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- Committer: Björn Påhlsson
- Date: 2011-06-23 22:27:15 UTC
- mto: This revision was merged to the branch mainline in revision 485.
- Revision ID: belorn@fukt.bsnet.se-20110623222715-q5wro9ma9iyjl367
* Makefile (CFLAGS): Added "-lrt" to include real time library.
* plugins.d/mandos-client.c: use scandir(3) instead of readdir(3)
Prefix all debug output with "Mandos plugin " + program_invocation_short_name
Retry servers that failed to provide password.
New option --retry SECONDS that sets the interval between rechecking.
--retry also controls how often it retries a server when using --connect.
* plugins.d/splashy.c: Prefix all debug output with "Mandos plugin " + program_invocation_short_name
* plugins.d/usplash.c: --||--
* plugins.d/askpass-fifo.c: --||--
* plugins.d/password-prompt.c: --||--
* plugins.d/plymouth.c: --||--
* mandos: Lower logger level from warning to info on failed client requests because client was disabled or unknown fingerprint.
* plugins.d/plymouth.c (get_pid): bug fix. Was not calling free on direntries.
* plugins.d/mandos-client.c: use scandir(3) instead of readdir(3)
Prefix all debug output with "Mandos plugin " + program_invocation_short_name
Retry servers that failed to provide password.
New option --retry SECONDS that sets the interval between rechecking.
--retry also controls how often it retries a server when using --connect.
* plugins.d/splashy.c: Prefix all debug output with "Mandos plugin " + program_invocation_short_name
* plugins.d/usplash.c: --||--
* plugins.d/askpass-fifo.c: --||--
* plugins.d/password-prompt.c: --||--
* plugins.d/plymouth.c: --||--
* mandos: Lower logger level from warning to info on failed client requests because client was disabled or unknown fingerprint.
* plugins.d/plymouth.c (get_pid): bug fix. Was not calling free on direntries.
- files removed:
- debian/mandos-client.examples
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
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#include <stddef.h> /* NULL, size_t, ssize_t */
46
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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
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strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
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sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
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opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
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#include <dirent.h> /* opendir(), struct dirent, readdir()
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*/
63
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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strtoimax() */
65
#include <errno.h> /* perror(), errno,
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program_invocation_short_name */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno, program_invocation_short_name */
67
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#include <time.h> /* nanosleep(), time(), sleep() */
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
73
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*/
74
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
79
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#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
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argp_state, struct argp,
86
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raise() */
87
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
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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
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#ifdef __linux__
100
89
#include <sys/klog.h> /* klogctl() */
118
107
init_gnutls_session(),
119
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GNUTLS_* */
120
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#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
123
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113
/* GPGME */
125
114
#include <gpgme.h> /* All GPGME types, constants and
133
122
#define PATHDIR "/conf/conf.d/mandos"
134
123
#define SECKEY "seckey.txt"
135
124
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
125
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bool debug = false;
139
127
static const char mandos_protocol_version[] = "1";
140
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const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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static const char sys_class_net[] = "/sys/class/net";
143
131
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
132
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/* Doubly linked list that need to be circularly linked when used */
133
/* Doubly linked list that need to be circular linked when ever used */
150
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typedef struct server{
151
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const char *ip;
152
in_port_t port;
136
uint16_t port;
153
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AvahiIfIndex if_index;
154
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int af;
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struct timespec last_seen;
159
143
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/* Used for passing in values through the Avahi callback functions */
161
145
typedef struct {
146
AvahiSimplePoll *simple_poll;
162
147
AvahiServer *server;
163
148
gnutls_certificate_credentials_t cred;
164
149
unsigned int dh_bits;
166
151
const char *priority;
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gpgme_ctx_t ctx;
168
153
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
154
} mandos_context;
172
155
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/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
156
/* global context so signal handler can reach it*/
157
mandos_context mc = { .simple_poll = NULL, .server = NULL,
158
.dh_bits = 1024, .priority = "SECURE256"
159
":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };
175
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sig_atomic_t quit_now = 0;
177
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int signal_received = 0;
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/* Function to use when printing errors */
180
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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;
166
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
185
167
perror(print_text);
186
168
}
187
169
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
170
/*
199
171
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
172
* bytes. "buffer_capacity" is how much is currently allocated,
201
173
* "buffer_length" is how much is already used.
