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237.7.318
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-12 01:57:54 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150712015754-1lq7u2ejo7fdyfvi
* debian/mandos.prerm: Don't run init script, use only invoke-rc.d.
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- dracut-module
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2021 Teddy Hogeborn
13
* Copyright © 2008-2021 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
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.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
*
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.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
38
37
#define _FILE_OFFSET_BITS 64
39
38
#endif /* not _FILE_OFFSET_BITS */
40
39
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
#include <argp.h> /* argp_program_version,
46
argp_program_bug_address,
47
struct argp_option,
48
struct argp_state, argp_error(),
49
argp_state_help,
50
ARGP_HELP_STD_HELP,
51
ARGP_HELP_EXIT_ERR,
52
ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
53
argp_err_exit_status,
54
ARGP_ERR_UNKNOWN, struct argp,
55
argp_parse(), ARGP_IN_ORDER,
56
ARGP_NO_HELP */
57
#include <stddef.h> /* NULL, size_t */
58
#include <sys/types.h> /* uid_t, gid_t, sig_atomic_t,
59
seteuid(), setuid(), pid_t,
60
setgid(), getuid(), getgid() */
61
#include <unistd.h> /* uid_t, gid_t, TEMP_FAILURE_RETRY(),
62
seteuid(), setuid(), close(),
63
ssize_t, read(), fork(), setgid(),
64
_exit(), dup2(), STDIN_FILENO,
65
STDERR_FILENO, STDOUT_FILENO,
66
fexecve(), write(), getuid(),
67
getgid(), fchown(), symlink(),
68
sleep(), unlinkat(), pause() */
69
#include <netinet/in.h> /* in_port_t, struct sockaddr_in6,
70
sa_family_t, struct sockaddr_in,
71
htons(), IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN,
73
ntohl(), IPPROTO_IP */
74
#include <time.h> /* struct timespec, clock_gettime(),
75
CLOCK_MONOTONIC, time_t, struct tm,
76
gmtime_r(), clock_settime(),
77
CLOCK_REALTIME, nanosleep() */
78
#include <errno.h> /* errno,
79
program_invocation_short_name,
80
EINTR, EINVAL, ENETUNREACH,
81
EHOSTUNREACH, ECONNREFUSED, EPROTO,
82
EIO, ENOENT, ENXIO, error_t,
83
ENOMEM, EISDIR, ENOTEMPTY */
84
#include <stdio.h> /* fprintf(), stderr, perror(), FILE,
85
vfprintf(), off_t, SEEK_SET,
86
stdout, fwrite(), ferror(),
87
fflush(), asprintf() */
88
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
89
#include <stdlib.h> /* realloc(), free(), malloc(),
90
getenv(), EXIT_FAILURE, setenv(),
91
EXIT_SUCCESS, strtof(), strtod(),
92
srand(), mkdtemp(), abort() */
93
#include <string.h> /* strdup(), strcmp(), strlen(),
94
strerror(), strncpy(), strspn(),
95
memcpy(), strrchr(), strchr(),
96
strsignal() */
97
#include <fcntl.h> /* open(), O_RDONLY, O_DIRECTORY,
98
O_PATH, O_CLOEXEC, openat(),
99
O_NOFOLLOW, AT_REMOVEDIR */
100
#include <iso646.h> /* or, and, not */
101
#include <sys/stat.h> /* struct stat, fstat(), fstatat(),
102
S_ISREG(), S_IXUSR, S_IXGRP,
103
S_IXOTH, lstat() */
104
#include <net/if.h> /* IF_NAMESIZE, if_indextoname(),
105
if_nametoindex(), SIOCGIFFLAGS,
106
IFF_LOOPBACK, IFF_POINTOPOINT,
107
IFF_BROADCAST, IFF_NOARP, IFF_UP,
108
IFF_RUNNING, SIOCSIFFLAGS */
109
#include <sysexits.h> /* EX_NOPERM, EX_OSERR,
110
EX_UNAVAILABLE, EX_USAGE */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
SIOCSIFFLAGS, if_indextoname(),
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
80
#include <argp.h> /* struct argp_option, error_t, struct
81
argp_state, struct argp,
82
argp_parse(), ARGP_KEY_ARG,
83
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
111
91
#include <grp.h> /* setgroups() */
112
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
113
WEXITSTATUS(), WIFSIGNALED(),
114
WTERMSIG() */
115
#include <signal.h> /* kill(), SIGTERM, struct sigaction,
116
SIG_DFL, sigemptyset(),
117
sigaddset(), SIGINT, SIGHUP,
118
SIG_IGN, raise() */
119
#include <sys/socket.h> /* struct sockaddr_storage, AF_INET6,
120
PF_INET6, AF_INET, PF_INET,
121
socket(), SOCK_STREAM,
122
SOCK_CLOEXEC, struct sockaddr,
123
connect(), SOCK_DGRAM */
124
#include <argz.h> /* argz_next(), argz_add_sep(),
125
argz_delete(), argz_stringify(),
126
argz_add(), argz_count() */
127
#include <inttypes.h> /* PRIuMAX, uintmax_t, uint32_t,
128
PRIdMAX, PRIu16, intmax_t,
129
strtoimax() */
130
#include <arpa/inet.h> /* inet_pton() */
131
#include <stdint.h> /* uint32_t, intptr_t, uint16_t */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
