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- Committer: Teddy Hogeborn
- Date: 2012-06-07 21:00:57 UTC
- mto: This revision was merged to the branch mainline in revision 596.
- Revision ID: teddy@recompile.se-20120607210057-9k4mou58uht7sj2m
* plugins.d/mandos-client.c (bring_up_interface): Bug fix: Return
errno code. Don't
modify errno.
errno code. Don't
modify errno.
- files removed:
- debian/upstream
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
90
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
91
99
92
#ifdef __linux__
100
93
#include <sys/klog.h> /* klogctl() */
142
135
static const char sys_class_net[] = "/sys/class/net";
143
136
char *connect_to = NULL;
144
137
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
138
uid_t uid = 65534;
147
139
gid_t gid = 65534;
148
140
149
141
/* Doubly linked list that need to be circularly linked when used */
150
142
typedef struct server{
151
143
const char *ip;
152
in_port_t port;
144
uint16_t port;
153
145
AvahiIfIndex if_index;
154
146
int af;
155
147
struct timespec last_seen;
159
151
160
152
/* Used for passing in values through the Avahi callback functions */
161
153
typedef struct {
154
AvahiSimplePoll *simple_poll;
162
155
AvahiServer *server;
163
156
gnutls_certificate_credentials_t cred;
164
157
unsigned int dh_bits;
166
159
const char *priority;
167
160
gpgme_ctx_t ctx;
168
161
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
162
} mandos_context;
172
163
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
164
/* global context so signal handler can reach it*/
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
175
169
176
170
sig_atomic_t quit_now = 0;
177
171
int signal_received = 0;
185
179
perror(print_text);
186
180
}
187
181
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
182
__attribute__((format (gnu_printf, 2, 3)))
189
183
int fprintf_plus(FILE *stream, const char *format, ...){
190
184
va_list ap;
191
185
va_start (ap, format);
192
186
193
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
188
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
190
}
197
191
198
192
/*
200
194
* bytes. "buffer_capacity" is how much is currently allocated,
201
195
* "buffer_length" is how much is already used.
202
196
*/
203
__attribute__((nonnull, warn_unused_result))
204
197
size_t incbuffer(char **buffer, size_t buffer_length,
205
198
size_t buffer_capacity){
206
199
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;
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
if(buffer == NULL){
213
202
return 0;
214
203
}
215
*buffer = new_buf;
216
204
buffer_capacity += BUFFER_SIZE;
217
205
}
218
206
return buffer_capacity;
219
207
}
220
208
221
209
/* 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){
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
225
212
int ret;
226
213
server *new_server = malloc(sizeof(server));
227
214
if(new_server == NULL){
234
221
.af = af };
235
222
if(new_server->ip == NULL){
236
223
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
224
return false;
253
225
}
254
226
/* Special case of first server */
255
if(*current_server == NULL){
227
if (mc.current_server == NULL){
256
228
new_server->next = new_server;
257
229
new_server->prev = new_server;
258
*current_server = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
259
232
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
263
235
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
265
242
}
266
243
return true;
267
244
}
269
246
/*
270
247
* Initialize GPGME.
271
248
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
277
251
gpgme_error_t rc;
278
252
gpgme_engine_info_t engine_info;
279
253
254
280
255
/*
281
256
* Helper function to insert pub and seckey to the engine keyring.
282
257
*/
283
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
284
259
int ret;
285
260
int fd;
286
261
gpgme_data_t pgp_data;
298
273
return false;
299
274
}
300
275
301
rc = gpgme_op_import(mc->ctx, pgp_data);
276
rc = gpgme_op_import(mc.ctx, pgp_data);
302
277
if(rc != GPG_ERR_NO_ERROR){
303
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
279
gpgme_strsource(rc), gpgme_strerror(rc));
348
323
}
349
324
350
325
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
326
rc = gpgme_new(&(mc.ctx));
352
327
if(rc != GPG_ERR_NO_ERROR){
353
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
342
* Decrypt OpenPGP data.
368
343
* Returns -1 on error
369
344
*/
370
__attribute__((nonnull, warn_unused_result))
371
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
346
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
347
char **plaintext){
375
348
gpgme_data_t dh_crypto, dh_plain;
376
349
gpgme_error_t rc;
377
350
ssize_t ret;
403
376
404
377
/* Decrypt data from the cryptotext data buffer to the plaintext
405
378
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
380
if(rc != GPG_ERR_NO_ERROR){
408
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
382
gpgme_strsource(rc), gpgme_strerror(rc));
410
383
plaintext_length = -1;
411
384
if(debug){
412
385
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
386
result = gpgme_op_decrypt_result(mc.ctx);
414
387
if(result == NULL){
415
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
389
} else {
493
466
return plaintext_length;
494
467
}
495
468
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
469
static const char * safer_gnutls_strerror(int value){
470
const char *ret = gnutls_strerror(value); /* Spurious warning from
471
-Wunreachable-code */
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
507
475
}
508
476
509
477
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
478
static void debuggnutls(__attribute__((unused)) int level,
512
479
const char* string){
513
480
fprintf_plus(stderr, "GnuTLS: %s", string);
514
481
}
515
482
516
__attribute__((nonnull, warn_unused_result))
517
483
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
mandos_context *mc){
484
const char *seckeyfilename){
520
485
int ret;
521
unsigned int uret;
522
486
523
487
if(debug){
524
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
540
504
}
541
505
542
506
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
508
if(ret != GNUTLS_E_SUCCESS){
545
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
510
safer_gnutls_strerror(ret));
556
520
}
557
521
558
522
ret = gnutls_certificate_set_openpgp_key_file
559
(mc->cred, pubkeyfilename, seckeyfilename,
523
(mc.cred, pubkeyfilename, seckeyfilename,
560
524
GNUTLS_OPENPGP_FMT_BASE64);
561
525
if(ret != GNUTLS_E_SUCCESS){
562
526
fprintf_plus(stderr,
568
532
}
569
533
570
534
/* GnuTLS server initialization */
571
ret = gnutls_dh_params_init(&mc->dh_params);
535
ret = gnutls_dh_params_init(&mc.dh_params);
572
536
if(ret != GNUTLS_E_SUCCESS){
573
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
538
" initialization: %s\n",
575
539
safer_gnutls_strerror(ret));
576
540
goto globalfail;
577
541
}
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
680
543
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
683
546
goto globalfail;
684
547
}
685
548
