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- Committer: Teddy Hogeborn
- Date: 2008-12-10 01:26:02 UTC
- mfrom: (237.1.2 mandos)
- Revision ID: teddy@fukt.bsnet.se-20081210012602-vhz3h75xkj24t340
First version of a somewhat complete D-Bus server interface. Also
change user/group name to "_mandos".
* debian/mandos.postinst: Rename old "mandos" user and group to
"_mandos"; create "_mandos" user and group
if none exist.
* debian/mandos-client.postinst: - '' -
* initramfs-tools-hook: Try "_mandos" before "mandos" as user and
group name.
* mandos (_datetime_to_dbus_struct): New; was previously local.
(Client.started): Renamed to "last_started". All users changed.
(Client.started): New; boolean.
(Client.dbus_object_path): New.
(Client.check_command): Renamed to "checker_command". All users
changed.
(Client.__init__): Set and use "self.dbus_object_path". Set
"self.started".
(Client.start): Update "self.started". Emit "self.PropertyChanged"
signals for both "started" and "last_started".
(Client.stop): Update "self.started". Emit "self.PropertyChanged"
signal for "started".
(Client.checker_callback): Take additional "command" argument. All
callers changed. Emit
"self.PropertyChanged" signal.
(Client.bump_timeout): Emit "self.PropertyChanged" signal for
"last_checked_ok".
(Client.start_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.stop_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.still_valid): Bug fix: use "getattr(self, started, False)"
instead of "self.started" in case this client
object is so new that the "started" attribute
has not been created yet.
(Client.IntervalChanged, Client.CheckerIsRunning, Client.GetChecker,
Client.GetCreated, Client.GetFingerprint, Client.GetHost,
Client.GetInterval, Client.GetName, Client.GetStarted,
Client.GetTimeout, Client.StateChanged, Client.TimeoutChanged):
Removed; all callers changed.
(Client.CheckerCompleted): Add "condition" and "command" arguments.
All callers changed.
(Client.GetAllProperties, Client.PropertyChanged): New.
(Client.StillValid): Renamed to "IsStillValid".
(Client.StartChecker): Changed to its own function to avoid the
return value from "Client.start_checker()".
(Client.Stop): Changed to its own function to avoid the return value
from "Client.stop()".
(main): Try "_mandos" before "mandos" as user and group name.
Removed inner function "remove_from_clients". New inner
class "MandosServer".
change user/group name to "_mandos".
* debian/mandos.postinst: Rename old "mandos" user and group to
"_mandos"; create "_mandos" user and group
if none exist.
* debian/mandos-client.postinst: - '' -
* initramfs-tools-hook: Try "_mandos" before "mandos" as user and
group name.
* mandos (_datetime_to_dbus_struct): New; was previously local.
(Client.started): Renamed to "last_started". All users changed.
(Client.started): New; boolean.
(Client.dbus_object_path): New.
(Client.check_command): Renamed to "checker_command". All users
changed.
(Client.__init__): Set and use "self.dbus_object_path". Set
"self.started".
(Client.start): Update "self.started". Emit "self.PropertyChanged"
signals for both "started" and "last_started".
(Client.stop): Update "self.started". Emit "self.PropertyChanged"
signal for "started".
(Client.checker_callback): Take additional "command" argument. All
callers changed. Emit
"self.PropertyChanged" signal.
(Client.bump_timeout): Emit "self.PropertyChanged" signal for
"last_checked_ok".
(Client.start_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.stop_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.still_valid): Bug fix: use "getattr(self, started, False)"
instead of "self.started" in case this client
object is so new that the "started" attribute
has not been created yet.
(Client.IntervalChanged, Client.CheckerIsRunning, Client.GetChecker,
Client.GetCreated, Client.GetFingerprint, Client.GetHost,
Client.GetInterval, Client.GetName, Client.GetStarted,
Client.GetTimeout, Client.StateChanged, Client.TimeoutChanged):
Removed; all callers changed.
(Client.CheckerCompleted): Add "condition" and "command" arguments.
All callers changed.
(Client.GetAllProperties, Client.PropertyChanged): New.
(Client.StillValid): Renamed to "IsStillValid".
(Client.StartChecker): Changed to its own function to avoid the
return value from "Client.start_checker()".
