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- Committer: Teddy Hogeborn
- Date: 2008-12-10 01:26:02 UTC
- mfrom: (237.1.2 mandos)
- Revision ID: teddy@fukt.bsnet.se-20081210012602-vhz3h75xkj24t340
First version of a somewhat complete D-Bus server interface. Also
change user/group name to "_mandos".
* debian/mandos.postinst: Rename old "mandos" user and group to
"_mandos"; create "_mandos" user and group
if none exist.
* debian/mandos-client.postinst: - '' -
* initramfs-tools-hook: Try "_mandos" before "mandos" as user and
group name.
* mandos (_datetime_to_dbus_struct): New; was previously local.
(Client.started): Renamed to "last_started". All users changed.
(Client.started): New; boolean.
(Client.dbus_object_path): New.
(Client.check_command): Renamed to "checker_command". All users
changed.
(Client.__init__): Set and use "self.dbus_object_path". Set
"self.started".
(Client.start): Update "self.started". Emit "self.PropertyChanged"
signals for both "started" and "last_started".
(Client.stop): Update "self.started". Emit "self.PropertyChanged"
signal for "started".
(Client.checker_callback): Take additional "command" argument. All
callers changed. Emit
"self.PropertyChanged" signal.
(Client.bump_timeout): Emit "self.PropertyChanged" signal for
"last_checked_ok".
(Client.start_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.stop_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.still_valid): Bug fix: use "getattr(self, started, False)"
instead of "self.started" in case this client
object is so new that the "started" attribute
has not been created yet.
(Client.IntervalChanged, Client.CheckerIsRunning, Client.GetChecker,
Client.GetCreated, Client.GetFingerprint, Client.GetHost,
Client.GetInterval, Client.GetName, Client.GetStarted,
Client.GetTimeout, Client.StateChanged, Client.TimeoutChanged):
Removed; all callers changed.
(Client.CheckerCompleted): Add "condition" and "command" arguments.
All callers changed.
(Client.GetAllProperties, Client.PropertyChanged): New.
(Client.StillValid): Renamed to "IsStillValid".
(Client.StartChecker): Changed to its own function to avoid the
return value from "Client.start_checker()".
(Client.Stop): Changed to its own function to avoid the return value
from "Client.stop()".
(main): Try "_mandos" before "mandos" as user and group name.
Removed inner function "remove_from_clients". New inner
class "MandosServer".
change user/group name to "_mandos".
* debian/mandos.postinst: Rename old "mandos" user and group to
"_mandos"; create "_mandos" user and group
if none exist.
* debian/mandos-client.postinst: - '' -
* initramfs-tools-hook: Try "_mandos" before "mandos" as user and
group name.
* mandos (_datetime_to_dbus_struct): New; was previously local.
(Client.started): Renamed to "last_started". All users changed.
(Client.started): New; boolean.
(Client.dbus_object_path): New.
(Client.check_command): Renamed to "checker_command". All users
changed.
(Client.__init__): Set and use "self.dbus_object_path". Set
"self.started".
(Client.start): Update "self.started". Emit "self.PropertyChanged"
signals for both "started" and "last_started".
(Client.stop): Update "self.started". Emit "self.PropertyChanged"
signal for "started".
(Client.checker_callback): Take additional "command" argument. All
callers changed. Emit
"self.PropertyChanged" signal.
(Client.bump_timeout): Emit "self.PropertyChanged" signal for
"last_checked_ok".
(Client.start_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.stop_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.still_valid): Bug fix: use "getattr(self, started, False)"
instead of "self.started" in case this client
object is so new that the "started" attribute
has not been created yet.
(Client.IntervalChanged, Client.CheckerIsRunning, Client.GetChecker,
Client.GetCreated, Client.GetFingerprint, Client.GetHost,
Client.GetInterval, Client.GetName, Client.GetStarted,
Client.GetTimeout, Client.StateChanged, Client.TimeoutChanged):
Removed; all callers changed.
(Client.CheckerCompleted): Add "condition" and "command" arguments.
All callers changed.
(Client.GetAllProperties, Client.PropertyChanged): New.
(Client.StillValid): Renamed to "IsStillValid".
(Client.StartChecker): Changed to its own function to avoid the
return value from "Client.start_checker()".
(Client.Stop): Changed to its own function to avoid the return value
from "Client.stop()".
(main): Try "_mandos" before "mandos" as user and group name.
Removed inner function "remove_from_clients". New inner
class "MandosServer".
- files added:
- debian/mandos-client.config
- files removed:
- debian/watch
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
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
12
* Copyright © 2008 Teddy Hogeborn
13
* Copyright © 2008 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
36
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
37
38
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), remove() */
39
stdout, ferror() */
40
40
#include <stdint.h> /* uint16_t, uint32_t */
41
41
#include <stddef.h> /* NULL, size_t, ssize_t */
42
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
44
#include <stdbool.h> /* bool, false, true */
43
srand() */
44
#include <stdbool.h> /* bool, true */
45
45
#include <string.h> /* memset(), strcmp(), strlen(),
46
46
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/ioctl.h> /* ioctl */
48
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
49
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, uid_t, gid_t, open(),
51
opendir(), DIR */
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
52
52
#include <sys/stat.h> /* open() */
53
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
inet_pton(), connect() */
54
struct in6_addr, inet_pton(),
55
connect() */
55
56
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir()
57
*/
58
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
59
strtoimax() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
60
59
#include <assert.h> /* assert() */
61
60
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
61
#include <time.h> /* time() */
63
62
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
63
SIOCSIFFLAGS, if_indextoname(),
65
64
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
65
#include <netinet/in.h>
69
66
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
67
getuid(), getgid(), setuid(),
71
68
setgid() */
72
69
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
70
#include <iso646.h> /* not, and */
74
71
#include <argp.h> /* struct argp_option, error_t, struct
75
72
argp_state, struct argp,
76
73
argp_parse(), ARGP_KEY_ARG,
77
74
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
81
82
#ifdef __linux__
83
#include <sys/klog.h> /* klogctl() */
84
#endif /* __linux__ */
85
75
86
76
/* Avahi */
87
77
/* All Avahi types, constants and functions
100
90
gnutls_*
101
91
init_gnutls_session(),
102
92
GNUTLS_* */
103
#include <gnutls/openpgp.h>
104
/* gnutls_certificate_set_openpgp_key_file(),
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
105
94
GNUTLS_OPENPGP_FMT_BASE64 */
106
95
107
96
/* GPGME */
133
122
gpgme_ctx_t ctx;
134
123
} mandos_context;
135
124
136
/* global context so signal handler can reach it*/
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
138
.dh_bits = 1024, .priority = "SECURE256"
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
140
141
125
/*
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
143
* bytes. "buffer_capacity" is how much is currently allocated,
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
144
128
* "buffer_length" is how much is already used.
