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237.2.54
(compared to revision 237.7.262)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-01-31 10:33:17 UTC
- mfrom: (24.1.129 mandos)
- mto: (24.1.131 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090131103317-wzqvyr532sjcjt7u
Merge from Björn:
* mandos-ctl: New option "--remove-client". Only default to listing
clients if no clients were given on the command line.
* plugins.d/mandos-client.c: Lower kernel log level while bringing up
network interface. New option "--delay"
to control the maximum delay to wait for
running interface.
* plugins.d/mandos-client.xml (SYNOPSIS, OPTIONS): New option
"--delay".
* mandos-ctl: New option "--remove-client". Only default to listing
clients if no clients were given on the command line.
* plugins.d/mandos-client.c: Lower kernel log level while bringing up
network interface. New option "--delay"
to control the maximum delay to wait for
running interface.
* plugins.d/mandos-client.xml (SYNOPSIS, OPTIONS): New option
"--delay".
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
56
struct in6_addr, inet_pton(),
57
connect() */
58
#include <fcntl.h> /* open() */
61
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
60
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
#include <netinet/in.h>
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
80
74
#include <argp.h> /* struct argp_option, error_t, struct
81
75
argp_state, struct argp,
82
76
argp_parse(), ARGP_KEY_ARG,
83
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
99
#ifdef __linux__
100
78
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
102
79
103
80
/* Avahi */
104
81
/* All Avahi types, constants and functions
118
95
init_gnutls_session(),
119
96
GNUTLS_* */
120
97
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
98
/* gnutls_certificate_set_openpgp_key_file(),
99
GNUTLS_OPENPGP_FMT_BASE64 */
123
100
124
101
/* GPGME */
125
102
#include <gpgme.h> /* All GPGME types, constants and
133
110
#define PATHDIR "/conf/conf.d/mandos"
134
111
#define SECKEY "seckey.txt"
135
112
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
113
138
114
bool debug = false;
139
115
static const char mandos_protocol_version[] = "1";
140
116
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
117
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
118
160
119
/* Used for passing in values through the Avahi callback functions */
161
120
typedef struct {
121
AvahiSimplePoll *simple_poll;
162
122
AvahiServer *server;
163
123
gnutls_certificate_credentials_t cred;
164
124
unsigned int dh_bits;
165
125
gnutls_dh_params_t dh_params;
166
126
const char *priority;
167
127
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
128
} mandos_context;
172
129
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
130
/*
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
131
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
132
* "buffer_capacity" is how much is currently allocated,
201
133
* "buffer_length" is how much is already used.
202
134
*/
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
135
size_t adjustbuffer(char **buffer, size_t buffer_length,
136
size_t buffer_capacity){
206
137
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
138
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
139
if(buffer == NULL){
213
140
return 0;
214
141
}
215
*buffer = new_buf;
216
142
buffer_capacity += BUFFER_SIZE;
217
143
}
218
144
return buffer_capacity;
219
145
}
220
146
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
269
147
/*
270
148
* Initialize GPGME.
271
149
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
150
static bool init_gpgme(mandos_context *mc, const char *seckey,
151
const char *pubkey, const char *tempdir){
152
int ret;
277
153
gpgme_error_t rc;
278
154
gpgme_engine_info_t engine_info;
279
155
156
280
157
/*
281
158
* Helper function to insert pub and seckey to the engine keyring.
282
159
*/
283
bool import_key(const char * const filename){
284
int ret;
160
bool import_key(const char *filename){
285
161
int fd;
286
162
gpgme_data_t pgp_data;
287
163
288
164
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
165
if(fd == -1){
290
perror_plus("open");
166
perror("open");
291
167
return false;
292
168
}
293
169
294
170
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
171
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
172
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
173
gpgme_strsource(rc), gpgme_strerror(rc));
298
174
return false;
299
175
}
300
176
301
177
rc = gpgme_op_import(mc->ctx, pgp_data);
302
178
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
179
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
180
gpgme_strsource(rc), gpgme_strerror(rc));
305
181
return false;
306
182
}
307
183
308
184
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
185
if(ret == -1){
310
perror_plus("close");
186
perror("close");
311
187
}
312
188
gpgme_data_release(pgp_data);
313
189
return true;
314
190
}
315
191
316
192
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
193
fprintf(stderr, "Initialize gpgme\n");
318
194
}
319
195
320
196
/* Init GPGME */
321
197
gpgme_check_version(NULL);
322
198
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
199
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
200
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
201
gpgme_strsource(rc), gpgme_strerror(rc));
326
202
return false;
327
203
}
328
204
329
/* Set GPGME home directory for the OpenPGP engine only */
205
/* Set GPGME home directory for the OpenPGP engine only */
330
206
rc = gpgme_get_engine_info(&engine_info);
331
207
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
208
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
209
gpgme_strsource(rc), gpgme_strerror(rc));
334
210
return false;
335
211
}
336
212
while(engine_info != NULL){
342
218
engine_info = engine_info->next;
343
219
}
344
220
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
221
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
222
return false;
348
223
}
349
224
350
225
/* Create new GPGME "context" */
351
226
rc = gpgme_new(&(mc->ctx));
352
227
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
228
fprintf(stderr, "bad gpgme_new: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
356
230
return false;
357
231
}
358
232
360
234
return false;
361
235
}
362
236
363
return true;
237
return true;
364
238
}
365
239
366
240
/*
367
241
* Decrypt OpenPGP data.
368
242
* Returns -1 on error
369
243
*/
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
244
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
245
const char *cryptotext,
372
246
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
247
char **plaintext){
375
248
gpgme_data_t dh_crypto, dh_plain;
376
249
gpgme_error_t rc;
377
250
ssize_t ret;
379
252
ssize_t plaintext_length = 0;
380
253
381
254
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
255
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
256
}
384
257
385
258
/* Create new GPGME data buffer from memory cryptotext */
386
259
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
260
0);
388
261
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
262
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
263
gpgme_strsource(rc), gpgme_strerror(rc));
391
264
return -1;
392
265
}
393
266
394
267
/* Create new empty GPGME data buffer for the plaintext */
395
268
rc = gpgme_data_new(&dh_plain);
396
269
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
270
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
271
gpgme_strsource(rc), gpgme_strerror(rc));
400
272
gpgme_data_release(dh_crypto);
401
273
return -1;
402
274
}
405
277
data buffer */
406
278
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
279
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
410
282
plaintext_length = -1;
411
283
if(debug){
412
284
gpgme_decrypt_result_t result;
413
285
result = gpgme_op_decrypt_result(mc->ctx);
414
286
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
287
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
288
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
289
fprintf(stderr, "Unsupported algorithm: %s\n",
290
result->unsupported_algorithm);
291
fprintf(stderr, "Wrong key usage: %u\n",
292
result->wrong_key_usage);
421
293
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
294
fprintf(stderr, "File name: %s\n", result->file_name);
423
295
}
424
296
gpgme_recipient_t recipient;
425
297
recipient = result->recipients;
426
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
298
if(recipient){
299
while(recipient != NULL){
300
fprintf(stderr, "Public key algorithm: %s\n",
301
gpgme_pubkey_algo_name(recipient->pubkey_algo));
302
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
303
fprintf(stderr, "Secret key available: %s\n",
304
recipient->status == GPG_ERR_NO_SECKEY
305
? "No" : "Yes");
306
recipient = recipient->next;
307
}
435
308
}
436
309
}
437
310
}
439
312
}
440
313
441
314
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
315
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
316
}
444
317
445
318
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
319
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
320
perror("gpgme_data_seek");
448
321
plaintext_length = -1;
449
322
goto decrypt_end;
450
323
}
451
324
452
325
*plaintext = NULL;
453
326
while(true){
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
327
plaintext_capacity = adjustbuffer(plaintext,
328
(size_t)plaintext_length,
329
plaintext_capacity);
457
330
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
331
perror("adjustbuffer");
332
plaintext_length = -1;
333
goto decrypt_end;
461
334
}
462
335
463
336
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
468
341
break;
469
342
}
470
343
if(ret < 0){
471
perror_plus("gpgme_data_read");
344
perror("gpgme_data_read");
472
345
plaintext_length = -1;
473
346
goto decrypt_end;
474
347
}
476
349
}
477
350
478
351
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
352
fprintf(stderr, "Decrypted password is: ");
480
353
for(ssize_t i = 0; i < plaintext_length; i++){
481
354
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
355
}
493
366
return plaintext_length;
494
367
}
495
368
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
369
static const char * safer_gnutls_strerror(int value) {
370
const char *ret = gnutls_strerror(value); /* Spurious warning from
371
-Wunreachable-code */
499
372
if(ret == NULL)
500
373
ret = "(unknown)";
501
374
return ret;
502
375
}
503
376
504
377
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
378
static void debuggnutls(__attribute__((unused)) int level,
507
379
const char* string){
508
fprintf_plus(stderr, "GnuTLS: %s", string);
380
fprintf(stderr, "GnuTLS: %s", string);
509
381
}
510
382
511
__attribute__((nonnull, warn_unused_result))
512
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
383
static int init_gnutls_global(mandos_context *mc,
384
const char *pubkeyfilename,
385
const char *seckeyfilename){
515
386
int ret;
516
387
517
388
if(debug){
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
389
fprintf(stderr, "Initializing GnuTLS\n");
519
390
}
520
391
521
392
ret = gnutls_global_init();
