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- Committer: Teddy Hogeborn
- Date: 2016-10-01 14:24:14 UTC
- Revision ID: teddy@recompile.se-20161001142414-y53pczg9ll0r2q4y
Tags: version-1.7.11-1
* Makefile (version): Change to 1.7.11.
* NEWS (Version 1.7.11): Add new entry.
* debian/changelog (1.7.11-1): - '' -
* NEWS (Version 1.7.11): Add new entry.
* debian/changelog (1.7.11-1): - '' -
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
46
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
52
#include <sys/ioctl.h> /* ioctl */
49
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
54
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
55
SOCK_STREAM, uid_t, gid_t, open(),
56
opendir(), DIR */
57
#include <sys/stat.h> /* open(), S_ISREG */
55
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
57
connect() */
58
#include <fcntl.h> /* open() */
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
59
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
63
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
71
program_invocation_short_name */
72
#include <time.h> /* nanosleep(), time(), sleep() */
65
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
74
SIOCSIFFLAGS, if_indextoname(),
67
75
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
76
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
77
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
78
*/
69
79
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
80
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
84
#include <iso646.h> /* not, or, and */
74
85
#include <argp.h> /* struct argp_option, error_t, struct
75
86
argp_state, struct argp,
76
87
argp_parse(), ARGP_KEY_ARG,
77
88
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
89
#include <signal.h> /* sigemptyset(), sigaddset(),
90
sigaction(), SIGTERM, sig_atomic_t,
91
raise() */
92
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
93
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
94
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
95
WEXITSTATUS(), WTERMSIG() */
96
#include <grp.h> /* setgroups() */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
103
78
104
#ifdef __linux__
79
105
#include <sys/klog.h> /* klogctl() */
80
#endif
106
#endif /* __linux__ */
81
107
82
108
/* Avahi */
83
109
/* All Avahi types, constants and functions
97
123
init_gnutls_session(),
98
124
GNUTLS_* */
99
125
#include <gnutls/openpgp.h>
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
126
/* gnutls_certificate_set_openpgp_key_file(),
127
GNUTLS_OPENPGP_FMT_BASE64 */
102
128
103
129
/* GPGME */
104
130
#include <gpgme.h> /* All GPGME types, constants and
112
138
#define PATHDIR "/conf/conf.d/mandos"
113
139
#define SECKEY "seckey.txt"
114
140
#define PUBKEY "pubkey.txt"
141
#define HOOKDIR "/lib/mandos/network-hooks.d"
115
142
116
143
bool debug = false;
117
144
static const char mandos_protocol_version[] = "1";
118
145
const char *argp_program_version = "mandos-client " VERSION;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
146
const char *argp_program_bug_address = "<mandos@recompile.se>";
147
static const char sys_class_net[] = "/sys/class/net";
148
char *connect_to = NULL;
149
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
uid_t uid = 65534;
152
gid_t gid = 65534;
153
154
/* Doubly linked list that need to be circularly linked when used */
155
typedef struct server{
156
const char *ip;
157
in_port_t port;
158
AvahiIfIndex if_index;
159
int af;
160
struct timespec last_seen;
161
struct server *next;
162
struct server *prev;
163
} server;
120
164
121
165
/* Used for passing in values through the Avahi callback functions */
122
166
typedef struct {
123
AvahiSimplePoll *simple_poll;
124
167
AvahiServer *server;
125
168
gnutls_certificate_credentials_t cred;
126
169
unsigned int dh_bits;
127
170
gnutls_dh_params_t dh_params;
128
171
const char *priority;
129
172
gpgme_ctx_t ctx;
173
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
130
176
} mandos_context;
131
177
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
180
181
sig_atomic_t quit_now = 0;
182
int signal_received = 0;
183
184
/* Function to use when printing errors */
185
void perror_plus(const char *print_text){
186
int e = errno;
187
fprintf(stderr, "Mandos plugin %s: ",
188
program_invocation_short_name);
189
errno = e;
190
perror(print_text);
191
}
192
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
194
int fprintf_plus(FILE *stream, const char *format, ...){
195
va_list ap;
196
va_start (ap, format);
197
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
}
202
132
203
/*
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
204
* Make additional room in "buffer" for at least BUFFER_SIZE more
205
* bytes. "buffer_capacity" is how much is currently allocated,
135
206
* "buffer_length" is how much is already used.
136
207
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
208
__attribute__((nonnull, warn_unused_result))
209
size_t incbuffer(char **buffer, size_t buffer_length,
210
size_t buffer_capacity){
139
211
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
141
if(buffer == NULL){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
142
218
return 0;
143
219
}
220
*buffer = new_buf;
144
221
buffer_capacity += BUFFER_SIZE;
145
222
}
146
223
return buffer_capacity;
147
224
}
148
225
226
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
230
int ret;
231
server *new_server = malloc(sizeof(server));
232
if(new_server == NULL){
233
perror_plus("malloc");
234
return false;
235
}
236
*new_server = (server){ .ip = strdup(ip),
237
.port = port,
238
.if_index = if_index,
239
.af = af };
240
if(new_server->ip == NULL){
241
perror_plus("strdup");
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
return false;
258
}
259
/* Special case of first server */
260
if(*current_server == NULL){
261
new_server->next = new_server;
262
new_server->prev = new_server;
263
*current_server = new_server;
264
} else {
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
268
new_server->prev->next = new_server;
269
(*current_server)->prev = new_server;
270
}
271
return true;
272
}
273
149
274
/*
150
275
* Initialize GPGME.
151
276
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
155
282
gpgme_error_t rc;
156
283
gpgme_engine_info_t engine_info;
157
284
158
159
285
/*
160
286
* Helper function to insert pub and seckey to the engine keyring.
161
287
*/
162
bool import_key(const char *filename){
288
bool import_key(const char * const filename){
289
int ret;
163
290
int fd;
164
291
gpgme_data_t pgp_data;
165
292
166
293
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
167
294
if(fd == -1){
168
perror("open");
295
perror_plus("open");
169
296
return false;
170
297
}
171
298
172
299
rc = gpgme_data_new_from_fd(&pgp_data, fd);
173
300
if(rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
176
303
return false;
177
304
}
178
305
179
306
rc = gpgme_op_import(mc->ctx, pgp_data);
180
307
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
183
310
return false;
184
311
}
185
312
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
ret = close(fd);
187
314
if(ret == -1){
188
perror("close");
315
perror_plus("close");
189
316
}
190
317
gpgme_data_release(pgp_data);
191
318
return true;
192
319
}
193
320
194
321
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
322
fprintf_plus(stderr, "Initializing GPGME\n");
196
323
}
197
324
198
325
/* Init GPGME */
199
326
gpgme_check_version(NULL);
200
327
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
201
328
if(rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
329
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
330
gpgme_strsource(rc), gpgme_strerror(rc));
204
331
return false;
205
332
}
206
333
207
/* Set GPGME home directory for the OpenPGP engine only */
334
/* Set GPGME home directory for the OpenPGP engine only */
208
335
rc = gpgme_get_engine_info(&engine_info);
209
336
if(rc != GPG_ERR_NO_ERROR){
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
337
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
338
gpgme_strsource(rc), gpgme_strerror(rc));
212
339
return false;
213
340
}
214
341
while(engine_info != NULL){
220
347
engine_info = engine_info->next;
221
348
}
222
349
if(engine_info == NULL){
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
350
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
351
tempdir);
224
352
return false;
225
353
}
226
354
227
355
/* Create new GPGME "context" */
228
356
rc = gpgme_new(&(mc->ctx));
229
357
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
gpgme_strerror(rc));
232
361
return false;
233
362
}
234
363
236
365
return false;
237
366
}
238
367
239
return true;
368
return true;
240
369
}
241
370
242
371
/*
243
372
* Decrypt OpenPGP data.