145
129
*/
146
size_t incbuffer(char **buffer, size_t buffer_length,
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
147
131
size_t buffer_capacity){
148
if(buffer_length + BUFFER_SIZE > buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
149
133
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
150
if(buffer == NULL){
134
if (buffer == NULL){
151
135
return 0;
152
136
}
153
137
buffer_capacity += BUFFER_SIZE;
158
142
/*
159
143
* Initialize GPGME.
160
144
*/
161
static bool init_gpgme(const char *seckey,
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
162
146
const char *pubkey, const char *tempdir){
163
147
int ret;
164
148
gpgme_error_t rc;
166
150
167
151
168
152
/*
169
* Helper function to insert pub and seckey to the engine keyring.
153
* Helper function to insert pub and seckey to the enigne keyring.
170
154
*/
171
155
bool import_key(const char *filename){
172
156
int fd;
173
157
gpgme_data_t pgp_data;
174
158
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
160
if(fd == -1){
177
161
perror("open");
178
162
return false;
179
163
}
180
164
181
165
rc = gpgme_data_new_from_fd(&pgp_data, fd);
182
if(rc != GPG_ERR_NO_ERROR){
166
if (rc != GPG_ERR_NO_ERROR){
183
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
184
168
gpgme_strsource(rc), gpgme_strerror(rc));
185
169
return false;
186
170
}
187
171
188
rc = gpgme_op_import(mc.ctx, pgp_data);
189
if(rc != GPG_ERR_NO_ERROR){
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
190
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
191
175
gpgme_strsource(rc), gpgme_strerror(rc));
192
176
return false;
193
177
}
194
178
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
179
ret = TEMP_FAILURE_RETRY(close(fd));
196
180
if(ret == -1){
197
181
perror("close");
198
182
}
200
184
return true;
201
185
}
202
186
203
if(debug){
204
fprintf(stderr, "Initializing GPGME\n");
187
if (debug){
188
fprintf(stderr, "Initialize gpgme\n");
205
189
}
206
190
207
191
/* Init GPGME */
208
192
gpgme_check_version(NULL);
209
193
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
210
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
211
195
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
212
196
gpgme_strsource(rc), gpgme_strerror(rc));
213
197
return false;
214
198
}
215
199
216
200
/* Set GPGME home directory for the OpenPGP engine only */
217
rc = gpgme_get_engine_info(&engine_info);
218
if(rc != GPG_ERR_NO_ERROR){
201
rc = gpgme_get_engine_info (&engine_info);
202
if (rc != GPG_ERR_NO_ERROR){
219
203
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
220
204
gpgme_strsource(rc), gpgme_strerror(rc));
221
205
return false;
234
218
}
235
219
236
220
/* Create new GPGME "context" */
237
rc = gpgme_new(&(mc.ctx));
238
if(rc != GPG_ERR_NO_ERROR){
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
239
223
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
224
gpgme_strsource(rc), gpgme_strerror(rc));
241
225
return false;
242
226
}
243
227
244
if(not import_key(pubkey) or not import_key(seckey)){
228
if (not import_key(pubkey) or not import_key(seckey)){
245
229
return false;
246
230
}
247
231
252
236
* Decrypt OpenPGP data.
253
237
* Returns -1 on error
254
238
*/
255
static ssize_t pgp_packet_decrypt(const char *cryptotext,
256
size_t crypto_size,
257
char **plaintext){
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
258
243
gpgme_data_t dh_crypto, dh_plain;
259
244
gpgme_error_t rc;
260
245
ssize_t ret;
261
246
size_t plaintext_capacity = 0;
262
247
ssize_t plaintext_length = 0;
263
248
264
if(debug){
249
if (debug){
265
250
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
266
251
}
267
252
268
253
/* Create new GPGME data buffer from memory cryptotext */
269
254
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
270
255
0);
271
if(rc != GPG_ERR_NO_ERROR){
256
if (rc != GPG_ERR_NO_ERROR){
272
257
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
273
258
gpgme_strsource(rc), gpgme_strerror(rc));
274
259
return -1;
276
261
277
262
/* Create new empty GPGME data buffer for the plaintext */
278
263
rc = gpgme_data_new(&dh_plain);
279
if(rc != GPG_ERR_NO_ERROR){
264
if (rc != GPG_ERR_NO_ERROR){
280
265
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
281
266
gpgme_strsource(rc), gpgme_strerror(rc));
282
267
gpgme_data_release(dh_crypto);
285
270
286
271
/* Decrypt data from the cryptotext data buffer to the plaintext
287
272
data buffer */
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
289
if(rc != GPG_ERR_NO_ERROR){
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
274
if (rc != GPG_ERR_NO_ERROR){
290
275
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
291
276
gpgme_strsource(rc), gpgme_strerror(rc));
292
277
plaintext_length = -1;
293
if(debug){
278
if (debug){
294
279
gpgme_decrypt_result_t result;
295
result = gpgme_op_decrypt_result(mc.ctx);
296
if(result == NULL){
280
result = gpgme_op_decrypt_result(mc->ctx);
281
if (result == NULL){
297
282
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
298
283
} else {
299
284
fprintf(stderr, "Unsupported algorithm: %s\n",
326
311
}
327
312
328
313
/* Seek back to the beginning of the GPGME plaintext data buffer */
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
330
315
perror("gpgme_data_seek");
331
316
plaintext_length = -1;
332
317
goto decrypt_end;
334
319
335
320
*plaintext = NULL;
336
321
while(true){
337
plaintext_capacity = incbuffer(plaintext,
322
plaintext_capacity = adjustbuffer(plaintext,
338
323
(size_t)plaintext_length,
339
324
plaintext_capacity);
340
if(plaintext_capacity == 0){
341
perror("incbuffer");
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
342
327
plaintext_length = -1;
343
328
goto decrypt_end;
344
329
}
346
331
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
347
332
BUFFER_SIZE);
348
333
/* Print the data, if any */
349
if(ret == 0){
334
if (ret == 0){
350
335
/* EOF */
351
336
break;
352
337
}
376
361
return plaintext_length;
377
362
}
378
363
379
static const char * safer_gnutls_strerror(int value){
380
const char *ret = gnutls_strerror(value); /* Spurious warning from
381
-Wunreachable-code */
382
if(ret == NULL)
364
static const char * safer_gnutls_strerror (int value) {
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
366
if (ret == NULL)
383
367
ret = "(unknown)";
384
368
return ret;
385
369
}
390
374
fprintf(stderr, "GnuTLS: %s", string);
391
375
}
392
376
393
static int init_gnutls_global(const char *pubkeyfilename,
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
394
379
const char *seckeyfilename){
395
380
int ret;
396
381
399
384
}
400
385
401
386
ret = gnutls_global_init();
402
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
405
390
return -1;
406
391
}
407
392
408
if(debug){
393
if (debug){
409
394
/* "Use a log level over 10 to enable all debugging options."