132
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
133
97
EAI_SYSTEM, gai_strerror() */
134
#include <sys/ioctl.h> /* ioctl() */
135
#include <dirent.h> /* struct dirent, scandirat(),
136
alphasort(), scandir() */
137
#include <limits.h> /* INT_MAX */
138
98
139
99
#ifdef __linux__
140
100
#include <sys/klog.h> /* klogctl() */
153
113
154
114
/* GnuTLS */
155
115
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
116
functions:
117
gnutls_*
118
init_gnutls_session(),
119
GNUTLS_* */
158
120
#include <gnutls/openpgp.h>
159
121
/* gnutls_certificate_set_openpgp_key_file(),
160
122
GNUTLS_OPENPGP_FMT_BASE64 */
161
#elif GNUTLS_VERSION_NUMBER >= 0x030606
162
#include <gnutls/x509.h> /* GNUTLS_PKCS_PLAIN,
163
GNUTLS_PKCS_NULL_PASSWORD */
164
#endif
165
123
166
124
/* GPGME */
167
125
#include <gpgme.h> /* All GPGME types, constants and
168
126
functions:
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
127
gpgme_*
128
GPGME_PROTOCOL_OpenPGP,
129
GPG_ERR_NO_* */
172
130
173
131
#define BUFFER_SIZE 256
174
132
175
133
#define PATHDIR "/conf/conf.d/mandos"
176
134
#define SECKEY "seckey.txt"
177
135
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
180
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
181
137
182
138
bool debug = false;
310
266
return true;
311
267
}
312
268
313
/* Set effective uid to 0, return errno */
314
__attribute__((warn_unused_result))
315
int raise_privileges(void){
316
int old_errno = errno;
317
int ret = 0;
318
if(seteuid(0) == -1){
319
ret = errno;
320
}
321
errno = old_errno;
322
return ret;
323
}
324
325
/* Set effective and real user ID to 0. Return errno. */
326
__attribute__((warn_unused_result))
327
int raise_privileges_permanently(void){
328
int old_errno = errno;
329
int ret = raise_privileges();
330
if(ret != 0){
331
errno = old_errno;
332
return ret;
333
}
334
if(setuid(0) == -1){
335
ret = errno;
336
}
337
errno = old_errno;
338
return ret;
339
}
340
341
/* Set effective user ID to unprivileged saved user ID */
342
__attribute__((warn_unused_result))
343
int lower_privileges(void){
344
int old_errno = errno;
345
int ret = 0;
346
if(seteuid(uid) == -1){
347
ret = errno;
348
}
349
errno = old_errno;
350
return ret;
351
}
352
353
/* Lower privileges permanently */
354
__attribute__((warn_unused_result))
355
int lower_privileges_permanently(void){
356
int old_errno = errno;
357
int ret = 0;
358
if(setuid(uid) == -1){
359
ret = errno;
360
}
361
errno = old_errno;
362
return ret;
363
}
364
365
269
/*
366
270
* Initialize GPGME.
367
271
*/
387
291
return false;
388
292
}
389
293
390
/* Workaround for systems without a real-time clock; see also
391
Debian bug #894495: <https://bugs.debian.org/894495> */
392
do {
393
{
394
time_t currtime = time(NULL);
395
if(currtime != (time_t)-1){
396
struct tm tm;
397
if(gmtime_r(&currtime, &tm) == NULL) {
398
perror_plus("gmtime_r");
399
break;
400
}
401
if(tm.tm_year != 70 or tm.tm_mon != 0){
402
break;
403
}
404
if(debug){
405
fprintf_plus(stderr, "System clock is January 1970");
406
}
407
} else {
408
if(debug){
409
fprintf_plus(stderr, "System clock is invalid");
410
}
411
}
412
}
413
struct stat keystat;
414
ret = fstat(fd, &keystat);
415
if(ret != 0){
416
perror_plus("fstat");
417
break;
418
}
419
ret = raise_privileges();
420
if(ret != 0){
421
errno = ret;
422
perror_plus("Failed to raise privileges");
423
break;
424
}
425
if(debug){
426
fprintf_plus(stderr,
427
"Setting system clock to key file mtime");
428
}
429
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
430
perror_plus("clock_settime");
431
}
432
ret = lower_privileges();
433
if(ret != 0){
434
errno = ret;
435
perror_plus("Failed to lower privileges");
436
}
437
} while(false);
438
439
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
440
295
if(rc != GPG_ERR_NO_ERROR){
441
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
449
304
gpgme_strsource(rc), gpgme_strerror(rc));
450
305
return false;
451
306
}
452
{
453
gpgme_import_result_t import_result
454
= gpgme_op_import_result(mc->ctx);
455
if((import_result->imported < 1
456
or import_result->not_imported > 0)
457
and import_result->unchanged == 0){
458
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
459
fprintf_plus(stderr,
460
"The total number of considered keys: %d\n",
461
import_result->considered);
462
fprintf_plus(stderr,
463
"The number of keys without user ID: %d\n",
464
import_result->no_user_id);
465
fprintf_plus(stderr,
466
"The total number of imported keys: %d\n",
467
