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- Committer: Teddy Hogeborn
- Date: 2014-06-14 02:55:24 UTC
- Revision ID: teddy@recompile.se-20140614025524-k03150tjp4t89w1d
plugin-runner: Restore resources correctly if fork() fails.
* plugin-runner.c (main): If fork() fails, close pipe FD's and restore
signal mask for SIGCHLD.
* plugin-runner.c (main): If fork() fails, close pipe FD's and restore
signal mask for SIGCHLD.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files removed:
- etc-plugins.d-README
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
43
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
69
SIOCSIFFLAGS, if_indextoname(),
63
70
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
65
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
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
80
#include <argp.h> /* struct argp_option, error_t, struct
71
81
argp_state, struct argp,
72
82
argp_parse(), ARGP_KEY_ARG,
73
83
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
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
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
74
102
75
103
/* Avahi */
76
104
/* All Avahi types, constants and functions
89
117
gnutls_*
90
118
init_gnutls_session(),
91
119
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
94
123
95
124
/* GPGME */
96
125
#include <gpgme.h> /* All GPGME types, constants and
101
130
102
131
#define BUFFER_SIZE 256
103
132
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
133
#define PATHDIR "/conf/conf.d/mandos"
109
134
#define SECKEY "seckey.txt"
110
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
111
137
112
138
bool debug = false;
113
139
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
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;
116
159
117
160
/* Used for passing in values through the Avahi callback functions */
118
161
typedef struct {
119
AvahiSimplePoll *simple_poll;
120
162
AvahiServer *server;
121
163
gnutls_certificate_credentials_t cred;
122
164
unsigned int dh_bits;
123
165
gnutls_dh_params_t dh_params;
124
166
const char *priority;
125
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
126
171
} mandos_context;
127
172
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
128
198
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
131
201
* "buffer_length" is how much is already used.
132
202
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
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
213
return 0;
139
214
}
215
*buffer = new_buf;
140
216
buffer_capacity += BUFFER_SIZE;
141
217
}
142
218
return buffer_capacity;
143
219
}
144
220
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
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
/* Special case of first server */
245
if(*current_server == NULL){
246
new_server->next = new_server;
247
new_server->prev = new_server;
248
*current_server = new_server;
249
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
253
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
return true;
257
}
258
145
259
/*
146
260
* Initialize GPGME.
147
261
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
151
267
gpgme_error_t rc;
152
268
gpgme_engine_info_t engine_info;
153
269
154
155
270
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
271
* Helper function to insert pub and seckey to the engine keyring.
157
272
*/
158
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
274
int ret;
159
275
int fd;
160
276
gpgme_data_t pgp_data;
161
277
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
278
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
279
if(fd == -1){
164
perror("open");
280
perror_plus("open");
165
281
return false;
166
282
}
167
283
168
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
285
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
172
288
return false;
173
289
}
174
290
175
291
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
292
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
179
295
return false;
180
296
}
181
297
182
ret = TEMP_FAILURE_RETRY(close(fd));
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
299
if(ret == -1){
184
perror("close");
300
perror_plus("close");
185
301
}
186
302
gpgme_data_release(pgp_data);
187
303
return true;
188
304
}
189
305
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
306
if(debug){
307
fprintf_plus(stderr, "Initializing GPGME\n");
192
308
}
193
309
194
310
/* Init GPGME */
195
311
gpgme_check_version(NULL);
196
312
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
313
if(rc != GPG_ERR_NO_ERROR){
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
200
316
return false;
201
317
}
202
318
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
319
/* Set GPGME home directory for the OpenPGP engine only */
320
rc = gpgme_get_engine_info(&engine_info);
321
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
208
324
return false;
209
325
}
210
326
while(engine_info != NULL){
216
332
engine_info = engine_info->next;
217
333
}
218
334
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
220
337
return false;
221
338
}
222
339
223
340
/* Create new GPGME "context" */
224
341
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
342
if(rc != GPG_ERR_NO_ERROR){
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
346
return false;
347
}
348
349
if(not import_key(pubkey) or not import_key(seckey)){
350
return false;
351
}
352
353
return true;
236
354
}
237
355
238
356
/*
239
357
* Decrypt OpenPGP data.
240
358
* Returns -1 on error
241
359
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
360
__attribute__((nonnull, warn_unused_result))
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
246
365
gpgme_data_t dh_crypto, dh_plain;
247
366
gpgme_error_t rc;
248
367
ssize_t ret;
249
368
size_t plaintext_capacity = 0;
250
369
ssize_t plaintext_length = 0;
251
370
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
371
if(debug){
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
254
373
}
255
374
256
375
/* Create new GPGME data buffer from memory cryptotext */
257
376
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
377
0);
259
if (rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
262
381
return -1;
263
382
}
264
383
265
384
/* Create new empty GPGME data buffer for the plaintext */
266
385
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
386
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
270
390
gpgme_data_release(dh_crypto);
271
391
return -1;
272
392
}
274
394
/* Decrypt data from the cryptotext data buffer to the plaintext
275
395
data buffer */
276
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
397
if(rc != GPG_ERR_NO_ERROR){
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
280
400
plaintext_length = -1;
281
if (debug){
401
if(debug){
282
402
gpgme_decrypt_result_t result;
283
403
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
404
if(result == NULL){
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
286
406
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
291
411
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
293
413
}
294
414
gpgme_recipient_t recipient;
295
415
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
416
while(recipient != NULL){
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
424
recipient = recipient->next;
306
425
}
307
426
}
308
427
}
310
429
}
311
430
312
431
if(debug){
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
314
433
}
315
434
316
435
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
436
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
437
perror_plus("gpgme_data_seek");
319
438
plaintext_length = -1;
320
439
goto decrypt_end;
321
440
}
322
441
323
442
*plaintext = NULL;
324
443
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
444
plaintext_capacity = incbuffer(plaintext,
445
(size_t)plaintext_length,
446
plaintext_capacity);
447
if(plaintext_capacity == 0){
448
perror_plus("incbuffer");
449
plaintext_length = -1;
450
goto decrypt_end;
332
451
}
333
452
334
453
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
454
BUFFER_SIZE);
336
455
/* Print the data, if any */
337
if (ret == 0){
456
if(ret == 0){
338
457
/* EOF */
339
458
break;
340
459
}
341
460
if(ret < 0){
342
perror("gpgme_data_read");
461
perror_plus("gpgme_data_read");
343
462
plaintext_length = -1;
344
463
goto decrypt_end;
345
464
}
347
466
}
348
467
349
468
if(debug){
350
fprintf(stderr, "Decrypted password is: ");
469
fprintf_plus(stderr, "Decrypted password is: ");
351
470
for(ssize_t i = 0; i < plaintext_length; i++){
352
471
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
353
472
}
364
483
return plaintext_length;
365
484
}
366
485
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
489
if(ret == NULL)
370
490
ret = "(unknown)";
371
491
return ret;
372
492
}
373
493
374
494
/* GnuTLS log function callback */
495
__attribute__((nonnull))
375
496
static void debuggnutls(__attribute__((unused)) int level,
376
497
const char* string){
377
fprintf(stderr, "GnuTLS: %s", string);
498
fprintf_plus(stderr, "GnuTLS: %s", string);
378
499
}
379
500
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
501
__attribute__((nonnull, warn_unused_result))
502
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
383
505
int ret;
384
506
385
507
if(debug){
386
fprintf(stderr, "Initializing GnuTLS\n");
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
387
509
}
388
510
389
511
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
393
515
return -1;
394
516
}
395
517
396
if (debug){
518
if(debug){
397
519
/* "Use a log level over 10 to enable all debugging options."
