To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 531
- compare with another revision
- download diff
- download tarball
- view history from revision 531
- Committer: teddy at bsnet
- Date: 2011-12-24 19:43:48 UTC
- mfrom: (505.1.27 teddy)
- Revision ID: teddy@fukt.bsnet.se-20111224194348-0buonmve2dnwcnzw
Merge from Teddy
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout, ferror() */
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
38
44
#include <stdint.h> /* uint16_t, uint32_t */
39
45
#include <stddef.h> /* NULL, size_t, ssize_t */
40
#include <stdlib.h> /* free() */
41
#include <stdbool.h> /* bool, true */
42
#include <string.h> /* memset(), strcmp(), strlen, strerror() */
43
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
44
SIOCSIFFLAGS */
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 */
45
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
46
sockaddr_in6, PF_INET6, SOCK_STREAM, INET6_ADDRSTRLEN */
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
47
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
48
struct in6_addr, inet_pton(),
49
connect() */
50
#include <assert.h>
51
#include <errno.h> /* perror() */
52
#include <time.h>
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 <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
53
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
54
69
SIOCSIFFLAGS, if_indextoname(),
55
70
if_nametoindex(), IF_NAMESIZE */
56
#include <unistd.h> /* close(), SEEK_SET, off_t, write()*/
57
#include <netinet/in.h>
58
#include <arpa/inet.h> /* inet_pton(), htons */
59
#include <iso646.h> /* not */
60
#include <argp.h> /* struct argp_option,
61
struct argp_state, struct argp,
62
argp_parse() */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
79
#include <argp.h> /* struct argp_option, error_t, struct
80
argp_state, struct argp,
81
argp_parse(), ARGP_KEY_ARG,
82
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
#include <grp.h> /* setgroups() */
91
92
#ifdef __linux__
93
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
63
95
64
96
/* Avahi */
65
#include <avahi-core/core.h> /* AvahiSimplePoll, AvahiServer,
66
AvahiIfIndex */
97
/* All Avahi types, constants and functions
98
Avahi*, avahi_*,
99
AVAHI_* */
100
#include <avahi-core/core.h>
67
101
#include <avahi-core/lookup.h>
68
#include <avahi-core/log.h> /* AvahiLogLevel */
102
#include <avahi-core/log.h>
69
103
#include <avahi-common/simple-watch.h>
70
104
#include <avahi-common/malloc.h>
71
105
#include <avahi-common/error.h>
72
106
73
107
/* GnuTLS */
74
#include <gnutls/gnutls.h> /* gnutls_certificate_credentials_t,
75
gnutls_dh_params_t,
76
gnutls_strerror(),
77
gnutls_global_init(),
78
gnutls_global_set_log_level(),
79
gnutls_global_set_log_function(),
80
gnutls_certificate_allocate_credentials(),
81
gnutls_global_deinit(),
82
gnutls_dh_params_init(),
83
gnutls_dh_params_generate(),
84
gnutls_certificate_set_dh_params(),
85
gnutls_certificate_free_credentials(),
86
gnutls_session_t, gnutls_init(),
87
gnutls_priority_set_direct(),
88
gnutls_deinit(),
89
gnutls_credentials_set(),
90
gnutls_certificate_server_set_request(),
91
gnutls_dh_set_prime_bits(),
92
gnutls_transport_set_ptr(),
93
gnutls_transport_ptr_t,
94
gnutls_handshake(),
95
gnutls_record_recv()
96
gnutls_perror(), gnutls_bye(),
108
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
109
functions:
110
gnutls_*
97
111
init_gnutls_session(),
98
GNUTLS_E_SUCCESS,
99
GNUTLS_CRD_CERTIFICATE,
100
GNUTLS_CERT_IGNORE,
101
GNUTLS_E_INTERRUPTED,
102
GNUTLS_E_AGAIN,
103
GNUTLS_E_REHANDSHAKE,
104
GNUTLS_SHUT_RDWR, */
105
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
106
GNUTLS_OPENPGP_FMT_BASE64 */
112
GNUTLS_* */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
107
116
108
117
/* GPGME */
109
#include <gpgme.h> /* gpgme_data_t, gpgme_ctx_t,
110
gpgme_error_t, gpgme_engine_info_t,
111
gpgme_check_version(),
112
gpgme_engine_check_version(),
113
gpgme_strsource(),
114
gpgme_strerror(),
115
gpgme_get_engine_info(),
116
gpgme_set_engine_info(),
117
gpgme_data_new_from_mem(),
118
gpgme_data_new(), gpgme_new(),
119
gpgme_op_decrypt(),
120
gpgme_decrypt_result_t,
121
gpgme_op_decrypt_result(),
122
gpgme_recipient_t,
123
gpgme_pubkey_algo_name(),
124
gpgme_data_seek(),
125
gpgme_data_read(),
126
gpgme_data_release()
118
#include <gpgme.h> /* All GPGME types, constants and
119
functions:
120
gpgme_*
127
121
GPGME_PROTOCOL_OpenPGP,
128
GPG_ERR_NO_ERROR,
129
GPG_ERR_NO_SECKEY, */
122
GPG_ERR_NO_* */
130
123
131
124
#define BUFFER_SIZE 256
132
125
126
#define PATHDIR "/conf/conf.d/mandos"
127
#define SECKEY "seckey.txt"
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
133
131
bool debug = false;
134
static const char *keydir = "/conf/conf.d/mandos";
135
132
static const char mandos_protocol_version[] = "1";
136
const char *argp_program_version = "mandosclient 0.9";
137
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
133
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
138
149
139
150
/* Used for passing in values through the Avahi callback functions */
140
151
typedef struct {
144
155
unsigned int dh_bits;
145
156
gnutls_dh_params_t dh_params;
146
157
const char *priority;
158
gpgme_ctx_t ctx;
159
server *current_server;
147
160
} mandos_context;
148
161
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
149
187
/*
150
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
151
* "buffer_capacity" is how much is currently allocated,
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
189
* bytes. "buffer_capacity" is how much is currently allocated,
152
190
* "buffer_length" is how much is already used.
153
191
*/
154
size_t adjustbuffer(char **buffer, size_t buffer_length,
155
size_t buffer_capacity){
156
if (buffer_length + BUFFER_SIZE > buffer_capacity){
192
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
157
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
158
if (buffer == NULL){
196
if(buffer == NULL){
159
197
return 0;
160
198
}
161
199
buffer_capacity += BUFFER_SIZE;
163
201
return buffer_capacity;
164
202
}
165
203
204
/* Add server to set of servers to retry periodically */
205
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return false;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return false;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return false;
237
}
238
return true;
239
}
240
166
241
/*
167
* Decrypt OpenPGP data using keyrings in HOMEDIR.
168
* Returns -1 on error
242
* Initialize GPGME.
169
243
*/
170
static ssize_t pgp_packet_decrypt (const char *cryptotext,
171
size_t crypto_size,
172
char **plaintext,
173
const char *homedir){
174
gpgme_data_t dh_crypto, dh_plain;
175
gpgme_ctx_t ctx;
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
176
246
gpgme_error_t rc;
177
ssize_t ret;
178
size_t plaintext_capacity = 0;
179
ssize_t plaintext_length = 0;
180
247
gpgme_engine_info_t engine_info;
181
248
182
if (debug){
183
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
249
250
/*
251
* Helper function to insert pub and seckey to the engine keyring.
252
*/
253
bool import_key(const char *filename){
254
int ret;
255
int fd;
256
gpgme_data_t pgp_data;
257
258
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
259
if(fd == -1){
260
perror_plus("open");
261
return false;
262
}
263
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
268
return false;
269
}
270
271
rc = gpgme_op_import(mc.ctx, pgp_data);
272
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
275
return false;
276
}
277
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
if(ret == -1){
280
perror_plus("close");
281
}
282
gpgme_data_release(pgp_data);
283
return true;
284
}
285
286
if(debug){
287
fprintf_plus(stderr, "Initializing GPGME\n");
184
288
}
185
289
186
290
/* Init GPGME */
187
291
gpgme_check_version(NULL);
188
292
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
189
if (rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
192
return -1;
293
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
296
return false;
193
297
}
194
298
195
299
/* Set GPGME home directory for the OpenPGP engine only */
196
rc = gpgme_get_engine_info (&engine_info);
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
200
return -1;
300
rc = gpgme_get_engine_info(&engine_info);
301
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
304
return false;
201
305
}
202
306
while(engine_info != NULL){
203
307
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
204
308
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
205
engine_info->file_name, homedir);
309
engine_info->file_name, tempdir);
206
310
break;
207
311
}
208
312
engine_info = engine_info->next;
209
313
}
210
314
if(engine_info == NULL){
211
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
212
return -1;
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
317
return false;
318
}
319
320
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
322
if(rc != GPG_ERR_NO_ERROR){
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
326
return false;
327
}
328
329
if(not import_key(pubkey) or not import_key(seckey)){
330
return false;
331
}
332
333
return true;
334
}
335
336
/*
337
* Decrypt OpenPGP data.
