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- Committer: Teddy Hogeborn
- Date: 2024-11-17 17:28:47 UTC
- Revision ID: teddy@recompile.se-20241117172847-3bon1o16owybrmoo
mandos: Make configured network socket non-inheritable
If we are passed a pre-created created network socket as a file
descriptor, we should make it non-inheritable to checkers and other
subprocesses.
If we are passed a pre-created created network socket as a file
descriptor, we should make it non-inheritable to checkers and other
subprocesses.
- files added:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
12
* Copyright © 2008-2022 Teddy Hogeborn
13
* Copyright © 2008-2022 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
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.
24
26
*
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/>.
28
29
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
31
32
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
39
#endif /* not _FILE_OFFSET_BITS */
40
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
48
44
#include <stdbool.h> /* bool, false, true */
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() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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 */
111
#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,
63
129
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
130
#include <arpa/inet.h> /* inet_pton() */
131
#include <stdint.h> /* uint32_t, intptr_t, uint16_t */
132
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
133
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 */
85
138
86
139
#ifdef __linux__
87
140
#include <sys/klog.h> /* klogctl() */
100
153
101
154
/* GnuTLS */
102
155
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
104
gnutls_*
105
init_gnutls_session(),
106
GNUTLS_* */
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
107
158
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
159
/* gnutls_certificate_set_openpgp_key_file(),
160
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
110
165
111
166
/* GPGME */
112
167
#include <gpgme.h> /* All GPGME types, constants and
113
168
functions:
114
gpgme_*
115
GPGME_PROTOCOL_OpenPGP,
116
GPG_ERR_NO_* */
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
117
172
118
173
#define BUFFER_SIZE 256
119
174
120
175
#define PATHDIR "/conf/conf.d/mandos"
121
176
#define SECKEY "seckey.txt"
122
177
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
180
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
181
124
182
bool debug = false;
125
183
static const char mandos_protocol_version[] = "1";
126
184
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
185
const char *argp_program_bug_address = "<mandos@recompile.se>";
186
static const char sys_class_net[] = "/sys/class/net";
187
char *connect_to = NULL;
188
const char *hookdir = HOOKDIR;
189
int hookdir_fd = -1;
190
uid_t uid = 65534;
191
gid_t gid = 65534;
192
193
/* Doubly linked list that need to be circularly linked when used */
194
typedef struct server{
195
const char *ip;
196
in_port_t port;
197
AvahiIfIndex if_index;
198
int af;
199
struct timespec last_seen;
200
struct server *next;
201
struct server *prev;
202
} server;
128
203
129
204
/* Used for passing in values through the Avahi callback functions */
130
205
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
206
AvahiServer *server;
133
207
gnutls_certificate_credentials_t cred;
134
208
unsigned int dh_bits;
135
209
gnutls_dh_params_t dh_params;
136
210
const char *priority;
137
211
gpgme_ctx_t ctx;
212
server *current_server;
213
char *interfaces;
214
size_t interfaces_size;
138
215
} mandos_context;
139
216
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
217
/* global so signal handler can reach it*/
218
AvahiSimplePoll *simple_poll;
219
220
sig_atomic_t quit_now = 0;
221
int signal_received = 0;
222
223
/* Function to use when printing errors */
224
void perror_plus(const char *print_text){
225
int e = errno;
226
fprintf(stderr, "Mandos plugin %s: ",
227
program_invocation_short_name);
228
errno = e;
229
perror(print_text);
230
}
231
232
__attribute__((format (gnu_printf, 2, 3), nonnull))
233
int fprintf_plus(FILE *stream, const char *format, ...){
234
va_list ap;
235
va_start (ap, format);
236
237
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
238
program_invocation_short_name));
239
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
240
}
144
241
145
242
/*
146
243
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
244
* bytes. "buffer_capacity" is how much is currently allocated,
148
245
* "buffer_length" is how much is already used.
149
246
*/
247
__attribute__((nonnull, warn_unused_result))
150
248
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
249
size_t buffer_capacity){
152
250
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
251
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
252
if(new_buf == NULL){
253
int old_errno = errno;
254
free(*buffer);
255
errno = old_errno;
256
*buffer = NULL;
155
257
return 0;
156
258
}
259
*buffer = new_buf;
157
260
buffer_capacity += BUFFER_SIZE;
158
261
}
159
262
return buffer_capacity;
160
263
}
161
264
265
/* Add server to set of servers to retry periodically */
266
__attribute__((nonnull, warn_unused_result))
267
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
268
int af, server **current_server){
269
int ret;
270
server *new_server = malloc(sizeof(server));
271
if(new_server == NULL){
272
perror_plus("malloc");
273
return false;
274
}
275
*new_server = (server){ .ip = strdup(ip),
276
.port = port,
277
.if_index = if_index,
278
.af = af };
279
if(new_server->ip == NULL){
280
perror_plus("strdup");
281
free(new_server);
282
return false;
283
}
284
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
285
if(ret == -1){
286
perror_plus("clock_gettime");
287
#ifdef __GNUC__
288
#pragma GCC diagnostic push
289
#pragma GCC diagnostic ignored "-Wcast-qual"
290
#endif
291
free((char *)(new_server->ip));
292
#ifdef __GNUC__
293
#pragma GCC diagnostic pop
294
#endif
295
free(new_server);
296
return false;
297
}
298
/* Special case of first server */
299
if(*current_server == NULL){
300
new_server->next = new_server;
301
new_server->prev = new_server;
302
*current_server = new_server;
303
} else {
304
/* Place the new server last in the list */
305
new_server->next = *current_server;
306
new_server->prev = (*current_server)->prev;
307
new_server->prev->next = new_server;
308
(*current_server)->prev = new_server;
309
}
310
return true;
311
}
312
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
162
365
/*
163
366
* Initialize GPGME.
164
367
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
368
__attribute__((nonnull, warn_unused_result))
369
static bool init_gpgme(const char * const seckey,
370
const char * const pubkey,
371
const char * const tempdir,
372
mandos_context *mc){
168
373
gpgme_error_t rc;
169
374
gpgme_engine_info_t engine_info;
170
375
171
172
376
/*
173
377
* Helper function to insert pub and seckey to the engine keyring.
174
378
*/
175
bool import_key(const char *filename){
379
bool import_key(const char * const filename){
380
int ret;
176
381
int fd;
177
382
gpgme_data_t pgp_data;
178
383
179
384
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
385
if(fd == -1){
181
perror("open");
386
perror_plus("open");
182
387
return false;
183
388
}
184
389
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
185
439
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
440
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
441
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
442
gpgme_strsource(rc), gpgme_strerror(rc));
189
443
return false;
190
444
}
191
445
192
rc = gpgme_op_import(mc.ctx, pgp_data);
446
rc = gpgme_op_import(mc->ctx, pgp_data);
193
447
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
448
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
449
gpgme_strsource(rc), gpgme_strerror(rc));
196
450
return false;
197
451
}
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
}
198
527
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
528
ret = close(fd);
200
529
if(ret == -1){
201
perror("close");
530
perror_plus("close");
202
531
}
203
532
gpgme_data_release(pgp_data);
204
533
return true;
205
534
}
206
535
207
536
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
537
fprintf_plus(stderr, "Initializing GPGME\n");
209
538
}
210
539
211
540
/* Init GPGME */
212
541
gpgme_check_version(NULL);
213
542
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
543
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
544
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
217
546
return false;
218
547
}
219
548
220
/* Set GPGME home directory for the OpenPGP engine only */
549
/* Set GPGME home directory for the OpenPGP engine only */
221
550
rc = gpgme_get_engine_info(&engine_info);
222
551
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
552
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
553
gpgme_strsource(rc), gpgme_strerror(rc));
225
554
return false;
226
555
}
227
556
while(engine_info != NULL){
233
562
engine_info = engine_info->next;
234
563
}
235
564
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
565
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
566
tempdir);
237
567
return false;
238
568
}
239
569
240
570
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
571
rc = gpgme_new(&(mc->ctx));
242
572
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
245
575
return false;
246
576
}
247
577
249
579
return false;
250
580
}
251
581
252
return true;
582
return true;
253
583
}
254
584
255
585
/*
256
586
* Decrypt OpenPGP data.
257
587
* Returns -1 on error
258
588
*/
589
__attribute__((nonnull, warn_unused_result))
259
590
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
591
size_t crypto_size,
261
char **plaintext){
592
char **plaintext,
593
mandos_context *mc){
262
594
gpgme_data_t dh_crypto, dh_plain;
263
595
gpgme_error_t rc;
264
596
ssize_t ret;
266
598
ssize_t plaintext_length = 0;
267
599
268
600
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
601
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
270
602
}
271
603
272
604
/* Create new GPGME data buffer from memory cryptotext */
273
605
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
606
0);
275
607
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
608
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
609
gpgme_strsource(rc), gpgme_strerror(rc));
278
610
return -1;
279
611
}
280
612
281
613
/* Create new empty GPGME data buffer for the plaintext */
282
614
rc = gpgme_data_new(&dh_plain);
283
615
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
617
gpgme_strsource(rc), gpgme_strerror(rc));
286
618
gpgme_data_release(dh_crypto);
287
619
return -1;
288
620
}
289
621
290
622
/* Decrypt data from the cryptotext data buffer to the plaintext
291
623
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
624
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
625
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
626
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
627
gpgme_strsource(rc), gpgme_strerror(rc));
296
628
plaintext_length = -1;
297
629
if(debug){
298
630
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
631
result = gpgme_op_decrypt_result(mc->ctx);
300
632
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
633
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
302
634
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
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");
307
641
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
642
fprintf_plus(stderr, "File name: %s\n", result->file_name);
309
643
}
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
647
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);
