9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
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
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
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,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
153
172
const char *priority;
155
174
server *current_server;
176
size_t interfaces_size;
156
177
} mandos_context;
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
164
182
sig_atomic_t quit_now = 0;
165
183
int signal_received = 0;
167
185
/* Function to use when printing errors */
168
186
void perror_plus(const char *print_text){
169
188
fprintf(stderr, "Mandos plugin %s: ",
170
189
program_invocation_short_name);
171
191
perror(print_text);
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));
175
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
206
* bytes. "buffer_capacity" is how much is currently allocated,
177
207
* "buffer_length" is how much is already used.
209
__attribute__((nonnull, warn_unused_result))
179
210
size_t incbuffer(char **buffer, size_t buffer_length,
180
size_t buffer_capacity){
211
size_t buffer_capacity){
181
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
215
int old_errno = errno;
186
222
buffer_capacity += BUFFER_SIZE;
188
224
return buffer_capacity;
191
227
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
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){
196
232
server *new_server = malloc(sizeof(server));
197
233
if(new_server == NULL){
198
234
perror_plus("malloc");
201
237
*new_server = (server){ .ip = strdup(ip),
203
.if_index = if_index,
239
.if_index = if_index,
205
241
if(new_server->ip == NULL){
206
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
209
260
/* Special case of first server */
210
if (mc.current_server == NULL){
261
if(*current_server == NULL){
211
262
new_server->next = new_server;
212
263
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
264
*current_server = new_server;
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
218
269
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
223
perror_plus("clock_gettime");
270
(*current_server)->prev = new_server;
275
/* Set effective uid to 0, return errno */
276
__attribute__((warn_unused_result))
277
int raise_privileges(void){
278
int old_errno = errno;
280
if(seteuid(0) == -1){
287
/* Set effective and real user ID to 0. Return errno. */
288
__attribute__((warn_unused_result))
289
int raise_privileges_permanently(void){
290
int old_errno = errno;
291
int ret = raise_privileges();
303
/* Set effective user ID to unprivileged saved user ID */
304
__attribute__((warn_unused_result))
305
int lower_privileges(void){
306
int old_errno = errno;
308
if(seteuid(uid) == -1){
315
/* Lower privileges permanently */
316
__attribute__((warn_unused_result))
317
int lower_privileges_permanently(void){
318
int old_errno = errno;
320
if(setuid(uid) == -1){
230
328
* Initialize GPGME.
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
330
__attribute__((nonnull, warn_unused_result))
331
static bool init_gpgme(const char * const seckey,
332
const char * const pubkey,
333
const char * const tempdir,
234
335
gpgme_error_t rc;
235
336
gpgme_engine_info_t engine_info;
239
339
* Helper function to insert pub and seckey to the engine keyring.
241
bool import_key(const char *filename){
341
bool import_key(const char * const filename){
244
344
gpgme_data_t pgp_data;
352
/* Workaround for systems without a real-time clock; see also
353
Debian bug #894495: <https://bugs.debian.org/894495> */
356
time_t currtime = time(NULL);
357
if(currtime != (time_t)-1){
359
if(gmtime_r(&currtime, &tm) == NULL) {
360
perror_plus("gmtime_r");
363
if(tm.tm_year != 70 or tm.tm_mon != 0){
367
fprintf_plus(stderr, "System clock is January 1970");
371
fprintf_plus(stderr, "System clock is invalid");
376
ret = fstat(fd, &keystat);
378
perror_plus("fstat");
381
ret = raise_privileges();
384
perror_plus("Failed to raise privileges");
389
"Setting system clock to key file mtime");
391
time_t keytime = keystat.st_mtim.tv_sec;
392
if(stime(&keytime) != 0){
393
perror_plus("stime");
395
ret = lower_privileges();
398
perror_plus("Failed to lower privileges");
252
402
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
403
if(rc != GPG_ERR_NO_ERROR){
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
404
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
259
rc = gpgme_op_import(mc.ctx, pgp_data);
409
rc = gpgme_op_import(mc->ctx, pgp_data);
260
410
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
411
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
412
gpgme_strsource(rc), gpgme_strerror(rc));
416
gpgme_import_result_t import_result
417
= gpgme_op_import_result(mc->ctx);
418
if((import_result->imported < 1
419
or import_result->not_imported > 0)
420
and import_result->unchanged == 0){
421
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
423
"The total number of considered keys: %d\n",
424
import_result->considered);
426
"The number of keys without user ID: %d\n",
427
import_result->no_user_id);
429
"The total number of imported keys: %d\n",
430
import_result->imported);
431
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
432
import_result->imported_rsa);
433
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
434
import_result->unchanged);
435
fprintf_plus(stderr, "The number of new user IDs: %d\n",
436
import_result->new_user_ids);
437
fprintf_plus(stderr, "The number of new sub keys: %d\n",
438
import_result->new_sub_keys);
439
fprintf_plus(stderr, "The number of new signatures: %d\n",
440
import_result->new_signatures);
441
fprintf_plus(stderr, "The number of new revocations: %d\n",
442
import_result->new_revocations);
444
"The total number of secret keys read: %d\n",
445
import_result->secret_read);
447
"The number of imported secret keys: %d\n",
448
import_result->secret_imported);
450
"The number of unchanged secret keys: %d\n",
451
import_result->secret_unchanged);
452
fprintf_plus(stderr, "The number of keys not imported: %d\n",
453
import_result->not_imported);
454
for(gpgme_import_status_t import_status
455
= import_result->imports;
456
import_status != NULL;
457
import_status = import_status->next){
458
fprintf_plus(stderr, "Import status for key: %s\n",
460
if(import_status->result != GPG_ERR_NO_ERROR){
461
fprintf_plus(stderr, "Import result: %s: %s\n",
462
gpgme_strsource(import_status->result),
463
gpgme_strerror(import_status->result));
465
fprintf_plus(stderr, "Key status:\n");
467
import_status->status & GPGME_IMPORT_NEW
468
? "The key was new.\n"
469
: "The key was not new.\n");
471
import_status->status & GPGME_IMPORT_UID
472
? "The key contained new user IDs.\n"
473
: "The key did not contain new user IDs.\n");
475
import_status->status & GPGME_IMPORT_SIG
476
? "The key contained new signatures.\n"
477
: "The key did not contain new signatures.\n");
479
import_status->status & GPGME_IMPORT_SUBKEY
480
? "The key contained new sub keys.\n"
481
: "The key did not contain new sub keys.\n");
