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237.7.151
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2012-06-16 23:39:10 UTC
- mto: (301.1.1 release) (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 302.
- Revision ID: teddy@recompile.se-20120616233910-jxxxriq608qa6o8z
* plugins.d/mandos-client (mandos_context): New "interfaces" and
"interfaces_size" members.
(main): Removed "interfaces" and "interfaces_size" variabled; all
users changed.
"interfaces_size" members.
(main): Removed "interfaces" and "interfaces_size" variabled; all
users changed.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- 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
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
40
45
#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 */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
58
inet_pton(), connect() */
55
59
#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
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
61
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
68
SIOCSIFFLAGS, if_indextoname(),
63
69
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
65
73
#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 */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <iso646.h> /* not, or, and */
70
78
#include <argp.h> /* struct argp_option, error_t, struct
71
79
argp_state, struct argp,
72
80
argp_parse(), ARGP_KEY_ARG,
73
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
95
#ifdef __linux__
96
#include <sys/klog.h> /* klogctl() */
97
#endif /* __linux__ */
74
98
75
99
/* Avahi */
76
100
/* All Avahi types, constants and functions
89
113
gnutls_*
90
114
init_gnutls_session(),
91
115
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
116
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
94
119
95
120
/* GPGME */
96
121
#include <gpgme.h> /* All GPGME types, constants and
101
126
102
127
#define BUFFER_SIZE 256
103
128
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
129
#define PATHDIR "/conf/conf.d/mandos"
109
130
#define SECKEY "seckey.txt"
110
#define PUBKEY "pupkey.txt"
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
111
133
112
134
bool debug = false;
113
135
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>";
136
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
116
154
117
155
/* Used for passing in values through the Avahi callback functions */
118
156
typedef struct {
119
AvahiSimplePoll *simple_poll;
120
157
AvahiServer *server;
121
158
gnutls_certificate_credentials_t cred;
122
159
unsigned int dh_bits;
123
160
gnutls_dh_params_t dh_params;
124
161
const char *priority;
125
162
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
126
166
} mandos_context;
127
167
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
170
171
sig_atomic_t quit_now = 0;
172
int signal_received = 0;
173
174
/* Function to use when printing errors */
175
void perror_plus(const char *print_text){
176
int e = errno;
177
fprintf(stderr, "Mandos plugin %s: ",
178
program_invocation_short_name);
179
errno = e;
180
perror(print_text);
181
}
182
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
128
193
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
* bytes. "buffer_capacity" is how much is currently allocated,
131
196
* "buffer_length" is how much is already used.
132
197
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
198
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
202
if(buffer == NULL){
138
203
return 0;
139
204
}
140
205
buffer_capacity += BUFFER_SIZE;
142
207
return buffer_capacity;
143
208
}
144
209
210
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
213
int ret;
214
server *new_server = malloc(sizeof(server));
215
if(new_server == NULL){
216
perror_plus("malloc");
217
return false;
218
}
219
*new_server = (server){ .ip = strdup(ip),
220
.port = port,
221
.if_index = if_index,
222
.af = af };
223
if(new_server->ip == NULL){
224
perror_plus("strdup");
225
return false;
226
}
227
/* Special case of first server */
228
if(*current_server == NULL){
229
new_server->next = new_server;
230
new_server->prev = new_server;
231
*current_server = new_server;
232
/* Place the new server last in the list */
233
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
236
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
return true;
245
}
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145
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/*
146
248
* Initialize GPGME.
147
249
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
151
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gpgme_error_t rc;
152
253
gpgme_engine_info_t engine_info;
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255
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
256
* Helper function to insert pub and seckey to the engine keyring.
157
257
*/
158
258
bool import_key(const char *filename){
259
int ret;
159
260
int fd;
160
261
gpgme_data_t pgp_data;
161
262
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
264
if(fd == -1){
164
perror("open");
265
perror_plus("open");
165
266
return false;
166
267
}
167
268
168
269
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));
270
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
172
273
return false;
173
274
}
174
275
175
276
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));
277
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
179
280
return false;
180
281
}
181
182
ret = TEMP_FAILURE_RETRY(close(fd));
282
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
284
if(ret == -1){
184
perror("close");
285
perror_plus("close");
185
286
}
186
287
gpgme_data_release(pgp_data);
187
288
return true;
188
289
}
189
290
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
291
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
192
293
}
193
294
194
295
/* Init GPGME */
195
296
gpgme_check_version(NULL);
196
297
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));
298
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
200
301
return false;
201
302
}
202
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));
303
304
/* Set GPGME home directory for the OpenPGP engine only */
305
rc = gpgme_get_engine_info(&engine_info);
306
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
208
309
return false;
209
310
}
210
311
while(engine_info != NULL){
216
317
engine_info = engine_info->next;
217
318
}
218
319
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
220
322
return false;
221
323
}
222
324
223
325
/* Create new GPGME "context" */
224
326
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;
327
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
331
return false;
332
}
333
334
if(not import_key(pubkey) or not import_key(seckey)){
335
return false;
336
}
337
338
return true;
236
339
}
237
340
238
341
/*
239
342
* Decrypt OpenPGP data.
240
343
* Returns -1 on error
241
344
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
246
349
gpgme_data_t dh_crypto, dh_plain;
247
350
gpgme_error_t rc;
248
351
ssize_t ret;
249
352
size_t plaintext_capacity = 0;
250
353
ssize_t plaintext_length = 0;
251
354
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
355
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
254
357
}
255
358
256
359
/* Create new GPGME data buffer from memory cryptotext */
257
360
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
361
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));
362
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
262
365
return -1;
263
366
}
264
367
265
368
/* Create new empty GPGME data buffer for the plaintext */
266
369
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));
370
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
270
374
gpgme_data_release(dh_crypto);
271
375
return -1;
272
376
}
274
378
/* Decrypt data from the cryptotext data buffer to the plaintext
275
379
data buffer */
276
380
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));
381
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
280
384
plaintext_length = -1;
281
if (debug){
385
if(debug){
282
386
gpgme_decrypt_result_t result;
283
387
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
388
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
286
390
} 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);
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
291
395
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
293
397
}
294
398
gpgme_recipient_t recipient;
295
399
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
}
400
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
306
409
}
307
410
}
308
411
}
310
413
}
311
414
312
415
if(debug){
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
314
417
}
315
418
316
419
/* 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");
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
319
422
plaintext_length = -1;
320
423
goto decrypt_end;
321
424
}
322
425
323
426
*plaintext = NULL;
324
427
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;
428
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
431
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
332
435
}
333
436
334
437
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
438
BUFFER_SIZE);
336
439
/* Print the data, if any */
337
if (ret == 0){
440
if(ret == 0){
338
441
/* EOF */
339
442
break;
340
443
}
341
444
if(ret < 0){
342
perror("gpgme_data_read");
445
perror_plus("gpgme_data_read");
343
446
plaintext_length = -1;
344
447
goto decrypt_end;
345
448
}
347
450
}
348
451
349
452
if(debug){
350
fprintf(stderr, "Decrypted password is: ");
453
fprintf_plus(stderr, "Decrypted password is: ");
351
454
for(ssize_t i = 0; i < plaintext_length; i++){
352
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
353
456
}
364
467
return plaintext_length;
365
468
}
366
469
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
370
473
ret = "(unknown)";
371
474
return ret;
372
475
}
374
477
/* GnuTLS log function callback */
375
478
static void debuggnutls(__attribute__((unused)) int level,
376
479
const char* string){
377
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
378
481
}
379
482
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
483
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
383
486
int ret;
384
487
385
488
if(debug){
386
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
387
490
}
388
491
389
492
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
393
496
return -1;
394
497
}
395
498
396
if (debug){
499
if(debug){
397
500
/* "Use a log level over 10 to enable all debugging options."
