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- Committer: Teddy Hogeborn
- Date: 2014-05-13 06:10:44 UTC
- Revision ID: teddy@recompile.se-20140513061044-6s03s1qzftpp4c1a
Tags: version-1.6.5-2
* debian/changelog (1.6.5-2): New entry.
- files added:
- debian/mandos-client.examples
- debian/upstream
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
91
97
92
98
#ifdef __linux__
93
99
#include <sys/klog.h> /* klogctl() */
135
141
static const char sys_class_net[] = "/sys/class/net";
136
142
char *connect_to = NULL;
137
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
138
146
139
147
/* Doubly linked list that need to be circularly linked when used */
140
148
typedef struct server{
141
149
const char *ip;
142
uint16_t port;
150
in_port_t port;
143
151
AvahiIfIndex if_index;
144
152
int af;
145
153
struct timespec last_seen;
149
157
150
158
/* Used for passing in values through the Avahi callback functions */
151
159
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
160
AvahiServer *server;
154
161
gnutls_certificate_credentials_t cred;
155
162
unsigned int dh_bits;
157
164
const char *priority;
158
165
gpgme_ctx_t ctx;
159
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
160
169
} mandos_context;
161
170
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
167
173
168
174
sig_atomic_t quit_now = 0;
169
175
int signal_received = 0;
170
176
171
177
/* Function to use when printing errors */
172
178
void perror_plus(const char *print_text){
179
int e = errno;
173
180
fprintf(stderr, "Mandos plugin %s: ",
174
181
program_invocation_short_name);
182
errno = e;
175
183
perror(print_text);
176
184
}
177
185
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
178
187
int fprintf_plus(FILE *stream, const char *format, ...){
179
188
va_list ap;
180
189
va_start (ap, format);
181
190
182
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
192
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
194
}
186
195
187
196
/*
189
198
* bytes. "buffer_capacity" is how much is currently allocated,
190
199
* "buffer_length" is how much is already used.
191
200
*/
201
__attribute__((nonnull, warn_unused_result))
192
202
size_t incbuffer(char **buffer, size_t buffer_length,
193
203
size_t buffer_capacity){
194
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
197
211
return 0;
198
212
}
213
*buffer = new_buf;
199
214
buffer_capacity += BUFFER_SIZE;
200
215
}
201
216
return buffer_capacity;
202
217
}
203
218
204
219
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
207
223
int ret;
208
224
server *new_server = malloc(sizeof(server));
209
225
if(new_server == NULL){
210
226
perror_plus("malloc");
211
return -1;
227
return false;
212
228
}
213
229
*new_server = (server){ .ip = strdup(ip),
214
230
.port = port,
216
232
.af = af };
217
233
if(new_server->ip == NULL){
218
234
perror_plus("strdup");
219
return -1;
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
220
241
}
221
242
/* Special case of first server */
222
if (mc.current_server == NULL){
243
if(*current_server == NULL){
223
244
new_server->next = new_server;
224
245
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
246
*current_server = new_server;
227
247
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
230
251
new_server->prev->next = new_server;
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;
252
(*current_server)->prev = new_server;
253
}
254
return true;
239
255
}
240
256
241
257
/*
242
258
* Initialize GPGME.
243
259
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
246
265
gpgme_error_t rc;
247
266
gpgme_engine_info_t engine_info;
248
267
249
250
268
/*
251
269
* Helper function to insert pub and seckey to the engine keyring.
252
270
*/
253
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
254
272
int ret;
255
273
int fd;
256
274
gpgme_data_t pgp_data;
268
286
return false;
269
287
}
270
288
271
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
272
290
if(rc != GPG_ERR_NO_ERROR){
273
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
292
gpgme_strsource(rc), gpgme_strerror(rc));
318
336
}
319
337
320
338
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
322
340
if(rc != GPG_ERR_NO_ERROR){
323
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
337
355
* Decrypt OpenPGP data.
