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- Committer: Teddy Hogeborn
- Date: 2011-11-28 22:15:04 UTC
- mto: (505.2.13 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111128221504-aij86bkvdafxino5
* Makefile (install-client-nokey): Create network hook directory.
* debian/mandos-client.README.Debian: Corrected mail address.
* debian/mandos-client.README.Debian: Corrected mail address.
- 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(), _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
uid_t uid = 65534;
147
gid_t gid = 65534;
148
138
149
139
/* Doubly linked list that need to be circularly linked when used */
150
140
typedef struct server{
151
141
const char *ip;
152
in_port_t port;
142
uint16_t port;
153
143
AvahiIfIndex if_index;
154
144
int af;
155
145
struct timespec last_seen;
159
149
160
150
/* Used for passing in values through the Avahi callback functions */
161
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
162
153
AvahiServer *server;
163
154
gnutls_certificate_credentials_t cred;
164
155
unsigned int dh_bits;
166
157
const char *priority;
167
158
gpgme_ctx_t ctx;
168
159
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
160
} mandos_context;
172
161
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
175
167
176
168
sig_atomic_t quit_now = 0;
177
169
int signal_received = 0;
178
170
179
171
/* Function to use when printing errors */
180
172
void perror_plus(const char *print_text){
181
int e = errno;
182
173
fprintf(stderr, "Mandos plugin %s: ",
183
174
program_invocation_short_name);
184
errno = e;
185
175
perror(print_text);
186
176
}
187
177
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
178
int fprintf_plus(FILE *stream, const char *format, ...){
190
179
va_list ap;
191
180
va_start (ap, format);
192
181
193
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
183
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
185
}
197
186
198
187
/*
200
189
* bytes. "buffer_capacity" is how much is currently allocated,
201
190
* "buffer_length" is how much is already used.
202
191
*/
203
__attribute__((nonnull, warn_unused_result))
204
192
size_t incbuffer(char **buffer, size_t buffer_length,
205
193
size_t buffer_capacity){
206
194
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;
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
213
197
return 0;
214
198
}
215
*buffer = new_buf;
216
199
buffer_capacity += BUFFER_SIZE;
217
200
}
218
201
return buffer_capacity;
219
202
}
220
203
221
204
/* 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){
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
225
207
int ret;
226
208
server *new_server = malloc(sizeof(server));
227
209
if(new_server == NULL){
228
210
perror_plus("malloc");
229
return false;
211
return -1;
230
212
}
231
213
*new_server = (server){ .ip = strdup(ip),
232
214
.port = port,
234
216
.af = af };
235
217
if(new_server->ip == NULL){
236
218
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
return false;
219
return -1;
253
220
}
254
221
/* Special case of first server */
255
if(*current_server == NULL){
222
if (mc.current_server == NULL){
256
223
new_server->next = new_server;
257
224
new_server->prev = new_server;
258
*current_server = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
259
227
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
263
230
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
267
239
}
268
240
269
241
/*
270
242
* Initialize GPGME.
271
243
*/
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){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
277
246
gpgme_error_t rc;
278
247
gpgme_engine_info_t engine_info;
279
248
249
280
250
/*
281
251
* Helper function to insert pub and seckey to the engine keyring.
282
252
*/
283
bool import_key(const char * const filename){
253
bool import_key(const char *filename){
284
254
int ret;
285
255
int fd;
286
256
gpgme_data_t pgp_data;
298
268
return false;
299
269
}
300
270
301
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
302
272
if(rc != GPG_ERR_NO_ERROR){
303
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
274
gpgme_strsource(rc), gpgme_strerror(rc));
348
318
}
349
319
350
320
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
352
322
if(rc != GPG_ERR_NO_ERROR){
353
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
337
* Decrypt OpenPGP data.