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
687
550
688
551
return 0;
689
552
690
553
globalfail:
691
554
692
gnutls_certificate_free_credentials(mc->cred);
555
gnutls_certificate_free_credentials(mc.cred);
693
556
gnutls_global_deinit();
694
gnutls_dh_params_deinit(mc->dh_params);
557
gnutls_dh_params_deinit(mc.dh_params);
695
558
return -1;
696
559
}
697
560
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
561
static int init_gnutls_session(gnutls_session_t *session){
701
562
int ret;
702
563
/* GnuTLS session creation */
703
564
do {
715
576
{
716
577
const char *err;
717
578
do {
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
719
580
if(quit_now){
720
581
gnutls_deinit(*session);
721
582
return -1;
732
593
733
594
do {
734
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
735
mc->cred);
596
mc.cred);
736
597
if(quit_now){
737
598
gnutls_deinit(*session);
738
599
return -1;
748
609
/* ignore client certificate if any. */
749
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
611
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
752
613
753
614
return 0;
754
615
}
758
619
__attribute__((unused)) const char *txt){}
759
620
760
621
/* Called when a Mandos server is found */
761
__attribute__((nonnull, warn_unused_result))
762
static int start_mandos_communication(const char *ip, in_port_t port,
622
static int start_mandos_communication(const char *ip, uint16_t port,
763
623
AvahiIfIndex if_index,
764
int af, mandos_context *mc){
624
int af){
765
625
int ret, tcp_sd = -1;
766
626
ssize_t sret;
767
struct sockaddr_storage to;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
768
631
char *buffer = NULL;
769
632
char *decrypted_buffer = NULL;
770
633
size_t buffer_length = 0;
794
657
return -1;
795
658
}
796
659
797
/* If the interface is specified and we have a list of interfaces */
798
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
799
/* Check if the interface is one of the interfaces we are using */
800
bool match = false;
801
{
802
char *interface = NULL;
803
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
804
interface))){
805
if(if_nametoindex(interface) == (unsigned int)if_index){
806
match = true;
807
break;
808
}
809
}
810
}
811
if(not match){
812
/* This interface does not match any in the list, so we don't
813
connect to the server */
814
if(debug){
815
char interface[IF_NAMESIZE];
816
if(if_indextoname((unsigned int)if_index, interface) == NULL){
817
perror_plus("if_indextoname");
818
} else {
819
fprintf_plus(stderr, "Skipping server on non-used interface"
820
" \"%s\"\n",
821
if_indextoname((unsigned int)if_index,
822
interface));
823
}
824
}
825
return -1;
826
}
827
}
828
829
ret = init_gnutls_session(&session, mc);
660
ret = init_gnutls_session(&session);
830
661
if(ret != 0){
831
662
return -1;
832
663
}
833
664
834
665
if(debug){
835
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
836
PRIuMAX "\n", ip, (uintmax_t)port);
667
PRIu16 "\n", ip, port);
837
668
}
838
669
839
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
851
682
852
683
memset(&to, 0, sizeof(to));
853
684
if(af == AF_INET6){
854
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
855
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
856
687
} else { /* IPv4 */
857
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
858
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
859
690
}
860
691
if(ret < 0 ){
861
692
int e = errno;
870
701
goto mandos_end;
871
702
}
872
703
if(af == AF_INET6){
873
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
874
if(IN6_IS_ADDR_LINKLOCAL
875
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
704
to.in6.sin6_port = htons(port); /* Spurious warnings from
705
-Wconversion and
706
-Wunreachable-code */
707
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
876
711
if(if_index == AVAHI_IF_UNSPEC){
877
712
fprintf_plus(stderr, "An IPv6 link-local address is"
878
713
" incomplete without a network interface\n");
880
715
goto mandos_end;
881
716
}
882
717
/* Set the network interface number as scope */
883
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
718
to.in6.sin6_scope_id = (uint32_t)if_index;
884
719
}
885
720
} else {
886
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
to.in.sin_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
887
724
}
888
725
889
726
if(quit_now){
897
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
735
perror_plus("if_indextoname");
899
736
} else {
900
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
901
"\n", ip, interface, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
902
739
}
903
740
} else {
904
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
905
ip, (uintmax_t)port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
906
743
}
907
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
908
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
const char *pcret;
909
747
if(af == AF_INET6){
910
ret = getnameinfo((struct sockaddr *)&to,
911
sizeof(struct sockaddr_in6),
912
addrstr, sizeof(addrstr), NULL, 0,
913
NI_NUMERICHOST);
748
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
sizeof(addrstr));
914
750
} else {
915
ret = getnameinfo((struct sockaddr *)&to,
916
sizeof(struct sockaddr_in),
917
addrstr, sizeof(addrstr), NULL, 0,
918
NI_NUMERICHOST);
751
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
752
sizeof(addrstr));
919
753
}
920
if(ret == EAI_SYSTEM){
921
perror_plus("getnameinfo");
922
} else if(ret != 0) {
923
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
924
} else if(strcmp(addrstr, ip) != 0){
925
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
if(pcret == NULL){
755
perror_plus("inet_ntop");
756
} else {
757
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
759
}
926
760
}
927
761
}
928
762
932
766
}
933
767
934
768
if(af == AF_INET6){
935
ret = connect(tcp_sd, (struct sockaddr *)&to,
936
sizeof(struct sockaddr_in6));
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
937
770
} else {
938
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
939
sizeof(struct sockaddr_in));
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
940
772
}
941
773
if(ret < 0){
942
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
943
775
int e = errno;
944
776
perror_plus("connect");
945
777
errno = e;
1106
938
if(buffer_length > 0){
1107
939
ssize_t decrypted_buffer_size;
1108
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1109
&decrypted_buffer, mc);
941
&decrypted_buffer);
1110
942
if(decrypted_buffer_size >= 0){
1111
943
1112
944
written = 0;
1160
992
return retval;
1161
993
}
1162
994
1163
__attribute__((nonnull))
1164
995
static void resolve_callback(AvahiSServiceResolver *r,
1165
996
AvahiIfIndex interface,
1166
997
AvahiProtocol proto,
1174
1005
AVAHI_GCC_UNUSED AvahiStringList *txt,
1175
1006
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1176
1007
flags,
1177
void *mc){
1178
if(r == NULL){
1179
return;
1180
}
1008
AVAHI_GCC_UNUSED void* userdata){
1009
assert(r);
1181
1010
1182
1011
/* Called whenever a service has been resolved successfully or
1183
1012
timed out */
1184
1013
