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» Revision
24.1.19
(compared to revision 237.7.201)
: plugins.d/mandosclient.c
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- Committer: Björn Påhlsson
- Date: 2008-08-04 21:27:53 UTC
- mfrom: (45 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 46.
- Revision ID: belorn@braxen-20080804212753-rdghixnyfxb7w3u5
merge
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
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() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
67
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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 */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
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__ */
98
99
/* Avahi */
100
/* All Avahi types, constants and functions
101
Avahi*, avahi_*,
102
AVAHI_* */
45
SIOCSIFFLAGS */
46
103
47
#include <avahi-core/core.h>
104
48
#include <avahi-core/lookup.h>
105
49
#include <avahi-core/log.h>
107
51
#include <avahi-common/malloc.h>
108
52
#include <avahi-common/error.h>
109
53
110
/* GnuTLS */
111
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
112
functions:
113
gnutls_*
114
init_gnutls_session(),
115
GNUTLS_* */
116
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
119
60
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
120
71
/* GPGME */
121
#include <gpgme.h> /* All GPGME types, constants and
122
functions:
123
gpgme_*
124
GPGME_PROTOCOL_OpenPGP,
125
GPG_ERR_NO_* */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
126
74
127
75
#define BUFFER_SIZE 256
128
76
129
#define PATHDIR "/conf/conf.d/mandos"
130
#define SECKEY "seckey.txt"
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
134
77
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
135
79
static const char mandos_protocol_version[] = "1";
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;
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
154
82
155
83
/* Used for passing in values through the Avahi callback functions */
156
84
typedef struct {
85
AvahiSimplePoll *simple_poll;
157
86
AvahiServer *server;
158
87
gnutls_certificate_credentials_t cred;
159
88
unsigned int dh_bits;
160
89
gnutls_dh_params_t dh_params;
161
90
const char *priority;
162
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
91
} mandos_context;
167
92
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 (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
193
93
/*
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
* bytes. "buffer_capacity" is how much is currently allocated,
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
196
96
* "buffer_length" is how much is already used.
197
97
*/
198
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
99
size_t buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
201
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
102
if (buffer == NULL){
203
103
return 0;
204
104
}
205
105
buffer_capacity += BUFFER_SIZE;
207
107
return buffer_capacity;
208
108
}
209
109
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
}
246
247
110
/*
248
* Initialize GPGME.
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
249
113
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
size_t crypto_size,
116
char **plaintext,
117
const char *homedir){
118
gpgme_data_t dh_crypto, dh_plain;
119
gpgme_ctx_t ctx;
252
120
gpgme_error_t rc;
121
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
253
124
gpgme_engine_info_t engine_info;
254
125
255
/*
256
* Helper function to insert pub and seckey to the engine keyring.
257
*/
258
bool import_key(const char *filename){
259
int ret;
260
int fd;
261
gpgme_data_t pgp_data;
262
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
if(fd == -1){
265
perror_plus("open");
266
return false;
267
}
268
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
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));
273
return false;
274
}
275
276
rc = gpgme_op_import(mc->ctx, pgp_data);
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));
280
return false;
281
}
282
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
if(ret == -1){
285
perror_plus("close");
286
}
287
gpgme_data_release(pgp_data);
288
return true;
289
}
290
291
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
126
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
293
128
}
294
129
295
130
/* Init GPGME */
296
131
gpgme_check_version(NULL);
297
132
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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));
301
return false;
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
136
return -1;
302
137
}
303
138
304
139
/* 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));
309
return false;
140
rc = gpgme_get_engine_info (&engine_info);
141
if (rc != GPG_ERR_NO_ERROR){
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
143
gpgme_strsource(rc), gpgme_strerror(rc));
144
return -1;
310
145
}
311
146
while(engine_info != NULL){
312
147
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
313
148
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
314
engine_info->file_name, tempdir);
149
engine_info->file_name, homedir);
315
150
break;
316
151
}
317
152
engine_info = engine_info->next;
318
153
}
319
154
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
322
return false;
323
}
324
325
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
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;
339
}
340
341
/*
342
* Decrypt OpenPGP data.
343
* Returns -1 on error
344
*/
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
349
gpgme_data_t dh_crypto, dh_plain;
350
gpgme_error_t rc;
351
ssize_t ret;
352
size_t plaintext_capacity = 0;
353
ssize_t plaintext_length = 0;
354
355
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
156
return -1;
357
157
}
358
158
359
159
/* Create new GPGME data buffer from memory cryptotext */
360
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
161
0);
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));
162
if (rc != GPG_ERR_NO_ERROR){
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
gpgme_strsource(rc), gpgme_strerror(rc));
365
165
return -1;
366
166
}
367
167
368
168
/* Create new empty GPGME data buffer for the plaintext */
369
169
rc = gpgme_data_new(&dh_plain);
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));
170
if (rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
374
173
gpgme_data_release(dh_crypto);
375
174
return -1;
376
175
}
377
176
177
/* Create new GPGME "context" */
178
rc = gpgme_new(&ctx);
179
if (rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
184
}
185
378
186
/* Decrypt data from the cryptotext data buffer to the plaintext
379
187
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
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));
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
if (rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
384
192
plaintext_length = -1;
385
if(debug){
386
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
388
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
} else {
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);
395
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
397
}
398
gpgme_recipient_t recipient;
399
recipient = result->recipients;
193
goto decrypt_end;
194
}
195
196
if(debug){
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
198
}
199
200
if (debug){
201
gpgme_decrypt_result_t result;
202
result = gpgme_op_decrypt_result(ctx);
203
if (result == NULL){
204
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
205
} else {
206
fprintf(stderr, "Unsupported algorithm: %s\n",
207
result->unsupported_algorithm);
208
fprintf(stderr, "Wrong key usage: %d\n",
209
result->wrong_key_usage);
210
if(result->file_name != NULL){
211
fprintf(stderr, "File name: %s\n", result->file_name);
212
}
213
gpgme_recipient_t recipient;
214
recipient = result->recipients;
215
if(recipient){
400
216
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");
217
fprintf(stderr, "Public key algorithm: %s\n",
218
gpgme_pubkey_algo_name(recipient->pubkey_algo));
219
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
220
fprintf(stderr, "Secret key available: %s\n",
221
recipient->status == GPG_ERR_NO_SECKEY
222
? "No" : "Yes");
408
223
recipient = recipient->next;
409
224
}
410
225
}
411
226
}
412
goto decrypt_end;
413
}
414
415
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
417
227
}
418
228
419
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
422
232
plaintext_length = -1;
423
233
goto decrypt_end;
424
234
}
425
235
426
236
*plaintext = NULL;
427
237
while(true){
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;
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
240
plaintext_capacity);
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
244
goto decrypt_end;
435
245
}
436
246
437
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
438
248
BUFFER_SIZE);
439
249
/* Print the data, if any */
440
if(ret == 0){
250
if (ret == 0){
441
251
/* EOF */
442
252
break;
443
253
}
444
254
if(ret < 0){
445
perror_plus("gpgme_data_read");
255
perror("gpgme_data_read");
446
256
plaintext_length = -1;
447
257
goto decrypt_end;
448
258
}
449
259
plaintext_length += ret;
450
260
}
451
261
452
262
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
263
fprintf(stderr, "Decrypted password is: ");
454
264
for(ssize_t i = 0; i < plaintext_length; i++){
455
265
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
266
}
467
277
return plaintext_length;
468
278
}
469
279
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
280
static const char * safer_gnutls_strerror (int value) {
281
const char *ret = gnutls_strerror (value);
282
if (ret == NULL)
473
283
ret = "(unknown)";
474
284
return ret;
475
285
}
477
287
/* GnuTLS log function callback */
478
288
static void debuggnutls(__attribute__((unused)) int level,
479
289
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
290
fprintf(stderr, "GnuTLS: %s", string);
481
291
}
482
292
483
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
486
296
int ret;
487
297
488
298
if(debug){
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
299
fprintf(stderr, "Initializing GnuTLS\n");
490
300
}
491
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
301
302
if ((ret = gnutls_global_init ())
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
496
306
return -1;
497
307
}
498
308
499
if(debug){
309
if (debug){
500
310
/* "Use a log level over 10 to enable all debugging options."