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
393
if(ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "GnuTLS global_init: %s\n",
395
safer_gnutls_strerror(ret));
525
396
return -1;
526
397
}
527
398
534
405
}
535
406
536
407
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
408
gnutls_certificate_allocate_credentials(&mc->cred);
538
409
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
410
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
411
* from
412
* -Wunreachable-code
413
*/
414
safer_gnutls_strerror(ret));
541
415
gnutls_global_deinit();
542
416
return -1;
543
417
}
544
418
545
419
if(debug){
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
420
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
421
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
422
seckeyfilename);
550
423
}
551
424
552
425
ret = gnutls_certificate_set_openpgp_key_file
553
426
(mc->cred, pubkeyfilename, seckeyfilename,
554
427
GNUTLS_OPENPGP_FMT_BASE64);
555
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
428
if(ret != GNUTLS_E_SUCCESS) {
429
fprintf(stderr,
430
"Error[%d] while reading the OpenPGP key pair ('%s',"
431
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
432
fprintf(stderr, "The GnuTLS error is: %s\n",
433
safer_gnutls_strerror(ret));
561
434
goto globalfail;
562
435
}
563
436
564
437
/* GnuTLS server initialization */
565
438
ret = gnutls_dh_params_init(&mc->dh_params);
566
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
439
if(ret != GNUTLS_E_SUCCESS) {
440
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
441
" %s\n", safer_gnutls_strerror(ret));
570
442
goto globalfail;
571
443
}
572
444
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
445
if(ret != GNUTLS_E_SUCCESS) {
446
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
447
safer_gnutls_strerror(ret));
576
448
goto globalfail;
577
449
}
578
450
588
460
return -1;
589
461
}
590
462
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
463
static int init_gnutls_session(mandos_context *mc,
464
gnutls_session_t *session){
594
465
int ret;
595
466
/* GnuTLS session creation */
596
do {
597
ret = gnutls_init(session, GNUTLS_SERVER);
598
if(quit_now){
599
return -1;
600
}
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
467
ret = gnutls_init(session, GNUTLS_SERVER);
602
468
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
469
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
470
safer_gnutls_strerror(ret));
606
471
}
607
472
608
473
{
609
474
const char *err;
610
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
612
if(quit_now){
613
gnutls_deinit(*session);
614
return -1;
615
}
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
617
if(ret != GNUTLS_E_SUCCESS){
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
475
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
476
if(ret != GNUTLS_E_SUCCESS) {
477
fprintf(stderr, "Syntax error at: %s\n", err);
478
fprintf(stderr, "GnuTLS error: %s\n",
479
safer_gnutls_strerror(ret));
621
480
gnutls_deinit(*session);
622
481
return -1;
623
482
}
624
483
}
625
484
626
do {
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
629
if(quit_now){
630
gnutls_deinit(*session);
631
return -1;
632
}
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
634
if(ret != GNUTLS_E_SUCCESS){
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
485
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
486
mc->cred);
487
if(ret != GNUTLS_E_SUCCESS) {
488
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
489
safer_gnutls_strerror(ret));
637
490
gnutls_deinit(*session);
638
491
return -1;
639
492
}
640
493
641
494
/* ignore client certificate if any. */
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
495
gnutls_certificate_server_set_request(*session,
496
GNUTLS_CERT_IGNORE);
643
497
644
498
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
645
499
651
505
__attribute__((unused)) const char *txt){}
652
506
653
507
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
508
static int start_mandos_communication(const char *ip, uint16_t port,
656
509
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
658
int ret, tcp_sd = -1;
510
mandos_context *mc){
511
int ret, tcp_sd;
659
512
ssize_t sret;
660
struct sockaddr_storage to;
513
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
661
514
char *buffer = NULL;
662
char *decrypted_buffer = NULL;
515
char *decrypted_buffer;
663
516
size_t buffer_length = 0;
664
517
size_t buffer_capacity = 0;
518
ssize_t decrypted_buffer_size;
665
519
size_t written;
666
int retval = -1;
520
int retval = 0;
521
char interface[IF_NAMESIZE];
667
522
gnutls_session_t session;
668
int pf; /* Protocol family */
669
670
errno = 0;
671
672
if(quit_now){
673
errno = EINTR;
674
return -1;
675
}
676
677
switch(af){
678
case AF_INET6:
679
pf = PF_INET6;
680
break;
681
case AF_INET:
682
pf = PF_INET;
683
break;
684
default:
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
686
errno = EINVAL;
687
return -1;
688
}
689
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
523
524
ret = init_gnutls_session(mc, &session);
723
525
if(ret != 0){
724
526
return -1;
725
527
}
726
528
727
529
if(debug){
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
730
}
731
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
733
if(tcp_sd < 0){
734
int e = errno;
735
perror_plus("socket");
736
errno = e;
737
goto mandos_end;
738
}
739
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
530
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
531
"\n", ip, port);
532
}
533
534
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
535
if(tcp_sd < 0) {
536
perror("socket");
537
return -1;
538
}
539
540
if(debug){
541
if(if_indextoname((unsigned int)if_index, interface) == NULL){
542
perror("if_indextoname");
543
return -1;
544
}
545
fprintf(stderr, "Binding to interface %s\n", interface);
743
546
}
744
547
745
548
memset(&to, 0, sizeof(to));
746
if(af == AF_INET6){
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
749
} else { /* IPv4 */
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
752
}
549
to.in6.sin6_family = AF_INET6;
550
/* It would be nice to have a way to detect if we were passed an
551
IPv4 address here. Now we assume an IPv6 address. */
552
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
753
553
if(ret < 0 ){
754
int e = errno;
755
perror_plus("inet_pton");
756
errno = e;
757
goto mandos_end;
554
perror("inet_pton");
555
return -1;
758
556
}
759
557
if(ret == 0){
760
int e = errno;
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
762
errno = e;
763
goto mandos_end;
764
}
765
if(af == AF_INET6){
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
769
if(if_index == AVAHI_IF_UNSPEC){
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
772
errno = EINVAL;
773
goto mandos_end;
774
}
775
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
777
}
778
} else {
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
780
}
558
fprintf(stderr, "Bad address: %s\n", ip);
559
return -1;
560
}
561
to.in6.sin6_port = htons(port); /* Spurious warnings from
562
-Wconversion and
563
-Wunreachable-code */
781
564
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
785
}
565
to.in6.sin6_scope_id = (uint32_t)if_index;
786
566
787
567
if(debug){
788
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
789
char interface[IF_NAMESIZE];
790
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
perror_plus("if_indextoname");
792
} else {
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
568
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
569
port);
570
char addrstr[INET6_ADDRSTRLEN] = "";
571
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
572
sizeof(addrstr)) == NULL){
573
perror("inet_ntop");
574
} else {
575
if(strcmp(addrstr, ip) != 0){
576
fprintf(stderr, "Canonical address form: %s\n", addrstr);
795
577
}
796
} else {
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
799
}
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
802
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
807
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
812
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
819
}
820
}
821
822
if(quit_now){
823
errno = EINTR;
824
goto mandos_end;
825
}
826
827
if(af == AF_INET6){
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
830
} else {
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
833
}
578
}
579
}
580
581
ret = connect(tcp_sd, &to.in, sizeof(to));
834
582
if(ret < 0){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
int e = errno;
837
perror_plus("connect");
838
errno = e;
839
}
840
goto mandos_end;
841
}
842
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
583
perror("connect");
584
return -1;
846
585
}
847
586
848
587
const char *out = mandos_protocol_version;
850
589
while(true){
851
590
size_t out_size = strlen(out);
852
591
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
853
out_size - written));
592
out_size - written));
854
593
if(ret == -1){
855
int e = errno;
856
perror_plus("write");
857
errno = e;
594
perror("write");
595
retval = -1;
858
596
goto mandos_end;
859
597
}
860
598
written += (size_t)ret;
868
606
break;
869
607
}
870
608
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
609
}
877
610
878
611
if(debug){
879
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
880
}
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
892
893
if(quit_now){
894
errno = EINTR;
895
goto mandos_end;
896
}
897
898
do {
612
fprintf(stderr, "Establishing TLS session with %s\n", ip);
613
}
614
615
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
616
617
do{
899
618
ret = gnutls_handshake(session);
900
if(quit_now){
901
errno = EINTR;
902
goto mandos_end;
903
}
904
619
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
905
620
906
621
if(ret != GNUTLS_E_SUCCESS){
907
622
if(debug){
908
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
623
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
909
624
gnutls_perror(ret);
910
625
}
911
errno = EPROTO;
626
retval = -1;
912
627
goto mandos_end;
913
628
}
914
629
915
630
/* Read OpenPGP packet that contains the wanted password */
916
631
917
632
if(debug){
918
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
919
" %s\n", ip);
633
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
634
ip);
920
635
}
921
636
922
637
while(true){
923
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
929
buffer_capacity = incbuffer(&buffer, buffer_length,
930
buffer_capacity);
638
buffer_capacity = adjustbuffer(&buffer, buffer_length,
639
buffer_capacity);
931
640
if(buffer_capacity == 0){
932
int e = errno;
933
perror_plus("incbuffer");
934
errno = e;
935
goto mandos_end;
936
}
937
938
if(quit_now){
939
errno = EINTR;
641
perror("adjustbuffer");
642
retval = -1;
940
643
goto mandos_end;
941
644
}
942
645
951
654
case GNUTLS_E_AGAIN:
952
655
break;
953
656
case GNUTLS_E_REHANDSHAKE:
954
do {
657
do{
955
658
ret = gnutls_handshake(session);
956
957
if(quit_now){
958
errno = EINTR;
959
goto mandos_end;
960
}
961
659
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
962
660
if(ret < 0){
963
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
964
"***\n");
661
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
965
662
gnutls_perror(ret);
966
errno = EPROTO;
663
