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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
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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 /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
stdout, ferror(), sscanf(),
40
remove() */
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
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
55
inet_pton(), connect() */
56
#include <fcntl.h> /* open() */
61
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
58
*/
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() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
60
#include <assert.h> /* assert() */
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(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
79
73
#include <iso646.h> /* not, or, and */
80
74
#include <argp.h> /* struct argp_option, error_t, struct
81
75
argp_state, struct argp,
82
76
argp_parse(), ARGP_KEY_ARG,
83
77
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
78
#ifdef __linux__
100
79
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
80
#endif
102
81
103
82
/* Avahi */
104
83
/* All Avahi types, constants and functions
118
97
init_gnutls_session(),
119
98
GNUTLS_* */
120
99
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
123
102
124
103
/* GPGME */
125
104
#include <gpgme.h> /* All GPGME types, constants and
133
112
#define PATHDIR "/conf/conf.d/mandos"
134
113
#define SECKEY "seckey.txt"
135
114
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
115
138
116
bool debug = false;
139
117
static const char mandos_protocol_version[] = "1";
140
118
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;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
120
160
121
/* Used for passing in values through the Avahi callback functions */
161
122
typedef struct {
123
AvahiSimplePoll *simple_poll;
162
124
AvahiServer *server;
163
125
gnutls_certificate_credentials_t cred;
164
126
unsigned int dh_bits;
165
127
gnutls_dh_params_t dh_params;
166
128
const char *priority;
167
129
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
130
} mandos_context;
172
131
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
198
132
/*
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* 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,
201
135
* "buffer_length" is how much is already used.
202
136
*/
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
206
139
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;
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
141
if(buffer == NULL){
213
142
return 0;
214
143
}
215
*buffer = new_buf;
216
144
buffer_capacity += BUFFER_SIZE;
217
145
}
218
146
return buffer_capacity;
219
147
}
220
148
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
269
149
/*
270
150
* Initialize GPGME.
271
151
*/
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){
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
277
155
gpgme_error_t rc;
278
156
gpgme_engine_info_t engine_info;
279
157
158
280
159
/*
281
160
* Helper function to insert pub and seckey to the engine keyring.
282
161
*/
283
bool import_key(const char * const filename){
284
int ret;
162
bool import_key(const char *filename){
285
163
int fd;
286
164
gpgme_data_t pgp_data;
287
165
288
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
167
if(fd == -1){
290
perror_plus("open");
168
perror("open");
291
169
return false;
292
170
}
293
171
294
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
173
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));
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
298
176
return false;
299
177
}
300
178
301
179
rc = gpgme_op_import(mc->ctx, pgp_data);
302
180
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
305
183
return false;
306
184
}
307
185
308
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
187
if(ret == -1){
310
perror_plus("close");
188
perror("close");
311
189
}
312
190
gpgme_data_release(pgp_data);
313
191
return true;
314
192
}
315
193
316
194
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
318
196
}
319
197
320
198
/* Init GPGME */
321
199
gpgme_check_version(NULL);
322
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
201
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));
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
326
204
return false;
327
205
}
328
206
329
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
330
208
rc = gpgme_get_engine_info(&engine_info);
331
209
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));
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
334
212
return false;
335
213
}
336
214
while(engine_info != NULL){
342
220
engine_info = engine_info->next;
343
221
}
344
222
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
224
return false;
348
225
}
349
226
350
227
/* Create new GPGME "context" */
351
228
rc = gpgme_new(&(mc->ctx));
352
229
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));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
356
232
return false;
357
233
}
358
234
360
236
return false;
361
237
}
362
238
363
return true;
239
return true;
364
240
}
365
241
366
242
/*
367
243
* Decrypt OpenPGP data.