import_result->imported);
468
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
469
import_result->imported_rsa);
470
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
471
import_result->unchanged);
472
fprintf_plus(stderr, "The number of new user IDs: %d\n",
473
import_result->new_user_ids);
474
fprintf_plus(stderr, "The number of new sub keys: %d\n",
475
import_result->new_sub_keys);
476
fprintf_plus(stderr, "The number of new signatures: %d\n",
477
import_result->new_signatures);
478
fprintf_plus(stderr, "The number of new revocations: %d\n",
479
import_result->new_revocations);
480
fprintf_plus(stderr,
481
"The total number of secret keys read: %d\n",
482
import_result->secret_read);
483
fprintf_plus(stderr,
484
"The number of imported secret keys: %d\n",
485
import_result->secret_imported);
486
fprintf_plus(stderr,
487
"The number of unchanged secret keys: %d\n",
488
import_result->secret_unchanged);
489
fprintf_plus(stderr, "The number of keys not imported: %d\n",
490
import_result->not_imported);
491
for(gpgme_import_status_t import_status
492
= import_result->imports;
493
import_status != NULL;
494
import_status = import_status->next){
495
fprintf_plus(stderr, "Import status for key: %s\n",
496
import_status->fpr);
497
if(import_status->result != GPG_ERR_NO_ERROR){
498
fprintf_plus(stderr, "Import result: %s: %s\n",
499
gpgme_strsource(import_status->result),
500
gpgme_strerror(import_status->result));
501
}
502
fprintf_plus(stderr, "Key status:\n");
503
fprintf_plus(stderr,
504
import_status->status & GPGME_IMPORT_NEW
505
? "The key was new.\n"
506
: "The key was not new.\n");
507
fprintf_plus(stderr,
508
import_status->status & GPGME_IMPORT_UID
509
? "The key contained new user IDs.\n"
510
: "The key did not contain new user IDs.\n");
511
fprintf_plus(stderr,
512
import_status->status & GPGME_IMPORT_SIG
513
? "The key contained new signatures.\n"
514
: "The key did not contain new signatures.\n");
515
fprintf_plus(stderr,
516
import_status->status & GPGME_IMPORT_SUBKEY
517
? "The key contained new sub keys.\n"
518
: "The key did not contain new sub keys.\n");
519
fprintf_plus(stderr,
520
import_status->status & GPGME_IMPORT_SECRET
521
? "The key contained a secret key.\n"
522
: "The key did not contain a secret key.\n");
523
}
524
return false;
525
}
526
}
527
307
528
ret = close(fd);
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
529
309
if(ret == -1){
530
310
perror_plus("close");
531
311
}
570
350
/* Create new GPGME "context" */
571
351
rc = gpgme_new(&(mc->ctx));
572
352
if(rc != GPG_ERR_NO_ERROR){
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
575
356
return false;
576
357
}
577
358
613
394
/* Create new empty GPGME data buffer for the plaintext */
614
395
rc = gpgme_data_new(&dh_plain);
615
396
if(rc != GPG_ERR_NO_ERROR){
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
617
399
gpgme_strsource(rc), gpgme_strerror(rc));
618
400
gpgme_data_release(dh_crypto);
619
401
return -1;
632
414
if(result == NULL){
633
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
634
416
} else {
635
if(result->unsupported_algorithm != NULL) {
636
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
637
result->unsupported_algorithm);
638
}
639
fprintf_plus(stderr, "Wrong key usage: %s\n",
640
result->wrong_key_usage ? "Yes" : "No");
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
641
421
if(result->file_name != NULL){
642
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
643
423
}
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
426
while(recipient != NULL){
647
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
648
gpgme_pubkey_algo_name(r->pubkey_algo));
649
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
650
431
fprintf_plus(stderr, "Secret key available: %s\n",
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
652
435
}
653
436
}
654
437
}
730
513
fprintf_plus(stderr, "GnuTLS: %s", string);
731
514
}
732
515
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
734
517
static int init_gnutls_global(const char *pubkeyfilename,
735
518
const char *seckeyfilename,
736
519
const char *dhparamsfilename,
737
520
mandos_context *mc){
738
521
int ret;
522
unsigned int uret;
739
523
740
524
if(debug){
741
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
742
526
}
743
527
528
ret = gnutls_global_init();
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
532
return -1;
533
}
534
744
535
if(debug){
745
536
/* "Use a log level over 10 to enable all debugging options."
