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» Revision
237.7.309
(compared to revision 24.1.23)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-07 15:49:49 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150707154949-vbuj4pc6wf3o1vgz
mandos.service: Use Type=dbus (implicitly).
mandos.service ([Service]/Type): Removed.
([Service]/BusName): Uncommented; set to
"se.recompile.Mandos".
mandos.service ([Service]/Type): Removed.
([Service]/BusName): Uncommented; set to
"se.recompile.Mandos".
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- network-protocol.txt
- files renamed:
- clients.conf.xml => mandos-clients.conf.xml
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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 /* not _LARGEFILE_SOURCE */
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>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
38
#endif /* not _FILE_OFFSET_BITS */
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
44
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
46
69
SIOCSIFFLAGS, if_indextoname(),
70
if_nametoindex(), IF_NAMESIZE */
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
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
80
#include <argp.h> /* struct argp_option, error_t, struct
81
argp_state, struct argp,
82
argp_parse(), ARGP_KEY_ARG,
83
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
99
#ifdef __linux__
100
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
102
103
/* Avahi */
104
/* All Avahi types, constants and functions
105
Avahi*, avahi_*,
106
AVAHI_* */
47
107
#include <avahi-core/core.h>
48
108
#include <avahi-core/lookup.h>
49
109
#include <avahi-core/log.h>
51
111
#include <avahi-common/malloc.h>
52
112
#include <avahi-common/error.h>
53
113
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
114
/* GnuTLS */
115
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
116
functions:
117
gnutls_*
118
init_gnutls_session(),
119
GNUTLS_* */
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
60
123
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
124
/* GPGME */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
125
#include <gpgme.h> /* All GPGME types, constants and
126
functions:
127
gpgme_*
128
GPGME_PROTOCOL_OpenPGP,
129
GPG_ERR_NO_* */
74
130
75
131
#define BUFFER_SIZE 256
76
132
133
#define PATHDIR "/conf/conf.d/mandos"
134
#define SECKEY "seckey.txt"
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
77
138
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
139
static const char mandos_protocol_version[] = "1";
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
82
159
83
160
/* Used for passing in values through the Avahi callback functions */
84
161
typedef struct {
85
AvahiSimplePoll *simple_poll;
86
162
AvahiServer *server;
87
163
gnutls_certificate_credentials_t cred;
88
164
unsigned int dh_bits;
89
165
gnutls_dh_params_t dh_params;
90
166
const char *priority;
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
91
171
} mandos_context;
92
172
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
93
198
/*
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
96
201
* "buffer_length" is how much is already used.
97
202
*/
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
99
size_t buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
102
if (buffer == NULL){
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
103
213
return 0;
104
214
}
215
*buffer = new_buf;
105
216
buffer_capacity += BUFFER_SIZE;
106
217
}
107
218
return buffer_capacity;
108
219
}
109
220
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
110
269
/*
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
270
* Initialize GPGME.
113
271
*/
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
size_t crypto_size,
116
char **plaintext,
117
const char *homedir){
118
gpgme_data_t dh_crypto, dh_plain;
119
gpgme_ctx_t ctx;
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
120
277
gpgme_error_t rc;
121
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
124
278
gpgme_engine_info_t engine_info;
125
279
126
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
280
/*
281
* Helper function to insert pub and seckey to the engine keyring.
282
*/
283
bool import_key(const char * const filename){
284
int ret;
285
int fd;
286
gpgme_data_t pgp_data;
287
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
if(fd == -1){
290
perror_plus("open");
291
return false;
292
}
293
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
298
return false;
299
}
300
301
rc = gpgme_op_import(mc->ctx, pgp_data);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
305
return false;
306
}
307
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
if(ret == -1){
310
perror_plus("close");
311
}
312
gpgme_data_release(pgp_data);
313
return true;
314
}
315
316
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
128
318
}
129
319
130
320
/* Init GPGME */
131
321
gpgme_check_version(NULL);
132
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
136
return -1;
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
326
return false;
137
327
}
138
328
139
329
/* Set GPGME home directory for the OpenPGP engine only */
140
rc = gpgme_get_engine_info (&engine_info);
141
if (rc != GPG_ERR_NO_ERROR){
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
143
gpgme_strsource(rc), gpgme_strerror(rc));
144
return -1;
330
rc = gpgme_get_engine_info(&engine_info);
331
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
334
return false;
145
335
}
146
336
while(engine_info != NULL){
147
337
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
148
338
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
149
engine_info->file_name, homedir);
339
engine_info->file_name, tempdir);
150
340
break;
151
341
}
152
342
engine_info = engine_info->next;
153
343
}
154
344
if(engine_info == NULL){
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
156
return -1;
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
347
return false;
348
}
349
350
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
356
return false;
357
}
358
359
if(not import_key(pubkey) or not import_key(seckey)){
360
return false;
361
}
362
363
return true;
364
}
365
366
/*
367
* Decrypt OpenPGP data.
368
* Returns -1 on error
369
*/
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
375
gpgme_data_t dh_crypto, dh_plain;
376
gpgme_error_t rc;
377
ssize_t ret;
378
size_t plaintext_capacity = 0;
379
ssize_t plaintext_length = 0;
380
381
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
157
383
}
158
384
159
385
/* Create new GPGME data buffer from memory cryptotext */
160
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
387
0);
162
if (rc != GPG_ERR_NO_ERROR){
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
gpgme_strsource(rc), gpgme_strerror(rc));
388
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
165
391
return -1;
166
392
}
167
393
168
394
/* Create new empty GPGME data buffer for the plaintext */
169
395
rc = gpgme_data_new(&dh_plain);
170
if (rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
173
400
gpgme_data_release(dh_crypto);
174
401
return -1;
175
402
}
176
403
177
/* Create new GPGME "context" */
178
rc = gpgme_new(&ctx);
179
if (rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
184
}
185
186
404
/* Decrypt data from the cryptotext data buffer to the plaintext
187
405
data buffer */
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
if (rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
192
410
plaintext_length = -1;
193
goto decrypt_end;
194
}
195
196
if(debug){
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
198
}
199
200
if (debug){
201
gpgme_decrypt_result_t result;
202
result = gpgme_op_decrypt_result(ctx);
203
if (result == NULL){
204
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
205
} else {
206
fprintf(stderr, "Unsupported algorithm: %s\n",
207
result->unsupported_algorithm);
208
fprintf(stderr, "Wrong key usage: %d\n",
209
result->wrong_key_usage);
210
if(result->file_name != NULL){
211
fprintf(stderr, "File name: %s\n", result->file_name);
212
}
213
gpgme_recipient_t recipient;
214
recipient = result->recipients;
215
if(recipient){
411
if(debug){
412
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
414
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
421
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
423
}
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
216
426
while(recipient != NULL){
217
fprintf(stderr, "Public key algorithm: %s\n",
218
gpgme_pubkey_algo_name(recipient->pubkey_algo));
219
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
220
fprintf(stderr, "Secret key available: %s\n",
221
recipient->status == GPG_ERR_NO_SECKEY
222
? "No" : "Yes");
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
223
434
recipient = recipient->next;
224
435
}
225
436
}
226
437
}
438
goto decrypt_end;
439
}
440
441
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
227
443
}
228
444
229
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
232
448
plaintext_length = -1;
233
449
goto decrypt_end;
234
450
}
235
451
236
452
*plaintext = NULL;
237
453
while(true){
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
240
plaintext_capacity);
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
244
goto decrypt_end;
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
457
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
245
461
}
246
462
247
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
248
464
BUFFER_SIZE);
249
465
/* Print the data, if any */
250
if (ret == 0){
466
if(ret == 0){
251
467
/* EOF */
252
468
break;
253
469
}
254
470
if(ret < 0){
255
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
256
472
plaintext_length = -1;
257
473
goto decrypt_end;
258
474
}
259
475
plaintext_length += ret;
260
476
}
261
477
262
478
if(debug){
263
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
264
480
for(ssize_t i = 0; i < plaintext_length; i++){
265
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
266
482
}
277
493
return plaintext_length;
278
494
}
279
495
280
static const char * safer_gnutls_strerror (int value) {
281
const char *ret = gnutls_strerror (value);
282
if (ret == NULL)
283
ret = "(unknown)";
284
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
285
507
}
286
508
287
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
288
511
static void debuggnutls(__attribute__((unused)) int level,
289
512
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
291
514
}
292
515
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
516
__attribute__((nonnull, warn_unused_result))
517
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
mandos_context *mc){
296
520
int ret;
521
unsigned int uret;
297
522
298
523
if(debug){
299
fprintf(stderr, "Initializing GnuTLS\n");
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
300
525
}
301
302
if ((ret = gnutls_global_init ())
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
526
527
ret = gnutls_global_init();
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
306
531
return -1;
307
532
}
308
533
309
if (debug){
534
if(debug){
310
535
/* "Use a log level over 10 to enable all debugging options."
