9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2019 Teddy Hogeborn
13
* Copyright © 2008-2019 Björn Påhlsson
15
* This file is part of Mandos.
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
* Contact the authors at <mandos@recompile.se>.
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
54
56
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open() */
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
72
program_invocation_short_name */
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
75
SIOCSIFFLAGS, if_indextoname(),
69
76
if_nametoindex(), IF_NAMESIZE */
120
145
#define PATHDIR "/conf/conf.d/mandos"
121
146
#define SECKEY "seckey.txt"
122
147
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
124
152
bool debug = false;
125
153
static const char mandos_protocol_version[] = "1";
126
154
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
155
const char *argp_program_bug_address = "<mandos@recompile.se>";
156
static const char sys_class_net[] = "/sys/class/net";
157
char *connect_to = NULL;
158
const char *hookdir = HOOKDIR;
163
/* Doubly linked list that need to be circularly linked when used */
164
typedef struct server{
167
AvahiIfIndex if_index;
169
struct timespec last_seen;
129
174
/* Used for passing in values through the Avahi callback functions */
131
AvahiSimplePoll *simple_poll;
132
176
AvahiServer *server;
133
177
gnutls_certificate_credentials_t cred;
134
178
unsigned int dh_bits;
135
179
gnutls_dh_params_t dh_params;
136
180
const char *priority;
182
server *current_server;
184
size_t interfaces_size;
138
185
} mandos_context;
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
190
sig_atomic_t quit_now = 0;
191
int signal_received = 0;
193
/* Function to use when printing errors */
194
void perror_plus(const char *print_text){
196
fprintf(stderr, "Mandos plugin %s: ",
197
program_invocation_short_name);
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
203
int fprintf_plus(FILE *stream, const char *format, ...){
205
va_start (ap, format);
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
208
program_invocation_short_name));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
146
213
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
214
* bytes. "buffer_capacity" is how much is currently allocated,
148
215
* "buffer_length" is how much is already used.
217
__attribute__((nonnull, warn_unused_result))
150
218
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
219
size_t buffer_capacity){
152
220
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
223
int old_errno = errno;
157
230
buffer_capacity += BUFFER_SIZE;
159
232
return buffer_capacity;
235
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
237
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
238
int af, server **current_server){
240
server *new_server = malloc(sizeof(server));
241
if(new_server == NULL){
242
perror_plus("malloc");
245
*new_server = (server){ .ip = strdup(ip),
247
.if_index = if_index,
249
if(new_server->ip == NULL){
250
perror_plus("strdup");
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
256
perror_plus("clock_gettime");
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
261
free((char *)(new_server->ip));
263
#pragma GCC diagnostic pop
268
/* Special case of first server */
269
if(*current_server == NULL){
270
new_server->next = new_server;
271
new_server->prev = new_server;
272
*current_server = new_server;
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
277
new_server->prev->next = new_server;
278
(*current_server)->prev = new_server;
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
288
if(seteuid(0) == -1){
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
316
if(seteuid(uid) == -1){
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
328
if(setuid(uid) == -1){
163
336
* Initialize GPGME.
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
338
__attribute__((nonnull, warn_unused_result))
339
static bool init_gpgme(const char * const seckey,
340
const char * const pubkey,
341
const char * const tempdir,
168
343
gpgme_error_t rc;
169
344
gpgme_engine_info_t engine_info;
173
347
* Helper function to insert pub and seckey to the engine keyring.
175
bool import_key(const char *filename){
349
bool import_key(const char * const filename){
177
352
gpgme_data_t pgp_data;
179
354
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
375
fprintf_plus(stderr, "System clock is January 1970");
379
fprintf_plus(stderr, "System clock is invalid");
384
ret = fstat(fd, &keystat);
386
perror_plus("fstat");
389
ret = raise_privileges();
392
perror_plus("Failed to raise privileges");
397
"Setting system clock to key file mtime");
399
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
403
ret = lower_privileges();
406
perror_plus("Failed to lower privileges");
185
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
411
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
192
rc = gpgme_op_import(mc.ctx, pgp_data);
417
rc = gpgme_op_import(mc->ctx, pgp_data);
193
418
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
419
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
420
gpgme_strsource(rc), gpgme_strerror(rc));
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
431
"The total number of considered keys: %d\n",
432
import_result->considered);
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
473
fprintf_plus(stderr, "Key status:\n");
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
501
perror_plus("close");
203
503
gpgme_data_release(pgp_data);
208
fprintf(stderr, "Initializing GPGME\n");
508
fprintf_plus(stderr, "Initializing GPGME\n");
212
512
gpgme_check_version(NULL);
213
513
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
514
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
515
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
516
gpgme_strsource(rc), gpgme_strerror(rc));
220
/* Set GPGME home directory for the OpenPGP engine only */
520
/* Set GPGME home directory for the OpenPGP engine only */
221
521
rc = gpgme_get_engine_info(&engine_info);
222
522
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
523
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
524
gpgme_strsource(rc), gpgme_strerror(rc));
227
527
while(engine_info != NULL){
266
569
ssize_t plaintext_length = 0;
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
572
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
272
575
/* Create new GPGME data buffer from memory cryptotext */
273
576
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
275
578
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
579
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
580
gpgme_strsource(rc), gpgme_strerror(rc));
281
584
/* Create new empty GPGME data buffer for the plaintext */
282
585
rc = gpgme_data_new(&dh_plain);
283
586
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
588
gpgme_strsource(rc), gpgme_strerror(rc));
286
589
gpgme_data_release(dh_crypto);
