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 © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 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
139
#define PATHDIR "/conf/conf.d/mandos"
121
140
#define SECKEY "seckey.txt"
122
141
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
124
144
bool debug = false;
125
145
static const char mandos_protocol_version[] = "1";
126
146
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
static const char sys_class_net[] = "/sys/class/net";
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
159
AvahiIfIndex if_index;
161
struct timespec last_seen;
129
166
/* Used for passing in values through the Avahi callback functions */
131
AvahiSimplePoll *simple_poll;
132
168
AvahiServer *server;
133
169
gnutls_certificate_credentials_t cred;
134
170
unsigned int dh_bits;
135
171
gnutls_dh_params_t dh_params;
136
172
const char *priority;
174
server *current_server;
176
size_t interfaces_size;
138
177
} 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" };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
182
sig_atomic_t quit_now = 0;
183
int signal_received = 0;
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
197
va_start (ap, format);
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
146
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
206
* bytes. "buffer_capacity" is how much is currently allocated,
148
207
* "buffer_length" is how much is already used.
209
__attribute__((nonnull, warn_unused_result))
150
210
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
211
size_t buffer_capacity){
152
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
215
int old_errno = errno;
157
222
buffer_capacity += BUFFER_SIZE;
159
224
return buffer_capacity;
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
237
*new_server = (server){ .ip = strdup(ip),
239
.if_index = if_index,
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
248
perror_plus("clock_gettime");
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
253
free((char *)(new_server->ip));
255
#pragma GCC diagnostic pop
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
163
276
* Initialize GPGME.
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
168
283
gpgme_error_t rc;
169
284
gpgme_engine_info_t engine_info;
173
287
* Helper function to insert pub and seckey to the engine keyring.
175
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
177
292
gpgme_data_t pgp_data;
179
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
301
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));
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
192
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
193
308
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
316
perror_plus("close");
203
318
gpgme_data_release(pgp_data);
208
fprintf(stderr, "Initializing GPGME\n");
323
fprintf_plus(stderr, "Initializing GPGME\n");
212
327
gpgme_check_version(NULL);
213
328
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
329
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
220
/* Set GPGME home directory for the OpenPGP engine only */
335
/* Set GPGME home directory for the OpenPGP engine only */
221
336
rc = gpgme_get_engine_info(&engine_info);
222
337
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
227
342
while(engine_info != NULL){
266
385
ssize_t plaintext_length = 0;
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
272
391
/* Create new GPGME data buffer from memory cryptotext */
273
392
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
275
394
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));
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
281
400
/* Create new empty GPGME data buffer for the plaintext */
282
401
rc = gpgme_data_new(&dh_plain);
283
402
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
286
406
gpgme_data_release(dh_crypto);
290
410
/* Decrypt data from the cryptotext data buffer to the plaintext
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
413
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
296
416
plaintext_length = -1;
298
418
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
300
420
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
421
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);
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
427
fprintf_plus(stderr, "Wrong key usage: %u\n",
428
result->wrong_key_usage);
307
429
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
430
fprintf_plus(stderr, "File name: %s\n", result->file_name);
310
432
gpgme_recipient_t recipient;
311
433
recipient = result->recipients;
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
320
recipient = recipient->next;
434
while(recipient != NULL){
435
fprintf_plus(stderr, "Public key algorithm: %s\n",
436
gpgme_pubkey_algo_name
437
(recipient->pubkey_algo));
438
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
439
fprintf_plus(stderr, "Secret key available: %s\n",
440
recipient->status == GPG_ERR_NO_SECKEY
442
recipient = recipient->next;
420
544
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
545
ret = gnutls_certificate_allocate_credentials(&mc->cred);
422
546
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
safer_gnutls_strerror(ret));
428
gnutls_global_deinit();
547
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
548
safer_gnutls_strerror(ret));
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
438
559
ret = gnutls_certificate_set_openpgp_key_file
439
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
440
561
GNUTLS_OPENPGP_FMT_BASE64);
441
562
if(ret != GNUTLS_E_SUCCESS){
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
450
571
/* GnuTLS server initialization */
451
ret = gnutls_dh_params_init(&mc.dh_params);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
586
dhparamsfilename = NULL;
589
size_t params_capacity = 0;
591
params_capacity = incbuffer((char **)¶ms.data,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
598
dhparamsfilename = NULL;
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
608
/* check bytes_read for failure */
613
dhparamsfilename = NULL;
616
params.size += (unsigned int)bytes_read;
618
ret = close(dhpfile);
620
perror_plus("close");
622
if(params.data == NULL){
623
dhparamsfilename = NULL;
625
if(dhparamsfilename == NULL){
628
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
629
GNUTLS_X509_FMT_PEM);
630
if(ret != GNUTLS_E_SUCCESS){
631
fprintf_plus(stderr, "Failed to parse DH parameters in file"
632
" \"%s\": %s\n", dhparamsfilename,
633
safer_gnutls_strerror(ret));
634
dhparamsfilename = NULL;
639
if(dhparamsfilename == NULL){