501
311
* - GnuTLS manual
502
312
*/
505
315
}
506
316
507
317
/* OpenPGP credentials */
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();
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
319
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
321
safer_gnutls_strerror(ret));
513
322
return -1;
514
323
}
515
324
516
325
if(debug){
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
326
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
327
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
328
seckeyfile);
521
329
}
522
330
523
331
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
525
GNUTLS_OPENPGP_FMT_BASE64);
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));
532
goto globalfail;
332
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
333
if (ret != GNUTLS_E_SUCCESS) {
334
fprintf(stderr,
335
"Error[%d] while reading the OpenPGP key pair ('%s',"
336
" '%s')\n", ret, pubkeyfile, seckeyfile);
337
fprintf(stdout, "The GnuTLS error is: %s\n",
338
safer_gnutls_strerror(ret));
339
return -1;
533
340
}
534
341
535
342
/* GnuTLS server initialization */
536
343
ret = gnutls_dh_params_init(&mc->dh_params);
537
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
541
goto globalfail;
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
346
" %s\n", safer_gnutls_strerror(ret));
347
return -1;
542
348
}
543
349
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
goto globalfail;
350
if (ret != GNUTLS_E_SUCCESS) {
351
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
352
safer_gnutls_strerror(ret));
353
return -1;
548
354
}
549
355
550
356
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
551
357
552
358
return 0;
553
554
globalfail:
555
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
559
return -1;
560
359
}
561
360
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
361
static int init_gnutls_session(mandos_context *mc,
362
gnutls_session_t *session){
564
363
int ret;
565
364
/* GnuTLS session creation */
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));
365
ret = gnutls_init(session, GNUTLS_SERVER);
366
if (ret != GNUTLS_E_SUCCESS){
367
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
368
safer_gnutls_strerror(ret));
576
369
}
577
370
578
371
{
579
372
const char *err;
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);
373
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf(stderr, "Syntax error at: %s\n", err);
376
fprintf(stderr, "GnuTLS error: %s\n",
377
safer_gnutls_strerror(ret));
592
378
return -1;
593
379
}
594
380
}
595
381
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);
382
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
383
mc->cred);
384
if (ret != GNUTLS_E_SUCCESS) {
385
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
386
safer_gnutls_strerror(ret));
608
387
return -1;
609
388
}
610
389
611
390
/* ignore client certificate if any. */
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
391
gnutls_certificate_server_set_request (*session,
392
GNUTLS_CERT_IGNORE);
613
393
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
394
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
615
395
616
396
return 0;
617
397
}
621
401
__attribute__((unused)) const char *txt){}
622
402
623
403
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
404
static int start_mandos_communication(const char *ip, uint16_t port,
625
405
AvahiIfIndex if_index,
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;
406
mandos_context *mc){
407
int ret, tcp_sd;
408
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
633
409
char *buffer = NULL;
634
char *decrypted_buffer = NULL;
410
char *decrypted_buffer;
635
411
size_t buffer_length = 0;
636
412
size_t buffer_capacity = 0;
413
ssize_t decrypted_buffer_size;
637
414
size_t written;
638
int retval = -1;
415
int retval = 0;
416
char interface[IF_NAMESIZE];
639
417
gnutls_session_t session;
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
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
418
419
ret = init_gnutls_session (mc, &session);
420
if (ret != 0){
421
return -1;
422
}
423
424
if(debug){
425
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
426
ip, port);
427
}
428
429
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
430
if(tcp_sd < 0) {
431
perror("socket");
432
return -1;
433
}
434
435
if(debug){
436
if(if_indextoname((unsigned int)if_index, interface) == NULL){
437
perror("if_indextoname");
690
438
return -1;
691
439
}
440
fprintf(stderr, "Binding to interface %s\n", interface);
692
441
}
693
442
694
ret = init_gnutls_session(&session, mc);
695
if(ret != 0){
443
memset(&to,0,sizeof(to)); /* Spurious warning */
444
to.in6.sin6_family = AF_INET6;
445
/* It would be nice to have a way to detect if we were passed an
446
IPv4 address here. Now we assume an IPv6 address. */
447
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
448
if (ret < 0 ){
449
perror("inet_pton");
696
450
return -1;
697
451
}
698
699
if(debug){
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
702
}
703
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
705
if(tcp_sd < 0){
706
int e = errno;
707
perror_plus("socket");
708
errno = e;
709
goto mandos_end;
710
}
711
712
if(quit_now){
713
errno = EINTR;
714
goto mandos_end;
715
}
716
717
memset(&to, 0, sizeof(to));
718
if(af == AF_INET6){
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
721
} else { /* IPv4 */
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
724
}
725
if(ret < 0 ){
726
int e = errno;
727
perror_plus("inet_pton");
728
errno = e;
729
goto mandos_end;
730
}
731
452
if(ret == 0){
732
int e = errno;
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
734
errno = e;
735
goto mandos_end;
736
}
737
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
748
if(if_index == AVAHI_IF_UNSPEC){
749
fprintf_plus(stderr, "An IPv6 link-local address is"
750
" incomplete without a network interface\n");
751
errno = EINVAL;
752
goto mandos_end;
753
}
754
/* Set the network interface number as scope */
755
to.in6.sin6_scope_id = (uint32_t)if_index;
756
}
757
} else {
758
to.in.sin_port = htons(port);
759
}
453
fprintf(stderr, "Bad address: %s\n", ip);
454
return -1;
455
}
456
to.in6.sin6_port = htons(port); /* Spurious warning */
760
457
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
458
to.in6.sin6_scope_id = (uint32_t)if_index;
765
459
766
460
if(debug){
767
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
768
char interface[IF_NAMESIZE];
769
if(if_indextoname((unsigned int)if_index, interface) == NULL){
770
perror_plus("if_indextoname");
771
} else {
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
774
}
775
} else {
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
778
}
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
781
const char *pcret;
782
if(af == AF_INET6){
783
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
784
sizeof(addrstr));
785
} else {
786
