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- Committer: Teddy Hogeborn
- Date: 2018-02-22 14:34:19 UTC
- Revision ID: teddy@recompile.se-20180222143419-4uh4vcpgc9hv2fzx
Check return values from newly added close() calls
* plugins.d/mandos-client.c (init_gnutls_global): Check return
values from newly added close() calls.
* plugins.d/mandos-client.c (init_gnutls_global): Check return
values from newly added close() calls.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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
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
20
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
21
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22
25
* General Public License for more details.
23
26
*
24
27
* You should have received a copy of the GNU General Public License
25
* along with this program. If not, see
26
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
27
29
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
* Contact the authors at <mandos@recompile.se>.
29
31
*/
30
32
31
33
/* Needed by GPGME, specifically gpgme_data_seek() */
34
#ifndef _LARGEFILE_SOURCE
32
35
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
37
#ifndef _FILE_OFFSET_BITS
33
38
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
34
40
35
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
42
37
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
44
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
40
46
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
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 */
47
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
55
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
56
SOCK_STREAM, uid_t, gid_t, open(),
57
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
52
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
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() */
61
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
75
SIOCSIFFLAGS, if_indextoname(),
63
76
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
77
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
78
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
79
*/
65
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
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 */
70
86
#include <argp.h> /* struct argp_option, error_t, struct
71
87
argp_state, struct argp,
72
88
argp_parse(), ARGP_KEY_ARG,
73
89
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__ */
74
108
75
109
/* Avahi */
76
110
/* All Avahi types, constants and functions
89
123
gnutls_*
90
124
init_gnutls_session(),
91
125
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
126
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
94
129
95
130
/* GPGME */
96
131
#include <gpgme.h> /* All GPGME types, constants and
101
136
102
137
#define BUFFER_SIZE 256
103
138
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
139
#define PATHDIR "/conf/conf.d/mandos"
109
140
#define SECKEY "seckey.txt"
110
141
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
111
143
112
144
bool debug = false;
113
145
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "password-request 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
116
165
117
166
/* Used for passing in values through the Avahi callback functions */
118
167
typedef struct {
119
AvahiSimplePoll *simple_poll;
120
168
AvahiServer *server;
121
169
gnutls_certificate_credentials_t cred;
122
170
unsigned int dh_bits;
123
171
gnutls_dh_params_t dh_params;
124
172
const char *priority;
125
173
gpgme_ctx_t ctx;
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
126
177
} mandos_context;
127
178
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
128
204
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
* bytes. "buffer_capacity" is how much is currently allocated,
131
207
* "buffer_length" is how much is already used.
132
208
*/
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){
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;
138
219
return 0;
139
220
}
221
*buffer = new_buf;
140
222
buffer_capacity += BUFFER_SIZE;
141
223
}
142
224
return buffer_capacity;
143
225
}
144
226
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
145
275
/*
146
276
* Initialize GPGME.
147
277
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
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){
151
283
gpgme_error_t rc;
152
284
gpgme_engine_info_t engine_info;
153
285
154
155
286
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
287
* Helper function to insert pub and seckey to the engine keyring.
157
288
*/
158
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
290
int ret;
159
291
int fd;
160
292
gpgme_data_t pgp_data;
161
293
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
295
if(fd == -1){
164
perror("open");
296
perror_plus("open");
165
297
return false;
166
298
}
167
299
168
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
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));
172
304
return false;
173
305
}
174
306
175
307
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
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));
179
311
return false;
180
312
}
181
313
182
ret = TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
183
315
if(ret == -1){
184
perror("close");
316
perror_plus("close");
185
317
}
186
318
gpgme_data_release(pgp_data);
187
319
return true;
188
320
}
189
321
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
322
if(debug){
323
fprintf_plus(stderr, "Initializing GPGME\n");
192
324
}
193
325
194
326
/* Init GPGME */
195
327
gpgme_check_version(NULL);
196
328
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
329
if(rc != GPG_ERR_NO_ERROR){
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
200
332
return false;
201
333
}
202
334
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));
335
/* Set GPGME home directory for the OpenPGP engine only */
336
rc = gpgme_get_engine_info(&engine_info);
337
if(rc != GPG_ERR_NO_ERROR){
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
208
340
return false;
209
341
}
210
342
while(engine_info != NULL){
216
348
engine_info = engine_info->next;
217
349
}
218
350
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
220
353
return false;
221
354
}
222
355
223
356
/* Create new GPGME "context" */
224
357
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
358
if(rc != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
362
return false;
363
}
364
365
if(not import_key(pubkey) or not import_key(seckey)){
366
return false;
367
}
368
369
return true;
236
370
}
237
371
238
372
/*
239
373
* Decrypt OpenPGP data.
240
374
* Returns -1 on error
241
375
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
376
__attribute__((nonnull, warn_unused_result))
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
246
381
gpgme_data_t dh_crypto, dh_plain;
247
382
gpgme_error_t rc;
248
383
ssize_t ret;
249
384
size_t plaintext_capacity = 0;
250
385
ssize_t plaintext_length = 0;
251
386
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
387
if(debug){
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
254
389
}
255
390
256
391
/* Create new GPGME data buffer from memory cryptotext */
257
392
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
393
0);
259
if (rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
394
if(rc != GPG_ERR_NO_ERROR){
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
262
397
return -1;
263
398
}
264
399
265
400
/* Create new empty GPGME data buffer for the plaintext */
266
401
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
402
if(rc != GPG_ERR_NO_ERROR){
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
270
406
gpgme_data_release(dh_crypto);
271
407
return -1;
272
408
}
274
410
/* Decrypt data from the cryptotext data buffer to the plaintext
275
411
data buffer */
276
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
413
if(rc != GPG_ERR_NO_ERROR){
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
280
416
plaintext_length = -1;
281
if (debug){
417
if(debug){
282
418
gpgme_decrypt_result_t result;
283
419
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
420
if(result == NULL){
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
286
422
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
423
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
424
result->unsupported_algorithm);
425
fprintf_plus(stderr, "Wrong key usage: %u\n",
426
result->wrong_key_usage);
291
427
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
293
429
}
294
430
gpgme_recipient_t recipient;
295
431
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
}
432
while(recipient != NULL){
433
fprintf_plus(stderr, "Public key algorithm: %s\n",
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
436
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
437
fprintf_plus(stderr, "Secret key available: %s\n",
438
recipient->status == GPG_ERR_NO_SECKEY
439
? "No" : "Yes");
440
recipient = recipient->next;
306
441
}
307
442
}
308
443
}
310
445
}
311
446
312
447
if(debug){
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
448
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
314
449
}
315
450
316
451
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("pgpme_data_seek");
452
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
453
perror_plus("gpgme_data_seek");
319
454
plaintext_length = -1;
320
455
goto decrypt_end;
321
456
}
322
457
323
458
*plaintext = NULL;
324
459
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
460
plaintext_capacity = incbuffer(plaintext,
461
(size_t)plaintext_length,
462
plaintext_capacity);
463
if(plaintext_capacity == 0){
464
perror_plus("incbuffer");
465
plaintext_length = -1;
466
goto decrypt_end;
332
467
}
333
468
334
469
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
470
BUFFER_SIZE);
336
471
/* Print the data, if any */
337
if (ret == 0){
472
if(ret == 0){
338
473
/* EOF */
339
474
break;
340
475
}
341
476
if(ret < 0){
342
perror("gpgme_data_read");
477
perror_plus("gpgme_data_read");
343
478
plaintext_length = -1;
344
479
goto decrypt_end;
345
480
}
347
482
}
348
483
349
484
if(debug){
350
fprintf(stderr, "Decrypted password is: ");
485
fprintf_plus(stderr, "Decrypted password is: ");
351
486
for(ssize_t i = 0; i < plaintext_length; i++){
352
487
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
353
488
}
364
499
return plaintext_length;
365
500
}
366
501
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;
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
372
513
}
373
514
374
515
/* GnuTLS log function callback */
516
__attribute__((nonnull))
375
517
static void debuggnutls(__attribute__((unused)) int level,
376
518
const char* string){
377
fprintf(stderr, "GnuTLS: %s", string);
519
fprintf_plus(stderr, "GnuTLS: %s", string);
378
520
}
379
521
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
static int init_gnutls_global(const char *pubkeyfilename,
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
383
527
int ret;
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){
528
unsigned int uret;
529
530
if(debug){
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
}
533
534
if(debug){
397
535
/* "Use a log level over 10 to enable all debugging options."