244
373
* Returns -1 on error
245
374
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
375
__attribute__((nonnull, warn_unused_result))
376
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
377
size_t crypto_size,
249
char **plaintext){
378
char **plaintext,
379
mandos_context *mc){
250
380
gpgme_data_t dh_crypto, dh_plain;
251
381
gpgme_error_t rc;
252
382
ssize_t ret;
254
384
ssize_t plaintext_length = 0;
255
385
256
386
if(debug){
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
258
388
}
259
389
260
390
/* Create new GPGME data buffer from memory cryptotext */
261
391
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
262
392
0);
263
393
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
266
396
return -1;
267
397
}
268
398
269
399
/* Create new empty GPGME data buffer for the plaintext */
270
400
rc = gpgme_data_new(&dh_plain);
271
401
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
274
405
gpgme_data_release(dh_crypto);
275
406
return -1;
276
407
}
279
410
data buffer */
280
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
281
412
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
284
415
plaintext_length = -1;
285
416
if(debug){
286
417
gpgme_decrypt_result_t result;
287
418
result = gpgme_op_decrypt_result(mc->ctx);
288
419
if(result == NULL){
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
290
421
} else {
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
295
426
if(result->file_name != NULL){
296
fprintf(stderr, "File name: %s\n", result->file_name);
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
297
428
}
298
429
gpgme_recipient_t recipient;
299
430
recipient = result->recipients;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
431
while(recipient != NULL){
432
fprintf_plus(stderr, "Public key algorithm: %s\n",
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
435
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
436
fprintf_plus(stderr, "Secret key available: %s\n",
437
recipient->status == GPG_ERR_NO_SECKEY
438
? "No" : "Yes");
439
recipient = recipient->next;
310
440
}
311
441
}
312
442
}
314
444
}
315
445
316
446
if(debug){
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
447
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
318
448
}
319
449
320
450
/* Seek back to the beginning of the GPGME plaintext data buffer */
321
451
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
322
perror("gpgme_data_seek");
452
perror_plus("gpgme_data_seek");
323
453
plaintext_length = -1;
324
454
goto decrypt_end;
325
455
}
326
456
327
457
*plaintext = NULL;
328
458
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
459
plaintext_capacity = incbuffer(plaintext,
460
(size_t)plaintext_length,
461
plaintext_capacity);
332
462
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
463
perror_plus("incbuffer");
464
plaintext_length = -1;
465
goto decrypt_end;
336
466
}
337
467
338
468
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
343
473
break;
344
474
}
345
475
if(ret < 0){
346
perror("gpgme_data_read");
476
perror_plus("gpgme_data_read");
347
477
plaintext_length = -1;
348
478
goto decrypt_end;
349
479
}
351
481
}
352
482
353
483
if(debug){
354
fprintf(stderr, "Decrypted password is: ");
484
fprintf_plus(stderr, "Decrypted password is: ");
355
485
for(ssize_t i = 0; i < plaintext_length; i++){
356
486
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
357
487
}
368
498
return plaintext_length;
369
499
}
370
500
371
static const char * safer_gnutls_strerror(int value){
372
const char *ret = gnutls_strerror(value); /* Spurious warning from
373
-Wunreachable-code */
374
if(ret == NULL)
375
ret = "(unknown)";
376
return ret;
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
377
512
}
378
513
379
514
/* GnuTLS log function callback */
515
__attribute__((nonnull))
380
516
static void debuggnutls(__attribute__((unused)) int level,
381
517
const char* string){
382
fprintf(stderr, "GnuTLS: %s", string);
518
fprintf_plus(stderr, "GnuTLS: %s", string);
383
519
}
384
520
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
387
const char *seckeyfilename){
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
522
static int init_gnutls_global(const char *pubkeyfilename,
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
388
526
int ret;
527
unsigned int uret;
389
528
390
529
if(debug){
391
fprintf(stderr, "Initializing GnuTLS\n");
392
}
393
394
ret = gnutls_global_init();
395
if(ret != GNUTLS_E_SUCCESS){
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
398
return -1;
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
399
531
}
400
532
401
533
if(debug){
407
539
}
408
540
409
541
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
411
543
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
417
gnutls_global_deinit();
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
418
546
return -1;
419
547
}
420
548
421
549
if(debug){
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
552
pubkeyfilename,
553
seckeyfilename);
425
554
}
426
555
427
556
ret = gnutls_certificate_set_openpgp_key_file
428
557
(mc->cred, pubkeyfilename, seckeyfilename,
429
558
GNUTLS_OPENPGP_FMT_BASE64);
430
559
if(ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
560
fprintf_plus(stderr,
561
"Error[%d] while reading the OpenPGP key pair ('%s',"
562
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
564
safer_gnutls_strerror(ret));
436
565
goto globalfail;
437
566
}
438
567
439
568
/* GnuTLS server initialization */
440
569
ret = gnutls_dh_params_init(&mc->dh_params);
441
570
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
444
goto globalfail;
445
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
447
if(ret != GNUTLS_E_SUCCESS){
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
450
goto globalfail;
451
}
452
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
" initialization: %s\n",
573
safer_gnutls_strerror(ret));
574
goto globalfail;
575
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
} while(false);
630
}
631
if(dhparamsfilename == NULL){
632
if(mc->dh_bits == 0){
633
/* Find out the optimal number of DH bits */
634
/* Try to read the private key file */
635
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
636
do {
637
int secfile = open(seckeyfilename, O_RDONLY);
638
if(secfile == -1){
639
perror_plus("open");
640
break;
641
}
642
size_t buffer_capacity = 0;
643
while(true){
644
buffer_capacity = incbuffer((char **)&buffer.data,
645
(size_t)buffer.size,
646
(size_t)buffer_capacity);
647
if(buffer_capacity == 0){
648
perror_plus("incbuffer");
649
free(buffer.data);
650
buffer.data = NULL;
651
break;
652
}
653
ssize_t bytes_read = read(secfile,
654
buffer.data + buffer.size,
655
BUFFER_SIZE);
656
/* EOF */
657
if(bytes_read == 0){
658
break;
659
}
660
/* check bytes_read for failure */
661
if(bytes_read < 0){
662
perror_plus("read");
663
free(buffer.data);
664
buffer.data = NULL;
665
break;
666
}
667
buffer.size += (unsigned int)bytes_read;
668
}
669
close(secfile);
670
} while(false);
671
/* If successful, use buffer to parse private key */
672
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
673
if(buffer.data != NULL){
674
{
675
gnutls_openpgp_privkey_t privkey = NULL;
676
ret = gnutls_openpgp_privkey_init(&privkey);
677
if(ret != GNUTLS_E_SUCCESS){
678
fprintf_plus(stderr, "Error initializing OpenPGP key"
679
" structure: %s",
680
safer_gnutls_strerror(ret));
681
free(buffer.data);
682
buffer.data = NULL;
683
} else {
684
ret = gnutls_openpgp_privkey_import
685
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
686
if(ret != GNUTLS_E_SUCCESS){
687
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
688
safer_gnutls_strerror(ret));
689
privkey = NULL;
690
}
691
free(buffer.data);
692
buffer.data = NULL;
693
if(privkey != NULL){
694
/* Use private key to suggest an appropriate
695
sec_param */
696
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
697
gnutls_openpgp_privkey_deinit(privkey);
698
if(debug){
699
fprintf_plus(stderr, "This OpenPGP key implies using"
700
" a GnuTLS security parameter \"%s\".\n",
701
safe_string(gnutls_sec_param_get_name
702
(sec_param)));
703
}
704
}
705
}
706
}
707
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
708
/* Err on the side of caution */
709
sec_param = GNUTLS_SEC_PARAM_ULTRA;
710
if(debug){
711
fprintf_plus(stderr, "Falling back to security parameter"
712
" \"%s\"\n",
713
safe_string(gnutls_sec_param_get_name
714
(sec_param)));
715
}
716
}
717
}
718
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
719
if(uret != 0){
720
mc->dh_bits = uret;
721
if(debug){
722
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
723
" implies %u DH bits; using that.\n",
724
safe_string(gnutls_sec_param_get_name
725
(sec_param)),
726
mc->dh_bits);
727
}
728
} else {
729
fprintf_plus(stderr, "Failed to get implied number of DH"
730
" bits for security parameter \"%s\"): %s\n",
731
safe_string(gnutls_sec_param_get_name
732
(sec_param)),
733
safer_gnutls_strerror(ret));
734
goto globalfail;
735
}
736
} else if(debug){
737
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
738
mc->dh_bits);
739
}
740
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
743
" bits): %s\n", mc->dh_bits,
744
safer_gnutls_strerror(ret));
745
goto globalfail;
746
}
747
}
453
748
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
454
749
455
750
return 0;
457
752
globalfail:
458
753
459
754
gnutls_certificate_free_credentials(mc->cred);
460
gnutls_global_deinit();
461
755
gnutls_dh_params_deinit(mc->dh_params);
462
756
return -1;
463
757
}
464
758
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
759
__attribute__((nonnull, warn_unused_result))
760
static int init_gnutls_session(gnutls_session_t *session,
761
mandos_context *mc){
467
762
int ret;
468
763
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
764
do {
765
ret = gnutls_init(session, GNUTLS_SERVER);
766
if(quit_now){
767
return -1;
768
}
769
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
770
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
771
fprintf_plus(stderr,
772
"Error in GnuTLS session initialization: %s\n",
773
safer_gnutls_strerror(ret));
473
774
}
474
775
475
776
{
476
777
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
778
do {
779
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
780
if(quit_now){
781
gnutls_deinit(*session);
782
return -1;
783
}
784
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
785
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
786
fprintf_plus(stderr, "Syntax error at: %s\n", err);
787
fprintf_plus(stderr, "GnuTLS error: %s\n",
788
safer_gnutls_strerror(ret));
482
789
gnutls_deinit(*session);
483
790
return -1;
484
791
}
485
792
}
486
793
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
794
do {
795
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
796
mc->cred);
797
if(quit_now){
798
gnutls_deinit(*session);
799
return -1;
800
}
801
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
489
802
if(ret != GNUTLS_E_SUCCESS){
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
803
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
804
safer_gnutls_strerror(ret));
492
805
gnutls_deinit(*session);
493
806
return -1;
494
807
}
495
808
496
809
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
499
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
810
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
501
811
502
812
return 0;
503
813
}
506
816
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
507
817
__attribute__((unused)) const char *txt){}
508
818
819
/* Set effective uid to 0, return errno */
820
__attribute__((warn_unused_result))
821
int raise_privileges(void){
822
int old_errno = errno;
823
int ret = 0;
824
if(seteuid(0) == -1){
825
ret = errno;
826
}
827
errno = old_errno;
828
return ret;
829
}
830
831
/* Set effective and real user ID to 0. Return errno. */
832
__attribute__((warn_unused_result))
833
int raise_privileges_permanently(void){
834
int old_errno = errno;
835
int ret = raise_privileges();
836
if(ret != 0){
837
errno = old_errno;
838
return ret;
839
}
840
if(setuid(0) == -1){
841
ret = errno;
842
}
843
errno = old_errno;
844
return ret;