338
* Returns -1 on error
339
*/
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
341
size_t crypto_size,
342
char **plaintext){
343
gpgme_data_t dh_crypto, dh_plain;
344
gpgme_error_t rc;
345
ssize_t ret;
346
size_t plaintext_capacity = 0;
347
ssize_t plaintext_length = 0;
348
349
if(debug){
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
213
351
}
214
352
215
353
/* Create new GPGME data buffer from memory cryptotext */
216
354
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
217
355
0);
218
if (rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
356
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
221
359
return -1;
222
360
}
223
361
224
362
/* Create new empty GPGME data buffer for the plaintext */
225
363
rc = gpgme_data_new(&dh_plain);
226
if (rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
364
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
229
368
gpgme_data_release(dh_crypto);
230
369
return -1;
231
370
}
232
371
233
/* Create new GPGME "context" */
234
rc = gpgme_new(&ctx);
235
if (rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
237
gpgme_strsource(rc), gpgme_strerror(rc));
238
plaintext_length = -1;
239
goto decrypt_end;
240
}
241
242
372
/* Decrypt data from the cryptotext data buffer to the plaintext
243
373
data buffer */
244
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
245
if (rc != GPG_ERR_NO_ERROR){
246
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
375
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
248
378
plaintext_length = -1;
249
goto decrypt_end;
250
}
251
252
if(debug){
253
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
254
}
255
256
if (debug){
257
gpgme_decrypt_result_t result;
258
result = gpgme_op_decrypt_result(ctx);
259
if (result == NULL){
260
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
261
} else {
262
fprintf(stderr, "Unsupported algorithm: %s\n",
263
result->unsupported_algorithm);
264
fprintf(stderr, "Wrong key usage: %d\n",
265
result->wrong_key_usage);
266
if(result->file_name != NULL){
267
fprintf(stderr, "File name: %s\n", result->file_name);
268
}
269
gpgme_recipient_t recipient;
270
recipient = result->recipients;
271
if(recipient){
379
if(debug){
380
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
382
if(result == NULL){
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
} else {
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
389
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
391
}
392
gpgme_recipient_t recipient;
393
recipient = result->recipients;
272
394
while(recipient != NULL){
273
fprintf(stderr, "Public key algorithm: %s\n",
274
gpgme_pubkey_algo_name(recipient->pubkey_algo));
275
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
276
fprintf(stderr, "Secret key available: %s\n",
277
recipient->status == GPG_ERR_NO_SECKEY
278
? "No" : "Yes");
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
279
402
recipient = recipient->next;
280
403
}
281
404
}
282
405
}
406
goto decrypt_end;
407
}
408
409
if(debug){
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
283
411
}
284
412
285
413
/* Seek back to the beginning of the GPGME plaintext data buffer */
286
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
287
perror("pgpme_data_seek");
414
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
415
perror_plus("gpgme_data_seek");
288
416
plaintext_length = -1;
289
417
goto decrypt_end;
290
418
}
291
419
292
420
*plaintext = NULL;
293
421
while(true){
294
plaintext_capacity = adjustbuffer(plaintext,
295
(size_t)plaintext_length,
296
plaintext_capacity);
297
if (plaintext_capacity == 0){
298
perror("adjustbuffer");
299
plaintext_length = -1;
300
goto decrypt_end;
422
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
424
plaintext_capacity);
425
if(plaintext_capacity == 0){
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
301
429
}
302
430
303
431
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
304
432
BUFFER_SIZE);
305
433
/* Print the data, if any */
306
if (ret == 0){
434
if(ret == 0){
307
435
/* EOF */
308
436
break;
309
437
}
310
438
if(ret < 0){
311
perror("gpgme_data_read");
439
perror_plus("gpgme_data_read");
312
440
plaintext_length = -1;
313
441
goto decrypt_end;
314
442
}
315
443
plaintext_length += ret;
316
444
}
317
445
318
446
if(debug){
319
fprintf(stderr, "Decrypted password is: ");
447
fprintf_plus(stderr, "Decrypted password is: ");
320
448
for(ssize_t i = 0; i < plaintext_length; i++){
321
449
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
322
450
}
333
461
return plaintext_length;
334
462
}
335
463
336
static const char * safer_gnutls_strerror (int value) {
337
const char *ret = gnutls_strerror (value);
338
if (ret == NULL)
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
467
if(ret == NULL)
339
468
ret = "(unknown)";
340
469
return ret;
341
470
}
343
472
/* GnuTLS log function callback */
344
473
static void debuggnutls(__attribute__((unused)) int level,
345
474
const char* string){
346
fprintf(stderr, "GnuTLS: %s", string);
475
fprintf_plus(stderr, "GnuTLS: %s", string);
347
476
}
348
477
349
static int init_gnutls_global(mandos_context *mc,
350
const char *pubkeyfile,
351
const char *seckeyfile){
478
static int init_gnutls_global(const char *pubkeyfilename,
479
const char *seckeyfilename){
352
480
int ret;
353
481
354
482
if(debug){
355
fprintf(stderr, "Initializing GnuTLS\n");
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
356
484
}
357
358
if ((ret = gnutls_global_init ())
359
!= GNUTLS_E_SUCCESS) {
360
fprintf (stderr, "GnuTLS global_init: %s\n",
361
safer_gnutls_strerror(ret));
485
486
ret = gnutls_global_init();
487
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
362
490
return -1;
363
491
}
364
492
365
if (debug){
493
if(debug){
366
494
/* "Use a log level over 10 to enable all debugging options."
367
495
* - GnuTLS manual
368
496
*/
371
499
}
372
500
373
501
/* OpenPGP credentials */
374
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
375
!= GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "GnuTLS memory error: %s\n",
377
safer_gnutls_strerror(ret));
378
gnutls_global_deinit ();
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
503
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
506
gnutls_global_deinit();
379
507
return -1;
380
508
}
381
509
382
510
if(debug){
383
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
384
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
385
seckeyfile);
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
386
515
}
387
516
388
517
ret = gnutls_certificate_set_openpgp_key_file
389
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf(stderr,
392
"Error[%d] while reading the OpenPGP key pair ('%s',"
393
" '%s')\n", ret, pubkeyfile, seckeyfile);
394
fprintf(stdout, "The GnuTLS error is: %s\n",
395
safer_gnutls_strerror(ret));
518
(mc.cred, pubkeyfilename, seckeyfilename,
519
GNUTLS_OPENPGP_FMT_BASE64);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
396
526
goto globalfail;
397
527
}
398
528
399
529
/* GnuTLS server initialization */
400
ret = gnutls_dh_params_init(&mc->dh_params);
401
if (ret != GNUTLS_E_SUCCESS) {
402
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
403
" %s\n", safer_gnutls_strerror(ret));
404
goto globalfail;
405
}
406
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
409
safer_gnutls_strerror(ret));
410
goto globalfail;
411
}
412
413
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
414
530
ret = gnutls_dh_params_init(&mc.dh_params);
531
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
535
goto globalfail;
536
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
541
goto globalfail;
542
}
543
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
545
415
546
return 0;
416
547
417
548
globalfail:
418
419
gnutls_certificate_free_credentials(mc->cred);
549
550
gnutls_certificate_free_credentials(mc.cred);
420
551
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
421
553
return -1;
422
423
554
}
424
555
425
static int init_gnutls_session(mandos_context *mc,
426
gnutls_session_t *session){
556
static int init_gnutls_session(gnutls_session_t *session){
427
557
int ret;
428
558
/* GnuTLS session creation */
429
ret = gnutls_init(session, GNUTLS_SERVER);
430
if (ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
432
safer_gnutls_strerror(ret));
559
do {
560
ret = gnutls_init(session, GNUTLS_SERVER);
561
if(quit_now){
562
return -1;
563
}
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
565
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
433
569
}
434
570
435
571
{
436
572
const char *err;
437
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
438
if (ret != GNUTLS_E_SUCCESS) {
439
fprintf(stderr, "Syntax error at: %s\n", err);
440
fprintf(stderr, "GnuTLS error: %s\n",
441
safer_gnutls_strerror(ret));
442
gnutls_deinit (*session);
573
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
575
if(quit_now){
576
gnutls_deinit(*session);
577
return -1;
578
}
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
584
gnutls_deinit(*session);
443
585
return -1;
444
586
}
445
587
}
446
588
447
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
448
mc->cred);
449
if (ret != GNUTLS_E_SUCCESS) {
450
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
451
safer_gnutls_strerror(ret));
452
gnutls_deinit (*session);
589
do {
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
592
if(quit_now){
593
gnutls_deinit(*session);
594
return -1;
595
}
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
597
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
600
gnutls_deinit(*session);
453
601
return -1;
454
602
}
455
603
456
604
/* ignore client certificate if any. */
457
gnutls_certificate_server_set_request (*session,
458
GNUTLS_CERT_IGNORE);
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
459
606
460
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
461
608
462
609
return 0;
463
610
}
469
616
/* Called when a Mandos server is found */
470
617
static int start_mandos_communication(const char *ip, uint16_t port,
471
618
AvahiIfIndex if_index,
472
mandos_context *mc){