398
520
* - GnuTLS manual
399
521
*/
402
524
}
403
525
404
526
/* OpenPGP credentials */
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
411
532
return -1;
412
533
}
413
534
414
535
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
418
540
}
419
541
420
542
ret = gnutls_certificate_set_openpgp_key_file
421
543
(mc->cred, pubkeyfilename, seckeyfilename,
422
544
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
424
fprintf(stderr,
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
428
safer_gnutls_strerror(ret));
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr,
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
safer_gnutls_strerror(ret));
429
551
goto globalfail;
430
552
}
431
553
432
554
/* GnuTLS server initialization */
433
555
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
556
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
437
560
goto globalfail;
438
561
}
439
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
563
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
443
566
goto globalfail;
444
567
}
445
568
455
578
return -1;
456
579
}
457
580
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
460
584
int ret;
461
585
/* GnuTLS session creation */
462
ret = gnutls_init(session, GNUTLS_SERVER);
463
if (ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
safer_gnutls_strerror(ret));
586
do {
587
ret = gnutls_init(session, GNUTLS_SERVER);
588
if(quit_now){
589
return -1;
590
}
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
466
596
}
467
597
468
598
{
469
599
const char *err;
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if (ret != GNUTLS_E_SUCCESS) {
472
fprintf(stderr, "Syntax error at: %s\n", err);
473
fprintf(stderr, "GnuTLS error: %s\n",
474
safer_gnutls_strerror(ret));
475
gnutls_deinit (*session);
600
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
if(ret != GNUTLS_E_SUCCESS){
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
611
gnutls_deinit(*session);
476
612
return -1;
477
613
}
478
614
}
479
615
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
if (ret != GNUTLS_E_SUCCESS) {
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
safer_gnutls_strerror(ret));
485
gnutls_deinit (*session);
616
do {
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
619
if(quit_now){
620
gnutls_deinit(*session);
621
return -1;
622
}
623
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
627
gnutls_deinit(*session);
486
628
return -1;
487
629
}
488
630
489
631
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
492
633
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
494
635
495
636
return 0;
496
637
}
500
641
__attribute__((unused)) const char *txt){}
501
642
502
643
/* Called when a Mandos server is found */
503
static int start_mandos_communication(const char *ip, uint16_t port,
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
504
646
AvahiIfIndex if_index,
505
mandos_context *mc){
506
int ret, tcp_sd;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
647
int af, mandos_context *mc){
648
int ret, tcp_sd = -1;
649
ssize_t sret;
650
struct sockaddr_storage to;
508
651
char *buffer = NULL;
509
char *decrypted_buffer;
652
char *decrypted_buffer = NULL;
510
653
size_t buffer_length = 0;
511
654
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
513
655
size_t written;
514
int retval = 0;
515
char interface[IF_NAMESIZE];
656
int retval = -1;
516
657
gnutls_session_t session;
517
518
ret = init_gnutls_session (mc, &session);
519
if (ret != 0){
520
return -1;
521
}
522
523
if(debug){
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
525
"\n", ip, port);
526
}
527
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
530
perror("socket");
531
return -1;
532
}
533
534
if(debug){
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
536
perror("if_indextoname");
658
int pf; /* Protocol family */
659
660
errno = 0;
661
662
if(quit_now){
663
errno = EINTR;
664
return -1;
665
}
666
667
switch(af){
668
case AF_INET6:
669
pf = PF_INET6;
670
break;
671
case AF_INET:
672
pf = PF_INET;
673
break;
674
default:
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
676
errno = EINVAL;
677
return -1;
678
}
679
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
537
708
return -1;
538
709
}
539
fprintf(stderr, "Binding to interface %s\n", interface);
710
}
711
712
ret = init_gnutls_session(&session, mc);
713
if(ret != 0){
714
return -1;
715
}
716
717
if(debug){
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
720
}
721
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
723
if(tcp_sd < 0){
724
int e = errno;
725
perror_plus("socket");
726
errno = e;
727
goto mandos_end;
728
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
540
733
}
541
734
542
735
memset(&to, 0, sizeof(to));
543
to.in6.sin6_family = AF_INET6;
544
/* It would be nice to have a way to detect if we were passed an
545
IPv4 address here. Now we assume an IPv6 address. */
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
547
if (ret < 0 ){
548
perror("inet_pton");
549
return -1;
736
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
739
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
742
}
743
if(ret < 0 ){
744
int e = errno;
745
perror_plus("inet_pton");
746
errno = e;
747
goto mandos_end;
550
748
}
551
749
if(ret == 0){
552
fprintf(stderr, "Bad address: %s\n", ip);
553
return -1;
554
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
750
int e = errno;
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
752
errno = e;
753
goto mandos_end;
754
}
755
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
759
if(if_index == AVAHI_IF_UNSPEC){
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
762
errno = EINVAL;
763
goto mandos_end;
764
}
765
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
767
}
768
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
770
}
556
771
557
to.in6.sin6_scope_id = (uint32_t)if_index;
772
if(quit_now){
773
errno = EINTR;
774
goto mandos_end;
775
}
558
776
559
777
if(debug){
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
port);
562
char addrstr[INET6_ADDRSTRLEN] = "";
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
sizeof(addrstr)) == NULL){
565
perror("inet_ntop");
566
} else {
567
if(strcmp(addrstr, ip) != 0){
568
fprintf(stderr, "Canonical address form: %s\n", addrstr);
778
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
779
char interface[IF_NAMESIZE];
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
perror_plus("if_indextoname");
782
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
569
785
}
570
}
571
}
572
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
575
perror("connect");
576
return -1;
786
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
789
}
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
792
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
797
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
802
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
809
}
810
}
811
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
816
817
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
820
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
823
}
824
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
830
goto mandos_end;
831
}
832
833
if(quit_now){
834
errno = EINTR;
835
goto mandos_end;
577
836
}
578
837
579
838
const char *out = mandos_protocol_version;
580
839
written = 0;
581
while (true){
840
while(true){
582
841
size_t out_size = strlen(out);
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
out_size - written));
585
if (ret == -1){
586
perror("write");
587
retval = -1;
842
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
843
out_size - written));
844
if(ret == -1){
845
int e = errno;
846
perror_plus("write");
847
errno = e;
588
848
goto mandos_end;
589
849
}
590
850
written += (size_t)ret;
591
851
if(written < out_size){
592
852
continue;
593
853
} else {
594
if (out == mandos_protocol_version){
854
if(out == mandos_protocol_version){
595
855
written = 0;
596
856
out = "\r\n";
597
857
} else {
598
858
break;
599
859
}
600
860
}
861
862
if(quit_now){
863
errno = EINTR;
864
goto mandos_end;
865
}
601
866
}
602
867
603
868
if(debug){
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
}
606
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
609
do{
610
ret = gnutls_handshake (session);
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
870
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
882
883
if(quit_now){
884
errno = EINTR;
885
goto mandos_end;
886
}
887
888
do {
889
ret = gnutls_handshake(session);
890
if(quit_now){
891
errno = EINTR;
892
goto mandos_end;
893
}
611
894
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
612
895
613
if (ret != GNUTLS_E_SUCCESS){
896
if(ret != GNUTLS_E_SUCCESS){
614
897
if(debug){
615
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
616
gnutls_perror (ret);
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
899
gnutls_perror(ret);
617
900
}
618
retval = -1;
901
errno = EPROTO;
619
902
goto mandos_end;
620
903
}
621
904
622
905
/* Read OpenPGP packet that contains the wanted password */
623
906
624
907
if(debug){
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
626
ip);
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
627
910
}
628
911
629
912
while(true){
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
631
