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- Committer: Teddy Hogeborn
- Date: 2009-02-09 02:01:13 UTC
- Revision ID: teddy@fukt.bsnet.se-20090209020113-726hq380zvp8zt97
Four new interrelated features:
1. Support using a different network interface via both initramfs.conf
(the DEVICE setting) and the kernel command line (sixth field of
the "ip=" option as in Linux' Documentation/nfsroot.txt).
2. Support connecting to a specified Mandos server directly using a
kernel command line option ("mandos=connect:<ADDRESS>:<PORT>").
3. Support connecting directly to an IPv4 address (and port) using the
"--connect" option of mandos-client.
4. Support an empty string to the --interface option to mandos-client.
* Makefile (WARN): Increase strictness by changing to
"-Wstrict-aliasing=1".
* debian/mandos-client.README.Debian (Use the Correct Network
Interface): Changed to refer to initramfs.conf and nfsroot.txt.
(Test the Server): Improve wording.
(Non-local Connection): New section.
* initramfs-tools-script: Obey DEVICE environment variable and setting
from "/conf/initramfs.conf". Also let any
"ip=" kernel command line option override
it. Support new "mandos=connect" option.
Call "configure_networking" to set up IP
address on interface if necessary.
* plugin-runner.conf: Change example.
* plugins.d/mandos-client.c: Some whitespace and comment changes.
(start_mandos_communication): Take an additional argument for
address family, all callers changed.
Connect to an IPv4 address if address
family is AF_INET. Only set IPv6
scope_id for link-local addresses.
(main): Accept empty interface name; this will not bring up any
interface and leave the interface as unspecified. Also do
not restore kernel log level if lowering it failed.
* plugins.d/mandos-client.xml (OPTIONS): Document that the
"--interface" option accepts
an empty string.
(EXAMPLE): Change example IPv6 address to a link-local address.
1. Support using a different network interface via both initramfs.conf
(the DEVICE setting) and the kernel command line (sixth field of
the "ip=" option as in Linux' Documentation/nfsroot.txt).
2. Support connecting to a specified Mandos server directly using a
kernel command line option ("mandos=connect:<ADDRESS>:<PORT>").
3. Support connecting directly to an IPv4 address (and port) using the
"--connect" option of mandos-client.
4. Support an empty string to the --interface option to mandos-client.
* Makefile (WARN): Increase strictness by changing to
"-Wstrict-aliasing=1".
* debian/mandos-client.README.Debian (Use the Correct Network
Interface): Changed to refer to initramfs.conf and nfsroot.txt.
(Test the Server): Improve wording.
(Non-local Connection): New section.
* initramfs-tools-script: Obey DEVICE environment variable and setting
from "/conf/initramfs.conf". Also let any
"ip=" kernel command line option override
it. Support new "mandos=connect" option.
Call "configure_networking" to set up IP
address on interface if necessary.
* plugin-runner.conf: Change example.
* plugins.d/mandos-client.c: Some whitespace and comment changes.
(start_mandos_communication): Take an additional argument for
address family, all callers changed.
Connect to an IPv4 address if address
family is AF_INET. Only set IPv6
scope_id for link-local addresses.
(main): Accept empty interface name; this will not bring up any
interface and leave the interface as unspecified. Also do
not restore kernel log level if lowering it failed.
* plugins.d/mandos-client.xml (OPTIONS): Document that the
"--interface" option accepts
an empty string.
(EXAMPLE): Change example IPv6 address to a link-local address.
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
53
50
sockaddr_in6, PF_INET6,
54
51
SOCK_STREAM, uid_t, gid_t, open(),
55
52
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
#include <sys/stat.h> /* open() */
57
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
55
inet_pton(), connect() */
59
56
#include <fcntl.h> /* open() */
60
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
58
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
60
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
73
#include <iso646.h> /* not, or, and */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
91
78
#ifdef __linux__
92
79
#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
80
#endif
94
81
95
82
/* Avahi */
96
83
/* All Avahi types, constants and functions
110
97
init_gnutls_session(),
111
98
GNUTLS_* */
112
99
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
115
102
116
103
/* GPGME */
117
104
#include <gpgme.h> /* All GPGME types, constants and
125
112
#define PATHDIR "/conf/conf.d/mandos"
126
113
#define SECKEY "seckey.txt"
127
114
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
115
130
116
bool debug = false;
131
117
static const char mandos_protocol_version[] = "1";
132
118
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
120
149
121
/* Used for passing in values through the Avahi callback functions */
150
122
typedef struct {
155
127
gnutls_dh_params_t dh_params;
156
128
const char *priority;
157
129
gpgme_ctx_t ctx;
158
server *current_server;
159
130
} mandos_context;
160
131
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
}
184
185
132
/*
186
* Make additional room in "buffer" for at least BUFFER_SIZE more
187
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
188
135
* "buffer_length" is how much is already used.
189
136
*/
190
size_t incbuffer(char **buffer, size_t buffer_length,
191
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
192
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
141
if(buffer == NULL){
199
146
return buffer_capacity;
200
147
}
201
148
202
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
205
int ret;
206
server *new_server = malloc(sizeof(server));
207
if(new_server == NULL){
208
perror_plus("malloc");
209
return -1;
210
}
211
*new_server = (server){ .ip = strdup(ip),
212
.port = port,
213
.if_index = if_index,
214
.af = af };
215
if(new_server->ip == NULL){
216
perror_plus("strdup");
217
return -1;
218
}
219
/* Special case of first server */
220
if (mc.current_server == NULL){
221
new_server->next = new_server;
222
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
225
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
228
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
237
}
238
239
149
/*
240
150
* Initialize GPGME.
241
151
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
244
155
gpgme_error_t rc;
245
156
gpgme_engine_info_t engine_info;
246
157
249
160
* Helper function to insert pub and seckey to the engine keyring.
250
161
*/
251
162
bool import_key(const char *filename){
252
int ret;
253
163
int fd;
254
164
gpgme_data_t pgp_data;
255
165
256
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
257
167
if(fd == -1){
258
perror_plus("open");
168
perror("open");
259
169
return false;
260
170
}
261
171
262
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
173
if(rc != GPG_ERR_NO_ERROR){
264
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
265
175
gpgme_strsource(rc), gpgme_strerror(rc));
266
176
return false;
267
177
}
268
178
269
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
270
180
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
272
182
gpgme_strsource(rc), gpgme_strerror(rc));
273
183
return false;
274
184
}
275
185
276
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
277
187
if(ret == -1){
278
perror_plus("close");
188
perror("close");
279
189
}
280
190
gpgme_data_release(pgp_data);
281
191
return true;
282
192
}
283
193
284
194
if(debug){
285
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
286
196
}
287
197
288
198
/* Init GPGME */
289
199
gpgme_check_version(NULL);
290
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
291
201
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
293
203
gpgme_strsource(rc), gpgme_strerror(rc));
294
204
return false;
295
205
}
296
206
297
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
298
208
rc = gpgme_get_engine_info(&engine_info);
299
209
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
301
211
gpgme_strsource(rc), gpgme_strerror(rc));
302
212
return false;
303
213
}
310
220
engine_info = engine_info->next;
311
221
}
312
222
if(engine_info == NULL){
313
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n", tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
314
224
return false;
315
225
}
316
226
317
227
/* Create new GPGME "context" */
318
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
319
229
if(rc != GPG_ERR_NO_ERROR){
320
fprintf_plus(stderr, "Mandos plugin mandos-client: "
321
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
322
gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
323
232
return false;
324
233
}
325
234
327
236
return false;
328
237
}
329
238
330
return true;
239
return true;
331
240
}
332
241
333
242
/*
334
243
* Decrypt OpenPGP data.