640
if(mc->dh_bits == 0){
641
/* Find out the optimal number of DH bits */
642
/* Try to read the private key file */
643
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
645
int secfile = open(seckeyfilename, O_RDONLY);
650
size_t buffer_capacity = 0;
652
buffer_capacity = incbuffer((char **)&buffer.data,
654
(size_t)buffer_capacity);
655
if(buffer_capacity == 0){
656
perror_plus("incbuffer");
661
ssize_t bytes_read = read(secfile,
662
buffer.data + buffer.size,
668
/* check bytes_read for failure */
675
buffer.size += (unsigned int)bytes_read;
679
/* If successful, use buffer to parse private key */
680
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
681
if(buffer.data != NULL){
683
gnutls_openpgp_privkey_t privkey = NULL;
684
ret = gnutls_openpgp_privkey_init(&privkey);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error initializing OpenPGP key"
688
safer_gnutls_strerror(ret));
692
ret = gnutls_openpgp_privkey_import
693
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
694
if(ret != GNUTLS_E_SUCCESS){
695
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
696
safer_gnutls_strerror(ret));
702
/* Use private key to suggest an appropriate
704
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
705
gnutls_openpgp_privkey_deinit(privkey);
707
fprintf_plus(stderr, "This OpenPGP key implies using"
708
" a GnuTLS security parameter \"%s\".\n",
709
safe_string(gnutls_sec_param_get_name
715
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
716
/* Err on the side of caution */
717
sec_param = GNUTLS_SEC_PARAM_ULTRA;
719
fprintf_plus(stderr, "Falling back to security parameter"
721
safe_string(gnutls_sec_param_get_name
726
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
730
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
731
" implies %u DH bits; using that.\n",
732
safe_string(gnutls_sec_param_get_name
737
fprintf_plus(stderr, "Failed to get implied number of DH"
738
" bits for security parameter \"%s\"): %s\n",
739
safe_string(gnutls_sec_param_get_name
741
safer_gnutls_strerror(ret));
745
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
748
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
749
if(ret != GNUTLS_E_SUCCESS){
750
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
751
" bits): %s\n", mc->dh_bits,
752
safer_gnutls_strerror(ret));
756
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
470
gnutls_certificate_free_credentials(mc.cred);
471
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
762
gnutls_certificate_free_credentials(mc->cred);
763
gnutls_dh_params_deinit(mc->dh_params);
476
static int init_gnutls_session(gnutls_session_t *session){
767
__attribute__((nonnull, warn_unused_result))
768
static int init_gnutls_session(gnutls_session_t *session,
478
771
/* GnuTLS session creation */
479
ret = gnutls_init(session, GNUTLS_SERVER);
773
ret = gnutls_init(session, GNUTLS_SERVER);
777
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
778
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
780
"Error in GnuTLS session initialization: %s\n",
781
safer_gnutls_strerror(ret));
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
787
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
789
gnutls_deinit(*session);
792
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
793
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
794
fprintf_plus(stderr, "Syntax error at: %s\n", err);
795
fprintf_plus(stderr, "GnuTLS error: %s\n",
796
safer_gnutls_strerror(ret));
492
797
gnutls_deinit(*session);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
803
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
806
gnutls_deinit(*session);
809
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
499
810
if(ret != GNUTLS_E_SUCCESS){
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
811
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
812
safer_gnutls_strerror(ret));
502
813
gnutls_deinit(*session);
506
817
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
818
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
516
824
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
517
825
__attribute__((unused)) const char *txt){}
827
/* Set effective uid to 0, return errno */
828
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
832
if(seteuid(0) == -1){
839
/* Set effective and real user ID to 0. Return errno. */
840
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
855
/* Set effective user ID to unprivileged saved user ID */
856
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
860
if(seteuid(uid) == -1){
867
/* Lower privileges permanently */
868
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
872
if(setuid(uid) == -1){
879
/* Helper function to add_local_route() and delete_local_route() */
880
__attribute__((nonnull, warn_unused_result))
881
static bool add_delete_local_route(const bool add,
883
AvahiIfIndex if_index){
885
char helper[] = "mandos-client-iprouteadddel";
886
char add_arg[] = "add";
887
char delete_arg[] = "delete";
888
char debug_flag[] = "--debug";
889
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
890
if(pluginhelperdir == NULL){
892
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
893
" variable not set; cannot run helper\n");
898
char interface[IF_NAMESIZE];
899
if(if_indextoname((unsigned int)if_index, interface) == NULL){
900
perror_plus("if_indextoname");
904
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
906
perror_plus("open(\"/dev/null\", O_RDONLY)");
912
/* Raise privileges */
913
errno = raise_privileges_permanently();
915
perror_plus("Failed to raise privileges");
916
/* _exit(EX_NOPERM); */
922
perror_plus("setgid");
925
/* Reset supplementary groups */
927
ret = setgroups(0, NULL);
929
perror_plus("setgroups");
933
ret = dup2(devnull, STDIN_FILENO);
935
perror_plus("dup2(devnull, STDIN_FILENO)");
938
ret = close(devnull);
940
perror_plus("close");
943
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
945
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
948
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
953
if(helperdir_fd == -1){
955
_exit(EX_UNAVAILABLE);
957
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
960
perror_plus("openat");
962
_exit(EX_UNAVAILABLE);
966
#pragma GCC diagnostic push
967
#pragma GCC diagnostic ignored "-Wcast-qual"
969
if(fexecve(helper_fd, (char *const [])
970
{ helper, add ? add_arg : delete_arg, (char *)address,
971
interface, debug ? debug_flag : NULL, NULL },
974
#pragma GCC diagnostic pop
976
perror_plus("fexecve");
988
pret = waitpid(pid, &status, 0);
989
if(pret == -1 and errno == EINTR and quit_now){
