip),
232
213
.port = port,
234
215
.af = af };
235
216
if(new_server->ip == NULL){
236
217
perror_plus("strdup");
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;
218
return -1;
243
219
}
244
220
/* Special case of first server */
245
if(*current_server == NULL){
221
if (mc.current_server == NULL){
246
222
new_server->next = new_server;
247
223
new_server->prev = new_server;
248
*current_server = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
249
226
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
253
229
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
return true;
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;
257
238
}
258
239
259
240
/*
260
241
* Initialize GPGME.
261
242
*/
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){
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
267
245
gpgme_error_t rc;
268
246
gpgme_engine_info_t engine_info;
269
247
248
270
249
/*
271
250
* Helper function to insert pub and seckey to the engine keyring.
272
251
*/
273
bool import_key(const char * const filename){
252
bool import_key(const char *filename){
274
253
int ret;
275
254
int fd;
276
255
gpgme_data_t pgp_data;
288
267
return false;
289
268
}
290
269
291
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
292
271
if(rc != GPG_ERR_NO_ERROR){
293
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
273
gpgme_strsource(rc), gpgme_strerror(rc));
338
317
}
339
318
340
319
/* Create new GPGME "context" */
341
rc = gpgme_new(&(mc->ctx));
320
rc = gpgme_new(&(mc.ctx));
342
321
if(rc != GPG_ERR_NO_ERROR){
343
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
357
336
* Decrypt OpenPGP data.
358
337
* Returns -1 on error
359
338
*/
360
__attribute__((nonnull, warn_unused_result))
361
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
340
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
341
char **plaintext){
365
342
gpgme_data_t dh_crypto, dh_plain;
366
343
gpgme_error_t rc;
367
344
ssize_t ret;
393
370
394
371
/* Decrypt data from the cryptotext data buffer to the plaintext
395
372
data buffer */
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
397
374
if(rc != GPG_ERR_NO_ERROR){
398
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
376
gpgme_strsource(rc), gpgme_strerror(rc));
400
377
plaintext_length = -1;
401
378
if(debug){
402
379
gpgme_decrypt_result_t result;
403
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
404
381
if(result == NULL){
405
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
406
383
} else {
483
460
return plaintext_length;
484
461
}
485
462
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
489
466
if(ret == NULL)
490
467
ret = "(unknown)";
491
468
return ret;
492
469
}
493
470
494
471
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
472
static void debuggnutls(__attribute__((unused)) int level,
497
473
const char* string){
498
474
fprintf_plus(stderr, "GnuTLS: %s", string);
499
475
}
500
476
501
__attribute__((nonnull, warn_unused_result))
502
477
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
478
const char *seckeyfilename){
505
479
int ret;
506
480
507
481
if(debug){
524
498
}
525
499
526
500
/* OpenPGP credentials */
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
528
502
if(ret != GNUTLS_E_SUCCESS){
529
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
504
safer_gnutls_strerror(ret));
540
514
}
541
515
542
516
ret = gnutls_certificate_set_openpgp_key_file
543
(mc->cred, pubkeyfilename, seckeyfilename,
517
(mc.cred, pubkeyfilename, seckeyfilename,
544
518
GNUTLS_OPENPGP_FMT_BASE64);
545
519
if(ret != GNUTLS_E_SUCCESS){
546
520
fprintf_plus(stderr,
552
526
}
553
527
554
528
/* GnuTLS server initialization */
555
ret = gnutls_dh_params_init(&mc->dh_params);
529
ret = gnutls_dh_params_init(&mc.dh_params);
556
530
if(ret != GNUTLS_E_SUCCESS){
557
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
532
" initialization: %s\n",
559
533
safer_gnutls_strerror(ret));
560
534
goto globalfail;
561
535
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
563
537
if(ret != GNUTLS_E_SUCCESS){
564
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
539
safer_gnutls_strerror(ret));
566
540
goto globalfail;
567
541
}
568
542
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
544
571
545
return 0;
572
546
573
547
globalfail:
574
548
575
gnutls_certificate_free_credentials(mc->cred);
549
gnutls_certificate_free_credentials(mc.cred);
576
550
gnutls_global_deinit();
577
gnutls_dh_params_deinit(mc->dh_params);
551
gnutls_dh_params_deinit(mc.dh_params);
578
552
return -1;
579
553
}
580
554
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
555
static int init_gnutls_session(gnutls_session_t *session){
584
556
int ret;
585
557
/* GnuTLS session creation */
586
558
do {
598
570
{
599
571
const char *err;
600
572
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
602
574
if(quit_now){
603
575
gnutls_deinit(*session);
604
576
return -1;
615
587
616
588
do {
617
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
590
mc.cred);
619
591
if(quit_now){
620
592
gnutls_deinit(*session);
621
593
return -1;
631
603
/* ignore client certificate if any. */
632
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
605
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
635
607
636
608
return 0;
637
609
}
641
613
__attribute__((unused)) const char *txt){}
642
614
643
615
/* Called when a Mandos server is found */
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
646
617
AvahiIfIndex if_index,
647
int af, mandos_context *mc){
618
int af){
648
619
int ret, tcp_sd = -1;