202
174
*/
203
__attribute__((nonnull, warn_unused_result))
204
175
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
176
size_t buffer_capacity){
206
177
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;
178
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
179
if(buffer == NULL){
213
180
return 0;
214
181
}
215
*buffer = new_buf;
216
182
buffer_capacity += BUFFER_SIZE;
217
183
}
218
184
return buffer_capacity;
219
185
}
220
186
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){
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
189
int af){
225
190
int ret;
226
191
server *new_server = malloc(sizeof(server));
227
192
if(new_server == NULL){
228
193
perror_plus("malloc");
229
return false;
194
return -1;
230
195
}
231
196
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
197
.port = port,
198
.if_index = if_index,
199
.af = af };
235
200
if(new_server->ip == NULL){
236
201
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){
202
return -1;
203
}
204
/* uniqe case of first server */
205
if (mc.current_server == NULL){
256
206
new_server->next = new_server;
257
207
new_server->prev = new_server;
258
*current_server = new_server;
208
mc.current_server = new_server;
209
/* Placing the new server last in the list */
259
210
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
211
new_server->next = mc.current_server;
212
new_server->prev = mc.current_server->prev;
263
213
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
214
mc.current_server->prev = new_server;
215
}
216
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
217
if(ret == -1){
218
perror_plus("clock_gettime");
219
return -1;
220
}
221
return 0;
267
222
}
268
223
269
224
/*
270
225
* Initialize GPGME.
271
226
*/
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){
227
static bool init_gpgme(const char *seckey,
228
const char *pubkey, const char *tempdir){
277
229
gpgme_error_t rc;
278
230
gpgme_engine_info_t engine_info;
279
231
232
280
233
/*
281
234
* Helper function to insert pub and seckey to the engine keyring.
282
235
*/
283
bool import_key(const char * const filename){
236
bool import_key(const char *filename){
284
237
int ret;
285
238
int fd;
286
239
gpgme_data_t pgp_data;
293
246
294
247
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
248
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));
249
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
250
gpgme_strsource(rc), gpgme_strerror(rc));
298
251
return false;
299
252
}
300
253
301
rc = gpgme_op_import(mc->ctx, pgp_data);
254
rc = gpgme_op_import(mc.ctx, pgp_data);
302
255
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
256
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
305
258
return false;
306
259
}
307
260
308
ret = close(fd);
261
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
262
if(ret == -1){
310
263
perror_plus("close");
311
264
}
314
267
}
315
268
316
269
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
270
fprintf(stderr, "Initializing GPGME\n");
318
271
}
319
272
320
273
/* Init GPGME */
321
274
gpgme_check_version(NULL);
322
275
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
276
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));
277
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
278
gpgme_strsource(rc), gpgme_strerror(rc));
326
279
return false;
327
280
}
328
281
329
/* Set GPGME home directory for the OpenPGP engine only */
282
/* Set GPGME home directory for the OpenPGP engine only */
330
283
rc = gpgme_get_engine_info(&engine_info);
331
284
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));
285
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
334
287
return false;
335
288
}
336
289
while(engine_info != NULL){
342
295
engine_info = engine_info->next;
343
296
}
344
297
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
298
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
299
return false;
348
300
}
349
301
350
302
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
303
rc = gpgme_new(&(mc.ctx));
352
304
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));
305
fprintf(stderr, "bad gpgme_new: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
356
307
return false;
357
308
}
358
309
367
318
* Decrypt OpenPGP data.