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
787
sizeof(addrstr));
788
}
789
if(pcret == NULL){
790
perror_plus("inet_ntop");
461
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
462
char addrstr[INET6_ADDRSTRLEN] = "";
463
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
464
sizeof(addrstr)) == NULL){
465
perror("inet_ntop");
791
466
} else {
792
467
if(strcmp(addrstr, ip) != 0){
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
468
fprintf(stderr, "Canonical address form: %s\n", addrstr);
794
469
}
795
470
}
796
471
}
797
472
798
if(quit_now){
799
errno = EINTR;
800
goto mandos_end;
801
}
802
803
if(af == AF_INET6){
804
ret = connect(tcp_sd, &to.in6, sizeof(to));
805
} else {
806
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
807
}
808
if(ret < 0){
809
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
810
int e = errno;
811
perror_plus("connect");
812
errno = e;
813
}
814
goto mandos_end;
815
}
816
817
if(quit_now){
818
errno = EINTR;
819
goto mandos_end;
820
}
821
473
ret = connect(tcp_sd, &to.in, sizeof(to));
474
if (ret < 0){
475
perror("connect");
476
return -1;
477
}
478
822
479
const char *out = mandos_protocol_version;
823
480
written = 0;
824
while(true){
481
while (true){
825
482
size_t out_size = strlen(out);
826
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
827
out_size - written));
828
if(ret == -1){
829
int e = errno;
830
perror_plus("write");
831
errno = e;
483
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
484
out_size - written));
485
if (ret == -1){
486
perror("write");
487
retval = -1;
832
488
goto mandos_end;
833
489
}
834
490
written += (size_t)ret;
835
491
if(written < out_size){
836
492
continue;
837
493
} else {
838
if(out == mandos_protocol_version){
494
if (out == mandos_protocol_version){
839
495
written = 0;
840
496
out = "\r\n";
841
497
} else {
842
498
break;
843
499
}
844
500
}
845
846
if(quit_now){
847
errno = EINTR;
848
goto mandos_end;
849
}
850
501
}
851
502
852
503
if(debug){
853
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
854
}
855
856
if(quit_now){
857
errno = EINTR;
858
goto mandos_end;
859
}
860
861
/* This casting via intptr_t is to eliminate warning about casting
862
an int to a pointer type. This is exactly how the GnuTLS Guile
863
function "set-session-transport-fd!" does it. */
864
gnutls_transport_set_ptr(session,
865
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
866
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
871
872
do {
873
ret = gnutls_handshake(session);
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
879
880
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr, "Establishing TLS session with %s\n", ip);
505
}
506
507
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
508
509
ret = gnutls_handshake (session);
510
511
if (ret != GNUTLS_E_SUCCESS){
881
512
if(debug){
882
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
883
gnutls_perror(ret);
513
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
514
gnutls_perror (ret);
884
515
}
885
errno = EPROTO;
516
retval = -1;
886
517
goto mandos_end;
887
518
}
888
519
889
520
/* Read OpenPGP packet that contains the wanted password */
890
521
891
522
if(debug){
892
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
893
" %s\n", ip);
523
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
524
ip);
894
525
}
895
526
896
527
while(true){
897
898
if(quit_now){
899
errno = EINTR;
900
goto mandos_end;
901
}
902
903
buffer_capacity = incbuffer(&buffer, buffer_length,
904
buffer_capacity);
905
if(buffer_capacity == 0){
906
int e = errno;
907
perror_plus("incbuffer");
908
errno = e;
909
goto mandos_end;
910
}
911
912
if(quit_now){
913
errno = EINTR;
914
goto mandos_end;
915
}
916
917
sret = gnutls_record_recv(session, buffer+buffer_length,
918
BUFFER_SIZE);
919
if(sret == 0){
528
buffer_capacity = adjustbuffer(&buffer, buffer_length,
529
buffer_capacity);
530
if (buffer_capacity == 0){
531
perror("adjustbuffer");
532
retval = -1;
533
goto mandos_end;
534
}
535
536
ret = gnutls_record_recv(session, buffer+buffer_length,
537
BUFFER_SIZE);
538
if (ret == 0){
920
539
break;
921
540
}
922
if(sret < 0){
923
switch(sret){
541
if (ret < 0){
542
switch(ret){
924
543
case GNUTLS_E_INTERRUPTED:
925
544
case GNUTLS_E_AGAIN:
926
545
break;
927
546
case GNUTLS_E_REHANDSHAKE:
928
do {
929
ret = gnutls_handshake(session);
930
931
if(quit_now){
932
errno = EINTR;
933
goto mandos_end;
934
}
935
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
936
if(ret < 0){
937
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
938
"***\n");
939
gnutls_perror(ret);
940
errno = EPROTO;
547
ret = gnutls_handshake (session);
548
if (ret < 0){
549
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
550
gnutls_perror (ret);
551
retval = -1;
941
552
goto mandos_end;
942
553
}
943
554
break;
944
555
default:
945
fprintf_plus(stderr, "Unknown error while reading data from"
946
" encrypted session with Mandos server\n");
947
gnutls_bye(session, GNUTLS_SHUT_RDWR);
948
errno = EIO;
556
fprintf(stderr, "Unknown error while reading data from"
557
" encrypted session with Mandos server\n");
558
retval = -1;
559
gnutls_bye (session, GNUTLS_SHUT_RDWR);
949
560
goto mandos_end;
950
561
}
951
562
} else {
952
buffer_length += (size_t) sret;
563
buffer_length += (size_t) ret;
953
564
}
954
565
}
955
566
956
567
if(debug){
957
fprintf_plus(stderr, "Closing TLS session\n");
958
}
959
960
if(quit_now){
961
errno = EINTR;
962
goto mandos_end;
963
}
964
965
do {
966
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
967
if(quit_now){
968
errno = EINTR;
969
goto mandos_end;
970
}
971
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
972
973
if(buffer_length > 0){
974
ssize_t decrypted_buffer_size;
975
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
976
&decrypted_buffer, mc);
977
if(decrypted_buffer_size >= 0){
978
568
fprintf(stderr, "Closing TLS session\n");
569
}
570
571
gnutls_bye (session, GNUTLS_SHUT_RDWR);
572
573
if (buffer_length > 0){
574
decrypted_buffer_size = pgp_packet_decrypt(buffer,
575
buffer_length,
576
&decrypted_buffer,
577
keydir);
578
if (decrypted_buffer_size >= 0){
979
579
written = 0;
980
580
while(written < (size_t) decrypted_buffer_size){
981
if(quit_now){
982
errno = EINTR;
983
goto mandos_end;
984
}
985
986
ret = (int)fwrite(decrypted_buffer + written, 1,
987
(size_t)decrypted_buffer_size - written,
988
stdout);
581
ret = (int)fwrite (decrypted_buffer + written, 1,
582
(size_t)decrypted_buffer_size - written,
583
stdout);
989
584
if(ret == 0 and ferror(stdout)){
990
int e = errno;
991
585
if(debug){
992
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
993
strerror(errno));
586
fprintf(stderr, "Error writing encrypted data: %s\n",
587
strerror(errno));
994
588
}
995
errno = e;
996
goto mandos_end;
589
retval = -1;
590
break;
997
591
}
998
592
written += (size_t)ret;
999
593
}
1000
retval = 0;
594
free(decrypted_buffer);
595
} else {
596