retval = -1;
967
664
goto mandos_end;
968
665
}
969
666
break;
970
667
default:
971
fprintf_plus(stderr, "Unknown error while reading data from"
972
" encrypted session with Mandos server\n");
668
fprintf(stderr, "Unknown error while reading data from"
669
" encrypted session with Mandos server\n");
670
retval = -1;
973
671
gnutls_bye(session, GNUTLS_SHUT_RDWR);
974
errno = EIO;
975
672
goto mandos_end;
976
673
}
977
674
} else {
980
677
}
981
678
982
679
if(debug){
983
fprintf_plus(stderr, "Closing TLS session\n");
984
}
985
986
if(quit_now){
987
errno = EINTR;
988
goto mandos_end;
989
}
990
991
do {
992
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
993
if(quit_now){
994
errno = EINTR;
995
goto mandos_end;
996
}
997
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
fprintf(stderr, "Closing TLS session\n");
681
}
682
683
gnutls_bye(session, GNUTLS_SHUT_RDWR);
998
684
999
685
if(buffer_length > 0){
1000
ssize_t decrypted_buffer_size;
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
686
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
687
buffer_length,
688
&decrypted_buffer);
1003
689
if(decrypted_buffer_size >= 0){
1004
1005
690
written = 0;
1006
691
while(written < (size_t) decrypted_buffer_size){
1007
if(quit_now){
1008
errno = EINTR;
1009
goto mandos_end;
1010
}
1011
1012
692
ret = (int)fwrite(decrypted_buffer + written, 1,
1013
693
(size_t)decrypted_buffer_size - written,
1014
694
stdout);
1015
695
if(ret == 0 and ferror(stdout)){
1016
int e = errno;
1017
696
if(debug){
1018
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1019
strerror(errno));
697
fprintf(stderr, "Error writing encrypted data: %s\n",
698
strerror(errno));
1020
699
}
1021
errno = e;
1022
goto mandos_end;
700
retval = -1;
701
break;
1023
702
}
1024
703
written += (size_t)ret;
1025
704
}
1026
retval = 0;
705
free(decrypted_buffer);
706
} else {
707
retval = -1;
1027
708
}
709
} else {
710
retval = -1;
1028
711
}
1029
712
1030
713
/* Shutdown procedure */
1031
714
1032
715
mandos_end:
1033
{
1034
int e = errno;
1035
free(decrypted_buffer);
1036
free(buffer);
1037
if(tcp_sd >= 0){
1038
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1039
}
1040
if(ret == -1){
1041
if(e == 0){
1042
e = errno;
1043
}
1044
perror_plus("close");
1045
}
1046
gnutls_deinit(session);
1047
errno = e;
1048
if(quit_now){
1049
errno = EINTR;
1050
retval = -1;
1051
}
716
free(buffer);
717
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
718
if(ret == -1){
719
perror("close");
1052
720
}
721
gnutls_deinit(session);
1053
722
return retval;
1054
723
}
1055
724
1056
__attribute__((nonnull))
1057
725
static void resolve_callback(AvahiSServiceResolver *r,
1058
726
AvahiIfIndex interface,
1059
AvahiProtocol proto,
727
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1060
728
AvahiResolverEvent event,
1061
729
const char *name,
1062
730
const char *type,
1067
735
AVAHI_GCC_UNUSED AvahiStringList *txt,
1068
736
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1069
737
flags,
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
738
void* userdata) {
739
mandos_context *mc = userdata;
740
assert(r);
1074
741
1075
742
/* Called whenever a service has been resolved successfully or
1076
743
timed out */
1077
744
1078
if(quit_now){
1079
return;
1080
}
1081
1082
switch(event){
745
switch(event) {
1083
746
default:
1084
747
case AVAHI_RESOLVER_FAILURE:
1085
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1086
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1087
domain,
1088
avahi_strerror(avahi_server_errno
1089
(((mandos_context*)mc)->server)));
748
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
749
" of type '%s' in domain '%s': %s\n", name, type, domain,
750
avahi_strerror(avahi_server_errno(mc->server)));
1090
751
break;
1091
752
1092
753
case AVAHI_RESOLVER_FOUND:
1094
755
char ip[AVAHI_ADDRESS_STR_MAX];
1095
756
avahi_address_snprint(ip, sizeof(ip), address);
1096
757
if(debug){
1097
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1098
PRIdMAX ") on port %" PRIu16 "\n", name,
1099
host_name, ip, (intmax_t)interface, port);
758
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
759
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
760
ip, (intmax_t)interface, port);
1100
761
}
1101
int ret = start_mandos_communication(ip, (in_port_t)port,
1102
interface,
1103
avahi_proto_to_af(proto),
1104
mc);
762
int ret = start_mandos_communication(ip, port, interface, mc);
1105
763
if(ret == 0){
1106
avahi_simple_poll_quit(simple_poll);
1107
} else {
1108
if(not add_server(ip, (in_port_t)port, interface,
1109
avahi_proto_to_af(proto),
1110
&((mandos_context*)mc)->current_server)){
1111
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1112
" list\n", name);
1113
}
764
avahi_simple_poll_quit(mc->simple_poll);
1114
765
}
1115
766
}
1116
767
}
1117
768
avahi_s_service_resolver_free(r);
1118
769
}
1119
770
1120
static void browse_callback(AvahiSServiceBrowser *b,
1121
AvahiIfIndex interface,
1122
AvahiProtocol protocol,
1123
AvahiBrowserEvent event,
1124
const char *name,
1125
const char *type,
1126
const char *domain,
1127
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1128
flags,
1129
void *mc){
1130
if(b == NULL){
1131
return;
1132
}
771
static void browse_callback( AvahiSServiceBrowser *b,
772
AvahiIfIndex interface,
773
AvahiProtocol protocol,
774
AvahiBrowserEvent event,
775
const char *name,
776
const char *type,
777
const char *domain,
778
AVAHI_GCC_UNUSED AvahiLookupResultFlags
779
flags,
780
void* userdata) {
781
mandos_context *mc = userdata;
782
assert(b);
1133
783
1134
784
/* Called whenever a new services becomes available on the LAN or
1135
785
is removed from the LAN */
1136
786
1137
if(quit_now){
1138
return;
1139
}
1140
1141
switch(event){
787
switch(event) {
1142
788
default:
1143
789
case AVAHI_BROWSER_FAILURE:
1144
790
1145
fprintf_plus(stderr, "(Avahi browser) %s\n",
1146
avahi_strerror(avahi_server_errno
1147
(((mandos_context*)mc)->server)));
1148
avahi_simple_poll_quit(simple_poll);
791
fprintf(stderr, "(Avahi browser) %s\n",
792
avahi_strerror(avahi_server_errno(mc->server)));
793
avahi_simple_poll_quit(mc->simple_poll);
1149
794
return;
1150
795
1151
796
case AVAHI_BROWSER_NEW:
1154
799
the callback function is called the Avahi server will free the
1155
800
resolver for us. */
1156
801
1157
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1158
interface, protocol, name, type,
1159
domain, protocol, 0,
1160
resolve_callback, mc) == NULL)
1161
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1162
" %s\n", name,
1163
avahi_strerror(avahi_server_errno
1164
(((mandos_context*)mc)->server)));
802
if(!(avahi_s_service_resolver_new(mc->server, interface,
803
protocol, name, type, domain,
804
AVAHI_PROTO_INET6, 0,
805
resolve_callback, mc)))
806
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
807
name, avahi_strerror(avahi_server_errno(mc->server)));
1165
808
break;
1166
809
1167
810
case AVAHI_BROWSER_REMOVE:
1170
813
case AVAHI_BROWSER_ALL_FOR_NOW:
1171
814
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1172
815
if(debug){
1173
fprintf_plus(stderr, "No Mandos server found, still"
1174
" searching...\n");
816
fprintf(stderr, "No Mandos server found, still searching...\n");
1175
817
}
1176
818
break;
1177
819
}
1178
820
}
1179
821
1180
/* Signal handler that stops main loop after SIGTERM */
1181
static void handle_sigterm(int sig){
1182
if(quit_now){
1183
return;
1184
}
1185
quit_now = 1;
1186
signal_received = sig;
1187
int old_errno = errno;
1188
/* set main loop to exit */
1189
if(simple_poll != NULL){
1190
avahi_simple_poll_quit(simple_poll);
1191
}
1192
errno = old_errno;
1193
}
1194
1195
__attribute__((nonnull, warn_unused_result))
1196
bool get_flags(const char *ifname, struct ifreq *ifr){
1197
int ret;
1198
error_t ret_errno;
1199
1200
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1201
if(s < 0){
1202
ret_errno = errno;
1203
perror_plus("socket");
1204
errno = ret_errno;
1205
return false;
1206
}
1207
strcpy(ifr->ifr_name, ifname);
1208
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1209
if(ret == -1){
1210
if(debug){
1211
ret_errno = errno;
1212
perror_plus("ioctl SIOCGIFFLAGS");
1213
errno = ret_errno;
1214
}
1215
return false;
1216
}
1217
return true;
1218
}
1219
1220
__attribute__((nonnull, warn_unused_result))
1221
bool good_flags(const char *ifname, const struct ifreq *ifr){
1222
1223
/* Reject the loopback device */
1224
if(ifr->ifr_flags & IFF_LOOPBACK){
1225
if(debug){
1226
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1227
ifname);
1228
}
1229
return false;
1230
}
1231
/* Accept point-to-point devices only if connect_to is specified */
1232
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1233
if(debug){
1234
fprintf_plus(stderr, "Accepting point-to-point interface"
1235
" \"%s\"\n", ifname);
1236
}
1237
return true;
1238
}
1239
/* Otherwise, reject non-broadcast-capable devices */
1240
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1241
if(debug){
1242
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1243
" \"%s\"\n", ifname);
1244
}
1245
return false;
1246
}
1247
/* Reject non-ARP interfaces (including dummy interfaces) */
1248
if(ifr->ifr_flags & IFF_NOARP){
1249
if(debug){
1250
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1251
ifname);
1252
}
1253
return false;
1254
}
1255
1256
/* Accept this device */
1257
if(debug){
1258
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1259
}
1260
return true;
1261
}
1262
1263
/*
1264
* This function determines if a directory entry in /sys/class/net
1265
* corresponds to an acceptable network device.
1266
* (This function is passed to scandir(3) as a filter function.)
1267
*/
1268
__attribute__((nonnull, warn_unused_result))
1269
int good_interface(const struct dirent *if_entry){
1270
if(if_entry->d_name[0] == '.'){
1271
return 0;
1272
}
1273
1274
struct ifreq ifr;
1275
if(not get_flags(if_entry->d_name, &ifr)){
1276
if(debug){
1277
fprintf_plus(stderr, "Failed to get flags for interface "
1278
"\"%s\"\n", if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
1283
if(not good_flags(if_entry->d_name, &ifr)){
1284
return 0;
1285
}
1286
return 1;
1287
}
1288
1289
/*
1290
* This function determines if a network interface is up.
1291
*/
1292
__attribute__((nonnull, warn_unused_result))
1293
bool interface_is_up(const char *interface){
1294
struct ifreq ifr;
1295
if(not get_flags(interface, &ifr)){
1296
if(debug){
1297
fprintf_plus(stderr, "Failed to get flags for interface "
1298
"\"%s\"\n", interface);
1299
}
1300
return false;
1301
}
1302
1303
return (bool)(ifr.ifr_flags & IFF_UP);
1304
}
1305
1306
/*
1307
* This function determines if a network interface is running
1308
*/
1309
__attribute__((nonnull, warn_unused_result))
1310
bool interface_is_running(const char *interface){
1311
struct ifreq ifr;
1312
if(not get_flags(interface, &ifr)){
1313
if(debug){
1314
fprintf_plus(stderr, "Failed to get flags for interface "
1315
"\"%s\"\n", interface);
1316
}
1317
return false;
1318
}
1319
1320
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1321
}
1322
1323
__attribute__((nonnull, pure, warn_unused_result))
1324
int notdotentries(const struct dirent *direntry){
1325
/* Skip "." and ".." */
1326
if(direntry->d_name[0] == '.'