398
536
* - GnuTLS manual
399
537
*/
402
540
}
403
541
404
542
/* OpenPGP credentials */
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
411
547
return -1;
412
548
}
413
549
414
550
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
553
pubkeyfilename,
554
seckeyfilename);
418
555
}
419
556
420
557
ret = gnutls_certificate_set_openpgp_key_file
421
558
(mc->cred, pubkeyfilename, seckeyfilename,
422
559
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
424
fprintf(stderr,
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
428
safer_gnutls_strerror(ret));
560
if(ret != GNUTLS_E_SUCCESS){
561
fprintf_plus(stderr,
562
"Error[%d] while reading the OpenPGP key pair ('%s',"
563
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
565
safer_gnutls_strerror(ret));
429
566
goto globalfail;
430
567
}
431
568
432
569
/* GnuTLS server initialization */
433
570
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
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
571
if(ret != GNUTLS_E_SUCCESS){
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
" initialization: %s\n",
574
safer_gnutls_strerror(ret));
575
goto globalfail;
576
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
446
754
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
447
755
448
756
return 0;
450
758
globalfail:
451
759
452
760
gnutls_certificate_free_credentials(mc->cred);
453
gnutls_global_deinit();
761
gnutls_dh_params_deinit(mc->dh_params);
454
762
return -1;
455
763
}
456
764
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
765
__attribute__((nonnull, warn_unused_result))
766
static int init_gnutls_session(gnutls_session_t *session,
767
mandos_context *mc){
459
768
int ret;
460
769
/* GnuTLS session creation */
461
ret = gnutls_init(session, GNUTLS_SERVER);
462
if (ret != GNUTLS_E_SUCCESS){
463
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
464
safer_gnutls_strerror(ret));
770
do {
771
ret = gnutls_init(session, GNUTLS_SERVER);
772
if(quit_now){
773
return -1;
774
}
775
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
776
if(ret != GNUTLS_E_SUCCESS){
777
fprintf_plus(stderr,
778
"Error in GnuTLS session initialization: %s\n",
779
safer_gnutls_strerror(ret));
465
780
}
466
781
467
782
{
468
783
const char *err;
469
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
470
if (ret != GNUTLS_E_SUCCESS) {
471
fprintf(stderr, "Syntax error at: %s\n", err);
472
fprintf(stderr, "GnuTLS error: %s\n",
473
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
784
do {
785
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
786
if(quit_now){
787
gnutls_deinit(*session);
788
return -1;
789
}
790
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
791
if(ret != GNUTLS_E_SUCCESS){
792
fprintf_plus(stderr, "Syntax error at: %s\n", err);
793
fprintf_plus(stderr, "GnuTLS error: %s\n",
794
safer_gnutls_strerror(ret));
795
gnutls_deinit(*session);
475
796
return -1;
476
797
}
477
798
}
478
799
479
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
480
mc->cred);
481
if (ret != GNUTLS_E_SUCCESS) {
482
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
800
do {
801
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
802
mc->cred);
803
if(quit_now){
804
gnutls_deinit(*session);
805
return -1;
806
}
807
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
808
if(ret != GNUTLS_E_SUCCESS){
809
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
810
safer_gnutls_strerror(ret));
811
gnutls_deinit(*session);
485
812
return -1;
486
813
}
487
814
488
815
/* ignore client certificate if any. */
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
491
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
816
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
493
817
494
818
return 0;
495
819
}
498
822
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
499
823
__attribute__((unused)) const char *txt){}
500
824
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
880
const char *address,
881
AvahiIfIndex if_index){
882
int ret;
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
889
if(debug){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
892
}
893
return false;
894
}
895
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
return false;
900
}
901
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
903
if(devnull == -1){
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
return false;
906
}
907
pid_t pid = fork();
908
if(pid == 0){
909
/* Child */
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
912
if(errno != 0){
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
915
} else {
916
/* Set group */
917
errno = 0;
918
ret = setgid(0);
919
if(ret == -1){
920
perror_plus("setgid");
921
_exit(EX_NOPERM);
922
}
923
/* Reset supplementary groups */
924
errno = 0;
925
ret = setgroups(0, NULL);
926
if(ret == -1){
927
perror_plus("setgroups");
928
_exit(EX_NOPERM);
929
}
930
}
931
ret = dup2(devnull, STDIN_FILENO);
932
if(ret == -1){
933
perror_plus("dup2(devnull, STDIN_FILENO)");
934
_exit(EX_OSERR);
935
}
936
ret = close(devnull);
937
if(ret == -1){
938
perror_plus("close");
939
_exit(EX_OSERR);
940
}
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
942
if(ret == -1){
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
_exit(EX_OSERR);
945
}
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
O_RDONLY
948
| O_DIRECTORY
949
| O_PATH
950
| O_CLOEXEC));
951
if(helperdir_fd == -1){
952
perror_plus("open");
953
_exit(EX_UNAVAILABLE);
954
}
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
helper, O_RDONLY));
957
if(helper_fd == -1){
958
perror_plus("openat");
959
close(helperdir_fd);
960
_exit(EX_UNAVAILABLE);
961
}
962
close(helperdir_fd);
963
#ifdef __GNUC__
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
966
#endif
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
971
#ifdef __GNUC__
972
#pragma GCC diagnostic pop
973
#endif
974
perror_plus("fexecve");
975
_exit(EXIT_FAILURE);
976
}
977
}
978
if(pid == -1){
979
perror_plus("fork");
980
return false;
981
}
982
int status;
983
pid_t pret = -1;
984
errno = 0;
985
do {
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
993
}
994
if(kill(pid, SIGTERM) == -1){
995
perror_plus("kill");
996
}
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
999
" helper program");
1000
}
1001
return false;
1002
}
1003
} while(pret == -1 and errno == EINTR);
1004
if(pret == -1){
1005
perror_plus("waitpid");
1006
return false;
1007
}
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1012
return false;
1013
}
1014
return true;
1015
}
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1019
return false;
1020
}
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
return false;
1023
}
1024
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
1032
}
1033
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
1041
}
1042
501
1043
/* Called when a Mandos server is found */
502
static int start_mandos_communication(const char *ip, uint16_t port,
1044
__attribute__((nonnull, warn_unused_result))
1045
static int start_mandos_communication(const char *ip, in_port_t port,
503
1046
AvahiIfIndex if_index,
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1047
int af, mandos_context *mc){
1048
int ret, tcp_sd = -1;
1049
ssize_t sret;
1050
struct sockaddr_storage to;
507
1051
char *buffer = NULL;
508
char *decrypted_buffer;
1052
char *decrypted_buffer = NULL;
509
1053
size_t buffer_length = 0;
510
1054
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
512
1055
size_t written;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
1056
int retval = -1;
515
1057
gnutls_session_t session;
516
517
ret = init_gnutls_session (mc, &session);
518
if (ret != 0){
519
return -1;
520
}
521
522
if(debug){
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
524
"\n", ip, port);
525
}
526
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
528
if(tcp_sd < 0) {
529
perror("socket");
530
return -1;
531
}
532
533
if(debug){
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
perror("if_indextoname");
1058
int pf; /* Protocol family */
1059
bool route_added = false;
1060
1061
errno = 0;
1062
1063
if(quit_now){
1064
errno = EINTR;
1065
return -1;
1066
}
1067
1068
switch(af){
1069
case AF_INET6:
1070
pf = PF_INET6;
1071
break;
1072
case AF_INET:
1073
pf = PF_INET;
1074
break;
1075
default:
1076
fprintf_plus(stderr, "Bad address family: %d\n", af);
1077
errno = EINVAL;
1078
return -1;
1079
}
1080
1081
/* If the interface is specified and we have a list of interfaces */
1082
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1083
/* Check if the interface is one of the interfaces we are using */
1084
bool match = false;
1085
{
1086
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
1090
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
match = true;
1092
break;
1093
}
1094
}
1095
}
1096
if(not match){
1097
/* This interface does not match any in the list, so we don't
1098
connect to the server */
1099
if(debug){
1100
char interface[IF_NAMESIZE];
1101
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1102
perror_plus("if_indextoname");
1103
} else {
1104
fprintf_plus(stderr, "Skipping server on non-used interface"
1105
" \"%s\"\n",
1106
if_indextoname((unsigned int)if_index,
1107
interface));
1108
}
1109
}
536
1110
return -1;
537
1111
}
538
fprintf(stderr, "Binding to interface %s\n", interface);
539
1112
}
540
1113
541
memset(&to, 0, sizeof(to));
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
546
if (ret < 0 ){
547
perror("inet_pton");
1114
ret = init_gnutls_session(&session, mc);
1115
if(ret != 0){
548
1116
return -1;
549
1117
}
1118
1119
if(debug){
1120
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1121