650
fprintf_plus(stderr, "Secret key available: %s\n",
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
320
652
}
321
653
}
322
654
}
324
656
}
325
657
326
658
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
659
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
328
660
}
329
661
330
662
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
663
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
664
perror_plus("gpgme_data_seek");
333
665
plaintext_length = -1;
334
666
goto decrypt_end;
335
667
}
337
669
*plaintext = NULL;
338
670
while(true){
339
671
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
341
plaintext_capacity);
672
(size_t)plaintext_length,
673
plaintext_capacity);
342
674
if(plaintext_capacity == 0){
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
675
perror_plus("incbuffer");
676
plaintext_length = -1;
677
goto decrypt_end;
346
678
}
347
679
348
680
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
353
685
break;
354
686
}
355
687
if(ret < 0){
356
perror("gpgme_data_read");
688
perror_plus("gpgme_data_read");
357
689
plaintext_length = -1;
358
690
goto decrypt_end;
359
691
}
361
693
}
362
694
363
695
if(debug){
364
fprintf(stderr, "Decrypted password is: ");
696
fprintf_plus(stderr, "Decrypted password is: ");
365
697
for(ssize_t i = 0; i < plaintext_length; i++){
366
698
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
367
699
}
378
710
return plaintext_length;
379
711
}
380
712
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
385
ret = "(unknown)";
386
return ret;
713
__attribute__((warn_unused_result, const))
714
static const char *safe_string(const char *str){
715
if(str == NULL)
716
return "(unknown)";
717
return str;
718
}
719
720
__attribute__((warn_unused_result))
721
static const char *safer_gnutls_strerror(int value){
722
const char *ret = gnutls_strerror(value);
723
return safe_string(ret);
387
724
}
388
725
389
726
/* GnuTLS log function callback */
727
__attribute__((nonnull))
390
728
static void debuggnutls(__attribute__((unused)) int level,
391
729
const char* string){
392
fprintf(stderr, "GnuTLS: %s", string);
730
fprintf_plus(stderr, "GnuTLS: %s", string);
393
731
}
394
732
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
395
734
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
735
const char *seckeyfilename,
736
const char *dhparamsfilename,
737
mandos_context *mc){
397
738
int ret;
398
739
399
740
if(debug){
400
fprintf(stderr, "Initializing GnuTLS\n");
401
}
402
403
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
407
return -1;
741
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
742
}
409
743
410
744
if(debug){
416
750
}
417
751
418
752
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
753
ret = gnutls_certificate_allocate_credentials(&mc->cred);
420
754
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
755
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
756
safer_gnutls_strerror(ret));
427
757
return -1;
428
758
}
429
759
430
760
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
763
pubkeyfilename,
764
seckeyfilename);
434
765
}
435
766
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
436
780
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
781
(mc->cred, pubkeyfilename, seckeyfilename,
438
782
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
439
786
if(ret != GNUTLS_E_SUCCESS){
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
787
fprintf_plus(stderr,
788
"Error[%d] while reading the key pair ('%s',"
789
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
790
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
791
safer_gnutls_strerror(ret));
445
792
goto globalfail;
446
793
}
447
794
448
795
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
453
goto globalfail;
454
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
796
ret = gnutls_dh_params_init(&mc->dh_params);
797
if(ret != GNUTLS_E_SUCCESS){
798
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
799
" initialization: %s\n",
800
safer_gnutls_strerror(ret));
801
goto globalfail;
802
}
803
/* If a Diffie-Hellman parameters file was given, try to use it */
804
if(dhparamsfilename != NULL){
805
gnutls_datum_t params = { .data = NULL, .size = 0 };
806
do {
807
int dhpfile = open(dhparamsfilename, O_RDONLY);
808
if(dhpfile == -1){
809
perror_plus("open");
810
dhparamsfilename = NULL;
811
break;
812
}
813
size_t params_capacity = 0;
814
while(true){
815
params_capacity = incbuffer((char **)¶ms.data,
816
(size_t)params.size,
817
(size_t)params_capacity);
818
if(params_capacity == 0){
819
perror_plus("incbuffer");
820
free(params.data);
821
params.data = NULL;
822
dhparamsfilename = NULL;
823
break;
824
}
825
ssize_t bytes_read = read(dhpfile,
826
params.data + params.size,
827
BUFFER_SIZE);
828
/* EOF */
829
if(bytes_read == 0){
830
break;
831
}
832
/* check bytes_read for failure */
833
if(bytes_read < 0){
834
perror_plus("read");
835
free(params.data);
836
params.data = NULL;
837
dhparamsfilename = NULL;
838
break;
839
}
840
params.size += (unsigned int)bytes_read;
841
}
842
ret = close(dhpfile);
843
if(ret == -1){
844
perror_plus("close");
845
}
846
if(params.data == NULL){
847
dhparamsfilename = NULL;
848
}
849
if(dhparamsfilename == NULL){
850
break;
851
}
852
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
853
GNUTLS_X509_FMT_PEM);
854
if(ret != GNUTLS_E_SUCCESS){
855
fprintf_plus(stderr, "Failed to parse DH parameters in file"
856
" \"%s\": %s\n", dhparamsfilename,
857
safer_gnutls_strerror(ret));
858
dhparamsfilename = NULL;
859
}
860
free(params.data);
861
} while(false);
862
}
863
if(dhparamsfilename == NULL){
864
if(mc->dh_bits == 0){
865
#if GNUTLS_VERSION_NUMBER < 0x030600
866
/* Find out the optimal number of DH bits */
867
/* Try to read the private key file */
868
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
869
do {
870
int secfile = open(seckeyfilename, O_RDONLY);
871
if(secfile == -1){
872
perror_plus("open");
873
break;
874
}
875
size_t buffer_capacity = 0;
876
while(true){
877
buffer_capacity = incbuffer((char **)&buffer.data,
878
(size_t)buffer.size,
879
(size_t)buffer_capacity);
880
if(buffer_capacity == 0){
881
perror_plus("incbuffer");
882
free(buffer.data);
883
buffer.data = NULL;
884
break;
885
}
886
ssize_t bytes_read = read(secfile,
887
buffer.data + buffer.size,
888
BUFFER_SIZE);
889
/* EOF */
890
if(bytes_read == 0){
891
break;
892
}
893
/* check bytes_read for failure */
894
if(bytes_read < 0){
895
perror_plus("read");
896
free(buffer.data);
897
buffer.data = NULL;
898
break;
899
}
900
buffer.size += (unsigned int)bytes_read;
901
}
902
close(secfile);
903
} while(false);
904
/* If successful, use buffer to parse private key */
905
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
906
if(buffer.data != NULL){
907
{
908
gnutls_openpgp_privkey_t privkey = NULL;
909
ret = gnutls_openpgp_privkey_init(&privkey);
910
if(ret != GNUTLS_E_SUCCESS){
911
fprintf_plus(stderr, "Error initializing OpenPGP key"
912
" structure: %s",
913
safer_gnutls_strerror(ret));
914
free(buffer.data);
915
buffer.data = NULL;
916
} else {
917
ret = gnutls_openpgp_privkey_import
918
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
919
if(ret != GNUTLS_E_SUCCESS){
920
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
921
safer_gnutls_strerror(ret));
922
privkey = NULL;
923
}
924
free(buffer.data);
925
buffer.data = NULL;
926
if(privkey != NULL){
927
/* Use private key to suggest an appropriate
928
sec_param */
929
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
930
gnutls_openpgp_privkey_deinit(privkey);
931
if(debug){
932
fprintf_plus(stderr, "This OpenPGP key implies using"
933
" a GnuTLS security parameter \"%s\".\n",
934
safe_string(gnutls_sec_param_get_name
935
(sec_param)));
936
}
937
}
938
}
939
}
940
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
941
/* Err on the side of caution */
942
sec_param = GNUTLS_SEC_PARAM_ULTRA;
943
if(debug){
944
fprintf_plus(stderr, "Falling back to security parameter"
945
" \"%s\"\n",
946
safe_string(gnutls_sec_param_get_name
947
(sec_param)));
948
}
949
}
950
}
951
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
952
if(uret != 0){
953
mc->dh_bits = uret;
954
if(debug){
955
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
956
" implies %u DH bits; using that.\n",
957
safe_string(gnutls_sec_param_get_name
958
(sec_param)),
959
mc->dh_bits);
960
}
961
} else {
962
fprintf_plus(stderr, "Failed to get implied number of DH"
963
" bits for security parameter \"%s\"): %s\n",
964
safe_string(gnutls_sec_param_get_name
965
(sec_param)),
966
safer_gnutls_strerror(ret));
967
goto globalfail;
968
}
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);
983
}
984
}
463
985
464
986
return 0;
465
987
466
988
globalfail:
467
989
468
gnutls_certificate_free_credentials(mc.cred);
469
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
990
gnutls_certificate_free_credentials(mc->cred);
991
gnutls_dh_params_deinit(mc->dh_params);
471
992
return -1;
472
993
}
473
994
474
static int init_gnutls_session(gnutls_session_t *session){
995
__attribute__((nonnull, warn_unused_result))
996
static int init_gnutls_session(gnutls_session_t *session,
997
mandos_context *mc){
475
998
int ret;
476
999
/* GnuTLS session creation */
477
ret = gnutls_init(session, GNUTLS_SERVER);
1000
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
));
1009
if(quit_now){
1010
return -1;
1011
}
1012
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
1013
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
1014
fprintf_plus(stderr,
1015
"Error in GnuTLS session initialization: %s\n",
1016
safer_gnutls_strerror(ret));
481
1017
}
482
1018
483
1019
{
484
1020
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
1021
do {
1022
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
1023
if(quit_now){
1024
gnutls_deinit(*session);
1025
return -1;
1026
}
1027
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
1028
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
1029
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1030
fprintf_plus(stderr, "GnuTLS error: %s\n",
1031
safer_gnutls_strerror(ret));
490
1032
gnutls_deinit(*session);
491
1033
return -1;
492
1034
}
493
1035
}
494
1036
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
1037
do {
1038
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1039
mc->cred);
1040
if(quit_now){
1041
gnutls_deinit(*session);
1042
return -1;
1043
}
1044
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
1045
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
1046
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1047
safer_gnutls_strerror(ret));
500
1048
gnutls_deinit(*session);
501
1049
return -1;
502
1050
}
503
1051
504
1052
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
507
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
1053
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
509
1054
510
1055
return 0;
511
1056
}
514
1059
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
1060
__attribute__((unused)) const char *txt){}
516
1061
1062
/* Helper function to add_local_route() and delete_local_route() */
1063
__attribute__((nonnull, warn_unused_result))
1064
static bool add_delete_local_route(const bool add,
1065
const char *address,
1066
AvahiIfIndex if_index){
1067
int ret;
1068
char helper[] = "mandos-client-iprouteadddel";
1069
char add_arg[] = "add";
1070
char delete_arg[] = "delete";
1071
char debug_flag[] = "--debug";
1072
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1073
if(pluginhelperdir == NULL){
1074
if(debug){
1075
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1076
" variable not set; cannot run helper\n");
1077
}
1078
return false;
1079
}
1080
1081
char interface[IF_NAMESIZE];
1082
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1083