649
620
ssize_t sret;
650
struct sockaddr_storage to;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
651
625
char *buffer = NULL;
652
626
char *decrypted_buffer = NULL;
653
627
size_t buffer_length = 0;
677
651
return -1;
678
652
}
679
653
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);
654
ret = init_gnutls_session(&session);
713
655
if(ret != 0){
714
656
return -1;
715
657
}
716
658
717
659
if(debug){
718
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
720
662
}
721
663
722
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
734
676
735
677
memset(&to, 0, sizeof(to));
736
678
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
739
681
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
742
684
}
743
685
if(ret < 0 ){
744
686
int e = errno;
753
695
goto mandos_end;
754
696
}
755
697
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
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*/
759
705
if(if_index == AVAHI_IF_UNSPEC){
760
706
fprintf_plus(stderr, "An IPv6 link-local address is"
761
707
" incomplete without a network interface\n");
763
709
goto mandos_end;
764
710
}
765
711
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
712
to.in6.sin6_scope_id = (uint32_t)if_index;
767
713
}
768
714
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
770
718
}
771
719
772
720
if(quit_now){
780
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
729
perror_plus("if_indextoname");
782
730
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
785
733
}
786
734
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
789
737
}
790
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
792
741
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
797
744
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
802
747
}
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);
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
}
809
754
}
810
755
}
811
756
815
760
}
816
761
817
762
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
820
764
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
766
}
824
767
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
769
int e = errno;
827
770
perror_plus("connect");
828
771
errno = e;
874
817
goto mandos_end;
875
818
}
876
819
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);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
882
822
883
823
if(quit_now){
884
824
errno = EINTR;
989
929
if(buffer_length > 0){
990
930
ssize_t decrypted_buffer_size;
991
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
932
&decrypted_buffer);
993
933
if(decrypted_buffer_size >= 0){
994
934
995
935
written = 0;
1043
983
return retval;
1044
984
}
1045
985
1046
__attribute__((nonnull))
1047
986
static void resolve_callback(AvahiSServiceResolver *r,
1048
987
AvahiIfIndex interface,
1049
988
AvahiProtocol proto,
1057
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
998
flags,
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1064
1001
1065
1002
/* Called whenever a service has been resolved successfully or
1066
1003
timed out */
1075
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
1014
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1080
1016
break;
1081
1017
1082
1018
case AVAHI_RESOLVER_FOUND:
1088
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
1025
host_name, ip, (intmax_t)interface, port);
1090
1026
}
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1095
1029
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1097
1031
} else {
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
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1104
1034
}
1105
1035
}
1106
1036
}
1116
1046
const char *domain,
1117
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
1048
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1123
1051
1124
1052
/* Called whenever a new services becomes available on the LAN or
1125
1053
is removed from the LAN */
1133
1061
case AVAHI_BROWSER_FAILURE:
1134
1062
1135
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1139
1066
return;
1140
1067
1141
1068
case AVAHI_BROWSER_NEW:
1144
1071
the callback function is called the Avahi server will free the
1145
1072
resolver for us. */
1146
1073
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)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1151
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
1078
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1155
1080
break;
1156
1081
1157
1082
case AVAHI_BROWSER_REMOVE:
1176
1101
signal_received = sig;
1177
1102
int old_errno = errno;
1178
1103
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1181
1106
}
1182
1107
errno = old_errno;
1183
1108
}
1184
1109
1185
__attribute__((nonnull, warn_unused_result))
1186
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1111
int ret;
1188
error_t ret_errno;
1189
1112
1190
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
1114
if(s < 0){
1192
ret_errno = errno;
1193
1115
perror_plus("socket");
1194
errno = ret_errno;
1195
1116
return false;
1196
1117
}
1197
1118
strcpy(ifr->ifr_name, ifname);
1198
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
1120
if(ret == -1){
1200
1121
if(debug){
1201
ret_errno = errno;
1202
1122
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1204
1123
}
1205
1124
return false;
1206
1125
}
1207
1126
return true;
1208
1127
}
1209
1128
1210
__attribute__((nonnull, warn_unused_result))
1211
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1130
1213
1131
/* Reject the loopback device */
1255
1173
* corresponds to an acceptable network device.