PRIuMAX "\n", ip, (uintmax_t)port);
1122
}
1123
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1125
if(tcp_sd < 0){
1126
int e = errno;
1127
perror_plus("socket");
1128
errno = e;
1129
goto mandos_end;
1130
}
1131
1132
if(quit_now){
1133
errno = EINTR;
1134
goto mandos_end;
1135
}
1136
1137
if(af == AF_INET6){
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to6->sin6_addr);
1141
} else { /* IPv4 */
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
ret = inet_pton(af, ip, &to4->sin_addr);
1145
}
1146
if(ret < 0 ){
1147
int e = errno;
1148
perror_plus("inet_pton");
1149
errno = e;
1150
goto mandos_end;
1151
}
550
1152
if(ret == 0){
551
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
1153
int e = errno;
1154
fprintf_plus(stderr, "Bad address: %s\n", ip);
1155
errno = e;
1156
goto mandos_end;
1157
}
1158
if(af == AF_INET6){
1159
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1160
if(IN6_IS_ADDR_LINKLOCAL
1161
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1162
if(if_index == AVAHI_IF_UNSPEC){
1163
fprintf_plus(stderr, "An IPv6 link-local address is"
1164
" incomplete without a network interface\n");
1165
errno = EINVAL;
1166
goto mandos_end;
1167
}
1168
/* Set the network interface number as scope */
1169
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1170
}
1171
} else {
1172
((struct sockaddr_in *)&to)->sin_port = htons(port);
1173
}
555
1174
556
to.in6.sin6_scope_id = (uint32_t)if_index;
1175
if(quit_now){
1176
errno = EINTR;
1177
goto mandos_end;
1178
}
557
1179
558
1180
if(debug){
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
561
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
563
sizeof(addrstr)) == NULL){
564
perror("inet_ntop");
565
} else {
566
if(strcmp(addrstr, ip) != 0){
567
fprintf(stderr, "Canonical address form: %s\n", addrstr);
568
}
569
}
570
}
571
572
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
574
perror("connect");
575
return -1;
1181
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1182
char interface[IF_NAMESIZE];
1183
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1184
perror_plus("if_indextoname");
1185
} else {
1186
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1187
"\n", ip, interface, (uintmax_t)port);
1188
}
1189
} else {
1190
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1191
ip, (uintmax_t)port);
1192
}
1193
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1194
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1195
if(af == AF_INET6){
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in6),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
} else {
1201
ret = getnameinfo((struct sockaddr *)&to,
1202
sizeof(struct sockaddr_in),
1203
addrstr, sizeof(addrstr), NULL, 0,
1204
NI_NUMERICHOST);
1205
}
1206
if(ret == EAI_SYSTEM){
1207
perror_plus("getnameinfo");
1208
} else if(ret != 0) {
1209
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1210
} else if(strcmp(addrstr, ip) != 0){
1211
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1212
}
1213
}
1214
1215
if(quit_now){
1216
errno = EINTR;
1217
goto mandos_end;
1218
}
1219
1220
while(true){
1221
if(af == AF_INET6){
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1224
} else {
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1227
}
1228
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1235
&to)->sin6_addr)))
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1246
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1250
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
int e = errno;
1256
route_added = add_local_route(ip, if_index);
1257
if(route_added){
1258
continue;
1259
}
1260
errno = e;
1261
}
1262
if(errno != ECONNREFUSED or debug){
1263
int e = errno;
1264
perror_plus("connect");
1265
errno = e;
1266
}
1267
goto mandos_end;
1268
}
1269
1270
if(quit_now){
1271
errno = EINTR;
1272
goto mandos_end;
1273
}
1274
break;
576
1275
}
577
1276
578
1277
const char *out = mandos_protocol_version;
579
1278
written = 0;
580
while (true){
1279
while(true){
581
1280
size_t out_size = strlen(out);
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
out_size - written));
584
if (ret == -1){
585
perror("write");
586
retval = -1;
1281
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1282
out_size - written));
1283
if(ret == -1){
1284
int e = errno;
1285
perror_plus("write");
1286
errno = e;
587
1287
goto mandos_end;
588
1288
}
589
1289
written += (size_t)ret;
590
1290
if(written < out_size){
591
1291
continue;
592
1292
} else {
593
if (out == mandos_protocol_version){
1293
if(out == mandos_protocol_version){
594
1294
written = 0;
595
1295
out = "\r\n";
596
1296
} else {
597
1297
break;
598
1298
}
599
1299
}
1300
1301
if(quit_now){
1302
errno = EINTR;
1303
goto mandos_end;
1304
}
600
1305
}
601
1306
602
1307
if(debug){
603
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
}
605
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
608
do{
609
ret = gnutls_handshake (session);
1308
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1309
}
1310
1311
if(quit_now){
1312
errno = EINTR;
1313
goto mandos_end;
1314
}
1315
1316
/* This casting via intptr_t is to eliminate warning about casting
1317
an int to a pointer type. This is exactly how the GnuTLS Guile
1318
function "set-session-transport-fd!" does it. */
1319
gnutls_transport_set_ptr(session,
1320
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1321
1322
if(quit_now){
1323
errno = EINTR;
1324
goto mandos_end;
1325
}
1326
1327
do {
1328
ret = gnutls_handshake(session);
1329
if(quit_now){
1330
errno = EINTR;
1331
goto mandos_end;
1332
}
610
1333
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
611
1334
612
if (ret != GNUTLS_E_SUCCESS){
1335
if(ret != GNUTLS_E_SUCCESS){
613
1336
if(debug){
614
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
1337
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
1338
gnutls_perror(ret);
616
1339
}
617
retval = -1;
1340
errno = EPROTO;
618
1341
goto mandos_end;
619
1342
}
620
1343
621
1344
/* Read OpenPGP packet that contains the wanted password */
622
1345
623
1346
if(debug){
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
ip);
1347
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1348
" %s\n", ip);
626
1349
}
627
1350
628
1351
while(true){
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
buffer_capacity);
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
633
retval = -1;
634
goto mandos_end;
635
}
636
637
ret = gnutls_record_recv(session, buffer+buffer_length,
638
BUFFER_SIZE);
639
if (ret == 0){
1352
1353
if(quit_now){
1354
errno = EINTR;
1355
goto mandos_end;
1356
}
1357
1358
buffer_capacity = incbuffer(&buffer, buffer_length,
1359
buffer_capacity);
1360
if(buffer_capacity == 0){
1361
int e = errno;
1362
perror_plus("incbuffer");
1363
errno = e;
1364
goto mandos_end;
1365
}
1366
1367
if(quit_now){
1368
errno = EINTR;
1369
goto mandos_end;
1370
}
1371
1372
sret = gnutls_record_recv(session, buffer+buffer_length,
1373
BUFFER_SIZE);
1374
if(sret == 0){
640
1375
break;
641
1376
}
642
if (ret < 0){
643
switch(ret){
1377
if(sret < 0){
1378
switch(sret){
644
1379
case GNUTLS_E_INTERRUPTED:
645
1380
case GNUTLS_E_AGAIN:
646
1381
break;
647
1382
case GNUTLS_E_REHANDSHAKE:
648
do{
649
ret = gnutls_handshake (session);
1383
do {
1384
ret = gnutls_handshake(session);
1385
1386
if(quit_now){
1387
errno = EINTR;
1388
goto mandos_end;
1389
}
650
1390
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
651
if (ret < 0){
652
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
654
retval = -1;
1391
if(ret < 0){
1392
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1393
"***\n");
1394
gnutls_perror(ret);
1395
errno = EPROTO;
655
1396
goto mandos_end;
656
1397
}
657
1398
break;
658
1399
default:
659
fprintf(stderr, "Unknown error while reading data from"
660
" encrypted session with Mandos server\n");
661
retval = -1;
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1400
fprintf_plus(stderr, "Unknown error while reading data from"
1401
" encrypted session with Mandos server\n");
1402
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1403
errno = EIO;
663
1404
goto mandos_end;
664
1405
}
665
1406
} else {
666
buffer_length += (size_t) ret;
1407
buffer_length += (size_t) sret;
667
1408
}
668
1409
}
669
1410
670
1411
if(debug){
671
fprintf(stderr, "Closing TLS session\n");
672
}
673
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
676
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
678
buffer_length,
679
&decrypted_buffer);
680
if (decrypted_buffer_size >= 0){
1412
fprintf_plus(stderr, "Closing TLS session\n");
1413
}
1414
1415
if(quit_now){
1416
errno = EINTR;
1417
goto mandos_end;
1418
}
1419
1420
do {
1421
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1422
if(quit_now){
1423
errno = EINTR;
1424
goto mandos_end;
1425
}
1426
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1427
1428
if(buffer_length > 0){
1429
ssize_t decrypted_buffer_size;
1430
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1431
&decrypted_buffer, mc);
1432
if(decrypted_buffer_size >= 0){
1433
1434
clearerr(stdout);
681
1435
written = 0;
682
1436
while(written < (size_t) decrypted_buffer_size){
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
1437
if(quit_now){
1438
errno = EINTR;
1439
goto mandos_end;
1440
}
1441
1442
ret = (int)fwrite(decrypted_buffer + written, 1,
1443
(size_t)decrypted_buffer_size - written,
1444
stdout);
686
1445
if(ret == 0 and ferror(stdout)){
1446
int e = errno;
687
1447
if(debug){
688
fprintf(stderr, "Error writing encrypted data: %s\n",
689
strerror(errno));
1448
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1449
