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- Committer: Teddy Hogeborn
- Date: 2014-03-23 19:24:40 UTC
- Revision ID: teddy@recompile.se-20140323192440-d71iiqxebsxf9u2v
Update GCC warning flags and function attributes to GCC 4.7.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
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* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
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* along with this program. If not, see
27
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* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
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42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
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stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
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#include <stdbool.h> /* bool, false, true */
49
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#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
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sockaddr_in6, PF_INET6,
54
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SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
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sigaction(), SIGTERM, sig_atomic_t,
84
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
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#ifdef __linux__
87
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#include <sys/klog.h> /* klogctl() */
105
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init_gnutls_session(),
106
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GNUTLS_* */
107
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#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
110
122
111
123
/* GPGME */
112
124
#include <gpgme.h> /* All GPGME types, constants and
120
132
#define PATHDIR "/conf/conf.d/mandos"
121
133
#define SECKEY "seckey.txt"
122
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
136
124
137
bool debug = false;
125
138
static const char mandos_protocol_version[] = "1";
126
139
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
150
in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
128
157
129
158
/* Used for passing in values through the Avahi callback functions */
130
159
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
160
AvahiServer *server;
133
161
gnutls_certificate_credentials_t cred;
134
162
unsigned int dh_bits;
135
163
gnutls_dh_params_t dh_params;
136
164
const char *priority;
137
165
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
138
169
} mandos_context;
139
170
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" };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
144
173
145
174
sig_atomic_t quit_now = 0;
146
175
int signal_received = 0;
147
176
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
148
196
/*
149
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
198
* bytes. "buffer_capacity" is how much is currently allocated,
151
199
* "buffer_length" is how much is already used.
152
200
*/
201
__attribute__((nonnull, warn_unused_result))
153
202
size_t incbuffer(char **buffer, size_t buffer_length,
154
size_t buffer_capacity){
203
size_t buffer_capacity){
155
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
158
211
return 0;
159
212
}
213
*buffer = new_buf;
160
214
buffer_capacity += BUFFER_SIZE;
161
215
}
162
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return buffer_capacity;
163
217
}
164
218
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
223
int ret;
224
server *new_server = malloc(sizeof(server));
225
if(new_server == NULL){
226
perror_plus("malloc");
227
return false;
228
}
229
*new_server = (server){ .ip = strdup(ip),
230
.port = port,
231
.if_index = if_index,
232
.af = af };
233
if(new_server->ip == NULL){
234
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
/* Special case of first server */
243
if(*current_server == NULL){
244
new_server->next = new_server;
245
new_server->prev = new_server;
246
*current_server = new_server;
247
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
251
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
255
}
256
165
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/*
166
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* Initialize GPGME.
167
259
*/
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char *seckey, const char *pubkey,
262
const char *tempdir, mandos_context *mc){
170
263
gpgme_error_t rc;
171
264
gpgme_engine_info_t engine_info;
172
265
173
174
266
/*
175
267
* Helper function to insert pub and seckey to the engine keyring.
176
268
*/
181
273
182
274
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
183
275
if(fd == -1){
184
perror("open");
276
perror_plus("open");
185
277
return false;
186
278
}
187
279
188
280
rc = gpgme_data_new_from_fd(&pgp_data, fd);
189
281
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
192
284
return false;
193
285
}
194
286
195
rc = gpgme_op_import(mc.ctx, pgp_data);
287
rc = gpgme_op_import(mc->ctx, pgp_data);
196
288
if(rc != GPG_ERR_NO_ERROR){
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
199
291
return false;
200
292
}
201
293
202
294
ret = (int)TEMP_FAILURE_RETRY(close(fd));
203
295
if(ret == -1){
204
perror("close");
296
perror_plus("close");
205
297
}
206
298
gpgme_data_release(pgp_data);
207
299
return true;
208
300
}
209
301
210
302
if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
303
fprintf_plus(stderr, "Initializing GPGME\n");
212
304
}
213
305
214
306
/* Init GPGME */
215
307
gpgme_check_version(NULL);
216
308
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
217
309
if(rc != GPG_ERR_NO_ERROR){
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
310
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
220
312
return false;
221
313
}
222
314
223
/* Set GPGME home directory for the OpenPGP engine only */
315
/* Set GPGME home directory for the OpenPGP engine only */
224
316
rc = gpgme_get_engine_info(&engine_info);
225
317
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
318
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
319
gpgme_strsource(rc), gpgme_strerror(rc));
228
320
return false;
229
321
}
230
322
while(engine_info != NULL){
236
328
engine_info = engine_info->next;
237
329
}
238
330
if(engine_info == NULL){
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
331
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
332
tempdir);
240
333
return false;
241
334
}
242
335
243
336
/* Create new GPGME "context" */
244
rc = gpgme_new(&(mc.ctx));
337
rc = gpgme_new(&(mc->ctx));
245
338
if(rc != GPG_ERR_NO_ERROR){
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
339
fprintf_plus(stderr, "Mandos plugin mandos-client: "
340
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
341
gpgme_strerror(rc));
248
342
return false;
249
343
}
250
344
259
353
* Decrypt OpenPGP data.
260
354
* Returns -1 on error
261
355
*/
356
__attribute__((nonnull, warn_unused_result))
262
357
static ssize_t pgp_packet_decrypt(const char *cryptotext,
263
358
size_t crypto_size,
264
char **plaintext){
359
char **plaintext,
360
mandos_context *mc){
265
361
gpgme_data_t dh_crypto, dh_plain;
266
362
gpgme_error_t rc;
267
363
ssize_t ret;
269
365
ssize_t plaintext_length = 0;
270
366
271
367
if(debug){
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
368
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
273
369
}
274
370
275
371
/* Create new GPGME data buffer from memory cryptotext */
276
372
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
277
373
0);
278
374
if(rc != GPG_ERR_NO_ERROR){
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
375
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
281
377
return -1;
282
378
}
283
379
284
380
/* Create new empty GPGME data buffer for the plaintext */
285
381
rc = gpgme_data_new(&dh_plain);
286
382
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
383
fprintf_plus(stderr, "Mandos plugin mandos-client: "
384
"bad gpgme_data_new: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
289
386
gpgme_data_release(dh_crypto);
290
387
return -1;
291
388
}
292
389
293
390
/* Decrypt data from the cryptotext data buffer to the plaintext
294
391
data buffer */
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
392
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
296
393
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
394
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
299
396
plaintext_length = -1;
300
397
if(debug){
301
398
gpgme_decrypt_result_t result;
302
result = gpgme_op_decrypt_result(mc.ctx);
