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- Committer: Teddy Hogeborn
- Date: 2008-09-30 03:19:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20080930031939-t72se4dhr632o9ct
* Makefile: Add HTML rules for manual pages.
(DOCBOOKTOHTML, HTMLPOST): New commands.
(htmldocs): New file list.
(html, install-html): New targets.
(.PHONY, clean): Added "html".
* README (The Plugin System): New section; describe plugin system.
* debian/control (Uploaders): New field.
* mandos-options.xml (servicename): Improve wording.
* plugins.d/mandos-client.xml (SECURITY): Improve wording.
(DOCBOOKTOHTML, HTMLPOST): New commands.
(htmldocs): New file list.
(html, install-html): New targets.
(.PHONY, clean): Added "html".
* README (The Plugin System): New section; describe plugin system.
* debian/control (Uploaders): New field.
* mandos-options.xml (servicename): Improve wording.
* plugins.d/mandos-client.xml (SECURITY): Improve wording.
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
13
*
14
* This program is free software: you can redistribute it and/or
15
* modify it under the terms of the GNU General Public License as
16
* published by the Free Software Foundation, either version 3 of the
17
* License, or (at your option) any later version.
18
*
19
* This program is distributed in the hope that it will be useful, but
23
20
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
21
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
22
* General Public License for more details.
26
23
*
27
24
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
25
* along with this program. If not, see
26
* <http://www.gnu.org/licenses/>.
29
27
*
30
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
31
29
*/
32
30
33
31
/* Needed by GPGME, specifically gpgme_data_seek() */
34
#ifndef _LARGEFILE_SOURCE
35
32
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
37
#ifndef _FILE_OFFSET_BITS
38
33
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
40
34
41
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
36
43
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
38
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
#include <stdint.h> /* uint16_t, uint32_t */
46
40
#include <stddef.h> /* NULL, size_t, ssize_t */
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
strtof(), abort() */
49
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
53
#include <sys/ioctl.h> /* ioctl */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
54
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
48
sockaddr_in6, PF_INET6,
56
SOCK_STREAM, uid_t, gid_t, open(),
57
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
59
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
*/
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
72
program_invocation_short_name */
73
#include <time.h> /* nanosleep(), time(), sleep() */
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
74
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
62
SIOCSIFFLAGS, if_indextoname(),
76
63
if_nametoindex(), IF_NAMESIZE */
77
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
78
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
79
*/
64
#include <netinet/in.h>
80
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
85
#include <iso646.h> /* not, or, and */
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
86
70
#include <argp.h> /* struct argp_option, error_t, struct
87
71
argp_state, struct argp,
88
72
argp_parse(), ARGP_KEY_ARG,
89
73
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
90
#include <signal.h> /* sigemptyset(), sigaddset(),
91
sigaction(), SIGTERM, sig_atomic_t,
92
raise() */
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
105
#ifdef __linux__
106
#include <sys/klog.h> /* klogctl() */
107
#endif /* __linux__ */
108
74
109
75
/* Avahi */
110
76
/* All Avahi types, constants and functions
123
89
gnutls_*
124
90
init_gnutls_session(),
125
91
GNUTLS_* */
126
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
129
94
130
95
/* GPGME */
131
96
#include <gpgme.h> /* All GPGME types, constants and
136
101
137
102
#define BUFFER_SIZE 256
138
103
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
139
108
#define PATHDIR "/conf/conf.d/mandos"
140
109
#define SECKEY "seckey.txt"
141
110
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
143
111
144
112
bool debug = false;
145
113
static const char mandos_protocol_version[] = "1";
146
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
static const char sys_class_net[] = "/sys/class/net";
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
157
const char *ip;
158
in_port_t port;
159
AvahiIfIndex if_index;
160
int af;
161
struct timespec last_seen;
162
struct server *next;
163
struct server *prev;
164
} server;
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
165
116
166
117
/* Used for passing in values through the Avahi callback functions */
167
118
typedef struct {
119
AvahiSimplePoll *simple_poll;
168
120
AvahiServer *server;
169
121
gnutls_certificate_credentials_t cred;
170
122
unsigned int dh_bits;
171
123
gnutls_dh_params_t dh_params;
172
124
const char *priority;
173
125
gpgme_ctx_t ctx;
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
126
} mandos_context;
178
127
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
181
182
sig_atomic_t quit_now = 0;
183
int signal_received = 0;
184
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
187
int e = errno;
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
190
errno = e;
191
perror(print_text);
192
}
193
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
203
204
128
/*
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
* bytes. "buffer_capacity" is how much is currently allocated,
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
207
131
* "buffer_length" is how much is already used.
208
132
*/
209
__attribute__((nonnull, warn_unused_result))
210
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
219
138
return 0;
220
139
}
221
*buffer = new_buf;
222
140
buffer_capacity += BUFFER_SIZE;
223
141
}
224
142
return buffer_capacity;
225
143
}
226
144
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
231
int ret;
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
235
return false;
236
}
237
*new_server = (server){ .ip = strdup(ip),
238
.port = port,
239
.if_index = if_index,
240
.af = af };
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
259
}
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
265
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
273
}
274
275
145
/*
276
146
* Initialize GPGME.
277
147
*/
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
283
151
gpgme_error_t rc;
284
152
gpgme_engine_info_t engine_info;
285
153
154
286
155
/*
287
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
288
157
*/
289
bool import_key(const char * const filename){
290
int ret;
158
bool import_key(const char *filename){
291
159
int fd;
292
160
gpgme_data_t pgp_data;
293
161
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
295
163
if(fd == -1){
296
perror_plus("open");
164
perror("open");
297
165
return false;
298
166
}
299
167
300
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
304
172
return false;
305
173
}
306
174
307
175
rc = gpgme_op_import(mc->ctx, pgp_data);
308
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
311
179
return false;
312
180
}
313
{
314
gpgme_import_result_t import_result
315
= gpgme_op_import_result(mc->ctx);
316
if((import_result->imported < 1
317
or import_result->not_imported > 0)
318
and import_result->unchanged == 0){
319
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
320
fprintf_plus(stderr,
321
"The total number of considered keys: %d\n",
322
import_result->considered);
323
fprintf_plus(stderr,
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
326
fprintf_plus(stderr,
327
"The total number of imported keys: %d\n",
328
import_result->imported);
329
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
330
import_result->imported_rsa);
331
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
332
import_result->unchanged);
333
fprintf_plus(stderr, "The number of new user IDs: %d\n",
334
import_result->new_user_ids);
335
fprintf_plus(stderr, "The number of new sub keys: %d\n",
336
import_result->new_sub_keys);
337
fprintf_plus(stderr, "The number of new signatures: %d\n",
338
import_result->new_signatures);
339
fprintf_plus(stderr, "The number of new revocations: %d\n",
340
import_result->new_revocations);
341
fprintf_plus(stderr,
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
344
fprintf_plus(stderr,
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
347
fprintf_plus(stderr,
348
"The number of unchanged secret keys: %d\n",
349
import_result->secret_unchanged);
350
fprintf_plus(stderr, "The number of keys not imported: %d\n",
351
import_result->not_imported);
352
for(gpgme_import_status_t import_status
353
= import_result->imports;
354
import_status != NULL;
355
import_status = import_status->next){
356
fprintf_plus(stderr, "Import status for key: %s\n",
357
import_status->fpr);
358
if(import_status->result != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Import result: %s: %s\n",
360
gpgme_strsource(import_status->result),
361
gpgme_strerror(import_status->result));
362
}
363
fprintf_plus(stderr, "Key status:\n");
364
fprintf_plus(stderr,
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
368
fprintf_plus(stderr,
369
import_status->status & GPGME_IMPORT_UID
370
? "The key contained new user IDs.\n"
371
: "The key did not contain new user IDs.\n");
372
fprintf_plus(stderr,
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
376
fprintf_plus(stderr,
377
import_status->status & GPGME_IMPORT_SUBKEY
378
? "The key contained new sub keys.\n"
379
: "The key did not contain new sub keys.\n");
380
fprintf_plus(stderr,
381
import_status->status & GPGME_IMPORT_SECRET
382
? "The key contained a secret key.\n"
383
: "The key did not contain a secret key.\n");
384
}
385
return false;
386
}
387
}
388
181
389
ret = close(fd);
182
ret = TEMP_FAILURE_RETRY(close(fd));
390
183
if(ret == -1){
391
perror_plus("close");
184
perror("close");
392
185
}
393
186
gpgme_data_release(pgp_data);
394
187
return true;
395
188
}
396
189
397
if(debug){
398
fprintf_plus(stderr, "Initializing GPGME\n");
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
399
192
}
400
193
401
194
/* Init GPGME */
402
195
gpgme_check_version(NULL);
403
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
404
if(rc != GPG_ERR_NO_ERROR){
405
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
406
gpgme_strsource(rc), gpgme_strerror(rc));
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
407
200
return false;
408
201
}
409
202
410
/* Set GPGME home directory for the OpenPGP engine only */
411
rc = gpgme_get_engine_info(&engine_info);
412
if(rc != GPG_ERR_NO_ERROR){
413
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
415
208
return false;
416
209
}
417
210
while(engine_info != NULL){
423
216
engine_info = engine_info->next;
424
217
}
425
218
if(engine_info == NULL){
426
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
427
tempdir);
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
428
220
return false;
429
221
}
430
222
431
223
/* Create new GPGME "context" */
432
224
rc = gpgme_new(&(mc->ctx));
433
if(rc != GPG_ERR_NO_ERROR){
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
436
return false;
437
}
438
439
if(not import_key(pubkey) or not import_key(seckey)){
440
return false;
441
}
442
443
return true;
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
444
236
}
445
237
446
238
/*
447
239
* Decrypt OpenPGP data.
448
240
* Returns -1 on error
449
241
*/
450
__attribute__((nonnull, warn_unused_result))
451
static ssize_t pgp_packet_decrypt(const char *cryptotext,
452
size_t crypto_size,
453
char **plaintext,
454
mandos_context *mc){
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
455
246
gpgme_data_t dh_crypto, dh_plain;
456
247
gpgme_error_t rc;
457
248
ssize_t ret;
458
249
size_t plaintext_capacity = 0;
459
250
ssize_t plaintext_length = 0;
460
251
461
if(debug){
462
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
463
254
}
464
255
465
256
/* Create new GPGME data buffer from memory cryptotext */
466
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
467
258
0);
468
if(rc != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
470
gpgme_strsource(rc), gpgme_strerror(rc));
259
if (rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
471
262
return -1;
472
263
}
473
264
474
265
/* Create new empty GPGME data buffer for the plaintext */
475
266
rc = gpgme_data_new(&dh_plain);
476
if(rc != GPG_ERR_NO_ERROR){
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
478
gpgme_strsource(rc), gpgme_strerror(rc));
267
if (rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
479
270
gpgme_data_release(dh_crypto);
480
271
return -1;
481
272
}
483
274
/* Decrypt data from the cryptotext data buffer to the plaintext
484
275
data buffer */
485
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
486
if(rc != GPG_ERR_NO_ERROR){
487
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
488
gpgme_strsource(rc), gpgme_strerror(rc));
277
if (rc != GPG_ERR_NO_ERROR){
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
489
280
plaintext_length = -1;
490
if(debug){
281
if (debug){
491
282
gpgme_decrypt_result_t result;
492
283
result = gpgme_op_decrypt_result(mc->ctx);
493
if(result == NULL){
494
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
495
286
} else {
496
if(result->unsupported_algorithm != NULL) {
497
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
498
result->unsupported_algorithm);
499
}
500
fprintf_plus(stderr, "Wrong key usage: %s\n",
501
result->wrong_key_usage ? "Yes" : "No");
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
502
291
if(result->file_name != NULL){
503
fprintf_plus(stderr, "File name: %s\n", result->file_name);
292
fprintf(stderr, "File name: %s\n", result->file_name);
504
293
}
505
506
for(gpgme_recipient_t r = result->recipients; r != NULL;
507
r = r->next){
508
fprintf_plus(stderr, "Public key algorithm: %s\n",
509
gpgme_pubkey_algo_name(r->pubkey_algo));
510
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
511
fprintf_plus(stderr, "Secret key available: %s\n",
512
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
513
306
}
514
307
}
515
308
}
517
310
}
518
311
519
312
if(debug){
520
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
521
314
}
522
315
523
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
524
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
525
perror_plus("gpgme_data_seek");
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
526
319
plaintext_length = -1;
527
320
goto decrypt_end;
528
321
}
529
322
530
323
*plaintext = NULL;
531
324
while(true){
532
plaintext_capacity = incbuffer(plaintext,
533
(size_t)plaintext_length,
534
plaintext_capacity);
535
if(plaintext_capacity == 0){
536
perror_plus("incbuffer");
537
plaintext_length = -1;
538
goto decrypt_end;
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
539
332
}
540
333
541
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
542
335
BUFFER_SIZE);
543
336
/* Print the data, if any */
544
if(ret == 0){
337
if (ret == 0){
545
338
/* EOF */
546
339
break;
547
340
}
548
341
if(ret < 0){
549
perror_plus("gpgme_data_read");
342
perror("gpgme_data_read");
550
343
plaintext_length = -1;
551
344
goto decrypt_end;
552
345
}
554
347
}
555
348
556
349
if(debug){
557
fprintf_plus(stderr, "Decrypted password is: ");
350
fprintf(stderr, "Decrypted password is: ");
558
351
for(ssize_t i = 0; i < plaintext_length; i++){
559
352
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
560
353
}
571
364
return plaintext_length;
572
365
}
573
366
574
__attribute__((warn_unused_result, const))
575
static const char *safe_string(const char *str){
576
if(str == NULL)
577
return "(unknown)";
578
return str;
579
}
580
581
__attribute__((warn_unused_result))
582
static const char *safer_gnutls_strerror(int value){
583
const char *ret = gnutls_strerror(value);
584
return safe_string(ret);
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
370
ret = "(unknown)";
371
return ret;
585
372
}
586
373
587
374
/* GnuTLS log function callback */
588
__attribute__((nonnull))
589
375
static void debuggnutls(__attribute__((unused)) int level,
590
376
const char* string){
591
fprintf_plus(stderr, "GnuTLS: %s", string);
377
fprintf(stderr, "GnuTLS: %s", string);
592
378
}
593
379
594
__attribute__((nonnull(1, 2, 4), warn_unused_result))
595
static int init_gnutls_global(const char *pubkeyfilename,
596
const char *seckeyfilename,
597
const char *dhparamsfilename,
598
mandos_context *mc){
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
599
383
int ret;
600
unsigned int uret;
601
602
if(debug){
603
fprintf_plus(stderr, "Initializing GnuTLS\n");
604
}
605
606
if(debug){
384
385
if(debug){
386
fprintf(stderr, "Initializing GnuTLS\n");
387
}
388
389
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
393
return -1;
394
}
395
396
if (debug){
607
397
/* "Use a log level over 10 to enable all debugging options."