368
244
* Returns -1 on error
369
245
*/
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
372
248
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
249
char **plaintext){
375
250
gpgme_data_t dh_crypto, dh_plain;
376
251
gpgme_error_t rc;
377
252
ssize_t ret;
379
254
ssize_t plaintext_length = 0;
380
255
381
256
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
258
}
384
259
385
260
/* Create new GPGME data buffer from memory cryptotext */
386
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
262
0);
388
263
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));
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
391
266
return -1;
392
267
}
393
268
394
269
/* Create new empty GPGME data buffer for the plaintext */
395
270
rc = gpgme_data_new(&dh_plain);
396
271
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));
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
400
274
gpgme_data_release(dh_crypto);
401
275
return -1;
402
276
}
405
279
data buffer */
406
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
281
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
410
284
plaintext_length = -1;
411
285
if(debug){
412
286
gpgme_decrypt_result_t result;
413
287
result = gpgme_op_decrypt_result(mc->ctx);
414
288
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
290
} 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);
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
421
295
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
423
297
}
424
298
gpgme_recipient_t recipient;
425
299
recipient = result->recipients;
426
while(recipient != NULL){
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");
434
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
}
435
310
}
436
311
}
437
312
}
439
314
}
440
315
441
316
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
318
}
444
319
445
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
448
323
plaintext_length = -1;
449
324
goto decrypt_end;
450
325
}
451
326
452
327
*plaintext = NULL;
453
328
while(true){
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
457
332
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
461
336
}
462
337
463
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
468
343
break;
469
344
}
470
345
if(ret < 0){
471
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
472
347
plaintext_length = -1;
473
348
goto decrypt_end;
474
349
}
476
351
}
477
352
478
353
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
480
355
for(ssize_t i = 0; i < plaintext_length; i++){
481
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
357
}
493
368
return plaintext_length;
494
369
}
495
370
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);
371
static const char * safer_gnutls_strerror(int value){
372
const char *ret = gnutls_strerror(value); /* Spurious warning from
373
-Wunreachable-code */
374
if(ret == NULL)
375
ret = "(unknown)";
376
return ret;
507
377
}
508
378
509
379
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
380
static void debuggnutls(__attribute__((unused)) int level,
512
381
const char* string){
513
fprintf_plus(stderr, "GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
514
383
}
515
384
516
__attribute__((nonnull, warn_unused_result))
517
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
mandos_context *mc){
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
387
const char *seckeyfilename){
520
388
int ret;
521
unsigned int uret;
522
389
523
390
if(debug){
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
525
392
}
526
393
527
394
ret = gnutls_global_init();
528
395
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
531
398
return -1;
532
399
}
533
400
540
407
}
541
408
542
409
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
544
411
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
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));
547
417
gnutls_global_deinit();
548
418
return -1;
549
419
}
550
420
551
421
if(debug){
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
554
pubkeyfilename,
555
seckeyfilename);
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
556
425
}
557
426
558
427
ret = gnutls_certificate_set_openpgp_key_file
559
428
(mc->cred, pubkeyfilename, seckeyfilename,
560
429
GNUTLS_OPENPGP_FMT_BASE64);
561
430
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));
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));
567
436
goto globalfail;
568
437
}
569
438
570
439
/* GnuTLS server initialization */
571
440
ret = gnutls_dh_params_init(&mc->dh_params);
572
441
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
576
444
goto globalfail;
577
445
}