483
import_status->status & GPGME_IMPORT_SECRET
484
? "The key contained a secret key.\n"
485
: "The key did not contain a secret key.\n");
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
268
493
perror_plus("close");
333
561
ssize_t plaintext_length = 0;
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
564
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
339
567
/* Create new GPGME data buffer from memory cryptotext */
340
568
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
342
570
if(rc != GPG_ERR_NO_ERROR){
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
571
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
572
gpgme_strsource(rc), gpgme_strerror(rc));
348
576
/* Create new empty GPGME data buffer for the plaintext */
349
577
rc = gpgme_data_new(&dh_plain);
350
578
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
579
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
580
gpgme_strsource(rc), gpgme_strerror(rc));
353
581
gpgme_data_release(dh_crypto);
357
585
/* Decrypt data from the cryptotext data buffer to the plaintext
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
587
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
360
588
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
589
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
590
gpgme_strsource(rc), gpgme_strerror(rc));
363
591
plaintext_length = -1;
365
593
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
594
result = gpgme_op_decrypt_result(mc->ctx);
367
595
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
596
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
598
if(result->unsupported_algorithm != NULL) {
599
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
600
result->unsupported_algorithm);
602
fprintf_plus(stderr, "Wrong key usage: %s\n",
603
result->wrong_key_usage ? "Yes" : "No");
374
604
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
605
fprintf_plus(stderr, "File name: %s\n", result->file_name);
377
gpgme_recipient_t recipient;
378
recipient = result->recipients;
379
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
386
recipient = recipient->next;
608
for(gpgme_recipient_t r = result->recipients; r != NULL;
610
fprintf_plus(stderr, "Public key algorithm: %s\n",
611
gpgme_pubkey_algo_name(r->pubkey_algo));
612
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
613
fprintf_plus(stderr, "Secret key available: %s\n",
614
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
445
673
return plaintext_length;
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
676
__attribute__((warn_unused_result, const))
677
static const char *safe_string(const char *str){
683
__attribute__((warn_unused_result))
684
static const char *safer_gnutls_strerror(int value){
685
const char *ret = gnutls_strerror(value);
686
return safe_string(ret);
456
689
/* GnuTLS log function callback */
690
__attribute__((nonnull))
457
691
static void debuggnutls(__attribute__((unused)) int level,
458
692
const char* string){
459
fprintf(stderr, "GnuTLS: %s", string);
693
fprintf_plus(stderr, "GnuTLS: %s", string);
696
__attribute__((nonnull(1, 2, 4), warn_unused_result))
462
697
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
698
const char *seckeyfilename,
699
const char *dhparamsfilename,
467
fprintf(stderr, "Initializing GnuTLS\n");
470
ret = gnutls_global_init();
471
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
705
fprintf_plus(stderr, "Initializing GnuTLS\n");
485
716
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
717
ret = gnutls_certificate_allocate_credentials(&mc->cred);
487
718
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
490
gnutls_global_deinit();
719
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
720
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
725
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
726
" secret key %s as GnuTLS credentials\n",
500
731
ret = gnutls_certificate_set_openpgp_key_file
501
(mc.cred, pubkeyfilename, seckeyfilename,
732
(mc->cred, pubkeyfilename, seckeyfilename,
502
733
GNUTLS_OPENPGP_FMT_BASE64);
503
734
if(ret != GNUTLS_E_SUCCESS){
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
736
"Error[%d] while reading the OpenPGP key pair ('%s',"
737
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
738
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
739
safer_gnutls_strerror(ret));
512
743
/* GnuTLS server initialization */
513
ret = gnutls_dh_params_init(&mc.dh_params);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
744
ret = gnutls_dh_params_init(&mc->dh_params);
745
if(ret != GNUTLS_E_SUCCESS){
746
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
747
" initialization: %s\n",
748
safer_gnutls_strerror(ret));
751
/* If a Diffie-Hellman parameters file was given, try to use it */
752
if(dhparamsfilename != NULL){
753
gnutls_datum_t params = { .data = NULL, .size = 0 };
755
int dhpfile = open(dhparamsfilename, O_RDONLY);
758
dhparamsfilename = NULL;
761
size_t params_capacity = 0;
763
params_capacity = incbuffer((char **)¶ms.data,
765
(size_t)params_capacity);
766
if(params_capacity == 0){
767
perror_plus("incbuffer");
770
dhparamsfilename = NULL;
773
ssize_t bytes_read = read(dhpfile,
774
params.data + params.size,
780
/* check bytes_read for failure */
785
dhparamsfilename = NULL;
788
params.size += (unsigned int)bytes_read;
790
ret = close(dhpfile);
792
perror_plus("close");
794
if(params.data == NULL){
795
dhparamsfilename = NULL;
797
if(dhparamsfilename == NULL){
800
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
801
GNUTLS_X509_FMT_PEM);
802
if(ret != GNUTLS_E_SUCCESS){
803
fprintf_plus(stderr, "Failed to parse DH parameters in file"
804
" \"%s\": %s\n", dhparamsfilename,
805
safer_gnutls_strerror(ret));
806
dhparamsfilename = NULL;
811
if(dhparamsfilename == NULL){
812
if(mc->dh_bits == 0){
813
/* Find out the optimal number of DH bits */
814
/* Try to read the private key file */
815
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
817
int secfile = open(seckeyfilename, O_RDONLY);
822
size_t buffer_capacity = 0;
824
buffer_capacity = incbuffer((char **)&buffer.data,
826
(size_t)buffer_capacity);
827
if(buffer_capacity == 0){
828
perror_plus("incbuffer");
833
ssize_t bytes_read = read(secfile,
834
buffer.data + buffer.size,
840
/* check bytes_read for failure */
847
buffer.size += (unsigned int)bytes_read;
851
/* If successful, use buffer to parse private key */
852
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
853
if(buffer.data != NULL){
855
gnutls_openpgp_privkey_t privkey = NULL;
856
ret = gnutls_openpgp_privkey_init(&privkey);
857
if(ret != GNUTLS_E_SUCCESS){
858
fprintf_plus(stderr, "Error initializing OpenPGP key"
860
safer_gnutls_strerror(ret));
864
ret = gnutls_openpgp_privkey_import
865
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
866
if(ret != GNUTLS_E_SUCCESS){
867
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
868
safer_gnutls_strerror(ret));
874
/* Use private key to suggest an appropriate