608
398
* - GnuTLS manual
609
399
*/
612
402
}
613
403
614
404
/* OpenPGP credentials */
615
ret = gnutls_certificate_allocate_credentials(&mc->cred);
616
if(ret != GNUTLS_E_SUCCESS){
617
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
618
safer_gnutls_strerror(ret));
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
619
411
return -1;
620
412
}
621
413
622
414
if(debug){
623
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
624
" secret key %s as GnuTLS credentials\n",
625
pubkeyfilename,
626
seckeyfilename);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
627
418
}
628
419
629
420
ret = gnutls_certificate_set_openpgp_key_file
630
421
(mc->cred, pubkeyfilename, seckeyfilename,
631
422
GNUTLS_OPENPGP_FMT_BASE64);
632
if(ret != GNUTLS_E_SUCCESS){
633
fprintf_plus(stderr,
634
"Error[%d] while reading the OpenPGP key pair ('%s',"
635
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
636
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
637
safer_gnutls_strerror(ret));
423
if (ret != GNUTLS_E_SUCCESS) {
424
fprintf(stderr,
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
428
safer_gnutls_strerror(ret));
638
429
goto globalfail;
639
430
}
640
431
641
432
/* GnuTLS server initialization */
642
433
ret = gnutls_dh_params_init(&mc->dh_params);
643
if(ret != GNUTLS_E_SUCCESS){
644
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
645
" initialization: %s\n",
646
safer_gnutls_strerror(ret));
647
goto globalfail;
648
}
649
/* If a Diffie-Hellman parameters file was given, try to use it */
650
if(dhparamsfilename != NULL){
651
gnutls_datum_t params = { .data = NULL, .size = 0 };
652
do {
653
int dhpfile = open(dhparamsfilename, O_RDONLY);
654
if(dhpfile == -1){
655
perror_plus("open");
656
dhparamsfilename = NULL;
657
break;
658
}
659
size_t params_capacity = 0;
660
while(true){
661
params_capacity = incbuffer((char **)¶ms.data,
662
(size_t)params.size,
663
(size_t)params_capacity);
664
if(params_capacity == 0){
665
perror_plus("incbuffer");
666
free(params.data);
667
params.data = NULL;
668
dhparamsfilename = NULL;
669
break;
670
}
671
ssize_t bytes_read = read(dhpfile,
672
params.data + params.size,
673
BUFFER_SIZE);
674
/* EOF */
675
if(bytes_read == 0){
676
break;
677
}
678
/* check bytes_read for failure */
679
if(bytes_read < 0){
680
perror_plus("read");
681
free(params.data);
682
params.data = NULL;
683
dhparamsfilename = NULL;
684
break;
685
}
686
params.size += (unsigned int)bytes_read;
687
}
688
ret = close(dhpfile);
689
if(ret == -1){
690
perror_plus("close");
691
}
692
if(params.data == NULL){
693
dhparamsfilename = NULL;
694
}
695
if(dhparamsfilename == NULL){
696
break;
697
}
698
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
699
GNUTLS_X509_FMT_PEM);
700
if(ret != GNUTLS_E_SUCCESS){
701
fprintf_plus(stderr, "Failed to parse DH parameters in file"
702
" \"%s\": %s\n", dhparamsfilename,
703
safer_gnutls_strerror(ret));
704
dhparamsfilename = NULL;
705
}
706
free(params.data);
707
} while(false);
708
}
709
if(dhparamsfilename == NULL){
710
if(mc->dh_bits == 0){
711
/* Find out the optimal number of DH bits */
712
/* Try to read the private key file */
713
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
714
do {
715
int secfile = open(seckeyfilename, O_RDONLY);
716
if(secfile == -1){
717
perror_plus("open");
718
break;
719
}
720
size_t buffer_capacity = 0;
721
while(true){
722
buffer_capacity = incbuffer((char **)&buffer.data,
723
(size_t)buffer.size,
724
(size_t)buffer_capacity);
725
if(buffer_capacity == 0){
726
perror_plus("incbuffer");
727
free(buffer.data);
728
buffer.data = NULL;
729
break;
730
}
731
ssize_t bytes_read = read(secfile,
732
buffer.data + buffer.size,
733
BUFFER_SIZE);
734
/* EOF */
735
if(bytes_read == 0){
736
break;
737
}
738
/* check bytes_read for failure */
739
if(bytes_read < 0){
740
perror_plus("read");
741
free(buffer.data);
742
buffer.data = NULL;
743
break;
744
}
745
buffer.size += (unsigned int)bytes_read;
746
}
747
close(secfile);
748
} while(false);
749
/* If successful, use buffer to parse private key */
750
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
751
if(buffer.data != NULL){
752
{
753
gnutls_openpgp_privkey_t privkey = NULL;
754
ret = gnutls_openpgp_privkey_init(&privkey);
755
if(ret != GNUTLS_E_SUCCESS){
756
fprintf_plus(stderr, "Error initializing OpenPGP key"
757
" structure: %s",
758
safer_gnutls_strerror(ret));
759
free(buffer.data);
760
buffer.data = NULL;
761
} else {
762
ret = gnutls_openpgp_privkey_import
763
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
764
if(ret != GNUTLS_E_SUCCESS){
765
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
766
safer_gnutls_strerror(ret));
767
privkey = NULL;
768
}
769
free(buffer.data);
770
buffer.data = NULL;
771
if(privkey != NULL){
772
/* Use private key to suggest an appropriate
773
sec_param */
774
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
775
gnutls_openpgp_privkey_deinit(privkey);
776
if(debug){
777
fprintf_plus(stderr, "This OpenPGP key implies using"
778
" a GnuTLS security parameter \"%s\".\n",
779
safe_string(gnutls_sec_param_get_name
780
(sec_param)));
781
}
782
}
783
}
784
}
785
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
786
/* Err on the side of caution */
787
sec_param = GNUTLS_SEC_PARAM_ULTRA;
788
if(debug){
789
fprintf_plus(stderr, "Falling back to security parameter"
790
" \"%s\"\n",
791
safe_string(gnutls_sec_param_get_name
792
(sec_param)));
793
}
794
}
795
}
796
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
797
if(uret != 0){
798
mc->dh_bits = uret;
799
if(debug){
800
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
801
" implies %u DH bits; using that.\n",
802
safe_string(gnutls_sec_param_get_name
803
(sec_param)),
804
mc->dh_bits);
805
}
806
} else {
807
fprintf_plus(stderr, "Failed to get implied number of DH"
808
" bits for security parameter \"%s\"): %s\n",
809
safe_string(gnutls_sec_param_get_name
810
(sec_param)),
811
safer_gnutls_strerror(ret));
812
goto globalfail;
813
}
814
} else if(debug){
815
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
816
mc->dh_bits);
817
}
818
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
819
if(ret != GNUTLS_E_SUCCESS){
820
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
821
" bits): %s\n", mc->dh_bits,
822
safer_gnutls_strerror(ret));
823
goto globalfail;
824
}
825
}
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
437
goto globalfail;
438
}
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
443
goto globalfail;
444
}
445
826
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
827
447
828
448
return 0;
830
450
globalfail:
831
451
832
452
gnutls_certificate_free_credentials(mc->cred);
453
gnutls_global_deinit();
833
454
gnutls_dh_params_deinit(mc->dh_params);
834
455
return -1;
835
456
}
836
457
837
__attribute__((nonnull, warn_unused_result))
838
static int init_gnutls_session(gnutls_session_t *session,
839
mandos_context *mc){
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
840
460
int ret;
841
461
/* GnuTLS session creation */
842
do {
843
ret = gnutls_init(session, GNUTLS_SERVER);
844
if(quit_now){
845
return -1;
846
}
847
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
848
if(ret != GNUTLS_E_SUCCESS){
849
fprintf_plus(stderr,
850
"Error in GnuTLS session initialization: %s\n",
851
safer_gnutls_strerror(ret));
462
ret = gnutls_init(session, GNUTLS_SERVER);
463
if (ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
safer_gnutls_strerror(ret));
852
466
}
853
467
854
468
{
855
469
const char *err;
856
do {
857
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
858
if(quit_now){
859
gnutls_deinit(*session);
860
return -1;
861
}
862
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
863
if(ret != GNUTLS_E_SUCCESS){
864
fprintf_plus(stderr, "Syntax error at: %s\n", err);
865
fprintf_plus(stderr, "GnuTLS error: %s\n",
866
safer_gnutls_strerror(ret));
867
gnutls_deinit(*session);
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if (ret != GNUTLS_E_SUCCESS) {
472
fprintf(stderr, "Syntax error at: %s\n", err);
473
fprintf(stderr, "GnuTLS error: %s\n",
474
safer_gnutls_strerror(ret));
475
gnutls_deinit (*session);
868
476
return -1;
869
477
}
870
478
}
871
479
872
do {
873
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
874
mc->cred);
875
if(quit_now){
876
gnutls_deinit(*session);
877
return -1;
878
}
879
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
880
if(ret != GNUTLS_E_SUCCESS){
881
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
882
safer_gnutls_strerror(ret));
883
gnutls_deinit(*session);
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
if (ret != GNUTLS_E_SUCCESS) {
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
safer_gnutls_strerror(ret));
485
gnutls_deinit (*session);
884
486
return -1;
885
487
}
886
488
887
489
/* ignore client certificate if any. */
888
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
492
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
889
494
890
495
return 0;
891
496
}
894
499
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
895
500
__attribute__((unused)) const char *txt){}
896
501
897
/* Set effective uid to 0, return errno */
898
__attribute__((warn_unused_result))
899
int raise_privileges(void){
900
int old_errno = errno;
901
int ret = 0;
902
if(seteuid(0) == -1){
903
ret = errno;
904
}
905
errno = old_errno;
906
return ret;
907
}
908
909
/* Set effective and real user ID to 0. Return errno. */
910
__attribute__((warn_unused_result))
911
int raise_privileges_permanently(void){
912
int old_errno = errno;
913
int ret = raise_privileges();
914
if(ret != 0){
915
errno = old_errno;
916
return ret;
917
}
918
if(setuid(0) == -1){
919
ret = errno;
920
}
921
errno = old_errno;
922
return ret;
923
}
924
925
/* Set effective user ID to unprivileged saved user ID */
926
__attribute__((warn_unused_result))
927
int lower_privileges(void){
928
int old_errno = errno;
929
int ret = 0;
930
if(seteuid(uid) == -1){
931
ret = errno;
932
}
933
errno = old_errno;
934
return ret;
935
}
936
937
/* Lower privileges permanently */
938
__attribute__((warn_unused_result))
939
int lower_privileges_permanently(void){
940
int old_errno = errno;
941
int ret = 0;
942
if(setuid(uid) == -1){
943
ret = errno;
944
}
945
errno = old_errno;
946
return ret;
947
}
948
949
/* Helper function to add_local_route() and delete_local_route() */
950
__attribute__((nonnull, warn_unused_result))
951
static bool add_delete_local_route(const bool add,
952
const char *address,
953
AvahiIfIndex if_index){
954
int ret;
955
char helper[] = "mandos-client-iprouteadddel";
956
char add_arg[] = "add";
957
char delete_arg[] = "delete";
958
char debug_flag[] = "--debug";
959
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
960
if(pluginhelperdir == NULL){
961
if(debug){
962
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
963
" variable not set; cannot run helper\n");
964
}
965
return false;
966
}
967
968
char interface[IF_NAMESIZE];
969
if(if_indextoname((unsigned int)if_index, interface) == NULL){