338
356
* Returns -1 on error
339
357
*/
358
__attribute__((nonnull, warn_unused_result))
340
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
341
360
size_t crypto_size,
342
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
343
363
gpgme_data_t dh_crypto, dh_plain;
344
364
gpgme_error_t rc;
345
365
ssize_t ret;
371
391
372
392
/* Decrypt data from the cryptotext data buffer to the plaintext
373
393
data buffer */
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
395
if(rc != GPG_ERR_NO_ERROR){
376
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
397
gpgme_strsource(rc), gpgme_strerror(rc));
378
398
plaintext_length = -1;
379
399
if(debug){
380
400
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
382
402
if(result == NULL){
383
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
404
} else {
461
481
return plaintext_length;
462
482
}
463
483
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
467
487
if(ret == NULL)
468
488
ret = "(unknown)";
469
489
return ret;
470
490
}
471
491
472
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
473
494
static void debuggnutls(__attribute__((unused)) int level,
474
495
const char* string){
475
496
fprintf_plus(stderr, "GnuTLS: %s", string);
476
497
}
477
498
499
__attribute__((nonnull, warn_unused_result))
478
500
static int init_gnutls_global(const char *pubkeyfilename,
479
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
480
503
int ret;
481
504
482
505
if(debug){
499
522
}
500
523
501
524
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
526
if(ret != GNUTLS_E_SUCCESS){
504
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
528
safer_gnutls_strerror(ret));
515
538
}
516
539
517
540
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
519
542
GNUTLS_OPENPGP_FMT_BASE64);
520
543
if(ret != GNUTLS_E_SUCCESS){
521
544
fprintf_plus(stderr,
527
550
}
528
551
529
552
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
531
554
if(ret != GNUTLS_E_SUCCESS){
532
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
556
" initialization: %s\n",
534
557
safer_gnutls_strerror(ret));
535
558
goto globalfail;
536
559
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
561
if(ret != GNUTLS_E_SUCCESS){
539
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
563
safer_gnutls_strerror(ret));
541
564
goto globalfail;
542
565
}
543
566
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
568
546
569
return 0;
547
570
548
571
globalfail:
549
572
550
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
551
574
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
553
576
return -1;
554
577
}
555
578
556
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
557
582
int ret;
558
583
/* GnuTLS session creation */
559
584
do {
571
596
{
572
597
const char *err;
573
598
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
600
if(quit_now){
576
601
gnutls_deinit(*session);
577
602
return -1;
588
613
589
614
do {
590
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
616
mc->cred);
592
617
if(quit_now){
593
618
gnutls_deinit(*session);
594
619
return -1;
604
629
/* ignore client certificate if any. */
605
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
606
631
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
633
609
634
return 0;
610
635
}
614
639
__attribute__((unused)) const char *txt){}
615
640
616
641
/* Called when a Mandos server is found */
617
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
618
644
AvahiIfIndex if_index,
619
int af){
645
int af, mandos_context *mc){
620
646
int ret, tcp_sd = -1;
621
647
ssize_t sret;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
648
struct sockaddr_storage to;
626
649
char *buffer = NULL;
627
650
char *decrypted_buffer = NULL;
628
651
size_t buffer_length = 0;
652
675
return -1;
653
676
}
654
677
655
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
656
711
if(ret != 0){
657
712
return -1;
658
713
}
659
714
660
715
if(debug){
661
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
717
PRIuMAX "\n", ip, (uintmax_t)port);
663
718
}
664
719
665
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
677
732
678
733
memset(&to, 0, sizeof(to));
679
734
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
682
737
} else { /* IPv4 */
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
685
740
}
686
741
if(ret < 0 ){
687
742
int e = errno;
696
751
goto mandos_end;
697
752
}
698
753
if(af == AF_INET6){
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*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
757
if(if_index == AVAHI_IF_UNSPEC){
707
758
fprintf_plus(stderr, "An IPv6 link-local address is"
708
759
" incomplete without a network interface\n");
710
761
goto mandos_end;
711
762
}
712
763
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
714
765
}
715
766
} else {
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
768
}
720
769
721
770
if(quit_now){
729
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
779
perror_plus("if_indextoname");
731
780
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