398
501
* - GnuTLS manual
399
502
*/
402
505
}
403
506
404
507
/* 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 ();
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
if(ret != GNUTLS_E_SUCCESS){
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
411
513
return -1;
412
514
}
413
515
414
516
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
418
521
}
419
522
420
523
ret = gnutls_certificate_set_openpgp_key_file
421
524
(mc->cred, pubkeyfilename, seckeyfilename,
422
525
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));
526
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
429
532
goto globalfail;
430
533
}
431
534
432
535
/* GnuTLS server initialization */
433
536
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));
537
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
437
541
goto globalfail;
438
542
}
439
543
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));
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
443
547
goto globalfail;
444
548
}
445
549
451
555
452
556
gnutls_certificate_free_credentials(mc->cred);
453
557
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
454
559
return -1;
455
560
}
456
561
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
459
564
int ret;
460
565
/* 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));
566
do {
567
ret = gnutls_init(session, GNUTLS_SERVER);
568
if(quit_now){
569
return -1;
570
}
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
572
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
465
576
}
466
577
467
578
{
468
579
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);
580
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
582
if(quit_now){
583
gnutls_deinit(*session);
584
return -1;
585
}
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
587
if(ret != GNUTLS_E_SUCCESS){
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
591
gnutls_deinit(*session);
475
592
return -1;
476
593
}
477
594
}
478
595
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);
596
do {
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
599
if(quit_now){
600
gnutls_deinit(*session);
601
return -1;
602
}
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
604
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
607
gnutls_deinit(*session);
485
608
return -1;
486
609
}
487
610
488
611
/* ignore client certificate if any. */
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
491
613
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
493
615
494
616
return 0;
495
617
}
499
621
__attribute__((unused)) const char *txt){}
500
622
501
623
/* Called when a Mandos server is found */
502
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
503
625
AvahiIfIndex if_index,
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
626
int af, mandos_context *mc){
627
int ret, tcp_sd = -1;
628
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
507
633
char *buffer = NULL;
508
char *decrypted_buffer;
634
char *decrypted_buffer = NULL;
509
635
size_t buffer_length = 0;
510
636
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
512
637
size_t written;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
638
int retval = -1;
515
639
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");
536
return -1;
537
}
538
fprintf(stderr, "Binding to interface %s\n", interface);
640
int pf; /* Protocol family */
641
642
errno = 0;
643
644
if(quit_now){
645
errno = EINTR;
646
return -1;
647
}
648
649
switch(af){
650
case AF_INET6:
651
pf = PF_INET6;
652
break;
653
case AF_INET:
654
pf = PF_INET;
655
break;
656
default:
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
errno = EINVAL;
659
return -1;
660
}
661
662
ret = init_gnutls_session(&session, mc);
663
if(ret != 0){
664
return -1;
665
}
666
667
if(debug){
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
670
}
671
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
673
if(tcp_sd < 0){
674
int e = errno;
675
perror_plus("socket");
676
errno = e;
677
goto mandos_end;
678
}
679
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
539
683
}
540
684
541
685
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");
548
return -1;
686
if(af == AF_INET6){
687
to.in6.sin6_family = (sa_family_t)af;
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
689
} else { /* IPv4 */
690
to.in.sin_family = (sa_family_t)af;
691
ret = inet_pton(af, ip, &to.in.sin_addr);
692
}
693
if(ret < 0 ){
694
int e = errno;
695
perror_plus("inet_pton");
696
errno = e;
697
goto mandos_end;
549
698
}
550
699
if(ret == 0){
551
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
700
int e = errno;
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
702
errno = e;
703
goto mandos_end;
704
}
705
if(af == AF_INET6){
706
to.in6.sin6_port = htons(port);
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
710
if(if_index == AVAHI_IF_UNSPEC){
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
713
errno = EINVAL;
714
goto mandos_end;
715
}
716
/* Set the network interface number as scope */
717
to.in6.sin6_scope_id = (uint32_t)if_index;
718
}
719
} else {
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
723
}
555
724
556
to.in6.sin6_scope_id = (uint32_t)if_index;
725
if(quit_now){
726
errno = EINTR;
727
goto mandos_end;
728
}
557
729
558
730
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");
731
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
732
char interface[IF_NAMESIZE];
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
734
perror_plus("if_indextoname");
735
} else {
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
738
}
739
} else {
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
742
}
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
745
const char *pcret;
746
if(af == AF_INET6){
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
748
sizeof(addrstr));
749
} else {
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
sizeof(addrstr));
752
}
753
if(pcret == NULL){
754
perror_plus("inet_ntop");
565
755
} else {
566
756
if(strcmp(addrstr, ip) != 0){
567
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
568
758
}
569
759
}
570
760
}
571
761
572
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
574
perror("connect");
575
return -1;
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
767
if(af == AF_INET6){
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
} else {
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
771
}
772
if(ret < 0){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
778
goto mandos_end;
779
}
780
781
if(quit_now){
782
errno = EINTR;
783
goto mandos_end;
576
784
}
577
785
578
786
const char *out = mandos_protocol_version;
579
787
written = 0;
580
while (true){
788
while(true){
581
789
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;
790
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
791
out_size - written));
792
if(ret == -1){
793
int e = errno;
794
perror_plus("write");
795
errno = e;
587
796
goto mandos_end;
588
797
}
589
798
written += (size_t)ret;
590
799
if(written < out_size){
591
800
continue;
592
801
} else {
593
if (out == mandos_protocol_version){
802
if(out == mandos_protocol_version){
594
803
written = 0;
595
804
out = "\r\n";
596
805
} else {
597
806
break;
598
807
}
599
808
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
600
814
}
601
815
602
816
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);
817
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
818
}
819
820
if(quit_now){
821
errno = EINTR;
822
goto mandos_end;
823
}
824
825
/* This casting via intptr_t is to eliminate warning about casting
826
an int to a pointer type. This is exactly how the GnuTLS Guile
827
function "set-session-transport-fd!" does it. */
828
gnutls_transport_set_ptr(session,
829
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
836
do {
837
ret = gnutls_handshake(session);
838
if(quit_now){
839
errno = EINTR;
840
goto mandos_end;
841
}
610
842
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
611
843
612
if (ret != GNUTLS_E_SUCCESS){
844
if(ret != GNUTLS_E_SUCCESS){
613
845
if(debug){
614
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
847
gnutls_perror(ret);
616
848
}
617
retval = -1;
849
errno = EPROTO;
618
850
goto mandos_end;
619
851
}
620
852
621
853
/* Read OpenPGP packet that contains the wanted password */
622
854
623
855
if(debug){
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
ip);
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
626
858
}
627
859
628
860
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){
861
862
if(quit_now){
863
errno = EINTR;
864
goto mandos_end;
865
}
866
867
buffer_capacity = incbuffer(&buffer, buffer_length,
868
buffer_capacity);
869
if(buffer_capacity == 0){
870
int e = errno;
871
perror_plus("incbuffer");
872
errno = e;
873
goto mandos_end;
874
}
875
876
if(quit_now){
877
errno = EINTR;
878