290
593
/* Decrypt data from the cryptotext data buffer to the plaintext
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
595
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
596
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
597
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
598
gpgme_strsource(rc), gpgme_strerror(rc));
296
599
plaintext_length = -1;
298
601
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
602
result = gpgme_op_decrypt_result(mc->ctx);
300
603
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
606
if(result->unsupported_algorithm != NULL) {
607
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
608
result->unsupported_algorithm);
610
fprintf_plus(stderr, "Wrong key usage: %s\n",
611
result->wrong_key_usage ? "Yes" : "No");
307
612
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
319
recipient = recipient->next;
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
621
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
418
723
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
724
ret = gnutls_certificate_allocate_credentials(&mc->cred);
420
725
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
safer_gnutls_strerror(ret));
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
738
#if GNUTLS_VERSION_NUMBER >= 0x030606
739
ret = gnutls_certificate_set_rawpk_key_file
740
(mc->cred, pubkeyfilename, seckeyfilename,
741
GNUTLS_X509_FMT_PEM, /* format */
744
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
746
0, /* names_length */
748
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
749
0); /* pkcs11_flags */
750
#elif GNUTLS_VERSION_NUMBER < 0x030600
436
751
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
752
(mc->cred, pubkeyfilename, seckeyfilename,
438
753
GNUTLS_OPENPGP_FMT_BASE64);
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
439
757
if(ret != GNUTLS_E_SUCCESS){
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
759
"Error[%d] while reading the key pair ('%s',"
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
safer_gnutls_strerror(ret));
448
766
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
767
ret = gnutls_dh_params_init(&mc->dh_params);
768
if(ret != GNUTLS_E_SUCCESS){
769
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
770
" initialization: %s\n",
771
safer_gnutls_strerror(ret));
774
/* If a Diffie-Hellman parameters file was given, try to use it */
775
if(dhparamsfilename != NULL){
776
gnutls_datum_t params = { .data = NULL, .size = 0 };
778
int dhpfile = open(dhparamsfilename, O_RDONLY);
781
dhparamsfilename = NULL;
784
size_t params_capacity = 0;
786
params_capacity = incbuffer((char **)¶ms.data,
788
(size_t)params_capacity);
789
if(params_capacity == 0){
790
perror_plus("incbuffer");
793
dhparamsfilename = NULL;
796
ssize_t bytes_read = read(dhpfile,
797
params.data + params.size,
803
/* check bytes_read for failure */
808
dhparamsfilename = NULL;
811
params.size += (unsigned int)bytes_read;
813
ret = close(dhpfile);
815
perror_plus("close");
817
if(params.data == NULL){
818
dhparamsfilename = NULL;
820
if(dhparamsfilename == NULL){
823
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
824
GNUTLS_X509_FMT_PEM);
825
if(ret != GNUTLS_E_SUCCESS){
826
fprintf_plus(stderr, "Failed to parse DH parameters in file"
827
" \"%s\": %s\n", dhparamsfilename,
828
safer_gnutls_strerror(ret));
829
dhparamsfilename = NULL;
834
if(dhparamsfilename == NULL){
835
if(mc->dh_bits == 0){
836
#if GNUTLS_VERSION_NUMBER < 0x030600
837
/* Find out the optimal number of DH bits */
838
/* Try to read the private key file */
839
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
841
int secfile = open(seckeyfilename, O_RDONLY);
846
size_t buffer_capacity = 0;
848
buffer_capacity = incbuffer((char **)&buffer.data,
850
(size_t)buffer_capacity);
851
if(buffer_capacity == 0){
852
perror_plus("incbuffer");
857
ssize_t bytes_read = read(secfile,
858
buffer.data + buffer.size,
864
/* check bytes_read for failure */
871
buffer.size += (unsigned int)bytes_read;
875
/* If successful, use buffer to parse private key */
876
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
877
if(buffer.data != NULL){
879
gnutls_openpgp_privkey_t privkey = NULL;
880
ret = gnutls_openpgp_privkey_init(&privkey);
881
if(ret != GNUTLS_E_SUCCESS){
882
fprintf_plus(stderr, "Error initializing OpenPGP key"
884
safer_gnutls_strerror(ret));
888
ret = gnutls_openpgp_privkey_import
889
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
890
if(ret != GNUTLS_E_SUCCESS){
891
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
892
safer_gnutls_strerror(ret));
898
/* Use private key to suggest an appropriate
900
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
901
gnutls_openpgp_privkey_deinit(privkey);
903
fprintf_plus(stderr, "This OpenPGP key implies using"
904
" a GnuTLS security parameter \"%s\".\n",
905
safe_string(gnutls_sec_param_get_name
911
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
912
/* Err on the side of caution */
913
sec_param = GNUTLS_SEC_PARAM_ULTRA;
915
fprintf_plus(stderr, "Falling back to security parameter"
917
safe_string(gnutls_sec_param_get_name
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
926
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
927
" implies %u DH bits; using that.\n",
928
safe_string(gnutls_sec_param_get_name
933
fprintf_plus(stderr, "Failed to get implied number of DH"
934
" bits for security parameter \"%s\"): %s\n",
935
safe_string(gnutls_sec_param_get_name
937
safer_gnutls_strerror(ret));
941
} else { /* dh_bits != 0 */
943
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
946
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
947
if(ret != GNUTLS_E_SUCCESS){
948
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
949
" bits): %s\n", mc->dh_bits,
950
safer_gnutls_strerror(ret));
953
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
gnutls_certificate_free_credentials(mc.cred);
469
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
961
gnutls_certificate_free_credentials(mc->cred);
962
gnutls_dh_params_deinit(mc->dh_params);
474
static int init_gnutls_session(gnutls_session_t *session){
966
__attribute__((nonnull, warn_unused_result))
967
static int init_gnutls_session(gnutls_session_t *session,
476
970
/* GnuTLS session creation */
477
ret = gnutls_init(session, GNUTLS_SERVER);
972
ret = gnutls_init(session, (GNUTLS_SERVER
973
#if GNUTLS_VERSION_NUMBER >= 0x030506
976
#if GNUTLS_VERSION_NUMBER >= 0x030606
977
| GNUTLS_ENABLE_RAWPK
983
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
984
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
986
"Error in GnuTLS session initialization: %s\n",
987
safer_gnutls_strerror(ret));
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
993
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
995
gnutls_deinit(*session);
998
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
999
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
1000