368
338
* Returns -1 on error
369
339
*/
370
__attribute__((nonnull, warn_unused_result))
371
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
341
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
342
char **plaintext){
375
343
gpgme_data_t dh_crypto, dh_plain;
376
344
gpgme_error_t rc;
377
345
ssize_t ret;
403
371
404
372
/* Decrypt data from the cryptotext data buffer to the plaintext
405
373
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
375
if(rc != GPG_ERR_NO_ERROR){
408
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
377
gpgme_strsource(rc), gpgme_strerror(rc));
410
378
plaintext_length = -1;
411
379
if(debug){
412
380
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
414
382
if(result == NULL){
415
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
384
} else {
493
461
return plaintext_length;
494
462
}
495
463
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);
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
467
if(ret == NULL)
468
ret = "(unknown)";
469
return ret;
507
470
}
508
471
509
472
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
473
static void debuggnutls(__attribute__((unused)) int level,
512
474
const char* string){
513
475
fprintf_plus(stderr, "GnuTLS: %s", string);
514
476
}
515
477
516
__attribute__((nonnull, warn_unused_result))
517
478
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
mandos_context *mc){
479
const char *seckeyfilename){
520
480
int ret;
521
unsigned int uret;
522
481
523
482
if(debug){
524
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
540
499
}
541
500
542
501
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
503
if(ret != GNUTLS_E_SUCCESS){
545
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
505
safer_gnutls_strerror(ret));
556
515
}
557
516
558
517
ret = gnutls_certificate_set_openpgp_key_file
559
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
560
519
GNUTLS_OPENPGP_FMT_BASE64);
561
520
if(ret != GNUTLS_E_SUCCESS){
562
521
fprintf_plus(stderr,
568
527
}
569
528
570
529
/* GnuTLS server initialization */
571
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
572
531
if(ret != GNUTLS_E_SUCCESS){
573
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
533
" initialization: %s\n",
575
534
safer_gnutls_strerror(ret));
576
535
goto globalfail;
577
536
}
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);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
680
538
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));
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
683
541
goto globalfail;
684
542
}
685
543
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
687
545
688
546
return 0;
689
547
690
548
globalfail:
691
549
692
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
693
551
gnutls_global_deinit();
694
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
695
553
return -1;
696
554
}
697
555
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
701
557
int ret;
702
558
/* GnuTLS session creation */
703
559
do {
715
571
{
716
572
const char *err;
717
573
do {
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
719
575
if(quit_now){
720
576
gnutls_deinit(*session);
721
577
return -1;
732
588
733
589
do {
734
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
735
mc->cred);
591
mc.cred);
736
592
if(quit_now){
737
593
gnutls_deinit(*session);
738
594
return -1;
748
604
/* ignore client certificate if any. */
749
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
606
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
752
608
753
609
return 0;
754
610
}
758
614
__attribute__((unused)) const char *txt){}
759
615
760
616
/* 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,
617
static int start_mandos_communication(const char *ip, uint16_t port,
763
618
AvahiIfIndex if_index,
764
int af, mandos_context *mc){
619
int af){
765
620
int ret, tcp_sd = -1;
766
621
ssize_t sret;
767
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
768
626
char *buffer = NULL;
769
627
char *decrypted_buffer = NULL;
770
628
size_t buffer_length = 0;
794
652
return -1;
795
653
}
796
654
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);
655
ret = init_gnutls_session(&session);
830
656
if(ret != 0){
831
657
return -1;
832
658
}
833
659
834
660
if(debug){
835
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
836
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
837
663
}
838
664
839
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
851
677
852
678
memset(&to, 0, sizeof(to));
853
679
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);
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