970
perror_plus("if_indextoname");
971
return false;
972
}
973
974
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
975
if(devnull == -1){
976
perror_plus("open(\"/dev/null\", O_RDONLY)");
977
return false;
978
}
979
pid_t pid = fork();
980
if(pid == 0){
981
/* Child */
982
/* Raise privileges */
983
errno = raise_privileges_permanently();
984
if(errno != 0){
985
perror_plus("Failed to raise privileges");
986
/* _exit(EX_NOPERM); */
987
} else {
988
/* Set group */
989
errno = 0;
990
ret = setgid(0);
991
if(ret == -1){
992
perror_plus("setgid");
993
_exit(EX_NOPERM);
994
}
995
/* Reset supplementary groups */
996
errno = 0;
997
ret = setgroups(0, NULL);
998
if(ret == -1){
999
perror_plus("setgroups");
1000
_exit(EX_NOPERM);
1001
}
1002
}
1003
ret = dup2(devnull, STDIN_FILENO);
1004
if(ret == -1){
1005
perror_plus("dup2(devnull, STDIN_FILENO)");
1006
_exit(EX_OSERR);
1007
}
1008
ret = close(devnull);
1009
if(ret == -1){
1010
perror_plus("close");
1011
_exit(EX_OSERR);
1012
}
1013
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1014
if(ret == -1){
1015
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1016
_exit(EX_OSERR);
1017
}
1018
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1019
O_RDONLY
1020
| O_DIRECTORY
1021
| O_PATH
1022
| O_CLOEXEC));
1023
if(helperdir_fd == -1){
1024
perror_plus("open");
1025
_exit(EX_UNAVAILABLE);
1026
}
1027
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1028
helper, O_RDONLY));
1029
if(helper_fd == -1){
1030
perror_plus("openat");
1031
close(helperdir_fd);
1032
_exit(EX_UNAVAILABLE);
1033
}
1034
close(helperdir_fd);
1035
#ifdef __GNUC__
1036
#pragma GCC diagnostic push
1037
#pragma GCC diagnostic ignored "-Wcast-qual"
1038
#endif
1039
if(fexecve(helper_fd, (char *const [])
1040
{ helper, add ? add_arg : delete_arg, (char *)address,
1041
interface, debug ? debug_flag : NULL, NULL },
1042
environ) == -1){
1043
#ifdef __GNUC__
1044
#pragma GCC diagnostic pop
1045
#endif
1046
perror_plus("fexecve");
1047
_exit(EXIT_FAILURE);
1048
}
1049
}
1050
if(pid == -1){
1051
perror_plus("fork");
1052
return false;
1053
}
1054
int status;
1055
pid_t pret = -1;
1056
errno = 0;
1057
do {
1058
pret = waitpid(pid, &status, 0);
1059
if(pret == -1 and errno == EINTR and quit_now){
1060
int errno_raising = 0;
1061
if((errno = raise_privileges()) != 0){
1062
errno_raising = errno;
1063
perror_plus("Failed to raise privileges in order to"
1064
" kill helper program");
1065
}
1066
if(kill(pid, SIGTERM) == -1){
1067
perror_plus("kill");
1068
}
1069
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1070
perror_plus("Failed to lower privileges after killing"
1071
" helper program");
1072
}
1073
return false;
1074
}
1075
} while(pret == -1 and errno == EINTR);
1076
if(pret == -1){
1077
perror_plus("waitpid");
1078
return false;
1079
}
1080
if(WIFEXITED(status)){
1081
if(WEXITSTATUS(status) != 0){
1082
fprintf_plus(stderr, "Error: iprouteadddel exited"
1083
" with status %d\n", WEXITSTATUS(status));
1084
return false;
1085
}
1086
return true;
1087
}
1088
if(WIFSIGNALED(status)){
1089
fprintf_plus(stderr, "Error: iprouteadddel died by"
1090
" signal %d\n", WTERMSIG(status));
1091
return false;
1092
}
1093
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1094
return false;
1095
}
1096
1097
__attribute__((nonnull, warn_unused_result))
1098
static bool add_local_route(const char *address,
1099
AvahiIfIndex if_index){
1100
if(debug){
1101
fprintf_plus(stderr, "Adding route to %s\n", address);
1102
}
1103
return add_delete_local_route(true, address, if_index);
1104
}
1105
1106
__attribute__((nonnull, warn_unused_result))
1107
static bool delete_local_route(const char *address,
1108
AvahiIfIndex if_index){
1109
if(debug){
1110
fprintf_plus(stderr, "Removing route to %s\n", address);
1111
}
1112
return add_delete_local_route(false, address, if_index);
1113
}
1114
1115
502
/* Called when a Mandos server is found */
1116
__attribute__((nonnull, warn_unused_result))
1117
static int start_mandos_communication(const char *ip, in_port_t port,
503
static int start_mandos_communication(const char *ip, uint16_t port,
1118
504
AvahiIfIndex if_index,
1119
int af, mandos_context *mc){
1120
int ret, tcp_sd = -1;
1121
ssize_t sret;
1122
struct sockaddr_storage to;
505
mandos_context *mc){
506
int ret, tcp_sd;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1123
508
char *buffer = NULL;
1124
char *decrypted_buffer = NULL;
509
char *decrypted_buffer;
1125
510
size_t buffer_length = 0;
1126
511
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
1127
513
size_t written;
1128
int retval = -1;
514
int retval = 0;
515
char interface[IF_NAMESIZE];
1129
516
gnutls_session_t session;
1130
int pf; /* Protocol family */
1131
bool route_added = false;
1132
1133
errno = 0;
1134
1135
if(quit_now){
1136
errno = EINTR;
1137
return -1;
1138
}
1139
1140
switch(af){
1141
case AF_INET6:
1142
pf = PF_INET6;
1143
break;
1144
case AF_INET:
1145
pf = PF_INET;
1146
break;
1147
default:
1148
fprintf_plus(stderr, "Bad address family: %d\n", af);
1149
errno = EINVAL;
1150
return -1;
1151
}
1152
1153
/* If the interface is specified and we have a list of interfaces */
1154
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1155
/* Check if the interface is one of the interfaces we are using */
1156
bool match = false;
1157
{
1158
char *interface = NULL;
1159
while((interface = argz_next(mc->interfaces,
1160
mc->interfaces_size,
1161
interface))){
1162
if(if_nametoindex(interface) == (unsigned int)if_index){
1163
match = true;
1164
break;
1165
}
1166
}
1167
}
1168
if(not match){
1169
/* This interface does not match any in the list, so we don't
1170
connect to the server */
1171
if(debug){
1172
char interface[IF_NAMESIZE];
1173
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1174
perror_plus("if_indextoname");
1175
} else {
1176
fprintf_plus(stderr, "Skipping server on non-used interface"
1177
" \"%s\"\n",
1178
if_indextoname((unsigned int)if_index,
1179
interface));
1180
}
1181
}
517
518
ret = init_gnutls_session (mc, &session);
519
if (ret != 0){
520
return -1;
521
}
522
523
if(debug){
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
525
"\n", ip, port);
526
}
527
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
530
perror("socket");
531
return -1;
532
}
533
534
if(debug){
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
536
perror("if_indextoname");
1182
537
return -1;
1183
538
}
539
fprintf(stderr, "Binding to interface %s\n", interface);
1184
540
}
1185
541
1186
ret = init_gnutls_session(&session, mc);
1187
if(ret != 0){
542
memset(&to, 0, sizeof(to));
543
to.in6.sin6_family = AF_INET6;
544
/* It would be nice to have a way to detect if we were passed an
545
IPv4 address here. Now we assume an IPv6 address. */
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
547
if (ret < 0 ){
548
perror("inet_pton");
1188
549
return -1;
1189
550
}
1190
1191
if(debug){
1192
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1193
PRIuMAX "\n", ip, (uintmax_t)port);
1194
}
1195
1196
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1197
if(tcp_sd < 0){
1198
int e = errno;
1199
perror_plus("socket");
1200
errno = e;
1201
goto mandos_end;
1202
}
1203
1204
if(quit_now){
1205
errno = EINTR;
1206
goto mandos_end;
1207
}
1208
1209
if(af == AF_INET6){
1210
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1211
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1212
ret = inet_pton(af, ip, &to6->sin6_addr);
1213
} else { /* IPv4 */
1214
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1215
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1216
ret = inet_pton(af, ip, &to4->sin_addr);
1217
}
1218
if(ret < 0 ){
1219
int e = errno;
1220
perror_plus("inet_pton");
1221
errno = e;
1222
goto mandos_end;
1223
}
1224
551
if(ret == 0){
1225
int e = errno;
1226
fprintf_plus(stderr, "Bad address: %s\n", ip);
1227
errno = e;
1228
goto mandos_end;
1229
}
1230
if(af == AF_INET6){
1231
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1232
if(IN6_IS_ADDR_LINKLOCAL
1233
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1234
if(if_index == AVAHI_IF_UNSPEC){
1235
fprintf_plus(stderr, "An IPv6 link-local address is"
1236
" incomplete without a network interface\n");
1237
errno = EINVAL;
1238
goto mandos_end;
1239
}
1240
/* Set the network interface number as scope */
1241
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1242
}
1243
} else {
1244
((struct sockaddr_in *)&to)->sin_port = htons(port);
1245
}
552
fprintf(stderr, "Bad address: %s\n", ip);
553
return -1;
554
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
1246
556
1247
if(quit_now){
1248
errno = EINTR;
1249
goto mandos_end;
1250
}
557
to.in6.sin6_scope_id = (uint32_t)if_index;
1251
558
1252
559
if(debug){
1253
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1254
char interface[IF_NAMESIZE];
1255
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1256
perror_plus("if_indextoname");
1257
} else {
1258
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1259
"\n", ip, interface, (uintmax_t)port);
1260
}
1261
} else {
1262
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1263
ip, (uintmax_t)port);
1264
}
1265
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1266
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1267
if(af == AF_INET6){
1268
ret = getnameinfo((struct sockaddr *)&to,
1269
sizeof(struct sockaddr_in6),
1270
addrstr, sizeof(addrstr), NULL, 0,
1271
NI_NUMERICHOST);
1272
} else {
1273
ret = getnameinfo((struct sockaddr *)&to,
1274
sizeof(struct sockaddr_in),
1275
addrstr, sizeof(addrstr), NULL, 0,
1276
NI_NUMERICHOST);
1277
}
1278
if(ret == EAI_SYSTEM){
1279
perror_plus("getnameinfo");
1280
} else if(ret != 0) {
1281
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1282
} else if(strcmp(addrstr, ip) != 0){
1283
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1284
}
1285
}
1286
1287
if(quit_now){
1288
errno = EINTR;
1289
goto mandos_end;
1290
}
1291
1292
while(true){
1293
if(af == AF_INET6){
1294
ret = connect(tcp_sd, (struct sockaddr *)&to,
1295
sizeof(struct sockaddr_in6));
1296
} else {
1297
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1298
sizeof(struct sockaddr_in));
1299
}
1300
if(ret < 0){
1301
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1302
and if_index != AVAHI_IF_UNSPEC
1303
and connect_to == NULL
1304
and not route_added and
1305
((af == AF_INET6 and not
1306
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1307
&to)->sin6_addr)))
1308
or (af == AF_INET and
1309
/* Not a a IPv4LL address */
1310
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1311
& 0xFFFF0000L) != 0xA9FE0000L))){
1312
/* Work around Avahi bug - Avahi does not announce link-local
1313
addresses if it has a global address, so local hosts with
1314
*only* a link-local address (e.g. Mandos clients) cannot
1315
connect to a Mandos server announced by Avahi on a server
1316
host with a global address. Work around this by retrying
1317
with an explicit route added with the server's address.