410
395
* - GnuTLS manual
411
396
*/
414
399
}
415
400
416
401
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
418
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
424
gnutls_global_deinit();
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
425
408
return -1;
426
409
}
427
410
432
415
}
433
416
434
417
ret = gnutls_certificate_set_openpgp_key_file
435
(mc.cred, pubkeyfilename, seckeyfilename,
418
(mc->cred, pubkeyfilename, seckeyfilename,
436
419
GNUTLS_OPENPGP_FMT_BASE64);
437
if(ret != GNUTLS_E_SUCCESS){
420
if (ret != GNUTLS_E_SUCCESS) {
438
421
fprintf(stderr,
439
422
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
444
427
}
445
428
446
429
/* GnuTLS server initialization */
447
ret = gnutls_dh_params_init(&mc.dh_params);
448
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
451
434
goto globalfail;
452
435
}
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
454
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
457
440
goto globalfail;
458
441
}
459
442
460
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
461
444
462
445
return 0;
463
446
464
447
globalfail:
465
448
466
gnutls_certificate_free_credentials(mc.cred);
449
gnutls_certificate_free_credentials(mc->cred);
467
450
gnutls_global_deinit();
468
gnutls_dh_params_deinit(mc.dh_params);
451
gnutls_dh_params_deinit(mc->dh_params);
469
452
return -1;
470
453
}
471
454
472
static int init_gnutls_session(gnutls_session_t *session){
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
473
457
int ret;
474
458
/* GnuTLS session creation */
475
459
ret = gnutls_init(session, GNUTLS_SERVER);
476
if(ret != GNUTLS_E_SUCCESS){
460
if (ret != GNUTLS_E_SUCCESS){
477
461
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
462
safer_gnutls_strerror(ret));
479
463
}
480
464
481
465
{
482
466
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
484
if(ret != GNUTLS_E_SUCCESS){
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
485
469
fprintf(stderr, "Syntax error at: %s\n", err);
486
470
fprintf(stderr, "GnuTLS error: %s\n",
487
471
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
472
gnutls_deinit (*session);
489
473
return -1;
490
474
}
491
475
}
492
476
493
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
495
if(ret != GNUTLS_E_SUCCESS){
478
mc->cred);
479
if (ret != GNUTLS_E_SUCCESS) {
496
480
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
481
safer_gnutls_strerror(ret));
498
gnutls_deinit(*session);
482
gnutls_deinit (*session);
499
483
return -1;
500
484
}
501
485
502
486
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
487
gnutls_certificate_server_set_request (*session,
488
GNUTLS_CERT_IGNORE);
505
489
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
507
491
508
492
return 0;
509
493
}
515
499
/* Called when a Mandos server is found */
516
500
static int start_mandos_communication(const char *ip, uint16_t port,
517
501
AvahiIfIndex if_index,
518
int af){
502
mandos_context *mc){
519
503
int ret, tcp_sd;
520
ssize_t sret;
521
union {
522
struct sockaddr_in in;
523
struct sockaddr_in6 in6;
524
} to;
504
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
525
505
char *buffer = NULL;
526
506
char *decrypted_buffer;
527
507
size_t buffer_length = 0;
529
509
ssize_t decrypted_buffer_size;
530
510
size_t written;
531
511
int retval = 0;
512
char interface[IF_NAMESIZE];
532
513
gnutls_session_t session;
533
int pf; /* Protocol family */
534
535
switch(af){
536
case AF_INET6:
537
pf = PF_INET6;
538
break;
539
case AF_INET:
540
pf = PF_INET;
541
break;
542
default:
543
fprintf(stderr, "Bad address family: %d\n", af);
544
return -1;
545
}
546
547
ret = init_gnutls_session(&session);
548
if(ret != 0){
514
515
ret = init_gnutls_session (mc, &session);
516
if (ret != 0){
549
517
return -1;
550
518
}
551
519
552
520
if(debug){
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
521
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
554
522
"\n", ip, port);
555
523
}
556
524
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
if(tcp_sd < 0){
525
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
526
if(tcp_sd < 0) {
559
527
perror("socket");
560
528
return -1;
561
529
}
562
530
531
if(debug){
532
if(if_indextoname((unsigned int)if_index, interface) == NULL){
533
perror("if_indextoname");
534
return -1;
535
}
536
fprintf(stderr, "Binding to interface %s\n", interface);
537
}
538
563
539
memset(&to, 0, sizeof(to));
564
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
} else { /* IPv4 */
568
to.in.sin_family = (sa_family_t)af;
569
ret = inet_pton(af, ip, &to.in.sin_addr);
570
}
571
if(ret < 0 ){
540
to.in6.sin6_family = AF_INET6;
541
/* It would be nice to have a way to detect if we were passed an
542
IPv4 address here. Now we assume an IPv6 address. */
543
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
544
if (ret < 0 ){
572
545
perror("inet_pton");
573
546
return -1;
574
547
}
576
549
fprintf(stderr, "Bad address: %s\n", ip);
577
550
return -1;
578
551
}
579
if(af == AF_INET6){
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
-Wconversion and
582
-Wunreachable-code */
583
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
586
-Wunreachable-code*/
587
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
590
return -1;
591
}
592
/* Set the network interface number as scope */
593
to.in6.sin6_scope_id = (uint32_t)if_index;
594
}
595
} else {
596
to.in.sin_port = htons(port); /* Spurious warnings from
597
-Wconversion and
598
-Wunreachable-code */
599
}
552