strerror(errno));
690
1450
}
691
retval = -1;
692
break;
1451
errno = e;
1452
goto mandos_end;
693
1453
}
694
1454
written += (size_t)ret;
695
1455
}
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
1466
retval = 0;
699
1467
}
700
} else {
701
retval = -1;
702
1468
}
703
1469
704
1470
/* Shutdown procedure */
705
1471
706
1472
mandos_end:
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
1473
{
1474
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
fprintf_plus(stderr, "Failed to delete local route to %s on"
1477
" interface %d", ip, if_index);
1478
}
1479
}
1480
int e = errno;
1481
free(decrypted_buffer);
1482
free(buffer);
1483
if(tcp_sd >= 0){
1484
ret = close(tcp_sd);
1485
}
1486
if(ret == -1){
1487
if(e == 0){
1488
e = errno;
1489
}
1490
perror_plus("close");
1491
}
1492
gnutls_deinit(session);
1493
errno = e;
1494
if(quit_now){
1495
errno = EINTR;
1496
retval = -1;
1497
}
711
1498
}
712
gnutls_deinit (session);
713
1499
return retval;
714
1500
}
715
1501
716
1502
static void resolve_callback(AvahiSServiceResolver *r,
717
1503
AvahiIfIndex interface,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1504
AvahiProtocol proto,
719
1505
AvahiResolverEvent event,
720
1506
const char *name,
721
1507
const char *type,
726
1512
AVAHI_GCC_UNUSED AvahiStringList *txt,
727
1513
AVAHI_GCC_UNUSED AvahiLookupResultFlags
728
1514
flags,
729
void* userdata) {
730
mandos_context *mc = userdata;
731
assert(r);
1515
void *mc){
1516
if(r == NULL){
1517
return;
1518
}
732
1519
733
1520
/* Called whenever a service has been resolved successfully or
734
1521
timed out */
735
1522
736
switch (event) {
1523
if(quit_now){
1524
avahi_s_service_resolver_free(r);
1525
return;
1526
}
1527
1528
switch(event){
737
1529
default:
738
1530
case AVAHI_RESOLVER_FAILURE:
739
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
740
" of type '%s' in domain '%s': %s\n", name, type, domain,
741
avahi_strerror(avahi_server_errno(mc->server)));
1531
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1532
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1533
domain,
1534
avahi_strerror(avahi_server_errno
1535
(((mandos_context*)mc)->server)));
742
1536
break;
743
1537
744
1538
case AVAHI_RESOLVER_FOUND:
746
1540
char ip[AVAHI_ADDRESS_STR_MAX];
747
1541
avahi_address_snprint(ip, sizeof(ip), address);
748
1542
if(debug){
749
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
1543
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1544
PRIdMAX ") on port %" PRIu16 "\n", name,
1545
host_name, ip, (intmax_t)interface, port);
752
1546
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
1547
int ret = start_mandos_communication(ip, (in_port_t)port,
1548
interface,
1549
avahi_proto_to_af(proto),
1550
mc);
1551
if(ret == 0){
1552
avahi_simple_poll_quit(simple_poll);
1553
} else {
1554
if(not add_server(ip, (in_port_t)port, interface,
1555
avahi_proto_to_af(proto),
1556
&((mandos_context*)mc)->current_server)){
1557
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1558
" list\n", name);
1559
}
756
1560
}
757
1561
}
758
1562
}
759
1563
avahi_s_service_resolver_free(r);
760
1564
}
761
1565
762
static void browse_callback( AvahiSServiceBrowser *b,
763
AvahiIfIndex interface,
764
AvahiProtocol protocol,
765
AvahiBrowserEvent event,
766
const char *name,
767
const char *type,
768
const char *domain,
769
AVAHI_GCC_UNUSED AvahiLookupResultFlags
770
flags,
771
void* userdata) {
772
mandos_context *mc = userdata;
773
assert(b);
1566
static void browse_callback(AvahiSServiceBrowser *b,
1567
AvahiIfIndex interface,
1568
AvahiProtocol protocol,
1569
AvahiBrowserEvent event,
1570
const char *name,
1571
const char *type,
1572
const char *domain,
1573
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1574
flags,
1575
void *mc){
1576
if(b == NULL){
1577
return;
1578
}
774
1579
775
1580
/* Called whenever a new services becomes available on the LAN or
776
1581
is removed from the LAN */
777
1582
778
switch (event) {
1583
if(quit_now){
1584
return;
1585
}
1586
1587
switch(event){
779
1588
default:
780
1589
case AVAHI_BROWSER_FAILURE:
781
1590
782
fprintf(stderr, "(Avahi browser) %s\n",
783
avahi_strerror(avahi_server_errno(mc->server)));
784
avahi_simple_poll_quit(mc->simple_poll);
1591
fprintf_plus(stderr, "(Avahi browser) %s\n",
1592
avahi_strerror(avahi_server_errno
1593
(((mandos_context*)mc)->server)));
1594
avahi_simple_poll_quit(simple_poll);
785
1595
return;
786
1596
787
1597
case AVAHI_BROWSER_NEW:
790
1600
the callback function is called the Avahi server will free the
791
1601
resolver for us. */
792
1602
793
if (!(avahi_s_service_resolver_new(mc->server, interface,
794
protocol, name, type, domain,
795
AVAHI_PROTO_INET6, 0,
796
resolve_callback, mc)))
797
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
798
name, avahi_strerror(avahi_server_errno(mc->server)));
1603
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1604
interface, protocol, name, type,
1605
domain, protocol, 0,
1606
resolve_callback, mc) == NULL)
1607
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1608
" %s\n", name,
1609
avahi_strerror(avahi_server_errno
1610
(((mandos_context*)mc)->server)));
799
1611
break;
800
1612
801
1613
case AVAHI_BROWSER_REMOVE:
804
1616
case AVAHI_BROWSER_ALL_FOR_NOW:
805
1617
case AVAHI_BROWSER_CACHE_EXHAUSTED:
806
1618
if(debug){
807
fprintf(stderr, "No Mandos server found, still searching...\n");
1619
fprintf_plus(stderr, "No Mandos server found, still"
1620
" searching...\n");
808
1621
}
809
1622
break;
810
1623
}
811
1624
}
812
1625
1626
/* Signal handler that stops main loop after SIGTERM */
1627
static void handle_sigterm(int sig){
1628
if(quit_now){
1629
return;
1630
}
1631
quit_now = 1;
1632
signal_received = sig;
1633
int old_errno = errno;
1634
/* set main loop to exit */
1635
if(simple_poll != NULL){
1636
avahi_simple_poll_quit(simple_poll);
1637
}
1638
errno = old_errno;
1639
}
1640
1641
__attribute__((nonnull, warn_unused_result))
1642
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
int ret;
1644
int old_errno;
1645
1646
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1647
if(s < 0){
1648
old_errno = errno;
1649
perror_plus("socket");
1650
errno = old_errno;
1651
return false;
1652
}
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1655
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
if(ret == -1){
1657
if(debug){
1658
old_errno = errno;
1659
perror_plus("ioctl SIOCGIFFLAGS");
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1666
}
1667
return false;
1668
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1674
return true;
1675
}
1676
1677
__attribute__((nonnull, warn_unused_result))
1678
bool good_flags(const char *ifname, const struct ifreq *ifr){
1679
1680
/* Reject the loopback device */
1681
if(ifr->ifr_flags & IFF_LOOPBACK){
1682
if(debug){
1683
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1684
ifname);
1685
}
1686
return false;
1687
}
1688
/* Accept point-to-point devices only if connect_to is specified */
1689
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1690
if(debug){
1691
fprintf_plus(stderr, "Accepting point-to-point interface"
1692
" \"%s\"\n", ifname);
1693
}
1694
return true;
1695
}
1696
/* Otherwise, reject non-broadcast-capable devices */
1697
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1698
if(debug){
1699
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1700
" \"%s\"\n", ifname);
1701
}
1702
return false;
1703
}
1704
/* Reject non-ARP interfaces (including dummy interfaces) */
1705
if(ifr->ifr_flags & IFF_NOARP){
1706
if(debug){
1707
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1708
ifname);
1709
}
1710
return false;
1711
}
1712
1713
/* Accept this device */
1714
if(debug){
1715
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1716
}
1717
return true;
1718
}
1719
1720
/*
1721
* This function determines if a directory entry in /sys/class/net
1722
* corresponds to an acceptable network device.
1723
* (This function is passed to scandir(3) as a filter function.)
1724
*/
1725
__attribute__((nonnull, warn_unused_result))
1726
int good_interface(const struct dirent *if_entry){
1727
if(if_entry->d_name[0] == '.'){
1728
return 0;
1729
}
1730
1731
struct ifreq ifr;
1732
if(not get_flags(if_entry->d_name, &ifr)){
1733
if(debug){
1734
fprintf_plus(stderr, "Failed to get flags for interface "
1735
"\"%s\"\n", if_entry->d_name);
1736
}
1737
return 0;
1738
}
1739
1740
if(not good_flags(if_entry->d_name, &ifr)){
1741
return 0;
1742
}
1743
return 1;
1744
}
1745
1746
/*
1747
* This function determines if a network interface is up.
1748
*/
1749
__attribute__((nonnull, warn_unused_result))
1750
bool interface_is_up(const char *interface){
1751
struct ifreq ifr;
1752
if(not get_flags(interface, &ifr)){
1753
if(debug){
1754
fprintf_plus(stderr, "Failed to get flags for interface "
1755
"\"%s\"\n", interface);
1756
}
1757
return false;
1758
}
1759
1760
return (bool)(ifr.ifr_flags & IFF_UP);
1761
}
1762
1763
/*
1764
* This function determines if a network interface is running
1765
*/
1766
__attribute__((nonnull, warn_unused_result))
1767
bool interface_is_running(const char *interface){
1768
struct ifreq ifr;
1769
if(not get_flags(interface, &ifr)){
1770
if(debug){
1771
fprintf_plus(stderr, "Failed to get flags for interface "
1772
"\"%s\"\n", interface);
1773
}
1774
return false;
1775
}
1776
1777
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1778
}
1779
1780
__attribute__((nonnull, pure, warn_unused_result))
1781
int notdotentries(const struct dirent *direntry){
1782
/* Skip "." and ".." */
1783
if(direntry->d_name[0] == '.'
1784
and (direntry->d_name[1] == '\0'
1785
or (direntry->d_name[1] == '.'