473
int ret, tcp_sd;
474
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
619
int af){
620
int ret, tcp_sd = -1;
621
ssize_t sret;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
475
626
char *buffer = NULL;
476
char *decrypted_buffer;
627
char *decrypted_buffer = NULL;
477
628
size_t buffer_length = 0;
478
629
size_t buffer_capacity = 0;
479
ssize_t decrypted_buffer_size;
480
630
size_t written;
481
int retval = 0;
482
char interface[IF_NAMESIZE];
631
int retval = -1;
483
632
gnutls_session_t session;
484
485
ret = init_gnutls_session (mc, &session);
486
if (ret != 0){
487
return -1;
488
}
489
490
if(debug){
491
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
492
ip, port);
493
}
494
495
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
496
if(tcp_sd < 0) {
497
perror("socket");
498
return -1;
499
}
500
501
if(debug){
502
if(if_indextoname((unsigned int)if_index, interface) == NULL){
503
perror("if_indextoname");
504
return -1;
505
}
506
fprintf(stderr, "Binding to interface %s\n", interface);
507
}
508
509
memset(&to,0,sizeof(to)); /* Spurious warning */
510
to.in6.sin6_family = AF_INET6;
511
/* It would be nice to have a way to detect if we were passed an
512
IPv4 address here. Now we assume an IPv6 address. */
513
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
514
if (ret < 0 ){
515
perror("inet_pton");
516
return -1;
633
int pf; /* Protocol family */
634
635
errno = 0;
636
637
if(quit_now){
638
errno = EINTR;
639
return -1;
640
}
641
642
switch(af){
643
case AF_INET6:
644
pf = PF_INET6;
645
break;
646
case AF_INET:
647
pf = PF_INET;
648
break;
649
default:
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
651
errno = EINVAL;
652
return -1;
653
}
654
655
ret = init_gnutls_session(&session);
656
if(ret != 0){
657
return -1;
658
}
659
660
if(debug){
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
663
}
664
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
666
if(tcp_sd < 0){
667
int e = errno;
668
perror_plus("socket");
669
errno = e;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
errno = EINTR;
675
goto mandos_end;
676
}
677
678
memset(&to, 0, sizeof(to));
679
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
682
} else { /* IPv4 */
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
685
}
686
if(ret < 0 ){
687
int e = errno;
688
perror_plus("inet_pton");
689
errno = e;
690
goto mandos_end;
517
691
}
518
692
if(ret == 0){
519
fprintf(stderr, "Bad address: %s\n", ip);
520
return -1;
521
}
522
to.in6.sin6_port = htons(port); /* Spurious warning */
693
int e = errno;
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
695
errno = e;
696
goto mandos_end;
697
}
698
if(af == AF_INET6){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
706
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
709
errno = EINVAL;
710
goto mandos_end;
711
}
712
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
714
}
715
} else {
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
719
}
523
720
524
to.in6.sin6_scope_id = (uint32_t)if_index;
721
if(quit_now){
722
errno = EINTR;
723
goto mandos_end;
724
}
525
725
526
726
if(debug){
527
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
528
char addrstr[INET6_ADDRSTRLEN] = "";
529
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
530
sizeof(addrstr)) == NULL){
531
perror("inet_ntop");
727
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
728
char interface[IF_NAMESIZE];
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
perror_plus("if_indextoname");
731
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
734
}
735
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
738
}
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
532
751
} else {
533
752
if(strcmp(addrstr, ip) != 0){
534
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
535
754
}
536
755
}
537
756
}
538
757
539
ret = connect(tcp_sd, &to.in, sizeof(to));
540
if (ret < 0){
541
perror("connect");
542
return -1;
543
}
544
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
768
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
780
}
781
545
782
const char *out = mandos_protocol_version;
546
783
written = 0;
547
while (true){
784
while(true){
548
785
size_t out_size = strlen(out);
549
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
550
out_size - written));
551
if (ret == -1){
552
perror("write");
553
retval = -1;
786
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
787
out_size - written));
788
if(ret == -1){
789
int e = errno;
790
perror_plus("write");
791
errno = e;
554
792
goto mandos_end;
555
793
}
556
794
written += (size_t)ret;
557
795
if(written < out_size){
558
796
continue;
559
797
} else {
560
if (out == mandos_protocol_version){
798
if(out == mandos_protocol_version){
561
799
written = 0;
562
800
out = "\r\n";
563
801
} else {
564
802
break;
565
803
}
566
804
}
805
806
if(quit_now){
807
errno = EINTR;
808
goto mandos_end;
809
}
567
810
}
568
811
569
812
if(debug){
570
fprintf(stderr, "Establishing TLS session with %s\n", ip);
571
}
572
573
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
574
575
ret = gnutls_handshake (session);
576
577
if (ret != GNUTLS_E_SUCCESS){
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
814
}
815
816
if(quit_now){
817
errno = EINTR;
818
goto mandos_end;
819
}
820
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
823
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
828
829
do {
830
ret = gnutls_handshake(session);
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
836
837
if(ret != GNUTLS_E_SUCCESS){
578
838
if(debug){
579
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
580
gnutls_perror (ret);
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
840
gnutls_perror(ret);
581
841
}
582
retval = -1;
842
errno = EPROTO;
583
843
goto mandos_end;
584
844
}
585
845
586
846
/* Read OpenPGP packet that contains the wanted password */
587
847
588
848
if(debug){
589
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
590
ip);
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
591
851
}
592
852
593
853
while(true){
594
buffer_capacity = adjustbuffer(&buffer, buffer_length,
595
buffer_capacity);
596
if (buffer_capacity == 0){
597
perror("adjustbuffer");
598
retval = -1;
599
goto mandos_end;
600
}
601
602
ret = gnutls_record_recv(session, buffer+buffer_length,
603
BUFFER_SIZE);
604
if (ret == 0){
854
855
if(quit_now){
856
errno = EINTR;
857
goto mandos_end;
858
}
859
860
buffer_capacity = incbuffer(&buffer, buffer_length,
861
buffer_capacity);
862
if(buffer_capacity == 0){
863
int e = errno;
864
perror_plus("incbuffer");
865
errno = e;
866
goto mandos_end;
867
}
868
869
if(quit_now){
870
errno = EINTR;
871
goto mandos_end;
872
}
873
874
sret = gnutls_record_recv(session, buffer+buffer_length,
875
BUFFER_SIZE);
876
if(sret == 0){
605
877
break;
606
878
}
607
if (ret < 0){
608
switch(ret){
879
if(sret < 0){
880
switch(sret){
609
881
case GNUTLS_E_INTERRUPTED:
610
882
case GNUTLS_E_AGAIN:
611
883
break;
612
884
case GNUTLS_E_REHANDSHAKE:
613
ret = gnutls_handshake (session);
614
if (ret < 0){
615
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
616
gnutls_perror (ret);
617
retval = -1;
885
do {
886
ret = gnutls_handshake(session);
887
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
if(ret < 0){
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
896
gnutls_perror(ret);
897
errno = EPROTO;
618
898
goto mandos_end;
619
899
}
620
900
break;
621
901
default:
622
fprintf(stderr, "Unknown error while reading data from"
623
" encrypted session with Mandos server\n");
624
retval = -1;
625
gnutls_bye (session, GNUTLS_SHUT_RDWR);
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
904
gnutls_bye(session, GNUTLS_SHUT_RDWR);
905
errno = EIO;
626
906
goto mandos_end;
627
907
}
628
908
} else {
629
buffer_length += (size_t) ret;
909
buffer_length += (size_t) sret;
630
910
}
631
911
}
632
912
633
913
if(debug){
634
fprintf(stderr, "Closing TLS session\n");
635
}
636
637
gnutls_bye (session, GNUTLS_SHUT_RDWR);
638
639
if (buffer_length > 0){
640
decrypted_buffer_size = pgp_packet_decrypt(buffer,
641
buffer_length,
642
&decrypted_buffer,
643
keydir);
644
if (decrypted_buffer_size >= 0){
914
fprintf_plus(stderr, "Closing TLS session\n");
915
}
916
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
do {
923
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
929
930
if(buffer_length > 0){
931
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
933
&decrypted_buffer);
934
if(decrypted_buffer_size >= 0){
935
645
936
written = 0;
646
937
while(written < (size_t) decrypted_buffer_size){
647
ret = (int)fwrite (decrypted_buffer + written, 1,
648
(size_t)decrypted_buffer_size - written,
649
stdout);
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
ret = (int)fwrite(decrypted_buffer + written, 1,
944
(size_t)decrypted_buffer_size - written,
945
stdout);
650
946
if(ret == 0 and ferror(stdout)){
947
int e = errno;
651
948
if(debug){
652
fprintf(stderr, "Error writing encrypted data: %s\n",
653
strerror(errno));
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
654
951
}
655
retval = -1;
656
break;
952
errno = e;
953
goto mandos_end;
657
954
}
658
955
written += (size_t)ret;
659
956
}
660
free(decrypted_buffer);
661
} else {
662
retval = -1;
957
retval = 0;
663
958
}
664
959
}
665
960
666
961
/* Shutdown procedure */
667
962
668
963
mandos_end:
669
free(buffer);
670
close(tcp_sd);
671
gnutls_deinit (session);
964
{
965
int e = errno;
966
free(decrypted_buffer);
967
free(buffer);
968
if(tcp_sd >= 0){
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
970
}
971
if(ret == -1){
972
if(e == 0){
973
e = errno;
974
}
975
perror_plus("close");
976
}
977
gnutls_deinit(session);
978
errno = e;
979
if(quit_now){
980
errno = EINTR;
981
retval = -1;
982
}
983
}
672
984
return retval;
673
985
}
674
986
675
987
static void resolve_callback(AvahiSServiceResolver *r,
676
988
AvahiIfIndex interface,
677
AVAHI_GCC_UNUSED AvahiProtocol protocol,
989
AvahiProtocol proto,
678
990
AvahiResolverEvent event,
679
991
const char *name,
680
992
const char *type,
685