1256
1174
* (This function is passed to scandir(3) as a filter function.)
1257
1175
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
1176
int good_interface(const struct dirent *if_entry){
1260
1177
if(if_entry->d_name[0] == '.'){
1261
1178
return 0;
1277
1194
}
1278
1195
1279
1196
/*
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))
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
1314
1239
int notdotentries(const struct dirent *direntry){
1315
1240
/* Skip "." and ".." */
1316
1241
if(direntry->d_name[0] == '.'
1323
1248
}
1324
1249
1325
1250
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
1251
int runnable_hook(const struct dirent *direntry){
1328
1252
int ret;
1329
1253
size_t sret;
1337
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
1262
"abcdefghijklmnopqrstuvwxyz"
1339
1263
"0123456789"
1340
"_.-");
1264
"_-");
1341
1265
if((direntry->d_name)[sret] != '\0'){
1342
1266
/* Contains non-allowed characters */
1343
1267
if(debug){
1347
1271
return 0;
1348
1272
}
1349
1273
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
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);
1351
1282
if(ret == -1){
1352
1283
if(debug){
1353
1284
perror_plus("Could not stat hook");
1377
1308
return 1;
1378
1309
}
1379
1310
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1383
1312
int ret;
1384
1313
struct timespec now;
1385
1314
struct timespec waited_time;
1386
1315
intmax_t block_time;
1387
1316
1388
1317
while(true){
1389
if(mc->current_server == NULL){
1390
if(debug){
1318
if(mc.current_server == NULL){
1319
if (debug){
1391
1320
fprintf_plus(stderr, "Wait until first server is found."
1392
1321
" No timeout!\n");
1393
1322
}
1394
1323
ret = avahi_simple_poll_iterate(s, -1);
1395
1324
} else {
1396
if(debug){
1325
if (debug){
1397
1326
fprintf_plus(stderr, "Check current_server if we should run"
1398
1327
" it, or wait\n");
1399
1328
}
1406
1335
/* Calculating in ms how long time between now and server
1407
1336
who we visted longest time ago. Now - last seen. */
1408
1337
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1338
- mc.current_server->last_seen.tv_sec);
1410
1339
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1340
- mc.current_server->last_seen.tv_nsec);
1412
1341
/* total time is 10s/10,000ms.