734
783
}
735
784
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
738
787
}
739
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
742
790
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
745
795
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
748
800
}
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
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
755
807
}
756
808
}
757
809
761
813
}
762
814
763
815
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
765
818
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
767
821
}
768
822
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
824
int e = errno;
771
825
perror_plus("connect");
772
826
errno = e;
818
872
goto mandos_end;
819
873
}
820
874
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
823
880
824
881
if(quit_now){
825
882
errno = EINTR;
930
987
if(buffer_length > 0){
931
988
ssize_t decrypted_buffer_size;
932
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
933
&decrypted_buffer);
990
&decrypted_buffer, mc);
934
991
if(decrypted_buffer_size >= 0){
935
992
936
993
written = 0;
984
1041
return retval;
985
1042
}
986
1043
1044
__attribute__((nonnull))
987
1045
static void resolve_callback(AvahiSServiceResolver *r,
988
1046
AvahiIfIndex interface,
989
1047
AvahiProtocol proto,
997
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
1057
flags,
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
1002
1062
1003
1063
/* Called whenever a service has been resolved successfully or
1004
1064
timed out */
1013
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
1075
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1017
1078
break;
1018
1079
1019
1080
case AVAHI_RESOLVER_FOUND:
1025
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
1087
host_name, ip, (intmax_t)interface, port);
1027
1088
}
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1030
1093
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1032
1095
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
1035
1102
}
1036
1103
}
1037
1104
}
1047
1114
const char *domain,
1048
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1049
1116
flags,
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1052
1121
1053
1122
/* Called whenever a new services becomes available on the LAN or
1054
1123
is removed from the LAN */
1062
1131
case AVAHI_BROWSER_FAILURE:
1063
1132
1064
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1067
1137
return;
1068
1138
1069
1139
case AVAHI_BROWSER_NEW:
1072
1142
the callback function is called the Avahi server will free the
1073
1143
resolver for us. */
1074
1144
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1078
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
1150
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1081
1153
break;
1082
1154
1083
1155
case AVAHI_BROWSER_REMOVE:
1102
1174
signal_received = sig;
1103
1175
int old_errno = errno;
1104
1176
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1107
1179
}
1108
1180
errno = old_errno;
1109
1181
}
1110
1182
1183
__attribute__((nonnull, warn_unused_result))
1111
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
1185
int ret;
1186
error_t ret_errno;
1113
1187
1114
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
1189
if(s < 0){
1190
ret_errno = errno;
1116
1191
perror_plus("socket");
1192
errno = ret_errno;
1117
1193
return false;
1118
1194
}
1119
1195
strcpy(ifr->ifr_name, ifname);
1120
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
1197
if(ret == -1){
1122
1198
if(debug){
1199
ret_errno = errno;
1123
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1124
1202
}
1125
1203
return false;
1126
1204
}
1127
1205
return true;
1128
1206
}
1129
1207
1208
__attribute__((nonnull, warn_unused_result))
1130
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1210
1132
1211
/* Reject the loopback device */
1174
1253
* corresponds to an acceptable network device.
1175
1254
* (This function is passed to scandir(3) as a filter function.)
1176
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1177
1257
int good_interface(const struct dirent *if_entry){
1178
1258
if(if_entry->d_name[0] == '.'){
1179
1259
return 0;
1195
1275
}
1196
1276
1197
1277
/*
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
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1240
1312
int notdotentries(const struct dirent *direntry){
1241
1313
/* Skip "." and ".." */
1242
1314
if(direntry->d_name[0] == '.'
1249
1321
}
1250
1322
1251
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1252
1325
int runnable_hook(const struct dirent *direntry){
1253
1326
int ret;
1254
1327
size_t sret;
1309
1382
return 1;
1310
1383
}
1311
1384
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1313
1388
int ret;
1314
1389
struct timespec now;
1315
1390
struct timespec waited_time;
1316
1391
intmax_t block_time;
1317
1392
1318
1393
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1394
if(mc->current_server == NULL){
1395
if(debug){
1321
1396
fprintf_plus(stderr, "Wait until first server is found."