goto mandos_end;
879
}
880
881
sret = gnutls_record_recv(session, buffer+buffer_length,
882
BUFFER_SIZE);
883
if(sret == 0){
640
884
break;
641
885
}
642
if (ret < 0){
643
switch(ret){
886
if(sret < 0){
887
switch(sret){
644
888
case GNUTLS_E_INTERRUPTED:
645
889
case GNUTLS_E_AGAIN:
646
890
break;
647
891
case GNUTLS_E_REHANDSHAKE:
648
do{
649
ret = gnutls_handshake (session);
892
do {
893
ret = gnutls_handshake(session);
894
895
if(quit_now){
896
errno = EINTR;
897
goto mandos_end;
898
}
650
899
} 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;
900
if(ret < 0){
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
903
gnutls_perror(ret);
904
errno = EPROTO;
655
905
goto mandos_end;
656
906
}
657
907
break;
658
908
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);
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
911
gnutls_bye(session, GNUTLS_SHUT_RDWR);
912
errno = EIO;
663
913
goto mandos_end;
664
914
}
665
915
} else {
666
buffer_length += (size_t) ret;
916
buffer_length += (size_t) sret;
667
917
}
668
918
}
669
919
670
920
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){
921
fprintf_plus(stderr, "Closing TLS session\n");
922
}
923
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
929
do {
930
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
931
if(quit_now){
932
errno = EINTR;
933
goto mandos_end;
934
}
935
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
936
937
if(buffer_length > 0){
938
ssize_t decrypted_buffer_size;
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
940
&decrypted_buffer, mc);
941
if(decrypted_buffer_size >= 0){
942
681
943
written = 0;
682
944
while(written < (size_t) decrypted_buffer_size){
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
950
ret = (int)fwrite(decrypted_buffer + written, 1,
951
(size_t)decrypted_buffer_size - written,
952
stdout);
686
953
if(ret == 0 and ferror(stdout)){
954
int e = errno;
687
955
if(debug){
688
fprintf(stderr, "Error writing encrypted data: %s\n",
689
strerror(errno));
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
690
958
}
691
retval = -1;
692
break;
959
errno = e;
960
goto mandos_end;
693
961
}
694
962
written += (size_t)ret;
695
963
}
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
964
retval = 0;
699
965
}
700
} else {
701
retval = -1;
702
966
}
703
967
704
968
/* Shutdown procedure */
705
969
706
970
mandos_end:
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
971
{
972
int e = errno;
973
free(decrypted_buffer);
974
free(buffer);
975
if(tcp_sd >= 0){
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
977
}
978
if(ret == -1){
979
if(e == 0){
980
e = errno;
981
}
982
perror_plus("close");
983
}
984
gnutls_deinit(session);
985
errno = e;
986
if(quit_now){
987
errno = EINTR;
988
retval = -1;
989
}
711
990
}
712
gnutls_deinit (session);
713
991
return retval;
714
992
}
715
993
716
994
static void resolve_callback(AvahiSServiceResolver *r,
717
995
AvahiIfIndex interface,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
996
AvahiProtocol proto,
719
997
AvahiResolverEvent event,
720
998
const char *name,
721
999
const char *type,
726
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
727
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
728
1006
flags,
729
void* userdata) {
730
mandos_context *mc = userdata;
731
assert(r);
1007
void* mc){
1008
if(r == NULL){
1009
return;
1010
}
732
1011
733
1012
/* Called whenever a service has been resolved successfully or
734
1013
timed out */
735
1014
736
switch (event) {
1015
if(quit_now){
1016
return;
1017
}
1018
1019
switch(event){
737
1020
default:
738
1021
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)));
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1024
domain,
1025
avahi_strerror(avahi_server_errno
1026
(((mandos_context*)mc)->server)));
742
1027
break;
743
1028
744
1029
case AVAHI_RESOLVER_FOUND:
746
1031
char ip[AVAHI_ADDRESS_STR_MAX];
747
1032
avahi_address_snprint(ip, sizeof(ip), address);
748
1033
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);
1034
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1035
PRIdMAX ") on port %" PRIu16 "\n", name,
1036
host_name, ip, (intmax_t)interface, port);
752
1037
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
1038
int ret = start_mandos_communication(ip, (in_port_t)port,
1039
interface,
1040
avahi_proto_to_af(proto),
1041
mc);
1042
if(ret == 0){
1043
avahi_simple_poll_quit(simple_poll);
1044
} else {
1045
if(not add_server(ip, (in_port_t)port, interface,
1046
avahi_proto_to_af(proto),
1047
&((mandos_context*)mc)->current_server)){
1048
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1049
" list\n", name);
1050
}
756
1051
}
757
1052
}
758
1053
}
759
1054
avahi_s_service_resolver_free(r);
760
1055
}
761
1056
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);
1057
static void browse_callback(AvahiSServiceBrowser *b,
1058
AvahiIfIndex interface,
1059
AvahiProtocol protocol,
1060
AvahiBrowserEvent event,
1061
const char *name,
1062
const char *type,
1063
const char *domain,
1064
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1065
flags,
1066
void* mc){
1067
if(b == NULL){
1068
return;
1069
}
774
1070
775
1071
/* Called whenever a new services becomes available on the LAN or
776
1072
is removed from the LAN */
777
1073
778
switch (event) {
1074
if(quit_now){
1075
return;
1076
}
1077
1078
switch(event){
779
1079
default:
780
1080
case AVAHI_BROWSER_FAILURE:
781
1081
782
fprintf(stderr, "(Avahi browser) %s\n",
783
avahi_strerror(avahi_server_errno(mc->server)));
784
avahi_simple_poll_quit(mc->simple_poll);
1082
fprintf_plus(stderr, "(Avahi browser) %s\n",
1083
avahi_strerror(avahi_server_errno
1084
(((mandos_context*)mc)->server)));
1085
avahi_simple_poll_quit(simple_poll);
785
1086
return;
786
1087
787
1088
case AVAHI_BROWSER_NEW:
790
1091
the callback function is called the Avahi server will free the
791
1092
resolver for us. */
792
1093
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)));
1094
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1095
interface, protocol, name, type,
1096
domain, protocol, 0,
1097
resolve_callback, mc) == NULL)
1098
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1099
" %s\n", name,
1100
avahi_strerror(avahi_server_errno
1101
(((mandos_context*)mc)->server)));
799
1102
break;
800
1103
801
1104
case AVAHI_BROWSER_REMOVE:
804
1107
case AVAHI_BROWSER_ALL_FOR_NOW:
805
1108
case AVAHI_BROWSER_CACHE_EXHAUSTED:
806
1109
if(debug){
807
fprintf(stderr, "No Mandos server found, still searching...\n");
1110
fprintf_plus(stderr, "No Mandos server found, still"
1111
" searching...\n");
808
1112
}
809
1113
break;
810
1114
}
811
1115
}
812
1116
1117
/* Signal handler that stops main loop after SIGTERM */
1118
static void handle_sigterm(int sig){
1119
if(quit_now){
1120
return;
1121
}
1122
quit_now = 1;
1123
signal_received = sig;
1124
int old_errno = errno;
1125
/* set main loop to exit */
1126
if(simple_poll != NULL){
1127
avahi_simple_poll_quit(simple_poll);
1128
}
1129
errno = old_errno;
1130
}
1131
1132
bool get_flags(const char *ifname, struct ifreq *ifr){
1133
int ret;
1134
error_t ret_errno;
1135
1136
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1137
if(s < 0){
1138
ret_errno = errno;
1139
perror_plus("socket");
1140
errno = ret_errno;
1141
return false;
1142
}
1143
strcpy(ifr->ifr_name, ifname);
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
if(ret == -1){
1146
if(debug){
1147
ret_errno = errno;
1148
perror_plus("ioctl SIOCGIFFLAGS");
1149
errno = ret_errno;
1150
}
1151
return false;
1152
}
1153
return true;
1154
}
1155
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1158
/* Reject the loopback device */
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
if(debug){
1161
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1162
ifname);
1163
}
1164
return false;
1165
}
1166
/* Accept point-to-point devices only if connect_to is specified */
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
if(debug){
1169
fprintf_plus(stderr, "Accepting point-to-point interface"
1170
" \"%s\"\n", ifname);
1171
}
1172
return true;
1173
}
1174
/* Otherwise, reject non-broadcast-capable devices */
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
if(debug){
1177
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1178
" \"%s\"\n", ifname);
1179
}
1180
return false;
1181
}
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
if(ifr->ifr_flags & IFF_NOARP){
1184
if(debug){
1185
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1186
ifname);
1187
}
1188
return false;
1189
}
1190
1191
/* Accept this device */
1192
if(debug){
1193
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1194
}
1195
return true;
1196
}
1197
1198
/*
1199
* This function determines if a directory entry in /sys/class/net
1200
* corresponds to an acceptable network device.
