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- Committer: Teddy Hogeborn
- Date: 2009-09-16 23:28:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20090916232839-3o7i8qmcdcz5j1ya
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
"$syslog", thanks to Petter Reinholdtsen
<pere@hungry.com> (Debian bug #546928).
* initramfs-tools-script: Removed erroneous comment.
* plugins.d/askpass-fifo.c: Removed TEMP_FAILURE_RETRY since it is
not needed.
* plugins.d/mandos-client.c (main): Bug fix: Initialize
"old_sigterm_action".
* plugins.d/splashy.c (main): Bug fix: really check return value from
"sigaddset". Fix some warnings on
64-bit systems.
* plugins.d/usplash.c (termination_handler, main): Save received
signal and
re-raise it on
exit.
(usplash_write): Do not close FIFO, instead, take an additional file
descriptor pointer to it and open only when needed
(all callers changed). Abort immediately on EINTR.
Bug fix: Add NUL byte on single-word commands.
Ignore "interrupted_by_signal".
(makeprompt, find_usplash): New; broken out from "main()".
(find_usplash): Bug fix: close /proc/<pid>/cmdline FD on error.
(main): Reorganized to jump to a new "failure" label on any error.
Bug fix: check return values from sigaddset.
New variable "usplash_accessed" to flag if usplash(8) needs
to be killed and restarted. Removed the "an_error_occured"
variable.
"$syslog", thanks to Petter Reinholdtsen
<pere@hungry.com> (Debian bug #546928).
* initramfs-tools-script: Removed erroneous comment.
* plugins.d/askpass-fifo.c: Removed TEMP_FAILURE_RETRY since it is
not needed.
* plugins.d/mandos-client.c (main): Bug fix: Initialize
"old_sigterm_action".
* plugins.d/splashy.c (main): Bug fix: really check return value from
"sigaddset". Fix some warnings on
64-bit systems.
* plugins.d/usplash.c (termination_handler, main): Save received
signal and
re-raise it on
exit.
(usplash_write): Do not close FIFO, instead, take an additional file
descriptor pointer to it and open only when needed
(all callers changed). Abort immediately on EINTR.
Bug fix: Add NUL byte on single-word commands.
Ignore "interrupted_by_signal".
(makeprompt, find_usplash): New; broken out from "main()".
(find_usplash): Bug fix: close /proc/<pid>/cmdline FD on error.
(main): Reorganized to jump to a new "failure" label on any error.
Bug fix: check return values from sigaddset.
New variable "usplash_accessed" to flag if usplash(8) needs
to be killed and restarted. Removed the "an_error_occured"
variable.
- files removed:
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
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* 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
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* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
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strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
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SOCK_STREAM, uid_t, gid_t, open(),
55
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opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
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strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
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if_nametoindex(), IF_NAMESIZE */
73
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*/
74
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
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getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
84
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#include <signal.h> /* sigemptyset(), sigaddset(),
85
83
sigaction(), SIGTERM, sig_atomic_t,
86
84
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
85
99
86
#ifdef __linux__
100
87
#include <sys/klog.h> /* klogctl() */
118
105
init_gnutls_session(),
119
106
GNUTLS_* */
120
107
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
123
110
124
111
/* GPGME */
125
112
#include <gpgme.h> /* All GPGME types, constants and
133
120
#define PATHDIR "/conf/conf.d/mandos"
134
121
#define SECKEY "seckey.txt"
135
122
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
123
138
124
bool debug = false;
139
125
static const char mandos_protocol_version[] = "1";
140
126
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
128
160
129
/* Used for passing in values through the Avahi callback functions */
161
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
162
132
AvahiServer *server;
163
133
gnutls_certificate_credentials_t cred;
164
134
unsigned int dh_bits;
165
135
gnutls_dh_params_t dh_params;
166
136
const char *priority;
167
137
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
138
} mandos_context;
172
139
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
197
144
198
145
/*
199
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
147
* bytes. "buffer_capacity" is how much is currently allocated,
201
148
* "buffer_length" is how much is already used.
202
149
*/
203
__attribute__((nonnull, warn_unused_result))
204
150
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
151
size_t buffer_capacity){
206
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
213
155
return 0;
214
156
}
215
*buffer = new_buf;
216
157
buffer_capacity += BUFFER_SIZE;
217
158
}
218
159
return buffer_capacity;
219
160
}
220
161
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
269
162
/*
270
163
* Initialize GPGME.
271
164
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
277
167
gpgme_error_t rc;
278
168
gpgme_engine_info_t engine_info;
279
169
170
280
171
/*
281
172
* Helper function to insert pub and seckey to the engine keyring.
282
173
*/
283
bool import_key(const char * const filename){
174
bool import_key(const char *filename){
284
175
int ret;
285
176
int fd;
286
177
gpgme_data_t pgp_data;
287
178
288
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
180
if(fd == -1){
290
perror_plus("open");
181
perror("open");
291
182
return false;
292
183
}
293
184
294
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
186
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
298
189
return false;
299
190
}
300
191
301
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
302
193
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
305
196
return false;
306
197
}
307
198
308
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
200
if(ret == -1){
310
perror_plus("close");
201
perror("close");
311
202
}
312
203
gpgme_data_release(pgp_data);
313
204
return true;
314
205
}
315
206
316
207
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
318
209
}
319
210
320
211
/* Init GPGME */
321
212
gpgme_check_version(NULL);
322
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
214
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
326
217
return false;
327
218
}
328
219
329
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
330
221
rc = gpgme_get_engine_info(&engine_info);
331
222
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
334
225
return false;
335
226
}
336
227
while(engine_info != NULL){
342
233
engine_info = engine_info->next;
343
234
}
344
235
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
237
return false;
348
238
}
349
239
350
240
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
352
242
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
356
245
return false;
357
246
}
358
247
367
256
* Decrypt OpenPGP data.
368
257
* Returns -1 on error
369
258
*/
370
__attribute__((nonnull, warn_unused_result))
371
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
260
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
261
char **plaintext){
375
262
gpgme_data_t dh_crypto, dh_plain;
376
263
gpgme_error_t rc;
377
264
ssize_t ret;
379
266
ssize_t plaintext_length = 0;
380
267
381
268
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
270
}
384
271
385
272
/* Create new GPGME data buffer from memory cryptotext */
386
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
274
0);
388
275
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
391
278
return -1;
392
279
}
393
280
394
281
/* Create new empty GPGME data buffer for the plaintext */
395
282
rc = gpgme_data_new(&dh_plain);
396
283
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
400
286
gpgme_data_release(dh_crypto);
401
287
return -1;
402
288
}
403
289
404
290
/* Decrypt data from the cryptotext data buffer to the plaintext
405
291
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
293
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
410
296
plaintext_length = -1;
411
297
if(debug){
412
298
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
414
300
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
302
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
421
307
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
423
309
}
424
310
gpgme_recipient_t recipient;
425
311
recipient = result->recipients;
426
312
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
434
319
recipient = recipient->next;
435
320
}
436
321
}
439
324
}
440
325
441
326
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
328
}
444
329
445
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
448
333
plaintext_length = -1;
449
334
goto decrypt_end;
450
335
}
452
337
*plaintext = NULL;
453
338
while(true){
454
339
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
457
342
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
461
346
}
462
347
463
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
468
353
break;
469
354
}
470
355
if(ret < 0){
471
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
472
357
plaintext_length = -1;
473
358
goto decrypt_end;
474
359
}
476
361
}
477
362
478
363
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
480
365
for(ssize_t i = 0; i < plaintext_length; i++){
481
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