845
}
846
847
/* Set effective user ID to unprivileged saved user ID */
848
__attribute__((warn_unused_result))
849
int lower_privileges(void){
850
int old_errno = errno;
851
int ret = 0;
852
if(seteuid(uid) == -1){
853
ret = errno;
854
}
855
errno = old_errno;
856
return ret;
857
}
858
859
/* Lower privileges permanently */
860
__attribute__((warn_unused_result))
861
int lower_privileges_permanently(void){
862
int old_errno = errno;
863
int ret = 0;
864
if(setuid(uid) == -1){
865
ret = errno;
866
}
867
errno = old_errno;
868
return ret;
869
}
870
871
/* Helper function to add_local_route() and delete_local_route() */
872
__attribute__((nonnull, warn_unused_result))
873
static bool add_delete_local_route(const bool add,
874
const char *address,
875
AvahiIfIndex if_index){
876
int ret;
877
char helper[] = "mandos-client-iprouteadddel";
878
char add_arg[] = "add";
879
char delete_arg[] = "delete";
880
char debug_flag[] = "--debug";
881
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
882
if(pluginhelperdir == NULL){
883
if(debug){
884
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
885
" variable not set; cannot run helper\n");
886
}
887
return false;
888
}
889
890
char interface[IF_NAMESIZE];
891
if(if_indextoname((unsigned int)if_index, interface) == NULL){
892
perror_plus("if_indextoname");
893
return false;
894
}
895
896
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
if(devnull == -1){
898
perror_plus("open(\"/dev/null\", O_RDONLY)");
899
return false;
900
}
901
pid_t pid = fork();
902
if(pid == 0){
903
/* Child */
904
/* Raise privileges */
905
errno = raise_privileges_permanently();
906
if(errno != 0){
907
perror_plus("Failed to raise privileges");
908
/* _exit(EX_NOPERM); */
909
} else {
910
/* Set group */
911
errno = 0;
912
ret = setgid(0);
913
if(ret == -1){
914
perror_plus("setgid");
915
_exit(EX_NOPERM);
916
}
917
/* Reset supplementary groups */
918
errno = 0;
919
ret = setgroups(0, NULL);
920
if(ret == -1){
921
perror_plus("setgroups");
922
_exit(EX_NOPERM);
923
}
924
}
925
ret = dup2(devnull, STDIN_FILENO);
926
if(ret == -1){
927
perror_plus("dup2(devnull, STDIN_FILENO)");
928
_exit(EX_OSERR);
929
}
930
ret = close(devnull);
931
if(ret == -1){
932
perror_plus("close");
933
_exit(EX_OSERR);
934
}
935
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
if(ret == -1){
937
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
938
_exit(EX_OSERR);
939
}
940
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
941
O_RDONLY
942
| O_DIRECTORY
943
| O_PATH
944
| O_CLOEXEC));
945
if(helperdir_fd == -1){
946
perror_plus("open");
947
_exit(EX_UNAVAILABLE);
948
}
949
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
950
helper, O_RDONLY));
951
if(helper_fd == -1){
952
perror_plus("openat");
953
close(helperdir_fd);
954
_exit(EX_UNAVAILABLE);
955
}
956
close(helperdir_fd);
957
#ifdef __GNUC__
958
#pragma GCC diagnostic push
959
#pragma GCC diagnostic ignored "-Wcast-qual"
960
#endif
961
if(fexecve(helper_fd, (char *const [])
962
{ helper, add ? add_arg : delete_arg, (char *)address,
963
interface, debug ? debug_flag : NULL, NULL },
964
environ) == -1){
965
#ifdef __GNUC__
966
#pragma GCC diagnostic pop
967
#endif
968
perror_plus("fexecve");
969
_exit(EXIT_FAILURE);
970
}
971
}
972
if(pid == -1){
973
perror_plus("fork");
974
return false;
975
}
976
int status;
977
pid_t pret = -1;
978
errno = 0;
979
do {
980
pret = waitpid(pid, &status, 0);
981
if(pret == -1 and errno == EINTR and quit_now){
982
int errno_raising = 0;
983
if((errno = raise_privileges()) != 0){
984
errno_raising = errno;
985
perror_plus("Failed to raise privileges in order to"
986
" kill helper program");
987
}
988
if(kill(pid, SIGTERM) == -1){
989
perror_plus("kill");
990
}
991
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
992
perror_plus("Failed to lower privileges after killing"
993
" helper program");
994
}
995
return false;
996
}
997
} while(pret == -1 and errno == EINTR);
998
if(pret == -1){
999
perror_plus("waitpid");
1000
return false;
1001
}
1002
if(WIFEXITED(status)){
1003
if(WEXITSTATUS(status) != 0){
1004
fprintf_plus(stderr, "Error: iprouteadddel exited"
1005
" with status %d\n", WEXITSTATUS(status));
1006
return false;
1007
}
1008
return true;
1009
}
1010
if(WIFSIGNALED(status)){
1011
fprintf_plus(stderr, "Error: iprouteadddel died by"
1012
" signal %d\n", WTERMSIG(status));
1013
return false;
1014
}
1015
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1016
return false;
1017
}
1018
1019
__attribute__((nonnull, warn_unused_result))
1020
static bool add_local_route(const char *address,
1021
AvahiIfIndex if_index){
1022
if(debug){
1023
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
}
1025
return add_delete_local_route(true, address, if_index);
1026
}
1027
1028
__attribute__((nonnull, warn_unused_result))
1029
static bool delete_local_route(const char *address,
1030
AvahiIfIndex if_index){
1031
if(debug){
1032
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
}
1034
return add_delete_local_route(false, address, if_index);
1035
}
1036
509
1037
/* Called when a Mandos server is found */
510
static int start_mandos_communication(const char *ip, uint16_t port,
1038
__attribute__((nonnull, warn_unused_result))
1039
static int start_mandos_communication(const char *ip, in_port_t port,
511
1040
AvahiIfIndex if_index,
512
mandos_context *mc){
513
int ret, tcp_sd;
1041
int af, mandos_context *mc){
1042
int ret, tcp_sd = -1;
514
1043
ssize_t sret;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1044
struct sockaddr_storage to;
516
1045
char *buffer = NULL;
517
char *decrypted_buffer;
1046
char *decrypted_buffer = NULL;
518
1047
size_t buffer_length = 0;
519
1048
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
521
1049
size_t written;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
1050
int retval = -1;
524
1051
gnutls_session_t session;
525
526
ret = init_gnutls_session(mc, &session);
1052
int pf; /* Protocol family */
1053
bool route_added = false;
1054
1055
errno = 0;
1056
1057
if(quit_now){
1058
errno = EINTR;
1059
return -1;
1060
}
1061
1062
switch(af){
1063
case AF_INET6:
1064
pf = PF_INET6;
1065
break;
1066
case AF_INET:
1067
pf = PF_INET;
1068
break;
1069
default:
1070
fprintf_plus(stderr, "Bad address family: %d\n", af);
1071
errno = EINVAL;
1072
return -1;
1073
}
1074
1075
/* If the interface is specified and we have a list of interfaces */
1076
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1077
/* Check if the interface is one of the interfaces we are using */
1078
bool match = false;
1079
{
1080
char *interface = NULL;
1081
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1082
interface))){
1083
if(if_nametoindex(interface) == (unsigned int)if_index){
1084
match = true;
1085
break;
1086
}
1087
}
1088
}
1089
if(not match){
1090
/* This interface does not match any in the list, so we don't
1091
connect to the server */
1092
if(debug){
1093
char interface[IF_NAMESIZE];
1094
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1095
perror_plus("if_indextoname");
1096
} else {
1097
fprintf_plus(stderr, "Skipping server on non-used interface"
1098
" \"%s\"\n",
1099
if_indextoname((unsigned int)if_index,
1100
interface));
1101
}
1102
}
1103
return -1;
1104
}
1105
}
1106
1107
ret = init_gnutls_session(&session, mc);
527
1108
if(ret != 0){
528
1109
return -1;
529
1110
}
530
1111
531
1112
if(debug){
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
533
"\n", ip, port);
1113
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1114
PRIuMAX "\n", ip, (uintmax_t)port);
534
1115
}
535
1116
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
1117
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
537
1118
if(tcp_sd < 0){
538
perror("socket");
539
return -1;
540
}
541
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
548
}
549
550
memset(&to, 0, sizeof(to));
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1119
int e = errno;
1120
perror_plus("socket");
1121
errno = e;
1122
goto mandos_end;
1123
}
1124
1125
if(quit_now){
1126
errno = EINTR;
1127
goto mandos_end;
1128
}
1129
1130
if(af == AF_INET6){
1131
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1132
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1133
ret = inet_pton(af, ip, &to6->sin6_addr);
1134
} else { /* IPv4 */
1135
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1136
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to4->sin_addr);
1138
}
555
1139
if(ret < 0 ){
556
perror("inet_pton");
557
return -1;
1140
int e = errno;
1141
perror_plus("inet_pton");
1142
errno = e;
1143
goto mandos_end;
558
1144
}
559
1145
if(ret == 0){
560
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
562
}
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
564
-Wconversion and
565
-Wunreachable-code */
1146
int e = errno;
1147
fprintf_plus(stderr, "Bad address: %s\n", ip);
1148
errno = e;
1149
goto mandos_end;
1150
}
1151
if(af == AF_INET6){
1152
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1153
if(IN6_IS_ADDR_LINKLOCAL
1154
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1155
if(if_index == AVAHI_IF_UNSPEC){
1156
fprintf_plus(stderr, "An IPv6 link-local address is"
1157
" incomplete without a network interface\n");
1158
errno = EINVAL;
1159
goto mandos_end;
1160
}
1161
/* Set the network interface number as scope */
1162
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1163
}
1164
} else {
1165
((struct sockaddr_in *)&to)->sin_port = htons(port);
1166
}
566
1167
567
to.in6.sin6_scope_id = (uint32_t)if_index;
1168
if(quit_now){
1169
errno = EINTR;
1170
goto mandos_end;
1171
}
568
1172
569
1173
if(debug){
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
575
perror("inet_ntop");
576
} else {
577
if(strcmp(addrstr, ip) != 0){
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
579
}
580
}
581
}
582
583
ret = connect(tcp_sd, &to.in, sizeof(to));
584
if(ret < 0){
585
perror("connect");
586
return -1;
1174
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1175
char interface[IF_NAMESIZE];
1176
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1177
perror_plus("if_indextoname");
1178
} else {
1179
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1180
"\n", ip, interface, (uintmax_t)port);
1181
}
1182
} else {
1183
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1184
ip, (uintmax_t)port);
1185
}
1186
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1187
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1188
if(af == AF_INET6){
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in6),
1191
addrstr, sizeof(addrstr), NULL, 0,
1192
NI_NUMERICHOST);
1193
} else {
1194
ret = getnameinfo((struct sockaddr *)&to,
1195
sizeof(struct sockaddr_in),
1196
addrstr, sizeof(addrstr), NULL, 0,
1197
NI_NUMERICHOST);
1198
}
1199
if(ret == EAI_SYSTEM){
1200
perror_plus("getnameinfo");
1201
} else if(ret != 0) {
1202
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1203
} else if(strcmp(addrstr, ip) != 0){
1204
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1205
}
1206
}
1207
1208
if(quit_now){
1209
errno = EINTR;
1210
goto mandos_end;
1211
}
1212
1213
while(true){
1214
if(af == AF_INET6){
1215
ret = connect(tcp_sd, (struct sockaddr *)&to,
1216
sizeof(struct sockaddr_in6));
1217
} else {
1218
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1219
sizeof(struct sockaddr_in));
1220
}
1221
if(ret < 0){
1222
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1223
and if_index != AVAHI_IF_UNSPEC
1224
and connect_to == NULL
1225
and not route_added and
1226
((af == AF_INET6 and not
1227
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
&to)->sin6_addr)))
1229
or (af == AF_INET and
1230
/* Not a a IPv4LL address */
1231
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1232
& 0xFFFF0000L) != 0xA9FE0000L))){
1233
/* Work around Avahi bug - Avahi does not announce link-local
1234
addresses if it has a global address, so local hosts with
1235
*only* a link-local address (e.g. Mandos clients) cannot
1236
connect to a Mandos server announced by Avahi on a server
1237
host with a global address. Work around this by retrying
1238
with an explicit route added with the server's address.