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
}
679
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
447
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));
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
683
450
goto globalfail;
684
451
}
685
452
695
462
return -1;
696
463
}
697
464
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
701
467
int ret;
702
468
/* GnuTLS session creation */
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);
469
ret = gnutls_init(session, GNUTLS_SERVER);
709
470
if(ret != GNUTLS_E_SUCCESS){
710
fprintf_plus(stderr,
711
"Error in GnuTLS session initialization: %s\n",
712
safer_gnutls_strerror(ret));
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
713
473
}
714
474
715
475
{
716
476
const char *err;
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);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
724
478
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));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
728
482
gnutls_deinit(*session);
729
483
return -1;
730
484
}
731
485
}
732
486
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);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
741
489
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
743
safer_gnutls_strerror(ret));
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
744
492
gnutls_deinit(*session);
745
493
return -1;
746
494
}
747
495
748
496
/* ignore client certificate if any. */
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
750
499
751
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
752
501
757
506
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
758
507
__attribute__((unused)) const char *txt){}
759
508
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
977
509
/* Called when a Mandos server is found */
978
__attribute__((nonnull, warn_unused_result))
979
static int start_mandos_communication(const char *ip, in_port_t port,
510
static int start_mandos_communication(const char *ip, uint16_t port,
980
511
AvahiIfIndex if_index,
981
int af, mandos_context *mc){
982
int ret, tcp_sd = -1;
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
983
514
ssize_t sret;
984
struct sockaddr_storage to;
515
union {
516
struct sockaddr_in in;
517
struct sockaddr_in6 in6;
518
} to;
985
519
char *buffer = NULL;
986
char *decrypted_buffer = NULL;
520
char *decrypted_buffer;
987
521
size_t buffer_length = 0;
988
522
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
989
524
size_t written;
990
int retval = -1;
525
int retval = 0;
991
526
gnutls_session_t session;
992
527
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
528
1002
529
switch(af){
1003
530
case AF_INET6:
1007
534
pf = PF_INET;
1008
535
break;
1009
536
default:
1010
fprintf_plus(stderr, "Bad address family: %d\n", af);
1011
errno = EINVAL;
537
fprintf(stderr, "Bad address family: %d\n", af);
1012
538
return -1;
1013
539
}
1014
540
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
}
1043
return -1;
1044
}
1045
}
1046
1047
ret = init_gnutls_session(&session, mc);
541
ret = init_gnutls_session(mc, &session);
1048
542
if(ret != 0){
1049
543
return -1;
1050
544
}
1051
545
1052
546
if(debug){
1053
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1054
PRIuMAX "\n", ip, (uintmax_t)port);
547
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
548
"\n", ip, port);
1055
549
}
1056
550
1057
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
551
tcp_sd = socket(pf, SOCK_STREAM, 0);
1058
552
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;
553
perror("socket");
554
return -1;
1068
555
}
1069
556
1070
557
memset(&to, 0, sizeof(to));
1071
558
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);
559
to.in6.sin6_family = (uint16_t)af;
560
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1074
561
} 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);
562
to.in.sin_family = (sa_family_t)af;
563
ret = inet_pton(af, ip, &to.in.sin_addr);
1077
564
}
1078
565
if(ret < 0 ){
1079
int e = errno;
1080
perror_plus("inet_pton");
1081
errno = e;
1082
goto mandos_end;
566
perror("inet_pton");
567
return -1;
1083
568
}
1084
569
if(ret == 0){
1085
int e = errno;
1086
fprintf_plus(stderr, "Bad address: %s\n", ip);
1087
errno = e;
1088
goto mandos_end;
570
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
1089
572
}
1090
573
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)){
574
to.in6.sin6_port = htons(port); /* Spurious warnings from
575
-Wconversion and
576
-Wunreachable-code */
577
578
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
579
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
580
-Wunreachable-code*/
1094
581