856
682
} 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);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
859
685
}
860
686
if(ret < 0 ){
861
687
int e = errno;
870
696
goto mandos_end;
871
697
}
872
698
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)){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
876
706
if(if_index == AVAHI_IF_UNSPEC){
877
707
fprintf_plus(stderr, "An IPv6 link-local address is"
878
708
" incomplete without a network interface\n");
880
710
goto mandos_end;
881
711
}
882
712
/* Set the network interface number as scope */
883
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
884
714
}
885
715
} else {
886
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
887
719
}
888
720
889
721
if(quit_now){
897
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
730
perror_plus("if_indextoname");
899
731
} else {
900
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
901
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
902
734
}
903
735
} else {
904
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
905
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
906
738
}
907
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
908
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
909
742
if(af == AF_INET6){
910
ret = getnameinfo((struct sockaddr *)&to,
911
sizeof(struct sockaddr_in6),
912
addrstr, sizeof(addrstr), NULL, 0,
913
NI_NUMERICHOST);
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
914
745
} else {
915
ret = getnameinfo((struct sockaddr *)&to,
916
sizeof(struct sockaddr_in),
917
addrstr, sizeof(addrstr), NULL, 0,
918
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
919
748
}
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);
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
926
755
}
927
756
}
928
757
932
761
}
933
762
934
763
if(af == AF_INET6){
935
ret = connect(tcp_sd, (struct sockaddr *)&to,
936
sizeof(struct sockaddr_in6));
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
937
765
} else {
938
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
939
sizeof(struct sockaddr_in));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
940
767
}
941
768
if(ret < 0){
942
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
943
770
int e = errno;
944
771
perror_plus("connect");
945
772
errno = e;
991
818
goto mandos_end;
992
819
}
993
820
994
/* This casting via intptr_t is to eliminate warning about casting
995
an int to a pointer type. This is exactly how the GnuTLS Guile
996
function "set-session-transport-fd!" does it. */
997
gnutls_transport_set_ptr(session,
998
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
999
823
1000
824
if(quit_now){
1001
825
errno = EINTR;
1106
930
if(buffer_length > 0){
1107
931
ssize_t decrypted_buffer_size;
1108
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1109
&decrypted_buffer, mc);
933
&decrypted_buffer);
1110
934
if(decrypted_buffer_size >= 0){
1111
935
1112
936
written = 0;
1160
984
return retval;
1161
985
}
1162
986
1163
__attribute__((nonnull))
1164
987
static void resolve_callback(AvahiSServiceResolver *r,
1165
988
AvahiIfIndex interface,
1166
989
AvahiProtocol proto,
1174
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1175
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1176
999
flags,
1177
void *mc){
1178
if(r == NULL){
1179
return;
1180
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1181
1002
1182
1003
/* Called whenever a service has been resolved successfully or
1183
1004
timed out */
1184
1005
1185
1006
if(quit_now){
1186
avahi_s_service_resolver_free(r);
1187
1007
return;
1188
1008
}
1189
1009
1193
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1194
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1195
1015
domain,
1196
avahi_strerror(avahi_server_errno
1197
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1198
1017
break;
1199
1018
1200
1019
case AVAHI_RESOLVER_FOUND:
1206
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1207
1026
host_name, ip, (intmax_t)interface, port);
1208
1027
}
1209
int ret = start_mandos_communication(ip, (in_port_t)port,
1210
interface,
1211
avahi_proto_to_af(proto),
1212
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1213
1030
if(ret == 0){
1214
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1215
1032
} else {
1216
if(not add_server(ip, (in_port_t)port, interface,
1217
avahi_proto_to_af(proto),
1218
&((mandos_context*)mc)->current_server)){
1219
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1220
" list\n", name);
1221
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1222
1035
}