876
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
877
gnutls_openpgp_privkey_deinit(privkey);
879
fprintf_plus(stderr, "This OpenPGP key implies using"
880
" a GnuTLS security parameter \"%s\".\n",
881
safe_string(gnutls_sec_param_get_name
887
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
888
/* Err on the side of caution */
889
sec_param = GNUTLS_SEC_PARAM_ULTRA;
891
fprintf_plus(stderr, "Falling back to security parameter"
893
safe_string(gnutls_sec_param_get_name
898
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
902
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
903
" implies %u DH bits; using that.\n",
904
safe_string(gnutls_sec_param_get_name
909
fprintf_plus(stderr, "Failed to get implied number of DH"
910
" bits for security parameter \"%s\"): %s\n",
911
safe_string(gnutls_sec_param_get_name
913
safer_gnutls_strerror(ret));
917
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
920
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
921
if(ret != GNUTLS_E_SUCCESS){
922
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
923
" bits): %s\n", mc->dh_bits,
924
safer_gnutls_strerror(ret));
928
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
532
gnutls_certificate_free_credentials(mc.cred);
533
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
934
gnutls_certificate_free_credentials(mc->cred);
935
gnutls_dh_params_deinit(mc->dh_params);
538
static int init_gnutls_session(gnutls_session_t *session){
939
__attribute__((nonnull, warn_unused_result))
940
static int init_gnutls_session(gnutls_session_t *session,
540
943
/* GnuTLS session creation */
594
996
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
595
997
__attribute__((unused)) const char *txt){}
999
/* Helper function to add_local_route() and delete_local_route() */
1000
__attribute__((nonnull, warn_unused_result))
1001
static bool add_delete_local_route(const bool add,
1002
const char *address,
1003
AvahiIfIndex if_index){
1005
char helper[] = "mandos-client-iprouteadddel";
1006
char add_arg[] = "add";
1007
char delete_arg[] = "delete";
1008
char debug_flag[] = "--debug";
1009
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1010
if(pluginhelperdir == NULL){
1012
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1013
" variable not set; cannot run helper\n");
1018
char interface[IF_NAMESIZE];
1019
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1020
perror_plus("if_indextoname");
1024
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1026
perror_plus("open(\"/dev/null\", O_RDONLY)");
1032
/* Raise privileges */
1033
errno = raise_privileges_permanently();
1035
perror_plus("Failed to raise privileges");
1036
/* _exit(EX_NOPERM); */
1042
perror_plus("setgid");
1045
/* Reset supplementary groups */
1047
ret = setgroups(0, NULL);
1049
perror_plus("setgroups");
1053
ret = dup2(devnull, STDIN_FILENO);
1055
perror_plus("dup2(devnull, STDIN_FILENO)");
1058
ret = close(devnull);
1060
perror_plus("close");
1063
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1065
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1068
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1073
if(helperdir_fd == -1){
1074
perror_plus("open");
1075
_exit(EX_UNAVAILABLE);
1077
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1079
if(helper_fd == -1){
1080
perror_plus("openat");
1081
close(helperdir_fd);
1082
_exit(EX_UNAVAILABLE);
1084
close(helperdir_fd);
1086
#pragma GCC diagnostic push
1087
#pragma GCC diagnostic ignored "-Wcast-qual"
1089
if(fexecve(helper_fd, (char *const [])
1090
{ helper, add ? add_arg : delete_arg, (char *)address,
1091
interface, debug ? debug_flag : NULL, NULL },
1094
#pragma GCC diagnostic pop
1096
perror_plus("fexecve");
1097
_exit(EXIT_FAILURE);
1101
perror_plus("fork");
1108
pret = waitpid(pid, &status, 0);
1109
if(pret == -1 and errno == EINTR and quit_now){
1110
int errno_raising = 0;
1111
if((errno = raise_privileges()) != 0){
1112
errno_raising = errno;
1113
perror_plus("Failed to raise privileges in order to"
1114
" kill helper program");
1116
if(kill(pid, SIGTERM) == -1){
1117
perror_plus("kill");
1119
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1120
perror_plus("Failed to lower privileges after killing"
1125
} while(pret == -1 and errno == EINTR);
1127
perror_plus("waitpid");
1130
if(WIFEXITED(status)){
1131
if(WEXITSTATUS(status) != 0){
1132
fprintf_plus(stderr, "Error: iprouteadddel exited"
1133
" with status %d\n", WEXITSTATUS(status));
1138
if(WIFSIGNALED(status)){
1139
fprintf_plus(stderr, "Error: iprouteadddel died by"
1140
" signal %d\n", WTERMSIG(status));
1143
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1147
__attribute__((nonnull, warn_unused_result))
1148
static bool add_local_route(const char *address,
1149
AvahiIfIndex if_index){
1151
fprintf_plus(stderr, "Adding route to %s\n", address);
1153
return add_delete_local_route(true, address, if_index);
1156
__attribute__((nonnull, warn_unused_result))
1157
static bool delete_local_route(const char *address,
1158
AvahiIfIndex if_index){
1160
fprintf_plus(stderr, "Removing route to %s\n", address);
1162
return add_delete_local_route(false, address, if_index);
597
1165
/* Called when a Mandos server is found */
598
static int start_mandos_communication(const char *ip, uint16_t port,
1166
__attribute__((nonnull, warn_unused_result))
1167
static int start_mandos_communication(const char *ip, in_port_t port,
599
1168
AvahiIfIndex if_index,
1169
int af, mandos_context *mc){
601
1170
int ret, tcp_sd = -1;
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
1172
struct sockaddr_storage to;
607
1173
char *buffer = NULL;
608
1174
char *decrypted_buffer = NULL;
609
1175
size_t buffer_length = 0;
631
fprintf(stderr, "Bad address family: %d\n", af);
1198
fprintf_plus(stderr, "Bad address family: %d\n", af);
636
ret = init_gnutls_session(&session);
1203
/* If the interface is specified and we have a list of interfaces */
1204
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1205
/* Check if the interface is one of the interfaces we are using */
1208
char *interface = NULL;
1209
while((interface = argz_next(mc->interfaces,
1210
mc->interfaces_size,
1212
if(if_nametoindex(interface) == (unsigned int)if_index){
1219
/* This interface does not match any in the list, so we don't
1220
connect to the server */
1222
char interface[IF_NAMESIZE];
1223
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1224
perror_plus("if_indextoname");
1226
fprintf_plus(stderr, "Skipping server on non-used interface"
1228
if_indextoname((unsigned int)if_index,
1236
ret = init_gnutls_session(&session, mc);
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
1242
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1243
PRIuMAX "\n", ip, (uintmax_t)port);
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
1246
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
649
1249
perror_plus("socket");
710
1305
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
1306