1185
1014
if(quit_now){
1186
avahi_s_service_resolver_free(r);
1187
1015
return;
1188
1016
}
1189
1017
1193
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1194
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1195
1023
domain,
1196
avahi_strerror(avahi_server_errno
1197
(((mandos_context*)mc)->server)));
1024
avahi_strerror(avahi_server_errno(mc.server)));
1198
1025
break;
1199
1026
1200
1027
case AVAHI_RESOLVER_FOUND:
1206
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1207
1034
host_name, ip, (intmax_t)interface, port);
1208
1035
}
1209
int ret = start_mandos_communication(ip, (in_port_t)port,
1210
interface,
1211
avahi_proto_to_af(proto),
1212
mc);
1036
int ret = start_mandos_communication(ip, port, interface,
1037
avahi_proto_to_af(proto));
1213
1038
if(ret == 0){
1214
avahi_simple_poll_quit(simple_poll);
1039
avahi_simple_poll_quit(mc.simple_poll);
1215
1040
} else {
1216
if(not add_server(ip, (in_port_t)port, interface,
1217
avahi_proto_to_af(proto),
1218
&((mandos_context*)mc)->current_server)){
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1219
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1220
1044
" list\n", name);
1221
1045
}
1234
1058
const char *domain,
1235
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1236
1060
flags,
1237
void *mc){
1238
if(b == NULL){
1239
return;
1240
}
1061
AVAHI_GCC_UNUSED void* userdata){
1062
assert(b);
1241
1063
1242
1064
/* Called whenever a new services becomes available on the LAN or
1243
1065
is removed from the LAN */
1251
1073
case AVAHI_BROWSER_FAILURE:
1252
1074
1253
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1254
avahi_strerror(avahi_server_errno
1255
(((mandos_context*)mc)->server)));
1256
avahi_simple_poll_quit(simple_poll);
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
1257
1078
return;
1258
1079
1259
1080
case AVAHI_BROWSER_NEW:
1262
1083
the callback function is called the Avahi server will free the
1263
1084
resolver for us. */
1264
1085
1265
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1266
interface, protocol, name, type,
1267
domain, protocol, 0,
1268
resolve_callback, mc) == NULL)
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
resolve_callback, NULL) == NULL)
1269
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1270
1090
" %s\n", name,
1271
avahi_strerror(avahi_server_errno
1272
(((mandos_context*)mc)->server)));
1091
avahi_strerror(avahi_server_errno(mc.server)));
1273
1092
break;
1274
1093
1275
1094
case AVAHI_BROWSER_REMOVE:
1294
1113
signal_received = sig;
1295
1114
int old_errno = errno;
1296
1115
/* set main loop to exit */
1297
if(simple_poll != NULL){
1298
avahi_simple_poll_quit(simple_poll);
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1299
1118
}
1300
1119
errno = old_errno;
1301
1120
}
1302
1121
1303
__attribute__((nonnull, warn_unused_result))
1304
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1305
1123
int ret;
1306
error_t ret_errno;
1307
1124
1308
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1309
1126
if(s < 0){
1310
ret_errno = errno;
1311
1127
perror_plus("socket");
1312
errno = ret_errno;
1313
1128
return false;
1314
1129
}
1315
1130
strcpy(ifr->ifr_name, ifname);
1316
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1317
1132
if(ret == -1){
1318
1133
if(debug){
1319
ret_errno = errno;
1320
1134
perror_plus("ioctl SIOCGIFFLAGS");
1321
errno = ret_errno;
1322
1135
}
1323
1136
return false;
1324
1137
}
1325
1138
return true;
1326
1139
}
1327
1140
1328
__attribute__((nonnull, warn_unused_result))
1329
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1330
1142
1331
1143
/* Reject the loopback device */
1373
1185
* corresponds to an acceptable network device.
1374
1186
* (This function is passed to scandir(3) as a filter function.)
1375
1187
*/
1376
__attribute__((nonnull, warn_unused_result))
1377
1188
int good_interface(const struct dirent *if_entry){
1378
1189
if(if_entry->d_name[0] == '.'){
1379
1190
return 0;
1395
1206
}
1396
1207
1397
1208
/*
1398
* This function determines if a network interface is up.
1399
*/
1400
__attribute__((nonnull, warn_unused_result))
1401
bool interface_is_up(const char *interface){
1402
struct ifreq ifr;
1403
if(not get_flags(interface, &ifr)){
1404
if(debug){
1405
fprintf_plus(stderr, "Failed to get flags for interface "
1406
"\"%s\"\n", interface);
1407
}
1408
return false;
1409
}
1410
1411
return (bool)(ifr.ifr_flags & IFF_UP);
1412
}
1413
1414
/*
1415
* This function determines if a network interface is running
1416
*/
1417
__attribute__((nonnull, warn_unused_result))
1418
bool interface_is_running(const char *interface){
1419
struct ifreq ifr;
1420
if(not get_flags(interface, &ifr)){
1421
if(debug){
1422
fprintf_plus(stderr, "Failed to get flags for interface "
1423
"\"%s\"\n", interface);
1424
}
1425
return false;
1426
}
1427
1428
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1429
}
1430
1431
__attribute__((nonnull, pure, warn_unused_result))
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1432
1251
int notdotentries(const struct dirent *direntry){
1433
1252
/* Skip "." and ".." */
1434
1253
if(direntry->d_name[0] == '.'
1441
1260
}
1442
1261
1443
1262
/* Is this directory entry a runnable program? */
1444
__attribute__((nonnull, warn_unused_result))
1445
1263
int runnable_hook(const struct dirent *direntry){
1446
1264
int ret;
1447
1265
size_t sret;
1455
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1456
1274
"abcdefghijklmnopqrstuvwxyz"
1457
1275
"0123456789"
1458
"_.-");
1276
"_-");
1459
1277
if((direntry->d_name)[sret] != '\0'){
1460
1278
/* Contains non-allowed characters */
1461
1279
if(debug){
1465
1283
return 0;
1466
1284
}
1467
1285
1468
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1469
1294
if(ret == -1){
1470
1295
if(debug){
1471
1296
perror_plus("Could not stat hook");
1495
1320
return 1;
1496
1321
}
1497
1322
1498
__attribute__((nonnull, warn_unused_result))
1499
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1500
mandos_context *mc){
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1501
1324
int ret;
1502
1325
struct timespec now;
1503
1326
struct timespec waited_time;
1504
1327
intmax_t block_time;
1505
1328
1506
1329
while(true){
1507
if(mc->current_server == NULL){
1508
if(debug){
1330
if(mc.current_server == NULL){
1331
if (debug){
1509
1332
fprintf_plus(stderr, "Wait until first server is found."
1510
1333
" No timeout!\n");
1511
1334
}
1512
1335
ret = avahi_simple_poll_iterate(s, -1);
1513
1336
} else {
1514
if(debug){
1337
if (debug){
1515
1338
fprintf_plus(stderr, "Check current_server if we should run"
1516
1339
" it, or wait\n");
1517
1340
}
1524
1347
/* Calculating in ms how long time between now and server
1525
1348
who we visted longest time ago. Now - last seen. */
1526
1349
waited_time.tv_sec = (now.tv_sec
1527
- mc->current_server->last_seen.tv_sec);
1350
- mc.current_server->last_seen.tv_sec);
1528
1351
waited_time.tv_nsec = (now.tv_nsec
1529
- mc->current_server->last_seen.tv_nsec);
1352
- mc.current_server->last_seen.tv_nsec);
1530
1353
/* total time is 10s/10,000ms.