367
}
493
378
return plaintext_length;
494
379
}
495
380
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
385
ret = "(unknown)";
386
return ret;
507
387
}
508
388
509
389
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
390
static void debuggnutls(__attribute__((unused)) int level,
512
391
const char* string){
513
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
514
393
}
515
394
516
__attribute__((nonnull, warn_unused_result))
517
395
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
mandos_context *mc){
396
const char *seckeyfilename){
520
397
int ret;
521
unsigned int uret;
522
398
523
399
if(debug){
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
525
401
}
526
402
527
403
ret = gnutls_global_init();
528
404
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
531
407
return -1;
532
408
}
533
409
540
416
}
541
417
542
418
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
544
420
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
547
426
gnutls_global_deinit();
548
427
return -1;
549
428
}
550
429
551
430
if(debug){
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
554
pubkeyfilename,
555
seckeyfilename);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
556
434
}
557
435
558
436
ret = gnutls_certificate_set_openpgp_key_file
559
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
560
438
GNUTLS_OPENPGP_FMT_BASE64);
561
439
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr,
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
safer_gnutls_strerror(ret));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
567
445
goto globalfail;
568
446
}
569
447
570
448
/* GnuTLS server initialization */
571
ret = gnutls_dh_params_init(&mc->dh_params);
449
ret = gnutls_dh_params_init(&mc.dh_params);
572
450
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
576
453
goto globalfail;
577
454
}
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
680
456
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
683
459
goto globalfail;
684
460
}
685
461
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
687
463
688
464
return 0;
689
465
690
466
globalfail:
691
467
692
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
693
469
gnutls_global_deinit();
694
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
695
471
return -1;
696
472
}
697
473
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
474
static int init_gnutls_session(gnutls_session_t *session){
701
475
int ret;
702
476
/* GnuTLS session creation */
703
477
do {
704
478
ret = gnutls_init(session, GNUTLS_SERVER);
705
if(quit_now){
706
return -1;
707
}
708
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
709
480
if(ret != GNUTLS_E_SUCCESS){
710
fprintf_plus(stderr,
711
"Error in GnuTLS session initialization: %s\n",
712
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
713
483
}
714
484
715
485
{
716
486
const char *err;
717
487
do {
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
719
if(quit_now){
720
gnutls_deinit(*session);
721
return -1;
722
}
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
723
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
724
490
if(ret != GNUTLS_E_SUCCESS){
725
fprintf_plus(stderr, "Syntax error at: %s\n", err);
726
fprintf_plus(stderr, "GnuTLS error: %s\n",
727
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
728
494
gnutls_deinit(*session);
729
495
return -1;
730
496
}
732
498
733
499
do {
734
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
735
mc->cred);
736
if(quit_now){
737
gnutls_deinit(*session);
738
return -1;
739
}
501
mc.cred);
740
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
741
503
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
743
safer_gnutls_strerror(ret));
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
safer_gnutls_strerror(ret));
744
506
gnutls_deinit(*session);
745
507
return -1;
746
508
}
748
510
/* ignore client certificate if any. */
749
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
512
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
752
514
753
515
return 0;
754
516
}
757
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
758
520
__attribute__((unused)) const char *txt){}
759
521
760
/* Set effective uid to 0, return errno */
761
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
765
if(seteuid(0) == -1){
766
ret_errno = errno;
767
}
768
errno = old_errno;
769
return ret_errno;
770
}
771
772
/* Set effective and real user ID to 0. Return errno. */
773
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
777
if(ret_errno != 0){
778
errno = old_errno;
779
return ret_errno;
780
}
781
if(setuid(0) == -1){
782
ret_errno = errno;
783
}
784
errno = old_errno;
785
return ret_errno;
786
}
787
788
/* Set effective user ID to unprivileged saved user ID */
789
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
793
if(seteuid(uid) == -1){
794
ret_errno = errno;
795
}
796
errno = old_errno;
797
return ret_errno;
798
}
799
800
/* Lower privileges permanently */
801
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
805
if(setuid(uid) == -1){
806
ret_errno = errno;
807
}
808
errno = old_errno;
809
return ret_errno;
810
}
811
812
/* Helper function to add_local_route() and delete_local_route() */
813
__attribute__((nonnull, warn_unused_result))
814
static bool add_delete_local_route(const bool add,
815
const char *address,
816
AvahiIfIndex if_index){
817
int ret;
818
char helper[] = "mandos-client-iprouteadddel";
819
char add_arg[] = "add";
820
char delete_arg[] = "delete";
821
char debug_flag[] = "--debug";
822
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
823
if(pluginhelperdir == NULL){
824
if(debug){
825
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
826
" variable not set; cannot run helper\n");
827
}
828
return false;
829
}
830
831
char interface[IF_NAMESIZE];
832
if(if_indextoname((unsigned int)if_index, interface) == NULL){
833
perror_plus("if_indextoname");
834
return false;
835
}
836
837
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
838
if(devnull == -1){
839
perror_plus("open(\"/dev/null\", O_RDONLY)");
840
return false;
841
}
842
pid_t pid = fork();
843
if(pid == 0){
844
/* Child */
845
/* Raise privileges */
846
errno = raise_privileges_permanently();
847
if(errno != 0){
848
perror_plus("Failed to raise privileges");
849
/* _exit(EX_NOPERM); */
850
} else {
851
/* Set group */
852
errno = 0;
853
ret = setgid(0);
854
if(ret == -1){
855
perror_plus("setgid");
856
_exit(EX_NOPERM);
857
}
858
/* Reset supplementary groups */
859
errno = 0;
860
ret = setgroups(0, NULL);
861
if(ret == -1){
862
perror_plus("setgroups");
863
_exit(EX_NOPERM);
864
}
865
}
866
ret = dup2(devnull, STDIN_FILENO);
867
if(ret == -1){
868
perror_plus("dup2(devnull, STDIN_FILENO)");
869
_exit(EX_OSERR);
870
}
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
872
if(ret == -1){
873
perror_plus("close");
874
_exit(EX_OSERR);
875
}
876
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
877
if(ret == -1){
878
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
879
_exit(EX_OSERR);
880
}
881
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
882
O_RDONLY
883
| O_DIRECTORY
884
| O_PATH
885
| O_CLOEXEC));
886
if(helperdir_fd == -1){
887
perror_plus("open");
888
_exit(EX_UNAVAILABLE);
889
}
890
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
891
helper, O_RDONLY));
892
if(helper_fd == -1){
893
perror_plus("openat");
894
_exit(EX_UNAVAILABLE);
895
}
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
897
#ifdef __GNUC__
898
#pragma GCC diagnostic push
899
#pragma GCC diagnostic ignored "-Wcast-qual"
900
#endif
901
if(fexecve(helper_fd, (char *const [])
902
{ helper, add ? add_arg : delete_arg, (char *)address,
903
interface, debug ? debug_flag : NULL, NULL },
904
environ) == -1){
905
#ifdef __GNUC__
906
#pragma GCC diagnostic pop
907
#endif
908
perror_plus("fexecve");
909
_exit(EXIT_FAILURE);
910
}
911
}
912
if(pid == -1){
913
perror_plus("fork");
914
return false;
915
}
916
int status;
917
pid_t pret = -1;
918
errno = 0;
919
do {
920
pret = waitpid(pid, &status, 0);
921
if(pret == -1 and errno == EINTR and quit_now){
922
int errno_raising = 0;
923
if((errno = raise_privileges()) != 0){
924
errno_raising = errno;
925
perror_plus("Failed to raise privileges in order to"
926
" kill helper program");
927
}
928
if(kill(pid, SIGTERM) == -1){
929
perror_plus("kill");
930
}
931
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
932
perror_plus("Failed to lower privileges after killing"
933
" helper program");
934
}
935
return false;
936
}
937
} while(pret == -1 and errno == EINTR);
938
if(pret == -1){
939
perror_plus("waitpid");
940
return false;
941
}
942
if(WIFEXITED(status)){
943
if(WEXITSTATUS(status) != 0){
944
fprintf_plus(stderr, "Error: iprouteadddel exited"
945
" with status %d\n", WEXITSTATUS(status));
946
return false;
947
}
948
return true;
949
}
950
if(WIFSIGNALED(status)){
951
fprintf_plus(stderr, "Error: iprouteadddel died by"
952
" signal %d\n", WTERMSIG(status));
953
return false;
954
}
955
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
956
return false;
957
}
958
959
__attribute__((nonnull, warn_unused_result))
960
static bool add_local_route(const char *address,
961
AvahiIfIndex if_index){
962
if(debug){
963
fprintf_plus(stderr, "Adding route to %s\n", address);
964
}
965
return add_delete_local_route(true, address, if_index);
966
}
967
968
__attribute__((nonnull, warn_unused_result))
969
static bool delete_local_route(const char *address,
970
AvahiIfIndex if_index){
971
if(debug){
972
fprintf_plus(stderr, "Removing route to %s\n", address);
973
}
974
return add_delete_local_route(false, address, if_index);
975
}
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
976
524
977
525
/* Called when a Mandos server is found */
978
