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- Committer: Teddy Hogeborn
- Date: 2008-08-29 05:53:59 UTC
- Revision ID: teddy@fukt.bsnet.se-20080829055359-wkdasnyxtylmnxus
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
"&COMMANDNAME;".
* plugins.d/password-prompt.c (main): Improved some documentation
strings. Do perror() of
tcgetattr() fails. Add debug
output if interrupted by signal.
Loop over write() instead of
using fwrite() when outputting
password. Add debug output if
getline() returns 0, unless it
was caused by a signal. Add
exit status code to debug
output.
* plugins.d/password-prompt.xml: Changed all single quotes to double
quotes for consistency. Removed
<?xml-stylesheet>.
(ENTITY TIMESTAMP): New. Automatically updated by Emacs time-stamp
by using Emacs local variables.
(/refentry/refentryinfo/title): Changed to "Mandos Manual".
(/refentry/refentryinfo/productname): Changed to "Mandos".
(/refentry/refentryinfo/date): New; set to "&TIMESTAMP;".
(/refentry/refentryinfo/copyright): Split copyright holders.
(/refentry/refnamediv/refpurpose): Improved wording.
(SYNOPSIS): Fix to use correct markup. Add short options.
(DESCRIPTION, OPTIONS): Improved wording.
(OPTIONS): Improved wording. Use more correct markup. Document
short options.
(EXIT STATUS): Add text.
(ENVIRONMENT): Document use of "cryptsource" and "crypttarget".
(FILES): REMOVED.
(BUGS): Add text.
(EXAMPLE): Added some examples.
(SECURITY): Added text.
(SEE ALSO): Remove reference to mandos(8). Add reference to
crypttab(5).
"&COMMANDNAME;".
* plugins.d/password-prompt.c (main): Improved some documentation
strings. Do perror() of
tcgetattr() fails. Add debug
output if interrupted by signal.
Loop over write() instead of
using fwrite() when outputting
password. Add debug output if
getline() returns 0, unless it
was caused by a signal. Add
exit status code to debug
output.
* plugins.d/password-prompt.xml: Changed all single quotes to double
quotes for consistency. Removed
<?xml-stylesheet>.
(ENTITY TIMESTAMP): New. Automatically updated by Emacs time-stamp
by using Emacs local variables.
(/refentry/refentryinfo/title): Changed to "Mandos Manual".
(/refentry/refentryinfo/productname): Changed to "Mandos".
(/refentry/refentryinfo/date): New; set to "&TIMESTAMP;".
(/refentry/refentryinfo/copyright): Split copyright holders.
(/refentry/refnamediv/refpurpose): Improved wording.
(SYNOPSIS): Fix to use correct markup. Add short options.
(DESCRIPTION, OPTIONS): Improved wording.
(OPTIONS): Improved wording. Use more correct markup. Document
short options.
(EXIT STATUS): Add text.
(ENVIRONMENT): Document use of "cryptsource" and "crypttarget".
(FILES): REMOVED.
(BUGS): Add text.
(EXAMPLE): Added some examples.
(SECURITY): Added text.
(SEE ALSO): Remove reference to mandos(8). Add reference to
crypttab(5).
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugins.d/password-request.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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
38
stdout, ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#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 */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#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() */
53
struct in6_addr, inet_pton(),
54
connect() */
64
55
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
68
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
59
SIOCSIFFLAGS, if_indextoname(),
70
60
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
79
67
#include <argp.h> /* struct argp_option, error_t, struct
80
68
argp_state, struct argp,
81
69
argp_parse(), ARGP_KEY_ARG,
82
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
91
#ifdef __linux__
92
#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
94
71
95
72
/* Avahi */
96
73
/* All Avahi types, constants and functions
109
86
gnutls_*
110
87
init_gnutls_session(),
111
88
GNUTLS_* */
112
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
114
90
GNUTLS_OPENPGP_FMT_BASE64 */
115
91
116
92
/* GPGME */
122
98
123
99
#define BUFFER_SIZE 256
124
100
125
#define PATHDIR "/conf/conf.d/mandos"
126
#define SECKEY "seckey.txt"
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
130
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
131
103
static const char mandos_protocol_version[] = "1";
132
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
106
149
107
/* Used for passing in values through the Avahi callback functions */
150
108
typedef struct {
154
112
unsigned int dh_bits;
155
113
gnutls_dh_params_t dh_params;
156
114
const char *priority;
157
gpgme_ctx_t ctx;
158
server *current_server;
159
115
} mandos_context;
160
116
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
117
/*
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
180
120
* "buffer_length" is how much is already used.
181
121
*/
182
size_t incbuffer(char **buffer, size_t buffer_length,
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
183
123
size_t buffer_capacity){
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
185
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
126
if (buffer == NULL){
187
127
return 0;
188
128
}
189
129
buffer_capacity += BUFFER_SIZE;
191
131
return buffer_capacity;
192
132
}
193
133
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
198
int ret;
199
server *new_server = malloc(sizeof(server));
200
if(new_server == NULL){
201
perror_plus("malloc");
202
return -1;
203
}
204
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
208
if(new_server->ip == NULL){
209
perror_plus("strdup");
210
return -1;
211
}
212
/* Special case of first server */
213
if (mc.current_server == NULL){
214
new_server->next = new_server;
215
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
218
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
221
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
230
}
231
232
134
/*
233
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
234
137
*/
235
static bool init_gpgme(const char *seckey,
236
const char *pubkey, const char *tempdir){
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
237
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
238
148
gpgme_engine_info_t engine_info;
239
149
240
241
/*
242
* Helper function to insert pub and seckey to the engine keyring.