746
537
* - GnuTLS manual
754
545
if(ret != GNUTLS_E_SUCCESS){
755
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
756
547
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
757
549
return -1;
758
550
}
759
551
760
552
if(debug){
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
763
555
pubkeyfilename,
764
556
seckeyfilename);
765
557
}
766
558
767
#if GNUTLS_VERSION_NUMBER >= 0x030606
768
ret = gnutls_certificate_set_rawpk_key_file
769
(mc->cred, pubkeyfilename, seckeyfilename,
770
GNUTLS_X509_FMT_PEM, /* format */
771
NULL, /* pass */
772
/* key_usage */
773
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
774
NULL, /* names */
775
0, /* names_length */
776
/* privkey_flags */
777
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
778
0); /* pkcs11_flags */
779
#elif GNUTLS_VERSION_NUMBER < 0x030600
780
559
ret = gnutls_certificate_set_openpgp_key_file
781
560
(mc->cred, pubkeyfilename, seckeyfilename,
782
561
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
786
562
if(ret != GNUTLS_E_SUCCESS){
787
563
fprintf_plus(stderr,
788
"Error[%d] while reading the key pair ('%s',"
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
789
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
790
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
791
567
safer_gnutls_strerror(ret));
839
615
}
840
616
params.size += (unsigned int)bytes_read;
841
617
}
842
ret = close(dhpfile);
843
if(ret == -1){
844
perror_plus("close");
845
}
846
618
if(params.data == NULL){
847
619
dhparamsfilename = NULL;
848
620
}
857
629
safer_gnutls_strerror(ret));
858
630
dhparamsfilename = NULL;
859
631
}
860
free(params.data);
861
632
} while(false);
862
633
}
863
634
if(dhparamsfilename == NULL){
864
635
if(mc->dh_bits == 0){
865
#if GNUTLS_VERSION_NUMBER < 0x030600
866
636
/* Find out the optimal number of DH bits */
867
637
/* Try to read the private key file */
868
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
948
718
}
949
719
}
950
720
}
951
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
952
722
if(uret != 0){
953
723
mc->dh_bits = uret;
954
724
if(debug){
966
736
safer_gnutls_strerror(ret));
967
737
goto globalfail;
968
738
}
969
#endif
970
} else { /* dh_bits != 0 */
971
if(debug){
972
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
973
mc->dh_bits);
974
}
975
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
976
if(ret != GNUTLS_E_SUCCESS){
977
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
978
" bits): %s\n", mc->dh_bits,
979
safer_gnutls_strerror(ret));
980
goto globalfail;
981
}
982
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
983
749
}
984
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
985
752
986
753
return 0;
987
754
988
755
globalfail:
989
756
990
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
991
759
gnutls_dh_params_deinit(mc->dh_params);
992
760
return -1;
993
761
}
998
766
int ret;
999
767
/* GnuTLS session creation */
1000
768
do {
1001
ret = gnutls_init(session, (GNUTLS_SERVER
1002
#if GNUTLS_VERSION_NUMBER >= 0x030506
1003
| GNUTLS_NO_TICKETS
1004
#endif
1005
#if GNUTLS_VERSION_NUMBER >= 0x030606
1006
| GNUTLS_ENABLE_RAWPK
1007
#endif
1008
));
769
ret = gnutls_init(session, GNUTLS_SERVER);
1009
770
if(quit_now){
1010
771
return -1;
1011
772
}
1059
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1060
821
__attribute__((unused)) const char *txt){}
1061
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
1062
875
/* Helper function to add_local_route() and delete_local_route() */
1063
876
__attribute__((nonnull, warn_unused_result))
1064
877
static bool add_delete_local_route(const bool add,
1103
916
ret = setgid(0);
1104
917
if(ret == -1){
1105
918
perror_plus("setgid");
1106
close(devnull);
1107
919
_exit(EX_NOPERM);
1108
920
}
1109
921
/* Reset supplementary groups */
1111
923
ret = setgroups(0, NULL);
1112
924
if(ret == -1){
1113
925
perror_plus("setgroups");
1114
close(devnull);
1115
926
_exit(EX_NOPERM);
1116
927
}
1117
928
}
1118
929
ret = dup2(devnull, STDIN_FILENO);
1119
930
if(ret == -1){
1120
931
perror_plus("dup2(devnull, STDIN_FILENO)");
1121
close(devnull);
1122
932
_exit(EX_OSERR);
1123
933
}
1124
ret = close(devnull);
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1125
935
if(ret == -1){
1126
936
perror_plus("close");
937
_exit(EX_OSERR);
1127
938
}
1128
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1129
940
if(ret == -1){
1143
954
helper, O_RDONLY));
1144
955
if(helper_fd == -1){
1145
956
perror_plus("openat");
1146
close(helperdir_fd);
1147
957
_exit(EX_UNAVAILABLE);
1148
958
}
1149
close(helperdir_fd);
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
1150
960
#ifdef __GNUC__
1151
961
#pragma GCC diagnostic push
1152
962
#pragma GCC diagnostic ignored "-Wcast-qual"
1164
974
}
1165
975
if(pid == -1){
1166
976
perror_plus("fork");
1167
close(devnull);
1168
977
return false;
1169
978
}
1170
ret = close(devnull);
1171
if(ret == -1){
1172
perror_plus("close");
1173
}
1174
979
int status;
1175
980
pid_t pret = -1;
1176
981
errno = 0;
1276
1081
bool match = false;
1277
1082
{
1278
1083
char *interface = NULL;
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1282
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1283
1087
match = true;
1284
1088
break;
1326
1130
goto mandos_end;
1327
1131
}
1328
1132
1133
memset(&to, 0, sizeof(to));
1329
1134
if(af == AF_INET6){
1330
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1331
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1332
ret = inet_pton(af, ip, &to6->sin6_addr);
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1333
1137
} else { /* IPv4 */
1334
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1335
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1336
ret = inet_pton(af, ip, &to4->sin_addr);
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1337
1140
}
1338
1141
if(ret < 0 ){
1339
1142
int e = errno;
1418
1221
sizeof(struct sockaddr_in));
1419
1222
}
1420
1223
if(ret < 0){
1421
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1224
if(errno == ENETUNREACH
1422
1225
and if_index != AVAHI_IF_UNSPEC
1423
1226
and connect_to == NULL
1424
1227
and not route_added and
1437
1240
with an explicit route added with the server's address.