perror_plus("if_indextoname");
1084
return false;
1085
}
1086
1087
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1088
if(devnull == -1){
1089
perror_plus("open(\"/dev/null\", O_RDONLY)");
1090
return false;
1091
}
1092
pid_t pid = fork();
1093
if(pid == 0){
1094
/* Child */
1095
/* Raise privileges */
1096
errno = raise_privileges_permanently();
1097
if(errno != 0){
1098
perror_plus("Failed to raise privileges");
1099
/* _exit(EX_NOPERM); */
1100
} else {
1101
/* Set group */
1102
errno = 0;
1103
ret = setgid(0);
1104
if(ret == -1){
1105
perror_plus("setgid");
1106
close(devnull);
1107
_exit(EX_NOPERM);
1108
}
1109
/* Reset supplementary groups */
1110
errno = 0;
1111
ret = setgroups(0, NULL);
1112
if(ret == -1){
1113
perror_plus("setgroups");
1114
close(devnull);
1115
_exit(EX_NOPERM);
1116
}
1117
}
1118
ret = dup2(devnull, STDIN_FILENO);
1119
if(ret == -1){
1120
perror_plus("dup2(devnull, STDIN_FILENO)");
1121
close(devnull);
1122
_exit(EX_OSERR);
1123
}
1124
ret = close(devnull);
1125
if(ret == -1){
1126
perror_plus("close");
1127
}
1128
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1129
if(ret == -1){
1130
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1131
_exit(EX_OSERR);
1132
}
1133
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1134
O_RDONLY
1135
| O_DIRECTORY
1136
| O_PATH
1137
| O_CLOEXEC));
1138
if(helperdir_fd == -1){
1139
perror_plus("open");
1140
_exit(EX_UNAVAILABLE);
1141
}
1142
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1143
helper, O_RDONLY));
1144
if(helper_fd == -1){
1145
perror_plus("openat");
1146
close(helperdir_fd);
1147
_exit(EX_UNAVAILABLE);
1148
}
1149
close(helperdir_fd);
1150
#ifdef __GNUC__
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wcast-qual"
1153
#endif
1154
if(fexecve(helper_fd, (char *const [])
1155
{ helper, add ? add_arg : delete_arg, (char *)address,
1156
interface, debug ? debug_flag : NULL, NULL },
1157
environ) == -1){
1158
#ifdef __GNUC__
1159
#pragma GCC diagnostic pop
1160
#endif
1161
perror_plus("fexecve");
1162
_exit(EXIT_FAILURE);
1163
}
1164
}
1165
if(pid == -1){
1166
perror_plus("fork");
1167
close(devnull);
1168
return false;
1169
}
1170
ret = close(devnull);
1171
if(ret == -1){
1172
perror_plus("close");
1173
}
1174
int status;
1175
pid_t pret = -1;
1176
errno = 0;
1177
do {
1178
pret = waitpid(pid, &status, 0);
1179
if(pret == -1 and errno == EINTR and quit_now){
1180
int errno_raising = 0;
1181
if((errno = raise_privileges()) != 0){
1182
errno_raising = errno;
1183
perror_plus("Failed to raise privileges in order to"
1184
" kill helper program");
1185
}
1186
if(kill(pid, SIGTERM) == -1){
1187
perror_plus("kill");
1188
}
1189
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1190
perror_plus("Failed to lower privileges after killing"
1191
" helper program");
1192
}
1193
return false;
1194
}
1195
} while(pret == -1 and errno == EINTR);
1196
if(pret == -1){
1197
perror_plus("waitpid");
1198
return false;
1199
}
1200
if(WIFEXITED(status)){
1201
if(WEXITSTATUS(status) != 0){
1202
fprintf_plus(stderr, "Error: iprouteadddel exited"
1203
" with status %d\n", WEXITSTATUS(status));
1204
return false;
1205
}
1206
return true;
1207
}
1208
if(WIFSIGNALED(status)){
1209
fprintf_plus(stderr, "Error: iprouteadddel died by"
1210
" signal %d\n", WTERMSIG(status));
1211
return false;
1212
}
1213
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1214
return false;
1215
}
1216
1217
__attribute__((nonnull, warn_unused_result))
1218
static bool add_local_route(const char *address,
1219
AvahiIfIndex if_index){
1220
if(debug){
1221
fprintf_plus(stderr, "Adding route to %s\n", address);
1222
}
1223
return add_delete_local_route(true, address, if_index);
1224
}
1225
1226
__attribute__((nonnull, warn_unused_result))
1227
static bool delete_local_route(const char *address,
1228
AvahiIfIndex if_index){
1229
if(debug){
1230
fprintf_plus(stderr, "Removing route to %s\n", address);
1231
}
1232
return add_delete_local_route(false, address, if_index);
1233
}
1234
517
1235
/* Called when a Mandos server is found */
518
static int start_mandos_communication(const char *ip, uint16_t port,
1236
__attribute__((nonnull, warn_unused_result))
1237
static int start_mandos_communication(const char *ip, in_port_t port,
519
1238
AvahiIfIndex if_index,
520
int af){
521
int ret, tcp_sd;
1239
int af, mandos_context *mc){
1240
int ret, tcp_sd = -1;
522
1241
ssize_t sret;
523
union {
524
struct sockaddr_in in;
525
struct sockaddr_in6 in6;
526
} to;
1242
struct sockaddr_storage to;
527
1243
char *buffer = NULL;
528
char *decrypted_buffer;
1244
char *decrypted_buffer = NULL;
529
1245
size_t buffer_length = 0;
530
1246
size_t buffer_capacity = 0;
531
ssize_t decrypted_buffer_size;
532
1247
size_t written;
533
int retval = 0;
1248
int retval = -1;
534
1249
gnutls_session_t session;
535
1250
int pf; /* Protocol family */
1251
bool route_added = false;
1252
1253
errno = 0;
1254
1255
if(quit_now){
1256
errno = EINTR;
1257
return -1;
1258
}
536
1259
537
1260
switch(af){
538
1261
case AF_INET6:
542
1265
pf = PF_INET;
543
1266
break;
544
1267
default:
545
fprintf(stderr, "Bad address family: %d\n", af);
1268
fprintf_plus(stderr, "Bad address family: %d\n", af);
1269
errno = EINVAL;
546
1270
return -1;
547
1271
}
548
1272
549
ret = init_gnutls_session(&session);
1273
/* If the interface is specified and we have a list of interfaces */
1274
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1275
/* Check if the interface is one of the interfaces we are using */
1276
bool match = false;
1277
{
1278
char *interface = NULL;
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
1282
if(if_nametoindex(interface) == (unsigned int)if_index){
1283
match = true;
1284
break;
1285
}
1286
}
1287
}
1288
if(not match){
1289
/* This interface does not match any in the list, so we don't
1290
connect to the server */
1291
if(debug){
1292
char interface[IF_NAMESIZE];
1293
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1294
perror_plus("if_indextoname");
1295
} else {
1296
fprintf_plus(stderr, "Skipping server on non-used interface"
1297
" \"%s\"\n",
1298
if_indextoname((unsigned int)if_index,
1299
interface));
1300
}
1301
}
1302
return -1;
1303
}
1304
}
1305
1306
ret = init_gnutls_session(&session, mc);
550
1307
if(ret != 0){
551
1308
return -1;
552
1309
}
553
1310
554
1311
if(debug){
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
556
"\n", ip, port);
1312
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1313
PRIuMAX "\n", ip, (uintmax_t)port);
557
1314
}
558
1315
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
1316
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
560
1317
if(tcp_sd < 0){
561
perror("socket");
562
return -1;
563
}
564
565
memset(&to, 0, sizeof(to));
1318
int e = errno;
1319
perror_plus("socket");
1320
errno = e;
1321
goto mandos_end;
1322
}
1323
1324
if(quit_now){
1325
errno = EINTR;
1326
goto mandos_end;
1327
}
1328
566
1329
if(af == AF_INET6){
567
to.in6.sin6_family = (sa_family_t)af;
568
ret = inet_pton(af, ip, &to.in6.sin6_addr);
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);
569
1333
} else { /* IPv4 */
570
to.in.sin_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in.sin_addr);
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);
572
1337
}
573
1338
if(ret < 0 ){
574
perror("inet_pton");
575
return -1;
1339
int e = errno;
1340
perror_plus("inet_pton");
1341
errno = e;
1342
goto mandos_end;
576
1343
}
577
1344
if(ret == 0){
578
fprintf(stderr, "Bad address: %s\n", ip);
579
return -1;
1345
int e = errno;
1346
fprintf_plus(stderr, "Bad address: %s\n", ip);
1347
errno = e;
1348
goto mandos_end;
580
1349
}
581
1350
if(af == AF_INET6){
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
-Wconversion and
584
-Wunreachable-code */
585
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
588
-Wunreachable-code*/
1351
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1352
if(IN6_IS_ADDR_LINKLOCAL
1353
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
589
1354
if(if_index == AVAHI_IF_UNSPEC){
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
592
return -1;
1355
fprintf_plus(stderr, "An IPv6 link-local address is"
1356
" incomplete without a network interface\n");
1357
errno = EINVAL;
1358
goto mandos_end;
593
1359
}
594
1360
/* Set the network interface number as scope */
595
to.in6.sin6_scope_id = (uint32_t)if_index;
1361
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
596
1362
}
597
1363
} else {
598
to.in.sin_port = htons(port); /* Spurious warnings from
599
-Wconversion and
600
-Wunreachable-code */
1364
((struct sockaddr_in *)&to)->sin_port = htons(port);
1365
}
1366
1367
if(quit_now){
1368
errno = EINTR;
1369
goto mandos_end;
601
1370
}
602
1371
603
1372
if(debug){
604
1373
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
605
1374
char interface[IF_NAMESIZE];
606
1375
if(if_indextoname((unsigned int)if_index, interface) == NULL){
607
perror("if_indextoname");
1376
perror_plus("if_indextoname");
608
1377
} else {
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
1378
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1379
"\n", ip, interface, (uintmax_t)port);
611
1380
}
612
1381
} else {
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
1382
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1383
ip, (uintmax_t)port);
615
1384
}
616
1385
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
617
1386
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
const char *pcret;
619
if(af == AF_INET6){
620
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
sizeof(addrstr));
622
} else {
623
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
624
sizeof(addrstr));
625
}
626
if(pcret == NULL){
627
perror("inet_ntop");
628
} else {
629
if(strcmp(addrstr, ip) != 0){
630
fprintf(stderr, "Canonical address form: %s\n", addrstr);
631
}
632
}
633
}
634
635
if(af == AF_INET6){
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
637
} else {
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
639
}
640
if(ret < 0){
641
perror("connect");
642
return -1;
1387
if(af == AF_INET6){
1388
ret = getnameinfo((struct sockaddr *)&to,
1389
sizeof(struct sockaddr_in6),
1390
addrstr, sizeof(addrstr), NULL, 0,
1391
NI_NUMERICHOST);
1392
} else {
1393
ret = getnameinfo((struct sockaddr *)&to,
1394
sizeof(struct sockaddr_in),
1395
addrstr, sizeof(addrstr), NULL, 0,
1396
NI_NUMERICHOST);
1397
}
1398
if(ret == EAI_SYSTEM){
1399
perror_plus("getnameinfo");
1400
} else if(ret != 0) {
1401
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1402
} else if(strcmp(addrstr, ip) != 0){
1403
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1404
}
1405
}
1406
1407
if(quit_now){
1408
errno = EINTR;
1409
goto mandos_end;
1410
}
1411
1412
while(true){
1413
if(af == AF_INET6){
1414
ret = connect(tcp_sd, (struct sockaddr *)&to,
1415
sizeof(struct sockaddr_in6));
1416
} else {
1417
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1418
sizeof(struct sockaddr_in));
1419
}
1420
if(ret < 0){
1421
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1422
and if_index != AVAHI_IF_UNSPEC
1423
and connect_to == NULL
1424
and not route_added and
1425
((af == AF_INET6 and not
1426
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1427
&to)->sin6_addr)))
1428
or (af == AF_INET and
1429
/* Not a a IPv4LL address */
1430
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1431
& 0xFFFF0000L) != 0xA9FE0000L))){
1432
/* Work around Avahi bug - Avahi does not announce link-local
1433
addresses if it has a global address, so local hosts with
1434
*only* a link-local address (e.g. Mandos clients) cannot
1435
connect to a Mandos server announced by Avahi on a server
1436
host with a global address. Work around this by retrying
1437
with an explicit route added with the server's address.