399
result = gpgme_op_decrypt_result(mc->ctx);
303
400
if(result == NULL){
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
401
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
305
402
} else {
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
403
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
404
result->unsupported_algorithm);
405
fprintf_plus(stderr, "Wrong key usage: %u\n",
406
result->wrong_key_usage);
310
407
if(result->file_name != NULL){
311
fprintf(stderr, "File name: %s\n", result->file_name);
408
fprintf_plus(stderr, "File name: %s\n", result->file_name);
312
409
}
313
410
gpgme_recipient_t recipient;
314
411
recipient = result->recipients;
315
412
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
413
fprintf_plus(stderr, "Public key algorithm: %s\n",
414
gpgme_pubkey_algo_name
415
(recipient->pubkey_algo));
416
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
417
fprintf_plus(stderr, "Secret key available: %s\n",
418
recipient->status == GPG_ERR_NO_SECKEY
419
? "No" : "Yes");
322
420
recipient = recipient->next;
323
421
}
324
422
}
327
425
}
328
426
329
427
if(debug){
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
428
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
331
429
}
332
430
333
431
/* Seek back to the beginning of the GPGME plaintext data buffer */
334
432
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
335
perror("gpgme_data_seek");
433
perror_plus("gpgme_data_seek");
336
434
plaintext_length = -1;
337
435
goto decrypt_end;
338
436
}
340
438
*plaintext = NULL;
341
439
while(true){
342
440
plaintext_capacity = incbuffer(plaintext,
343
(size_t)plaintext_length,
344
plaintext_capacity);
441
(size_t)plaintext_length,
442
plaintext_capacity);
345
443
if(plaintext_capacity == 0){
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
444
perror_plus("incbuffer");
445
plaintext_length = -1;
446
goto decrypt_end;
349
447
}
350
448
351
449
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
454
break;
357
455
}
358
456
if(ret < 0){
359
perror("gpgme_data_read");
457
perror_plus("gpgme_data_read");
360
458
plaintext_length = -1;
361
459
goto decrypt_end;
362
460
}
364
462
}
365
463
366
464
if(debug){
367
fprintf(stderr, "Decrypted password is: ");
465
fprintf_plus(stderr, "Decrypted password is: ");
368
466
for(ssize_t i = 0; i < plaintext_length; i++){
369
467
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
370
468
}
381
479
return plaintext_length;
382
480
}
383
481
384
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
484
const char *ret = gnutls_strerror(value);
387
485
if(ret == NULL)
388
486
ret = "(unknown)";
389
487
return ret;
390
488
}
391
489
392
490
/* GnuTLS log function callback */
491
__attribute__((nonnull))
393
492
static void debuggnutls(__attribute__((unused)) int level,
394
493
const char* string){
395
fprintf(stderr, "GnuTLS: %s", string);
494
fprintf_plus(stderr, "GnuTLS: %s", string);
396
495
}
397
496
497
__attribute__((nonnull, warn_unused_result))
398
498
static int init_gnutls_global(const char *pubkeyfilename,
399
const char *seckeyfilename){
499
const char *seckeyfilename,
500
mandos_context *mc){
400
501
int ret;
401
502
402
503
if(debug){
403
fprintf(stderr, "Initializing GnuTLS\n");
504
fprintf_plus(stderr, "Initializing GnuTLS\n");
404
505
}
405
506
406
507
ret = gnutls_global_init();
407
508
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
509
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
510
safer_gnutls_strerror(ret));
410
511
return -1;
411
512
}
412
513
419
520
}
420
521
421
522
/* OpenPGP credentials */
422
gnutls_certificate_allocate_credentials(&mc.cred);
523
ret = gnutls_certificate_allocate_credentials(&mc->cred);
423
524
if(ret != GNUTLS_E_SUCCESS){
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
525
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
526
safer_gnutls_strerror(ret));
429
527
gnutls_global_deinit();
430
528
return -1;
431
529
}
432
530
433
531
if(debug){
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
532
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
533
" secret key %s as GnuTLS credentials\n",
534
pubkeyfilename,
535
seckeyfilename);
437
536
}
438
537
439
538
ret = gnutls_certificate_set_openpgp_key_file
440
(mc.cred, pubkeyfilename, seckeyfilename,
539
(mc->cred, pubkeyfilename, seckeyfilename,
441
540
GNUTLS_OPENPGP_FMT_BASE64);
442
541
if(ret != GNUTLS_E_SUCCESS){
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr,
543
"Error[%d] while reading the OpenPGP key pair ('%s',"
544
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
545
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
546
safer_gnutls_strerror(ret));
448
547
goto globalfail;
449
548
}
450
549
451
550
/* GnuTLS server initialization */
452
ret = gnutls_dh_params_init(&mc.dh_params);
551
ret = gnutls_dh_params_init(&mc->dh_params);
453
552
if(ret != GNUTLS_E_SUCCESS){
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
553
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
554
" initialization: %s\n",
555
safer_gnutls_strerror(ret));
456
556
goto globalfail;
457
557
}
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
558
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
459
559
if(ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
560
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
561
safer_gnutls_strerror(ret));
462
562
goto globalfail;
463
563
}
464
564
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
565
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
466
566
467
567
return 0;
468
568
469
569
globalfail:
470
570
471
gnutls_certificate_free_credentials(mc.cred);
571
gnutls_certificate_free_credentials(mc->cred);
472
572
gnutls_global_deinit();
473
gnutls_dh_params_deinit(mc.dh_params);
573
gnutls_dh_params_deinit(mc->dh_params);
474
574
return -1;
475
575
}
476
576
477
static int init_gnutls_session(gnutls_session_t *session){
577
__attribute__((nonnull, warn_unused_result))
578
static int init_gnutls_session(gnutls_session_t *session,
579
mandos_context *mc){
478
580
int ret;
479
581
/* GnuTLS session creation */
480
582
do {
484
586
}
485
587
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
588
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
589
fprintf_plus(stderr,
590
"Error in GnuTLS session initialization: %s\n",
591
safer_gnutls_strerror(ret));
489
592
}
490
593
491
594
{
492
595
const char *err;
493
596
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
597
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
495
598
if(quit_now){
496
599
gnutls_deinit(*session);
497
600
return -1;
498
601
}
499
602
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
500
603
if(ret != GNUTLS_E_SUCCESS){
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
604
fprintf_plus(stderr, "Syntax error at: %s\n", err);
605
fprintf_plus(stderr, "GnuTLS error: %s\n",
606
safer_gnutls_strerror(ret));
504
607
gnutls_deinit(*session);
505
608
return -1;
506
609
}
508
611
509
612
do {
510
613
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
614
mc->cred);
512
615
if(quit_now){
513
616
gnutls_deinit(*session);
514
617
return -1;
515
618
}
516
619
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
517
620
if(ret != GNUTLS_E_SUCCESS){
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
621
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
622
safer_gnutls_strerror(ret));
520
623
gnutls_deinit(*session);
521
624
return -1;
522
625
}
524
627
/* ignore client certificate if any. */
525
628
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
526
629
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
630
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
528
631
529
632
return 0;
530
633
}
534
637
__attribute__((unused)) const char *txt){}
535
638
536
639
/* Called when a Mandos server is found */
537
static int start_mandos_communication(const char *ip, uint16_t port,
640
__attribute__((nonnull, warn_unused_result))
641
static int start_mandos_communication(const char *ip, in_port_t port,
538
642
AvahiIfIndex if_index,
539
int af){
643
int af, mandos_context *mc){
540
644
int ret, tcp_sd = -1;
541
645
ssize_t sret;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
646
struct sockaddr_storage to;
546
647
char *buffer = NULL;
547
648
char *decrypted_buffer = NULL;
548
649
size_t buffer_length = 0;
552
653
gnutls_session_t session;
553
654
int pf; /* Protocol family */
554
655
656
errno = 0;
657
555
658
if(quit_now){
659
errno = EINTR;
556
660
return -1;
557
661
}
558
662
564
668
pf = PF_INET;
565
669
break;
566
670
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