311
536
* - GnuTLS manual
312
537
*/
315
540
}
316
541
317
542
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
319
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
321
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
323
548
return -1;
324
549
}
325
550
326
551
if(debug){
327
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
554
pubkeyfilename,
555
seckeyfilename);
330
556
}
331
557
332
558
ret = gnutls_certificate_set_openpgp_key_file
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
334
if (ret != GNUTLS_E_SUCCESS) {
335
fprintf(stderr,
336
"Error[%d] while reading the OpenPGP key pair ('%s',"
337
" '%s')\n", ret, pubkeyfile, seckeyfile);
338
fprintf(stdout, "The GnuTLS error is: %s\n",
339
safer_gnutls_strerror(ret));
559
(mc->cred, pubkeyfilename, seckeyfilename,
560
GNUTLS_OPENPGP_FMT_BASE64);
561
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr,
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
safer_gnutls_strerror(ret));
340
567
goto globalfail;
341
568
}
342
569
343
570
/* GnuTLS server initialization */
344
571
ret = gnutls_dh_params_init(&mc->dh_params);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
347
" %s\n", safer_gnutls_strerror(ret));
572
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
348
576
goto globalfail;
349
577
}
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
350
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
351
if (ret != GNUTLS_E_SUCCESS) {
352
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
353
safer_gnutls_strerror(ret));
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
354
683
goto globalfail;
355
684
}
356
685
357
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
358
687
359
688
return 0;
360
689
361
690
globalfail:
362
363
gnutls_certificate_free_credentials (mc->cred);
364
gnutls_global_deinit ();
691
692
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
694
gnutls_dh_params_deinit(mc->dh_params);
365
695
return -1;
366
367
696
}
368
697
369
static int init_gnutls_session(mandos_context *mc,
370
gnutls_session_t *session){
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
371
701
int ret;
372
702
/* GnuTLS session creation */
373
ret = gnutls_init(session, GNUTLS_SERVER);
374
if (ret != GNUTLS_E_SUCCESS){
375
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
376
safer_gnutls_strerror(ret));
703
do {
704
ret = gnutls_init(session, GNUTLS_SERVER);
705
if(quit_now){
706
return -1;
707
}
708
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
709
if(ret != GNUTLS_E_SUCCESS){
710
fprintf_plus(stderr,
711
"Error in GnuTLS session initialization: %s\n",
712
safer_gnutls_strerror(ret));
377
713
}
378
714
379
715
{
380
716
const char *err;
381
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
382
if (ret != GNUTLS_E_SUCCESS) {
383
fprintf(stderr, "Syntax error at: %s\n", err);
384
fprintf(stderr, "GnuTLS error: %s\n",
385
safer_gnutls_strerror(ret));
386
gnutls_deinit (*session);
717
do {
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
719
if(quit_now){
720
gnutls_deinit(*session);
721
return -1;
722
}
723
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
724
if(ret != GNUTLS_E_SUCCESS){
725
fprintf_plus(stderr, "Syntax error at: %s\n", err);
726
fprintf_plus(stderr, "GnuTLS error: %s\n",
727
safer_gnutls_strerror(ret));
728
gnutls_deinit(*session);
387
729
return -1;
388
730
}
389
731
}
390
732
391
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
392
mc->cred);
393
if (ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
395
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
733
do {
734
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
735
mc->cred);
736
if(quit_now){
737
gnutls_deinit(*session);
738
return -1;
739
}
740
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
743
safer_gnutls_strerror(ret));
744
gnutls_deinit(*session);
397
745
return -1;
398
746
}
399
747
400
748
/* ignore client certificate if any. */
401
gnutls_certificate_server_set_request (*session,
402
GNUTLS_CERT_IGNORE);
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
403
750
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
405
752
406
753
return 0;
407
754
}
410
757
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
411
758
__attribute__((unused)) const char *txt){}
412
759
760
/* Set effective uid to 0, return errno */
761
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
765
if(seteuid(0) == -1){
766
ret_errno = errno;
767
}
768
errno = old_errno;
769
return ret_errno;
770
}
771
772
/* Set effective and real user ID to 0. Return errno. */
773
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
777
if(ret_errno != 0){
778
errno = old_errno;
779
return ret_errno;
780
}
781
if(setuid(0) == -1){
782
ret_errno = errno;
783
}
784
errno = old_errno;
785
return ret_errno;
786
}
787
788
/* Set effective user ID to unprivileged saved user ID */
789
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
793
if(seteuid(uid) == -1){
794
ret_errno = errno;
795
}
796
errno = old_errno;
797
return ret_errno;
798
}
799
800
/* Lower privileges permanently */
801
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
805
if(setuid(uid) == -1){
806
ret_errno = errno;
807
}
808
errno = old_errno;
809
return ret_errno;
810
}
811
812
/* Helper function to add_local_route() and delete_local_route() */
813
__attribute__((nonnull, warn_unused_result))
814
static bool add_delete_local_route(const bool add,
815
const char *address,
816
AvahiIfIndex if_index){
817
int ret;
818
char helper[] = "mandos-client-iprouteadddel";
819
char add_arg[] = "add";
820
char delete_arg[] = "delete";
821
char debug_flag[] = "--debug";
822
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
823
if(pluginhelperdir == NULL){
824
if(debug){
825
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
826
" variable not set; cannot run helper\n");
827
}
828
return false;
829
}
830
831
char interface[IF_NAMESIZE];
832
if(if_indextoname((unsigned int)if_index, interface) == NULL){
833
perror_plus("if_indextoname");
834
return false;
835
}
836
837
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
838
if(devnull == -1){
839
perror_plus("open(\"/dev/null\", O_RDONLY)");
840
return false;
841
}
842
pid_t pid = fork();
843
if(pid == 0){
844
/* Child */
845
/* Raise privileges */
846
errno = raise_privileges_permanently();
847
if(errno != 0){
848
perror_plus("Failed to raise privileges");
849
/* _exit(EX_NOPERM); */
850
} else {
851
/* Set group */
852
errno = 0;
853
ret = setgid(0);
854
if(ret == -1){
855
perror_plus("setgid");
856
_exit(EX_NOPERM);
857
}
858
/* Reset supplementary groups */
859
errno = 0;
860
ret = setgroups(0, NULL);
861
if(ret == -1){
862
perror_plus("setgroups");
863
_exit(EX_NOPERM);
864
}
865
}
866
ret = dup2(devnull, STDIN_FILENO);
867
if(ret == -1){
868
perror_plus("dup2(devnull, STDIN_FILENO)");
869
_exit(EX_OSERR);
870
}
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
872
if(ret == -1){
873
perror_plus("close");
874
_exit(EX_OSERR);
875
}
876
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
877
if(ret == -1){
878
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
879
_exit(EX_OSERR);
880
}
881
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
882
O_RDONLY
883
| O_DIRECTORY
884
| O_PATH
885
| O_CLOEXEC));
886
if(helperdir_fd == -1){
887
perror_plus("open");
888
_exit(EX_UNAVAILABLE);
889
}
890
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
891
helper, O_RDONLY));
892
if(helper_fd == -1){
893
perror_plus("openat");
894
_exit(EX_UNAVAILABLE);
895
}
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
897
#ifdef __GNUC__
898
#pragma GCC diagnostic push
899
#pragma GCC diagnostic ignored "-Wcast-qual"
900
#endif
901
if(fexecve(helper_fd, (char *const [])
902
{ helper, add ? add_arg : delete_arg, (char *)address,
903
interface, debug ? debug_flag : NULL, NULL },
904
environ) == -1){
905
#ifdef __GNUC__
906
#pragma GCC diagnostic pop
907
#endif
908
perror_plus("fexecve");
909
_exit(EXIT_FAILURE);
910
}
911
}
912
if(pid == -1){
913
perror_plus("fork");
914
return false;
915
}
916
int status;
917
pid_t pret = -1;
918
errno = 0;
919
do {
920
pret = waitpid(pid, &status, 0);
921
if(pret == -1 and errno == EINTR and quit_now){
922
int errno_raising = 0;
923
if((errno = raise_privileges()) != 0){
924
errno_raising = errno;
925
perror_plus("Failed to raise privileges in order to"
926
" kill helper program");
927
}
928
if(kill(pid, SIGTERM) == -1){
929
perror_plus("kill");
930
}
931
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
932
perror_plus("Failed to lower privileges after killing"
933
" helper program");
934
}
935
return false;
936
}
937
} while(pret == -1 and errno == EINTR);
938
if(pret == -1){
939
perror_plus("waitpid");
940
return false;
941
}
942
if(WIFEXITED(status)){
943
if(WEXITSTATUS(status) != 0){
944
fprintf_plus(stderr, "Error: iprouteadddel exited"
945
" with status %d\n", WEXITSTATUS(status));
946
return false;
947
}
948
return true;
949
}
950
if(WIFSIGNALED(status)){
951
fprintf_plus(stderr, "Error: iprouteadddel died by"
952
" signal %d\n", WTERMSIG(status));
953
return false;
954
}
955
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
956
return false;
957
}
958
959
__attribute__((nonnull, warn_unused_result))
960
static bool add_local_route(const char *address,
961
AvahiIfIndex if_index){
962
if(debug){
963
fprintf_plus(stderr, "Adding route to %s\n", address);
964
}
965
return add_delete_local_route(true, address, if_index);
966
}
967
968
__attribute__((nonnull, warn_unused_result))
969
static bool delete_local_route(const char *address,
970
AvahiIfIndex if_index){
971
if(debug){
972
fprintf_plus(stderr, "Removing route to %s\n", address);
973
}
974
return add_delete_local_route(false, address, if_index);
975
}
976
413
977
/* Called when a Mandos server is found */
414
static int start_mandos_communication(const char *ip, uint16_t port,
978
__attribute__((nonnull, warn_unused_result))
979
static int start_mandos_communication(const char *ip, in_port_t port,
415
980
AvahiIfIndex if_index,
416
mandos_context *mc){
417
int ret, tcp_sd;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
981
int af, mandos_context *mc){
982
int ret, tcp_sd = -1;
983
ssize_t sret;
984
struct sockaddr_storage to;
419
985
char *buffer = NULL;
420
char *decrypted_buffer;
986
char *decrypted_buffer = NULL;
421
987
size_t buffer_length = 0;
422
988
size_t buffer_capacity = 0;
423
ssize_t decrypted_buffer_size;
424
989
size_t written;
425
int retval = 0;
426
char interface[IF_NAMESIZE];
990
int retval = -1;
427
991
gnutls_session_t session;
428
429
ret = init_gnutls_session (mc, &session);
430
if (ret != 0){
431
return -1;
432
}
433
434
if(debug){
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
436
ip, port);
437
}
438
439
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
440
if(tcp_sd < 0) {
441
perror("socket");
442
return -1;
443
}
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
447
perror("if_indextoname");
992
int pf; /* Protocol family */
993
bool route_added = false;
994
995
errno = 0;
996
997
if(quit_now){
998
errno = EINTR;
999
return -1;
1000
}
1001
1002
switch(af){
1003
case AF_INET6:
1004
pf = PF_INET6;
1005
break;
1006
case AF_INET:
1007
pf = PF_INET;
1008
break;
1009
default:
1010