335
244
* Returns -1 on error
336
245
*/
337
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
338
248
size_t crypto_size,
339
249
char **plaintext){
340
250
gpgme_data_t dh_crypto, dh_plain;
344
254
ssize_t plaintext_length = 0;
345
255
346
256
if(debug){
347
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
348
258
}
349
259
350
260
/* Create new GPGME data buffer from memory cryptotext */
351
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
262
0);
353
263
if(rc != GPG_ERR_NO_ERROR){
354
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
265
gpgme_strsource(rc), gpgme_strerror(rc));
356
266
return -1;
357
267
}
359
269
/* Create new empty GPGME data buffer for the plaintext */
360
270
rc = gpgme_data_new(&dh_plain);
361
271
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
364
273
gpgme_strsource(rc), gpgme_strerror(rc));
365
274
gpgme_data_release(dh_crypto);
366
275
return -1;
368
277
369
278
/* Decrypt data from the cryptotext data buffer to the plaintext
370
279
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
281
if(rc != GPG_ERR_NO_ERROR){
373
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
374
283
gpgme_strsource(rc), gpgme_strerror(rc));
375
284
plaintext_length = -1;
376
285
if(debug){
377
286
gpgme_decrypt_result_t result;
378
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
379
288
if(result == NULL){
380
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
381
290
} else {
382
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
291
fprintf(stderr, "Unsupported algorithm: %s\n",
383
292
result->unsupported_algorithm);
384
fprintf_plus(stderr, "Wrong key usage: %u\n",
293
fprintf(stderr, "Wrong key usage: %u\n",
385
294
result->wrong_key_usage);
386
295
if(result->file_name != NULL){
387
fprintf_plus(stderr, "File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
388
297
}
389
298
gpgme_recipient_t recipient;
390
299
recipient = result->recipients;
391
while(recipient != NULL){
392
fprintf_plus(stderr, "Public key algorithm: %s\n",
393
gpgme_pubkey_algo_name(recipient->pubkey_algo));
394
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
395
fprintf_plus(stderr, "Secret key available: %s\n",
396
recipient->status == GPG_ERR_NO_SECKEY
397
? "No" : "Yes");
398
recipient = recipient->next;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
399
310
}
400
311
}
401
312
}
403
314
}
404
315
405
316
if(debug){
406
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
407
318
}
408
319
409
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
410
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
411
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
412
323
plaintext_length = -1;
413
324
goto decrypt_end;
414
325
}
415
326
416
327
*plaintext = NULL;
417
328
while(true){
418
plaintext_capacity = incbuffer(plaintext,
419
(size_t)plaintext_length,
420
plaintext_capacity);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
421
332
if(plaintext_capacity == 0){
422
perror_plus("incbuffer");
423
plaintext_length = -1;
424
goto decrypt_end;
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
425
336
}
426
337
427
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
432
343
break;
433
344
}
434
345
if(ret < 0){
435
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
436
347
plaintext_length = -1;
437
348
goto decrypt_end;
438
349
}
440
351
}
441
352
442
353
if(debug){
443
fprintf_plus(stderr, "Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
444
355
for(ssize_t i = 0; i < plaintext_length; i++){
445
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
446
357
}
468
379
/* GnuTLS log function callback */
469
380
static void debuggnutls(__attribute__((unused)) int level,
470
381
const char* string){
471
fprintf_plus(stderr, "GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
472
383
}
473
384
474
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
475
387
const char *seckeyfilename){
476
388
int ret;
477
389
478
390
if(debug){
479
fprintf_plus(stderr, "Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
480
392
}
481
393
482
394
ret = gnutls_global_init();
483
395
if(ret != GNUTLS_E_SUCCESS){
484
fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
485
398
return -1;
486
399
}
487
400
494
407
}
495
408
496
409
/* OpenPGP credentials */
497
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
498
411
if(ret != GNUTLS_E_SUCCESS){
499
fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
from
414
-Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
500
417
gnutls_global_deinit();
501
418
return -1;
502
419
}
503
420
504
421
if(debug){
505
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
506
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
507
424
seckeyfilename);
508
425
}
509
426
510
427
ret = gnutls_certificate_set_openpgp_key_file
511
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
512
429
GNUTLS_OPENPGP_FMT_BASE64);
513
430
if(ret != GNUTLS_E_SUCCESS){
514
fprintf_plus(stderr,
515
"Error[%d] while reading the OpenPGP key pair ('%s',"
516
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
517
fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
518
436
goto globalfail;
519
437
}
520
438
521
439
/* GnuTLS server initialization */
522
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
523
441
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
525
443
" %s\n", safer_gnutls_strerror(ret));
526
444
goto globalfail;
527
445
}
528
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
529
447
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
531
449
safer_gnutls_strerror(ret));
532
450
goto globalfail;
533
451
}
534
452
535
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
536
454
537
455
return 0;
538
456
539
457
globalfail:
540
458
541
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
542
460
gnutls_global_deinit();
543
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
544
462
return -1;
545
463
}
546
464
547
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
548
467
int ret;
549
468
/* GnuTLS session creation */
550
do {
551
ret = gnutls_init(session, GNUTLS_SERVER);
552
if(quit_now){
553
return -1;
554
}
555
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
556
470
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS session initialization: %s\n",
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
558
472
safer_gnutls_strerror(ret));
559
473
}
560
474
561
475
{
562
476
const char *err;
563
do {
564
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
565
if(quit_now){
566
gnutls_deinit(*session);
567
return -1;
568
}
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
570
478
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Syntax error at: %s\n", err);
572
fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
573
482
gnutls_deinit(*session);
574
483
return -1;
575
484
}
576
485
}
577
486
578
do {
579
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
581
if(quit_now){
582
gnutls_deinit(*session);
583
return -1;
584
}
585
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
586
489
if(ret != GNUTLS_E_SUCCESS){
587
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
588
491
safer_gnutls_strerror(ret));
589
492
gnutls_deinit(*session);
590
493
return -1;
591
494
}
592
495
593
496
/* ignore client certificate if any. */
594
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
595
499
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
597
501
598
502
return 0;
599
503
}
605
509
/* Called when a Mandos server is found */
606
510
static int start_mandos_communication(const char *ip, uint16_t port,
607
511
AvahiIfIndex if_index,
608
int af){
609
int ret, tcp_sd = -1;
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
610
514
ssize_t sret;
611
515
union {
612
516
struct sockaddr_in in;
613
517
struct sockaddr_in6 in6;
614
518
} to;
615
519