to.in6.sin6_port = htons(port); /* Spurious warning */
553
554
to.in6.sin6_scope_id = (uint32_t)if_index;
600
555
601
556
if(debug){
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
char interface[IF_NAMESIZE];
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
606
} else {
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
609
}
610
} else {
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
613
}
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
616
const char *pcret;
617
if(af == AF_INET6){
618
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
619
sizeof(addrstr));
620
} else {
621
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
622
sizeof(addrstr));
623
}
624
if(pcret == NULL){
557
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
558
port);
559
char addrstr[INET6_ADDRSTRLEN] = "";
560
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
561
sizeof(addrstr)) == NULL){
625
562
perror("inet_ntop");
626
563
} else {
627
564
if(strcmp(addrstr, ip) != 0){
630
567
}
631
568
}
632
569
633
if(af == AF_INET6){
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
} else {
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
}
638
if(ret < 0){
570
ret = connect(tcp_sd, &to.in, sizeof(to));
571
if (ret < 0){
639
572
perror("connect");
640
573
return -1;
641
574
}
642
575
643
576
const char *out = mandos_protocol_version;
644
577
written = 0;
645
while(true){
578
while (true){
646
579
size_t out_size = strlen(out);
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
581
out_size - written));
649
if(ret == -1){
582
if (ret == -1){
650
583
perror("write");
651
584
retval = -1;
652
585
goto mandos_end;
655
588
if(written < out_size){
656
589
continue;
657
590
} else {
658
if(out == mandos_protocol_version){
591
if (out == mandos_protocol_version){
659
592
written = 0;
660
593
out = "\r\n";
661
594
} else {
668
601
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
602
}
670
603
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
604
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
672
605
673
606
do{
674
ret = gnutls_handshake(session);
607
ret = gnutls_handshake (session);
675
608
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
609
677
if(ret != GNUTLS_E_SUCCESS){
610
if (ret != GNUTLS_E_SUCCESS){
678
611
if(debug){
679
612
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
680
gnutls_perror(ret);
613
gnutls_perror (ret);
681
614
}
682
615
retval = -1;
683
616
goto mandos_end;
686
619
/* Read OpenPGP packet that contains the wanted password */
687
620
688
621
if(debug){
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
622
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
690
623
ip);
691
624
}
692
625
693
626
while(true){
694
buffer_capacity = incbuffer(&buffer, buffer_length,
627
buffer_capacity = adjustbuffer(&buffer, buffer_length,
695
628
buffer_capacity);
696
if(buffer_capacity == 0){
697
perror("incbuffer");
629
if (buffer_capacity == 0){
630
perror("adjustbuffer");
698
631
retval = -1;
699
632
goto mandos_end;
700
633
}
701
634
702
sret = gnutls_record_recv(session, buffer+buffer_length,
703
BUFFER_SIZE);
704
if(sret == 0){
635
ret = gnutls_record_recv(session, buffer+buffer_length,
636
BUFFER_SIZE);
637
if (ret == 0){
705
638
break;
706
639
}
707
if(sret < 0){
708
switch(sret){
640
if (ret < 0){
641
switch(ret){
709
642
case GNUTLS_E_INTERRUPTED:
710
643
case GNUTLS_E_AGAIN:
711
644
break;
712
645
case GNUTLS_E_REHANDSHAKE:
713
646
do{
714
ret = gnutls_handshake(session);
647
ret = gnutls_handshake (session);
715
648
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
if(ret < 0){
649
if (ret < 0){
717
650
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
718
gnutls_perror(ret);
651
gnutls_perror (ret);
719
652
retval = -1;
720
653
goto mandos_end;
721
654
}
724
657
fprintf(stderr, "Unknown error while reading data from"
725
658
" encrypted session with Mandos server\n");
726
659
retval = -1;
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
660
gnutls_bye (session, GNUTLS_SHUT_RDWR);
728
661
goto mandos_end;
729
662
}
730
663
} else {
731
buffer_length += (size_t) sret;
664
buffer_length += (size_t) ret;
732
665
}
733
666
}
734
667
736
669
fprintf(stderr, "Closing TLS session\n");
737
670
}
738
671
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
672
gnutls_bye (session, GNUTLS_SHUT_RDWR);
740
673
741
if(buffer_length > 0){
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
674
if (buffer_length > 0){
675
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
743
676
buffer_length,
744
677
&decrypted_buffer);
745
if(decrypted_buffer_size >= 0){
678
if (decrypted_buffer_size >= 0){
746
679
written = 0;
747
680
while(written < (size_t) decrypted_buffer_size){
748
ret = (int)fwrite(decrypted_buffer + written, 1,
749
(size_t)decrypted_buffer_size - written,
750
stdout);
681
ret = (int)fwrite (decrypted_buffer + written, 1,
682
(size_t)decrypted_buffer_size - written,
683
stdout);
751
684
if(ret == 0 and ferror(stdout)){
752
685
if(debug){
753
686
fprintf(stderr, "Error writing encrypted data: %s\n",
770
703
771
704
mandos_end:
772
705
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
706
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
774
707
if(ret == -1){
775
708
perror("close");
776
709
}
777
gnutls_deinit(session);
710
gnutls_deinit (session);
778
711
return retval;
779
712
}
780
713
781
714
static void resolve_callback(AvahiSServiceResolver *r,
782
715
AvahiIfIndex interface,
783
AvahiProtocol proto,
716
AVAHI_GCC_UNUSED AvahiProtocol protocol,
784