fprintf_plus(stderr, "Bad address family: %d\n", af);
1011
errno = EINVAL;
1012
return -1;
1013
}
1014
1015
/* If the interface is specified and we have a list of interfaces */
1016
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1017
/* Check if the interface is one of the interfaces we are using */
1018
bool match = false;
1019
{
1020
char *interface = NULL;
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1022
interface))){
1023
if(if_nametoindex(interface) == (unsigned int)if_index){
1024
match = true;
1025
break;
1026
}
1027
}
1028
}
1029
if(not match){
1030
/* This interface does not match any in the list, so we don't
1031
connect to the server */
1032
if(debug){
1033
char interface[IF_NAMESIZE];
1034
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1035
perror_plus("if_indextoname");
1036
} else {
1037
fprintf_plus(stderr, "Skipping server on non-used interface"
1038
" \"%s\"\n",
1039
if_indextoname((unsigned int)if_index,
1040
interface));
1041
}
1042
}
448
1043
return -1;
449
1044
}
450
fprintf(stderr, "Binding to interface %s\n", interface);
451
1045
}
452
1046
453
memset(&to,0,sizeof(to)); /* Spurious warning */
454
to.in6.sin6_family = AF_INET6;
455
/* It would be nice to have a way to detect if we were passed an
456
IPv4 address here. Now we assume an IPv6 address. */
457
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
458
if (ret < 0 ){
459
perror("inet_pton");
1047
ret = init_gnutls_session(&session, mc);
1048
if(ret != 0){
460
1049
return -1;
461
1050
}
1051
1052
if(debug){
1053
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1054
PRIuMAX "\n", ip, (uintmax_t)port);
1055
}
1056
1057
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1058
if(tcp_sd < 0){
1059
int e = errno;
1060
perror_plus("socket");
1061
errno = e;
1062
goto mandos_end;
1063
}
1064
1065
if(quit_now){
1066
errno = EINTR;
1067
goto mandos_end;
1068
}
1069
1070
memset(&to, 0, sizeof(to));
1071
if(af == AF_INET6){
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1074
} else { /* IPv4 */
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1077
}
1078
if(ret < 0 ){
1079
int e = errno;
1080
perror_plus("inet_pton");
1081
errno = e;
1082
goto mandos_end;
1083
}
462
1084
if(ret == 0){
463
fprintf(stderr, "Bad address: %s\n", ip);
464
return -1;
465
}
466
to.in6.sin6_port = htons(port); /* Spurious warning */
1085
int e = errno;
1086
fprintf_plus(stderr, "Bad address: %s\n", ip);
1087
errno = e;
1088
goto mandos_end;
1089
}
1090
if(af == AF_INET6){
1091
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1092
if(IN6_IS_ADDR_LINKLOCAL
1093
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1094
if(if_index == AVAHI_IF_UNSPEC){
1095
fprintf_plus(stderr, "An IPv6 link-local address is"
1096
" incomplete without a network interface\n");
1097
errno = EINVAL;
1098
goto mandos_end;
1099
}
1100
/* Set the network interface number as scope */
1101
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1102
}
1103
} else {
1104
((struct sockaddr_in *)&to)->sin_port = htons(port);
1105
}
467
1106
468
to.in6.sin6_scope_id = (uint32_t)if_index;
1107
if(quit_now){
1108
errno = EINTR;
1109
goto mandos_end;
1110
}
469
1111
470
1112
if(debug){
471
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
472
char addrstr[INET6_ADDRSTRLEN] = "";
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
474
sizeof(addrstr)) == NULL){
475
perror("inet_ntop");
476
} else {
477
if(strcmp(addrstr, ip) != 0){
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
479
}
480
}
481
}
482
483
ret = connect(tcp_sd, &to.in, sizeof(to));
484
if (ret < 0){
485
perror("connect");
486
return -1;
487
}
488
1113
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1114
char interface[IF_NAMESIZE];
1115
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1116
perror_plus("if_indextoname");
1117
} else {
1118
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1119
"\n", ip, interface, (uintmax_t)port);
1120
}
1121
} else {
1122
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1123
ip, (uintmax_t)port);
1124
}
1125
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1126
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1127
if(af == AF_INET6){
1128
ret = getnameinfo((struct sockaddr *)&to,
1129
sizeof(struct sockaddr_in6),
1130
addrstr, sizeof(addrstr), NULL, 0,
1131
NI_NUMERICHOST);
1132
} else {
1133
ret = getnameinfo((struct sockaddr *)&to,
1134
sizeof(struct sockaddr_in),
1135
addrstr, sizeof(addrstr), NULL, 0,
1136
NI_NUMERICHOST);
1137
}
1138
if(ret == EAI_SYSTEM){
1139
perror_plus("getnameinfo");
1140
} else if(ret != 0) {
1141
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1142
} else if(strcmp(addrstr, ip) != 0){
1143
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1144
}
1145
}
1146
1147
if(quit_now){
1148
errno = EINTR;
1149
goto mandos_end;
1150
}
1151
1152
while(true){
1153
if(af == AF_INET6){
1154
ret = connect(tcp_sd, (struct sockaddr *)&to,
1155
sizeof(struct sockaddr_in6));
1156
} else {
1157
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1158
sizeof(struct sockaddr_in));
1159
}
1160
if(ret < 0){
1161
if(errno == ENETUNREACH
1162
and if_index != AVAHI_IF_UNSPEC
1163
and connect_to == NULL
1164
and not route_added and
1165
((af == AF_INET6 and not
1166
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1167
&to)->sin6_addr)))
1168
or (af == AF_INET and
1169
/* Not a a IPv4LL address */
1170
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1171
& 0xFFFF0000L) != 0xA9FE0000L))){
1172
/* Work around Avahi bug - Avahi does not announce link-local
1173
addresses if it has a global address, so local hosts with
1174
*only* a link-local address (e.g. Mandos clients) cannot
1175
connect to a Mandos server announced by Avahi on a server
1176
host with a global address. Work around this by retrying
1177
with an explicit route added with the server's address.
1178
1179
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
https://bugs.debian.org/587961
1182
*/
1183
if(debug){
1184
fprintf_plus(stderr, "Mandos server unreachable, trying"
1185
" direct route\n");
1186
}
1187
int e = errno;
1188
route_added = add_local_route(ip, if_index);
1189
if(route_added){
1190
continue;
1191
}
1192
errno = e;
1193
}
1194
if(errno != ECONNREFUSED or debug){
1195
int e = errno;
1196
perror_plus("connect");
1197
errno = e;
1198
}
1199
goto mandos_end;
1200
}
1201
1202
if(quit_now){
1203
errno = EINTR;
1204
goto mandos_end;
1205
}
1206
break;
1207
}
1208
489
1209
const char *out = mandos_protocol_version;
490
1210
written = 0;
491
while (true){
1211
while(true){
492
1212
size_t out_size = strlen(out);
493
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
494
out_size - written));
495
if (ret == -1){
496
perror("write");
497
retval = -1;
1213
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1214
out_size - written));
1215
if(ret == -1){
1216
int e = errno;
1217
perror_plus("write");
1218
errno = e;
498
1219
goto mandos_end;
499
1220
}
500
1221
written += (size_t)ret;
501
1222
if(written < out_size){
502
1223
continue;
503
1224
} else {
504
if (out == mandos_protocol_version){
1225
if(out == mandos_protocol_version){
505
1226
written = 0;
506
1227
out = "\r\n";
507
1228
} else {
508
1229
break;
509
1230
}
510
1231
}
1232
1233
if(quit_now){
1234
errno = EINTR;
1235
goto mandos_end;
1236
}
511
1237
}
512
1238
513
1239
if(debug){
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
515
}
516
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
520
521
if (ret != GNUTLS_E_SUCCESS){
1240
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1241
}
1242
1243
if(quit_now){
1244
errno = EINTR;
1245
goto mandos_end;
1246
}
1247
1248
/* This casting via intptr_t is to eliminate warning about casting
1249
an int to a pointer type. This is exactly how the GnuTLS Guile
1250
function "set-session-transport-fd!" does it. */
1251
gnutls_transport_set_ptr(session,
1252
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1253
1254
if(quit_now){
1255
errno = EINTR;
1256
goto mandos_end;
1257
}
1258
1259
do {
1260
ret = gnutls_handshake(session);
1261
if(quit_now){
1262
errno = EINTR;
1263
goto mandos_end;
1264
}
1265
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1266
1267
if(ret != GNUTLS_E_SUCCESS){
522
1268
if(debug){
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
524
gnutls_perror (ret);
1269
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
1270
gnutls_perror(ret);
525
1271
}
526
retval = -1;
1272
errno = EPROTO;
527
1273
goto mandos_end;
528
1274
}
529
1275
530
1276
/* Read OpenPGP packet that contains the wanted password */
531
1277
532
1278
if(debug){
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
534
ip);
1279
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1280
" %s\n", ip);
535
1281
}
536
1282
537
1283
while(true){
538
buffer_capacity = adjustbuffer(&buffer, buffer_length,
539
buffer_capacity);
540
if (buffer_capacity == 0){
541
perror("adjustbuffer");
542
retval = -1;
543
goto mandos_end;
544
}
545
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
548
if (ret == 0){
1284
1285
if(quit_now){
1286
errno = EINTR;
1287
goto mandos_end;
1288
}
1289
1290
buffer_capacity = incbuffer(&buffer, buffer_length,
1291
buffer_capacity);
1292
if(buffer_capacity == 0){
1293
int e = errno;
1294
perror_plus("incbuffer");
1295
errno = e;
1296
goto mandos_end;
1297
}
1298
1299
if(quit_now){
1300
errno = EINTR;
1301
goto mandos_end;
1302
}
1303
1304
sret = gnutls_record_recv(session, buffer+buffer_length,
1305
BUFFER_SIZE);
1306
if(sret == 0){
549
1307
break;
550
1308
}
551
if (ret < 0){
552
switch(ret){
1309
if(sret < 0){
1310
switch(sret){
553
1311
case GNUTLS_E_INTERRUPTED:
554
1312
case GNUTLS_E_AGAIN:
555
1313
break;
556
1314
case GNUTLS_E_REHANDSHAKE:
557
ret = gnutls_handshake (session);
558
if (ret < 0){
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
560
gnutls_perror (ret);
561
retval = -1;
1315
do {
1316
ret = gnutls_handshake(session);
1317
1318
if(quit_now){
1319
errno = EINTR;
1320
goto mandos_end;
1321
}
1322
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1323
if(ret < 0){
1324
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1325
"***\n");
1326
gnutls_perror(ret);
1327
errno = EPROTO;
562
1328
goto mandos_end;
563
1329
}
564
1330
break;
565
1331
default:
566
fprintf(stderr, "Unknown error while reading data from"
567
" encrypted session with Mandos server\n");
568
retval = -1;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1332
fprintf_plus(stderr, "Unknown error while reading data from"
1333
" encrypted session with Mandos server\n");
1334
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1335
errno = EIO;
570
1336
goto mandos_end;
571
1337
}
572
1338
} else {
573
buffer_length += (size_t) ret;
1339
buffer_length += (size_t) sret;
574
1340
}
575
1341
}
576
1342
577
1343
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
583
if (buffer_length > 0){
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
585
buffer_length,
586
&decrypted_buffer,
587
keydir);
588
if (decrypted_buffer_size >= 0){
1344
fprintf_plus(stderr, "Closing TLS session\n");
1345
}
1346
1347
if(quit_now){
1348
errno = EINTR;
1349
goto mandos_end;
1350
}
1351
1352
do {
1353
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1354
if(quit_now){
1355