990
int errno_raising = 0;
991
if((errno = raise_privileges()) != 0){
992
errno_raising = errno;
993
perror_plus("Failed to raise privileges in order to"
994
" kill helper program");
996
if(kill(pid, SIGTERM) == -1){
999
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1000
perror_plus("Failed to lower privileges after killing"
1005
} while(pret == -1 and errno == EINTR);
1007
perror_plus("waitpid");
1010
if(WIFEXITED(status)){
1011
if(WEXITSTATUS(status) != 0){
1012
fprintf_plus(stderr, "Error: iprouteadddel exited"
1013
" with status %d\n", WEXITSTATUS(status));
1018
if(WIFSIGNALED(status)){
1019
fprintf_plus(stderr, "Error: iprouteadddel died by"
1020
" signal %d\n", WTERMSIG(status));
1023
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool add_local_route(const char *address,
1029
AvahiIfIndex if_index){
1031
fprintf_plus(stderr, "Adding route to %s\n", address);
1033
return add_delete_local_route(true, address, if_index);
1036
__attribute__((nonnull, warn_unused_result))
1037
static bool delete_local_route(const char *address,
1038
AvahiIfIndex if_index){
1040
fprintf_plus(stderr, "Removing route to %s\n", address);
1042
return add_delete_local_route(false, address, if_index);
519
1045
/* Called when a Mandos server is found */
520
static int start_mandos_communication(const char *ip, uint16_t port,
1046
__attribute__((nonnull, warn_unused_result))
1047
static int start_mandos_communication(const char *ip, in_port_t port,
521
1048
AvahiIfIndex if_index,
1049
int af, mandos_context *mc){
1050
int ret, tcp_sd = -1;
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
1052
struct sockaddr_storage to;
529
1053
char *buffer = NULL;
530
char *decrypted_buffer;
1054
char *decrypted_buffer = NULL;
531
1055
size_t buffer_length = 0;
532
1056
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
536
1059
gnutls_session_t session;
537
1060
int pf; /* Protocol family */
1061
bool route_added = false;
547
fprintf(stderr, "Bad address family: %d\n", af);
1078
fprintf_plus(stderr, "Bad address family: %d\n", af);
551
ret = init_gnutls_session(&session);
1083
/* If the interface is specified and we have a list of interfaces */
1084
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1085
/* Check if the interface is one of the interfaces we are using */
1088
char *interface = NULL;
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1092
if(if_nametoindex(interface) == (unsigned int)if_index){
1099
/* This interface does not match any in the list, so we don't
1100
connect to the server */
1102
char interface[IF_NAMESIZE];
1103
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1104
perror_plus("if_indextoname");
1106
fprintf_plus(stderr, "Skipping server on non-used interface"
1108
if_indextoname((unsigned int)if_index,
1116
ret = init_gnutls_session(&session, mc);
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
1122
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1123
PRIuMAX "\n", ip, (uintmax_t)port);
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
1126
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
567
memset(&to, 0, sizeof(to));
1129
perror_plus("socket");
568
1139
if(af == AF_INET6){
569
to.in6.sin6_family = (sa_family_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1140
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1141
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1142
ret = inet_pton(af, ip, &to6->sin6_addr);
571
1143
} else { /* IPv4 */
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
1144
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1145
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1146
ret = inet_pton(af, ip, &to4->sin_addr);
1150
perror_plus("inet_pton");
580
fprintf(stderr, "Bad address: %s\n", ip);
1156
fprintf_plus(stderr, "Bad address: %s\n", ip);
583
1160
if(af == AF_INET6){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
586
-Wunreachable-code */
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
1161
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1162
if(IN6_IS_ADDR_LINKLOCAL
1163
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
591
1164
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
1165
fprintf_plus(stderr, "An IPv6 link-local address is"
1166
" incomplete without a network interface\n");
596
1170
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
1171
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
600
to.in.sin_port = htons(port); /* Spurious warnings from
602
-Wunreachable-code */
1174
((struct sockaddr_in *)&to)->sin_port = htons(port);
606
1183
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
1184
char interface[IF_NAMESIZE];
608
1185
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
1186
perror_plus("if_indextoname");
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
1188
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1189
"\n", ip, interface, (uintmax_t)port);
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1192
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1193
ip, (uintmax_t)port);
618
1195
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
1196
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
631
if(strcmp(addrstr, ip) != 0){
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in6),
1200
addrstr, sizeof(addrstr), NULL, 0,
1203
ret = getnameinfo((struct sockaddr *)&to,
1204
sizeof(struct sockaddr_in),
1205
addrstr, sizeof(addrstr), NULL, 0,
1208
if(ret == EAI_SYSTEM){
1209
perror_plus("getnameinfo");
1210
} else if(ret != 0) {
1211
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1212
} else if(strcmp(addrstr, ip) != 0){
1213
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1224
ret = connect(tcp_sd, (struct sockaddr *)&to,
1225
sizeof(struct sockaddr_in6));
1227
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1228
sizeof(struct sockaddr_in));
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1232
and if_index != AVAHI_IF_UNSPEC
1233
and connect_to == NULL
1234
and not route_added and
1235
((af == AF_INET6 and not
1236
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1238
or (af == AF_INET and
1239
/* Not a a IPv4LL address */
1240
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1241
& 0xFFFF0000L) != 0xA9FE0000L))){
1242
/* Work around Avahi bug - Avahi does not announce link-local
1243
addresses if it has a global address, so local hosts with
1244
*only* a link-local address (e.g. Mandos clients) cannot
1245
connect to a Mandos server announced by Avahi on a server
1246
host with a global address. Work around this by retrying
1247
with an explicit route added with the server's address.