368
319
* Returns -1 on error
369
320
*/
370
__attribute__((nonnull, warn_unused_result))
371
321
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
322
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
323
char **plaintext){
375
324
gpgme_data_t dh_crypto, dh_plain;
376
325
gpgme_error_t rc;
377
326
ssize_t ret;
379
328
ssize_t plaintext_length = 0;
380
329
381
330
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
331
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
332
}
384
333
385
334
/* Create new GPGME data buffer from memory cryptotext */
386
335
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
336
0);
388
337
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));
338
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
391
340
return -1;
392
341
}
393
342
394
343
/* Create new empty GPGME data buffer for the plaintext */
395
344
rc = gpgme_data_new(&dh_plain);
396
345
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));
346
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
347
gpgme_strsource(rc), gpgme_strerror(rc));
400
348
gpgme_data_release(dh_crypto);
401
349
return -1;
402
350
}
403
351
404
352
/* Decrypt data from the cryptotext data buffer to the plaintext
405
353
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
354
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
355
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
356
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
410
358
plaintext_length = -1;
411
359
if(debug){
412
360
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
361
result = gpgme_op_decrypt_result(mc.ctx);
414
362
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
363
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
364
} 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);
365
fprintf(stderr, "Unsupported algorithm: %s\n",
366
result->unsupported_algorithm);
367
fprintf(stderr, "Wrong key usage: %u\n",
368
result->wrong_key_usage);
421
369
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
370
fprintf(stderr, "File name: %s\n", result->file_name);
423
371
}
424
372
gpgme_recipient_t recipient;
425
373
recipient = result->recipients;
426
374
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");
375
fprintf(stderr, "Public key algorithm: %s\n",
376
gpgme_pubkey_algo_name(recipient->pubkey_algo));
377
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
378
fprintf(stderr, "Secret key available: %s\n",
379
recipient->status == GPG_ERR_NO_SECKEY
380
? "No" : "Yes");
434
381
recipient = recipient->next;
435
382
}
436
383
}
439
386
}
440
387
441
388
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
389
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
390
}
444
391
445
392
/* Seek back to the beginning of the GPGME plaintext data buffer */
452
399
*plaintext = NULL;
453
400
while(true){
454
401
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
402
(size_t)plaintext_length,
403
plaintext_capacity);
457
404
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
405
perror_plus("incbuffer");
406
plaintext_length = -1;
407
goto decrypt_end;
461
408
}
462
409
463
410
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
476
423
}
477
424
478
425
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
426
fprintf(stderr, "Decrypted password is: ");
480
427
for(ssize_t i = 0; i < plaintext_length; i++){
481
428
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
429
}
493
440
return plaintext_length;
494
441
}
495
442
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);
443
static const char * safer_gnutls_strerror(int value){
444
const char *ret = gnutls_strerror(value); /* Spurious warning from
445
-Wunreachable-code */
446
if(ret == NULL)
447
ret = "(unknown)";
448
return ret;
507
449
}
508
450
509
451
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
452
static void debuggnutls(__attribute__((unused)) int level,
512
453
const char* string){
513
fprintf_plus(stderr, "GnuTLS: %s", string);
454
fprintf(stderr, "GnuTLS: %s", string);
514
455
}
515
456
516
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
457
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
458
const char *seckeyfilename){
521
459
int ret;
522
unsigned int uret;
523
460
524
461
if(debug){
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
462
fprintf(stderr, "Initializing GnuTLS\n");
463
}
464
465
ret = gnutls_global_init();
466
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "GnuTLS global_init: %s\n",
468
safer_gnutls_strerror(ret));
469
return -1;
526
470
}
527
471
528
472
if(debug){
534
478
}
535
479
536
480
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
481
gnutls_certificate_allocate_credentials(&mc.cred);
538
482
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
483
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
484
from
485
-Wunreachable-code
486
*/
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
541
489
return -1;
542
490
}
543
491
544
492
if(debug){
545
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