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1001
fprintf_plus(stderr, "GnuTLS error: %s\n",
1002
safer_gnutls_strerror(ret));
490
1003
gnutls_deinit(*session);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1009
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1012
gnutls_deinit(*session);
1015
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
1016
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
1017
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1018
safer_gnutls_strerror(ret));
500
1019
gnutls_deinit(*session);
504
1023
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
514
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
1031
__attribute__((unused)) const char *txt){}
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
1033
/* Helper function to add_local_route() and delete_local_route() */
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool add_delete_local_route(const bool add,
1036
const char *address,
1037
AvahiIfIndex if_index){
1039
char helper[] = "mandos-client-iprouteadddel";
1040
char add_arg[] = "add";
1041
char delete_arg[] = "delete";
1042
char debug_flag[] = "--debug";
1043
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1044
if(pluginhelperdir == NULL){
1046
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1047
" variable not set; cannot run helper\n");
1052
char interface[IF_NAMESIZE];
1053
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1054
perror_plus("if_indextoname");
1058
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1060
perror_plus("open(\"/dev/null\", O_RDONLY)");
1066
/* Raise privileges */
1067
errno = raise_privileges_permanently();
1069
perror_plus("Failed to raise privileges");
1070
/* _exit(EX_NOPERM); */
1076
perror_plus("setgid");
1080
/* Reset supplementary groups */
1082
ret = setgroups(0, NULL);
1084
perror_plus("setgroups");
1089
ret = dup2(devnull, STDIN_FILENO);
1091
perror_plus("dup2(devnull, STDIN_FILENO)");
1095
ret = close(devnull);
1097
perror_plus("close");
1099
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1101
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1104
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1109
if(helperdir_fd == -1){
1110
perror_plus("open");
1111
_exit(EX_UNAVAILABLE);
1113
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1115
if(helper_fd == -1){
1116
perror_plus("openat");
1117
close(helperdir_fd);
1118
_exit(EX_UNAVAILABLE);
1120
close(helperdir_fd);
1122
#pragma GCC diagnostic push
1123
#pragma GCC diagnostic ignored "-Wcast-qual"
1125
if(fexecve(helper_fd, (char *const [])
1126
{ helper, add ? add_arg : delete_arg, (char *)address,
1127
interface, debug ? debug_flag : NULL, NULL },
1130
#pragma GCC diagnostic pop
1132
perror_plus("fexecve");
1133
_exit(EXIT_FAILURE);
1137
perror_plus("fork");
1141
ret = close(devnull);
1143
perror_plus("close");
1149
pret = waitpid(pid, &status, 0);
1150
if(pret == -1 and errno == EINTR and quit_now){
1151
int errno_raising = 0;
1152
if((errno = raise_privileges()) != 0){
1153
errno_raising = errno;
1154
perror_plus("Failed to raise privileges in order to"
1155
" kill helper program");
1157
if(kill(pid, SIGTERM) == -1){
1158
perror_plus("kill");
1160
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1161
perror_plus("Failed to lower privileges after killing"
1166
} while(pret == -1 and errno == EINTR);
1168
perror_plus("waitpid");
1171
if(WIFEXITED(status)){
1172
if(WEXITSTATUS(status) != 0){
1173
fprintf_plus(stderr, "Error: iprouteadddel exited"
1174
" with status %d\n", WEXITSTATUS(status));
1179
if(WIFSIGNALED(status)){
1180
fprintf_plus(stderr, "Error: iprouteadddel died by"
1181
" signal %d\n", WTERMSIG(status));
1184
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1188
__attribute__((nonnull, warn_unused_result))
1189
static bool add_local_route(const char *address,
1190
AvahiIfIndex if_index){
1192
fprintf_plus(stderr, "Adding route to %s\n", address);
1194
return add_delete_local_route(true, address, if_index);
1197
__attribute__((nonnull, warn_unused_result))
1198
static bool delete_local_route(const char *address,
1199
AvahiIfIndex if_index){
1201
fprintf_plus(stderr, "Removing route to %s\n", address);
1203
return add_delete_local_route(false, address, if_index);
520
1206
/* Called when a Mandos server is found */
521
static int start_mandos_communication(const char *ip, uint16_t port,
1207
__attribute__((nonnull, warn_unused_result))
1208
static int start_mandos_communication(const char *ip, in_port_t port,
522
1209
AvahiIfIndex if_index,
1210
int af, mandos_context *mc){
524
1211
int ret, tcp_sd = -1;
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
1213
struct sockaddr_storage to;
530
1214
char *buffer = NULL;
531
char *decrypted_buffer;
1215
char *decrypted_buffer = NULL;
532
1216
size_t buffer_length = 0;
533
1217
size_t buffer_capacity = 0;
534
ssize_t decrypted_buffer_size;
537
1220
gnutls_session_t session;
538
1221
int pf; /* Protocol family */
1222
bool route_added = false;
552
fprintf(stderr, "Bad address family: %d\n", af);
1239
fprintf_plus(stderr, "Bad address family: %d\n", af);
556
ret = init_gnutls_session(&session);
1244
/* If the interface is specified and we have a list of interfaces */
1245
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1246
/* Check if the interface is one of the interfaces we are using */
1249
char *interface = NULL;
1250
while((interface = argz_next(mc->interfaces,
1251
mc->interfaces_size,
1253
if(if_nametoindex(interface) == (unsigned int)if_index){
1260
/* This interface does not match any in the list, so we don't
1261
connect to the server */
1263
char interface[IF_NAMESIZE];
1264
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1265
perror_plus("if_indextoname");
1267
fprintf_plus(stderr, "Skipping server on non-used interface"
1269
if_indextoname((unsigned int)if_index,
1277
ret = init_gnutls_session(&session, mc);
562
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
1283
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1284
PRIuMAX "\n", ip, (uintmax_t)port);
566
tcp_sd = socket(pf, SOCK_STREAM, 0);
1287
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1290
perror_plus("socket");
570
1292
goto mandos_end;
574
1297
goto mandos_end;
577
memset(&to, 0, sizeof(to));
578
1300
if(af == AF_INET6){
579
to.in6.sin6_family = (sa_family_t)af;
580
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1301
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1302
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1303
ret = inet_pton(af, ip, &to6->sin6_addr);
581
1304
} else { /* IPv4 */
582
to.in.sin_family = (sa_family_t)af;
583
ret = inet_pton(af, ip, &to.in.sin_addr);
1305
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1306
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1307
ret = inet_pton(af, ip, &to4->sin_addr);
1311
perror_plus("inet_pton");
588
1313
goto mandos_end;
591
fprintf(stderr, "Bad address: %s\n", ip);
1317