1438
1439
Avahi bug reference:
1440
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1441
https://bugs.debian.org/587961
1442
*/
1443
if(debug){
1444
fprintf_plus(stderr, "Mandos server unreachable, trying"
1445
" direct route\n");
1446
}
1447
int e = errno;
1448
route_added = add_local_route(ip, if_index);
1449
if(route_added){
1450
continue;
1451
}
1452
errno = e;
1453
}
1454
if(errno != ECONNREFUSED or debug){
1455
int e = errno;
1456
perror_plus("connect");
1457
errno = e;
1458
}
1459
goto mandos_end;
1460
}
1461
1462
if(quit_now){
1463
errno = EINTR;
1464
goto mandos_end;
1465
}
1466
break;
643
1467
}
644
1468
645
1469
const char *out = mandos_protocol_version;
647
1471
while(true){
648
1472
size_t out_size = strlen(out);
649
1473
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
650
out_size - written));
1474
out_size - written));
651
1475
if(ret == -1){
652
perror("write");
653
retval = -1;
1476
int e = errno;
1477
perror_plus("write");
1478
errno = e;
654
1479
goto mandos_end;
655
1480
}
656
1481
written += (size_t)ret;
664
1489
break;
665
1490
}
666
1491
}
1492
1493
if(quit_now){
1494
errno = EINTR;
1495
goto mandos_end;
1496
}
667
1497
}
668
1498
669
1499
if(debug){
670
fprintf(stderr, "Establishing TLS session with %s\n", ip);
671
}
672
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
674
675
do{
1500
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1501
}
1502
1503
if(quit_now){
1504
errno = EINTR;
1505
goto mandos_end;
1506
}
1507
1508
/* This casting via intptr_t is to eliminate warning about casting
1509
an int to a pointer type. This is exactly how the GnuTLS Guile
1510
function "set-session-transport-fd!" does it. */
1511
gnutls_transport_set_ptr(session,
1512
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1513
1514
if(quit_now){
1515
errno = EINTR;
1516
goto mandos_end;
1517
}
1518
1519
do {
676
1520
ret = gnutls_handshake(session);
1521
if(quit_now){
1522
errno = EINTR;
1523
goto mandos_end;
1524
}
677
1525
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
678
1526
679
1527
if(ret != GNUTLS_E_SUCCESS){
680
1528
if(debug){
681
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1529
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
682
1530
gnutls_perror(ret);
683
1531
}
684
retval = -1;
1532
errno = EPROTO;
685
1533
goto mandos_end;
686
1534
}
687
1535
688
1536
/* Read OpenPGP packet that contains the wanted password */
689
1537
690
1538
if(debug){
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
692
ip);
1539
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1540
" %s\n", ip);
693
1541
}
694
1542
695
1543
while(true){
1544
1545
if(quit_now){
1546
errno = EINTR;
1547
goto mandos_end;
1548
}
1549
696
1550
buffer_capacity = incbuffer(&buffer, buffer_length,
697
buffer_capacity);
1551
buffer_capacity);
698
1552
if(buffer_capacity == 0){
699
perror("incbuffer");
700
retval = -1;
1553
int e = errno;
1554
perror_plus("incbuffer");
1555
errno = e;
1556
goto mandos_end;
1557
}
1558
1559
if(quit_now){
1560
errno = EINTR;
701
1561
goto mandos_end;
702
1562
}
703
1563
712
1572
case GNUTLS_E_AGAIN:
713
1573
break;
714
1574
case GNUTLS_E_REHANDSHAKE:
715
do{
1575
do {
716
1576
ret = gnutls_handshake(session);
1577
1578
if(quit_now){
1579
errno = EINTR;
1580
goto mandos_end;
1581
}
717
1582
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
718
1583
if(ret < 0){
719
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1584
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1585
"***\n");
720
1586
gnutls_perror(ret);
721
retval = -1;
1587
errno = EPROTO;
722
1588
goto mandos_end;
723
1589
}
724
1590
break;
725
1591
default:
726
fprintf(stderr, "Unknown error while reading data from"
727
" encrypted session with Mandos server\n");
728
retval = -1;
1592
fprintf_plus(stderr, "Unknown error while reading data from"
1593
" encrypted session with Mandos server\n");
729
1594
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1595
errno = EIO;
730
1596
goto mandos_end;
731
1597
}
732
1598
} else {
735
1601
}
736
1602
737
1603
if(debug){
738
fprintf(stderr, "Closing TLS session\n");
739
}
740
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1604
fprintf_plus(stderr, "Closing TLS session\n");
1605
}
1606
1607
if(quit_now){
1608
errno = EINTR;
1609
goto mandos_end;
1610
}
1611
1612
do {
1613
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1614
if(quit_now){
1615
errno = EINTR;
1616
goto mandos_end;
1617
}
1618
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
742
1619
743
1620
if(buffer_length > 0){
744
decrypted_buffer_size = pgp_packet_decrypt(buffer,
745
buffer_length,
746
&decrypted_buffer);
1621
ssize_t decrypted_buffer_size;
1622
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1623
&decrypted_buffer, mc);
747
1624
if(decrypted_buffer_size >= 0){
1625
1626
clearerr(stdout);
748
1627
written = 0;
749
1628
while(written < (size_t) decrypted_buffer_size){
1629
if(quit_now){
1630
errno = EINTR;
1631
goto mandos_end;
1632
}
1633
750
1634
ret = (int)fwrite(decrypted_buffer + written, 1,
751
1635
(size_t)decrypted_buffer_size - written,
752
1636
stdout);
753
1637
if(ret == 0 and ferror(stdout)){
1638
int e = errno;
754
1639
if(debug){
755
fprintf(stderr, "Error writing encrypted data: %s\n",
756
strerror(errno));
1640
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1641
strerror(errno));
757
1642
}
758
retval = -1;
759
break;
1643
errno = e;
1644
goto mandos_end;
760
1645
}
761
1646
written += (size_t)ret;
762
1647
}
763
free(decrypted_buffer);
764
} else {
765
retval = -1;
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
retval = 0;
766
1659
}
767
} else {
768
retval = -1;
769
1660
}
770
1661
771
1662
/* Shutdown procedure */
772
1663
773
1664
mandos_end:
774
free(buffer);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
776
if(ret == -1){
777
perror("close");
1665
{
1666
if(route_added){
1667
if(not delete_local_route(ip, if_index)){
1668
fprintf_plus(stderr, "Failed to delete local route to %s on"
1669
" interface %d", ip, if_index);
1670
}
1671
}
1672
int e = errno;
1673
free(decrypted_buffer);
1674
free(buffer);
1675
if(tcp_sd >= 0){
1676
ret = close(tcp_sd);
1677
}
1678
if(ret == -1){
1679
if(e == 0){
1680
e = errno;
1681
}
1682
perror_plus("close");
1683
}
1684
gnutls_deinit(session);
1685
errno = e;
1686
if(quit_now){
1687
errno = EINTR;
1688
retval = -1;
1689
}
778
1690
}
779
gnutls_deinit(session);
780
1691
return retval;
781
1692
}
782
1693
783
sig_atomic_t quit_now = 0;
784
785
1694
static void resolve_callback(AvahiSServiceResolver *r,
786
1695
AvahiIfIndex interface,
787
1696
AvahiProtocol proto,
795
1704
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
1705
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
1706
flags,
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
1707
void *mc){
1708
if(r == NULL){
1709
return;
1710
}
800
1711
801
1712
/* Called whenever a service has been resolved successfully or
802
1713
timed out */
803
1714
804
1715
if(quit_now){
1716
avahi_s_service_resolver_free(r);
805
1717
return;
806
1718
}
807
1719
808
1720
switch(event){
809
1721
default:
810
1722
case AVAHI_RESOLVER_FAILURE:
811
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
812
" of type '%s' in domain '%s': %s\n", name, type, domain,
813
avahi_strerror(avahi_server_errno(mc.server)));
1723
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1724
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1725
domain,
1726
avahi_strerror(avahi_server_errno
1727
(((mandos_context*)mc)->server)));
814
1728
break;
815
1729
816
1730
case AVAHI_RESOLVER_FOUND:
818
1732
char ip[AVAHI_ADDRESS_STR_MAX];
819
1733
avahi_address_snprint(ip, sizeof(ip), address);
820
1734
if(debug){
821
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
822
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
823
ip, (intmax_t)interface, port);
1735
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1736
PRIdMAX ") on port %" PRIu16 "\n", name,
1737
host_name, ip, (intmax_t)interface, port);
824
1738
}
825
int ret = start_mandos_communication(ip, port, interface,
826
avahi_proto_to_af(proto));
1739
int ret = start_mandos_communication(ip, (in_port_t)port,
1740
interface,
1741
avahi_proto_to_af(proto),
1742
mc);
827
1743
if(ret == 0){
828
avahi_simple_poll_quit(mc.simple_poll);
1744
avahi_simple_poll_quit(simple_poll);
1745
} else {
1746
if(not add_server(ip, (in_port_t)port, interface,
1747
avahi_proto_to_af(proto),
1748
&((mandos_context*)mc)->current_server)){
1749
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1750
" list\n", name);
1751
}
829
1752
}
830
1753
}
831
1754
}
841
1764
const char *domain,
842
1765
AVAHI_GCC_UNUSED AvahiLookupResultFlags
843
1766
flags,
844
AVAHI_GCC_UNUSED void* userdata){
845
assert(b);
1767
void *mc){
1768
if(b == NULL){
1769
return;
1770
}
846
1771
847
1772
/* Called whenever a new services becomes available on the LAN or
848
1773
is removed from the LAN */
849
1774
1775
if(quit_now){
1776
return;
1777
}
1778
850
1779
switch(event){
851
1780
default:
852
1781
case AVAHI_BROWSER_FAILURE:
853
1782
854
fprintf(stderr, "(Avahi browser) %s\n",
855
avahi_strerror(avahi_server_errno(mc.server)));
856
avahi_simple_poll_quit(mc.simple_poll);
1783
fprintf_plus(stderr, "(Avahi browser) %s\n",
1784
avahi_strerror(avahi_server_errno
1785
(((mandos_context*)mc)->server)));
1786
avahi_simple_poll_quit(simple_poll);
857
1787
return;
858
1788
859
1789
case AVAHI_BROWSER_NEW:
862
1792
the callback function is called the Avahi server will free the
863
1793
resolver for us. */
864
1794
865
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
866
name, type, domain, protocol, 0,
867
resolve_callback, NULL) == NULL)
868
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
869
name, avahi_strerror(avahi_server_errno(mc.server)));
1795
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1796
interface, protocol, name, type,
1797
domain, protocol, 0,
1798
resolve_callback, mc) == NULL)
1799
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1800
" %s\n", name,
1801
avahi_strerror(avahi_server_errno
1802
(((mandos_context*)mc)->server)));
870
1803
break;
871
1804
872
1805
case AVAHI_BROWSER_REMOVE:
875
1808
case AVAHI_BROWSER_ALL_FOR_NOW:
876
1809
case AVAHI_BROWSER_CACHE_EXHAUSTED:
877
1810
if(debug){
878
fprintf(stderr, "No Mandos server found, still searching...\n");
1811
fprintf_plus(stderr, "No Mandos server found, still"
1812
" searching...\n");
879
1813
}
880
1814
break;
881
1815
}
882
1816
}
883
1817
884
/* stop main loop after sigterm has been called */
885
static void handle_sigterm(__attribute__((unused)) int sig){
1818
/* Signal handler that stops main loop after SIGTERM */
1819
static void handle_sigterm(int sig){
886
1820
if(quit_now){
887
1821
return;
888
1822
}
889
1823
quit_now = 1;
890
int old_errno = errno;
891
if(mc.simple_poll != NULL){
892
avahi_simple_poll_quit(mc.simple_poll);
893
}
894
errno = old_errno;
1824
signal_received = sig;
1825
int old_errno = errno;
1826
/* set main loop to exit */
1827
if(simple_poll != NULL){
1828
avahi_simple_poll_quit(simple_poll);
1829
}
1830
errno = old_errno;
1831
}
1832
1833
__attribute__((nonnull, warn_unused_result))
1834
bool get_flags(const char *ifname, struct ifreq *ifr){
1835
int ret;
1836
int old_errno;
1837
1838
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1839
if(s < 0){
1840
old_errno = errno;
1841
perror_plus("socket");
1842
errno = old_errno;
1843
return false;
1844
}
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1847
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1848
if(ret == -1){
1849
if(debug){
1850
old_errno = errno;
1851
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;
1858
}
1859
return false;
1860
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1866
return true;
1867
}
1868
1869
__attribute__((nonnull, warn_unused_result))
1870
bool good_flags(const char *ifname, const struct ifreq *ifr){
1871
1872
/* Reject the loopback device */
1873
if(ifr->ifr_flags & IFF_LOOPBACK){
1874
if(debug){
1875
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1876
ifname);
1877
}
1878
return false;
1879
}
1880
/* Accept point-to-point devices only if connect_to is specified */
1881
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1882
if(debug){
1883
fprintf_plus(stderr, "Accepting point-to-point interface"
1884
" \"%s\"\n", ifname);
1885
}
1886
return true;
1887
}
1888
/* Otherwise, reject non-broadcast-capable devices */
1889
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1890
if(debug){
1891
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1892
" \"%s\"\n", ifname);
1893
}
1894
return false;
1895
}
1896
/* Reject non-ARP interfaces (including dummy interfaces) */
1897
if(ifr->ifr_flags & IFF_NOARP){
1898
if(debug){
1899
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1900
ifname);
1901
}
1902
return false;
1903
}
1904
1905
/* Accept this device */
1906
if(debug){
1907
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1908
}
1909
return true;
1910
}
1911
1912
/*
1913
* This function determines if a directory entry in /sys/class/net
1914
* corresponds to an acceptable network device.