671
fprintf_plus(stderr, "Bad address family: %d\n", af);
672
errno = EINVAL;
568
673
return -1;
569
674
}
570
675
571
ret = init_gnutls_session(&session);
676
/* If the interface is specified and we have a list of interfaces */
677
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
678
/* Check if the interface is one of the interfaces we are using */
679
bool match = false;
680
{
681
char *interface = NULL;
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
684
if(if_nametoindex(interface) == (unsigned int)if_index){
685
match = true;
686
break;
687
}
688
}
689
}
690
if(not match){
691
/* This interface does not match any in the list, so we don't
692
connect to the server */
693
if(debug){
694
char interface[IF_NAMESIZE];
695
if(if_indextoname((unsigned int)if_index, interface) == NULL){
696
perror_plus("if_indextoname");
697
} else {
698
fprintf_plus(stderr, "Skipping server on non-used interface"
699
" \"%s\"\n",
700
if_indextoname((unsigned int)if_index,
701
interface));
702
}
703
}
704
return -1;
705
}
706
}
707
708
ret = init_gnutls_session(&session, mc);
572
709
if(ret != 0){
573
710
return -1;
574
711
}
575
712
576
713
if(debug){
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
714
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
715
PRIuMAX "\n", ip, (uintmax_t)port);
579
716
}
580
717
581
718
tcp_sd = socket(pf, SOCK_STREAM, 0);
582
719
if(tcp_sd < 0){
583
perror("socket");
720
int e = errno;
721
perror_plus("socket");
722
errno = e;
584
723
goto mandos_end;
585
724
}
586
725
587
726
if(quit_now){
727
errno = EINTR;
588
728
goto mandos_end;
589
729
}
590
730
591
731
memset(&to, 0, sizeof(to));
592
732
if(af == AF_INET6){
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
595
735
} else { /* IPv4 */
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
598
738
}
599
739
if(ret < 0 ){
600
perror("inet_pton");
740
int e = errno;
741
perror_plus("inet_pton");
742
errno = e;
601
743
goto mandos_end;
602
744
}
603
745
if(ret == 0){
604
fprintf(stderr, "Bad address: %s\n", ip);
746
int e = errno;
747
fprintf_plus(stderr, "Bad address: %s\n", ip);
748
errno = e;
605
749
goto mandos_end;
606
750
}
607
751
if(af == AF_INET6){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
752
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
753
if(IN6_IS_ADDR_LINKLOCAL
754
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
615
755
if(if_index == AVAHI_IF_UNSPEC){
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
756
fprintf_plus(stderr, "An IPv6 link-local address is"
757
" incomplete without a network interface\n");
758
errno = EINVAL;
618
759
goto mandos_end;
619
760
}
620
761
/* Set the network interface number as scope */
621
to.in6.sin6_scope_id = (uint32_t)if_index;
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
622
763
}
623
764
} else {
624
to.in.sin_port = htons(port); /* Spurious warnings from
625
-Wconversion and
626
-Wunreachable-code */
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
627
766
}
628
767
629
768
if(quit_now){
769
errno = EINTR;
630
770
goto mandos_end;
631
771
}
632
772
634
774
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
635
775
char interface[IF_NAMESIZE];
636
776
if(if_indextoname((unsigned int)if_index, interface) == NULL){
637
perror("if_indextoname");
777
perror_plus("if_indextoname");
638
778
} else {
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
779
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
780
"\n", ip, interface, (uintmax_t)port);
641
781
}
642
782
} else {
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
783
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
784
ip, (uintmax_t)port);
645
785
}
646
786
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
647
787
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
648
const char *pcret;
649
788
if(af == AF_INET6){
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
652
793
} else {
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
655
798
}
656
if(pcret == NULL){
657
perror("inet_ntop");
658
} else {
659
if(strcmp(addrstr, ip) != 0){
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
661
}
799
if(ret == EAI_SYSTEM){
800
perror_plus("getnameinfo");
801
} else if(ret != 0) {
802
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
803
} else if(strcmp(addrstr, ip) != 0){
804
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
662
805
}
663
806
}
664
807
665
808
if(quit_now){
809
errno = EINTR;
666
810
goto mandos_end;
667
811
}
668
812
669
813
if(af == AF_INET6){
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
671
816
} else {
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
673
819
}
674
820
if(ret < 0){
675
perror("connect");
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
822
int e = errno;
823
perror_plus("connect");
824
errno = e;
825
}
676
826
goto mandos_end;
677
827
}
678
828
679
829
if(quit_now){
830
errno = EINTR;
680
831
goto mandos_end;
681
832
}
682
833
685
836
while(true){
686
837
size_t out_size = strlen(out);
687
838
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
688
out_size - written));
839
out_size - written));
689
840
if(ret == -1){
690
perror("write");
841
int e = errno;
842
perror_plus("write");
843
errno = e;
691
844
goto mandos_end;
692
845
}
693
846
written += (size_t)ret;
703
856
}
704
857
705
858
if(quit_now){
859
errno = EINTR;
706
860
goto mandos_end;
707
861
}
708
862
}
709
863
710
864
if(debug){
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
865
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
712
866
}
713
867
714
868
if(quit_now){
869
errno = EINTR;
715
870
goto mandos_end;
716
871
}
717
872
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
873
/* This casting via intptr_t is to eliminate warning about casting
874
an int to a pointer type. This is exactly how the GnuTLS Guile
875
function "set-session-transport-fd!" does it. */
876
gnutls_transport_set_ptr(session,
877
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
719
878
720
879
if(quit_now){
880
errno = EINTR;
721
881
goto mandos_end;
722
882
}
723
883
724
884
do {
725
885
ret = gnutls_handshake(session);
726
886
if(quit_now){
887
errno = EINTR;
727
888
goto mandos_end;
728
889
}
729
890
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
891
731
892
if(ret != GNUTLS_E_SUCCESS){
732
893
if(debug){
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
894
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
734
895
gnutls_perror(ret);
735
896
}
897
errno = EPROTO;
736
898
goto mandos_end;
737
899
}
738
900
739
901
/* Read OpenPGP packet that contains the wanted password */
740
902
741
903
if(debug){
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
904
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
905
" %s\n", ip);
744
906
}
745
907
746
908
while(true){
747
909
748
910
if(quit_now){
911
errno = EINTR;
749
912
goto mandos_end;
750
913
}
751
914
752
915
buffer_capacity = incbuffer(&buffer, buffer_length,
753
buffer_capacity);
916
buffer_capacity);
754
917
if(buffer_capacity == 0){
755
perror("incbuffer");
918
int e = errno;
919
perror_plus("incbuffer");
920
errno = e;
756
921
goto mandos_end;
757
922
}
758
923
759
924
if(quit_now){
925
errno = EINTR;
760
926
goto mandos_end;
761
927
}
762
928
775
941
ret = gnutls_handshake(session);
776
942
777
943
if(quit_now){
944
errno = EINTR;
778
945
goto mandos_end;
779
946
}
780
947
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
781
948
if(ret < 0){
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
949
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
950
"***\n");
783
951
gnutls_perror(ret);
952
errno = EPROTO;
784
953
goto mandos_end;
785
954
}
786
955
break;
787
956
default:
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
957
fprintf_plus(stderr, "Unknown error while reading data from"
958
" encrypted session with Mandos server\n");
790
959
gnutls_bye(session, GNUTLS_SHUT_RDWR);
960
errno = EIO;
791
961
goto mandos_end;
792
962
}
793
963
} else {
796
966
}
797
967
798
968
if(debug){
799
fprintf(stderr, "Closing TLS session\n");
969
fprintf_plus(stderr, "Closing TLS session\n");
800
970
}
801
971
802
972
if(quit_now){
973
errno = EINTR;
803
974
goto mandos_end;
804
975
}
805
976
806
977
do {
807
978
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
979
if(quit_now){
980
errno = EINTR;
809
981
goto mandos_end;
810
982
}
811
983
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
984
813
985
if(buffer_length > 0){
814
986
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
817
&decrypted_buffer);
987
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
988
&decrypted_buffer, mc);