546
" secret key %s as GnuTLS credentials\n",
547
pubkeyfilename,
548
seckeyfilename);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
549
496
}
550
497
551
498
ret = gnutls_certificate_set_openpgp_key_file
552
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
553
500
GNUTLS_OPENPGP_FMT_BASE64);
554
501
if(ret != GNUTLS_E_SUCCESS){
555
fprintf_plus(stderr,
556
"Error[%d] while reading the OpenPGP key pair ('%s',"
557
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
558
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
559
safer_gnutls_strerror(ret));
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
560
507
goto globalfail;
561
508
}
562
509
563
510
/* GnuTLS server initialization */
564
ret = gnutls_dh_params_init(&mc->dh_params);
565
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
567
" initialization: %s\n",
568
safer_gnutls_strerror(ret));
569
goto globalfail;
570
}
571
/* If a Diffie-Hellman parameters file was given, try to use it */
572
if(dhparamsfilename != NULL){
573
gnutls_datum_t params = { .data = NULL, .size = 0 };
574
do {
575
int dhpfile = open(dhparamsfilename, O_RDONLY);
576
if(dhpfile == -1){
577
perror_plus("open");
578
dhparamsfilename = NULL;
579
break;
580
}
581
size_t params_capacity = 0;
582
while(true){
583
params_capacity = incbuffer((char **)¶ms.data,
584
(size_t)params.size,
585
(size_t)params_capacity);
586
if(params_capacity == 0){
587
perror_plus("incbuffer");
588
free(params.data);
589
params.data = NULL;
590
dhparamsfilename = NULL;
591
break;
592
}
593
ssize_t bytes_read = read(dhpfile,
594
params.data + params.size,
595
BUFFER_SIZE);
596
/* EOF */
597
if(bytes_read == 0){
598
break;
599
}
600
/* check bytes_read for failure */
601
if(bytes_read < 0){
602
perror_plus("read");
603
free(params.data);
604
params.data = NULL;
605
dhparamsfilename = NULL;
606
break;
607
}
608
params.size += (unsigned int)bytes_read;
609
}
610
if(params.data == NULL){
611
dhparamsfilename = NULL;
612
}
613
if(dhparamsfilename == NULL){
614
break;
615
}
616
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
617
GNUTLS_X509_FMT_PEM);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Failed to parse DH parameters in file"
620
" \"%s\": %s\n", dhparamsfilename,
621
safer_gnutls_strerror(ret));
622
dhparamsfilename = NULL;
623
}
624
} while(false);
625
}
626
if(dhparamsfilename == NULL){
627
if(mc->dh_bits == 0){
628
/* Find out the optimal number of DH bits */
629
/* Try to read the private key file */
630
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
631
do {
632
int secfile = open(seckeyfilename, O_RDONLY);
633
if(secfile == -1){
634
perror_plus("open");
635
break;
636
}
637
size_t buffer_capacity = 0;
638
while(true){
639
buffer_capacity = incbuffer((char **)&buffer.data,
640
(size_t)buffer.size,
641
(size_t)buffer_capacity);
642
if(buffer_capacity == 0){
643
perror_plus("incbuffer");
644
free(buffer.data);
645
buffer.data = NULL;
646
break;
647
}
648
ssize_t bytes_read = read(secfile,
649
buffer.data + buffer.size,
650
BUFFER_SIZE);
651
/* EOF */
652
if(bytes_read == 0){
653
break;
654
}
655
/* check bytes_read for failure */
656
if(bytes_read < 0){
657
perror_plus("read");
658
free(buffer.data);
659
buffer.data = NULL;
660
break;
661
}
662
buffer.size += (unsigned int)bytes_read;
663
}
664
close(secfile);
665
} while(false);
666
/* If successful, use buffer to parse private key */
667
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
668
if(buffer.data != NULL){
669
{
670
gnutls_openpgp_privkey_t privkey = NULL;
671
ret = gnutls_openpgp_privkey_init(&privkey);
672
if(ret != GNUTLS_E_SUCCESS){
673
fprintf_plus(stderr, "Error initializing OpenPGP key"
674
" structure: %s",
675
safer_gnutls_strerror(ret));
676
free(buffer.data);
677
buffer.data = NULL;
678
} else {
679
ret = gnutls_openpgp_privkey_import
680
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
681
if(ret != GNUTLS_E_SUCCESS){
682
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
683
safer_gnutls_strerror(ret));
684
privkey = NULL;
685
}
686
free(buffer.data);
687
buffer.data = NULL;
688
if(privkey != NULL){
689
/* Use private key to suggest an appropriate
690
sec_param */
691
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
692
gnutls_openpgp_privkey_deinit(privkey);
693
if(debug){
694
fprintf_plus(stderr, "This OpenPGP key implies using"
695
" a GnuTLS security parameter \"%s\".\n",
696
safe_string(gnutls_sec_param_get_name
697
(sec_param)));
698
}
699
}
700
}
701
}
702
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
703
/* Err on the side of caution */
704
sec_param = GNUTLS_SEC_PARAM_ULTRA;
705
if(debug){
706
fprintf_plus(stderr, "Falling back to security parameter"
707
" \"%s\"\n",
708
safe_string(gnutls_sec_param_get_name
709
(sec_param)));
710
}
711
}
712
}
713
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
714
if(uret != 0){
715
mc->dh_bits = uret;
716
if(debug){
717
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
718
" implies %u DH bits; using that.\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)),