retval = -1;
1001
597
}
1002
598
}
1003
599
1004
600
/* Shutdown procedure */
1005
601
1006
602
mandos_end:
1007
{
1008
int e = errno;
1009
free(decrypted_buffer);
1010
free(buffer);
1011
if(tcp_sd >= 0){
1012
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1013
}
1014
if(ret == -1){
1015
if(e == 0){
1016
e = errno;
1017
}
1018
perror_plus("close");
1019
}
1020
gnutls_deinit(session);
1021
errno = e;
1022
if(quit_now){
1023
errno = EINTR;
1024
retval = -1;
1025
}
1026
}
603
free(buffer);
604
close(tcp_sd);
605
gnutls_deinit (session);
606
gnutls_certificate_free_credentials (mc->cred);
607
gnutls_global_deinit ();
1027
608
return retval;
1028
609
}
1029
610
1030
611
static void resolve_callback(AvahiSServiceResolver *r,
1031
612
AvahiIfIndex interface,
1032
AvahiProtocol proto,
613
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1033
614
AvahiResolverEvent event,
1034
615
const char *name,
1035
616
const char *type,
1040
621
AVAHI_GCC_UNUSED AvahiStringList *txt,
1041
622
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1042
623
flags,
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
624
void* userdata) {
625
mandos_context *mc = userdata;
626
assert(r); /* Spurious warning */
1047
627
1048
628
/* Called whenever a service has been resolved successfully or
1049
629
timed out */
1050
630
1051
if(quit_now){
1052
return;
1053
}
1054
1055
switch(event){
631
switch (event) {
1056
632
default:
1057
633
case AVAHI_RESOLVER_FAILURE:
1058
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
634
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
635
" of type '%s' in domain '%s': %s\n", name, type, domain,
636
avahi_strerror(avahi_server_errno(mc->server)));
1063
637
break;
1064
638
1065
639
case AVAHI_RESOLVER_FOUND:
1067
641
char ip[AVAHI_ADDRESS_STR_MAX];
1068
642
avahi_address_snprint(ip, sizeof(ip), address);
1069
643
if(debug){
1070
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1071
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
host_name, ip, (intmax_t)interface, port);
644
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
645
" port %d\n", name, host_name, ip, interface, port);
1073
646
}
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
1078
if(ret == 0){
1079
avahi_simple_poll_quit(simple_poll);
1080
} else {
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
" list\n", name);
1086
}
647
int ret = start_mandos_communication(ip, port, interface, mc);
648
if (ret == 0){
649
exit(EXIT_SUCCESS);
1087
650
}
1088
651
}
1089
652
}
1090
653
avahi_s_service_resolver_free(r);
1091
654
}
1092
655
1093
static void browse_callback(AvahiSServiceBrowser *b,
1094
AvahiIfIndex interface,
1095
AvahiProtocol protocol,
1096
AvahiBrowserEvent event,
1097
const char *name,
1098
const char *type,
1099
const char *domain,
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1101
flags,
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
656
static void browse_callback( AvahiSServiceBrowser *b,
657
AvahiIfIndex interface,
658
AvahiProtocol protocol,
659
AvahiBrowserEvent event,
660
const char *name,
661
const char *type,
662
const char *domain,
663
AVAHI_GCC_UNUSED AvahiLookupResultFlags
664
flags,
665
void* userdata) {
666
mandos_context *mc = userdata;
667
assert(b); /* Spurious warning */
1106
668
1107
669
/* Called whenever a new services becomes available on the LAN or
1108
670
is removed from the LAN */
1109
671
1110
if(quit_now){
1111
return;
1112
}
1113
1114
switch(event){
672
switch (event) {
1115
673
default:
1116
674
case AVAHI_BROWSER_FAILURE:
1117
675
1118
fprintf_plus(stderr, "(Avahi browser) %s\n",
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
avahi_simple_poll_quit(simple_poll);
676
fprintf(stderr, "(Avahi browser) %s\n",
677
avahi_strerror(avahi_server_errno(mc->server)));
678
avahi_simple_poll_quit(mc->simple_poll);
1122
679
return;
1123
680
1124
681
case AVAHI_BROWSER_NEW:
1127
684
the callback function is called the Avahi server will free the
1128
685
resolver for us. */
1129
686
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1134
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
687
if (!(avahi_s_service_resolver_new(mc->server, interface,
688
protocol, name, type, domain,
689
AVAHI_PROTO_INET6, 0,
690
resolve_callback, mc)))
691
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
692
name, avahi_strerror(avahi_server_errno(mc->server)));
1138
693
break;
1139
694
1140
695
case AVAHI_BROWSER_REMOVE:
1143
698
case AVAHI_BROWSER_ALL_FOR_NOW:
1144
699
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1145
700
if(debug){
1146
fprintf_plus(stderr, "No Mandos server found, still"
1147
" searching...\n");
701
fprintf(stderr, "No Mandos server found, still searching...\n");
1148
702
}
1149
703
break;
1150
704
}
1151
705
}
1152
706
1153
/* Signal handler that stops main loop after SIGTERM */
1154
static void handle_sigterm(int sig){
1155
if(quit_now){
1156
return;
1157
}
1158
quit_now = 1;
1159
signal_received = sig;
1160
int old_errno = errno;
1161
/* set main loop to exit */
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1164
}
1165
errno = old_errno;
1166
}
1167
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
int ret;
1170
error_t ret_errno;
1171
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
if(s < 0){
1174
ret_errno = errno;
1175
perror_plus("socket");
1176
errno = ret_errno;
1177
return false;
1178
}
1179
strcpy(ifr->ifr_name, ifname);
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
if(ret == -1){
1182
if(debug){
1183
ret_errno = errno;
1184
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1186
}
1187
return false;
1188
}
1189
return true;
1190
}
1191
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1193
1194
/* Reject the loopback device */
1195
if(ifr->ifr_flags & IFF_LOOPBACK){
1196
if(debug){
1197
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1198
ifname);
1199
}
1200
return false;
1201
}
1202
/* Accept point-to-point devices only if connect_to is specified */
1203
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1204
if(debug){
1205
fprintf_plus(stderr, "Accepting point-to-point interface"
1206
" \"%s\"\n", ifname);
1207
}
1208
return true;
1209
}
1210
/* Otherwise, reject non-broadcast-capable devices */
1211
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1212
if(debug){
1213
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1214
" \"%s\"\n", ifname);
1215
}
1216
return false;
1217
}
1218
/* Reject non-ARP interfaces (including dummy interfaces) */
1219
if(ifr->ifr_flags & IFF_NOARP){
1220
if(debug){
1221
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1222
ifname);
1223
}
1224
return false;
1225
}
1226
1227
/* Accept this device */
1228
if(debug){
1229
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1230
}
1231
return true;
1232
}
1233
1234
/*
1235
* This function determines if a directory entry in /sys/class/net
1236
* corresponds to an acceptable network device.