243
*/
244
bool import_key(const char *filename){
245
int ret;
246
int fd;
247
gpgme_data_t pgp_data;
248
249
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
250
if(fd == -1){
251
perror_plus("open");
252
return false;
253
}
254
255
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
259
gpgme_strsource(rc), gpgme_strerror(rc));
260
return false;
261
}
262
263
rc = gpgme_op_import(mc.ctx, pgp_data);
264
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
268
return false;
269
}
270
271
ret = (int)TEMP_FAILURE_RETRY(close(fd));
272
if(ret == -1){
273
perror_plus("close");
274
}
275
gpgme_data_release(pgp_data);
276
return true;
277
}
278
279
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
282
152
}
283
153
284
154
/* Init GPGME */
285
155
gpgme_check_version(NULL);
286
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
290
159
gpgme_strsource(rc), gpgme_strerror(rc));
291
return false;
160
return -1;
292
161
}
293
162
294
163
/* Set GPGME home directory for the OpenPGP engine only */
295
rc = gpgme_get_engine_info(&engine_info);
296
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
167
gpgme_strsource(rc), gpgme_strerror(rc));
300
return false;
168
return -1;
301
169
}
302
170
while(engine_info != NULL){
303
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
304
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
305
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
306
174
break;
307
175
}
308
176
engine_info = engine_info->next;
309
177
}
310
178
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
313
return false;
314
}
315
316
/* Create new GPGME "context" */
317
rc = gpgme_new(&(mc.ctx));
318
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
322
return false;
323
}
324
325
if(not import_key(pubkey) or not import_key(seckey)){
326
return false;
327
}
328
329
return true;
330
}
331
332
/*
333
* Decrypt OpenPGP data.
334
* Returns -1 on error
335
*/
336
static ssize_t pgp_packet_decrypt(const char *cryptotext,
337
size_t crypto_size,
338
char **plaintext){
339
gpgme_data_t dh_crypto, dh_plain;
340
gpgme_error_t rc;
341
ssize_t ret;
342
size_t plaintext_capacity = 0;
343
ssize_t plaintext_length = 0;
344
345
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
348
181
}
349
182
350
183
/* Create new GPGME data buffer from memory cryptotext */
351
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
185
0);
353
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
356
188
gpgme_strsource(rc), gpgme_strerror(rc));
357
189
return -1;
358
190
}
359
191
360
192
/* Create new empty GPGME data buffer for the plaintext */
361
193
rc = gpgme_data_new(&dh_plain);
362
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
365
196
gpgme_strsource(rc), gpgme_strerror(rc));
366
197
gpgme_data_release(dh_crypto);
367
198
return -1;
368
199
}
369
200
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
370
210
/* Decrypt data from the cryptotext data buffer to the plaintext
371
211
data buffer */
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
373
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
215
gpgme_strsource(rc), gpgme_strerror(rc));
377
216
plaintext_length = -1;
378
if(debug){
217
if (debug){
379
218
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
381
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
222
} else {
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
223
fprintf(stderr, "Unsupported algorithm: %s\n",
387
224
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
225
fprintf(stderr, "Wrong key usage: %u\n",
390
226
result->wrong_key_usage);
391
227
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
228
fprintf(stderr, "File name: %s\n", result->file_name);
394
229
}
395
230
gpgme_recipient_t recipient;
396
231
recipient = result->recipients;
397
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
407
recipient = recipient->next;
232
if(recipient){
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
239
? "No" : "Yes");
240
recipient = recipient->next;
241
}
408
242
}
409
243
}
410
244
}
412
246
}
413
247
414
248
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
250
}
418
251
419
252
/* 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");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
422
255
plaintext_length = -1;
423
256
goto decrypt_end;
424
257
}
425
258
426
259
*plaintext = NULL;
427
260
while(true){
428
plaintext_capacity = incbuffer(plaintext,
261
plaintext_capacity = adjustbuffer(plaintext,
429
262
(size_t)plaintext_length,
430
263
plaintext_capacity);
431
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
433
266
plaintext_length = -1;
434
267
goto decrypt_end;
435
268
}
437
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
438
271
BUFFER_SIZE);
439
272
/* Print the data, if any */
440
if(ret == 0){
273
if (ret == 0){
441
274
/* EOF */
442
275
break;
443
276
}
444
277
if(ret < 0){
445
perror_plus("gpgme_data_read");
278
perror("gpgme_data_read");
446
279
plaintext_length = -1;
447
280
goto decrypt_end;
448
281
}
449
282
plaintext_length += ret;
450
283
}
451
284
452
285
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
286
fprintf(stderr, "Decrypted password is: ");
455
287
for(ssize_t i = 0; i < plaintext_length; i++){
456
288
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
289
}
468
300
return plaintext_length;
469
301
}
470
302
471
static const char * safer_gnutls_strerror(int value){
472
const char *ret = gnutls_strerror(value); /* Spurious warning from
473
-Wunreachable-code */
474
if(ret == NULL)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
475
306
ret = "(unknown)";
476
307
return ret;
477
308
}
479
310
/* GnuTLS log function callback */
480
311
static void debuggnutls(__attribute__((unused)) int level,
481
312
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
313
fprintf(stderr, "GnuTLS: %s", string);
483
314
}
484
315
485
static int init_gnutls_global(const char *pubkeyfilename,
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
486
318
const char *seckeyfilename){
487
319
int ret;
488
320
489
321
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
322
fprintf(stderr, "Initializing GnuTLS\n");
492
323
}
493
324
494
325
ret = gnutls_global_init();
495
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
498
329
return -1;
499
330
}
500
331
501
if(debug){
332
if (debug){
502
333
/* "Use a log level over 10 to enable all debugging options."