perror_plus("if_indextoname");
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
1308
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1309
"\n", ip, interface, (uintmax_t)port);
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1312
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1313
ip, (uintmax_t)port);
720
1315
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
1316
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
731
perror_plus("inet_ntop");
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
752
perror_plus("connect");
1318
ret = getnameinfo((struct sockaddr *)&to,
1319
sizeof(struct sockaddr_in6),
1320
addrstr, sizeof(addrstr), NULL, 0,
1323
ret = getnameinfo((struct sockaddr *)&to,
1324
sizeof(struct sockaddr_in),
1325
addrstr, sizeof(addrstr), NULL, 0,
1328
if(ret == EAI_SYSTEM){
1329
perror_plus("getnameinfo");
1330
} else if(ret != 0) {
1331
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1332
} else if(strcmp(addrstr, ip) != 0){
1333
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1344
ret = connect(tcp_sd, (struct sockaddr *)&to,
1345
sizeof(struct sockaddr_in6));
1347
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1348
sizeof(struct sockaddr_in));
1351
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1352
and if_index != AVAHI_IF_UNSPEC
1353
and connect_to == NULL
1354
and not route_added and
1355
((af == AF_INET6 and not
1356
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1358
or (af == AF_INET and
1359
/* Not a a IPv4LL address */
1360
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1361
& 0xFFFF0000L) != 0xA9FE0000L))){
1362
/* Work around Avahi bug - Avahi does not announce link-local
1363
addresses if it has a global address, so local hosts with
1364
*only* a link-local address (e.g. Mandos clients) cannot
1365
connect to a Mandos server announced by Avahi on a server
1366
host with a global address. Work around this by retrying
1367
with an explicit route added with the server's address.
1369
Avahi bug reference:
1370
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1371
https://bugs.debian.org/587961
1374
fprintf_plus(stderr, "Mandos server unreachable, trying"
1378
route_added = add_local_route(ip, if_index);
1384
if(errno != ECONNREFUSED or debug){
1386
perror_plus("connect");
763
1399
const char *out = mandos_protocol_version;
1001
1662
char ip[AVAHI_ADDRESS_STR_MAX];
1002
1663
avahi_address_snprint(ip, sizeof(ip), address);
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1665
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1666
PRIdMAX ") on port %" PRIu16 "\n", name,
1667
host_name, ip, (intmax_t)interface, port);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1669
int ret = start_mandos_communication(ip, (in_port_t)port,
1671
avahi_proto_to_af(proto),
1011
avahi_simple_poll_quit(mc.simple_poll);
1674
avahi_simple_poll_quit(simple_poll);
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1676
if(not add_server(ip, (in_port_t)port, interface,
1677
avahi_proto_to_af(proto),
1678
&((mandos_context*)mc)->current_server)){
1679
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1080
1754
signal_received = sig;
1081
1755
int old_errno = errno;
1082
1756
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1757
if(simple_poll != NULL){
1758
avahi_simple_poll_quit(simple_poll);
1086
1760
errno = old_errno;
1763
__attribute__((nonnull, warn_unused_result))
1089
1764
bool get_flags(const char *ifname, struct ifreq *ifr){
1092
1768
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1094
1771
perror_plus("socket");
1097
strcpy(ifr->ifr_name, ifname);
1775
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1776
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1098
1777
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1101
1781
perror_plus("ioctl SIOCGIFFLAGS");
1784
if((close(s) == -1) and debug){
1786
perror_plus("close");
1791
if((close(s) == -1) and debug){
1793
perror_plus("close");
1799
__attribute__((nonnull, warn_unused_result))
1108
1800
bool good_flags(const char *ifname, const struct ifreq *ifr){
1110
1802
/* Reject the loopback device */
1111
1803
if(ifr->ifr_flags & IFF_LOOPBACK){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1805
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1118
1810
/* Accept point-to-point devices only if connect_to is specified */
1119
1811
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1813
fprintf_plus(stderr, "Accepting point-to-point interface"
1814
" \"%s\"\n", ifname);
1126
1818
/* Otherwise, reject non-broadcast-capable devices */
1127
1819
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1821
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1822
" \"%s\"\n", ifname);
1134
1826
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
1827
if(ifr->ifr_flags & IFF_NOARP){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1829
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1142
1835
/* Accept this device */
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1837
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device which is up.
1174
* (This function is passed to scandir(3) as a filter function.)
1176
int up_interface(const struct dirent *if_entry){
1178
char *flagname = NULL;
1179
if(if_entry->d_name[0] == '.'){
1182
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1185
perror_plus("asprintf");
1188
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1190
perror_plus("open");
1195
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1196
/* read line from flags_fd */
1197
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1198
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1199
flagstring[(size_t)to_read] = '\0';
1200
if(flagstring == NULL){
1201
perror_plus("malloc");
1206
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1209
perror_plus("read");
1223
tmpmax = strtoimax(flagstring, &tmp, 0);
1224
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1225
and not (isspace(*tmp)))
1226
or tmpmax != (ifreq_flags)tmpmax){
1228
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1229
flagstring, if_entry->d_name);
1235
ifreq_flags flags = (ifreq_flags)tmpmax;
1236
/* Reject the loopback device */
1237
if(flags & IFF_LOOPBACK){
1239
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1245
/* Reject down interfaces */
1246
if(not (flags & IFF_UP)){
1250
/* Accept point-to-point devices only if connect_to is specified */
1251
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1253
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1258
/* Otherwise, reject non-broadcast-capable devices */
1259
if(not (flags & IFF_BROADCAST)){
1261
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1266
/* Reject non-ARP interfaces (including dummy interfaces) */
1267
if(flags & IFF_NOARP){
1269
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1274
/* Accept this device */
1276
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1869
* This function determines if a network interface is up.