1915
* (This function is passed to scandir(3) as a filter function.)
1916
*/
1917
__attribute__((nonnull, warn_unused_result))
1918
int good_interface(const struct dirent *if_entry){
1919
if(if_entry->d_name[0] == '.'){
1920
return 0;
1921
}
1922
1923
struct ifreq ifr;
1924
if(not get_flags(if_entry->d_name, &ifr)){
1925
if(debug){
1926
fprintf_plus(stderr, "Failed to get flags for interface "
1927
"\"%s\"\n", if_entry->d_name);
1928
}
1929
return 0;
1930
}
1931
1932
if(not good_flags(if_entry->d_name, &ifr)){
1933
return 0;
1934
}
1935
return 1;
1936
}
1937
1938
/*
1939
* This function determines if a network interface is up.
1940
*/
1941
__attribute__((nonnull, warn_unused_result))
1942
bool interface_is_up(const char *interface){
1943
struct ifreq ifr;
1944
if(not get_flags(interface, &ifr)){
1945
if(debug){
1946
fprintf_plus(stderr, "Failed to get flags for interface "
1947
"\"%s\"\n", interface);
1948
}
1949
return false;
1950
}
1951
1952
return (bool)(ifr.ifr_flags & IFF_UP);
1953
}
1954
1955
/*
1956
* This function determines if a network interface is running
1957
*/
1958
__attribute__((nonnull, warn_unused_result))
1959
bool interface_is_running(const char *interface){
1960
struct ifreq ifr;
1961
if(not get_flags(interface, &ifr)){
1962
if(debug){
1963
fprintf_plus(stderr, "Failed to get flags for interface "
1964
"\"%s\"\n", interface);
1965
}
1966
return false;
1967
}
1968
1969
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1970
}
1971
1972
__attribute__((nonnull, pure, warn_unused_result))
1973
int notdotentries(const struct dirent *direntry){
1974
/* Skip "." and ".." */
1975
if(direntry->d_name[0] == '.'
1976
and (direntry->d_name[1] == '\0'
1977
or (direntry->d_name[1] == '.'
1978
and direntry->d_name[2] == '\0'))){
1979
return 0;
1980
}
1981
return 1;
1982
}
1983
1984
/* Is this directory entry a runnable program? */
1985
__attribute__((nonnull, warn_unused_result))
1986
int runnable_hook(const struct dirent *direntry){
1987
int ret;
1988
size_t sret;
1989
struct stat st;
1990
1991
if((direntry->d_name)[0] == '\0'){
1992
/* Empty name? */
1993
return 0;
1994
}
1995
1996
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1997
"abcdefghijklmnopqrstuvwxyz"
1998
"0123456789"
1999
"_.-");
2000
if((direntry->d_name)[sret] != '\0'){
2001
/* Contains non-allowed characters */
2002
if(debug){
2003
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
2004
direntry->d_name);
2005
}
2006
return 0;
2007
}
2008
2009
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
2010
if(ret == -1){
2011
if(debug){
2012
perror_plus("Could not stat hook");
2013
}
2014
return 0;
2015
}
2016
if(not (S_ISREG(st.st_mode))){
2017
/* Not a regular file */
2018
if(debug){
2019
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
2020
direntry->d_name);
2021
}
2022
return 0;
2023
}
2024
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
2025
/* Not executable */
2026
if(debug){
2027
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
2028
direntry->d_name);
2029
}
2030
return 0;
2031
}
2032
if(debug){
2033
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
2034
direntry->d_name);
2035
}
2036
return 1;
2037
}
2038
2039
__attribute__((nonnull, warn_unused_result))
2040
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2041
mandos_context *mc){
2042
int ret;
2043
struct timespec now;
2044
struct timespec waited_time;
2045
intmax_t block_time;
2046
2047
while(true){
2048
if(mc->current_server == NULL){
2049
if(debug){
2050
fprintf_plus(stderr, "Wait until first server is found."
2051
" No timeout!\n");
2052
}
2053
ret = avahi_simple_poll_iterate(s, -1);
2054
} else {
2055
if(debug){
2056
fprintf_plus(stderr, "Check current_server if we should run"
2057
" it, or wait\n");
2058
}
2059
/* the current time */
2060
ret = clock_gettime(CLOCK_MONOTONIC, &now);
2061
if(ret == -1){
2062
perror_plus("clock_gettime");
2063
return -1;
2064
}
2065
/* Calculating in ms how long time between now and server
2066
who we visted longest time ago. Now - last seen. */
2067
waited_time.tv_sec = (now.tv_sec
2068
- mc->current_server->last_seen.tv_sec);
2069
waited_time.tv_nsec = (now.tv_nsec
2070
- mc->current_server->last_seen.tv_nsec);
2071
/* total time is 10s/10,000ms.
2072
Converting to s from ms by dividing by 1,000,
2073
and ns to ms by dividing by 1,000,000. */
2074
block_time = ((retry_interval
2075
- ((intmax_t)waited_time.tv_sec * 1000))
2076
- ((intmax_t)waited_time.tv_nsec / 1000000));
2077
2078
if(debug){
2079
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2080
block_time);
2081
}
2082
2083
if(block_time <= 0){
2084
ret = start_mandos_communication(mc->current_server->ip,
2085
mc->current_server->port,
2086
mc->current_server->if_index,
2087
mc->current_server->af, mc);
2088
if(ret == 0){
2089
avahi_simple_poll_quit(s);
2090
return 0;
2091
}
2092
ret = clock_gettime(CLOCK_MONOTONIC,
2093
&mc->current_server->last_seen);
2094
if(ret == -1){
2095
perror_plus("clock_gettime");
2096
return -1;
2097
}
2098
mc->current_server = mc->current_server->next;
2099
block_time = 0; /* Call avahi to find new Mandos
2100
servers, but don't block */
2101
}
2102
2103
ret = avahi_simple_poll_iterate(s, (int)block_time);
2104
}
2105
if(ret != 0){
2106
if(ret > 0 or errno != EINTR){
2107
return (ret != 1) ? ret : 0;
2108
}
2109
}
2110
}
2111
}
2112
2113
__attribute__((nonnull))
2114
void run_network_hooks(const char *mode, const char *interface,
2115
const float delay){
2116
struct dirent **direntries = NULL;
2117
if(hookdir_fd == -1){
2118
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2119
| O_CLOEXEC);
2120
if(hookdir_fd == -1){
2121
if(errno == ENOENT){
2122
if(debug){
2123
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2124
" found\n", hookdir);
2125
}
2126
} else {
2127
perror_plus("open");
2128
}
2129
return;
2130
}
2131
}
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
}
2137
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2138
runnable_hook, alphasort);
2139
if(numhooks == -1){
2140
perror_plus("scandir");
2141
close(devnull);
2142
return;
2143
}
2144
struct dirent *direntry;
2145
int ret;
2146
for(int i = 0; i < numhooks; i++){
2147
direntry = direntries[i];
2148
if(debug){
2149
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2150
direntry->d_name);
2151
}
2152
pid_t hook_pid = fork();
2153
if(hook_pid == 0){
2154
/* Child */
2155
/* Raise privileges */
2156
errno = raise_privileges_permanently();
2157
if(errno != 0){
2158
perror_plus("Failed to raise privileges");
2159
_exit(EX_NOPERM);
2160
}
2161
/* Set group */
2162
errno = 0;
2163
ret = setgid(0);
2164
if(ret == -1){
2165
perror_plus("setgid");
2166
_exit(EX_NOPERM);
2167
}
2168
/* Reset supplementary groups */
2169
errno = 0;
2170
ret = setgroups(0, NULL);
2171
if(ret == -1){
2172
perror_plus("setgroups");
2173
_exit(EX_NOPERM);
2174
}
2175
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2176
if(ret == -1){
2177
perror_plus("setenv");
2178
_exit(EX_OSERR);
2179
}
2180
ret = setenv("DEVICE", interface, 1);
2181
if(ret == -1){
2182
perror_plus("setenv");
2183
_exit(EX_OSERR);
2184
}
2185
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2186
if(ret == -1){
2187
perror_plus("setenv");
2188
_exit(EX_OSERR);
2189
}
2190
ret = setenv("MODE", mode, 1);
2191
if(ret == -1){
2192
perror_plus("setenv");
2193
_exit(EX_OSERR);
2194
}
2195
char *delaystring;
2196
ret = asprintf(&delaystring, "%f", (double)delay);
2197
if(ret == -1){
2198
perror_plus("asprintf");
2199
_exit(EX_OSERR);
2200
}
2201
ret = setenv("DELAY", delaystring, 1);
2202
if(ret == -1){
2203
free(delaystring);
2204
perror_plus("setenv");
2205
_exit(EX_OSERR);
2206
}
2207
free(delaystring);
2208
if(connect_to != NULL){
2209
ret = setenv("CONNECT", connect_to, 1);
2210
if(ret == -1){
2211
perror_plus("setenv");
2212
_exit(EX_OSERR);
2213
}
2214
}
2215
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2216
direntry->d_name,
2217
O_RDONLY));
2218
if(hook_fd == -1){
2219
perror_plus("openat");
2220
_exit(EXIT_FAILURE);
2221
}
2222
if(close(hookdir_fd) == -1){
2223
perror_plus("close");
2224
_exit(EXIT_FAILURE);
2225
}
2226
ret = dup2(devnull, STDIN_FILENO);
2227
if(ret == -1){
2228
perror_plus("dup2(devnull, STDIN_FILENO)");
2229
_exit(EX_OSERR);
2230
}
2231
ret = close(devnull);
2232
if(ret == -1){
2233
perror_plus("close");
2234
_exit(EX_OSERR);
2235
}
2236
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2237
if(ret == -1){
2238
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2239
_exit(EX_OSERR);
2240
}
2241
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2242
environ) == -1){
2243
perror_plus("fexecve");
2244
_exit(EXIT_FAILURE);
2245
}
2246
} else {
2247
if(hook_pid == -1){
2248
perror_plus("fork");
2249
free(direntry);
2250
continue;
2251
}
2252
int status;
2253
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2254
perror_plus("waitpid");
2255
free(direntry);
2256
continue;
2257
}
2258
if(WIFEXITED(status)){
2259
if(WEXITSTATUS(status) != 0){
2260
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2261
" with status %d\n", direntry->d_name,
2262
WEXITSTATUS(status));
2263
free(direntry);
2264
continue;
2265
}
2266
} else if(WIFSIGNALED(status)){
2267
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2268
" signal %d\n", direntry->d_name,
2269
WTERMSIG(status));
2270
free(direntry);
2271
continue;
2272
} else {
2273
fprintf_plus(stderr, "Warning: network hook \"%s\""
2274
" crashed\n", direntry->d_name);
2275
free(direntry);
2276
continue;
2277
}
2278
}
2279
if(debug){
2280
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2281
direntry->d_name);
2282
}
2283
free(direntry);
2284
}
2285
free(direntries);
2286
if(close(hookdir_fd) == -1){
2287
perror_plus("close");
2288
} else {
2289
hookdir_fd = -1;
2290
}
2291
close(devnull);
2292
}
2293
2294
__attribute__((nonnull, warn_unused_result))
2295
int bring_up_interface(const char *const interface,
2296
const float delay){
2297
int old_errno = errno;
2298
int ret;
2299
struct ifreq network;
2300
unsigned int if_index = if_nametoindex(interface);
2301
if(if_index == 0){
2302
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2303
errno = old_errno;
2304
return ENXIO;
2305
}
2306
2307
if(quit_now){
2308
errno = old_errno;
2309
return EINTR;
2310
}
2311
2312
if(not interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network)){
2316
ret_errno = errno;
2317
fprintf_plus(stderr, "Failed to get flags for interface "
2318
"\"%s\"\n", interface);
2319
errno = old_errno;
2320
return ret_errno;
2321
}
2322
network.ifr_flags |= IFF_UP; /* set flag */
2323
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
2326
ret_errno = errno;
2327
perror_plus("socket");
2328
errno = old_errno;
2329
return ret_errno;
2330
}
2331
2332
if(quit_now){
2333
ret = close(sd);
2334
if(ret == -1){
2335
perror_plus("close");
2336
}
2337
errno = old_errno;
2338
return EINTR;
2339
}
2340
2341
if(debug){
2342
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2343
interface);
2344
}
2345
2346
/* Raise privileges */
2347
ret_errno = raise_privileges();
2348
if(ret_errno != 0){
2349
errno = ret_errno;
2350
perror_plus("Failed to raise privileges");
2351
}
2352
2353
#ifdef __linux__
2354
int ret_linux;
2355
bool restore_loglevel = false;
2356
if(ret_errno == 0){
2357
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2358
messages about the network interface to mess up the prompt */
2359
ret_linux = klogctl(8, NULL, 5);
2360
if(ret_linux == -1){
2361
perror_plus("klogctl");
2362
} else {
2363
restore_loglevel = true;
2364
}
2365
}
2366
#endif /* __linux__ */
2367
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2368
ioctl_errno = errno;
2369
#ifdef __linux__
2370
if(restore_loglevel){
2371
ret_linux = klogctl(7, NULL, 0);
2372
if(ret_linux == -1){
2373
perror_plus("klogctl");
2374
}
2375
}
2376
#endif /* __linux__ */
2377
2378
/* If raise_privileges() succeeded above */
2379
if(ret_errno == 0){
2380
/* Lower privileges */
2381
ret_errno = lower_privileges();
2382
if(ret_errno != 0){
2383
errno = ret_errno;
2384
perror_plus("Failed to lower privileges");
2385
}
2386
}
2387
2388
/* Close the socket */
2389
ret = close(sd);
2390
if(ret == -1){
2391
perror_plus("close");
2392
}
2393
2394
if(ret_setflags == -1){
2395
errno = ioctl_errno;
2396
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2397
errno = old_errno;
2398
return ioctl_errno;
2399
}
2400
} else if(debug){
2401
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2402
interface);
2403
}
2404
2405
/* Sleep checking until interface is running.