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
686
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
687
999
flags,
688
void* userdata) {
689
mandos_context *mc = userdata;
690
assert(r); /* Spurious warning */
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
691
1002
692
1003
/* Called whenever a service has been resolved successfully or
693
1004
timed out */
694
1005
695
switch (event) {
1006
if(quit_now){
1007
return;
1008
}
1009
1010
switch(event){
696
1011
default:
697
1012
case AVAHI_RESOLVER_FAILURE:
698
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
699
" of type '%s' in domain '%s': %s\n", name, type, domain,
700
avahi_strerror(avahi_server_errno(mc->server)));
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
701
1017
break;
702
1018
703
1019
case AVAHI_RESOLVER_FOUND:
705
1021
char ip[AVAHI_ADDRESS_STR_MAX];
706
1022
avahi_address_snprint(ip, sizeof(ip), address);
707
1023
if(debug){
708
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
709
" port %d\n", name, host_name, ip, interface, port);
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
710
1027
}
711
int ret = start_mandos_communication(ip, port, interface, mc);
712
if (ret == 0){
713
exit(EXIT_SUCCESS);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1030
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1032
} else {
1033
if(not add_server(ip, port, interface,
1034
avahi_proto_to_af(proto))){
1035
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1036
" list\n", name);
1037
}
714
1038
}
715
1039
}
716
1040
}
717
1041
avahi_s_service_resolver_free(r);
718
1042
}
719
1043
720
static void browse_callback( AvahiSServiceBrowser *b,
721
AvahiIfIndex interface,
722
AvahiProtocol protocol,
723
AvahiBrowserEvent event,
724
const char *name,
725
const char *type,
726
const char *domain,
727
AVAHI_GCC_UNUSED AvahiLookupResultFlags
728
flags,
729
void* userdata) {
730
mandos_context *mc = userdata;
731
assert(b); /* Spurious warning */
1044
static void browse_callback(AvahiSServiceBrowser *b,
1045
AvahiIfIndex interface,
1046
AvahiProtocol protocol,
1047
AvahiBrowserEvent event,
1048
const char *name,
1049
const char *type,
1050
const char *domain,
1051
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1052
flags,
1053
AVAHI_GCC_UNUSED void* userdata){
1054
assert(b);
732
1055
733
1056
/* Called whenever a new services becomes available on the LAN or
734
1057
is removed from the LAN */
735
1058
736
switch (event) {
1059
if(quit_now){
1060
return;
1061
}
1062
1063
switch(event){
737
1064
default:
738
1065
case AVAHI_BROWSER_FAILURE:
739
1066
740
fprintf(stderr, "(Avahi browser) %s\n",
741
avahi_strerror(avahi_server_errno(mc->server)));
742
avahi_simple_poll_quit(mc->simple_poll);
1067
fprintf_plus(stderr, "(Avahi browser) %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
avahi_simple_poll_quit(mc.simple_poll);
743
1070
return;
744
1071
745
1072
case AVAHI_BROWSER_NEW:
748
1075
the callback function is called the Avahi server will free the
749
1076
resolver for us. */
750
1077
751
if (!(avahi_s_service_resolver_new(mc->server, interface,
752
protocol, name, type, domain,
753
AVAHI_PROTO_INET6, 0,
754
resolve_callback, mc)))
755
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
756
name, avahi_strerror(avahi_server_errno(mc->server)));
1078
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1079
name, type, domain, protocol, 0,
1080
resolve_callback, NULL) == NULL)
1081
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1082
" %s\n", name,
1083
avahi_strerror(avahi_server_errno(mc.server)));
757
1084
break;
758
1085
759
1086
case AVAHI_BROWSER_REMOVE:
762
1089
case AVAHI_BROWSER_ALL_FOR_NOW:
763
1090
case AVAHI_BROWSER_CACHE_EXHAUSTED:
764
1091
if(debug){
765
fprintf(stderr, "No Mandos server found, still searching...\n");
1092
fprintf_plus(stderr, "No Mandos server found, still"
1093
" searching...\n");
766
1094
}
767
1095
break;
768
1096
}
769
1097
}
770
1098
771
/* Combines file name and path and returns the malloced new
772
string. some sane checks could/should be added */
773
static const char *combinepath(const char *first, const char *second){
774
size_t f_len = strlen(first);
775
size_t s_len = strlen(second);
776
char *tmp = malloc(f_len + s_len + 2);
777
if (tmp == NULL){
778
return NULL;
779
}
780
if(f_len > 0){
781
memcpy(tmp, first, f_len); /* Spurious warning */
782
}
783
tmp[f_len] = '/';
784
if(s_len > 0){
785
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
786
}
787
tmp[f_len + 1 + s_len] = '\0';
788
return tmp;
789
}
790
1099
/* Signal handler that stops main loop after SIGTERM */
1100
static void handle_sigterm(int sig){
1101
if(quit_now){
1102
return;
1103
}
1104
quit_now = 1;
1105
signal_received = sig;
1106
int old_errno = errno;
1107
/* set main loop to exit */
1108
if(mc.simple_poll != NULL){
1109
avahi_simple_poll_quit(mc.simple_poll);
1110
}
1111
errno = old_errno;
1112
}
1113
1114
bool get_flags(const char *ifname, struct ifreq *ifr){
1115
int ret;
1116
1117
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1118
if(s < 0){
1119
perror_plus("socket");
1120
return false;
1121
}
1122
strcpy(ifr->ifr_name, ifname);
1123
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1124
if(ret == -1){
1125
if(debug){
1126
perror_plus("ioctl SIOCGIFFLAGS");
1127
}
1128
return false;
1129
}
1130
return true;
1131
}
1132
1133
bool good_flags(const char *ifname, const struct ifreq *ifr){
1134
1135
/* Reject the loopback device */
1136
if(ifr->ifr_flags & IFF_LOOPBACK){
1137
if(debug){
1138
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1139
ifname);
1140
}
1141
return false;
1142
}
1143
/* Accept point-to-point devices only if connect_to is specified */
1144
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1145
if(debug){
1146
fprintf_plus(stderr, "Accepting point-to-point interface"
1147
" \"%s\"\n", ifname);
1148
}
1149
return true;
1150
}
1151
/* Otherwise, reject non-broadcast-capable devices */
1152
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1153
if(debug){
1154
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1155
" \"%s\"\n", ifname);
1156
}
1157
return false;
1158
}
1159
/* Reject non-ARP interfaces (including dummy interfaces) */
1160
if(ifr->ifr_flags & IFF_NOARP){
1161
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1163
ifname);
1164
}
1165
return false;
1166
}
1167
1168
/* Accept this device */
1169
if(debug){
1170
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1171
}
1172
return true;
1173
}
1174
1175
/*
1176
* This function determines if a directory entry in /sys/class/net
1177
* corresponds to an acceptable network device.
1178
* (This function is passed to scandir(3) as a filter function.)
1179
*/
1180
int good_interface(const struct dirent *if_entry){
1181
if(if_entry->d_name[0] == '.'){
1182
return 0;
1183
}
1184
1185
struct ifreq ifr;
1186
if(not get_flags(if_entry->d_name, &ifr)){
1187
if(debug){
1188
fprintf_plus(stderr, "Failed to get flags for interface "
1189
"\"%s\"\n", if_entry->d_name);
1190
}
1191
return 0;
1192
}
1193
1194
if(not good_flags(if_entry->d_name, &ifr)){
1195
return 0;
1196
}
1197
return 1;
1198
}
1199
1200
/*
1201
* This function determines if a directory entry in /sys/class/net
1202
* corresponds to an acceptable network device which is up.
1203
* (This function is passed to scandir(3) as a filter function.)
1204
*/
1205
int up_interface(const struct dirent *if_entry){
1206
if(if_entry->d_name[0] == '.'){
1207
return 0;
1208
}
1209
1210
struct ifreq ifr;
1211
if(not get_flags(if_entry->d_name, &ifr)){
1212
if(debug){
1213
fprintf_plus(stderr, "Failed to get flags for interface "
1214
"\"%s\"\n", if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
/* Reject down interfaces */
1220
if(not (ifr.ifr_flags & IFF_UP)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1223
if_entry->d_name);
1224
}
1225
return 0;
1226
}
1227
1228
/* Reject non-running interfaces */
1229
if(not (ifr.ifr_flags & IFF_RUNNING)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1232
if_entry->d_name);
1233
}
1234
return 0;
1235
}
1236
1237
if(not good_flags(if_entry->d_name, &ifr)){
1238
return 0;
1239
}
1240
return 1;
1241
}
1242
1243
int notdotentries(const struct dirent *direntry){
1244
/* Skip "." and ".." */
1245
if(direntry->d_name[0] == '.'
1246
and (direntry->d_name[1] == '\0'
1247
or (direntry->d_name[1] == '.'
1248
and direntry->d_name[2] == '\0'))){
1249
return 0;
1250
}
1251
return 1;
1252
}
1253
1254
/* Is this directory entry a runnable program? */
1255
int runnable_hook(const struct dirent *direntry){
1256
int ret;
1257
size_t sret;
1258
struct stat st;
1259
1260
if((direntry->d_name)[0] == '\0'){
1261
/* Empty name? */
1262
return 0;
1263
}
1264
1265
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1266
"abcdefghijklmnopqrstuvwxyz"
1267
"0123456789"
1268
"_-");
1269
if((direntry->d_name)[sret] != '\0'){
1270
/* Contains non-allowed characters */
1271
if(debug){
1272
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1273
direntry->d_name);
1274
}
1275
return 0;
1276
}
1277
1278
char *fullname = NULL;
1279
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1280
if(ret < 0){
1281
perror_plus("asprintf");
1282
return 0;
1283
}
1284
1285
ret = stat(fullname, &st);
1286
if(ret == -1){
1287
if(debug){
1288
perror_plus("Could not stat hook");
1289
}
1290
return 0;
1291
}
1292
if(not (S_ISREG(st.st_mode))){
1293
/* Not a regular file */
1294
if(debug){
1295
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1296
direntry->d_name);
1297
}
1298
return 0;
1299
}
1300
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1301
/* Not executable */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(debug){
1309
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1310
direntry->d_name);
1311
}
1312
return 1;
1313
}
1314
1315
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1316
int ret;
1317
struct timespec now;
1318
struct timespec waited_time;
1319
intmax_t block_time;
1320
1321
while(true){
1322
if(mc.current_server == NULL){
1323
if (debug){
1324
fprintf_plus(stderr, "Wait until first server is found."