1871
__attribute__((nonnull, warn_unused_result))
1872
bool interface_is_up(const char *interface){
1874
if(not get_flags(interface, &ifr)){
1876
fprintf_plus(stderr, "Failed to get flags for interface "
1877
"\"%s\"\n", interface);
1882
return (bool)(ifr.ifr_flags & IFF_UP);
1886
* This function determines if a network interface is running
1888
__attribute__((nonnull, warn_unused_result))
1889
bool interface_is_running(const char *interface){
1891
if(not get_flags(interface, &ifr)){
1893
fprintf_plus(stderr, "Failed to get flags for interface "
1894
"\"%s\"\n", interface);
1899
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1902
__attribute__((nonnull, pure, warn_unused_result))
1282
1903
int notdotentries(const struct dirent *direntry){
1283
1904
/* Skip "." and ".." */
1284
1905
if(direntry->d_name[0] == '.'
1303
/* Save pointer to last character */
1304
char *end = strchr(direntry->d_name, '\0')-1;
1311
if(((direntry->d_name)[0] == '#')
1313
/* Temporary #name# */
1317
/* XXX more rules here */
1319
ret = stat(direntry->d_name, &st);
1926
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1927
"abcdefghijklmnopqrstuvwxyz"
1930
if((direntry->d_name)[sret] != '\0'){
1931
/* Contains non-allowed characters */
1933
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1939
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1322
perror_plus("Could not stat plugin");
1942
perror_plus("Could not stat hook");
1326
if(not (st.st_mode & S_ISREG)){
1946
if(not (S_ISREG(st.st_mode))){
1327
1947
/* Not a regular file */
1949
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1330
1954
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1331
1955
/* Not executable */
1957
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1963
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1337
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1969
__attribute__((nonnull, warn_unused_result))
1970
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1971
mandos_context *mc){
1339
1973
struct timespec now;
1340
1974
struct timespec waited_time;
1341
1975
intmax_t block_time;
1344
if(mc.current_server == NULL){
1347
"Wait until first server is found. No timeout!\n");
1978
if(mc->current_server == NULL){
1980
fprintf_plus(stderr, "Wait until first server is found."
1349
1983
ret = avahi_simple_poll_iterate(s, -1);
1352
fprintf(stderr, "Check current_server if we should run it,"
1986
fprintf_plus(stderr, "Check current_server if we should run"
1355
1989
/* the current time */
1356
1990
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1398
2033
ret = avahi_simple_poll_iterate(s, (int)block_time);
1401
if (ret > 0 or errno != EINTR) {
2036
if(ret > 0 or errno != EINTR){
1402
2037
return (ret != 1) ? ret : 0;
2043
__attribute__((nonnull))
2044
void run_network_hooks(const char *mode, const char *interface,
2046
struct dirent **direntries = NULL;
2047
if(hookdir_fd == -1){
2048
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2050
if(hookdir_fd == -1){
2051
if(errno == ENOENT){
2053
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2054
" found\n", hookdir);
2057
perror_plus("open");
2062
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2064
perror_plus("open(\"/dev/null\", O_RDONLY)");
2067
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2068
runnable_hook, alphasort);
2070
perror_plus("scandir");
2074
struct dirent *direntry;
2076
for(int i = 0; i < numhooks; i++){
2077
direntry = direntries[i];
2079
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2082
pid_t hook_pid = fork();
2085
/* Raise privileges */
2086
errno = raise_privileges_permanently();
2088
perror_plus("Failed to raise privileges");
2095
perror_plus("setgid");
2098
/* Reset supplementary groups */
2100
ret = setgroups(0, NULL);
2102
perror_plus("setgroups");
2105
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2107
perror_plus("setenv");
2110
ret = setenv("DEVICE", interface, 1);
2112
perror_plus("setenv");
2115
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2117
perror_plus("setenv");
2120
ret = setenv("MODE", mode, 1);
2122
perror_plus("setenv");
2126
ret = asprintf(&delaystring, "%f", (double)delay);
2128
perror_plus("asprintf");
2131
ret = setenv("DELAY", delaystring, 1);
2134
perror_plus("setenv");
2138
if(connect_to != NULL){
2139
ret = setenv("CONNECT", connect_to, 1);
2141
perror_plus("setenv");
2145
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2149
perror_plus("openat");
2150
_exit(EXIT_FAILURE);
2152
if(close(hookdir_fd) == -1){
2153
perror_plus("close");
2154
_exit(EXIT_FAILURE);
2156
ret = dup2(devnull, STDIN_FILENO);
2158
perror_plus("dup2(devnull, STDIN_FILENO)");
2161
ret = close(devnull);
2163
perror_plus("close");
2166
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2168
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2171
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2173
perror_plus("fexecve");
2174
_exit(EXIT_FAILURE);
2178
perror_plus("fork");
2183
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2184
perror_plus("waitpid");
2188
if(WIFEXITED(status)){
2189
if(WEXITSTATUS(status) != 0){
2190
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2191
" with status %d\n", direntry->d_name,
2192
WEXITSTATUS(status));
2196
} else if(WIFSIGNALED(status)){
2197
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2198
" signal %d\n", direntry->d_name,
2203
fprintf_plus(stderr, "Warning: network hook \"%s\""
2204
" crashed\n", direntry->d_name);
2210
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2216
if(close(hookdir_fd) == -1){
2217
perror_plus("close");
2224
__attribute__((nonnull, warn_unused_result))
2225
int bring_up_interface(const char *const interface,
2227
int old_errno = errno;
2229
struct ifreq network;
2230
unsigned int if_index = if_nametoindex(interface);
2232
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2242
if(not interface_is_up(interface)){
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network)){
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2252
network.ifr_flags |= IFF_UP; /* set flag */
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2257
perror_plus("socket");
2265
perror_plus("close");
2272
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2276
/* Raise privileges */
2277
ret_errno = raise_privileges();
2280
perror_plus("Failed to raise privileges");
2285
bool restore_loglevel = false;
2287
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2288
messages about the network interface to mess up the prompt */
2289
ret_linux = klogctl(8, NULL, 5);
2290
if(ret_linux == -1){
2291
perror_plus("klogctl");
2293
restore_loglevel = true;
2296
#endif /* __linux__ */
2297
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2298
ioctl_errno = errno;
2300
if(restore_loglevel){
2301
ret_linux = klogctl(7, NULL, 0);
2302
if(ret_linux == -1){
2303
perror_plus("klogctl");
2306
#endif /* __linux__ */
2308
/* If raise_privileges() succeeded above */
2310
/* Lower privileges */
2311
ret_errno = lower_privileges();
2314
perror_plus("Failed to lower privileges");
2318
/* Close the socket */
2321
perror_plus("close");
2324
if(ret_setflags == -1){
2325
errno = ioctl_errno;
2326
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2331
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2335
/* Sleep checking until interface is running.