1249
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
https://bugs.debian.org/587961
1254
fprintf_plus(stderr, "Mandos server unreachable, trying"
1258
route_added = add_local_route(ip, if_index);
1264
if(errno != ECONNREFUSED or debug){
1266
perror_plus("connect");
647
1279
const char *out = mandos_protocol_version;
871
1618
case AVAHI_BROWSER_ALL_FOR_NOW:
872
1619
case AVAHI_BROWSER_CACHE_EXHAUSTED:
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1621
fprintf_plus(stderr, "No Mandos server found, still"
880
sig_atomic_t quit_now = 0;
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1628
/* Signal handler that stops main loop after SIGTERM */
1629
static void handle_sigterm(int sig){
888
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
1634
signal_received = sig;
1635
int old_errno = errno;
1636
/* set main loop to exit */
1637
if(simple_poll != NULL){
1638
avahi_simple_poll_quit(simple_poll);
1643
__attribute__((nonnull, warn_unused_result))
1644
bool get_flags(const char *ifname, struct ifreq *ifr){
1648
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1651
perror_plus("socket");
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1657
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1661
perror_plus("ioctl SIOCGIFFLAGS");
1664
if((close(s) == -1) and debug){
1666
perror_plus("close");
1671
if((close(s) == -1) and debug){
1673
perror_plus("close");
1679
__attribute__((nonnull, warn_unused_result))
1680
bool good_flags(const char *ifname, const struct ifreq *ifr){
1682
/* Reject the loopback device */
1683
if(ifr->ifr_flags & IFF_LOOPBACK){
1685
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1690
/* Accept point-to-point devices only if connect_to is specified */
1691
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1693
fprintf_plus(stderr, "Accepting point-to-point interface"
1694
" \"%s\"\n", ifname);
1698
/* Otherwise, reject non-broadcast-capable devices */
1699
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1701
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1702
" \"%s\"\n", ifname);
1706
/* Reject non-ARP interfaces (including dummy interfaces) */
1707
if(ifr->ifr_flags & IFF_NOARP){
1709
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1715
/* Accept this device */
1717
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1723
* This function determines if a directory entry in /sys/class/net
1724
* corresponds to an acceptable network device.
1725
* (This function is passed to scandir(3) as a filter function.)
1727
__attribute__((nonnull, warn_unused_result))
1728
int good_interface(const struct dirent *if_entry){
1729
if(if_entry->d_name[0] == '.'){
1734
if(not get_flags(if_entry->d_name, &ifr)){
1736
fprintf_plus(stderr, "Failed to get flags for interface "
1737
"\"%s\"\n", if_entry->d_name);
1742
if(not good_flags(if_entry->d_name, &ifr)){
1749
* This function determines if a network interface is up.
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_up(const char *interface){
1754
if(not get_flags(interface, &ifr)){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1762
return (bool)(ifr.ifr_flags & IFF_UP);
1766
* This function determines if a network interface is running
1768
__attribute__((nonnull, warn_unused_result))
1769
bool interface_is_running(const char *interface){
1771
if(not get_flags(interface, &ifr)){
1773
fprintf_plus(stderr, "Failed to get flags for interface "
1774
"\"%s\"\n", interface);
1779
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1782
__attribute__((nonnull, pure, warn_unused_result))
1783
int notdotentries(const struct dirent *direntry){
1784
/* Skip "." and ".." */
1785
if(direntry->d_name[0] == '.'
1786
and (direntry->d_name[1] == '\0'
1787
or (direntry->d_name[1] == '.'
1788
and direntry->d_name[2] == '\0'))){
1794
/* Is this directory entry a runnable program? */
1795
__attribute__((nonnull, warn_unused_result))
1796
int runnable_hook(const struct dirent *direntry){
1801
if((direntry->d_name)[0] == '\0'){
1806
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1807
"abcdefghijklmnopqrstuvwxyz"
1810
if((direntry->d_name)[sret] != '\0'){
1811
/* Contains non-allowed characters */
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1819
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1822
perror_plus("Could not stat hook");
1826
if(not (S_ISREG(st.st_mode))){
1827
/* Not a regular file */
1829
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1834
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1835
/* Not executable */
1837
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1843
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1849
__attribute__((nonnull, warn_unused_result))
1850
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1851
mandos_context *mc){
1853
struct timespec now;
1854
struct timespec waited_time;
1855
intmax_t block_time;
1858
if(mc->current_server == NULL){
1860
fprintf_plus(stderr, "Wait until first server is found."