fprintf_plus(stderr, "Bad address: %s\n", ip);
593
1319
goto mandos_end;
595
1321
if(af == AF_INET6){
596
to.in6.sin6_port = htons(port); /* Spurious warnings from
598
-Wunreachable-code */
600
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
601
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
1322
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1323
if(IN6_IS_ADDR_LINKLOCAL
1324
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
603
1325
if(if_index == AVAHI_IF_UNSPEC){
604
fprintf(stderr, "An IPv6 link-local address is incomplete"
605
" without a network interface\n");
1326
fprintf_plus(stderr, "An IPv6 link-local address is"
1327
" incomplete without a network interface\n");
607
1329
goto mandos_end;
609
1331
/* Set the network interface number as scope */
610
to.in6.sin6_scope_id = (uint32_t)if_index;
1332
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
613
to.in.sin_port = htons(port); /* Spurious warnings from
615
-Wunreachable-code */
1335
((struct sockaddr_in *)&to)->sin_port = htons(port);
619
1340
goto mandos_end;
623
1344
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
624
1345
char interface[IF_NAMESIZE];
625
1346
if(if_indextoname((unsigned int)if_index, interface) == NULL){
626
perror("if_indextoname");
1347
perror_plus("if_indextoname");
628
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
629
ip, interface, port);
1349
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1350
"\n", ip, interface, (uintmax_t)port);
632
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1353
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1354
ip, (uintmax_t)port);
635
1356
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
636
1357
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
639
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
642
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
648
if(strcmp(addrstr, ip) != 0){
649
fprintf(stderr, "Canonical address form: %s\n", addrstr);
659
ret = connect(tcp_sd, &to.in6, sizeof(to));
661
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
1359
ret = getnameinfo((struct sockaddr *)&to,
1360
sizeof(struct sockaddr_in6),
1361
addrstr, sizeof(addrstr), NULL, 0,
1364
ret = getnameinfo((struct sockaddr *)&to,
1365
sizeof(struct sockaddr_in),
1366
addrstr, sizeof(addrstr), NULL, 0,
1369
if(ret == EAI_SYSTEM){
1370
perror_plus("getnameinfo");
1371
} else if(ret != 0) {
1372
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1373
} else if(strcmp(addrstr, ip) != 0){
1374
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1385
ret = connect(tcp_sd, (struct sockaddr *)&to,
1386
sizeof(struct sockaddr_in6));
1388
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1389
sizeof(struct sockaddr_in));
1392
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1393
and if_index != AVAHI_IF_UNSPEC
1394
and connect_to == NULL
1395
and not route_added and
1396
((af == AF_INET6 and not
1397
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1399
or (af == AF_INET and
1400
/* Not a a IPv4LL address */
1401
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1402
& 0xFFFF0000L) != 0xA9FE0000L))){
1403
/* Work around Avahi bug - Avahi does not announce link-local
1404
addresses if it has a global address, so local hosts with
1405
*only* a link-local address (e.g. Mandos clients) cannot
1406
connect to a Mandos server announced by Avahi on a server
1407
host with a global address. Work around this by retrying
1408
with an explicit route added with the server's address.
1410
Avahi bug reference:
1411
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1412
https://bugs.debian.org/587961
1415
fprintf_plus(stderr, "Mandos server unreachable, trying"
1419
route_added = add_local_route(ip, if_index);
1425
if(errno != ECONNREFUSED or debug){
1427
perror_plus("connect");
673
1440
const char *out = mandos_protocol_version;
965
1795
signal_received = sig;
966
1796
int old_errno = errno;
967
if(mc.simple_poll != NULL){
968
avahi_simple_poll_quit(mc.simple_poll);
1797
/* set main loop to exit */
1798
if(simple_poll != NULL){
1799
avahi_simple_poll_quit(simple_poll);
1804
__attribute__((nonnull, warn_unused_result))
1805
bool get_flags(const char *ifname, struct ifreq *ifr){
1809
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1812
perror_plus("socket");
1816
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1817
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1818
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1822
perror_plus("ioctl SIOCGIFFLAGS");
1825
if((close(s) == -1) and debug){
1827
perror_plus("close");
1832
if((close(s) == -1) and debug){
1834
perror_plus("close");
1840
__attribute__((nonnull, warn_unused_result))
1841
bool good_flags(const char *ifname, const struct ifreq *ifr){
1843
/* Reject the loopback device */
1844
if(ifr->ifr_flags & IFF_LOOPBACK){
1846
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1851
/* Accept point-to-point devices only if connect_to is specified */
1852
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1854
fprintf_plus(stderr, "Accepting point-to-point interface"
1855
" \"%s\"\n", ifname);
1859
/* Otherwise, reject non-broadcast-capable devices */
1860
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1862
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1863
" \"%s\"\n", ifname);
1867
/* Reject non-ARP interfaces (including dummy interfaces) */
1868
if(ifr->ifr_flags & IFF_NOARP){
1870
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1876
/* Accept this device */
1878
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1884
* This function determines if a directory entry in /sys/class/net
1885
* corresponds to an acceptable network device.
1886
* (This function is passed to scandir(3) as a filter function.)
1888
__attribute__((nonnull, warn_unused_result))
1889
int good_interface(const struct dirent *if_entry){
1890
if(if_entry->d_name[0] == '.'){
1895
if(not get_flags(if_entry->d_name, &ifr)){
1897
fprintf_plus(stderr, "Failed to get flags for interface "
1898
"\"%s\"\n", if_entry->d_name);
1903
if(not good_flags(if_entry->d_name, &ifr)){
1910
* This function determines if a network interface is up.
1912
__attribute__((nonnull, warn_unused_result))
1913
bool interface_is_up(const char *interface){
1915
if(not get_flags(interface, &ifr)){
1917
fprintf_plus(stderr, "Failed to get flags for interface "
1918
"\"%s\"\n", interface);
1923
return (bool)(ifr.ifr_flags & IFF_UP);
1927
* This function determines if a network interface is running
1929
__attribute__((nonnull, warn_unused_result))
1930
bool interface_is_running(const char *interface){
1932
if(not get_flags(interface, &ifr)){
1934
fprintf_plus(stderr, "Failed to get flags for interface "
1935
"\"%s\"\n", interface);
1940
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1943
__attribute__((nonnull, pure, warn_unused_result))
1944
int notdotentries(const struct dirent *direntry){
1945
/* Skip "." and ".." */
1946
if(direntry->d_name[0] == '.'