1318
1319
Avahi bug reference:
1320
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1321
https://bugs.debian.org/587961
1322
*/
1323
if(debug){
1324
fprintf_plus(stderr, "Mandos server unreachable, trying"
1325
" direct route\n");
1326
}
1327
int e = errno;
1328
route_added = add_local_route(ip, if_index);
1329
if(route_added){
1330
continue;
1331
}
1332
errno = e;
1333
}
1334
if(errno != ECONNREFUSED or debug){
1335
int e = errno;
1336
perror_plus("connect");
1337
errno = e;
1338
}
1339
goto mandos_end;
1340
}
1341
1342
if(quit_now){
1343
errno = EINTR;
1344
goto mandos_end;
1345
}
1346
break;
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
port);
562
char addrstr[INET6_ADDRSTRLEN] = "";
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
sizeof(addrstr)) == NULL){
565
perror("inet_ntop");
566
} else {
567
if(strcmp(addrstr, ip) != 0){
568
fprintf(stderr, "Canonical address form: %s\n", addrstr);
569
}
570
}
571
}
572
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
575
perror("connect");
576
return -1;
1347
577
}
1348
578
1349
579
const char *out = mandos_protocol_version;
1350
580
written = 0;
1351
while(true){
581
while (true){
1352
582
size_t out_size = strlen(out);
1353
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1354
out_size - written));
1355
if(ret == -1){
1356
int e = errno;
1357
perror_plus("write");
1358
errno = e;
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
out_size - written));
585
if (ret == -1){
586
perror("write");
587
retval = -1;
1359
588
goto mandos_end;
1360
589
}
1361
590
written += (size_t)ret;
1362
591
if(written < out_size){
1363
592
continue;
1364
593
} else {
1365
if(out == mandos_protocol_version){
594
if (out == mandos_protocol_version){
1366
595
written = 0;
1367
596
out = "\r\n";
1368
597
} else {
1369
598
break;
1370
599
}
1371
600
}
1372
1373
if(quit_now){
1374
errno = EINTR;
1375
goto mandos_end;
1376
}
1377
601
}
1378
602
1379
603
if(debug){
1380
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1381
}
1382
1383
if(quit_now){
1384
errno = EINTR;
1385
goto mandos_end;
1386
}
1387
1388
/* This casting via intptr_t is to eliminate warning about casting
1389
an int to a pointer type. This is exactly how the GnuTLS Guile
1390
function "set-session-transport-fd!" does it. */
1391
gnutls_transport_set_ptr(session,
1392
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1393
1394
if(quit_now){
1395
errno = EINTR;
1396
goto mandos_end;
1397
}
1398
1399
do {
1400
ret = gnutls_handshake(session);
1401
if(quit_now){
1402
errno = EINTR;
1403
goto mandos_end;
1404
}
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
}
606
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
609
do{
610
ret = gnutls_handshake (session);
1405
611
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1406
612
1407
if(ret != GNUTLS_E_SUCCESS){
613
if (ret != GNUTLS_E_SUCCESS){
1408
614
if(debug){
1409
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
1410
gnutls_perror(ret);
615
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
616
gnutls_perror (ret);
1411
617
}
1412
errno = EPROTO;
618
retval = -1;
1413
619
goto mandos_end;
1414
620
}
1415
621
1416
622
/* Read OpenPGP packet that contains the wanted password */
1417
623
1418
624
if(debug){
1419
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1420
" %s\n", ip);
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
626
ip);
1421
627
}
1422
628
1423
629
while(true){
1424
1425
if(quit_now){
1426
errno = EINTR;
1427
goto mandos_end;
1428
}
1429
1430
buffer_capacity = incbuffer(&buffer, buffer_length,
1431
buffer_capacity);
1432
if(buffer_capacity == 0){
1433
int e = errno;
1434
perror_plus("incbuffer");
1435
errno = e;
1436
goto mandos_end;
1437
}
1438
1439
if(quit_now){
1440
errno = EINTR;
1441
goto mandos_end;
1442
}
1443
1444
sret = gnutls_record_recv(session, buffer+buffer_length,
1445
BUFFER_SIZE);
1446
if(sret == 0){
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
631
buffer_capacity);
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
634
retval = -1;
635
goto mandos_end;
636
}
637
638
ret = gnutls_record_recv(session, buffer+buffer_length,
639
BUFFER_SIZE);
640
if (ret == 0){
1447
641
break;
1448
642
}
1449
if(sret < 0){
1450
switch(sret){
643
if (ret < 0){
644
switch(ret){
1451
645
case GNUTLS_E_INTERRUPTED:
1452
646
case GNUTLS_E_AGAIN:
1453
647
break;
1454
648
case GNUTLS_E_REHANDSHAKE:
1455
do {
1456
ret = gnutls_handshake(session);
1457
1458
if(quit_now){
1459
errno = EINTR;
1460
goto mandos_end;
1461
}
649
do{
650
ret = gnutls_handshake (session);
1462
651
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1463
if(ret < 0){
1464
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1465
"***\n");
1466
gnutls_perror(ret);
1467
errno = EPROTO;
652
if (ret < 0){
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
654
gnutls_perror (ret);
655
retval = -1;
1468
656
goto mandos_end;
1469
657
}
1470
658
break;
1471
659
default:
1472
fprintf_plus(stderr, "Unknown error while reading data from"
1473
" encrypted session with Mandos server\n");
1474
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1475
errno = EIO;
660
fprintf(stderr, "Unknown error while reading data from"
661
" encrypted session with Mandos server\n");
662
retval = -1;
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1476
664
goto mandos_end;
1477
665
}
1478
666
} else {
1479
buffer_length += (size_t) sret;
667
buffer_length += (size_t) ret;
1480
668
}
1481
669
}
1482
670
1483
671
if(debug){
1484
fprintf_plus(stderr, "Closing TLS session\n");
1485
}
1486
1487
if(quit_now){
1488
errno = EINTR;
1489
goto mandos_end;
1490
}
1491
1492
do {
1493
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1494
if(quit_now){
1495
errno = EINTR;
1496
goto mandos_end;
1497
}
1498
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1499
1500
if(buffer_length > 0){
1501
ssize_t decrypted_buffer_size;
1502
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1503
&decrypted_buffer, mc);
1504
if(decrypted_buffer_size >= 0){
1505
1506
clearerr(stdout);
672
fprintf(stderr, "Closing TLS session\n");
673
}
674
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
679
buffer_length,
680
&decrypted_buffer);
681
if (decrypted_buffer_size >= 0){
1507
682
written = 0;
1508
683
while(written < (size_t) decrypted_buffer_size){
1509
if(quit_now){
1510
errno = EINTR;
1511
goto mandos_end;
1512
}
1513
1514
ret = (int)fwrite(decrypted_buffer + written, 1,
1515
(size_t)decrypted_buffer_size - written,
1516
stdout);
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
1517
687
if(ret == 0 and ferror(stdout)){
1518
int e = errno;
1519
688
if(debug){
1520
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1521
strerror(errno));
689
fprintf(stderr, "Error writing encrypted data: %s\n",
690
strerror(errno));
1522
691
}
1523
errno = e;
1524
goto mandos_end;
692
retval = -1;
693
break;
1525
694
}
1526
695
written += (size_t)ret;
1527
696
}
1528
ret = fflush(stdout);
1529
if(ret != 0){
1530
int e = errno;
1531
if(debug){
1532
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1533
strerror(errno));
1534
}
1535
errno = e;
1536
goto mandos_end;
1537
}
1538
retval = 0;
697
free(decrypted_buffer);
698
} else {
699
retval = -1;
1539
700
}
701
} else {
702
retval = -1;
1540
703
}
1541
704
1542
705
/* Shutdown procedure */
1543
706
1544
707
mandos_end:
1545
{
1546
if(route_added){
1547
if(not delete_local_route(ip, if_index)){
1548
fprintf_plus(stderr, "Failed to delete local route to %s on"
1549
" interface %d", ip, if_index);
1550
}
1551
}
1552
int e = errno;
1553
free(decrypted_buffer);
1554
free(buffer);
1555
if(tcp_sd >= 0){
1556
ret = close(tcp_sd);
1557
}
1558
if(ret == -1){
1559
if(e == 0){
1560
e = errno;
1561
}
1562
perror_plus("close");
1563
}
1564
gnutls_deinit(session);
1565
errno = e;
1566
if(quit_now){
1567
errno = EINTR;
1568
retval = -1;
1569
}
708
free(buffer);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
710
if(ret == -1){
711
perror("close");
1570
712
}
713
gnutls_deinit (session);
1571
714
return retval;
1572
715
}
1573
716
1574
717
static void resolve_callback(AvahiSServiceResolver *r,
1575
718
AvahiIfIndex interface,
1576
AvahiProtocol proto,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1577
720
AvahiResolverEvent event,
1578
721
const char *name,
1579
722
const char *type,
1584
727
AVAHI_GCC_UNUSED AvahiStringList *txt,
1585
728
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1586
729
flags,
1587
void *mc){
1588
if(r == NULL){
1589
return;
1590
}
730
void* userdata) {
731
mandos_context *mc = userdata;
732
assert(r);
1591
733
1592
734
/* Called whenever a service has been resolved successfully or
1593
735
timed out */
1594
736
1595
if(quit_now){
1596
avahi_s_service_resolver_free(r);
1597
return;
1598
}
1599
1600
switch(event){
737
switch (event) {
1601
738
default:
1602
739
case AVAHI_RESOLVER_FAILURE:
1603
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1604
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1605
domain,
1606
avahi_strerror(avahi_server_errno
1607
(((mandos_context*)mc)->server)));
740
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
741
" of type '%s' in domain '%s': %s\n", name, type, domain,
742
avahi_strerror(avahi_server_errno(mc->server)));
1608
743
break;
1609
744
1610
745
case AVAHI_RESOLVER_FOUND:
1612
747
char ip[AVAHI_ADDRESS_STR_MAX];
1613
748
avahi_address_snprint(ip, sizeof(ip), address);
1614
749
if(debug){
1615
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1616
PRIdMAX ") on port %" PRIu16 "\n", name,
1617
host_name, ip, (intmax_t)interface, port);
750
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
1618
753
}
1619
int ret = start_mandos_communication(ip, (in_port_t)port,
1620
interface,
1621
avahi_proto_to_af(proto),
1622
mc);
1623
if(ret == 0){
1624
avahi_simple_poll_quit(simple_poll);
1625
} else {
1626
if(not add_server(ip, (in_port_t)port, interface,
1627
avahi_proto_to_af(proto),
1628
&((mandos_context*)mc)->current_server)){
1629
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1630
" list\n", name);
1631
}
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
1632
757
}
1633
758
}
1634
759
}
1635
760
avahi_s_service_resolver_free(r);
1636
761
}
1637
762
1638
static void browse_callback(AvahiSServiceBrowser *b,
1639
AvahiIfIndex interface,
1640
AvahiProtocol protocol,
1641
AvahiBrowserEvent event,
1642
const char *name,
1643
const char *type,
1644
const char *domain,
1645
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1646
flags,
1647
void *mc){
1648
if(b == NULL){
1649
return;
1650
}
763
static void browse_callback( AvahiSServiceBrowser *b,
764
AvahiIfIndex interface,
765
AvahiProtocol protocol,
766
AvahiBrowserEvent event,
767
const char *name,
768
const char *type,
769
const char *domain,
770
AVAHI_GCC_UNUSED AvahiLookupResultFlags
771
flags,
772
void* userdata) {
773
mandos_context *mc = userdata;
774
assert(b);
1651
775
1652
776
/* Called whenever a new services becomes available on the LAN or
1653
777
is removed from the LAN */
1654
778
1655
if(quit_now){
1656
return;
1657
}
1658
1659
switch(event){
779
switch (event) {
1660
780
default:
1661
781
case AVAHI_BROWSER_FAILURE:
1662
782
1663
fprintf_plus(stderr, "(Avahi browser) %s\n",
1664
avahi_strerror(avahi_server_errno
1665
(((mandos_context*)mc)->server)));
1666
avahi_simple_poll_quit(simple_poll);
783
fprintf(stderr, "(Avahi browser) %s\n",
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
1667
786
return;
1668
787
1669
788
case AVAHI_BROWSER_NEW:
1672
791
the callback function is called the Avahi server will free the
1673
792
resolver for us. */
1674
793
1675
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1676
interface, protocol, name, type,
1677
domain, protocol, 0,
1678
resolve_callback, mc) == NULL)
1679
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1680
" %s\n", name,
1681
avahi_strerror(avahi_server_errno
1682
(((mandos_context*)mc)->server)));
794
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
protocol, name, type, domain,
796
AVAHI_PROTO_INET6, 0,
797
resolve_callback, mc)))
798
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
799
name, avahi_strerror(avahi_server_errno(mc->server)));
1683
800
break;
1684
801
1685
802
case AVAHI_BROWSER_REMOVE:
1688
805
case AVAHI_BROWSER_ALL_FOR_NOW:
1689
806
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1690
807
if(debug){
1691
fprintf_plus(stderr, "No Mandos server found, still"
1692
" searching...\n");
808
fprintf(stderr, "No Mandos server found, still searching...\n");
1693
809
}
1694
810
break;
1695
811
}
1696
812
}
1697
813
1698
/* Signal handler that stops main loop after SIGTERM */
1699
static void handle_sigterm(int sig){
1700
if(quit_now){
1701
return;
1702
}
1703
quit_now = 1;
1704
signal_received = sig;
1705
int old_errno = errno;
1706
/* set main loop to exit */
1707
if(simple_poll != NULL){
1708
avahi_simple_poll_quit(simple_poll);
1709
}
1710
errno = old_errno;
1711
}
1712
1713
__attribute__((nonnull, warn_unused_result))
1714
bool get_flags(const char *ifname, struct ifreq *ifr){
1715
int ret;
1716
int old_errno;
1717
1718
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1719
if(s < 0){
1720
old_errno = errno;
1721
perror_plus("socket");
1722
errno = old_errno;
1723
return false;
1724
}
1725
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1726
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1727
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1728
if(ret == -1){
1729
if(debug){
1730
old_errno = errno;
1731
perror_plus("ioctl SIOCGIFFLAGS");
1732
errno = old_errno;
1733
}
1734
if((close(s) == -1) and debug){
1735
old_errno = errno;
1736
perror_plus("close");
1737
errno = old_errno;
1738
}
1739
return false;
1740
}
1741
if((close(s) == -1) and debug){
1742
old_errno = errno;
1743
perror_plus("close");
1744
errno = old_errno;
1745
}
1746
return true;
1747
}
1748
1749
__attribute__((nonnull, warn_unused_result))
1750
bool good_flags(const char *ifname, const struct ifreq *ifr){
1751
1752
/* Reject the loopback device */
1753
if(ifr->ifr_flags & IFF_LOOPBACK){
1754
if(debug){
1755
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1756
ifname);
1757
}
1758
return false;
1759
}
1760
/* Accept point-to-point devices only if connect_to is specified */
1761
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1762
if(debug){
1763
fprintf_plus(stderr, "Accepting point-to-point interface"
1764
" \"%s\"\n", ifname);
1765
}
1766
return true;
1767
}
1768
/* Otherwise, reject non-broadcast-capable devices */
1769
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1770
if(debug){
1771
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1772
" \"%s\"\n", ifname);
1773
}
1774
return false;
1775
}
1776
/* Reject non-ARP interfaces (including dummy interfaces) */
1777
if(ifr->ifr_flags & IFF_NOARP){
1778
if(debug){
1779
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1780
ifname);
1781
}
1782
return false;
1783
}
1784
1785
/* Accept this device */
1786
if(debug){
1787
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1788
}
1789
return true;
1790
}
1791
1792
/*
1793
* This function determines if a directory entry in /sys/class/net
1794
* corresponds to an acceptable network device.