(Client.Stop): Changed to its own function to avoid the return value
from "Client.stop()".
(main): Try "_mandos" before "mandos" as user and group name.
Removed inner function "remove_from_clients". New inner
class "MandosServer".
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008 Teddy Hogeborn
13
* Copyright © 2008 Björn Påhlsson
14
14
*
15
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* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
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* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror() */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#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 */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/ioctl.h> /* ioctl */
52
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
49
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
52
#include <sys/stat.h> /* open() */
57
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
54
struct in6_addr, inet_pton(),
55
connect() */
59
56
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
64
59
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
60
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
68
62
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
63
SIOCSIFFLAGS, if_indextoname(),
70
64
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
65
#include <netinet/in.h>
74
66
#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 */
67
getuid(), getgid(), setuid(),
68
setgid() */
69
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
79
71
#include <argp.h> /* struct argp_option, error_t, struct
80
72
argp_state, struct argp,
81
73
argp_parse(), ARGP_KEY_ARG,
82
74
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__ */
95
75
96
76
/* Avahi */
97
77
/* All Avahi types, constants and functions
110
90
gnutls_*
111
91
init_gnutls_session(),
112
92
GNUTLS_* */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
94
GNUTLS_OPENPGP_FMT_BASE64 */
116
95
117
96
/* GPGME */
118
97
#include <gpgme.h> /* All GPGME types, constants and
126
105
#define PATHDIR "/conf/conf.d/mandos"
127
106
#define SECKEY "seckey.txt"
128
107
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
108
131
109
bool debug = false;
132
110
static const char mandos_protocol_version[] = "1";
133
111
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;
112
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
113
150
114
/* Used for passing in values through the Avahi callback functions */
151
115
typedef struct {
156
120
gnutls_dh_params_t dh_params;
157
121
const char *priority;
158
122
gpgme_ctx_t ctx;
159
server *current_server;
160
123
} mandos_context;
161
124
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
187
125
/*
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
189
* bytes. "buffer_capacity" is how much is currently allocated,
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
190
128
* "buffer_length" is how much is already used.
191
129
*/
192
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
131
size_t buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
195
133
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
134
if (buffer == NULL){
197
135
return 0;
198
136
}
199
137
buffer_capacity += BUFFER_SIZE;
201
139
return buffer_capacity;
202
140
}
203
141
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
241
142
/*
242
143
* Initialize GPGME.
243
144
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
146
const char *pubkey, const char *tempdir){
147
int ret;
246
148
gpgme_error_t rc;
247
149
gpgme_engine_info_t engine_info;
248
150
249
151
250
152
/*
251
* Helper function to insert pub and seckey to the engine keyring.
153
* Helper function to insert pub and seckey to the enigne keyring.
252
154
*/
253
155
bool import_key(const char *filename){
254
int ret;
255
156
int fd;
256
157
gpgme_data_t pgp_data;
257
158
258
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
259
160
if(fd == -1){
260
perror_plus("open");
161
perror("open");
261
162
return false;
262
163
}
263
164
264
165
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));
166
if (rc != GPG_ERR_NO_ERROR){
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
gpgme_strsource(rc), gpgme_strerror(rc));
169
return false;
170
}
171
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
176
return false;
177
}
178
179
ret = TEMP_FAILURE_RETRY(close(fd));
279
180
if(ret == -1){
280
perror_plus("close");
181
perror("close");
281
182
}
282
183
gpgme_data_release(pgp_data);
283
184
return true;
284
185
}
285
186
286
if(debug){
287
fprintf_plus(stderr, "Initializing GPGME\n");
187
if (debug){
188
fprintf(stderr, "Initialize gpgme\n");
288
189
}
289
190
290
191
/* Init GPGME */
291
192
gpgme_check_version(NULL);
292
193
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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));
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
296
197
return false;
297
198
}
298
199
299
/* Set GPGME home directory for the OpenPGP engine only */
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));
200
/* Set GPGME home directory for the OpenPGP engine only */
201
rc = gpgme_get_engine_info (&engine_info);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
304
205
return false;
305
206
}
306
207
while(engine_info != NULL){
312
213
engine_info = engine_info->next;
313
214
}
314
215
if(engine_info == NULL){
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
216
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
317
217
return false;
318
218
}
319
219
320
220
/* 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;
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
226
}
227
228
if (not import_key(pubkey) or not import_key(seckey)){
229
return false;
230
}
231
232
return true;
334
233
}
335
234
336
235
/*
337
236
* Decrypt OpenPGP data.