1863
ret = avahi_simple_poll_iterate(s, -1);
1866
fprintf_plus(stderr, "Check current_server if we should run"
1869
/* the current time */
1870
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1872
perror_plus("clock_gettime");
1875
/* Calculating in ms how long time between now and server
1876
who we visted longest time ago. Now - last seen. */
1877
waited_time.tv_sec = (now.tv_sec
1878
- mc->current_server->last_seen.tv_sec);
1879
waited_time.tv_nsec = (now.tv_nsec
1880
- mc->current_server->last_seen.tv_nsec);
1881
/* total time is 10s/10,000ms.
1882
Converting to s from ms by dividing by 1,000,
1883
and ns to ms by dividing by 1,000,000. */
1884
block_time = ((retry_interval
1885
- ((intmax_t)waited_time.tv_sec * 1000))
1886
- ((intmax_t)waited_time.tv_nsec / 1000000));
1889
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1893
if(block_time <= 0){
1894
ret = start_mandos_communication(mc->current_server->ip,
1895
mc->current_server->port,
1896
mc->current_server->if_index,
1897
mc->current_server->af, mc);
1899
avahi_simple_poll_quit(s);
1902
ret = clock_gettime(CLOCK_MONOTONIC,
1903
&mc->current_server->last_seen);
1905
perror_plus("clock_gettime");
1908
mc->current_server = mc->current_server->next;
1909
block_time = 0; /* Call avahi to find new Mandos
1910
servers, but don't block */
1913
ret = avahi_simple_poll_iterate(s, (int)block_time);
1916
if(ret > 0 or errno != EINTR){
1917
return (ret != 1) ? ret : 0;
1923
__attribute__((nonnull))
1924
void run_network_hooks(const char *mode, const char *interface,
1926
struct dirent **direntries = NULL;
1927
if(hookdir_fd == -1){
1928
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1930
if(hookdir_fd == -1){
1931
if(errno == ENOENT){
1933
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1934
" found\n", hookdir);
1937
perror_plus("open");
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1947
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1948
runnable_hook, alphasort);
1950
perror_plus("scandir");
1954
struct dirent *direntry;
1956
for(int i = 0; i < numhooks; i++){
1957
direntry = direntries[i];
1959
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1962
pid_t hook_pid = fork();
1965
/* Raise privileges */
1966
errno = raise_privileges_permanently();
1968
perror_plus("Failed to raise privileges");
1975
perror_plus("setgid");
1978
/* Reset supplementary groups */
1980
ret = setgroups(0, NULL);
1982
perror_plus("setgroups");
1985
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1987
perror_plus("setenv");
1990
ret = setenv("DEVICE", interface, 1);
1992
perror_plus("setenv");
1995
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1997
perror_plus("setenv");
2000
ret = setenv("MODE", mode, 1);
2002
perror_plus("setenv");
2006
ret = asprintf(&delaystring, "%f", (double)delay);
2008
perror_plus("asprintf");
2011
ret = setenv("DELAY", delaystring, 1);
2014
perror_plus("setenv");
2018
if(connect_to != NULL){
2019
ret = setenv("CONNECT", connect_to, 1);
2021
perror_plus("setenv");
2025
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2029
perror_plus("openat");
2030
_exit(EXIT_FAILURE);
2032
if(close(hookdir_fd) == -1){
2033
perror_plus("close");
2034
_exit(EXIT_FAILURE);
2036
ret = dup2(devnull, STDIN_FILENO);
2038
perror_plus("dup2(devnull, STDIN_FILENO)");
2041
ret = close(devnull);
2043
perror_plus("close");
2046
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2048
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2051
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2053
perror_plus("fexecve");
2054
_exit(EXIT_FAILURE);
2058
perror_plus("fork");
2063
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2064
perror_plus("waitpid");
2068
if(WIFEXITED(status)){
2069
if(WEXITSTATUS(status) != 0){
2070
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2071
" with status %d\n", direntry->d_name,
2072
WEXITSTATUS(status));
2076
} else if(WIFSIGNALED(status)){
2077
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2078
" signal %d\n", direntry->d_name,
2083
fprintf_plus(stderr, "Warning: network hook \"%s\""
2084
" crashed\n", direntry->d_name);
2090
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2096
if(close(hookdir_fd) == -1){
2097
perror_plus("close");
2104
__attribute__((nonnull, warn_unused_result))
2105
int bring_up_interface(const char *const interface,
2107
int old_errno = errno;
2109
struct ifreq network;
2110
unsigned int if_index = if_nametoindex(interface);
2112
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2122
if(not interface_is_up(interface)){
2124
int ioctl_errno = 0;
2125
if(not get_flags(interface, &network)){
2127
fprintf_plus(stderr, "Failed to get flags for interface "
2128
"\"%s\"\n", interface);
2132
network.ifr_flags |= IFF_UP; /* set flag */
2134
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2137
perror_plus("socket");
2145
perror_plus("close");
2152
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2156
/* Raise privileges */
2157
ret_errno = raise_privileges();
2160
perror_plus("Failed to raise privileges");
2165
bool restore_loglevel = false;
2167
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2168
messages about the network interface to mess up the prompt */
2169
ret_linux = klogctl(8, NULL, 5);
2170
if(ret_linux == -1){
2171
perror_plus("klogctl");
2173
restore_loglevel = true;
2176
#endif /* __linux__ */
2177
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2178
ioctl_errno = errno;
2180
if(restore_loglevel){
2181
ret_linux = klogctl(7, NULL, 0);
2182
if(ret_linux == -1){
2183
perror_plus("klogctl");
2186
#endif /* __linux__ */
2188
/* If raise_privileges() succeeded above */
2190
/* Lower privileges */
2191
ret_errno = lower_privileges();
2194
perror_plus("Failed to lower privileges");
2198
/* Close the socket */
2201
perror_plus("close");
2204
if(ret_setflags == -1){
2205
errno = ioctl_errno;
2206
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2211
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2215
/* Sleep checking until interface is running.