503
334
* - GnuTLS manual
504
335
*/
507
338
}
508
339
509
340
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
514
gnutls_global_deinit();
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
warning */
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
515
347
return -1;
516
348
}
517
349
518
350
if(debug){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
522
353
seckeyfilename);
523
354
}
524
355
525
356
ret = gnutls_certificate_set_openpgp_key_file
526
(mc.cred, pubkeyfilename, seckeyfilename,
357
(mc->cred, pubkeyfilename, seckeyfilename,
527
358
GNUTLS_OPENPGP_FMT_BASE64);
528
if(ret != GNUTLS_E_SUCCESS){
359
if (ret != GNUTLS_E_SUCCESS) {
529
360
fprintf(stderr,
530
"Mandos plugin mandos-client: "
531
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
363
fprintf(stdout, "The GnuTLS error is: %s\n",
364
safer_gnutls_strerror(ret));
535
365
goto globalfail;
536
366
}
537
367
538
368
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
540
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
543
" %s\n", safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
550
safer_gnutls_strerror(ret));
551
goto globalfail;
552
}
553
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
555
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
373
goto globalfail;
374
}
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
379
goto globalfail;
380
}
381
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
556
384
return 0;
557
385
558
386
globalfail:
559
560
gnutls_certificate_free_credentials(mc.cred);
387
388
gnutls_certificate_free_credentials(mc->cred);
561
389
gnutls_global_deinit();
562
gnutls_dh_params_deinit(mc.dh_params);
563
390
return -1;
391
564
392
}
565
393
566
static int init_gnutls_session(gnutls_session_t *session){
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
567
396
int ret;
568
397
/* GnuTLS session creation */
569
do {
570
ret = gnutls_init(session, GNUTLS_SERVER);
571
if(quit_now){
572
return -1;
573
}
574
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
575
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
398
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
578
401
safer_gnutls_strerror(ret));
579
402
}
580
403
581
404
{
582
405
const char *err;
583
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
if(quit_now){
586
gnutls_deinit(*session);
587
return -1;
588
}
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
595
gnutls_deinit(*session);
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf(stderr, "Syntax error at: %s\n", err);
409
fprintf(stderr, "GnuTLS error: %s\n",
410
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
596
412
return -1;
597
413
}
598
414
}
599
415
600
do {
601
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
603
if(quit_now){
604
gnutls_deinit(*session);
605
return -1;
606
}
607
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
608
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
611
420
safer_gnutls_strerror(ret));
612
gnutls_deinit(*session);
421
gnutls_deinit (*session);
613
422
return -1;
614
423
}
615
424
616
425
/* ignore client certificate if any. */
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
618
428
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
620
430
621
431
return 0;
622
432
}
628
438
/* Called when a Mandos server is found */
629
439
static int start_mandos_communication(const char *ip, uint16_t port,
630
440
AvahiIfIndex if_index,
631
int af){
632
int ret, tcp_sd = -1;
633
ssize_t sret;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
441
mandos_context *mc){
442
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
638
444
char *buffer = NULL;
639
char *decrypted_buffer = NULL;
445
char *decrypted_buffer;
640
446
size_t buffer_length = 0;
641
447
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
642
449
size_t written;
643
int retval = -1;
450
int retval = 0;
451
char interface[IF_NAMESIZE];
644
452
gnutls_session_t session;
645
int pf; /* Protocol family */
646
647
errno = 0;
648
649
if(quit_now){
650
errno = EINTR;
651
return -1;
652
}
653
654
switch(af){
655
case AF_INET6:
656
pf = PF_INET6;
657
break;
658
case AF_INET:
659
pf = PF_INET;
660
break;
661
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
664
errno = EINVAL;
665
return -1;
666
}
667
668
ret = init_gnutls_session(&session);
669
if(ret != 0){
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
670
456
return -1;
671
457
}
672
458
673
459
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
676
461
"\n", ip, port);
677
462
}
678
463
679
tcp_sd = socket(pf, SOCK_STREAM, 0);
680
if(tcp_sd < 0){
681
int e = errno;
682
perror_plus("socket");
683
errno = e;
684
goto mandos_end;
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
466
perror("socket");
467
return -1;
685
468
}
686
687
if(quit_now){
688
errno = EINTR;
689
goto mandos_end;
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
473
return -1;
474
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
690
476
}
691
477
692
478
memset(&to, 0, sizeof(to));
693
if(af == AF_INET6){
694
to.in6.sin6_family = (sa_family_t)af;
695
ret = inet_pton(af, ip, &to.in6.sin6_addr);
696
} else { /* IPv4 */
697
to.in.sin_family = (sa_family_t)af;
698
ret = inet_pton(af, ip, &to.in.sin_addr);
699
}
700
if(ret < 0 ){
701
int e = errno;
702
perror_plus("inet_pton");
703
errno = e;
704
goto mandos_end;
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
484
perror("inet_pton");
485
return -1;
705
486
}
706
487
if(ret == 0){
707
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
710
errno = e;
711
goto mandos_end;
712
}
713
if(af == AF_INET6){
714
to.in6.sin6_port = htons(port); /* Spurious warnings from
715
-Wconversion and
716
-Wunreachable-code */
717
718
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
719
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
-Wunreachable-code*/
721
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
724
" without a network interface\n");
725
errno = EINVAL;
726
goto mandos_end;
727
}
728
/* Set the network interface number as scope */
729
to.in6.sin6_scope_id = (uint32_t)if_index;
730
}
731
} else {
732
to.in.sin_port = htons(port); /* Spurious warnings from
733
-Wconversion and
734
-Wunreachable-code */
735
}
488
fprintf(stderr, "Bad address: %s\n", ip);
489
return -1;
490
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
736
492
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
493
to.in6.sin6_scope_id = (uint32_t)if_index;
741
494
742
495
if(debug){
743
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
744
char interface[IF_NAMESIZE];
745
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
perror_plus("if_indextoname");
747
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
751
}
752
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
755
}
756
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
758
const char *pcret;
759
if(af == AF_INET6){
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
761
sizeof(addrstr));
762
} else {
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