1438
1241
1439
1242
Avahi bug reference:
1440
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1243
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1441
1244
https://bugs.debian.org/587961
1442
1245
*/
1443
1246
if(debug){
1623
1426
&decrypted_buffer, mc);
1624
1427
if(decrypted_buffer_size >= 0){
1625
1428
1626
clearerr(stdout);
1627
1429
written = 0;
1628
1430
while(written < (size_t) decrypted_buffer_size){
1629
1431
if(quit_now){
1645
1447
}
1646
1448
written += (size_t)ret;
1647
1449
}
1648
ret = fflush(stdout);
1649
if(ret != 0){
1650
int e = errno;
1651
if(debug){
1652
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1653
strerror(errno));
1654
}
1655
errno = e;
1656
goto mandos_end;
1657
}
1658
1450
retval = 0;
1659
1451
}
1660
1452
}
1673
1465
free(decrypted_buffer);
1674
1466
free(buffer);
1675
1467
if(tcp_sd >= 0){
1676
ret = close(tcp_sd);
1468
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1677
1469
}
1678
1470
if(ret == -1){
1679
1471
if(e == 0){
1691
1483
return retval;
1692
1484
}
1693
1485
1486
__attribute__((nonnull))
1694
1487
static void resolve_callback(AvahiSServiceResolver *r,
1695
1488
AvahiIfIndex interface,
1696
1489
AvahiProtocol proto,
1833
1626
__attribute__((nonnull, warn_unused_result))
1834
1627
bool get_flags(const char *ifname, struct ifreq *ifr){
1835
1628
int ret;
1836
int old_errno;
1629
error_t ret_errno;
1837
1630
1838
1631
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1839
1632
if(s < 0){
1840
old_errno = errno;
1633
ret_errno = errno;
1841
1634
perror_plus("socket");
1842
errno = old_errno;
1635
errno = ret_errno;
1843
1636
return false;
1844
1637
}
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1638
strcpy(ifr->ifr_name, ifname);
1847
1639
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1848
1640
if(ret == -1){
1849
1641
if(debug){
1850
old_errno = errno;
1642
ret_errno = errno;
1851
1643
perror_plus("ioctl SIOCGIFFLAGS");
1852
errno = old_errno;
1853
}
1854
if((close(s) == -1) and debug){
1855
old_errno = errno;
1856
perror_plus("close");
1857
errno = old_errno;
1644
errno = ret_errno;
1858
1645
}
1859
1646
return false;
1860
1647
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1866
1648
return true;
1867
1649
}
1868
1650
2129
1911
return;
2130
1912
}
2131
1913
}
2132
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2133
if(devnull == -1){
2134
perror_plus("open(\"/dev/null\", O_RDONLY)");
2135
return;
2136
}
1914
#ifdef __GLIBC__
1915
#if __GLIBC_PREREQ(2, 15)
2137
1916
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2138
1917
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1920
alphasort);
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1924
alphasort);
1925
#endif /* not __GLIBC__ */
2139
1926
if(numhooks == -1){
2140
1927
perror_plus("scandir");
2141
close(devnull);
2142
1928
return;
2143
1929
}
2144
1930
struct dirent *direntry;
2145
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
2146
1937
for(int i = 0; i < numhooks; i++){
2147
1938
direntry = direntries[i];
2148
1939
if(debug){
2219
2010
perror_plus("openat");
2220
2011
_exit(EXIT_FAILURE);
2221
2012
}
2222
if(close(hookdir_fd) == -1){
2013
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2223
2014
perror_plus("close");
2224
2015
_exit(EXIT_FAILURE);
2225
2016
}
2228
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2229
2020
_exit(EX_OSERR);
2230
2021
}
2231
ret = close(devnull);
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2232
2023
if(ret == -1){
2233
2024
perror_plus("close");
2234
2025
_exit(EX_OSERR);
2283
2074
free(direntry);
2284
2075
}
2285
2076
free(direntries);
2286
if(close(hookdir_fd) == -1){
2077
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2287
2078
perror_plus("close");
2288
2079
} else {
2289
2080
hookdir_fd = -1;
2292
2083
}
2293
2084
2294
2085
__attribute__((nonnull, warn_unused_result))
2295
int bring_up_interface(const char *const interface,
2296
const float delay){
2297
int old_errno = errno;
2086
error_t bring_up_interface(const char *const interface,
2087
const float delay){
2088
error_t old_errno = errno;
2298
2089
int ret;
2299
2090
struct ifreq network;
2300
2091
unsigned int if_index = if_nametoindex(interface);
2310
2101
}
2311
2102
2312
2103
if(not interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2104