1327
and (direntry->d_name[1] == '\0'
1328
or (direntry->d_name[1] == '.'
1329
and direntry->d_name[2] == '\0'))){
1330
return 0;
1331
}
1332
return 1;
1333
}
1334
1335
/* Is this directory entry a runnable program? */
1336
__attribute__((nonnull, warn_unused_result))
1337
int runnable_hook(const struct dirent *direntry){
1338
int ret;
1339
size_t sret;
1340
struct stat st;
1341
1342
if((direntry->d_name)[0] == '\0'){
1343
/* Empty name? */
1344
return 0;
1345
}
1346
1347
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1348
"abcdefghijklmnopqrstuvwxyz"
1349
"0123456789"
1350
"_.-");
1351
if((direntry->d_name)[sret] != '\0'){
1352
/* Contains non-allowed characters */
1353
if(debug){
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1355
direntry->d_name);
1356
}
1357
return 0;
1358
}
1359
1360
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1361
if(ret == -1){
1362
if(debug){
1363
perror_plus("Could not stat hook");
1364
}
1365
return 0;
1366
}
1367
if(not (S_ISREG(st.st_mode))){
1368
/* Not a regular file */
1369
if(debug){
1370
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1371
direntry->d_name);
1372
}
1373
return 0;
1374
}
1375
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1376
/* Not executable */
1377
if(debug){
1378
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1379
direntry->d_name);
1380
}
1381
return 0;
1382
}
1383
if(debug){
1384
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1385
direntry->d_name);
1386
}
1387
return 1;
1388
}
1389
1390
__attribute__((nonnull, warn_unused_result))
1391
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1392
mandos_context *mc){
1393
int ret;
1394
struct timespec now;
1395
struct timespec waited_time;
1396
intmax_t block_time;
1397
1398
while(true){
1399
if(mc->current_server == NULL){
1400
if(debug){
1401
fprintf_plus(stderr, "Wait until first server is found."
1402
" No timeout!\n");
1403
}
1404
ret = avahi_simple_poll_iterate(s, -1);
1405
} else {
1406
if(debug){
1407
fprintf_plus(stderr, "Check current_server if we should run"
1408
" it, or wait\n");
1409
}
1410
/* the current time */
1411
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1412
if(ret == -1){
1413
perror_plus("clock_gettime");
1414
return -1;
1415
}
1416
/* Calculating in ms how long time between now and server
1417
who we visted longest time ago. Now - last seen. */
1418
waited_time.tv_sec = (now.tv_sec
1419
- mc->current_server->last_seen.tv_sec);
1420
waited_time.tv_nsec = (now.tv_nsec
1421
- mc->current_server->last_seen.tv_nsec);
1422
/* total time is 10s/10,000ms.
1423
Converting to s from ms by dividing by 1,000,
1424
and ns to ms by dividing by 1,000,000. */
1425
block_time = ((retry_interval
1426
- ((intmax_t)waited_time.tv_sec * 1000))
1427
- ((intmax_t)waited_time.tv_nsec / 1000000));
1428
1429
if(debug){
1430
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1431
block_time);
1432
}
1433
1434
if(block_time <= 0){
1435
ret = start_mandos_communication(mc->current_server->ip,
1436
mc->current_server->port,
1437
mc->current_server->if_index,
1438
mc->current_server->af, mc);
1439
if(ret == 0){
1440
avahi_simple_poll_quit(s);
1441
return 0;
1442
}
1443
ret = clock_gettime(CLOCK_MONOTONIC,
1444
&mc->current_server->last_seen);
1445
if(ret == -1){
1446
perror_plus("clock_gettime");
1447
return -1;
1448
}
1449
mc->current_server = mc->current_server->next;
1450
block_time = 0; /* Call avahi to find new Mandos
1451
servers, but don't block */
1452
}
1453
1454
ret = avahi_simple_poll_iterate(s, (int)block_time);
1455
}
1456
if(ret != 0){
1457
if(ret > 0 or errno != EINTR){
1458
return (ret != 1) ? ret : 0;
1459
}
1460
}
1461
}
1462
}
1463
1464
/* Set effective uid to 0, return errno */
1465
__attribute__((warn_unused_result))
1466
error_t raise_privileges(void){
1467
error_t old_errno = errno;
1468
error_t ret_errno = 0;
1469
if(seteuid(0) == -1){
1470
ret_errno = errno;
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Set effective and real user ID to 0. Return errno. */
1477
__attribute__((warn_unused_result))
1478
error_t raise_privileges_permanently(void){
1479
error_t old_errno = errno;
1480
error_t ret_errno = raise_privileges();
1481
if(ret_errno != 0){
1482
errno = old_errno;
1483
return ret_errno;
1484
}
1485
if(setuid(0) == -1){
1486
ret_errno = errno;
1487
}
1488
errno = old_errno;
1489
return ret_errno;
1490
}
1491
1492
/* Set effective user ID to unprivileged saved user ID */
1493
__attribute__((warn_unused_result))
1494
error_t lower_privileges(void){
1495
error_t old_errno = errno;
1496
error_t ret_errno = 0;
1497
if(seteuid(uid) == -1){
1498
ret_errno = errno;
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
}
1512
errno = old_errno;
1513
return ret_errno;
1514
}
1515
1516
__attribute__((nonnull))
1517
void run_network_hooks(const char *mode, const char *interface,
1518
const float delay){
1519
struct dirent **direntries = NULL;
1520
if(hookdir_fd == -1){
1521
hookdir_fd = open(hookdir, O_RDONLY);
1522
if(hookdir_fd == -1){
1523
if(errno == ENOENT){
1524
if(debug){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1527
}
1528
} else {
1529
perror_plus("open");
1530
}
1531
return;
1532
}
1533
}
1534
#ifdef __GLIBC__
1535
#if __GLIBC_PREREQ(2, 15)
1536
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1537
runnable_hook, alphasort);
1538
#else /* not __GLIBC_PREREQ(2, 15) */
1539
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1540
alphasort);
1541
#endif /* not __GLIBC_PREREQ(2, 15) */
1542
#else /* not __GLIBC__ */
1543
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1544
alphasort);
1545
#endif /* not __GLIBC__ */
1546
if(numhooks == -1){
1547
perror_plus("scandir");
1548
return;
1549
}
1550
struct dirent *direntry;
1551
int ret;
1552
int devnull = open("/dev/null", O_RDONLY);
1553
for(int i = 0; i < numhooks; i++){
1554
direntry = direntries[i];
1555
if(debug){
1556
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1557
direntry->d_name);
1558
}
1559
pid_t hook_pid = fork();
1560
if(hook_pid == 0){
1561
/* Child */
1562
/* Raise privileges */
1563
errno = raise_privileges_permanently();
1564
if(errno != 0){
1565
perror_plus("Failed to raise privileges");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Set group */
1569
errno = 0;
1570
ret = setgid(0);
1571
if(ret == -1){
1572
perror_plus("setgid");
1573
_exit(EX_NOPERM);
1574
}
1575
/* Reset supplementary groups */
1576
errno = 0;
1577
ret = setgroups(0, NULL);
1578
if(ret == -1){
1579
perror_plus("setgroups");
1580
_exit(EX_NOPERM);
1581
}
1582
ret = dup2(devnull, STDIN_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(devnull, STDIN_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = close(devnull);
1588
if(ret == -1){
1589
perror_plus("close");
1590
_exit(EX_OSERR);
1591
}
1592
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1593
if(ret == -1){
1594
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("DEVICE", interface, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1608
if(ret == -1){
1609
perror_plus("setenv");
1610
_exit(EX_OSERR);
1611
}
1612
ret = setenv("MODE", mode, 1);
1613
if(ret == -1){
1614
perror_plus("setenv");
1615
_exit(EX_OSERR);
1616
}
1617
char *delaystring;
1618
ret = asprintf(&delaystring, "%f", (double)delay);
1619
if(ret == -1){
1620
perror_plus("asprintf");
1621
_exit(EX_OSERR);
1622
}
1623
ret = setenv("DELAY", delaystring, 1);
1624
if(ret == -1){
1625
free(delaystring);
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
free(delaystring);
1630
if(connect_to != NULL){
1631
ret = setenv("CONNECT", connect_to, 1);
1632
if(ret == -1){
1633
perror_plus("setenv");
1634
_exit(EX_OSERR);
1635
}
1636
}
1637
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1638
if(hook_fd == -1){
1639
perror_plus("openat");
1640
_exit(EXIT_FAILURE);
1641
}
1642
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1643
perror_plus("close");
1644
_exit(EXIT_FAILURE);
1645
}
1646
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1647
environ) == -1){
1648
perror_plus("fexecve");
1649
_exit(EXIT_FAILURE);
1650
}
1651
} else {
1652
int status;
1653
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1654
perror_plus("waitpid");
1655
continue;
1656
}
1657
if(WIFEXITED(status)){
1658
if(WEXITSTATUS(status) != 0){
1659
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1660
" with status %d\n", direntry->d_name,
1661
WEXITSTATUS(status));
1662
continue;
1663
}
1664
} else if(WIFSIGNALED(status)){
1665
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1666
" signal %d\n", direntry->d_name,
1667
WTERMSIG(status));
1668
continue;
1669
} else {
1670
fprintf_plus(stderr, "Warning: network hook \"%s\""
1671
" crashed\n", direntry->d_name);
1672
continue;
1673
}
1674
}
1675
if(debug){
1676
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1677
direntry->d_name);
1678
}
1679
}
1680
free(direntries);
1681
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1682
perror_plus("close");
1683
} else {
1684
hookdir_fd = -1;
1685
}
1686
close(devnull);
1687
}
1688
1689
__attribute__((nonnull, warn_unused_result))
1690
error_t bring_up_interface(const char *const interface,
1691
const float delay){
1692
error_t old_errno = errno;
1693
int ret;
1694
struct ifreq network;
1695
unsigned int if_index = if_nametoindex(interface);
1696
if(if_index == 0){
1697