764
sizeof(addrstr));
765
}
766
if(pcret == NULL){
767
perror_plus("inet_ntop");
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
501
perror("inet_ntop");
768
502
} else {
769
503
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
504
fprintf(stderr, "Canonical address form: %s\n", addrstr);
772
505
}
773
506
}
774
507
}
775
508
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
if(af == AF_INET6){
782
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
} else {
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
785
}
786
if(ret < 0){
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
int e = errno;
789
perror_plus("connect");
790
errno = e;
791
}
792
goto mandos_end;
793
}
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
798
}
799
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
511
perror("connect");
512
return -1;
513
}
514
800
515
const char *out = mandos_protocol_version;
801
516
written = 0;
802
while(true){
517
while (true){
803
518
size_t out_size = strlen(out);
804
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
805
520
out_size - written));
806
if(ret == -1){
807
int e = errno;
808
perror_plus("write");
809
errno = e;
521
if (ret == -1){
522
perror("write");
523
retval = -1;
810
524
goto mandos_end;
811
525
}
812
526
written += (size_t)ret;
813
527
if(written < out_size){
814
528
continue;
815
529
} else {
816
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
817
531
written = 0;
818
532
out = "\r\n";
819
533
} else {
820
534
break;
821
535
}
822
536
}
823
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
828
537
}
829
538
830
539
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
833
}
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
/* Spurious warning from -Wint-to-pointer-cast */
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
842
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
846
}
847
848
do {
849
ret = gnutls_handshake(session);
850
if(quit_now){
851
errno = EINTR;
852
goto mandos_end;
853
}
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
}
542
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
545
do{
546
ret = gnutls_handshake (session);
854
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
855
548
856
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
857
550
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
860
gnutls_perror(ret);
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
861
553
}
862
errno = EPROTO;
554
retval = -1;
863
555
goto mandos_end;
864
556
}
865
557
866
558
/* Read OpenPGP packet that contains the wanted password */
867
559
868
560
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
ip);
871
563
}
872
564
873
565
while(true){
874
875
if(quit_now){
876
errno = EINTR;
877
goto mandos_end;
878
}
879
880
buffer_capacity = incbuffer(&buffer, buffer_length,
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
881
567
buffer_capacity);
882
if(buffer_capacity == 0){
883
int e = errno;
884
perror_plus("incbuffer");
885
errno = e;
886
goto mandos_end;
887
}
888
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
893
894
sret = gnutls_record_recv(session, buffer+buffer_length,
895
BUFFER_SIZE);
896
if(sret == 0){
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
570
retval = -1;
571
goto mandos_end;
572
}
573
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
897
577
break;
898
578
}
899
if(sret < 0){
900
switch(sret){
579
if (ret < 0){
580
switch(ret){
901
581
case GNUTLS_E_INTERRUPTED:
902
582
case GNUTLS_E_AGAIN:
903
583
break;
904
584
case GNUTLS_E_REHANDSHAKE:
905
do {
906
ret = gnutls_handshake(session);
907
908
if(quit_now){
909
errno = EINTR;
910
goto mandos_end;
911
}
585
do{
586
ret = gnutls_handshake (session);
912
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
916
gnutls_perror(ret);
917
errno = EPROTO;
588
if (ret < 0){
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
591
retval = -1;
918
592
goto mandos_end;
919
593
}
920
594
break;
921
595
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
596
fprintf(stderr, "Unknown error while reading data from"
924
597
" encrypted session with Mandos server\n");
925
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
errno = EIO;
598
retval = -1;
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
927
600
goto mandos_end;
928
601
}
929
602
} else {
930
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
931
604
}
932
605
}
933
606
934
607
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
937
}
938
939
if(quit_now){
940
errno = EINTR;
941
goto mandos_end;
942
}
943
944
do {
945
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
951
952
if(buffer_length > 0){
953
ssize_t decrypted_buffer_size;
608
fprintf(stderr, "Closing TLS session\n");
609
}
610
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
613
if (buffer_length > 0){
954
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
955
615
buffer_length,
956
&decrypted_buffer);
957
if(decrypted_buffer_size >= 0){
958
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
959
619
written = 0;
960
620
while(written < (size_t) decrypted_buffer_size){
961
if(quit_now){
962
errno = EINTR;
963
goto mandos_end;
964
}
965
966
ret = (int)fwrite(decrypted_buffer + written, 1,
967
(size_t)decrypted_buffer_size - written,
968
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
969
624
if(ret == 0 and ferror(stdout)){
970
int e = errno;
971
625
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
626
fprintf(stderr, "Error writing encrypted data: %s\n",
974
627
strerror(errno));
975
628
}
976
errno = e;
977
goto mandos_end;
629
retval = -1;
630
break;
978
631
}
979
632
written += (size_t)ret;
980
633
}
981
retval = 0;
634
free(decrypted_buffer);
635
} else {
636
retval = -1;
982
637
}
638
} else {
639
retval = -1;
983
640
}
984
641
985
642
/* Shutdown procedure */
986
643
987
644
mandos_end:
988
{
989
int e = errno;
990
free(decrypted_buffer);
991
free(buffer);
992
if(tcp_sd >= 0){
993
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
994
}
995
if(ret == -1){
996
if(e == 0){
997
e = errno;
998
}
999
perror_plus("close");
1000
}
1001
gnutls_deinit(session);
1002
errno = e;
1003
if(quit_now){
1004
errno = EINTR;
1005
retval = -1;
1006
}
1007
}
645
free(buffer);
646
close(tcp_sd);
647
gnutls_deinit (session);
1008
648
return retval;
1009
649
}
1010
650
1011
651
static void resolve_callback(AvahiSServiceResolver *r,
1012
652
AvahiIfIndex interface,
1013
AvahiProtocol proto,
653
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1014
654
AvahiResolverEvent event,
1015
655
const char *name,
1016
656
const char *type,
1021
661
AVAHI_GCC_UNUSED AvahiStringList *txt,
1022
662
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1023
663
flags,
1024
AVAHI_GCC_UNUSED void* userdata){
664
void* userdata) {
665
mandos_context *mc = userdata;
1025
666
assert(r);
1026
667
1027
668
/* Called whenever a service has been resolved successfully or
1028
669
timed out */
1029
670
1030
if(quit_now){
1031
return;
1032
}
1033
1034