2216
Check every 0.25s, up to total time of delay */
2217
for(int i = 0; i < delay * 4; i++){
2218
if(interface_is_running(interface)){
2221
struct timespec sleeptime = { .tv_nsec = 250000000 };
2222
ret = nanosleep(&sleeptime, NULL);
2223
if(ret == -1 and errno != EINTR){
2224
perror_plus("nanosleep");
2232
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
2235
struct ifreq network;
2236
unsigned int if_index = if_nametoindex(interface);
2238
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2242
if(interface_is_up(interface)){
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network) and debug){
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2252
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2257
perror_plus("socket");
2263
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2267
/* Raise privileges */
2268
ret_errno = raise_privileges();
2271
perror_plus("Failed to raise privileges");
2274
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2275
ioctl_errno = errno;
2277
/* If raise_privileges() succeeded above */
2279
/* Lower privileges */
2280
ret_errno = lower_privileges();
2283
perror_plus("Failed to lower privileges");
2287
/* Close the socket */
2288
int ret = close(sd);
2290
perror_plus("close");
2293
if(ret_setflags == -1){
2294
errno = ioctl_errno;
2295
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2300
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
895
2308
int main(int argc, char *argv[]){
2309
mandos_context mc = { .server = NULL, .dh_bits = 0,
2310
.priority = "SECURE256:!CTYPE-X.509"
2311
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2312
.current_server = NULL, .interfaces = NULL,
2313
.interfaces_size = 0 };
896
2314
AvahiSServiceBrowser *sb = NULL;
899
2317
intmax_t tmpmax;
901
2319
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
903
struct ifreq network;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
bool tempdir_created = false;
2320
char *interfaces_to_take_down = NULL;
2321
size_t interfaces_to_take_down_size = 0;
2322
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2323
char old_tempdir[] = "/tmp/mandosXXXXXX";
2324
char *tempdir = NULL;
910
2325
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
2326
const char *seckey = PATHDIR "/" SECKEY;
912
2327
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
2329
char *interfaces_hooks = NULL;
914
2331
bool gnutls_initialized = false;
915
2332
bool gpgme_initialized = false;
916
2333
float delay = 2.5f;
2334
double retry_interval = 10; /* 10s between trying a server and
2335
retrying the same server again */
918
struct sigaction old_sigterm_action;
2337
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
2338
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2343
/* Lower any group privileges we might have, just to be safe */
2347
perror_plus("setgid");
2350
/* Lower user privileges (temporarily) */
2354
perror_plus("seteuid");
922
2362
struct argp_option options[] = {
923
2363
{ .name = "debug", .key = 128,
991
2460
delay = strtof(arg, &tmp);
992
2461
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
2462
argp_error(state, "Bad delay");
2464
case 132: /* --retry */
2466
retry_interval = strtod(arg, &tmp);
2467
if(errno != 0 or tmp == arg or *tmp != '\0'
2468
or (retry_interval * 1000) > INT_MAX
2469
or retry_interval < 0){
2470
argp_error(state, "Bad retry interval");
2473
case 133: /* --network-hook-dir */
2477
* These reproduce what we would get without ARGP_NO_HELP
2479
case '?': /* --help */
2480
argp_state_help(state, state->out_stream,
2481
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2482
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2483
case -3: /* --usage */
2484
argp_state_help(state, state->out_stream,
2485
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2486
case 'V': /* --version */
2487
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2488
exit(argp_err_exit_status);
1002
2491
return ARGP_ERR_UNKNOWN;
1007
2496
struct argp argp = { .options = options, .parser = parse_opt,
1008
2497
.args_doc = "",
1009
2498
.doc = "Mandos client -- Get and decrypt"
1010
2499
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2508
perror_plus("argp_parse");
2509
exitcode = EX_OSERR;
2512
exitcode = EX_USAGE;
2518
/* Work around Debian bug #633582:
2519
<https://bugs.debian.org/633582> */
2521
/* Re-raise privileges */
2522
ret = raise_privileges();
2525
perror_plus("Failed to raise privileges");
2529
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2530
int seckey_fd = open(seckey, O_RDONLY);
2531
if(seckey_fd == -1){
2532
perror_plus("open");
2534
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2536
perror_plus("fstat");
2538
if(S_ISREG(st.st_mode)