1322
1397
" No timeout!\n");
1323
1398
}
1324
1399
ret = avahi_simple_poll_iterate(s, -1);
1325
1400
} else {
1326
if (debug){
1401
if(debug){
1327
1402
fprintf_plus(stderr, "Check current_server if we should run"
1328
1403
" it, or wait\n");
1329
1404
}
1336
1411
/* Calculating in ms how long time between now and server
1337
1412
who we visted longest time ago. Now - last seen. */
1338
1413
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1414
- mc->current_server->last_seen.tv_sec);
1340
1415
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1416
- mc->current_server->last_seen.tv_nsec);
1342
1417
/* total time is 10s/10,000ms.
1343
1418
Converting to s from ms by dividing by 1,000,
1344
1419
and ns to ms by dividing by 1,000,000. */
1346
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1347
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1423
1349
if (debug){
1424
if(debug){
1350
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
1426
block_time);
1352
1427
}
1353
1428
1354
1429
if(block_time <= 0){
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);
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1359
1434
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1435
avahi_simple_poll_quit(s);
1361
1436
return 0;
1362
1437
}
1363
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1439
&mc->current_server->last_seen);
1365
1440
if(ret == -1){
1366
1441
perror_plus("clock_gettime");
1367
1442
return -1;
1368
1443
}
1369
mc.current_server = mc.current_server->next;
1444
mc->current_server = mc->current_server->next;
1370
1445
block_time = 0; /* Call avahi to find new Mandos
1371
1446
servers, but don't block */
1372
1447
}
1374
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
1450
}
1376
1451
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1452
if(ret > 0 or errno != EINTR){
1378
1453
return (ret != 1) ? ret : 0;
1379
1454
}
1380
1455
}
1381
1456
}
1382
1457
}
1383
1458
1384
bool run_network_hooks(const char *mode, const char *interface,
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1385
1517
const float delay){
1386
1518
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
1520
alphasort);
1391
1521
if(numhooks == -1){
1392
perror_plus("scandir");
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1393
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1394
1533
int devnull = open("/dev/null", O_RDONLY);
1395
1534
for(int i = 0; i < numhooks; i++){
1396
1535
direntry = direntries[i];
1408
1547
if(hook_pid == 0){
1409
1548
/* Child */
1410
1549
/* 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");
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1421
1553
}
1422
1554
/* Set group */
1423
1555
errno = 0;
1424
1556
ret = setgid(0);
1425
1557
if(ret == -1){
1426
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1427
1560
}
1428
1561
/* Reset supplementary groups */
1429
1562
errno = 0;
1430
1563
ret = setgroups(0, NULL);
1431
1564
if(ret == -1){
1432
1565
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);
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1439
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1440
1584
if(ret == -1){
1441
1585
perror_plus("setenv");
1446
1590
perror_plus("setenv");
1447
1591
_exit(EX_OSERR);
1448
1592
}
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1450
1594
if(ret == -1){
1451
1595
perror_plus("setenv");
1452
1596
_exit(EX_OSERR);
1457
1601
_exit(EX_OSERR);
1458
1602
}
1459
1603
char *delaystring;
1460
ret = asprintf(&delaystring, "%f", delay);
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1461
1605
if(ret == -1){
1462
1606
perror_plus("asprintf");
1463
1607
_exit(EX_OSERR);
1469
1613
_exit(EX_OSERR);
1470
1614
}
1471
1615
free(delaystring);
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
1474
1627
} else {
1475
1628
int status;
1476
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1507
1660
}
1508
1661
close(devnull);
1509
1662
}
1510
return true;
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
if(ret_errno != 0){
1719
perror_plus("Failed to raise privileges");
1720
}
1721
1722
#ifdef __linux__
1723
int ret_linux;
1724
bool restore_loglevel = false;
1725
if(ret_errno == 0){
1726
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1727
messages about the network interface to mess up the prompt */
1728
ret_linux = klogctl(8, NULL, 5);
1729
if(ret_linux == -1){
1730
perror_plus("klogctl");
1731
} else {
1732
restore_loglevel = true;
1733
}
1734
}
1735
#endif /* __linux__ */
1736
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
ioctl_errno = errno;
1738
#ifdef __linux__
1739
if(restore_loglevel){
1740
ret_linux = klogctl(7, NULL, 0);
1741
if(ret_linux == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
1747
/* If raise_privileges() succeeded above */
1748
if(ret_errno == 0){
1749
/* Lower privileges */
1750
ret_errno = lower_privileges();
1751
if(ret_errno != 0){
1752
errno = ret_errno;
1753
perror_plus("Failed to lower privileges");
1754
}
1755
}
1756
1757
/* Close the socket */
1758
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1759
if(ret == -1){
1760
perror_plus("close");
1761
}
1762
1763
if(ret_setflags == -1){
1764
errno = ioctl_errno;
1765
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1766
errno = old_errno;
1767
return ioctl_errno;
1768
}
1769
} else if(debug){
1770
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1771
interface);
1772
}
1773
1774
/* Sleep checking until interface is running.