1413
1342
Converting to s from ms by dividing by 1,000,
1414
1343
and ns to ms by dividing by 1,000,000. */
1416
1345
- ((intmax_t)waited_time.tv_sec * 1000))
1417
1346
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1347
1419
if(debug){
1348
if (debug){
1420
1349
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
1350
block_time);
1422
1351
}
1423
1352
1424
1353
if(block_time <= 0){
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
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
1429
1358
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1359
avahi_simple_poll_quit(mc.simple_poll);
1431
1360
return 0;
1432
1361
}
1433
1362
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1363
&mc.current_server->last_seen);
1435
1364
if(ret == -1){
1436
1365
perror_plus("clock_gettime");
1437
1366
return -1;
1438
1367
}
1439
mc->current_server = mc->current_server->next;
1368
mc.current_server = mc.current_server->next;
1440
1369
block_time = 0; /* Call avahi to find new Mandos
1441
1370
servers, but don't block */
1442
1371
}
1444
1373
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
1374
}
1446
1375
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1376
if (ret > 0 or errno != EINTR){
1448
1377
return (ret != 1) ? ret : 0;
1449
1378
}
1450
1379
}
1451
1380
}
1452
1381
}
1453
1382
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,
1383
bool run_network_hooks(const char *mode, const char *interface,
1531
1384
const float delay){
1532
1385
struct dirent **direntries;
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
struct dirent *direntry;
1387
int ret;
1388
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1389
alphasort);
1576
1390
if(numhooks == -1){
1577
1391
perror_plus("scandir");
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){
1392
} else {
1393
int devnull = open("/dev/null", O_RDONLY);
1394
for(int i = 0; i < numhooks; i++){
1395
direntry = direntries[i];
1396
char *fullname = NULL;
1397
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1398
if(ret < 0){
1649
1399
perror_plus("asprintf");
1650
_exit(EX_OSERR);
1651
}
1652
ret = setenv("DELAY", delaystring, 1);
1653
if(ret == -1){
1400
continue;
1401
}
1402
if(debug){
1403
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1404
direntry->d_name);
1405
}
1406
pid_t hook_pid = fork();
1407
if(hook_pid == 0){
1408
/* Child */
1409
dup2(devnull, STDIN_FILENO);
1410
close(devnull);
1411
dup2(STDERR_FILENO, STDOUT_FILENO);
1412
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1413
if(ret == -1){
1414
perror_plus("setenv");
1415
return false;
1416
}
1417
ret = setenv("DEVICE", interface, 1);
1418
if(ret == -1){
1419
perror_plus("setenv");
1420
return false;
1421
}
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1423
if(ret == -1){
1424
perror_plus("setenv");
1425
return false;
1426
}
1427
ret = setenv("MODE", mode, 1);
1428
if(ret == -1){
1429
perror_plus("setenv");
1430
return false;
1431
}
1432
char *delaystring;
1433
ret = asprintf(&delaystring, "%f", delay);
1434
if(ret == -1){
1435
perror_plus("asprintf");
1436
return false;
1437
}
1438
ret = setenv("DELAY", delaystring, 1);
1439
if(ret == -1){
1440
free(delaystring);
1441
perror_plus("setenv");
1442
return false;
1443
}
1654
1444
free(delaystring);
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;
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
1447
} else {
1448
int status;
1449
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1450
perror_plus("waitpid");
1451
free(fullname);
1452
continue;
1453
}
1454
if(WIFEXITED(status)){
1455
if(WEXITSTATUS(status) != 0){
1456
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1457
" with status %d\n", direntry->d_name,
1458
WEXITSTATUS(status));
1459
free(fullname);
1460
continue;
1461
}
1462
} else if(WIFSIGNALED(status)){
1463
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1464
" signal %d\n", direntry->d_name,
1465