switch(event){
671
switch (event) {
1035
672
default:
1036
673
case AVAHI_RESOLVER_FAILURE:
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
674
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1039
675
" of type '%s' in domain '%s': %s\n", name, type, domain,
1040
avahi_strerror(avahi_server_errno(mc.server)));
676
avahi_strerror(avahi_server_errno(mc->server)));
1041
677
break;
1042
678
1043
679
case AVAHI_RESOLVER_FOUND:
1045
681
char ip[AVAHI_ADDRESS_STR_MAX];
1046
682
avahi_address_snprint(ip, sizeof(ip), address);
1047
683
if(debug){
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
ip, (intmax_t)interface, port);
684
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
685
PRIu16 ") on port %d\n", name, host_name, ip,
686
interface, port);
1052
687
}
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
1055
if(ret == 0){
1056
avahi_simple_poll_quit(mc.simple_poll);
1057
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
688
int ret = start_mandos_communication(ip, port, interface, mc);
689
if (ret == 0){
690
avahi_simple_poll_quit(mc->simple_poll);
1060
691
}
1061
692
}
1062
693
}
1063
694
avahi_s_service_resolver_free(r);
1064
695
}
1065
696
1066
static void browse_callback(AvahiSServiceBrowser *b,
1067
AvahiIfIndex interface,
1068
AvahiProtocol protocol,
1069
AvahiBrowserEvent event,
1070
const char *name,
1071
const char *type,
1072
const char *domain,
1073
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1074
flags,
1075
AVAHI_GCC_UNUSED void* userdata){
697
static void browse_callback( AvahiSServiceBrowser *b,
698
AvahiIfIndex interface,
699
AvahiProtocol protocol,
700
AvahiBrowserEvent event,
701
const char *name,
702
const char *type,
703
const char *domain,
704
AVAHI_GCC_UNUSED AvahiLookupResultFlags
705
flags,
706
void* userdata) {
707
mandos_context *mc = userdata;
1076
708
assert(b);
1077
709
1078
710
/* Called whenever a new services becomes available on the LAN or
1079
711
is removed from the LAN */
1080
712
1081
if(quit_now){
1082
return;
1083
}
1084
1085
switch(event){
713
switch (event) {
1086
714
default:
1087
715
case AVAHI_BROWSER_FAILURE:
1088
716
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
1091
avahi_strerror(avahi_server_errno(mc.server)));
1092
avahi_simple_poll_quit(mc.simple_poll);
717
fprintf(stderr, "(Avahi browser) %s\n",
718
avahi_strerror(avahi_server_errno(mc->server)));
719
avahi_simple_poll_quit(mc->simple_poll);
1093
720
return;
1094
721
1095
722
case AVAHI_BROWSER_NEW:
1098
725
the callback function is called the Avahi server will free the
1099
726
resolver for us. */
1100
727
1101
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
name, type, domain, protocol, 0,
1103
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
1106
name, avahi_strerror(avahi_server_errno(mc.server)));
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
729
protocol, name, type, domain,
730
AVAHI_PROTO_INET6, 0,
731
resolve_callback, mc)))
732
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
733
name, avahi_strerror(avahi_server_errno(mc->server)));
1107
734
break;
1108
735
1109
736
case AVAHI_BROWSER_REMOVE:
1112
739
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
740
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
741
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
742
fprintf(stderr, "No Mandos server found, still searching...\n");
1117
743
}
1118
744
break;
1119
745
}
1120
746
}
1121
747
1122
/* Signal handler that stops main loop after SIGTERM */
1123
static void handle_sigterm(int sig){
1124
if(quit_now){
1125
return;
1126
}
1127
quit_now = 1;
1128
signal_received = sig;
1129
int old_errno = errno;
1130
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1133
}
1134
errno = old_errno;
1135
}
1136
1137
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
int ret;
1139
1140
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
if(s < 0){
1142
perror_plus("socket");
1143
return false;
1144
}
1145
strcpy(ifr->ifr_name, ifname);
1146
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
if(ret == -1){
1148
if(debug){
1149
perror_plus("ioctl SIOCGIFFLAGS");
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(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", 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(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%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(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%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(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1187
}
1188
return false;
1189
}
1190
1191
/* Accept this device */
1192
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1195
}
1196
return true;
1197
}
1198
1199
/*
1200
* This function determines if a directory entry in /sys/class/net
1201
* corresponds to an acceptable network device.
1202
* (This function is passed to scandir(3) as a filter function.)
1203
*/
1204
int good_interface(const struct dirent *if_entry){
1205
if(if_entry->d_name[0] == '.'){
1206
return 0;
1207
}
1208
1209
struct ifreq ifr;
1210
if(not get_flags(if_entry->d_name, &ifr)){
1211
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1271
int notdotentries(const struct dirent *direntry){
1272
/* Skip "." and ".." */
1273
if(direntry->d_name[0] == '.'
1274
and (direntry->d_name[1] == '\0'
1275
or (direntry->d_name[1] == '.'
1276
and direntry->d_name[2] == '\0'))){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/* Is this directory entry a runnable program? */
1283
int runnable_hook(const struct dirent *direntry){
1284
int ret;
1285
struct stat st;
1286
1287
if((direntry->d_name)[0] == '\0'){
1288
/* Empty name? */
1289
return 0;
1290
}
1291
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
751
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
1311
753
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1317
if(ret == -1){
1318
if(debug){
1319
perror_plus("Could not stat plugin");
1320
}
1321
return 0;
1322
}
1323
if(not (S_ISREG(st.st_mode))){
1324
/* Not a regular file */
1325
return 0;
1326
}
1327
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
/* Not executable */
1329
return 0;
1330
}
1331
return 1;
754
return NULL;
755
}
756
return tmp;
1332
757
}
1333
758
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1335
int ret;
1336
struct timespec now;
1337
struct timespec waited_time;
1338
intmax_t block_time;
1339
1340
while(true){
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1345
}
1346
ret = avahi_simple_poll_iterate(s, -1);
1347
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1352
}
1353
/* the current time */
1354
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1355
if(ret == -1){
1356
perror_plus("clock_gettime");
1357
return -1;
1358
}
1359
/* Calculating in ms how long time between now and server
1360
who we visted longest time ago. Now - last seen. */
1361
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1363
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1365
/* total time is 10s/10,000ms.