1786
and direntry->d_name[2] == '\0'))){
1787
return 0;
1788
}
1789
return 1;
1790
}
1791
1792
/* Is this directory entry a runnable program? */
1793
__attribute__((nonnull, warn_unused_result))
1794
int runnable_hook(const struct dirent *direntry){
1795
int ret;
1796
size_t sret;
1797
struct stat st;
1798
1799
if((direntry->d_name)[0] == '\0'){
1800
/* Empty name? */
1801
return 0;
1802
}
1803
1804
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1805
"abcdefghijklmnopqrstuvwxyz"
1806
"0123456789"
1807
"_.-");
1808
if((direntry->d_name)[sret] != '\0'){
1809
/* Contains non-allowed characters */
1810
if(debug){
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1812
direntry->d_name);
1813
}
1814
return 0;
1815
}
1816
1817
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1818
if(ret == -1){
1819
if(debug){
1820
perror_plus("Could not stat hook");
1821
}
1822
return 0;
1823
}
1824
if(not (S_ISREG(st.st_mode))){
1825
/* Not a regular file */
1826
if(debug){
1827
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1828
direntry->d_name);
1829
}
1830
return 0;
1831
}
1832
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1833
/* Not executable */
1834
if(debug){
1835
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1836
direntry->d_name);
1837
}
1838
return 0;
1839
}
1840
if(debug){
1841
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1842
direntry->d_name);
1843
}
1844
return 1;
1845
}
1846
1847
__attribute__((nonnull, warn_unused_result))
1848
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1849
mandos_context *mc){
1850
int ret;
1851
struct timespec now;
1852
struct timespec waited_time;
1853
intmax_t block_time;
1854
1855
while(true){
1856
if(mc->current_server == NULL){
1857
if(debug){
1858
fprintf_plus(stderr, "Wait until first server is found."
1859
" No timeout!\n");
1860
}
1861
ret = avahi_simple_poll_iterate(s, -1);
1862
} else {
1863
if(debug){
1864
fprintf_plus(stderr, "Check current_server if we should run"
1865
" it, or wait\n");
1866
}
1867
/* the current time */
1868
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1869
if(ret == -1){
1870
perror_plus("clock_gettime");
1871
return -1;
1872
}
1873
/* Calculating in ms how long time between now and server
1874
who we visted longest time ago. Now - last seen. */
1875
waited_time.tv_sec = (now.tv_sec
1876
- mc->current_server->last_seen.tv_sec);
1877
waited_time.tv_nsec = (now.tv_nsec
1878
- mc->current_server->last_seen.tv_nsec);
1879
/* total time is 10s/10,000ms.
1880
Converting to s from ms by dividing by 1,000,
1881
and ns to ms by dividing by 1,000,000. */
1882
block_time = ((retry_interval
1883
- ((intmax_t)waited_time.tv_sec * 1000))
1884
- ((intmax_t)waited_time.tv_nsec / 1000000));
1885
1886
if(debug){
1887
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1888
block_time);
1889
}
1890
1891
if(block_time <= 0){
1892
ret = start_mandos_communication(mc->current_server->ip,
1893
mc->current_server->port,
1894
mc->current_server->if_index,
1895
mc->current_server->af, mc);
1896
if(ret == 0){
1897
avahi_simple_poll_quit(s);
1898
return 0;
1899
}
1900
ret = clock_gettime(CLOCK_MONOTONIC,
1901
&mc->current_server->last_seen);
1902
if(ret == -1){
1903
perror_plus("clock_gettime");
1904
return -1;
1905
}
1906
mc->current_server = mc->current_server->next;
1907
block_time = 0; /* Call avahi to find new Mandos
1908
servers, but don't block */
1909
}
1910
1911
ret = avahi_simple_poll_iterate(s, (int)block_time);
1912
}
1913
if(ret != 0){
1914
if(ret > 0 or errno != EINTR){
1915
return (ret != 1) ? ret : 0;
1916
}
1917
}
1918
}
1919
}
1920
1921
__attribute__((nonnull))
1922
void run_network_hooks(const char *mode, const char *interface,
1923
const float delay){
1924
struct dirent **direntries = NULL;
1925
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1928
if(hookdir_fd == -1){
1929
if(errno == ENOENT){
1930
if(debug){
1931
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1932
" found\n", hookdir);
1933
}
1934
} else {
1935
perror_plus("open");
1936
}
1937
return;
1938
}
1939
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
runnable_hook, alphasort);
1947
if(numhooks == -1){
1948
perror_plus("scandir");
1949
close(devnull);
1950
return;
1951
}
1952
struct dirent *direntry;
1953
int ret;
1954
for(int i = 0; i < numhooks; i++){
1955
direntry = direntries[i];
1956
if(debug){
1957
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1958
direntry->d_name);
1959
}
1960
pid_t hook_pid = fork();
1961
if(hook_pid == 0){
1962
/* Child */
1963
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1965
if(errno != 0){
1966
perror_plus("Failed to raise privileges");
1967
_exit(EX_NOPERM);
1968
}
1969
/* Set group */
1970
errno = 0;
1971
ret = setgid(0);
1972
if(ret == -1){
1973
perror_plus("setgid");
1974
_exit(EX_NOPERM);
1975
}
1976
/* Reset supplementary groups */
1977
errno = 0;
1978
ret = setgroups(0, NULL);
1979
if(ret == -1){
1980
perror_plus("setgroups");
1981
_exit(EX_NOPERM);
1982
}
1983
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
ret = setenv("DEVICE", interface, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1994
if(ret == -1){
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("MODE", mode, 1);
1999
if(ret == -1){
2000
perror_plus("setenv");
2001
_exit(EX_OSERR);
2002
}
2003
char *delaystring;
2004
ret = asprintf(&delaystring, "%f", (double)delay);
2005
if(ret == -1){
2006
perror_plus("asprintf");
2007
_exit(EX_OSERR);
2008
}
2009
ret = setenv("DELAY", delaystring, 1);
2010
if(ret == -1){
2011
free(delaystring);
2012
perror_plus("setenv");
2013
_exit(EX_OSERR);
2014
}
2015
free(delaystring);
2016
if(connect_to != NULL){
2017
ret = setenv("CONNECT", connect_to, 1);
2018
if(ret == -1){
2019
perror_plus("setenv");
2020
_exit(EX_OSERR);
2021
}
2022
}
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
2026
if(hook_fd == -1){
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2029
}
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2033
}
2034
ret = dup2(devnull, STDIN_FILENO);
2035
if(ret == -1){
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
_exit(EX_OSERR);
2038
}
2039
ret = close(devnull);
2040
if(ret == -1){
2041
perror_plus("close");
2042
_exit(EX_OSERR);
2043
}
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2045
if(ret == -1){
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2047
_exit(EX_OSERR);
2048
}
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2050
environ) == -1){
2051
perror_plus("fexecve");
2052
_exit(EXIT_FAILURE);
2053
}
2054
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
2060
int status;
2061
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
perror_plus("waitpid");
2063
free(direntry);
2064
continue;
2065
}
2066
if(WIFEXITED(status)){
2067
if(WEXITSTATUS(status) != 0){
2068
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
" with status %d\n", direntry->d_name,
2070
WEXITSTATUS(status));
2071
free(direntry);
2072
continue;
2073
}
2074
} else if(WIFSIGNALED(status)){
2075
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
" signal %d\n", direntry->d_name,
2077
WTERMSIG(status));
2078
free(direntry);
2079
continue;
2080
} else {
2081
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
" crashed\n", direntry->d_name);
2083
free(direntry);
2084
continue;
2085
}
2086
}
2087
if(debug){
2088
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2089
direntry->d_name);
2090
}
2091
free(direntry);
2092
}
2093
free(direntries);
2094
if(close(hookdir_fd) == -1){
2095
perror_plus("close");
2096
} else {
2097
hookdir_fd = -1;
2098
}
2099
close(devnull);
2100
}
2101
2102
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
2106
int ret;
2107
struct ifreq network;
2108
unsigned int if_index = if_nametoindex(interface);
2109
if(if_index == 0){
2110
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2111
errno = old_errno;
2112
return ENXIO;
2113
}
2114
2115
if(quit_now){
2116
errno = old_errno;
2117
return EINTR;
2118
}
2119
2120
if(not interface_is_up(interface)){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
2123
if(not get_flags(interface, &network)){
2124
ret_errno = errno;
2125
fprintf_plus(stderr, "Failed to get flags for interface "
2126
"\"%s\"\n", interface);
2127
errno = old_errno;
2128
return ret_errno;
2129
}
2130
network.ifr_flags |= IFF_UP; /* set flag */
2131
2132
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2133
if(sd == -1){
2134
ret_errno = errno;
2135
perror_plus("socket");
2136
errno = old_errno;
2137
return ret_errno;
2138
}
2139
2140
if(quit_now){
2141
ret = close(sd);
2142
if(ret == -1){
2143
perror_plus("close");
2144
}
2145
errno = old_errno;
2146
return EINTR;
2147
}
2148
2149
if(debug){
2150
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2151
interface);
2152
}
2153
2154
/* Raise privileges */
2155
ret_errno = raise_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to raise privileges");
2159
}
2160
2161
#ifdef __linux__
2162
int ret_linux;
2163
bool restore_loglevel = false;
2164
if(ret_errno == 0){
2165
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2166
messages about the network interface to mess up the prompt */
2167
ret_linux = klogctl(8, NULL, 5);
2168
if(ret_linux == -1){
2169
perror_plus("klogctl");
2170
} else {
2171
restore_loglevel = true;
2172
}
2173
}
2174
#endif /* __linux__ */
2175
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2176
ioctl_errno = errno;
2177
#ifdef __linux__
2178
if(restore_loglevel){
2179
ret_linux = klogctl(7, NULL, 0);
2180
if(ret_linux == -1){
2181
perror_plus("klogctl");
2182
}
2183
}
2184
#endif /* __linux__ */
2185
2186
/* If raise_privileges() succeeded above */
2187
if(ret_errno == 0){
2188
/* Lower privileges */
2189
ret_errno = lower_privileges();
2190
if(ret_errno != 0){
2191
errno = ret_errno;
2192
perror_plus("Failed to lower privileges");
2193
}
2194
}
2195
2196
/* Close the socket */
2197
ret = close(sd);
2198
if(ret == -1){
2199
perror_plus("close");
2200
}
2201
2202
if(ret_setflags == -1){
2203
errno = ioctl_errno;
2204
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2205
errno = old_errno;
2206
return ioctl_errno;
2207
}
2208
} else if(debug){
2209
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2210
interface);
2211
}
2212
2213
/* Sleep checking until interface is running.