error_t ret_errno = 0, ioctl_errno = 0;
2315
2105
if(not get_flags(interface, &network)){
2316
2106
ret_errno = errno;
2317
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2330
2120
}
2331
2121
2332
2122
if(quit_now){
2333
ret = close(sd);
2123
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2334
2124
if(ret == -1){
2335
2125
perror_plus("close");
2336
2126
}
2386
2176
}
2387
2177
2388
2178
/* Close the socket */
2389
ret = close(sd);
2179
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2390
2180
if(ret == -1){
2391
2181
perror_plus("close");
2392
2182
}
2404
2194
2405
2195
/* Sleep checking until interface is running.
2406
2196
Check every 0.25s, up to total time of delay */
2407
for(int i = 0; i < delay * 4; i++){
2197
for(int i=0; i < delay * 4; i++){
2408
2198
if(interface_is_running(interface)){
2409
2199
break;
2410
2200
}
2420
2210
}
2421
2211
2422
2212
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
2213
error_t take_down_interface(const char *const interface){
2214
error_t old_errno = errno;
2425
2215
struct ifreq network;
2426
2216
unsigned int if_index = if_nametoindex(interface);
2427
2217
if(if_index == 0){
2430
2220
return ENXIO;
2431
2221
}
2432
2222
if(interface_is_up(interface)){
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
2223
error_t ret_errno = 0, ioctl_errno = 0;
2435
2224
if(not get_flags(interface, &network) and debug){
2436
2225
ret_errno = errno;
2437
2226
fprintf_plus(stderr, "Failed to get flags for interface "
2475
2264
}
2476
2265
2477
2266
/* Close the socket */
2478
int ret = close(sd);
2267
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2479
2268
if(ret == -1){
2480
2269
perror_plus("close");
2481
2270
}
2497
2286
2498
2287
int main(int argc, char *argv[]){
2499
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
2500
#if GNUTLS_VERSION_NUMBER >= 0x030606
2501
.priority = "SECURE128:!CTYPE-X.509"
2502
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2503
":%PROFILE_ULTRA",
2504
#elif GNUTLS_VERSION_NUMBER < 0x030600
2505
.priority = "SECURE256:!CTYPE-X.509"
2506
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2507
#else
2508
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2509
#endif
2510
.current_server = NULL, .interfaces = NULL,
2511
.interfaces_size = 0 };
2289
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2291
.interfaces = NULL, .interfaces_size = 0 };
2512
2292
AvahiSServiceBrowser *sb = NULL;
2513
2293
error_t ret_errno;
2514
2294
int ret;
2523
2303
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2524
2304
const char *seckey = PATHDIR "/" SECKEY;
2525
2305
const char *pubkey = PATHDIR "/" PUBKEY;
2526
#if GNUTLS_VERSION_NUMBER >= 0x030606
2527
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2528
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2529
#endif
2530
2306
const char *dh_params_file = NULL;
2531
2307
char *interfaces_hooks = NULL;
2532
2308
2580
2356
{ .name = "pubkey", .key = 'p',
2581
2357
.arg = "FILE",
2582
2358
.doc = "OpenPGP public key file base name",
2583
.group = 1 },
2584
{ .name = "tls-privkey", .key = 't',
2585
.arg = "FILE",
2586
#if GNUTLS_VERSION_NUMBER >= 0x030606
2587
.doc = "TLS private key file base name",
2588
#else
2589
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2590
#endif
2591
.group = 1 },
2592
{ .name = "tls-pubkey", .key = 'T',
2593
.arg = "FILE",
2594
#if GNUTLS_VERSION_NUMBER >= 0x030606
2595
.doc = "TLS public key file base name",
2596
#else
2597
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2598
#endif
2599
.group = 1 },
2359
.group = 2 },
2600
2360
{ .name = "dh-bits", .key = 129,
2601
2361
.arg = "BITS",
2602
2362
.doc = "Bit length of the prime number used in the"
2658
2418
case 'p': /* --pubkey */
2659
2419
pubkey = arg;
2660
2420
break;
2661
case 't': /* --tls-privkey */
2662
#if GNUTLS_VERSION_NUMBER >= 0x030606
2663
tls_privkey = arg;
2664
#endif
2665
break;
2666
case 'T': /* --tls-pubkey */
2667
#if GNUTLS_VERSION_NUMBER >= 0x030606
2668
tls_pubkey = arg;
2669
#endif
2670
break;
2671
2421
case 129: /* --dh-bits */
2672
2422
errno = 0;
2673
2423
tmpmax = strtoimax(arg, &tmp, 10);
2708
2458
argp_state_help(state, state->out_stream,
2709
2459
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2710
2460
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2712
2461
case -3: /* --usage */