2336
Check every 0.25s, up to total time of delay */
2337
for(int i = 0; i < delay * 4; i++){
2338
if(interface_is_running(interface)){
2341
struct timespec sleeptime = { .tv_nsec = 250000000 };
2342
ret = nanosleep(&sleeptime, NULL);
2343
if(ret == -1 and errno != EINTR){
2344
perror_plus("nanosleep");
2352
__attribute__((nonnull, warn_unused_result))
2353
int take_down_interface(const char *const interface){
2354
int old_errno = errno;
2355
struct ifreq network;
2356
unsigned int if_index = if_nametoindex(interface);
2358
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2362
if(interface_is_up(interface)){
2364
int ioctl_errno = 0;
2365
if(not get_flags(interface, &network) and debug){
2367
fprintf_plus(stderr, "Failed to get flags for interface "
2368
"\"%s\"\n", interface);
2372
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2374
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2377
perror_plus("socket");
2383
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2387
/* Raise privileges */
2388
ret_errno = raise_privileges();
2391
perror_plus("Failed to raise privileges");
2394
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2395
ioctl_errno = errno;
2397
/* If raise_privileges() succeeded above */
2399
/* Lower privileges */
2400
ret_errno = lower_privileges();
2403
perror_plus("Failed to lower privileges");
2407
/* Close the socket */
2408
int ret = close(sd);
2410
perror_plus("close");
2413
if(ret_setflags == -1){
2414
errno = ioctl_errno;
2415
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2420
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1408
2428
int main(int argc, char *argv[]){
2429
mandos_context mc = { .server = NULL, .dh_bits = 0,
2430
.priority = "SECURE256:!CTYPE-X.509"
2431
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2432
.current_server = NULL, .interfaces = NULL,
2433
.interfaces_size = 0 };
1409
2434
AvahiSServiceBrowser *sb = NULL;
1412
2437
intmax_t tmpmax;
1414
2439
int exitcode = EXIT_SUCCESS;
1415
const char *interface = "";
1416
struct ifreq network;
1418
bool take_down_interface = false;
1421
char tempdir[] = "/tmp/mandosXXXXXX";
1422
bool tempdir_created = false;
2440
char *interfaces_to_take_down = NULL;
2441
size_t interfaces_to_take_down_size = 0;
2442
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2443
char old_tempdir[] = "/tmp/mandosXXXXXX";
2444
char *tempdir = NULL;
1423
2445
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1424
2446
const char *seckey = PATHDIR "/" SECKEY;
1425
2447
const char *pubkey = PATHDIR "/" PUBKEY;
2448
const char *dh_params_file = NULL;
2449
char *interfaces_hooks = NULL;
1427
2451
bool gnutls_initialized = false;
1428
2452
bool gpgme_initialized = false;
1595
2638
/* Work around Debian bug #633582:
1596
<http://bugs.debian.org/633582> */
1599
/* Re-raise priviliges */
1603
perror_plus("seteuid");
1606
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1607
int seckey_fd = open(seckey, O_RDONLY);
1608
if(seckey_fd == -1){
1609
perror_plus("open");
1611
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1613
perror_plus("fstat");
1615
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1616
ret = fchown(seckey_fd, uid, gid);
1618
perror_plus("fchown");
1622
TEMP_FAILURE_RETRY(close(seckey_fd));
1626
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1627
int pubkey_fd = open(pubkey, O_RDONLY);
1628
if(pubkey_fd == -1){
1629
perror_plus("open");
1631
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1633
perror_plus("fstat");
1635
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1636
ret = fchown(pubkey_fd, uid, gid);
1638
perror_plus("fchown");
1642
TEMP_FAILURE_RETRY(close(pubkey_fd));
1646
/* Lower privileges */
1650
perror_plus("seteuid");
1654
/* Find network hooks and run them */
1656
struct dirent **direntries;
1657
struct dirent *direntry;
1658
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[0];
1663
char *fullname = NULL;
1664
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
perror_plus("asprintf");
1670
pid_t hook_pid = fork();
1673
dup2(devnull, STDIN_FILENO);
1675
dup2(STDERR_FILENO, STDOUT_FILENO);
1676
setenv("DEVICE", interface, 1);
1677
setenv("VERBOSE", debug ? "1" : "0", 1);
1678
setenv("MODE", "start", 1);
1679
/* setenv( XXX more here */
1680
ret = execl(fullname, direntry->d_name, "start");
1681
perror_plus("execl");
2639
<https://bugs.debian.org/633582> */
2641
/* Re-raise privileges */
2642
ret = raise_privileges();
2645
perror_plus("Failed to raise privileges");
2649
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2650
int seckey_fd = open(seckey, O_RDONLY);
2651
if(seckey_fd == -1){
2652
perror_plus("open");
2654
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2656
perror_plus("fstat");
2658
if(S_ISREG(st.st_mode)
2659
and st.st_uid == 0 and st.st_gid == 0){
2660
ret = fchown(seckey_fd, uid, gid);
2662
perror_plus("fchown");
2670
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2671
int pubkey_fd = open(pubkey, O_RDONLY);
2672
if(pubkey_fd == -1){
2673
perror_plus("open");
2675
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2677
perror_plus("fstat");
2679
if(S_ISREG(st.st_mode)
2680
and st.st_uid == 0 and st.st_gid == 0){
2681
ret = fchown(pubkey_fd, uid, gid);
2683
perror_plus("fchown");
2691
if(dh_params_file != NULL
2692
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2693
int dhparams_fd = open(dh_params_file, O_RDONLY);
2694
if(dhparams_fd == -1){
2695
perror_plus("open");
2697
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2699
perror_plus("fstat");
2701
if(S_ISREG(st.st_mode)
2702
and st.st_uid == 0 and st.st_gid == 0){
2703
ret = fchown(dhparams_fd, uid, gid);
2705
perror_plus("fchown");
2713
/* Lower privileges */
2714
ret = lower_privileges();
2717
perror_plus("Failed to lower privileges");
2722
/* Remove invalid interface names (except "none") */
2724
char *interface = NULL;
2725
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2727
if(strcmp(interface, "none") != 0
2728
and if_nametoindex(interface) == 0){
2729
if(interface[0] != '\0'){
2730
fprintf_plus(stderr, "Not using nonexisting interface"
2731
" \"%s\"\n", interface);
2733
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2739
/* Run network hooks */
2741
if(mc.interfaces != NULL){
2742
interfaces_hooks = malloc(mc.interfaces_size);
2743
if(interfaces_hooks == NULL){
2744
perror_plus("malloc");
2747
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2748
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2750
run_network_hooks("start", interfaces_hooks != NULL ?