818
989
if(decrypted_buffer_size >= 0){
819
990
820
991
written = 0;
821
992
while(written < (size_t) decrypted_buffer_size){
822
993
if(quit_now){
994
errno = EINTR;
823
995
goto mandos_end;
824
996
}
825
997
827
999
(size_t)decrypted_buffer_size - written,
828
1000
stdout);
829
1001
if(ret == 0 and ferror(stdout)){
1002
int e = errno;
830
1003
if(debug){
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
1004
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1005
strerror(errno));
833
1006
}
1007
errno = e;
834
1008
goto mandos_end;
835
1009
}
836
1010
written += (size_t)ret;
842
1016
/* Shutdown procedure */
843
1017
844
1018
mandos_end:
845
free(decrypted_buffer);
846
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
850
if(ret == -1){
851
perror("close");
852
}
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
1019
{
1020
int e = errno;
1021
free(decrypted_buffer);
1022
free(buffer);
1023
if(tcp_sd >= 0){
1024
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1025
}
1026
if(ret == -1){
1027
if(e == 0){
1028
e = errno;
1029
}
1030
perror_plus("close");
1031
}
1032
gnutls_deinit(session);
1033
errno = e;
1034
if(quit_now){
1035
errno = EINTR;
1036
retval = -1;
1037
}
856
1038
}
857
1039
return retval;
858
1040
}
859
1041
1042
__attribute__((nonnull))
860
1043
static void resolve_callback(AvahiSServiceResolver *r,
861
1044
AvahiIfIndex interface,
862
1045
AvahiProtocol proto,
870
1053
AVAHI_GCC_UNUSED AvahiStringList *txt,
871
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
872
1055
flags,
873
AVAHI_GCC_UNUSED void* userdata){
874
assert(r);
1056
void *mc){
1057
if(r == NULL){
1058
return;
1059
}
875
1060
876
1061
/* Called whenever a service has been resolved successfully or
877
1062
timed out */
883
1068
switch(event){
884
1069
default:
885
1070
case AVAHI_RESOLVER_FAILURE:
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1071
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1072
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1073
domain,
1074
avahi_strerror(avahi_server_errno
1075
(((mandos_context*)mc)->server)));
889
1076
break;
890
1077
891
1078
case AVAHI_RESOLVER_FOUND:
893
1080
char ip[AVAHI_ADDRESS_STR_MAX];
894
1081
avahi_address_snprint(ip, sizeof(ip), address);
895
1082
if(debug){
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1083
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1084
PRIdMAX ") on port %" PRIu16 "\n", name,
1085
host_name, ip, (intmax_t)interface, port);
899
1086
}
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
1087
int ret = start_mandos_communication(ip, (in_port_t)port,
1088
interface,
1089
avahi_proto_to_af(proto),
1090
mc);
902
1091
if(ret == 0){
903
avahi_simple_poll_quit(mc.simple_poll);
1092
avahi_simple_poll_quit(simple_poll);
1093
} else {
1094
if(not add_server(ip, (in_port_t)port, interface,
1095
avahi_proto_to_af(proto),
1096
&((mandos_context*)mc)->current_server)){
1097
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1098
" list\n", name);
1099
}
904
1100
}
905
1101
}
906
1102
}
916
1112
const char *domain,
917
1113
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1114
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(b);
1115
void *mc){
1116
if(b == NULL){
1117
return;
1118
}
921
1119
922
1120
/* Called whenever a new services becomes available on the LAN or
923
1121
is removed from the LAN */
930
1128
default:
931
1129
case AVAHI_BROWSER_FAILURE:
932
1130
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
1131
fprintf_plus(stderr, "(Avahi browser) %s\n",
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1134
avahi_simple_poll_quit(simple_poll);
936
1135
return;
937
1136
938
1137
case AVAHI_BROWSER_NEW:
941
1140
the callback function is called the Avahi server will free the
942
1141
resolver for us. */
943
1142
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1143
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1144
interface, protocol, name, type,
1145
domain, protocol, 0,
1146
resolve_callback, mc) == NULL)
1147
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1148
" %s\n", name,
1149
avahi_strerror(avahi_server_errno
1150
(((mandos_context*)mc)->server)));
949
1151
break;
950
1152
951
1153
case AVAHI_BROWSER_REMOVE:
954
1156
case AVAHI_BROWSER_ALL_FOR_NOW:
955
1157
case AVAHI_BROWSER_CACHE_EXHAUSTED:
956
1158
if(debug){
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1159
fprintf_plus(stderr, "No Mandos server found, still"
1160
" searching...\n");
958
1161
}
959
1162
break;
960
1163
}
961
1164
}
962
1165
963
/* stop main loop after sigterm has been called */
1166
/* Signal handler that stops main loop after SIGTERM */
964
1167
static void handle_sigterm(int sig){
965
1168
if(quit_now){
966
1169
return;
968
1171
quit_now = 1;
969
1172
signal_received = sig;
970
1173
int old_errno = errno;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
1174
/* set main loop to exit */
1175
if(simple_poll != NULL){
1176
avahi_simple_poll_quit(simple_poll);
1177
}
1178
errno = old_errno;
1179
}
1180
1181
__attribute__((nonnull, warn_unused_result))
1182
bool get_flags(const char *ifname, struct ifreq *ifr){
1183
int ret;
1184
error_t ret_errno;
1185
1186
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1187
if(s < 0){
1188
ret_errno = errno;
1189
perror_plus("socket");
1190
errno = ret_errno;
1191
return false;
1192
}
1193
strcpy(ifr->ifr_name, ifname);
1194
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1195
if(ret == -1){
1196
if(debug){
1197
ret_errno = errno;
1198
perror_plus("ioctl SIOCGIFFLAGS");
1199
errno = ret_errno;
1200
}
1201
return false;
1202
}
1203
return true;
1204
}
1205
1206
__attribute__((nonnull, warn_unused_result))
1207
bool good_flags(const char *ifname, const struct ifreq *ifr){
1208
1209
/* Reject the loopback device */
1210
if(ifr->ifr_flags & IFF_LOOPBACK){
1211
if(debug){
1212
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1213
ifname);
1214
}
1215
return false;
1216
}
1217
/* Accept point-to-point devices only if connect_to is specified */
1218
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1219
if(debug){
1220
fprintf_plus(stderr, "Accepting point-to-point interface"
1221
" \"%s\"\n", ifname);
1222
}
1223
return true;
1224
}
1225
/* Otherwise, reject non-broadcast-capable devices */
1226
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1229
" \"%s\"\n", ifname);
1230
}
1231
return false;
1232
}
1233
/* Reject non-ARP interfaces (including dummy interfaces) */
1234
if(ifr->ifr_flags & IFF_NOARP){
1235
if(debug){
1236
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1237
ifname);
1238
}
1239
return false;
1240
}
1241
1242
/* Accept this device */
1243
if(debug){
1244
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1245
}
1246
return true;
1247
}
1248
1249
/*
1250
* This function determines if a directory entry in /sys/class/net
1251
* corresponds to an acceptable network device.
1252
* (This function is passed to scandir(3) as a filter function.)
1253
*/
1254
__attribute__((nonnull, warn_unused_result))
1255
int good_interface(const struct dirent *if_entry){
1256
if(if_entry->d_name[0] == '.'){
1257
return 0;
1258
}
1259
1260
struct ifreq ifr;
1261
if(not get_flags(if_entry->d_name, &ifr)){
1262
if(debug){
1263
fprintf_plus(stderr, "Failed to get flags for interface "
1264
"\"%s\"\n", if_entry->d_name);
1265
}
1266
return 0;
1267
}
1268
1269
if(not good_flags(if_entry->d_name, &ifr)){
1270
return 0;
1271
}
1272
return 1;
1273
}
1274
1275
/*
1276
* This function determines if a network interface is up.
1277
*/
1278
__attribute__((nonnull, warn_unused_result))
1279
bool interface_is_up(const char *interface){
1280
struct ifreq ifr;
1281
if(not get_flags(interface, &ifr)){
1282
if(debug){
1283
fprintf_plus(stderr, "Failed to get flags for interface "
1284
"\"%s\"\n", interface);
1285
}
1286
return false;
1287
}
1288
1289
return (bool)(ifr.ifr_flags & IFF_UP);
1290
}
1291
1292
/*
1293
* This function determines if a network interface is running
1294
*/
1295
__attribute__((nonnull, warn_unused_result))
1296
bool interface_is_running(const char *interface){
1297
struct ifreq ifr;
1298
if(not get_flags(interface, &ifr)){
1299
if(debug){
1300
fprintf_plus(stderr, "Failed to get flags for interface "
1301
"\"%s\"\n", interface);
1302
}
1303
return false;
1304
}
1305
1306
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1307
}
1308
1309
__attribute__((nonnull, pure, warn_unused_result))
1310
int notdotentries(const struct dirent *direntry){
1311
/* Skip "." and ".." */
1312
if(direntry->d_name[0] == '.'
1313
and (direntry->d_name[1] == '\0'
1314
or (direntry->d_name[1] == '.'