2713
2462
argp_state_help(state, state->out_stream,
2714
2463
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2716
2464
case 'V': /* --version */
2717
2465
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2718
2466
exit(argp_err_exit_status);
2727
2475
.args_doc = "",
2728
2476
.doc = "Mandos client -- Get and decrypt"
2729
2477
" passwords from a Mandos server" };
2730
ret_errno = argp_parse(&argp, argc, argv,
2731
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2732
switch(ret_errno){
2478
ret = argp_parse(&argp, argc, argv,
2479
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2480
switch(ret){
2733
2481
case 0:
2734
2482
break;
2735
2483
case ENOMEM:
2736
2484
default:
2737
errno = ret_errno;
2485
errno = ret;
2738
2486
perror_plus("argp_parse");
2739
2487
exitcode = EX_OSERR;
2740
2488
goto end;
2745
2493
}
2746
2494
2747
2495
{
2496
/* Work around Debian bug #633582:
2497
<http://bugs.debian.org/633582> */
2498
2748
2499
/* Re-raise privileges */
2749
ret = raise_privileges();
2750
if(ret != 0){
2751
errno = ret;
2500
ret_errno = raise_privileges();
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2752
2503
perror_plus("Failed to raise privileges");
2753
2504
} else {
2754
2505
struct stat st;
2755
2506
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2759
2507
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2760
2508
int seckey_fd = open(seckey, O_RDONLY);
2761
2509
if(seckey_fd == -1){
2773
2521
}
2774
2522
}
2775
2523
}
2776
close(seckey_fd);
2524
TEMP_FAILURE_RETRY(close(seckey_fd));
2777
2525
}
2778
2526
}
2779
2527
2794
2542
}
2795
2543
}
2796
2544
}
2797
close(pubkey_fd);
2545
TEMP_FAILURE_RETRY(close(pubkey_fd));
2798
2546
}
2799
2547
}
2800
2548
2801
if(dh_params_file != NULL
2802
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2549
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2803
2550
int dhparams_fd = open(dh_params_file, O_RDONLY);
2804
2551
if(dhparams_fd == -1){
2805
2552
perror_plus("open");
2816
2563
}
2817
2564
}
2818
2565
}
2819
close(dhparams_fd);
2566
TEMP_FAILURE_RETRY(close(dhparams_fd));
2820
2567
}
2821
2568
}
2822
2569
2823
/* Work around Debian bug #981302
2824
<https://bugs.debian.org/981302> */
2825
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
2826
ret = symlink("/proc/self/fd", "/dev/fd");
2827
if(ret == -1){
2828
perror_plus("Failed to create /dev/fd symlink");
2829
}
2830
}
2831
2832
2570
/* Lower privileges */
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2571
ret_errno = lower_privileges();
2572
if(ret_errno != 0){
2573
errno = ret_errno;
2836
2574
perror_plus("Failed to lower privileges");
2837
2575
}
2838
2576
}
3038
2776
goto end;
3039
2777
}
3040
2778
3041
#if GNUTLS_VERSION_NUMBER >= 0x030606
3042
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3043
#elif GNUTLS_VERSION_NUMBER < 0x030600
3044
2779
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3045
#else
3046
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3047
#endif
3048
2780
if(ret == -1){
3049
2781
fprintf_plus(stderr, "init_gnutls_global failed\n");
3050
2782
exitcode = EX_UNAVAILABLE;
3172
2904
3173
2905
/* Allocate a new server */
3174
2906
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3175
&config, NULL, NULL, &ret);
2907
&config, NULL, NULL, &ret_errno);
3176
2908
3177
2909
/* Free the Avahi configuration data */
3178
2910
avahi_server_config_free(&config);
3181
2913
/* Check if creating the Avahi server object succeeded */
3182
2914
if(mc.server == NULL){
3183
2915
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3184
avahi_strerror(ret));
2916
avahi_strerror(ret_errno));
3185
2917
exitcode = EX_UNAVAILABLE;
3186
2918
goto end;
3187
2919
}
3222
2954
end:
3223
2955
3224
2956
if(debug){
3225
if(signal_received){
3226
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3227
argv[0], signal_received,
3228
strsignal(signal_received));
3229
} else {
3230
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3231
}
2957
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3232
2958
}
3233
2959
3234
2960
/* Cleanup things */
3245
2971
3246
2972
if(gnutls_initialized){
3247
2973
gnutls_certificate_free_credentials(mc.cred);
2974
gnutls_global_deinit();
3248
2975
gnutls_dh_params_deinit(mc.dh_params);
3249
2976
}
3250
2977
3273
3000
3274
3001