1237
* (This function is passed to scandir(3) as a filter function.)
1238
*/
1239
int good_interface(const struct dirent *if_entry){
1240
if(if_entry->d_name[0] == '.'){
1241
return 0;
1242
}
1243
1244
struct ifreq ifr;
1245
if(not get_flags(if_entry->d_name, &ifr)){
1246
if(debug){
1247
fprintf_plus(stderr, "Failed to get flags for interface "
1248
"\"%s\"\n", if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
if(not good_flags(if_entry->d_name, &ifr)){
1254
return 0;
1255
}
1256
return 1;
1257
}
1258
1259
/*
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1289
}
1290
1291
int notdotentries(const struct dirent *direntry){
1292
/* Skip "." and ".." */
1293
if(direntry->d_name[0] == '.'
1294
and (direntry->d_name[1] == '\0'
1295
or (direntry->d_name[1] == '.'
1296
and direntry->d_name[2] == '\0'))){
1297
return 0;
1298
}
1299
return 1;
1300
}
1301
1302
/* Is this directory entry a runnable program? */
1303
int runnable_hook(const struct dirent *direntry){
1304
int ret;
1305
size_t sret;
1306
struct stat st;
1307
1308
if((direntry->d_name)[0] == '\0'){
1309
/* Empty name? */
1310
return 0;
1311
}
1312
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1314
"abcdefghijklmnopqrstuvwxyz"
1315
"0123456789"
1316
"_-");
1317
if((direntry->d_name)[sret] != '\0'){
1318
/* Contains non-allowed characters */
1319
if(debug){
1320
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1321
direntry->d_name);
1322
}
1323
return 0;
1324
}
1325
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
1334
if(ret == -1){
1335
if(debug){
1336
perror_plus("Could not stat hook");
1337
}
1338
return 0;
1339
}
1340
if(not (S_ISREG(st.st_mode))){
1341
/* Not a regular file */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1349
/* Not executable */
1350
if(debug){
1351
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1352
direntry->d_name);
1353
}
1354
return 0;
1355
}
1356
if(debug){
1357
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1358
direntry->d_name);
1359
}
1360
return 1;
1361
}
1362
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1365
int ret;
1366
struct timespec now;
1367
struct timespec waited_time;
1368
intmax_t block_time;
1369
1370
while(true){
1371
if(mc->current_server == NULL){
1372
if (debug){
1373
fprintf_plus(stderr, "Wait until first server is found."
1374
" No timeout!\n");
1375
}
1376
ret = avahi_simple_poll_iterate(s, -1);
1377
} else {
1378
if (debug){
1379
fprintf_plus(stderr, "Check current_server if we should run"
1380
" it, or wait\n");
1381
}
1382
/* the current time */
1383
ret = clock_gettime(CLOCK_MONOTONIC, &now);
707
/* Combines file name and path and returns the malloced new
708
string. some sane checks could/should be added */
709
static const char *combinepath(const char *first, const char *second){
710
size_t f_len = strlen(first);
711
size_t s_len = strlen(second);
712
char *tmp = malloc(f_len + s_len + 2);
713
if (tmp == NULL){
714
return NULL;
715
}
716
if(f_len > 0){
717
memcpy(tmp, first, f_len); /* Spurious warning */
718
}
719
tmp[f_len] = '/';
720
if(s_len > 0){
721
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
722
}
723
tmp[f_len + 1 + s_len] = '\0';
724
return tmp;
725
}
726
727
728
int main(int argc, char *argv[]){
729
AvahiSServiceBrowser *sb = NULL;
730
int error;
731
int ret;
732
int exitcode = EXIT_SUCCESS;
733
const char *interface = "eth0";
734
struct ifreq network;
735
int sd;
736
uid_t uid;
737
gid_t gid;
738
char *connect_to = NULL;
739
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
740
const char *pubkeyfile = "pubkey.txt";
741
const char *seckeyfile = "seckey.txt";
742
mandos_context mc = { .simple_poll = NULL, .server = NULL,
743
.dh_bits = 1024, .priority = "SECURE256"};
744
745
{
746
struct argp_option options[] = {
747
{ .name = "debug", .key = 128,
748
.doc = "Debug mode", .group = 3 },
749
{ .name = "connect", .key = 'c',
750
.arg = "IP",
751
.doc = "Connect directly to a sepcified mandos server",
752
.group = 1 },
753
{ .name = "interface", .key = 'i',
754
.arg = "INTERFACE",
755
.doc = "Interface that Avahi will conntect through",
756
.group = 1 },
757
{ .name = "keydir", .key = 'd',
758
.arg = "KEYDIR",
759
.doc = "Directory where the openpgp keyring is",
760
.group = 1 },
761
{ .name = "seckey", .key = 's',
762
.arg = "SECKEY",
763
.doc = "Secret openpgp key for gnutls authentication",
764
.group = 1 },
765
{ .name = "pubkey", .key = 'p',
766
.arg = "PUBKEY",
767
.doc = "Public openpgp key for gnutls authentication",
768
.group = 2 },
769
{ .name = "dh-bits", .key = 129,
770
.arg = "BITS",
771
.doc = "dh-bits to use in gnutls communication",
772
.group = 2 },
773
{ .name = "priority", .key = 130,
774
.arg = "PRIORITY",
775
.doc = "GNUTLS priority", .group = 1 },
776
{ .name = NULL }
777
};
778
779
780
error_t parse_opt (int key, char *arg,
781
struct argp_state *state) {
782
/* Get the INPUT argument from `argp_parse', which we know is
783
a pointer to our plugin list pointer. */
784
switch (key) {
785
case 128:
786
debug = true;
787
break;
788
case 'c':
789
connect_to = arg;
790
break;
791
case 'i':
792
interface = arg;
793
break;
794
case 'd':
795
keydir = arg;
796
break;
797
case 's':
798
seckeyfile = arg;
799
break;
800
case 'p':
801
pubkeyfile = arg;
802
break;
803
case 129:
804
errno = 0;
805
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
806
if (errno){
807
perror("strtol");
808
exit(EXIT_FAILURE);
809
}
810
break;
811
case 130:
812
mc.priority = arg;
813
break;
814
case ARGP_KEY_ARG:
815
argp_usage (state);
816
break;
817
case ARGP_KEY_END:
818
break;
819
default:
820
return ARGP_ERR_UNKNOWN;
821
}
822
return 0;
823
}
824
825
struct argp argp = { .options = options, .parser = parse_opt,
826
.args_doc = "",
827
.doc = "Mandos client -- Get and decrypt"
828
" passwords from mandos server" };
829
argp_parse (&argp, argc, argv, 0, 0, NULL);
830
}
831
832
pubkeyfile = combinepath(keydir, pubkeyfile);
833
if (pubkeyfile == NULL){
834
perror("combinepath");
835
exitcode = EXIT_FAILURE;
836
goto end;
837
}
838
839
seckeyfile = combinepath(keydir, seckeyfile);
840
if (seckeyfile == NULL){
841
perror("combinepath");
842
goto end;
843
}
844
845
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
846
if (ret == -1){
847
fprintf(stderr, "init_gnutls_global\n");
848
goto end;
849
}
850
851
uid = getuid();
852
gid = getgid();
853
854
ret = setuid(uid);
855
if (ret == -1){
856
perror("setuid");
857
}
858
859
setgid(gid);
860
if (ret == -1){
861