2751
interfaces_hooks : "", delay);
1692
2755
avahi_set_log_function(empty_log);
1695
if(interface[0] == '\0'){
1696
struct dirent **direntries;
1697
ret = scandir(sys_class_net, &direntries, good_interface,
1700
/* Pick the first good interface */
1701
interface = strdup(direntries[0]->d_name);
1703
fprintf(stderr, "Using interface \"%s\"\n", interface);
1705
if(interface == NULL){
1706
perror_plus("malloc");
1708
exitcode = EXIT_FAILURE;
1714
fprintf(stderr, "Could not find a network interface\n");
1715
exitcode = EXIT_FAILURE;
1720
2758
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1721
2759
from the signal handler */
1722
2760
/* Initialize the pseudo-RNG for Avahi */
1723
2761
srand((unsigned int) time(NULL));
1724
mc.simple_poll = avahi_simple_poll_new();
1725
if(mc.simple_poll == NULL){
1726
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2762
simple_poll = avahi_simple_poll_new();
2763
if(simple_poll == NULL){
2764
fprintf_plus(stderr,
2765
"Avahi: Failed to create simple poll object.\n");
1727
2766
exitcode = EX_UNAVAILABLE;
1794
/* If the interface is down, bring it up */
1795
if(strcmp(interface, "none") != 0){
1796
if_index = (AvahiIfIndex) if_nametoindex(interface);
1798
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1799
exitcode = EX_UNAVAILABLE;
1807
/* Re-raise priviliges */
1811
perror_plus("seteuid");
1815
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1816
messages about the network interface to mess up the prompt */
1817
ret = klogctl(8, NULL, 5);
1818
bool restore_loglevel = true;
1820
restore_loglevel = false;
1821
perror_plus("klogctl");
1823
#endif /* __linux__ */
1825
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1827
perror_plus("socket");
1828
exitcode = EX_OSERR;
1830
if(restore_loglevel){
1831
ret = klogctl(7, NULL, 0);
1833
perror_plus("klogctl");
1836
#endif /* __linux__ */
1837
/* Lower privileges */
1841
perror_plus("seteuid");
1845
strcpy(network.ifr_name, interface);
1846
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1848
perror_plus("ioctl SIOCGIFFLAGS");
1850
if(restore_loglevel){
1851
ret = klogctl(7, NULL, 0);
1853
perror_plus("klogctl");
1856
#endif /* __linux__ */
1857
exitcode = EX_OSERR;
1858
/* Lower privileges */
1862
perror_plus("seteuid");
1866
if((network.ifr_flags & IFF_UP) == 0){
1867
network.ifr_flags |= IFF_UP;
1868
take_down_interface = true;
1869
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1871
take_down_interface = false;
1872
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1873
exitcode = EX_OSERR;
1875
if(restore_loglevel){
1876
ret = klogctl(7, NULL, 0);
1878
perror_plus("klogctl");
2833
/* If no interfaces were specified, make a list */
2834
if(mc.interfaces == NULL){
2835
struct dirent **direntries = NULL;
2836
/* Look for any good interfaces */
2837
ret = scandir(sys_class_net, &direntries, good_interface,
2840
/* Add all found interfaces to interfaces list */
2841
for(int i = 0; i < ret; ++i){
2842
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2843
direntries[i]->d_name);
2846
perror_plus("argz_add");
2847
free(direntries[i]);
2851
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2852
direntries[i]->d_name);
2854
free(direntries[i]);
2861
fprintf_plus(stderr, "Could not find a network interface\n");
2862
exitcode = EXIT_FAILURE;
2867
/* Bring up interfaces which are down, and remove any "none"s */
2869
char *interface = NULL;
2870
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2872
/* If interface name is "none", stop bringing up interfaces.
2873
Also remove all instances of "none" from the list */
2874
if(strcmp(interface, "none") == 0){
2875
argz_delete(&mc.interfaces, &mc.interfaces_size,
2878
while((interface = argz_next(mc.interfaces,
2879
mc.interfaces_size, interface))){
2880
if(strcmp(interface, "none") == 0){
2881
argz_delete(&mc.interfaces, &mc.interfaces_size,
1881
#endif /* __linux__ */
1882
/* Lower privileges */
1886
perror_plus("seteuid");
1891
/* Sleep checking until interface is running.