1315
and direntry->d_name[2] == '\0'))){
1316
return 0;
1317
}
1318
return 1;
1319
}
1320
1321
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1323
int runnable_hook(const struct dirent *direntry){
1324
int ret;
1325
size_t sret;
1326
struct stat st;
1327
1328
if((direntry->d_name)[0] == '\0'){
1329
/* Empty name? */
1330
return 0;
1331
}
1332
1333
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1334
"abcdefghijklmnopqrstuvwxyz"
1335
"0123456789"
1336
"_-");
1337
if((direntry->d_name)[sret] != '\0'){
1338
/* Contains non-allowed characters */
1339
if(debug){
1340
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
1346
char *fullname = NULL;
1347
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1348
if(ret < 0){
1349
perror_plus("asprintf");
1350
return 0;
1351
}
1352
1353
ret = stat(fullname, &st);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1380
return 1;
1381
}
1382
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1386
int ret;
1387
struct timespec now;
1388
struct timespec waited_time;
1389
intmax_t block_time;
1390
1391
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1396
}
1397
ret = avahi_simple_poll_iterate(s, -1);
1398
} else {
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1402
}
1403
/* the current time */
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1405
if(ret == -1){
1406
perror_plus("clock_gettime");
1407
return -1;
1408
}
1409
/* Calculating in ms how long time between now and server
1410
who we visted longest time ago. Now - last seen. */
1411
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1413
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1415
/* total time is 10s/10,000ms.
1416
Converting to s from ms by dividing by 1,000,
1417
and ns to ms by dividing by 1,000,000. */
1418
block_time = ((retry_interval
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1425
}
1426
1427
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1432
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1434
return 0;
1435
}
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1438
if(ret == -1){
1439
perror_plus("clock_gettime");
1440
return -1;
1441
}
1442
mc->current_server = mc->current_server->next;
1443
block_time = 0; /* Call avahi to find new Mandos
1444
servers, but don't block */
1445
}
1446
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
}
1449
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1451
return (ret != 1) ? ret : 0;
1452
}
1453
}
1454
}
1455
}
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
perror_plus("seteuid");
1465
}
1466
errno = old_errno;
1467
return ret_errno;
1468
}
1469
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1472
error_t raise_privileges_permanently(void){
1473
error_t old_errno = errno;
1474
error_t ret_errno = raise_privileges();
1475
if(ret_errno != 0){
1476
errno = old_errno;
1477
return ret_errno;
1478
}
1479
if(setuid(0) == -1){
1480
ret_errno = errno;
1481
perror_plus("seteuid");
1482
}
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1489
error_t lower_privileges(void){
1490
error_t old_errno = errno;
1491
error_t ret_errno = 0;
1492
if(seteuid(uid) == -1){
1493
ret_errno = errno;
1494
perror_plus("seteuid");
1495
}
1496
errno = old_errno;
1497
return ret_errno;
1498
}
1499
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1502
error_t lower_privileges_permanently(void){
1503
error_t old_errno = errno;
1504
error_t ret_errno = 0;
1505
if(setuid(uid) == -1){
1506
ret_errno = errno;
1507
perror_plus("setuid");
1508
}
1509
errno = old_errno;
1510
return ret_errno;
1511
}
1512
1513
__attribute__((nonnull))
1514
void run_network_hooks(const char *mode, const char *interface,
1515
const float delay){
1516
struct dirent **direntries;
1517
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1518
alphasort);
1519
if(numhooks == -1){
1520
if(errno == ENOENT){
1521
if(debug){
1522
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1523
" found\n", hookdir);
1524
}
1525
} else {
1526
perror_plus("scandir");
1527
}
1528
} else {
1529
struct dirent *direntry;
1530
int ret;
1531
int devnull = open("/dev/null", O_RDONLY);
1532
for(int i = 0; i < numhooks; i++){
1533
direntry = direntries[i];
1534
char *fullname = NULL;
1535
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1536
if(ret < 0){
1537
perror_plus("asprintf");
1538
continue;
1539
}
1540
if(debug){
1541
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1542
direntry->d_name);
1543
}
1544
pid_t hook_pid = fork();
1545
if(hook_pid == 0){
1546
/* Child */
1547
/* Raise privileges */
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1551
}
1552
/* Set group */
1553
errno = 0;
1554
ret = setgid(0);
1555
if(ret == -1){
1556
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1558
}
1559
/* Reset supplementary groups */
1560
errno = 0;
1561
ret = setgroups(0, NULL);
1562
if(ret == -1){
1563
perror_plus("setgroups");
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1581
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
ret = setenv("DEVICE", interface, 1);
1587
if(ret == -1){
1588
perror_plus("setenv");
1589
_exit(EX_OSERR);
1590
}
1591
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1592
if(ret == -1){
1593
perror_plus("setenv");
1594
_exit(EX_OSERR);
1595
}
1596
ret = setenv("MODE", mode, 1);
1597
if(ret == -1){
1598
perror_plus("setenv");
1599
_exit(EX_OSERR);
1600
}
1601
char *delaystring;
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1603
if(ret == -1){
1604
perror_plus("asprintf");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("DELAY", delaystring, 1);
1608
if(ret == -1){
1609
free(delaystring);
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
free(delaystring);
1614
if(connect_to != NULL){
1615
ret = setenv("CONNECT", connect_to, 1);
1616
if(ret == -1){
1617
perror_plus("setenv");
1618
_exit(EX_OSERR);
1619
}
1620
}
1621
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1622
perror_plus("execl");
1623
_exit(EXIT_FAILURE);
1624
}
1625
} else {
1626
int status;
1627
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1628
perror_plus("waitpid");
1629
free(fullname);
1630
continue;
1631
}
1632
if(WIFEXITED(status)){
1633
if(WEXITSTATUS(status) != 0){
1634
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1635
" with status %d\n", direntry->d_name,
1636
WEXITSTATUS(status));
1637
free(fullname);
1638
continue;
1639
}
1640
} else if(WIFSIGNALED(status)){
1641
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1642
" signal %d\n", direntry->d_name,
1643
WTERMSIG(status));
1644
free(fullname);
1645
continue;
1646
} else {
1647
fprintf_plus(stderr, "Warning: network hook \"%s\""
1648
" crashed\n", direntry->d_name);
1649
free(fullname);
1650
continue;
1651
}
1652
}
1653
free(fullname);
1654
if(debug){
1655
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1656
direntry->d_name);
1657
}
1658
}
1659
close(devnull);
1660
}
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
error_t bring_up_interface(const char *const interface,
1665
const float delay){
1666
error_t old_errno = errno;
1667
int ret;
1668
struct ifreq network;
1669
unsigned int if_index = if_nametoindex(interface);
1670
if(if_index == 0){
1671
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1672
errno = old_errno;
1673
return ENXIO;
1674
}
1675
1676
if(quit_now){
1677
errno = old_errno;
1678
return EINTR;
1679
}
1680
1681
if(not interface_is_up(interface)){
1682
error_t ret_errno = 0, ioctl_errno = 0;
1683
if(not get_flags(interface, &network)){
1684
ret_errno = errno;
1685
fprintf_plus(stderr, "Failed to get flags for interface "
1686
"\"%s\"\n", interface);
1687
errno = old_errno;
1688
return ret_errno;
1689
}
1690
network.ifr_flags |= IFF_UP; /* set flag */
1691
1692
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1693
if(sd == -1){
1694
ret_errno = errno;
1695
perror_plus("socket");
1696
errno = old_errno;
1697
return ret_errno;
1698
}
1699
1700
if(quit_now){
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
errno = old_errno;
1706
return EINTR;
1707
}
1708
1709
if(debug){
1710
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1711
interface);
1712
}
1713
1714
/* Raise privileges */
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
1717
if(ret_errno != 0){
1718
perror_plus("Failed to raise privileges");
1719
}
1720
#ifdef __linux__
1721
int ret_linux;
1722
if(ret_errno == 0){
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1724
messages about the network interface to mess up the prompt */
1725
ret_linux = klogctl(8, NULL, 5);
1726
if(ret_linux == -1){
1727
perror_plus("klogctl");
1728
} else {
1729
restore_loglevel = true;
1730
}
1731
}
1732
#endif /* __linux__ */
1733
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1734
ioctl_errno = errno;
1735
#ifdef __linux__
1736
if(restore_loglevel){
1737
ret_linux = klogctl(7, NULL, 0);
1738
if(ret_linux == -1){
1739
perror_plus("klogctl");
1740
}
1741
}
1742
#endif /* __linux__ */
1743
1744
/* If raise_privileges() succeeded above */
1745
if(ret_errno == 0){
1746
/* Lower privileges */
1747
ret_errno = lower_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to lower privileges");
1751
}
1752
}
1753
1754
/* Close the socket */
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1756
if(ret == -1){
1757
perror_plus("close");
1758
}
1759
1760
if(ret_setflags == -1){
1761
errno = ioctl_errno;
1762
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1763
errno = old_errno;
1764
return ioctl_errno;
1765
}
1766
} else if(debug){
1767
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1768
interface);
1769
}
1770
1771
/* Sleep checking until interface is running.