717
AvahiResolverEvent event,
785
718
const char *name,
786
719
const char *type,
791
724
AVAHI_GCC_UNUSED AvahiStringList *txt,
792
725
AVAHI_GCC_UNUSED AvahiLookupResultFlags
793
726
flags,
794
AVAHI_GCC_UNUSED void* userdata){
727
void* userdata) {
728
mandos_context *mc = userdata;
795
729
assert(r);
796
730
797
731
/* Called whenever a service has been resolved successfully or
798
732
timed out */
799
733
800
switch(event){
734
switch (event) {
801
735
default:
802
736
case AVAHI_RESOLVER_FAILURE:
803
737
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
804
738
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
avahi_strerror(avahi_server_errno(mc.server)));
739
avahi_strerror(avahi_server_errno(mc->server)));
806
740
break;
807
741
808
742
case AVAHI_RESOLVER_FOUND:
811
745
avahi_address_snprint(ip, sizeof(ip), address);
812
746
if(debug){
813
747
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
ip, (intmax_t)interface, port);
748
PRIu16 ") on port %d\n", name, host_name, ip,
749
interface, port);
816
750
}
817
int ret = start_mandos_communication(ip, port, interface,
818
avahi_proto_to_af(proto));
819
if(ret == 0){
820
avahi_simple_poll_quit(mc.simple_poll);
751
int ret = start_mandos_communication(ip, port, interface, mc);
752
if (ret == 0){
753
avahi_simple_poll_quit(mc->simple_poll);
821
754
}
822
755
}
823
756
}
824
757
avahi_s_service_resolver_free(r);
825
758
}
826
759
827
static void browse_callback(AvahiSServiceBrowser *b,
828
AvahiIfIndex interface,
829
AvahiProtocol protocol,
830
AvahiBrowserEvent event,
831
const char *name,
832
const char *type,
833
const char *domain,
834
AVAHI_GCC_UNUSED AvahiLookupResultFlags
835
flags,
836
AVAHI_GCC_UNUSED void* userdata){
760
static void browse_callback( AvahiSServiceBrowser *b,
761
AvahiIfIndex interface,
762
AvahiProtocol protocol,
763
AvahiBrowserEvent event,
764
const char *name,
765
const char *type,
766
const char *domain,
767
AVAHI_GCC_UNUSED AvahiLookupResultFlags
768
flags,
769
void* userdata) {
770
mandos_context *mc = userdata;
837
771
assert(b);
838
772
839
773
/* Called whenever a new services becomes available on the LAN or
840
774
is removed from the LAN */
841
775
842
switch(event){
776
switch (event) {
843
777
default:
844
778
case AVAHI_BROWSER_FAILURE:
845
779
846
780
fprintf(stderr, "(Avahi browser) %s\n",
847
avahi_strerror(avahi_server_errno(mc.server)));
848
avahi_simple_poll_quit(mc.simple_poll);
781
avahi_strerror(avahi_server_errno(mc->server)));
782
avahi_simple_poll_quit(mc->simple_poll);
849
783
return;
850
784
851
785
case AVAHI_BROWSER_NEW:
854
788
the callback function is called the Avahi server will free the
855
789
resolver for us. */
856
790
857
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
858
name, type, domain, protocol, 0,
859
resolve_callback, NULL) == NULL)
791
if (!(avahi_s_service_resolver_new(mc->server, interface,
792
protocol, name, type, domain,
793
AVAHI_PROTO_INET6, 0,
794
resolve_callback, mc)))
860
795
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
861
name, avahi_strerror(avahi_server_errno(mc.server)));
796
name, avahi_strerror(avahi_server_errno(mc->server)));
862
797
break;
863
798
864
799
case AVAHI_BROWSER_REMOVE:
873
808
}
874
809
}
875
810
876
sig_atomic_t quit_now = 0;
877
878
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
880
if(quit_now){
881
return;
882
}
883
quit_now = 1;
884
int old_errno = errno;
885
if(mc.simple_poll != NULL){
886
avahi_simple_poll_quit(mc.simple_poll);
887
}
888
errno = old_errno;
889
}
890
891
811
int main(int argc, char *argv[]){
892
AvahiSServiceBrowser *sb = NULL;
893
int error;
894
int ret;
895
intmax_t tmpmax;
896
char *tmp;
897
int exitcode = EXIT_SUCCESS;
898
const char *interface = "eth0";
899
struct ifreq network;
900
int sd;
901
uid_t uid;
902
gid_t gid;
903
char *connect_to = NULL;
904
char tempdir[] = "/tmp/mandosXXXXXX";
905
bool tempdir_created = false;
906
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
907
const char *seckey = PATHDIR "/" SECKEY;
908
const char *pubkey = PATHDIR "/" PUBKEY;
909
910
bool gnutls_initialized = false;
911
bool gpgme_initialized = false;
912
float delay = 2.5f;
913
914
struct sigaction old_sigterm_action;
915
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
916
917
{
918
struct argp_option options[] = {
919
{ .name = "debug", .key = 128,
920
.doc = "Debug mode", .group = 3 },
921
{ .name = "connect", .key = 'c',
922
.arg = "ADDRESS:PORT",
923
.doc = "Connect directly to a specific Mandos server",
924
.group = 1 },
925
{ .name = "interface", .key = 'i',
926
.arg = "NAME",
927
.doc = "Network interface that will be used to search for"
928
" Mandos servers",
929
.group = 1 },
930
{ .name = "seckey", .key = 's',
931
.arg = "FILE",
932
.doc = "OpenPGP secret key file base name",
933
.group = 1 },
934
{ .name = "pubkey", .key = 'p',
935
.arg = "FILE",
936
.doc = "OpenPGP public key file base name",
937
.group = 2 },
938
{ .name = "dh-bits", .key = 129,
939
.arg = "BITS",
940
.doc = "Bit length of the prime number used in the"
941
" Diffie-Hellman key exchange",
942
.group = 2 },
943
{ .name = "priority", .key = 130,
944
.arg = "STRING",
945
.doc = "GnuTLS priority string for the TLS handshake",
946
.group = 1 },
947
{ .name = "delay", .key = 131,
948
.arg = "SECONDS",
949
.doc = "Maximum delay to wait for interface startup",
950
.group = 2 },
951
{ .name = NULL }
952
};
953
954
error_t parse_opt(int key, char *arg,
955
struct argp_state *state){
956
switch(key){
957
case 128: /* --debug */