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;
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
" without a network interface\n");
584
return -1;
1099
585
}
1100
586
/* Set the network interface number as scope */
1101
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
587
to.in6.sin6_scope_id = (uint32_t)if_index;
1102
588
}
1103
589
} else {
1104
((struct sockaddr_in *)&to)->sin_port = htons(port);
1105
}
1106
1107
if(quit_now){
1108
errno = EINTR;
1109
goto mandos_end;
590
to.in.sin_port = htons(port); /* Spurious warnings from
591
-Wconversion and
592
-Wunreachable-code */
1110
593
}
1111
594
1112
595
if(debug){
1113
596
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1114
597
char interface[IF_NAMESIZE];
1115
598
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1116
perror_plus("if_indextoname");
599
perror("if_indextoname");
1117
600
} else {
1118
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1119
"\n", ip, interface, (uintmax_t)port);
601
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
602
ip, interface, port);
1120
603
}
1121
604
} else {
1122
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1123
ip, (uintmax_t)port);
605
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
606
port);
1124
607
}
1125
608
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1126
609
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;
610
const char *pcret;
611
if(af == AF_INET6){
612
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
613
sizeof(addrstr));
614
} else {
615
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
616
sizeof(addrstr));
617
}
618
if(pcret == NULL){
619
perror("inet_ntop");
620
} else {
621
if(strcmp(addrstr, ip) != 0){
622
fprintf(stderr, "Canonical address form: %s\n", addrstr);
623
}
624
}
625
}
626
627
if(af == AF_INET6){
628
ret = connect(tcp_sd, &to.in6, sizeof(to));
629
} else {
630
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
631
}
632
if(ret < 0){
633
perror("connect");
634
return -1;
1207
635
}
1208
636
1209
637
const char *out = mandos_protocol_version;
1211
639
while(true){
1212
640
size_t out_size = strlen(out);
1213
641
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1214
out_size - written));
642
out_size - written));
1215
643
if(ret == -1){
1216
int e = errno;
1217
perror_plus("write");
1218
errno = e;
644
perror("write");
645
retval = -1;
1219
646
goto mandos_end;
1220
647
}
1221
648
written += (size_t)ret;
1229
656
break;
1230
657
}
1231
658
}
1232
1233
if(quit_now){
1234
errno = EINTR;
1235
goto mandos_end;
1236
}
1237
659
}
1238
660
1239
661
if(debug){
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 {
662
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
}
664
665
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
666
667
do{
1260
668
ret = gnutls_handshake(session);
1261
if(quit_now){
1262
errno = EINTR;
1263
goto mandos_end;
1264
}
1265
669
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1266
670
1267
671
if(ret != GNUTLS_E_SUCCESS){
1268
672
if(debug){
1269
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1270
674
gnutls_perror(ret);
1271
675
}
1272
errno = EPROTO;
676
retval = -1;
1273
677
goto mandos_end;
1274
678
}
1275
679
1276
680
/* Read OpenPGP packet that contains the wanted password */
1277
681
1278
682
if(debug){
1279
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1280
" %s\n", ip);
683
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
684
ip);
1281
685
}
1282
686
1283
687
while(true){
1284
1285
if(quit_now){
1286
errno = EINTR;
1287
goto mandos_end;
1288
}
1289
1290
buffer_capacity = incbuffer(&buffer, buffer_length,
1291
buffer_capacity);
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
689
buffer_capacity);
1292
690
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;
691
perror("adjustbuffer");
692
retval = -1;
1301
693
goto mandos_end;
1302
694
}
1303
695
1312
704
case GNUTLS_E_AGAIN:
1313
705
break;
1314
706
case GNUTLS_E_REHANDSHAKE:
1315
do {
707
do{
1316
708
ret = gnutls_handshake(session);
1317
1318
if(quit_now){
1319
errno = EINTR;
1320
goto mandos_end;
1321
}
1322
709
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1323
710
if(ret < 0){
1324
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1325
"***\n");
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1326
712
gnutls_perror(ret);
1327
errno = EPROTO;
713
retval = -1;
1328
714
goto mandos_end;
1329
715
}
1330
716
break;
1331
717
default:
1332
fprintf_plus(stderr, "Unknown error while reading data from"
1333
" encrypted session with Mandos server\n");
718
fprintf(stderr, "Unknown error while reading data from"
719
" encrypted session with Mandos server\n");
720