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1698
errno = old_errno;
1699
return ENXIO;
1700
}
1701
1702
if(quit_now){
1703
errno = old_errno;
1704
return EINTR;
1705
}
1706
1707
if(not interface_is_up(interface)){
1708
error_t ret_errno = 0, ioctl_errno = 0;
1709
if(not get_flags(interface, &network)){
1710
ret_errno = errno;
1711
fprintf_plus(stderr, "Failed to get flags for interface "
1712
"\"%s\"\n", interface);
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
network.ifr_flags |= IFF_UP; /* set flag */
1717
1718
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1719
if(sd == -1){
1720
ret_errno = errno;
1721
perror_plus("socket");
1722
errno = old_errno;
1723
return ret_errno;
1724
}
1725
1726
if(quit_now){
822
int main(int argc, char *argv[]){
823
AvahiSServiceBrowser *sb = NULL;
824
int error;
825
int ret;
826
intmax_t tmpmax;
827
int numchars;
828
int exitcode = EXIT_SUCCESS;
829
const char *interface = "eth0";
830
struct ifreq network;
831
int sd;
832
uid_t uid;
833
gid_t gid;
834
char *connect_to = NULL;
835
char tempdir[] = "/tmp/mandosXXXXXX";
836
bool tempdir_created = false;
837
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
838
const char *seckey = PATHDIR "/" SECKEY;
839
const char *pubkey = PATHDIR "/" PUBKEY;
840
841
mandos_context mc = { .simple_poll = NULL, .server = NULL,
842
.dh_bits = 1024, .priority = "SECURE256"
843
":!CTYPE-X.509:+CTYPE-OPENPGP" };
844
bool gnutls_initialized = false;
845
bool gpgme_initialized = false;
846
double delay = 2.5;
847
848
{
849
struct argp_option options[] = {
850
{ .name = "debug", .key = 128,
851
.doc = "Debug mode", .group = 3 },
852
{ .name = "connect", .key = 'c',
853
.arg = "ADDRESS:PORT",
854
.doc = "Connect directly to a specific Mandos server",
855
.group = 1 },
856
{ .name = "interface", .key = 'i',
857
.arg = "NAME",
858
.doc = "Interface that will be used to search for Mandos"
859
" servers",
860
.group = 1 },
861
{ .name = "seckey", .key = 's',
862
.arg = "FILE",
863
.doc = "OpenPGP secret key file base name",
864
.group = 1 },
865
{ .name = "pubkey", .key = 'p',
866
.arg = "FILE",
867
.doc = "OpenPGP public key file base name",
868
.group = 2 },
869
{ .name = "dh-bits", .key = 129,
870
.arg = "BITS",
871
.doc = "Bit length of the prime number used in the"
872
" Diffie-Hellman key exchange",
873
.group = 2 },
874
{ .name = "priority", .key = 130,
875
.arg = "STRING",
876
.doc = "GnuTLS priority string for the TLS handshake",
877
.group = 1 },
878
{ .name = "delay", .key = 131,
879
.arg = "SECONDS",
880
.doc = "Maximum delay to wait for interface startup",
881
.group = 2 },
882
{ .name = NULL }
883
};
884
885
error_t parse_opt(int key, char *arg,
886
struct argp_state *state) {
887
switch(key) {
888
case 128: /* --debug */
889
debug = true;
890
break;
891
case 'c': /* --connect */
892
connect_to = arg;
893
break;
894
case 'i': /* --interface */
895
interface = arg;
896
break;
897
case 's': /* --seckey */
898
seckey = arg;
899
break;
900
case 'p': /* --pubkey */
901
pubkey = arg;
902
break;
903
case 129: /* --dh-bits */
904
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
905
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
906
or arg[numchars] != '\0'){
907
fprintf(stderr, "Bad number of DH bits\n");
908
exit(EXIT_FAILURE);
909
}
910
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
911
break;
912
case 130: /* --priority */
913
mc.priority = arg;
914
break;
915
case 131: /* --delay */
916
ret = sscanf(arg, "%lf%n", &delay, &numchars);
917
if(ret < 1 or arg[numchars] != '\0'){
918
fprintf(stderr, "Bad delay\n");
919
exit(EXIT_FAILURE);
920
}
921
break;
922
case ARGP_KEY_ARG:
923
argp_usage(state);
924
case ARGP_KEY_END:
925
break;
926
default:
927
return ARGP_ERR_UNKNOWN;
928
}
929
return 0;
930
}
931
932
struct argp argp = { .options = options, .parser = parse_opt,
933
.args_doc = "",
934
.doc = "Mandos client -- Get and decrypt"
935
" passwords from a Mandos server" };
936
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
937
if(ret == ARGP_ERR_UNKNOWN){
938
fprintf(stderr, "Unknown error while parsing arguments\n");
939
exitcode = EXIT_FAILURE;
940
goto end;
941
}
942
}
943
944
/* If the interface is down, bring it up */
945
{
946
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
947
messages to mess up the prompt */
948
ret = klogctl(8, NULL, 5);
949
if(ret == -1){
950
perror("klogctl");
951
}
952
953
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
954
if(sd < 0) {
955
perror("socket");
956
exitcode = EXIT_FAILURE;
957
ret = klogctl(7, NULL, 0);
958
if(ret == -1){
959
perror("klogctl");
960
}
961
goto end;
962
}
963
strcpy(network.ifr_name, interface);
964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
965
if(ret == -1){
966
perror("ioctl SIOCGIFFLAGS");
967
ret = klogctl(7, NULL, 0);
968
if(ret == -1){
969
perror("klogctl");
970
}
971
exitcode = EXIT_FAILURE;
972
goto end;
973
}
974
if((network.ifr_flags & IFF_UP) == 0){
975
network.ifr_flags |= IFF_UP;
976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
977
if(ret == -1){
978
perror("ioctl SIOCSIFFLAGS");
979
exitcode = EXIT_FAILURE;
980
ret = klogctl(7, NULL, 0);
981
if(ret == -1){
982
perror("klogctl");
983
}
984
goto end;
985
}
986
}
987
/* sleep checking until interface is running */
988
for(int i=0; i < delay * 4; i++){
989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
990
if(ret == -1){
991
perror("ioctl SIOCGIFFLAGS");
992
} else if(network.ifr_flags & IFF_RUNNING){
993
break;
994
}
995
struct timespec sleeptime = { .tv_nsec = 250000000 };
996
nanosleep(&sleeptime, NULL);
997
}
1727
998
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1728
999
if(ret == -1){
1729
perror_plus("close");
1730
}
1731
errno = old_errno;
1732
return EINTR;
1733
}
1734
1735
if(debug){
1736
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1737
interface);
1738
}
1739
1740
/* Raise privileges */
1741
ret_errno = raise_privileges();
1742
if(ret_errno != 0){
1743
errno = ret_errno;
1744
perror_plus("Failed to raise privileges");
1745
}
1746
1747
#ifdef __linux__
1748
int ret_linux;
1749
bool restore_loglevel = false;
1750
if(ret_errno == 0){
1751
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1752
messages about the network interface to mess up the prompt */
1753
ret_linux = klogctl(8, NULL, 5);
1754
if(ret_linux == -1){
1755
perror_plus("klogctl");
1000
perror("close");
1001
}
1002
/* Restores kernel loglevel to default */
1003
ret = klogctl(7, NULL, 0);
1004
if(ret == -1){
1005
perror("klogctl");
1006
}
1007
}
1008
1009
uid = getuid();
1010
gid = getgid();
1011
1012
setgid(gid);
1013
if(ret == -1){
1014
perror("setgid");
1015
}
1016
1017
ret = setuid(uid);
1018
if(ret == -1){
1019
perror("setuid");
1020
}
1021
1022
ret = init_gnutls_global(&mc, pubkey, seckey);
1023
if(ret == -1){
1024
fprintf(stderr, "init_gnutls_global failed\n");
1025
exitcode = EXIT_FAILURE;
1026
goto end;
1027
} else {
1028
gnutls_initialized = true;
1029
}
1030
1031
if(mkdtemp(tempdir) == NULL){
1032
perror("mkdtemp");
1033
goto end;
1034
}
1035
tempdir_created = true;
1036
1037
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1038
fprintf(stderr, "init_gpgme failed\n");
1039
exitcode = EXIT_FAILURE;
1040
goto end;
1041
} else {
1042
gpgme_initialized = true;
1043
}
1044
1045
if_index = (AvahiIfIndex) if_nametoindex(interface);
1046
if(if_index == 0){
1047
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1048
exitcode = EXIT_FAILURE;
1049
goto end;
1050
}
1051
1052
if(connect_to != NULL){
1053
/* Connect directly, do not use Zeroconf */
1054
/* (Mainly meant for debugging) */
1055
char *address = strrchr(connect_to, ':');
1056
if(address == NULL){
1057
fprintf(stderr, "No colon in address\n");
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
uint16_t port;
1062
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1063
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1064
or address[numchars+1] != '\0'){
1065
fprintf(stderr, "Bad port number\n");
1066
exitcode = EXIT_FAILURE;
1067
goto end;
1068
}
1069
port = (uint16_t)tmpmax;
1070
*address = '\0';
1071
address = connect_to;
1072
ret = start_mandos_communication(address, port, if_index, &mc);
1073
if(ret < 0){
1074
exitcode = EXIT_FAILURE;
1756
1075
} else {
1757
restore_loglevel = true;
1758
}
1759
}
1760
#endif /* __linux__ */
1761
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1762
ioctl_errno = errno;
1763
#ifdef __linux__
1764
if(restore_loglevel){
1765
ret_linux = klogctl(7, NULL, 0);
1766
if(ret_linux == -1){
1767
perror_plus("klogctl");
1768
}
1769
}
1770
#endif /* __linux__ */
1771
1772
/* If raise_privileges() succeeded above */
1773
if(ret_errno == 0){
1774
/* Lower privileges */
1775
ret_errno = lower_privileges();
1776
if(ret_errno != 0){
1777
errno = ret_errno;
1778
perror_plus("Failed to lower privileges");
1779
}
1780
}
1781
1782
/* Close the socket */
1783
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1784
if(ret == -1){
1785
perror_plus("close");
1786
}
1787
1788
if(ret_setflags == -1){
1789
errno = ioctl_errno;
1790
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1791
errno = old_errno;
1792
return ioctl_errno;
1793
}
1794
} else if(debug){
1795
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1796
interface);
1797
}
1798
1799
/* Sleep checking until interface is running.