2406
Check every 0.25s, up to total time of delay */
2407
for(int i = 0; i < delay * 4; i++){
2408
if(interface_is_running(interface)){
2409
break;
2410
}
2411
struct timespec sleeptime = { .tv_nsec = 250000000 };
2412
ret = nanosleep(&sleeptime, NULL);
2413
if(ret == -1 and errno != EINTR){
2414
perror_plus("nanosleep");
2415
}
2416
}
2417
2418
errno = old_errno;
2419
return 0;
2420
}
2421
2422
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
2425
struct ifreq network;
2426
unsigned int if_index = if_nametoindex(interface);
2427
if(if_index == 0){
2428
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2429
errno = old_errno;
2430
return ENXIO;
2431
}
2432
if(interface_is_up(interface)){
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
2435
if(not get_flags(interface, &network) and debug){
2436
ret_errno = errno;
2437
fprintf_plus(stderr, "Failed to get flags for interface "
2438
"\"%s\"\n", interface);
2439
errno = old_errno;
2440
return ret_errno;
2441
}
2442
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2443
2444
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2445
if(sd == -1){
2446
ret_errno = errno;
2447
perror_plus("socket");
2448
errno = old_errno;
2449
return ret_errno;
2450
}
2451
2452
if(debug){
2453
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2454
interface);
2455
}
2456
2457
/* Raise privileges */
2458
ret_errno = raise_privileges();
2459
if(ret_errno != 0){
2460
errno = ret_errno;
2461
perror_plus("Failed to raise privileges");
2462
}
2463
2464
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2465
ioctl_errno = errno;
2466
2467
/* If raise_privileges() succeeded above */
2468
if(ret_errno == 0){
2469
/* Lower privileges */
2470
ret_errno = lower_privileges();
2471
if(ret_errno != 0){
2472
errno = ret_errno;
2473
perror_plus("Failed to lower privileges");
2474
}
2475
}
2476
2477
/* Close the socket */
2478
int ret = close(sd);
2479
if(ret == -1){
2480
perror_plus("close");
2481
}
2482
2483
if(ret_setflags == -1){
2484
errno = ioctl_errno;
2485
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2486
errno = old_errno;
2487
return ioctl_errno;
2488
}
2489
} else if(debug){
2490
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2491
interface);
2492
}
2493
2494
errno = old_errno;
2495
return 0;
895
2496
}
896
2497
897
2498
int main(int argc, char *argv[]){
2499
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 };
898
2512
AvahiSServiceBrowser *sb = NULL;
899
int error;
2513
error_t ret_errno;
900
2514
int ret;
901
2515
intmax_t tmpmax;
902
2516
char *tmp;
903
2517
int exitcode = EXIT_SUCCESS;
904
const char *interface = "eth0";
905
struct ifreq network;
906
int sd = -1;
907
bool take_down_interface = false;
908
uid_t uid;
909
gid_t gid;
910
char *connect_to = NULL;
911
char tempdir[] = "/tmp/mandosXXXXXX";
912
bool tempdir_created = false;
2518
char *interfaces_to_take_down = NULL;
2519
size_t interfaces_to_take_down_size = 0;
2520
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2521
char old_tempdir[] = "/tmp/mandosXXXXXX";
2522
char *tempdir = NULL;
913
2523
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
914
2524
const char *seckey = PATHDIR "/" SECKEY;
915
2525
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
const char *dh_params_file = NULL;
2531
char *interfaces_hooks = NULL;
916
2532
917
2533
bool gnutls_initialized = false;
918
2534
bool gpgme_initialized = false;
919
2535
float delay = 2.5f;
2536
double retry_interval = 10; /* 10s between trying a server and
2537
retrying the same server again */
920
2538
921
struct sigaction old_sigterm_action;
2539
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
922
2540
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
923
2541
2542
uid = getuid();
2543
gid = getgid();
2544
2545
/* Lower any group privileges we might have, just to be safe */
2546
errno = 0;
2547
ret = setgid(gid);
2548
if(ret == -1){
2549
perror_plus("setgid");
2550
}
2551
2552
/* Lower user privileges (temporarily) */
2553
errno = 0;
2554
ret = seteuid(uid);
2555
if(ret == -1){
2556
perror_plus("seteuid");
2557
}
2558
2559
if(quit_now){
2560
goto end;
2561
}
2562
924
2563
{
925
2564
struct argp_option options[] = {
926
2565
{ .name = "debug", .key = 128,
941
2580
{ .name = "pubkey", .key = 'p',
942
2581
.arg = "FILE",
943
2582
.doc = "OpenPGP public key file base name",
944
.group = 2 },
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 },
945
2600
{ .name = "dh-bits", .key = 129,
946
2601
.arg = "BITS",
947
2602
.doc = "Bit length of the prime number used in the"
948
2603
" Diffie-Hellman key exchange",
949
2604
.group = 2 },
2605
{ .name = "dh-params", .key = 134,
2606
.arg = "FILE",
2607
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2608
" for the Diffie-Hellman key exchange",
2609
.group = 2 },
950
2610
{ .name = "priority", .key = 130,
951
2611
.arg = "STRING",
952
2612
.doc = "GnuTLS priority string for the TLS handshake",
955
2615
.arg = "SECONDS",
956
2616
.doc = "Maximum delay to wait for interface startup",
957
2617
.group = 2 },
2618
{ .name = "retry", .key = 132,
2619
.arg = "SECONDS",
2620
.doc = "Retry interval used when denied by the Mandos server",
2621
.group = 2 },
2622
{ .name = "network-hook-dir", .key = 133,
2623
.arg = "DIR",
2624
.doc = "Directory where network hooks are located",
2625
.group = 2 },
2626
/*
2627
* These reproduce what we would get without ARGP_NO_HELP
2628
*/
2629
{ .name = "help", .key = '?',
2630
.doc = "Give this help list", .group = -1 },
2631
{ .name = "usage", .key = -3,
2632
.doc = "Give a short usage message", .group = -1 },
2633
{ .name = "version", .key = 'V',
2634
.doc = "Print program version", .group = -1 },
958
2635
{ .name = NULL }
959
2636
};
960
2637
961
2638
error_t parse_opt(int key, char *arg,
962
2639
struct argp_state *state){
2640
errno = 0;
963
2641
switch(key){
964
2642
case 128: /* --debug */
965
2643
debug = true;
968
2646
connect_to = arg;
969
2647
break;
970
2648
case 'i': /* --interface */
971
interface = arg;
2649
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2650
arg, (int)',');
2651
if(ret_errno != 0){
2652
argp_error(state, "%s", strerror(ret_errno));
2653
}
972
2654
break;
973
2655
case 's': /* --seckey */
974
2656
seckey = arg;
976
2658
case 'p': /* --pubkey */
977
2659
pubkey = arg;
978
2660
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;
979
2671
case 129: /* --dh-bits */
980
2672
errno = 0;
981
2673
tmpmax = strtoimax(arg, &tmp, 10);
982
2674
if(errno != 0 or tmp == arg or *tmp != '\0'
983
2675
or tmpmax != (typeof(mc.dh_bits))tmpmax){
984
fprintf(stderr, "Bad number of DH bits\n");
985
exit(EXIT_FAILURE);
2676
argp_error(state, "Bad number of DH bits");
986
2677
}
987
2678
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
988
2679
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
989
2683
case 130: /* --priority */
990
2684
mc.priority = arg;
991
2685
break;
993
2687
errno = 0;
994
2688
delay = strtof(arg, &tmp);
995
2689
if(errno != 0 or tmp == arg or *tmp != '\0'){
996
fprintf(stderr, "Bad delay\n");
997
exit(EXIT_FAILURE);
998
}
999
break;
1000
case ARGP_KEY_ARG:
1001
argp_usage(state);
1002
case ARGP_KEY_END:
2690
argp_error(state, "Bad delay");
2691
}
2692
case 132: /* --retry */
2693
errno = 0;
2694
retry_interval = strtod(arg, &tmp);
2695
if(errno != 0 or tmp == arg or *tmp != '\0'
2696
or (retry_interval * 1000) > INT_MAX
2697
or retry_interval < 0){
2698
argp_error(state, "Bad retry interval");
2699
}
2700
break;
2701
case 133: /* --network-hook-dir */
2702
hookdir = arg;
2703
break;
2704
/*
2705
* These reproduce what we would get without ARGP_NO_HELP
2706
*/
2707
case '?': /* --help */
2708
argp_state_help(state, state->out_stream,
2709
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2710
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2712
case -3: /* --usage */
2713
argp_state_help(state, state->out_stream,
2714
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2716
case 'V': /* --version */
2717
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2718
exit(argp_err_exit_status);
1003
2719
break;
1004
2720
default:
1005
2721
return ARGP_ERR_UNKNOWN;
1006
2722
}
1007
return 0;
2723
return errno;
1008
2724
}
1009
2725
1010
2726
struct argp argp = { .options = options, .parser = parse_opt,
1011
2727
.args_doc = "",
1012
2728
.doc = "Mandos client -- Get and decrypt"
1013
2729
" passwords from a Mandos server" };
1014
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1015
if(ret == ARGP_ERR_UNKNOWN){
1016
fprintf(stderr, "Unknown error while parsing arguments\n");
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
2730
ret_errno = argp_parse(&argp, argc, argv,
2731
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2732
switch(ret_errno){
2733
case 0:
2734
break;
2735
case ENOMEM:
2736
default:
2737
errno = ret_errno;
2738
perror_plus("argp_parse");
2739
exitcode = EX_OSERR;
2740
goto end;
2741
case EINVAL:
2742
exitcode = EX_USAGE;
2743
goto end;
2744
}
2745
}
2746
2747
{
2748
/* Re-raise privileges */
2749
ret = raise_privileges();
2750
if(ret != 0){
2751
errno = ret;
2752
perror_plus("Failed to raise privileges");
2753
} else {
2754
struct stat st;
2755
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2759
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2760
int seckey_fd = open(seckey, O_RDONLY);
2761
if(seckey_fd == -1){
2762
perror_plus("open");
2763
} else {
2764
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2765
if(ret == -1){
2766
perror_plus("fstat");
2767
} else {
2768
if(S_ISREG(st.st_mode)
2769
and st.st_uid == 0 and st.st_gid == 0){
2770
ret = fchown(seckey_fd, uid, gid);
2771
if(ret == -1){
2772
perror_plus("fchown");
2773
}
2774
}
2775
}
2776
close(seckey_fd);
2777
}
2778
}
2779
2780
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2781
int pubkey_fd = open(pubkey, O_RDONLY);
2782
if(pubkey_fd == -1){
2783
perror_plus("open");
2784
} else {
2785
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2786
if(ret == -1){
2787
perror_plus("fstat");
2788
} else {
2789
if(S_ISREG(st.st_mode)
2790
and st.st_uid == 0 and st.st_gid == 0){
2791
ret = fchown(pubkey_fd, uid, gid);
2792
if(ret == -1){
2793
perror_plus("fchown");
2794
}
2795
}
2796
}
2797
close(pubkey_fd);
2798
}
2799
}
2800
2801
if(dh_params_file != NULL
2802
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2803
int dhparams_fd = open(dh_params_file, O_RDONLY);
2804
if(dhparams_fd == -1){
2805
perror_plus("open");
2806
} else {
2807
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2808
if(ret == -1){
2809
perror_plus("fstat");
2810
} else {
2811
if(S_ISREG(st.st_mode)
2812
and st.st_uid == 0 and st.st_gid == 0){
2813
ret = fchown(dhparams_fd, uid, gid);
2814
if(ret == -1){
2815
perror_plus("fchown");
2816
}
2817
}
2818
}
2819
close(dhparams_fd);
2820
}
2821
}
2822
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
/* Lower privileges */
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2836
perror_plus("Failed to lower privileges");
2837
}
2838
}
2839
}
2840
2841
/* Remove invalid interface names (except "none") */
2842
{
2843
char *interface = NULL;
2844
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2845
interface))){
2846
if(strcmp(interface, "none") != 0
2847
and if_nametoindex(interface) == 0){
2848
if(interface[0] != '\0'){
2849
fprintf_plus(stderr, "Not using nonexisting interface"
2850
" \"%s\"\n", interface);
2851
}
2852
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2853
interface = NULL;
2854
}
2855
}
2856
}
2857
2858
/* Run network hooks */
2859
{
2860
if(mc.interfaces != NULL){
2861
interfaces_hooks = malloc(mc.interfaces_size);
2862
if(interfaces_hooks == NULL){
2863
perror_plus("malloc");
2864
goto end;
2865
}
2866
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2867
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2868
}
2869
run_network_hooks("start", interfaces_hooks != NULL ?