__attribute__((nonnull, warn_unused_result))
979
static int start_mandos_communication(const char *ip, in_port_t port,
526
static int start_mandos_communication(const char *ip, uint16_t port,
980
527
AvahiIfIndex if_index,
981
int af, mandos_context *mc){
528
int af){
982
529
int ret, tcp_sd = -1;
983
530
ssize_t sret;
984
struct sockaddr_storage to;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
985
535
char *buffer = NULL;
986
char *decrypted_buffer = NULL;
536
char *decrypted_buffer;
987
537
size_t buffer_length = 0;
988
538
size_t buffer_capacity = 0;
989
539
size_t written;
990
int retval = -1;
540
int retval = 0;
991
541
gnutls_session_t session;
992
542
int pf; /* Protocol family */
993
bool route_added = false;
994
995
errno = 0;
996
543
997
544
if(quit_now){
998
errno = EINTR;
999
545
return -1;
1000
546
}
1001
547
1007
553
pf = PF_INET;
1008
554
break;
1009
555
default:
1010
fprintf_plus(stderr, "Bad address family: %d\n", af);
1011
errno = EINVAL;
556
fprintf(stderr, "Bad address family: %d\n", af);
1012
557
return -1;
1013
558
}
1014
559
1015
/* If the interface is specified and we have a list of interfaces */
1016
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1017
/* Check if the interface is one of the interfaces we are using */
1018
bool match = false;
1019
{
1020
char *interface = NULL;
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1022
interface))){
1023
if(if_nametoindex(interface) == (unsigned int)if_index){
1024
match = true;
1025
break;
1026
}
1027
}
1028
}
1029
if(not match){
1030
/* This interface does not match any in the list, so we don't
1031
connect to the server */
1032
if(debug){
1033
char interface[IF_NAMESIZE];
1034
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1035
perror_plus("if_indextoname");
1036
} else {
1037
fprintf_plus(stderr, "Skipping server on non-used interface"
1038
" \"%s\"\n",
1039
if_indextoname((unsigned int)if_index,
1040
interface));
1041
}
1042
}
1043
return -1;
1044
}
1045
}
1046
1047
ret = init_gnutls_session(&session, mc);
560
ret = init_gnutls_session(&session);
1048
561
if(ret != 0){
1049
562
return -1;
1050
563
}
1051
564
1052
565
if(debug){
1053
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1054
PRIuMAX "\n", ip, (uintmax_t)port);
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
567
"\n", ip, port);
1055
568
}
1056
569
1057
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
1058
571
if(tcp_sd < 0){
1059
int e = errno;
1060
perror_plus("socket");
1061
errno = e;
572
perror("socket");
573
retval = -1;
1062
574
goto mandos_end;
1063
575
}
1064
576
1065
577
if(quit_now){
1066
errno = EINTR;
1067
578
goto mandos_end;
1068
579
}
1069
580
1070
581
memset(&to, 0, sizeof(to));
1071
582
if(af == AF_INET6){
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1074
585
} else { /* IPv4 */
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
1077
588
}
1078
589
if(ret < 0 ){
1079
int e = errno;
1080
perror_plus("inet_pton");
1081
errno = e;
590
perror("inet_pton");
591
retval = -1;
1082
592
goto mandos_end;
1083
593
}
1084
594
if(ret == 0){
1085
int e = errno;
1086
fprintf_plus(stderr, "Bad address: %s\n", ip);
1087
errno = e;
595
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
1088
597
goto mandos_end;
1089
598
}
1090
599
if(af == AF_INET6){
1091
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1092
if(IN6_IS_ADDR_LINKLOCAL
1093
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
1094
607
if(if_index == AVAHI_IF_UNSPEC){
1095
fprintf_plus(stderr, "An IPv6 link-local address is"
1096
" incomplete without a network interface\n");
1097
errno = EINVAL;
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
1098
611
goto mandos_end;
1099
612
}
1100
613
/* Set the network interface number as scope */
1101
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
614
to.in6.sin6_scope_id = (uint32_t)if_index;
1102
615
}
1103
616
} else {
1104
((struct sockaddr_in *)&to)->sin_port = htons(port);
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
1105
620
}
1106
621
1107
622
if(quit_now){
1108
errno = EINTR;
1109
623
goto mandos_end;
1110
624
}
1111
625
1113
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1114
628
char interface[IF_NAMESIZE];
1115
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1116
perror_plus("if_indextoname");
630
perror("if_indextoname");
1117
631
} else {
1118
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1119
"\n", ip, interface, (uintmax_t)port);
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
1120
634
}
1121
635
} else {
1122
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1123
ip, (uintmax_t)port);
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
1124
638
}
1125
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1126
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1127
if(af == AF_INET6){
1128
ret = getnameinfo((struct sockaddr *)&to,
1129
sizeof(struct sockaddr_in6),
1130
addrstr, sizeof(addrstr), NULL, 0,
1131
NI_NUMERICHOST);
1132
} else {
1133
ret = getnameinfo((struct sockaddr *)&to,
1134
sizeof(struct sockaddr_in),
1135
addrstr, sizeof(addrstr), NULL, 0,
1136
NI_NUMERICHOST);
1137
}
1138
if(ret == EAI_SYSTEM){
1139
perror_plus("getnameinfo");
1140
} else if(ret != 0) {
1141
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1142
} else if(strcmp(addrstr, ip) != 0){
1143
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1144
}
1145
}
1146
1147
if(quit_now){
1148
errno = EINTR;
1149
goto mandos_end;
1150
}
1151
1152
while(true){
1153
if(af == AF_INET6){
1154
ret = connect(tcp_sd, (struct sockaddr *)&to,
1155
sizeof(struct sockaddr_in6));
1156
} else {
1157
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1158
sizeof(struct sockaddr_in));
1159
}
1160
if(ret < 0){
1161
if(errno == ENETUNREACH
1162
and if_index != AVAHI_IF_UNSPEC
1163
and connect_to == NULL
1164
and not route_added and
1165
((af == AF_INET6 and not
1166
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1167
&to)->sin6_addr)))
1168
or (af == AF_INET and
1169
/* Not a a IPv4LL address */
1170
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1171
& 0xFFFF0000L) != 0xA9FE0000L))){
1172
/* Work around Avahi bug - Avahi does not announce link-local
1173
addresses if it has a global address, so local hosts with
1174
*only* a link-local address (e.g. Mandos clients) cannot
1175
connect to a Mandos server announced by Avahi on a server
1176
host with a global address. Work around this by retrying
1177
with an explicit route added with the server's address.
1178
1179
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
https://bugs.debian.org/587961
1182
*/
1183
if(debug){
1184
fprintf_plus(stderr, "Mandos server unreachable, trying"
1185
" direct route\n");
1186
}
1187
int e = errno;
1188
route_added = add_local_route(ip, if_index);
1189
if(route_added){
1190
continue;
1191
}
1192
errno = e;
1193
}
1194
if(errno != ECONNREFUSED or debug){
1195
int e = errno;
1196
perror_plus("connect");
1197
errno = e;
1198
}
1199
goto mandos_end;
1200
}
1201
1202
if(quit_now){
1203
errno = EINTR;
1204
goto mandos_end;
1205
}
1206
break;
641
const char *pcret;
642
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
645
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
648
}
649
if(pcret == NULL){
650
perror("inet_ntop");
651
} else {
652
if(strcmp(addrstr, ip) != 0){
653
fprintf(stderr, "Canonical address form: %s\n", addrstr);
654
}
655
}
656
}
657
658
if(quit_now){
659
goto mandos_end;
660
}
661
662
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
664
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
666
}
667
if(ret < 0){
668
perror("connect");
669
retval = -1;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
goto mandos_end;
1207
675
}
1208
676
1209
677
const char *out = mandos_protocol_version;
1211
679
while(true){
1212
680
size_t out_size = strlen(out);
1213
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1214
out_size - written));
682
out_size - written));
1215
683
if(ret == -1){
1216
int e = errno;
1217
perror_plus("write");
1218
errno = e;
684
perror("write");
685
retval = -1;
1219
686
goto mandos_end;
1220
687
}
1221
688
written += (size_t)ret;
1231
698
}
1232
699
1233
700
if(quit_now){
1234
errno = EINTR;
1235
701
goto mandos_end;
1236
702
}
1237
703
}
1238
704
1239
705
if(debug){
1240
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1241
707
}
1242
708
1243
709
if(quit_now){
1244
errno = EINTR;
1245
710
goto mandos_end;
1246
711
}
1247
712
1248
/* This casting via intptr_t is to eliminate warning about casting
1249
an int to a pointer type. This is exactly how the GnuTLS Guile
1250
function "set-session-transport-fd!" does it. */
1251
gnutls_transport_set_ptr(session,
1252
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1253
714
1254
715
if(quit_now){
1255
errno = EINTR;
1256
716
goto mandos_end;
1257
717
}
1258
718
1259
719
do {
1260
720
ret = gnutls_handshake(session);
1261
721
if(quit_now){
1262
errno = EINTR;
1263
722
goto mandos_end;
1264
723
}
1265
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1266
725
1267
726
if(ret != GNUTLS_E_SUCCESS){
1268
727
if(debug){
1269
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1270
729
gnutls_perror(ret);
1271
730
}
1272
errno = EPROTO;
731
retval = -1;
1273
732
goto mandos_end;
1274
733
}
1275
734
1276
735
/* Read OpenPGP packet that contains the wanted password */
1277
736
1278
737
if(debug){
1279
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1280
" %s\n", ip);
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
739
ip);
1281
740
}
1282
741
1283
742
while(true){
1284
743
1285
744
if(quit_now){
1286
errno = EINTR;
1287
745
goto mandos_end;
1288
746
}
1289
747
1290
748
buffer_capacity = incbuffer(&buffer, buffer_length,
1291
buffer_capacity);
749
buffer_capacity);
1292
750
if(buffer_capacity == 0){
1293