1800
Check every 0.25s, up to total time of delay */
1801
for(int i=0; i < delay * 4; i++){
1802
if(interface_is_running(interface)){
1803
break;
1804
}
1805
struct timespec sleeptime = { .tv_nsec = 250000000 };
1806
ret = nanosleep(&sleeptime, NULL);
1807
if(ret == -1 and errno != EINTR){
1808
perror_plus("nanosleep");
1809
}
1810
}
1811
1812
errno = old_errno;
1813
return 0;
1814
}
1815
1816
__attribute__((nonnull, warn_unused_result))
1817
error_t take_down_interface(const char *const interface){
1818
error_t old_errno = errno;
1819
struct ifreq network;
1820
unsigned int if_index = if_nametoindex(interface);
1821
if(if_index == 0){
1822
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1823
errno = old_errno;
1824
return ENXIO;
1825
}
1826
if(interface_is_up(interface)){
1827
error_t ret_errno = 0, ioctl_errno = 0;
1828
if(not get_flags(interface, &network) and debug){
1829
ret_errno = errno;
1830
fprintf_plus(stderr, "Failed to get flags for interface "
1831
"\"%s\"\n", interface);
1832
errno = old_errno;
1833
return ret_errno;
1834
}
1835
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1836
1837
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1838
if(sd == -1){
1839
ret_errno = errno;
1840
perror_plus("socket");
1841
errno = old_errno;
1842
return ret_errno;
1843
}
1844
1845
if(debug){
1846
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1847
interface);
1848
}
1849
1850
/* Raise privileges */
1851
ret_errno = raise_privileges();
1852
if(ret_errno != 0){
1853
errno = ret_errno;
1854
perror_plus("Failed to raise privileges");
1855
}
1856
1857
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1858
ioctl_errno = errno;
1859
1860
/* If raise_privileges() succeeded above */
1861
if(ret_errno == 0){
1862
/* Lower privileges */
1863
ret_errno = lower_privileges();
1864
if(ret_errno != 0){
1865
errno = ret_errno;
1866
perror_plus("Failed to lower privileges");
1867
}
1868
}
1869
1870
/* Close the socket */
1871
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1872
if(ret == -1){
1873
perror_plus("close");
1874
}
1875
1876
if(ret_setflags == -1){
1877
errno = ioctl_errno;
1878
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1879
errno = old_errno;
1880
return ioctl_errno;
1881
}
1882
} else if(debug){
1883
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1884
interface);
1885
}
1886
1887
errno = old_errno;
1888
return 0;
1889
}
1890
1891
int main(int argc, char *argv[]){
1892
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1893
.priority = "SECURE256:!CTYPE-X.509:"
1894
"+CTYPE-OPENPGP", .current_server = NULL,
1895
.interfaces = NULL, .interfaces_size = 0 };
1896
AvahiSServiceBrowser *sb = NULL;
1897
error_t ret_errno;
1898
int ret;
1899
intmax_t tmpmax;
1900
char *tmp;
1901
int exitcode = EXIT_SUCCESS;
1902
char *interfaces_to_take_down = NULL;
1903
size_t interfaces_to_take_down_size = 0;
1904
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1905
char old_tempdir[] = "/tmp/mandosXXXXXX";
1906
char *tempdir = NULL;
1907
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1908
const char *seckey = PATHDIR "/" SECKEY;
1909
const char *pubkey = PATHDIR "/" PUBKEY;
1910
char *interfaces_hooks = NULL;
1911
1912
bool gnutls_initialized = false;
1913
bool gpgme_initialized = false;
1914
float delay = 2.5f;
1915
double retry_interval = 10; /* 10s between trying a server and
1916
retrying the same server again */
1917
1918
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1920
1921
uid = getuid();
1922
gid = getgid();
1923
1924
/* Lower any group privileges we might have, just to be safe */
1925
errno = 0;
1926
ret = setgid(gid);
1927
if(ret == -1){
1928
perror_plus("setgid");
1929
}
1930
1931
/* Lower user privileges (temporarily) */
1932
errno = 0;
1933
ret = seteuid(uid);
1934
if(ret == -1){
1935
perror_plus("seteuid");
1936
}
1937
1938
if(quit_now){
1939
goto end;
1940
}
1941
1942
{
1943
struct argp_option options[] = {
1944
{ .name = "debug", .key = 128,
1945
.doc = "Debug mode", .group = 3 },
1946
{ .name = "connect", .key = 'c',
1947
.arg = "ADDRESS:PORT",
1948
.doc = "Connect directly to a specific Mandos server",
1949
.group = 1 },
1950
{ .name = "interface", .key = 'i',
1951
.arg = "NAME",
1952
.doc = "Network interface that will be used to search for"
1953
" Mandos servers",
1954
.group = 1 },
1955
{ .name = "seckey", .key = 's',
1956
.arg = "FILE",
1957
.doc = "OpenPGP secret key file base name",
1958
.group = 1 },
1959
{ .name = "pubkey", .key = 'p',
1960
.arg = "FILE",
1961
.doc = "OpenPGP public key file base name",
1962
.group = 2 },
1963
{ .name = "dh-bits", .key = 129,
1964
.arg = "BITS",
1965
.doc = "Bit length of the prime number used in the"
1966
" Diffie-Hellman key exchange",
1967
.group = 2 },
1968
{ .name = "priority", .key = 130,
1969
.arg = "STRING",
1970
.doc = "GnuTLS priority string for the TLS handshake",
1971
.group = 1 },
1972
{ .name = "delay", .key = 131,
1973
.arg = "SECONDS",
1974
.doc = "Maximum delay to wait for interface startup",
1975
.group = 2 },
1976
{ .name = "retry", .key = 132,
1977
.arg = "SECONDS",
1978
.doc = "Retry interval used when denied by the Mandos server",
1979
.group = 2 },
1980
{ .name = "network-hook-dir", .key = 133,
1981
.arg = "DIR",
1982
.doc = "Directory where network hooks are located",
1983
.group = 2 },
1984
/*
1985
* These reproduce what we would get without ARGP_NO_HELP
1986
*/
1987
{ .name = "help", .key = '?',
1988
.doc = "Give this help list", .group = -1 },
1989
{ .name = "usage", .key = -3,
1990
.doc = "Give a short usage message", .group = -1 },
1991
{ .name = "version", .key = 'V',
1992
.doc = "Print program version", .group = -1 },
1993
{ .name = NULL }
1994
};
1995
1996
error_t parse_opt(int key, char *arg,
1997
struct argp_state *state){
1998
errno = 0;
1999
switch(key){
2000
case 128: /* --debug */
2001
debug = true;
2002
break;
2003
case 'c': /* --connect */
2004
connect_to = arg;
2005
break;
2006
case 'i': /* --interface */
2007
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2008
arg, (int)',');
2009
if(ret_errno != 0){
2010
argp_error(state, "%s", strerror(ret_errno));
2011
}
2012
break;
2013
case 's': /* --seckey */
2014
seckey = arg;
2015
break;
2016
case 'p': /* --pubkey */
2017
pubkey = arg;
2018
break;
2019
case 129: /* --dh-bits */
2020
errno = 0;
2021
tmpmax = strtoimax(arg, &tmp, 10);
2022
if(errno != 0 or tmp == arg or *tmp != '\0'
2023
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2024
argp_error(state, "Bad number of DH bits");
2025
}
2026
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2027
break;
2028
case 130: /* --priority */
2029
mc.priority = arg;
2030
break;
2031
case 131: /* --delay */
2032
errno = 0;
2033
delay = strtof(arg, &tmp);
2034
if(errno != 0 or tmp == arg or *tmp != '\0'){
2035
argp_error(state, "Bad delay");
2036
}
2037
case 132: /* --retry */
2038
errno = 0;
2039
retry_interval = strtod(arg, &tmp);
2040
if(errno != 0 or tmp == arg or *tmp != '\0'
2041
or (retry_interval * 1000) > INT_MAX
2042
or retry_interval < 0){
2043
argp_error(state, "Bad retry interval");
2044
}
2045
break;
2046
case 133: /* --network-hook-dir */
2047
hookdir = arg;
2048
break;
2049
/*
2050
* These reproduce what we would get without ARGP_NO_HELP
2051
*/
2052
case '?': /* --help */
2053
argp_state_help(state, state->out_stream,
2054
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2055
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2056
case -3: /* --usage */
2057
argp_state_help(state, state->out_stream,
2058
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2059
case 'V': /* --version */
2060
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2061
exit(argp_err_exit_status);
2062
break;
2063
default:
2064
return ARGP_ERR_UNKNOWN;
2065
}
2066
return errno;
2067
}
2068
2069
struct argp argp = { .options = options, .parser = parse_opt,
2070
.args_doc = "",
2071
.doc = "Mandos client -- Get and decrypt"
2072
" passwords from a Mandos server" };
2073
ret = argp_parse(&argp, argc, argv,
2074
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2075
switch(ret){
2076
case 0:
2077
break;
2078
case ENOMEM:
2079
default:
2080
errno = ret;
2081
perror_plus("argp_parse");
2082
exitcode = EX_OSERR;
2083
goto end;
2084
case EINVAL:
2085
exitcode = EX_USAGE;
2086
goto end;
2087
}
2088
}
2089
2090
{
2091
/* Work around Debian bug #633582:
2092
<http://bugs.debian.org/633582> */
2093
2094
/* Re-raise privileges */
2095
ret_errno = raise_privileges();
2096
if(ret_errno != 0){
2097
errno = ret_errno;
2098
perror_plus("Failed to raise privileges");
2099
} else {
2100
struct stat st;
2101
2102
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2103
int seckey_fd = open(seckey, O_RDONLY);
2104
if(seckey_fd == -1){
2105
perror_plus("open");
2106
} else {
2107
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2108
if(ret == -1){
2109
perror_plus("fstat");
2110
} else {
2111
if(S_ISREG(st.st_mode)
2112
and st.st_uid == 0 and st.st_gid == 0){
2113
ret = fchown(seckey_fd, uid, gid);
2114
if(ret == -1){
2115
perror_plus("fchown");
2116
}
2117
}
2118
}
2119
TEMP_FAILURE_RETRY(close(seckey_fd));
2120
}
2121
}
2122
2123
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2124
int pubkey_fd = open(pubkey, O_RDONLY);
2125
if(pubkey_fd == -1){
2126
perror_plus("open");
2127
} else {
2128
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2129
if(ret == -1){
2130
perror_plus("fstat");
2131
} else {
2132
if(S_ISREG(st.st_mode)
2133
and st.st_uid == 0 and st.st_gid == 0){
2134
ret = fchown(pubkey_fd, uid, gid);
2135
if(ret == -1){
2136
perror_plus("fchown");
2137
}
2138
}
2139
}
2140
TEMP_FAILURE_RETRY(close(pubkey_fd));
2141
}
2142
}
2143
2144
/* Lower privileges */
2145
ret_errno = lower_privileges();
2146
if(ret_errno != 0){
2147
errno = ret_errno;
2148
perror_plus("Failed to lower privileges");
2149
}
2150
}
2151
}
2152
2153
/* Remove invalid interface names (except "none") */
2154
{
2155
char *interface = NULL;
2156
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2157
interface))){
2158
if(strcmp(interface, "none") != 0
2159
and if_nametoindex(interface) == 0){
2160
if(interface[0] != '\0'){
2161
fprintf_plus(stderr, "Not using nonexisting interface"
2162
" \"%s\"\n", interface);
2163
}
2164
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2165
interface = NULL;
2166
}
2167
}
2168
}
2169
2170
/* Run network hooks */
2171
{
2172
if(mc.interfaces != NULL){
2173
interfaces_hooks = malloc(mc.interfaces_size);
2174
if(interfaces_hooks == NULL){
2175
perror_plus("malloc");
2176
goto end;
2177
}
2178
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2179
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2180
}
2181
run_network_hooks("start", interfaces_hooks != NULL ?