1325
" No timeout!\n");
1326
}
1327
ret = avahi_simple_poll_iterate(s, -1);
1328
} else {
1329
if (debug){
1330
fprintf_plus(stderr, "Check current_server if we should run"
1331
" it, or wait\n");
1332
}
1333
/* the current time */
1334
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1335
if(ret == -1){
1336
perror_plus("clock_gettime");
1337
return -1;
1338
}
1339
/* Calculating in ms how long time between now and server
1340
who we visted longest time ago. Now - last seen. */
1341
waited_time.tv_sec = (now.tv_sec
1342
- mc.current_server->last_seen.tv_sec);
1343
waited_time.tv_nsec = (now.tv_nsec
1344
- mc.current_server->last_seen.tv_nsec);
1345
/* total time is 10s/10,000ms.
1346
Converting to s from ms by dividing by 1,000,
1347
and ns to ms by dividing by 1,000,000. */
1348
block_time = ((retry_interval
1349
- ((intmax_t)waited_time.tv_sec * 1000))
1350
- ((intmax_t)waited_time.tv_nsec / 1000000));
1351
1352
if (debug){
1353
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
block_time);
1355
}
1356
1357
if(block_time <= 0){
1358
ret = start_mandos_communication(mc.current_server->ip,
1359
mc.current_server->port,
1360
mc.current_server->if_index,
1361
mc.current_server->af);
1362
if(ret == 0){
1363
avahi_simple_poll_quit(mc.simple_poll);
1364
return 0;
1365
}
1366
ret = clock_gettime(CLOCK_MONOTONIC,
1367
&mc.current_server->last_seen);
1368
if(ret == -1){
1369
perror_plus("clock_gettime");
1370
return -1;
1371
}
1372
mc.current_server = mc.current_server->next;
1373
block_time = 0; /* Call avahi to find new Mandos
1374
servers, but don't block */
1375
}
1376
1377
ret = avahi_simple_poll_iterate(s, (int)block_time);
1378
}
1379
if(ret != 0){
1380
if (ret > 0 or errno != EINTR){
1381
return (ret != 1) ? ret : 0;
1382
}
1383
}
1384
}
1385
}
1386
1387
bool run_network_hooks(const char *mode, const char *interface,
1388
const float delay){
1389
struct dirent **direntries;
1390
struct dirent *direntry;
1391
int ret;
1392
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1393
alphasort);
1394
if(numhooks == -1){
1395
perror_plus("scandir");
1396
} else {
1397
int devnull = open("/dev/null", O_RDONLY);
1398
for(int i = 0; i < numhooks; i++){
1399
direntry = direntries[i];
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1402
if(ret < 0){
1403
perror_plus("asprintf");
1404
continue;
1405
}
1406
if(debug){
1407
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1408
direntry->d_name);
1409
}
1410
pid_t hook_pid = fork();
1411
if(hook_pid == 0){
1412
/* Child */
1413
/* Raise privileges */
1414
errno = 0;
1415
ret = seteuid(0);
1416
if(ret == -1){
1417
perror_plus("seteuid");
1418
}
1419
/* Raise privileges even more */
1420
errno = 0;
1421
ret = setuid(0);
1422
if(ret == -1){
1423
perror_plus("setuid");
1424
}
1425
/* Set group */
1426
errno = 0;
1427
ret = setgid(0);
1428
if(ret == -1){
1429
perror_plus("setgid");
1430
}
1431
/* Reset supplementary groups */
1432
errno = 0;
1433
ret = setgroups(0, NULL);
1434
if(ret == -1){
1435
perror_plus("setgroups");
1436
}
1437
dup2(devnull, STDIN_FILENO);
1438
close(devnull);
1439
dup2(STDERR_FILENO, STDOUT_FILENO);
1440
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
if(ret == -1){
1442
perror_plus("setenv");
1443
_exit(EX_OSERR);
1444
}
1445
ret = setenv("DEVICE", interface, 1);
1446
if(ret == -1){
1447
perror_plus("setenv");
1448
_exit(EX_OSERR);
1449
}
1450
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1451
if(ret == -1){
1452
perror_plus("setenv");
1453
_exit(EX_OSERR);
1454
}
1455
ret = setenv("MODE", mode, 1);
1456
if(ret == -1){
1457
perror_plus("setenv");
1458
_exit(EX_OSERR);
1459
}
1460
char *delaystring;
1461
ret = asprintf(&delaystring, "%f", delay);
1462
if(ret == -1){
1463
perror_plus("asprintf");
1464
_exit(EX_OSERR);
1465
}
1466
ret = setenv("DELAY", delaystring, 1);
1467
if(ret == -1){
1468
free(delaystring);
1469
perror_plus("setenv");
1470
_exit(EX_OSERR);
1471
}
1472
free(delaystring);
1473
ret = execl(fullname, direntry->d_name, mode, NULL);
1474
perror_plus("execl");
1475
} else {
1476
int status;
1477
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1478
perror_plus("waitpid");
1479
free(fullname);
1480
continue;
1481
}
1482
if(WIFEXITED(status)){
1483
if(WEXITSTATUS(status) != 0){
1484
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1485
" with status %d\n", direntry->d_name,
1486
WEXITSTATUS(status));
1487
free(fullname);
1488
continue;
1489
}
1490
} else if(WIFSIGNALED(status)){
1491
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1494
free(fullname);
1495
continue;
1496
} else {
1497
fprintf_plus(stderr, "Warning: network hook \"%s\""
1498
" crashed\n", direntry->d_name);
1499
free(fullname);
1500
continue;
1501
}
1502
}
1503
free(fullname);
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1506
direntry->d_name);
1507
}
1508
}
1509
close(devnull);
1510
}
1511
return true;
1512
}
791
1513
792
1514
int main(int argc, char *argv[]){
793
AvahiSServiceBrowser *sb = NULL;
794
int error;
795
int ret;
796
int exitcode = EXIT_SUCCESS;
797
const char *interface = "eth0";
798
struct ifreq network;
799
int sd;
800
uid_t uid;
801
gid_t gid;
802
char *connect_to = NULL;
803
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
804
const char *pubkeyfile = "pubkey.txt";
805
const char *seckeyfile = "seckey.txt";
806
mandos_context mc = { .simple_poll = NULL, .server = NULL,
807
.dh_bits = 1024, .priority = "SECURE256"};
808
bool gnutls_initalized = false;
809
810
{
811
struct argp_option options[] = {
812
{ .name = "debug", .key = 128,
813
.doc = "Debug mode", .group = 3 },
814
{ .name = "connect", .key = 'c',
815
.arg = "IP",
816
.doc = "Connect directly to a sepcified mandos server",
817
.group = 1 },
818
{ .name = "interface", .key = 'i',
819
.arg = "INTERFACE",
820
.doc = "Interface that Avahi will conntect through",
821
.group = 1 },
822
{ .name = "keydir", .key = 'd',
823
.arg = "KEYDIR",
824
.doc = "Directory where the openpgp keyring is",
825
.group = 1 },
826
{ .name = "seckey", .key = 's',
827
.arg = "SECKEY",
828
.doc = "Secret openpgp key for gnutls authentication",
829
.group = 1 },
830
{ .name = "pubkey", .key = 'p',
831
.arg = "PUBKEY",
832
.doc = "Public openpgp key for gnutls authentication",
833
.group = 2 },
834
{ .name = "dh-bits", .key = 129,
835
.arg = "BITS",
836
.doc = "dh-bits to use in gnutls communication",
837
.group = 2 },
838
{ .name = "priority", .key = 130,
839
.arg = "PRIORITY",
840
.doc = "GNUTLS priority", .group = 1 },
841
{ .name = NULL }
842
};
843
844
845
error_t parse_opt (int key, char *arg,
846
struct argp_state *state) {
847
/* Get the INPUT argument from `argp_parse', which we know is
848
a pointer to our plugin list pointer. */
849
switch (key) {
850
case 128:
851
debug = true;
852
break;
853
case 'c':
854
connect_to = arg;
855
break;
856
case 'i':
857
interface = arg;
858
break;
859
case 'd':
860
keydir = arg;
861
break;
862
case 's':
863
seckeyfile = arg;
864
break;
865
case 'p':
866
pubkeyfile = arg;
867
break;
868
case 129:
869
errno = 0;
870
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
871
if (errno){
872
perror("strtol");
873
exit(EXIT_FAILURE);
874
}
875
break;
876
case 130:
877
mc.priority = arg;
878
break;
879
case ARGP_KEY_ARG:
880
argp_usage (state);
881
break;
882
case ARGP_KEY_END:
883
break;
884
default:
885
return ARGP_ERR_UNKNOWN;
886
}
887
return 0;
888
}
889
890
struct argp argp = { .options = options, .parser = parse_opt,
891
.args_doc = "",
892
.doc = "Mandos client -- Get and decrypt"
893
" passwords from mandos server" };
894
argp_parse (&argp, argc, argv, 0, 0, NULL);
895
}
896
897
pubkeyfile = combinepath(keydir, pubkeyfile);
898
if (pubkeyfile == NULL){
899
perror("combinepath");
1515
AvahiSServiceBrowser *sb = NULL;
1516
int error;
1517
int ret;
1518
intmax_t tmpmax;
1519
char *tmp;
1520
int exitcode = EXIT_SUCCESS;
1521
const char *interface = "";
1522
struct ifreq network;
1523
int sd = -1;
1524
bool take_down_interface = false;
1525
uid_t uid;
1526
gid_t gid;
1527
char tempdir[] = "/tmp/mandosXXXXXX";
1528
bool tempdir_created = false;
1529
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1530
const char *seckey = PATHDIR "/" SECKEY;
1531
const char *pubkey = PATHDIR "/" PUBKEY;
1532
1533
bool gnutls_initialized = false;
1534
bool gpgme_initialized = false;
1535
float delay = 2.5f;
1536
double retry_interval = 10; /* 10s between trying a server and
1537
retrying the same server again */
1538
1539
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1540
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1541
1542
uid = getuid();
1543
gid = getgid();
1544
1545
/* Lower any group privileges we might have, just to be safe */
1546
errno = 0;
1547
ret = setgid(gid);
1548
if(ret == -1){
1549
perror_plus("setgid");
1550
}
1551
1552
/* Lower user privileges (temporarily) */
1553
errno = 0;
1554
ret = seteuid(uid);
1555
if(ret == -1){
1556
perror_plus("seteuid");
1557
}
1558
1559
if(quit_now){
1560
goto end;
1561
}
1562
1563
{
1564
struct argp_option options[] = {
1565
{ .name = "debug", .key = 128,
1566
.doc = "Debug mode", .group = 3 },
1567
{ .name = "connect", .key = 'c',
1568
.arg = "ADDRESS:PORT",
1569
.doc = "Connect directly to a specific Mandos server",
1570
.group = 1 },
1571
{ .name = "interface", .key = 'i',
1572
.arg = "NAME",
1573
.doc = "Network interface that will be used to search for"
1574
" Mandos servers",
1575
.group = 1 },
1576
{ .name = "seckey", .key = 's',
1577
.arg = "FILE",
1578
.doc = "OpenPGP secret key file base name",
1579
.group = 1 },
1580
{ .name = "pubkey", .key = 'p',
1581
.arg = "FILE",
1582
.doc = "OpenPGP public key file base name",
1583
.group = 2 },
1584
{ .name = "dh-bits", .key = 129,
1585
.arg = "BITS",
1586
.doc = "Bit length of the prime number used in the"
1587
" Diffie-Hellman key exchange",
1588
.group = 2 },
1589
{ .name = "priority", .key = 130,
1590
.arg = "STRING",
1591
.doc = "GnuTLS priority string for the TLS handshake",
1592
.group = 1 },
1593
{ .name = "delay", .key = 131,
1594
.arg = "SECONDS",
1595
.doc = "Maximum delay to wait for interface startup",
1596
.group = 2 },
1597
{ .name = "retry", .key = 132,
1598
.arg = "SECONDS",
1599
.doc = "Retry interval used when denied by the mandos server",
1600
.group = 2 },
1601
{ .name = "network-hook-dir", .key = 133,
1602
.arg = "DIR",
1603
.doc = "Directory where network hooks are located",
1604
.group = 2 },
1605
/*
1606
* These reproduce what we would get without ARGP_NO_HELP
1607
*/
1608
{ .name = "help", .key = '?',
1609
.doc = "Give this help list", .group = -1 },
1610
{ .name = "usage", .key = -3,
1611
.doc = "Give a short usage message", .group = -1 },
1612
{ .name = "version", .key = 'V',
1613
.doc = "Print program version", .group = -1 },
1614
{ .name = NULL }
1615
};
1616
1617
error_t parse_opt(int key, char *arg,
1618
struct argp_state *state){
1619
errno = 0;
1620
switch(key){
1621
case 128: /* --debug */
1622
debug = true;
1623
break;
1624
case 'c': /* --connect */
1625
connect_to = arg;
1626
break;
1627
case 'i': /* --interface */
1628
interface = arg;
1629
break;
1630
case 's': /* --seckey */
1631
seckey = arg;
1632
break;
1633
case 'p': /* --pubkey */
1634
pubkey = arg;
1635
break;
1636
case 129: /* --dh-bits */
1637
errno = 0;
1638
tmpmax = strtoimax(arg, &tmp, 10);
1639
if(errno != 0 or tmp == arg or *tmp != '\0'
1640
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1641
argp_error(state, "Bad number of DH bits");
1642
}
1643
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1644
break;
1645
case 130: /* --priority */
1646
mc.priority = arg;
1647
break;
1648
case 131: /* --delay */
1649
errno = 0;
1650
delay = strtof(arg, &tmp);
1651
if(errno != 0 or tmp == arg or *tmp != '\0'){
1652
argp_error(state, "Bad delay");
1653
}
1654
case 132: /* --retry */
1655
errno = 0;
1656
retry_interval = strtod(arg, &tmp);
1657
if(errno != 0 or tmp == arg or *tmp != '\0'
1658
or (retry_interval * 1000) > INT_MAX
1659
or retry_interval < 0){
1660
argp_error(state, "Bad retry interval");
1661
}
1662
break;
1663
case 133: /* --network-hook-dir */
1664
hookdir = arg;
1665
break;
1666
/*
1667
* These reproduce what we would get without ARGP_NO_HELP
1668
*/
1669
case '?': /* --help */
1670
argp_state_help(state, state->out_stream,
1671
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1672
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1673
case -3: /* --usage */
1674
argp_state_help(state, state->out_stream,
1675
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1676
case 'V': /* --version */
1677
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1678
exit(argp_err_exit_status);
1679
break;
1680
default:
1681
return ARGP_ERR_UNKNOWN;
1682
}
1683
return errno;
1684
}
1685
1686
struct argp argp = { .options = options, .parser = parse_opt,
1687
.args_doc = "",
1688
.doc = "Mandos client -- Get and decrypt"
1689
" passwords from a Mandos server" };
1690
ret = argp_parse(&argp, argc, argv,
1691
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1692
switch(ret){
1693
case 0:
1694
break;
1695
case ENOMEM:
1696
default:
1697
errno = ret;
1698
perror_plus("argp_parse");
1699
exitcode = EX_OSERR;
1700
goto end;
1701
case EINVAL:
1702
exitcode = EX_USAGE;
1703
goto end;
1704
}
1705
}
1706
1707
{
1708
/* Work around Debian bug #633582:
1709
<http://bugs.debian.org/633582> */
1710
1711
/* Re-raise priviliges */
1712
errno = 0;
1713
ret = seteuid(0);
1714
if(ret == -1){
1715
perror_plus("seteuid");
1716
} else {
1717
struct stat st;
1718
1719
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1720
int seckey_fd = open(seckey, O_RDONLY);
1721
if(seckey_fd == -1){
1722
perror_plus("open");
1723
} else {
1724
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1725
if(ret == -1){
1726
perror_plus("fstat");
1727
} else {
1728
if(S_ISREG(st.st_mode)
1729
and st.st_uid == 0 and st.st_gid == 0){
1730
ret = fchown(seckey_fd, uid, gid);
1731
if(ret == -1){
1732
perror_plus("fchown");
1733
}
1734
}
1735
}
1736
TEMP_FAILURE_RETRY(close(seckey_fd));
1737
}
1738
}
1739
1740
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1741
int pubkey_fd = open(pubkey, O_RDONLY);
1742
if(pubkey_fd == -1){
1743
perror_plus("open");
1744
} else {
1745
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
if(ret == -1){
1747
perror_plus("fstat");
1748
} else {
1749
if(S_ISREG(st.st_mode)
1750
and st.st_uid == 0 and st.st_gid == 0){
1751
ret = fchown(pubkey_fd, uid, gid);
1752
if(ret == -1){
1753
perror_plus("fchown");
1754
}
1755
}
1756
}
1757
TEMP_FAILURE_RETRY(close(pubkey_fd));
1758
}
1759
}
1760
1761
/* Lower privileges */
1762
errno = 0;
1763
ret = seteuid(uid);
1764