1772
Check every 0.25s, up to total time of delay */
1773
for(int i=0; i < delay * 4; i++){
1774
if(interface_is_running(interface)){
1775
break;
1776
}
1777
struct timespec sleeptime = { .tv_nsec = 250000000 };
1778
ret = nanosleep(&sleeptime, NULL);
1779
if(ret == -1 and errno != EINTR){
1780
perror_plus("nanosleep");
1781
}
1782
}
1783
1784
errno = old_errno;
1785
return 0;
1786
}
1787
1788
__attribute__((nonnull, warn_unused_result))
1789
error_t take_down_interface(const char *const interface){
1790
error_t old_errno = errno;
1791
struct ifreq network;
1792
unsigned int if_index = if_nametoindex(interface);
1793
if(if_index == 0){
1794
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1795
errno = old_errno;
1796
return ENXIO;
1797
}
1798
if(interface_is_up(interface)){
1799
error_t ret_errno = 0, ioctl_errno = 0;
1800
if(not get_flags(interface, &network) and debug){
1801
ret_errno = errno;
1802
fprintf_plus(stderr, "Failed to get flags for interface "
1803
"\"%s\"\n", interface);
1804
errno = old_errno;
1805
return ret_errno;
1806
}
1807
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1808
1809
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(sd == -1){
1811
ret_errno = errno;
1812
perror_plus("socket");
1813
errno = old_errno;
1814
return ret_errno;
1815
}
1816
1817
if(debug){
1818
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1819
interface);
1820
}
1821
1822
/* Raise privileges */
1823
ret_errno = raise_privileges();
1824
if(ret_errno != 0){
1825
perror_plus("Failed to raise privileges");
1826
}
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1828
ioctl_errno = errno;
1829
1830
/* If raise_privileges() succeeded above */
1831
if(ret_errno == 0){
1832
/* Lower privileges */
1833
ret_errno = lower_privileges();
1834
if(ret_errno != 0){
1835
errno = ret_errno;
1836
perror_plus("Failed to lower privileges");
1837
}
1838
}
1839
1840
/* Close the socket */
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1842
if(ret == -1){
1843
perror_plus("close");
1844
}
1845
1846
if(ret_setflags == -1){
1847
errno = ioctl_errno;
1848
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1849
errno = old_errno;
1850
return ioctl_errno;
1851
}
1852
} else if(debug){
1853
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1854
interface);
1855
}
1856
1857
errno = old_errno;
1858
return 0;
975
1859
}
976
1860
977
1861
int main(int argc, char *argv[]){
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1863
.priority = "SECURE256:!CTYPE-X.509:"
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1865
.interfaces = NULL, .interfaces_size = 0 };
978
1866
AvahiSServiceBrowser *sb = NULL;
979
int error;
1867
error_t ret_errno;
980
1868
int ret;
981
1869
intmax_t tmpmax;
982
1870
char *tmp;
983
1871
int exitcode = EXIT_SUCCESS;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
1872
char *interfaces_to_take_down = NULL;
1873
size_t interfaces_to_take_down_size = 0;
991
1874
char tempdir[] = "/tmp/mandosXXXXXX";
992
1875
bool tempdir_created = false;
993
1876
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
1877
const char *seckey = PATHDIR "/" SECKEY;
995
1878
const char *pubkey = PATHDIR "/" PUBKEY;
1879
char *interfaces_hooks = NULL;
996
1880
997
1881
bool gnutls_initialized = false;
998
1882
bool gpgme_initialized = false;
999
1883
float delay = 2.5f;
1884
double retry_interval = 10; /* 10s between trying a server and
1885
retrying the same server again */
1000
1886
1001
1887
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
1888
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1008
1894
errno = 0;
1009
1895
ret = setgid(gid);
1010
1896
if(ret == -1){
1011
perror("setgid");
1897
perror_plus("setgid");
1012
1898
}
1013
1899
1014
1900
/* Lower user privileges (temporarily) */
1015
1901
errno = 0;
1016
1902
ret = seteuid(uid);
1017
1903
if(ret == -1){
1018
perror("seteuid");
1904
perror_plus("seteuid");
1019
1905
}
1020
1906
1021
1907
if(quit_now){
1056
1942
.arg = "SECONDS",
1057
1943
.doc = "Maximum delay to wait for interface startup",
1058
1944
.group = 2 },
1945
{ .name = "retry", .key = 132,
1946
.arg = "SECONDS",
1947
.doc = "Retry interval used when denied by the Mandos server",
1948
.group = 2 },
1949
{ .name = "network-hook-dir", .key = 133,
1950
.arg = "DIR",
1951
.doc = "Directory where network hooks are located",
1952
.group = 2 },
1953
/*
1954
* These reproduce what we would get without ARGP_NO_HELP
1955
*/
1956
{ .name = "help", .key = '?',
1957
.doc = "Give this help list", .group = -1 },
1958
{ .name = "usage", .key = -3,
1959
.doc = "Give a short usage message", .group = -1 },
1960
{ .name = "version", .key = 'V',
1961
.doc = "Print program version", .group = -1 },
1059
1962
{ .name = NULL }
1060
1963
};
1061
1964
1062
1965
error_t parse_opt(int key, char *arg,
1063
1966
struct argp_state *state){
1967
errno = 0;
1064
1968
switch(key){
1065
1969
case 128: /* --debug */
1066
1970
debug = true;
1069
1973
connect_to = arg;
1070
1974
break;
1071
1975
case 'i': /* --interface */
1072
interface = arg;
1976
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1977
arg, (int)',');
1978
if(ret_errno != 0){
1979
argp_error(state, "%s", strerror(ret_errno));
1980
}
1073
1981
break;
1074
1982
case 's': /* --seckey */
1075
1983
seckey = arg;
1082
1990
tmpmax = strtoimax(arg, &tmp, 10);
1083
1991
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
1992
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
1993
argp_error(state, "Bad number of DH bits");
1087
1994
}
1088
1995
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1089
1996
break;
1094
2001
errno = 0;
1095
2002
delay = strtof(arg, &tmp);
1096
2003
if(errno != 0 or tmp == arg or *tmp != '\0'){
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
2004
argp_error(state, "Bad delay");
2005
}
2006
case 132: /* --retry */
2007
errno = 0;
2008
retry_interval = strtod(arg, &tmp);
2009
if(errno != 0 or tmp == arg or *tmp != '\0'
2010
or (retry_interval * 1000) > INT_MAX
2011
or retry_interval < 0){
2012
argp_error(state, "Bad retry interval");
2013
}
2014
break;
2015
case 133: /* --network-hook-dir */
2016
hookdir = arg;
2017
break;
2018
/*
2019
* These reproduce what we would get without ARGP_NO_HELP
2020
*/
2021
case '?': /* --help */
2022
argp_state_help(state, state->out_stream,
2023
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2024
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2025
case -3: /* --usage */
2026
argp_state_help(state, state->out_stream,
2027
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2028
case 'V': /* --version */
2029
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2030