958
debug = true;
959
break;
960
case 'c': /* --connect */
961
connect_to = arg;
962
break;
963
case 'i': /* --interface */
964
interface = arg;
965
break;
966
case 's': /* --seckey */
967
seckey = arg;
968
break;
969
case 'p': /* --pubkey */
970
pubkey = arg;
971
break;
972
case 129: /* --dh-bits */
973
errno = 0;
974
tmpmax = strtoimax(arg, &tmp, 10);
975
if(errno != 0 or tmp == arg or *tmp != '\0'
976
or tmpmax != (typeof(mc.dh_bits))tmpmax){
977
fprintf(stderr, "Bad number of DH bits\n");
978
exit(EXIT_FAILURE);
979
}
980
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
981
break;
982
case 130: /* --priority */
983
mc.priority = arg;
984
break;
985
case 131: /* --delay */
986
errno = 0;
987
delay = strtof(arg, &tmp);
988
if(errno != 0 or tmp == arg or *tmp != '\0'){
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
991
}
992
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
996
break;
997
default:
998
return ARGP_ERR_UNKNOWN;
999
}
1000
return 0;
1001
}
1002
1003
struct argp argp = { .options = options, .parser = parse_opt,
1004
.args_doc = "",
1005
.doc = "Mandos client -- Get and decrypt"
1006
" passwords from a Mandos server" };
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1011
goto end;
1012
}
1013
}
1014
1015
if(not debug){
1016
avahi_set_log_function(empty_log);
1017
}
1018
1019
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1020
from the signal handler */
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1023
mc.simple_poll = avahi_simple_poll_new();
1024
if(mc.simple_poll == NULL){
1025
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1026
exitcode = EXIT_FAILURE;
1027
goto end;
1028
}
1029
1030
sigemptyset(&sigterm_action.sa_mask);
1031
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1032
if(ret == -1){
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
1035
goto end;
1036
}
1037
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1038
if(ret == -1){
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
1041
goto end;
1042
}
1043
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1044
if(ret == -1){
1045
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1047
goto end;
1048
}
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1050
if(ret == -1){
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1053
goto end;
1054
}
1055
1056
/* If the interface is down, bring it up */
1057
if(interface[0] != '\0'){
1058
#ifdef __linux__
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1060
messages to mess up the prompt */
1061
ret = klogctl(8, NULL, 5);
1062
bool restore_loglevel = true;
1063
if(ret == -1){
1064
restore_loglevel = false;
1065
perror("klogctl");
1066
}
1067
#endif /* __linux__ */
1068
1069
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1070
if(sd < 0){
1071
perror("socket");
1072
exitcode = EXIT_FAILURE;
1073
#ifdef __linux__
1074
if(restore_loglevel){
1075
ret = klogctl(7, NULL, 0);
1076
if(ret == -1){
1077
perror("klogctl");
1078
}
1079
}
1080
#endif /* __linux__ */
1081
goto end;
1082
}
1083
strcpy(network.ifr_name, interface);
1084
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1085
if(ret == -1){
1086
perror("ioctl SIOCGIFFLAGS");
1087
#ifdef __linux__
1088
if(restore_loglevel){
1089
ret = klogctl(7, NULL, 0);
1090
if(ret == -1){
1091
perror("klogctl");
1092
}
1093
}
1094
#endif /* __linux__ */
1095
exitcode = EXIT_FAILURE;
1096
goto end;
1097
}
1098
if((network.ifr_flags & IFF_UP) == 0){
1099
network.ifr_flags |= IFF_UP;
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1101
if(ret == -1){
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1104
#ifdef __linux__
1105
if(restore_loglevel){
1106
ret = klogctl(7, NULL, 0);
1107
if(ret == -1){
1108
perror("klogctl");
812
AvahiSServiceBrowser *sb = NULL;
813
int error;
814
int ret;
815
int exitcode = EXIT_SUCCESS;
816
const char *interface = "eth0";
817
struct ifreq network;
818
int sd;
819
uid_t uid;
820
gid_t gid;
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
823
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
826
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
832
833
{
834
struct argp_option options[] = {
835
{ .name = "debug", .key = 128,
836
.doc = "Debug mode", .group = 3 },
837
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
840
.group = 1 },
841
{ .name = "interface", .key = 'i',
842
.arg = "NAME",
843
.doc = "Interface that will be used to search for Mandos"
844
" servers",
845
.group = 1 },
846
{ .name = "seckey", .key = 's',
847
.arg = "FILE",
848
.doc = "OpenPGP secret key file base name",
849
.group = 1 },
850
{ .name = "pubkey", .key = 'p',
851
.arg = "FILE",
852
.doc = "OpenPGP public key file base name",
853
.group = 2 },
854
{ .name = "dh-bits", .key = 129,
855
.arg = "BITS",
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
858
.group = 2 },
859
{ .name = "priority", .key = 130,
860
.arg = "STRING",
861
.doc = "GnuTLS priority string for the TLS handshake",
862
.group = 1 },
863
{ .name = NULL }
864
};
865
866
error_t parse_opt (int key, char *arg,
867
struct argp_state *state) {
868
/* Get the INPUT argument from `argp_parse', which we know is
869
a pointer to our plugin list pointer. */
870
switch (key) {
871
case 128: /* --debug */
872
debug = true;
873
break;
874
case 'c': /* --connect */
875
connect_to = arg;
876
break;
877
case 'i': /* --interface */
878
interface = arg;
879
break;
880
case 's': /* --seckey */
881
seckey = arg;
882
break;
883
case 'p': /* --pubkey */
884
pubkey = arg;
885
break;
886
case 129: /* --dh-bits */