WTERMSIG(status));
1466
free(fullname);
1467
continue;
1468
} else {
1469
fprintf_plus(stderr, "Warning: network hook \"%s\""
1470
" crashed\n", direntry->d_name);
1471
free(fullname);
1472
continue;
1473
}
1474
}
1475
free(fullname);
1476
if(debug){
1477
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1478
direntry->d_name);
1479
}
1480
}
1481
close(devnull);
1482
}
1483
return true;
1906
1484
}
1907
1485
1908
1486
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 };
1913
1487
AvahiSServiceBrowser *sb = NULL;
1914
error_t ret_errno;
1488
int error;
1915
1489
int ret;
1916
1490
intmax_t tmpmax;
1917
1491
char *tmp;
1918
1492
int exitcode = EXIT_SUCCESS;
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;
1493
const char *interface = "";
1494
struct ifreq network;
1495
int sd = -1;
1496
bool take_down_interface = false;
1497
uid_t uid;
1498
gid_t gid;
1499
char tempdir[] = "/tmp/mandosXXXXXX";
1500
bool tempdir_created = false;
1924
1501
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1925
1502
const char *seckey = PATHDIR "/" SECKEY;
1926
1503
const char *pubkey = PATHDIR "/" PUBKEY;
1927
char *interfaces_hooks = NULL;
1928
1504
1929
1505
bool gnutls_initialized = false;
1930
1506
bool gpgme_initialized = false;
1992
1568
.group = 2 },
1993
1569
{ .name = "retry", .key = 132,
1994
1570
.arg = "SECONDS",
1995
.doc = "Retry interval used when denied by the Mandos server",
1571
.doc = "Retry interval used when denied by the mandos server",
1996
1572
.group = 2 },
1997
1573
{ .name = "network-hook-dir", .key = 133,
1998
1574
.arg = "DIR",
2021
1597
connect_to = arg;
2022
1598
break;
2023
1599
case 'i': /* --interface */
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
}
1600
interface = arg;
2029
1601
break;
2030
1602
case 's': /* --seckey */
2031
1603
seckey = arg;
2074
1646
argp_state_help(state, state->out_stream,
2075
1647
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2076
1648
case 'V': /* --version */
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
2077
1651
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2078
1652
exit(argp_err_exit_status);
2079
1653
break;
2104
1678
}
2105
1679
}
2106
1680
2107
{
1681
if(getuid() == 0){
2108
1682
/* Work around Debian bug #633582:
2109
1683
<http://bugs.debian.org/633582> */
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
}
1684
struct stat st;
1685
1686
/* Re-raise priviliges */
1687
errno = 0;
1688
ret = seteuid(0);
1689
if(ret == -1){
1690
perror_plus("seteuid");
1691
}
1692
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1697
} else {
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1699
if(ret == -1){
1700
perror_plus("fstat");
1701
} else {
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1705
if(ret == -1){
1706
perror_plus("fchown");
1707
}
1708
}
1709
}
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1711
}
1712
}
1713
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1718
} else {
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1720
if(ret == -1){
1721
perror_plus("fstat");
1722
} else {
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1726
if(ret == -1){
1727
perror_plus("fchown");
1728
}
1729
}
1730
}
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1732
}
1733
}
1734
1735
/* Lower privileges */
1736
errno = 0;
1737
ret = seteuid(uid);
1738
if(ret == -1){
1739
perror_plus("seteuid");
2184
1740
}
2185
1741
}
2186
1742
2187
1743
/* Run network hooks */
2188
1744
{
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);
1745
if(getuid() == 0){
1746
/* Re-raise priviliges */
1747
errno = 0;
1748
ret = seteuid(0);
1749
if(ret == -1){
1750
perror_plus("seteuid");
1751
}
1752
}
1753
if(not run_network_hooks("start", interface, delay)){
1754
goto end;
1755
}
1756
if(getuid() == 0){
1757
/* Lower privileges */
1758
errno = 0;
1759
ret = seteuid(uid);
1760
if(ret == -1){
1761
perror_plus("seteuid");
1762
}
1763
}
2200
1764
}
2201
1765