errno = EINTR;
1356
goto mandos_end;
1357
}
1358
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1359
1360
if(buffer_length > 0){
1361
ssize_t decrypted_buffer_size;
1362
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1363
&decrypted_buffer, mc);
1364
if(decrypted_buffer_size >= 0){
1365
589
1366
written = 0;
590
1367
while(written < (size_t) decrypted_buffer_size){
591
ret = (int)fwrite (decrypted_buffer + written, 1,
592
(size_t)decrypted_buffer_size - written,
593
stdout);
1368
if(quit_now){
1369
errno = EINTR;
1370
goto mandos_end;
1371
}
1372
1373
ret = (int)fwrite(decrypted_buffer + written, 1,
1374
(size_t)decrypted_buffer_size - written,
1375
stdout);
594
1376
if(ret == 0 and ferror(stdout)){
1377
int e = errno;
595
1378
if(debug){
596
fprintf(stderr, "Error writing encrypted data: %s\n",
597
strerror(errno));
1379
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1380
strerror(errno));
598
1381
}
599
retval = -1;
600
break;
1382
errno = e;
1383
goto mandos_end;
601
1384
}
602
1385
written += (size_t)ret;
603
1386
}
604
free(decrypted_buffer);
605
} else {
606
retval = -1;
1387
retval = 0;
607
1388
}
608
1389
}
609
1390
610
1391
/* Shutdown procedure */
611
1392
612
1393
mandos_end:
613
free(buffer);
614
close(tcp_sd);
615
gnutls_deinit (session);
1394
{
1395
if(route_added){
1396
if(not delete_local_route(ip, if_index)){
1397
fprintf_plus(stderr, "Failed to delete local route to %s on"
1398
" interface %d", ip, if_index);
1399
}
1400
}
1401
int e = errno;
1402
free(decrypted_buffer);
1403
free(buffer);
1404
if(tcp_sd >= 0){
1405
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1406
}
1407
if(ret == -1){
1408
if(e == 0){
1409
e = errno;
1410
}
1411
perror_plus("close");
1412
}
1413
gnutls_deinit(session);
1414
errno = e;
1415
if(quit_now){
1416
errno = EINTR;
1417
retval = -1;
1418
}
1419
}
616
1420
return retval;
617
1421
}
618
1422
1423
__attribute__((nonnull))
619
1424
static void resolve_callback(AvahiSServiceResolver *r,
620
1425
AvahiIfIndex interface,
621
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1426
AvahiProtocol proto,
622
1427
AvahiResolverEvent event,
623
1428
const char *name,
624
1429
const char *type,
629
1434
AVAHI_GCC_UNUSED AvahiStringList *txt,
630
1435
AVAHI_GCC_UNUSED AvahiLookupResultFlags
631
1436
flags,
632
void* userdata) {
633
mandos_context *mc = userdata;
634
assert(r); /* Spurious warning */
1437
void *mc){
1438
if(r == NULL){
1439
return;
1440
}
635
1441
636
1442
/* Called whenever a service has been resolved successfully or
637
1443
timed out */
638
1444
639
switch (event) {
1445
if(quit_now){
1446
avahi_s_service_resolver_free(r);
1447
return;
1448
}
1449
1450
switch(event){
640
1451
default:
641
1452
case AVAHI_RESOLVER_FAILURE:
642
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
643
" of type '%s' in domain '%s': %s\n", name, type, domain,
644
avahi_strerror(avahi_server_errno(mc->server)));
1453
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1454
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1455
domain,
1456
avahi_strerror(avahi_server_errno
1457
(((mandos_context*)mc)->server)));
645
1458
break;
646
1459
647
1460
case AVAHI_RESOLVER_FOUND:
649
1462
char ip[AVAHI_ADDRESS_STR_MAX];
650
1463
avahi_address_snprint(ip, sizeof(ip), address);
651
1464
if(debug){
652
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
653
" port %d\n", name, host_name, ip, interface, port);
1465
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1466
PRIdMAX ") on port %" PRIu16 "\n", name,
1467
host_name, ip, (intmax_t)interface, port);
654
1468
}
655
int ret = start_mandos_communication(ip, port, interface, mc);
656
if (ret == 0){
657
exit(EXIT_SUCCESS);
1469
int ret = start_mandos_communication(ip, (in_port_t)port,
1470
interface,
1471
avahi_proto_to_af(proto),
1472
mc);
1473
if(ret == 0){
1474
avahi_simple_poll_quit(simple_poll);
1475
} else {
1476
if(not add_server(ip, (in_port_t)port, interface,
1477
avahi_proto_to_af(proto),
1478
&((mandos_context*)mc)->current_server)){
1479
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1480
" list\n", name);
1481
}
658
1482
}
659
1483
}
660
1484
}
661
1485
avahi_s_service_resolver_free(r);
662
1486
}
663
1487
664
static void browse_callback( AvahiSServiceBrowser *b,
665
AvahiIfIndex interface,
666
AvahiProtocol protocol,
667
AvahiBrowserEvent event,
668
const char *name,
669
const char *type,
670
const char *domain,
671
AVAHI_GCC_UNUSED AvahiLookupResultFlags
672
flags,
673
void* userdata) {
674
mandos_context *mc = userdata;
675
assert(b); /* Spurious warning */
1488
static void browse_callback(AvahiSServiceBrowser *b,
1489
AvahiIfIndex interface,
1490
AvahiProtocol protocol,
1491
AvahiBrowserEvent event,
1492
const char *name,
1493
const char *type,
1494
const char *domain,
1495
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1496
flags,
1497
void *mc){
1498
if(b == NULL){
1499
return;
1500
}
676
1501
677
1502
/* Called whenever a new services becomes available on the LAN or
678
1503
is removed from the LAN */
679
1504
680
switch (event) {
1505
if(quit_now){
1506
return;
1507
}
1508
1509
switch(event){
681
1510
default:
682
1511
case AVAHI_BROWSER_FAILURE:
683
1512
684
fprintf(stderr, "(Avahi browser) %s\n",
685
avahi_strerror(avahi_server_errno(mc->server)));
686
avahi_simple_poll_quit(mc->simple_poll);
1513
fprintf_plus(stderr, "(Avahi browser) %s\n",
1514
avahi_strerror(avahi_server_errno
1515
(((mandos_context*)mc)->server)));
1516
avahi_simple_poll_quit(simple_poll);
687
1517
return;
688
1518
689
1519
case AVAHI_BROWSER_NEW:
692
1522
the callback function is called the Avahi server will free the
693
1523
resolver for us. */
694
1524
695
if (!(avahi_s_service_resolver_new(mc->server, interface,
696
protocol, name, type, domain,
697
AVAHI_PROTO_INET6, 0,
698
resolve_callback, mc)))
699
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
700
name, avahi_strerror(avahi_server_errno(mc->server)));
1525
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1526
interface, protocol, name, type,
1527
domain, protocol, 0,
1528
resolve_callback, mc) == NULL)
1529
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1530
" %s\n", name,
1531
avahi_strerror(avahi_server_errno
1532
(((mandos_context*)mc)->server)));
701
1533
break;
702
1534
703
1535
case AVAHI_BROWSER_REMOVE:
706
1538
case AVAHI_BROWSER_ALL_FOR_NOW:
707
1539
case AVAHI_BROWSER_CACHE_EXHAUSTED:
708
1540
if(debug){
709
fprintf(stderr, "No Mandos server found, still searching...\n");
1541
fprintf_plus(stderr, "No Mandos server found, still"
1542
" searching...\n");
710
1543
}
711
1544
break;
712
1545
}
713
1546
}
714
1547
715
/* Combines file name and path and returns the malloced new
716
string. some sane checks could/should be added */
717
static const char *combinepath(const char *first, const char *second){
718
size_t f_len = strlen(first);
719
size_t s_len = strlen(second);
720
char *tmp = malloc(f_len + s_len + 2);
721
if (tmp == NULL){
722
return NULL;
723
}
724
if(f_len > 0){
725
memcpy(tmp, first, f_len); /* Spurious warning */
726
}
727
tmp[f_len] = '/';
728
if(s_len > 0){
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
730
}
731
tmp[f_len + 1 + s_len] = '\0';
732
return tmp;
733
}
734
1548
/* Signal handler that stops main loop after SIGTERM */
1549
static void handle_sigterm(int sig){
1550
if(quit_now){
1551
return;
1552
}
1553
quit_now = 1;
1554
signal_received = sig;
1555
int old_errno = errno;
1556
/* set main loop to exit */
1557
if(simple_poll != NULL){
1558
avahi_simple_poll_quit(simple_poll);
1559
}
1560
errno = old_errno;
1561
}
1562
1563
__attribute__((nonnull, warn_unused_result))
1564
bool get_flags(const char *ifname, struct ifreq *ifr){
1565
int ret;
1566
error_t ret_errno;
1567
1568
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1569
if(s < 0){
1570
ret_errno = errno;
1571
perror_plus("socket");
1572
errno = ret_errno;
1573
return false;
1574
}
1575
strcpy(ifr->ifr_name, ifname);
1576
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1577
if(ret == -1){
1578
if(debug){
1579
ret_errno = errno;
1580
perror_plus("ioctl SIOCGIFFLAGS");
1581
errno = ret_errno;
1582
}
1583
return false;
1584
}
1585
return true;
1586
}
1587
1588
__attribute__((nonnull, warn_unused_result))
1589
bool good_flags(const char *ifname, const struct ifreq *ifr){
1590
1591
/* Reject the loopback device */
1592
if(ifr->ifr_flags & IFF_LOOPBACK){
1593
if(debug){
1594
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1595
ifname);
1596
}
1597
return false;
1598
}
1599
/* Accept point-to-point devices only if connect_to is specified */
1600
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1601
if(debug){
1602
fprintf_plus(stderr, "Accepting point-to-point interface"
1603
" \"%s\"\n", ifname);
1604
}
1605
return true;
1606
}
1607
/* Otherwise, reject non-broadcast-capable devices */
1608
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1609
if(debug){
1610
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1611
" \"%s\"\n", ifname);
1612
}
1613
return false;
1614
}
1615
/* Reject non-ARP interfaces (including dummy interfaces) */
1616
if(ifr->ifr_flags & IFF_NOARP){
1617
if(debug){
1618
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1619
ifname);
1620
}
1621
return false;
1622
}
1623
1624
/* Accept this device */
1625
if(debug){
1626
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1627
}
1628
return true;
1629
}
1630
1631
/*
1632
* This function determines if a directory entry in /sys/class/net
1633
* corresponds to an acceptable network device.
1634
* (This function is passed to scandir(3) as a filter function.)
1635
*/
1636
__attribute__((nonnull, warn_unused_result))
1637
int good_interface(const struct dirent *if_entry){
1638
if(if_entry->d_name[0] == '.'){
1639
return 0;
1640
}
1641
1642
struct ifreq ifr;
1643
if(not get_flags(if_entry->d_name, &ifr)){
1644
if(debug){
1645
fprintf_plus(stderr, "Failed to get flags for interface "
1646
"\"%s\"\n", if_entry->d_name);
1647
}
1648
return 0;
1649
}
1650
1651
if(not good_flags(if_entry->d_name, &ifr)){
1652
return 0;
1653
}
1654
return 1;
1655
}
1656
1657
/*
1658
* This function determines if a network interface is up.
1659
*/
1660
__attribute__((nonnull, warn_unused_result))
1661
bool interface_is_up(const char *interface){
1662
struct ifreq ifr;
1663
if(not get_flags(interface, &ifr)){
1664
if(debug){
1665
fprintf_plus(stderr, "Failed to get flags for interface "
1666
"\"%s\"\n", interface);
1667
}
1668
return false;
1669
}
1670
1671
return (bool)(ifr.ifr_flags & IFF_UP);
1672
}
1673
1674
/*
1675
* This function determines if a network interface is running
1676
*/
1677
__attribute__((nonnull, warn_unused_result))
1678
bool interface_is_running(const char *interface){
1679
struct ifreq ifr;
1680
if(not get_flags(interface, &ifr)){
1681
if(debug){
1682
fprintf_plus(stderr, "Failed to get flags for interface "
1683
"\"%s\"\n", interface);
1684
}
1685
return false;
1686
}
1687
1688
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1689
}
1690
1691
__attribute__((nonnull, pure, warn_unused_result))
1692
int notdotentries(const struct dirent *direntry){
1693
/* Skip "." and ".." */
1694
if(direntry->d_name[0] == '.'
1695
and (direntry->d_name[1] == '\0'
1696
or (direntry->d_name[1] == '.'