1239
1240
Avahi bug reference:
1241
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1242
https://bugs.debian.org/587961
1243
*/
1244
if(debug){
1245
fprintf_plus(stderr, "Mandos server unreachable, trying"
1246
" direct route\n");
1247
}
1248
int e = errno;
1249
route_added = add_local_route(ip, if_index);
1250
if(route_added){
1251
continue;
1252
}
1253
errno = e;
1254
}
1255
if(errno != ECONNREFUSED or debug){
1256
int e = errno;
1257
perror_plus("connect");
1258
errno = e;
1259
}
1260
goto mandos_end;
1261
}
1262
1263
if(quit_now){
1264
errno = EINTR;
1265
goto mandos_end;
1266
}
1267
break;
587
1268
}
588
1269
589
1270
const char *out = mandos_protocol_version;
591
1272
while(true){
592
1273
size_t out_size = strlen(out);
593
1274
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
594
out_size - written));
1275
out_size - written));
595
1276
if(ret == -1){
596
perror("write");
597
retval = -1;
1277
int e = errno;
1278
perror_plus("write");
1279
errno = e;
598
1280
goto mandos_end;
599
1281
}
600
1282
written += (size_t)ret;
608
1290
break;
609
1291
}
610
1292
}
1293
1294
if(quit_now){
1295
errno = EINTR;
1296
goto mandos_end;
1297
}
611
1298
}
612
1299
613
1300
if(debug){
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
}
616
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
618
619
do{
1301
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1302
}
1303
1304
if(quit_now){
1305
errno = EINTR;
1306
goto mandos_end;
1307
}
1308
1309
/* This casting via intptr_t is to eliminate warning about casting
1310
an int to a pointer type. This is exactly how the GnuTLS Guile
1311
function "set-session-transport-fd!" does it. */
1312
gnutls_transport_set_ptr(session,
1313
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1314
1315
if(quit_now){
1316
errno = EINTR;
1317
goto mandos_end;
1318
}
1319
1320
do {
620
1321
ret = gnutls_handshake(session);
1322
if(quit_now){
1323
errno = EINTR;
1324
goto mandos_end;
1325
}
621
1326
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
622
1327
623
1328
if(ret != GNUTLS_E_SUCCESS){
624
1329
if(debug){
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1330
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
626
1331
gnutls_perror(ret);
627
1332
}
628
retval = -1;
1333
errno = EPROTO;
629
1334
goto mandos_end;
630
1335
}
631
1336
632
1337
/* Read OpenPGP packet that contains the wanted password */
633
1338
634
1339
if(debug){
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
636
ip);
1340
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1341
" %s\n", ip);
637
1342
}
638
1343
639
1344
while(true){
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
641
buffer_capacity);
1345
1346
if(quit_now){
1347
errno = EINTR;
1348
goto mandos_end;
1349
}
1350
1351
buffer_capacity = incbuffer(&buffer, buffer_length,
1352
buffer_capacity);
642
1353
if(buffer_capacity == 0){
643
perror("adjustbuffer");
644
retval = -1;
1354
int e = errno;
1355
perror_plus("incbuffer");
1356
errno = e;
1357
goto mandos_end;
1358
}
1359
1360
if(quit_now){
1361
errno = EINTR;
645
1362
goto mandos_end;
646
1363
}
647
1364
656
1373
case GNUTLS_E_AGAIN:
657
1374
break;
658
1375
case GNUTLS_E_REHANDSHAKE:
659
do{
1376
do {
660
1377
ret = gnutls_handshake(session);
1378
1379
if(quit_now){
1380
errno = EINTR;
1381
goto mandos_end;
1382
}
661
1383
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
662
1384
if(ret < 0){
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1385
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1386
"***\n");
664
1387
gnutls_perror(ret);
665
retval = -1;
1388
errno = EPROTO;
666
1389
goto mandos_end;
667
1390
}
668
1391
break;
669
1392
default:
670
fprintf(stderr, "Unknown error while reading data from"
671
" encrypted session with Mandos server\n");
672
retval = -1;
1393
fprintf_plus(stderr, "Unknown error while reading data from"
1394
" encrypted session with Mandos server\n");
673
1395
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1396
errno = EIO;
674
1397
goto mandos_end;
675
1398
}
676
1399
} else {
679
1402
}
680
1403
681
1404
if(debug){
682
fprintf(stderr, "Closing TLS session\n");
683
}
684
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1405
fprintf_plus(stderr, "Closing TLS session\n");
1406
}
1407
1408
if(quit_now){
1409
errno = EINTR;
1410
goto mandos_end;
1411
}
1412
1413
do {
1414
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1415
if(quit_now){
1416
errno = EINTR;
1417
goto mandos_end;
1418
}
1419
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
686
1420
687
1421
if(buffer_length > 0){
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
689
buffer_length,
690
&decrypted_buffer);
1422
ssize_t decrypted_buffer_size;
1423
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1424
&decrypted_buffer, mc);
691
1425
if(decrypted_buffer_size >= 0){
1426
1427
clearerr(stdout);
692
1428
written = 0;
693
1429
while(written < (size_t) decrypted_buffer_size){
1430
if(quit_now){
1431
errno = EINTR;
1432
goto mandos_end;
1433
}
1434
694
1435
ret = (int)fwrite(decrypted_buffer + written, 1,
695
1436
(size_t)decrypted_buffer_size - written,
696
1437
stdout);
697
1438
if(ret == 0 and ferror(stdout)){
1439
int e = errno;
698
1440
if(debug){
699
fprintf(stderr, "Error writing encrypted data: %s\n",
700
strerror(errno));
1441
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1442
strerror(errno));
701
1443
}
702
retval = -1;
703
break;
1444
errno = e;
1445
goto mandos_end;
704
1446
}
705
1447
written += (size_t)ret;
706
1448
}
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
1449
ret = fflush(stdout);
1450
if(ret != 0){
1451
int e = errno;
1452
if(debug){
1453
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1454
strerror(errno));
1455
}
1456
errno = e;
1457
goto mandos_end;
1458
}
1459
retval = 0;
710
1460
}
711
} else {
712
retval = -1;
713
1461
}
714
1462
715
1463
/* Shutdown procedure */
716
1464
717
1465
mandos_end:
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
1466
{
1467
if(route_added){
1468
if(not delete_local_route(ip, if_index)){
1469
fprintf_plus(stderr, "Failed to delete local route to %s on"
1470
" interface %d", ip, if_index);
1471
}
1472
}
1473
int e = errno;
1474
free(decrypted_buffer);
1475
free(buffer);
1476
if(tcp_sd >= 0){
1477
ret = close(tcp_sd);
1478
}
1479
if(ret == -1){
1480
if(e == 0){
1481
e = errno;
1482
}
1483
perror_plus("close");
1484
}
1485
gnutls_deinit(session);
1486
errno = e;
1487
if(quit_now){
1488
errno = EINTR;
1489
retval = -1;
1490
}
722
1491
}
723
gnutls_deinit(session);
724
1492
return retval;
725
1493
}
726
1494
1495
__attribute__((nonnull))
727
1496
static void resolve_callback(AvahiSServiceResolver *r,
728
1497
AvahiIfIndex interface,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1498
AvahiProtocol proto,
730
1499
AvahiResolverEvent event,
731
1500
const char *name,
732
1501
const char *type,
737
1506
AVAHI_GCC_UNUSED AvahiStringList *txt,
738
1507
AVAHI_GCC_UNUSED AvahiLookupResultFlags
739
1508
flags,
740
void* userdata){
741
mandos_context *mc = userdata;
742
assert(r);
1509
void *mc){
1510
if(r == NULL){
1511
return;
1512
}
743
1513
744
1514
/* Called whenever a service has been resolved successfully or
745
1515
timed out */
746
1516
1517
if(quit_now){
1518
avahi_s_service_resolver_free(r);
1519
return;
1520
}
1521
747
1522
switch(event){
748
1523
default:
749
1524
case AVAHI_RESOLVER_FAILURE:
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
752
avahi_strerror(avahi_server_errno(mc->server)));
1525
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1526
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1527
domain,
1528
avahi_strerror(avahi_server_errno
1529
(((mandos_context*)mc)->server)));
753
1530
break;
754
1531
755
1532
case AVAHI_RESOLVER_FOUND:
757
1534
char ip[AVAHI_ADDRESS_STR_MAX];
758
1535
avahi_address_snprint(ip, sizeof(ip), address);
759
1536
if(debug){
760
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
ip, (intmax_t)interface, port);
1537
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1538
PRIdMAX ") on port %" PRIu16 "\n", name,
1539
host_name, ip, (intmax_t)interface, port);
763
1540
}
764
int ret = start_mandos_communication(ip, port, interface, mc);
1541
int ret = start_mandos_communication(ip, (in_port_t)port,
1542
interface,
1543
avahi_proto_to_af(proto),
1544
mc);
765
1545
if(ret == 0){
766
avahi_simple_poll_quit(mc->simple_poll);
1546
avahi_simple_poll_quit(simple_poll);
1547
} else {
1548