1775
Check every 0.25s, up to total time of delay */
1776
for(int i=0; i < delay * 4; i++){
1777
if(interface_is_running(interface)){
1778
break;
1779
}
1780
struct timespec sleeptime = { .tv_nsec = 250000000 };
1781
ret = nanosleep(&sleeptime, NULL);
1782
if(ret == -1 and errno != EINTR){
1783
perror_plus("nanosleep");
1784
}
1785
}
1786
1787
errno = old_errno;
1788
return 0;
1789
}
1790
1791
__attribute__((nonnull, warn_unused_result))
1792
error_t take_down_interface(const char *const interface){
1793
error_t old_errno = errno;
1794
struct ifreq network;
1795
unsigned int if_index = if_nametoindex(interface);
1796
if(if_index == 0){
1797
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1798
errno = old_errno;
1799
return ENXIO;
1800
}
1801
if(interface_is_up(interface)){
1802
error_t ret_errno = 0, ioctl_errno = 0;
1803
if(not get_flags(interface, &network) and debug){
1804
ret_errno = errno;
1805
fprintf_plus(stderr, "Failed to get flags for interface "
1806
"\"%s\"\n", interface);
1807
errno = old_errno;
1808
return ret_errno;
1809
}
1810
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1811
1812
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1813
if(sd == -1){
1814
ret_errno = errno;
1815
perror_plus("socket");
1816
errno = old_errno;
1817
return ret_errno;
1818
}
1819
1820
if(debug){
1821
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1822
interface);
1823
}
1824
1825
/* Raise privileges */
1826
ret_errno = raise_privileges();
1827
if(ret_errno != 0){
1828
perror_plus("Failed to raise privileges");
1829
}
1830
1831
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1832
ioctl_errno = errno;
1833
1834
/* If raise_privileges() succeeded above */
1835
if(ret_errno == 0){
1836
/* Lower privileges */
1837
ret_errno = lower_privileges();
1838
if(ret_errno != 0){
1839
errno = ret_errno;
1840
perror_plus("Failed to lower privileges");
1841
}
1842
}
1843
1844
/* Close the socket */
1845
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
1850
if(ret_setflags == -1){
1851
errno = ioctl_errno;
1852
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1853
errno = old_errno;
1854
return ioctl_errno;
1855
}
1856
} else if(debug){
1857
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1858
interface);
1859
}
1860
1861
errno = old_errno;
1862
return 0;
1511
1863
}
1512
1864
1513
1865
int main(int argc, char *argv[]){
1866
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1867
.priority = "SECURE256:!CTYPE-X.509:"
1868
"+CTYPE-OPENPGP", .current_server = NULL,
1869
.interfaces = NULL, .interfaces_size = 0 };
1514
1870
AvahiSServiceBrowser *sb = NULL;
1515
int error;
1871
error_t ret_errno;
1516
1872
int ret;
1517
1873
intmax_t tmpmax;
1518
1874
char *tmp;
1519
1875
int exitcode = EXIT_SUCCESS;
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;
1876
char *interfaces_to_take_down = NULL;
1877
size_t interfaces_to_take_down_size = 0;
1878
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1879
char old_tempdir[] = "/tmp/mandosXXXXXX";
1880
char *tempdir = NULL;
1528
1881
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1529
1882
const char *seckey = PATHDIR "/" SECKEY;
1530
1883
const char *pubkey = PATHDIR "/" PUBKEY;
1884
char *interfaces_hooks = NULL;
1531
1885
1532
1886
bool gnutls_initialized = false;
1533
1887
bool gpgme_initialized = false;
1595
1949
.group = 2 },
1596
1950
{ .name = "retry", .key = 132,
1597
1951
.arg = "SECONDS",
1598
.doc = "Retry interval used when denied by the mandos server",
1952
.doc = "Retry interval used when denied by the Mandos server",
1599
1953
.group = 2 },
1600
1954
{ .name = "network-hook-dir", .key = 133,
1601
1955
.arg = "DIR",
1624
1978
connect_to = arg;
1625
1979
break;
1626
1980
case 'i': /* --interface */
1627
interface = arg;
1981
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1982
