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237.7.846
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2024-09-09 04:24:39 UTC
- mto: This revision was merged to the branch mainline in revision 410.
- Revision ID: teddy@recompile.se-20240909042439-j85mr20uli2hnyis
Eliminate compiler warnings
Many programs use nested functions, which now result in a linker
warning about executable stack. Hide this warning. Also, rewrite a
loop in the plymouth plugin to avoid warning about signed overflow.
This change also makes the plugin pick the alphabetically first
process entry instead of the last, in case many plymouth processes are
found (which should be unlikely).
* Makefile (plugin-runner, dracut-module/password-agent,
plugins.d/password-prompt, plugins.d/mandos-client,
plugins.d/plymouth): New target; set LDFLAGS to add "-Xlinker
--no-warn-execstack".
* plugins.d/plymouth.c (get_pid): When no pid files are found, and we
are looking through the process list, go though it from the start
instead of from the end, i.e. in normal alphabetical order and not
in reverse order.
Many programs use nested functions, which now result in a linker
warning about executable stack. Hide this warning. Also, rewrite a
loop in the plymouth plugin to avoid warning about signed overflow.
This change also makes the plugin pick the alphabetically first
process entry instead of the last, in case many plymouth processes are
found (which should be unlikely).
* Makefile (plugin-runner, dracut-module/password-agent,
plugins.d/password-prompt, plugins.d/mandos-client,
plugins.d/plymouth): New target; set LDFLAGS to add "-Xlinker
--no-warn-execstack".
* plugins.d/plymouth.c (get_pid): When no pid files are found, and we
are looking through the process list, go though it from the start
instead of from the end, i.e. in normal alphabetical order and not
in reverse order.
- 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
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/* 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
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111
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/* 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
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/* Used for passing in values through the Avahi callback functions */
130
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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
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/* 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
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
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");
322
652
}
323
653
}
324
654
}
326
656
}
327
657
328
658
if(debug){
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
659
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
660
}
331
661
332
662
/* Seek back to the beginning of the GPGME plaintext data buffer */
333
663
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
664
perror_plus("gpgme_data_seek");
335
665
plaintext_length = -1;
336
666
goto decrypt_end;
337
667
}
339
669
*plaintext = NULL;
340
670
while(true){
341
671
plaintext_capacity = incbuffer(plaintext,
342
(size_t)plaintext_length,
343
plaintext_capacity);
672
(size_t)plaintext_length,
673
plaintext_capacity);
344
674
if(plaintext_capacity == 0){
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
675
perror_plus("incbuffer");
676
plaintext_length = -1;
677
goto decrypt_end;
348
678
}
349
679
350
680
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
355
685
break;
356
686
}
357
687
if(ret < 0){
358
perror("gpgme_data_read");
688
perror_plus("gpgme_data_read");
359
689
plaintext_length = -1;
360
690
goto decrypt_end;
361
691
}
363
693
}
364
694
365
695
if(debug){
366
fprintf(stderr, "Decrypted password is: ");
696
fprintf_plus(stderr, "Decrypted password is: ");
367
697
for(ssize_t i = 0; i < plaintext_length; i++){
368
698
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
369
699
}
380
710
return plaintext_length;
381
711
}
382
712
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
386
if(ret == NULL)
387
ret = "(unknown)";
388
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);
389
724
}
390
725
391
726
/* GnuTLS log function callback */
727
__attribute__((nonnull))
392
728
static void debuggnutls(__attribute__((unused)) int level,
393
729
const char* string){
394
fprintf(stderr, "GnuTLS: %s", string);
730
fprintf_plus(stderr, "GnuTLS: %s", string);
395
731
}
396
732
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
397
734
static int init_gnutls_global(const char *pubkeyfilename,
398
const char *seckeyfilename){
735
const char *seckeyfilename,
736
const char *dhparamsfilename,