if(ret == -1){
1765
perror_plus("seteuid");
1766
}
1767
}
1768
}
1769
1770
/* Run network hooks */
1771
if(not run_network_hooks("start", interface, delay)){
1772
goto end;
1773
}
1774
1775
if(not debug){
1776
avahi_set_log_function(empty_log);
1777
}
1778
1779
if(interface[0] == '\0'){
1780
struct dirent **direntries;
1781
/* First look for interfaces that are up */
1782
ret = scandir(sys_class_net, &direntries, up_interface,
1783
alphasort);
1784
if(ret == 0){
1785
/* No up interfaces, look for any good interfaces */
1786
free(direntries);
1787
ret = scandir(sys_class_net, &direntries, good_interface,
1788
alphasort);
1789
}
1790
if(ret >= 1){
1791
/* Pick the first interface returned */
1792
interface = strdup(direntries[0]->d_name);
1793
if(debug){
1794
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf_plus(stderr, "Could not find a network interface\n");
900
1806
exitcode = EXIT_FAILURE;
901
1807
goto end;
902
1808
}
903
904
seckeyfile = combinepath(keydir, seckeyfile);
905
if (seckeyfile == NULL){
906
perror("combinepath");
907
goto end;
908
}
909
910
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
911
if (ret == -1){
912
fprintf(stderr, "init_gnutls_global\n");
913
goto end;
914
} else {
915
gnutls_initalized = true;
916
}
917
918
uid = getuid();
919
gid = getgid();
920
921
ret = setuid(uid);
922
if (ret == -1){
923
perror("setuid");
924
}
925
926
setgid(gid);
927
if (ret == -1){
928
perror("setgid");
929
}
930
1809
}
1810
1811
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1812
from the signal handler */
1813
/* Initialize the pseudo-RNG for Avahi */
1814
srand((unsigned int) time(NULL));
1815
mc.simple_poll = avahi_simple_poll_new();
1816
if(mc.simple_poll == NULL){
1817
fprintf_plus(stderr,
1818
"Avahi: Failed to create simple poll object.\n");
1819
exitcode = EX_UNAVAILABLE;
1820
goto end;
1821
}
1822
1823
sigemptyset(&sigterm_action.sa_mask);
1824
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1825
if(ret == -1){
1826
perror_plus("sigaddset");
1827
exitcode = EX_OSERR;
1828
goto end;
1829
}
1830
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1831
if(ret == -1){
1832
perror_plus("sigaddset");
1833
exitcode = EX_OSERR;
1834
goto end;
1835
}
1836
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1837
if(ret == -1){
1838
perror_plus("sigaddset");
1839
exitcode = EX_OSERR;
1840
goto end;
1841
}
1842
/* Need to check if the handler is SIG_IGN before handling:
1843
| [[info:libc:Initial Signal Actions]] |
1844
| [[info:libc:Basic Signal Handling]] |
1845
*/
1846
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1847
if(ret == -1){
1848
perror_plus("sigaction");
1849
return EX_OSERR;
1850
}
1851
if(old_sigterm_action.sa_handler != SIG_IGN){
1852
ret = sigaction(SIGINT, &sigterm_action, NULL);
1853
if(ret == -1){
1854
perror_plus("sigaction");
1855
exitcode = EX_OSERR;
1856
goto end;
1857
}
1858
}
1859
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1860
if(ret == -1){
1861
perror_plus("sigaction");
1862
return EX_OSERR;
1863
}
1864
if(old_sigterm_action.sa_handler != SIG_IGN){
1865
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1866
if(ret == -1){
1867
perror_plus("sigaction");
1868
exitcode = EX_OSERR;
1869
goto end;
1870
}
1871
}
1872
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1873
if(ret == -1){
1874
perror_plus("sigaction");
1875
return EX_OSERR;
1876
}
1877
if(old_sigterm_action.sa_handler != SIG_IGN){
1878
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1879
if(ret == -1){
1880
perror_plus("sigaction");
1881
exitcode = EX_OSERR;
1882
goto end;
1883
}
1884
}
1885
1886
/* If the interface is down, bring it up */
1887
if(strcmp(interface, "none") != 0){
931
1888
if_index = (AvahiIfIndex) if_nametoindex(interface);
932
1889
if(if_index == 0){
933
fprintf(stderr, "No such interface: \"%s\"\n", interface);
934
exit(EXIT_FAILURE);
935
}
936
937
if(connect_to != NULL){
938
/* Connect directly, do not use Zeroconf */
939
/* (Mainly meant for debugging) */
940
char *address = strrchr(connect_to, ':');
941
if(address == NULL){
942
fprintf(stderr, "No colon in address\n");
943
exitcode = EXIT_FAILURE;
944
goto end;
945
}
946
errno = 0;
947
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
948
if(errno){
949
perror("Bad port number");
950
exitcode = EXIT_FAILURE;
951
goto end;
952
}
953
*address = '\0';
954
address = connect_to;
955
ret = start_mandos_communication(address, port, if_index, &mc);
956
if(ret < 0){
957
exitcode = EXIT_FAILURE;
958
} else {
959
exitcode = EXIT_SUCCESS;
960
}
961
goto end;
962
}
963
964
/* If the interface is down, bring it up */
965
{
966
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
967
if(sd < 0) {
968
perror("socket");
969
exitcode = EXIT_FAILURE;
970
goto end;
971
}
972
strcpy(network.ifr_name, interface); /* Spurious warning */
973
ret = ioctl(sd, SIOCGIFFLAGS, &network);
974
if(ret == -1){
975
perror("ioctl SIOCGIFFLAGS");
976
exitcode = EXIT_FAILURE;
977
goto end;
978
}
979
if((network.ifr_flags & IFF_UP) == 0){
980
network.ifr_flags |= IFF_UP;
1890
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1891
exitcode = EX_UNAVAILABLE;
1892
goto end;
1893
}
1894
1895
if(quit_now){
1896
goto end;
1897
}
1898
1899
/* Re-raise priviliges */
1900
errno = 0;
1901
ret = seteuid(0);
1902
if(ret == -1){
1903
perror_plus("seteuid");
1904
}
1905
1906
#ifdef __linux__
1907
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1908
messages about the network interface to mess up the prompt */
1909
ret = klogctl(8, NULL, 5);
1910
bool restore_loglevel = true;
1911
if(ret == -1){
1912
restore_loglevel = false;
1913
perror_plus("klogctl");
1914
}
1915
#endif /* __linux__ */
1916
1917
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1918
if(sd < 0){
1919
perror_plus("socket");
1920
exitcode = EX_OSERR;
1921
#ifdef __linux__
1922
if(restore_loglevel){
1923
ret = klogctl(7, NULL, 0);
1924
if(ret == -1){
1925
perror_plus("klogctl");
1926
}
1927
}
1928
#endif /* __linux__ */
1929
/* Lower privileges */
1930
errno = 0;
1931
ret = seteuid(uid);
1932
if(ret == -1){
1933
perror_plus("seteuid");
1934
}
1935
goto end;
1936
}
1937
strcpy(network.ifr_name, interface);
1938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1939
if(ret == -1){
1940
perror_plus("ioctl SIOCGIFFLAGS");
1941
#ifdef __linux__
1942
if(restore_loglevel){
1943
ret = klogctl(7, NULL, 0);
1944
if(ret == -1){
1945
perror_plus("klogctl");
1946
}
1947
}
1948
#endif /* __linux__ */
1949
exitcode = EX_OSERR;
1950
/* Lower privileges */
1951
errno = 0;
1952
ret = seteuid(uid);
1953
if(ret == -1){
1954
perror_plus("seteuid");
1955
}
1956
goto end;
1957
}
1958
if((network.ifr_flags & IFF_UP) == 0){
1959
network.ifr_flags |= IFF_UP;
1960
take_down_interface = true;
1961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1962
if(ret == -1){
1963
take_down_interface = false;
1964
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1965
exitcode = EX_OSERR;
1966
#ifdef __linux__
1967
if(restore_loglevel){
1968
ret = klogctl(7, NULL, 0);
1969
if(ret == -1){
1970
perror_plus("klogctl");
1971
}
1972
}
1973
#endif /* __linux__ */
1974
/* Lower privileges */
1975
errno = 0;
1976
ret = seteuid(uid);
1977
if(ret == -1){
1978
perror_plus("seteuid");
1979
}
1980
goto end;
1981
}
1982
}
1983
/* Sleep checking until interface is running.