1947
and (direntry->d_name[1] == '\0'
1948
or (direntry->d_name[1] == '.'
1949
and direntry->d_name[2] == '\0'))){
1955
/* Is this directory entry a runnable program? */
1956
__attribute__((nonnull, warn_unused_result))
1957
int runnable_hook(const struct dirent *direntry){
1962
if((direntry->d_name)[0] == '\0'){
1967
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1968
"abcdefghijklmnopqrstuvwxyz"
1971
if((direntry->d_name)[sret] != '\0'){
1972
/* Contains non-allowed characters */
1974
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1980
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1983
perror_plus("Could not stat hook");
1987
if(not (S_ISREG(st.st_mode))){
1988
/* Not a regular file */
1990
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1995
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1996
/* Not executable */
1998
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
2004
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
2010
__attribute__((nonnull, warn_unused_result))
2011
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2012
mandos_context *mc){
2014
struct timespec now;
2015
struct timespec waited_time;
2016
intmax_t block_time;
2019
if(mc->current_server == NULL){
2021
fprintf_plus(stderr, "Wait until first server is found."
2024
ret = avahi_simple_poll_iterate(s, -1);
2027
fprintf_plus(stderr, "Check current_server if we should run"
2030
/* the current time */
2031
ret = clock_gettime(CLOCK_MONOTONIC, &now);
2033
perror_plus("clock_gettime");
2036
/* Calculating in ms how long time between now and server
2037
who we visted longest time ago. Now - last seen. */
2038
waited_time.tv_sec = (now.tv_sec
2039
- mc->current_server->last_seen.tv_sec);
2040
waited_time.tv_nsec = (now.tv_nsec
2041
- mc->current_server->last_seen.tv_nsec);
2042
/* total time is 10s/10,000ms.
2043
Converting to s from ms by dividing by 1,000,
2044
and ns to ms by dividing by 1,000,000. */
2045
block_time = ((retry_interval
2046
- ((intmax_t)waited_time.tv_sec * 1000))
2047
- ((intmax_t)waited_time.tv_nsec / 1000000));
2050
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2054
if(block_time <= 0){
2055
ret = start_mandos_communication(mc->current_server->ip,
2056
mc->current_server->port,
2057
mc->current_server->if_index,
2058
mc->current_server->af, mc);
2060
avahi_simple_poll_quit(s);
2063
ret = clock_gettime(CLOCK_MONOTONIC,
2064
&mc->current_server->last_seen);
2066
perror_plus("clock_gettime");
2069
mc->current_server = mc->current_server->next;
2070
block_time = 0; /* Call avahi to find new Mandos
2071
servers, but don't block */
2074
ret = avahi_simple_poll_iterate(s, (int)block_time);
2077
if(ret > 0 or errno != EINTR){
2078
return (ret != 1) ? ret : 0;
2084
__attribute__((nonnull))
2085
void run_network_hooks(const char *mode, const char *interface,
2087
struct dirent **direntries = NULL;
2088
if(hookdir_fd == -1){
2089
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2091
if(hookdir_fd == -1){
2092
if(errno == ENOENT){
2094
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2095
" found\n", hookdir);
2098
perror_plus("open");
2103
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2105
perror_plus("open(\"/dev/null\", O_RDONLY)");
2108
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2109
runnable_hook, alphasort);
2111
perror_plus("scandir");
2115
struct dirent *direntry;
2117
for(int i = 0; i < numhooks; i++){
2118
direntry = direntries[i];
2120
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2123
pid_t hook_pid = fork();
2126
/* Raise privileges */
2127
errno = raise_privileges_permanently();
2129
perror_plus("Failed to raise privileges");
2136
perror_plus("setgid");
2139
/* Reset supplementary groups */
2141
ret = setgroups(0, NULL);
2143
perror_plus("setgroups");
2146
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2148
perror_plus("setenv");
2151
ret = setenv("DEVICE", interface, 1);
2153
perror_plus("setenv");
2156
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2158
perror_plus("setenv");
2161
ret = setenv("MODE", mode, 1);
2163
perror_plus("setenv");
2167
ret = asprintf(&delaystring, "%f", (double)delay);
2169
perror_plus("asprintf");
2172
ret = setenv("DELAY", delaystring, 1);
2175
perror_plus("setenv");
2179
if(connect_to != NULL){
2180
ret = setenv("CONNECT", connect_to, 1);
2182
perror_plus("setenv");
2186
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2190
perror_plus("openat");
2191
_exit(EXIT_FAILURE);
2193
if(close(hookdir_fd) == -1){
2194
perror_plus("close");
2195
_exit(EXIT_FAILURE);
2197
ret = dup2(devnull, STDIN_FILENO);
2199
perror_plus("dup2(devnull, STDIN_FILENO)");
2202
ret = close(devnull);
2204
perror_plus("close");
2207
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2209
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2212
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2214
perror_plus("fexecve");
2215
_exit(EXIT_FAILURE);
2219
perror_plus("fork");
2224
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2225
perror_plus("waitpid");
2229
if(WIFEXITED(status)){
2230
if(WEXITSTATUS(status) != 0){
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2232
" with status %d\n", direntry->d_name,
2233
WEXITSTATUS(status));
2237
} else if(WIFSIGNALED(status)){
2238
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2239
" signal %d\n", direntry->d_name,
2244
fprintf_plus(stderr, "Warning: network hook \"%s\""
2245
" crashed\n", direntry->d_name);
2251
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2257
if(close(hookdir_fd) == -1){
2258
perror_plus("close");
2265
__attribute__((nonnull, warn_unused_result))
2266
int bring_up_interface(const char *const interface,
2268
int old_errno = errno;
2270
struct ifreq network;
2271
unsigned int if_index = if_nametoindex(interface);
2273
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2283
if(not interface_is_up(interface)){
2285
int ioctl_errno = 0;
2286
if(not get_flags(interface, &network)){
2288
fprintf_plus(stderr, "Failed to get flags for interface "
2289
"\"%s\"\n", interface);
2293
network.ifr_flags |= IFF_UP; /* set flag */
2295
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2298
perror_plus("socket");
2306
perror_plus("close");
2313
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2317
/* Raise privileges */
2318
ret_errno = raise_privileges();
2321
perror_plus("Failed to raise privileges");
2326
bool restore_loglevel = false;
2328
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2329
messages about the network interface to mess up the prompt */
2330
ret_linux = klogctl(8, NULL, 5);
2331
if(ret_linux == -1){
2332
perror_plus("klogctl");
2334
restore_loglevel = true;
2337
#endif /* __linux__ */
2338
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2339
ioctl_errno = errno;
2341
if(restore_loglevel){
2342
ret_linux = klogctl(7, NULL, 0);
2343
if(ret_linux == -1){
2344
perror_plus("klogctl");
2347
#endif /* __linux__ */
2349
/* If raise_privileges() succeeded above */
2351
/* Lower privileges */
2352
ret_errno = lower_privileges();
2355
perror_plus("Failed to lower privileges");
2359
/* Close the socket */
2362
perror_plus("close");
2365
if(ret_setflags == -1){
2366
errno = ioctl_errno;
2367
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2372
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2376
/* Sleep checking until interface is running.