1795
* (This function is passed to scandir(3) as a filter function.)
1796
*/
1797
__attribute__((nonnull, warn_unused_result))
1798
int good_interface(const struct dirent *if_entry){
1799
if(if_entry->d_name[0] == '.'){
1800
return 0;
1801
}
1802
1803
struct ifreq ifr;
1804
if(not get_flags(if_entry->d_name, &ifr)){
1805
if(debug){
1806
fprintf_plus(stderr, "Failed to get flags for interface "
1807
"\"%s\"\n", if_entry->d_name);
1808
}
1809
return 0;
1810
}
1811
1812
if(not good_flags(if_entry->d_name, &ifr)){
1813
return 0;
1814
}
1815
return 1;
1816
}
1817
1818
/*
1819
* This function determines if a network interface is up.
1820
*/
1821
__attribute__((nonnull, warn_unused_result))
1822
bool interface_is_up(const char *interface){
1823
struct ifreq ifr;
1824
if(not get_flags(interface, &ifr)){
1825
if(debug){
1826
fprintf_plus(stderr, "Failed to get flags for interface "
1827
"\"%s\"\n", interface);
1828
}
1829
return false;
1830
}
1831
1832
return (bool)(ifr.ifr_flags & IFF_UP);
1833
}
1834
1835
/*
1836
* This function determines if a network interface is running
1837
*/
1838
__attribute__((nonnull, warn_unused_result))
1839
bool interface_is_running(const char *interface){
1840
struct ifreq ifr;
1841
if(not get_flags(interface, &ifr)){
1842
if(debug){
1843
fprintf_plus(stderr, "Failed to get flags for interface "
1844
"\"%s\"\n", interface);
1845
}
1846
return false;
1847
}
1848
1849
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1850
}
1851
1852
__attribute__((nonnull, pure, warn_unused_result))
1853
int notdotentries(const struct dirent *direntry){
1854
/* Skip "." and ".." */
1855
if(direntry->d_name[0] == '.'
1856
and (direntry->d_name[1] == '\0'
1857
or (direntry->d_name[1] == '.'
1858
and direntry->d_name[2] == '\0'))){
1859
return 0;
1860
}
1861
return 1;
1862
}
1863
1864
/* Is this directory entry a runnable program? */
1865
__attribute__((nonnull, warn_unused_result))
1866
int runnable_hook(const struct dirent *direntry){
1867
int ret;
1868
size_t sret;
1869
struct stat st;
1870
1871
if((direntry->d_name)[0] == '\0'){
1872
/* Empty name? */
1873
return 0;
1874
}
1875
1876
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1877
"abcdefghijklmnopqrstuvwxyz"
1878
"0123456789"
1879
"_.-");
1880
if((direntry->d_name)[sret] != '\0'){
1881
/* Contains non-allowed characters */
1882
if(debug){
1883
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1884
direntry->d_name);
1885
}
1886
return 0;
1887
}
1888
1889
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1890
if(ret == -1){
1891
if(debug){
1892
perror_plus("Could not stat hook");
1893
}
1894
return 0;
1895
}
1896
if(not (S_ISREG(st.st_mode))){
1897
/* Not a regular file */
1898
if(debug){
1899
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1900
direntry->d_name);
1901
}
1902
return 0;
1903
}
1904
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1905
/* Not executable */
1906
if(debug){
1907
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1908
direntry->d_name);
1909
}
1910
return 0;
1911
}
1912
if(debug){
1913
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1914
direntry->d_name);
1915
}
1916
return 1;
1917
}
1918
1919
__attribute__((nonnull, warn_unused_result))
1920
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1921
mandos_context *mc){
1922
int ret;
1923
struct timespec now;
1924
struct timespec waited_time;
1925
intmax_t block_time;
1926
1927
while(true){
1928
if(mc->current_server == NULL){
1929
if(debug){
1930
fprintf_plus(stderr, "Wait until first server is found."
1931
" No timeout!\n");
1932
}
1933
ret = avahi_simple_poll_iterate(s, -1);
1934
} else {
1935
if(debug){
1936
fprintf_plus(stderr, "Check current_server if we should run"
1937
" it, or wait\n");
1938
}
1939
/* the current time */
1940
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1941
if(ret == -1){
1942
perror_plus("clock_gettime");
1943
return -1;
1944
}
1945
/* Calculating in ms how long time between now and server
1946
who we visted longest time ago. Now - last seen. */
1947
waited_time.tv_sec = (now.tv_sec
1948
- mc->current_server->last_seen.tv_sec);
1949
waited_time.tv_nsec = (now.tv_nsec
1950
- mc->current_server->last_seen.tv_nsec);
1951
/* total time is 10s/10,000ms.
1952
Converting to s from ms by dividing by 1,000,
1953
and ns to ms by dividing by 1,000,000. */
1954
block_time = ((retry_interval
1955
- ((intmax_t)waited_time.tv_sec * 1000))
1956
- ((intmax_t)waited_time.tv_nsec / 1000000));
1957
1958
if(debug){
1959
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1960
block_time);
1961
}
1962
1963
if(block_time <= 0){
1964
ret = start_mandos_communication(mc->current_server->ip,
1965
mc->current_server->port,
1966
mc->current_server->if_index,
1967
mc->current_server->af, mc);
1968
if(ret == 0){
1969
avahi_simple_poll_quit(s);
1970
return 0;
1971
}
1972
ret = clock_gettime(CLOCK_MONOTONIC,
1973
&mc->current_server->last_seen);
1974
if(ret == -1){
1975
perror_plus("clock_gettime");
1976
return -1;
1977
}
1978
mc->current_server = mc->current_server->next;
1979
block_time = 0; /* Call avahi to find new Mandos
1980
servers, but don't block */
1981
}
1982
1983
ret = avahi_simple_poll_iterate(s, (int)block_time);
1984
}
1985
if(ret != 0){
1986
if(ret > 0 or errno != EINTR){
1987
return (ret != 1) ? ret : 0;
1988
}
1989
}
1990
}
1991
}
1992
1993
__attribute__((nonnull))
1994
void run_network_hooks(const char *mode, const char *interface,
1995
const float delay){
1996
struct dirent **direntries = NULL;
1997
if(hookdir_fd == -1){
1998
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1999
| O_CLOEXEC);
2000
if(hookdir_fd == -1){
2001
if(errno == ENOENT){
2002
if(debug){
2003
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2004
" found\n", hookdir);
2005
}
2006
} else {
2007
perror_plus("open");
2008
}
2009
return;
2010
}
2011
}
2012
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2013
if(devnull == -1){
2014
perror_plus("open(\"/dev/null\", O_RDONLY)");
2015
return;
2016
}
2017
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2018
runnable_hook, alphasort);
2019
if(numhooks == -1){
2020
perror_plus("scandir");
2021
close(devnull);
2022
return;
2023
}
2024
struct dirent *direntry;
2025
int ret;
2026
for(int i = 0; i < numhooks; i++){
2027
direntry = direntries[i];
2028
if(debug){
2029
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2030
direntry->d_name);
2031
}
2032
pid_t hook_pid = fork();
2033
if(hook_pid == 0){
2034
/* Child */
2035
/* Raise privileges */
2036
errno = raise_privileges_permanently();
2037
if(errno != 0){
2038
perror_plus("Failed to raise privileges");
2039
_exit(EX_NOPERM);
2040
}
2041
/* Set group */
2042
errno = 0;
2043
ret = setgid(0);
2044
if(ret == -1){
2045
perror_plus("setgid");
2046
_exit(EX_NOPERM);
2047
}
2048
/* Reset supplementary groups */
2049
errno = 0;
2050
ret = setgroups(0, NULL);
2051
if(ret == -1){
2052
perror_plus("setgroups");
2053
_exit(EX_NOPERM);
2054
}
2055
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2056
if(ret == -1){
2057
perror_plus("setenv");
2058
_exit(EX_OSERR);
2059
}
2060
ret = setenv("DEVICE", interface, 1);
2061
if(ret == -1){
2062
perror_plus("setenv");
2063
_exit(EX_OSERR);
2064
}
2065
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2066
if(ret == -1){
2067
perror_plus("setenv");
2068
_exit(EX_OSERR);
2069
}
2070
ret = setenv("MODE", mode, 1);
2071
if(ret == -1){
2072
perror_plus("setenv");
2073
_exit(EX_OSERR);
2074
}
2075
char *delaystring;
2076
ret = asprintf(&delaystring, "%f", (double)delay);
2077
if(ret == -1){
2078
perror_plus("asprintf");
2079
_exit(EX_OSERR);
2080
}
2081
ret = setenv("DELAY", delaystring, 1);
2082
if(ret == -1){
2083
free(delaystring);
2084
perror_plus("setenv");
2085
_exit(EX_OSERR);
2086
}
2087
free(delaystring);
2088
if(connect_to != NULL){
2089
ret = setenv("CONNECT", connect_to, 1);
2090
if(ret == -1){
2091
perror_plus("setenv");
2092
_exit(EX_OSERR);
2093
}
2094
}
2095
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2096
direntry->d_name,
2097
O_RDONLY));
2098
if(hook_fd == -1){
2099
perror_plus("openat");
2100
_exit(EXIT_FAILURE);
2101
}
2102
if(close(hookdir_fd) == -1){
2103
perror_plus("close");
2104
_exit(EXIT_FAILURE);
2105
}
2106
ret = dup2(devnull, STDIN_FILENO);
2107
if(ret == -1){
2108
perror_plus("dup2(devnull, STDIN_FILENO)");
2109
_exit(EX_OSERR);
2110
}
2111
ret = close(devnull);
2112
if(ret == -1){
2113
perror_plus("close");
2114
_exit(EX_OSERR);
2115
}
2116
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2117
if(ret == -1){
2118
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2119
_exit(EX_OSERR);
2120
}
2121
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2122
environ) == -1){
2123
perror_plus("fexecve");
2124
_exit(EXIT_FAILURE);
2125
}
2126
} else {
2127
if(hook_pid == -1){
2128
perror_plus("fork");
2129
free(direntry);
2130
continue;
2131
}
2132
int status;
2133
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2134
perror_plus("waitpid");
2135
free(direntry);
2136
continue;
2137
}
2138
if(WIFEXITED(status)){
2139
if(WEXITSTATUS(status) != 0){
2140
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2141
" with status %d\n", direntry->d_name,
2142
WEXITSTATUS(status));
2143
free(direntry);
2144
continue;
2145
}
2146
} else if(WIFSIGNALED(status)){
2147
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2148
" signal %d\n", direntry->d_name,
2149
WTERMSIG(status));
2150
free(direntry);
2151
continue;
2152
} else {
2153
fprintf_plus(stderr, "Warning: network hook \"%s\""
2154
" crashed\n", direntry->d_name);
2155
free(direntry);
2156
continue;
2157
}
2158
}
2159
if(debug){
2160
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2161
direntry->d_name);
2162
}
2163
free(direntry);
2164
}
2165
free(direntries);
2166
if(close(hookdir_fd) == -1){
2167
perror_plus("close");
2168
} else {
2169
hookdir_fd = -1;
2170
}
2171
close(devnull);
2172
}
2173
2174
__attribute__((nonnull, warn_unused_result))
2175
int bring_up_interface(const char *const interface,
2176
const float delay){
2177
int old_errno = errno;
2178
int ret;
2179
struct ifreq network;
2180
unsigned int if_index = if_nametoindex(interface);
2181
if(if_index == 0){
2182
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2183
errno = old_errno;
2184
return ENXIO;
2185
}
2186
2187
if(quit_now){