retval = -1;
1334
721
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1335
errno = EIO;
1336
722
goto mandos_end;
1337
723
}
1338
724
} else {
1341
727
}
1342
728
1343
729
if(debug){
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);
730
fprintf(stderr, "Closing TLS session\n");
731
}
732
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1359
734
1360
735
if(buffer_length > 0){
1361
ssize_t decrypted_buffer_size;
1362
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1363
&decrypted_buffer, mc);
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
737
buffer_length,
738
&decrypted_buffer);
1364
739
if(decrypted_buffer_size >= 0){
1365
1366
740
written = 0;
1367
741
while(written < (size_t) decrypted_buffer_size){
1368
if(quit_now){
1369
errno = EINTR;
1370
goto mandos_end;
1371
}
1372
1373
742
ret = (int)fwrite(decrypted_buffer + written, 1,
1374
743
(size_t)decrypted_buffer_size - written,
1375
744
stdout);
1376
745
if(ret == 0 and ferror(stdout)){
1377
int e = errno;
1378
746
if(debug){
1379
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1380
strerror(errno));
747
fprintf(stderr, "Error writing encrypted data: %s\n",
748
strerror(errno));
1381
749
}
1382
errno = e;
1383
goto mandos_end;
750
retval = -1;
751
break;
1384
752
}
1385
753
written += (size_t)ret;
1386
754
}
1387
retval = 0;
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
1388
758
}
759
} else {
760
retval = -1;
1389
761
}
1390
762
1391
763
/* Shutdown procedure */
1392
764
1393
765
mandos_end:
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
}
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
1419
770
}
771
gnutls_deinit(session);
1420
772
return retval;
1421
773
}
1422
774
1423
__attribute__((nonnull))
1424
775
static void resolve_callback(AvahiSServiceResolver *r,
1425
776
AvahiIfIndex interface,
1426
777
AvahiProtocol proto,
1434
785
AVAHI_GCC_UNUSED AvahiStringList *txt,
1435
786
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1436
787
flags,
1437
void *mc){
1438
if(r == NULL){
1439
return;
1440
}
788
void* userdata){
789
mandos_context *mc = userdata;
790
assert(r);
1441
791
1442
792
/* Called whenever a service has been resolved successfully or
1443
793
timed out */
1444
794
1445
if(quit_now){
1446
avahi_s_service_resolver_free(r);
1447
return;
1448
}
1449
1450
795
switch(event){
1451
796
default:
1452
797
case AVAHI_RESOLVER_FAILURE:
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)));
798
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
1458
801
break;
1459
802
1460
803
case AVAHI_RESOLVER_FOUND:
1462
805
char ip[AVAHI_ADDRESS_STR_MAX];
1463
806
avahi_address_snprint(ip, sizeof(ip), address);
1464
807
if(debug){
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);
808
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
ip, (intmax_t)interface, port);
1468
811
}
1469
int ret = start_mandos_communication(ip, (in_port_t)port,
1470
interface,
1471
avahi_proto_to_af(proto),
1472
mc);
812
int ret = start_mandos_communication(ip, port, interface, mc,
813
avahi_proto_to_af(proto));
1473
814
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
}
815
avahi_simple_poll_quit(mc->simple_poll);
1482
816
}
1483
817
}
1484
818
}
1494
828
const char *domain,
1495
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1496
830
flags,
1497
void *mc){
1498
if(b == NULL){
1499
return;
1500
}
831
void* userdata){
832
mandos_context *mc = userdata;
833
assert(b);
1501
834
1502
835
/* Called whenever a new services becomes available on the LAN or
1503
836
is removed from the LAN */
1504
837
1505
if(quit_now){
1506
return;
1507
}
1508
1509
838
switch(event){
1510
839
default:
1511
840
case AVAHI_BROWSER_FAILURE:
1512
841
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);
842
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
1517
845
return;
1518
846
1519
847
case AVAHI_BROWSER_NEW:
1522
850
the callback function is called the Avahi server will free the
1523
851
resolver for us. */
1524
852
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)));
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)));
1533
859
break;
1534
860
1535
861
case AVAHI_BROWSER_REMOVE:
1538
864
case AVAHI_BROWSER_ALL_FOR_NOW:
1539
865
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1540
866
if(debug){
1541
fprintf_plus(stderr, "No Mandos server found, still"
1542
" searching...\n");
867
fprintf(stderr, "No Mandos server found, still searching...\n");
1543
868
}
1544
869
break;
1545
870
}
1546
871
}
1547
872
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
}
2223
2224
873
int main(int argc, char *argv[]){
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
874