1201
* (This function is passed to scandir(3) as a filter function.)
1202
*/
1203
int good_interface(const struct dirent *if_entry){
1204
if(if_entry->d_name[0] == '.'){
1205
return 0;
1206
}
1207
1208
struct ifreq ifr;
1209
if(not get_flags(if_entry->d_name, &ifr)){
1210
if(debug){
1211
fprintf_plus(stderr, "Failed to get flags for interface "
1212
"\"%s\"\n", if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a network interface is up.
1225
*/
1226
bool interface_is_up(const char *interface){
1227
struct ifreq ifr;
1228
if(not get_flags(interface, &ifr)){
1229
if(debug){
1230
fprintf_plus(stderr, "Failed to get flags for interface "
1231
"\"%s\"\n", interface);
1232
}
1233
return false;
1234
}
1235
1236
return (bool)(ifr.ifr_flags & IFF_UP);
1237
}
1238
1239
/*
1240
* This function determines if a network interface is running
1241
*/
1242
bool interface_is_running(const char *interface){
1243
struct ifreq ifr;
1244
if(not get_flags(interface, &ifr)){
1245
if(debug){
1246
fprintf_plus(stderr, "Failed to get flags for interface "
1247
"\"%s\"\n", interface);
1248
}
1249
return false;
1250
}
1251
1252
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1253
}
1254
1255
int notdotentries(const struct dirent *direntry){
1256
/* Skip "." and ".." */
1257
if(direntry->d_name[0] == '.'
1258
and (direntry->d_name[1] == '\0'
1259
or (direntry->d_name[1] == '.'
1260
and direntry->d_name[2] == '\0'))){
1261
return 0;
1262
}
1263
return 1;
1264
}
1265
1266
/* Is this directory entry a runnable program? */
1267
int runnable_hook(const struct dirent *direntry){
1268
int ret;
1269
size_t sret;
1270
struct stat st;
1271
1272
if((direntry->d_name)[0] == '\0'){
1273
/* Empty name? */
1274
return 0;
1275
}
1276
1277
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1278
"abcdefghijklmnopqrstuvwxyz"
1279
"0123456789"
1280
"_-");
1281
if((direntry->d_name)[sret] != '\0'){
1282
/* Contains non-allowed characters */
1283
if(debug){
1284
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1285
direntry->d_name);
1286
}
1287
return 0;
1288
}
1289
1290
char *fullname = NULL;
1291
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1292
if(ret < 0){
1293
perror_plus("asprintf");
1294
return 0;
1295
}
1296
1297
ret = stat(fullname, &st);
1298
if(ret == -1){
1299
if(debug){
1300
perror_plus("Could not stat hook");
1301
}
1302
return 0;
1303
}
1304
if(not (S_ISREG(st.st_mode))){
1305
/* Not a regular file */
1306
if(debug){
1307
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1308
direntry->d_name);
1309
}
1310
return 0;
1311
}
1312
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1313
/* Not executable */
1314
if(debug){
1315
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1316
direntry->d_name);
1317
}
1318
return 0;
1319
}
1320
if(debug){
1321
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1322
direntry->d_name);
1323
}
1324
return 1;
1325
}
1326
1327
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1328
mandos_context *mc){
1329
int ret;
1330
struct timespec now;
1331
struct timespec waited_time;
1332
intmax_t block_time;
1333
1334
while(true){
1335
if(mc->current_server == NULL){
1336
if (debug){
1337
fprintf_plus(stderr, "Wait until first server is found."
1338
" No timeout!\n");
1339
}
1340
ret = avahi_simple_poll_iterate(s, -1);
1341
} else {
1342
if (debug){
1343
fprintf_plus(stderr, "Check current_server if we should run"
1344
" it, or wait\n");
1345
}
1346
/* the current time */
1347
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1348
if(ret == -1){
1349
perror_plus("clock_gettime");
1350
return -1;
1351
}
1352
/* Calculating in ms how long time between now and server
1353
who we visted longest time ago. Now - last seen. */
1354
waited_time.tv_sec = (now.tv_sec
1355
- mc->current_server->last_seen.tv_sec);
1356
waited_time.tv_nsec = (now.tv_nsec
1357
- mc->current_server->last_seen.tv_nsec);
1358
/* total time is 10s/10,000ms.
1359
Converting to s from ms by dividing by 1,000,
1360
and ns to ms by dividing by 1,000,000. */
1361
block_time = ((retry_interval
1362
- ((intmax_t)waited_time.tv_sec * 1000))
1363
- ((intmax_t)waited_time.tv_nsec / 1000000));
1364
1365
if (debug){
1366
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1367
block_time);
1368
}
1369
1370
if(block_time <= 0){
1371
ret = start_mandos_communication(mc->current_server->ip,
1372
mc->current_server->port,
1373
mc->current_server->if_index,
1374
mc->current_server->af, mc);
1375
if(ret == 0){
1376
avahi_simple_poll_quit(s);
1377
return 0;
1378
}
1379
ret = clock_gettime(CLOCK_MONOTONIC,
1380
&mc->current_server->last_seen);
1381
if(ret == -1){
1382
perror_plus("clock_gettime");
1383
return -1;
1384
}
1385
mc->current_server = mc->current_server->next;
1386
block_time = 0; /* Call avahi to find new Mandos
1387
servers, but don't block */
1388
}
1389
1390
ret = avahi_simple_poll_iterate(s, (int)block_time);
1391
}
1392
if(ret != 0){
1393
if (ret > 0 or errno != EINTR){
1394
return (ret != 1) ? ret : 0;
1395
}
1396
}
1397
}
1398
}
1399
1400
/* Set effective uid to 0, return errno */
1401
error_t raise_privileges(void){
1402
error_t old_errno = errno;
1403
error_t ret_errno = 0;
1404
if(seteuid(0) == -1){
1405
ret_errno = errno;
1406
perror_plus("seteuid");
1407
}
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
1412
/* Set effective and real user ID to 0. Return errno. */
1413
error_t raise_privileges_permanently(void){
1414
error_t old_errno = errno;
1415
error_t ret_errno = raise_privileges();
1416
if(ret_errno != 0){
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
if(setuid(0) == -1){
1421
ret_errno = errno;
1422
perror_plus("seteuid");
1423
}
1424
errno = old_errno;
1425
return ret_errno;
1426
}
1427
1428
/* Set effective user ID to unprivileged saved user ID */
1429
error_t lower_privileges(void){
1430
error_t old_errno = errno;
1431
error_t ret_errno = 0;
1432
if(seteuid(uid) == -1){
1433
ret_errno = errno;
1434
perror_plus("seteuid");
1435
}
1436
errno = old_errno;
1437
return ret_errno;
1438
}
1439
1440
/* Lower privileges permanently */
1441
error_t lower_privileges_permanently(void){
1442
error_t old_errno = errno;
1443
error_t ret_errno = 0;
1444
if(setuid(uid) == -1){
1445
ret_errno = errno;
1446
perror_plus("setuid");
1447
}
1448
errno = old_errno;
1449
return ret_errno;
1450
}
1451
1452
bool run_network_hooks(const char *mode, const char *interface,
1453
const float delay){
1454
struct dirent **direntries;
1455
struct dirent *direntry;
1456
int ret;
1457
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1458
alphasort);
1459
if(numhooks == -1){
1460
if(errno == ENOENT){
1461
if(debug){
1462
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1463
" found\n", hookdir);
1464
}
1465
} else {
1466
perror_plus("scandir");
1467
}
1468
} else {
1469
int devnull = open("/dev/null", O_RDONLY);
1470
for(int i = 0; i < numhooks; i++){
1471
direntry = direntries[i];
1472
char *fullname = NULL;
1473
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1474
if(ret < 0){
1475
perror_plus("asprintf");
1476
continue;
1477
}
1478