737
mandos_context *mc){
399
738
int ret;
400
739
401
740
if(debug){
402
fprintf(stderr, "Initializing GnuTLS\n");
403
}
404
405
ret = gnutls_global_init();
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
409
return -1;
741
fprintf_plus(stderr, "Initializing GnuTLS\n");
410
742
}
411
743
412
744
if(debug){
418
750
}
419
751
420
752
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
753
ret = gnutls_certificate_allocate_credentials(&mc->cred);
422
754
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
428
gnutls_global_deinit();
755
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
756
safer_gnutls_strerror(ret));
429
757
return -1;
430
758
}
431
759
432
760
if(debug){
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
763
pubkeyfilename,
764
seckeyfilename);
436
765
}
437
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
438
780
ret = gnutls_certificate_set_openpgp_key_file
439
(mc.cred, pubkeyfilename, seckeyfilename,
781
(mc->cred, pubkeyfilename, seckeyfilename,
440
782
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
441
786
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
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));
447
792
goto globalfail;
448
793
}
449
794
450
795
/* GnuTLS server initialization */
451
ret = gnutls_dh_params_init(&mc.dh_params);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
461
goto globalfail;
462
}
463
464
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
}
465
985
466
986
return 0;
467
987
468
988
globalfail:
469
989
470
gnutls_certificate_free_credentials(mc.cred);
471
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
990
gnutls_certificate_free_credentials(mc->cred);
991
gnutls_dh_params_deinit(mc->dh_params);
473
992
return -1;
474
993
}
475
994
476
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){
477
998
int ret;
478
999
/* GnuTLS session creation */
479
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);
480
1013
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
1014
fprintf_plus(stderr,
1015
"Error in GnuTLS session initialization: %s\n",
1016
safer_gnutls_strerror(ret));
483
1017
}
484
1018
485
1019
{
486
1020
const char *err;
487
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);
488
1028
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
1029
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1030
fprintf_plus(stderr, "GnuTLS error: %s\n",
1031
safer_gnutls_strerror(ret));
492
1032
gnutls_deinit(*session);
493
1033
return -1;
494
1034
}
495
1035
}
496
1036
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
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);
499
1045
if(ret != GNUTLS_E_SUCCESS){
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
1046
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1047
safer_gnutls_strerror(ret));
502
1048
gnutls_deinit(*session);
503
1049
return -1;
504
1050
}
505
1051
506
1052
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
509
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
1053
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
511
1054
512
1055
return 0;
513
1056
}
516
1059
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
517
1060
__attribute__((unused)) const char *txt){}
518
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
519
1235
/* Called when a Mandos server is found */
520
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,
521
1238
AvahiIfIndex if_index,
522
int af){
523
int ret, tcp_sd;
1239
int af, mandos_context *mc){
1240
int ret, tcp_sd = -1;
524
1241
ssize_t sret;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
1242
struct sockaddr_storage to;
529
1243
char *buffer = NULL;
530
char *decrypted_buffer;
1244
char *decrypted_buffer = NULL;
531
1245
size_t buffer_length = 0;
532
1246
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
534
1247
size_t written;
535
int retval = 0;
1248
int retval = -1;
536
1249
gnutls_session_t session;
537
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
}
538
1259
539
1260
switch(af){
540
1261
case AF_INET6:
544
1265
pf = PF_INET;
545
1266
break;
546
1267
default:
547
fprintf(stderr, "Bad address family: %d\n", af);
1268
fprintf_plus(stderr, "Bad address family: %d\n", af);
1269
errno = EINVAL;
548
1270
return -1;
549
1271
}
550
1272
551
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);
552
1307
if(ret != 0){
553
1308
return -1;
554
1309
}
555
1310
556
1311
if(debug){
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
1312
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1313
PRIuMAX "\n", ip, (uintmax_t)port);
559
1314
}
560
1315
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
1316
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
562