721
mc->dh_bits);
722
}
723
} else {
724
fprintf_plus(stderr, "Failed to get implied number of DH"
725
" bits for security parameter \"%s\"): %s\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
safer_gnutls_strerror(ret));
729
goto globalfail;
730
}
731
} else if(debug){
732
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
733
mc->dh_bits);
734
}
735
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
736
if(ret != GNUTLS_E_SUCCESS){
737
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
738
" bits): %s\n", mc->dh_bits,
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
}
743
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
515
goto globalfail;
516
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
521
goto globalfail;
522
}
523
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
744
525
745
526
return 0;
746
527
747
528
globalfail:
748
529
749
gnutls_certificate_free_credentials(mc->cred);
750
gnutls_dh_params_deinit(mc->dh_params);
530
gnutls_certificate_free_credentials(mc.cred);
531
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
751
533
return -1;
752
534
}
753
535
754
__attribute__((nonnull, warn_unused_result))
755
static int init_gnutls_session(gnutls_session_t *session,
756
mandos_context *mc){
536
static int init_gnutls_session(gnutls_session_t *session){
757
537
int ret;
758
538
/* GnuTLS session creation */
759
539
do {
763
543
}
764
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
765
545
if(ret != GNUTLS_E_SUCCESS){
766
fprintf_plus(stderr,
767
"Error in GnuTLS session initialization: %s\n",
768
safer_gnutls_strerror(ret));
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
769
548
}
770
549
771
550
{
772
551
const char *err;
773
552
do {
774
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
775
554
if(quit_now){
776
555
gnutls_deinit(*session);
777
556
return -1;
778
557
}
779
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
780
559
if(ret != GNUTLS_E_SUCCESS){
781
fprintf_plus(stderr, "Syntax error at: %s\n", err);
782
fprintf_plus(stderr, "GnuTLS error: %s\n",
783
safer_gnutls_strerror(ret));
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
784
563
gnutls_deinit(*session);
785
564
return -1;
786
565
}
788
567
789
568
do {
790
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
791
mc->cred);
570
mc.cred);
792
571
if(quit_now){
793
572
gnutls_deinit(*session);
794
573
return -1;
795
574
}
796
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
797
576
if(ret != GNUTLS_E_SUCCESS){
798
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
799
safer_gnutls_strerror(ret));
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
800
579
gnutls_deinit(*session);
801
580
return -1;
802
581
}
804
583
/* ignore client certificate if any. */
805
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
806
585
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
587
807
588
return 0;
808
589
}
809
590
811
592
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
812
593
__attribute__((unused)) const char *txt){}
813
594
814
/* Set effective uid to 0, return errno */
815
__attribute__((warn_unused_result))
816
error_t raise_privileges(void){
817
error_t old_errno = errno;
818
error_t ret_errno = 0;
819
if(seteuid(0) == -1){
820
ret_errno = errno;
821
}
822
errno = old_errno;
823
return ret_errno;
824
}
825
826
/* Set effective and real user ID to 0. Return errno. */
827
__attribute__((warn_unused_result))
828
error_t raise_privileges_permanently(void){
829
error_t old_errno = errno;
830
error_t ret_errno = raise_privileges();
831
if(ret_errno != 0){
832
errno = old_errno;
833
return ret_errno;
834
}
835
if(setuid(0) == -1){
836
ret_errno = errno;
837
}
838
errno = old_errno;
839
return ret_errno;
840
}
841
842
/* Set effective user ID to unprivileged saved user ID */
843
__attribute__((warn_unused_result))
844
error_t lower_privileges(void){
845
error_t old_errno = errno;
846
error_t ret_errno = 0;
847
if(seteuid(uid) == -1){
848
ret_errno = errno;
849
}
850
errno = old_errno;
851
return ret_errno;
852
}
853
854
/* Lower privileges permanently */
855
__attribute__((warn_unused_result))
856
error_t lower_privileges_permanently(void){
857
error_t old_errno = errno;
858
error_t ret_errno = 0;
859
if(setuid(uid) == -1){
860
ret_errno = errno;
861
}
862
errno = old_errno;
863
return ret_errno;
864
}
865
866
/* Helper function to add_local_route() and delete_local_route() */
867
__attribute__((nonnull, warn_unused_result))
868
static bool add_delete_local_route(const bool add,
869
const char *address,
870
AvahiIfIndex if_index){
871
int ret;
872
char helper[] = "mandos-client-iprouteadddel";
873
char add_arg[] = "add";
874
char delete_arg[] = "delete";
875
char debug_flag[] = "--debug";
876
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
877
if(pluginhelperdir == NULL){
878
if(debug){
879
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
880
" variable not set; cannot run helper\n");
881
}
882
return false;
883
}
884
885