1366
Converting to s from ms by dividing by 1,000,
1367
and ns to ms by dividing by 1,000,000. */
1368
block_time = ((retry_interval
1369
- ((intmax_t)waited_time.tv_sec * 1000))
1370
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1375
}
1376
1377
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1382
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1384
return 0;
1385
}
1386
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1388
if(ret == -1){
1389
perror_plus("clock_gettime");
1390
return -1;
1391
}
1392
mc.current_server = mc.current_server->next;
1393
block_time = 0; /* Call avahi to find new Mandos
1394
servers, but don't block */
1395
}
1396
1397
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
}
1399
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1401
return (ret != 1) ? ret : 0;
1402
}
1403
}
1404
}
1405
}
1406
759
1407
760
int main(int argc, char *argv[]){
1408
AvahiSServiceBrowser *sb = NULL;
1409
int error;
1410
int ret;
1411
intmax_t tmpmax;
1412
char *tmp;
1413
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
1415
struct ifreq network;
1416
int sd = -1;
1417
bool take_down_interface = false;
1418
uid_t uid;
1419
gid_t gid;
1420
char tempdir[] = "/tmp/mandosXXXXXX";
1421
bool tempdir_created = false;
1422
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
const char *seckey = PATHDIR "/" SECKEY;
1424
const char *pubkey = PATHDIR "/" PUBKEY;
1425
1426
bool gnutls_initialized = false;
1427
bool gpgme_initialized = false;
1428
float delay = 2.5f;
1429
double retry_interval = 10; /* 10s between trying a server and
1430
retrying the same server again */
1431
1432
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1433
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1434
1435
uid = getuid();
1436
gid = getgid();
1437
1438
/* Lower any group privileges we might have, just to be safe */
1439
errno = 0;
1440
ret = setgid(gid);
1441
if(ret == -1){
1442
perror_plus("setgid");
1443
}
1444
1445
/* Lower user privileges (temporarily) */
1446
errno = 0;
1447
ret = seteuid(uid);
1448
if(ret == -1){
1449
perror_plus("seteuid");
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1456
{
1457
struct argp_option options[] = {
1458
{ .name = "debug", .key = 128,
1459
.doc = "Debug mode", .group = 3 },
1460
{ .name = "connect", .key = 'c',
1461
.arg = "ADDRESS:PORT",
1462
.doc = "Connect directly to a specific Mandos server",
1463
.group = 1 },
1464
{ .name = "interface", .key = 'i',
1465
.arg = "NAME",
1466
.doc = "Network interface that will be used to search for"
1467
" Mandos servers",
1468
.group = 1 },
1469
{ .name = "seckey", .key = 's',
1470
.arg = "FILE",
1471
.doc = "OpenPGP secret key file base name",
1472
.group = 1 },
1473
{ .name = "pubkey", .key = 'p',
1474
.arg = "FILE",
1475
.doc = "OpenPGP public key file base name",
1476
.group = 2 },
1477
{ .name = "dh-bits", .key = 129,
1478
.arg = "BITS",
1479
.doc = "Bit length of the prime number used in the"
1480
" Diffie-Hellman key exchange",
1481
.group = 2 },
1482
{ .name = "priority", .key = 130,
1483
.arg = "STRING",
1484
.doc = "GnuTLS priority string for the TLS handshake",
1485
.group = 1 },
1486
{ .name = "delay", .key = 131,
1487
.arg = "SECONDS",
1488
.doc = "Maximum delay to wait for interface startup",
1489
.group = 2 },
1490
{ .name = "retry", .key = 132,
1491
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1493
.group = 2 },
1494
{ .name = "network-hook-dir", .key = 133,
1495
.arg = "DIR",
1496
.doc = "Directory where network hooks are located",
1497
.group = 2 },
1498
/*
1499
* These reproduce what we would get without ARGP_NO_HELP
1500
*/
1501
{ .name = "help", .key = '?',
1502
.doc = "Give this help list", .group = -1 },
1503
{ .name = "usage", .key = -3,
1504
.doc = "Give a short usage message", .group = -1 },
1505
{ .name = "version", .key = 'V',
1506
.doc = "Print program version", .group = -1 },
1507
{ .name = NULL }
1508
};
1509
1510
error_t parse_opt(int key, char *arg,
1511
struct argp_state *state){
1512
errno = 0;
1513
switch(key){
1514
case 128: /* --debug */
1515
debug = true;
1516
break;
1517
case 'c': /* --connect */
1518
connect_to = arg;
1519
break;
1520
case 'i': /* --interface */
1521
interface = arg;
1522
break;
1523
case 's': /* --seckey */
1524
seckey = arg;
1525
break;
1526
case 'p': /* --pubkey */
1527
pubkey = arg;
1528
break;
1529
case 129: /* --dh-bits */
1530
errno = 0;
1531
tmpmax = strtoimax(arg, &tmp, 10);
1532
if(errno != 0 or tmp == arg or *tmp != '\0'
1533
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1534
argp_error(state, "Bad number of DH bits");
1535
}
1536
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1537
break;
1538
case 130: /* --priority */
1539
mc.priority = arg;
1540
break;
1541
case 131: /* --delay */
1542
errno = 0;
1543
delay = strtof(arg, &tmp);
1544
if(errno != 0 or tmp == arg or *tmp != '\0'){
1545
argp_error(state, "Bad delay");
1546
}
1547
case 132: /* --retry */
1548
errno = 0;
1549
retry_interval = strtod(arg, &tmp);
1550
if(errno != 0 or tmp == arg or *tmp != '\0'
1551
or (retry_interval * 1000) > INT_MAX
1552
or retry_interval < 0){
1553
argp_error(state, "Bad retry interval");
1554
}
1555
break;
1556
case 133: /* --network-hook-dir */
1557
hookdir = arg;
1558
break;
1559
/*
1560
* These reproduce what we would get without ARGP_NO_HELP
1561
*/
1562
case '?': /* --help */
1563
argp_state_help(state, state->out_stream,
1564
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1565
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1566
case -3: /* --usage */
1567
argp_state_help(state, state->out_stream,
1568
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
1572
exit(argp_err_exit_status);
1573
break;
1574
default:
1575
return ARGP_ERR_UNKNOWN;
1576
}
1577
return errno;
1578
}
1579
1580
struct argp argp = { .options = options, .parser = parse_opt,
1581
.args_doc = "",
1582
.doc = "Mandos client -- Get and decrypt"
1583
" passwords from a Mandos server" };
1584
ret = argp_parse(&argp, argc, argv,
1585
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1586
switch(ret){
1587
case 0:
1588
break;
1589
case ENOMEM:
1590
default:
1591
errno = ret;
1592
perror_plus("argp_parse");
1593
exitcode = EX_OSERR;
1594
goto end;
1595
case EINVAL:
1596
exitcode = EX_USAGE;
1597
goto end;
1598
}
1599
}
1600
1601
{
1602
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
761
AvahiSServiceBrowser *sb = NULL;
762
int error;
763
int ret;
764
int exitcode = EXIT_SUCCESS;
765
const char *interface = "eth0";
766
struct ifreq network;
767
int sd;
768
uid_t uid;
769
gid_t gid;
770
char *connect_to = NULL;