if(debug){
1479
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1480
direntry->d_name);
1481
}
1482
pid_t hook_pid = fork();
1483
if(hook_pid == 0){
1484
/* Child */
1485
/* Raise privileges */
1486
raise_privileges_permanently();
1487
/* Set group */
1488
errno = 0;
1489
ret = setgid(0);
1490
if(ret == -1){
1491
perror_plus("setgid");
1492
}
1493
/* Reset supplementary groups */
1494
errno = 0;
1495
ret = setgroups(0, NULL);
1496
if(ret == -1){
1497
perror_plus("setgroups");
1498
}
1499
dup2(devnull, STDIN_FILENO);
1500
close(devnull);
1501
dup2(STDERR_FILENO, STDOUT_FILENO);
1502
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1503
if(ret == -1){
1504
perror_plus("setenv");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DEVICE", interface, 1);
1508
if(ret == -1){
1509
perror_plus("setenv");
1510
_exit(EX_OSERR);
1511
}
1512
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1513
if(ret == -1){
1514
perror_plus("setenv");
1515
_exit(EX_OSERR);
1516
}
1517
ret = setenv("MODE", mode, 1);
1518
if(ret == -1){
1519
perror_plus("setenv");
1520
_exit(EX_OSERR);
1521
}
1522
char *delaystring;
1523
ret = asprintf(&delaystring, "%f", delay);
1524
if(ret == -1){
1525
perror_plus("asprintf");
1526
_exit(EX_OSERR);
1527
}
1528
ret = setenv("DELAY", delaystring, 1);
1529
if(ret == -1){
1530
free(delaystring);
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
free(delaystring);
1535
if(connect_to != NULL){
1536
ret = setenv("CONNECT", connect_to, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
}
1542
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1543
perror_plus("execl");
1544
_exit(EXIT_FAILURE);
1545
}
1546
} else {
1547
int status;
1548
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1549
perror_plus("waitpid");
1550
free(fullname);
1551
continue;
1552
}
1553
if(WIFEXITED(status)){
1554
if(WEXITSTATUS(status) != 0){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1556
" with status %d\n", direntry->d_name,
1557
WEXITSTATUS(status));
1558
free(fullname);
1559
continue;
1560
}
1561
} else if(WIFSIGNALED(status)){
1562
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1563
" signal %d\n", direntry->d_name,
1564
WTERMSIG(status));
1565
free(fullname);
1566
continue;
1567
} else {
1568
fprintf_plus(stderr, "Warning: network hook \"%s\""
1569
" crashed\n", direntry->d_name);
1570
free(fullname);
1571
continue;
1572
}
1573
}
1574
free(fullname);
1575
if(debug){
1576
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1577
direntry->d_name);
1578
}
1579
}
1580
close(devnull);
1581
}
1582
return true;
1583
}
1584
1585
error_t bring_up_interface(const char *const interface,
1586
const float delay){
1587
int sd = -1;
1588
error_t old_errno = errno;
1589
error_t ret_errno = 0;
1590
int ret, ret_setflags;
1591
struct ifreq network;
1592
unsigned int if_index = if_nametoindex(interface);
1593
if(if_index == 0){
1594
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1595
errno = old_errno;
1596
return ENXIO;
1597
}
1598
1599
if(quit_now){
1600
errno = old_errno;
1601
return EINTR;
1602
}
1603
1604
if(not interface_is_up(interface)){
1605
if(not get_flags(interface, &network) and debug){
1606
ret_errno = errno;
1607
fprintf_plus(stderr, "Failed to get flags for interface "
1608
"\"%s\"\n", interface);
1609
return ret_errno;
1610
}
1611
network.ifr_flags |= IFF_UP;
1612
1613
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1614
if(sd < 0){
1615
ret_errno = errno;
1616
perror_plus("socket");
1617
errno = old_errno;
1618
return ret_errno;
1619
}
1620
1621
if(quit_now){
1622
close(sd);
1623
errno = old_errno;
1624
return EINTR;
1625
}
1626
1627
if(debug){
1628
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1629
interface);
1630
}
1631
1632
/* Raise priviliges */
1633
raise_privileges();
1634
1635
#ifdef __linux__
1636
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1637
messages about the network interface to mess up the prompt */
1638
int ret_linux = klogctl(8, NULL, 5);
1639
bool restore_loglevel = true;
1640
if(ret_linux == -1){
1641
restore_loglevel = false;
1642
perror_plus("klogctl");
1643
}
1644
#endif /* __linux__ */
1645
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1646
ret_errno = errno;
1647
#ifdef __linux__
1648
if(restore_loglevel){
1649
ret_linux = klogctl(7, NULL, 0);
1650
if(ret_linux == -1){
1651
perror_plus("klogctl");
1652
}
1653
}
1654
#endif /* __linux__ */
1655
1656
/* Lower privileges */
1657
lower_privileges();
1658
1659
/* Close the socket */
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1661
if(ret == -1){
1662
perror_plus("close");
1663
}
1664
1665
if(ret_setflags == -1){
1666
errno = ret_errno;
1667
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1668
errno = old_errno;
1669
return ret_errno;
1670
}
1671
} else if(debug){
1672
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1673
interface);
1674
}
1675
1676
/* Sleep checking until interface is running.
1677
Check every 0.25s, up to total time of delay */
1678
for(int i=0; i < delay * 4; i++){
1679
if(interface_is_running(interface)){
1680
break;
1681
}
1682
struct timespec sleeptime = { .tv_nsec = 250000000 };
1683
ret = nanosleep(&sleeptime, NULL);
1684
if(ret == -1 and errno != EINTR){
1685
perror_plus("nanosleep");
1686
}
1687
}
1688
1689
errno = old_errno;
1690
return 0;
1691
}
1692
1693
error_t take_down_interface(const char *const interface){
1694
int sd = -1;
1695
error_t old_errno = errno;
1696
error_t ret_errno = 0;
1697
int ret, ret_setflags;
1698
struct ifreq network;
1699
unsigned int if_index = if_nametoindex(interface);
1700
if(if_index == 0){
1701
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1702
errno = old_errno;
1703
return ENXIO;
1704
}
1705
if(interface_is_up(interface)){
1706
if(not get_flags(interface, &network) and debug){
1707
ret_errno = errno;
1708
fprintf_plus(stderr, "Failed to get flags for interface "
1709
"\"%s\"\n", interface);
1710
return ret_errno;
1711
}
1712
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1713
1714
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1715
if(sd < 0){
1716
ret_errno = errno;
1717
perror_plus("socket");
1718
errno = old_errno;
1719
return ret_errno;
1720
}
1721
1722
if(debug){
1723
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1724
interface);
1725
}
1726
1727
/* Raise priviliges */
1728
raise_privileges();
1729
1730
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1731
ret_errno = errno;
1732
1733
/* Lower privileges */
1734
lower_privileges();
1735
1736
/* Close the socket */
1737
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1738
if(ret == -1){
1739
perror_plus("close");
1740
}
1741
1742
if(ret_setflags == -1){
1743
errno = ret_errno;
1744
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1745
errno = old_errno;
1746
return ret_errno;
1747
}
1748
} else if(debug){
1749
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1750
interface);
1751
}
1752
1753
errno = old_errno;
1754
return 0;
1755
}
1756
813
1757
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;
1758