perror("setgid");
862
}
863
864
if_index = (AvahiIfIndex) if_nametoindex(interface);
865
if(if_index == 0){
866
fprintf(stderr, "No such interface: \"%s\"\n", interface);
867
exit(EXIT_FAILURE);
868
}
869
870
if(connect_to != NULL){
871
/* Connect directly, do not use Zeroconf */
872
/* (Mainly meant for debugging) */
873
char *address = strrchr(connect_to, ':');
874
if(address == NULL){
875
fprintf(stderr, "No colon in address\n");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
errno = 0;
880
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
881
if(errno){
882
perror("Bad port number");
883
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
*address = '\0';
887
address = connect_to;
888
ret = start_mandos_communication(address, port, if_index, &mc);
889
if(ret < 0){
890
exitcode = EXIT_FAILURE;
891
} else {
892
exitcode = EXIT_SUCCESS;
893
}
894
goto end;
895
}
896
897
/* If the interface is down, bring it up */
898
{
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
if(sd < 0) {
901
perror("socket");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1384
907
if(ret == -1){
1385
perror_plus("clock_gettime");
1386
return -1;
1387
}
1388
/* Calculating in ms how long time between now and server
1389
who we visted longest time ago. Now - last seen. */
1390
waited_time.tv_sec = (now.tv_sec
1391
- mc->current_server->last_seen.tv_sec);
1392
waited_time.tv_nsec = (now.tv_nsec
1393
- mc->current_server->last_seen.tv_nsec);
1394
/* total time is 10s/10,000ms.
1395
Converting to s from ms by dividing by 1,000,
1396
and ns to ms by dividing by 1,000,000. */
1397
block_time = ((retry_interval
1398
- ((intmax_t)waited_time.tv_sec * 1000))
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1400
1401
if (debug){
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1403
block_time);
1404
}
1405
1406
if(block_time <= 0){
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1411
if(ret == 0){
1412
avahi_simple_poll_quit(s);
1413
return 0;
1414
}
1415
ret = clock_gettime(CLOCK_MONOTONIC,
1416
&mc->current_server->last_seen);
1417
if(ret == -1){
1418
perror_plus("clock_gettime");
1419
return -1;
1420
}
1421
mc->current_server = mc->current_server->next;
1422
block_time = 0; /* Call avahi to find new Mandos
1423
servers, but don't block */
1424
}
1425
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1427
}
1428
if(ret != 0){
1429
if (ret > 0 or errno != EINTR){
1430
return (ret != 1) ? ret : 0;
1431
}
1432
}
1433
}
1434
}
1435
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
1489
const float delay){
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1495
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1503
}
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
1511
perror_plus("asprintf");
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1582
} else {
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
1619
}
1620
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
910
goto end;
911
}
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
if(ret == -1){
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
1658
921
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
1791
}
1792
1793
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1798
AvahiSServiceBrowser *sb = NULL;
1799
error_t ret_errno;
1800
int ret;
1801
intmax_t tmpmax;
1802
char *tmp;
1803
int exitcode = EXIT_SUCCESS;
1804
char *interfaces_to_take_down = NULL;
1805
size_t interfaces_to_take_down_size = 0;
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1807
bool tempdir_created = false;
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1809
const char *seckey = PATHDIR "/" SECKEY;
1810
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1813
1814
bool gnutls_initialized = false;
1815
bool gpgme_initialized = false;
1816
float delay = 2.5f;
1817
double retry_interval = 10; /* 10s between trying a server and
1818
retrying the same server again */
1819
1820
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1821
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1822
1823
uid = getuid();
1824
gid = getgid();
1825
1826
/* Lower any group privileges we might have, just to be safe */
1827
errno = 0;
1828
ret = setgid(gid);
1829
if(ret == -1){
1830
perror_plus("setgid");
1831
}
1832
1833
/* Lower user privileges (temporarily) */
1834
errno = 0;
1835
ret = seteuid(uid);
1836
if(ret == -1){
1837
perror_plus("seteuid");
1838
}
1839
1840
if(quit_now){
1841
goto end;
1842
}
1843
1844
{
1845
struct argp_option options[] = {
1846
{ .name = "debug", .key = 128,
1847
.doc = "Debug mode", .group = 3 },
1848
{ .name = "connect", .key = 'c',
1849
.arg = "ADDRESS:PORT",
1850
.doc = "Connect directly to a specific Mandos server",
1851
.group = 1 },
1852
{ .name = "interface", .key = 'i',
1853
.arg = "NAME",
1854
.doc = "Network interface that will be used to search for"
1855
" Mandos servers",
1856
.group = 1 },
1857
{ .name = "seckey", .key = 's',
1858
.arg = "FILE",
1859
.doc = "OpenPGP secret key file base name",
1860
.group = 1 },
1861
{ .name = "pubkey", .key = 'p',
1862
.arg = "FILE",
1863
.doc = "OpenPGP public key file base name",
1864
.group = 2 },
1865
{ .name = "dh-bits", .key = 129,
1866
.arg = "BITS",
1867
.doc = "Bit length of the prime number used in the"
1868
" Diffie-Hellman key exchange",
1869
.group = 2 },
1870
{ .name = "priority", .key = 130,
1871
.arg = "STRING",
1872
.doc = "GnuTLS priority string for the TLS handshake",
1873
.group = 1 },
1874
{ .name = "delay", .key = 131,
1875
.arg = "SECONDS",
1876
.doc = "Maximum delay to wait for interface startup",
1877
.group = 2 },
1878
{ .name = "retry", .key = 132,
1879
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1881
.group = 2 },
1882
{ .name = "network-hook-dir", .key = 133,
1883
.arg = "DIR",
1884
.doc = "Directory where network hooks are located",
1885
.group = 2 },
1886
/*
1887
* These reproduce what we would get without ARGP_NO_HELP
1888
*/
1889
{ .name = "help", .key = '?',
1890
.doc = "Give this help list", .group = -1 },
1891
{ .name = "usage", .key = -3,
1892
.doc = "Give a short usage message", .group = -1 },
1893
{ .name = "version", .key = 'V',
1894
.doc = "Print program version", .group = -1 },
1895
{ .name = NULL }
1896
};
1897
1898
error_t parse_opt(int key, char *arg,
1899
struct argp_state *state){
1900
errno = 0;
1901
switch(key){
1902
case 128: /* --debug */
1903
debug = true;
1904
break;
1905
case 'c': /* --connect */
1906
connect_to = arg;
1907
break;