char *buffer = NULL;
616
char *decrypted_buffer = NULL;
520
char *decrypted_buffer;
617
521
size_t buffer_length = 0;
618
522
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
619
524
size_t written;
620
int retval = -1;
525
int retval = 0;
621
526
gnutls_session_t session;
622
527
int pf; /* Protocol family */
623
528
624
errno = 0;
625
626
if(quit_now){
627
errno = EINTR;
628
return -1;
629
}
630
631
529
switch(af){
632
530
case AF_INET6:
633
531
pf = PF_INET6;
636
534
pf = PF_INET;
637
535
break;
638
536
default:
639
fprintf_plus(stderr, "Bad address family: %d\n", af);
640
errno = EINVAL;
537
fprintf(stderr, "Bad address family: %d\n", af);
641
538
return -1;
642
539
}
643
540
644
ret = init_gnutls_session(&session);
541
ret = init_gnutls_session(mc, &session);
645
542
if(ret != 0){
646
543
return -1;
647
544
}
648
545
649
546
if(debug){
650
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %" PRIu16
547
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
548
"\n", ip, port);
652
549
}
653
550
654
551
tcp_sd = socket(pf, SOCK_STREAM, 0);
655
552
if(tcp_sd < 0){
656
int e = errno;
657
perror_plus("socket");
658
errno = e;
659
goto mandos_end;
660
}
661
662
if(quit_now){
663
errno = EINTR;
664
goto mandos_end;
553
perror("socket");
554
return -1;
665
555
}
666
556
667
557
memset(&to, 0, sizeof(to));
668
558
if(af == AF_INET6){
669
to.in6.sin6_family = (sa_family_t)af;
559
to.in6.sin6_family = (uint16_t)af;
670
560
ret = inet_pton(af, ip, &to.in6.sin6_addr);
671
561
} else { /* IPv4 */
672
562
to.in.sin_family = (sa_family_t)af;
673
563
ret = inet_pton(af, ip, &to.in.sin_addr);
674
564
}
675
565
if(ret < 0 ){
676
int e = errno;
677
perror_plus("inet_pton");
678
errno = e;
679
goto mandos_end;
566
perror("inet_pton");
567
return -1;
680
568
}
681
569
if(ret == 0){
682
int e = errno;
683
fprintf_plus(stderr, "Bad address: %s\n", ip);
684
errno = e;
685
goto mandos_end;
570
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
686
572
}
687
573
if(af == AF_INET6){
688
574
to.in6.sin6_port = htons(port); /* Spurious warnings from
691
577
692
578
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
579
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
580
-Wunreachable-code*/
695
581
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf_plus(stderr, "An IPv6 link-local address is incomplete"
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
697
583
" without a network interface\n");
698
errno = EINVAL;
699
goto mandos_end;
584
return -1;
700
585
}
701
586
/* Set the network interface number as scope */
702
587
to.in6.sin6_scope_id = (uint32_t)if_index;
707
592
-Wunreachable-code */
708
593
}
709
594
710
if(quit_now){
711
errno = EINTR;
712
goto mandos_end;
713
}
714
715
595
if(debug){
716
596
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
717
597
char interface[IF_NAMESIZE];
718
598
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
perror_plus("if_indextoname");
599
perror("if_indextoname");
720
600
} else {
721
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
601
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
602
ip, interface, port);
723
603
}
724
604
} else {
725
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);
605
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
606
port);
726
607
}
727
608
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
728
609
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
735
616
sizeof(addrstr));
736
617
}
737
618
if(pcret == NULL){
738
perror_plus("inet_ntop");
619
perror("inet_ntop");
739
620
} else {
740
621
if(strcmp(addrstr, ip) != 0){
741
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
622
fprintf(stderr, "Canonical address form: %s\n", addrstr);
742
623
}
743
624
}
744
625
}
745
626
746
if(quit_now){
747
errno = EINTR;
748
goto mandos_end;
749
}
750
751
627
if(af == AF_INET6){
752
628
ret = connect(tcp_sd, &to.in6, sizeof(to));
753
629
} else {
754
630
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
755
631
}
756
632
if(ret < 0){
757
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
758
int e = errno;
759
perror_plus("connect");
760
errno = e;
761
}
762
goto mandos_end;
763
}
764
765
if(quit_now){
766
errno = EINTR;
767
goto mandos_end;
633
perror("connect");
634
return -1;
768
635
}
769
636
770
637
const char *out = mandos_protocol_version;
772
639
while(true){
773
640
size_t out_size = strlen(out);
774
641
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
775
out_size - written));
642
out_size - written));
776
643
if(ret == -1){
777
int e = errno;
778
perror_plus("write");
779
errno = e;
644
perror("write");
645
retval = -1;
780
646
goto mandos_end;
781
647
}
782
648
written += (size_t)ret;
790
656
break;
791
657
}
792
658
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
659
}
799
660
800
661
if(debug){
801
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
802
}
803
804
if(quit_now){
805
errno = EINTR;
806
goto mandos_end;
807
}
808
809
/* Spurious warning from -Wint-to-pointer-cast */
662
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
}
664
810
665
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
811
666
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
816
817
do {
667
do{
818
668
ret = gnutls_handshake(session);
819
if(quit_now){
820
errno = EINTR;
821
goto mandos_end;
822
}
823
669
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
824
670
825
671
if(ret != GNUTLS_E_SUCCESS){
826
672
if(debug){
827
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
828
674
gnutls_perror(ret);
829
675
}
830
errno = EPROTO;
676
retval = -1;
831
677
goto mandos_end;
832
678
}
833
679
834
680
/* Read OpenPGP packet that contains the wanted password */
835
681
836
682
if(debug){
837
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);
683
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
684
ip);
838
685
}
839
686
840
687
while(true){
841
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
buffer_capacity = incbuffer(&buffer, buffer_length,
848
buffer_capacity);
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
689
buffer_capacity);
849
690
if(buffer_capacity == 0){
850
int e = errno;
851
perror_plus("incbuffer");
852
errno = e;
853
goto mandos_end;
854
}
855
856
if(quit_now){
857
errno = EINTR;
691
perror("adjustbuffer");
692
retval = -1;
858
693
goto mandos_end;
859
694
}
860
695
869
704
case GNUTLS_E_AGAIN:
870
705
break;
871
706
case GNUTLS_E_REHANDSHAKE:
872
do {
707
do{
873
708
ret = gnutls_handshake(session);
874
875
if(quit_now){
876
errno = EINTR;
877
goto mandos_end;
878
}
879
709
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
880
710
if(ret < 0){
881
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
882
712
gnutls_perror(ret);
883
errno = EPROTO;
713
retval = -1;
884
714
goto mandos_end;
885
715
}
886
716
break;
887
717
default:
888
fprintf_plus(stderr, "Unknown error while reading data from"
718
fprintf(stderr, "Unknown error while reading data from"
889
719
" encrypted session with Mandos server\n");
720
retval = -1;
890
721
gnutls_bye(session, GNUTLS_SHUT_RDWR);
891
errno = EIO;
892
722
goto mandos_end;
893
723
}
894
724
} else {
897
727
}
898
728
899
729
if(debug){
900
fprintf_plus(stderr, "Closing TLS session\n");
901
}
902
903
if(quit_now){
904
errno = EINTR;
905
goto mandos_end;
906
}
907
908
do {
909
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
910
if(quit_now){
911
errno = EINTR;
912
goto mandos_end;
913
}
914
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
fprintf(stderr, "Closing TLS session\n");
731
}
732
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
915
734
916
735
if(buffer_length > 0){
917
ssize_t decrypted_buffer_size;
918
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
737
buffer_length,
919
738
&decrypted_buffer);
920
739
if(decrypted_buffer_size >= 0){
921
922
740
written = 0;