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1759
.priority = "SECURE256:!CTYPE-X.509:"
1760
"+CTYPE-OPENPGP", .current_server = NULL,
1761
.interfaces = NULL, .interfaces_size = 0 };
1762
AvahiSServiceBrowser *sb = NULL;
1763
error_t ret_errno;
1764
int ret;
1765
intmax_t tmpmax;
1766
char *tmp;
1767
int exitcode = EXIT_SUCCESS;
1768
char *interfaces_to_take_down = NULL;
1769
size_t interfaces_to_take_down_size = 0;
1770
char tempdir[] = "/tmp/mandosXXXXXX";
1771
bool tempdir_created = false;
1772
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1773
const char *seckey = PATHDIR "/" SECKEY;
1774
const char *pubkey = PATHDIR "/" PUBKEY;
1775
char *interfaces_hooks = NULL;
1776
size_t interfaces_hooks_size = 0;
1777
1778
bool gnutls_initialized = false;
1779
bool gpgme_initialized = false;
1780
float delay = 2.5f;
1781
double retry_interval = 10; /* 10s between trying a server and
1782
retrying the same server again */
1783
1784
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1785
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1786
1787
uid = getuid();
1788
gid = getgid();
1789
1790
/* Lower any group privileges we might have, just to be safe */
1791
errno = 0;
1792
ret = setgid(gid);
1793
if(ret == -1){
1794
perror_plus("setgid");
1795
}
1796
1797
/* Lower user privileges (temporarily) */
1798
errno = 0;
1799
ret = seteuid(uid);
1800
if(ret == -1){
1801
perror_plus("seteuid");
1802
}
1803
1804
if(quit_now){
1805
goto end;
1806
}
1807
1808
{
1809
struct argp_option options[] = {
1810
{ .name = "debug", .key = 128,
1811
.doc = "Debug mode", .group = 3 },
1812
{ .name = "connect", .key = 'c',
1813
.arg = "ADDRESS:PORT",
1814
.doc = "Connect directly to a specific Mandos server",
1815
.group = 1 },
1816
{ .name = "interface", .key = 'i',
1817
.arg = "NAME",
1818
.doc = "Network interface that will be used to search for"
1819
" Mandos servers",
1820
.group = 1 },
1821
{ .name = "seckey", .key = 's',
1822
.arg = "FILE",
1823
.doc = "OpenPGP secret key file base name",
1824
.group = 1 },
1825
{ .name = "pubkey", .key = 'p',
1826
.arg = "FILE",
1827
.doc = "OpenPGP public key file base name",
1828
.group = 2 },
1829
{ .name = "dh-bits", .key = 129,
1830
.arg = "BITS",
1831
.doc = "Bit length of the prime number used in the"
1832
" Diffie-Hellman key exchange",
1833
.group = 2 },
1834
{ .name = "priority", .key = 130,
1835
.arg = "STRING",
1836
.doc = "GnuTLS priority string for the TLS handshake",
1837
.group = 1 },
1838
{ .name = "delay", .key = 131,
1839
.arg = "SECONDS",
1840
.doc = "Maximum delay to wait for interface startup",
1841
.group = 2 },
1842
{ .name = "retry", .key = 132,
1843
.arg = "SECONDS",
1844
.doc = "Retry interval used when denied by the Mandos server",
1845
.group = 2 },
1846
{ .name = "network-hook-dir", .key = 133,
1847
.arg = "DIR",
1848
.doc = "Directory where network hooks are located",
1849
.group = 2 },
1850
/*
1851
* These reproduce what we would get without ARGP_NO_HELP
1852
*/
1853
{ .name = "help", .key = '?',
1854
.doc = "Give this help list", .group = -1 },
1855
{ .name = "usage", .key = -3,
1856
.doc = "Give a short usage message", .group = -1 },
1857
{ .name = "version", .key = 'V',
1858
.doc = "Print program version", .group = -1 },
1859
{ .name = NULL }
1860
};
1861
1862
error_t parse_opt(int key, char *arg,
1863
struct argp_state *state){
1864
errno = 0;
1865
switch(key){
1866
case 128: /* --debug */
1867
debug = true;
1868
break;
1869
case 'c': /* --connect */
1870
connect_to = arg;
1871
break;
1872
case 'i': /* --interface */
1873
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1874
arg, (int)',');
1875
if(ret_errno != 0){
1876
argp_error(state, "%s", strerror(ret_errno));
1877
}
1878
break;
1879
case 's': /* --seckey */
1880
seckey = arg;
1881
break;
1882
case 'p': /* --pubkey */
1883
pubkey = arg;
1884
break;
1885
case 129: /* --dh-bits */
1886
errno = 0;
1887
tmpmax = strtoimax(arg, &tmp, 10);
1888
if(errno != 0 or tmp == arg or *tmp != '\0'
1889
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1890
argp_error(state, "Bad number of DH bits");
1891
}
1892
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1893
break;
1894
case 130: /* --priority */
1895
mc.priority = arg;
1896
break;
1897
case 131: /* --delay */
1898
errno = 0;
1899
delay = strtof(arg, &tmp);
1900
if(errno != 0 or tmp == arg or *tmp != '\0'){
1901
argp_error(state, "Bad delay");
1902
}
1903
case 132: /* --retry */
1904
errno = 0;
1905
retry_interval = strtod(arg, &tmp);
1906
if(errno != 0 or tmp == arg or *tmp != '\0'
1907
or (retry_interval * 1000) > INT_MAX
1908
or retry_interval < 0){
1909
argp_error(state, "Bad retry interval");
1910
}
1911
break;
1912
case 133: /* --network-hook-dir */
1913
hookdir = arg;
1914
break;
1915
/*
1916
* These reproduce what we would get without ARGP_NO_HELP
1917
*/
1918
case '?': /* --help */
1919
argp_state_help(state, state->out_stream,
1920
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1921
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1922
case -3: /* --usage */
1923
argp_state_help(state, state->out_stream,
1924
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1925
case 'V': /* --version */
1926
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1927
exit(argp_err_exit_status);
1928
break;
1929
default:
1930
return ARGP_ERR_UNKNOWN;
1931
}
1932
return errno;
1933
}
1934
1935
struct argp argp = { .options = options, .parser = parse_opt,
1936
.args_doc = "",
1937
.doc = "Mandos client -- Get and decrypt"
1938
" passwords from a Mandos server" };
1939
ret = argp_parse(&argp, argc, argv,
1940
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1941
switch(ret){
1942
case 0:
1943
break;
1944
case ENOMEM:
1945
default:
1946
errno = ret;
1947
perror_plus("argp_parse");
1948
exitcode = EX_OSERR;
1949
goto end;
1950
case EINVAL:
1951
exitcode = EX_USAGE;
1952
goto end;
1953
}
1954
}
1955
1956
{
1957
/* Work around Debian bug #633582:
1958
<http://bugs.debian.org/633582> */
1959
1960
/* Re-raise priviliges */
1961
if(raise_privileges() == 0){
1962
struct stat st;
1963
1964
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1965
int seckey_fd = open(seckey, O_RDONLY);
1966
if(seckey_fd == -1){
1967
perror_plus("open");
1968
} else {
1969
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1970
if(ret == -1){
1971
perror_plus("fstat");
1972
} else {
1973
if(S_ISREG(st.st_mode)
1974
and st.st_uid == 0 and st.st_gid == 0){
1975
ret = fchown(seckey_fd, uid, gid);
1976
if(ret == -1){
1977
perror_plus("fchown");
1978
}
1979
}
1980
}
1981
TEMP_FAILURE_RETRY(close(seckey_fd));
1982
}
1983
}
1984
1985
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1986
int pubkey_fd = open(pubkey, O_RDONLY);
1987
if(pubkey_fd == -1){
1988
perror_plus("open");
1989
} else {
1990
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1991
if(ret == -1){
1992
perror_plus("fstat");
1993
} else {
1994
if(S_ISREG(st.st_mode)
1995
and st.st_uid == 0 and st.st_gid == 0){
1996
ret = fchown(pubkey_fd, uid, gid);
1997
if(ret == -1){
1998
perror_plus("fchown");
1999
}
2000
}
2001
}
2002