int e = errno;
1294
perror_plus("incbuffer");
1295
errno = e;
751
perror("incbuffer");
752
retval = -1;
1296
753
goto mandos_end;
1297
754
}
1298
755
1299
756
if(quit_now){
1300
errno = EINTR;
1301
757
goto mandos_end;
1302
758
}
1303
759
1316
772
ret = gnutls_handshake(session);
1317
773
1318
774
if(quit_now){
1319
errno = EINTR;
1320
775
goto mandos_end;
1321
776
}
1322
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1323
778
if(ret < 0){
1324
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1325
"***\n");
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1326
780
gnutls_perror(ret);
1327
errno = EPROTO;
781
retval = -1;
1328
782
goto mandos_end;
1329
783
}
1330
784
break;
1331
785
default:
1332
fprintf_plus(stderr, "Unknown error while reading data from"
1333
" encrypted session with Mandos server\n");
786
fprintf(stderr, "Unknown error while reading data from"
787
" encrypted session with Mandos server\n");
788
retval = -1;
1334
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1335
errno = EIO;
1336
790
goto mandos_end;
1337
791
}
1338
792
} else {
1341
795
}
1342
796
1343
797
if(debug){
1344
fprintf_plus(stderr, "Closing TLS session\n");
1345
}
1346
1347
if(quit_now){
1348
errno = EINTR;
1349
goto mandos_end;
1350
}
1351
1352
do {
1353
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1354
if(quit_now){
1355
errno = EINTR;
1356
goto mandos_end;
1357
}
1358
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
798
fprintf(stderr, "Closing TLS session\n");
799
}
800
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
1359
810
1360
811
if(buffer_length > 0){
1361
812
ssize_t decrypted_buffer_size;
1362
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1363
&decrypted_buffer, mc);
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
buffer_length,
815
&decrypted_buffer);
1364
816
if(decrypted_buffer_size >= 0){
1365
817
1366
818
written = 0;
1367
819
while(written < (size_t) decrypted_buffer_size){
1368
820
if(quit_now){
1369
errno = EINTR;
1370
821
goto mandos_end;
1371
822
}
1372
823
1374
825
(size_t)decrypted_buffer_size - written,
1375
826
stdout);
1376
827
if(ret == 0 and ferror(stdout)){
1377
int e = errno;
1378
828
if(debug){
1379
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1380
strerror(errno));
829
fprintf(stderr, "Error writing encrypted data: %s\n",
830
strerror(errno));
1381
831
}
1382
errno = e;
1383
goto mandos_end;
832
retval = -1;
833
break;
1384
834
}
1385
835
written += (size_t)ret;
1386
836
}
1387
retval = 0;
837
free(decrypted_buffer);
838
} else {
839
retval = -1;
1388
840
}
841
} else {
842
retval = -1;
1389
843
}
1390
844
1391
845
/* Shutdown procedure */
1392
846
1393
847
mandos_end:
1394
{
1395
if(route_added){
1396
if(not delete_local_route(ip, if_index)){
1397
fprintf_plus(stderr, "Failed to delete local route to %s on"
1398
" interface %d", ip, if_index);
1399
}
1400
}
1401
int e = errno;
1402
free(decrypted_buffer);
1403
free(buffer);
1404
if(tcp_sd >= 0){
1405
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1406
}
1407
if(ret == -1){
1408
if(e == 0){
1409
e = errno;
1410
}
1411
perror_plus("close");
1412
}
1413
gnutls_deinit(session);
1414
errno = e;
1415
if(quit_now){
1416
errno = EINTR;
1417
retval = -1;
1418
}
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
1419
858
}
1420
859
return retval;
1421
860
}
1422
861
1423
__attribute__((nonnull))
1424
862
static void resolve_callback(AvahiSServiceResolver *r,
1425
863
AvahiIfIndex interface,
1426
864
AvahiProtocol proto,
1434
872
AVAHI_GCC_UNUSED AvahiStringList *txt,
1435
873
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1436
874
flags,
1437
void *mc){
1438
if(r == NULL){
1439
return;
1440
}
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1441
877
1442
878
/* Called whenever a service has been resolved successfully or
1443
879
timed out */
1444
880
1445
881
if(quit_now){
1446
avahi_s_service_resolver_free(r);
1447
882
return;
1448
883
}
1449
884
1450
885
switch(event){
1451
886
default:
1452
887
case AVAHI_RESOLVER_FAILURE:
1453
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1454
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1455
domain,
1456
avahi_strerror(avahi_server_errno
1457
(((mandos_context*)mc)->server)));
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
1458
891
break;
1459
892
1460
893
case AVAHI_RESOLVER_FOUND:
1462
895
char ip[AVAHI_ADDRESS_STR_MAX];
1463
896
avahi_address_snprint(ip, sizeof(ip), address);
1464
897
if(debug){
1465
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1466
PRIdMAX ") on port %" PRIu16 "\n", name,
1467
host_name, ip, (intmax_t)interface, port);
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
1468
901
}
1469
int ret = start_mandos_communication(ip, (in_port_t)port,
1470
interface,
1471
avahi_proto_to_af(proto),
1472
mc);
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1473
904
if(ret == 0){
1474
avahi_simple_poll_quit(simple_poll);
1475
} else {
1476
if(not add_server(ip, (in_port_t)port, interface,
1477
avahi_proto_to_af(proto),
1478
&((mandos_context*)mc)->current_server)){
1479
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1480
" list\n", name);
1481
}
905
avahi_simple_poll_quit(mc.simple_poll);
1482
906
}
1483
907
}
1484
908
}
1494
918
const char *domain,
1495
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1496
920
flags,
1497
void *mc){
1498
if(b == NULL){
1499
return;
1500
}
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1501
923
1502
924
/* Called whenever a new services becomes available on the LAN or
1503
925
is removed from the LAN */
1510
932
default:
1511
933
case AVAHI_BROWSER_FAILURE:
1512
934
1513
fprintf_plus(stderr, "(Avahi browser) %s\n",
1514
avahi_strerror(avahi_server_errno
1515
(((mandos_context*)mc)->server)));
1516
avahi_simple_poll_quit(simple_poll);
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
1517
938
return;
1518
939
1519
940
case AVAHI_BROWSER_NEW:
1522
943
the callback function is called the Avahi server will free the
1523
944
resolver for us. */
1524
945
1525
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1526
interface, protocol, name, type,
1527
domain, protocol, 0,
1528
resolve_callback, mc) == NULL)
1529
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1530
" %s\n", name,
1531
avahi_strerror(avahi_server_errno
1532
(((mandos_context*)mc)->server)));
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
1533
951
break;
1534
952
1535
953
case AVAHI_BROWSER_REMOVE:
1538
956
case AVAHI_BROWSER_ALL_FOR_NOW:
1539
957
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1540
958
if(debug){
1541
fprintf_plus(stderr, "No Mandos server found, still"
1542
" searching...\n");
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1543
960
}
1544
961
break;
1545
962
}
1546
963
}
1547
964
1548
/* Signal handler that stops main loop after SIGTERM */
965
/* stop main loop after sigterm has been called */
1549
966
static void handle_sigterm(int sig){
1550
967
if(quit_now){
1551
968
return;
1553
970
quit_now = 1;
1554
971
signal_received = sig;
1555
972
int old_errno = errno;
1556
/* set main loop to exit */
1557
if(simple_poll != NULL){
1558
avahi_simple_poll_quit(simple_poll);
1559
}
1560
errno = old_errno;
1561
}
1562
1563
__attribute__((nonnull, warn_unused_result))
1564
bool get_flags(const char *ifname, struct ifreq *ifr){
1565
int ret;
1566
error_t ret_errno;
1567
1568
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1569
if(s < 0){
1570
ret_errno = errno;
1571
perror_plus("socket");
1572
errno = ret_errno;
1573
return false;
1574
}
1575
strcpy(ifr->ifr_name, ifname);
1576
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1577
if(ret == -1){
1578
if(debug){
1579
ret_errno = errno;
1580
perror_plus("ioctl SIOCGIFFLAGS");
1581
errno = ret_errno;
1582
}
1583
return false;
1584
}
1585
return true;
1586
}
1587
1588
__attribute__((nonnull, warn_unused_result))
1589
bool good_flags(const char *ifname, const struct ifreq *ifr){
1590
1591
/* Reject the loopback device */
1592
if(ifr->ifr_flags & IFF_LOOPBACK){
1593
if(debug){
1594
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1595
ifname);
1596
}
1597
return false;
1598
}
1599
/* Accept point-to-point devices only if connect_to is specified */
1600
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1601
if(debug){
1602
fprintf_plus(stderr, "Accepting point-to-point interface"
1603
" \"%s\"\n", ifname);
1604
}
1605
return true;
1606
}
1607
/* Otherwise, reject non-broadcast-capable devices */
1608
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1609
if(debug){
1610
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1611
" \"%s\"\n", ifname);
1612
}
1613
return false;
1614
}
1615
/* Reject non-ARP interfaces (including dummy interfaces) */
1616
if(ifr->ifr_flags & IFF_NOARP){
1617
if(debug){
1618
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1619
ifname);
1620
}
1621
return false;
1622
}
1623
1624
/* Accept this device */
1625
if(debug){
1626
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1627
}
1628
return true;
1629
}
1630
1631
/*
1632
* This function determines if a directory entry in /sys/class/net
1633
* corresponds to an acceptable network device.
1634
* (This function is passed to scandir(3) as a filter function.)
1635
*/
1636
__attribute__((nonnull, warn_unused_result))
1637
int good_interface(const struct dirent *if_entry){
1638
if(if_entry->d_name[0] == '.'){
1639
return 0;
1640
}
1641
1642
struct ifreq ifr;
1643
if(not get_flags(if_entry->d_name, &ifr)){
1644
if(debug){
1645
fprintf_plus(stderr, "Failed to get flags for interface "
1646
"\"%s\"\n", if_entry->d_name);
1647
}
1648
return 0;
1649
}
1650
1651
if(not good_flags(if_entry->d_name, &ifr)){
1652
return 0;
1653
}
1654
return 1;
1655
}
1656
1657
/*
1658
* This function determines if a network interface is up.