char interface[IF_NAMESIZE];
886
if(if_indextoname((unsigned int)if_index, interface) == NULL){
887
perror_plus("if_indextoname");
888
return false;
889
}
890
891
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
892
if(devnull == -1){
893
perror_plus("open(\"/dev/null\", O_RDONLY)");
894
return false;
895
}
896
pid_t pid = fork();
897
if(pid == 0){
898
/* Child */
899
/* Raise privileges */
900
errno = raise_privileges_permanently();
901
if(errno != 0){
902
perror_plus("Failed to raise privileges");
903
/* _exit(EX_NOPERM); */
904
} else {
905
/* Set group */
906
errno = 0;
907
ret = setgid(0);
908
if(ret == -1){
909
perror_plus("setgid");
910
_exit(EX_NOPERM);
911
}
912
/* Reset supplementary groups */
913
errno = 0;
914
ret = setgroups(0, NULL);
915
if(ret == -1){
916
perror_plus("setgroups");
917
_exit(EX_NOPERM);
918
}
919
}
920
ret = dup2(devnull, STDIN_FILENO);
921
if(ret == -1){
922
perror_plus("dup2(devnull, STDIN_FILENO)");
923
_exit(EX_OSERR);
924
}
925
ret = close(devnull);
926
if(ret == -1){
927
perror_plus("close");
928
_exit(EX_OSERR);
929
}
930
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
931
if(ret == -1){
932
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
933
_exit(EX_OSERR);
934
}
935
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
936
O_RDONLY
937
| O_DIRECTORY
938
| O_PATH
939
| O_CLOEXEC));
940
if(helperdir_fd == -1){
941
perror_plus("open");
942
_exit(EX_UNAVAILABLE);
943
}
944
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
945
helper, O_RDONLY));
946
if(helper_fd == -1){
947
perror_plus("openat");
948
close(helperdir_fd);
949
_exit(EX_UNAVAILABLE);
950
}
951
close(helperdir_fd);
952
#ifdef __GNUC__
953
#pragma GCC diagnostic push
954
#pragma GCC diagnostic ignored "-Wcast-qual"
955
#endif
956
if(fexecve(helper_fd, (char *const [])
957
{ helper, add ? add_arg : delete_arg, (char *)address,
958
interface, debug ? debug_flag : NULL, NULL },
959
environ) == -1){
960
#ifdef __GNUC__
961
#pragma GCC diagnostic pop
962
#endif
963
perror_plus("fexecve");
964
_exit(EXIT_FAILURE);
965
}
966
}
967
if(pid == -1){
968
perror_plus("fork");
969
return false;
970
}
971
int status;
972
pid_t pret = -1;
973
errno = 0;
974
do {
975
pret = waitpid(pid, &status, 0);
976
if(pret == -1 and errno == EINTR and quit_now){
977
int errno_raising = 0;
978
if((errno = raise_privileges()) != 0){
979
errno_raising = errno;
980
perror_plus("Failed to raise privileges in order to"
981
" kill helper program");
982
}
983
if(kill(pid, SIGTERM) == -1){
984
perror_plus("kill");
985
}
986
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
987
perror_plus("Failed to lower privileges after killing"
988
" helper program");
989
}
990
return false;
991
}
992
} while(pret == -1 and errno == EINTR);
993
if(pret == -1){
994
perror_plus("waitpid");
995
return false;
996
}
997
if(WIFEXITED(status)){
998
if(WEXITSTATUS(status) != 0){
999
fprintf_plus(stderr, "Error: iprouteadddel exited"
1000
" with status %d\n", WEXITSTATUS(status));
1001
return false;
1002
}
1003
return true;
1004
}
1005
if(WIFSIGNALED(status)){
1006
fprintf_plus(stderr, "Error: iprouteadddel died by"
1007
" signal %d\n", WTERMSIG(status));
1008
return false;
1009
}
1010
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1011
return false;
1012
}
1013
1014
__attribute__((nonnull, warn_unused_result))
1015
static bool add_local_route(const char *address,
1016
AvahiIfIndex if_index){
1017
if(debug){
1018
fprintf_plus(stderr, "Adding route to %s\n", address);
1019
}
1020
return add_delete_local_route(true, address, if_index);
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool delete_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Removing route to %s\n", address);
1028
}
1029
return add_delete_local_route(false, address, if_index);
1030
}
1031
1032
595
/* Called when a Mandos server is found */
1033
__attribute__((nonnull, warn_unused_result))
1034
static int start_mandos_communication(const char *ip, in_port_t port,
596
static int start_mandos_communication(const char *ip, uint16_t port,
1035
597
AvahiIfIndex if_index,
1036
int af, mandos_context *mc){
598
int af){
1037
599
int ret, tcp_sd = -1;
1038
600
ssize_t sret;
1039
struct sockaddr_storage to;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
1040
605
char *buffer = NULL;
1041
606
char *decrypted_buffer = NULL;
1042
607
size_t buffer_length = 0;
1045
610
int retval = -1;
1046
611
gnutls_session_t session;
1047
612
int pf; /* Protocol family */
1048
bool route_added = false;
1049
613
1050
614
errno = 0;
1051
615
1062
626
pf = PF_INET;
1063
627
break;
1064
628
default:
1065
fprintf_plus(stderr, "Bad address family: %d\n", af);
629
fprintf(stderr, "Bad address family: %d\n", af);
1066
630
errno = EINVAL;
1067
631
return -1;
1068
632
}
1069
633
1070
/* If the interface is specified and we have a list of interfaces */
1071
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1072
/* Check if the interface is one of the interfaces we are using */
1073
bool match = false;
1074
{
1075