buffer_capacity);
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
634
retval = -1;
635
goto mandos_end;
636
}
637
638
ret = gnutls_record_recv(session, buffer+buffer_length,
639
BUFFER_SIZE);
640
if (ret == 0){
913
914
if(quit_now){
915
errno = EINTR;
916
goto mandos_end;
917
}
918
919
buffer_capacity = incbuffer(&buffer, buffer_length,
920
buffer_capacity);
921
if(buffer_capacity == 0){
922
int e = errno;
923
perror_plus("incbuffer");
924
errno = e;
925
goto mandos_end;
926
}
927
928
if(quit_now){
929
errno = EINTR;
930
goto mandos_end;
931
}
932
933
sret = gnutls_record_recv(session, buffer+buffer_length,
934
BUFFER_SIZE);
935
if(sret == 0){
641
936
break;
642
937
}
643
if (ret < 0){
644
switch(ret){
938
if(sret < 0){
939
switch(sret){
645
940
case GNUTLS_E_INTERRUPTED:
646
941
case GNUTLS_E_AGAIN:
647
942
break;
648
943
case GNUTLS_E_REHANDSHAKE:
649
do{
650
ret = gnutls_handshake (session);
944
do {
945
ret = gnutls_handshake(session);
946
947
if(quit_now){
948
errno = EINTR;
949
goto mandos_end;
950
}
651
951
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
652
if (ret < 0){
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
654
gnutls_perror (ret);
655
retval = -1;
952
if(ret < 0){
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
955
gnutls_perror(ret);
956
errno = EPROTO;
656
957
goto mandos_end;
657
958
}
658
959
break;
659
960
default:
660
fprintf(stderr, "Unknown error while reading data from"
661
" encrypted session with Mandos server\n");
662
retval = -1;
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
963
gnutls_bye(session, GNUTLS_SHUT_RDWR);
964
errno = EIO;
664
965
goto mandos_end;
665
966
}
666
967
} else {
667
buffer_length += (size_t) ret;
968
buffer_length += (size_t) sret;
668
969
}
669
970
}
670
971
671
972
if(debug){
672
fprintf(stderr, "Closing TLS session\n");
673
}
674
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
679
buffer_length,
680
&decrypted_buffer);
681
if (decrypted_buffer_size >= 0){
973
fprintf_plus(stderr, "Closing TLS session\n");
974
}
975
976
if(quit_now){
977
errno = EINTR;
978
goto mandos_end;
979
}
980
981
do {
982
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
983
if(quit_now){
984
errno = EINTR;
985
goto mandos_end;
986
}
987
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
988
989
if(buffer_length > 0){
990
ssize_t decrypted_buffer_size;
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
993
if(decrypted_buffer_size >= 0){
994
682
995
written = 0;
683
996
while(written < (size_t) decrypted_buffer_size){
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
997
if(quit_now){
998
errno = EINTR;
999
goto mandos_end;
1000
}
1001
1002
ret = (int)fwrite(decrypted_buffer + written, 1,
1003
(size_t)decrypted_buffer_size - written,
1004
stdout);
687
1005
if(ret == 0 and ferror(stdout)){
1006
int e = errno;
688
1007
if(debug){
689
fprintf(stderr, "Error writing encrypted data: %s\n",
690
strerror(errno));
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
691
1010
}
692
retval = -1;
693
break;
1011
errno = e;
1012
goto mandos_end;
694
1013
}
695
1014
written += (size_t)ret;
696
1015
}
697
free(decrypted_buffer);
698
} else {
699
retval = -1;
1016
retval = 0;
700
1017
}
701
} else {
702
retval = -1;
703
1018
}
704
1019
705
1020
/* Shutdown procedure */
706
1021
707
1022
mandos_end:
708
free(buffer);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
710
if(ret == -1){
711
perror("close");
1023
{
1024
int e = errno;
1025
free(decrypted_buffer);
1026
free(buffer);
1027
if(tcp_sd >= 0){
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1029
}
1030
if(ret == -1){
1031
if(e == 0){
1032
e = errno;
1033
}
1034
perror_plus("close");
1035
}
1036
gnutls_deinit(session);
1037
errno = e;
1038
if(quit_now){
1039
errno = EINTR;
1040
retval = -1;
1041
}
712
1042
}
713
gnutls_deinit (session);
714
1043
return retval;
715
1044
}
716
1045
1046
__attribute__((nonnull))
717
1047
static void resolve_callback(AvahiSServiceResolver *r,
718
1048
AvahiIfIndex interface,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1049
AvahiProtocol proto,
720
1050
AvahiResolverEvent event,
721
1051
const char *name,
722
1052
const char *type,
727
1057
AVAHI_GCC_UNUSED AvahiStringList *txt,
728
1058
AVAHI_GCC_UNUSED AvahiLookupResultFlags
729
1059
flags,
730
void* userdata) {
731
mandos_context *mc = userdata;
732
assert(r);
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
733
1064
734
1065
/* Called whenever a service has been resolved successfully or
735
1066
timed out */
736
1067
737
switch (event) {
1068
if(quit_now){
1069
return;
1070
}
1071
1072
switch(event){
738
1073
default:
739
1074
case AVAHI_RESOLVER_FAILURE:
740
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
741
" of type '%s' in domain '%s': %s\n", name, type, domain,
742
avahi_strerror(avahi_server_errno(mc->server)));
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
743
1080
break;
744
1081
745
1082
case AVAHI_RESOLVER_FOUND:
747
1084
char ip[AVAHI_ADDRESS_STR_MAX];
748
1085
avahi_address_snprint(ip, sizeof(ip), address);
749
1086
if(debug){
750
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
1087
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
host_name, ip, (intmax_t)interface, port);
753
1090
}
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1095
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1097
} else {
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
757
1104
}
758
1105
}
759
1106
}
760
1107
avahi_s_service_resolver_free(r);
761
1108
}
762
1109
763
static void browse_callback( AvahiSServiceBrowser *b,
764
AvahiIfIndex interface,
765
AvahiProtocol protocol,
766
AvahiBrowserEvent event,
767
const char *name,
768
const char *type,
769
const char *domain,
770
AVAHI_GCC_UNUSED AvahiLookupResultFlags
771
flags,
772
void* userdata) {
773
mandos_context *mc = userdata;
774
assert(b);
1110
static void browse_callback(AvahiSServiceBrowser *b,
1111
AvahiIfIndex interface,
1112
AvahiProtocol protocol,
1113
AvahiBrowserEvent event,
1114
const char *name,
1115
const char *type,
1116
const char *domain,
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
775
1123
776
1124
/* Called whenever a new services becomes available on the LAN or
777
1125
is removed from the LAN */
778
1126
779
switch (event) {
1127
if(quit_now){
1128
return;
1129
}
1130
1131
switch(event){
780
1132
default:
781
1133
case AVAHI_BROWSER_FAILURE:
782
1134
783
fprintf(stderr, "(Avahi browser) %s\n",
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
786
1139
return;
787
1140
788
1141
case AVAHI_BROWSER_NEW:
791
1144
the callback function is called the Avahi server will free the
792
1145
resolver for us. */
793
1146
794
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
protocol, name, type, domain,
796
AVAHI_PROTO_INET6, 0,
797
resolve_callback, mc)))
798
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
799
name, avahi_strerror(avahi_server_errno(mc->server)));
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
800
1155
break;
801
1156
802
1157
case AVAHI_BROWSER_REMOVE:
805
1160
case AVAHI_BROWSER_ALL_FOR_NOW:
806
1161
case AVAHI_BROWSER_CACHE_EXHAUSTED:
807
1162
if(debug){
808
fprintf(stderr, "No Mandos server found, still searching...\n");
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
809
1165
}
810
1166
break;
811
1167
}
812
1168
}
813
1169
1170
/* Signal handler that stops main loop after SIGTERM */
1171
static void handle_sigterm(int sig){
1172
if(quit_now){
1173
return;
1174
}
1175
quit_now = 1;
1176
signal_received = sig;
1177
int old_errno = errno;
1178
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1181
}
1182
errno = old_errno;
1183
}
1184
1185
__attribute__((nonnull, warn_unused_result))
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
int ret;
1188
error_t ret_errno;
1189
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
if(s < 0){
1192
ret_errno = errno;
1193
perror_plus("socket");
1194
errno = ret_errno;
1195
return false;
1196
}
1197
strcpy(ifr->ifr_name, ifname);
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
if(ret == -1){
1200
if(debug){
1201
ret_errno = errno;
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1204
}
1205
return false;
1206
}
1207
return true;
1208
}
1209
1210
__attribute__((nonnull, warn_unused_result))
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1213
/* Reject the loopback device */
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
if(debug){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1218
}
1219
return false;
1220
}
1221
/* Accept point-to-point devices only if connect_to is specified */
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
if(debug){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1226
}
1227
return true;
1228
}
1229
/* Otherwise, reject non-broadcast-capable devices */
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1234
}
1235
return false;
1236
}
1237
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
if(ifr->ifr_flags & IFF_NOARP){
1239
if(debug){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1242
}
1243
return false;
1244
}
1245
1246
/* Accept this device */
1247
if(debug){
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1249
}
1250
return true;
1251
}
1252
1253
/*
1254
* This function determines if a directory entry in /sys/class/net
1255
* corresponds to an acceptable network device.