1659
*/
1660
__attribute__((nonnull, warn_unused_result))
1661
bool interface_is_up(const char *interface){
1662
struct ifreq ifr;
1663
if(not get_flags(interface, &ifr)){
1664
if(debug){
1665
fprintf_plus(stderr, "Failed to get flags for interface "
1666
"\"%s\"\n", interface);
1667
}
1668
return false;
1669
}
1670
1671
return (bool)(ifr.ifr_flags & IFF_UP);
1672
}
1673
1674
/*
1675
* This function determines if a network interface is running
1676
*/
1677
__attribute__((nonnull, warn_unused_result))
1678
bool interface_is_running(const char *interface){
1679
struct ifreq ifr;
1680
if(not get_flags(interface, &ifr)){
1681
if(debug){
1682
fprintf_plus(stderr, "Failed to get flags for interface "
1683
"\"%s\"\n", interface);
1684
}
1685
return false;
1686
}
1687
1688
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1689
}
1690
1691
__attribute__((nonnull, pure, warn_unused_result))
1692
int notdotentries(const struct dirent *direntry){
1693
/* Skip "." and ".." */
1694
if(direntry->d_name[0] == '.'
1695
and (direntry->d_name[1] == '\0'
1696
or (direntry->d_name[1] == '.'
1697
and direntry->d_name[2] == '\0'))){
1698
return 0;
1699
}
1700
return 1;
1701
}
1702
1703
/* Is this directory entry a runnable program? */
1704
__attribute__((nonnull, warn_unused_result))
1705
int runnable_hook(const struct dirent *direntry){
1706
int ret;
1707
size_t sret;
1708
struct stat st;
1709
1710
if((direntry->d_name)[0] == '\0'){
1711
/* Empty name? */
1712
return 0;
1713
}
1714
1715
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1716
"abcdefghijklmnopqrstuvwxyz"
1717
"0123456789"
1718
"_.-");
1719
if((direntry->d_name)[sret] != '\0'){
1720
/* Contains non-allowed characters */
1721
if(debug){
1722
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1723
direntry->d_name);
1724
}
1725
return 0;
1726
}
1727
1728
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1729
if(ret == -1){
1730
if(debug){
1731
perror_plus("Could not stat hook");
1732
}
1733
return 0;
1734
}
1735
if(not (S_ISREG(st.st_mode))){
1736
/* Not a regular file */
1737
if(debug){
1738
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1739
direntry->d_name);
1740
}
1741
return 0;
1742
}
1743
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1744
/* Not executable */
1745
if(debug){
1746
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1747
direntry->d_name);
1748
}
1749
return 0;
1750
}
1751
if(debug){
1752
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1753
direntry->d_name);
1754
}
1755
return 1;
1756
}
1757
1758
__attribute__((nonnull, warn_unused_result))
1759
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1760
mandos_context *mc){
1761
int ret;
1762
struct timespec now;
1763
struct timespec waited_time;
1764
intmax_t block_time;
1765
1766
while(true){
1767
if(mc->current_server == NULL){
1768
if(debug){
1769
fprintf_plus(stderr, "Wait until first server is found."
1770
" No timeout!\n");
1771
}
1772
ret = avahi_simple_poll_iterate(s, -1);
1773
} else {
1774
if(debug){
1775
fprintf_plus(stderr, "Check current_server if we should run"
1776
" it, or wait\n");
1777
}
1778
/* the current time */
1779
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1780
if(ret == -1){
1781
perror_plus("clock_gettime");
1782
return -1;
1783
}
1784
/* Calculating in ms how long time between now and server
1785
who we visted longest time ago. Now - last seen. */
1786
waited_time.tv_sec = (now.tv_sec
1787
- mc->current_server->last_seen.tv_sec);
1788
waited_time.tv_nsec = (now.tv_nsec
1789
- mc->current_server->last_seen.tv_nsec);
1790
/* total time is 10s/10,000ms.
1791
Converting to s from ms by dividing by 1,000,
1792
and ns to ms by dividing by 1,000,000. */
1793
block_time = ((retry_interval
1794
- ((intmax_t)waited_time.tv_sec * 1000))
1795
- ((intmax_t)waited_time.tv_nsec / 1000000));
1796
1797
if(debug){
1798
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1799
block_time);
1800
}
1801
1802
if(block_time <= 0){
1803
ret = start_mandos_communication(mc->current_server->ip,
1804
mc->current_server->port,
1805
mc->current_server->if_index,
1806
mc->current_server->af, mc);
1807
if(ret == 0){
1808
avahi_simple_poll_quit(s);
1809
return 0;
1810
}
1811
ret = clock_gettime(CLOCK_MONOTONIC,
1812
&mc->current_server->last_seen);
1813
if(ret == -1){
1814
perror_plus("clock_gettime");
1815
return -1;
1816
}
1817
mc->current_server = mc->current_server->next;
1818
block_time = 0; /* Call avahi to find new Mandos
1819
servers, but don't block */
1820
}
1821
1822
ret = avahi_simple_poll_iterate(s, (int)block_time);
1823
}
1824
if(ret != 0){
1825
if(ret > 0 or errno != EINTR){
1826
return (ret != 1) ? ret : 0;
1827
}
1828
}
1829
}
1830
}
1831
1832
__attribute__((nonnull))
1833
void run_network_hooks(const char *mode, const char *interface,
1834
const float delay){
1835
struct dirent **direntries = NULL;
1836
if(hookdir_fd == -1){
1837
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1838
| O_CLOEXEC);
1839
if(hookdir_fd == -1){
1840
if(errno == ENOENT){
1841
if(debug){
1842
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1843
" found\n", hookdir);
1844
}
1845
} else {
1846
perror_plus("open");
1847
}
1848
return;
1849
}
1850
}
1851
#ifdef __GLIBC__
1852
#if __GLIBC_PREREQ(2, 15)
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1857
alphasort);
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1861
alphasort);
1862
#endif /* not __GLIBC__ */
1863
if(numhooks == -1){
1864
perror_plus("scandir");
1865
return;
1866
}
1867
struct dirent *direntry;
1868
int ret;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1870
if(devnull == -1){
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1872
return;
1873
}
1874
for(int i = 0; i < numhooks; i++){
1875
direntry = direntries[i];
1876
if(debug){
1877
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1878
direntry->d_name);
1879
}
1880
pid_t hook_pid = fork();
1881
if(hook_pid == 0){
1882
/* Child */
1883
/* Raise privileges */
1884
errno = raise_privileges_permanently();
1885
if(errno != 0){
1886
perror_plus("Failed to raise privileges");
1887
_exit(EX_NOPERM);
1888
}
1889
/* Set group */
1890
errno = 0;
1891
ret = setgid(0);
1892
if(ret == -1){
1893
perror_plus("setgid");
1894
_exit(EX_NOPERM);
1895
}
1896
/* Reset supplementary groups */
1897
errno = 0;
1898
ret = setgroups(0, NULL);
1899
if(ret == -1){
1900
perror_plus("setgroups");
1901
_exit(EX_NOPERM);
1902
}
1903
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1904
if(ret == -1){
1905
perror_plus("setenv");
1906
_exit(EX_OSERR);
1907
}
1908
ret = setenv("DEVICE", interface, 1);
1909
if(ret == -1){
1910
perror_plus("setenv");
1911
_exit(EX_OSERR);
1912
}
1913
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1914
if(ret == -1){
1915
perror_plus("setenv");
1916
_exit(EX_OSERR);
1917
}
1918
ret = setenv("MODE", mode, 1);
1919
if(ret == -1){
1920
perror_plus("setenv");
1921
_exit(EX_OSERR);
1922
}
1923
char *delaystring;
1924
ret = asprintf(&delaystring, "%f", (double)delay);
1925
if(ret == -1){
1926
perror_plus("asprintf");
1927
_exit(EX_OSERR);
1928
}
1929
ret = setenv("DELAY", delaystring, 1);
1930
if(ret == -1){
1931
free(delaystring);
1932
perror_plus("setenv");
1933
_exit(EX_OSERR);
1934
}
1935
free(delaystring);
1936
if(connect_to != NULL){
1937
ret = setenv("CONNECT", connect_to, 1);
1938
if(ret == -1){
1939
perror_plus("setenv");
1940
_exit(EX_OSERR);
1941
}
1942
}
1943
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1944
direntry->d_name,
1945
O_RDONLY));
1946
if(hook_fd == -1){
1947
perror_plus("openat");
1948
_exit(EXIT_FAILURE);
1949
}
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1951
perror_plus("close");
1952
_exit(EXIT_FAILURE);
1953
}
1954
ret = dup2(devnull, STDIN_FILENO);
1955
if(ret == -1){
1956
perror_plus("dup2(devnull, STDIN_FILENO)");
1957
_exit(EX_OSERR);
1958
}
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1960
if(ret == -1){
1961
perror_plus("close");
1962
_exit(EX_OSERR);
1963
}
1964
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1965
if(ret == -1){
1966
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1967
_exit(EX_OSERR);
1968
}
1969
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1970
environ) == -1){
1971
perror_plus("fexecve");
1972
_exit(EXIT_FAILURE);
1973
}
1974
} else {
1975
if(hook_pid == -1){
1976
perror_plus("fork");
1977
free(direntry);
1978
continue;
1979
}
1980
int status;
1981
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1982
perror_plus("waitpid");
1983
free(direntry);
1984
continue;
1985
}
1986
if(WIFEXITED(status)){
1987
if(WEXITSTATUS(status) != 0){
1988
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1989
" with status %d\n", direntry->d_name,
1990
WEXITSTATUS(status));