char *interface = NULL;
1076
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1077
interface))){
1078
if(if_nametoindex(interface) == (unsigned int)if_index){
1079
match = true;
1080
break;
1081
}
1082
}
1083
}
1084
if(not match){
1085
/* This interface does not match any in the list, so we don't
1086
connect to the server */
1087
if(debug){
1088
char interface[IF_NAMESIZE];
1089
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1090
perror_plus("if_indextoname");
1091
} else {
1092
fprintf_plus(stderr, "Skipping server on non-used interface"
1093
" \"%s\"\n",
1094
if_indextoname((unsigned int)if_index,
1095
interface));
1096
}
1097
}
1098
return -1;
1099
}
1100
}
1101
1102
ret = init_gnutls_session(&session, mc);
634
ret = init_gnutls_session(&session);
1103
635
if(ret != 0){
1104
636
return -1;
1105
637
}
1106
638
1107
639
if(debug){
1108
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1109
PRIuMAX "\n", ip, (uintmax_t)port);
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
1110
642
}
1111
643
1112
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
1113
645
if(tcp_sd < 0){
1114
646
int e = errno;
1115
647
perror_plus("socket");
1122
654
goto mandos_end;
1123
655
}
1124
656
657
memset(&to, 0, sizeof(to));
1125
658
if(af == AF_INET6){
1126
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1127
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1128
ret = inet_pton(af, ip, &to6->sin6_addr);
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1129
661
} else { /* IPv4 */
1130
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1131
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to4->sin_addr);
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
1133
664
}
1134
665
if(ret < 0 ){
1135
666
int e = errno;
1139
670
}
1140
671
if(ret == 0){
1141
672
int e = errno;
1142
fprintf_plus(stderr, "Bad address: %s\n", ip);
673
fprintf(stderr, "Bad address: %s\n", ip);
1143
674
errno = e;
1144
675
goto mandos_end;
1145
676
}
1146
677
if(af == AF_INET6){
1147
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1148
if(IN6_IS_ADDR_LINKLOCAL
1149
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
1150
685
if(if_index == AVAHI_IF_UNSPEC){
1151
fprintf_plus(stderr, "An IPv6 link-local address is"
1152
" incomplete without a network interface\n");
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
1153
688
errno = EINVAL;
1154
689
goto mandos_end;
1155
690
}
1156
691
/* Set the network interface number as scope */
1157
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
692
to.in6.sin6_scope_id = (uint32_t)if_index;
1158
693
}
1159
694
} else {
1160
((struct sockaddr_in *)&to)->sin_port = htons(port);
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
1161
698
}
1162
699
1163
700
if(quit_now){
1171
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1172
709
perror_plus("if_indextoname");
1173
710
} else {
1174
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1175
"\n", ip, interface, (uintmax_t)port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
1176
713
}
1177
714
} else {
1178
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1179
ip, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
1180
717
}
1181
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1182
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1183
if(af == AF_INET6){
1184
ret = getnameinfo((struct sockaddr *)&to,
1185
sizeof(struct sockaddr_in6),
1186
addrstr, sizeof(addrstr), NULL, 0,
1187
NI_NUMERICHOST);
1188
} else {
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in),
1191
addrstr, sizeof(addrstr), NULL, 0,
1192
NI_NUMERICHOST);
1193
}
1194
if(ret == EAI_SYSTEM){
1195
perror_plus("getnameinfo");
1196
} else if(ret != 0) {
1197
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1198
} else if(strcmp(addrstr, ip) != 0){
1199
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1200
}
1201
}
1202
1203
if(quit_now){
1204
errno = EINTR;
1205
goto mandos_end;
1206
}
1207
1208
while(true){
1209
if(af == AF_INET6){
1210
ret = connect(tcp_sd, (struct sockaddr *)&to,
1211
sizeof(struct sockaddr_in6));
1212
} else {
1213
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1214
sizeof(struct sockaddr_in));
1215
}
1216
if(ret < 0){
1217
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1218
and if_index != AVAHI_IF_UNSPEC
1219
and connect_to == NULL
1220
and not route_added and
1221
((af == AF_INET6 and not
1222
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1223
&to)->sin6_addr)))
1224
or (af == AF_INET and
1225
/* Not a a IPv4LL address */
1226
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1227
& 0xFFFF0000L) != 0xA9FE0000L))){
1228
/* Work around Avahi bug - Avahi does not announce link-local
1229
addresses if it has a global address, so local hosts with
1230
*only* a link-local address (e.g. Mandos clients) cannot
1231
connect to a Mandos server announced by Avahi on a server
1232
host with a global address. Work around this by retrying
1233
with an explicit route added with the server's address.