if(not add_server(ip, (in_port_t)port, interface,
1549
avahi_proto_to_af(proto),
1550
&((mandos_context*)mc)->current_server)){
1551
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1552
" list\n", name);
1553
}
767
1554
}
768
1555
}
769
1556
}
779
1566
const char *domain,
780
1567
AVAHI_GCC_UNUSED AvahiLookupResultFlags
781
1568
flags,
782
void* userdata){
783
mandos_context *mc = userdata;
784
assert(b);
1569
void *mc){
1570
if(b == NULL){
1571
return;
1572
}
785
1573
786
1574
/* Called whenever a new services becomes available on the LAN or
787
1575
is removed from the LAN */
788
1576
1577
if(quit_now){
1578
return;
1579
}
1580
789
1581
switch(event){
790
1582
default:
791
1583
case AVAHI_BROWSER_FAILURE:
792
1584
793
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
1585
fprintf_plus(stderr, "(Avahi browser) %s\n",
1586
avahi_strerror(avahi_server_errno
1587
(((mandos_context*)mc)->server)));
1588
avahi_simple_poll_quit(simple_poll);
796
1589
return;
797
1590
798
1591
case AVAHI_BROWSER_NEW:
801
1594
the callback function is called the Avahi server will free the
802
1595
resolver for us. */
803
1596
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
1597
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1598
interface, protocol, name, type,
1599
domain, protocol, 0,
1600
resolve_callback, mc) == NULL)
1601
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1602
" %s\n", name,
1603
avahi_strerror(avahi_server_errno
1604
(((mandos_context*)mc)->server)));
810
1605
break;
811
1606
812
1607
case AVAHI_BROWSER_REMOVE:
815
1610
case AVAHI_BROWSER_ALL_FOR_NOW:
816
1611
case AVAHI_BROWSER_CACHE_EXHAUSTED:
817
1612
if(debug){
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1613
fprintf_plus(stderr, "No Mandos server found, still"
1614
" searching...\n");
819
1615
}
820
1616
break;
821
1617
}
822
1618
}
823
1619
1620
/* Signal handler that stops main loop after SIGTERM */
1621
static void handle_sigterm(int sig){
1622
if(quit_now){
1623
return;
1624
}
1625
quit_now = 1;
1626
signal_received = sig;
1627
int old_errno = errno;
1628
/* set main loop to exit */
1629
if(simple_poll != NULL){
1630
avahi_simple_poll_quit(simple_poll);
1631
}
1632
errno = old_errno;
1633
}
1634
1635
__attribute__((nonnull, warn_unused_result))
1636
bool get_flags(const char *ifname, struct ifreq *ifr){
1637
int ret;
1638
int old_errno;
1639
1640
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1641
if(s < 0){
1642
old_errno = errno;
1643
perror_plus("socket");
1644
errno = old_errno;
1645
return false;
1646
}
1647
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1648
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1649
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1650
if(ret == -1){
1651
if(debug){
1652
old_errno = errno;
1653
perror_plus("ioctl SIOCGIFFLAGS");
1654
errno = old_errno;
1655
}
1656
return false;
1657
}
1658
return true;
1659
}
1660
1661
__attribute__((nonnull, warn_unused_result))
1662
bool good_flags(const char *ifname, const struct ifreq *ifr){
1663
1664
/* Reject the loopback device */
1665
if(ifr->ifr_flags & IFF_LOOPBACK){
1666
if(debug){
1667
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1668
ifname);
1669
}
1670
return false;
1671
}
1672
/* Accept point-to-point devices only if connect_to is specified */
1673
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1674
if(debug){
1675
fprintf_plus(stderr, "Accepting point-to-point interface"
1676
" \"%s\"\n", ifname);
1677
}
1678
return true;
1679
}
1680
/* Otherwise, reject non-broadcast-capable devices */
1681
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1682
if(debug){
1683
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1684
" \"%s\"\n", ifname);
1685
}
1686
return false;
1687
}
1688
/* Reject non-ARP interfaces (including dummy interfaces) */
1689
if(ifr->ifr_flags & IFF_NOARP){
1690
if(debug){
1691
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1692
ifname);
1693
}
1694
return false;
1695
}
1696
1697
/* Accept this device */
1698
if(debug){
1699
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1700
}
1701
return true;
1702
}
1703
1704
/*
1705
* This function determines if a directory entry in /sys/class/net
1706
* corresponds to an acceptable network device.
1707
* (This function is passed to scandir(3) as a filter function.)
1708
*/
1709
__attribute__((nonnull, warn_unused_result))
1710
int good_interface(const struct dirent *if_entry){
1711
if(if_entry->d_name[0] == '.'){
1712
return 0;
1713
}
1714
1715
struct ifreq ifr;
1716
if(not get_flags(if_entry->d_name, &ifr)){
1717
if(debug){
1718
fprintf_plus(stderr, "Failed to get flags for interface "
1719
"\"%s\"\n", if_entry->d_name);
1720
}
1721
return 0;
1722
}
1723
1724
if(not good_flags(if_entry->d_name, &ifr)){
1725
return 0;
1726
}
1727
return 1;
1728
}
1729
1730
/*
1731
* This function determines if a network interface is up.
1732
*/
1733
__attribute__((nonnull, warn_unused_result))
1734
bool interface_is_up(const char *interface){
1735
struct ifreq ifr;
1736
if(not get_flags(interface, &ifr)){
1737
if(debug){
1738
fprintf_plus(stderr, "Failed to get flags for interface "
1739
"\"%s\"\n", interface);
1740
}
1741
return false;
1742
}
1743
1744
return (bool)(ifr.ifr_flags & IFF_UP);
1745
}
1746
1747
/*
1748
* This function determines if a network interface is running
1749
*/
1750
__attribute__((nonnull, warn_unused_result))
1751
bool interface_is_running(const char *interface){
1752
struct ifreq ifr;
1753
if(not get_flags(interface, &ifr)){
1754
if(debug){
1755
fprintf_plus(stderr, "Failed to get flags for interface "
1756
"\"%s\"\n", interface);
1757
}
1758
return false;
1759
}
1760
1761
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1762
}
1763
1764
__attribute__((nonnull, pure, warn_unused_result))
1765
int notdotentries(const struct dirent *direntry){
1766
/* Skip "." and ".." */
1767
if(direntry->d_name[0] == '.'
1768
and (direntry->d_name[1] == '\0'
1769
or (direntry->d_name[1] == '.'
1770
and direntry->d_name[2] == '\0'))){
1771
return 0;
1772
}
1773
return 1;
1774
}
1775
1776
/* Is this directory entry a runnable program? */
1777
__attribute__((nonnull, warn_unused_result))
1778
int runnable_hook(const struct dirent *direntry){
1779
int ret;
1780
size_t sret;
1781
struct stat st;
1782
1783
if((direntry->d_name)[0] == '\0'){
1784
/* Empty name? */
1785
return 0;
1786
}
1787
1788
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1789
"abcdefghijklmnopqrstuvwxyz"
1790
"0123456789"
1791
"_.-");
1792
if((direntry->d_name)[sret] != '\0'){
1793
/* Contains non-allowed characters */
1794
if(debug){
1795
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1796
direntry->d_name);
1797
}
1798
return 0;
1799
}
1800
1801
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1802
if(ret == -1){
1803
if(debug){
1804
perror_plus("Could not stat hook");
1805
}
1806
return 0;
1807
}
1808
if(not (S_ISREG(st.st_mode))){
1809
/* Not a regular file */
1810
if(debug){
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1812
direntry->d_name);
1813
}
1814
return 0;
1815
}
1816
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1817
/* Not executable */
1818
if(debug){
1819
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1820
direntry->d_name);
1821
}
1822
return 0;
1823
}
1824
if(debug){
1825
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1826
direntry->d_name);
1827
}
1828
return 1;
1829
}
1830
1831
__attribute__((nonnull, warn_unused_result))
1832
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1833
mandos_context *mc){
1834
int ret;
1835
struct timespec now;
1836
struct timespec waited_time;
1837
intmax_t block_time;
1838
1839
while(true){
1840
if(mc->current_server == NULL){
1841
if(debug){
1842
fprintf_plus(stderr, "Wait until first server is found."
1843
" No timeout!\n");
1844
}
1845
ret = avahi_simple_poll_iterate(s, -1);
1846
} else {
1847
if(debug){
1848
fprintf_plus(stderr, "Check current_server if we should run"
1849
" it, or wait\n");
1850
}
1851
/* the current time */
1852
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1853
if(ret == -1){
1854
perror_plus("clock_gettime");
1855
return -1;
1856
}
1857
/* Calculating in ms how long time between now and server
1858
who we visted longest time ago. Now - last seen. */
1859
waited_time.tv_sec = (now.tv_sec
1860
- mc->current_server->last_seen.tv_sec);
1861
waited_time.tv_nsec = (now.tv_nsec
1862
- mc->current_server->last_seen.tv_nsec);
1863
/* total time is 10s/10,000ms.