2870
interfaces_hooks : "", delay);
1020
2871
}
1021
2872
1022
2873
if(not debug){
1027
2878
from the signal handler */
1028
2879
/* Initialize the pseudo-RNG for Avahi */
1029
2880
srand((unsigned int) time(NULL));
1030
mc.simple_poll = avahi_simple_poll_new();
1031
if(mc.simple_poll == NULL){
1032
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1033
exitcode = EXIT_FAILURE;
2881
simple_poll = avahi_simple_poll_new();
2882
if(simple_poll == NULL){
2883
fprintf_plus(stderr,
2884
"Avahi: Failed to create simple poll object.\n");
2885
exitcode = EX_UNAVAILABLE;
1034
2886
goto end;
1035
2887
}
1036
2888
1037
2889
sigemptyset(&sigterm_action.sa_mask);
1038
2890
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1039
2891
if(ret == -1){
1040
perror("sigaddset");
1041
exitcode = EXIT_FAILURE;
2892
perror_plus("sigaddset");
2893
exitcode = EX_OSERR;
1042
2894
goto end;
1043
2895
}
1044
2896
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1045
2897
if(ret == -1){
1046
perror("sigaddset");
1047
exitcode = EXIT_FAILURE;
2898
perror_plus("sigaddset");
2899
exitcode = EX_OSERR;
1048
2900
goto end;
1049
2901
}
1050
2902
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1051
2903
if(ret == -1){
1052
perror("sigaddset");
1053
exitcode = EXIT_FAILURE;
1054
goto end;
1055
}
1056
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1057
if(ret == -1){
1058
perror("sigaction");
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* If the interface is down, bring it up */
1064
if(interface[0] != '\0'){
1065
if_index = (AvahiIfIndex) if_nametoindex(interface);
1066
if(if_index == 0){
1067
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
if(quit_now){
1073
goto end;
1074
}
1075
1076
#ifdef __linux__
1077
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1078
messages to mess up the prompt */
1079
ret = klogctl(8, NULL, 5);
1080
bool restore_loglevel = true;
1081
if(ret == -1){
1082
restore_loglevel = false;
1083
perror("klogctl");
1084
}
1085
#endif /* __linux__ */
1086
1087
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1088
if(sd < 0){
1089
perror("socket");
1090
exitcode = EXIT_FAILURE;
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
goto end;
1100
}
1101
strcpy(network.ifr_name, interface);
1102
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1103
if(ret == -1){
1104
perror("ioctl SIOCGIFFLAGS");
1105
#ifdef __linux__
1106
if(restore_loglevel){
1107
ret = klogctl(7, NULL, 0);
1108
if(ret == -1){
1109
perror("klogctl");
1110
}
1111
}
1112
#endif /* __linux__ */
1113
exitcode = EXIT_FAILURE;
1114
goto end;
1115
}
1116
if((network.ifr_flags & IFF_UP) == 0){
1117
network.ifr_flags |= IFF_UP;
1118
take_down_interface = true;
1119
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1120
if(ret == -1){
1121
take_down_interface = false;
1122
perror("ioctl SIOCSIFFLAGS");
1123
exitcode = EXIT_FAILURE;
1124
#ifdef __linux__
1125
if(restore_loglevel){
1126
ret = klogctl(7, NULL, 0);
1127
if(ret == -1){
1128
perror("klogctl");
2904
perror_plus("sigaddset");
2905
exitcode = EX_OSERR;
2906
goto end;
2907
}
2908
/* Need to check if the handler is SIG_IGN before handling:
2909
| [[info:libc:Initial Signal Actions]] |
2910
| [[info:libc:Basic Signal Handling]] |
2911
*/
2912
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2913
if(ret == -1){
2914
perror_plus("sigaction");
2915
return EX_OSERR;
2916
}
2917
if(old_sigterm_action.sa_handler != SIG_IGN){
2918
ret = sigaction(SIGINT, &sigterm_action, NULL);
2919
if(ret == -1){
2920
perror_plus("sigaction");
2921
exitcode = EX_OSERR;
2922
goto end;
2923
}
2924
}
2925
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2926
if(ret == -1){
2927
perror_plus("sigaction");
2928
return EX_OSERR;
2929
}
2930
if(old_sigterm_action.sa_handler != SIG_IGN){
2931
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2932
if(ret == -1){
2933
perror_plus("sigaction");
2934
exitcode = EX_OSERR;
2935
goto end;
2936
}
2937
}
2938
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2939
if(ret == -1){
2940
perror_plus("sigaction");
2941
return EX_OSERR;
2942
}
2943
if(old_sigterm_action.sa_handler != SIG_IGN){
2944
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2945
if(ret == -1){
2946
perror_plus("sigaction");
2947
exitcode = EX_OSERR;
2948
goto end;
2949
}
2950
}
2951
2952
/* If no interfaces were specified, make a list */
2953
if(mc.interfaces == NULL){
2954
struct dirent **direntries = NULL;
2955
/* Look for any good interfaces */
2956
ret = scandir(sys_class_net, &direntries, good_interface,
2957
alphasort);
2958
if(ret >= 1){
2959
/* Add all found interfaces to interfaces list */
2960
for(int i = 0; i < ret; ++i){
2961
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2962
direntries[i]->d_name);
2963
if(ret_errno != 0){
2964
errno = ret_errno;
2965
perror_plus("argz_add");
2966
free(direntries[i]);
2967
continue;
2968
}
2969
if(debug){
2970
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2971
direntries[i]->d_name);
2972
}
2973
free(direntries[i]);
2974
}
2975
free(direntries);
2976
} else {
2977
if(ret == 0){
2978
free(direntries);
2979
}
2980
fprintf_plus(stderr, "Could not find a network interface\n");
2981
exitcode = EXIT_FAILURE;
2982
goto end;
2983
}
2984
}
2985
2986
/* Bring up interfaces which are down, and remove any "none"s */
2987
{
2988
char *interface = NULL;
2989
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2990
interface))){
2991
/* If interface name is "none", stop bringing up interfaces.