arg, (int)',');
1983
if(ret_errno != 0){
1984
argp_error(state, "%s", strerror(ret_errno));
1985
}
1628
1986
break;
1629
1987
case 's': /* --seckey */
1630
1988
seckey = arg;
1673
2031
argp_state_help(state, state->out_stream,
1674
2032
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1675
2033
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1678
2034
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1679
2035
exit(argp_err_exit_status);
1680
2036
break;
1709
2065
/* Work around Debian bug #633582:
1710
2066
<http://bugs.debian.org/633582> */
1711
2067
1712
/* Re-raise priviliges */
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
2068
/* Re-raise privileges */
2069
ret_errno = raise_privileges();
2070
if(ret_errno != 0){
2071
errno = ret_errno;
2072
perror_plus("Failed to raise privileges");
1717
2073
} else {
1718
2074
struct stat st;
1719
2075
1760
2116
}
1761
2117
1762
2118
/* Lower privileges */
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
2119
ret_errno = lower_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2122
perror_plus("Failed to lower privileges");
2123
}
2124
}
2125
}
2126
2127
/* Remove invalid interface names (except "none") */
2128
{
2129
char *interface = NULL;
2130
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2131
interface))){
2132
if(strcmp(interface, "none") != 0
2133
and if_nametoindex(interface) == 0){
2134
if(interface[0] != '\0'){
2135
fprintf_plus(stderr, "Not using nonexisting interface"
2136
" \"%s\"\n", interface);
2137
}
2138
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2139
interface = NULL;
1767
2140
}
1768
2141
}
1769
2142
}
1770
2143
1771
2144
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
2145
{
2146
if(mc.interfaces != NULL){
2147
interfaces_hooks = malloc(mc.interfaces_size);
2148
if(interfaces_hooks == NULL){
2149
perror_plus("malloc");
2150
goto end;
2151
}
2152
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2153
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2154
}
2155
run_network_hooks("start", interfaces_hooks != NULL ?
2156
interfaces_hooks : "", delay);
1774
2157
}
1775
2158
1776
2159
if(not debug){
1777
2160
avahi_set_log_function(empty_log);
1778
2161
}
1779
2162
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
1812
2163
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
2164
from the signal handler */
1814
2165
/* Initialize the pseudo-RNG for Avahi */
1815
2166
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
1818
2169
fprintf_plus(stderr,
1819
2170
"Avahi: Failed to create simple poll object.\n");
1820
2171
exitcode = EX_UNAVAILABLE;
1884
2235
}
1885
2236
}
1886
2237
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");
2238
/* If no interfaces were specified, make a list */
2239
if(mc.interfaces == NULL){
2240
struct dirent **direntries;
2241
/* Look for any good interfaces */
2242
ret = scandir(sys_class_net, &direntries, good_interface,
2243
alphasort);
2244
if(ret >= 1){
2245
/* Add all found interfaces to interfaces list */
2246
for(int i = 0; i < ret; ++i){
2247
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2248
direntries[i]->d_name);
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("argz_add");
2252
continue;
2253
}
2254
if(debug){
2255
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2256
direntries[i]->d_name);
2257
}
2258
}
2259
free(direntries);
2260
} else {
2261
free(direntries);
2262
fprintf_plus(stderr, "Could not find a network interface\n");
2263
exitcode = EXIT_FAILURE;
2264
goto end;
2265
}
2266
}
2267
2268
/* Bring up interfaces which are down, and remove any "none"s */
2269
{
2270
char *interface = NULL;
2271
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2272
interface))){
2273
/* If interface name is "none", stop bringing up interfaces.