1223
1036
}
1224
1037
}
1234
1047
const char *domain,
1235
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1236
1049
flags,
1237
void *mc){
1238
if(b == NULL){
1239
return;
1240
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1241
1052
1242
1053
/* Called whenever a new services becomes available on the LAN or
1243
1054
is removed from the LAN */
1251
1062
case AVAHI_BROWSER_FAILURE:
1252
1063
1253
1064
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);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1257
1067
return;
1258
1068
1259
1069
case AVAHI_BROWSER_NEW:
1262
1072
the callback function is called the Avahi server will free the
1263
1073
resolver for us. */
1264
1074
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)
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1269
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1270
1079
" %s\n", name,
1271
avahi_strerror(avahi_server_errno
1272
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1273
1081
break;
1274
1082
1275
1083
case AVAHI_BROWSER_REMOVE:
1294
1102
signal_received = sig;
1295
1103
int old_errno = errno;
1296
1104
/* set main loop to exit */
1297
if(simple_poll != NULL){
1298
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1299
1107
}
1300
1108
errno = old_errno;
1301
1109
}
1302
1110
1303
__attribute__((nonnull, warn_unused_result))
1304
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1305
1112
int ret;
1306
error_t ret_errno;
1307
1113
1308
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1309
1115
if(s < 0){
1310
ret_errno = errno;
1311
1116
perror_plus("socket");
1312
errno = ret_errno;
1313
1117
return false;
1314
1118
}
1315
1119
strcpy(ifr->ifr_name, ifname);
1316
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1317
1121
if(ret == -1){
1318
1122
if(debug){
1319
ret_errno = errno;
1320
1123
perror_plus("ioctl SIOCGIFFLAGS");
1321
errno = ret_errno;
1322
1124
}
1323
1125
return false;
1324
1126
}
1325
1127
return true;
1326
1128
}
1327
1129
1328
__attribute__((nonnull, warn_unused_result))
1329
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1330
1131
1331
1132
/* Reject the loopback device */
1373
1174
* corresponds to an acceptable network device.
1374
1175
* (This function is passed to scandir(3) as a filter function.)
1375
1176
*/
1376
__attribute__((nonnull, warn_unused_result))
1377
1177
int good_interface(const struct dirent *if_entry){
1378
1178
if(if_entry->d_name[0] == '.'){
1379
1179
return 0;
1395
1195
}
1396
1196
1397
1197
/*
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))
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1432
1240
int notdotentries(const struct dirent *direntry){
1433
1241
/* Skip "." and ".." */
1434
1242
if(direntry->d_name[0] == '.'
1441
1249
}
1442
1250
1443
1251
/* Is this directory entry a runnable program? */
1444
__attribute__((nonnull, warn_unused_result))
1445
1252
int runnable_hook(const struct dirent *direntry){
1446
1253
int ret;
1447
1254
size_t sret;
1455
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1456
1263
"abcdefghijklmnopqrstuvwxyz"
1457
1264
"0123456789"
1458
"_.-");
1265
"_-");
1459
1266
if((direntry->d_name)[sret] != '\0'){
1460
1267
/* Contains non-allowed characters */
1461
1268
if(debug){
1465
1272
return 0;
1466
1273
}
1467
1274
1468
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1469
1283
if(ret == -1){
1470
1284
if(debug){
1471
1285
perror_plus("Could not stat hook");
1495
1309
return 1;
1496
1310
}
1497
1311
1498
__attribute__((nonnull, warn_unused_result))
1499
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1500
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1501
1313
int ret;
1502
1314
struct timespec now;
1503
1315
struct timespec waited_time;
1504
1316
intmax_t block_time;
1505
1317
1506
1318
while(true){
1507
if(mc->current_server == NULL){
1508
if(debug){
1319
if(mc.current_server == NULL){
1320
if (debug){
1509
1321
fprintf_plus(stderr, "Wait until first server is found."
1510
1322
" No timeout!\n");
1511
1323
}
1512
1324
ret = avahi_simple_poll_iterate(s, -1);
1513
1325
} else {
1514
if(debug){
1326
if (debug){
1515
1327
fprintf_plus(stderr, "Check current_server if we should run"
1516
1328
" it, or wait\n");
1517
1329
}
1524
1336
/* Calculating in ms how long time between now and server
1525
1337
who we visted longest time ago. Now - last seen. */
1526
1338
waited_time.tv_sec = (now.tv_sec
1527
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1528
1340
waited_time.tv_nsec = (now.tv_nsec
1529
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1530
1342
/* total time is 10s/10,000ms.