2202
1766
if(not debug){
2203
1767
avahi_set_log_function(empty_log);
2204
1768
}
2205
1769
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1786
}
1787
if(interface == NULL){
1788
perror_plus("malloc");
1789
free(direntries);
1790
exitcode = EXIT_FAILURE;
1791
goto end;
1792
}
1793
free(direntries);
1794
} else {
1795
free(direntries);
1796
fprintf_plus(stderr, "Could not find a network interface\n");
1797
exitcode = EXIT_FAILURE;
1798
goto end;
1799
}
1800
}
1801
2206
1802
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2207
1803
from the signal handler */
2208
1804
/* Initialize the pseudo-RNG for Avahi */
2209
1805
srand((unsigned int) time(NULL));
2210
simple_poll = avahi_simple_poll_new();
2211
if(simple_poll == NULL){
1806
mc.simple_poll = avahi_simple_poll_new();
1807
if(mc.simple_poll == NULL){
2212
1808
fprintf_plus(stderr,
2213
1809
"Avahi: Failed to create simple poll object.\n");
2214
1810
exitcode = EX_UNAVAILABLE;
2278
1874
}
2279
1875
}
2280
1876
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;
1877
/* If the interface is down, bring it up */
1878
if(strcmp(interface, "none") != 0){
1879
if_index = (AvahiIfIndex) if_nametoindex(interface);
1880
if(if_index == 0){
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1883
goto end;
1884
}
1885
1886
if(quit_now){
1887
goto end;
1888
}
1889
1890
/* Re-raise priviliges */
1891
errno = 0;
1892
ret = seteuid(0);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
1897
#ifdef __linux__
1898
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1899
messages about the network interface to mess up the prompt */
1900
ret = klogctl(8, NULL, 5);
1901
bool restore_loglevel = true;
1902
if(ret == -1){
1903
restore_loglevel = false;
1904
perror_plus("klogctl");
1905
}
1906
#endif /* __linux__ */
1907
1908
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1909
if(sd < 0){
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1912
#ifdef __linux__
1913
if(restore_loglevel){
1914
ret = klogctl(7, NULL, 0);
1915
if(ret == -1){
1916
perror_plus("klogctl");
1917
}
1918
}
1919
#endif /* __linux__ */
1920
/* Lower privileges */
1921
errno = 0;
1922
ret = seteuid(uid);
1923
if(ret == -1){
1924
perror_plus("seteuid");
1925
}
1926
goto end;
1927
}
1928
strcpy(network.ifr_name, interface);
1929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1930
if(ret == -1){
1931
perror_plus("ioctl SIOCGIFFLAGS");
1932
#ifdef __linux__
1933
if(restore_loglevel){
1934
ret = klogctl(7, NULL, 0);
1935
if(ret == -1){
1936
perror_plus("klogctl");
1937
}
1938
}
1939
#endif /* __linux__ */
1940
exitcode = EX_OSERR;
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
if((network.ifr_flags & IFF_UP) == 0){
1950
network.ifr_flags |= IFF_UP;
1951
take_down_interface = true;
1952
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1953
if(ret == -1){
1954
take_down_interface = false;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1957
#ifdef __linux__
1958
if(restore_loglevel){
1959
ret = klogctl(7, NULL, 0);
1960
if(ret == -1){
1961
perror_plus("klogctl");
2328
1962
}
2329
1963
}
1964
#endif /* __linux__ */
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
}
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1976
for(int i=0; i < delay * 4; i++){
1977
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1978
if(ret == -1){
1979
perror_plus("ioctl SIOCGIFFLAGS");
1980
} else if(network.ifr_flags & IFF_RUNNING){
2330
1981
break;
2331
1982
}
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);
1983
struct timespec sleeptime = { .tv_nsec = 250000000 };
1984
ret = nanosleep(&sleeptime, NULL);
1985
if(ret == -1 and errno != EINTR){
1986
perror_plus("nanosleep");
1987
}
1988
}
1989
if(not take_down_interface){
1990
/* We won't need the socket anymore */
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1992
if(ret == -1){
1993
perror_plus("close");
1994
}
1995
}
1996
#ifdef __linux__
1997