1317
if(tcp_sd < 0){
563
perror("socket");
564
return -1;
565
}
566
567
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
568
1329
if(af == AF_INET6){
569
to.in6.sin6_family = (sa_family_t)af;
570
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);
571
1333
} else { /* IPv4 */
572
to.in.sin_family = (sa_family_t)af;
573
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);
574
1337
}
575
1338
if(ret < 0 ){
576
perror("inet_pton");
577
return -1;
1339
int e = errno;
1340
perror_plus("inet_pton");
1341
errno = e;
1342
goto mandos_end;
578
1343
}
579
1344
if(ret == 0){
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
1345
int e = errno;
1346
fprintf_plus(stderr, "Bad address: %s\n", ip);
1347
errno = e;
1348
goto mandos_end;
582
1349
}
583
1350
if(af == AF_INET6){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
1351
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1352
if(IN6_IS_ADDR_LINKLOCAL
1353
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
591
1354
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
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;
595
1359
}
596
1360
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
1361
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
598
1362
}
599
1363
} else {
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
1364
((struct sockaddr_in *)&to)->sin_port = htons(port);
1365
}
1366
1367
if(quit_now){
1368
errno = EINTR;
1369
goto mandos_end;
603
1370
}
604
1371
605
1372
if(debug){
606
1373
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
1374
char interface[IF_NAMESIZE];
608
1375
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
1376
perror_plus("if_indextoname");
610
1377
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
1378
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1379
"\n", ip, interface, (uintmax_t)port);
613
1380
}
614
1381
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
1382
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1383
ip, (uintmax_t)port);
617
1384
}
618
1385
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
1386
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
620
const char *pcret;
621
if(af == AF_INET6){
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
sizeof(addrstr));
624
} else {
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
626
sizeof(addrstr));
627
}
628
if(pcret == NULL){
629
perror("inet_ntop");
630
} else {
631
if(strcmp(addrstr, ip) != 0){
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
633
}
634
}
635
}
636
637
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
}
642
if(ret < 0){
643
perror("connect");
644
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;
645
1467
}
646
1468
647
1469
const char *out = mandos_protocol_version;
649
1471
while(true){
650
1472
size_t out_size = strlen(out);
651
1473
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
out_size - written));
1474
out_size - written));
653
1475
if(ret == -1){
654
perror("write");
655
retval = -1;
1476
int e = errno;
1477
perror_plus("write");
1478
errno = e;
656
1479
goto mandos_end;
657
1480
}
658
1481
written += (size_t)ret;
666
1489
break;
667
1490
}
668
1491
}
1492
1493
if(quit_now){
1494
errno = EINTR;
1495
goto mandos_end;
1496
}
669
1497
}
670
1498
671
1499
if(debug){
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
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 {
678
1520
ret = gnutls_handshake(session);
1521
if(quit_now){
1522
errno = EINTR;
1523
goto mandos_end;
1524
}
679
1525
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
1526
681
1527
if(ret != GNUTLS_E_SUCCESS){
682
1528
if(debug){
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1529
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
684
1530
gnutls_perror(ret);
685
1531
}
686
retval = -1;
1532
errno = EPROTO;
687
1533
goto mandos_end;
688
1534
}
689
1535
690
1536
/* Read OpenPGP packet that contains the wanted password */
691
1537
692
1538
if(debug){
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
1539
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1540
" %s\n", ip);
695
1541
}
696
1542
697
1543
while(true){
1544
1545
if(quit_now){
1546
errno = EINTR;
1547
goto mandos_end;
1548
}
1549
698
1550
buffer_capacity = incbuffer(&buffer, buffer_length,
699
buffer_capacity);
1551
buffer_capacity);
700
1552
if(buffer_capacity == 0){
701
perror("incbuffer");
702
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;
703
1561
goto mandos_end;
704
1562
}
705
1563
714
1572
case GNUTLS_E_AGAIN:
715
1573
break;
716
1574
case GNUTLS_E_REHANDSHAKE:
717
do{
1575
do {
718
1576
ret = gnutls_handshake(session);
1577
1578
if(quit_now){
1579
errno = EINTR;
1580
goto mandos_end;
1581
}
719
1582