923
741
while(written < (size_t) decrypted_buffer_size){
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
929
742
ret = (int)fwrite(decrypted_buffer + written, 1,
930
743
(size_t)decrypted_buffer_size - written,
931
744
stdout);
932
745
if(ret == 0 and ferror(stdout)){
933
int e = errno;
934
746
if(debug){
935
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
747
fprintf(stderr, "Error writing encrypted data: %s\n",
936
748
strerror(errno));
937
749
}
938
errno = e;
939
goto mandos_end;
750
retval = -1;
751
break;
940
752
}
941
753
written += (size_t)ret;
942
754
}
943
retval = 0;
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
944
758
}
759
} else {
760
retval = -1;
945
761
}
946
762
947
763
/* Shutdown procedure */
948
764
949
765
mandos_end:
950
{
951
int e = errno;
952
free(decrypted_buffer);
953
free(buffer);
954
if(tcp_sd >= 0){
955
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
956
}
957
if(ret == -1){
958
if(e == 0){
959
e = errno;
960
}
961
perror_plus("close");
962
}
963
gnutls_deinit(session);
964
errno = e;
965
if(quit_now){
966
errno = EINTR;
967
retval = -1;
968
}
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
969
770
}
771
gnutls_deinit(session);
970
772
return retval;
971
773
}
972
774
983
785
AVAHI_GCC_UNUSED AvahiStringList *txt,
984
786
AVAHI_GCC_UNUSED AvahiLookupResultFlags
985
787
flags,
986
AVAHI_GCC_UNUSED void* userdata){
788
void* userdata){
789
mandos_context *mc = userdata;
987
790
assert(r);
988
791
989
792
/* Called whenever a service has been resolved successfully or
990
793
timed out */
991
794
992
if(quit_now){
993
return;
994
}
995
996
795
switch(event){
997
796
default:
998
797
case AVAHI_RESOLVER_FAILURE:
999
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
798
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1000
799
" of type '%s' in domain '%s': %s\n", name, type, domain,
1001
avahi_strerror(avahi_server_errno(mc.server)));
800
avahi_strerror(avahi_server_errno(mc->server)));
1002
801
break;
1003
802
1004
803
case AVAHI_RESOLVER_FOUND:
1006
805
char ip[AVAHI_ADDRESS_STR_MAX];
1007
806
avahi_address_snprint(ip, sizeof(ip), address);
1008
807
if(debug){
1009
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
808
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1010
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1011
810
ip, (intmax_t)interface, port);
1012
811
}
1013
int ret = start_mandos_communication(ip, port, interface,
812
int ret = start_mandos_communication(ip, port, interface, mc,
1014
813
avahi_proto_to_af(proto));
1015
814
if(ret == 0){
1016
avahi_simple_poll_quit(mc.simple_poll);
1017
} else {
1018
ret = add_server(ip, port, interface,
1019
avahi_proto_to_af(proto));
815
avahi_simple_poll_quit(mc->simple_poll);
1020
816
}
1021
817
}
1022
818
}
1032
828
const char *domain,
1033
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1034
830
flags,
1035
AVAHI_GCC_UNUSED void* userdata){
831
void* userdata){
832
mandos_context *mc = userdata;
1036
833
assert(b);
1037
834
1038
835
/* Called whenever a new services becomes available on the LAN or
1039
836
is removed from the LAN */
1040
837
1041
if(quit_now){
1042
return;
1043
}
1044
1045
838
switch(event){
1046
839
default:
1047
840
case AVAHI_BROWSER_FAILURE:
1048
841
1049
fprintf_plus(stderr, "(Avahi browser) %s\n",
1050
avahi_strerror(avahi_server_errno(mc.server)));
1051
avahi_simple_poll_quit(mc.simple_poll);
842
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
1052
845
return;
1053
846
1054
847
case AVAHI_BROWSER_NEW:
1057
850
the callback function is called the Avahi server will free the
1058
851
resolver for us. */
1059
852
1060
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1061
name, type, domain, protocol, 0,
1062
resolve_callback, NULL) == NULL)
1063
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1064
name, avahi_strerror(avahi_server_errno(mc.server)));
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
857
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
1065
859
break;
1066
860
1067
861
case AVAHI_BROWSER_REMOVE:
1070
864
case AVAHI_BROWSER_ALL_FOR_NOW:
1071
865
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1072
866
if(debug){
1073
fprintf_plus(stderr, "No Mandos server found, still searching...\n");
867
fprintf(stderr, "No Mandos server found, still searching...\n");
1074
868
}
1075
869
break;
1076
870
}
1077
871
}
1078
872
1079
/* Signal handler that stops main loop after SIGTERM */
1080
static void handle_sigterm(int sig){
1081
if(quit_now){
1082
return;
1083
}
1084
quit_now = 1;
1085
signal_received = sig;
1086
int old_errno = errno;
1087
/* set main loop to exit */
1088
if(mc.simple_poll != NULL){
1089
avahi_simple_poll_quit(mc.simple_poll);
1090
}
1091
errno = old_errno;
1092
}
1093
1094
bool get_flags(const char *ifname, struct ifreq *ifr){
1095
int ret;
1096
1097
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1098
if(s < 0){
1099
perror_plus("socket");
1100
return false;
1101
}
1102
strcpy(ifr->ifr_name, ifname);
1103
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1104
if(ret == -1){
1105
if(debug){
1106
perror_plus("ioctl SIOCGIFFLAGS");
1107
}
1108
return false;
1109
}
1110
return true;
1111
}
1112
1113
bool good_flags(const char *ifname, const struct ifreq *ifr){
1114
1115
/* Reject the loopback device */
1116
if(ifr->ifr_flags & IFF_LOOPBACK){
1117
if(debug){
1118
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n", ifname);
1119
}
1120
return false;
1121
}
1122
/* Accept point-to-point devices only if connect_to is specified */
1123
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1124
if(debug){
1125
fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);
1126
}
1127
return true;
1128
}
1129
/* Otherwise, reject non-broadcast-capable devices */
1130
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1131
if(debug){
1132
fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);
1133
}
1134
return false;
1135
}
1136
/* Reject non-ARP interfaces (including dummy interfaces) */
1137
if(ifr->ifr_flags & IFF_NOARP){
1138
if(debug){
1139
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1140
}
1141
return false;
1142
}
1143
1144
/* Accept this device */
1145
if(debug){
1146
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1147
}
1148
return true;
1149
}
1150
1151
/*
1152
* This function determines if a directory entry in /sys/class/net
1153
* corresponds to an acceptable network device.
1154
* (This function is passed to scandir(3) as a filter function.)
1155
*/
1156
int good_interface(const struct dirent *if_entry){
1157
if(if_entry->d_name[0] == '.'){
1158
return 0;
1159
}
1160
1161
struct ifreq ifr;
1162
if(not get_flags(if_entry->d_name, &ifr)){
1163
if(debug){
1164
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 0;
1168
}
1169
1170
if(not good_flags(if_entry->d_name, &ifr)){
1171
return 0;
1172
}
1173
return 1;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device which is up.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int up_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1190
if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
/* Reject down interfaces */
1196
if(not (ifr.ifr_flags & IFF_UP)){
1197
if(debug){
1198
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1199
if_entry->d_name);
1200
}
1201
return 0;
1202
}
1203
1204
/* Reject non-running interfaces */
1205
if(not (ifr.ifr_flags & IFF_RUNNING)){
1206
if(debug){
1207
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1208
if_entry->d_name);
1209
}
1210
return 0;
1211
}
1212
1213
if(not good_flags(if_entry->d_name, &ifr)){
1214
return 0;
1215
}
1216
return 1;
1217
}
1218
1219
int notdotentries(const struct dirent *direntry){
1220
/* Skip "." and ".." */
1221
if(direntry->d_name[0] == '.'
1222
and (direntry->d_name[1] == '\0'
1223
or (direntry->d_name[1] == '.'