338
237
* Returns -1 on error
339
238
*/
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
341
size_t crypto_size,
342
char **plaintext){
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
343
243
gpgme_data_t dh_crypto, dh_plain;
344
244
gpgme_error_t rc;
345
245
ssize_t ret;
346
246
size_t plaintext_capacity = 0;
347
247
ssize_t plaintext_length = 0;
348
248
349
if(debug){
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
249
if (debug){
250
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
251
}
352
252
353
253
/* Create new GPGME data buffer from memory cryptotext */
354
254
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
255
0);
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));
256
if (rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
359
259
return -1;
360
260
}
361
261
362
262
/* Create new empty GPGME data buffer for the plaintext */
363
263
rc = gpgme_data_new(&dh_plain);
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));
264
if (rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
368
267
gpgme_data_release(dh_crypto);
369
268
return -1;
370
269
}
371
270
372
271
/* Decrypt data from the cryptotext data buffer to the plaintext
373
272
data buffer */
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));
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
274
if (rc != GPG_ERR_NO_ERROR){
275
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
276
gpgme_strsource(rc), gpgme_strerror(rc));
378
277
plaintext_length = -1;
379
if(debug){
278
if (debug){
380
279
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");
280
result = gpgme_op_decrypt_result(mc->ctx);
281
if (result == NULL){
282
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
283
} 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);
284
fprintf(stderr, "Unsupported algorithm: %s\n",
285
result->unsupported_algorithm);
286
fprintf(stderr, "Wrong key usage: %u\n",
287
result->wrong_key_usage);
389
288
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
289
fprintf(stderr, "File name: %s\n", result->file_name);
391
290
}
392
291
gpgme_recipient_t recipient;
393
292
recipient = result->recipients;
394
while(recipient != NULL){
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");
402
recipient = recipient->next;
293
if(recipient){
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
300
? "No" : "Yes");
301
recipient = recipient->next;
302
}
403
303
}
404
304
}
405
305
}
407
307
}
408
308
409
309
if(debug){
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
310
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
311
}
412
312
413
313
/* Seek back to the beginning of the GPGME plaintext data buffer */
414
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
415
perror_plus("gpgme_data_seek");
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
315
perror("gpgme_data_seek");
416
316
plaintext_length = -1;
417
317
goto decrypt_end;
418
318
}
419
319
420
320
*plaintext = NULL;
421
321
while(true){
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;
322
plaintext_capacity = adjustbuffer(plaintext,
323
(size_t)plaintext_length,
324
plaintext_capacity);
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
327
plaintext_length = -1;
328
goto decrypt_end;
429
329
}
430
330
431
331
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
432
332
BUFFER_SIZE);
433
333
/* Print the data, if any */
434
if(ret == 0){
334
if (ret == 0){
435
335
/* EOF */
436
336
break;
437
337
}
438
338
if(ret < 0){
439
perror_plus("gpgme_data_read");
339
perror("gpgme_data_read");
440
340
plaintext_length = -1;
441
341
goto decrypt_end;
442
342
}
444
344
}
445
345
446
346
if(debug){
447
fprintf_plus(stderr, "Decrypted password is: ");
347
fprintf(stderr, "Decrypted password is: ");
448
348
for(ssize_t i = 0; i < plaintext_length; i++){
449
349
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
450
350
}
461
361
return plaintext_length;
462
362
}
463
363
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)
364
static const char * safer_gnutls_strerror (int value) {
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
366
if (ret == NULL)
468
367
ret = "(unknown)";
469
368
return ret;
470
369
}
472
371
/* GnuTLS log function callback */
473
372
static void debuggnutls(__attribute__((unused)) int level,
474
373
const char* string){
475
fprintf_plus(stderr, "GnuTLS: %s", string);
374
fprintf(stderr, "GnuTLS: %s", string);
476
375
}
477
376
478
static int init_gnutls_global(const char *pubkeyfilename,
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
479
379
const char *seckeyfilename){
480
380
int ret;
481
381
482
382
if(debug){
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
383
fprintf(stderr, "Initializing GnuTLS\n");
484
384
}
485
385
486
386
ret = gnutls_global_init();
487
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
490
390
return -1;
491
391
}
492
392
493
if(debug){
393
if (debug){
494
394
/* "Use a log level over 10 to enable all debugging options."