1256
* (This function is passed to scandir(3) as a filter function.)
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
int good_interface(const struct dirent *if_entry){
1260
if(if_entry->d_name[0] == '.'){
1261
return 0;
1262
}
1263
1264
struct ifreq ifr;
1265
if(not get_flags(if_entry->d_name, &ifr)){
1266
if(debug){
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1269
}
1270
return 0;
1271
}
1272
1273
if(not good_flags(if_entry->d_name, &ifr)){
1274
return 0;
1275
}
1276
return 1;
1277
}
1278
1279
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1314
int notdotentries(const struct dirent *direntry){
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1320
return 0;
1321
}
1322
return 1;
1323
}
1324
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
int runnable_hook(const struct dirent *direntry){
1328
int ret;
1329
size_t sret;
1330
struct stat st;
1331
1332
if((direntry->d_name)[0] == '\0'){
1333
/* Empty name? */
1334
return 0;
1335
}
1336
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
"abcdefghijklmnopqrstuvwxyz"
1339
"0123456789"
1340
"_.-");
1341
if((direntry->d_name)[sret] != '\0'){
1342
/* Contains non-allowed characters */
1343
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1345
direntry->d_name);
1346
}
1347
return 0;
1348
}
1349
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1351
if(ret == -1){
1352
if(debug){
1353
perror_plus("Could not stat hook");
1354
}
1355
return 0;
1356
}
1357
if(not (S_ISREG(st.st_mode))){
1358
/* Not a regular file */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1362
}
1363
return 0;
1364
}
1365
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1366
/* Not executable */
1367
if(debug){
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1370
}
1371
return 0;
1372
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1377
return 1;
1378
}
1379
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1383
int ret;
1384
struct timespec now;
1385
struct timespec waited_time;
1386
intmax_t block_time;
1387
1388
while(true){
1389
if(mc->current_server == NULL){
1390
if(debug){
1391
fprintf_plus(stderr, "Wait until first server is found."
1392
" No timeout!\n");
1393
}
1394
ret = avahi_simple_poll_iterate(s, -1);
1395
} else {
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1399
}
1400
/* the current time */
1401
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1402
if(ret == -1){
1403
perror_plus("clock_gettime");
1404
return -1;
1405
}
1406
/* Calculating in ms how long time between now and server
1407
who we visted longest time ago. Now - last seen. */
1408
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1410
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1412
/* total time is 10s/10,000ms.
1413
Converting to s from ms by dividing by 1,000,
1414
and ns to ms by dividing by 1,000,000. */
1415
block_time = ((retry_interval
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1422
}
1423
1424
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1429
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1431
return 0;
1432
}
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1435
if(ret == -1){
1436
perror_plus("clock_gettime");
1437
return -1;
1438
}
1439
mc->current_server = mc->current_server->next;
1440
block_time = 0; /* Call avahi to find new Mandos
1441
servers, but don't block */
1442
}
1443
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
}
1446
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1448
return (ret != 1) ? ret : 0;
1449
}
1450
}
1451
}
1452
}
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
__attribute__((nonnull))
1511
void run_network_hooks(const char *mode, const char *interface,
1512
const float delay){
1513
struct dirent **direntries;
1514
if(hookdir_fd == -1){
1515
hookdir_fd = open(hookdir, O_RDONLY);
1516
if(hookdir_fd == -1){
1517
if(errno == ENOENT){
1518
if(debug){
1519
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1520
" found\n", hookdir);
1521
}
1522
} else {
1523
perror_plus("open");
1524
}
1525
return;
1526
}
1527
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
1540
if(numhooks == -1){
1541
perror_plus("scandir");
1542
return;
1543
}
1544
struct dirent *direntry;
1545
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
1547
for(int i = 0; i < numhooks; i++){
1548
direntry = direntries[i];
1549
if(debug){
1550
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1551
direntry->d_name);
1552
}
1553
pid_t hook_pid = fork();
1554
if(hook_pid == 0){
1555
/* Child */
1556
/* Raise privileges */
1557
if(raise_privileges_permanently() != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1674
perror_plus("close");
1675
} else {
1676
hookdir_fd = -1;
1677
}
1678
close(devnull);
1679
}
1680
1681
__attribute__((nonnull, warn_unused_result))
1682
error_t bring_up_interface(const char *const interface,
1683
const float delay){
1684
error_t old_errno = errno;
1685
int ret;
1686
struct ifreq network;
1687
unsigned int if_index = if_nametoindex(interface);
1688
if(if_index == 0){
1689
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1690
errno = old_errno;
1691
return ENXIO;
1692
}
1693
1694
if(quit_now){
1695
errno = old_errno;
1696
return EINTR;
1697
}
1698
1699
if(not interface_is_up(interface)){
1700
error_t ret_errno = 0, ioctl_errno = 0;
1701
if(not get_flags(interface, &network)){
1702
ret_errno = errno;
1703
fprintf_plus(stderr, "Failed to get flags for interface "
1704
"\"%s\"\n", interface);
1705
errno = old_errno;
1706
return ret_errno;
1707
}
1708
network.ifr_flags |= IFF_UP; /* set flag */
1709
1710
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1711
if(sd == -1){
1712
ret_errno = errno;
1713
perror_plus("socket");
1714
errno = old_errno;
1715
return ret_errno;
1716
}
1717
1718
if(quit_now){
1719
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1720
if(ret == -1){
1721
perror_plus("close");
1722
}
1723
errno = old_errno;
1724
return EINTR;
1725
}
1726
1727
if(debug){
1728
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1729
interface);
1730
}
1731
1732
/* Raise privileges */
1733
ret_errno = raise_privileges();
1734
if(ret_errno != 0){
1735
perror_plus("Failed to raise privileges");
1736
}
1737
1738
#ifdef __linux__
1739
int ret_linux;
1740
bool restore_loglevel = false;
1741
if(ret_errno == 0){
1742
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1743
messages about the network interface to mess up the prompt */
1744
ret_linux = klogctl(8, NULL, 5);
1745
if(ret_linux == -1){
1746
perror_plus("klogctl");
1747
} else {
1748
restore_loglevel = true;
1749
}
1750
}
1751
#endif /* __linux__ */
1752
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1753
ioctl_errno = errno;
1754
#ifdef __linux__
1755
if(restore_loglevel){
1756
ret_linux = klogctl(7, NULL, 0);
1757
if(ret_linux == -1){
1758
perror_plus("klogctl");
1759
}
1760
}
1761
#endif /* __linux__ */
1762
1763
/* If raise_privileges() succeeded above */
1764
if(ret_errno == 0){
1765
/* Lower privileges */
1766
ret_errno = lower_privileges();
1767
if(ret_errno != 0){
1768
errno = ret_errno;
1769
perror_plus("Failed to lower privileges");
1770
}
1771
}
1772
1773
/* Close the socket */
1774
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ioctl_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1782
errno = old_errno;
1783
return ioctl_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1787
interface);
1788
}
1789
1790
/* Sleep checking until interface is running.