1697
and direntry->d_name[2] == '\0'))){
1698
return 0;
1699
}
1700
return 1;
1701
}
1702
1703
/* Is this directory entry a runnable program? */
1704
__attribute__((nonnull, warn_unused_result))
1705
int runnable_hook(const struct dirent *direntry){
1706
int ret;
1707
size_t sret;
1708
struct stat st;
1709
1710
if((direntry->d_name)[0] == '\0'){
1711
/* Empty name? */
1712
return 0;
1713
}
1714
1715
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1716
"abcdefghijklmnopqrstuvwxyz"
1717
"0123456789"
1718
"_.-");
1719
if((direntry->d_name)[sret] != '\0'){
1720
/* Contains non-allowed characters */
1721
if(debug){
1722
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1723
direntry->d_name);
1724
}
1725
return 0;
1726
}
1727
1728
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1729
if(ret == -1){
1730
if(debug){
1731
perror_plus("Could not stat hook");
1732
}
1733
return 0;
1734
}
1735
if(not (S_ISREG(st.st_mode))){
1736
/* Not a regular file */
1737
if(debug){
1738
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1739
direntry->d_name);
1740
}
1741
return 0;
1742
}
1743
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1744
/* Not executable */
1745
if(debug){
1746
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1747
direntry->d_name);
1748
}
1749
return 0;
1750
}
1751
if(debug){
1752
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1753
direntry->d_name);
1754
}
1755
return 1;
1756
}
1757
1758
__attribute__((nonnull, warn_unused_result))
1759
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1760
mandos_context *mc){
1761
int ret;
1762
struct timespec now;
1763
struct timespec waited_time;
1764
intmax_t block_time;
1765
1766
while(true){
1767
if(mc->current_server == NULL){
1768
if(debug){
1769
fprintf_plus(stderr, "Wait until first server is found."
1770
" No timeout!\n");
1771
}
1772
ret = avahi_simple_poll_iterate(s, -1);
1773
} else {
1774
if(debug){
1775
fprintf_plus(stderr, "Check current_server if we should run"
1776
" it, or wait\n");
1777
}
1778
/* the current time */
1779
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1780
if(ret == -1){
1781
perror_plus("clock_gettime");
1782
return -1;
1783
}
1784
/* Calculating in ms how long time between now and server
1785
who we visted longest time ago. Now - last seen. */
1786
waited_time.tv_sec = (now.tv_sec
1787
- mc->current_server->last_seen.tv_sec);
1788
waited_time.tv_nsec = (now.tv_nsec
1789
- mc->current_server->last_seen.tv_nsec);
1790
/* total time is 10s/10,000ms.
1791
Converting to s from ms by dividing by 1,000,
1792
and ns to ms by dividing by 1,000,000. */
1793
block_time = ((retry_interval
1794
- ((intmax_t)waited_time.tv_sec * 1000))
1795
- ((intmax_t)waited_time.tv_nsec / 1000000));
1796
1797
if(debug){
1798
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1799
block_time);
1800
}
1801
1802
if(block_time <= 0){
1803
ret = start_mandos_communication(mc->current_server->ip,
1804
mc->current_server->port,
1805
mc->current_server->if_index,
1806
mc->current_server->af, mc);
1807
if(ret == 0){
1808
avahi_simple_poll_quit(s);
1809
return 0;
1810
}
1811
ret = clock_gettime(CLOCK_MONOTONIC,
1812
&mc->current_server->last_seen);
1813
if(ret == -1){
1814
perror_plus("clock_gettime");
1815
return -1;
1816
}
1817
mc->current_server = mc->current_server->next;
1818
block_time = 0; /* Call avahi to find new Mandos
1819
servers, but don't block */
1820
}
1821
1822
ret = avahi_simple_poll_iterate(s, (int)block_time);
1823
}
1824
if(ret != 0){
1825
if(ret > 0 or errno != EINTR){
1826
return (ret != 1) ? ret : 0;
1827
}
1828
}
1829
}
1830
}
1831
1832
__attribute__((nonnull))
1833
void run_network_hooks(const char *mode, const char *interface,
1834
const float delay){
1835
struct dirent **direntries = NULL;
1836
if(hookdir_fd == -1){
1837
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1838
| O_CLOEXEC);
1839
if(hookdir_fd == -1){
1840
if(errno == ENOENT){
1841
if(debug){
1842
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1843
" found\n", hookdir);
1844
}
1845
} else {
1846
perror_plus("open");
1847
}
1848
return;
1849
}
1850
}
1851
#ifdef __GLIBC__
1852
#if __GLIBC_PREREQ(2, 15)
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1857
alphasort);
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1861
alphasort);
1862
#endif /* not __GLIBC__ */
1863
if(numhooks == -1){
1864
perror_plus("scandir");
1865
return;
1866
}
1867
struct dirent *direntry;
1868
int ret;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1870
if(devnull == -1){
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1872
return;
1873
}
1874
for(int i = 0; i < numhooks; i++){
1875
direntry = direntries[i];
1876
if(debug){
1877
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1878
direntry->d_name);
1879
}
1880
pid_t hook_pid = fork();
1881
if(hook_pid == 0){
1882
/* Child */
1883
/* Raise privileges */
1884
errno = raise_privileges_permanently();
1885
if(errno != 0){
1886
perror_plus("Failed to raise privileges");
1887
_exit(EX_NOPERM);
1888
}
1889
/* Set group */
1890
errno = 0;
1891
ret = setgid(0);
1892
if(ret == -1){
1893
perror_plus("setgid");
1894
_exit(EX_NOPERM);
1895
}
1896
/* Reset supplementary groups */
1897
errno = 0;
1898
ret = setgroups(0, NULL);
1899
if(ret == -1){
1900
perror_plus("setgroups");
1901
_exit(EX_NOPERM);
1902
}
1903
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1904
if(ret == -1){
1905
perror_plus("setenv");
1906
_exit(EX_OSERR);
1907
}
1908
ret = setenv("DEVICE", interface, 1);
1909
if(ret == -1){
1910
perror_plus("setenv");
1911
_exit(EX_OSERR);
1912
}
1913
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1914
if(ret == -1){
1915
perror_plus("setenv");
1916
_exit(EX_OSERR);
1917
}
1918
ret = setenv("MODE", mode, 1);
1919
if(ret == -1){
1920
perror_plus("setenv");
1921
_exit(EX_OSERR);
1922
}
1923
char *delaystring;
1924
ret = asprintf(&delaystring, "%f", (double)delay);
1925
if(ret == -1){
1926
perror_plus("asprintf");
1927
_exit(EX_OSERR);
1928
}
1929
ret = setenv("DELAY", delaystring, 1);
1930
if(ret == -1){
1931
free(delaystring);
1932
perror_plus("setenv");
1933
_exit(EX_OSERR);
1934
}
1935
free(delaystring);
1936
if(connect_to != NULL){
1937
ret = setenv("CONNECT", connect_to, 1);
1938
if(ret == -1){
1939
perror_plus("setenv");
1940
_exit(EX_OSERR);
1941
}
1942
}
1943
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1944
direntry->d_name,
1945
O_RDONLY));
1946
if(hook_fd == -1){
1947
perror_plus("openat");
1948
_exit(EXIT_FAILURE);
1949
}
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1951
perror_plus("close");
1952
_exit(EXIT_FAILURE);
1953
}
1954
ret = dup2(devnull, STDIN_FILENO);
1955
if(ret == -1){
1956
perror_plus("dup2(devnull, STDIN_FILENO)");
1957
_exit(EX_OSERR);
1958
}
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1960
if(ret == -1){
1961
perror_plus("close");
1962
_exit(EX_OSERR);
1963
}
1964
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1965
if(ret == -1){
1966
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1967
_exit(EX_OSERR);
1968
}
1969
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1970
environ) == -1){
1971
perror_plus("fexecve");
1972
_exit(EXIT_FAILURE);
1973
}
1974
} else {
1975
if(hook_pid == -1){
1976
perror_plus("fork");
1977
free(direntry);
1978
continue;
1979
}
1980
int status;
1981
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1982
perror_plus("waitpid");
1983
free(direntry);
1984
continue;
1985
}
1986
if(WIFEXITED(status)){
1987
if(WEXITSTATUS(status) != 0){
1988
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1989
" with status %d\n", direntry->d_name,
1990
WEXITSTATUS(status));
1991
free(direntry);
1992
continue;
1993
}
1994
} else if(WIFSIGNALED(status)){
1995
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1996
" signal %d\n", direntry->d_name,
1997
WTERMSIG(status));
1998
free(direntry);
1999
continue;
2000
} else {
2001
fprintf_plus(stderr, "Warning: network hook \"%s\""
2002
" crashed\n", direntry->d_name);
2003
free(direntry);
2004
continue;
2005
}
2006
}
2007
if(debug){
2008
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2009
direntry->d_name);
2010
}
2011
free(direntry);
2012
}
2013
free(direntries);
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
perror_plus("close");
2016
} else {
2017
hookdir_fd = -1;
2018
}
2019
close(devnull);
2020
}
2021
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t bring_up_interface(const char *const interface,
2024
const float delay){
2025
error_t old_errno = errno;
2026
int ret;
2027
struct ifreq network;
2028
unsigned int if_index = if_nametoindex(interface);
2029
if(if_index == 0){
2030
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2031
errno = old_errno;
2032
return ENXIO;
2033
}
2034
2035
if(quit_now){
2036
errno = old_errno;
2037
return EINTR;
2038
}
2039
2040
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network)){
2043
ret_errno = errno;
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2046
errno = old_errno;
2047
return ret_errno;
2048
}
2049
network.ifr_flags |= IFF_UP; /* set flag */
2050
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2052
if(sd == -1){
2053
ret_errno = errno;
2054
perror_plus("socket");
2055
errno = old_errno;
2056
return ret_errno;
2057
}
2058
2059
if(quit_now){
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2061
if(ret == -1){
2062
perror_plus("close");
2063
}
2064
errno = old_errno;
2065
return EINTR;
2066
}
2067
2068
if(debug){
2069
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2070
interface);
2071
}
2072
2073
/* Raise privileges */
2074
ret_errno = raise_privileges();
2075
if(ret_errno != 0){
2076
errno = ret_errno;
2077
perror_plus("Failed to raise privileges");
2078
}
2079
2080
#ifdef __linux__
2081
int ret_linux;
2082
bool restore_loglevel = false;
2083
if(ret_errno == 0){
2084
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2085
messages about the network interface to mess up the prompt */
2086
ret_linux = klogctl(8, NULL, 5);
2087
if(ret_linux == -1){
2088
perror_plus("klogctl");
2089
} else {
2090
restore_loglevel = true;
2091
}
2092
}
2093
#endif /* __linux__ */
2094
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2095
ioctl_errno = errno;
2096
#ifdef __linux__
2097
if(restore_loglevel){
2098
ret_linux = klogctl(7, NULL, 0);
2099
if(ret_linux == -1){
2100
perror_plus("klogctl");
2101
}
2102
}
2103
#endif /* __linux__ */
2104
2105
/* If raise_privileges() succeeded above */
2106
if(ret_errno == 0){
2107
/* Lower privileges */
2108
ret_errno = lower_privileges();
2109
if(ret_errno != 0){
2110
errno = ret_errno;
2111
perror_plus("Failed to lower privileges");
2112
}
2113
}
2114
2115
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2117
if(ret == -1){
2118
perror_plus("close");
2119
}
2120
2121
if(ret_setflags == -1){
2122
errno = ioctl_errno;
2123
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2124
errno = old_errno;
2125
return ioctl_errno;
2126
}
2127
} else if(debug){
2128
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2129
interface);
2130
}
2131
2132
/* Sleep checking until interface is running.