1892
Check every 0.25s, up to total time of delay */
1893
for(int i=0; i < delay * 4; i++){
1894
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1896
perror_plus("ioctl SIOCGIFFLAGS");
1897
} else if(network.ifr_flags & IFF_RUNNING){
1900
struct timespec sleeptime = { .tv_nsec = 250000000 };
1901
ret = nanosleep(&sleeptime, NULL);
1902
if(ret == -1 and errno != EINTR){
1903
perror_plus("nanosleep");
1906
if(not take_down_interface){
1907
/* We won't need the socket anymore */
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1910
perror_plus("close");
1914
if(restore_loglevel){
1915
/* Restores kernel loglevel to default */
1916
ret = klogctl(7, NULL, 0);
1918
perror_plus("klogctl");
1921
#endif /* __linux__ */
1922
/* Lower privileges */
1924
if(take_down_interface){
1925
/* Lower privileges */
1928
perror_plus("seteuid");
1931
/* Lower privileges permanently */
1934
perror_plus("setuid");
2888
bool interface_was_up = interface_is_up(interface);
2889
errno = bring_up_interface(interface, delay);
2890
if(not interface_was_up){
2892
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2893
" %s\n", interface, strerror(errno));
2895
errno = argz_add(&interfaces_to_take_down,
2896
&interfaces_to_take_down_size,
2899
perror_plus("argz_add");
2904
if(debug and (interfaces_to_take_down == NULL)){
2905
fprintf_plus(stderr, "No interfaces were brought up\n");
2909
/* If we only got one interface, explicitly use only that one */
2910
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2912
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2915
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1943
ret = init_gnutls_global(pubkey, seckey);
2922
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1945
fprintf(stderr, "init_gnutls_global failed\n");
2924
fprintf_plus(stderr, "init_gnutls_global failed\n");
1946
2925
exitcode = EX_UNAVAILABLE;
2095
3084
/* Run the main loop */
2098
fprintf(stderr, "Starting Avahi loop search\n");
3087
fprintf_plus(stderr, "Starting Avahi loop search\n");
2101
ret = avahi_loop_with_timeout(mc.simple_poll,
2102
(int)(retry_interval * 1000));
3090
ret = avahi_loop_with_timeout(simple_poll,
3091
(int)(retry_interval * 1000), &mc);
2104
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2105
(ret == 0) ? "successfully" : "with error");
3093
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3094
(ret == 0) ? "successfully" : "with error");
2111
fprintf(stderr, "%s exiting\n", argv[0]);
3100
if(signal_received){
3101
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3102
argv[0], signal_received,
3103
strsignal(signal_received));
3105
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2114
3109
/* Cleanup things */
3110
free(mc.interfaces);
2116
3113
avahi_s_service_browser_free(sb);
2118
3115
if(mc.server != NULL)
2119
3116
avahi_server_free(mc.server);
2121
if(mc.simple_poll != NULL)
2122
avahi_simple_poll_free(mc.simple_poll);
3118
if(simple_poll != NULL)
3119
avahi_simple_poll_free(simple_poll);
2124
3121
if(gnutls_initialized){
2125
3122
gnutls_certificate_free_credentials(mc.cred);
2126
gnutls_global_deinit();
2127
3123
gnutls_dh_params_deinit(mc.dh_params);
2130
3126
if(gpgme_initialized){
2131
3127
gpgme_release(mc.ctx);
2134
3130
/* Cleans up the circular linked list of Mandos servers the client
2136
3132
if(mc.current_server != NULL){
2137
3133
mc.current_server->prev->next = NULL;
2138
3134
while(mc.current_server != NULL){
2139
3135
server *next = mc.current_server->next;
3137
#pragma GCC diagnostic push
3138
#pragma GCC diagnostic ignored "-Wcast-qual"
3140
free((char *)(mc.current_server->ip));
3142
#pragma GCC diagnostic pop
2140
3144
free(mc.current_server);
2141
3145
mc.current_server = next;
2145
/* XXX run network hooks "stop" here */
2147
/* Take down the network interface */
2148
if(take_down_interface){
2149
/* Re-raise priviliges */
2153
perror_plus("seteuid");
2156
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2158
perror_plus("ioctl SIOCGIFFLAGS");
2159
} else if(network.ifr_flags & IFF_UP) {
2160
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2161
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2163
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2166
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2168
perror_plus("close");
2170
/* Lower privileges permanently */
2174
perror_plus("setuid");
3149
/* Re-raise privileges */
3151
ret = raise_privileges();
3154
perror_plus("Failed to raise privileges");
3157
/* Run network hooks */
3158
run_network_hooks("stop", interfaces_hooks != NULL ?
3159
interfaces_hooks : "", delay);
3161
/* Take down the network interfaces which were brought up */
3163
char *interface = NULL;
3164
while((interface = argz_next(interfaces_to_take_down,
3165
interfaces_to_take_down_size,
3167
ret = take_down_interface(interface);
3170
perror_plus("Failed to take down interface");
3173
if(debug and (interfaces_to_take_down == NULL)){
3174
fprintf_plus(stderr, "No interfaces needed to be taken"
3180
ret = lower_privileges_permanently();
3183
perror_plus("Failed to lower privileges permanently");
3187
free(interfaces_to_take_down);
3188
free(interfaces_hooks);
3190
void clean_dir_at(int base, const char * const dirname,
3192
struct dirent **direntries = NULL;
3194
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3200
perror_plus("open");
3203
int numentries = scandirat(dir_fd, ".", &direntries,
3204
notdotentries, alphasort);
3205
if(numentries >= 0){
3206
for(int i = 0; i < numentries; i++){
3208
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3209
dirname, direntries[i]->d_name);
3211
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3213
if(errno == EISDIR){
3214
dret = unlinkat(dir_fd, direntries[i]->d_name,
3217
if((dret == -1) and (errno == ENOTEMPTY)
3218
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3219
== 0) and (level == 0)){
3220
/* Recurse only in this special case */
3221
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3224
if((dret == -1) and (errno != ENOENT)){
3225
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3226
direntries[i]->d_name, strerror(errno));
3229
free(direntries[i]);
3232
/* need to clean even if 0 because man page doesn't specify */
3234
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3235
if(dret == -1 and errno != ENOENT){
3236
perror_plus("rmdir");
3239
perror_plus("scandirat");
2179
3244
/* Removes the GPGME temp directory and all files inside */
2180
if(tempdir_created){
2181
struct dirent **direntries = NULL;
2182
struct dirent *direntry = NULL;
2183
int numentries = scandir(tempdir, &direntries, notdotentries,
2185
if (numentries > 0){
2186
for(int i = 0; i < numentries; i++){
2187
direntry = direntries[i];
2188
char *fullname = NULL;
2189
ret = asprintf(&fullname, "%s/%s", tempdir,
2192
perror_plus("asprintf");
2195
ret = remove(fullname);
2197
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2204
/* need to clean even if 0 because man page doesn't specify */
2206
if (numentries == -1){
2207
perror_plus("scandir");
2209
ret = rmdir(tempdir);
2210
if(ret == -1 and errno != ENOENT){
2211
perror_plus("rmdir");
3245
if(tempdir != NULL){
3246
clean_dir_at(-1, tempdir, 0);