1531
1343
Converting to s from ms by dividing by 1,000,
1532
1344
and ns to ms by dividing by 1,000,000. */
1534
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1535
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1536
1348
1537
if(debug){
1349
if (debug){
1538
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1539
1351
block_time);
1540
1352
}
1541
1353
1542
1354
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);
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1547
1359
if(ret == 0){
1548
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1549
1361
return 0;
1550
1362
}
1551
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1552
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1553
1365
if(ret == -1){
1554
1366
perror_plus("clock_gettime");
1555
1367
return -1;
1556
1368
}
1557
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1558
1370
block_time = 0; /* Call avahi to find new Mandos
1559
1371
servers, but don't block */
1560
1372
}
1562
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1563
1375
}
1564
1376
if(ret != 0){
1565
if(ret > 0 or errno != EINTR){
1377
if (ret > 0 or errno != EINTR){
1566
1378
return (ret != 1) ? ret : 0;
1567
1379
}
1568
1380
}
1569
1381
}
1570
1382
}
1571
1383
1572
/* 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;
1577
if(seteuid(0) == -1){
1578
ret_errno = errno;
1579
}
1580
errno = old_errno;
1581
return ret_errno;
1582
}
1583
1584
/* 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();
1589
if(ret_errno != 0){
1590
errno = old_errno;
1591
return ret_errno;
1592
}
1593
if(setuid(0) == -1){
1594
ret_errno = errno;
1595
}
1596
errno = old_errno;
1597
return ret_errno;
1598
}
1599
1600
/* 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;
1605
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,
1384
bool run_network_hooks(const char *mode, const char *interface,
1626
1385
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__ */
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1654
1391
if(numhooks == -1){
1655
1392
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){
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1728
1400
perror_plus("asprintf");
1729
_exit(EX_OSERR);
1730
}
1731
ret = setenv("DELAY", delaystring, 1);
1732
if(ret == -1){
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1437
close(devnull);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1440
if(ret == -1){
1441
perror_plus("setenv");
1442
_exit(EX_OSERR);
1443
}
1444
ret = setenv("DEVICE", interface, 1);
1445
if(ret == -1){
1446
perror_plus("setenv");
1447
_exit(EX_OSERR);
1448
}
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1450
if(ret == -1){
1451
perror_plus("setenv");
1452
_exit(EX_OSERR);
1453
}
1454
ret = setenv("MODE", mode, 1);
1455
if(ret == -1){
1456
perror_plus("setenv");
1457
_exit(EX_OSERR);
1458
}
1459
char *delaystring;
1460
ret = asprintf(&delaystring, "%f", delay);
1461
if(ret == -1){
1462
perror_plus("asprintf");
1463
_exit(EX_OSERR);
1464
}
1465
ret = setenv("DELAY", delaystring, 1);
1466
if(ret == -1){
1467
free(delaystring);
1468
perror_plus("setenv");
1469
_exit(EX_OSERR);
1470
}
1733
1471
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;
1785
} 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);
1805
}
1806
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;
1811
int ret;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
1820
if(quit_now){
1821
errno = old_errno;
1822
return EINTR;
1823
}
1824
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));
1902
if(ret == -1){
1903
perror_plus("close");
1904
}
1905
1906
if(ret_setflags == -1){
1907
errno = ioctl_errno;
1908
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1909
errno = old_errno;
1910
return ioctl_errno;
1911
}
1912
} else if(debug){
1913
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1914
interface);
1915
}
1916
1917
/* Sleep checking until interface is running.