TEMP_FAILURE_RETRY(close(pubkey_fd));
2003
}
2004
}
2005
2006
/* Lower privileges */
2007
errno = 0;
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2011
}
2012
}
2013
}
2014
2015
/* Remove empty interface names */
2016
{
2017
char *interface = NULL;
2018
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2019
interface))){
2020
if(if_nametoindex(interface) == 0){
2021
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2022
fprintf_plus(stderr, "Not using nonexisting interface"
2023
" \"%s\"\n", interface);
2024
}
2025
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2026
interface = NULL;
2027
}
2028
}
2029
}
2030
2031
/* Run network hooks */
2032
{
2033
2034
if(mc.interfaces != NULL){
2035
interfaces_hooks = malloc(mc.interfaces_size);
2036
if(interfaces_hooks == NULL){
2037
perror_plus("malloc");
917
2038
goto end;
918
2039
}
919
}
920
921
ret = init_gnutls_global(&mc, pubkey, seckey);
922
if (ret == -1){
923
fprintf(stderr, "init_gnutls_global failed\n");
2040
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2041
interfaces_hooks_size = mc.interfaces_size;
2042
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2043
(int)',');
2044
}
2045
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2046
interfaces_hooks : "", delay)){
2047
goto end;
2048
}
2049
}
2050
2051
if(not debug){
2052
avahi_set_log_function(empty_log);
2053
}
2054
2055
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2056
from the signal handler */
2057
/* Initialize the pseudo-RNG for Avahi */
2058
srand((unsigned int) time(NULL));
2059
simple_poll = avahi_simple_poll_new();
2060
if(simple_poll == NULL){
2061
fprintf_plus(stderr,
2062
"Avahi: Failed to create simple poll object.\n");
2063
exitcode = EX_UNAVAILABLE;
2064
goto end;
2065
}
2066
2067
sigemptyset(&sigterm_action.sa_mask);
2068
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2069
if(ret == -1){
2070
perror_plus("sigaddset");
2071
exitcode = EX_OSERR;
2072
goto end;
2073
}
2074
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2075
if(ret == -1){
2076
perror_plus("sigaddset");
2077
exitcode = EX_OSERR;
2078
goto end;
2079
}
2080
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2081
if(ret == -1){
2082
perror_plus("sigaddset");
2083
exitcode = EX_OSERR;
2084
goto end;
2085
}
2086
/* Need to check if the handler is SIG_IGN before handling:
2087
| [[info:libc:Initial Signal Actions]] |
2088
| [[info:libc:Basic Signal Handling]] |
2089
*/
2090
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2091
if(ret == -1){
2092
perror_plus("sigaction");
2093
return EX_OSERR;
2094
}
2095
if(old_sigterm_action.sa_handler != SIG_IGN){
2096
ret = sigaction(SIGINT, &sigterm_action, NULL);
2097
if(ret == -1){
2098
perror_plus("sigaction");
2099
exitcode = EX_OSERR;
2100
goto end;
2101
}
2102
}
2103
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2104
if(ret == -1){
2105
perror_plus("sigaction");
2106
return EX_OSERR;
2107
}
2108
if(old_sigterm_action.sa_handler != SIG_IGN){
2109
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2110
if(ret == -1){
2111
perror_plus("sigaction");
2112
exitcode = EX_OSERR;
2113
goto end;
2114
}
2115
}
2116
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2117
if(ret == -1){
2118
perror_plus("sigaction");
2119
return EX_OSERR;
2120
}
2121
if(old_sigterm_action.sa_handler != SIG_IGN){
2122
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2123
if(ret == -1){
2124
perror_plus("sigaction");
2125
exitcode = EX_OSERR;
2126
goto end;
2127
}
2128
}
2129
2130
/* If no interfaces were specified, make a list */
2131
if(mc.interfaces == NULL){
2132
struct dirent **direntries;
2133
/* Look for any good interfaces */
2134
ret = scandir(sys_class_net, &direntries, good_interface,
2135
alphasort);
2136
if(ret >= 1){
2137
/* Add all found interfaces to interfaces list */
2138
for(int i = 0; i < ret; ++i){
2139
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2140
direntries[i]->d_name);
2141
if(ret_errno != 0){
2142
perror_plus("argz_add");
2143
continue;
2144
}
2145
if(debug){
2146
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2147
direntries[i]->d_name);
2148
}
2149
}
2150
free(direntries);
2151
} else {
2152
free(direntries);
2153
fprintf_plus(stderr, "Could not find a network interface\n");
924
2154
exitcode = EXIT_FAILURE;
925
2155
goto end;
2156
}
2157
}
2158
2159
/* If we only got one interface, explicitly use only that one */
2160
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2161
if(debug){
2162
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2163
mc.interfaces);
2164
}
2165
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2166
}
2167
2168
/* Bring up interfaces which are down */
2169
if(not (argz_count(mc.interfaces, mc.interfaces_size) == 1
2170
and strcmp(mc.interfaces, "none") == 0)){
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2173
interface))){
2174
bool interface_was_up = interface_is_up(interface);
2175
ret = bring_up_interface(interface, delay);
2176
if(not interface_was_up){
2177
if(ret != 0){
2178
errno = ret;
2179
perror_plus("Failed to bring up interface");
2180
} else {
2181
ret_errno = argz_add(&interfaces_to_take_down,
2182
&interfaces_to_take_down_size,
2183
interface);
2184
}
2185
}
2186
}
2187
free(mc.interfaces);
2188
mc.interfaces = NULL;
2189
mc.interfaces_size = 0;
2190
if(debug and (interfaces_to_take_down == NULL)){
2191
fprintf_plus(stderr, "No interfaces were brought up\n");
2192
}
2193
}
2194
2195
if(quit_now){
2196
goto end;
2197
}
2198
2199
ret = init_gnutls_global(pubkey, seckey, &mc);
2200
if(ret == -1){
2201
fprintf_plus(stderr, "init_gnutls_global failed\n");
2202
exitcode = EX_UNAVAILABLE;
2203
goto end;
2204
} else {
2205
gnutls_initialized = true;
2206
}
2207
2208
if(quit_now){
2209
goto end;
2210
}
2211
2212
if(mkdtemp(tempdir) == NULL){
2213
perror_plus("mkdtemp");
2214
goto end;
2215
}
2216
tempdir_created = true;
2217
2218
if(quit_now){
2219
goto end;
2220
}
2221
2222
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2223
fprintf_plus(stderr, "init_gpgme failed\n");
2224
exitcode = EX_UNAVAILABLE;
2225
goto end;
2226
} else {
2227
gpgme_initialized = true;
2228
}
2229
2230
if(quit_now){
2231
goto end;
2232
}
2233
2234
if(connect_to != NULL){
2235
/* Connect directly, do not use Zeroconf */
2236
/* (Mainly meant for debugging) */
2237
char *address = strrchr(connect_to, ':');
2238
2239
if(address == NULL){
2240
fprintf_plus(stderr, "No colon in address\n");
2241
exitcode = EX_USAGE;
2242
goto end;
2243
}
2244
2245
if(quit_now){
2246
goto end;
2247
}
2248
2249
in_port_t port;
2250
errno = 0;
2251
tmpmax = strtoimax(address+1, &tmp, 10);
2252
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2253
or tmpmax != (in_port_t)tmpmax){
2254
fprintf_plus(stderr, "Bad port number\n");
2255
exitcode = EX_USAGE;
2256
goto end;
2257
}
2258
2259
if(quit_now){
2260
goto end;
2261
}
2262
2263
port = (in_port_t)tmpmax;
2264
*address = '\0';
2265
/* Colon in address indicates IPv6 */
2266
int af;
2267
if(strchr(connect_to, ':') != NULL){
2268
af = AF_INET6;
2269
/* Accept [] around IPv6 address - see RFC 5952 */