2214
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
2216
if(interface_is_running(interface)){
2217
break;
2218
}
2219
struct timespec sleeptime = { .tv_nsec = 250000000 };
2220
ret = nanosleep(&sleeptime, NULL);
2221
if(ret == -1 and errno != EINTR){
2222
perror_plus("nanosleep");
2223
}
2224
}
2225
2226
errno = old_errno;
2227
return 0;
2228
}
2229
2230
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
2233
struct ifreq network;
2234
unsigned int if_index = if_nametoindex(interface);
2235
if(if_index == 0){
2236
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2237
errno = old_errno;
2238
return ENXIO;
2239
}
2240
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
2243
if(not get_flags(interface, &network) and debug){
2244
ret_errno = errno;
2245
fprintf_plus(stderr, "Failed to get flags for interface "
2246
"\"%s\"\n", interface);
2247
errno = old_errno;
2248
return ret_errno;
2249
}
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
2252
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2253
if(sd == -1){
2254
ret_errno = errno;
2255
perror_plus("socket");
2256
errno = old_errno;
2257
return ret_errno;
2258
}
2259
2260
if(debug){
2261
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2262
interface);
2263
}
2264
2265
/* Raise privileges */
2266
ret_errno = raise_privileges();
2267
if(ret_errno != 0){
2268
errno = ret_errno;
2269
perror_plus("Failed to raise privileges");
2270
}
2271
2272
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2273
ioctl_errno = errno;
2274
2275
/* If raise_privileges() succeeded above */
2276
if(ret_errno == 0){
2277
/* Lower privileges */
2278
ret_errno = lower_privileges();
2279
if(ret_errno != 0){
2280
errno = ret_errno;
2281
perror_plus("Failed to lower privileges");
2282
}
2283
}
2284
2285
/* Close the socket */
2286
int ret = close(sd);
2287
if(ret == -1){
2288
perror_plus("close");
2289
}
2290
2291
if(ret_setflags == -1){
2292
errno = ioctl_errno;
2293
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2294
errno = old_errno;
2295
return ioctl_errno;
2296
}
2297
} else if(debug){
2298
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2299
interface);
2300
}
2301
2302
errno = old_errno;
2303
return 0;
2304
}
2305
813
2306
int main(int argc, char *argv[]){
814
AvahiSServiceBrowser *sb = NULL;
815
int error;
816
int ret;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
820
int sd;
821
uid_t uid;
822
gid_t gid;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
834
835
{
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
842
.group = 1 },
843
{ .name = "interface", .key = 'i',
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
847
.group = 1 },
848
{ .name = "seckey", .key = 's',
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
851
.group = 1 },
852
{ .name = "pubkey", .key = 'p',
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
855
.group = 2 },
856
{ .name = "dh-bits", .key = 129,
857
.arg = "BITS",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
860
.group = 2 },
861
{ .name = "priority", .key = 130,
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
865
{ .name = NULL }
866
};
867
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
872
switch (key) {
873
case 128: /* --debug */
874
debug = true;
875
break;
876
case 'c': /* --connect */
877
connect_to = arg;
878
break;
879
case 'i': /* --interface */
880
interface = arg;
881
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
891
if (errno){
892
perror("strtol");
893
exit(EXIT_FAILURE);
894
}
895
break;
896
case 130: /* --priority */
897
mc.priority = arg;
898
break;
899
case ARGP_KEY_ARG:
900
argp_usage (state);
901
case ARGP_KEY_END:
902
break;
903
default:
904
return ARGP_ERR_UNKNOWN;
905
}
906
return 0;
907
}
908
909
struct argp argp = { .options = options, .parser = parse_opt,
910
.args_doc = "",
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
921
/* If the interface is down, bring it up */
922
{
923
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
924
if(sd < 0) {
925
perror("socket");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
strcpy(network.ifr_name, interface);
930
ret = ioctl(sd, SIOCGIFFLAGS, &network);
931
if(ret == -1){
932
perror("ioctl SIOCGIFFLAGS");
933
exitcode = EXIT_FAILURE;
934
goto end;
935
}
936
if((network.ifr_flags & IFF_UP) == 0){
937
network.ifr_flags |= IFF_UP;
938
ret = ioctl(sd, SIOCSIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCSIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
}
945
ret = TEMP_FAILURE_RETRY(close(sd));
946
if(ret == -1){
947
perror("close");
948
}
949
}
950
951
uid = getuid();
952
gid = getgid();
953
954
ret = setuid(uid);
955
if (ret == -1){
956
perror("setuid");
957
}
958
959
setgid(gid);
960
if (ret == -1){
961
perror("setgid");
962
}
963
964
ret = init_gnutls_global(&mc, pubkey, seckey);
965
if (ret == -1){
966
fprintf(stderr, "init_gnutls_global failed\n");
967
exitcode = EXIT_FAILURE;
968
goto end;
969
} else {
970
gnutls_initalized = true;
971
}
972
973
if(mkdtemp(tempdir) == NULL){
974
perror("mkdtemp");
975
tempdir[0] = '\0';
976
goto end;
977
}
978
979
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
980
fprintf(stderr, "pgpme_initalized failed\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
} else {
984
pgpme_initalized = true;
985
}
986
987
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
if(if_index == 0){
989
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
exit(EXIT_FAILURE);
991
}
992
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
997
if(address == NULL){
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
1000
goto end;
1001
}
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
2312
AvahiSServiceBrowser *sb = NULL;
2313
error_t ret_errno;
2314
int ret;
2315
intmax_t tmpmax;
2316
char *tmp;
2317
int exitcode = EXIT_SUCCESS;
2318
char *interfaces_to_take_down = NULL;
2319
size_t interfaces_to_take_down_size = 0;
2320
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2321
char old_tempdir[] = "/tmp/mandosXXXXXX";
2322
char *tempdir = NULL;
2323
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2324
const char *seckey = PATHDIR "/" SECKEY;
2325
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
char *interfaces_hooks = NULL;
2328
2329
bool gnutls_initialized = false;
2330
bool gpgme_initialized = false;
2331
float delay = 2.5f;
2332
double retry_interval = 10; /* 10s between trying a server and
2333
retrying the same server again */
2334
2335
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2336
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2337
2338
uid = getuid();
2339
gid = getgid();
2340
2341
/* Lower any group privileges we might have, just to be safe */
2342
errno = 0;
2343
ret = setgid(gid);
2344
if(ret == -1){
2345
perror_plus("setgid");
2346
}
2347
2348
/* Lower user privileges (temporarily) */
2349
errno = 0;
2350
ret = seteuid(uid);
2351
if(ret == -1){
2352
perror_plus("seteuid");
2353
}
2354
2355
if(quit_now){
2356
goto end;
2357
}
2358
2359
{
2360
struct argp_option options[] = {
2361
{ .name = "debug", .key = 128,
2362
.doc = "Debug mode", .group = 3 },
2363
{ .name = "connect", .key = 'c',
2364
.arg = "ADDRESS:PORT",
2365
.doc = "Connect directly to a specific Mandos server",
2366
.group = 1 },
2367
{ .name = "interface", .key = 'i',
2368
.arg = "NAME",
2369
.doc = "Network interface that will be used to search for"
2370
" Mandos servers",
2371
.group = 1 },
2372
{ .name = "seckey", .key = 's',
2373
.arg = "FILE",
2374
.doc = "OpenPGP secret key file base name",
2375
.group = 1 },
2376
{ .name = "pubkey", .key = 'p',
2377
.arg = "FILE",
2378
.doc = "OpenPGP public key file base name",
2379
.group = 2 },
2380
{ .name = "dh-bits", .key = 129,
2381
.arg = "BITS",
2382
.doc = "Bit length of the prime number used in the"
2383
" Diffie-Hellman key exchange",
2384
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
2390
{ .name = "priority", .key = 130,
2391
.arg = "STRING",
2392
.doc = "GnuTLS priority string for the TLS handshake",
2393
.group = 1 },
2394
{ .name = "delay", .key = 131,
2395
.arg = "SECONDS",
2396
.doc = "Maximum delay to wait for interface startup",
2397
.group = 2 },
2398
{ .name = "retry", .key = 132,
2399
.arg = "SECONDS",
2400
.doc = "Retry interval used when denied by the Mandos server",
2401
.group = 2 },
2402
{ .name = "network-hook-dir", .key = 133,
2403
.arg = "DIR",
2404
.doc = "Directory where network hooks are located",
2405
.group = 2 },
2406
/*
2407
* These reproduce what we would get without ARGP_NO_HELP
2408
*/
2409
{ .name = "help", .key = '?',
2410
.doc = "Give this help list", .group = -1 },
2411
{ .name = "usage", .key = -3,
2412
.doc = "Give a short usage message", .group = -1 },
2413
{ .name = "version", .key = 'V',
2414
.doc = "Print program version", .group = -1 },
2415
{ .name = NULL }
2416
};
2417
2418
error_t parse_opt(int key, char *arg,
2419
struct argp_state *state){
1002
2420
errno = 0;
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
if(errno){
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
2421
switch(key){
2422
case 128: /* --debug */
2423
debug = true;
2424
break;
2425
case 'c': /* --connect */