1864
Converting to s from ms by dividing by 1,000,
1865
and ns to ms by dividing by 1,000,000. */
1866
block_time = ((retry_interval
1867
- ((intmax_t)waited_time.tv_sec * 1000))
1868
- ((intmax_t)waited_time.tv_nsec / 1000000));
1869
1870
if(debug){
1871
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1872
block_time);
1873
}
1874
1875
if(block_time <= 0){
1876
ret = start_mandos_communication(mc->current_server->ip,
1877
mc->current_server->port,
1878
mc->current_server->if_index,
1879
mc->current_server->af, mc);
1880
if(ret == 0){
1881
avahi_simple_poll_quit(s);
1882
return 0;
1883
}
1884
ret = clock_gettime(CLOCK_MONOTONIC,
1885
&mc->current_server->last_seen);
1886
if(ret == -1){
1887
perror_plus("clock_gettime");
1888
return -1;
1889
}
1890
mc->current_server = mc->current_server->next;
1891
block_time = 0; /* Call avahi to find new Mandos
1892
servers, but don't block */
1893
}
1894
1895
ret = avahi_simple_poll_iterate(s, (int)block_time);
1896
}
1897
if(ret != 0){
1898
if(ret > 0 or errno != EINTR){
1899
return (ret != 1) ? ret : 0;
1900
}
1901
}
1902
}
1903
}
1904
1905
__attribute__((nonnull))
1906
void run_network_hooks(const char *mode, const char *interface,
1907
const float delay){
1908
struct dirent **direntries = NULL;
1909
if(hookdir_fd == -1){
1910
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1911
| O_CLOEXEC);
1912
if(hookdir_fd == -1){
1913
if(errno == ENOENT){
1914
if(debug){
1915
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1916
" found\n", hookdir);
1917
}
1918
} else {
1919
perror_plus("open");
1920
}
1921
return;
1922
}
1923
}
1924
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1925
runnable_hook, alphasort);
1926
if(numhooks == -1){
1927
perror_plus("scandir");
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1942
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1989
perror_plus("asprintf");
1990
_exit(EX_OSERR);
1991
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1994
free(delaystring);
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if(close(hookdir_fd) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = close(devnull);
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
2063
} else {
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if(close(hookdir_fd) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
2083
}
2084
2085
__attribute__((nonnull, warn_unused_result))
2086
int bring_up_interface(const char *const interface,
2087
const float delay){
2088
int old_errno = errno;
2089
int ret;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2092
if(if_index == 0){
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2094
errno = old_errno;
2095
return ENXIO;
2096
}
2097
2098
if(quit_now){
2099
errno = old_errno;
2100
return EINTR;
2101
}
2102
2103
if(not interface_is_up(interface)){
2104
int ret_errno = 0;
2105
int ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
2107
ret_errno = errno;
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2109
"\"%s\"\n", interface);
2110
errno = old_errno;
2111
return ret_errno;
2112
}
2113
network.ifr_flags |= IFF_UP; /* set flag */
2114
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2116
if(sd == -1){
2117
ret_errno = errno;
2118
perror_plus("socket");
2119
errno = old_errno;
2120
return ret_errno;
2121
}
2122
2123
if(quit_now){
2124
ret = close(sd);
2125
if(ret == -1){
2126
perror_plus("close");
2127
}
2128
errno = old_errno;
2129
return EINTR;
2130
}
2131
2132
if(debug){
2133
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2134
interface);
2135
}
2136
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to raise privileges");
2142
}
2143
2144
#ifdef __linux__
2145
int ret_linux;
2146
bool restore_loglevel = false;
2147
if(ret_errno == 0){
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2153
} else {
2154
restore_loglevel = true;
2155
}
2156
}
2157
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
2160
#ifdef __linux__
2161
if(restore_loglevel){
2162
ret_linux = klogctl(7, NULL, 0);
2163
if(ret_linux == -1){
2164
perror_plus("klogctl");
2165
}
2166
}
2167
#endif /* __linux__ */
2168
2169
/* If raise_privileges() succeeded above */
2170
if(ret_errno == 0){
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("Failed to lower privileges");
2176
}
2177
}
2178
2179
/* Close the socket */
2180
ret = close(sd);
2181
if(ret == -1){
2182
perror_plus("close");
2183
}
2184
2185
if(ret_setflags == -1){
2186
errno = ioctl_errno;
2187
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2188
errno = old_errno;
2189
return ioctl_errno;
2190
}
2191
} else if(debug){
2192
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2193
interface);
2194
}
2195
2196
/* Sleep checking until interface is running.
2197
Check every 0.25s, up to total time of delay */
2198
for(int i=0; i < delay * 4; i++){
2199
if(interface_is_running(interface)){
2200
break;
2201
}
2202
struct timespec sleeptime = { .tv_nsec = 250000000 };
2203
ret = nanosleep(&sleeptime, NULL);
2204
if(ret == -1 and errno != EINTR){
2205
perror_plus("nanosleep");
2206
}
2207
}
2208
2209
errno = old_errno;
2210
return 0;
2211
}
2212
2213
__attribute__((nonnull, warn_unused_result))
2214
int take_down_interface(const char *const interface){
2215
int old_errno = errno;
2216
struct ifreq network;
2217
unsigned int if_index = if_nametoindex(interface);
2218
if(if_index == 0){
2219
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2220
errno = old_errno;
2221
return ENXIO;
2222
}
2223
if(interface_is_up(interface)){
2224
int ret_errno = 0;
2225
int ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2227
ret_errno = errno;
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
return ret_errno;
2232
}
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
2237
ret_errno = errno;
2238
perror_plus("socket");
2239
errno = old_errno;
2240
return ret_errno;
2241
}
2242
2243
if(debug){
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2245
interface);
2246
}
2247
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
2254
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
int ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2282
interface);
2283
}
2284
2285
errno = old_errno;
2286
return 0;
2287
}
2288
824
2289
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
825
2295
AvahiSServiceBrowser *sb = NULL;
826
int error;
2296
error_t ret_errno;
827
2297
int ret;
828
2298
intmax_t tmpmax;
829
int numchars;
2299
char *tmp;
830
2300
int exitcode = EXIT_SUCCESS;
831
const char *interface = "eth0";
832
struct ifreq network;
833
int sd;
834
uid_t uid;
835
gid_t gid;
836
char *connect_to = NULL;
837
char tempdir[] = "/tmp/mandosXXXXXX";
838
bool tempdir_created = false;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
839
2306
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
840
2307
const char *seckey = PATHDIR "/" SECKEY;
841
2308
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
842
2311
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
846
2312
bool gnutls_initialized = false;
847
2313
bool gpgme_initialized = false;
848
double delay = 2.5;
2314
float delay = 2.5f;
2315
double retry_interval = 10; /* 10s between trying a server and
2316
retrying the same server again */
2317
2318
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2319
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2320
2321
uid = getuid();
2322
gid = getgid();
2323
2324
/* Lower any group privileges we might have, just to be safe */
2325
errno = 0;
2326
ret = setgid(gid);
2327
if(ret == -1){
2328
perror_plus("setgid");
2329
}
2330
2331
/* Lower user privileges (temporarily) */
2332
errno = 0;
2333
ret = seteuid(uid);
2334
if(ret == -1){
2335
perror_plus("seteuid");
2336
}
2337
2338
if(quit_now){
2339
goto end;
2340
}
849
2341
850
2342
{
851
2343
struct argp_option options[] = {
857
2349
.group = 1 },
858
2350
{ .name = "interface", .key = 'i',
859
2351
.arg = "NAME",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
2352
.doc = "Network interface that will be used to search for"
2353
" Mandos servers",
862
2354
.group = 1 },
863
2355
{ .name = "seckey", .key = 's',
864
2356
.arg = "FILE",
873
2365
.doc = "Bit length of the prime number used in the"
874
2366
" Diffie-Hellman key exchange",
875
2367
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
876
2373
{ .name = "priority", .key = 130,
877
2374
.arg = "STRING",
878
2375
.doc = "GnuTLS priority string for the TLS handshake",
881
2378
.arg = "SECONDS",
882
2379
.doc = "Maximum delay to wait for interface startup",
883
2380
.group = 2 },
2381
{ .name = "retry", .key = 132,
2382
.arg = "SECONDS",
2383
.doc = "Retry interval used when denied by the Mandos server",
2384
.group = 2 },
2385
{ .name = "network-hook-dir", .key = 133,
2386
.arg = "DIR",
2387
.doc = "Directory where network hooks are located",
2388
.group = 2 },
2389
/*
2390
* These reproduce what we would get without ARGP_NO_HELP
2391
*/
2392
{ .name = "help", .key = '?',
2393
.doc = "Give this help list", .group = -1 },
2394
{ .name = "usage", .key = -3,
2395
.doc = "Give a short usage message", .group = -1 },
2396
{ .name = "version", .key = 'V',
2397
.doc = "Print program version", .group = -1 },
884
2398
{ .name = NULL }
885
2399
};
886
2400
887
2401
error_t parse_opt(int key, char *arg,
888
2402
struct argp_state *state){
2403
errno = 0;
889
2404
switch(key){
890
2405
case 128: /* --debug */
891
2406
debug = true;
894
2409
connect_to = arg;
895
2410
break;
896
2411
case 'i': /* --interface */
897
interface = arg;
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
2414
if(ret_errno != 0){
2415
argp_error(state, "%s", strerror(ret_errno));
2416
}
898
2417
break;
899
2418
case 's': /* --seckey */
900
2419
seckey = arg;
903
2422
pubkey = arg;
904
2423
break;
905
2424