2270
if(connect_to[0] == '[' and address[-1] == ']')
2271
{
2272
connect_to++;
2273
address[-1] = '\0';
2274
}
926
2275
} else {
927
gnutls_initalized = true;
928
}
2276
af = AF_INET;
2277
}
2278
address = connect_to;
2279
2280
if(quit_now){
2281
goto end;
2282
}
2283
2284
while(not quit_now){
2285
ret = start_mandos_communication(address, port, if_index, af,
2286
&mc);
2287
if(quit_now or ret == 0){
2288
break;
2289
}
2290
if(debug){
2291
fprintf_plus(stderr, "Retrying in %d seconds\n",
2292
(int)retry_interval);
2293
}
2294
sleep((int)retry_interval);
2295
}
2296
2297
if (not quit_now){
2298
exitcode = EXIT_SUCCESS;
2299
}
2300
2301
goto end;
2302
}
2303
2304
if(quit_now){
2305
goto end;
2306
}
2307
2308
{
2309
AvahiServerConfig config;
2310
/* Do not publish any local Zeroconf records */
2311
avahi_server_config_init(&config);
2312
config.publish_hinfo = 0;
2313
config.publish_addresses = 0;
2314
config.publish_workstation = 0;
2315
config.publish_domain = 0;
2316
2317
/* Allocate a new server */
2318
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2319
&config, NULL, NULL, &ret_errno);
2320
2321
/* Free the Avahi configuration data */
2322
avahi_server_config_free(&config);
2323
}
2324
2325
/* Check if creating the Avahi server object succeeded */
2326
if(mc.server == NULL){
2327
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2328
avahi_strerror(ret_errno));
2329
exitcode = EX_UNAVAILABLE;
2330
goto end;
2331
}
2332
2333
if(quit_now){
2334
goto end;
2335
}
2336
2337
/* Create the Avahi service browser */
2338
sb = avahi_s_service_browser_new(mc.server, if_index,
2339
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2340
NULL, 0, browse_callback,
2341
(void *)&mc);
2342
if(sb == NULL){
2343
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2344
avahi_strerror(avahi_server_errno(mc.server)));
2345
exitcode = EX_UNAVAILABLE;
2346
goto end;
2347
}
2348
2349
if(quit_now){
2350
goto end;
2351
}
2352
2353
/* Run the main loop */
2354
2355
if(debug){
2356
fprintf_plus(stderr, "Starting Avahi loop search\n");
2357
}
929
2358
930
if(mkdtemp(tempdir) == NULL){
931
perror("mkdtemp");
932
tempdir[0] = '\0';
933
goto end;
934
}
935
936
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
937
fprintf(stderr, "pgpme_initalized failed\n");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
} else {
941
pgpme_initalized = true;
942
}
943
944
/* If the interface is down, bring it up */
945
{
946
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
947
if(sd < 0) {
948
perror("socket");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
strcpy(network.ifr_name, interface);
953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
954
if(ret == -1){
955
perror("ioctl SIOCGIFFLAGS");
956
exitcode = EXIT_FAILURE;
957
goto end;
958
}
959
if((network.ifr_flags & IFF_UP) == 0){
960
network.ifr_flags |= IFF_UP;
961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
962
if(ret == -1){
963
perror("ioctl SIOCSIFFLAGS");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
}
967
}
968
ret = TEMP_FAILURE_RETRY(close(sd));
969
if(ret == -1){
970
perror("close");
971
}
972
}
973
974
uid = getuid();
975
gid = getgid();
976
977
ret = setuid(uid);
978
if (ret == -1){
979
perror("setuid");
980
}
981
982
setgid(gid);
983
if (ret == -1){
984
perror("setgid");
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
}
1002
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;
1007
goto end;
1008
}
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
2359
ret = avahi_loop_with_timeout(simple_poll,
2360
(int)(retry_interval * 1000), &mc);
2361
if(debug){
2362
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2363
(ret == 0) ? "successfully" : "with error");
2364
}
2365
1082
2366
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;
2367
2368
if(debug){
2369
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2370
}
2371
2372
/* Cleanup things */
2373
if(sb != NULL)
2374
avahi_s_service_browser_free(sb);
2375
2376
if(mc.server != NULL)
2377
avahi_server_free(mc.server);
2378
2379
if(simple_poll != NULL)
2380
avahi_simple_poll_free(simple_poll);
2381
2382
if(gnutls_initialized){
2383
gnutls_certificate_free_credentials(mc.cred);
2384
gnutls_global_deinit();
2385
gnutls_dh_params_deinit(mc.dh_params);
2386
}
2387
2388
if(gpgme_initialized){
2389
gpgme_release(mc.ctx);
2390
}
2391
2392
/* Cleans up the circular linked list of Mandos servers the client
2393
has seen */
2394
if(mc.current_server != NULL){
2395
mc.current_server->prev->next = NULL;
2396
while(mc.current_server != NULL){
2397
server *next = mc.current_server->next;
2398
free(mc.current_server);
2399
mc.current_server = next;
2400
}
2401
}
2402
2403
/* Re-raise priviliges */
2404
{
2405
raise_privileges();
2406
2407
/* Run network hooks */
2408
run_network_hooks("stop", interfaces_hooks != NULL ?
2409
interfaces_hooks : "", delay);
2410
2411
/* Take down the network interfaces which were brought up */
2412
{
2413
char *interface = NULL;
2414
while((interface=argz_next(interfaces_to_take_down,
2415
interfaces_to_take_down_size,
2416
interface))){
2417
ret_errno = take_down_interface(interface);
2418
if(ret_errno != 0){
2419
errno = ret_errno;
2420
perror_plus("Failed to take down interface");
2421
}
2422
}
2423
if(debug and (interfaces_to_take_down == NULL)){
2424
fprintf_plus(stderr, "No interfaces needed to be taken"
2425
" down\n");
2426
}
2427
}
2428
2429
lower_privileges_permanently();
2430
}
2431
2432
free(interfaces_to_take_down);
2433
free(interfaces_hooks);
2434
2435
/* Removes the GPGME temp directory and all files inside */
2436
if(tempdir_created){
2437
struct dirent **direntries = NULL;
2438
struct dirent *direntry = NULL;
2439
int numentries = scandir(tempdir, &direntries, notdotentries,
2440
alphasort);
2441
if (numentries > 0){
2442
for(int i = 0; i < numentries; i++){
2443
direntry = direntries[i];
2444
char *fullname = NULL;
2445
ret = asprintf(&fullname, "%s/%s", tempdir,
2446
direntry->d_name);
2447
if(ret < 0){
2448
perror_plus("asprintf");
2449
continue;
2450
}
2451
ret = remove(fullname);
2452
if(ret == -1){
2453
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2454
strerror(errno));
2455
}
2456
free(fullname);
2457
}
2458
}
2459
2460
/* need to clean even if 0 because man page doesn't specify */
2461
free(direntries);
2462
if (numentries == -1){
2463
perror_plus("scandir");
2464
}
2465
ret = rmdir(tempdir);
2466
if(ret == -1 and errno != ENOENT){
2467
perror_plus("rmdir");
2468
}
2469
}
2470
2471
if(quit_now){
2472
sigemptyset(&old_sigterm_action.sa_mask);
2473
old_sigterm_action.sa_handler = SIG_DFL;
2474
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2475
&old_sigterm_action,
2476
NULL));
2477
if(ret == -1){
2478
perror_plus("sigaction");
2479
}
2480
do {
2481
ret = raise(signal_received);
2482
} while(ret != 0 and errno == EINTR);
2483
if(ret != 0){
2484
perror_plus("raise");
2485
abort();
2486
}
2487
TEMP_FAILURE_RETRY(pause());
2488
}
2489
2490
return exitcode;
1144
2491
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0