1918
Check every 0.25s, up to total time of delay */
1919
for(int i=0; i < delay * 4; i++){
1920
if(interface_is_running(interface)){
1921
break;
1922
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
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;
1943
}
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));
1990
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);
2003
}
2004
2005
errno = old_errno;
2006
return 0;
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1474
} else {
1475
int status;
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1478
free(fullname);
1479
continue;
1480
}
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1492
WTERMSIG(status));
1493
free(fullname);
1494
continue;
1495
} else {
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1498
free(fullname);
1499
continue;
1500
}
1501
}
1502
free(fullname);
1503
if(debug){
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1505
direntry->d_name);
1506
}
1507
}
1508
close(devnull);
1509
}
1510
return true;
2007
1511
}
2008
1512
2009
1513
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
1514
AvahiSServiceBrowser *sb = NULL;
2015
error_t ret_errno;
1515
int error;
2016
1516
int ret;
2017
1517
intmax_t tmpmax;
2018
1518
char *tmp;
2019
1519
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;
1520
const char *interface = "";
1521
struct ifreq network;
1522
int sd = -1;
1523
bool take_down_interface = false;
1524
uid_t uid;
1525
gid_t gid;
1526
char tempdir[] = "/tmp/mandosXXXXXX";
1527
bool tempdir_created = false;
2025
1528
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2026
1529
const char *seckey = PATHDIR "/" SECKEY;
2027
1530
const char *pubkey = PATHDIR "/" PUBKEY;
2028
char *interfaces_hooks = NULL;
2029
1531
2030
1532
bool gnutls_initialized = false;
2031
1533
bool gpgme_initialized = false;
2093
1595
.group = 2 },
2094
1596
{ .name = "retry", .key = 132,
2095
1597
.arg = "SECONDS",
2096
.doc = "Retry interval used when denied by the Mandos server",
1598
.doc = "Retry interval used when denied by the mandos server",
2097
1599
.group = 2 },
2098
1600
{ .name = "network-hook-dir", .key = 133,
2099
1601
.arg = "DIR",
2122
1624
connect_to = arg;
2123
1625
break;
2124
1626
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
}
1627
interface = arg;
2130
1628
break;
2131
1629
case 's': /* --seckey */
2132
1630
seckey = arg;
2175
1673
argp_state_help(state, state->out_stream,
2176
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2177
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
2178
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2179
1679
exit(argp_err_exit_status);
2180
1680
break;
2209
1709
/* Work around Debian bug #633582:
2210
1710
<http://bugs.debian.org/633582> */
2211
1711
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");
1712
/* Re-raise priviliges */
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
2217
1717
} else {
2218
1718
struct stat st;
2219
1719
2260
1760
}
2261
1761
2262
1762
/* 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;
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
2284
1767
}
2285
1768
}
2286
1769
}
2287
1770
2288
1771
/* Run network hooks */
2289
{
2290
if(mc.interfaces != NULL){
2291
interfaces_hooks = malloc(mc.interfaces_size);
2292
if(interfaces_hooks == NULL){
2293
perror_plus("malloc");
2294
goto end;
2295
}
2296
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2297
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2298
}
2299
run_network_hooks("start", interfaces_hooks != NULL ?
2300
interfaces_hooks : "", delay);
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
2301
1774
}
2302
1775
2303
1776
if(not debug){
2304
1777
avahi_set_log_function(empty_log);
2305
1778
}
2306
1779
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
2307
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2308
1813
from the signal handler */
2309
1814
/* Initialize the pseudo-RNG for Avahi */
2310
1815
srand((unsigned int) time(NULL));
2311
simple_poll = avahi_simple_poll_new();
2312
if(simple_poll == NULL){
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
2313
1818
fprintf_plus(stderr,
2314
1819
"Avahi: Failed to create simple poll object.\n");
2315
1820
exitcode = EX_UNAVAILABLE;
2379
1884
}
2380
1885
}
2381
1886
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;
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1893
goto end;
1894
}
1895