1224
and direntry->d_name[2] == '\0'))){
1225
return 0;
1226
}
1227
return 1;
1228
}
1229
1230
/* Is this directory entry a runnable program? */
1231
int runnable_hook(const struct dirent *direntry){
1232
int ret;
1233
size_t sret;
1234
struct stat st;
1235
1236
if((direntry->d_name)[0] == '\0'){
1237
/* Empty name? */
1238
return 0;
1239
}
1240
1241
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1242
"abcdefghijklmnopqrstuvwxyz"
1243
"0123456789"
1244
"_-");
1245
if((direntry->d_name)[sret] != '\0'){
1246
/* Contains non-allowed characters */
1247
if(debug){
1248
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1249
direntry->d_name);
1250
}
1251
return 0;
1252
}
1253
1254
char *fullname = NULL;
1255
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1256
if(ret < 0){
1257
perror_plus("asprintf");
1258
return 0;
1259
}
1260
1261
ret = stat(fullname, &st);
1262
if(ret == -1){
1263
if(debug){
1264
perror_plus("Could not stat hook");
1265
}
1266
return 0;
1267
}
1268
if(not (S_ISREG(st.st_mode))){
1269
/* Not a regular file */
1270
if(debug){
1271
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1272
direntry->d_name);
1273
}
1274
return 0;
1275
}
1276
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1277
/* Not executable */
1278
if(debug){
1279
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1280
direntry->d_name);
1281
}
1282
return 0;
1283
}
1284
return 1;
1285
}
1286
1287
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1288
int ret;
1289
struct timespec now;
1290
struct timespec waited_time;
1291
intmax_t block_time;
1292
1293
while(true){
1294
if(mc.current_server == NULL){
1295
if (debug){
1296
fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");
1297
}
1298
ret = avahi_simple_poll_iterate(s, -1);
1299
} else {
1300
if (debug){
1301
fprintf_plus(stderr, "Check current_server if we should run it,"
1302
" or wait\n");
1303
}
1304
/* the current time */
1305
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1306
if(ret == -1){
1307
perror_plus("clock_gettime");
1308
return -1;
1309
}
1310
/* Calculating in ms how long time between now and server
1311
who we visted longest time ago. Now - last seen. */
1312
waited_time.tv_sec = (now.tv_sec
1313
- mc.current_server->last_seen.tv_sec);
1314
waited_time.tv_nsec = (now.tv_nsec
1315
- mc.current_server->last_seen.tv_nsec);
1316
/* total time is 10s/10,000ms.
1317
Converting to s from ms by dividing by 1,000,
1318
and ns to ms by dividing by 1,000,000. */
1319
block_time = ((retry_interval
1320
- ((intmax_t)waited_time.tv_sec * 1000))
1321
- ((intmax_t)waited_time.tv_nsec / 1000000));
1322
1323
if (debug){
1324
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1325
}
1326
1327
if(block_time <= 0){
1328
ret = start_mandos_communication(mc.current_server->ip,
1329
mc.current_server->port,
1330
mc.current_server->if_index,
1331
mc.current_server->af);
1332
if(ret == 0){
1333
avahi_simple_poll_quit(mc.simple_poll);
1334
return 0;
1335
}
1336
ret = clock_gettime(CLOCK_MONOTONIC,
1337
&mc.current_server->last_seen);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
mc.current_server = mc.current_server->next;
1343
block_time = 0; /* Call avahi to find new Mandos
1344
servers, but don't block */
1345
}
1346
1347
ret = avahi_simple_poll_iterate(s, (int)block_time);
1348
}
1349
if(ret != 0){
1350
if (ret > 0 or errno != EINTR){
1351
return (ret != 1) ? ret : 0;
1352
}
1353
}
1354
}
1355
}
1356
1357
873
int main(int argc, char *argv[]){
1358
874
AvahiSServiceBrowser *sb = NULL;
1359
875
int error;
1360
876
int ret;
1361
877
intmax_t tmpmax;
1362
char *tmp;
878
int numchars;
1363
879
int exitcode = EXIT_SUCCESS;
1364
const char *interface = "";
880
const char *interface = "eth0";
1365
881
struct ifreq network;
1366
int sd = -1;
1367
bool take_down_interface = false;
882
int sd;
1368
883
uid_t uid;
1369
884
gid_t gid;
885
char *connect_to = NULL;
1370
886
char tempdir[] = "/tmp/mandosXXXXXX";
1371
887
bool tempdir_created = false;
1372
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1373
889
const char *seckey = PATHDIR "/" SECKEY;
1374
890
const char *pubkey = PATHDIR "/" PUBKEY;
1375
891
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1376
895
bool gnutls_initialized = false;
1377
896
bool gpgme_initialized = false;
1378
float delay = 2.5f;
1379
double retry_interval = 10; /* 10s between trying a server and
1380
retrying the same server again */
1381
1382
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1383
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1384
1385
uid = getuid();
1386
gid = getgid();
1387
1388
/* Lower any group privileges we might have, just to be safe */
1389
errno = 0;
1390
ret = setgid(gid);
1391
if(ret == -1){
1392
perror_plus("setgid");
1393
}
1394
1395
/* Lower user privileges (temporarily) */
1396
errno = 0;
1397
ret = seteuid(uid);
1398
if(ret == -1){
1399
perror_plus("seteuid");
1400
}
1401
1402
if(quit_now){
1403
goto end;
1404
}
897
double delay = 2.5;
1405
898
1406
899
{
1407
900
struct argp_option options[] = {
1437
930
.arg = "SECONDS",
1438
931
.doc = "Maximum delay to wait for interface startup",
1439
932
.group = 2 },
1440
{ .name = "retry", .key = 132,
1441
.arg = "SECONDS",
1442
.doc = "Retry interval used when denied by the mandos server",
1443
.group = 2 },
1444
{ .name = "network-hook-dir", .key = 133,
1445
.arg = "DIR",
1446
.doc = "Directory where network hooks are located",
1447
.group = 2 },
1448
/*
1449
* These reproduce what we would get without ARGP_NO_HELP
1450
*/
1451
{ .name = "help", .key = '?',
1452
.doc = "Give this help list", .group = -1 },
1453
{ .name = "usage", .key = -3,
1454
.doc = "Give a short usage message", .group = -1 },
1455
{ .name = "version", .key = 'V',
1456
.doc = "Print program version", .group = -1 },
1457
933
{ .name = NULL }
1458
934
};
1459
935
1460
936
error_t parse_opt(int key, char *arg,
1461
937
struct argp_state *state){
1462
errno = 0;
1463
938
switch(key){
1464
939
case 128: /* --debug */
1465
940
debug = true;
1477
952
pubkey = arg;
1478
953
break;
1479
954
case 129: /* --dh-bits */
1480
errno = 0;
1481
tmpmax = strtoimax(arg, &tmp, 10);
1482
if(errno != 0 or tmp == arg or *tmp != '\0'
1483
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1484
argp_error(state, "Bad number of DH bits");
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
958
fprintf(stderr, "Bad number of DH bits\n");
959
exit(EXIT_FAILURE);
1485
960
}
1486
961
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1487
962
break;
1489
964
mc.priority = arg;
1490
965
break;
1491
966
case 131: /* --delay */
1492
errno = 0;
1493
delay = strtof(arg, &tmp);
1494
if(errno != 0 or tmp == arg or *tmp != '\0'){
1495
argp_error(state, "Bad delay");
1496
}
1497
case 132: /* --retry */
1498
errno = 0;
1499
retry_interval = strtod(arg, &tmp);
1500
if(errno != 0 or tmp == arg or *tmp != '\0'
1501
or (retry_interval * 1000) > INT_MAX
1502
or retry_interval < 0){
1503
argp_error(state, "Bad retry interval");
1504
}
1505
break;
1506
case 133: /* --network-hook-dir */
1507
hookdir = arg;
1508
break;
1509