if(restore_loglevel){
1998
/* Restores kernel loglevel to default */
1999
ret = klogctl(7, NULL, 0);
2000
if(ret == -1){
2001
perror_plus("klogctl");
2002
}
2003
}
2004
#endif /* __linux__ */
2005
/* Lower privileges */
2006
errno = 0;
2007
/* Lower privileges */
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2011
}
2359
2012
}
2360
2013
2361
2014
if(quit_now){
2362
2015
goto end;
2363
2016
}
2364
2017
2365
ret = init_gnutls_global(pubkey, seckey, &mc);
2018
ret = init_gnutls_global(pubkey, seckey);
2366
2019
if(ret == -1){
2367
2020
fprintf_plus(stderr, "init_gnutls_global failed\n");
2368
2021
exitcode = EX_UNAVAILABLE;
2375
2028
goto end;
2376
2029
}
2377
2030
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){
2031
if(mkdtemp(tempdir) == NULL){
2388
2032
perror_plus("mkdtemp");
2389
2033
goto end;
2390
2034
}
2035
tempdir_created = true;
2391
2036
2392
2037
if(quit_now){
2393
2038
goto end;
2394
2039
}
2395
2040
2396
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2041
if(not init_gpgme(pubkey, seckey, tempdir)){
2397
2042
fprintf_plus(stderr, "init_gpgme failed\n");
2398
2043
exitcode = EX_UNAVAILABLE;
2399
2044
goto end;
2409
2054
/* Connect directly, do not use Zeroconf */
2410
2055
/* (Mainly meant for debugging) */
2411
2056
char *address = strrchr(connect_to, ':');
2412
2413
2057
if(address == NULL){
2414
2058
fprintf_plus(stderr, "No colon in address\n");
2415
2059
exitcode = EX_USAGE;
2420
2064
goto end;
2421
2065
}
2422
2066
2423
in_port_t port;
2067
uint16_t port;
2424
2068
errno = 0;
2425
2069
tmpmax = strtoimax(address+1, &tmp, 10);
2426
2070
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2427
or tmpmax != (in_port_t)tmpmax){
2071
or tmpmax != (uint16_t)tmpmax){
2428
2072
fprintf_plus(stderr, "Bad port number\n");
2429
2073
exitcode = EX_USAGE;
2430
2074
goto end;
2431
2075
}
2432
2076
2433
2077
if(quit_now){
2434
2078
goto end;
2435
2079
}
2436
2080
2437
port = (in_port_t)tmpmax;
2081
port = (uint16_t)tmpmax;
2438
2082
*address = '\0';
2439
2083
/* Colon in address indicates IPv6 */
2440
2084
int af;
2456
2100
}
2457
2101
2458
2102
while(not quit_now){
2459
ret = start_mandos_communication(address, port, if_index, af,
2460
&mc);
2103
ret = start_mandos_communication(address, port, if_index, af);
2461
2104
if(quit_now or ret == 0){
2462
2105
break;
2463
2106
}
2465
2108
fprintf_plus(stderr, "Retrying in %d seconds\n",
2466
2109
(int)retry_interval);
2467
2110
}
2468
sleep((unsigned int)retry_interval);
2111
sleep((int)retry_interval);
2469
2112
}
2470
2113
2471
if(not quit_now){
2114
if (not quit_now){
2472
2115
exitcode = EXIT_SUCCESS;
2473
2116
}
2474
2117
2489
2132
config.publish_domain = 0;
2490
2133
2491
2134
/* Allocate a new server */
2492
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2493
&config, NULL, NULL, &ret_errno);
2135
mc.server = avahi_server_new(avahi_simple_poll_get
2136
(mc.simple_poll), &config, NULL,
2137
NULL, &error);
2494
2138
2495
2139
/* Free the Avahi configuration data */
2496
2140
avahi_server_config_free(&config);
2499
2143
/* Check if creating the Avahi server object succeeded */
2500
2144
if(mc.server == NULL){
2501
2145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2502
avahi_strerror(ret_errno));
2146
avahi_strerror(error));
2503
2147
exitcode = EX_UNAVAILABLE;
2504
2148
goto end;
2505
2149
}
2511
2155
/* Create the Avahi service browser */
2512
2156
sb = avahi_s_service_browser_new(mc.server, if_index,
2513
2157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2514
NULL, 0, browse_callback,
2515
(void *)&mc);
2158
NULL, 0, browse_callback, NULL);
2516
2159
if(sb == NULL){
2517
2160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2518
2161
avahi_strerror(avahi_server_errno(mc.server)));
2529
2172
if(debug){
2530
2173
fprintf_plus(stderr, "Starting Avahi loop search\n");
2531
2174
}
2532
2533
ret = avahi_loop_with_timeout(simple_poll,
2534
(int)(retry_interval * 1000), &mc);