2426
connect_to = arg;
2427
break;
2428
case 'i': /* --interface */
2429
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2430
arg, (int)',');
2431
if(ret_errno != 0){
2432
argp_error(state, "%s", strerror(ret_errno));
2433
}
2434
break;
2435
case 's': /* --seckey */
2436
seckey = arg;
2437
break;
2438
case 'p': /* --pubkey */
2439
pubkey = arg;
2440
break;
2441
case 129: /* --dh-bits */
2442
errno = 0;
2443
tmpmax = strtoimax(arg, &tmp, 10);
2444
if(errno != 0 or tmp == arg or *tmp != '\0'
2445
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2446
argp_error(state, "Bad number of DH bits");
2447
}
2448
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2449
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
2453
case 130: /* --priority */
2454
mc.priority = arg;
2455
break;
2456
case 131: /* --delay */
2457
errno = 0;
2458
delay = strtof(arg, &tmp);
2459
if(errno != 0 or tmp == arg or *tmp != '\0'){
2460
argp_error(state, "Bad delay");
2461
}
2462
case 132: /* --retry */
2463
errno = 0;
2464
retry_interval = strtod(arg, &tmp);
2465
if(errno != 0 or tmp == arg or *tmp != '\0'
2466
or (retry_interval * 1000) > INT_MAX
2467
or retry_interval < 0){
2468
argp_error(state, "Bad retry interval");
2469
}
2470
break;
2471
case 133: /* --network-hook-dir */
2472
hookdir = arg;
2473
break;
2474
/*
2475
* These reproduce what we would get without ARGP_NO_HELP
2476
*/
2477
case '?': /* --help */
2478
argp_state_help(state, state->out_stream,
2479
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2480
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2481
case -3: /* --usage */
2482
argp_state_help(state, state->out_stream,
2483
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2484
case 'V': /* --version */
2485
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2486
exit(argp_err_exit_status);
2487
break;
2488
default:
2489
return ARGP_ERR_UNKNOWN;
2490
}
2491
return errno;
2492
}
2493
2494
struct argp argp = { .options = options, .parser = parse_opt,
2495
.args_doc = "",
2496
.doc = "Mandos client -- Get and decrypt"
2497
" passwords from a Mandos server" };
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2501
case 0:
2502
break;
2503
case ENOMEM:
2504
default:
2505
errno = ret_errno;
2506
perror_plus("argp_parse");
2507
exitcode = EX_OSERR;
2508
goto end;
2509
case EINVAL:
2510
exitcode = EX_USAGE;
2511
goto end;
2512
}
2513
}
2514
2515
{
2516
/* Work around Debian bug #633582:
2517
<https://bugs.debian.org/633582> */
2518
2519
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2523
perror_plus("Failed to raise privileges");
2524
} else {
2525
struct stat st;
2526
2527
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2528
int seckey_fd = open(seckey, O_RDONLY);
2529
if(seckey_fd == -1){
2530
perror_plus("open");
2531
} else {
2532
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2533
if(ret == -1){
2534
perror_plus("fstat");
2535
} else {
2536
if(S_ISREG(st.st_mode)
2537
and st.st_uid == 0 and st.st_gid == 0){
2538
ret = fchown(seckey_fd, uid, gid);
2539
if(ret == -1){
2540
perror_plus("fchown");
2541
}
2542
}
2543
}
2544
close(seckey_fd);
2545
}
2546
}
2547
2548
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2549
int pubkey_fd = open(pubkey, O_RDONLY);
2550
if(pubkey_fd == -1){
2551
perror_plus("open");
2552
} else {
2553
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2554
if(ret == -1){
2555
perror_plus("fstat");
2556
} else {
2557
if(S_ISREG(st.st_mode)
2558
and st.st_uid == 0 and st.st_gid == 0){
2559
ret = fchown(pubkey_fd, uid, gid);
2560
if(ret == -1){
2561
perror_plus("fchown");
2562
}
2563
}
2564
}
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2588
}
2589
}
2590
2591
/* Lower privileges */
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to lower privileges");
2596
}
2597
}
2598
}
2599
2600
/* Remove invalid interface names (except "none") */
2601
{
2602
char *interface = NULL;
2603
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2604
interface))){
2605
if(strcmp(interface, "none") != 0
2606
and if_nametoindex(interface) == 0){
2607
if(interface[0] != '\0'){
2608
fprintf_plus(stderr, "Not using nonexisting interface"
2609
" \"%s\"\n", interface);
2610
}
2611
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2612
interface = NULL;
2613
}
2614
}
2615
}
2616
2617
/* Run network hooks */
2618
{
2619
if(mc.interfaces != NULL){
2620
interfaces_hooks = malloc(mc.interfaces_size);
2621
if(interfaces_hooks == NULL){
2622
perror_plus("malloc");
1007
2623
goto end;
1008
2624
}
1009
*address = '\0';
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1012
if(ret < 0){
1013
exitcode = EXIT_FAILURE;
1014
} else {
1015
exitcode = EXIT_SUCCESS;
1016
}
1017
goto end;
1018
}
1019
1020
if (not debug){
1021
avahi_set_log_function(empty_log);
1022
}
1023
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
" object.\n");
1032
exitcode = EXIT_FAILURE;
1033
goto end;
1034
}
1035
1036
{
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1044
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1048
NULL, &error);
1049
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1052
}
1053
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1064
AVAHI_PROTO_INET6,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1067
if (sb == NULL) {
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1071
goto end;
1072
}
1073
1074
/* Run the main loop */
1075
1076
if (debug){
1077
fprintf(stderr, "Starting Avahi loop search\n");
1078
}
1079
1080
avahi_simple_poll_loop(mc.simple_poll);
1081
2625
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2626
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2627
}
2628
run_network_hooks("start", interfaces_hooks != NULL ?
2629
interfaces_hooks : "", delay);
2630
}
2631
2632
if(not debug){
2633
avahi_set_log_function(empty_log);
2634
}
2635
2636
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2637
from the signal handler */
2638
/* Initialize the pseudo-RNG for Avahi */
2639
srand((unsigned int) time(NULL));
2640
simple_poll = avahi_simple_poll_new();
2641
if(simple_poll == NULL){
2642
fprintf_plus(stderr,
2643
"Avahi: Failed to create simple poll object.\n");
2644
exitcode = EX_UNAVAILABLE;
2645
goto end;
2646
}
2647
2648
sigemptyset(&sigterm_action.sa_mask);
2649
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2650
if(ret == -1){
2651
perror_plus("sigaddset");
2652
exitcode = EX_OSERR;
2653
goto end;
2654
}
2655
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2656
if(ret == -1){
2657
perror_plus("sigaddset");
2658
exitcode = EX_OSERR;
2659
goto end;
2660
}
2661
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2662
if(ret == -1){
2663
perror_plus("sigaddset");
2664
exitcode = EX_OSERR;
2665
goto end;
2666
}
2667
/* Need to check if the handler is SIG_IGN before handling:
2668
| [[info:libc:Initial Signal Actions]] |
2669
| [[info:libc:Basic Signal Handling]] |
2670
*/
2671
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2672
if(ret == -1){
2673
perror_plus("sigaction");
2674
return EX_OSERR;
2675
}
2676
if(old_sigterm_action.sa_handler != SIG_IGN){
2677
ret = sigaction(SIGINT, &sigterm_action, NULL);
2678
if(ret == -1){
2679
perror_plus("sigaction");
2680
exitcode = EX_OSERR;
2681
goto end;
2682
}
2683
}
2684
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2685
if(ret == -1){
2686
perror_plus("sigaction");
2687
return EX_OSERR;
2688
}
2689
if(old_sigterm_action.sa_handler != SIG_IGN){
2690
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2691
if(ret == -1){
2692
perror_plus("sigaction");
2693
exitcode = EX_OSERR;
2694
goto end;
2695
}
2696
}
2697
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2698
if(ret == -1){
2699
perror_plus("sigaction");
2700
return EX_OSERR;
2701
}
2702
if(old_sigterm_action.sa_handler != SIG_IGN){
2703
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2704
if(ret == -1){
2705
perror_plus("sigaction");
2706
exitcode = EX_OSERR;
2707
goto end;
2708
}
2709
}
2710
2711
/* If no interfaces were specified, make a list */
2712
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2714
/* Look for any good interfaces */
2715
ret = scandir(sys_class_net, &direntries, good_interface,
2716
alphasort);
2717
if(ret >= 1){
2718
/* Add all found interfaces to interfaces list */
2719
for(int i = 0; i < ret; ++i){
2720
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2721
direntries[i]->d_name);
2722
if(ret_errno != 0){
2723
errno = ret_errno;
2724
perror_plus("argz_add");
2725
free(direntries[i]);
2726
continue;
2727
}
2728
if(debug){
2729
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2730
direntries[i]->d_name);
2731
}
2732
free(direntries[i]);
2733
}
2734
free(direntries);
2735
} else {
2736
if(ret == 0){
2737
free(direntries);
2738
}
2739
fprintf_plus(stderr, "Could not find a network interface\n");
2740
exitcode = EXIT_FAILURE;
2741
goto end;
2742
}
2743
}
2744
2745
/* Bring up interfaces which are down, and remove any "none"s */
2746
{
2747
char *interface = NULL;
2748
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2749
interface))){
2750
/* If interface name is "none", stop bringing up interfaces.