1531
1354
Converting to s from ms by dividing by 1,000,
1532
1355
and ns to ms by dividing by 1,000,000. */
1534
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1535
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1536
1359
1537
if(debug){
1360
if (debug){
1538
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1539
1362
block_time);
1540
1363
}
1541
1364
1542
1365
if(block_time <= 0){
1543
ret = start_mandos_communication(mc->current_server->ip,
1544
mc->current_server->port,
1545
mc->current_server->if_index,
1546
mc->current_server->af, mc);
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1547
1370
if(ret == 0){
1548
avahi_simple_poll_quit(s);
1371
avahi_simple_poll_quit(mc.simple_poll);
1549
1372
return 0;
1550
1373
}
1551
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1552
&mc->current_server->last_seen);
1375
&mc.current_server->last_seen);
1553
1376
if(ret == -1){
1554
1377
perror_plus("clock_gettime");
1555
1378
return -1;
1556
1379
}
1557
mc->current_server = mc->current_server->next;
1380
mc.current_server = mc.current_server->next;
1558
1381
block_time = 0; /* Call avahi to find new Mandos
1559
1382
servers, but don't block */
1560
1383
}
1562
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1563
1386
}
1564
1387
if(ret != 0){
1565
if(ret > 0 or errno != EINTR){
1388
if (ret > 0 or errno != EINTR){
1566
1389
return (ret != 1) ? ret : 0;
1567
1390
}
1568
1391
}
1570
1393
}
1571
1394
1572
1395
/* Set effective uid to 0, return errno */
1573
__attribute__((warn_unused_result))
1574
error_t raise_privileges(void){
1575
error_t old_errno = errno;
1576
error_t ret_errno = 0;
1396
int raise_privileges(void){
1397
int old_errno = errno;
1398
int ret_errno = 0;
1399
errno = 0;
1577
1400
if(seteuid(0) == -1){
1578
ret_errno = errno;
1401
perror_plus("seteuid");
1579
1402
}
1403
ret_errno = errno;
1580
1404
errno = old_errno;
1581
1405
return ret_errno;
1582
1406
}
1583
1407
1584
1408
/* Set effective and real user ID to 0. Return errno. */
1585
__attribute__((warn_unused_result))
1586
error_t raise_privileges_permanently(void){
1587
error_t old_errno = errno;
1588
error_t ret_errno = raise_privileges();
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1589
1412
if(ret_errno != 0){
1590
1413
errno = old_errno;
1591
1414
return ret_errno;
1592
1415
}
1416
errno = 0;
1593
1417
if(setuid(0) == -1){
1594
ret_errno = errno;
1418
perror_plus("seteuid");
1595
1419
}
1420
ret_errno = errno;
1596
1421
errno = old_errno;
1597
1422
return ret_errno;
1598
1423
}
1599
1424
1600
1425
/* Set effective user ID to unprivileged saved user ID */
1601
__attribute__((warn_unused_result))
1602
error_t lower_privileges(void){
1603
error_t old_errno = errno;
1604
error_t ret_errno = 0;
1426
int lower_privileges(void){
1427
int old_errno = errno;
1428
int ret_errno = 0;
1429
errno = 0;
1605
1430
if(seteuid(uid) == -1){
1606
ret_errno = errno;
1607
}
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
/* Lower privileges permanently */
1613
__attribute__((warn_unused_result))
1614
error_t lower_privileges_permanently(void){
1615
error_t old_errno = errno;
1616
error_t ret_errno = 0;
1617
if(setuid(uid) == -1){
1618
ret_errno = errno;
1619
}
1620
errno = old_errno;
1621
return ret_errno;
1622
}
1623
1624
__attribute__((nonnull))
1625
void run_network_hooks(const char *mode, const char *interface,
1431
perror_plus("seteuid");
1432
}
1433
ret_errno = errno;
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
bool run_network_hooks(const char *mode, const char *interface,
1626
1439
const float delay){
1627
struct dirent **direntries = NULL;
1628
if(hookdir_fd == -1){
1629
hookdir_fd = open(hookdir, O_RDONLY);
1630
if(hookdir_fd == -1){
1631
if(errno == ENOENT){
1632
if(debug){
1633
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1634
" found\n", hookdir);
1635
}
1636
} else {
1637
perror_plus("open");
1638
}
1639
return;
1640
}
1641
}
1642
#ifdef __GLIBC__
1643
#if __GLIBC_PREREQ(2, 15)
1644
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1645
runnable_hook, alphasort);
1646
#else /* not __GLIBC_PREREQ(2, 15) */
1647
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1648
alphasort);
1649
#endif /* not __GLIBC_PREREQ(2, 15) */
1650
#else /* not __GLIBC__ */
1651
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1652
alphasort);
1653
#endif /* not __GLIBC__ */
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1442
int ret;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1444
alphasort);
1654
1445
if(numhooks == -1){
1655
1446
perror_plus("scandir");
1656
return;
1657
}
1658
struct dirent *direntry;
1659
int ret;
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[i];
1663
if(debug){
1664
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1665
direntry->d_name);
1666
}
1667
pid_t hook_pid = fork();
1668
if(hook_pid == 0){
1669
/* Child */
1670
/* Raise privileges */
1671
errno = raise_privileges_permanently();
1672
if(errno != 0){
1673
perror_plus("Failed to raise privileges");
1674
_exit(EX_NOPERM);
1675
}
1676
/* Set group */
1677
errno = 0;
1678
ret = setgid(0);
1679
if(ret == -1){
1680
perror_plus("setgid");
1681
_exit(EX_NOPERM);
1682
}
1683
/* Reset supplementary groups */
1684
errno = 0;
1685
ret = setgroups(0, NULL);
1686
if(ret == -1){
1687
perror_plus("setgroups");
1688
_exit(EX_NOPERM);
1689
}
1690
ret = dup2(devnull, STDIN_FILENO);
1691
if(ret == -1){
1692
perror_plus("dup2(devnull, STDIN_FILENO)");
1693
_exit(EX_OSERR);
1694
}
1695
ret = close(devnull);
1696
if(ret == -1){
1697
perror_plus("close");
1698
_exit(EX_OSERR);
1699
}
1700
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1701
if(ret == -1){
1702
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1703
_exit(EX_OSERR);
1704
}
1705
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1706
if(ret == -1){
1707
perror_plus("setenv");
1708
_exit(EX_OSERR);
1709
}
1710
ret = setenv("DEVICE", interface, 1);
1711
if(ret == -1){
1712
perror_plus("setenv");
1713
_exit(EX_OSERR);
1714
}
1715
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1716
if(ret == -1){
1717
perror_plus("setenv");
1718
_exit(EX_OSERR);
1719
}
1720
ret = setenv("MODE", mode, 1);
1721
if(ret == -1){
1722
perror_plus("setenv");
1723
_exit(EX_OSERR);
1724
}
1725
char *delaystring;
1726
ret = asprintf(&delaystring, "%f", (double)delay);
1727
if(ret == -1){
1447
} else {
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1453
if(ret < 0){
1728
1454
perror_plus("asprintf");
1729
_exit(EX_OSERR);
1730
}
1731
ret = setenv("DELAY", delaystring, 1);
1732
if(ret == -1){
1455
continue;
1456
}
1457
if(debug){
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1459
direntry->d_name);
1460
}
1461
pid_t hook_pid = fork();
1462
if(hook_pid == 0){
1463
/* Child */
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1466
/* Set group */
1467
errno = 0;
1468
ret = setgid(0);
1469
if(ret == -1){
1470
perror_plus("setgid");
1471
}
1472
/* Reset supplementary groups */
1473
errno = 0;
1474
ret = setgroups(0, NULL);
1475
if(ret == -1){
1476
perror_plus("setgroups");
1477
}
1478
dup2(devnull, STDIN_FILENO);
1479
close(devnull);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1482
if(ret == -1){
1483
perror_plus("setenv");
1484
_exit(EX_OSERR);
1485
}
1486
ret = setenv("DEVICE", interface, 1);
1487
if(ret == -1){
1488
perror_plus("setenv");
1489
_exit(EX_OSERR);
1490
}
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1492
if(ret == -1){
1493
perror_plus("setenv");