exit(argp_err_exit_status);
1104
2031
break;
1105
2032
default:
1106
2033
return ARGP_ERR_UNKNOWN;
1107
2034
}
1108
return 0;
2035
return errno;
1109
2036
}
1110
2037
1111
2038
struct argp argp = { .options = options, .parser = parse_opt,
1112
2039
.args_doc = "",
1113
2040
.doc = "Mandos client -- Get and decrypt"
1114
2041
" passwords from a Mandos server" };
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
2042
ret = argp_parse(&argp, argc, argv,
2043
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2044
switch(ret){
2045
case 0:
2046
break;
2047
case ENOMEM:
2048
default:
2049
errno = ret;
2050
perror_plus("argp_parse");
2051
exitcode = EX_OSERR;
2052
goto end;
2053
case EINVAL:
2054
exitcode = EX_USAGE;
2055
goto end;
2056
}
2057
}
2058
2059
{
2060
/* Work around Debian bug #633582:
2061
<http://bugs.debian.org/633582> */
2062
2063
/* Re-raise privileges */
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2067
perror_plus("Failed to raise privileges");
2068
} else {
2069
struct stat st;
2070
2071
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2072
int seckey_fd = open(seckey, O_RDONLY);
2073
if(seckey_fd == -1){
2074
perror_plus("open");
2075
} else {
2076
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2077
if(ret == -1){
2078
perror_plus("fstat");
2079
} else {
2080
if(S_ISREG(st.st_mode)
2081
and st.st_uid == 0 and st.st_gid == 0){
2082
ret = fchown(seckey_fd, uid, gid);
2083
if(ret == -1){
2084
perror_plus("fchown");
2085
}
2086
}
2087
}
2088
TEMP_FAILURE_RETRY(close(seckey_fd));
2089
}
2090
}
2091
2092
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2093
int pubkey_fd = open(pubkey, O_RDONLY);
2094
if(pubkey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(pubkey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(pubkey_fd));
2110
}
2111
}
2112
2113
/* Lower privileges */
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2117
perror_plus("Failed to lower privileges");
2118
}
2119
}
2120
}
2121
2122
/* Remove invalid interface names (except "none") */
2123
{
2124
char *interface = NULL;
2125
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2126
interface))){
2127
if(strcmp(interface, "none") != 0
2128
and if_nametoindex(interface) == 0){
2129
if(interface[0] != '\0'){
2130
fprintf_plus(stderr, "Not using nonexisting interface"
2131
" \"%s\"\n", interface);
2132
}
2133
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2134
interface = NULL;
2135
}
2136
}
2137
}
2138
2139
/* Run network hooks */
2140
{
2141
if(mc.interfaces != NULL){
2142
interfaces_hooks = malloc(mc.interfaces_size);
2143
if(interfaces_hooks == NULL){
2144
perror_plus("malloc");
2145
goto end;
2146
}
2147
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2148
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2149
}
2150
run_network_hooks("start", interfaces_hooks != NULL ?
2151
interfaces_hooks : "", delay);
1121
2152
}
1122
2153
1123
2154
if(not debug){
1128
2159
from the signal handler */
1129
2160
/* Initialize the pseudo-RNG for Avahi */
1130
2161
srand((unsigned int) time(NULL));
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2162
simple_poll = avahi_simple_poll_new();
2163
if(simple_poll == NULL){
2164
fprintf_plus(stderr,
2165
"Avahi: Failed to create simple poll object.\n");
2166
exitcode = EX_UNAVAILABLE;
1135
2167
goto end;
1136
2168
}
1137
2169
1138
2170
sigemptyset(&sigterm_action.sa_mask);
1139
2171
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
2172
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2173
perror_plus("sigaddset");
2174
exitcode = EX_OSERR;
1143
2175
goto end;
1144
2176
}
1145
2177
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
2178
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2179
perror_plus("sigaddset");
2180
exitcode = EX_OSERR;
1149
2181
goto end;
1150
2182
}
1151
2183
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
2184
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2185
perror_plus("sigaddset");
2186
exitcode = EX_OSERR;
1155
2187
goto end;
1156
2188
}
1157
2189
/* Need to check if the handler is SIG_IGN before handling:
1160
2192
*/
1161
2193
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
2194
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2195
perror_plus("sigaction");
2196
return EX_OSERR;
1165
2197
}
1166
2198
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
2199
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
2200
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2201
perror_plus("sigaction");
2202
exitcode = EX_OSERR;
1171
2203
goto end;
1172
2204
}
1173
2205
}
1174
2206
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
2207
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2208
perror_plus("sigaction");
2209
return EX_OSERR;
1178
2210
}
1179
2211
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
2212
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
2213
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2214
perror_plus("sigaction");
2215
exitcode = EX_OSERR;
1184
2216
goto end;
1185
2217
}
1186
2218
}
1187
2219
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
2220
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2221
perror_plus("sigaction");
2222
return EX_OSERR;
1191
2223
}
1192
2224
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
2225
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
2226
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
}
1200
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
2227
perror_plus("sigaction");
2228
exitcode = EX_OSERR;
2229
goto end;
2230
}
2231
}
2232
2233
/* If no interfaces were specified, make a list */
2234
if(mc.interfaces == NULL){
2235
struct dirent **direntries;
2236
/* Look for any good interfaces */
2237
ret = scandir(sys_class_net, &direntries, good_interface,
2238
alphasort);
2239
if(ret >= 1){
2240
/* Add all found interfaces to interfaces list */
2241
for(int i = 0; i < ret; ++i){
2242
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2243
direntries[i]->d_name);
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("argz_add");
2247
continue;
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2251
direntries[i]->d_name);
2252
}
2253
}
2254
free(direntries);
2255
} else {
2256
free(direntries);
2257
fprintf_plus(stderr, "Could not find a network interface\n");
2258
exitcode = EXIT_FAILURE;
2259
goto end;
2260
}
2261
}
2262
2263
/* Bring up interfaces which are down, and remove any "none"s */
2264
{
2265
char *interface = NULL;
2266
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2267
interface))){
2268
/* If interface name is "none", stop bringing up interfaces.