2992
Also remove all instances of "none" from the list */
2993
if(strcmp(interface, "none") == 0){
2994
argz_delete(&mc.interfaces, &mc.interfaces_size,
2995
interface);
2996
interface = NULL;
2997
while((interface = argz_next(mc.interfaces,
2998
mc.interfaces_size, interface))){
2999
if(strcmp(interface, "none") == 0){
3000
argz_delete(&mc.interfaces, &mc.interfaces_size,
3001
interface);
3002
interface = NULL;
1129
3003
}
1130
3004
}
1131
#endif /* __linux__ */
1132
goto end;
1133
}
1134
}
1135
/* sleep checking until interface is running */
1136
for(int i=0; i < delay * 4; i++){
1137
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1138
if(ret == -1){
1139
perror("ioctl SIOCGIFFLAGS");
1140
} else if(network.ifr_flags & IFF_RUNNING){
1141
3005
break;
1142
3006
}
1143
struct timespec sleeptime = { .tv_nsec = 250000000 };
1144
ret = nanosleep(&sleeptime, NULL);
1145
if(ret == -1 and errno != EINTR){
1146
perror("nanosleep");
1147
}
1148
}
1149
if(not take_down_interface){
1150
/* We won't need the socket anymore */
1151
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1152
if(ret == -1){
1153
perror("close");
1154
}
1155
}
1156
#ifdef __linux__
1157
if(restore_loglevel){
1158
/* Restores kernel loglevel to default */
1159
ret = klogctl(7, NULL, 0);
1160
if(ret == -1){
1161
perror("klogctl");
1162
}
1163
}
1164
#endif /* __linux__ */
1165
}
1166
1167
if(quit_now){
1168
goto end;
1169
}
1170
1171
uid = getuid();
1172
gid = getgid();
1173
1174
errno = 0;
1175
setgid(gid);
1176
if(ret == -1){
1177
perror("setgid");
1178
}
1179
1180
ret = setuid(uid);
1181
if(ret == -1){
1182
perror("setuid");
1183
}
1184
1185
if(quit_now){
1186
goto end;
1187
}
1188
1189
ret = init_gnutls_global(pubkey, seckey);
1190
if(ret == -1){
1191
fprintf(stderr, "init_gnutls_global failed\n");
1192
exitcode = EXIT_FAILURE;
3007
bool interface_was_up = interface_is_up(interface);
3008
errno = bring_up_interface(interface, delay);
3009
if(not interface_was_up){
3010
if(errno != 0){
3011
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
3012
" %s\n", interface, strerror(errno));
3013
} else {
3014
errno = argz_add(&interfaces_to_take_down,
3015
&interfaces_to_take_down_size,
3016
interface);
3017
if(errno != 0){
3018
perror_plus("argz_add");
3019
}
3020
}
3021
}
3022
}
3023
if(debug and (interfaces_to_take_down == NULL)){
3024
fprintf_plus(stderr, "No interfaces were brought up\n");
3025
}
3026
}
3027
3028
/* If we only got one interface, explicitly use only that one */
3029
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
3030
if(debug){
3031
fprintf_plus(stderr, "Using only interface \"%s\"\n",
3032
mc.interfaces);
3033
}
3034
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
3035
}
3036
3037
if(quit_now){
3038
goto end;
3039
}
3040
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
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
if(ret == -1){
3049
fprintf_plus(stderr, "init_gnutls_global failed\n");
3050
exitcode = EX_UNAVAILABLE;
1193
3051
goto end;
1194
3052
} else {
1195
3053
gnutls_initialized = true;
1199
3057
goto end;
1200
3058
}
1201
3059
1202
tempdir_created = true;
1203
if(mkdtemp(tempdir) == NULL){
1204
tempdir_created = false;
1205
perror("mkdtemp");
3060
/* Try /run/tmp before /tmp */
3061
tempdir = mkdtemp(run_tempdir);
3062
if(tempdir == NULL and errno == ENOENT){
3063
if(debug){
3064
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3065
run_tempdir, old_tempdir);
3066
}
3067
tempdir = mkdtemp(old_tempdir);
3068
}
3069
if(tempdir == NULL){
3070
perror_plus("mkdtemp");
1206
3071
goto end;
1207
3072
}
1208
3073
1210
3075
goto end;
1211
3076
}
1212
3077
1213
if(not init_gpgme(pubkey, seckey, tempdir)){
1214
fprintf(stderr, "init_gpgme failed\n");
1215
exitcode = EXIT_FAILURE;
3078
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3079
fprintf_plus(stderr, "init_gpgme failed\n");
3080
exitcode = EX_UNAVAILABLE;
1216
3081
goto end;
1217
3082
} else {
1218
3083
gpgme_initialized = true;
1226
3091
/* Connect directly, do not use Zeroconf */
1227
3092
/* (Mainly meant for debugging) */
1228
3093
char *address = strrchr(connect_to, ':');
3094
1229
3095
if(address == NULL){
1230
fprintf(stderr, "No colon in address\n");
1231
exitcode = EXIT_FAILURE;
3096
fprintf_plus(stderr, "No colon in address\n");
3097
exitcode = EX_USAGE;
1232
3098
goto end;
1233
3099
}
1234
3100
1236
3102
goto end;
1237
3103
}
1238
3104
1239
uint16_t port;
3105
in_port_t port;
1240
3106
errno = 0;
1241
3107
tmpmax = strtoimax(address+1, &tmp, 10);
1242
3108
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1243
or tmpmax != (uint16_t)tmpmax){
1244
fprintf(stderr, "Bad port number\n");
1245
exitcode = EXIT_FAILURE;
3109
or tmpmax != (in_port_t)tmpmax){
3110
fprintf_plus(stderr, "Bad port number\n");
3111
exitcode = EX_USAGE;
1246
3112
goto end;
1247
3113
}
1248
3114
1249
3115
if(quit_now){
1250
3116
goto end;
1251
3117
}
1252
3118
1253
port = (uint16_t)tmpmax;
3119
port = (in_port_t)tmpmax;
1254
3120
*address = '\0';
1255
address = connect_to;
1256
3121
/* Colon in address indicates IPv6 */
1257
3122
int af;
1258
if(strchr(address, ':') != NULL){
3123
if(strchr(connect_to, ':') != NULL){
1259
3124
af = AF_INET6;
3125
/* Accept [] around IPv6 address - see RFC 5952 */
3126
if(connect_to[0] == '[' and address[-1] == ']')
3127
{
3128
connect_to++;
3129
address[-1] = '\0';
3130
}
1260
3131
} else {
1261
3132
af = AF_INET;
1262
3133
}
3134
address = connect_to;
1263
3135
1264
3136
if(quit_now){
1265
3137
goto end;
1266
3138
}
1267
3139
1268
ret = start_mandos_communication(address, port, if_index, af);
1269
if(ret < 0){
1270
exitcode = EXIT_FAILURE;
1271
} else {
3140
while(not quit_now){
3141
ret = start_mandos_communication(address, port, if_index, af,
3142
&mc);
3143
if(quit_now or ret == 0){
3144
break;
3145
}
3146
if(debug){
3147
fprintf_plus(stderr, "Retrying in %d seconds\n",
3148
(int)retry_interval);
3149
}
3150
sleep((unsigned int)retry_interval);
3151
}
3152
3153
if(not quit_now){
1272
3154
exitcode = EXIT_SUCCESS;
1273
3155
}
3156
1274
3157
goto end;
1275
3158
}
1276
3159
1288
3171
config.publish_domain = 0;
1289
3172
1290
3173
/* Allocate a new server */
1291
mc.server = avahi_server_new(avahi_simple_poll_get
1292
(mc.simple_poll), &config, NULL,
1293
NULL, &error);
3174
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3175
&config, NULL, NULL, &ret);
1294
3176
1295
3177
/* Free the Avahi configuration data */
1296
3178
avahi_server_config_free(&config);
1298
3180
1299
3181
/* Check if creating the Avahi server object succeeded */
1300
3182
if(mc.server == NULL){
1301
fprintf(stderr, "Failed to create Avahi server: %s\n",
1302
avahi_strerror(error));
1303
exitcode = EXIT_FAILURE;
3183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3184
avahi_strerror(ret));
3185
exitcode = EX_UNAVAILABLE;
1304
3186
goto end;
1305
3187
}
1306
3188
1311
3193
/* Create the Avahi service browser */
1312
3194
sb = avahi_s_service_browser_new(mc.server, if_index,
1313
3195
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1314
NULL, 0, browse_callback, NULL);
3196
NULL, 0, browse_callback,
3197
(void *)&mc);
1315
3198
if(sb == NULL){
1316
fprintf(stderr, "Failed to create service browser: %s\n",
1317
avahi_strerror(avahi_server_errno(mc.server)));
1318
exitcode = EXIT_FAILURE;
3199
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3200
avahi_strerror(avahi_server_errno(mc.server)));
3201
exitcode = EX_UNAVAILABLE;
1319
3202
goto end;
1320
3203
}
1321
3204
1326
3209
/* Run the main loop */
1327
3210
1328
3211
if(debug){
1329
fprintf(stderr, "Starting Avahi loop search\n");
3212
fprintf_plus(stderr, "Starting Avahi loop search\n");
1330
3213
}
1331
3214
1332
avahi_simple_poll_loop(mc.simple_poll);
3215
ret = avahi_loop_with_timeout(simple_poll,
3216
(int)(retry_interval * 1000), &mc);
3217
if(debug){
3218
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3219
(ret == 0) ? "successfully" : "with error");
3220
}
1333
3221
1334
3222
end:
1335
3223
1336
3224
if(debug){
1337
fprintf(stderr, "%s exiting\n", argv[0]);
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
}
1338
3232
}
1339
3233
1340
3234
/* Cleanup things */
3235
free(mc.interfaces);
3236
1341
3237
if(sb != NULL)
1342
3238
avahi_s_service_browser_free(sb);
1343
3239
1344
3240
if(mc.server != NULL)
1345
3241
avahi_server_free(mc.server);
1346
3242
1347
if(mc.simple_poll != NULL)
1348
avahi_simple_poll_free(mc.simple_poll);
3243
if(simple_poll != NULL)
3244
avahi_simple_poll_free(simple_poll);
1349
3245
1350
3246
if(gnutls_initialized){
1351
3247
gnutls_certificate_free_credentials(mc.cred);
1352
gnutls_global_deinit();
1353
3248
gnutls_dh_params_deinit(mc.dh_params);
1354
3249
}
1355
3250
1357
3252
gpgme_release(mc.ctx);
1358
3253
}
1359
3254
1360
/* Take down the network interface */
1361
if(take_down_interface){
1362
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1363
if(ret == -1){
1364
perror("ioctl SIOCGIFFLAGS");
1365
} else if(network.ifr_flags & IFF_UP) {
1366
network.ifr_flags &= ~IFF_UP; /* clear flag */
1367
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1368
if(ret == -1){
1369
perror("ioctl SIOCSIFFLAGS");
1370
}
1371
}
1372
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1373
if(ret == -1){
1374
perror("close");
1375
}
1376
}
1377
1378
/* Removes the temp directory used by GPGME */
1379
if(tempdir_created){
1380
DIR *d;
1381
struct dirent *direntry;
1382
d = opendir(tempdir);
1383
if(d == NULL){
1384
if(errno != ENOENT){
1385
perror("opendir");
1386
}
1387
} else {
1388
while(true){
1389
direntry = readdir(d);
1390
if(direntry == NULL){
1391
break;
1392
}
1393
/* Skip "." and ".." */
1394
if(direntry->d_name[0] == '.'
1395
and (direntry->d_name[1] == '\0'
1396
or (direntry->d_name[1] == '.'
1397
and direntry->d_name[2] == '\0'))){
1398
continue;
1399
}
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", tempdir,
1402
direntry->d_name);
1403
if(ret < 0){
1404
perror("asprintf");
1405
continue;
1406
}
1407
ret = remove(fullname);
1408
if(ret == -1){
1409
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1410
strerror(errno));
1411
}
1412
free(fullname);
1413
}
1414
closedir(d);
1415
}
1416
ret = rmdir(tempdir);
1417
if(ret == -1 and errno != ENOENT){
1418
perror("rmdir");
1419
}
3255
/* Cleans up the circular linked list of Mandos servers the client
3256
has seen */
3257
if(mc.current_server != NULL){
3258
mc.current_server->prev->next = NULL;
3259
while(mc.current_server != NULL){
3260
server *next = mc.current_server->next;
3261
#ifdef __GNUC__
3262
#pragma GCC diagnostic push
3263
#pragma GCC diagnostic ignored "-Wcast-qual"
3264
#endif
3265
free((char *)(mc.current_server->ip));
3266
#ifdef __GNUC__
3267
#pragma GCC diagnostic pop
3268
#endif
3269
free(mc.current_server);
3270
mc.current_server = next;
3271
}
3272
}
3273
3274
/* Re-raise privileges */
3275
{
3276
ret = raise_privileges();
3277
if(ret != 0){
3278
errno = ret;
3279
perror_plus("Failed to raise privileges");
3280
} else {
3281
3282
/* Run network hooks */
3283
run_network_hooks("stop", interfaces_hooks != NULL ?
3284
interfaces_hooks : "", delay);
3285
3286
/* Take down the network interfaces which were brought up */
3287
{
3288
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;
3295
perror_plus("Failed to take down interface");
3296
}
3297
}
3298
if(debug and (interfaces_to_take_down == NULL)){
3299
fprintf_plus(stderr, "No interfaces needed to be taken"
3300
" down\n");
3301
}
3302
}
3303
}
3304
3305
ret = lower_privileges_permanently();
3306
if(ret != 0){
3307
errno = ret;
3308
perror_plus("Failed to lower privileges permanently");
3309
}
3310
}
3311
3312
free(interfaces_to_take_down);
3313
free(interfaces_hooks);
3314
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
/* Removes the GPGME temp directory and all files inside */
3370
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);
3372
}
3373
3374
if(quit_now){
3375
sigemptyset(&old_sigterm_action.sa_mask);
3376
old_sigterm_action.sa_handler = SIG_DFL;
3377
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3378
&old_sigterm_action,
3379
NULL));
3380
if(ret == -1){
3381
perror_plus("sigaction");
3382
}
3383
do {
3384
ret = raise(signal_received);
3385
} while(ret != 0 and errno == EINTR);
3386
if(ret != 0){
3387
perror_plus("raise");
3388
abort();
3389
}
3390
TEMP_FAILURE_RETRY(pause());
1420
3391
}
1421
3392
1422
3393
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0