1494
_exit(EX_OSERR);
1495
}
1496
ret = setenv("MODE", mode, 1);
1497
if(ret == -1){
1498
perror_plus("setenv");
1499
_exit(EX_OSERR);
1500
}
1501
char *delaystring;
1502
ret = asprintf(&delaystring, "%f", delay);
1503
if(ret == -1){
1504
perror_plus("asprintf");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DELAY", delaystring, 1);
1508
if(ret == -1){
1509
free(delaystring);
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1733
1513
free(delaystring);
1734
perror_plus("setenv");
1735
_exit(EX_OSERR);
1736
}
1737
free(delaystring);
1738
if(connect_to != NULL){
1739
ret = setenv("CONNECT", connect_to, 1);
1740
if(ret == -1){
1741
perror_plus("setenv");
1742
_exit(EX_OSERR);
1743
}
1744
}
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1746
if(hook_fd == -1){
1747
perror_plus("openat");
1748
_exit(EXIT_FAILURE);
1749
}
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1751
perror_plus("close");
1752
_exit(EXIT_FAILURE);
1753
}
1754
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1755
environ) == -1){
1756
perror_plus("fexecve");
1757
_exit(EXIT_FAILURE);
1758
}
1759
} else {
1760
if(hook_pid == -1){
1761
perror_plus("fork");
1762
free(direntry);
1763
continue;
1764
}
1765
int status;
1766
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1767
perror_plus("waitpid");
1768
free(direntry);
1769
continue;
1770
}
1771
if(WIFEXITED(status)){
1772
if(WEXITSTATUS(status) != 0){
1773
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1774
" with status %d\n", direntry->d_name,
1775
WEXITSTATUS(status));
1776
free(direntry);
1777
continue;
1778
}
1779
} else if(WIFSIGNALED(status)){
1780
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1781
" signal %d\n", direntry->d_name,
1782
WTERMSIG(status));
1783
free(direntry);
1784
continue;
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
}
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
1524
}
1785
1525
} else {
1786
fprintf_plus(stderr, "Warning: network hook \"%s\""
1787
" crashed\n", direntry->d_name);
1788
free(direntry);
1789
continue;
1790
}
1791
}
1792
if(debug){
1793
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1794
direntry->d_name);
1795
}
1796
free(direntry);
1797
}
1798
free(direntries);
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1800
perror_plus("close");
1801
} else {
1802
hookdir_fd = -1;
1803
}
1804
close(devnull);
1526
int status;
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1529
free(fullname);
1530
continue;
1531
}
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1537
free(fullname);
1538
continue;
1539
}
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1543
WTERMSIG(status));
1544
free(fullname);
1545
continue;
1546
} else {
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1549
free(fullname);
1550
continue;
1551
}
1552
}
1553
free(fullname);
1554
if(debug){
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1556
direntry->d_name);
1557
}
1558
}
1559
close(devnull);
1560
}
1561
return true;
1805
1562
}
1806
1563
1807
__attribute__((nonnull, warn_unused_result))
1808
error_t bring_up_interface(const char *const interface,
1809
const float delay){
1810
error_t old_errno = errno;
1564
int bring_up_interface(const char * const interface, const float delay){
1565
int sd = -1;
1566
int old_errno = errno;
1567
int ret_errno = 0;
1811
1568
int ret;
1812
1569
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1570
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1814
1571
if(if_index == 0){
1815
1572
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
1573
errno = old_errno;
1822
1579
return EINTR;
1823
1580
}
1824
1581
1825
if(not interface_is_up(interface)){
1826
error_t ret_errno = 0, ioctl_errno = 0;
1827
if(not get_flags(interface, &network)){
1828
ret_errno = errno;
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
network.ifr_flags |= IFF_UP; /* set flag */
1835
1836
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1837
if(sd == -1){
1838
ret_errno = errno;
1839
perror_plus("socket");
1840
errno = old_errno;
1841
return ret_errno;
1842
}
1843
1844
if(quit_now){
1845
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
errno = old_errno;
1850
return EINTR;
1851
}
1852
1853
if(debug){
1854
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1855
interface);
1856
}
1857
1858
/* Raise privileges */
1859
ret_errno = raise_privileges();
1860
if(ret_errno != 0){
1861
errno = ret_errno;
1862
perror_plus("Failed to raise privileges");
1863
}
1864
1865
#ifdef __linux__
1866
int ret_linux;
1867
bool restore_loglevel = false;
1868
if(ret_errno == 0){
1869
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1870
messages about the network interface to mess up the prompt */
1871
ret_linux = klogctl(8, NULL, 5);
1872
if(ret_linux == -1){
1873
perror_plus("klogctl");
1874
} else {
1875
restore_loglevel = true;
1876
}
1877
}
1878
#endif /* __linux__ */
1879
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1880
ioctl_errno = errno;
1881
#ifdef __linux__
1882
if(restore_loglevel){
1883
ret_linux = klogctl(7, NULL, 0);
1884
if(ret_linux == -1){
1885
perror_plus("klogctl");
1886
}
1887
}
1888
#endif /* __linux__ */
1889
1890
/* If raise_privileges() succeeded above */
1891
if(ret_errno == 0){
1892
/* Lower privileges */
1893
ret_errno = lower_privileges();
1894
if(ret_errno != 0){
1895
errno = ret_errno;
1896
perror_plus("Failed to lower privileges");
1897
}
1898
}
1899
1900
/* Close the socket */
1901
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1582
/* Re-raise priviliges */
1583
raise_privileges();
1584
1585
#ifdef __linux__
1586
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1587
messages about the network interface to mess up the prompt */
1588
ret = klogctl(8, NULL, 5);
1589
bool restore_loglevel = true;
1590
if(ret == -1){
1591
restore_loglevel = false;
1592
perror_plus("klogctl");
1593
}
1594
#endif /* __linux__ */
1595
1596
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1597
if(sd < 0){
1598
ret_errno = errno;
1599
perror_plus("socket");
1600
#ifdef __linux__
1601
if(restore_loglevel){
1602
ret = klogctl(7, NULL, 0);
1603
if(ret == -1){
1604
perror_plus("klogctl");
1605
}
1606
}
1607
#endif /* __linux__ */
1608
/* Lower privileges */
1609
lower_privileges();
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
ret_errno = errno;
1617
perror_plus("ioctl SIOCGIFFLAGS");
1618
#ifdef __linux__
1619
if(restore_loglevel){
1620
ret = klogctl(7, NULL, 0);
1621
if(ret == -1){
1622
perror_plus("klogctl");
1623
}
1624
}
1625
#endif /* __linux__ */
1626
/* Lower privileges */
1627
lower_privileges();
1628
errno = old_errno;
1629
return ret_errno;
1630
}
1631
if((network.ifr_flags & IFF_UP) == 0){
1632
network.ifr_flags |= IFF_UP;
1633
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1902
1634
if(ret == -1){
1903
perror_plus("close");
1904
}
1905
1906
if(ret_setflags == -1){
1907
errno = ioctl_errno;
1635
ret_errno = errno;
1908
1636
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1637
#ifdef __linux__
1638
if(restore_loglevel){
1639
ret = klogctl(7, NULL, 0);
1640
if(ret == -1){
1641
perror_plus("klogctl");
1642
}
1643
}
1644
#endif /* __linux__ */
1645
/* Lower privileges */
1646
lower_privileges();
1909
1647
errno = old_errno;
1910
return ioctl_errno;
1648
return ret_errno;
1911
1649
}
1912
} else if(debug){
1913
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1914
interface);
1915
1650
}
1916
1917
1651
/* Sleep checking until interface is running.