2133
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2135
if(interface_is_running(interface)){
2136
break;
2137
}
2138
struct timespec sleeptime = { .tv_nsec = 250000000 };
2139
ret = nanosleep(&sleeptime, NULL);
2140
if(ret == -1 and errno != EINTR){
2141
perror_plus("nanosleep");
2142
}
2143
}
2144
2145
errno = old_errno;
2146
return 0;
2147
}
2148
2149
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2152
struct ifreq network;
2153
unsigned int if_index = if_nametoindex(interface);
2154
if(if_index == 0){
2155
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2156
errno = old_errno;
2157
return ENXIO;
2158
}
2159
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2161
if(not get_flags(interface, &network) and debug){
2162
ret_errno = errno;
2163
fprintf_plus(stderr, "Failed to get flags for interface "
2164
"\"%s\"\n", interface);
2165
errno = old_errno;
2166
return ret_errno;
2167
}
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
2170
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2171
if(sd == -1){
2172
ret_errno = errno;
2173
perror_plus("socket");
2174
errno = old_errno;
2175
return ret_errno;
2176
}
2177
2178
if(debug){
2179
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2180
interface);
2181
}
2182
2183
/* Raise privileges */
2184
ret_errno = raise_privileges();
2185
if(ret_errno != 0){
2186
errno = ret_errno;
2187
perror_plus("Failed to raise privileges");
2188
}
2189
2190
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2191
ioctl_errno = errno;
2192
2193
/* If raise_privileges() succeeded above */
2194
if(ret_errno == 0){
2195
/* Lower privileges */
2196
ret_errno = lower_privileges();
2197
if(ret_errno != 0){
2198
errno = ret_errno;
2199
perror_plus("Failed to lower privileges");
2200
}
2201
}
2202
2203
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2205
if(ret == -1){
2206
perror_plus("close");
2207
}
2208
2209
if(ret_setflags == -1){
2210
errno = ioctl_errno;
2211
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2212
errno = old_errno;
2213
return ioctl_errno;
2214
}
2215
} else if(debug){
2216
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2217
interface);
2218
}
2219
2220
errno = old_errno;
2221
return 0;
2222
}
735
2223
736
2224
int main(int argc, char *argv[]){
737
AvahiSServiceBrowser *sb = NULL;
738
int error;
739
int ret;
740
int exitcode = EXIT_SUCCESS;
741
const char *interface = "eth0";
742
struct ifreq network;
743
int sd;
744
uid_t uid;
745
gid_t gid;
746
char *connect_to = NULL;
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
748
const char *pubkeyfile = "pubkey.txt";
749
const char *seckeyfile = "seckey.txt";
750
mandos_context mc = { .simple_poll = NULL, .server = NULL,
751
.dh_bits = 1024, .priority = "SECURE256"};
752
bool gnutls_initalized = false;
753
754
{
755
struct argp_option options[] = {
756
{ .name = "debug", .key = 128,
757
.doc = "Debug mode", .group = 3 },
758
{ .name = "connect", .key = 'c',
759
.arg = "IP",
760
.doc = "Connect directly to a sepcified mandos server",
761
.group = 1 },
762
{ .name = "interface", .key = 'i',
763
.arg = "INTERFACE",
764
.doc = "Interface that Avahi will conntect through",
765
.group = 1 },
766
{ .name = "keydir", .key = 'd',
767
.arg = "KEYDIR",
768
.doc = "Directory where the openpgp keyring is",
769
.group = 1 },
770
{ .name = "seckey", .key = 's',
771
.arg = "SECKEY",
772
.doc = "Secret openpgp key for gnutls authentication",
773
.group = 1 },
774
{ .name = "pubkey", .key = 'p',
775
.arg = "PUBKEY",
776
.doc = "Public openpgp key for gnutls authentication",
777
.group = 2 },
778
{ .name = "dh-bits", .key = 129,
779
.arg = "BITS",
780
.doc = "dh-bits to use in gnutls communication",
781
.group = 2 },
782
{ .name = "priority", .key = 130,
783
.arg = "PRIORITY",
784
.doc = "GNUTLS priority", .group = 1 },
785
{ .name = NULL }
786
};
787
788
789
error_t parse_opt (int key, char *arg,
790
struct argp_state *state) {
791
/* Get the INPUT argument from `argp_parse', which we know is
792
a pointer to our plugin list pointer. */
793
switch (key) {
794
case 128:
795
debug = true;
796
break;
797
case 'c':
798
connect_to = arg;
799
break;
800
case 'i':
801
interface = arg;
802
break;
803
case 'd':
804
keydir = arg;
805
break;
806
case 's':
807
seckeyfile = arg;
808
break;
809
case 'p':
810
pubkeyfile = arg;
811
break;
812
case 129:
813
errno = 0;
814
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
815
if (errno){
816
perror("strtol");
817
exit(EXIT_FAILURE);
818
}
819
break;
820
case 130:
821
mc.priority = arg;
822
break;
823
case ARGP_KEY_ARG:
824
argp_usage (state);
825
break;
826
case ARGP_KEY_END:
827
break;
828
default:
829
return ARGP_ERR_UNKNOWN;
830
}
831
return 0;
832
}
833
834
struct argp argp = { .options = options, .parser = parse_opt,
835
.args_doc = "",
836
.doc = "Mandos client -- Get and decrypt"
837
" passwords from mandos server" };
838
argp_parse (&argp, argc, argv, 0, 0, NULL);
839
}
840
841
pubkeyfile = combinepath(keydir, pubkeyfile);
842
if (pubkeyfile == NULL){
843
perror("combinepath");
2225
mandos_context mc = { .server = NULL, .dh_bits = 0,
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
2229
AvahiSServiceBrowser *sb = NULL;
2230
error_t ret_errno;
2231
int ret;
2232
intmax_t tmpmax;
2233
char *tmp;
2234
int exitcode = EXIT_SUCCESS;
2235
char *interfaces_to_take_down = NULL;
2236
size_t interfaces_to_take_down_size = 0;
2237
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2238
char old_tempdir[] = "/tmp/mandosXXXXXX";
2239
char *tempdir = NULL;
2240
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
const char *seckey = PATHDIR "/" SECKEY;
2242
const char *pubkey = PATHDIR "/" PUBKEY;
2243
char *interfaces_hooks = NULL;
2244
2245
bool gnutls_initialized = false;
2246
bool gpgme_initialized = false;
2247
float delay = 2.5f;
2248
double retry_interval = 10; /* 10s between trying a server and
2249
retrying the same server again */
2250
2251
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2252
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2253
2254
uid = getuid();
2255
gid = getgid();
2256
2257
/* Lower any group privileges we might have, just to be safe */
2258
errno = 0;
2259
ret = setgid(gid);
2260
if(ret == -1){
2261
perror_plus("setgid");
2262
}
2263
2264
/* Lower user privileges (temporarily) */
2265
errno = 0;
2266
ret = seteuid(uid);
2267
if(ret == -1){
2268
perror_plus("seteuid");
2269
}
2270
2271
if(quit_now){
2272
goto end;
2273
}
2274
2275
{
2276
struct argp_option options[] = {
2277
{ .name = "debug", .key = 128,
2278
.doc = "Debug mode", .group = 3 },
2279
{ .name = "connect", .key = 'c',
2280
.arg = "ADDRESS:PORT",
2281
.doc = "Connect directly to a specific Mandos server",
2282
.group = 1 },
2283
{ .name = "interface", .key = 'i',
2284
.arg = "NAME",
2285
.doc = "Network interface that will be used to search for"
2286
" Mandos servers",
2287
.group = 1 },
2288
{ .name = "seckey", .key = 's',
2289
.arg = "FILE",
2290
.doc = "OpenPGP secret key file base name",
2291
.group = 1 },
2292
{ .name = "pubkey", .key = 'p',
2293
.arg = "FILE",
2294
.doc = "OpenPGP public key file base name",
2295
.group = 2 },
2296
{ .name = "dh-bits", .key = 129,
2297
.arg = "BITS",
2298
.doc = "Bit length of the prime number used in the"
2299
" Diffie-Hellman key exchange",
2300
.group = 2 },
2301
{ .name = "priority", .key = 130,
2302
.arg = "STRING",
2303
.doc = "GnuTLS priority string for the TLS handshake",
2304
.group = 1 },
2305
{ .name = "delay", .key = 131,
2306
.arg = "SECONDS",
2307
.doc = "Maximum delay to wait for interface startup",
2308
.group = 2 },
2309
{ .name = "retry", .key = 132,
2310
.arg = "SECONDS",
2311
.doc = "Retry interval used when denied by the Mandos server",
2312
.group = 2 },
2313
{ .name = "network-hook-dir", .key = 133,
2314
.arg = "DIR",
2315
.doc = "Directory where network hooks are located",
2316
.group = 2 },
2317
/*
2318
* These reproduce what we would get without ARGP_NO_HELP
2319
*/
2320
{ .name = "help", .key = '?',
2321
.doc = "Give this help list", .group = -1 },
2322
{ .name = "usage", .key = -3,
2323
.doc = "Give a short usage message", .group = -1 },
2324
{ .name = "version", .key = 'V',
2325
.doc = "Print program version", .group = -1 },
2326
{ .name = NULL }
2327
};
2328
2329
error_t parse_opt(int key, char *arg,
2330
struct argp_state *state){
2331
errno = 0;
2332
switch(key){
2333
case 128: /* --debug */
2334
debug = true;
2335
break;
2336
case 'c': /* --connect */
2337
connect_to = arg;
2338
break;
2339
case 'i': /* --interface */
2340
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2341
arg, (int)',');
2342
if(ret_errno != 0){
2343
argp_error(state, "%s", strerror(ret_errno));
2344
}
2345
break;
2346
case 's': /* --seckey */
2347
seckey = arg;
2348
break;
2349
case 'p': /* --pubkey */
2350
pubkey = arg;
2351
break;
2352
case 129: /* --dh-bits */
2353
errno = 0;
2354
tmpmax = strtoimax(arg, &tmp, 10);
2355
if(errno != 0 or tmp == arg or *tmp != '\0'
2356
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2357
argp_error(state, "Bad number of DH bits");
2358
}
2359
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2360
break;
2361
case 130: /* --priority */
2362
mc.priority = arg;
2363
break;
2364
case 131: /* --delay */
2365
errno = 0;
2366
delay = strtof(arg, &tmp);
2367
if(errno != 0 or tmp == arg or *tmp != '\0'){
2368
argp_error(state, "Bad delay");
2369
}
2370
case 132: /* --retry */
2371
errno = 0;
2372
retry_interval = strtod(arg, &tmp);
2373
if(errno != 0 or tmp == arg or *tmp != '\0'
2374
or (retry_interval * 1000) > INT_MAX
2375
or retry_interval < 0){
2376
argp_error(state, "Bad retry interval");
2377
}
2378
break;
2379
case 133: /* --network-hook-dir */
2380
hookdir = arg;
2381
break;
2382
/*
2383
* These reproduce what we would get without ARGP_NO_HELP
2384
*/
2385
case '?': /* --help */
2386
argp_state_help(state, state->out_stream,
2387
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2388