1908
case 'i': /* --interface */
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1914
break;
1915
case 's': /* --seckey */
1916
seckey = arg;
1917
break;
1918
case 'p': /* --pubkey */
1919
pubkey = arg;
1920
break;
1921
case 129: /* --dh-bits */
1922
errno = 0;
1923
tmpmax = strtoimax(arg, &tmp, 10);
1924
if(errno != 0 or tmp == arg or *tmp != '\0'
1925
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1926
argp_error(state, "Bad number of DH bits");
1927
}
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1929
break;
1930
case 130: /* --priority */
1931
mc.priority = arg;
1932
break;
1933
case 131: /* --delay */
1934
errno = 0;
1935
delay = strtof(arg, &tmp);
1936
if(errno != 0 or tmp == arg or *tmp != '\0'){
1937
argp_error(state, "Bad delay");
1938
}
1939
case 132: /* --retry */
1940
errno = 0;
1941
retry_interval = strtod(arg, &tmp);
1942
if(errno != 0 or tmp == arg or *tmp != '\0'
1943
or (retry_interval * 1000) > INT_MAX
1944
or retry_interval < 0){
1945
argp_error(state, "Bad retry interval");
1946
}
1947
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
break;
1951
/*
1952
* These reproduce what we would get without ARGP_NO_HELP
1953
*/
1954
case '?': /* --help */
1955
argp_state_help(state, state->out_stream,
1956
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1957
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1958
case -3: /* --usage */
1959
argp_state_help(state, state->out_stream,
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
case 'V': /* --version */
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1963
exit(argp_err_exit_status);
1964
break;
1965
default:
1966
return ARGP_ERR_UNKNOWN;
1967
}
1968
return errno;
1969
}
1970
1971
struct argp argp = { .options = options, .parser = parse_opt,
1972
.args_doc = "",
1973
.doc = "Mandos client -- Get and decrypt"
1974
" passwords from a Mandos server" };
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
1978
case 0:
1979
break;
1980
case ENOMEM:
1981
default:
1982
errno = ret;
1983
perror_plus("argp_parse");
1984
exitcode = EX_OSERR;
1985
goto end;
1986
case EINVAL:
1987
exitcode = EX_USAGE;
1988
goto end;
1989
}
1990
}
1991
1992
{
1993
/* Work around Debian bug #633582:
1994
<http://bugs.debian.org/633582> */
1995
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2081
}
2082
2083
if(not debug){
2084
avahi_set_log_function(empty_log);
2085
}
2086
2087
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
from the signal handler */
2089
/* Initialize the pseudo-RNG for Avahi */
2090
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
2095
exitcode = EX_UNAVAILABLE;
2096
goto end;
2097
}
2098
2099
sigemptyset(&sigterm_action.sa_mask);
2100
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2101
if(ret == -1){
2102
perror_plus("sigaddset");
2103
exitcode = EX_OSERR;
2104
goto end;
2105
}
2106
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2107
if(ret == -1){
2108
perror_plus("sigaddset");
2109
exitcode = EX_OSERR;
2110
goto end;
2111
}
2112
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2113
if(ret == -1){
2114
perror_plus("sigaddset");
2115
exitcode = EX_OSERR;
2116
goto end;
2117
}
2118
/* Need to check if the handler is SIG_IGN before handling:
2119
| [[info:libc:Initial Signal Actions]] |
2120
| [[info:libc:Basic Signal Handling]] |
2121
*/
2122
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2123
if(ret == -1){
2124
perror_plus("sigaction");
2125
return EX_OSERR;
2126
}
2127
if(old_sigterm_action.sa_handler != SIG_IGN){
2128
ret = sigaction(SIGINT, &sigterm_action, NULL);
2129
if(ret == -1){
2130
perror_plus("sigaction");
2131
exitcode = EX_OSERR;
2132
goto end;
2133
}
2134
}
2135
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2136
if(ret == -1){
2137
perror_plus("sigaction");
2138
return EX_OSERR;
2139
}
2140
if(old_sigterm_action.sa_handler != SIG_IGN){
2141
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2142
if(ret == -1){
2143
perror_plus("sigaction");
2144
exitcode = EX_OSERR;
2145
goto end;
2146
}
2147
}
2148
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2149
if(ret == -1){
2150
perror_plus("sigaction");
2151
return EX_OSERR;
2152
}
2153
if(old_sigterm_action.sa_handler != SIG_IGN){
2154
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2155
if(ret == -1){
2156
perror_plus("sigaction");
2157
exitcode = EX_OSERR;
2158
goto end;
2159
}
2160
}
2161
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
interface = NULL;
2208
}
2209
}
2210
break;
2211
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2237
}
2238
2239
if(quit_now){
2240
goto end;
2241
}
2242
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
2244
if(ret == -1){
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
2246
exitcode = EX_UNAVAILABLE;
2247
goto end;
2248
} else {
2249
gnutls_initialized = true;
2250
}
2251
2252
if(quit_now){
2253
goto end;
2254
}
2255
2256
if(mkdtemp(tempdir) == NULL){
2257
perror_plus("mkdtemp");
2258
goto end;
2259
}
2260
tempdir_created = true;
2261
2262
if(quit_now){
2263
goto end;
2264
}
2265
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2267
fprintf_plus(stderr, "init_gpgme failed\n");
2268
exitcode = EX_UNAVAILABLE;
2269
goto end;
2270
} else {
2271
gpgme_initialized = true;
2272
}
2273
2274
if(quit_now){
2275
goto end;
2276
}
2277
2278
if(connect_to != NULL){
2279
/* Connect directly, do not use Zeroconf */
2280
/* (Mainly meant for debugging) */
2281
char *address = strrchr(connect_to, ':');
2282
2283
if(address == NULL){
2284
fprintf_plus(stderr, "No colon in address\n");
2285
exitcode = EX_USAGE;
2286
goto end;
2287
}
2288
2289
if(quit_now){
2290
goto end;
2291
}
2292
2293
in_port_t port;
2294
errno = 0;
2295
tmpmax = strtoimax(address+1, &tmp, 10);
2296
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2297
or tmpmax != (in_port_t)tmpmax){
2298
fprintf_plus(stderr, "Bad port number\n");
2299
exitcode = EX_USAGE;
2300
goto end;
2301
}
2302
2303
if(quit_now){
2304
goto end;
2305
}
2306
2307
port = (in_port_t)tmpmax;
2308
*address = '\0';
2309
/* Colon in address indicates IPv6 */
2310
int af;
2311
if(strchr(connect_to, ':') != NULL){
2312
af = AF_INET6;
2313
/* Accept [] around IPv6 address - see RFC 5952 */
2314
if(connect_to[0] == '[' and address[-1] == ']')
2315
{
2316
connect_to++;
2317
address[-1] = '\0';
2318
}
2319
} else {
2320
af = AF_INET;
2321
}
2322
address = connect_to;
2323
2324
if(quit_now){
2325
goto end;
2326
}
2327
2328
while(not quit_now){