1918
1652
Check every 0.25s, up to total time of delay */
1919
1653
for(int i=0; i < delay * 4; i++){
1920
if(interface_is_running(interface)){
1654
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1655
if(ret == -1){
1656
perror_plus("ioctl SIOCGIFFLAGS");
1657
} else if(network.ifr_flags & IFF_RUNNING){
1921
1658
break;
1922
1659
}
1923
1660
struct timespec sleeptime = { .tv_nsec = 250000000 };
1926
1663
perror_plus("nanosleep");
1927
1664
}
1928
1665
}
1929
1930
errno = old_errno;
1931
return 0;
1932
}
1933
1934
__attribute__((nonnull, warn_unused_result))
1935
error_t take_down_interface(const char *const interface){
1936
error_t old_errno = errno;
1937
struct ifreq network;
1938
unsigned int if_index = if_nametoindex(interface);
1939
if(if_index == 0){
1940
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1941
errno = old_errno;
1942
return ENXIO;
1666
/* Close the socket */
1667
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1668
if(ret == -1){
1669
perror_plus("close");
1943
1670
}
1944
if(interface_is_up(interface)){
1945
error_t ret_errno = 0, ioctl_errno = 0;
1946
if(not get_flags(interface, &network) and debug){
1947
ret_errno = errno;
1948
fprintf_plus(stderr, "Failed to get flags for interface "
1949
"\"%s\"\n", interface);
1950
errno = old_errno;
1951
return ret_errno;
1952
}
1953
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1954
1955
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1956
if(sd == -1){
1957
ret_errno = errno;
1958
perror_plus("socket");
1959
errno = old_errno;
1960
return ret_errno;
1961
}
1962
1963
if(debug){
1964
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1965
interface);
1966
}
1967
1968
/* Raise privileges */
1969
ret_errno = raise_privileges();
1970
if(ret_errno != 0){
1971
errno = ret_errno;
1972
perror_plus("Failed to raise privileges");
1973
}
1974
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
1978
/* If raise_privileges() succeeded above */
1979
if(ret_errno == 0){
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1982
if(ret_errno != 0){
1983
errno = ret_errno;
1984
perror_plus("Failed to lower privileges");
1985
}
1986
}
1987
1988
/* Close the socket */
1989
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1671
#ifdef __linux__
1672
if(restore_loglevel){
1673
/* Restores kernel loglevel to default */
1674
ret = klogctl(7, NULL, 0);
1990
1675
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1997
errno = old_errno;
1998
return ioctl_errno;
1999
}
2000
} else if(debug){
2001
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2002
interface);
1676
perror_plus("klogctl");
1677
}
2003
1678
}
2004
1679
#endif /* __linux__ */
1680
/* Lower privileges */
1681
lower_privileges();
2005
1682
errno = old_errno;
2006
1683
return 0;
2007
1684
}
2008
1685
2009
1686
int main(int argc, char *argv[]){
2010
mandos_context mc = { .server = NULL, .dh_bits = 0,
2011
.priority = "SECURE256:!CTYPE-X.509:"
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2013
.interfaces = NULL, .interfaces_size = 0 };
2014
1687
AvahiSServiceBrowser *sb = NULL;
2015
error_t ret_errno;
1688
int error;
2016
1689
int ret;
2017
1690
intmax_t tmpmax;
2018
1691
char *tmp;
2019
1692
int exitcode = EXIT_SUCCESS;
2020
char *interfaces_to_take_down = NULL;
2021
size_t interfaces_to_take_down_size = 0;
2022
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2023
char old_tempdir[] = "/tmp/mandosXXXXXX";
2024
char *tempdir = NULL;
1693
const char *interface = "";
1694
struct ifreq network;
1695
int sd = -1;
1696
bool take_down_interface = false;
1697
char tempdir[] = "/tmp/mandosXXXXXX";
1698
bool tempdir_created = false;
2025
1699
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2026
1700
const char *seckey = PATHDIR "/" SECKEY;
2027
1701
const char *pubkey = PATHDIR "/" PUBKEY;
2028
char *interfaces_hooks = NULL;
2029
1702
2030
1703
bool gnutls_initialized = false;
2031
1704
bool gpgme_initialized = false;
2122
1795
connect_to = arg;
2123
1796
break;
2124
1797
case 'i': /* --interface */
2125
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2126
arg, (int)',');
2127
if(ret_errno != 0){
2128
argp_error(state, "%s", strerror(ret_errno));
2129
}
1798
interface = arg;
2130
1799
break;
2131
1800
case 's': /* --seckey */
2132
1801
seckey = arg;
2209
1878
/* Work around Debian bug #633582:
2210
1879
<http://bugs.debian.org/633582> */
2211
1880
2212
/* Re-raise privileges */
2213
ret_errno = raise_privileges();
2214
if(ret_errno != 0){
2215
errno = ret_errno;
2216
perror_plus("Failed to raise privileges");
2217
} else {
1881
/* Re-raise priviliges */
1882
if(raise_privileges() == 0){
2218
1883
struct stat st;
2219
1884
2220
1885
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2260
1925
}
2261
1926
2262
1927
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
}
2270
2271
/* Remove invalid interface names (except "none") */
2272
{
2273
char *interface = NULL;
2274
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2275
interface))){
2276
if(strcmp(interface, "none") != 0
2277
and if_nametoindex(interface) == 0){
2278
if(interface[0] != '\0'){
2279
fprintf_plus(stderr, "Not using nonexisting interface"
2280
" \"%s\"\n", interface);
2281
}
2282
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2283
interface = NULL;
1928
errno = 0;
1929
ret = seteuid(uid);
1930
if(ret == -1){
1931
perror_plus("seteuid");
2284
1932
}
2285
1933
}
2286
1934
}
2287
1935
2288
1936
/* Run network hooks */
2289
{
2290
if(mc.interfaces != NULL){
2291
interfaces_hooks = malloc(mc.interfaces_size);
2292
if(interfaces_hooks == NULL){
1937
if(not run_network_hooks("start", interface, delay)){
1938
goto end;
1939
}
1940
1941
if(not debug){
1942
avahi_set_log_function(empty_log);
1943
}
1944
1945
if(interface[0] == '\0'){
1946
struct dirent **direntries;
1947
/* First look for interfaces that are up */
1948
ret = scandir(sys_class_net, &direntries, up_interface,
1949
alphasort);
1950
if(ret == 0){
1951
/* No up interfaces, look for any good interfaces */
1952
free(direntries);
1953
ret = scandir(sys_class_net, &direntries, good_interface,
1954
alphasort);
1955
}
1956
if(ret >= 1){
1957
/* Pick the first interface returned */
1958
interface = strdup(direntries[0]->d_name);
1959
if(debug){
1960
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1961
}
1962
if(interface == NULL){
2293
1963
perror_plus("malloc");
1964
free(direntries);
1965
exitcode = EXIT_FAILURE;
2294
1966
goto end;
2295
1967
}
2296
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2297
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1968
free(direntries);
1969
} else {
1970
free(direntries);
1971
fprintf_plus(stderr, "Could not find a network interface\n");
1972
exitcode = EXIT_FAILURE;
1973
goto end;
2298
1974
}
2299
run_network_hooks("start", interfaces_hooks != NULL ?