1791
Check every 0.25s, up to total time of delay */
1792
for(int i=0; i < delay * 4; i++){
1793
if(interface_is_running(interface)){
1794
break;
1795
}
1796
struct timespec sleeptime = { .tv_nsec = 250000000 };
1797
ret = nanosleep(&sleeptime, NULL);
1798
if(ret == -1 and errno != EINTR){
1799
perror_plus("nanosleep");
1800
}
1801
}
1802
1803
errno = old_errno;
1804
return 0;
1805
}
1806
1807
__attribute__((nonnull, warn_unused_result))
1808
error_t take_down_interface(const char *const interface){
1809
error_t old_errno = errno;
1810
struct ifreq network;
1811
unsigned int if_index = if_nametoindex(interface);
1812
if(if_index == 0){
1813
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1814
errno = old_errno;
1815
return ENXIO;
1816
}
1817
if(interface_is_up(interface)){
1818
error_t ret_errno = 0, ioctl_errno = 0;
1819
if(not get_flags(interface, &network) and debug){
1820
ret_errno = errno;
1821
fprintf_plus(stderr, "Failed to get flags for interface "
1822
"\"%s\"\n", interface);
1823
errno = old_errno;
1824
return ret_errno;
1825
}
1826
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1827
1828
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1829
if(sd == -1){
1830
ret_errno = errno;
1831
perror_plus("socket");
1832
errno = old_errno;
1833
return ret_errno;
1834
}
1835
1836
if(debug){
1837
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1838
interface);
1839
}
1840
1841
/* Raise privileges */
1842
ret_errno = raise_privileges();
1843
if(ret_errno != 0){
1844
perror_plus("Failed to raise privileges");
1845
}
1846
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1849
1850
/* If raise_privileges() succeeded above */
1851
if(ret_errno == 0){
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1854
if(ret_errno != 0){
1855
errno = ret_errno;
1856
perror_plus("Failed to lower privileges");
1857
}
1858
}
1859
1860
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1862
if(ret == -1){
1863
perror_plus("close");
1864
}
1865
1866
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1868
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1869
errno = old_errno;
1870
return ioctl_errno;
1871
}
1872
} else if(debug){
1873
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1874
interface);
1875
}
1876
1877
errno = old_errno;
1878
return 0;
1879
}
1880
814
1881
int main(int argc, char *argv[]){
815
AvahiSServiceBrowser *sb = NULL;
816
int error;
817
int ret;
818
int exitcode = EXIT_SUCCESS;
819
const char *interface = "eth0";
820
struct ifreq network;
821
int sd;
822
uid_t uid;
823
gid_t gid;
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
829
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
835
836
{
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
843
.group = 1 },
844
{ .name = "interface", .key = 'i',
845
.arg = "NAME",
846
.doc = "Interface that will be used to search for Mandos"
847
" servers",
848
.group = 1 },
849
{ .name = "seckey", .key = 's',
850
.arg = "FILE",
851
.doc = "OpenPGP secret key file base name",
852
.group = 1 },
853
{ .name = "pubkey", .key = 'p',
854
.arg = "FILE",
855
.doc = "OpenPGP public key file base name",
856
.group = 2 },
857
{ .name = "dh-bits", .key = 129,
858
.arg = "BITS",
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
861
.group = 2 },
862
{ .name = "priority", .key = 130,
863
.arg = "STRING",
864
.doc = "GnuTLS priority string for the TLS handshake",
865
.group = 1 },
866
{ .name = NULL }
867
};
868
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
873
switch (key) {
874
case 128: /* --debug */
875
debug = true;
876
break;
877
case 'c': /* --connect */
878
connect_to = arg;
879
break;
880
case 'i': /* --interface */
881
interface = arg;
882
break;
883
case 's': /* --seckey */
884
seckey = arg;
885
break;
886
case 'p': /* --pubkey */
887
pubkey = arg;
888
break;
889
case 129: /* --dh-bits */
890
errno = 0;
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
892
if (errno){
893
perror("strtol");
894
exit(EXIT_FAILURE);
895
}
896
break;
897
case 130: /* --priority */
898
mc.priority = arg;
899
break;
900
case ARGP_KEY_ARG:
901
argp_usage (state);
902
case ARGP_KEY_END:
903
break;
904
default:
905
return ARGP_ERR_UNKNOWN;
906
}
907
return 0;
908
}
909
910
struct argp argp = { .options = options, .parser = parse_opt,
911
.args_doc = "",
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
922
/* If the interface is down, bring it up */
923
{
924
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
if(sd < 0) {
926
perror("socket");
927
exitcode = EXIT_FAILURE;
928
goto end;
929
}
930
strcpy(network.ifr_name, interface);
931
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
if(ret == -1){
933
perror("ioctl SIOCGIFFLAGS");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
if((network.ifr_flags & IFF_UP) == 0){
938
network.ifr_flags |= IFF_UP;
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCSIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
}
946
ret = TEMP_FAILURE_RETRY(close(sd));
947
if(ret == -1){
948
perror("close");
949
}
950
}
951
952
uid = getuid();
953
gid = getgid();
954
955
ret = setuid(uid);
956
if (ret == -1){
957
perror("setuid");
958
}
959
960
setgid(gid);
961
if (ret == -1){
962
perror("setgid");
963
}
964
965
ret = init_gnutls_global(&mc, pubkey, seckey);
966
if (ret == -1){
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
969
goto end;
970
} else {
971
gnutls_initalized = true;
972
}
973
974
if(mkdtemp(tempdir) == NULL){
975
perror("mkdtemp");
976
tempdir[0] = '\0';
977
goto end;
978
}
979
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
} else {
985
gpgme_initalized = true;
986
}
987
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
if(if_index == 0){
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
991
exit(EXIT_FAILURE);
992
}
993
994
if(connect_to != NULL){
995
/* Connect directly, do not use Zeroconf */
996
/* (Mainly meant for debugging) */
997
char *address = strrchr(connect_to, ':');
998
if(address == NULL){
999
fprintf(stderr, "No colon in address\n");
1000
exitcode = EXIT_FAILURE;
1001
goto end;
1002
}
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1886
AvahiSServiceBrowser *sb = NULL;
1887
error_t ret_errno;
1888
int ret;
1889
intmax_t tmpmax;
1890
char *tmp;
1891
int exitcode = EXIT_SUCCESS;
1892
char *interfaces_to_take_down = NULL;
1893
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
const char *seckey = PATHDIR "/" SECKEY;
1899
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
1901
1902
bool gnutls_initialized = false;
1903
bool gpgme_initialized = false;
1904
float delay = 2.5f;
1905
double retry_interval = 10; /* 10s between trying a server and
1906
retrying the same server again */
1907
1908
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1909
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1910
1911
uid = getuid();
1912
gid = getgid();
1913
1914
/* Lower any group privileges we might have, just to be safe */
1915
errno = 0;
1916
ret = setgid(gid);
1917
if(ret == -1){
1918
perror_plus("setgid");
1919
}
1920
1921
/* Lower user privileges (temporarily) */
1922
errno = 0;
1923
ret = seteuid(uid);
1924
if(ret == -1){
1925
perror_plus("seteuid");
1926
}
1927
1928