495
395
* - GnuTLS manual
496
396
*/
499
399
}
500
400
501
401
/* OpenPGP credentials */
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();
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
507
408
return -1;
508
409
}
509
410
510
411
if(debug){
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
412
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
413
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
414
seckeyfilename);
515
415
}
516
416
517
417
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
418
(mc->cred, pubkeyfilename, seckeyfilename,
519
419
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));
420
if (ret != GNUTLS_E_SUCCESS) {
421
fprintf(stderr,
422
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
424
fprintf(stderr, "The GnuTLS error is: %s\n",
425
safer_gnutls_strerror(ret));
526
426
goto globalfail;
527
427
}
528
428
529
429
/* GnuTLS server initialization */
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));
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
535
434
goto globalfail;
536
435
}
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));
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
541
440
goto globalfail;
542
441
}
543
442
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
444
546
445
return 0;
547
446
548
447
globalfail:
549
448
550
gnutls_certificate_free_credentials(mc.cred);
449
gnutls_certificate_free_credentials(mc->cred);
551
450
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
451
gnutls_dh_params_deinit(mc->dh_params);
553
452
return -1;
554
453
}
555
454
556
static int init_gnutls_session(gnutls_session_t *session){
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
557
457
int ret;
558
458
/* GnuTLS session creation */
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));
459
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
462
safer_gnutls_strerror(ret));
569
463
}
570
464
571
465
{
572
466
const char *err;
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);
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
469
fprintf(stderr, "Syntax error at: %s\n", err);
470
fprintf(stderr, "GnuTLS error: %s\n",
471
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
585
473
return -1;
586
474
}
587
475
}
588
476
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);
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
478
mc->cred);
479
if (ret != GNUTLS_E_SUCCESS) {
480
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
481
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
601
483
return -1;
602
484
}
603
485
604
486
/* ignore client certificate if any. */
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
487
gnutls_certificate_server_set_request (*session,
488
GNUTLS_CERT_IGNORE);
606
489
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
608
491
609
492
return 0;
610
493
}
616
499
/* Called when a Mandos server is found */
617
500
static int start_mandos_communication(const char *ip, uint16_t port,
618
501
AvahiIfIndex if_index,
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;
502
mandos_context *mc){
503
int ret, tcp_sd;
504
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
626
505
char *buffer = NULL;
627
char *decrypted_buffer = NULL;
506
char *decrypted_buffer;
628
507
size_t buffer_length = 0;
629
508
size_t buffer_capacity = 0;
509
ssize_t decrypted_buffer_size;
630
510
size_t written;
631
int retval = -1;
511
int retval = 0;
512
char interface[IF_NAMESIZE];
632
513
gnutls_session_t session;
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;
514
515
ret = init_gnutls_session (mc, &session);
516
if (ret != 0){
517
return -1;
518
}
519
520
if(debug){
521
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
522
"\n", ip, port);
523
}
524
525
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
526
if(tcp_sd < 0) {
527
perror("socket");
528
return -1;
529
}
530
531
if(debug){
532
if(if_indextoname((unsigned int)if_index, interface) == NULL){
533
perror("if_indextoname");
534
return -1;
535
}
536
fprintf(stderr, "Binding to interface %s\n", interface);
676
537
}
677
538
678
539
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;
540
to.in6.sin6_family = AF_INET6;
541
/* It would be nice to have a way to detect if we were passed an
542