2274
Also remove all instances of "none" from the list */
2275
if(strcmp(interface, "none") == 0){
2276
argz_delete(&mc.interfaces, &mc.interfaces_size,
2277
interface);
2278
interface = NULL;
2279
while((interface = argz_next(mc.interfaces,
2280
mc.interfaces_size, interface))){
2281
if(strcmp(interface, "none") == 0){
2282
argz_delete(&mc.interfaces, &mc.interfaces_size,
2283
interface);
2284
interface = NULL;
1972
2285
}
1973
2286
}
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){
1991
2287
break;
1992
2288
}
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
}
2289
bool interface_was_up = interface_is_up(interface);
2290
errno = bring_up_interface(interface, delay);
2291
if(not interface_was_up){
2292
if(errno != 0){
2293
perror_plus("Failed to bring up interface");
2294
} else {
2295
errno = argz_add(&interfaces_to_take_down,
2296
&interfaces_to_take_down_size,
2297
interface);
2298
if(errno != 0){
2299
perror_plus("argz_add");
2300
}
2301
}
2302
}
2303
}
2304
if(debug and (interfaces_to_take_down == NULL)){
2305
fprintf_plus(stderr, "No interfaces were brought up\n");
2306
}
2307
}
2308
2309
/* If we only got one interface, explicitly use only that one */
2310
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2311
if(debug){
2312
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2313
mc.interfaces);
2314
}
2315
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2022
2316
}
2023
2317
2024
2318
if(quit_now){
2025
2319
goto end;
2026
2320
}
2027
2321
2028
ret = init_gnutls_global(pubkey, seckey);
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
2029
2323
if(ret == -1){
2030
2324
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
2325
exitcode = EX_UNAVAILABLE;
2038
2332
goto end;
2039
2333
}
2040
2334
2041
if(mkdtemp(tempdir) == NULL){
2335
/* Try /run/tmp before /tmp */
2336
tempdir = mkdtemp(run_tempdir);
2337
if(tempdir == NULL and errno == ENOENT){
2338
if(debug){
2339
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2340
run_tempdir, old_tempdir);
2341
}
2342
tempdir = mkdtemp(old_tempdir);
2343
}
2344
if(tempdir == NULL){
2042
2345
perror_plus("mkdtemp");
2043
2346
goto end;
2044
2347
}
2045
tempdir_created = true;
2046
2348
2047
2349
if(quit_now){
2048
2350
goto end;
2049
2351
}
2050
2352
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2052
2354
fprintf_plus(stderr, "init_gpgme failed\n");
2053
2355
exitcode = EX_UNAVAILABLE;
2054
2356
goto end;
2064
2366
/* Connect directly, do not use Zeroconf */
2065
2367
/* (Mainly meant for debugging) */
2066
2368
char *address = strrchr(connect_to, ':');
2369
2067
2370
if(address == NULL){
2068
2371
fprintf_plus(stderr, "No colon in address\n");
2069
2372
exitcode = EX_USAGE;
2074
2377
goto end;
2075
2378
}
2076
2379
2077
uint16_t port;
2380
in_port_t port;
2078
2381
errno = 0;
2079
2382
tmpmax = strtoimax(address+1, &tmp, 10);
2080
2383
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2081
or tmpmax != (uint16_t)tmpmax){
2384
or tmpmax != (in_port_t)tmpmax){
2082
2385
fprintf_plus(stderr, "Bad port number\n");
2083
2386
exitcode = EX_USAGE;
2084
2387
goto end;
2085
2388
}
2086
2389
2087
2390
if(quit_now){
2088
2391
goto end;
2089
2392
}
2090
2393
2091
port = (uint16_t)tmpmax;
2394
port = (in_port_t)tmpmax;
2092
2395
*address = '\0';
2093
2396
/* Colon in address indicates IPv6 */
2094
2397
int af;
2110
2413
}
2111
2414
2112
2415
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2416
ret = start_mandos_communication(address, port, if_index, af,
2417
&mc);
2114
2418
if(quit_now or ret == 0){
2115
2419
break;
2116
2420
}
2118
2422
fprintf_plus(stderr, "Retrying in %d seconds\n",
2119
2423
(int)retry_interval);
2120
2424
}
2121
sleep((int)retry_interval);
2425
sleep((unsigned int)retry_interval);
2122
2426
}
2123
2427
2124