1991
free(direntry);
1992
continue;
1993
}
1994
} else if(WIFSIGNALED(status)){
1995
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1996
" signal %d\n", direntry->d_name,
1997
WTERMSIG(status));
1998
free(direntry);
1999
continue;
2000
} else {
2001
fprintf_plus(stderr, "Warning: network hook \"%s\""
2002
" crashed\n", direntry->d_name);
2003
free(direntry);
2004
continue;
2005
}
2006
}
2007
if(debug){
2008
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2009
direntry->d_name);
2010
}
2011
free(direntry);
2012
}
2013
free(direntries);
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
perror_plus("close");
2016
} else {
2017
hookdir_fd = -1;
2018
}
2019
close(devnull);
2020
}
2021
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t bring_up_interface(const char *const interface,
2024
const float delay){
2025
error_t old_errno = errno;
2026
int ret;
2027
struct ifreq network;
2028
unsigned int if_index = if_nametoindex(interface);
2029
if(if_index == 0){
2030
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2031
errno = old_errno;
2032
return ENXIO;
2033
}
2034
2035
if(quit_now){
2036
errno = old_errno;
2037
return EINTR;
2038
}
2039
2040
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network)){
2043
ret_errno = errno;
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2046
errno = old_errno;
2047
return ret_errno;
2048
}
2049
network.ifr_flags |= IFF_UP; /* set flag */
2050
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2052
if(sd == -1){
2053
ret_errno = errno;
2054
perror_plus("socket");
2055
errno = old_errno;
2056
return ret_errno;
2057
}
2058
2059
if(quit_now){
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2061
if(ret == -1){
2062
perror_plus("close");
2063
}
2064
errno = old_errno;
2065
return EINTR;
2066
}
2067
2068
if(debug){
2069
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2070
interface);
2071
}
2072
2073
/* Raise privileges */
2074
ret_errno = raise_privileges();
2075
if(ret_errno != 0){
2076
errno = ret_errno;
2077
perror_plus("Failed to raise privileges");
2078
}
2079
2080
#ifdef __linux__
2081
int ret_linux;
2082
bool restore_loglevel = false;
2083
if(ret_errno == 0){
2084
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2085
messages about the network interface to mess up the prompt */
2086
ret_linux = klogctl(8, NULL, 5);
2087
if(ret_linux == -1){
2088
perror_plus("klogctl");
2089
} else {
2090
restore_loglevel = true;
2091
}
2092
}
2093
#endif /* __linux__ */
2094
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2095
ioctl_errno = errno;
2096
#ifdef __linux__
2097
if(restore_loglevel){
2098
ret_linux = klogctl(7, NULL, 0);
2099
if(ret_linux == -1){
2100
perror_plus("klogctl");
2101
}
2102
}
2103
#endif /* __linux__ */
2104
2105
/* If raise_privileges() succeeded above */
2106
if(ret_errno == 0){
2107
/* Lower privileges */
2108
ret_errno = lower_privileges();
2109
if(ret_errno != 0){
2110
errno = ret_errno;
2111
perror_plus("Failed to lower privileges");
2112
}
2113
}
2114
2115
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2117
if(ret == -1){
2118
perror_plus("close");
2119
}
2120
2121
if(ret_setflags == -1){
2122
errno = ioctl_errno;
2123
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2124
errno = old_errno;
2125
return ioctl_errno;
2126
}
2127
} else if(debug){
2128
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2129
interface);
2130
}
2131
2132
/* Sleep checking until interface is running.
2133
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2135
if(interface_is_running(interface)){
2136
break;
2137
}
2138
struct timespec sleeptime = { .tv_nsec = 250000000 };
2139
ret = nanosleep(&sleeptime, NULL);
2140
if(ret == -1 and errno != EINTR){
2141
perror_plus("nanosleep");
2142
}
2143
}
2144
2145
errno = old_errno;
2146
return 0;
2147
}
2148
2149
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2152
struct ifreq network;
2153
unsigned int if_index = if_nametoindex(interface);
2154
if(if_index == 0){
2155
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2156
errno = old_errno;
2157
return ENXIO;
2158
}
2159
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2161
if(not get_flags(interface, &network) and debug){
2162
ret_errno = errno;
2163
fprintf_plus(stderr, "Failed to get flags for interface "
2164
"\"%s\"\n", interface);
2165
errno = old_errno;
2166
return ret_errno;
2167
}
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
2170
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2171
if(sd == -1){
2172
ret_errno = errno;
2173
perror_plus("socket");
2174
errno = old_errno;
2175
return ret_errno;
2176
}
2177
2178
if(debug){
2179
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2180
interface);
2181
}
2182
2183
/* Raise privileges */
2184
ret_errno = raise_privileges();
2185
if(ret_errno != 0){
2186
errno = ret_errno;
2187
perror_plus("Failed to raise privileges");
2188
}
2189
2190
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2191
ioctl_errno = errno;
2192
2193
/* If raise_privileges() succeeded above */
2194
if(ret_errno == 0){
2195
/* Lower privileges */
2196
ret_errno = lower_privileges();
2197
if(ret_errno != 0){
2198
errno = ret_errno;
2199
perror_plus("Failed to lower privileges");
2200
}
2201
}
2202
2203
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2205
if(ret == -1){
2206
perror_plus("close");
2207
}
2208
2209
if(ret_setflags == -1){
2210
errno = ioctl_errno;
2211
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2212
errno = old_errno;
2213
return ioctl_errno;
2214
}
2215
} else if(debug){
2216
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2217
interface);
2218
}
2219
2220
errno = old_errno;
2221
return 0;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
2222
977
}
2223
978
2224
979
int main(int argc, char *argv[]){
2225
mandos_context mc = { .server = NULL, .dh_bits = 0,
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
2229
980
AvahiSServiceBrowser *sb = NULL;
2230
error_t ret_errno;
981
int error;
2231
982
int ret;
2232
983
intmax_t tmpmax;
2233
984
char *tmp;
2234
985
int exitcode = EXIT_SUCCESS;
2235
char *interfaces_to_take_down = NULL;
2236
size_t interfaces_to_take_down_size = 0;
2237
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2238
char old_tempdir[] = "/tmp/mandosXXXXXX";
2239
char *tempdir = NULL;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
993
char tempdir[] = "/tmp/mandosXXXXXX";
994
bool tempdir_created = false;
2240
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
996
const char *seckey = PATHDIR "/" SECKEY;
2242
997
const char *pubkey = PATHDIR "/" PUBKEY;
2243
char *interfaces_hooks = NULL;
2244
998
2245
999
bool gnutls_initialized = false;
2246
1000
bool gpgme_initialized = false;
2247
1001
float delay = 2.5f;
2248
double retry_interval = 10; /* 10s between trying a server and
2249
retrying the same server again */
2250
1002
2251
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2252
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2258
1010
errno = 0;
2259
1011
ret = setgid(gid);
2260
1012
if(ret == -1){
2261
perror_plus("setgid");
1013
perror("setgid");
2262
1014
}
2263
1015
2264
1016
/* Lower user privileges (temporarily) */
2265
1017
errno = 0;
2266
1018
ret = seteuid(uid);
2267
1019
if(ret == -1){
2268
perror_plus("seteuid");
1020
perror("seteuid");
2269
1021
}
2270
1022
2271
1023
if(quit_now){
2306
1058
.arg = "SECONDS",
2307
1059
.doc = "Maximum delay to wait for interface startup",
2308
1060
.group = 2 },
2309
{ .name = "retry", .key = 132,
2310
.arg = "SECONDS",
2311
.doc = "Retry interval used when denied by the Mandos server",
2312
.group = 2 },
2313
{ .name = "network-hook-dir", .key = 133,
2314
.arg = "DIR",
2315
.doc = "Directory where network hooks are located",
2316
.group = 2 },
2317
/*
2318
* These reproduce what we would get without ARGP_NO_HELP
2319
*/
2320
{ .name = "help", .key = '?',
2321
.doc = "Give this help list", .group = -1 },
2322
{ .name = "usage", .key = -3,
2323
.doc = "Give a short usage message", .group = -1 },
2324
{ .name = "version", .key = 'V',
2325
.doc = "Print program version", .group = -1 },
2326
1061
{ .name = NULL }
2327
1062
};
2328
1063
2329
1064
error_t parse_opt(int key, char *arg,
2330
1065
struct argp_state *state){
2331
errno = 0;
2332
1066
switch(key){
2333
1067
case 128: /* --debug */
2334
1068
debug = true;
2337
1071
connect_to = arg;
2338
1072
break;
2339
1073
case 'i': /* --interface */
2340
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2341
arg, (int)',');
2342
if(ret_errno != 0){
2343
argp_error(state, "%s", strerror(ret_errno));
2344
}
1074
interface = arg;
2345
1075
break;
2346
1076
case 's': /* --seckey */
2347
1077
seckey = arg;
2354
1084
tmpmax = strtoimax(arg, &tmp, 10);