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
1583
if(ret < 0){
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1584
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1585
"***\n");
722
1586
gnutls_perror(ret);
723
retval = -1;
1587
errno = EPROTO;
724
1588
goto mandos_end;
725
1589
}
726
1590
break;
727
1591
default:
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
1592
fprintf_plus(stderr, "Unknown error while reading data from"
1593
" encrypted session with Mandos server\n");
731
1594
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1595
errno = EIO;
732
1596
goto mandos_end;
733
1597
}
734
1598
} else {
737
1601
}
738
1602
739
1603
if(debug){
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
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);
744
1619
745
1620
if(buffer_length > 0){
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
748
&decrypted_buffer);
1621
ssize_t decrypted_buffer_size;
1622
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1623
&decrypted_buffer, mc);
749
1624
if(decrypted_buffer_size >= 0){
1625
1626
clearerr(stdout);
750
1627
written = 0;
751
1628
while(written < (size_t) decrypted_buffer_size){
1629
if(quit_now){
1630
errno = EINTR;
1631
goto mandos_end;
1632
}
1633
752
1634
ret = (int)fwrite(decrypted_buffer + written, 1,
753
1635
(size_t)decrypted_buffer_size - written,
754
1636
stdout);
755
1637
if(ret == 0 and ferror(stdout)){
1638
int e = errno;
756
1639
if(debug){
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
1640
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1641
strerror(errno));
759
1642
}
760
retval = -1;
761
break;
1643
errno = e;
1644
goto mandos_end;
762
1645
}
763
1646
written += (size_t)ret;
764
1647
}
765
free(decrypted_buffer);
766
} else {
767
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;
768
1659
}
769
} else {
770
retval = -1;
771
1660
}
772
1661
773
1662
/* Shutdown procedure */
774
1663
775
1664
mandos_end:
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
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
}
780
1690
}
781
gnutls_deinit(session);
782
1691
return retval;
783
1692
}
784
1693
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
1715
if(quit_now){
1716
avahi_s_service_resolver_free(r);
1717
return;
1718
}
1719
804
1720
switch(event){
805
1721
default:
806
1722
case AVAHI_RESOLVER_FAILURE:
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
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)));
810
1728
break;
811
1729
812
1730
case AVAHI_RESOLVER_FOUND:
814
1732
char ip[AVAHI_ADDRESS_STR_MAX];
815
1733
avahi_address_snprint(ip, sizeof(ip), address);
816
1734
if(debug){
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
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);
820
1738
}
821
int ret = start_mandos_communication(ip, port, interface,
822
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);
823
1743
if(ret == 0){
824
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
}
825
1752
}
826
1753
}
827
1754
}
837
1764
const char *domain,
838
1765
AVAHI_GCC_UNUSED AvahiLookupResultFlags
839
1766
flags,
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
1767
void *mc){
1768
if(b == NULL){
1769
return;
1770
}
842
1771
843
1772
/* Called whenever a new services becomes available on the LAN or
844
1773
is removed from the LAN */
845
1774
1775
if(quit_now){
1776
return;
1777
}
1778
846
1779
switch(event){
847
1780
default:
848
1781
case AVAHI_BROWSER_FAILURE:
849
1782
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
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);
853
1787
return;
854
1788
855
1789
case AVAHI_BROWSER_NEW:
858
1792
the callback function is called the Avahi server will free the
859
1793
resolver for us. */
860
1794
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
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)));
866
1803
break;
867
1804
868
1805
case AVAHI_BROWSER_REMOVE:
871
1808
case AVAHI_BROWSER_ALL_FOR_NOW:
872
1809
case AVAHI_BROWSER_CACHE_EXHAUSTED:
873
1810
if(debug){
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1811
fprintf_plus(stderr, "No Mandos server found, still"
1812
" searching...\n");
875
1813
}
876
1814
break;
877
1815
}
878
1816
}
879
1817
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1818
/* Signal handler that stops main loop after SIGTERM */
1819
static void handle_sigterm(int sig){
884
1820
if(quit_now){
885
1821
return;
886
1822
}
887
1823
quit_now = 1;
888
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
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;
893
2496
}
894
2497
895
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 };
896
2512
AvahiSServiceBrowser *sb = NULL;
897
int error;