/* Re-raise privileges */
3275
3002
{
3276
ret = raise_privileges();
3277
if(ret != 0){
3278
errno = ret;
3003
ret_errno = raise_privileges();
3004
if(ret_errno != 0){
3005
errno = ret_errno;
3279
3006
perror_plus("Failed to raise privileges");
3280
3007
} else {
3281
3008
3286
3013
/* Take down the network interfaces which were brought up */
3287
3014
{
3288
3015
char *interface = NULL;
3289
while((interface = argz_next(interfaces_to_take_down,
3290
interfaces_to_take_down_size,
3291
interface))){
3292
ret = take_down_interface(interface);
3293
if(ret != 0){
3294
errno = ret;
3016
while((interface=argz_next(interfaces_to_take_down,
3017
interfaces_to_take_down_size,
3018
interface))){
3019
ret_errno = take_down_interface(interface);
3020
if(ret_errno != 0){
3021
errno = ret_errno;
3295
3022
perror_plus("Failed to take down interface");
3296
3023
}
3297
3024
}
3302
3029
}
3303
3030
}
3304
3031
3305
ret = lower_privileges_permanently();
3306
if(ret != 0){
3307
errno = ret;
3032
ret_errno = lower_privileges_permanently();
3033
if(ret_errno != 0){
3034
errno = ret_errno;
3308
3035
perror_plus("Failed to lower privileges permanently");
3309
3036
}
3310
3037
}
3312
3039
free(interfaces_to_take_down);
3313
3040
free(interfaces_hooks);
3314
3041
3315
void clean_dir_at(int base, const char * const dirname,
3316
uintmax_t level){
3317
struct dirent **direntries = NULL;
3318
int dret;
3319
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3320
O_RDONLY
3321
| O_NOFOLLOW
3322
| O_DIRECTORY
3323
| O_PATH));
3324
if(dir_fd == -1){
3325
perror_plus("open");
3326
return;
3327
}
3328
int numentries = scandirat(dir_fd, ".", &direntries,
3329
notdotentries, alphasort);
3330
if(numentries >= 0){
3331
for(int i = 0; i < numentries; i++){
3332
if(debug){
3333
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3334
dirname, direntries[i]->d_name);
3335
}
3336
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3337
if(dret == -1){
3338
if(errno == EISDIR){
3339
dret = unlinkat(dir_fd, direntries[i]->d_name,
3340
AT_REMOVEDIR);
3341
}
3342
if((dret == -1) and (errno == ENOTEMPTY)
3343
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3344
== 0) and (level == 0)){
3345
/* Recurse only in this special case */
3346
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3347
dret = 0;
3348
}
3349
if((dret == -1) and (errno != ENOENT)){
3350
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3351
direntries[i]->d_name, strerror(errno));
3352
}
3353
}
3354
free(direntries[i]);
3355
}
3356
3357
/* need to clean even if 0 because man page doesn't specify */
3358
free(direntries);
3359
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3360
if(dret == -1 and errno != ENOENT){
3361
perror_plus("rmdir");
3362
}
3363
} else {
3364
perror_plus("scandirat");
3365
}
3366
close(dir_fd);
3367
}
3368
3369
3042
/* Removes the GPGME temp directory and all files inside */
3370
3043
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);
3044
struct dirent **direntries = NULL;
3045
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3046
| O_NOFOLLOW
3047
| O_DIRECTORY
3048
| O_PATH));
3049
if(tempdir_fd == -1){
3050
perror_plus("open");
3051
} else {
3052
#ifdef __GLIBC__
3053
#if __GLIBC_PREREQ(2, 15)
3054
int numentries = scandirat(tempdir_fd, ".", &direntries,
3055
notdotentries, alphasort);
3056
#else /* not __GLIBC_PREREQ(2, 15) */
3057
int numentries = scandir(tempdir, &direntries, notdotentries,
3058
alphasort);
3059
#endif /* not __GLIBC_PREREQ(2, 15) */
3060
#else /* not __GLIBC__ */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC__ */
3064
if(numentries >= 0){
3065
for(int i = 0; i < numentries; i++){
3066
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3067
if(ret == -1){
3068
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3069
" \"%s\", 0): %s\n", tempdir,
3070
direntries[i]->d_name, strerror(errno));
3071
}
3072
free(direntries[i]);
3073
}
3074
3075
/* need to clean even if 0 because man page doesn't specify */
3076
free(direntries);
3077
if(numentries == -1){
3078
perror_plus("scandir");
3079
}
3080
ret = rmdir(tempdir);
3081
if(ret == -1 and errno != ENOENT){
3082
perror_plus("rmdir");
3083
}
3084
}
3085
TEMP_FAILURE_RETRY(close(tempdir_fd));
3086
}
3372
3087
}
3373
3088
3374
3089
if(quit_now){
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