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2389
case -3: /* --usage */
2390
argp_state_help(state, state->out_stream,
2391
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2392
case 'V': /* --version */
2393
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2394
exit(argp_err_exit_status);
2395
break;
2396
default:
2397
return ARGP_ERR_UNKNOWN;
2398
}
2399
return errno;
2400
}
2401
2402
struct argp argp = { .options = options, .parser = parse_opt,
2403
.args_doc = "",
2404
.doc = "Mandos client -- Get and decrypt"
2405
" passwords from a Mandos server" };
2406
ret = argp_parse(&argp, argc, argv,
2407
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2408
switch(ret){
2409
case 0:
2410
break;
2411
case ENOMEM:
2412
default:
2413
errno = ret;
2414
perror_plus("argp_parse");
2415
exitcode = EX_OSERR;
2416
goto end;
2417
case EINVAL:
2418
exitcode = EX_USAGE;
2419
goto end;
2420
}
2421
}
2422
2423
{
2424
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
2426
2427
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2431
perror_plus("Failed to raise privileges");
2432
} else {
2433
struct stat st;
2434
2435
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2436
int seckey_fd = open(seckey, O_RDONLY);
2437
if(seckey_fd == -1){
2438
perror_plus("open");
2439
} else {
2440
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2441
if(ret == -1){
2442
perror_plus("fstat");
2443
} else {
2444
if(S_ISREG(st.st_mode)
2445
and st.st_uid == 0 and st.st_gid == 0){
2446
ret = fchown(seckey_fd, uid, gid);
2447
if(ret == -1){
2448
perror_plus("fchown");
2449
}
2450
}
2451
}
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2453
}
2454
}
2455
2456
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2457
int pubkey_fd = open(pubkey, O_RDONLY);
2458
if(pubkey_fd == -1){
2459
perror_plus("open");
2460
} else {
2461
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2462
if(ret == -1){
2463
perror_plus("fstat");
2464
} else {
2465
if(S_ISREG(st.st_mode)
2466
and st.st_uid == 0 and st.st_gid == 0){
2467
ret = fchown(pubkey_fd, uid, gid);
2468
if(ret == -1){
2469
perror_plus("fchown");
2470
}
2471
}
2472
}
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2474
}
2475
}
2476
2477
/* Lower privileges */
2478
ret_errno = lower_privileges();
2479
if(ret_errno != 0){
2480
errno = ret_errno;
2481
perror_plus("Failed to lower privileges");
2482
}
2483
}
2484
}
2485
2486
/* Remove invalid interface names (except "none") */
2487
{
2488
char *interface = NULL;
2489
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2490
interface))){
2491
if(strcmp(interface, "none") != 0
2492
and if_nametoindex(interface) == 0){
2493
if(interface[0] != '\0'){
2494
fprintf_plus(stderr, "Not using nonexisting interface"
2495
" \"%s\"\n", interface);
2496
}
2497
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2498
interface = NULL;
2499
}
2500
}
2501
}
2502
2503
/* Run network hooks */
2504
{
2505
if(mc.interfaces != NULL){
2506
interfaces_hooks = malloc(mc.interfaces_size);
2507
if(interfaces_hooks == NULL){
2508
perror_plus("malloc");
2509
goto end;
2510
}
2511
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2512
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2513
}
2514
run_network_hooks("start", interfaces_hooks != NULL ?
2515
interfaces_hooks : "", delay);
2516
}
2517
2518
if(not debug){
2519
avahi_set_log_function(empty_log);
2520
}
2521
2522
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2523
from the signal handler */
2524
/* Initialize the pseudo-RNG for Avahi */
2525
srand((unsigned int) time(NULL));
2526
simple_poll = avahi_simple_poll_new();
2527
if(simple_poll == NULL){
2528
fprintf_plus(stderr,
2529
"Avahi: Failed to create simple poll object.\n");
2530
exitcode = EX_UNAVAILABLE;
2531
goto end;
2532
}
2533
2534
sigemptyset(&sigterm_action.sa_mask);
2535
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2536
if(ret == -1){
2537
perror_plus("sigaddset");
2538
exitcode = EX_OSERR;
2539
goto end;
2540
}
2541
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2542
if(ret == -1){
2543
perror_plus("sigaddset");
2544
exitcode = EX_OSERR;
2545
goto end;
2546
}
2547
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2548
if(ret == -1){
2549
perror_plus("sigaddset");
2550
exitcode = EX_OSERR;
2551
goto end;
2552
}
2553
/* Need to check if the handler is SIG_IGN before handling:
2554
| [[info:libc:Initial Signal Actions]] |
2555
| [[info:libc:Basic Signal Handling]] |
2556
*/
2557
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2558
if(ret == -1){
2559
perror_plus("sigaction");
2560
return EX_OSERR;
2561
}
2562
if(old_sigterm_action.sa_handler != SIG_IGN){
2563
ret = sigaction(SIGINT, &sigterm_action, NULL);
2564
if(ret == -1){
2565
perror_plus("sigaction");
2566
exitcode = EX_OSERR;
2567
goto end;
2568
}
2569
}
2570
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2571
if(ret == -1){
2572
perror_plus("sigaction");
2573
return EX_OSERR;
2574
}
2575
if(old_sigterm_action.sa_handler != SIG_IGN){
2576
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2577
if(ret == -1){
2578
perror_plus("sigaction");
2579
exitcode = EX_OSERR;
2580
goto end;
2581
}
2582
}
2583
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2584
if(ret == -1){
2585
perror_plus("sigaction");
2586
return EX_OSERR;
2587
}
2588
if(old_sigterm_action.sa_handler != SIG_IGN){
2589
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2590
if(ret == -1){
2591
perror_plus("sigaction");
2592
exitcode = EX_OSERR;
2593
goto end;
2594
}
2595
}
2596
2597
/* If no interfaces were specified, make a list */
2598
if(mc.interfaces == NULL){
2599
struct dirent **direntries = NULL;
2600
/* Look for any good interfaces */
2601
ret = scandir(sys_class_net, &direntries, good_interface,
2602
alphasort);
2603
if(ret >= 1){
2604
/* Add all found interfaces to interfaces list */
2605
for(int i = 0; i < ret; ++i){
2606
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2607
direntries[i]->d_name);
2608
if(ret_errno != 0){
2609
errno = ret_errno;
2610
perror_plus("argz_add");
2611
free(direntries[i]);
2612
continue;
2613
}
2614
if(debug){
2615
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2616
direntries[i]->d_name);
2617
}
2618
free(direntries[i]);
2619
}
2620
free(direntries);
2621
} else {
2622
if(ret == 0){
2623
free(direntries);
2624
}
2625
fprintf_plus(stderr, "Could not find a network interface\n");
844
2626
exitcode = EXIT_FAILURE;
845
2627
goto end;
846
2628
}
847
848
seckeyfile = combinepath(keydir, seckeyfile);
849
if (seckeyfile == NULL){
850
perror("combinepath");
851
goto end;
852
}
853
854
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
855
if (ret == -1){
856
fprintf(stderr, "init_gnutls_global\n");
857
goto end;
2629
}
2630
2631
/* Bring up interfaces which are down, and remove any "none"s */
2632
{
2633
char *interface = NULL;
2634
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2635
interface))){
2636
/* If interface name is "none", stop bringing up interfaces.
2637
Also remove all instances of "none" from the list */
2638
if(strcmp(interface, "none") == 0){
2639
argz_delete(&mc.interfaces, &mc.interfaces_size,
2640
interface);
2641
interface = NULL;
2642
while((interface = argz_next(mc.interfaces,
2643
mc.interfaces_size, interface))){
2644
if(strcmp(interface, "none") == 0){
2645
argz_delete(&mc.interfaces, &mc.interfaces_size,
2646
interface);
2647
interface = NULL;
2648
}
2649
}
2650
break;
2651
}
2652
bool interface_was_up = interface_is_up(interface);
2653
errno = bring_up_interface(interface, delay);
2654
if(not interface_was_up){
2655
if(errno != 0){
2656
perror_plus("Failed to bring up interface");
2657
} else {
2658
errno = argz_add(&interfaces_to_take_down,
2659
&interfaces_to_take_down_size,
2660
interface);
2661
if(errno != 0){
2662
perror_plus("argz_add");
2663
}
2664
}
2665
}
2666
}
2667
if(debug and (interfaces_to_take_down == NULL)){
2668
fprintf_plus(stderr, "No interfaces were brought up\n");
2669
}
2670
}
2671
2672
/* If we only got one interface, explicitly use only that one */
2673
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2674
if(debug){
2675
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2676
mc.interfaces);
2677
}
2678
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2679
}
2680
2681
if(quit_now){
2682
goto end;
2683
}
2684
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
2686
if(ret == -1){
2687
fprintf_plus(stderr, "init_gnutls_global failed\n");
2688
exitcode = EX_UNAVAILABLE;
2689
goto end;
2690
} else {
2691
gnutls_initialized = true;
2692
}
2693
2694
if(quit_now){
2695
goto end;
2696
}
2697
2698
/* Try /run/tmp before /tmp */
2699
tempdir = mkdtemp(run_tempdir);
2700
if(tempdir == NULL and errno == ENOENT){
2701
if(debug){
2702
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2703
run_tempdir, old_tempdir);
2704
}
2705
tempdir = mkdtemp(old_tempdir);
2706
}
2707
if(tempdir == NULL){
2708
perror_plus("mkdtemp");
2709
goto end;
2710
}
2711
2712
if(quit_now){
2713
goto end;
2714
}
2715
2716
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2717
fprintf_plus(stderr, "init_gpgme failed\n");
2718
exitcode = EX_UNAVAILABLE;
2719
goto end;
2720
} else {
2721
gpgme_initialized = true;
2722
}
2723
2724
if(quit_now){
2725
goto end;
2726
}
2727
2728
if(connect_to != NULL){
2729
/* Connect directly, do not use Zeroconf */
2730
/* (Mainly meant for debugging) */
2731
char *address = strrchr(connect_to, ':');
2732
2733
if(address == NULL){
2734
fprintf_plus(stderr, "No colon in address\n");
2735
exitcode = EX_USAGE;
2736
goto end;
2737
}
2738
2739
if(quit_now){
2740
goto end;
2741
}
2742
2743
in_port_t port;
2744
errno = 0;
2745
tmpmax = strtoimax(address+1, &tmp, 10);
2746
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2747
or tmpmax != (in_port_t)tmpmax){
2748
fprintf_plus(stderr, "Bad port number\n");
2749
exitcode = EX_USAGE;
2750
goto end;
2751
}
2752
2753
if(quit_now){
2754
goto end;
2755
}
2756
2757