2175
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
2535
2178
if(debug){
2536
2179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2537
2180
(ret == 0) ? "successfully" : "with error");
2544
2187
}
2545
2188
2546
2189
/* Cleanup things */
2547
free(mc.interfaces);
2548
2549
2190
if(sb != NULL)
2550
2191
avahi_s_service_browser_free(sb);
2551
2192
2552
2193
if(mc.server != NULL)
2553
2194
avahi_server_free(mc.server);
2554
2195
2555
if(simple_poll != NULL)
2556
avahi_simple_poll_free(simple_poll);
2196
if(mc.simple_poll != NULL)
2197
avahi_simple_poll_free(mc.simple_poll);
2557
2198
2558
2199
if(gnutls_initialized){
2559
2200
gnutls_certificate_free_credentials(mc.cred);
2576
2217
}
2577
2218
}
2578
2219
2579
/* Re-raise privileges */
2220
/* Re-raise priviliges */
2580
2221
{
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
}
2607
}
2608
2609
ret_errno = lower_privileges_permanently();
2610
if(ret_errno != 0){
2611
perror_plus("Failed to lower privileges permanently");
2612
}
2613
}
2614
2615
free(interfaces_to_take_down);
2616
free(interfaces_hooks);
2222
if(getuid() == 0){
2223
errno = 0;
2224
ret = seteuid(0);
2225
if(ret == -1){
2226
perror_plus("seteuid");
2227
}
2228
}
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2236
if(ret == -1){
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2243
}
2244
}
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2246
if(ret == -1){
2247
perror_plus("close");
2248
}
2249
}
2250
}
2251
if(getuid() == 0){
2252
/* Lower privileges permanently */
2253
errno = 0;
2254
ret = setuid(uid);
2255
if(ret == -1){
2256
perror_plus("setuid");
2257
}
2258
}
2617
2259
2618
2260
/* Removes the GPGME temp directory and all files inside */
2619
if(tempdir != NULL){
2261
if(tempdir_created){
2620
2262
struct dirent **direntries = NULL;
2621
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));
2622
if(tempdir_fd == -1){
2623
perror_plus("open");
2624
} else {
2625
#ifdef __GLIBC__
2626
#if __GLIBC_PREREQ(2, 15)
2627
int numentries = scandirat(tempdir_fd, ".", &direntries,
2628
notdotentries, alphasort);
2629
#else /* not __GLIBC_PREREQ(2, 15) */
2630
int numentries = scandir(tempdir, &direntries, notdotentries,
2631
alphasort);
2632
#endif /* not __GLIBC_PREREQ(2, 15) */
2633
#else /* not __GLIBC__ */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2635
alphasort);
2636
#endif /* not __GLIBC__ */
2637
if(numentries > 0){
2638
for(int i = 0; i < numentries; i++){
2639
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2640
if(ret == -1){
2641
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2642
" \"%s\", 0): %s\n", tempdir,
2643
direntries[i]->d_name, strerror(errno));
2644
}
2645
}
2646
2647
/* need to clean even if 0 because man page doesn't specify */
2648
free(direntries);
2649
if(numentries == -1){
2650
perror_plus("scandir");
2651
}
2652
ret = rmdir(tempdir);
2653
if(ret == -1 and errno != ENOENT){
2654
perror_plus("rmdir");
2655
}
2263
struct dirent *direntry = NULL;
2264
int numentries = scandir(tempdir, &direntries, notdotentries,
2265
alphasort);
2266
if (numentries > 0){
2267
for(int i = 0; i < numentries; i++){
2268
direntry = direntries[i];
2269
char *fullname = NULL;
2270
ret = asprintf(&fullname, "%s/%s", tempdir,
2271
direntry->d_name);
2272
if(ret < 0){
2273
perror_plus("asprintf");
2274
continue;
2275
}
2276
ret = remove(fullname);
2277
if(ret == -1){
2278
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2279
strerror(errno));
2280
}
2281
free(fullname);
2656
2282
}
2657
TEMP_FAILURE_RETRY(close(tempdir_fd));
2283
}
2284
2285
/* need to clean even if 0 because man page doesn't specify */
2286
free(direntries);
2287
if (numentries == -1){
2288
perror_plus("scandir");
2289
}
2290
ret = rmdir(tempdir);
2291
if(ret == -1 and errno != ENOENT){
2292
perror_plus("rmdir");
2658
2293
}
2659
2294
}
2660
2295
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0