IPv4 address here. Now we assume an IPv6 address. */
543
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
544
if (ret < 0 ){
545
perror("inet_pton");
546
return -1;
691
547
}
692
548
if(ret == 0){
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
}
549
fprintf(stderr, "Bad address: %s\n", ip);
550
return -1;
551
}
552
to.in6.sin6_port = htons(port); /* Spurious warning */
720
553
721
if(quit_now){
722
errno = EINTR;
723
goto mandos_end;
724
}
554
to.in6.sin6_scope_id = (uint32_t)if_index;
725
555
726
556
if(debug){
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");
557
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
558
port);
559
char addrstr[INET6_ADDRSTRLEN] = "";
560
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
561
sizeof(addrstr)) == NULL){
562
perror("inet_ntop");
751
563
} else {
752
564
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
565
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
566
}
755
567
}
756
568
}
757
569
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;
570
ret = connect(tcp_sd, &to.in, sizeof(to));
571
if (ret < 0){
572
perror("connect");
573
return -1;
780
574
}
781
575
782
576
const char *out = mandos_protocol_version;
783
577
written = 0;
784
while(true){
578
while (true){
785
579
size_t out_size = strlen(out);
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;
580
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
581
out_size - written));
582
if (ret == -1){
583
perror("write");
584
retval = -1;
792
585
goto mandos_end;
793
586
}
794
587
written += (size_t)ret;
795
588
if(written < out_size){
796
589
continue;
797
590
} else {
798
if(out == mandos_protocol_version){
591
if (out == mandos_protocol_version){
799
592
written = 0;
800
593
out = "\r\n";
801
594
} else {
802
595
break;
803
596
}
804
597
}
805
806
if(quit_now){
807
errno = EINTR;
808
goto mandos_end;
809
}
810
598
}
811
599
812
600
if(debug){
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
}
601
fprintf(stderr, "Establishing TLS session with %s\n", ip);
602
}
603
604
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
605
606
do{
607
ret = gnutls_handshake (session);
835
608
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
836
609
837
if(ret != GNUTLS_E_SUCCESS){
610
if (ret != GNUTLS_E_SUCCESS){
838
611
if(debug){
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
840
gnutls_perror(ret);
612
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
613
gnutls_perror (ret);
841
614
}
842
errno = EPROTO;
615
retval = -1;
843
616
goto mandos_end;
844
617
}
845
618
846
619
/* Read OpenPGP packet that contains the wanted password */
847
620
848
621
if(debug){
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
622
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
623
ip);
851
624
}
852
625
853
626
while(true){
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){
627
buffer_capacity = adjustbuffer(&buffer, buffer_length,
628
buffer_capacity);
629
if (buffer_capacity == 0){
630
perror("adjustbuffer");
631
retval = -1;
632
goto mandos_end;
633
}
634
635
ret = gnutls_record_recv(session, buffer+buffer_length,
636
BUFFER_SIZE);
637
if (ret == 0){
877
638
break;
878
639
}
879
if(sret < 0){
880
switch(sret){
640
if (ret < 0){
641
switch(ret){
881
642
case GNUTLS_E_INTERRUPTED:
882
643
case GNUTLS_E_AGAIN:
883
644
break;
884
645
case GNUTLS_E_REHANDSHAKE:
885
do {
886
ret = gnutls_handshake(session);
887
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
646
do{
647
ret = gnutls_handshake (session);
892
648
} 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;
649
if (ret < 0){
650
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
651
gnutls_perror (ret);
652
retval = -1;
898
653
goto mandos_end;
899
654
}
900
655
break;
901
656
default:
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;
657
fprintf(stderr, "Unknown error while reading data from"
658
" encrypted session with Mandos server\n");
659
retval = -1;
660
gnutls_bye (session, GNUTLS_SHUT_RDWR);
906
661
goto mandos_end;
907
662
}
908
663
} else {
909
buffer_length += (size_t) sret;
664
buffer_length += (size_t) ret;
910
665
}
911
666
}
912
667
913
668
if(debug){
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,
669
fprintf(stderr, "Closing TLS session\n");
670
}
671
672
gnutls_bye (session, GNUTLS_SHUT_RDWR);