2182
interfaces_hooks : "", delay);
2183
}
2184
2185
if(not debug){
2186
avahi_set_log_function(empty_log);
2187
}
2188
2189
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2190
from the signal handler */
2191
/* Initialize the pseudo-RNG for Avahi */
2192
srand((unsigned int) time(NULL));
2193
simple_poll = avahi_simple_poll_new();
2194
if(simple_poll == NULL){
2195
fprintf_plus(stderr,
2196
"Avahi: Failed to create simple poll object.\n");
2197
exitcode = EX_UNAVAILABLE;
2198
goto end;
2199
}
2200
2201
sigemptyset(&sigterm_action.sa_mask);
2202
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2203
if(ret == -1){
2204
perror_plus("sigaddset");
2205
exitcode = EX_OSERR;
2206
goto end;
2207
}
2208
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2209
if(ret == -1){
2210
perror_plus("sigaddset");
2211
exitcode = EX_OSERR;
2212
goto end;
2213
}
2214
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2215
if(ret == -1){
2216
perror_plus("sigaddset");
2217
exitcode = EX_OSERR;
2218
goto end;
2219
}
2220
/* Need to check if the handler is SIG_IGN before handling:
2221
| [[info:libc:Initial Signal Actions]] |
2222
| [[info:libc:Basic Signal Handling]] |
2223
*/
2224
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2225
if(ret == -1){
2226
perror_plus("sigaction");
2227
return EX_OSERR;
2228
}
2229
if(old_sigterm_action.sa_handler != SIG_IGN){
2230
ret = sigaction(SIGINT, &sigterm_action, NULL);
2231
if(ret == -1){
2232
perror_plus("sigaction");
2233
exitcode = EX_OSERR;
2234
goto end;
2235
}
2236
}
2237
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2238
if(ret == -1){
2239
perror_plus("sigaction");
2240
return EX_OSERR;
2241
}
2242
if(old_sigterm_action.sa_handler != SIG_IGN){
2243
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2244
if(ret == -1){
2245
perror_plus("sigaction");
2246
exitcode = EX_OSERR;
2247
goto end;
2248
}
2249
}
2250
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2251
if(ret == -1){
2252
perror_plus("sigaction");
2253
return EX_OSERR;
2254
}
2255
if(old_sigterm_action.sa_handler != SIG_IGN){
2256
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2257
if(ret == -1){
2258
perror_plus("sigaction");
2259
exitcode = EX_OSERR;
2260
goto end;
2261
}
2262
}
2263
2264
/* If no interfaces were specified, make a list */
2265
if(mc.interfaces == NULL){
2266
struct dirent **direntries = NULL;
2267
/* Look for any good interfaces */
2268
ret = scandir(sys_class_net, &direntries, good_interface,
2269
alphasort);
2270
if(ret >= 1){
2271
/* Add all found interfaces to interfaces list */
2272
for(int i = 0; i < ret; ++i){
2273
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2274
direntries[i]->d_name);
2275
if(ret_errno != 0){
2276
errno = ret_errno;
2277
perror_plus("argz_add");
2278
continue;
2279
}
2280
if(debug){
2281
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2282
direntries[i]->d_name);
2283
}
2284
}
2285
free(direntries);
2286
} else {
2287
if(ret == 0){
2288
free(direntries);
2289
}
2290
fprintf_plus(stderr, "Could not find a network interface\n");
2291
exitcode = EXIT_FAILURE;
2292
goto end;
2293
}
2294
}
2295
2296
/* Bring up interfaces which are down, and remove any "none"s */
2297
{
2298
char *interface = NULL;
2299
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2300
interface))){
2301
/* If interface name is "none", stop bringing up interfaces.
2302
Also remove all instances of "none" from the list */
2303
if(strcmp(interface, "none") == 0){
2304
argz_delete(&mc.interfaces, &mc.interfaces_size,
2305
interface);
2306
interface = NULL;
2307
while((interface = argz_next(mc.interfaces,
2308
mc.interfaces_size, interface))){
2309
if(strcmp(interface, "none") == 0){
2310
argz_delete(&mc.interfaces, &mc.interfaces_size,
2311
interface);
2312
interface = NULL;
2313
}
2314
}
2315
break;
2316
}
2317
bool interface_was_up = interface_is_up(interface);
2318
errno = bring_up_interface(interface, delay);
2319
if(not interface_was_up){
2320
if(errno != 0){
2321
perror_plus("Failed to bring up interface");
2322
} else {
2323
errno = argz_add(&interfaces_to_take_down,
2324
&interfaces_to_take_down_size,
2325
interface);
2326
if(errno != 0){
2327
perror_plus("argz_add");
2328
}
2329
}
2330
}
2331
}
2332
if(debug and (interfaces_to_take_down == NULL)){
2333
fprintf_plus(stderr, "No interfaces were brought up\n");
2334
}
2335
}
2336
2337
/* If we only got one interface, explicitly use only that one */
2338
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2339
if(debug){
2340
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2341
mc.interfaces);
2342
}
2343
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2344
}
2345
2346
if(quit_now){
2347
goto end;
2348
}
2349
2350
ret = init_gnutls_global(pubkey, seckey, &mc);
2351
if(ret == -1){
2352
fprintf_plus(stderr, "init_gnutls_global failed\n");
2353
exitcode = EX_UNAVAILABLE;
2354
goto end;
2355
} else {
2356
gnutls_initialized = true;
2357
}
2358
2359
if(quit_now){
2360
goto end;
2361
}
2362
2363
/* Try /run/tmp before /tmp */
2364
tempdir = mkdtemp(run_tempdir);
2365
if(tempdir == NULL and errno == ENOENT){
2366
if(debug){
2367
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2368
run_tempdir, old_tempdir);
2369
}
2370
tempdir = mkdtemp(old_tempdir);
2371
}
2372
if(tempdir == NULL){
2373
perror_plus("mkdtemp");
2374
goto end;
2375
}
2376
2377
if(quit_now){
2378
goto end;
2379
}
2380
2381
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2382
fprintf_plus(stderr, "init_gpgme failed\n");
2383
exitcode = EX_UNAVAILABLE;
2384
goto end;
2385
} else {
2386
gpgme_initialized = true;
2387
}
2388
2389
if(quit_now){
2390
goto end;
2391
}
2392
2393
if(connect_to != NULL){
2394
/* Connect directly, do not use Zeroconf */
2395
/* (Mainly meant for debugging) */
2396
char *address = strrchr(connect_to, ':');
2397
2398
if(address == NULL){
2399
fprintf_plus(stderr, "No colon in address\n");
2400
exitcode = EX_USAGE;
2401
goto end;
2402
}
2403
2404
if(quit_now){
2405
goto end;
2406
}
2407
2408
in_port_t port;
2409
errno = 0;
2410
tmpmax = strtoimax(address+1, &tmp, 10);
2411
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2412
or tmpmax != (in_port_t)tmpmax){
2413
fprintf_plus(stderr, "Bad port number\n");
2414
exitcode = EX_USAGE;
2415
goto end;
2416
}
2417
2418
if(quit_now){
2419
goto end;
2420
}
2421
2422
port = (in_port_t)tmpmax;
2423
*address = '\0';
2424
/* Colon in address indicates IPv6 */
2425
int af;
2426
if(strchr(connect_to, ':') != NULL){
2427
af = AF_INET6;
2428
/* Accept [] around IPv6 address - see RFC 5952 */
2429
if(connect_to[0] == '[' and address[-1] == ']')
2430
{
2431
connect_to++;
2432
address[-1] = '\0';
2433
}
2434
} else {
2435
af = AF_INET;
2436
}
2437
address = connect_to;
2438
2439
if(quit_now){
2440
goto end;
2441
}
2442
2443
while(not quit_now){
2444
ret = start_mandos_communication(address, port, if_index, af,
2445
&mc);
2446
if(quit_now or ret == 0){
2447
break;
2448
}
2449
if(debug){
2450
fprintf_plus(stderr, "Retrying in %d seconds\n",
2451
(int)retry_interval);
2452
}
2453
sleep((unsigned int)retry_interval);
2454
}
2455
2456
if(not quit_now){
2457
exitcode = EXIT_SUCCESS;
2458
}
2459
2460
goto end;
2461
}
2462
2463
if(quit_now){
2464
goto end;
2465
}
2466
2467
{
2468
AvahiServerConfig config;
2469
/* Do not publish any local Zeroconf records */
2470
avahi_server_config_init(&config);
2471
config.publish_hinfo = 0;
2472
config.publish_addresses = 0;
2473
config.publish_workstation = 0;
2474
config.publish_domain = 0;
2475
2476
/* Allocate a new server */
2477
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2478
&config, NULL, NULL, &ret_errno);
2479
2480
/* Free the Avahi configuration data */
2481
avahi_server_config_free(&config);
2482
}
2483
2484
/* Check if creating the Avahi server object succeeded */
2485
if(mc.server == NULL){
2486
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2487
avahi_strerror(ret_errno));
2488
exitcode = EX_UNAVAILABLE;
2489
goto end;
2490
}
2491
2492
if(quit_now){
2493
goto end;
2494
}
2495
2496
/* Create the Avahi service browser */
2497
sb = avahi_s_service_browser_new(mc.server, if_index,
2498
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2499