2513
error_t ret_errno;
898
2514
int ret;
899
2515
intmax_t tmpmax;
900
2516
char *tmp;
901
2517
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
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;
910
2523
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
2524
const char *seckey = PATHDIR "/" SECKEY;
912
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;
913
2532
914
2533
bool gnutls_initialized = false;
915
2534
bool gpgme_initialized = false;
916
2535
float delay = 2.5f;
2536
double retry_interval = 10; /* 10s between trying a server and
2537
retrying the same server again */
917
2538
918
struct sigaction old_sigterm_action;
2539
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
2540
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
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
921
2563
{
922
2564
struct argp_option options[] = {
923
2565
{ .name = "debug", .key = 128,
938
2580
{ .name = "pubkey", .key = 'p',
939
2581
.arg = "FILE",
940
2582
.doc = "OpenPGP public key file base name",
941
.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 },
942
2600
{ .name = "dh-bits", .key = 129,
943
2601
.arg = "BITS",
944
2602
.doc = "Bit length of the prime number used in the"
945
2603
" Diffie-Hellman key exchange",
946
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 },
947
2610
{ .name = "priority", .key = 130,
948
2611
.arg = "STRING",
949
2612
.doc = "GnuTLS priority string for the TLS handshake",
952
2615
.arg = "SECONDS",
953
2616
.doc = "Maximum delay to wait for interface startup",
954
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 },
955
2635
{ .name = NULL }
956
2636
};
957
2637
958
2638
error_t parse_opt(int key, char *arg,
959
2639
struct argp_state *state){
2640
errno = 0;
960
2641
switch(key){
961
2642
case 128: /* --debug */
962
2643
debug = true;
965
2646
connect_to = arg;
966
2647
break;
967
2648
case 'i': /* --interface */
968
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
}
969
2654
break;
970
2655
case 's': /* --seckey */
971
2656
seckey = arg;
973
2658
case 'p': /* --pubkey */
974
2659
pubkey = arg;
975
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;
976
2671
case 129: /* --dh-bits */
977
2672
errno = 0;
978
2673
tmpmax = strtoimax(arg, &tmp, 10);
979
2674
if(errno != 0 or tmp == arg or *tmp != '\0'
980
2675
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
2676
argp_error(state, "Bad number of DH bits");
983
2677
}
984
2678
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
2679
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
986
2683
case 130: /* --priority */
987
2684
mc.priority = arg;
988
2685
break;
990
2687
errno = 0;
991
2688
delay = strtof(arg, &tmp);
992
2689
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
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);
1000
2719
break;
1001
2720
default:
1002
2721
return ARGP_ERR_UNKNOWN;
1003
2722
}
1004
return 0;
2723
return errno;
1005
2724
}
1006
2725
1007
2726
struct argp argp = { .options = options, .parser = parse_opt,
1008
2727
.args_doc = "",
1009
2728
.doc = "Mandos client -- Get and decrypt"
1010
2729
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
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);
1017
2871
}
1018
2872
1019
2873
if(not debug){
1024
2878
from the signal handler */
1025
2879
/* Initialize the pseudo-RNG for Avahi */
1026
2880
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
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;
1031
2886
goto end;
1032
2887
}
1033
2888
1034
2889
sigemptyset(&sigterm_action.sa_mask);
1035
2890
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
2891
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
2892
perror_plus("sigaddset");
2893
exitcode = EX_OSERR;
1039
2894
goto end;
1040
2895
}
1041
2896
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
2897
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
2898
perror_plus("sigaddset");
2899
exitcode = EX_OSERR;
1045
2900
goto end;
1046
2901
}
1047
2902
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
2903
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
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
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
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;
1113
3003
}
1114
3004
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
3005
break;
1126
3006
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
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;
1166
3051
goto end;
1167
3052
} else {
1168
3053
gnutls_initialized = true;
1169
3054
}
1170
3055
1171
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1173
goto end;
1174
}
1175
tempdir_created = true;
1176