887
errno = 0;
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
889
if (errno){
890
perror("strtol");
891
exit(EXIT_FAILURE);
1109
892
}
893
break;
894
case 130: /* --priority */
895
mc.priority = arg;
896
break;
897
case ARGP_KEY_ARG:
898
argp_usage (state);
899
case ARGP_KEY_END:
900
break;
901
default:
902
return ARGP_ERR_UNKNOWN;
1110
903
}
1111
#endif /* __linux__ */
904
return 0;
905
}
906
907
struct argp argp = { .options = options, .parser = parse_opt,
908
.args_doc = "",
909
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
if (ret == ARGP_ERR_UNKNOWN){
913
fprintf(stderr, "Unknown error while parsing arguments\n");
914
exitcode = EXIT_FAILURE;
1112
915
goto end;
1113
916
}
1114
917
}
1115
/* sleep checking until interface is running */
1116
for(int i=0; i < delay * 4; i++){
918
919
/* If the interface is down, bring it up */
920
{
921
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
922
if(sd < 0) {
923
perror("socket");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
strcpy(network.ifr_name, interface);
1117
928
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1118
929
if(ret == -1){
1119
930
perror("ioctl SIOCGIFFLAGS");
1120
} else if(network.ifr_flags & IFF_RUNNING){
1121
break;
1122
}
1123
struct timespec sleeptime = { .tv_nsec = 250000000 };
1124
ret = nanosleep(&sleeptime, NULL);
1125
if(ret == -1 and errno != EINTR){
1126
perror("nanosleep");
1127
}
1128
}
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1130
if(ret == -1){
1131
perror("close");
1132
}
1133
#ifdef __linux__
1134
if(restore_loglevel){
1135
/* Restores kernel loglevel to default */
1136
ret = klogctl(7, NULL, 0);
931
exitcode = EXIT_FAILURE;
932
goto end;
933
}
934
if((network.ifr_flags & IFF_UP) == 0){
935
network.ifr_flags |= IFF_UP;
936
ret = ioctl(sd, SIOCSIFFLAGS, &network);
937
if(ret == -1){
938
perror("ioctl SIOCSIFFLAGS");
939
exitcode = EXIT_FAILURE;
940
goto end;
941
}
942
}
943
ret = TEMP_FAILURE_RETRY(close(sd));
1137
944
if(ret == -1){
1138
perror("klogctl");
945
perror("close");
1139
946
}
1140
947
}
1141
#endif /* __linux__ */
1142
}
1143
1144
uid = getuid();
1145
gid = getgid();
1146
1147
errno = 0;
1148
setgid(gid);
1149
if(ret == -1){
1150
perror("setgid");
1151
}
1152
1153
ret = setuid(uid);
1154
if(ret == -1){
1155
perror("setuid");
1156
}
1157
1158
ret = init_gnutls_global(pubkey, seckey);
1159
if(ret == -1){
1160
fprintf(stderr, "init_gnutls_global failed\n");
1161
exitcode = EXIT_FAILURE;
1162
goto end;
1163
} else {
1164
gnutls_initialized = true;
1165
}
1166
1167
if(mkdtemp(tempdir) == NULL){
1168
perror("mkdtemp");
1169
goto end;
1170
}
1171
tempdir_created = true;
1172
1173
if(not init_gpgme(pubkey, seckey, tempdir)){
1174
fprintf(stderr, "init_gpgme failed\n");
1175
exitcode = EXIT_FAILURE;
1176
goto end;
1177
} else {
1178
gpgme_initialized = true;
1179
}
1180
1181
if(interface[0] != '\0'){
948
949
uid = getuid();
950
gid = getgid();
951
952
ret = setuid(uid);
953
if (ret == -1){
954
perror("setuid");
955
}
956
957
setgid(gid);
958
if (ret == -1){
959
perror("setgid");
960
}
961
962
ret = init_gnutls_global(&mc, pubkey, seckey);
963
if (ret == -1){
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
966
goto end;
967
} else {
968
gnutls_initalized = true;
969
}
970
971
if(mkdtemp(tempdir) == NULL){
972
perror("mkdtemp");
973
tempdir[0] = '\0';
974
goto end;
975
}
976
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
} else {
982
gpgme_initalized = true;
983
}
984
1182
985
if_index = (AvahiIfIndex) if_nametoindex(interface);
1183
986
if(if_index == 0){
1184
987
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1188
}
1189
1190
if(connect_to != NULL){
1191
/* Connect directly, do not use Zeroconf */
1192
/* (Mainly meant for debugging) */
1193
char *address = strrchr(connect_to, ':');
1194
if(address == NULL){
1195
fprintf(stderr, "No colon in address\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
uint16_t port;
1200
errno = 0;
1201
tmpmax = strtoimax(address+1, &tmp, 10);
1202
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1203
or tmpmax != (uint16_t)tmpmax){
1204
fprintf(stderr, "Bad port number\n");
1205
exitcode = EXIT_FAILURE;
1206
goto end;
1207
}
1208
port = (uint16_t)tmpmax;
1209
*address = '\0';
1210
address = connect_to;
1211
/* Colon in address indicates IPv6 */
1212
int af;
1213
if(strchr(address, ':') != NULL){
1214
af = AF_INET6;
1215
} else {
1216
af = AF_INET;
1217
}
1218
ret = start_mandos_communication(address, port, if_index, af);
1219
if(ret < 0){
1220
exitcode = EXIT_FAILURE;
1221
} else {
1222
exitcode = EXIT_SUCCESS;
1223
}
1224
goto end;
1225
}
1226
1227
{
1228
AvahiServerConfig config;
1229
/* Do not publish any local Zeroconf records */
1230
avahi_server_config_init(&config);
1231
config.publish_hinfo = 0;
1232
config.publish_addresses = 0;
1233
config.publish_workstation = 0;
1234
config.publish_domain = 0;
1235
1236
/* Allocate a new server */
1237
mc.server = avahi_server_new(avahi_simple_poll_get
1238
(mc.simple_poll), &config, NULL,
1239
NULL, &error);
1240
1241
/* Free the Avahi configuration data */
1242
avahi_server_config_free(&config);
1243
}
1244
1245
/* Check if creating the Avahi server object succeeded */
1246
if(mc.server == NULL){
1247
fprintf(stderr, "Failed to create Avahi server: %s\n",
1248
avahi_strerror(error));
1249
exitcode = EXIT_FAILURE;
1250
goto end;
1251
}
1252
1253
/* Create the Avahi service browser */
1254
sb = avahi_s_service_browser_new(mc.server, if_index,
1255
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1256