1896
if(quit_now){
1897
goto end;
1898
}
1899
1900
/* Re-raise priviliges */
1901
errno = 0;
1902
ret = seteuid(0);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
1907
#ifdef __linux__
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1912
if(ret == -1){
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
1915
}
1916
#endif /* __linux__ */
1917
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1919
if(sd < 0){
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1922
#ifdef __linux__
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
ret = seteuid(uid);
1933
if(ret == -1){
1934
perror_plus("seteuid");
1935
}
1936
goto end;
1937
}
1938
strcpy(network.ifr_name, interface);
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1940
if(ret == -1){
1941
perror_plus("ioctl SIOCGIFFLAGS");
1942
#ifdef __linux__
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1945
if(ret == -1){
1946
perror_plus("klogctl");
1947
}
1948
}
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1952
errno = 0;
1953
ret = seteuid(uid);
1954
if(ret == -1){
1955
perror_plus("seteuid");
1956
}
1957
goto end;
1958
}
1959
if((network.ifr_flags & IFF_UP) == 0){
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1963
if(ret == -1){
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1967
#ifdef __linux__
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1970
if(ret == -1){
1971
perror_plus("klogctl");
2433
1972
}
2434
1973
}
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1976
errno = 0;
1977
ret = seteuid(uid);
1978
if(ret == -1){
1979
perror_plus("seteuid");
1980
}
1981
goto end;
1982
}
1983
}
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1986
for(int i=0; i < delay * 4; i++){
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1988
if(ret == -1){
1989
perror_plus("ioctl SIOCGIFFLAGS");
1990
} else if(network.ifr_flags & IFF_RUNNING){
2435
1991
break;
2436
1992
}
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);
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
ret = nanosleep(&sleeptime, NULL);
1995
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1997
}
1998
}
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
if(ret == -1){
2003
perror_plus("close");
2004
}
2005
}
2006
#ifdef __linux__
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2010
if(ret == -1){
2011
perror_plus("klogctl");
2012
}
2013
}
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2016
errno = 0;
2017
/* Lower privileges */
2018
ret = seteuid(uid);
2019
if(ret == -1){
2020
perror_plus("seteuid");
2021
}
2464
2022
}
2465
2023
2466
2024
if(quit_now){
2467
2025
goto end;
2468
2026
}
2469
2027
2470
ret = init_gnutls_global(pubkey, seckey, &mc);
2028
ret = init_gnutls_global(pubkey, seckey);
2471
2029
if(ret == -1){
2472
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2473
2031
exitcode = EX_UNAVAILABLE;
2480
2038
goto end;
2481
2039
}
2482
2040
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){
2041
if(mkdtemp(tempdir) == NULL){
2493
2042
perror_plus("mkdtemp");
2494
2043
goto end;
2495
2044
}
2045
tempdir_created = true;
2496
2046
2497
2047
if(quit_now){
2498
2048
goto end;
2499
2049
}
2500
2050
2501
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2502
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2503
2053
exitcode = EX_UNAVAILABLE;
2504
2054
goto end;
2514
2064
/* Connect directly, do not use Zeroconf */
2515
2065
/* (Mainly meant for debugging) */
2516
2066
char *address = strrchr(connect_to, ':');
2517
2518
2067
if(address == NULL){
2519
2068
fprintf_plus(stderr, "No colon in address\n");
2520
2069
exitcode = EX_USAGE;
2525
2074
goto end;
2526
2075
}
2527
2076
2528
in_port_t port;
2077
uint16_t port;
2529
2078
errno = 0;
2530
2079
tmpmax = strtoimax(address+1, &tmp, 10);
2531
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2532
or tmpmax != (in_port_t)tmpmax){
2081
or tmpmax != (uint16_t)tmpmax){
2533
2082
fprintf_plus(stderr, "Bad port number\n");
2534
2083
exitcode = EX_USAGE;
2535
2084
goto end;
2536
2085
}
2537
2086
2538
2087
if(quit_now){
2539
2088
goto end;
2540
2089
}
2541
2090
2542
port = (in_port_t)tmpmax;
2091
port = (uint16_t)tmpmax;
2543
2092
*address = '\0';
2544
2093
/* Colon in address indicates IPv6 */
2545
2094
int af;
2561
2110
}
2562
2111
2563
2112
while(not quit_now){
2564
ret = start_mandos_communication(address, port, if_index, af,
2565
&mc);
2113
ret = start_mandos_communication(address, port, if_index, af);