2539
and st.st_uid == 0 and st.st_gid == 0){
2540
ret = fchown(seckey_fd, uid, gid);
2542
perror_plus("fchown");
2550
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2551
int pubkey_fd = open(pubkey, O_RDONLY);
2552
if(pubkey_fd == -1){
2553
perror_plus("open");
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2557
perror_plus("fstat");
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(pubkey_fd, uid, gid);
2563
perror_plus("fchown");
2571
if(dh_params_file != NULL
2572
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2573
int dhparams_fd = open(dh_params_file, O_RDONLY);
2574
if(dhparams_fd == -1){
2575
perror_plus("open");
2577
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2579
perror_plus("fstat");
2581
if(S_ISREG(st.st_mode)
2582
and st.st_uid == 0 and st.st_gid == 0){
2583
ret = fchown(dhparams_fd, uid, gid);
2585
perror_plus("fchown");
2593
/* Lower privileges */
2594
ret = lower_privileges();
2597
perror_plus("Failed to lower privileges");
2602
/* Remove invalid interface names (except "none") */
2604
char *interface = NULL;
2605
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2607
if(strcmp(interface, "none") != 0
2608
and if_nametoindex(interface) == 0){
2609
if(interface[0] != '\0'){
2610
fprintf_plus(stderr, "Not using nonexisting interface"
2611
" \"%s\"\n", interface);
2613
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2619
/* Run network hooks */
2621
if(mc.interfaces != NULL){
2622
interfaces_hooks = malloc(mc.interfaces_size);
2623
if(interfaces_hooks == NULL){
2624
perror_plus("malloc");
2627
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2628
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2630
run_network_hooks("start", interfaces_hooks != NULL ?
2631
interfaces_hooks : "", delay);
1024
2639
from the signal handler */
1025
2640
/* Initialize the pseudo-RNG for Avahi */
1026
2641
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
2642
simple_poll = avahi_simple_poll_new();
2643
if(simple_poll == NULL){
2644
fprintf_plus(stderr,
2645
"Avahi: Failed to create simple poll object.\n");
2646
exitcode = EX_UNAVAILABLE;
1034
2650
sigemptyset(&sigterm_action.sa_mask);
1035
2651
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
2653
perror_plus("sigaddset");
2654
exitcode = EX_OSERR;
1041
2657
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
2659
perror_plus("sigaddset");
2660
exitcode = EX_OSERR;
1047
2663
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1068
restore_loglevel = false;
1071
#endif /* __linux__ */
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1076
exitcode = EXIT_FAILURE;
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1084
#endif /* __linux__ */
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1090
perror("ioctl SIOCGIFFLAGS");
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
2665
perror_plus("sigaddset");
2666
exitcode = EX_OSERR;
2669
/* Need to check if the handler is SIG_IGN before handling:
2670
| [[info:libc:Initial Signal Actions]] |
2671
| [[info:libc:Basic Signal Handling]] |
2673
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2675
perror_plus("sigaction");
2678
if(old_sigterm_action.sa_handler != SIG_IGN){
2679
ret = sigaction(SIGINT, &sigterm_action, NULL);
2681
perror_plus("sigaction");
2682
exitcode = EX_OSERR;
2686
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2688
perror_plus("sigaction");
2691
if(old_sigterm_action.sa_handler != SIG_IGN){
2692
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2694
perror_plus("sigaction");
2695
exitcode = EX_OSERR;
2699
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2701
perror_plus("sigaction");
2704
if(old_sigterm_action.sa_handler != SIG_IGN){
2705
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2707
perror_plus("sigaction");
2708
exitcode = EX_OSERR;
2713
/* If no interfaces were specified, make a list */
2714
if(mc.interfaces == NULL){
2715
struct dirent **direntries = NULL;
2716
/* Look for any good interfaces */
2717
ret = scandir(sys_class_net, &direntries, good_interface,
2720
/* Add all found interfaces to interfaces list */
2721
for(int i = 0; i < ret; ++i){
2722
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2723
direntries[i]->d_name);
2726
perror_plus("argz_add");
2727
free(direntries[i]);
2731
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2732
direntries[i]->d_name);
2734
free(direntries[i]);
2741
fprintf_plus(stderr, "Could not find a network interface\n");
2742
exitcode = EXIT_FAILURE;
2747
/* Bring up interfaces which are down, and remove any "none"s */
2749
char *interface = NULL;
2750
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2752
/* If interface name is "none", stop bringing up interfaces.