2300
interfaces_hooks : "", delay);
2301
}
2302
2303
if(not debug){
2304
avahi_set_log_function(empty_log);
2305
1975
}
2306
1976
2307
1977
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2308
1978
from the signal handler */
2309
1979
/* Initialize the pseudo-RNG for Avahi */
2310
1980
srand((unsigned int) time(NULL));
2311
simple_poll = avahi_simple_poll_new();
2312
if(simple_poll == NULL){
1981
mc.simple_poll = avahi_simple_poll_new();
1982
if(mc.simple_poll == NULL){
2313
1983
fprintf_plus(stderr,
2314
1984
"Avahi: Failed to create simple poll object.\n");
2315
1985
exitcode = EX_UNAVAILABLE;
2379
2049
}
2380
2050
}
2381
2051
2382
/* If no interfaces were specified, make a list */
2383
if(mc.interfaces == NULL){
2384
struct dirent **direntries = NULL;
2385
/* Look for any good interfaces */
2386
ret = scandir(sys_class_net, &direntries, good_interface,
2387
alphasort);
2388
if(ret >= 1){
2389
/* Add all found interfaces to interfaces list */
2390
for(int i = 0; i < ret; ++i){
2391
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2392
direntries[i]->d_name);
2393
if(ret_errno != 0){
2394
errno = ret_errno;
2395
perror_plus("argz_add");
2396
free(direntries[i]);
2397
continue;
2398
}
2399
if(debug){
2400
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2401
direntries[i]->d_name);
2402
}
2403
free(direntries[i]);
2404
}
2405
free(direntries);
2406
} else {
2407
if(ret == 0){
2408
free(direntries);
2409
}
2410
fprintf_plus(stderr, "Could not find a network interface\n");
2411
exitcode = EXIT_FAILURE;
2412
goto end;
2413
}
2414
}
2415
2416
/* Bring up interfaces which are down, and remove any "none"s */
2417
{
2418
char *interface = NULL;
2419
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2420
interface))){
2421
/* If interface name is "none", stop bringing up interfaces.
2422
Also remove all instances of "none" from the list */
2423
if(strcmp(interface, "none") == 0){
2424
argz_delete(&mc.interfaces, &mc.interfaces_size,
2425
interface);
2426
interface = NULL;
2427
while((interface = argz_next(mc.interfaces,
2428
mc.interfaces_size, interface))){
2429
if(strcmp(interface, "none") == 0){
2430
argz_delete(&mc.interfaces, &mc.interfaces_size,
2431
interface);
2432
interface = NULL;
2433
}
2434
}
2435
break;
2436
}
2437
bool interface_was_up = interface_is_up(interface);
2438
errno = bring_up_interface(interface, delay);
2439
if(not interface_was_up){
2440
if(errno != 0){
2441
perror_plus("Failed to bring up interface");
2442
} else {
2443
errno = argz_add(&interfaces_to_take_down,
2444
&interfaces_to_take_down_size,
2445
interface);
2446
if(errno != 0){
2447
perror_plus("argz_add");
2448
}
2449
}
2450
}
2451
}
2452
if(debug and (interfaces_to_take_down == NULL)){
2453
fprintf_plus(stderr, "No interfaces were brought up\n");
2454
}
2455
}
2456
2457
/* If we only got one interface, explicitly use only that one */
2458
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2459
if(debug){
2460
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2461
mc.interfaces);
2462
}
2463
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2052
/* If the interface is down, bring it up */
2053
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2054
ret = bring_up_interface(interface, delay);
2055
if(ret != 0){
2056
errno = ret;
2057
perror_plus("Failed to bring up interface");
2058
}
2464
2059
}
2465
2060
2466
2061
if(quit_now){
2467
2062
goto end;
2468
2063
}
2469
2064
2470
ret = init_gnutls_global(pubkey, seckey, &mc);
2065
ret = init_gnutls_global(pubkey, seckey);
2471
2066
if(ret == -1){
2472
2067
fprintf_plus(stderr, "init_gnutls_global failed\n");
2473
2068
exitcode = EX_UNAVAILABLE;
2480
2075
goto end;
2481
2076
}
2482
2077
2483
/* Try /run/tmp before /tmp */
2484
tempdir = mkdtemp(run_tempdir);
2485
if(tempdir == NULL and errno == ENOENT){
2486
if(debug){
2487
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2488
run_tempdir, old_tempdir);
2489
}
2490
tempdir = mkdtemp(old_tempdir);
2491
}
2492
if(tempdir == NULL){
2078
if(mkdtemp(tempdir) == NULL){
2493
2079
perror_plus("mkdtemp");
2494
2080
goto end;
2495
2081
}
2082
tempdir_created = true;
2496
2083
2497
2084
if(quit_now){
2498
2085
goto end;
2499
2086
}
2500
2087
2501
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2088
if(not init_gpgme(pubkey, seckey, tempdir)){
2502
2089
fprintf_plus(stderr, "init_gpgme failed\n");
2503
2090
exitcode = EX_UNAVAILABLE;
2504
2091
goto end;
2525
2112
goto end;
2526
2113
}
2527
2114
2528
in_port_t port;
2115
uint16_t port;
2529
2116
errno = 0;
2530
2117
tmpmax = strtoimax(address+1, &tmp, 10);
2531
2118
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2532
or tmpmax != (in_port_t)tmpmax){
2119
or tmpmax != (uint16_t)tmpmax){
2533
2120
fprintf_plus(stderr, "Bad port number\n");
2534
2121
exitcode = EX_USAGE;
2535
2122
goto end;
2536
2123
}
2537
2124
2538
2125
if(quit_now){
2539
2126
goto end;
2540
2127
}
2541
2128
2542
port = (in_port_t)tmpmax;
2129
port = (uint16_t)tmpmax;
2543
2130
*address = '\0';
2544
2131
/* Colon in address indicates IPv6 */
2545
2132
int af;
2561
2148
}
2562
2149
2563
2150
while(not quit_now){
2564
ret = start_mandos_communication(address, port, if_index, af,
2565
&mc);
2151
ret = start_mandos_communication(address, port, if_index, af);
2566
2152
if(quit_now or ret == 0){
2567
2153
break;
2568
2154
}
2570
2156
fprintf_plus(stderr, "Retrying in %d seconds\n",
2571
2157
(int)retry_interval);
2572
2158
}
2573
sleep((unsigned int)retry_interval);
2159
sleep((int)retry_interval);
2574
2160
}
2575
2161
2576
if(not quit_now){
2162
if (not quit_now){
2577
2163
exitcode = EXIT_SUCCESS;
2578
2164
}
2579
2165
2594
2180
config.publish_domain = 0;
2595
2181
2596
2182
/* Allocate a new server */
2597
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2598
&config, NULL, NULL, &ret_errno);
2183
mc.server = avahi_server_new(avahi_simple_poll_get
2184
(mc.simple_poll), &config, NULL,
2185
NULL, &error);
2599
2186
2600
2187
/* Free the Avahi configuration data */
2601
2188
avahi_server_config_free(&config);
2604
2191
/* Check if creating the Avahi server object succeeded */
2605
2192
if(mc.server == NULL){
2606
2193