case 129: /* --dh-bits */
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
910
exit(EXIT_FAILURE);
2425
errno = 0;
2426
tmpmax = strtoimax(arg, &tmp, 10);
2427
if(errno != 0 or tmp == arg or *tmp != '\0'
2428
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2429
argp_error(state, "Bad number of DH bits");
911
2430
}
912
2431
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
913
2432
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
914
2436
case 130: /* --priority */
915
2437
mc.priority = arg;
916
2438
break;
917
2439
case 131: /* --delay */
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
921
exit(EXIT_FAILURE);
922
}
923
break;
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
2440
errno = 0;
2441
delay = strtof(arg, &tmp);
2442
if(errno != 0 or tmp == arg or *tmp != '\0'){
2443
argp_error(state, "Bad delay");
2444
}
2445
case 132: /* --retry */
2446
errno = 0;
2447
retry_interval = strtod(arg, &tmp);
2448
if(errno != 0 or tmp == arg or *tmp != '\0'
2449
or (retry_interval * 1000) > INT_MAX
2450
or retry_interval < 0){
2451
argp_error(state, "Bad retry interval");
2452
}
2453
break;
2454
case 133: /* --network-hook-dir */
2455
hookdir = arg;
2456
break;
2457
/*
2458
* These reproduce what we would get without ARGP_NO_HELP
2459
*/
2460
case '?': /* --help */
2461
argp_state_help(state, state->out_stream,
2462
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2463
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2464
case -3: /* --usage */
2465
argp_state_help(state, state->out_stream,
2466
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2467
case 'V': /* --version */
2468
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2469
exit(argp_err_exit_status);
927
2470
break;
928
2471
default:
929
2472
return ARGP_ERR_UNKNOWN;
930
2473
}
931
return 0;
2474
return errno;
932
2475
}
933
2476
934
2477
struct argp argp = { .options = options, .parser = parse_opt,
935
2478
.args_doc = "",
936
2479
.doc = "Mandos client -- Get and decrypt"
937
2480
" passwords from a Mandos server" };
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
941
exitcode = EXIT_FAILURE;
2481
ret_errno = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret_errno){
2484
case 0:
2485
break;
2486
case ENOMEM:
2487
default:
2488
errno = ret_errno;
2489
perror_plus("argp_parse");
2490
exitcode = EX_OSERR;
2491
goto end;
2492
case EINVAL:
2493
exitcode = EX_USAGE;
942
2494
goto end;
943
2495
}
944
2496
}
945
2497
946
/* If the interface is down, bring it up */
947
2498
{
948
#ifdef __linux__
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
951
ret = klogctl(8, NULL, 5);
952
if(ret == -1){
953
perror("klogctl");
954
}
955
#endif
2499
/* Work around Debian bug #633582:
2500
<https://bugs.debian.org/633582> */
956
2501
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
958
if(sd < 0){
959
perror("socket");
960
exitcode = EXIT_FAILURE;
961
#ifdef __linux__
962
ret = klogctl(7, NULL, 0);
963
if(ret == -1){
964
perror("klogctl");
965
}
966
#endif
967
goto end;
968
}
969
strcpy(network.ifr_name, interface);
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
971
if(ret == -1){
972
perror("ioctl SIOCGIFFLAGS");
973
#ifdef __linux__
974
ret = klogctl(7, NULL, 0);
975
if(ret == -1){
976
perror("klogctl");
977
}
978
#endif
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
if((network.ifr_flags & IFF_UP) == 0){
983
network.ifr_flags |= IFF_UP;
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
985
if(ret == -1){
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
988
#ifdef __linux__
989
ret = klogctl(7, NULL, 0);
990
if(ret == -1){
991
perror("klogctl");
992
}
993
#endif
2502
/* Re-raise privileges */
2503
ret = raise_privileges();
2504
if(ret != 0){
2505
errno = ret;
2506
perror_plus("Failed to raise privileges");
2507
} else {
2508
struct stat st;
2509
2510
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2511
int seckey_fd = open(seckey, O_RDONLY);
2512
if(seckey_fd == -1){
2513
perror_plus("open");
2514
} else {
2515
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2516
if(ret == -1){
2517
perror_plus("fstat");
2518
} else {
2519
if(S_ISREG(st.st_mode)
2520
and st.st_uid == 0 and st.st_gid == 0){
2521
ret = fchown(seckey_fd, uid, gid);
2522
if(ret == -1){
2523
perror_plus("fchown");
2524
}
2525
}
2526
}
2527
close(seckey_fd);
2528
}
2529
}
2530
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
int pubkey_fd = open(pubkey, O_RDONLY);
2533
if(pubkey_fd == -1){
2534
perror_plus("open");
2535
} else {
2536
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2537
if(ret == -1){
2538
perror_plus("fstat");
2539
} else {
2540
if(S_ISREG(st.st_mode)
2541
and st.st_uid == 0 and st.st_gid == 0){
2542
ret = fchown(pubkey_fd, uid, gid);
2543
if(ret == -1){
2544
perror_plus("fchown");
2545
}
2546
}
2547
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
2574
/* Lower privileges */
2575
ret = lower_privileges();
2576
if(ret != 0){
2577
errno = ret;
2578
perror_plus("Failed to lower privileges");
2579
}
2580
}
2581
}
2582
2583
/* Remove invalid interface names (except "none") */
2584
{
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2593
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2595
interface = NULL;
2596
}
2597
}
2598
}
2599
2600
/* Run network hooks */
2601
{
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
994
2606
goto end;
995
2607
}
996
}
997
/* sleep checking until interface is running */
998
for(int i=0; i < delay * 4; i++){
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1000
if(ret == -1){
1001
perror("ioctl SIOCGIFFLAGS");
1002
} else if(network.ifr_flags & IFF_RUNNING){
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
2613
}
2614
2615
if(not debug){
2616
avahi_set_log_function(empty_log);
2617
}
2618
2619
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2620
from the signal handler */
2621
/* Initialize the pseudo-RNG for Avahi */
2622
srand((unsigned int) time(NULL));
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
2625
fprintf_plus(stderr,
2626
"Avahi: Failed to create simple poll object.\n");
2627
exitcode = EX_UNAVAILABLE;
2628
goto end;
2629
}
2630
2631
sigemptyset(&sigterm_action.sa_mask);
2632
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2633
if(ret == -1){
2634
perror_plus("sigaddset");
2635
exitcode = EX_OSERR;
2636
goto end;
2637
}
2638
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2639
if(ret == -1){
2640
perror_plus("sigaddset");
2641
exitcode = EX_OSERR;
2642
goto end;
2643
}
2644
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2645
if(ret == -1){
2646
perror_plus("sigaddset");
2647
exitcode = EX_OSERR;
2648
goto end;
2649
}
2650
/* Need to check if the handler is SIG_IGN before handling:
2651
| [[info:libc:Initial Signal Actions]] |
2652
| [[info:libc:Basic Signal Handling]] |
2653
*/
2654
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2655
if(ret == -1){
2656
perror_plus("sigaction");
2657
return EX_OSERR;
2658
}
2659
if(old_sigterm_action.sa_handler != SIG_IGN){
2660
ret = sigaction(SIGINT, &sigterm_action, NULL);
2661
if(ret == -1){
2662
perror_plus("sigaction");
2663
exitcode = EX_OSERR;
2664
goto end;
2665
}
2666
}
2667
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2668
if(ret == -1){
2669
perror_plus("sigaction");
2670
return EX_OSERR;
2671
}
2672
if(old_sigterm_action.sa_handler != SIG_IGN){
2673
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2674
if(ret == -1){
2675
perror_plus("sigaction");
2676
exitcode = EX_OSERR;
2677
goto end;
2678
}
2679
}
2680
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2681
if(ret == -1){
2682
perror_plus("sigaction");
2683
return EX_OSERR;
2684
}
2685
if(old_sigterm_action.sa_handler != SIG_IGN){
2686
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2687
if(ret == -1){
2688
perror_plus("sigaction");
2689
exitcode = EX_OSERR;
2690
goto end;
2691
}
2692
}
2693
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2699
alphasort);
2700
if(ret >= 1){
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2705
if(ret_errno != 0){
2706
errno = ret_errno;
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2709
continue;
2710
}
2711
if(debug){
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2714
}
2715
free(direntries[i]);
2716
}
2717
free(direntries);
2718
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2723
exitcode = EXIT_FAILURE;
2724
goto end;
2725
}
2726
}
2727
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
}
2746
}
1003
2747
break;
1004
2748
}
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
1006
ret = nanosleep(&sleeptime, NULL);
1007
if(ret == -1 and errno != EINTR){
1008
perror("nanosleep");
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2755
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2762
}
1009
2763
}
1010
2764
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1014
}
1015
#ifdef __linux__
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1018
if(ret == -1){
1019
perror("klogctl");
1020
}
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1038
if(ret == -1){
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
}
2768
}
2769
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2777
}
2778
2779
if(quit_now){
2780
goto end;
2781
}
2782
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2784
if(ret == -1){
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
2786
exitcode = EX_UNAVAILABLE;
1041
2787
goto end;
1042
2788
} else {
1043
2789
gnutls_initialized = true;
1044
2790
}
1045
2791
1046
if(mkdtemp(tempdir) == NULL){
1047
perror("mkdtemp");
1048
goto end;
1049
}
1050
tempdir_created = true;
1051
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2792
if(quit_now){
2793
goto end;
2794
}
2795
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