2753
Also remove all instances of "none" from the list */
2754
if(strcmp(interface, "none") == 0){
2755
argz_delete(&mc.interfaces, &mc.interfaces_size,
2758
while((interface = argz_next(mc.interfaces,
2759
mc.interfaces_size, interface))){
2760
if(strcmp(interface, "none") == 0){
2761
argz_delete(&mc.interfaces, &mc.interfaces_size,
1115
#endif /* __linux__ */
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1145
#endif /* __linux__ */
1162
ret = init_gnutls_global(pubkey, seckey);
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2768
bool interface_was_up = interface_is_up(interface);
2769
errno = bring_up_interface(interface, delay);
2770
if(not interface_was_up){
2772
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2773
" %s\n", interface, strerror(errno));
2775
errno = argz_add(&interfaces_to_take_down,
2776
&interfaces_to_take_down_size,
2779
perror_plus("argz_add");
2784
if(debug and (interfaces_to_take_down == NULL)){
2785
fprintf_plus(stderr, "No interfaces were brought up\n");
2789
/* If we only got one interface, explicitly use only that one */
2790
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2792
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2795
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2804
fprintf_plus(stderr, "init_gnutls_global failed\n");
2805
exitcode = EX_UNAVAILABLE;
1168
2808
gnutls_initialized = true;
1171
if(mkdtemp(tempdir) == NULL){
1175
tempdir_created = true;
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2815
/* Try /run/tmp before /tmp */
2816
tempdir = mkdtemp(run_tempdir);
2817
if(tempdir == NULL and errno == ENOENT){
2819
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2820
run_tempdir, old_tempdir);
2822
tempdir = mkdtemp(old_tempdir);
2824
if(tempdir == NULL){
2825
perror_plus("mkdtemp");
2833
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2834
fprintf_plus(stderr, "init_gpgme failed\n");
2835
exitcode = EX_UNAVAILABLE;
1182
2838
gpgme_initialized = true;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1194
2845
if(connect_to != NULL){
1195
2846
/* Connect directly, do not use Zeroconf */
1196
2847
/* (Mainly meant for debugging) */
1197
2848
char *address = strrchr(connect_to, ':');
1198
2850
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
2851
fprintf_plus(stderr, "No colon in address\n");
2852
exitcode = EX_USAGE;
1205
2862
tmpmax = strtoimax(address+1, &tmp, 10);
1206
2863
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1212
port = (uint16_t)tmpmax;
2864
or tmpmax != (in_port_t)tmpmax){
2865
fprintf_plus(stderr, "Bad port number\n");
2866
exitcode = EX_USAGE;
2874
port = (in_port_t)tmpmax;
1213
2875
*address = '\0';
1214
address = connect_to;
1215
2876
/* Colon in address indicates IPv6 */
1217
if(strchr(address, ':') != NULL){
2878
if(strchr(connect_to, ':') != NULL){
2880
/* Accept [] around IPv6 address - see RFC 5952 */
2881
if(connect_to[0] == '[' and address[-1] == ']')
1222
ret = start_mandos_communication(address, port, if_index, af);
1224
exitcode = EXIT_FAILURE;
2889
address = connect_to;
2895
while(not quit_now){
2896
ret = start_mandos_communication(address, port, if_index, af,
2898
if(quit_now or ret == 0){
2902
fprintf_plus(stderr, "Retrying in %d seconds\n",
2903
(int)retry_interval);
2905
sleep((unsigned int)retry_interval);
1226
2909
exitcode = EXIT_SUCCESS;
1232
2920
AvahiServerConfig config;
1233
2921
/* Do not publish any local Zeroconf records */
1299
3007
gpgme_release(mc.ctx);
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1308
if(errno != ENOENT){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1331
ret = remove(fullname);
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
3010
/* Cleans up the circular linked list of Mandos servers the client
3012
if(mc.current_server != NULL){
3013
mc.current_server->prev->next = NULL;
3014
while(mc.current_server != NULL){
3015
server *next = mc.current_server->next;
3017
#pragma GCC diagnostic push
3018
#pragma GCC diagnostic ignored "-Wcast-qual"
3020
free((char *)(mc.current_server->ip));
3022
#pragma GCC diagnostic pop
3024
free(mc.current_server);
3025
mc.current_server = next;
3029
/* Re-raise privileges */
3031
ret = raise_privileges();
3034
perror_plus("Failed to raise privileges");
3037
/* Run network hooks */
3038
run_network_hooks("stop", interfaces_hooks != NULL ?
3039
interfaces_hooks : "", delay);
3041
/* Take down the network interfaces which were brought up */
3043
char *interface = NULL;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3047
ret = take_down_interface(interface);
3050
perror_plus("Failed to take down interface");
3053
if(debug and (interfaces_to_take_down == NULL)){
3054
fprintf_plus(stderr, "No interfaces needed to be taken"
3060
ret = lower_privileges_permanently();
3063
perror_plus("Failed to lower privileges permanently");
3067
free(interfaces_to_take_down);
3068
free(interfaces_hooks);
3070
void clean_dir_at(int base, const char * const dirname,
3072
struct dirent **direntries = NULL;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3080
perror_plus("open");
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
3086
for(int i = 0; i < numentries; i++){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3109
free(direntries[i]);
3112
/* need to clean even if 0 because man page doesn't specify */
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3119
perror_plus("scandirat");
3124
/* Removes the GPGME temp directory and all files inside */
3125
if(tempdir != NULL){
3126
clean_dir_at(-1, tempdir, 0);
3130
sigemptyset(&old_sigterm_action.sa_mask);
3131
old_sigterm_action.sa_handler = SIG_DFL;
3132
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3133
&old_sigterm_action,
3136
perror_plus("sigaction");
3139
ret = raise(signal_received);
3140
} while(ret != 0 and errno == EINTR);
3142
perror_plus("raise");
3145
TEMP_FAILURE_RETRY(pause());
1346
3148
return exitcode;