if(quit_now){
1929
goto end;
1930
}
1931
1932
{
1933
struct argp_option options[] = {
1934
{ .name = "debug", .key = 128,
1935
.doc = "Debug mode", .group = 3 },
1936
{ .name = "connect", .key = 'c',
1937
.arg = "ADDRESS:PORT",
1938
.doc = "Connect directly to a specific Mandos server",
1939
.group = 1 },
1940
{ .name = "interface", .key = 'i',
1941
.arg = "NAME",
1942
.doc = "Network interface that will be used to search for"
1943
" Mandos servers",
1944
.group = 1 },
1945
{ .name = "seckey", .key = 's',
1946
.arg = "FILE",
1947
.doc = "OpenPGP secret key file base name",
1948
.group = 1 },
1949
{ .name = "pubkey", .key = 'p',
1950
.arg = "FILE",
1951
.doc = "OpenPGP public key file base name",
1952
.group = 2 },
1953
{ .name = "dh-bits", .key = 129,
1954
.arg = "BITS",
1955
.doc = "Bit length of the prime number used in the"
1956
" Diffie-Hellman key exchange",
1957
.group = 2 },
1958
{ .name = "priority", .key = 130,
1959
.arg = "STRING",
1960
.doc = "GnuTLS priority string for the TLS handshake",
1961
.group = 1 },
1962
{ .name = "delay", .key = 131,
1963
.arg = "SECONDS",
1964
.doc = "Maximum delay to wait for interface startup",
1965
.group = 2 },
1966
{ .name = "retry", .key = 132,
1967
.arg = "SECONDS",
1968
.doc = "Retry interval used when denied by the Mandos server",
1969
.group = 2 },
1970
{ .name = "network-hook-dir", .key = 133,
1971
.arg = "DIR",
1972
.doc = "Directory where network hooks are located",
1973
.group = 2 },
1974
/*
1975
* These reproduce what we would get without ARGP_NO_HELP
1976
*/
1977
{ .name = "help", .key = '?',
1978
.doc = "Give this help list", .group = -1 },
1979
{ .name = "usage", .key = -3,
1980
.doc = "Give a short usage message", .group = -1 },
1981
{ .name = "version", .key = 'V',
1982
.doc = "Print program version", .group = -1 },
1983
{ .name = NULL }
1984
};
1985
1986
error_t parse_opt(int key, char *arg,
1987
struct argp_state *state){
1003
1988
errno = 0;
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
if(errno){
1006
perror("Bad port number");
1007
exitcode = EXIT_FAILURE;
1989
switch(key){
1990
case 128: /* --debug */
1991
debug = true;
1992
break;
1993
case 'c': /* --connect */
1994
connect_to = arg;
1995
break;
1996
case 'i': /* --interface */
1997
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1998
arg, (int)',');
1999
if(ret_errno != 0){
2000
argp_error(state, "%s", strerror(ret_errno));
2001
}
2002
break;
2003
case 's': /* --seckey */
2004
seckey = arg;
2005
break;
2006
case 'p': /* --pubkey */
2007
pubkey = arg;
2008
break;
2009
case 129: /* --dh-bits */
2010
errno = 0;
2011
tmpmax = strtoimax(arg, &tmp, 10);
2012
if(errno != 0 or tmp == arg or *tmp != '\0'
2013
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2014
argp_error(state, "Bad number of DH bits");
2015
}
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2017
break;
2018
case 130: /* --priority */
2019
mc.priority = arg;
2020
break;
2021
case 131: /* --delay */
2022
errno = 0;
2023
delay = strtof(arg, &tmp);
2024
if(errno != 0 or tmp == arg or *tmp != '\0'){
2025
argp_error(state, "Bad delay");
2026
}
2027
case 132: /* --retry */
2028
errno = 0;
2029
retry_interval = strtod(arg, &tmp);
2030
if(errno != 0 or tmp == arg or *tmp != '\0'
2031
or (retry_interval * 1000) > INT_MAX
2032
or retry_interval < 0){
2033
argp_error(state, "Bad retry interval");
2034
}
2035
break;
2036
case 133: /* --network-hook-dir */
2037
hookdir = arg;
2038
break;
2039
/*
2040
* These reproduce what we would get without ARGP_NO_HELP
2041
*/
2042
case '?': /* --help */
2043
argp_state_help(state, state->out_stream,
2044
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2045
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2046
case -3: /* --usage */
2047
argp_state_help(state, state->out_stream,
2048
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2049
case 'V': /* --version */
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2051
exit(argp_err_exit_status);
2052
break;
2053
default:
2054
return ARGP_ERR_UNKNOWN;
2055
}
2056
return errno;
2057
}
2058
2059
struct argp argp = { .options = options, .parser = parse_opt,
2060
.args_doc = "",
2061
.doc = "Mandos client -- Get and decrypt"
2062
" passwords from a Mandos server" };
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2066
case 0:
2067
break;
2068
case ENOMEM:
2069
default:
2070
errno = ret;
2071
perror_plus("argp_parse");
2072
exitcode = EX_OSERR;
2073
goto end;
2074
case EINVAL:
2075
exitcode = EX_USAGE;
2076
goto end;
2077
}
2078
}
2079
2080
{
2081
/* Work around Debian bug #633582:
2082
<http://bugs.debian.org/633582> */
2083
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2088
perror_plus("Failed to raise privileges");
2089
} else {
2090
struct stat st;
2091
2092
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2093
int seckey_fd = open(seckey, O_RDONLY);
2094
if(seckey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(seckey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2110
}
2111
}
2112
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2115
if(pubkey_fd == -1){
2116
perror_plus("open");
2117
} else {
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2119
if(ret == -1){
2120
perror_plus("fstat");
2121
} else {
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(pubkey_fd, uid, gid);
2125
if(ret == -1){
2126
perror_plus("fchown");
2127
}
2128
}
2129
}
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2134
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
2139
}
2140
}
2141
}
2142
2143
/* Remove invalid interface names (except "none") */
2144
{
2145
char *interface = NULL;
2146
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2147
interface))){
2148
if(strcmp(interface, "none") != 0
2149
and if_nametoindex(interface) == 0){
2150
if(interface[0] != '\0'){
2151
fprintf_plus(stderr, "Not using nonexisting interface"
2152
" \"%s\"\n", interface);
2153
}
2154
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2155
interface = NULL;
2156
}
2157
}
2158
}
2159
2160
/* Run network hooks */
2161
{
2162
if(mc.interfaces != NULL){
2163
interfaces_hooks = malloc(mc.interfaces_size);
2164
if(interfaces_hooks == NULL){
2165
perror_plus("malloc");
1008
2166
goto end;
1009
2167
}
1010
*address = '\0';
1011
address = connect_to;
1012
ret = start_mandos_communication(address, port, if_index, &mc);
1013
if(ret < 0){
1014
exitcode = EXIT_FAILURE;
1015
} else {
1016
exitcode = EXIT_SUCCESS;
1017
}
1018
goto end;
1019
}
1020
1021
if (not debug){
1022
avahi_set_log_function(empty_log);
1023
}
1024
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
1028
/* Allocate main Avahi loop object */
1029
mc.simple_poll = avahi_simple_poll_new();
1030
if (mc.simple_poll == NULL) {
1031
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
" object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
{
1038
AvahiServerConfig config;
1039
/* Do not publish any local Zeroconf records */
1040
avahi_server_config_init(&config);
1041
config.publish_hinfo = 0;
1042
config.publish_addresses = 0;
1043
config.publish_workstation = 0;
1044
config.publish_domain = 0;
1045
1046
/* Allocate a new server */
1047
mc.server = avahi_server_new(avahi_simple_poll_get
1048