2188
errno = old_errno;
2189
return EINTR;
2190
}
2191
2192
if(not interface_is_up(interface)){
2193
int ret_errno = 0;
2194
int ioctl_errno = 0;
2195
if(not get_flags(interface, &network)){
2196
ret_errno = errno;
2197
fprintf_plus(stderr, "Failed to get flags for interface "
2198
"\"%s\"\n", interface);
2199
errno = old_errno;
2200
return ret_errno;
2201
}
2202
network.ifr_flags |= IFF_UP; /* set flag */
2203
2204
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2205
if(sd == -1){
2206
ret_errno = errno;
2207
perror_plus("socket");
2208
errno = old_errno;
2209
return ret_errno;
2210
}
2211
2212
if(quit_now){
2213
ret = close(sd);
2214
if(ret == -1){
2215
perror_plus("close");
2216
}
2217
errno = old_errno;
2218
return EINTR;
2219
}
2220
2221
if(debug){
2222
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2223
interface);
2224
}
2225
2226
/* Raise privileges */
2227
ret_errno = raise_privileges();
2228
if(ret_errno != 0){
2229
errno = ret_errno;
2230
perror_plus("Failed to raise privileges");
2231
}
2232
2233
#ifdef __linux__
2234
int ret_linux;
2235
bool restore_loglevel = false;
2236
if(ret_errno == 0){
2237
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2238
messages about the network interface to mess up the prompt */
2239
ret_linux = klogctl(8, NULL, 5);
2240
if(ret_linux == -1){
2241
perror_plus("klogctl");
2242
} else {
2243
restore_loglevel = true;
2244
}
2245
}
2246
#endif /* __linux__ */
2247
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2248
ioctl_errno = errno;
2249
#ifdef __linux__
2250
if(restore_loglevel){
2251
ret_linux = klogctl(7, NULL, 0);
2252
if(ret_linux == -1){
2253
perror_plus("klogctl");
2254
}
2255
}
2256
#endif /* __linux__ */
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2282
interface);
2283
}
2284
2285
/* Sleep checking until interface is running.
2286
Check every 0.25s, up to total time of delay */
2287
for(int i = 0; i < delay * 4; i++){
2288
if(interface_is_running(interface)){
2289
break;
2290
}
2291
struct timespec sleeptime = { .tv_nsec = 250000000 };
2292
ret = nanosleep(&sleeptime, NULL);
2293
if(ret == -1 and errno != EINTR){
2294
perror_plus("nanosleep");
2295
}
2296
}
2297
2298
errno = old_errno;
2299
return 0;
2300
}
2301
2302
__attribute__((nonnull, warn_unused_result))
2303
int take_down_interface(const char *const interface){
2304
int old_errno = errno;
2305
struct ifreq network;
2306
unsigned int if_index = if_nametoindex(interface);
2307
if(if_index == 0){
2308
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2309
errno = old_errno;
2310
return ENXIO;
2311
}
2312
if(interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network) and debug){
2316
ret_errno = errno;
2317
fprintf_plus(stderr, "Failed to get flags for interface "
2318
"\"%s\"\n", interface);
2319
errno = old_errno;
2320
return ret_errno;
2321
}
2322
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2323
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
2326
ret_errno = errno;
2327
perror_plus("socket");
2328
errno = old_errno;
2329
return ret_errno;
2330
}
2331
2332
if(debug){
2333
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2334
interface);
2335
}
2336
2337
/* Raise privileges */
2338
ret_errno = raise_privileges();
2339
if(ret_errno != 0){
2340
errno = ret_errno;
2341
perror_plus("Failed to raise privileges");
2342
}
2343
2344
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2345
ioctl_errno = errno;
2346
2347
/* If raise_privileges() succeeded above */
2348
if(ret_errno == 0){
2349
/* Lower privileges */
2350
ret_errno = lower_privileges();
2351
if(ret_errno != 0){
2352
errno = ret_errno;
2353
perror_plus("Failed to lower privileges");
2354
}
2355
}
2356
2357
/* Close the socket */
2358
int ret = close(sd);
2359
if(ret == -1){
2360
perror_plus("close");
2361
}
2362
2363
if(ret_setflags == -1){
2364
errno = ioctl_errno;
2365
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2366
errno = old_errno;
2367
return ioctl_errno;
2368
}
2369
} else if(debug){
2370
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2371
interface);
2372
}
2373
2374
errno = old_errno;
2375
return 0;
2376
}
2377
2378
814
int main(int argc, char *argv[]){
2379
mandos_context mc = { .server = NULL, .dh_bits = 0,
2380
.priority = "SECURE256:!CTYPE-X.509"
2381
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2382
.current_server = NULL, .interfaces = NULL,
2383
.interfaces_size = 0 };
2384
AvahiSServiceBrowser *sb = NULL;
2385
error_t ret_errno;
2386
int ret;
2387
intmax_t tmpmax;
2388
char *tmp;
2389
int exitcode = EXIT_SUCCESS;
2390
char *interfaces_to_take_down = NULL;
2391
size_t interfaces_to_take_down_size = 0;
2392
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2393
char old_tempdir[] = "/tmp/mandosXXXXXX";
2394
char *tempdir = NULL;
2395
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2396
const char *seckey = PATHDIR "/" SECKEY;
2397
const char *pubkey = PATHDIR "/" PUBKEY;
2398
const char *dh_params_file = NULL;
2399
char *interfaces_hooks = NULL;
2400
2401
bool gnutls_initialized = false;
2402
bool gpgme_initialized = false;
2403
float delay = 2.5f;
2404
double retry_interval = 10; /* 10s between trying a server and
2405
retrying the same server again */
2406
2407
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2408
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2409
2410
uid = getuid();
2411
gid = getgid();
2412
2413
/* Lower any group privileges we might have, just to be safe */
2414
errno = 0;
2415
ret = setgid(gid);
2416
if(ret == -1){
2417
perror_plus("setgid");
2418
}
2419
2420
/* Lower user privileges (temporarily) */
2421
errno = 0;
2422
ret = seteuid(uid);
2423
if(ret == -1){
2424
perror_plus("seteuid");
2425
}
2426
2427
if(quit_now){
2428
goto end;
2429
}
2430
2431
{
2432
struct argp_option options[] = {
2433
{ .name = "debug", .key = 128,
2434
.doc = "Debug mode", .group = 3 },
2435
{ .name = "connect", .key = 'c',
2436
.arg = "ADDRESS:PORT",
2437
.doc = "Connect directly to a specific Mandos server",
2438
.group = 1 },
2439
{ .name = "interface", .key = 'i',
2440
.arg = "NAME",
2441
.doc = "Network interface that will be used to search for"
2442
" Mandos servers",
2443
.group = 1 },
2444
{ .name = "seckey", .key = 's',
2445
.arg = "FILE",
2446
.doc = "OpenPGP secret key file base name",
2447
.group = 1 },
2448
{ .name = "pubkey", .key = 'p',
2449
.arg = "FILE",
2450
.doc = "OpenPGP public key file base name",
2451
.group = 2 },
2452
{ .name = "dh-bits", .key = 129,
2453
.arg = "BITS",
2454
.doc = "Bit length of the prime number used in the"
2455
" Diffie-Hellman key exchange",
2456
.group = 2 },
2457
{ .name = "dh-params", .key = 134,
2458
.arg = "FILE",
2459
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2460
" for the Diffie-Hellman key exchange",
2461
.group = 2 },
2462
{ .name = "priority", .key = 130,
2463
.arg = "STRING",
2464
.doc = "GnuTLS priority string for the TLS handshake",
2465
.group = 1 },
2466
{ .name = "delay", .key = 131,
2467
.arg = "SECONDS",
2468
.doc = "Maximum delay to wait for interface startup",
2469
.group = 2 },
2470
{ .name = "retry", .key = 132,
2471
.arg = "SECONDS",
2472
.doc = "Retry interval used when denied by the Mandos server",
2473
.group = 2 },
2474
{ .name = "network-hook-dir", .key = 133,
2475
.arg = "DIR",
2476
.doc = "Directory where network hooks are located",
2477
.group = 2 },
2478
/*
2479
* These reproduce what we would get without ARGP_NO_HELP
2480
*/
2481
{ .name = "help", .key = '?',
2482
.doc = "Give this help list", .group = -1 },
2483
{ .name = "usage", .key = -3,
2484
.doc = "Give a short usage message", .group = -1 },
2485
{ .name = "version", .key = 'V',
2486
.doc = "Print program version", .group = -1 },
2487
{ .name = NULL }
2488
};
2489
2490
error_t parse_opt(int key, char *arg,
2491
struct argp_state *state){
815
AvahiSServiceBrowser *sb = NULL;
816
int error;
817
int ret;
818
int exitcode = EXIT_SUCCESS;
819
const char *interface = "eth0";
820
struct ifreq network;
821
int sd;
822
uid_t uid;
823
gid_t gid;
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
829
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
835
836
{
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
843
.group = 1 },
844
{ .name = "interface", .key = 'i',
845
.arg = "NAME",
846
.doc = "Interface that will be used to search for Mandos"
847
" servers",
848
.group = 1 },
849
{ .name = "seckey", .key = 's',
850
.arg = "FILE",
851
.doc = "OpenPGP secret key file base name",
852
.group = 1 },
853
{ .name = "pubkey", .key = 'p',
854
.arg = "FILE",
855
.doc = "OpenPGP public key file base name",
856
.group = 2 },
857
{ .name = "dh-bits", .key = 129,
858
.arg = "BITS",
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
861
.group = 2 },
862
{ .name = "priority", .key = 130,
863
.arg = "STRING",
864
.doc = "GnuTLS priority string for the TLS handshake",
865
.group = 1 },
866
{ .name = NULL }
867
};
868
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
873
switch (key) {
874
case 128: /* --debug */
875
debug = true;
876
break;
877
case 'c': /* --connect */
878
connect_to = arg;
879
break;
880
case 'i': /* --interface */
881
interface = arg;
882
break;
883
case 's': /* --seckey */
884
seckey = arg;
885
break;
886
case 'p': /* --pubkey */
887
pubkey = arg;
888
break;
889
case 129: /* --dh-bits */
890
errno = 0;
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
892
if (errno){
893
perror("strtol");
894
exit(EXIT_FAILURE);
895
}
896
break;
897
case 130: /* --priority */
898
mc.priority = arg;
899
break;
900
case ARGP_KEY_ARG:
901
argp_usage (state);
902
case ARGP_KEY_END:
903
break;
904
default:
905
return ARGP_ERR_UNKNOWN;
906
}
907
return 0;
908
}
909
910
struct argp argp = { .options = options, .parser = parse_opt,
911
.args_doc = "",
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
922
/* If the interface is down, bring it up */
923
{
924
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
if(sd < 0) {
926
perror("socket");
927
exitcode = EXIT_FAILURE;
928
goto end;
929
}
930
strcpy(network.ifr_name, interface);
931
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
if(ret == -1){
933
perror("ioctl SIOCGIFFLAGS");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
if((network.ifr_flags & IFF_UP) == 0){
938
network.ifr_flags |= IFF_UP;