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
779
780
{
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
787
.group = 1 },
788
{ .name = "interface", .key = 'i',
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
795
.group = 1 },
796
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
799
.group = 1 },
800
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
803
.group = 2 },
804
{ .name = "dh-bits", .key = 129,
805
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
807
.group = 2 },
808
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
811
{ .name = NULL }
812
};
813
814
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
819
switch (key) {
820
case 128:
821
debug = true;
822
break;
823
case 'c':
824
connect_to = arg;
825
break;
826
case 'i':
827
interface = arg;
828
break;
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
839
errno = 0;
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
if (errno){
842
perror("strtol");
843
exit(EXIT_FAILURE);
844
}
845
break;
846
case 130:
847
mc.priority = arg;
848
break;
849
case ARGP_KEY_ARG:
850
argp_usage (state);
851
case ARGP_KEY_END:
852
break;
853
default:
854
return ARGP_ERR_UNKNOWN;
855
}
856
return 0;
857
}
858
859
struct argp argp = { .options = options, .parser = parse_opt,
860
.args_doc = "",
861
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
866
exitcode = EXIT_FAILURE;
867
goto end;
868
}
869
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
1669
890
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
891
gnutls_initalized = true;
892
}
893
894
/* If the interface is down, bring it up */
895
{
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
if(sd < 0) {
898
perror("socket");
899
exitcode = EXIT_FAILURE;
900
goto end;
901
}
902
strcpy(network.ifr_name, interface);
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
904
if(ret == -1){
905
perror("ioctl SIOCGIFFLAGS");
906
exitcode = EXIT_FAILURE;
907
goto end;
908
}
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
912
if(ret == -1){
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
1748
915
goto end;
1749
916
}
1750
917
}
1751
close(devnull);
1752
}
1753
}
1754
1755
if(not debug){
1756
avahi_set_log_function(empty_log);
1757
}
1758
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1789
goto end;
1790
}
1791
}
1792
1793
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
from the signal handler */
1795
/* Initialize the pseudo-RNG for Avahi */
1796
srand((unsigned int) time(NULL));
1797
mc.simple_poll = avahi_simple_poll_new();
1798
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
1801
exitcode = EX_UNAVAILABLE;
1802
goto end;
1803
}
1804
1805
sigemptyset(&sigterm_action.sa_mask);
1806
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1807
if(ret == -1){
1808
perror_plus("sigaddset");
1809
exitcode = EX_OSERR;
1810
goto end;
1811
}
1812
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1813
if(ret == -1){
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1816
goto end;
1817
}
1818
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1819
if(ret == -1){
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1822
goto end;
1823
}
1824
/* Need to check if the handler is SIG_IGN before handling:
1825
| [[info:libc:Initial Signal Actions]] |
1826
| [[info:libc:Basic Signal Handling]] |
1827
*/
1828
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1829
if(ret == -1){
1830
perror_plus("sigaction");
1831
return EX_OSERR;
1832
}
1833
if(old_sigterm_action.sa_handler != SIG_IGN){
1834
ret = sigaction(SIGINT, &sigterm_action, NULL);
1835
if(ret == -1){
1836
perror_plus("sigaction");
1837
exitcode = EX_OSERR;
1838
goto end;
1839
}
1840
}
1841
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1842
if(ret == -1){
1843
perror_plus("sigaction");
1844
return EX_OSERR;
1845
}
1846
if(old_sigterm_action.sa_handler != SIG_IGN){
1847
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
exitcode = EX_OSERR;
1851
goto end;
1852
}
1853
}
1854
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1855
if(ret == -1){
1856
perror_plus("sigaction");
1857
return EX_OSERR;
1858
}
1859
if(old_sigterm_action.sa_handler != SIG_IGN){
1860
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
exitcode = EX_OSERR;
1864
goto end;
1865
}
1866
}
1867
1868
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
918
close(sd);
919
}
920
921
uid = getuid();
922
gid = getgid();
923
924
ret = setuid(uid);
925
if (ret == -1){
926
perror("setuid");
927
}
928
929
setgid(gid);
930
if (ret == -1){
931
perror("setgid");
932
}
933
1870
934
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
935
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1875
goto end;
1876
}
1877
1878
if(quit_now){
1879
goto end;
1880
}
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
1889
#ifdef __linux__
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
1892
ret = klogctl(8, NULL, 5);
1893
bool restore_loglevel = true;
1894
if(ret == -1){
1895
restore_loglevel = false;
1896
perror_plus("klogctl");
1897
}
1898
#endif /* __linux__ */
1899
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
if(sd < 0){
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1904
#ifdef __linux__
1905
if(restore_loglevel){
1906
ret = klogctl(7, NULL, 0);
1907
if(ret == -1){
1908
perror_plus("klogctl");
1909
}
1910
}
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
1915
if(ret == -1){
1916
perror_plus("seteuid");
1917
}
1918
goto end;
1919
}
1920
strcpy(network.ifr_name, interface);
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
1936
if(ret == -1){
1937
perror_plus("seteuid");
1938
}
1939
goto end;
1940
}
1941
if((network.ifr_flags & IFF_UP) == 0){
1942
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
if(ret == -1){
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1949
#ifdef __linux__
1950
if(restore_loglevel){
1951
ret = klogctl(7, NULL, 0);
1952
if(ret == -1){
1953
perror_plus("klogctl");
1954
}
1955
}
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
1960
if(ret == -1){
1961
perror_plus("seteuid");
1962
}
1963
goto end;
1964
}
1965
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1968
for(int i=0; i < delay * 4; i++){
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1972
} else if(network.ifr_flags & IFF_RUNNING){
1973
break;
1974
}
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
ret = nanosleep(&sleeptime, NULL);
1977
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1979
}
1980
}
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
if(ret == -1){
1985
perror_plus("close");
1986
}
1987
}
1988
#ifdef __linux__
1989