2377
Check every 0.25s, up to total time of delay */
2378
for(int i = 0; i < delay * 4; i++){
2379
if(interface_is_running(interface)){
2382
struct timespec sleeptime = { .tv_nsec = 250000000 };
2383
ret = nanosleep(&sleeptime, NULL);
2384
if(ret == -1 and errno != EINTR){
2385
perror_plus("nanosleep");
2393
__attribute__((nonnull, warn_unused_result))
2394
int take_down_interface(const char *const interface){
2395
int old_errno = errno;
2396
struct ifreq network;
2397
unsigned int if_index = if_nametoindex(interface);
2399
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2403
if(interface_is_up(interface)){
2405
int ioctl_errno = 0;
2406
if(not get_flags(interface, &network) and debug){
2408
fprintf_plus(stderr, "Failed to get flags for interface "
2409
"\"%s\"\n", interface);
2413
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2415
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2418
perror_plus("socket");
2424
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2428
/* Raise privileges */
2429
ret_errno = raise_privileges();
2432
perror_plus("Failed to raise privileges");
2435
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2436
ioctl_errno = errno;
2438
/* If raise_privileges() succeeded above */
2440
/* Lower privileges */
2441
ret_errno = lower_privileges();
2444
perror_plus("Failed to lower privileges");
2448
/* Close the socket */
2449
int ret = close(sd);
2451
perror_plus("close");
2454
if(ret_setflags == -1){
2455
errno = ioctl_errno;
2456
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2461
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
973
2469
int main(int argc, char *argv[]){
2470
mandos_context mc = { .server = NULL, .dh_bits = 0,
2471
#if GNUTLS_VERSION_NUMBER >= 0x030606
2472
.priority = "SECURE128:!CTYPE-X.509"
2473
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2475
#elif GNUTLS_VERSION_NUMBER < 0x030600
2476
.priority = "SECURE256:!CTYPE-X.509"
2477
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2479
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2481
.current_server = NULL, .interfaces = NULL,
2482
.interfaces_size = 0 };
974
2483
AvahiSServiceBrowser *sb = NULL;
977
2486
intmax_t tmpmax;
979
2488
int exitcode = EXIT_SUCCESS;
980
const char *interface = "eth0";
981
struct ifreq network;
983
bool take_down_interface = false;
986
char *connect_to = NULL;
987
char tempdir[] = "/tmp/mandosXXXXXX";
988
bool tempdir_created = false;
2489
char *interfaces_to_take_down = NULL;
2490
size_t interfaces_to_take_down_size = 0;
2491
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2492
char old_tempdir[] = "/tmp/mandosXXXXXX";
2493
char *tempdir = NULL;
989
2494
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
990
2495
const char *seckey = PATHDIR "/" SECKEY;
991
2496
const char *pubkey = PATHDIR "/" PUBKEY;
2497
#if GNUTLS_VERSION_NUMBER >= 0x030606
2498
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2499
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2501
const char *dh_params_file = NULL;
2502
char *interfaces_hooks = NULL;
993
2504
bool gnutls_initialized = false;
994
2505
bool gpgme_initialized = false;
995
2506
float delay = 2.5f;
2507
double retry_interval = 10; /* 10s between trying a server and
2508
retrying the same server again */
997
struct sigaction old_sigterm_action;
2510
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
998
2511
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2516
/* Lower any group privileges we might have, just to be safe */
2520
perror_plus("setgid");
2523
/* Lower user privileges (temporarily) */
2527
perror_plus("seteuid");
1001
2535
struct argp_option options[] = {
1002
2536
{ .name = "debug", .key = 128,
1070
2659
delay = strtof(arg, &tmp);
1071
2660
if(errno != 0 or tmp == arg or *tmp != '\0'){
1072
fprintf(stderr, "Bad delay\n");
2661
argp_error(state, "Bad delay");
2663
case 132: /* --retry */
2665
retry_interval = strtod(arg, &tmp);
2666
if(errno != 0 or tmp == arg or *tmp != '\0'
2667
or (retry_interval * 1000) > INT_MAX
2668
or retry_interval < 0){
2669
argp_error(state, "Bad retry interval");
2672
case 133: /* --network-hook-dir */
2676
* These reproduce what we would get without ARGP_NO_HELP
2678
case '?': /* --help */
2679
argp_state_help(state, state->out_stream,
2680
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2681
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2682
__builtin_unreachable();
2683
case -3: /* --usage */
2684
argp_state_help(state, state->out_stream,
2685
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2686
__builtin_unreachable();
2687
case 'V': /* --version */
2688
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2689
exit(argp_err_exit_status);
1081
2692
return ARGP_ERR_UNKNOWN;
1086
2697
struct argp argp = { .options = options, .parser = parse_opt,
1087
2698
.args_doc = "",
1088
2699
.doc = "Mandos client -- Get and decrypt"
1089
2700
" passwords from a Mandos server" };
1090
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1091
if(ret == ARGP_ERR_UNKNOWN){
1092
fprintf(stderr, "Unknown error while parsing arguments\n");
1093
exitcode = EXIT_FAILURE;
2701
ret_errno = argp_parse(&argp, argc, argv,
2702
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2709
perror_plus("argp_parse");
2710
exitcode = EX_OSERR;
2713
exitcode = EX_USAGE;
2719
/* Work around Debian bug #633582:
2720