2355
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
2356
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2357
argp_error(state, "Bad number of DH bits");
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
2358
1089
}
2359
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2360
1091
break;
2365
1096
errno = 0;
2366
1097
delay = strtof(arg, &tmp);
2367
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
2368
argp_error(state, "Bad delay");
2369
}
2370
case 132: /* --retry */
2371
errno = 0;
2372
retry_interval = strtod(arg, &tmp);
2373
if(errno != 0 or tmp == arg or *tmp != '\0'
2374
or (retry_interval * 1000) > INT_MAX
2375
or retry_interval < 0){
2376
argp_error(state, "Bad retry interval");
2377
}
2378
break;
2379
case 133: /* --network-hook-dir */
2380
hookdir = arg;
2381
break;
2382
/*
2383
* These reproduce what we would get without ARGP_NO_HELP
2384
*/
2385
case '?': /* --help */
2386
argp_state_help(state, state->out_stream,
2387
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2388
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2389
case -3: /* --usage */
2390
argp_state_help(state, state->out_stream,
2391
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2392
case 'V': /* --version */
2393
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2394
exit(argp_err_exit_status);
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
2395
1106
break;
2396
1107
default:
2397
1108
return ARGP_ERR_UNKNOWN;
2398
1109
}
2399
return errno;
1110
return 0;
2400
1111
}
2401
1112
2402
1113
struct argp argp = { .options = options, .parser = parse_opt,
2403
1114
.args_doc = "",
2404
1115
.doc = "Mandos client -- Get and decrypt"
2405
1116
" passwords from a Mandos server" };
2406
ret = argp_parse(&argp, argc, argv,
2407
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2408
switch(ret){
2409
case 0:
2410
break;
2411
case ENOMEM:
2412
default:
2413
errno = ret;
2414
perror_plus("argp_parse");
2415
exitcode = EX_OSERR;
2416
goto end;
2417
case EINVAL:
2418
exitcode = EX_USAGE;
2419
goto end;
2420
}
2421
}
2422
2423
{
2424
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
2426
2427
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2431
perror_plus("Failed to raise privileges");
2432
} else {
2433
struct stat st;
2434
2435
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2436
int seckey_fd = open(seckey, O_RDONLY);
2437
if(seckey_fd == -1){
2438
perror_plus("open");
2439
} else {
2440
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2441
if(ret == -1){
2442
perror_plus("fstat");
2443
} else {
2444
if(S_ISREG(st.st_mode)
2445
and st.st_uid == 0 and st.st_gid == 0){
2446
ret = fchown(seckey_fd, uid, gid);
2447
if(ret == -1){
2448
perror_plus("fchown");
2449
}
2450
}
2451
}
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2453
}
2454
}
2455
2456
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2457
int pubkey_fd = open(pubkey, O_RDONLY);
2458
if(pubkey_fd == -1){
2459
perror_plus("open");
2460
} else {
2461
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2462
if(ret == -1){
2463
perror_plus("fstat");
2464
} else {
2465
if(S_ISREG(st.st_mode)
2466
and st.st_uid == 0 and st.st_gid == 0){
2467
ret = fchown(pubkey_fd, uid, gid);
2468
if(ret == -1){
2469
perror_plus("fchown");
2470
}
2471
}
2472
}
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2474
}
2475
}
2476
2477
/* Lower privileges */
2478
ret_errno = lower_privileges();
2479
if(ret_errno != 0){
2480
errno = ret_errno;
2481
perror_plus("Failed to lower privileges");
2482
}
2483
}
2484
}
2485
2486
/* Remove invalid interface names (except "none") */
2487
{
2488
char *interface = NULL;
2489
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2490
interface))){
2491
if(strcmp(interface, "none") != 0
2492
and if_nametoindex(interface) == 0){
2493
if(interface[0] != '\0'){
2494
fprintf_plus(stderr, "Not using nonexisting interface"
2495
" \"%s\"\n", interface);
2496
}
2497
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2498
interface = NULL;
2499
}
2500
}
2501
}
2502
2503
/* Run network hooks */
2504
{
2505
if(mc.interfaces != NULL){
2506
interfaces_hooks = malloc(mc.interfaces_size);
2507
if(interfaces_hooks == NULL){
2508
perror_plus("malloc");
2509
goto end;
2510
}
2511
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2512
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2513
}
2514
run_network_hooks("start", interfaces_hooks != NULL ?
2515
interfaces_hooks : "", delay);
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
2516
1123
}
2517
1124
2518
1125
if(not debug){
2523
1130
from the signal handler */
2524
1131
/* Initialize the pseudo-RNG for Avahi */
2525
1132
srand((unsigned int) time(NULL));
2526
simple_poll = avahi_simple_poll_new();
2527
if(simple_poll == NULL){
2528
fprintf_plus(stderr,
2529
"Avahi: Failed to create simple poll object.\n");
2530
exitcode = EX_UNAVAILABLE;
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
2531
1137
goto end;
2532
1138
}
2533
1139
2534
1140
sigemptyset(&sigterm_action.sa_mask);
2535
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2536
1142
if(ret == -1){
2537
perror_plus("sigaddset");
2538
exitcode = EX_OSERR;
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
2539
1145
goto end;
2540
1146
}
2541
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2542
1148
if(ret == -1){
2543
perror_plus("sigaddset");
2544
exitcode = EX_OSERR;
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
2545
1151
goto end;
2546
1152
}
2547
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2548
1154
if(ret == -1){
2549
perror_plus("sigaddset");
2550
exitcode = EX_OSERR;
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
2551
1157
goto end;
2552
1158
}
2553
1159
/* Need to check if the handler is SIG_IGN before handling:
2556
1162
*/
2557
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2558
1164
if(ret == -1){
2559
perror_plus("sigaction");
2560
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2561
1167
}
2562
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
2563
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
2564
1170
if(ret == -1){
2565
perror_plus("sigaction");
2566
exitcode = EX_OSERR;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
2567
1173
goto end;
2568
1174
}
2569
1175
}
2570
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2571
1177
if(ret == -1){
2572
perror_plus("sigaction");
2573
return EX_OSERR;
1178
perror("sigaction");
1179
return EXIT_FAILURE;
2574
1180
}
2575
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
2576
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2577
1183
if(ret == -1){
2578
perror_plus("sigaction");
2579
exitcode = EX_OSERR;
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
2580
1186
goto end;
2581
1187
}
2582
1188
}
2583
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2584
1190
if(ret == -1){
2585
perror_plus("sigaction");
2586
return EX_OSERR;
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2587
1193
}
2588
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
2589
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2590
1196
if(ret == -1){
2591
perror_plus("sigaction");
2592
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
2593
1199
goto end;
2594
1200
}
2595
1201
}
2596
1202
2597
/* If no interfaces were specified, make a list */
2598
if(mc.interfaces == NULL){
2599
struct dirent **direntries = NULL;
2600
/* Look for any good interfaces */
2601
ret = scandir(sys_class_net, &direntries, good_interface,
2602
alphasort);
2603
if(ret >= 1){
2604
/* Add all found interfaces to interfaces list */
2605
for(int i = 0; i < ret; ++i){
2606
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2607
direntries[i]->d_name);
2608
if(ret_errno != 0){
2609
errno = ret_errno;
2610
perror_plus("argz_add");
2611
free(direntries[i]);
2612
continue;
2613
}
2614
if(debug){
2615
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2616
direntries[i]->d_name);
2617
}
2618
free(direntries[i]);
2619
}
2620
free(direntries);
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
if(if_index == 0){
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
1288
}
1289
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
break;
1307
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
2621
1338
} else {
2622
if(ret == 0){
2623
free(direntries);
2624
}
2625
fprintf_plus(stderr, "Could not find a network interface\n");
2626
exitcode = EXIT_FAILURE;
2627
goto end;
2628
}
2629
}
2630
2631
/* Bring up interfaces which are down, and remove any "none"s */
2632
{
2633
char *interface = NULL;
2634
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2635
interface))){
2636
/* If interface name is "none", stop bringing up interfaces.