2806
perror_plus("mkdtemp");
2807
goto end;
2808
}
2809
2810
if(quit_now){
2811
goto end;
2812
}
2813
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2815
fprintf_plus(stderr, "init_gpgme failed\n");
2816
exitcode = EX_UNAVAILABLE;
1055
2817
goto end;
1056
2818
} else {
1057
2819
gpgme_initialized = true;
1058
2820
}
1059
2821
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
2822
if(quit_now){
1064
2823
goto end;
1065
2824
}
1066
2825
1068
2827
/* Connect directly, do not use Zeroconf */
1069
2828
/* (Mainly meant for debugging) */
1070
2829
char *address = strrchr(connect_to, ':');
2830
1071
2831
if(address == NULL){
1072
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
1076
uint16_t port;
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1080
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
1084
port = (uint16_t)tmpmax;
2832
fprintf_plus(stderr, "No colon in address\n");
2833
exitcode = EX_USAGE;
2834
goto end;
2835
}
2836
2837
if(quit_now){
2838
goto end;
2839
}
2840
2841
in_port_t port;
2842
errno = 0;
2843
tmpmax = strtoimax(address+1, &tmp, 10);
2844
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2845
or tmpmax != (in_port_t)tmpmax){
2846
fprintf_plus(stderr, "Bad port number\n");
2847
exitcode = EX_USAGE;
2848
goto end;
2849
}
2850
2851
if(quit_now){
2852
goto end;
2853
}
2854
2855
port = (in_port_t)tmpmax;
1085
2856
*address = '\0';
2857
/* Colon in address indicates IPv6 */
2858
int af;
2859
if(strchr(connect_to, ':') != NULL){
2860
af = AF_INET6;
2861
/* Accept [] around IPv6 address - see RFC 5952 */
2862
if(connect_to[0] == '[' and address[-1] == ']')
2863
{
2864
connect_to++;
2865
address[-1] = '\0';
2866
}
2867
} else {
2868
af = AF_INET;
2869
}
1086
2870
address = connect_to;
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1090
} else {
2871
2872
if(quit_now){
2873
goto end;
2874
}
2875
2876
while(not quit_now){
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2879
if(quit_now or ret == 0){
2880
break;
2881
}
2882
if(debug){
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2884
(int)retry_interval);
2885
}
2886
sleep((unsigned int)retry_interval);
2887
}
2888
2889
if(not quit_now){
1091
2890
exitcode = EXIT_SUCCESS;
1092
2891
}
2892
1093
2893
goto end;
1094
2894
}
1095
2895
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
2896
if(quit_now){
1108
2897
goto end;
1109
2898
}
1110
2899
1118
2907
config.publish_domain = 0;
1119
2908
1120
2909
/* Allocate a new server */
1121
mc.server = avahi_server_new(avahi_simple_poll_get
1122
(mc.simple_poll), &config, NULL,
1123
NULL, &error);
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret);
1124
2912
1125
2913
/* Free the Avahi configuration data */
1126
2914
avahi_server_config_free(&config);
1128
2916
1129
2917
/* Check if creating the Avahi server object succeeded */
1130
2918
if(mc.server == NULL){
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
1132
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret));
2921
exitcode = EX_UNAVAILABLE;
2922
goto end;
2923
}
2924
2925
if(quit_now){
1134
2926
goto end;
1135
2927
}
1136
2928
1137
2929
/* Create the Avahi service browser */
1138
2930
sb = avahi_s_service_browser_new(mc.server, if_index,
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
2931
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
1141
2934
if(sb == NULL){
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1143
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2936
avahi_strerror(avahi_server_errno(mc.server)));
2937
exitcode = EX_UNAVAILABLE;
2938
goto end;
2939
}
2940
2941
if(quit_now){
1145
2942
goto end;
1146
2943
}
1147
2944
1148
2945
/* Run the main loop */
1149
2946
1150
2947
if(debug){
1151
fprintf(stderr, "Starting Avahi loop search\n");
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
1152
2949
}
1153
2950
1154
avahi_simple_poll_loop(mc.simple_poll);
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2953
if(debug){
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
(ret == 0) ? "successfully" : "with error");
2956
}
1155
2957
1156
2958
end:
1157
2959
1158
2960
if(debug){
1159
fprintf(stderr, "%s exiting\n", argv[0]);
2961
if(signal_received){
2962
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2963
argv[0], signal_received,
2964
strsignal(signal_received));
2965
} else {
2966
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
}
1160
2968
}
1161
2969
1162
2970
/* Cleanup things */
2971
free(mc.interfaces);
2972
1163
2973
if(sb != NULL)
1164
2974
avahi_s_service_browser_free(sb);
1165
2975
1166
2976
if(mc.server != NULL)
1167
2977
avahi_server_free(mc.server);
1168
2978
1169
if(mc.simple_poll != NULL)
1170
avahi_simple_poll_free(mc.simple_poll);
2979
if(simple_poll != NULL)
2980
avahi_simple_poll_free(simple_poll);
1171
2981
1172
2982
if(gnutls_initialized){
1173
2983
gnutls_certificate_free_credentials(mc.cred);
1174
gnutls_global_deinit();
1175
2984
gnutls_dh_params_deinit(mc.dh_params);
1176
2985
}
1177
2986
1179
2988
gpgme_release(mc.ctx);
1180
2989
}
1181
2990
1182
/* Removes the temp directory used by GPGME */
1183
if(tempdir_created){
1184
DIR *d;
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1187
if(d == NULL){
1188
if(errno != ENOENT){
1189
perror("opendir");
1190
}
1191
} else {
1192
while(true){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1195
break;
1196
}
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1202
continue;
1203
}
1204
char *fullname = NULL;
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
1206
direntry->d_name);
1207
if(ret < 0){
1208
perror("asprintf");
1209
continue;
1210
}
1211
ret = remove(fullname);
1212
if(ret == -1){
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1214
strerror(errno));
1215
}
1216
free(fullname);
1217
}
1218
closedir(d);
1219
}
1220
ret = rmdir(tempdir);
1221
if(ret == -1 and errno != ENOENT){
1222
perror("rmdir");
1223
}
2991
/* Cleans up the circular linked list of Mandos servers the client
2992
has seen */
2993
if(mc.current_server != NULL){
2994
mc.current_server->prev->next = NULL;
2995
while(mc.current_server != NULL){
2996
server *next = mc.current_server->next;
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic push
2999
#pragma GCC diagnostic ignored "-Wcast-qual"
3000
#endif
3001
free((char *)(mc.current_server->ip));
3002
#ifdef __GNUC__
3003
#pragma GCC diagnostic pop
3004
#endif
3005
free(mc.current_server);
3006
mc.current_server = next;
3007
}
3008
}
3009
3010
/* Re-raise privileges */
3011
{
3012
ret = raise_privileges();
3013
if(ret != 0){
3014
errno = ret;
3015
perror_plus("Failed to raise privileges");
3016
} else {
3017
3018
/* Run network hooks */
3019
run_network_hooks("stop", interfaces_hooks != NULL ?
3020
interfaces_hooks : "", delay);
3021
3022
/* Take down the network interfaces which were brought up */
3023
{
3024
char *interface = NULL;
3025
while((interface=argz_next(interfaces_to_take_down,
3026
interfaces_to_take_down_size,
3027
interface))){
3028
ret = take_down_interface(interface);
3029
if(ret != 0){
3030
errno = ret;
3031
perror_plus("Failed to take down interface");
3032
}
3033
}
3034
if(debug and (interfaces_to_take_down == NULL)){
3035
fprintf_plus(stderr, "No interfaces needed to be taken"
3036
" down\n");
3037
}
3038
}
3039
}
3040
3041
ret = lower_privileges_permanently();
3042
if(ret != 0){
3043
errno = ret;
3044
perror_plus("Failed to lower privileges permanently");
3045
}
3046
}
3047
3048
free(interfaces_to_take_down);
3049
free(interfaces_hooks);
3050
3051
void clean_dir_at(int base, const char * const dirname,
3052
uintmax_t level){
3053
struct dirent **direntries = NULL;
3054
int dret;
3055
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3056
O_RDONLY
3057
| O_NOFOLLOW
3058
| O_DIRECTORY
3059
| O_PATH));
3060
if(dir_fd == -1){
3061
perror_plus("open");
3062
}
3063
int numentries = scandirat(dir_fd, ".", &direntries,
3064
notdotentries, alphasort);
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
if(debug){
3068
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3069
dirname, direntries[i]->d_name);
3070
}
3071
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3072
if(dret == -1){
3073
if(errno == EISDIR){
3074
dret = unlinkat(dir_fd, direntries[i]->d_name,
3075
AT_REMOVEDIR);
3076
}
3077
if((dret == -1) and (errno == ENOTEMPTY)
3078
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3079
== 0) and (level == 0)){
3080
/* Recurse only in this special case */
3081
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3082
dret = 0;
3083
}
3084
if(dret == -1){
3085
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3086
direntries[i]->d_name, strerror(errno));
3087
}
3088
}
3089
free(direntries[i]);
3090
}
3091
3092
/* need to clean even if 0 because man page doesn't specify */
3093
free(direntries);
3094
if(numentries == -1){
3095
perror_plus("scandirat");
3096
}
3097
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3098
if(dret == -1 and errno != ENOENT){
3099
perror_plus("rmdir");
3100
}
3101
} else {
3102
perror_plus("scandirat");
3103
}
3104
close(dir_fd);
3105
}
3106
3107
/* Removes the GPGME temp directory and all files inside */
3108
if(tempdir != NULL){
3109
clean_dir_at(-1, tempdir, 0);
3110
}
3111
3112
if(quit_now){
3113
sigemptyset(&old_sigterm_action.sa_mask);
3114
old_sigterm_action.sa_handler = SIG_DFL;
3115
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3116
&old_sigterm_action,
3117
NULL));
3118
if(ret == -1){
3119
perror_plus("sigaction");
3120
}
3121
do {
3122
ret = raise(signal_received);
3123
} while(ret != 0 and errno == EINTR);
3124
if(ret != 0){
3125
perror_plus("raise");
3126
abort();
3127
}
3128
TEMP_FAILURE_RETRY(pause());
1224
3129
}
1225
3130
1226
3131
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0