<https://bugs.debian.org/633582> */
2722
/* Re-raise privileges */
2723
ret = raise_privileges();
2726
perror_plus("Failed to raise privileges");
2730
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2731
int seckey_fd = open(seckey, O_RDONLY);
2732
if(seckey_fd == -1){
2733
perror_plus("open");
2735
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2737
perror_plus("fstat");
2739
if(S_ISREG(st.st_mode)
2740
and st.st_uid == 0 and st.st_gid == 0){
2741
ret = fchown(seckey_fd, uid, gid);
2743
perror_plus("fchown");
2751
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2752
int pubkey_fd = open(pubkey, O_RDONLY);
2753
if(pubkey_fd == -1){
2754
perror_plus("open");
2756
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2758
perror_plus("fstat");
2760
if(S_ISREG(st.st_mode)
2761
and st.st_uid == 0 and st.st_gid == 0){
2762
ret = fchown(pubkey_fd, uid, gid);
2764
perror_plus("fchown");
2772
if(dh_params_file != NULL
2773
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2774
int dhparams_fd = open(dh_params_file, O_RDONLY);
2775
if(dhparams_fd == -1){
2776
perror_plus("open");
2778
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2780
perror_plus("fstat");
2782
if(S_ISREG(st.st_mode)
2783
and st.st_uid == 0 and st.st_gid == 0){
2784
ret = fchown(dhparams_fd, uid, gid);
2786
perror_plus("fchown");
2794
/* Lower privileges */
2795
ret = lower_privileges();
2798
perror_plus("Failed to lower privileges");
2803
/* Remove invalid interface names (except "none") */
2805
char *interface = NULL;
2806
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2808
if(strcmp(interface, "none") != 0
2809
and if_nametoindex(interface) == 0){
2810
if(interface[0] != '\0'){
2811
fprintf_plus(stderr, "Not using nonexisting interface"
2812
" \"%s\"\n", interface);
2814
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2820
/* Run network hooks */
2822
if(mc.interfaces != NULL){
2823
interfaces_hooks = malloc(mc.interfaces_size);
2824
if(interfaces_hooks == NULL){
2825
perror_plus("malloc");
2828
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2829
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2831
run_network_hooks("start", interfaces_hooks != NULL ?
2832
interfaces_hooks : "", delay);
1136
2874
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
perror("sigaction");
1139
return EXIT_FAILURE;
2876
perror_plus("sigaction");
1141
2879
if(old_sigterm_action.sa_handler != SIG_IGN){
1142
2880
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
perror("sigaction");
1145
exitcode = EXIT_FAILURE;
2882
perror_plus("sigaction");
2883
exitcode = EX_OSERR;
1149
2887
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
perror("sigaction");
1152
return EXIT_FAILURE;
2889
perror_plus("sigaction");
1154
2892
if(old_sigterm_action.sa_handler != SIG_IGN){
1155
2893
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
perror("sigaction");
1158
exitcode = EXIT_FAILURE;
2895
perror_plus("sigaction");
2896
exitcode = EX_OSERR;
1162
2900
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
perror("sigaction");
1165
return EXIT_FAILURE;
2902
perror_plus("sigaction");
1167
2905
if(old_sigterm_action.sa_handler != SIG_IGN){
1168
2906
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
perror("sigaction");
1171
exitcode = EXIT_FAILURE;
1176
/* If the interface is down, bring it up */
1177
if(interface[0] != '\0'){
1178
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1181
exitcode = EXIT_FAILURE;
1190
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1191
messages to mess up the prompt */
1192
ret = klogctl(8, NULL, 5);
1193
bool restore_loglevel = true;
1195
restore_loglevel = false;
1198
#endif /* __linux__ */
1200
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1203
exitcode = EXIT_FAILURE;
1205
if(restore_loglevel){
1206
ret = klogctl(7, NULL, 0);
1211
#endif /* __linux__ */
1214
strcpy(network.ifr_name, interface);
1215
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
perror("ioctl SIOCGIFFLAGS");
1219
if(restore_loglevel){
1220
ret = klogctl(7, NULL, 0);
1225
#endif /* __linux__ */
1226
exitcode = EXIT_FAILURE;
1229
if((network.ifr_flags & IFF_UP) == 0){
1230
network.ifr_flags |= IFF_UP;
1231
take_down_interface = true;
1232
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
take_down_interface = false;
1235
perror("ioctl SIOCSIFFLAGS");
1236
exitcode = EXIT_FAILURE;
1238
if(restore_loglevel){
1239
ret = klogctl(7, NULL, 0);
2908
perror_plus("sigaction");
2909
exitcode = EX_OSERR;
2914
/* If no interfaces were specified, make a list */
2915
if(mc.interfaces == NULL){
2916
struct dirent **direntries = NULL;
2917
/* Look for any good interfaces */
2918
ret = scandir(sys_class_net, &direntries, good_interface,
2921
/* Add all found interfaces to interfaces list */
2922
for(int i = 0; i < ret; ++i){
2923
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2924
direntries[i]->d_name);
2927
perror_plus("argz_add");
2928
free(direntries[i]);
2932
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2933
direntries[i]->d_name);
2935
free(direntries[i]);
2942
fprintf_plus(stderr, "Could not find a network interface\n");
2943
exitcode = EXIT_FAILURE;
2948
/* Bring up interfaces which are down, and remove any "none"s */
2950
char *interface = NULL;
2951
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2953
/* If interface name is "none", stop bringing up interfaces.