673
674
if (buffer_length > 0){
675
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
676
buffer_length,
933
677
&decrypted_buffer);
934
if(decrypted_buffer_size >= 0){
935
678
if (decrypted_buffer_size >= 0){
936
679
written = 0;
937
680
while(written < (size_t) decrypted_buffer_size){
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);
681
ret = (int)fwrite (decrypted_buffer + written, 1,
682
(size_t)decrypted_buffer_size - written,
683
stdout);
946
684
if(ret == 0 and ferror(stdout)){
947
int e = errno;
948
685
if(debug){
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
686
fprintf(stderr, "Error writing encrypted data: %s\n",
687
strerror(errno));
951
688
}
952
errno = e;
953
goto mandos_end;
689
retval = -1;
690
break;
954
691
}
955
692
written += (size_t)ret;
956
693
}
957
retval = 0;
694
free(decrypted_buffer);
695
} else {
696
retval = -1;
958
697
}
698
} else {
699
retval = -1;
959
700
}
960
701
961
702
/* Shutdown procedure */
962
703
963
704
mandos_end:
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
}
705
free(buffer);
706
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
707
if(ret == -1){
708
perror("close");
983
709
}
710
gnutls_deinit (session);
984
711
return retval;
985
712
}
986
713
987
714
static void resolve_callback(AvahiSServiceResolver *r,
988
715
AvahiIfIndex interface,
989
AvahiProtocol proto,
716
AVAHI_GCC_UNUSED AvahiProtocol protocol,
990
717
AvahiResolverEvent event,
991
718
const char *name,
992
719
const char *type,
997
724
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
725
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
726
flags,
1000
AVAHI_GCC_UNUSED void* userdata){
727
void* userdata) {
728
mandos_context *mc = userdata;
1001
729
assert(r);
1002
730
1003
731
/* Called whenever a service has been resolved successfully or
1004
732
timed out */
1005
733
1006
if(quit_now){
1007
return;
1008
}
1009
1010
switch(event){
734
switch (event) {
1011
735
default:
1012
736
case AVAHI_RESOLVER_FAILURE:
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)));
737
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
738
" of type '%s' in domain '%s': %s\n", name, type, domain,
739
avahi_strerror(avahi_server_errno(mc->server)));
1017
740
break;
1018
741
1019
742
case AVAHI_RESOLVER_FOUND:
1021
744
char ip[AVAHI_ADDRESS_STR_MAX];
1022
745
avahi_address_snprint(ip, sizeof(ip), address);
1023
746
if(debug){
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);
747
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
748
PRIu16 ") on port %d\n", name, host_name, ip,
749
interface, port);
1027
750
}
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
}
751
int ret = start_mandos_communication(ip, port, interface, mc);
752
if (ret == 0){
753
avahi_simple_poll_quit(mc->simple_poll);
1038
754
}
1039
755
}
1040
756
}
1041
757
avahi_s_service_resolver_free(r);
1042
758
}
1043
759
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){
760
static void browse_callback( AvahiSServiceBrowser *b,
761
AvahiIfIndex interface,
762
AvahiProtocol protocol,
763
AvahiBrowserEvent event,
764
const char *name,
765
const char *type,
766
const char *domain,
767
AVAHI_GCC_UNUSED AvahiLookupResultFlags
768
flags,
769
void* userdata) {
770
mandos_context *mc = userdata;
1054
771
assert(b);
1055
772
1056
773
/* Called whenever a new services becomes available on the LAN or
1057
774
is removed from the LAN */
1058
775
1059
if(quit_now){
1060
return;
1061
}
1062
1063
switch(event){
776
switch (event) {
1064
777
default:
1065
778
case AVAHI_BROWSER_FAILURE:
1066
779
1067
fprintf_plus(stderr, "(Avahi browser) %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
avahi_simple_poll_quit(mc.simple_poll);
780
fprintf(stderr, "(Avahi browser) %s\n",
781
avahi_strerror(avahi_server_errno(mc->server)));
782
avahi_simple_poll_quit(mc->simple_poll);
1070
783
return;
1071
784
1072
785
case AVAHI_BROWSER_NEW:
1075
788
the callback function is called the Avahi server will free the
1076
789
resolver for us. */
1077
790
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)));
791
if (!(avahi_s_service_resolver_new(mc->server, interface,
792
protocol, name, type, domain,
793
AVAHI_PROTO_INET6, 0,
794
resolve_callback, mc)))
795
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