NULL, 0, browse_callback, NULL);
1257
if(sb == NULL){
1258
fprintf(stderr, "Failed to create service browser: %s\n",
1259
avahi_strerror(avahi_server_errno(mc.server)));
1260
exitcode = EXIT_FAILURE;
1261
goto end;
1262
}
1263
1264
/* Run the main loop */
1265
1266
if(debug){
1267
fprintf(stderr, "Starting Avahi loop search\n");
1268
}
1269
1270
avahi_simple_poll_loop(mc.simple_poll);
1271
988
exit(EXIT_FAILURE);
989
}
990
991
if(connect_to != NULL){
992
/* Connect directly, do not use Zeroconf */
993
/* (Mainly meant for debugging) */
994
char *address = strrchr(connect_to, ':');
995
if(address == NULL){
996
fprintf(stderr, "No colon in address\n");
997
exitcode = EXIT_FAILURE;
998
goto end;
999
}
1000
errno = 0;
1001
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1002
if(errno){
1003
perror("Bad port number");
1004
exitcode = EXIT_FAILURE;
1005
goto end;
1006
}
1007
*address = '\0';
1008
address = connect_to;
1009
ret = start_mandos_communication(address, port, if_index, &mc);
1010
if(ret < 0){
1011
exitcode = EXIT_FAILURE;
1012
} else {
1013
exitcode = EXIT_SUCCESS;
1014
}
1015
goto end;
1016
}
1017
1018
if (not debug){
1019
avahi_set_log_function(empty_log);
1020
}
1021
1022
/* Initialize the pseudo-RNG for Avahi */
1023
srand((unsigned int) time(NULL));
1024
1025
/* Allocate main Avahi loop object */
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if (mc.simple_poll == NULL) {
1028
fprintf(stderr, "Avahi: Failed to create simple poll"
1029
" object.\n");
1030
exitcode = EXIT_FAILURE;
1031
goto end;
1032
}
1033
1034
{
1035
AvahiServerConfig config;
1036
/* Do not publish any local Zeroconf records */
1037
avahi_server_config_init(&config);
1038
config.publish_hinfo = 0;
1039
config.publish_addresses = 0;
1040
config.publish_workstation = 0;
1041
config.publish_domain = 0;
1042
1043
/* Allocate a new server */
1044
mc.server = avahi_server_new(avahi_simple_poll_get
1045
(mc.simple_poll), &config, NULL,
1046
NULL, &error);
1047
1048
/* Free the Avahi configuration data */
1049
avahi_server_config_free(&config);
1050
}
1051
1052
/* Check if creating the Avahi server object succeeded */
1053
if (mc.server == NULL) {
1054
fprintf(stderr, "Failed to create Avahi server: %s\n",
1055
avahi_strerror(error));
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* Create the Avahi service browser */
1061
sb = avahi_s_service_browser_new(mc.server, if_index,
1062
AVAHI_PROTO_INET6,
1063
"_mandos._tcp", NULL, 0,
1064
browse_callback, &mc);
1065
if (sb == NULL) {
1066
fprintf(stderr, "Failed to create service browser: %s\n",
1067
avahi_strerror(avahi_server_errno(mc.server)));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Run the main loop */
1073
1074
if (debug){
1075
fprintf(stderr, "Starting Avahi loop search\n");
1076
}
1077
1078
avahi_simple_poll_loop(mc.simple_poll);
1079
1272
1080
end:
1273
1274
if(debug){
1275
fprintf(stderr, "%s exiting\n", argv[0]);
1276
}
1277
1278
/* Cleanup things */
1279
if(sb != NULL)
1280
avahi_s_service_browser_free(sb);
1281
1282
if(mc.server != NULL)
1283
avahi_server_free(mc.server);
1284
1285
if(mc.simple_poll != NULL)
1286
avahi_simple_poll_free(mc.simple_poll);
1287
1288
if(gnutls_initialized){
1289
gnutls_certificate_free_credentials(mc.cred);
1290
gnutls_global_deinit();
1291
gnutls_dh_params_deinit(mc.dh_params);
1292
}
1293
1294
if(gpgme_initialized){
1295
gpgme_release(mc.ctx);
1296
}
1297
1298
/* Removes the temp directory used by GPGME */
1299
if(tempdir_created){
1300
DIR *d;
1301
struct dirent *direntry;
1302
d = opendir(tempdir);
1303
if(d == NULL){
1304
if(errno != ENOENT){
1081
1082
if (debug){
1083
fprintf(stderr, "%s exiting\n", argv[0]);
1084
}
1085
1086
/* Cleanup things */
1087
if (sb != NULL)
1088
avahi_s_service_browser_free(sb);
1089
1090
if (mc.server != NULL)
1091
avahi_server_free(mc.server);
1092
1093
if (mc.simple_poll != NULL)
1094
avahi_simple_poll_free(mc.simple_poll);
1095
1096
if (gnutls_initalized){
1097
gnutls_certificate_free_credentials(mc.cred);
1098
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1100
}
1101
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1104
}
1105
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1108
DIR *d;
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1111
if(d == NULL){
1305
1112
perror("opendir");
1306
}
1307
} else {
1308
while(true){
1309
direntry = readdir(d);
1310
if(direntry == NULL){
1311
break;
1312
}
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
continue;
1319
}
1320
char *fullname = NULL;
1321
ret = asprintf(&fullname, "%s/%s", tempdir,
1322
direntry->d_name);
1323
if(ret < 0){
1324
perror("asprintf");
1325
continue;
1326
}
1327
ret = remove(fullname);
1328
if(ret == -1){
1329
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1330
strerror(errno));
1331
}
1332
free(fullname);
1333
}
1334
closedir(d);
1335
}
1336
ret = rmdir(tempdir);
1337
if(ret == -1 and errno != ENOENT){
1338
perror("rmdir");
1339
}
1340
}
1341
1342
return exitcode;
1113
} else {
1114
while(true){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1117
break;
1118
}
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1122
direntry->d_name);
1123
if(ret < 0){
1124
perror("asprintf");
1125
continue;
1126
}
1127
ret = unlink(fullname);
1128
if(ret == -1){
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1131
}
1132
free(fullname);
1133
}
1134
}
1135
closedir(d);
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
1343
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0