2954
Also remove all instances of "none" from the list */
2955
if(strcmp(interface, "none") == 0){
2956
argz_delete(&mc.interfaces, &mc.interfaces_size,
2959
while((interface = argz_next(mc.interfaces,
2960
mc.interfaces_size, interface))){
2961
if(strcmp(interface, "none") == 0){
2962
argz_delete(&mc.interfaces, &mc.interfaces_size,
1244
#endif /* __linux__ */
1248
/* sleep checking until interface is running */
1249
for(int i=0; i < delay * 4; i++){
1250
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
perror("ioctl SIOCGIFFLAGS");
1253
} else if(network.ifr_flags & IFF_RUNNING){
1256
struct timespec sleeptime = { .tv_nsec = 250000000 };
1257
ret = nanosleep(&sleeptime, NULL);
1258
if(ret == -1 and errno != EINTR){
1259
perror("nanosleep");
1262
if(not take_down_interface){
1263
/* We won't need the socket anymore */
1264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1270
if(restore_loglevel){
1271
/* Restores kernel loglevel to default */
1272
ret = klogctl(7, NULL, 0);
1277
#endif /* __linux__ */
1302
ret = init_gnutls_global(pubkey, seckey);
1304
fprintf(stderr, "init_gnutls_global failed\n");
1305
exitcode = EXIT_FAILURE;
2969
bool interface_was_up = interface_is_up(interface);
2970
errno = bring_up_interface(interface, delay);
2971
if(not interface_was_up){
2973
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2974
" %s\n", interface, strerror(errno));
2976
errno = argz_add(&interfaces_to_take_down,
2977
&interfaces_to_take_down_size,
2980
perror_plus("argz_add");
2985
if(debug and (interfaces_to_take_down == NULL)){
2986
fprintf_plus(stderr, "No interfaces were brought up\n");
2990
/* If we only got one interface, explicitly use only that one */
2991
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2993
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2996
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
3003
#if GNUTLS_VERSION_NUMBER >= 0x030606
3004
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3005
#elif GNUTLS_VERSION_NUMBER < 0x030600
3006
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3008
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3011
fprintf_plus(stderr, "init_gnutls_global failed\n");
3012
exitcode = EX_UNAVAILABLE;
1308
3015
gnutls_initialized = true;
1470
3214
gpgme_release(mc.ctx);
1473
/* Take down the network interface */
1474
if(take_down_interface){
1475
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1477
perror("ioctl SIOCGIFFLAGS");
1478
} else if(network.ifr_flags & IFF_UP) {
1479
network.ifr_flags &= ~IFF_UP; /* clear flag */
1480
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1482
perror("ioctl SIOCSIFFLAGS");
1485
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1491
/* Removes the temp directory used by GPGME */
1492
if(tempdir_created){
1494
struct dirent *direntry;
1495
d = opendir(tempdir);
1497
if(errno != ENOENT){
1502
direntry = readdir(d);
1503
if(direntry == NULL){
1506
/* Skip "." and ".." */
1507
if(direntry->d_name[0] == '.'
1508
and (direntry->d_name[1] == '\0'
1509
or (direntry->d_name[1] == '.'
1510
and direntry->d_name[2] == '\0'))){
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", tempdir,
1520
ret = remove(fullname);
1522
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1529
ret = rmdir(tempdir);
1530
if(ret == -1 and errno != ENOENT){
3217
/* Cleans up the circular linked list of Mandos servers the client
3219
if(mc.current_server != NULL){
3220
mc.current_server->prev->next = NULL;
3221
while(mc.current_server != NULL){
3222
server *next = mc.current_server->next;
3224
#pragma GCC diagnostic push
3225
#pragma GCC diagnostic ignored "-Wcast-qual"
3227
free((char *)(mc.current_server->ip));
3229
#pragma GCC diagnostic pop
3231
free(mc.current_server);
3232
mc.current_server = next;
3236
/* Re-raise privileges */
3238
ret = raise_privileges();
3241
perror_plus("Failed to raise privileges");
3244
/* Run network hooks */
3245
run_network_hooks("stop", interfaces_hooks != NULL ?
3246
interfaces_hooks : "", delay);
3248
/* Take down the network interfaces which were brought up */
3250
char *interface = NULL;
3251
while((interface = argz_next(interfaces_to_take_down,
3252
interfaces_to_take_down_size,
3254
ret = take_down_interface(interface);
3257
perror_plus("Failed to take down interface");
3260
if(debug and (interfaces_to_take_down == NULL)){
3261
fprintf_plus(stderr, "No interfaces needed to be taken"
3267
ret = lower_privileges_permanently();
3270
perror_plus("Failed to lower privileges permanently");
3274
free(interfaces_to_take_down);
3275
free(interfaces_hooks);
3277
void clean_dir_at(int base, const char * const dirname,
3279
struct dirent **direntries = NULL;
3281
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3287
perror_plus("open");
3290
int numentries = scandirat(dir_fd, ".", &direntries,
3291
notdotentries, alphasort);
3292
if(numentries >= 0){
3293
for(int i = 0; i < numentries; i++){
3295
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3296
dirname, direntries[i]->d_name);
3298
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3300
if(errno == EISDIR){
3301
dret = unlinkat(dir_fd, direntries[i]->d_name,
3304
if((dret == -1) and (errno == ENOTEMPTY)
3305
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3306
== 0) and (level == 0)){
3307
/* Recurse only in this special case */
3308
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3311
if((dret == -1) and (errno != ENOENT)){
3312
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3313
direntries[i]->d_name, strerror(errno));
3316
free(direntries[i]);
3319
/* need to clean even if 0 because man page doesn't specify */
3321
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3322
if(dret == -1 and errno != ENOENT){
3323
perror_plus("rmdir");
3326
perror_plus("scandirat");
3331
/* Removes the GPGME temp directory and all files inside */
3332
if(tempdir != NULL){
3333
clean_dir_at(-1, tempdir, 0);
1536
3337
sigemptyset(&old_sigterm_action.sa_mask);
1537
3338
old_sigterm_action.sa_handler = SIG_DFL;
1538
ret = sigaction(signal_received, &old_sigterm_action, NULL);
3339
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3340
&old_sigterm_action,
1540
perror("sigaction");
1542
raise(signal_received);
3343
perror_plus("sigaction");
3346
ret = raise(signal_received);
3347
} while(ret != 0 and errno == EINTR);
3349
perror_plus("raise");
3352
TEMP_FAILURE_RETRY(pause());
1545
3355
return exitcode;