1984
Check every 0.25s, up to total time of delay */
1985
for(int i=0; i < delay * 4; i++){
1986
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1987
if(ret == -1){
1988
perror_plus("ioctl SIOCGIFFLAGS");
1989
} else if(network.ifr_flags & IFF_RUNNING){
1990
break;
1991
}
1992
struct timespec sleeptime = { .tv_nsec = 250000000 };
1993
ret = nanosleep(&sleeptime, NULL);
1994
if(ret == -1 and errno != EINTR){
1995
perror_plus("nanosleep");
1996
}
1997
}
1998
if(not take_down_interface){
1999
/* We won't need the socket anymore */
2000
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2001
if(ret == -1){
2002
perror_plus("close");
2003
}
2004
}
2005
#ifdef __linux__
2006
if(restore_loglevel){
2007
/* Restores kernel loglevel to default */
2008
ret = klogctl(7, NULL, 0);
2009
if(ret == -1){
2010
perror_plus("klogctl");
2011
}
2012
}
2013
#endif /* __linux__ */
2014
/* Lower privileges */
2015
errno = 0;
2016
/* Lower privileges */
2017
ret = seteuid(uid);
2018
if(ret == -1){
2019
perror_plus("seteuid");
2020
}
2021
}
2022
2023
if(quit_now){
2024
goto end;
2025
}
2026
2027
ret = init_gnutls_global(pubkey, seckey);
2028
if(ret == -1){
2029
fprintf_plus(stderr, "init_gnutls_global failed\n");
2030
exitcode = EX_UNAVAILABLE;
2031
goto end;
2032
} else {
2033
gnutls_initialized = true;
2034
}
2035
2036
if(quit_now){
2037
goto end;
2038
}
2039
2040
if(mkdtemp(tempdir) == NULL){
2041
perror_plus("mkdtemp");
2042
goto end;
2043
}
2044
tempdir_created = true;
2045
2046
if(quit_now){
2047
goto end;
2048
}
2049
2050
if(not init_gpgme(pubkey, seckey, tempdir)){
2051
fprintf_plus(stderr, "init_gpgme failed\n");
2052
exitcode = EX_UNAVAILABLE;
2053
goto end;
2054
} else {
2055
gpgme_initialized = true;
2056
}
2057
2058
if(quit_now){
2059
goto end;
2060
}
2061
2062
if(connect_to != NULL){
2063
/* Connect directly, do not use Zeroconf */
2064
/* (Mainly meant for debugging) */
2065
char *address = strrchr(connect_to, ':');
2066
if(address == NULL){
2067
fprintf_plus(stderr, "No colon in address\n");
2068
exitcode = EX_USAGE;
2069
goto end;
2070
}
2071
2072
if(quit_now){
2073
goto end;
2074
}
2075
2076
uint16_t port;
2077
errno = 0;
2078
tmpmax = strtoimax(address+1, &tmp, 10);
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2080
or tmpmax != (uint16_t)tmpmax){
2081
fprintf_plus(stderr, "Bad port number\n");
2082
exitcode = EX_USAGE;
2083
goto end;
2084
}
2085
2086
if(quit_now){
2087
goto end;
2088
}
2089
2090
port = (uint16_t)tmpmax;
2091
*address = '\0';
2092
/* Colon in address indicates IPv6 */
2093
int af;
2094
if(strchr(connect_to, ':') != NULL){
2095
af = AF_INET6;
2096
/* Accept [] around IPv6 address - see RFC 5952 */
2097
if(connect_to[0] == '[' and address[-1] == ']')
2098
{
2099
connect_to++;
2100
address[-1] = '\0';
2101
}
2102
} else {
2103
af = AF_INET;
2104
}
2105
address = connect_to;
2106
2107
if(quit_now){
2108
goto end;
2109
}
2110
2111
while(not quit_now){
2112
ret = start_mandos_communication(address, port, if_index, af);
2113
if(quit_now or ret == 0){
2114
break;
2115
}
2116
if(debug){
2117
fprintf_plus(stderr, "Retrying in %d seconds\n",
2118
(int)retry_interval);
2119
}
2120
sleep((int)retry_interval);
2121
}
2122
2123
if (not quit_now){
2124
exitcode = EXIT_SUCCESS;
2125
}
2126
2127
goto end;
2128
}
2129
2130
if(quit_now){
2131
goto end;
2132
}
2133
2134
{
2135
AvahiServerConfig config;
2136
/* Do not publish any local Zeroconf records */
2137
avahi_server_config_init(&config);
2138
config.publish_hinfo = 0;
2139
config.publish_addresses = 0;
2140
config.publish_workstation = 0;
2141
config.publish_domain = 0;
2142
2143
/* Allocate a new server */
2144
mc.server = avahi_server_new(avahi_simple_poll_get
2145
(mc.simple_poll), &config, NULL,
2146
NULL, &error);
2147
2148
/* Free the Avahi configuration data */
2149
avahi_server_config_free(&config);
2150
}
2151
2152
/* Check if creating the Avahi server object succeeded */
2153
if(mc.server == NULL){
2154
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2155
avahi_strerror(error));
2156
exitcode = EX_UNAVAILABLE;
2157
goto end;
2158
}
2159
2160
if(quit_now){
2161
goto end;
2162
}
2163
2164
/* Create the Avahi service browser */
2165
sb = avahi_s_service_browser_new(mc.server, if_index,
2166
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2167
NULL, 0, browse_callback, NULL);
2168
if(sb == NULL){
2169
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2170
avahi_strerror(avahi_server_errno(mc.server)));
2171
exitcode = EX_UNAVAILABLE;
2172
goto end;
2173
}
2174
2175
if(quit_now){
2176
goto end;
2177
}
2178
2179
/* Run the main loop */
2180
2181
if(debug){
2182
fprintf_plus(stderr, "Starting Avahi loop search\n");
2183
}
2184
2185
ret = avahi_loop_with_timeout(mc.simple_poll,
2186
(int)(retry_interval * 1000));
2187
if(debug){
2188
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2189
(ret == 0) ? "successfully" : "with error");
2190
}
2191
2192
end:
2193
2194
if(debug){
2195
fprintf_plus(stderr, "%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
/* Run network hooks */
2230
run_network_hooks("stop", interface, delay);
2231
2232
/* Re-raise priviliges */
2233
{
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
2240
/* Take down the network interface */
2241
if(take_down_interface and geteuid() == 0){
2242
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2243
if(ret == -1){
2244
perror_plus("ioctl SIOCGIFFLAGS");
2245
} else if(network.ifr_flags & IFF_UP){
2246
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
981
2247
ret = ioctl(sd, SIOCSIFFLAGS, &network);
982
2248
if(ret == -1){
983
perror("ioctl SIOCSIFFLAGS");
984
exitcode = EXIT_FAILURE;
985
goto end;
986
}
987
}
988
close(sd);
989
}
990
991
if (not debug){
992
avahi_set_log_function(empty_log);
993
}
994
995
/* Initialize the pseudo-RNG for Avahi */
996
srand((unsigned int) time(NULL));
997
998
/* Allocate main Avahi loop object */
999
mc.simple_poll = avahi_simple_poll_new();
1000
if (mc.simple_poll == NULL) {
1001
fprintf(stderr, "Avahi: Failed to create simple poll"
1002
" object.\n");
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
{
1008
AvahiServerConfig config;
1009
/* Do not publish any local Zeroconf records */
1010
avahi_server_config_init(&config);
1011
config.publish_hinfo = 0;
1012
config.publish_addresses = 0;
1013
config.publish_workstation = 0;
1014
config.publish_domain = 0;
1015
1016
/* Allocate a new server */
1017
mc.server = avahi_server_new(avahi_simple_poll_get
1018
(mc.simple_poll), &config, NULL,
1019
NULL, &error);
1020
1021
/* Free the Avahi configuration data */
1022
avahi_server_config_free(&config);
1023
}
1024
1025
/* Check if creating the Avahi server object succeeded */
1026
if (mc.server == NULL) {
1027
fprintf(stderr, "Failed to create Avahi server: %s\n",
1028
avahi_strerror(error));
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
/* Create the Avahi service browser */
1034
sb = avahi_s_service_browser_new(mc.server, if_index,
1035
AVAHI_PROTO_INET6,
1036
"_mandos._tcp", NULL, 0,
1037
browse_callback, &mc);
1038
if (sb == NULL) {
1039
fprintf(stderr, "Failed to create service browser: %s\n",
1040
avahi_strerror(avahi_server_errno(mc.server)));
1041
exitcode = EXIT_FAILURE;
1042
goto end;
1043
}
1044
1045
/* Run the main loop */
1046
1047
if (debug){
1048
fprintf(stderr, "Starting Avahi loop search\n");
1049
}
1050
1051
avahi_simple_poll_loop(mc.simple_poll);
1052
1053
end:
1054
1055
if (debug){
1056
fprintf(stderr, "%s exiting\n", argv[0]);
1057
}
1058
1059
/* Cleanup things */
1060
if (sb != NULL)
1061
avahi_s_service_browser_free(sb);
1062
1063
if (mc.server != NULL)
1064
avahi_server_free(mc.server);
1065
1066
if (mc.simple_poll != NULL)
1067
avahi_simple_poll_free(mc.simple_poll);
1068
free(pubkeyfile);
1069
free(seckeyfile);
1070
1071
if (gnutls_initalized){
1072
gnutls_certificate_free_credentials (mc.cred);
1073
gnutls_global_deinit ();
1074
}
1075
1076
return exitcode;
2249
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2250
}
2251
}
2252
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2253
if(ret == -1){
2254
perror_plus("close");
2255
}
2256
}
2257
}
2258
/* Lower privileges permanently */
2259
errno = 0;
2260
ret = setuid(uid);
2261
if(ret == -1){
2262
perror_plus("setuid");
2263
}
2264
2265
/* Removes the GPGME temp directory and all files inside */
2266
if(tempdir_created){
2267
struct dirent **direntries = NULL;
2268
struct dirent *direntry = NULL;
2269
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
alphasort);
2271
if (numentries > 0){
2272
for(int i = 0; i < numentries; i++){
2273
direntry = direntries[i];
2274
char *fullname = NULL;
2275
ret = asprintf(&fullname, "%s/%s", tempdir,
2276
direntry->d_name);
2277
if(ret < 0){
2278
perror_plus("asprintf");
2279
continue;
2280
}
2281
ret = remove(fullname);
2282
if(ret == -1){
2283
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2284
strerror(errno));
2285
}
2286
free(fullname);
2287
}
2288
}
2289
2290
/* need to clean even if 0 because man page doesn't specify */
2291
free(direntries);
2292
if (numentries == -1){
2293
perror_plus("scandir");
2294
}
2295
ret = rmdir(tempdir);
2296
if(ret == -1 and errno != ENOENT){
2297
perror_plus("rmdir");
2298
}
2299
}
2300
2301
if(quit_now){
2302
sigemptyset(&old_sigterm_action.sa_mask);
2303
old_sigterm_action.sa_handler = SIG_DFL;
2304
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2305
&old_sigterm_action,
2306
NULL));
2307
if(ret == -1){
2308
perror_plus("sigaction");
2309
}
2310
do {
2311
ret = raise(signal_received);
2312
} while(ret != 0 and errno == EINTR);
2313
if(ret != 0){
2314
perror_plus("raise");
2315
abort();
2316
}
2317
TEMP_FAILURE_RETRY(pause());
2318
}
2319
2320
return exitcode;
1077
2321
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0