NULL, 0, browse_callback,
2500
(void *)&mc);
2501
if(sb == NULL){
2502
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2503
avahi_strerror(avahi_server_errno(mc.server)));
2504
exitcode = EX_UNAVAILABLE;
2505
goto end;
2506
}
2507
2508
if(quit_now){
2509
goto end;
2510
}
2511
2512
/* Run the main loop */
2513
2514
if(debug){
2515
fprintf_plus(stderr, "Starting Avahi loop search\n");
2516
}
2517
2518
ret = avahi_loop_with_timeout(simple_poll,
2519
(int)(retry_interval * 1000), &mc);
2520
if(debug){
2521
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2522
(ret == 0) ? "successfully" : "with error");
2523
}
2524
1076
exitcode = EXIT_SUCCESS;
1077
}
1078
goto end;
1079
}
1080
1081
if(not debug){
1082
avahi_set_log_function(empty_log);
1083
}
1084
1085
/* Initialize the pseudo-RNG for Avahi */
1086
srand((unsigned int) time(NULL));
1087
1088
/* Allocate main Avahi loop object */
1089
mc.simple_poll = avahi_simple_poll_new();
1090
if(mc.simple_poll == NULL) {
1091
fprintf(stderr, "Avahi: Failed to create simple poll"
1092
" object.\n");
1093
exitcode = EXIT_FAILURE;
1094
goto end;
1095
}
1096
1097
{
1098
AvahiServerConfig config;
1099
/* Do not publish any local Zeroconf records */
1100
avahi_server_config_init(&config);
1101
config.publish_hinfo = 0;
1102
config.publish_addresses = 0;
1103
config.publish_workstation = 0;
1104
config.publish_domain = 0;
1105
1106
/* Allocate a new server */
1107
mc.server = avahi_server_new(avahi_simple_poll_get
1108
(mc.simple_poll), &config, NULL,
1109
NULL, &error);
1110
1111
/* Free the Avahi configuration data */
1112
avahi_server_config_free(&config);
1113
}
1114
1115
/* Check if creating the Avahi server object succeeded */
1116
if(mc.server == NULL) {
1117
fprintf(stderr, "Failed to create Avahi server: %s\n",
1118
avahi_strerror(error));
1119
exitcode = EXIT_FAILURE;
1120
goto end;
1121
}
1122
1123
/* Create the Avahi service browser */
1124
sb = avahi_s_service_browser_new(mc.server, if_index,
1125
AVAHI_PROTO_INET6,
1126
"_mandos._tcp", NULL, 0,
1127
browse_callback, &mc);
1128
if(sb == NULL) {
1129
fprintf(stderr, "Failed to create service browser: %s\n",
1130
avahi_strerror(avahi_server_errno(mc.server)));
1131
exitcode = EXIT_FAILURE;
1132
goto end;
1133
}
1134
1135
/* Run the main loop */
1136
1137
if(debug){
1138
fprintf(stderr, "Starting Avahi loop search\n");
1139
}
1140
1141
avahi_simple_poll_loop(mc.simple_poll);
1142
2525
1143
end:
2526
2527
if(debug){
2528
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2529
}
2530
2531
/* Cleanup things */
2532
free(mc.interfaces);
2533
2534
if(sb != NULL)
2535
avahi_s_service_browser_free(sb);
2536
2537
if(mc.server != NULL)
2538
avahi_server_free(mc.server);
2539
2540
if(simple_poll != NULL)
2541
avahi_simple_poll_free(simple_poll);
2542
2543
if(gnutls_initialized){
2544
gnutls_certificate_free_credentials(mc.cred);
2545
gnutls_global_deinit();
2546
gnutls_dh_params_deinit(mc.dh_params);
2547
}
2548
2549
if(gpgme_initialized){
2550
gpgme_release(mc.ctx);
2551
}
2552
2553
/* Cleans up the circular linked list of Mandos servers the client
2554
has seen */
2555
if(mc.current_server != NULL){
2556
mc.current_server->prev->next = NULL;
2557
while(mc.current_server != NULL){
2558
server *next = mc.current_server->next;
2559
#ifdef __GNUC__
2560
#pragma GCC diagnostic push
2561
#pragma GCC diagnostic ignored "-Wcast-qual"
2562
#endif
2563
free((char *)(mc.current_server->ip));
2564
#ifdef __GNUC__
2565
#pragma GCC diagnostic pop
2566
#endif
2567
free(mc.current_server);
2568
mc.current_server = next;
2569
}
2570
}
2571
2572
/* Re-raise privileges */
2573
{
2574
ret_errno = raise_privileges();
2575
if(ret_errno != 0){
2576
errno = ret_errno;
2577
perror_plus("Failed to raise privileges");
2578
} else {
2579
2580
/* Run network hooks */
2581
run_network_hooks("stop", interfaces_hooks != NULL ?
2582
interfaces_hooks : "", delay);
2583
2584
/* Take down the network interfaces which were brought up */
2585
{
2586
char *interface = NULL;
2587
while((interface=argz_next(interfaces_to_take_down,
2588
interfaces_to_take_down_size,
2589
interface))){
2590
ret_errno = take_down_interface(interface);
2591
if(ret_errno != 0){
2592
errno = ret_errno;
2593
perror_plus("Failed to take down interface");
2594
}
2595
}
2596
if(debug and (interfaces_to_take_down == NULL)){
2597
fprintf_plus(stderr, "No interfaces needed to be taken"
2598
" down\n");
2599
}
2600
}
2601
}
2602
2603
ret_errno = lower_privileges_permanently();
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to lower privileges permanently");
2607
}
2608
}
2609
2610
free(interfaces_to_take_down);
2611
free(interfaces_hooks);
2612
2613
/* Removes the GPGME temp directory and all files inside */
2614
if(tempdir != NULL){
2615
struct dirent **direntries = NULL;
2616
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2617
O_NOFOLLOW));
2618
if(tempdir_fd == -1){
2619
perror_plus("open");
2620
} else {
2621
#ifdef __GLIBC__
2622
#if __GLIBC_PREREQ(2, 15)
2623
int numentries = scandirat(tempdir_fd, ".", &direntries,
2624
notdotentries, alphasort);
2625
#else /* not __GLIBC_PREREQ(2, 15) */
2626
int numentries = scandir(tempdir, &direntries, notdotentries,
2627
alphasort);
2628
#endif /* not __GLIBC_PREREQ(2, 15) */
2629
#else /* not __GLIBC__ */
2630
int numentries = scandir(tempdir, &direntries, notdotentries,
2631
alphasort);
2632
#endif /* not __GLIBC__ */
2633
if(numentries >= 0){
2634
for(int i = 0; i < numentries; i++){
2635
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
1144
1145
if(debug){
1146
fprintf(stderr, "%s exiting\n", argv[0]);
1147
}
1148
1149
/* Cleanup things */
1150
if(sb != NULL)
1151
avahi_s_service_browser_free(sb);
1152
1153
if(mc.server != NULL)
1154
avahi_server_free(mc.server);
1155
1156
if(mc.simple_poll != NULL)
1157
avahi_simple_poll_free(mc.simple_poll);
1158
1159
if(gnutls_initialized){
1160
gnutls_certificate_free_credentials(mc.cred);
1161
gnutls_global_deinit();
1162
gnutls_dh_params_deinit(mc.dh_params);
1163
}
1164
1165
if(gpgme_initialized){
1166
gpgme_release(mc.ctx);
1167
}
1168
1169
/* Removes the temp directory used by GPGME */
1170
if(tempdir_created){
1171
DIR *d;
1172
struct dirent *direntry;
1173
d = opendir(tempdir);
1174
if(d == NULL){
1175
if(errno != ENOENT){
1176
perror("opendir");
1177
}
1178
} else {
1179
while(true){
1180
direntry = readdir(d);
1181
if(direntry == NULL){
1182
break;
1183
}
1184
/* Skip "." and ".." */
1185
if(direntry->d_name[0] == '.'
1186
and (direntry->d_name[1] == '\0'
1187
or (direntry->d_name[1] == '.'
1188
and direntry->d_name[2] == '\0'))){
1189
continue;
1190
}
1191
char *fullname = NULL;
1192
ret = asprintf(&fullname, "%s/%s", tempdir,
1193
direntry->d_name);
1194
if(ret < 0){
1195
perror("asprintf");
1196
continue;
1197
}
1198
ret = remove(fullname);
2636
1199
if(ret == -1){
2637
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2638
" \"%s\", 0): %s\n", tempdir,
2639
direntries[i]->d_name, strerror(errno));
1200
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1201
strerror(errno));
2640
1202
}
2641
}
2642
2643
/* need to clean even if 0 because man page doesn't specify */
2644
free(direntries);
2645
if(numentries == -1){
2646
perror_plus("scandir");
2647
}
2648
ret = rmdir(tempdir);
2649
if(ret == -1 and errno != ENOENT){
2650
perror_plus("rmdir");
2651
}
2652
}
2653
TEMP_FAILURE_RETRY(close(tempdir_fd));
2654
}
2655
}
2656
2657
if(quit_now){
2658
sigemptyset(&old_sigterm_action.sa_mask);
2659
old_sigterm_action.sa_handler = SIG_DFL;
2660
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2661
&old_sigterm_action,
2662
NULL));
2663
if(ret == -1){
2664
perror_plus("sigaction");
2665
}
2666
do {
2667
ret = raise(signal_received);
2668
} while(ret != 0 and errno == EINTR);
2669
if(ret != 0){
2670
perror_plus("raise");
2671
abort();
2672
}
2673
TEMP_FAILURE_RETRY(pause());
2674
}
2675
2676
return exitcode;
1203
free(fullname);
1204
}
1205
closedir(d);
1206
}
1207
ret = rmdir(tempdir);
1208
if(ret == -1 and errno != ENOENT){
1209
perror("rmdir");
1210
}
1211
}
1212
1213
return exitcode;
2677
1214
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0