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
2331
if(quit_now or ret == 0){
2332
break;
2333
}
2334
if(debug){
2335
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
(int)retry_interval);
2337
}
2338
sleep((unsigned int)retry_interval);
2339
}
2340
2341
if (not quit_now){
2342
exitcode = EXIT_SUCCESS;
2343
}
2344
2345
goto end;
2346
}
2347
2348
if(quit_now){
2349
goto end;
2350
}
2351
2352
{
2353
AvahiServerConfig config;
2354
/* Do not publish any local Zeroconf records */
2355
avahi_server_config_init(&config);
2356
config.publish_hinfo = 0;
2357
config.publish_addresses = 0;
2358
config.publish_workstation = 0;
2359
config.publish_domain = 0;
2360
2361
/* Allocate a new server */
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
2364
2365
/* Free the Avahi configuration data */
2366
avahi_server_config_free(&config);
2367
}
2368
2369
/* Check if creating the Avahi server object succeeded */
2370
if(mc.server == NULL){
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
2373
exitcode = EX_UNAVAILABLE;
2374
goto end;
2375
}
2376
2377
if(quit_now){
2378
goto end;
2379
}
2380
2381
/* Create the Avahi service browser */
2382
sb = avahi_s_service_browser_new(mc.server, if_index,
2383
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
2386
if(sb == NULL){
2387
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
avahi_strerror(avahi_server_errno(mc.server)));
2389
exitcode = EX_UNAVAILABLE;
2390
goto end;
2391
}
2392
2393
if(quit_now){
2394
goto end;
2395
}
2396
2397
/* Run the main loop */
2398
2399
if(debug){
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
2401
}
2402
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2405
if(debug){
2406
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
(ret == 0) ? "successfully" : "with error");
2408
}
2409
922
}
923
924
if (not debug){
925
avahi_set_log_function(empty_log);
926
}
927
928
/* Initialize the pseudo-RNG for Avahi */
929
srand((unsigned int) time(NULL));
930
931
/* Allocate main Avahi loop object */
932
mc.simple_poll = avahi_simple_poll_new();
933
if (mc.simple_poll == NULL) {
934
fprintf(stderr, "Avahi: Failed to create simple poll"
935
" object.\n");
936
exitcode = EXIT_FAILURE;
937
goto end;
938
}
939
940
{
941
AvahiServerConfig config;
942
/* Do not publish any local Zeroconf records */
943
avahi_server_config_init(&config);
944
config.publish_hinfo = 0;
945
config.publish_addresses = 0;
946
config.publish_workstation = 0;
947
config.publish_domain = 0;
948
949
/* Allocate a new server */
950
mc.server = avahi_server_new(avahi_simple_poll_get
951
(mc.simple_poll), &config, NULL,
952
NULL, &error);
953
954
/* Free the Avahi configuration data */
955
avahi_server_config_free(&config);
956
}
957
958
/* Check if creating the Avahi server object succeeded */
959
if (mc.server == NULL) {
960
fprintf(stderr, "Failed to create Avahi server: %s\n",
961
avahi_strerror(error));
962
exitcode = EXIT_FAILURE;
963
goto end;
964
}
965
966
/* Create the Avahi service browser */
967
sb = avahi_s_service_browser_new(mc.server, if_index,
968
AVAHI_PROTO_INET6,
969
"_mandos._tcp", NULL, 0,
970
browse_callback, &mc);
971
if (sb == NULL) {
972
fprintf(stderr, "Failed to create service browser: %s\n",
973
avahi_strerror(avahi_server_errno(mc.server)));
974
exitcode = EXIT_FAILURE;
975
goto end;
976
}
977
978
/* Run the main loop */
979
980
if (debug){
981
fprintf(stderr, "Starting Avahi loop search\n");
982
}
983
984
avahi_simple_poll_loop(mc.simple_poll);
985
2410
986
end:
2411
2412
if(debug){
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2414
}
2415
2416
/* Cleanup things */
2417
free(mc.interfaces);
2418
2419
if(sb != NULL)
2420
avahi_s_service_browser_free(sb);
2421
2422
if(mc.server != NULL)
2423
avahi_server_free(mc.server);
2424
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
2427
2428
if(gnutls_initialized){
2429
gnutls_certificate_free_credentials(mc.cred);
2430
gnutls_global_deinit();
2431
gnutls_dh_params_deinit(mc.dh_params);
2432
}
2433
2434
if(gpgme_initialized){
2435
gpgme_release(mc.ctx);
2436
}
2437
2438
/* Cleans up the circular linked list of Mandos servers the client
2439
has seen */
2440
if(mc.current_server != NULL){
2441
mc.current_server->prev->next = NULL;
2442
while(mc.current_server != NULL){
2443
server *next = mc.current_server->next;
2444
free(mc.current_server);
2445
mc.current_server = next;
2446
}
2447
}
2448
2449
/* Re-raise priviliges */
2450
{
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
2467
}
2468
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2472
}
2473
}
2474
2475
lower_privileges_permanently();
2476
}
2477
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2480
2481
/* Removes the GPGME temp directory and all files inside */
2482
if(tempdir_created){
2483
struct dirent **direntries = NULL;
2484
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
2488
for(int i = 0; i < numentries; i++){
2489
direntry = direntries[i];
2490
char *fullname = NULL;
2491
ret = asprintf(&fullname, "%s/%s", tempdir,
2492
direntry->d_name);
2493
if(ret < 0){
2494
perror_plus("asprintf");
2495
continue;
2496
}
2497
ret = remove(fullname);
2498
if(ret == -1){
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
2501
}
2502
free(fullname);
2503
}
2504
}
2505
2506
/* need to clean even if 0 because man page doesn't specify */
2507
free(direntries);
2508
if (numentries == -1){
2509
perror_plus("scandir");
2510
}
2511
ret = rmdir(tempdir);
2512
if(ret == -1 and errno != ENOENT){
2513
perror_plus("rmdir");
2514
}
2515
}
2516
2517
if(quit_now){
2518
sigemptyset(&old_sigterm_action.sa_mask);
2519
old_sigterm_action.sa_handler = SIG_DFL;
2520
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2521
&old_sigterm_action,
2522
NULL));
2523
if(ret == -1){
2524
perror_plus("sigaction");
2525
}
2526
do {
2527
ret = raise(signal_received);
2528
} while(ret != 0 and errno == EINTR);
2529
if(ret != 0){
2530
perror_plus("raise");
2531
abort();
2532
}
2533
TEMP_FAILURE_RETRY(pause());
2534
}
2535
2536
return exitcode;
987
988
if (debug){
989
fprintf(stderr, "%s exiting\n", argv[0]);
990
}
991
992
/* Cleanup things */
993
if (sb != NULL)
994
avahi_s_service_browser_free(sb);
995
996
if (mc.server != NULL)
997
avahi_server_free(mc.server);
998
999
if (mc.simple_poll != NULL)
1000
avahi_simple_poll_free(mc.simple_poll);
1001
free(pubkeyfile);
1002
free(seckeyfile);
1003
1004
return exitcode;
2537
1005
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0