port = (in_port_t)tmpmax;
2758
*address = '\0';
2759
/* Colon in address indicates IPv6 */
2760
int af;
2761
if(strchr(connect_to, ':') != NULL){
2762
af = AF_INET6;
2763
/* Accept [] around IPv6 address - see RFC 5952 */
2764
if(connect_to[0] == '[' and address[-1] == ']')
2765
{
2766
connect_to++;
2767
address[-1] = '\0';
2768
}
858
2769
} else {
859
gnutls_initalized = true;
860
}
861
862
uid = getuid();
863
gid = getgid();
864
865
ret = setuid(uid);
866
if (ret == -1){
867
perror("setuid");
868
}
869
870
setgid(gid);
871
if (ret == -1){
872
perror("setgid");
873
}
874
875
if_index = (AvahiIfIndex) if_nametoindex(interface);
876
if(if_index == 0){
877
fprintf(stderr, "No such interface: \"%s\"\n", interface);
878
exit(EXIT_FAILURE);
879
}
880
881
if(connect_to != NULL){
882
/* Connect directly, do not use Zeroconf */
883
/* (Mainly meant for debugging) */
884
char *address = strrchr(connect_to, ':');
885
if(address == NULL){
886
fprintf(stderr, "No colon in address\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
}
890
errno = 0;
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
892
if(errno){
893
perror("Bad port number");
894
exitcode = EXIT_FAILURE;
895
goto end;
896
}
897
*address = '\0';
898
address = connect_to;
899
ret = start_mandos_communication(address, port, if_index, &mc);
900
if(ret < 0){
901
exitcode = EXIT_FAILURE;
902
} else {
903
exitcode = EXIT_SUCCESS;
904
}
2770
af = AF_INET;
2771
}
2772
address = connect_to;
2773
2774
if(quit_now){
905
2775
goto end;
906
2776
}
907
2777
908
/* If the interface is down, bring it up */
909
{
910
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
911
if(sd < 0) {
912
perror("socket");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
strcpy(network.ifr_name, interface); /* Spurious warning */
917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
918
if(ret == -1){
919
perror("ioctl SIOCGIFFLAGS");
920
exitcode = EXIT_FAILURE;
921
goto end;
922
}
923
if((network.ifr_flags & IFF_UP) == 0){
924
network.ifr_flags |= IFF_UP;
925
ret = ioctl(sd, SIOCSIFFLAGS, &network);
926
if(ret == -1){
927
perror("ioctl SIOCSIFFLAGS");
928
exitcode = EXIT_FAILURE;
929
goto end;
930
}
931
}
932
close(sd);
933
}
934
935
if (not debug){
936
avahi_set_log_function(empty_log);
937
}
938
939
/* Initialize the pseudo-RNG for Avahi */
940
srand((unsigned int) time(NULL));
941
942
/* Allocate main Avahi loop object */
943
mc.simple_poll = avahi_simple_poll_new();
944
if (mc.simple_poll == NULL) {
945
fprintf(stderr, "Avahi: Failed to create simple poll"
946
" object.\n");
947
exitcode = EXIT_FAILURE;
948
goto end;
949
}
950
951
{
952
AvahiServerConfig config;
953
/* Do not publish any local Zeroconf records */
954
avahi_server_config_init(&config);
955
config.publish_hinfo = 0;
956
config.publish_addresses = 0;
957
config.publish_workstation = 0;
958
config.publish_domain = 0;
959
960
/* Allocate a new server */
961
mc.server = avahi_server_new(avahi_simple_poll_get
962
(mc.simple_poll), &config, NULL,
963
NULL, &error);
964
965
/* Free the Avahi configuration data */
966
avahi_server_config_free(&config);
967
}
968
969
/* Check if creating the Avahi server object succeeded */
970
if (mc.server == NULL) {
971
fprintf(stderr, "Failed to create Avahi server: %s\n",
972
avahi_strerror(error));
973
exitcode = EXIT_FAILURE;
974
goto end;
975
}
976
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
979
AVAHI_PROTO_INET6,
980
"_mandos._tcp", NULL, 0,
981
browse_callback, &mc);
982
if (sb == NULL) {
983
fprintf(stderr, "Failed to create service browser: %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
987
}
988
989
/* Run the main loop */
990
991
if (debug){
992
fprintf(stderr, "Starting Avahi loop search\n");
993
}
994
995
avahi_simple_poll_loop(mc.simple_poll);
996
2778
while(not quit_now){
2779
ret = start_mandos_communication(address, port, if_index, af,
2780
&mc);
2781
if(quit_now or ret == 0){
2782
break;
2783
}
2784
if(debug){
2785
fprintf_plus(stderr, "Retrying in %d seconds\n",
2786
(int)retry_interval);
2787
}
2788
sleep((unsigned int)retry_interval);
2789
}
2790
2791
if(not quit_now){
2792
exitcode = EXIT_SUCCESS;
2793
}
2794
2795
goto end;
2796
}
2797
2798
if(quit_now){
2799
goto end;
2800
}
2801
2802
{
2803
AvahiServerConfig config;
2804
/* Do not publish any local Zeroconf records */
2805
avahi_server_config_init(&config);
2806
config.publish_hinfo = 0;
2807
config.publish_addresses = 0;
2808
config.publish_workstation = 0;
2809
config.publish_domain = 0;
2810
2811
/* Allocate a new server */
2812
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
2814
2815
/* Free the Avahi configuration data */
2816
avahi_server_config_free(&config);
2817
}
2818
2819
/* Check if creating the Avahi server object succeeded */
2820
if(mc.server == NULL){
2821
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2822
avahi_strerror(ret_errno));
2823
exitcode = EX_UNAVAILABLE;
2824
goto end;
2825
}
2826
2827
if(quit_now){
2828
goto end;
2829
}
2830
2831
/* Create the Avahi service browser */
2832
sb = avahi_s_service_browser_new(mc.server, if_index,
2833
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2834
NULL, 0, browse_callback,
2835
(void *)&mc);
2836
if(sb == NULL){
2837
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2838
avahi_strerror(avahi_server_errno(mc.server)));
2839
exitcode = EX_UNAVAILABLE;
2840
goto end;
2841
}
2842
2843
if(quit_now){
2844
goto end;
2845
}
2846
2847
/* Run the main loop */
2848
2849
if(debug){
2850
fprintf_plus(stderr, "Starting Avahi loop search\n");
2851
}
2852
2853
ret = avahi_loop_with_timeout(simple_poll,
2854
(int)(retry_interval * 1000), &mc);
2855
if(debug){
2856
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2857
(ret == 0) ? "successfully" : "with error");
2858
}
2859
997
2860
end:
998
999
if (debug){
1000
fprintf(stderr, "%s exiting\n", argv[0]);
1001
}
1002
1003
/* Cleanup things */
1004
if (sb != NULL)
1005
avahi_s_service_browser_free(sb);
1006
1007
if (mc.server != NULL)
1008
avahi_server_free(mc.server);
1009
1010
if (mc.simple_poll != NULL)
1011
avahi_simple_poll_free(mc.simple_poll);
1012
free(pubkeyfile);
1013
free(seckeyfile);
1014
1015
if (gnutls_initalized){
1016
gnutls_certificate_free_credentials (mc.cred);
1017
gnutls_global_deinit ();
1018
}
1019
1020
return exitcode;
2861
2862
if(debug){
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2864
}
2865
2866
/* Cleanup things */
2867
free(mc.interfaces);
2868
2869
if(sb != NULL)
2870
avahi_s_service_browser_free(sb);
2871
2872
if(mc.server != NULL)
2873
avahi_server_free(mc.server);
2874
2875
if(simple_poll != NULL)
2876
avahi_simple_poll_free(simple_poll);
2877
2878
if(gnutls_initialized){
2879
gnutls_certificate_free_credentials(mc.cred);
2880
gnutls_global_deinit();
2881
gnutls_dh_params_deinit(mc.dh_params);
2882
}
2883
2884
if(gpgme_initialized){
2885
gpgme_release(mc.ctx);
2886
}
2887
2888
/* Cleans up the circular linked list of Mandos servers the client
2889
has seen */
2890
if(mc.current_server != NULL){
2891
mc.current_server->prev->next = NULL;
2892
while(mc.current_server != NULL){
2893
server *next = mc.current_server->next;
2894
#ifdef __GNUC__
2895
#pragma GCC diagnostic push
2896
#pragma GCC diagnostic ignored "-Wcast-qual"
2897
#endif
2898
free((char *)(mc.current_server->ip));
2899
#ifdef __GNUC__
2900
#pragma GCC diagnostic pop
2901
#endif
2902
free(mc.current_server);
2903
mc.current_server = next;
2904
}
2905
}
2906
2907
/* Re-raise privileges */
2908
{
2909
ret_errno = raise_privileges();
2910
if(ret_errno != 0){
2911
errno = ret_errno;
2912
perror_plus("Failed to raise privileges");
2913
} else {
2914
2915
/* Run network hooks */
2916
run_network_hooks("stop", interfaces_hooks != NULL ?
2917
interfaces_hooks : "", delay);
2918
2919
/* Take down the network interfaces which were brought up */
2920
{
2921
char *interface = NULL;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2924
interface))){
2925
ret_errno = take_down_interface(interface);
2926
if(ret_errno != 0){
2927
errno = ret_errno;
2928
perror_plus("Failed to take down interface");
2929
}
2930
}
2931
if(debug and (interfaces_to_take_down == NULL)){
2932
fprintf_plus(stderr, "No interfaces needed to be taken"
2933
" down\n");
2934
}
2935
}
2936
}
2937
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
2941
perror_plus("Failed to lower privileges permanently");
2942
}
2943
}
2944
2945
free(interfaces_to_take_down);
2946
free(interfaces_hooks);
2947
2948
/* Removes the GPGME temp directory and all files inside */
2949
if(tempdir != NULL){
2950
struct dirent **direntries = NULL;
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2952
| O_NOFOLLOW
2953
| O_DIRECTORY
2954
| O_PATH));
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2957
} else {
2958
#ifdef __GLIBC__
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2964
alphasort);
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2968
alphasort);
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2973
if(ret == -1){
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2977
}
2978
free(direntries[i]);
2979
}
2980
2981
/* need to clean even if 0 because man page doesn't specify */
2982
free(direntries);
2983
if(numentries == -1){
2984
perror_plus("scandir");
2985
}
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
2989
}
2990
}
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
2992
}
2993
}
2994
2995
if(quit_now){
2996
sigemptyset(&old_sigterm_action.sa_mask);
2997
old_sigterm_action.sa_handler = SIG_DFL;
2998
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2999
&old_sigterm_action,
3000
NULL));
3001
if(ret == -1){
3002
perror_plus("sigaction");
3003
}
3004
do {
3005
ret = raise(signal_received);
3006
} while(ret != 0 and errno == EINTR);
3007
if(ret != 0){
3008
perror_plus("raise");
3009
abort();
3010
}
3011
TEMP_FAILURE_RETRY(pause());
3012
}
3013
3014
return exitcode;
1021
3015
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0