/*
1510
* These reproduce what we would get without ARGP_NO_HELP
1511
*/
1512
case '?': /* --help */
1513
argp_state_help(state, state->out_stream,
1514
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1515
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1516
case -3: /* --usage */
1517
argp_state_help(state, state->out_stream,
1518
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1519
case 'V': /* --version */
1520
fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");
1521
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1522
exit(argp_err_exit_status);
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
970
exit(EXIT_FAILURE);
971
}
972
break;
973
case ARGP_KEY_ARG:
974
argp_usage(state);
975
case ARGP_KEY_END:
1523
976
break;
1524
977
default:
1525
978
return ARGP_ERR_UNKNOWN;
1526
979
}
1527
return errno;
980
return 0;
1528
981
}
1529
982
1530
983
struct argp argp = { .options = options, .parser = parse_opt,
1531
984
.args_doc = "",
1532
985
.doc = "Mandos client -- Get and decrypt"
1533
986
" passwords from a Mandos server" };
1534
ret = argp_parse(&argp, argc, argv,
1535
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1536
switch(ret){
1537
case 0:
1538
break;
1539
case ENOMEM:
1540
default:
1541
errno = ret;
1542
perror_plus("argp_parse");
1543
exitcode = EX_OSERR;
1544
goto end;
1545
case EINVAL:
1546
exitcode = EX_USAGE;
1547
goto end;
1548
}
1549
}
1550
1551
{
1552
/* Work around Debian bug #633582:
1553
<http://bugs.debian.org/633582> */
1554
struct stat st;
1555
1556
/* Re-raise priviliges */
1557
errno = 0;
1558
ret = seteuid(0);
1559
if(ret == -1){
1560
perror_plus("seteuid");
1561
}
1562
1563
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1564
int seckey_fd = open(seckey, O_RDONLY);
1565
if(seckey_fd == -1){
1566
perror_plus("open");
1567
} else {
1568
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1569
if(ret == -1){
1570
perror_plus("fstat");
1571
} else {
1572
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1573
ret = fchown(seckey_fd, uid, gid);
1574
if(ret == -1){
1575
perror_plus("fchown");
1576
}
1577
}
1578
}
1579
TEMP_FAILURE_RETRY(close(seckey_fd));
1580
}
1581
}
1582
1583
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1584
int pubkey_fd = open(pubkey, O_RDONLY);
1585
if(pubkey_fd == -1){
1586
perror_plus("open");
1587
} else {
1588
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1589
if(ret == -1){
1590
perror_plus("fstat");
1591
} else {
1592
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1593
ret = fchown(pubkey_fd, uid, gid);
1594
if(ret == -1){
1595
perror_plus("fchown");
1596
}
1597
}
1598
}
1599
TEMP_FAILURE_RETRY(close(pubkey_fd));
1600
}
1601
}
1602
1603
/* Lower privileges */
1604
errno = 0;
1605
ret = seteuid(uid);
1606
if(ret == -1){
1607
perror_plus("seteuid");
1608
}
1609
}
1610
1611
/* Find network hooks and run them */
1612
{
1613
struct dirent **direntries;
1614
struct dirent *direntry;
1615
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1616
alphasort);
1617
if(numhooks == -1){
1618
perror_plus("scandir");
1619
} else {
1620
int devnull = open("/dev/null", O_RDONLY);
1621
for(int i = 0; i < numhooks; i++){
1622
direntry = direntries[0];
1623
char *fullname = NULL;
1624
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1625
if(ret < 0){
1626
perror_plus("asprintf");
1627
continue;
1628
}
1629
pid_t hook_pid = fork();
1630
if(hook_pid == 0){
1631
/* Child */
1632
dup2(devnull, STDIN_FILENO);
1633
close(devnull);
1634
dup2(STDERR_FILENO, STDOUT_FILENO);
1635
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
exit(1);
1639
}
1640
ret = setenv("DEVICE", interface, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
exit(1);
1644
}
1645
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1646
if(ret == -1){
1647
perror_plus("setenv");
1648
exit(1);
1649
}
1650
ret = setenv("MODE", "start", 1);
1651
if(ret == -1){
1652
perror_plus("setenv");
1653
exit(1);
1654
}
1655
char *delaystring;
1656
ret = asprintf(&delaystring, "%f", delay);
1657
if(ret == -1){
1658
perror_plus("asprintf");
1659
exit(1);
1660
}
1661
ret = setenv("DELAY", delaystring, 1);
1662
if(ret == -1){
1663
free(delaystring);
1664
perror_plus("setenv");
1665
exit(1);
1666
}
1667
free(delaystring);
1668
ret = execl(fullname, direntry->d_name, "start", NULL);
1669
perror_plus("execl");
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
free(fullname);
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
free(fullname);
1683
continue;
1684
}
1685
} else if(WIFSIGNALED(status)){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1687
" signal %d\n", direntry->d_name,
1688
WTERMSIG(status));
1689
free(fullname);
1690
continue;
1691
} else {
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" crashed\n",
1693
direntry->d_name);
1694
free(fullname);
1695
continue;
1696
}
1697
}
1698
free(fullname);
1699
if(quit_now){
1700
goto end;
1701
}
1702
}
1703
close(devnull);
1704
}
1705
}
1706
1707
if(not debug){
1708
avahi_set_log_function(empty_log);
1709
}
1710
1711
if(interface[0] == '\0'){
1712
struct dirent **direntries;
1713
/* First look for interfaces that are up */
1714
ret = scandir(sys_class_net, &direntries, up_interface,
1715
alphasort);
1716
if(ret == 0){
1717
/* No up interfaces, look for any good interfaces */
1718
free(direntries);
1719
ret = scandir(sys_class_net, &direntries, good_interface,
1720
alphasort);
1721
}
1722
if(ret >= 1){
1723
/* Pick the first interface returned */
1724
interface = strdup(direntries[0]->d_name);
1725
if(debug){
1726
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1727
}
1728
if(interface == NULL){
1729
perror_plus("malloc");
1730
free(direntries);
1731
exitcode = EXIT_FAILURE;
1732
goto end;
1733
}
1734
free(direntries);
1735
} else {
1736
free(direntries);
1737
fprintf_plus(stderr, "Could not find a network interface\n");
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
1738
990
exitcode = EXIT_FAILURE;
1739
991
goto end;
1740
992
}
1741
993
}
1742
994
1743
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1744
from the signal handler */
1745
/* Initialize the pseudo-RNG for Avahi */
1746
srand((unsigned int) time(NULL));
1747
mc.simple_poll = avahi_simple_poll_new();
1748
if(mc.simple_poll == NULL){
1749
fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");
1750
exitcode = EX_UNAVAILABLE;
1751
goto end;
1752
}
1753
1754
sigemptyset(&sigterm_action.sa_mask);
1755
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1756
if(ret == -1){
1757
perror_plus("sigaddset");
1758
exitcode = EX_OSERR;
1759
goto end;
1760
}
1761
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1762
if(ret == -1){
1763
perror_plus("sigaddset");
1764
exitcode = EX_OSERR;
1765
goto end;
1766
}
1767
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1768
if(ret == -1){
1769
perror_plus("sigaddset");
1770
exitcode = EX_OSERR;
1771
goto end;
1772
}
1773
/* Need to check if the handler is SIG_IGN before handling:
1774
| [[info:libc:Initial Signal Actions]] |
1775
| [[info:libc:Basic Signal Handling]] |
1776
*/
1777