AvahiSServiceBrowser *sb = NULL;
2230
error_t ret_errno;
875
int error;
2231
876
int ret;
2232
877
intmax_t tmpmax;
2233
char *tmp;
878
int numchars;
2234
879
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;
880
const char *interface = "eth0";
881
struct ifreq network;
882
int sd;
883
uid_t uid;
884
gid_t gid;
885
char *connect_to = NULL;
886
char tempdir[] = "/tmp/mandosXXXXXX";
887
bool tempdir_created = false;
2240
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
889
const char *seckey = PATHDIR "/" SECKEY;
2242
890
const char *pubkey = PATHDIR "/" PUBKEY;
2243
char *interfaces_hooks = NULL;
2244
891
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
2245
895
bool gnutls_initialized = false;
2246
896
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
}
897
double delay = 2.5;
2274
898
2275
899
{
2276
900
struct argp_option options[] = {
2306
930
.arg = "SECONDS",
2307
931
.doc = "Maximum delay to wait for interface startup",
2308
932
.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
933
{ .name = NULL }
2327
934
};
2328
935
2329
936
error_t parse_opt(int key, char *arg,
2330
937
struct argp_state *state){
2331
errno = 0;
2332
938
switch(key){
2333
939
case 128: /* --debug */
2334
940
debug = true;
2337
943
connect_to = arg;
2338
944
break;
2339
945
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
}
946
interface = arg;
2345
947
break;
2346
948
case 's': /* --seckey */
2347
949
seckey = arg;
2350
952
pubkey = arg;
2351
953
break;
2352
954
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");
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);
2358
960
}
2359
961
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2360
962
break;
2362
964
mc.priority = arg;
2363
965
break;
2364
966
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);
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:
2395
976
break;
2396
977
default:
2397
978
return ARGP_ERR_UNKNOWN;
2398
979
}
2399
return errno;
980
return 0;
2400
981
}
2401
982
2402
983
struct argp argp = { .options = options, .parser = parse_opt,
2403
984
.args_doc = "",
2404
985
.doc = "Mandos client -- Get and decrypt"
2405
986
" 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;
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");
990
exitcode = EXIT_FAILURE;
2419
991
goto end;
2420
992
}
2421
993
}
2422
994
2423
{
2424
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
995
/* If the interface is down, bring it up */
996
if(interface[0] != '\0'){
997
#ifdef __linux__
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
messages to mess up the prompt */
1000
ret = klogctl(8, NULL, 5);
1001
bool restore_loglevel = true;
1002
if(ret == -1){
1003
restore_loglevel = false;
1004
perror("klogctl");
1005
}
1006
#endif
2426
1007
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");
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1009
if(sd < 0){
1010
perror("socket");
1011
exitcode = EXIT_FAILURE;
1012
#ifdef __linux__
1013
if(restore_loglevel){
1014
ret = klogctl(7, NULL, 0);
1015
if(ret == -1){
1016
perror("klogctl");
1017
}
1018
}
1019
#endif
1020
goto end;
1021
}
1022
strcpy(network.ifr_name, interface);
1023
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1024
if(ret == -1){
1025
perror("ioctl SIOCGIFFLAGS");
1026
#ifdef __linux__
1027
if(restore_loglevel){
1028
ret = klogctl(7, NULL, 0);
1029
if(ret == -1){
1030
perror("klogctl");
1031
}
1032
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1035
goto end;
1036
}
1037
if((network.ifr_flags & IFF_UP) == 0){
1038
network.ifr_flags |= IFF_UP;
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1040
if(ret == -1){
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1043
#ifdef __linux__
1044
if(restore_loglevel){
1045
ret = klogctl(7, NULL, 0);
1046
if(ret == -1){
1047
perror("klogctl");
1048
}
1049
}
1050
#endif
2509
1051
goto end;
2510
1052
}
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");
2626
exitcode = EXIT_FAILURE;
2627
goto end;
2628
}
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
}
1053
}
1054
/* sleep checking until interface is running */
1055
for(int i=0; i < delay * 4; i++){
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1057
if(ret == -1){
1058
perror("ioctl SIOCGIFFLAGS");
1059
} else if(network.ifr_flags & IFF_RUNNING){
2650
1060
break;
2651
1061
}
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;
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
1063
ret = nanosleep(&sleeptime, NULL);
1064
if(ret == -1 and errno != EINTR){
1065
perror("nanosleep");
1066
}
1067
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1071
}
1072
#ifdef __linux__
1073
if(restore_loglevel){