if (not quit_now){
2428
if(not quit_now){
2125
2429
exitcode = EXIT_SUCCESS;
2126
2430
}
2127
2431
2142
2446
config.publish_domain = 0;
2143
2447
2144
2448
/* Allocate a new server */
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
2148
2451
2149
2452
/* Free the Avahi configuration data */
2150
2453
avahi_server_config_free(&config);
2153
2456
/* Check if creating the Avahi server object succeeded */
2154
2457
if(mc.server == NULL){
2155
2458
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2156
avahi_strerror(error));
2459
avahi_strerror(ret_errno));
2157
2460
exitcode = EX_UNAVAILABLE;
2158
2461
goto end;
2159
2462
}
2165
2468
/* Create the Avahi service browser */
2166
2469
sb = avahi_s_service_browser_new(mc.server, if_index,
2167
2470
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2168
NULL, 0, browse_callback, NULL);
2471
NULL, 0, browse_callback,
2472
(void *)&mc);
2169
2473
if(sb == NULL){
2170
2474
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2171
2475
avahi_strerror(avahi_server_errno(mc.server)));
2183
2487
fprintf_plus(stderr, "Starting Avahi loop search\n");
2184
2488
}
2185
2489
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
2188
2492
if(debug){
2189
2493
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2190
2494
(ret == 0) ? "successfully" : "with error");
2197
2501
}
2198
2502
2199
2503
/* Cleanup things */
2504
free(mc.interfaces);
2505
2200
2506
if(sb != NULL)
2201
2507
avahi_s_service_browser_free(sb);
2202
2508
2203
2509
if(mc.server != NULL)
2204
2510
avahi_server_free(mc.server);
2205
2511
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
2208
2514
2209
2515
if(gnutls_initialized){
2210
2516
gnutls_certificate_free_credentials(mc.cred);
2227
2533
}
2228
2534
}
2229
2535
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2536
/* Re-raise privileges */
2234
2537
{
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2538
ret_errno = raise_privileges();
2539
if(ret_errno != 0){
2540
perror_plus("Failed to raise privileges");
2541
} else {
2542
2543
/* Run network hooks */
2544
run_network_hooks("stop", interfaces_hooks != NULL ?
2545
interfaces_hooks : "", delay);
2546
2547
/* Take down the network interfaces which were brought up */
2548
{
2549
char *interface = NULL;
2550
while((interface=argz_next(interfaces_to_take_down,
2551
interfaces_to_take_down_size,
2552
interface))){
2553
ret_errno = take_down_interface(interface);
2554
if(ret_errno != 0){
2555
errno = ret_errno;
2556
perror_plus("Failed to take down interface");
2557
}
2558
}
2559
if(debug and (interfaces_to_take_down == NULL)){
2560
fprintf_plus(stderr, "No interfaces needed to be taken"
2561
" down\n");
2562
}
2563
}
2239
2564
}
2240
2565
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
}
2566
ret_errno = lower_privileges_permanently();
2567
if(ret_errno != 0){
2568
perror_plus("Failed to lower privileges permanently");
2257
2569
}
2258
2570
}
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2571
2572
free(interfaces_to_take_down);
2573
free(interfaces_hooks);
2265
2574
2266
2575
/* Removes the GPGME temp directory and all files inside */
2267
if(tempdir_created){
2576
if(tempdir != NULL){
2268
2577
struct dirent **direntries = NULL;
2269
2578
struct dirent *direntry = NULL;
2270
2579
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
2580
alphasort);
2272
if (numentries > 0){
2581
if(numentries > 0){
2273
2582
for(int i = 0; i < numentries; i++){
2274
2583
direntry = direntries[i];
2275
2584
char *fullname = NULL;
2290
2599
2291
2600
/* need to clean even if 0 because man page doesn't specify */
2292
2601
free(direntries);
2293
if (numentries == -1){
2602
if(numentries == -1){
2294
2603
perror_plus("scandir");
2295
2604
}
2296
2605
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0