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCSIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
}
946
ret = TEMP_FAILURE_RETRY(close(sd));
947
if(ret == -1){
948
perror("close");
949
}
950
}
951
952
uid = getuid();
953
gid = getgid();
954
955
ret = setuid(uid);
956
if (ret == -1){
957
perror("setuid");
958
}
959
960
setgid(gid);
961
if (ret == -1){
962
perror("setgid");
963
}
964
965
ret = init_gnutls_global(&mc, pubkey, seckey);
966
if (ret == -1){
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
969
goto end;
970
} else {
971
gnutls_initalized = true;
972
}
973
974
if(mkdtemp(tempdir) == NULL){
975
perror("mkdtemp");
976
tempdir[0] = '\0';
977
goto end;
978
}
979
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
} else {
985
gpgme_initalized = true;
986
}
987
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
if(if_index == 0){
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
991
exit(EXIT_FAILURE);
992
}
993
994
if(connect_to != NULL){
995
/* Connect directly, do not use Zeroconf */
996
/* (Mainly meant for debugging) */
997
char *address = strrchr(connect_to, ':');
998
if(address == NULL){
999
fprintf(stderr, "No colon in address\n");
1000
exitcode = EXIT_FAILURE;
1001
goto end;
1002
}
2492
1003
errno = 0;
2493
switch(key){
2494
case 128: /* --debug */
2495
debug = true;
2496
break;
2497
case 'c': /* --connect */
2498
connect_to = arg;
2499
break;
2500
case 'i': /* --interface */
2501
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2502
arg, (int)',');
2503
if(ret_errno != 0){
2504
argp_error(state, "%s", strerror(ret_errno));
2505
}
2506
break;
2507
case 's': /* --seckey */
2508
seckey = arg;
2509
break;
2510
case 'p': /* --pubkey */
2511
pubkey = arg;
2512
break;
2513
case 129: /* --dh-bits */
2514
errno = 0;
2515
tmpmax = strtoimax(arg, &tmp, 10);
2516
if(errno != 0 or tmp == arg or *tmp != '\0'
2517
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2518
argp_error(state, "Bad number of DH bits");
2519
}
2520
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2521
break;
2522
case 134: /* --dh-params */
2523
dh_params_file = arg;
2524
break;
2525
case 130: /* --priority */
2526
mc.priority = arg;
2527
break;
2528
case 131: /* --delay */
2529
errno = 0;
2530
delay = strtof(arg, &tmp);
2531
if(errno != 0 or tmp == arg or *tmp != '\0'){
2532
argp_error(state, "Bad delay");
2533
}
2534
case 132: /* --retry */
2535
errno = 0;
2536
retry_interval = strtod(arg, &tmp);
2537
if(errno != 0 or tmp == arg or *tmp != '\0'
2538
or (retry_interval * 1000) > INT_MAX
2539
or retry_interval < 0){
2540
argp_error(state, "Bad retry interval");
2541
}
2542
break;
2543
case 133: /* --network-hook-dir */
2544
hookdir = arg;
2545
break;
2546
/*
2547
* These reproduce what we would get without ARGP_NO_HELP
2548
*/
2549
case '?': /* --help */
2550
argp_state_help(state, state->out_stream,
2551
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2552
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2553
case -3: /* --usage */
2554
argp_state_help(state, state->out_stream,
2555
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2556
case 'V': /* --version */
2557
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2558
exit(argp_err_exit_status);
2559
break;
2560
default:
2561
return ARGP_ERR_UNKNOWN;
2562
}
2563
return errno;
2564
}
2565
2566
struct argp argp = { .options = options, .parser = parse_opt,
2567
.args_doc = "",
2568
.doc = "Mandos client -- Get and decrypt"
2569
" passwords from a Mandos server" };
2570
ret_errno = argp_parse(&argp, argc, argv,
2571
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2572
switch(ret_errno){
2573
case 0:
2574
break;
2575
case ENOMEM:
2576
default:
2577
errno = ret_errno;
2578
perror_plus("argp_parse");
2579
exitcode = EX_OSERR;
2580
goto end;
2581
case EINVAL:
2582
exitcode = EX_USAGE;
2583
goto end;
2584
}
2585
}
2586
2587
{
2588
/* Work around Debian bug #633582:
2589
<https://bugs.debian.org/633582> */
2590
2591
/* Re-raise privileges */
2592
ret = raise_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to raise privileges");
2596
} else {
2597
struct stat st;
2598
2599
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2600
int seckey_fd = open(seckey, O_RDONLY);
2601
if(seckey_fd == -1){
2602
perror_plus("open");
2603
} else {
2604
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2605
if(ret == -1){
2606
perror_plus("fstat");
2607
} else {
2608
if(S_ISREG(st.st_mode)
2609
and st.st_uid == 0 and st.st_gid == 0){
2610
ret = fchown(seckey_fd, uid, gid);
2611
if(ret == -1){
2612
perror_plus("fchown");
2613
}
2614
}
2615
}
2616
close(seckey_fd);
2617
}
2618
}
2619
2620
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2621
int pubkey_fd = open(pubkey, O_RDONLY);
2622
if(pubkey_fd == -1){
2623
perror_plus("open");
2624
} else {
2625
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2626
if(ret == -1){
2627
perror_plus("fstat");
2628
} else {
2629
if(S_ISREG(st.st_mode)
2630
and st.st_uid == 0 and st.st_gid == 0){
2631
ret = fchown(pubkey_fd, uid, gid);
2632
if(ret == -1){
2633
perror_plus("fchown");
2634
}
2635
}
2636
}
2637
close(pubkey_fd);
2638
}
2639
}
2640
2641
if(dh_params_file != NULL
2642
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2643
int dhparams_fd = open(dh_params_file, O_RDONLY);
2644
if(dhparams_fd == -1){
2645
perror_plus("open");
2646
} else {
2647
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2648
if(ret == -1){
2649
perror_plus("fstat");
2650
} else {
2651
if(S_ISREG(st.st_mode)
2652
and st.st_uid == 0 and st.st_gid == 0){
2653
ret = fchown(dhparams_fd, uid, gid);
2654
if(ret == -1){
2655
perror_plus("fchown");
2656
}
2657
}
2658
}
2659
close(dhparams_fd);
2660
}
2661
}
2662
2663
/* Lower privileges */
2664
ret = lower_privileges();
2665
if(ret != 0){
2666
errno = ret;
2667
perror_plus("Failed to lower privileges");
2668
}
2669
}
2670
}
2671
2672
/* Remove invalid interface names (except "none") */
2673
{
2674
char *interface = NULL;
2675
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2676
interface))){
2677
if(strcmp(interface, "none") != 0
2678
and if_nametoindex(interface) == 0){
2679
if(interface[0] != '\0'){
2680
fprintf_plus(stderr, "Not using nonexisting interface"
2681
" \"%s\"\n", interface);
2682
}
2683
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2684
interface = NULL;
2685
}
2686
}
2687
}
2688
2689
/* Run network hooks */
2690
{
2691
if(mc.interfaces != NULL){
2692
interfaces_hooks = malloc(mc.interfaces_size);
2693
if(interfaces_hooks == NULL){
2694
perror_plus("malloc");
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
if(errno){
1006
perror("Bad port number");
1007
exitcode = EXIT_FAILURE;
2695
1008
goto end;
2696
1009
}
2697
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2698
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2699
}
2700
run_network_hooks("start", interfaces_hooks != NULL ?
2701
interfaces_hooks : "", delay);
2702
}
2703
2704
if(not debug){
2705
avahi_set_log_function(empty_log);
2706
}
2707
2708
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2709
from the signal handler */
2710
/* Initialize the pseudo-RNG for Avahi */
2711
srand((unsigned int) time(NULL));
2712
simple_poll = avahi_simple_poll_new();
2713
if(simple_poll == NULL){
2714
fprintf_plus(stderr,
2715
"Avahi: Failed to create simple poll object.\n");
2716
exitcode = EX_UNAVAILABLE;
2717
goto end;
2718
}
2719
2720
sigemptyset(&sigterm_action.sa_mask);
2721
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2722
if(ret == -1){
2723
perror_plus("sigaddset");
2724
exitcode = EX_OSERR;
2725
goto end;
2726
}
2727
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2728
if(ret == -1){
2729
perror_plus("sigaddset");
2730
exitcode = EX_OSERR;
2731
goto end;
2732
}
2733
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2734
if(ret == -1){
2735
perror_plus("sigaddset");
2736
exitcode = EX_OSERR;
2737
goto end;
2738
}
2739
/* Need to check if the handler is SIG_IGN before handling:
2740
| [[info:libc:Initial Signal Actions]] |
2741
| [[info:libc:Basic Signal Handling]] |
2742
*/
2743
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2744
if(ret == -1){
2745
perror_plus("sigaction");
2746
return EX_OSERR;
2747
}
2748
if(old_sigterm_action.sa_handler != SIG_IGN){
2749
ret = sigaction(SIGINT, &sigterm_action, NULL);
2750
if(ret == -1){
2751
perror_plus("sigaction");
2752
exitcode = EX_OSERR;
2753
goto end;
2754
}
2755
}
2756
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2757
if(ret == -1){
2758
perror_plus("sigaction");
2759
return EX_OSERR;
2760
}
2761
if(old_sigterm_action.sa_handler != SIG_IGN){
2762
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2763
if(ret == -1){
2764
perror_plus("sigaction");
2765
exitcode = EX_OSERR;
2766
goto end;
2767
}
2768
}
2769
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2770
if(ret == -1){
2771
perror_plus("sigaction");
2772
return EX_OSERR;
2773
}
2774
if(old_sigterm_action.sa_handler != SIG_IGN){
2775
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2776
if(ret == -1){
2777
perror_plus("sigaction");
2778
exitcode = EX_OSERR;
2779
goto end;
2780
}
2781
}
2782
2783
/* If no interfaces were specified, make a list */
2784
if(mc.interfaces == NULL){
2785
struct dirent **direntries = NULL;
2786
/* Look for any good interfaces */
2787
ret = scandir(sys_class_net, &direntries, good_interface,
2788
alphasort);
2789
if(ret >= 1){
2790
/* Add all found interfaces to interfaces list */
2791
for(int i = 0; i < ret; ++i){
2792
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2793
direntries[i]->d_name);
2794
if(ret_errno != 0){
2795
errno = ret_errno;
2796
perror_plus("argz_add");
2797
free(direntries[i]);
2798
continue;
2799
}
2800
if(debug){
2801
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2802
direntries[i]->d_name);
2803
}
2804
free(direntries[i]);
2805
}
2806
free(direntries);
2807
} else {
2808
if(ret == 0){
2809
free(direntries);
2810
}
2811
fprintf_plus(stderr, "Could not find a network interface\n");
2812
exitcode = EXIT_FAILURE;
2813
goto end;
2814
}
2815
}
2816
2817
/* Bring up interfaces which are down, and remove any "none"s */
2818
{
2819
char *interface = NULL;
2820
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2821
interface))){
2822
/* If interface name is "none", stop bringing up interfaces.