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
3056
if(quit_now){
3057
goto end;
3058
}
3059
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");
3071
goto end;
3072
}
3073
3074
if(quit_now){
3075
goto end;
3076
}
3077
3078
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3079
fprintf_plus(stderr, "init_gpgme failed\n");
3080
exitcode = EX_UNAVAILABLE;
1180
3081
goto end;
1181
3082
} else {
1182
3083
gpgme_initialized = true;
1183
3084
}
1184
3085
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
3086
if(quit_now){
3087
goto end;
1192
3088
}
1193
3089
1194
3090
if(connect_to != NULL){
1195
3091
/* Connect directly, do not use Zeroconf */
1196
3092
/* (Mainly meant for debugging) */
1197
3093
char *address = strrchr(connect_to, ':');
3094
1198
3095
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
3096
fprintf_plus(stderr, "No colon in address\n");
3097
exitcode = EX_USAGE;
3098
goto end;
3099
}
3100
3101
if(quit_now){
3102
goto end;
3103
}
3104
3105
in_port_t port;
1204
3106
errno = 0;
1205
3107
tmpmax = strtoimax(address+1, &tmp, 10);
1206
3108
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
3109
or tmpmax != (in_port_t)tmpmax){
3110
fprintf_plus(stderr, "Bad port number\n");
3111
exitcode = EX_USAGE;
3112
goto end;
3113
}
3114
3115
if(quit_now){
3116
goto end;
3117
}
3118
3119
port = (in_port_t)tmpmax;
1213
3120
*address = '\0';
1214
address = connect_to;
1215
3121
/* Colon in address indicates IPv6 */
1216
3122
int af;
1217
if(strchr(address, ':') != NULL){
3123
if(strchr(connect_to, ':') != NULL){
1218
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
}
1219
3131
} else {
1220
3132
af = AF_INET;
1221
3133
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
3134
address = connect_to;
3135
3136
if(quit_now){
3137
goto end;
3138
}
3139
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){
1226
3154
exitcode = EXIT_SUCCESS;
1227
3155
}
1228
goto end;
1229
}
1230
3156
3157
goto end;
3158
}
3159
3160
if(quit_now){
3161
goto end;
3162
}
3163
1231
3164
{
1232
3165
AvahiServerConfig config;
1233
3166
/* Do not publish any local Zeroconf records */
1238
3171
config.publish_domain = 0;
1239
3172
1240
3173
/* Allocate a new server */
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
3174
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3175
&config, NULL, NULL, &ret);
1244
3176
1245
3177
/* Free the Avahi configuration data */
1246
3178
avahi_server_config_free(&config);
1248
3180
1249
3181
/* Check if creating the Avahi server object succeeded */
1250
3182
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
3183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3184
avahi_strerror(ret));
3185
exitcode = EX_UNAVAILABLE;
3186
goto end;
3187
}
3188
3189
if(quit_now){
1254
3190
goto end;
1255
3191
}
1256
3192
1257
3193
/* Create the Avahi service browser */
1258
3194
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
3195
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
3196
NULL, 0, browse_callback,
3197
(void *)&mc);
1261
3198
if(sb == NULL){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
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;
3202
goto end;
3203
}
3204
3205
if(quit_now){
1265
3206
goto end;
1266
3207
}
1267
3208
1268
3209
/* Run the main loop */
1269
3210
1270
3211
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
3212
fprintf_plus(stderr, "Starting Avahi loop search\n");
1272
3213
}
1273
3214
1274
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
}
1275
3221
1276
3222
end:
1277
3223
1278
3224
if(debug){
1279
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
}
1280
3232
}
1281
3233
1282
3234
/* Cleanup things */
3235
free(mc.interfaces);
3236
1283
3237
if(sb != NULL)
1284
3238
avahi_s_service_browser_free(sb);
1285
3239
1286
3240
if(mc.server != NULL)
1287
3241
avahi_server_free(mc.server);
1288
3242
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
3243
if(simple_poll != NULL)
3244
avahi_simple_poll_free(simple_poll);
1291
3245
1292
3246
if(gnutls_initialized){
1293
3247
gnutls_certificate_free_credentials(mc.cred);
1294
gnutls_global_deinit();
1295
3248
gnutls_dh_params_deinit(mc.dh_params);
1296
3249
}
1297
3250
1299
3252
gpgme_release(mc.ctx);
1300
3253
}
1301
3254
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
direntry->d_name);
1327
if(ret < 0){
1328
perror("asprintf");
1329
continue;
1330
}
1331
ret = remove(fullname);
1332
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
1335
}
1336
free(fullname);
1337
}
1338
closedir(d);
1339
}
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
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());
1344
3391
}
1345
3392
1346
3393
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0