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2607
avahi_strerror(ret_errno));
2194
avahi_strerror(error));
2608
2195
exitcode = EX_UNAVAILABLE;
2609
2196
goto end;
2610
2197
}
2616
2203
/* Create the Avahi service browser */
2617
2204
sb = avahi_s_service_browser_new(mc.server, if_index,
2618
2205
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2619
NULL, 0, browse_callback,
2620
(void *)&mc);
2206
NULL, 0, browse_callback, NULL);
2621
2207
if(sb == NULL){
2622
2208
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2623
2209
avahi_strerror(avahi_server_errno(mc.server)));
2634
2220
if(debug){
2635
2221
fprintf_plus(stderr, "Starting Avahi loop search\n");
2636
2222
}
2637
2638
ret = avahi_loop_with_timeout(simple_poll,
2639
(int)(retry_interval * 1000), &mc);
2223
2224
ret = avahi_loop_with_timeout(mc.simple_poll,
2225
(int)(retry_interval * 1000));
2640
2226
if(debug){
2641
2227
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2642
2228
(ret == 0) ? "successfully" : "with error");
2649
2235
}
2650
2236
2651
2237
/* Cleanup things */
2652
free(mc.interfaces);
2653
2654
2238
if(sb != NULL)
2655
2239
avahi_s_service_browser_free(sb);
2656
2240
2657
2241
if(mc.server != NULL)
2658
2242
avahi_server_free(mc.server);
2659
2243
2660
if(simple_poll != NULL)
2661
avahi_simple_poll_free(simple_poll);
2244
if(mc.simple_poll != NULL)
2245
avahi_simple_poll_free(mc.simple_poll);
2662
2246
2663
2247
if(gnutls_initialized){
2664
2248
gnutls_certificate_free_credentials(mc.cred);
2676
2260
mc.current_server->prev->next = NULL;
2677
2261
while(mc.current_server != NULL){
2678
2262
server *next = mc.current_server->next;
2679
#ifdef __GNUC__
2680
#pragma GCC diagnostic push
2681
#pragma GCC diagnostic ignored "-Wcast-qual"
2682
#endif
2683
free((char *)(mc.current_server->ip));
2684
#ifdef __GNUC__
2685
#pragma GCC diagnostic pop
2686
#endif
2687
2263
free(mc.current_server);
2688
2264
mc.current_server = next;
2689
2265
}
2690
2266
}
2691
2267
2692
/* Re-raise privileges */
2268
/* Run network hooks */
2269
run_network_hooks("stop", interface, delay);
2270
2271
/* Re-raise priviliges */
2693
2272
{
2694
ret_errno = raise_privileges();
2695
if(ret_errno != 0){
2696
errno = ret_errno;
2697
perror_plus("Failed to raise privileges");
2698
} else {
2699
2700
/* Run network hooks */
2701
run_network_hooks("stop", interfaces_hooks != NULL ?
2702
interfaces_hooks : "", delay);
2703
2704
/* Take down the network interfaces which were brought up */
2705
{
2706
char *interface = NULL;
2707
while((interface=argz_next(interfaces_to_take_down,
2708
interfaces_to_take_down_size,
2709
interface))){
2710
ret_errno = take_down_interface(interface);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("Failed to take down interface");
2714
}
2715
}
2716
if(debug and (interfaces_to_take_down == NULL)){
2717
fprintf_plus(stderr, "No interfaces needed to be taken"
2718
" down\n");
2719
}
2720
}
2721
}
2273
raise_privileges();
2722
2274
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("Failed to lower privileges permanently");
2275
/* Take down the network interface */
2276
if(take_down_interface and geteuid() == 0){
2277
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2278
if(ret == -1){
2279
perror_plus("ioctl SIOCGIFFLAGS");
2280
} else if(network.ifr_flags & IFF_UP){
2281
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2282
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2283
if(ret == -1){
2284
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2285
}
2286
}
2287
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2288
if(ret == -1){
2289
perror_plus("close");
2290
}
2727
2291
}
2728
2292
}
2729
2730
free(interfaces_to_take_down);
2731
free(interfaces_hooks);
2293
/* Lower privileges permanently */
2294
errno = 0;
2295
ret = setuid(uid);
2296
if(ret == -1){
2297
perror_plus("setuid");
2298
}
2732
2299
2733
2300
/* Removes the GPGME temp directory and all files inside */
2734
if(tempdir != NULL){
2301
if(tempdir_created){
2735
2302
struct dirent **direntries = NULL;
2736
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2737
O_NOFOLLOW));
2738
if(tempdir_fd == -1){
2739
perror_plus("open");
2740
} else {
2741
#ifdef __GLIBC__
2742
#if __GLIBC_PREREQ(2, 15)
2743
int numentries = scandirat(tempdir_fd, ".", &direntries,
2744
notdotentries, alphasort);
2745
#else /* not __GLIBC_PREREQ(2, 15) */
2746
int numentries = scandir(tempdir, &direntries, notdotentries,
2747
alphasort);
2748
#endif /* not __GLIBC_PREREQ(2, 15) */
2749
#else /* not __GLIBC__ */
2750
int numentries = scandir(tempdir, &direntries, notdotentries,
2751
alphasort);
2752
#endif /* not __GLIBC__ */
2753
if(numentries >= 0){
2754
for(int i = 0; i < numentries; i++){
2755
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2756
if(ret == -1){
2757
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2758
" \"%s\", 0): %s\n", tempdir,
2759
direntries[i]->d_name, strerror(errno));
2760
}
2761
free(direntries[i]);
2762
}
2763
2764
/* need to clean even if 0 because man page doesn't specify */
2765
free(direntries);
2766
if(numentries == -1){
2767
perror_plus("scandir");
2768
}
2769
ret = rmdir(tempdir);
2770
if(ret == -1 and errno != ENOENT){
2771
perror_plus("rmdir");
2772
}
2303
struct dirent *direntry = NULL;
2304
int numentries = scandir(tempdir, &direntries, notdotentries,
2305
alphasort);
2306
if (numentries > 0){
2307
for(int i = 0; i < numentries; i++){
2308
direntry = direntries[i];
2309
char *fullname = NULL;
2310
ret = asprintf(&fullname, "%s/%s", tempdir,
2311
direntry->d_name);
2312
if(ret < 0){
2313
perror_plus("asprintf");
2314
continue;
2315
}
2316
ret = remove(fullname);
2317
if(ret == -1){
2318
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2319
strerror(errno));
2320
}
2321
free(fullname);
2773
2322
}
2774
TEMP_FAILURE_RETRY(close(tempdir_fd));
2323
}
2324
2325
/* need to clean even if 0 because man page doesn't specify */
2326
free(direntries);
2327
if (numentries == -1){
2328
perror_plus("scandir");
2329
}
2330
ret = rmdir(tempdir);
2331
if(ret == -1 and errno != ENOENT){
2332
perror_plus("rmdir");
2775
2333
}
2776
2334
}
2777
2335
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0