1074
/* Restores kernel loglevel to default */
1075
ret = klogctl(7, NULL, 0);
1076
if(ret == -1){
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;
2689
1101
goto end;
2690
1102
} else {
2691
1103
gnutls_initialized = true;
2692
1104
}
2693
1105
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;
1106
if(mkdtemp(tempdir) == NULL){
1107
perror("mkdtemp");
1108
goto end;
1109
}
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
2719
1115
goto end;
2720
1116
} else {
2721
1117
gpgme_initialized = true;
2722
1118
}
2723
1119
2724
if(quit_now){
2725
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
}
2726
1127
}
2727
1128
2728
1129
if(connect_to != NULL){
2729
1130
/* Connect directly, do not use Zeroconf */
2730
1131
/* (Mainly meant for debugging) */
2731
1132
char *address = strrchr(connect_to, ':');
2732
2733
1133
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;
1134
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1138
uint16_t port;
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
}
1146
port = (uint16_t)tmpmax;
2758
1147
*address = '\0';
1148
address = connect_to;
2759
1149
/* Colon in address indicates IPv6 */
2760
1150
int af;
2761
if(strchr(connect_to, ':') != NULL){
1151
if(strchr(address, ':') != NULL){
2762
1152
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
}
2769
1153
} else {
2770
1154
af = AF_INET;
2771
1155
}
2772
address = connect_to;
2773
2774
if(quit_now){
2775
goto end;
2776
}
2777
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){
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1158
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1160
} else {
2792
1161
exitcode = EXIT_SUCCESS;
2793
1162
}
2794
2795
1163
goto end;
2796
1164
}
2797
1165
2798
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;
2799
1178
goto end;
2800
1179
}
2801
1180
2809
1188
config.publish_domain = 0;
2810
1189
2811
1190
/* Allocate a new server */
2812
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
1191
mc.server = avahi_server_new(avahi_simple_poll_get
1192
(mc.simple_poll), &config, NULL,
1193
NULL, &error);
2814
1194
2815
1195
/* Free the Avahi configuration data */
2816
1196
avahi_server_config_free(&config);
2818
1198
2819
1199
/* Check if creating the Avahi server object succeeded */
2820
1200
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){
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
2828
1204
goto end;
2829
1205
}
2830
1206
2831
1207
/* Create the Avahi service browser */
2832
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
2833
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2834
NULL, 0, browse_callback,
2835
(void *)&mc);
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
2836
1211
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){
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1213
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
2844
1215
goto end;
2845
1216
}
2846
1217
2847
1218
/* Run the main loop */
2848
1219
2849
1220
if(debug){
2850
fprintf_plus(stderr, "Starting Avahi loop search\n");
1221
fprintf(stderr, "Starting Avahi loop search\n");
2851
1222
}
2852
1223
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
}
1224
avahi_simple_poll_loop(mc.simple_poll);
2859
1225
2860
1226
end:
2861
1227
2862
1228
if(debug){
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1229
fprintf(stderr, "%s exiting\n", argv[0]);
2864
1230
}
2865
1231
2866
1232
/* Cleanup things */
2867
free(mc.interfaces);
2868
2869
1233
if(sb != NULL)
2870
1234
avahi_s_service_browser_free(sb);
2871
1235
2872
1236
if(mc.server != NULL)
2873
1237
avahi_server_free(mc.server);
2874
1238
2875
if(simple_poll != NULL)
2876
avahi_simple_poll_free(simple_poll);
1239
if(mc.simple_poll != NULL)
1240
avahi_simple_poll_free(mc.simple_poll);
2877
1241
2878
1242
if(gnutls_initialized){
2879
1243
gnutls_certificate_free_credentials(mc.cred);
2885
1249
gpgme_release(mc.ctx);
2886
1250
}
2887
1251
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());
1252
/* Removes the temp directory used by GPGME */
1253
if(tempdir_created){
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
}
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", tempdir,
1276
direntry->d_name);
1277
if(ret < 0){
1278
perror("asprintf");
1279
continue;
1280
}
1281
ret = remove(fullname);
1282
if(ret == -1){
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1284
strerror(errno));
1285
}
1286
free(fullname);
1287
}
1288
closedir(d);
1289
}
1290
ret = rmdir(tempdir);
1291
if(ret == -1 and errno != ENOENT){
1292
perror("rmdir");
1293
}
3012
1294
}
3013
1295
3014
1296
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0