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1778
if(ret == -1){
1779
perror_plus("sigaction");
1780
return EX_OSERR;
1781
}
1782
if(old_sigterm_action.sa_handler != SIG_IGN){
1783
ret = sigaction(SIGINT, &sigterm_action, NULL);
1784
if(ret == -1){
1785
perror_plus("sigaction");
1786
exitcode = EX_OSERR;
1787
goto end;
1788
}
1789
}
1790
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1791
if(ret == -1){
1792
perror_plus("sigaction");
1793
return EX_OSERR;
1794
}
1795
if(old_sigterm_action.sa_handler != SIG_IGN){
1796
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1797
if(ret == -1){
1798
perror_plus("sigaction");
1799
exitcode = EX_OSERR;
1800
goto end;
1801
}
1802
}
1803
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1804
if(ret == -1){
1805
perror_plus("sigaction");
1806
return EX_OSERR;
1807
}
1808
if(old_sigterm_action.sa_handler != SIG_IGN){
1809
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1810
if(ret == -1){
1811
perror_plus("sigaction");
1812
exitcode = EX_OSERR;
1813
goto end;
1814
}
1815
}
1816
1817
995
/* If the interface is down, bring it up */
1818
if(strcmp(interface, "none") != 0){
1819
if_index = (AvahiIfIndex) if_nametoindex(interface);
1820
if(if_index == 0){
1821
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1830
/* Re-raise priviliges */
1831
errno = 0;
1832
ret = seteuid(0);
1833
if(ret == -1){
1834
perror_plus("seteuid");
1835
}
1836
996
if(interface[0] != '\0'){
1837
997
#ifdef __linux__
1838
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1839
messages about the network interface to mess up the prompt */
999
messages to mess up the prompt */
1840
1000
ret = klogctl(8, NULL, 5);
1841
1001
bool restore_loglevel = true;
1842
1002
if(ret == -1){
1843
1003
restore_loglevel = false;
1844
perror_plus("klogctl");
1004
perror("klogctl");
1845
1005
}
1846
#endif /* __linux__ */
1006
#endif
1847
1007
1848
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
1009
if(sd < 0){
1850
perror_plus("socket");
1851
exitcode = EX_OSERR;
1010
perror("socket");
1011
exitcode = EXIT_FAILURE;
1852
1012
#ifdef __linux__
1853
1013
if(restore_loglevel){
1854
1014
ret = klogctl(7, NULL, 0);
1855
1015
if(ret == -1){
1856
perror_plus("klogctl");
1016
perror("klogctl");
1857
1017
}
1858
1018
}
1859
#endif /* __linux__ */
1860
/* Lower privileges */
1861
errno = 0;
1862
ret = seteuid(uid);
1863
if(ret == -1){
1864
perror_plus("seteuid");
1865
}
1019
#endif
1866
1020
goto end;
1867
1021
}
1868
1022
strcpy(network.ifr_name, interface);
1869
1023
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1870
1024
if(ret == -1){
1871
perror_plus("ioctl SIOCGIFFLAGS");
1025
perror("ioctl SIOCGIFFLAGS");
1872
1026
#ifdef __linux__
1873
1027
if(restore_loglevel){
1874
1028
ret = klogctl(7, NULL, 0);
1875
1029
if(ret == -1){
1876
perror_plus("klogctl");
1030
perror("klogctl");
1877
1031
}
1878
1032
}
1879
#endif /* __linux__ */
1880
exitcode = EX_OSERR;
1881
/* Lower privileges */
1882
errno = 0;
1883
ret = seteuid(uid);
1884
if(ret == -1){
1885
perror_plus("seteuid");
1886
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1887
1035
goto end;
1888
1036
}
1889
1037
if((network.ifr_flags & IFF_UP) == 0){
1890
1038
network.ifr_flags |= IFF_UP;
1891
take_down_interface = true;
1892
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1893
1040
if(ret == -1){
1894
take_down_interface = false;
1895
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1896
exitcode = EX_OSERR;
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1897
1043
#ifdef __linux__
1898
1044
if(restore_loglevel){
1899
1045
ret = klogctl(7, NULL, 0);
1900
1046
if(ret == -1){
1901
perror_plus("klogctl");
1047
perror("klogctl");
1902
1048
}
1903
1049
}
1904
#endif /* __linux__ */
1905
/* Lower privileges */
1906
errno = 0;
1907
ret = seteuid(uid);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1050
#endif
1911
1051
goto end;
1912
1052
}
1913
1053
}
1914
/* Sleep checking until interface is running.
1915
Check every 0.25s, up to total time of delay */
1054
/* sleep checking until interface is running */
1916
1055
for(int i=0; i < delay * 4; i++){
1917
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
1057
if(ret == -1){
1919
perror_plus("ioctl SIOCGIFFLAGS");
1058
perror("ioctl SIOCGIFFLAGS");
1920
1059
} else if(network.ifr_flags & IFF_RUNNING){
1921
1060
break;
1922
1061
}
1923
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
1063
ret = nanosleep(&sleeptime, NULL);
1925
1064
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1065
perror("nanosleep");
1927
1066
}
1928
1067
}
1929
if(not take_down_interface){
1930
/* We won't need the socket anymore */
1931
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1932
if(ret == -1){
1933
perror_plus("close");
1934
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1935
1071
}
1936
1072
#ifdef __linux__
1937
1073
if(restore_loglevel){
1938
1074
/* Restores kernel loglevel to default */
1939
1075
ret = klogctl(7, NULL, 0);
1940
1076
if(ret == -1){
1941
perror_plus("klogctl");
1942
}
1943
}
1944
#endif /* __linux__ */
1945
/* Lower privileges */
1946
errno = 0;
1947
if(take_down_interface){
1948
/* Lower privileges */
1949
ret = seteuid(uid);
1950
if(ret == -1){
1951
perror_plus("seteuid");
1952
}
1953
} else {
1954
/* Lower privileges permanently */
1955
ret = setuid(uid);
1956
if(ret == -1){
1957
perror_plus("setuid");
1958
}
1959
}
1960
}
1961
1962
if(quit_now){
1963
goto end;
1964
}
1965
1966
ret = init_gnutls_global(pubkey, seckey);
1967
if(ret == -1){
1968
fprintf_plus(stderr, "init_gnutls_global failed\n");
1969
exitcode = EX_UNAVAILABLE;
1077
perror("klogctl");
1078
}
1079
}
1080
#endif
1081
}
1082
1083
uid = getuid();
1084
gid = getgid();
1085
1086
errno = 0;
1087
setgid(gid);
1088
if(ret == -1){
1089
perror("setgid");
1090
}
1091
1092
ret = setuid(uid);
1093
if(ret == -1){
1094
perror("setuid");
1095
}
1096
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1098
if(ret == -1){
1099
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
1970
1101
goto end;
1971
1102
} else {
1972
1103
gnutls_initialized = true;
1973
1104
}
1974
1105
1975
if(quit_now){
1976
goto end;
1977
}
1978
1979
1106
if(mkdtemp(tempdir) == NULL){
1980
perror_plus("mkdtemp");
1107
perror("mkdtemp");
1981
1108
goto end;
1982
1109
}
1983
1110
tempdir_created = true;
1984
1111
1985
if(quit_now){
1986
goto end;
1987
}
1988
1989
if(not init_gpgme(pubkey, seckey, tempdir)){
1990
fprintf_plus(stderr, "init_gpgme failed\n");
1991
exitcode = EX_UNAVAILABLE;
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
1992
1115
goto end;
1993
1116
} else {
1994
1117
gpgme_initialized = true;
1995
1118
}
1996
1119
1997
if(quit_now){
1998
goto end;
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1122
if(if_index == 0){
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1999
1127
}
2000
1128
2001
1129
if(connect_to != NULL){
2003
1131
/* (Mainly meant for debugging) */
2004
1132
char *address = strrchr(connect_to, ':');
2005
1133
if(address == NULL){
2006
fprintf_plus(stderr, "No colon in address\n");
2007
exitcode = EX_USAGE;
2008