796
name, avahi_strerror(avahi_server_errno(mc->server)));
1084
797
break;
1085
798
1086
799
case AVAHI_BROWSER_REMOVE:
1089
802
case AVAHI_BROWSER_ALL_FOR_NOW:
1090
803
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1091
804
if(debug){
1092
fprintf_plus(stderr, "No Mandos server found, still"
1093
" searching...\n");
805
fprintf(stderr, "No Mandos server found, still searching...\n");
1094
806
}
1095
807
break;
1096
808
}
1097
809
}
1098
810
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
}
1513
1514
811
int main(int argc, char *argv[]){
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");
1806
exitcode = EXIT_FAILURE;
1807
goto end;
1808
}
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){
812
AvahiSServiceBrowser *sb = NULL;
813
int error;
814
int ret;
815
int exitcode = EXIT_SUCCESS;
816
const char *interface = "eth0";
817
struct ifreq network;
818
int sd;
819
uid_t uid;
820
gid_t gid;
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
823
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
826
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
832
833
{
834
struct argp_option options[] = {
835
{ .name = "debug", .key = 128,
836
.doc = "Debug mode", .group = 3 },
837
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
840
.group = 1 },
841
{ .name = "interface", .key = 'i',
842
.arg = "NAME",
843
.doc = "Interface that will be used to search for Mandos"
844
" servers",
845
.group = 1 },
846
{ .name = "seckey", .key = 's',
847
.arg = "FILE",
848
.doc = "OpenPGP secret key file base name",
849
.group = 1 },
850
{ .name = "pubkey", .key = 'p',
851
.arg = "FILE",
852
.doc = "OpenPGP public key file base name",
853
.group = 2 },
854
{ .name = "dh-bits", .key = 129,
855
.arg = "BITS",
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
858
.group = 2 },
859
{ .name = "priority", .key = 130,
860
.arg = "STRING",
861
.doc = "GnuTLS priority string for the TLS handshake",
862
.group = 1 },
863
{ .name = NULL }
864
};
865
866
error_t parse_opt (int key, char *arg,
867
struct argp_state *state) {
868
/* Get the INPUT argument from `argp_parse', which we know is
869
a pointer to our plugin list pointer. */
870
switch (key) {
871
case 128: /* --debug */
872
debug = true;
873
break;
874
case 'c': /* --connect */
875
connect_to = arg;
876
break;
877
case 'i': /* --interface */
878
interface = arg;
879
break;
880
case 's': /* --seckey */
881
seckey = arg;
882
break;
883
case 'p': /* --pubkey */
884
pubkey = arg;
885
break;
886
case 129: /* --dh-bits */
887
errno = 0;
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
889
if (errno){
890
perror("strtol");
891
exit(EXIT_FAILURE);
892
}
893
break;
894
case 130: /* --priority */
895
mc.priority = arg;
896
break;
897
case ARGP_KEY_ARG:
898
argp_usage (state);
899
case ARGP_KEY_END:
900
break;
901
default:
902
return ARGP_ERR_UNKNOWN;
903
}
904
return 0;
905
}
906
907
struct argp argp = { .options = options, .parser = parse_opt,
908
.args_doc = "",
909
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
if (ret == ARGP_ERR_UNKNOWN){
913
fprintf(stderr, "Unknown error while parsing arguments\n");
914
exitcode = EXIT_FAILURE;
915
goto end;
916
}
917
}
918
919
/* If the interface is down, bring it up */
920
{
921
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
922
if(sd < 0) {
923
perror("socket");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
strcpy(network.ifr_name, interface);
928
ret = ioctl(sd, SIOCGIFFLAGS, &network);
929
if(ret == -1){
930
perror("ioctl SIOCGIFFLAGS");
931
exitcode = EXIT_FAILURE;
932
goto end;
933
}
934
if((network.ifr_flags & IFF_UP) == 0){
935
network.ifr_flags |= IFF_UP;
936
ret = ioctl(sd, SIOCSIFFLAGS, &network);
937
if(ret == -1){
938
perror("ioctl SIOCSIFFLAGS");
939
exitcode = EXIT_FAILURE;
940
goto end;
941
}
942
}
943
ret = TEMP_FAILURE_RETRY(close(sd));
944
if(ret == -1){
945
perror("close");
946
}
947
}
948
949
uid = getuid();
950
gid = getgid();
951
952
ret = setuid(uid);
953
if (ret == -1){
954
perror("setuid");
955
}
956
957
setgid(gid);
958
if (ret == -1){
959
perror("setgid");
960
}
961
962
ret = init_gnutls_global(&mc, pubkey, seckey);
963
if (ret == -1){
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
966
goto end;
967
} else {
968
gnutls_initalized = true;
969
}