2823
Also remove all instances of "none" from the list */
2824
if(strcmp(interface, "none") == 0){
2825
argz_delete(&mc.interfaces, &mc.interfaces_size,
2826
interface);
2827
interface = NULL;
2828
while((interface = argz_next(mc.interfaces,
2829
mc.interfaces_size, interface))){
2830
if(strcmp(interface, "none") == 0){
2831
argz_delete(&mc.interfaces, &mc.interfaces_size,
2832
interface);
2833
interface = NULL;
2834
}
2835
}
2836
break;
2837
}
2838
bool interface_was_up = interface_is_up(interface);
2839
errno = bring_up_interface(interface, delay);
2840
if(not interface_was_up){
2841
if(errno != 0){
2842
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2843
" %s\n", interface, strerror(errno));
2844
} else {
2845
errno = argz_add(&interfaces_to_take_down,
2846
&interfaces_to_take_down_size,
2847
interface);
2848
if(errno != 0){
2849
perror_plus("argz_add");
2850
}
2851
}
2852
}
2853
}
2854
if(debug and (interfaces_to_take_down == NULL)){
2855
fprintf_plus(stderr, "No interfaces were brought up\n");
2856
}
2857
}
2858
2859
/* If we only got one interface, explicitly use only that one */
2860
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2861
if(debug){
2862
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2863
mc.interfaces);
2864
}
2865
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2866
}
2867
2868
if(quit_now){
2869
goto end;
2870
}
2871
2872
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2873
if(ret == -1){
2874
fprintf_plus(stderr, "init_gnutls_global failed\n");
2875
exitcode = EX_UNAVAILABLE;
2876
goto end;
2877
} else {
2878
gnutls_initialized = true;
2879
}
2880
2881
if(quit_now){
2882
goto end;
2883
}
2884
2885
/* Try /run/tmp before /tmp */
2886
tempdir = mkdtemp(run_tempdir);
2887
if(tempdir == NULL and errno == ENOENT){
2888
if(debug){
2889
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2890
run_tempdir, old_tempdir);
2891
}
2892
tempdir = mkdtemp(old_tempdir);
2893
}
2894
if(tempdir == NULL){
2895
perror_plus("mkdtemp");
2896
goto end;
2897
}
2898
2899
if(quit_now){
2900
goto end;
2901
}
2902
2903
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2904
fprintf_plus(stderr, "init_gpgme failed\n");
2905
exitcode = EX_UNAVAILABLE;
2906
goto end;
2907
} else {
2908
gpgme_initialized = true;
2909
}
2910
2911
if(quit_now){
2912
goto end;
2913
}
2914
2915
if(connect_to != NULL){
2916
/* Connect directly, do not use Zeroconf */
2917
/* (Mainly meant for debugging) */
2918
char *address = strrchr(connect_to, ':');
2919
2920
if(address == NULL){
2921
fprintf_plus(stderr, "No colon in address\n");
2922
exitcode = EX_USAGE;
2923
goto end;
2924
}
2925
2926
if(quit_now){
2927
goto end;
2928
}
2929
2930
in_port_t port;
2931
errno = 0;
2932
tmpmax = strtoimax(address+1, &tmp, 10);
2933
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2934
or tmpmax != (in_port_t)tmpmax){
2935
fprintf_plus(stderr, "Bad port number\n");
2936
exitcode = EX_USAGE;
2937
goto end;
2938
}
2939
2940
if(quit_now){
2941
goto end;
2942
}
2943
2944
port = (in_port_t)tmpmax;
2945
*address = '\0';
2946
/* Colon in address indicates IPv6 */
2947
int af;
2948
if(strchr(connect_to, ':') != NULL){
2949
af = AF_INET6;
2950
/* Accept [] around IPv6 address - see RFC 5952 */
2951
if(connect_to[0] == '[' and address[-1] == ']')
2952
{
2953
connect_to++;
2954
address[-1] = '\0';
2955
}
2956
} else {
2957
af = AF_INET;
2958
}
2959
address = connect_to;
2960
2961
if(quit_now){
2962
goto end;
2963
}
2964
2965
while(not quit_now){
2966
ret = start_mandos_communication(address, port, if_index, af,
2967
&mc);
2968
if(quit_now or ret == 0){
2969
break;
2970
}
2971
if(debug){
2972
fprintf_plus(stderr, "Retrying in %d seconds\n",
2973
(int)retry_interval);
2974
}
2975
sleep((unsigned int)retry_interval);
2976
}
2977
2978
if(not quit_now){
2979
exitcode = EXIT_SUCCESS;
2980
}
2981
2982
goto end;
2983
}
2984
2985
if(quit_now){
2986
goto end;
2987
}
2988
2989
{
2990
AvahiServerConfig config;
2991
/* Do not publish any local Zeroconf records */
2992
avahi_server_config_init(&config);
2993
config.publish_hinfo = 0;
2994
config.publish_addresses = 0;
2995
config.publish_workstation = 0;
2996
config.publish_domain = 0;
2997
2998
/* Allocate a new server */
2999
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3000
&config, NULL, NULL, &ret);
3001
3002
/* Free the Avahi configuration data */
3003
avahi_server_config_free(&config);
3004
}
3005
3006
/* Check if creating the Avahi server object succeeded */
3007
if(mc.server == NULL){
3008
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3009
avahi_strerror(ret));
3010
exitcode = EX_UNAVAILABLE;
3011
goto end;
3012
}
3013
3014
if(quit_now){
3015
goto end;
3016
}
3017
3018
/* Create the Avahi service browser */
3019
sb = avahi_s_service_browser_new(mc.server, if_index,
3020
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3021
NULL, 0, browse_callback,
3022
(void *)&mc);
3023
if(sb == NULL){
3024
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3025
avahi_strerror(avahi_server_errno(mc.server)));
3026
exitcode = EX_UNAVAILABLE;
3027
goto end;
3028
}
3029
3030
if(quit_now){
3031
goto end;
3032
}
3033
3034
/* Run the main loop */
3035
3036
if(debug){
3037
fprintf_plus(stderr, "Starting Avahi loop search\n");
3038
}
3039
3040
ret = avahi_loop_with_timeout(simple_poll,
3041
(int)(retry_interval * 1000), &mc);
3042
if(debug){
3043
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3044
(ret == 0) ? "successfully" : "with error");
3045
}
3046
1010
*address = '\0';
1011
address = connect_to;
1012
ret = start_mandos_communication(address, port, if_index, &mc);
1013
if(ret < 0){
1014
exitcode = EXIT_FAILURE;
1015
} else {
1016
exitcode = EXIT_SUCCESS;
1017
}
1018
goto end;
1019
}
1020
1021
if (not debug){
1022
avahi_set_log_function(empty_log);
1023
}
1024
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
1028
/* Allocate main Avahi loop object */
1029
mc.simple_poll = avahi_simple_poll_new();
1030
if (mc.simple_poll == NULL) {
1031
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
" object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
{
1038
AvahiServerConfig config;
1039
/* Do not publish any local Zeroconf records */
1040
avahi_server_config_init(&config);
1041
config.publish_hinfo = 0;
1042
config.publish_addresses = 0;
1043
config.publish_workstation = 0;
1044
config.publish_domain = 0;
1045
1046
/* Allocate a new server */
1047
mc.server = avahi_server_new(avahi_simple_poll_get
1048
(mc.simple_poll), &config, NULL,
1049
NULL, &error);
1050
1051
/* Free the Avahi configuration data */
1052
avahi_server_config_free(&config);
1053
}
1054
1055
/* Check if creating the Avahi server object succeeded */
1056
if (mc.server == NULL) {
1057
fprintf(stderr, "Failed to create Avahi server: %s\n",
1058
avahi_strerror(error));
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* Create the Avahi service browser */
1064
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
AVAHI_PROTO_INET6,
1066
"_mandos._tcp", NULL, 0,
1067
browse_callback, &mc);
1068
if (sb == NULL) {
1069
fprintf(stderr, "Failed to create service browser: %s\n",
1070
avahi_strerror(avahi_server_errno(mc.server)));
1071
exitcode = EXIT_FAILURE;
1072
goto end;
1073
}
1074
1075
/* Run the main loop */
1076
1077
if (debug){
1078
fprintf(stderr, "Starting Avahi loop search\n");
1079
}
1080
1081
avahi_simple_poll_loop(mc.simple_poll);
1082
3047
1083
end:
3048
3049
if(debug){
3050
if(signal_received){
3051
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3052
argv[0], signal_received,
3053
strsignal(signal_received));
3054
} else {
3055
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3056
}
3057
}
3058
3059
/* Cleanup things */
3060
free(mc.interfaces);
3061
3062
if(sb != NULL)
3063
avahi_s_service_browser_free(sb);
3064
3065
if(mc.server != NULL)
3066
avahi_server_free(mc.server);
3067
3068
if(simple_poll != NULL)
3069
avahi_simple_poll_free(simple_poll);
3070
3071
if(gnutls_initialized){
3072
gnutls_certificate_free_credentials(mc.cred);
3073
gnutls_dh_params_deinit(mc.dh_params);
3074
}
3075
3076
if(gpgme_initialized){
3077
gpgme_release(mc.ctx);
3078
}
3079
3080
/* Cleans up the circular linked list of Mandos servers the client
3081
has seen */
3082
if(mc.current_server != NULL){
3083
mc.current_server->prev->next = NULL;
3084
while(mc.current_server != NULL){
3085
server *next = mc.current_server->next;
3086
#ifdef __GNUC__
3087
#pragma GCC diagnostic push
3088
#pragma GCC diagnostic ignored "-Wcast-qual"
3089
#endif
3090
free((char *)(mc.current_server->ip));
3091
#ifdef __GNUC__
3092
#pragma GCC diagnostic pop
3093
#endif
3094
free(mc.current_server);
3095
mc.current_server = next;
3096
}
3097
}
3098
3099
/* Re-raise privileges */
3100
{
3101
ret = raise_privileges();
3102
if(ret != 0){
3103
errno = ret;
3104
perror_plus("Failed to raise privileges");
3105
} else {
3106
3107
/* Run network hooks */
3108
run_network_hooks("stop", interfaces_hooks != NULL ?
3109
interfaces_hooks : "", delay);
3110
3111
/* Take down the network interfaces which were brought up */
3112
{
3113
char *interface = NULL;
3114
while((interface = argz_next(interfaces_to_take_down,
3115
interfaces_to_take_down_size,
3116
interface))){
3117
ret = take_down_interface(interface);
3118
if(ret != 0){
3119
errno = ret;
3120
perror_plus("Failed to take down interface");
3121
}
3122
}
3123
if(debug and (interfaces_to_take_down == NULL)){
3124
fprintf_plus(stderr, "No interfaces needed to be taken"
3125
" down\n");
3126
}
3127
}
3128
}
3129
3130
ret = lower_privileges_permanently();
3131
if(ret != 0){
3132
errno = ret;
3133
perror_plus("Failed to lower privileges permanently");
3134
}
3135
}
3136
3137
free(interfaces_to_take_down);
3138
free(interfaces_hooks);
3139
3140
void clean_dir_at(int base, const char * const dirname,
3141
uintmax_t level){
3142
struct dirent **direntries = NULL;
3143
int dret;
3144
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3145
O_RDONLY
3146
| O_NOFOLLOW
3147
| O_DIRECTORY
3148
| O_PATH));
3149
if(dir_fd == -1){
3150
perror_plus("open");
3151
return;
3152
}
3153
int numentries = scandirat(dir_fd, ".", &direntries,
3154
notdotentries, alphasort);
3155
if(numentries >= 0){
3156
for(int i = 0; i < numentries; i++){
3157
if(debug){
3158
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3159
dirname, direntries[i]->d_name);
3160
}
3161
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3162
if(dret == -1){
3163
if(errno == EISDIR){
3164
dret = unlinkat(dir_fd, direntries[i]->d_name,
3165
AT_REMOVEDIR);
3166
}
3167
if((dret == -1) and (errno == ENOTEMPTY)
3168
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3169
== 0) and (level == 0)){
3170
/* Recurse only in this special case */
3171
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3172
dret = 0;
3173
}
3174
if((dret == -1) and (errno != ENOENT)){
3175
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3176
direntries[i]->d_name, strerror(errno));
3177
}
3178
}
3179
free(direntries[i]);
3180
}
3181
3182
/* need to clean even if 0 because man page doesn't specify */
3183
free(direntries);
3184
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3185
if(dret == -1 and errno != ENOENT){
3186
perror_plus("rmdir");
3187
}
3188
} else {
3189
perror_plus("scandirat");
3190
}
3191
close(dir_fd);
3192
}
3193
3194
/* Removes the GPGME temp directory and all files inside */
3195
if(tempdir != NULL){
3196
clean_dir_at(-1, tempdir, 0);
3197
}
3198
3199
if(quit_now){
3200
sigemptyset(&old_sigterm_action.sa_mask);
3201
old_sigterm_action.sa_handler = SIG_DFL;
3202
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3203
&old_sigterm_action,
3204
NULL));
3205
if(ret == -1){
3206
perror_plus("sigaction");
3207
}
3208
do {
3209
ret = raise(signal_received);
3210
} while(ret != 0 and errno == EINTR);
3211
if(ret != 0){
3212
perror_plus("raise");
3213
abort();
3214
}
3215
TEMP_FAILURE_RETRY(pause());
3216
}
3217
3218
return exitcode;
1084
1085
if (debug){
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1087
}
1088
1089
/* Cleanup things */
1090
if (sb != NULL)
1091
avahi_s_service_browser_free(sb);
1092
1093
if (mc.server != NULL)
1094
avahi_server_free(mc.server);
1095
1096
if (mc.simple_poll != NULL)
1097
avahi_simple_poll_free(mc.simple_poll);
1098
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1103
}
1104
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1107
}
1108
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1111
DIR *d;
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1114
if(d == NULL){
1115
perror("opendir");
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1){
1142
perror("rmdir");
1143
}
1144
}
1145
1146
return exitcode;
3219
1147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0