if(restore_loglevel){
1990
/* Restores kernel loglevel to default */
1991
ret = klogctl(7, NULL, 0);
1992
if(ret == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
2012
}
2013
2014
if(quit_now){
2015
goto end;
2016
}
2017
2018
ret = init_gnutls_global(pubkey, seckey);
2019
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2022
exitcode = EX_UNAVAILABLE;
2023
goto end;
2024
} else {
2025
gnutls_initialized = true;
2026
}
2027
2028
if(quit_now){
2029
goto end;
2030
}
2031
2032
if(mkdtemp(tempdir) == NULL){
2033
perror_plus("mkdtemp");
2034
goto end;
2035
}
2036
tempdir_created = true;
2037
2038
if(quit_now){
2039
goto end;
2040
}
2041
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2045
exitcode = EX_UNAVAILABLE;
2046
goto end;
2047
} else {
2048
gpgme_initialized = true;
2049
}
2050
2051
if(quit_now){
2052
goto end;
2053
}
2054
2055
if(connect_to != NULL){
2056
/* Connect directly, do not use Zeroconf */
2057
/* (Mainly meant for debugging) */
2058
char *address = strrchr(connect_to, ':');
2059
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2062
exitcode = EX_USAGE;
2063
goto end;
2064
}
2065
2066
if(quit_now){
2067
goto end;
2068
}
2069
2070
uint16_t port;
2071
errno = 0;
2072
tmpmax = strtoimax(address+1, &tmp, 10);
2073
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2077
exitcode = EX_USAGE;
2078
goto end;
2079
}
2080
2081
if(quit_now){
2082
goto end;
2083
}
2084
2085
port = (uint16_t)tmpmax;
2086
*address = '\0';
2087
/* Colon in address indicates IPv6 */
2088
int af;
2089
if(strchr(connect_to, ':') != NULL){
2090
af = AF_INET6;
2091
/* Accept [] around IPv6 address - see RFC 5952 */
2092
if(connect_to[0] == '[' and address[-1] == ']')
2093
{
2094
connect_to++;
2095
address[-1] = '\0';
2096
}
2097
} else {
2098
af = AF_INET;
2099
}
2100
address = connect_to;
2101
2102
if(quit_now){
2103
goto end;
2104
}
2105
2106
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2108
if(quit_now or ret == 0){
2109
break;
2110
}
2111
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2114
}
2115
sleep((int)retry_interval);
2116
}
2117
2118
if (not quit_now){
2119
exitcode = EXIT_SUCCESS;
2120
}
2121
2122
goto end;
2123
}
2124
2125
if(quit_now){
2126
goto end;
2127
}
2128
2129
{
2130
AvahiServerConfig config;
2131
/* Do not publish any local Zeroconf records */
2132
avahi_server_config_init(&config);
2133
config.publish_hinfo = 0;
2134
config.publish_addresses = 0;
2135
config.publish_workstation = 0;
2136
config.publish_domain = 0;
2137
2138
/* Allocate a new server */
2139
mc.server = avahi_server_new(avahi_simple_poll_get
2140
(mc.simple_poll), &config, NULL,
2141
NULL, &error);
2142
2143
/* Free the Avahi configuration data */
2144
avahi_server_config_free(&config);
2145
}
2146
2147
/* Check if creating the Avahi server object succeeded */
2148
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
2151
avahi_strerror(error));
2152
exitcode = EX_UNAVAILABLE;
2153
goto end;
2154
}
2155
2156
if(quit_now){
2157
goto end;
2158
}
2159
2160
/* Create the Avahi service browser */
2161
sb = avahi_s_service_browser_new(mc.server, if_index,
2162
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
NULL, 0, browse_callback, NULL);
2164
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
2167
avahi_strerror(avahi_server_errno(mc.server)));
2168
exitcode = EX_UNAVAILABLE;
2169
goto end;
2170
}
2171
2172
if(quit_now){
2173
goto end;
2174
}
2175
2176
/* Run the main loop */
2177
2178
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2181
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2185
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
2190
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
937
exit(EXIT_FAILURE);
938
}
939
940
if(connect_to != NULL){
941
/* Connect directly, do not use Zeroconf */
942
/* (Mainly meant for debugging) */
943
char *address = strrchr(connect_to, ':');
944
if(address == NULL){
945
fprintf(stderr, "No colon in address\n");
946
exitcode = EXIT_FAILURE;
947
goto end;
948
}
949
errno = 0;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
953
exitcode = EXIT_FAILURE;
954
goto end;
955
}
956
*address = '\0';
957
address = connect_to;
958
ret = start_mandos_communication(address, port, if_index, &mc);
959
if(ret < 0){
960
exitcode = EXIT_FAILURE;
961
} else {
962
exitcode = EXIT_SUCCESS;
963
}
964
goto end;
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
2191
1029
end:
2192
2193
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
2196
}
2197
2198
/* Cleanup things */
2199
if(sb != NULL)
2200
avahi_s_service_browser_free(sb);
2201
2202
if(mc.server != NULL)
2203
avahi_server_free(mc.server);
2204
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2207
2208
if(gnutls_initialized){
2209
gnutls_certificate_free_credentials(mc.cred);
2210
gnutls_global_deinit();
2211
gnutls_dh_params_deinit(mc.dh_params);
2212
}
2213
2214
if(gpgme_initialized){
2215
gpgme_release(mc.ctx);
2216
}
2217
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2226
}
2227
}
2228
2229
/* XXX run network hooks "stop" here */
2230
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
if(geteuid() == 0){
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2248
}
2249
}
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
if(ret == -1){
2252
perror_plus("close");
2253
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2259
}
2260
}
2261
}
2262
2263
/* Removes the GPGME temp directory and all files inside */
2264
if(tempdir_created){
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
direntry = direntries[i];
2272
char *fullname = NULL;
2273
ret = asprintf(&fullname, "%s/%s", tempdir,
2274
direntry->d_name);
2275
if(ret < 0){
2276
perror_plus("asprintf");
2277
continue;
2278
}
2279
ret = remove(fullname);
2280
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2283
}
2284
free(fullname);
2285
}
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
2292
}
2293
ret = rmdir(tempdir);
2294
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
2296
}
2297
}
2298
2299
if(quit_now){
2300
sigemptyset(&old_sigterm_action.sa_mask);
2301
old_sigterm_action.sa_handler = SIG_DFL;
2302
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2303
&old_sigterm_action,
2304
NULL));
2305
if(ret == -1){
2306
perror_plus("sigaction");
2307
}
2308
do {
2309
ret = raise(signal_received);
2310
} while(ret != 0 and errno == EINTR);
2311
if(ret != 0){
2312
perror_plus("raise");
2313
abort();
2314
}
2315
TEMP_FAILURE_RETRY(pause());
2316
}
2317
2318
return exitcode;
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
2319
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0