goto end;
2009
}
2010
2011
if(quit_now){
2012
goto end;
2013
}
2014
1134
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
2015
1138
uint16_t port;
2016
errno = 0;
2017
tmpmax = strtoimax(address+1, &tmp, 10);
2018
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2019
or tmpmax != (uint16_t)tmpmax){
2020
fprintf_plus(stderr, "Bad port number\n");
2021
exitcode = EX_USAGE;
2022
goto end;
2023
}
2024
2025
if(quit_now){
2026
goto end;
2027
}
2028
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1142
fprintf(stderr, "Bad port number\n");
1143
exitcode = EXIT_FAILURE;
1144
goto end;
1145
}
2029
1146
port = (uint16_t)tmpmax;
2030
1147
*address = '\0';
1148
address = connect_to;
2031
1149
/* Colon in address indicates IPv6 */
2032
1150
int af;
2033
if(strchr(connect_to, ':') != NULL){
1151
if(strchr(address, ':') != NULL){
2034
1152
af = AF_INET6;
2035
/* Accept [] around IPv6 address - see RFC 5952 */
2036
if(connect_to[0] == '[' and address[-1] == ']')
2037
{
2038
connect_to++;
2039
address[-1] = '\0';
2040
}
2041
1153
} else {
2042
1154
af = AF_INET;
2043
1155
}
2044
address = connect_to;
2045
2046
if(quit_now){
2047
goto end;
2048
}
2049
2050
while(not quit_now){
2051
ret = start_mandos_communication(address, port, if_index, af);
2052
if(quit_now or ret == 0){
2053
break;
2054
}
2055
if(debug){
2056
fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);
2057
}
2058
sleep((int)retry_interval);
2059
}
2060
2061
if (not quit_now){
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1158
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1160
} else {
2062
1161
exitcode = EXIT_SUCCESS;
2063
1162
}
2064
2065
1163
goto end;
2066
1164
}
2067
1165
2068
if(quit_now){
1166
if(not debug){
1167
avahi_set_log_function(empty_log);
1168
}
1169
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1172
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
2069
1178
goto end;
2070
1179
}
2071
1180
2089
1198
2090
1199
/* Check if creating the Avahi server object succeeded */
2091
1200
if(mc.server == NULL){
2092
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
2093
1202
avahi_strerror(error));
2094
exitcode = EX_UNAVAILABLE;
2095
goto end;
2096
}
2097
2098
if(quit_now){
1203
exitcode = EXIT_FAILURE;
2099
1204
goto end;
2100
1205
}
2101
1206
2102
1207
/* Create the Avahi service browser */
2103
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
2104
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2105
NULL, 0, browse_callback, NULL);
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
2106
1211
if(sb == NULL){
2107
fprintf_plus(stderr, "Failed to create service browser: %s\n",
1212
fprintf(stderr, "Failed to create service browser: %s\n",
2108
1213
avahi_strerror(avahi_server_errno(mc.server)));
2109
exitcode = EX_UNAVAILABLE;
2110
goto end;
2111
}
2112
2113
if(quit_now){
1214
exitcode = EXIT_FAILURE;
2114
1215
goto end;
2115
1216
}
2116
1217
2117
1218
/* Run the main loop */
2118
1219
2119
1220
if(debug){
2120
fprintf_plus(stderr, "Starting Avahi loop search\n");
2121
}
2122
2123
ret = avahi_loop_with_timeout(mc.simple_poll,
2124
(int)(retry_interval * 1000));
2125
if(debug){
2126
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2127
(ret == 0) ? "successfully" : "with error");
2128
}
1221
fprintf(stderr, "Starting Avahi loop search\n");
1222
}
1223
1224
avahi_simple_poll_loop(mc.simple_poll);
2129
1225
2130
1226
end:
2131
1227
2132
1228
if(debug){
2133
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1229
fprintf(stderr, "%s exiting\n", argv[0]);
2134
1230
}
2135
1231
2136
1232
/* Cleanup things */
2152
1248
if(gpgme_initialized){
2153
1249
gpgme_release(mc.ctx);
2154
1250
}
2155
2156
/* Cleans up the circular linked list of Mandos servers the client
2157
has seen */
2158
if(mc.current_server != NULL){
2159
mc.current_server->prev->next = NULL;
2160
while(mc.current_server != NULL){
2161
server *next = mc.current_server->next;
2162
free(mc.current_server);
2163
mc.current_server = next;
2164
}
2165
}
2166
2167
/* XXX run network hooks "stop" here */
2168
2169
/* Take down the network interface */
2170
if(take_down_interface){
2171
/* Re-raise priviliges */
2172
errno = 0;
2173
ret = seteuid(0);
2174
if(ret == -1){
2175
perror_plus("seteuid");
2176
}
2177
if(geteuid() == 0){
2178
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2179
if(ret == -1){
2180
perror_plus("ioctl SIOCGIFFLAGS");
2181
} else if(network.ifr_flags & IFF_UP){
2182
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2183
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2184
if(ret == -1){
2185
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2186
}
2187
}
2188
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2189
if(ret == -1){
2190
perror_plus("close");
2191
}
2192
/* Lower privileges permanently */
2193
errno = 0;
2194
ret = setuid(uid);
2195
if(ret == -1){
2196
perror_plus("setuid");
2197
}
2198
}
2199
}
2200
2201
/* Removes the GPGME temp directory and all files inside */
1251
1252
/* Removes the temp directory used by GPGME */
2202
1253
if(tempdir_created){
2203
struct dirent **direntries = NULL;
2204
struct dirent *direntry = NULL;
2205
int numentries = scandir(tempdir, &direntries, notdotentries,
2206
alphasort);
2207
if (numentries > 0){
2208
for(int i = 0; i < numentries; i++){
2209
direntry = direntries[i];
1254
DIR *d;
1255
struct dirent *direntry;
1256
d = opendir(tempdir);
1257
if(d == NULL){
1258
if(errno != ENOENT){
1259
perror("opendir");
1260
}
1261
} else {
1262
while(true){
1263
direntry = readdir(d);
1264
if(direntry == NULL){
1265
break;
1266
}
1267
/* Skip "." and ".." */
1268
if(direntry->d_name[0] == '.'
1269
and (direntry->d_name[1] == '\0'
1270
or (direntry->d_name[1] == '.'
1271
and direntry->d_name[2] == '\0'))){
1272
continue;
1273
}
2210
1274
char *fullname = NULL;
2211
1275
ret = asprintf(&fullname, "%s/%s", tempdir,
2212
1276
direntry->d_name);
2213
1277
if(ret < 0){
2214
perror_plus("asprintf");
1278
perror("asprintf");
2215
1279
continue;
2216
1280
}
2217
1281
ret = remove(fullname);
2218
1282
if(ret == -1){
2219
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1284
strerror(errno));
2220
1285
}
2221
1286
free(fullname);
2222
1287
}
2223
}
2224
2225
/* need to clean even if 0 because man page doesn't specify */
2226
free(direntries);
2227
if (numentries == -1){
2228
perror_plus("scandir");
1288
closedir(d);
2229
1289
}
2230
1290
ret = rmdir(tempdir);
2231
1291
if(ret == -1 and errno != ENOENT){
2232
perror_plus("rmdir");
2233
}
2234
}
2235
2236
if(quit_now){
2237
sigemptyset(&old_sigterm_action.sa_mask);
2238
old_sigterm_action.sa_handler = SIG_DFL;
2239
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2240
&old_sigterm_action,
2241
NULL));
2242
if(ret == -1){
2243
perror_plus("sigaction");
2244
}
2245
do {
2246
ret = raise(signal_received);
2247
} while(ret != 0 and errno == EINTR);
2248
if(ret != 0){
2249
perror_plus("raise");
2250
abort();
2251
}
2252
TEMP_FAILURE_RETRY(pause());
1292
perror("rmdir");
1293
}
2253
1294
}
2254
1295
2255
1296
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0