2751
Also remove all instances of "none" from the list */
2752
if(strcmp(interface, "none") == 0){
2753
argz_delete(&mc.interfaces, &mc.interfaces_size,
2754
interface);
2755
interface = NULL;
2756
while((interface = argz_next(mc.interfaces,
2757
mc.interfaces_size, interface))){
2758
if(strcmp(interface, "none") == 0){
2759
argz_delete(&mc.interfaces, &mc.interfaces_size,
2760
interface);
2761
interface = NULL;
2762
}
2763
}
2764
break;
2765
}
2766
bool interface_was_up = interface_is_up(interface);
2767
errno = bring_up_interface(interface, delay);
2768
if(not interface_was_up){
2769
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2772
} else {
2773
errno = argz_add(&interfaces_to_take_down,
2774
&interfaces_to_take_down_size,
2775
interface);
2776
if(errno != 0){
2777
perror_plus("argz_add");
2778
}
2779
}
2780
}
2781
}
2782
if(debug and (interfaces_to_take_down == NULL)){
2783
fprintf_plus(stderr, "No interfaces were brought up\n");
2784
}
2785
}
2786
2787
/* If we only got one interface, explicitly use only that one */
2788
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2789
if(debug){
2790
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2791
mc.interfaces);
2792
}
2793
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2794
}
2795
2796
if(quit_now){
2797
goto end;
2798
}
2799
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2801
if(ret == -1){
2802
fprintf_plus(stderr, "init_gnutls_global failed\n");
2803
exitcode = EX_UNAVAILABLE;
2804
goto end;
2805
} else {
2806
gnutls_initialized = true;
2807
}
2808
2809
if(quit_now){
2810
goto end;
2811
}
2812
2813
/* Try /run/tmp before /tmp */
2814
tempdir = mkdtemp(run_tempdir);
2815
if(tempdir == NULL and errno == ENOENT){
2816
if(debug){
2817
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2818
run_tempdir, old_tempdir);
2819
}
2820
tempdir = mkdtemp(old_tempdir);
2821
}
2822
if(tempdir == NULL){
2823
perror_plus("mkdtemp");
2824
goto end;
2825
}
2826
2827
if(quit_now){
2828
goto end;
2829
}
2830
2831
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2832
fprintf_plus(stderr, "init_gpgme failed\n");
2833
exitcode = EX_UNAVAILABLE;
2834
goto end;
2835
} else {
2836
gpgme_initialized = true;
2837
}
2838
2839
if(quit_now){
2840
goto end;
2841
}
2842
2843
if(connect_to != NULL){
2844
/* Connect directly, do not use Zeroconf */
2845
/* (Mainly meant for debugging) */
2846
char *address = strrchr(connect_to, ':');
2847
2848
if(address == NULL){
2849
fprintf_plus(stderr, "No colon in address\n");
2850
exitcode = EX_USAGE;
2851
goto end;
2852
}
2853
2854
if(quit_now){
2855
goto end;
2856
}
2857
2858
in_port_t port;
2859
errno = 0;
2860
tmpmax = strtoimax(address+1, &tmp, 10);
2861
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2862
or tmpmax != (in_port_t)tmpmax){
2863
fprintf_plus(stderr, "Bad port number\n");
2864
exitcode = EX_USAGE;
2865
goto end;
2866
}
2867
2868
if(quit_now){
2869
goto end;
2870
}
2871
2872
port = (in_port_t)tmpmax;
2873
*address = '\0';
2874
/* Colon in address indicates IPv6 */
2875
int af;
2876
if(strchr(connect_to, ':') != NULL){
2877
af = AF_INET6;
2878
/* Accept [] around IPv6 address - see RFC 5952 */
2879
if(connect_to[0] == '[' and address[-1] == ']')
2880
{
2881
connect_to++;
2882
address[-1] = '\0';
2883
}
2884
} else {
2885
af = AF_INET;
2886
}
2887
address = connect_to;
2888
2889
if(quit_now){
2890
goto end;
2891
}
2892
2893
while(not quit_now){
2894
ret = start_mandos_communication(address, port, if_index, af,
2895
&mc);
2896
if(quit_now or ret == 0){
2897
break;
2898
}
2899
if(debug){
2900
fprintf_plus(stderr, "Retrying in %d seconds\n",
2901
(int)retry_interval);
2902
}
2903
sleep((unsigned int)retry_interval);
2904
}
2905
2906
if(not quit_now){
2907
exitcode = EXIT_SUCCESS;
2908
}
2909
2910
goto end;
2911
}
2912
2913
if(quit_now){
2914
goto end;
2915
}
2916
2917
{
2918
AvahiServerConfig config;
2919
/* Do not publish any local Zeroconf records */
2920
avahi_server_config_init(&config);
2921
config.publish_hinfo = 0;
2922
config.publish_addresses = 0;
2923
config.publish_workstation = 0;
2924
config.publish_domain = 0;
2925
2926
/* Allocate a new server */
2927
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2928
&config, NULL, NULL, &ret);
2929
2930
/* Free the Avahi configuration data */
2931
avahi_server_config_free(&config);
2932
}
2933
2934
/* Check if creating the Avahi server object succeeded */
2935
if(mc.server == NULL){
2936
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2937
avahi_strerror(ret));
2938
exitcode = EX_UNAVAILABLE;
2939
goto end;
2940
}
2941
2942
if(quit_now){
2943
goto end;
2944
}
2945
2946
/* Create the Avahi service browser */
2947
sb = avahi_s_service_browser_new(mc.server, if_index,
2948
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2949
NULL, 0, browse_callback,
2950
(void *)&mc);
2951
if(sb == NULL){
2952
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2953
avahi_strerror(avahi_server_errno(mc.server)));
2954
exitcode = EX_UNAVAILABLE;
2955
goto end;
2956
}
2957
2958
if(quit_now){
2959
goto end;
2960
}
2961
2962
/* Run the main loop */
2963
2964
if(debug){
2965
fprintf_plus(stderr, "Starting Avahi loop search\n");
2966
}
2967
2968
ret = avahi_loop_with_timeout(simple_poll,
2969
(int)(retry_interval * 1000), &mc);
2970
if(debug){
2971
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2972
(ret == 0) ? "successfully" : "with error");
2973
}
2974
1082
2975
end:
1083
1084
if (debug){
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1086
}
1087
1088
/* Cleanup things */
1089
if (sb != NULL)
1090
avahi_s_service_browser_free(sb);
1091
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1094
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1097
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1101
}
1102
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
2976
2977
if(debug){
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2985
}
2986
2987
/* Cleanup things */
2988
free(mc.interfaces);
2989
2990
if(sb != NULL)
2991
avahi_s_service_browser_free(sb);
2992
2993
if(mc.server != NULL)
2994
avahi_server_free(mc.server);
2995
2996
if(simple_poll != NULL)
2997
avahi_simple_poll_free(simple_poll);
2998
2999
if(gnutls_initialized){
3000
gnutls_certificate_free_credentials(mc.cred);
3001
gnutls_dh_params_deinit(mc.dh_params);
3002
}
3003
3004
if(gpgme_initialized){
3005
gpgme_release(mc.ctx);
3006
}
3007
3008
/* Cleans up the circular linked list of Mandos servers the client
3009
has seen */
3010
if(mc.current_server != NULL){
3011
mc.current_server->prev->next = NULL;
3012
while(mc.current_server != NULL){
3013
server *next = mc.current_server->next;
3014
#ifdef __GNUC__
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3017
#endif
3018
free((char *)(mc.current_server->ip));
3019
#ifdef __GNUC__
3020
#pragma GCC diagnostic pop
3021
#endif
3022
free(mc.current_server);
3023
mc.current_server = next;
3024
}
3025
}
3026
3027
/* Re-raise privileges */
3028
{
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to raise privileges");
3033
} else {
3034
3035
/* Run network hooks */
3036
run_network_hooks("stop", interfaces_hooks != NULL ?
3037
interfaces_hooks : "", delay);
3038
3039
/* Take down the network interfaces which were brought up */
3040
{
3041
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
3048
perror_plus("Failed to take down interface");
3049
}
3050
}
3051
if(debug and (interfaces_to_take_down == NULL)){
3052
fprintf_plus(stderr, "No interfaces needed to be taken"
3053
" down\n");
3054
}
3055
}
3056
}
3057
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
3061
perror_plus("Failed to lower privileges permanently");
3062
}
3063
}
3064
3065
free(interfaces_to_take_down);
3066
free(interfaces_hooks);
3067
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
3070
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
3122
/* Removes the GPGME temp directory and all files inside */
3123
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
3125
}
3126
3127
if(quit_now){
3128
sigemptyset(&old_sigterm_action.sa_mask);
3129
old_sigterm_action.sa_handler = SIG_DFL;
3130
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3131
&old_sigterm_action,
3132
NULL));
3133
if(ret == -1){
3134
perror_plus("sigaction");
3135
}
3136
do {
3137
ret = raise(signal_received);
3138
} while(ret != 0 and errno == EINTR);
3139
if(ret != 0){
3140
perror_plus("raise");
3141
abort();
3142
}
3143
TEMP_FAILURE_RETRY(pause());
3144
}
3145
3146
return exitcode;
1144
3147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0