2637
Also remove all instances of "none" from the list */
2638
if(strcmp(interface, "none") == 0){
2639
argz_delete(&mc.interfaces, &mc.interfaces_size,
2640
interface);
2641
interface = NULL;
2642
while((interface = argz_next(mc.interfaces,
2643
mc.interfaces_size, interface))){
2644
if(strcmp(interface, "none") == 0){
2645
argz_delete(&mc.interfaces, &mc.interfaces_size,
2646
interface);
2647
interface = NULL;
2648
}
2649
}
2650
break;
2651
}
2652
bool interface_was_up = interface_is_up(interface);
2653
errno = bring_up_interface(interface, delay);
2654
if(not interface_was_up){
2655
if(errno != 0){
2656
perror_plus("Failed to bring up interface");
2657
} else {
2658
errno = argz_add(&interfaces_to_take_down,
2659
&interfaces_to_take_down_size,
2660
interface);
2661
if(errno != 0){
2662
perror_plus("argz_add");
2663
}
2664
}
2665
}
2666
}
2667
if(debug and (interfaces_to_take_down == NULL)){
2668
fprintf_plus(stderr, "No interfaces were brought up\n");
2669
}
2670
}
2671
2672
/* If we only got one interface, explicitly use only that one */
2673
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2674
if(debug){
2675
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2676
mc.interfaces);
2677
}
2678
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
2679
1345
}
2680
1346
2681
1347
if(quit_now){
2682
1348
goto end;
2683
1349
}
2684
1350
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
1351
ret = init_gnutls_global(pubkey, seckey);
2686
1352
if(ret == -1){
2687
fprintf_plus(stderr, "init_gnutls_global failed\n");
2688
exitcode = EX_UNAVAILABLE;
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
2689
1355
goto end;
2690
1356
} else {
2691
1357
gnutls_initialized = true;
2695
1361
goto end;
2696
1362
}
2697
1363
2698
/* Try /run/tmp before /tmp */
2699
tempdir = mkdtemp(run_tempdir);
2700
if(tempdir == NULL and errno == ENOENT){
2701
if(debug){
2702
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2703
run_tempdir, old_tempdir);
2704
}
2705
tempdir = mkdtemp(old_tempdir);
2706
}
2707
if(tempdir == NULL){
2708
perror_plus("mkdtemp");
1364
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
2709
1368
goto end;
2710
1369
}
2711
1370
2713
1372
goto end;
2714
1373
}
2715
1374
2716
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2717
fprintf_plus(stderr, "init_gpgme failed\n");
2718
exitcode = EX_UNAVAILABLE;
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
2719
1378
goto end;
2720
1379
} else {
2721
1380
gpgme_initialized = true;
2729
1388
/* Connect directly, do not use Zeroconf */
2730
1389
/* (Mainly meant for debugging) */
2731
1390
char *address = strrchr(connect_to, ':');
2732
2733
1391
if(address == NULL){
2734
fprintf_plus(stderr, "No colon in address\n");
2735
exitcode = EX_USAGE;
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
2736
1394
goto end;
2737
1395
}
2738
1396
2740
1398
goto end;
2741
1399
}
2742
1400
2743
in_port_t port;
1401
uint16_t port;
2744
1402
errno = 0;
2745
1403
tmpmax = strtoimax(address+1, &tmp, 10);
2746
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2747
or tmpmax != (in_port_t)tmpmax){
2748
fprintf_plus(stderr, "Bad port number\n");
2749
exitcode = EX_USAGE;
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
2750
1408
goto end;
2751
1409
}
2752
1410
2753
1411
if(quit_now){
2754
1412
goto end;
2755
1413
}
2756
1414
2757
port = (in_port_t)tmpmax;
1415
port = (uint16_t)tmpmax;
2758
1416
*address = '\0';
1417
address = connect_to;
2759
1418
/* Colon in address indicates IPv6 */
2760
1419
int af;
2761
if(strchr(connect_to, ':') != NULL){
1420
if(strchr(address, ':') != NULL){
2762
1421
af = AF_INET6;
2763
/* Accept [] around IPv6 address - see RFC 5952 */
2764
if(connect_to[0] == '[' and address[-1] == ']')
2765
{
2766
connect_to++;
2767
address[-1] = '\0';
2768
}
2769
1422
} else {
2770
1423
af = AF_INET;
2771
1424
}
2772
address = connect_to;
2773
1425
2774
1426
if(quit_now){
2775
1427
goto end;
2776
1428
}
2777
1429
2778
while(not quit_now){
2779
ret = start_mandos_communication(address, port, if_index, af,
2780
&mc);
2781
if(quit_now or ret == 0){
2782
break;
2783
}
2784
if(debug){
2785
fprintf_plus(stderr, "Retrying in %d seconds\n",
2786
(int)retry_interval);
2787
}
2788
sleep((unsigned int)retry_interval);
2789
}
2790
2791
if(not quit_now){
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
2792
1434
exitcode = EXIT_SUCCESS;
2793
1435
}
2794
2795
1436
goto end;
2796
1437
}
2797
1438
2809
1450
config.publish_domain = 0;
2810
1451
2811
1452
/* Allocate a new server */
2812
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
2814
1456
2815
1457
/* Free the Avahi configuration data */
2816
1458
avahi_server_config_free(&config);
2818
1460
2819
1461
/* Check if creating the Avahi server object succeeded */
2820
1462
if(mc.server == NULL){
2821
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2822
avahi_strerror(ret_errno));
2823
exitcode = EX_UNAVAILABLE;
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
2824
1466
goto end;
2825
1467
}
2826
1468
2831
1473
/* Create the Avahi service browser */
2832
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
2833
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2834
NULL, 0, browse_callback,
2835
(void *)&mc);
1476
NULL, 0, browse_callback, NULL);
2836
1477
if(sb == NULL){
2837
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2838
avahi_strerror(avahi_server_errno(mc.server)));
2839
exitcode = EX_UNAVAILABLE;
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
2840
1481
goto end;
2841
1482
}
2842
1483
2847
1488
/* Run the main loop */
2848
1489
2849
1490
if(debug){
2850
fprintf_plus(stderr, "Starting Avahi loop search\n");
1491
fprintf(stderr, "Starting Avahi loop search\n");
2851
1492
}
2852
1493
2853
ret = avahi_loop_with_timeout(simple_poll,
2854
(int)(retry_interval * 1000), &mc);
2855
if(debug){
2856
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2857
(ret == 0) ? "successfully" : "with error");
2858
}
1494
avahi_simple_poll_loop(mc.simple_poll);
2859
1495
2860
1496
end:
2861
1497
2862
1498
if(debug){
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1499
fprintf(stderr, "%s exiting\n", argv[0]);
2864
1500
}
2865
1501
2866
1502
/* Cleanup things */
2867
free(mc.interfaces);
2868
2869
1503
if(sb != NULL)
2870
1504
avahi_s_service_browser_free(sb);
2871
1505
2872
1506
if(mc.server != NULL)
2873
1507
avahi_server_free(mc.server);
2874
1508
2875
if(simple_poll != NULL)
2876
avahi_simple_poll_free(simple_poll);
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
2877
1511
2878
1512
if(gnutls_initialized){
2879
1513
gnutls_certificate_free_credentials(mc.cred);
2885
1519
gpgme_release(mc.ctx);
2886
1520
}
2887
1521
2888
/* Cleans up the circular linked list of Mandos servers the client
2889
has seen */
2890
if(mc.current_server != NULL){
2891
mc.current_server->prev->next = NULL;
2892
while(mc.current_server != NULL){
2893
server *next = mc.current_server->next;
2894
#ifdef __GNUC__
2895
#pragma GCC diagnostic push
2896
#pragma GCC diagnostic ignored "-Wcast-qual"
2897
#endif
2898
free((char *)(mc.current_server->ip));
2899
#ifdef __GNUC__
2900
#pragma GCC diagnostic pop
2901
#endif
2902
free(mc.current_server);
2903
mc.current_server = next;
2904
}
2905
}
2906
2907
/* Re-raise privileges */
2908
{
2909
ret_errno = raise_privileges();
2910
if(ret_errno != 0){
2911
errno = ret_errno;
2912
perror_plus("Failed to raise privileges");
2913
} else {
2914
2915
/* Run network hooks */
2916
run_network_hooks("stop", interfaces_hooks != NULL ?
2917
interfaces_hooks : "", delay);
2918
2919
/* Take down the network interfaces which were brought up */
2920
{
2921
char *interface = NULL;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2924
interface))){
2925
ret_errno = take_down_interface(interface);
2926
if(ret_errno != 0){
2927
errno = ret_errno;
2928
perror_plus("Failed to take down interface");
2929
}
2930
}
2931
if(debug and (interfaces_to_take_down == NULL)){
2932
fprintf_plus(stderr, "No interfaces needed to be taken"
2933
" down\n");
2934
}
2935
}
2936
}
2937
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
2941
perror_plus("Failed to lower privileges permanently");
2942
}
2943
}
2944
2945
free(interfaces_to_take_down);
2946
free(interfaces_hooks);
2947
2948
/* Removes the GPGME temp directory and all files inside */
2949
if(tempdir != NULL){
2950
struct dirent **direntries = NULL;
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2952
| O_NOFOLLOW
2953
| O_DIRECTORY
2954
| O_PATH));
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2957
} else {
2958
#ifdef __GLIBC__
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2964
alphasort);
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2968
alphasort);
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2973
if(ret == -1){
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2977
}
2978
free(direntries[i]);
2979
}
2980
2981
/* need to clean even if 0 because man page doesn't specify */
2982
free(direntries);
2983
if(numentries == -1){
2984
perror_plus("scandir");
2985
}
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
2989
}
2990
}
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
1551
}
1552
}
1553
1554
/* Removes the temp directory used by GPGME */
1555
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
1576
char *fullname = NULL;
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
direntry->d_name);
1579
if(ret < 0){
1580
perror("asprintf");
1581
continue;
1582
}
1583
ret = remove(fullname);
1584
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
1587
}
1588
free(fullname);
1589
}
1590
closedir(d);
1591
}
1592
ret = rmdir(tempdir);
1593
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
2992
1595
}
2993
1596
}
2994
1597
2995
1598
if(quit_now){
2996
1599
sigemptyset(&old_sigterm_action.sa_mask);
2997
1600
old_sigterm_action.sa_handler = SIG_DFL;
2998
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2999
&old_sigterm_action,
3000
NULL));
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
3001
1602
if(ret == -1){
3002
perror_plus("sigaction");
3003
}
3004
do {
3005
ret = raise(signal_received);
3006
} while(ret != 0 and errno == EINTR);
3007
if(ret != 0){
3008
perror_plus("raise");
3009
abort();
3010
}
3011
TEMP_FAILURE_RETRY(pause());
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
3012
1606
}
3013
1607
3014
1608
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0