2269
Also remove all instances of "none" from the list */
2270
if(strcmp(interface, "none") == 0){
2271
argz_delete(&mc.interfaces, &mc.interfaces_size,
2272
interface);
2273
interface = NULL;
2274
while((interface = argz_next(mc.interfaces,
2275
mc.interfaces_size, interface))){
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
1286
2280
}
1287
2281
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
2282
break;
1305
2283
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
1336
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
2284
bool interface_was_up = interface_is_up(interface);
2285
errno = bring_up_interface(interface, delay);
2286
if(not interface_was_up){
2287
if(errno != 0){
2288
perror_plus("Failed to bring up interface");
2289
} else {
2290
errno = argz_add(&interfaces_to_take_down,
2291
&interfaces_to_take_down_size,
2292
interface);
2293
if(errno != 0){
2294
perror_plus("argz_add");
2295
}
2296
}
2297
}
2298
}
2299
if(debug and (interfaces_to_take_down == NULL)){
2300
fprintf_plus(stderr, "No interfaces were brought up\n");
2301
}
2302
}
2303
2304
/* If we only got one interface, explicitly use only that one */
2305
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2306
if(debug){
2307
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2308
mc.interfaces);
2309
}
2310
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1343
2311
}
1344
2312
1345
2313
if(quit_now){
1346
2314
goto end;
1347
2315
}
1348
2316
1349
ret = init_gnutls_global(pubkey, seckey);
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
1350
2318
if(ret == -1){
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2319
fprintf_plus(stderr, "init_gnutls_global failed\n");
2320
exitcode = EX_UNAVAILABLE;
1353
2321
goto end;
1354
2322
} else {
1355
2323
gnutls_initialized = true;
1359
2327
goto end;
1360
2328
}
1361
2329
2330
if(mkdtemp(tempdir) == NULL){
2331
perror_plus("mkdtemp");
2332
goto end;
2333
}
1362
2334
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
1366
goto end;
1367
}
1368
2335
1369
2336
if(quit_now){
1370
2337
goto end;
1371
2338
}
1372
2339
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2340
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2341
fprintf_plus(stderr, "init_gpgme failed\n");
2342
exitcode = EX_UNAVAILABLE;
1376
2343
goto end;
1377
2344
} else {
1378
2345
gpgme_initialized = true;
1386
2353
/* Connect directly, do not use Zeroconf */
1387
2354
/* (Mainly meant for debugging) */
1388
2355
char *address = strrchr(connect_to, ':');
2356
1389
2357
if(address == NULL){
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2358
fprintf_plus(stderr, "No colon in address\n");
2359
exitcode = EX_USAGE;
1392
2360
goto end;
1393
2361
}
1394
2362
1396
2364
goto end;
1397
2365
}
1398
2366
1399
uint16_t port;
2367
in_port_t port;
1400
2368
errno = 0;
1401
2369
tmpmax = strtoimax(address+1, &tmp, 10);
1402
2370
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2371
or tmpmax != (in_port_t)tmpmax){
2372
fprintf_plus(stderr, "Bad port number\n");
2373
exitcode = EX_USAGE;
1406
2374
goto end;
1407
2375
}
1408
2376
1409
2377
if(quit_now){
1410
2378
goto end;
1411
2379
}
1412
2380
1413
port = (uint16_t)tmpmax;
2381
port = (in_port_t)tmpmax;
1414
2382
*address = '\0';
1415
address = connect_to;
1416
2383
/* Colon in address indicates IPv6 */
1417
2384
int af;
1418
if(strchr(address, ':') != NULL){
2385
if(strchr(connect_to, ':') != NULL){
1419
2386
af = AF_INET6;
2387
/* Accept [] around IPv6 address - see RFC 5952 */
2388
if(connect_to[0] == '[' and address[-1] == ']')
2389
{
2390
connect_to++;
2391
address[-1] = '\0';
2392
}
1420
2393
} else {
1421
2394
af = AF_INET;
1422
2395
}
2396
address = connect_to;
1423
2397
1424
2398
if(quit_now){
1425
2399
goto end;
1426
2400
}
1427
2401
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2402
while(not quit_now){
2403
ret = start_mandos_communication(address, port, if_index, af,
2404
&mc);
2405
if(quit_now or ret == 0){
2406
break;
2407
}
2408
if(debug){
2409
fprintf_plus(stderr, "Retrying in %d seconds\n",
2410
(int)retry_interval);
2411
}
2412
sleep((unsigned int)retry_interval);
2413
}
2414
2415
if(not quit_now){
1432
2416
exitcode = EXIT_SUCCESS;
1433
2417
}
2418
1434
2419
goto end;
1435
2420
}
1436
2421
1448
2433
config.publish_domain = 0;
1449
2434
1450
2435
/* Allocate a new server */
1451
mc.server = avahi_server_new(avahi_simple_poll_get
1452
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2437
&config, NULL, NULL, &ret_errno);
1454
2438
1455
2439
/* Free the Avahi configuration data */
1456
2440
avahi_server_config_free(&config);
1458
2442
1459
2443
/* Check if creating the Avahi server object succeeded */
1460
2444
if(mc.server == NULL){
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2445
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2446
avahi_strerror(ret_errno));
2447
exitcode = EX_UNAVAILABLE;
1464
2448
goto end;
1465
2449
}
1466
2450
1471
2455
/* Create the Avahi service browser */
1472
2456
sb = avahi_s_service_browser_new(mc.server, if_index,
1473
2457
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
NULL, 0, browse_callback, NULL);
2458
NULL, 0, browse_callback,
2459
(void *)&mc);
1475
2460
if(sb == NULL){
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2461
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2462
avahi_strerror(avahi_server_errno(mc.server)));
2463
exitcode = EX_UNAVAILABLE;
1479
2464
goto end;
1480
2465
}
1481
2466
1486
2471
/* Run the main loop */
1487
2472
1488
2473
if(debug){
1489
fprintf(stderr, "Starting Avahi loop search\n");
1490
}
1491
1492
avahi_simple_poll_loop(mc.simple_poll);
2474
fprintf_plus(stderr, "Starting Avahi loop search\n");
2475
}
2476
2477
ret = avahi_loop_with_timeout(simple_poll,
2478
(int)(retry_interval * 1000), &mc);
2479
if(debug){
2480
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2481
(ret == 0) ? "successfully" : "with error");
2482
}
1493
2483
1494
2484
end:
1495
2485
1496
2486
if(debug){
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2487
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1498
2488
}
1499
2489
1500
2490
/* Cleanup things */
2491
free(mc.interfaces);
2492
1501
2493
if(sb != NULL)
1502
2494
avahi_s_service_browser_free(sb);
1503
2495
1504
2496
if(mc.server != NULL)
1505
2497
avahi_server_free(mc.server);
1506
2498
1507
if(mc.simple_poll != NULL)
1508
avahi_simple_poll_free(mc.simple_poll);
2499
if(simple_poll != NULL)
2500
avahi_simple_poll_free(simple_poll);
1509
2501
1510
2502
if(gnutls_initialized){
1511
2503
gnutls_certificate_free_credentials(mc.cred);
1517
2509
gpgme_release(mc.ctx);
1518
2510
}
1519
2511
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
1549
}
1550
}
1551
1552
/* Removes the temp directory used by GPGME */
2512
/* Cleans up the circular linked list of Mandos servers the client
2513
has seen */
2514
if(mc.current_server != NULL){
2515
mc.current_server->prev->next = NULL;
2516
while(mc.current_server != NULL){
2517
server *next = mc.current_server->next;
2518
free(mc.current_server);
2519
mc.current_server = next;
2520
}
2521
}
2522
2523
/* Re-raise privileges */
2524
{
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
2527
perror_plus("Failed to raise privileges");
2528
} else {
2529
2530
/* Run network hooks */
2531
run_network_hooks("stop", interfaces_hooks != NULL ?
2532
interfaces_hooks : "", delay);
2533
2534
/* Take down the network interfaces which were brought up */
2535
{
2536
char *interface = NULL;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
2543
perror_plus("Failed to take down interface");
2544
}
2545
}
2546
if(debug and (interfaces_to_take_down == NULL)){
2547
fprintf_plus(stderr, "No interfaces needed to be taken"
2548
" down\n");
2549
}
2550
}
2551
}
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
2554
perror_plus("Failed to lower privileges permanently");
2555
}
2556
}
2557
2558
free(interfaces_to_take_down);
2559
free(interfaces_hooks);
2560
2561
/* Removes the GPGME temp directory and all files inside */
1553
2562
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
2563
struct dirent **direntries = NULL;
2564
struct dirent *direntry = NULL;
2565
int numentries = scandir(tempdir, &direntries, notdotentries,
2566
alphasort);
2567
if(numentries > 0){
2568
for(int i = 0; i < numentries; i++){
2569
direntry = direntries[i];
1574
2570
char *fullname = NULL;
1575
2571
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
2572
direntry->d_name);
1577
2573
if(ret < 0){
1578
perror("asprintf");
2574
perror_plus("asprintf");
1579
2575
continue;
1580
2576
}
1581
2577
ret = remove(fullname);
1582
2578
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
2579
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2580
strerror(errno));
1585
2581
}
1586
2582
free(fullname);
1587
2583
}
1588
closedir(d);
2584
}
2585
2586
/* need to clean even if 0 because man page doesn't specify */
2587
free(direntries);
2588
if(numentries == -1){
2589
perror_plus("scandir");
1589
2590
}
1590
2591
ret = rmdir(tempdir);
1591
2592
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
2593
perror_plus("rmdir");
1593
2594
}
1594
2595
}
1595
2596
1600
2601
&old_sigterm_action,
1601
2602
NULL));
1602
2603
if(ret == -1){
1603
perror("sigaction");
2604
perror_plus("sigaction");
1604
2605
}
1605
2606
do {
1606
2607
ret = raise(signal_received);
1607
2608
} while(ret != 0 and errno == EINTR);
1608
2609
if(ret != 0){
1609
perror("raise");
2610
perror_plus("raise");
1610
2611
abort();
1611
2612
}
1612
2613
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0