(mc.simple_poll), &config, NULL,
1049
NULL, &error);
1050
1051
/* Free the Avahi configuration data */
1052
avahi_server_config_free(&config);
1053
}
1054
1055
/* Check if creating the Avahi server object succeeded */
1056
if (mc.server == NULL) {
1057
fprintf(stderr, "Failed to create Avahi server: %s\n",
1058
avahi_strerror(error));
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* Create the Avahi service browser */
1064
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
AVAHI_PROTO_INET6,
1066
"_mandos._tcp", NULL, 0,
1067
browse_callback, &mc);
1068
if (sb == NULL) {
1069
fprintf(stderr, "Failed to create service browser: %s\n",
1070
avahi_strerror(avahi_server_errno(mc.server)));
1071
exitcode = EXIT_FAILURE;
1072
goto end;
1073
}
1074
1075
/* Run the main loop */
1076
1077
if (debug){
1078
fprintf(stderr, "Starting Avahi loop search\n");
1079
}
1080
1081
avahi_simple_poll_loop(mc.simple_poll);
1082
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2170
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
2173
}
2174
2175
if(not debug){
2176
avahi_set_log_function(empty_log);
2177
}
2178
2179
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2180
from the signal handler */
2181
/* Initialize the pseudo-RNG for Avahi */
2182
srand((unsigned int) time(NULL));
2183
simple_poll = avahi_simple_poll_new();
2184
if(simple_poll == NULL){
2185
fprintf_plus(stderr,
2186
"Avahi: Failed to create simple poll object.\n");
2187
exitcode = EX_UNAVAILABLE;
2188
goto end;
2189
}
2190
2191
sigemptyset(&sigterm_action.sa_mask);
2192
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2193
if(ret == -1){
2194
perror_plus("sigaddset");
2195
exitcode = EX_OSERR;
2196
goto end;
2197
}
2198
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2199
if(ret == -1){
2200
perror_plus("sigaddset");
2201
exitcode = EX_OSERR;
2202
goto end;
2203
}
2204
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2205
if(ret == -1){
2206
perror_plus("sigaddset");
2207
exitcode = EX_OSERR;
2208
goto end;
2209
}
2210
/* Need to check if the handler is SIG_IGN before handling:
2211
| [[info:libc:Initial Signal Actions]] |
2212
| [[info:libc:Basic Signal Handling]] |
2213
*/
2214
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2215
if(ret == -1){
2216
perror_plus("sigaction");
2217
return EX_OSERR;
2218
}
2219
if(old_sigterm_action.sa_handler != SIG_IGN){
2220
ret = sigaction(SIGINT, &sigterm_action, NULL);
2221
if(ret == -1){
2222
perror_plus("sigaction");
2223
exitcode = EX_OSERR;
2224
goto end;
2225
}
2226
}
2227
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2228
if(ret == -1){
2229
perror_plus("sigaction");
2230
return EX_OSERR;
2231
}
2232
if(old_sigterm_action.sa_handler != SIG_IGN){
2233
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2234
if(ret == -1){
2235
perror_plus("sigaction");
2236
exitcode = EX_OSERR;
2237
goto end;
2238
}
2239
}
2240
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2241
if(ret == -1){
2242
perror_plus("sigaction");
2243
return EX_OSERR;
2244
}
2245
if(old_sigterm_action.sa_handler != SIG_IGN){
2246
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2247
if(ret == -1){
2248
perror_plus("sigaction");
2249
exitcode = EX_OSERR;
2250
goto end;
2251
}
2252
}
2253
2254
/* If no interfaces were specified, make a list */
2255
if(mc.interfaces == NULL){
2256
struct dirent **direntries = NULL;
2257
/* Look for any good interfaces */
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2259
alphasort);
2260
if(ret >= 1){
2261
/* Add all found interfaces to interfaces list */
2262
for(int i = 0; i < ret; ++i){
2263
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2264
direntries[i]->d_name);
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("argz_add");
2268
continue;
2269
}
2270
if(debug){
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
direntries[i]->d_name);
2273
}
2274
}
2275
free(direntries);
2276
} else {
2277
free(direntries);
2278
fprintf_plus(stderr, "Could not find a network interface\n");
2279
exitcode = EXIT_FAILURE;
2280
goto end;
2281
}
2282
}
2283
2284
/* Bring up interfaces which are down, and remove any "none"s */
2285
{
2286
char *interface = NULL;
2287
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2288
interface))){
2289
/* If interface name is "none", stop bringing up interfaces.
2290
Also remove all instances of "none" from the list */
2291
if(strcmp(interface, "none") == 0){
2292
argz_delete(&mc.interfaces, &mc.interfaces_size,
2293
interface);
2294
interface = NULL;
2295
while((interface = argz_next(mc.interfaces,
2296
mc.interfaces_size, interface))){
2297
if(strcmp(interface, "none") == 0){
2298
argz_delete(&mc.interfaces, &mc.interfaces_size,
2299
interface);
2300
interface = NULL;
2301
}
2302
}
2303
break;
2304
}
2305
bool interface_was_up = interface_is_up(interface);
2306
errno = bring_up_interface(interface, delay);
2307
if(not interface_was_up){
2308
if(errno != 0){
2309
perror_plus("Failed to bring up interface");
2310
} else {
2311
errno = argz_add(&interfaces_to_take_down,
2312
&interfaces_to_take_down_size,
2313
interface);
2314
if(errno != 0){
2315
perror_plus("argz_add");
2316
}
2317
}
2318
}
2319
}
2320
if(debug and (interfaces_to_take_down == NULL)){
2321
fprintf_plus(stderr, "No interfaces were brought up\n");
2322
}
2323
}
2324
2325
/* If we only got one interface, explicitly use only that one */
2326
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2327
if(debug){
2328
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2329
mc.interfaces);
2330
}
2331
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2332
}
2333
2334
if(quit_now){
2335
goto end;
2336
}
2337
2338
ret = init_gnutls_global(pubkey, seckey, &mc);
2339
if(ret == -1){
2340
fprintf_plus(stderr, "init_gnutls_global failed\n");
2341
exitcode = EX_UNAVAILABLE;
2342
goto end;
2343
} else {
2344
gnutls_initialized = true;
2345
}
2346
2347
if(quit_now){
2348
goto end;
2349
}
2350
2351
/* Try /run/tmp before /tmp */
2352
tempdir = mkdtemp(run_tempdir);
2353
if(tempdir == NULL and errno == ENOENT){
2354
if(debug){
2355
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2356
run_tempdir, old_tempdir);
2357
}
2358
tempdir = mkdtemp(old_tempdir);
2359
}
2360
if(tempdir == NULL){
2361
perror_plus("mkdtemp");
2362
goto end;
2363
}
2364
2365
if(quit_now){
2366
goto end;
2367
}
2368
2369
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2370
fprintf_plus(stderr, "init_gpgme failed\n");
2371
exitcode = EX_UNAVAILABLE;
2372
goto end;
2373
} else {
2374
gpgme_initialized = true;
2375
}
2376
2377
if(quit_now){
2378
goto end;
2379
}
2380
2381
if(connect_to != NULL){
2382
/* Connect directly, do not use Zeroconf */
2383
/* (Mainly meant for debugging) */
2384
char *address = strrchr(connect_to, ':');
2385
2386
if(address == NULL){
2387
fprintf_plus(stderr, "No colon in address\n");
2388
exitcode = EX_USAGE;
2389
goto end;
2390
}
2391
2392
if(quit_now){
2393
goto end;
2394
}
2395
2396
in_port_t port;
2397
errno = 0;
2398
tmpmax = strtoimax(address+1, &tmp, 10);
2399
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2400
or tmpmax != (in_port_t)tmpmax){
2401
fprintf_plus(stderr, "Bad port number\n");
2402