2566
2114
if(quit_now or ret == 0){
2567
2115
break;
2568
2116
}
2570
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2571
2119
(int)retry_interval);
2572
2120
}
2573
sleep((unsigned int)retry_interval);
2121
sleep((int)retry_interval);
2574
2122
}
2575
2123
2576
if(not quit_now){
2124
if (not quit_now){
2577
2125
exitcode = EXIT_SUCCESS;
2578
2126
}
2579
2127
2594
2142
config.publish_domain = 0;
2595
2143
2596
2144
/* Allocate a new server */
2597
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2598
&config, NULL, NULL, &ret_errno);
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2599
2148
2600
2149
/* Free the Avahi configuration data */
2601
2150
avahi_server_config_free(&config);
2604
2153
/* Check if creating the Avahi server object succeeded */
2605
2154
if(mc.server == NULL){
2606
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2607
avahi_strerror(ret_errno));
2156
avahi_strerror(error));
2608
2157
exitcode = EX_UNAVAILABLE;
2609
2158
goto end;
2610
2159
}
2616
2165
/* Create the Avahi service browser */
2617
2166
sb = avahi_s_service_browser_new(mc.server, if_index,
2618
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2619
NULL, 0, browse_callback,
2620
(void *)&mc);
2168
NULL, 0, browse_callback, NULL);
2621
2169
if(sb == NULL){
2622
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2623
2171
avahi_strerror(avahi_server_errno(mc.server)));
2634
2182
if(debug){
2635
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2636
2184
}
2637
2638
ret = avahi_loop_with_timeout(simple_poll,
2639
(int)(retry_interval * 1000), &mc);
2185
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2640
2188
if(debug){
2641
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2642
2190
(ret == 0) ? "successfully" : "with error");
2649
2197
}
2650
2198
2651
2199
/* Cleanup things */
2652
free(mc.interfaces);
2653
2654
2200
if(sb != NULL)
2655
2201
avahi_s_service_browser_free(sb);
2656
2202
2657
2203
if(mc.server != NULL)
2658
2204
avahi_server_free(mc.server);
2659
2205
2660
if(simple_poll != NULL)
2661
avahi_simple_poll_free(simple_poll);
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2662
2208
2663
2209
if(gnutls_initialized){
2664
2210
gnutls_certificate_free_credentials(mc.cred);
2676
2222
mc.current_server->prev->next = NULL;
2677
2223
while(mc.current_server != NULL){
2678
2224
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
2225
free(mc.current_server);
2688
2226
mc.current_server = next;
2689
2227
}
2690
2228
}
2691
2229
2692
/* Re-raise privileges */
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2693
2234
{
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
}
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2721
2239
}
2722
2240
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("Failed to lower privileges permanently");
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
if(ret == -1){
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
if(ret == -1){
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
}
2252
}
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
if(ret == -1){
2255
perror_plus("close");
2256
}
2727
2257
}
2728
2258
}
2729
2730
free(interfaces_to_take_down);
2731
free(interfaces_hooks);
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2732
2265
2733
2266
/* Removes the GPGME temp directory and all files inside */
2734
if(tempdir != NULL){
2267
if(tempdir_created){
2735
2268
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
}
2269
struct dirent *direntry = NULL;
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
alphasort);
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
2274
direntry = direntries[i];
2275
char *fullname = NULL;
2276
ret = asprintf(&fullname, "%s/%s", tempdir,
2277
direntry->d_name);
2278
if(ret < 0){
2279
perror_plus("asprintf");
2280
continue;
2281
}
2282
ret = remove(fullname);
2283
if(ret == -1){
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2285
strerror(errno));
2286
}
2287
free(fullname);
2773
2288
}
2774
TEMP_FAILURE_RETRY(close(tempdir_fd));
2289
}
2290
2291
/* need to clean even if 0 because man page doesn't specify */
2292
free(direntries);
2293
if (numentries == -1){
2294
perror_plus("scandir");
2295
}
2296
ret = rmdir(tempdir);
2297
if(ret == -1 and errno != ENOENT){
2298
perror_plus("rmdir");
2775
2299
}
2776
2300
}
2777
2301
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0