970
971
if(mkdtemp(tempdir) == NULL){
972
perror("mkdtemp");
973
tempdir[0] = '\0';
974
goto end;
975
}
976
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
} else {
982
gpgme_initalized = true;
983
}
984
1888
985
if_index = (AvahiIfIndex) if_nametoindex(interface);
1889
986
if(if_index == 0){
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
987
fprintf(stderr, "No such interface: \"%s\"\n", interface);
988
exit(EXIT_FAILURE);
989
}
990
991
if(connect_to != NULL){
992
/* Connect directly, do not use Zeroconf */
993
/* (Mainly meant for debugging) */
994
char *address = strrchr(connect_to, ':');
995
if(address == NULL){
996
fprintf(stderr, "No colon in address\n");
997
exitcode = EXIT_FAILURE;
998
goto end;
999
}
1000
errno = 0;
1001
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1002
if(errno){
1003
perror("Bad port number");
1004
exitcode = EXIT_FAILURE;
1005
goto end;
1006
}
1007
*address = '\0';
1008
address = connect_to;
1009
ret = start_mandos_communication(address, port, if_index, &mc);
1010
if(ret < 0){
1011
exitcode = EXIT_FAILURE;
1012
} else {
1013
exitcode = EXIT_SUCCESS;
1014
}
1015
goto end;
1016
}
1017
1018
if (not debug){
1019
avahi_set_log_function(empty_log);
1020
}
1021
1022
/* Initialize the pseudo-RNG for Avahi */
1023
srand((unsigned int) time(NULL));
1024
1025
/* Allocate main Avahi loop object */
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if (mc.simple_poll == NULL) {
1028
fprintf(stderr, "Avahi: Failed to create simple poll"
1029
" object.\n");
1030
exitcode = EXIT_FAILURE;
1031
goto end;
1032
}
1033
1034
{
1035
AvahiServerConfig config;
1036
/* Do not publish any local Zeroconf records */
1037
avahi_server_config_init(&config);
1038
config.publish_hinfo = 0;
1039
config.publish_addresses = 0;
1040
config.publish_workstation = 0;
1041
config.publish_domain = 0;
1042
1043
/* Allocate a new server */
1044
mc.server = avahi_server_new(avahi_simple_poll_get
1045
(mc.simple_poll), &config, NULL,
1046
NULL, &error);
1047
1048
/* Free the Avahi configuration data */
1049
avahi_server_config_free(&config);
1050
}
1051
1052
/* Check if creating the Avahi server object succeeded */
1053
if (mc.server == NULL) {
1054
fprintf(stderr, "Failed to create Avahi server: %s\n",
1055
avahi_strerror(error));
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* Create the Avahi service browser */
1061
sb = avahi_s_service_browser_new(mc.server, if_index,
1062
AVAHI_PROTO_INET6,
1063
"_mandos._tcp", NULL, 0,
1064
browse_callback, &mc);
1065
if (sb == NULL) {
1066
fprintf(stderr, "Failed to create service browser: %s\n",
1067
avahi_strerror(avahi_server_errno(mc.server)));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Run the main loop */
1073
1074
if (debug){
1075
fprintf(stderr, "Starting Avahi loop search\n");
1076
}
1077
1078
avahi_simple_poll_loop(mc.simple_poll);
1079
2192
1080
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 */
2247
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2248
if(ret == -1){
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;
1081
1082
if (debug){
1083
fprintf(stderr, "%s exiting\n", argv[0]);
1084
}
1085
1086
/* Cleanup things */
1087
if (sb != NULL)
1088
avahi_s_service_browser_free(sb);
1089
1090
if (mc.server != NULL)
1091
avahi_server_free(mc.server);
1092
1093
if (mc.simple_poll != NULL)
1094
avahi_simple_poll_free(mc.simple_poll);
1095
1096
if (gnutls_initalized){
1097
gnutls_certificate_free_credentials(mc.cred);
1098
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1100
}
1101
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1104
}
1105
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1108
DIR *d;
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1111
if(d == NULL){
1112
perror("opendir");
1113
} else {
1114
while(true){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1117
break;
1118
}
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1122
direntry->d_name);
1123
if(ret < 0){
1124
perror("asprintf");
1125
continue;
1126
}
1127
ret = unlink(fullname);
1128
if(ret == -1){
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1131
}
1132
free(fullname);
1133
}
1134
}
1135
closedir(d);
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
2321
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0