exitcode = EX_USAGE;
2403
goto end;
2404
}
2405
2406
if(quit_now){
2407
goto end;
2408
}
2409
2410
port = (in_port_t)tmpmax;
2411
*address = '\0';
2412
/* Colon in address indicates IPv6 */
2413
int af;
2414
if(strchr(connect_to, ':') != NULL){
2415
af = AF_INET6;
2416
/* Accept [] around IPv6 address - see RFC 5952 */
2417
if(connect_to[0] == '[' and address[-1] == ']')
2418
{
2419
connect_to++;
2420
address[-1] = '\0';
2421
}
2422
} else {
2423
af = AF_INET;
2424
}
2425
address = connect_to;
2426
2427
if(quit_now){
2428
goto end;
2429
}
2430
2431
while(not quit_now){
2432
ret = start_mandos_communication(address, port, if_index, af,
2433
&mc);
2434
if(quit_now or ret == 0){
2435
break;
2436
}
2437
if(debug){
2438
fprintf_plus(stderr, "Retrying in %d seconds\n",
2439
(int)retry_interval);
2440
}
2441
sleep((unsigned int)retry_interval);
2442
}
2443
2444
if(not quit_now){
2445
exitcode = EXIT_SUCCESS;
2446
}
2447
2448
goto end;
2449
}
2450
2451
if(quit_now){
2452
goto end;
2453
}
2454
2455
{
2456
AvahiServerConfig config;
2457
/* Do not publish any local Zeroconf records */
2458
avahi_server_config_init(&config);
2459
config.publish_hinfo = 0;
2460
config.publish_addresses = 0;
2461
config.publish_workstation = 0;
2462
config.publish_domain = 0;
2463
2464
/* Allocate a new server */
2465
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2466
&config, NULL, NULL, &ret_errno);
2467
2468
/* Free the Avahi configuration data */
2469
avahi_server_config_free(&config);
2470
}
2471
2472
/* Check if creating the Avahi server object succeeded */
2473
if(mc.server == NULL){
2474
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2475
avahi_strerror(ret_errno));
2476
exitcode = EX_UNAVAILABLE;
2477
goto end;
2478
}
2479
2480
if(quit_now){
2481
goto end;
2482
}
2483
2484
/* Create the Avahi service browser */
2485
sb = avahi_s_service_browser_new(mc.server, if_index,
2486
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2487
NULL, 0, browse_callback,
2488
(void *)&mc);
2489
if(sb == NULL){
2490
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2491
avahi_strerror(avahi_server_errno(mc.server)));
2492
exitcode = EX_UNAVAILABLE;
2493
goto end;
2494
}
2495
2496
if(quit_now){
2497
goto end;
2498
}
2499
2500
/* Run the main loop */
2501
2502
if(debug){
2503
fprintf_plus(stderr, "Starting Avahi loop search\n");
2504
}
2505
2506
ret = avahi_loop_with_timeout(simple_poll,
2507
(int)(retry_interval * 1000), &mc);
2508
if(debug){
2509
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2510
(ret == 0) ? "successfully" : "with error");
2511
}
2512
1083
2513
end:
1084
1085
if (debug){
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1087
}
1088
1089
/* Cleanup things */
1090
if (sb != NULL)
1091
avahi_s_service_browser_free(sb);
1092
1093
if (mc.server != NULL)
1094
avahi_server_free(mc.server);
1095
1096
if (mc.simple_poll != NULL)
1097
avahi_simple_poll_free(mc.simple_poll);
1098
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1103
}
1104
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1107
}
1108
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1111
DIR *d;
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1114
if(d == NULL){
1115
perror("opendir");
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1){
1142
perror("rmdir");
1143
}
1144
}
1145
1146
return exitcode;
2514
2515
if(debug){
2516
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2517
}
2518
2519
/* Cleanup things */
2520
free(mc.interfaces);
2521
2522
if(sb != NULL)
2523
avahi_s_service_browser_free(sb);
2524
2525
if(mc.server != NULL)
2526
avahi_server_free(mc.server);
2527
2528
if(simple_poll != NULL)
2529
avahi_simple_poll_free(simple_poll);
2530
2531
if(gnutls_initialized){
2532
gnutls_certificate_free_credentials(mc.cred);
2533
gnutls_global_deinit();
2534
gnutls_dh_params_deinit(mc.dh_params);
2535
}
2536
2537
if(gpgme_initialized){
2538
gpgme_release(mc.ctx);
2539
}
2540
2541
/* Cleans up the circular linked list of Mandos servers the client
2542
has seen */
2543
if(mc.current_server != NULL){
2544
mc.current_server->prev->next = NULL;
2545
while(mc.current_server != NULL){
2546
server *next = mc.current_server->next;
2547
free(mc.current_server);
2548
mc.current_server = next;
2549
}
2550
}
2551
2552
/* Re-raise privileges */
2553
{
2554
ret_errno = raise_privileges();
2555
if(ret_errno != 0){
2556
perror_plus("Failed to raise privileges");
2557
} else {
2558
2559
/* Run network hooks */
2560
run_network_hooks("stop", interfaces_hooks != NULL ?
2561
interfaces_hooks : "", delay);
2562
2563
/* Take down the network interfaces which were brought up */
2564
{
2565
char *interface = NULL;
2566
while((interface=argz_next(interfaces_to_take_down,
2567
interfaces_to_take_down_size,
2568
interface))){
2569
ret_errno = take_down_interface(interface);
2570
if(ret_errno != 0){
2571
errno = ret_errno;
2572
perror_plus("Failed to take down interface");
2573
}
2574
}
2575
if(debug and (interfaces_to_take_down == NULL)){
2576
fprintf_plus(stderr, "No interfaces needed to be taken"
2577
" down\n");
2578
}
2579
}
2580
}
2581
2582
ret_errno = lower_privileges_permanently();
2583
if(ret_errno != 0){
2584
perror_plus("Failed to lower privileges permanently");
2585
}
2586
}
2587
2588
free(interfaces_to_take_down);
2589
free(interfaces_hooks);
2590
2591
/* Removes the GPGME temp directory and all files inside */
2592
if(tempdir != NULL){
2593
struct dirent **direntries = NULL;
2594
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2595
O_NOFOLLOW));
2596
if(tempdir_fd == -1){
2597
perror_plus("open");
2598
} else {
2599
#ifdef __GLIBC__
2600
#if __GLIBC_PREREQ(2, 15)
2601
int numentries = scandirat(tempdir_fd, ".", &direntries,
2602
notdotentries, alphasort);
2603
#else /* not __GLIBC_PREREQ(2, 15) */
2604
int numentries = scandir(tempdir, &direntries, notdotentries,
2605
alphasort);
2606
#endif /* not __GLIBC_PREREQ(2, 15) */
2607
#else /* not __GLIBC__ */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC__ */
2611
if(numentries > 0){
2612
for(int i = 0; i < numentries; i++){
2613
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2614
if(ret == -1){
2615
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2616
" \"%s\", 0): %s\n", tempdir,
2617
direntries[i]->d_name, strerror(errno));
2618
}
2619
}
2620
2621
/* need to clean even if 0 because man page doesn't specify */
2622
free(direntries);
2623
if(numentries == -1){
2624
perror_plus("scandir");
2625
}
2626
ret = rmdir(tempdir);
2627
if(ret == -1 and errno != ENOENT){
2628
perror_plus("rmdir");
2629
}
2630
}
2631
TEMP_FAILURE_RETRY(close(tempdir_fd));
2632
}
2633
}
2634
2635
if(quit_now){
2636
sigemptyset(&old_sigterm_action.sa_mask);
2637
old_sigterm_action.sa_handler = SIG_DFL;
2638
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2639
&old_sigterm_action,
2640
NULL));
2641
if(ret == -1){
2642
perror_plus("sigaction");
2643
}
2644
do {
2645
ret = raise(signal_received);
2646
} while(ret != 0 and errno == EINTR);
2647
if(ret != 0){
2648
perror_plus("raise");
2649
abort();
2650
}
2651
TEMP_FAILURE_RETRY(pause());
2652
}
2653
2654
return exitcode;
1147
2655
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0