1234
1235
Avahi bug reference:
1236
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1237
https://bugs.debian.org/587961
1238
*/
1239
if(debug){
1240
fprintf_plus(stderr, "Mandos server unreachable, trying"
1241
" direct route\n");
1242
}
1243
int e = errno;
1244
route_added = add_local_route(ip, if_index);
1245
if(route_added){
1246
continue;
1247
}
1248
errno = e;
1249
}
1250
if(errno != ECONNREFUSED or debug){
1251
int e = errno;
1252
perror_plus("connect");
1253
errno = e;
1254
}
1255
goto mandos_end;
1256
}
1257
1258
if(quit_now){
1259
errno = EINTR;
1260
goto mandos_end;
1261
}
1262
break;
720
const char *pcret;
721
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
724
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
727
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
730
} else {
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
733
}
734
}
735
}
736
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
744
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
}
747
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
1263
759
}
1264
760
1265
761
const char *out = mandos_protocol_version;
1267
763
while(true){
1268
764
size_t out_size = strlen(out);
1269
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1270
out_size - written));
766
out_size - written));
1271
767
if(ret == -1){
1272
768
int e = errno;
1273
769
perror_plus("write");
1293
789
}
1294
790
1295
791
if(debug){
1296
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1297
793
}
1298
794
1299
795
if(quit_now){
1300
796
errno = EINTR;
1301
797
goto mandos_end;
1302
798
}
1303
1304
/* This casting via intptr_t is to eliminate warning about casting
1305
an int to a pointer type. This is exactly how the GnuTLS Guile
1306
function "set-session-transport-fd!" does it. */
1307
gnutls_transport_set_ptr(session,
1308
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
799
800
/* Spurious warnings from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1309
802
1310
803
if(quit_now){
1311
804
errno = EINTR;
1322
815
1323
816
if(ret != GNUTLS_E_SUCCESS){
1324
817
if(debug){
1325
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1326
819
gnutls_perror(ret);
1327
820
}
1328
821
errno = EPROTO;
1332
825
/* Read OpenPGP packet that contains the wanted password */
1333
826
1334
827
if(debug){
1335
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1336
" %s\n", ip);
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
1337
830
}
1338
831
1339
832
while(true){
1344
837
}
1345
838
1346
839
buffer_capacity = incbuffer(&buffer, buffer_length,
1347
buffer_capacity);
840
buffer_capacity);
1348
841
if(buffer_capacity == 0){
1349
842
int e = errno;
1350
843
perror_plus("incbuffer");
1377
870
}
1378
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1379
872
if(ret < 0){
1380
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1381
"***\n");
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1382
874
gnutls_perror(ret);
1383
875
errno = EPROTO;
1384
876
goto mandos_end;
1385
877
}
1386
878
break;
1387
879
default:
1388
fprintf_plus(stderr, "Unknown error while reading data from"
1389
" encrypted session with Mandos server\n");
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
1390
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1391
883
errno = EIO;
1392
884
goto mandos_end;
1397
889
}
1398
890
1399
891
if(debug){
1400
fprintf_plus(stderr, "Closing TLS session\n");
892
fprintf(stderr, "Closing TLS session\n");
1401
893
}
1402
894
1403
895
if(quit_now){
1415
907
1416
908
if(buffer_length > 0){
1417
909
ssize_t decrypted_buffer_size;
1418
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1419
&decrypted_buffer, mc);
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
1420
913
if(decrypted_buffer_size >= 0){
1421
914
1422
915
written = 0;
1432
925
if(ret == 0 and ferror(stdout)){
1433
926
int e = errno;
1434
927
if(debug){
1435
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1436
strerror(errno));
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1437
930
}
1438
931
errno = e;
1439
932
goto mandos_end;
1448
941
1449
942
mandos_end:
1450
943
{
1451
if(route_added){
1452
if(not delete_local_route(ip, if_index)){
1453
fprintf_plus(stderr, "Failed to delete local route to %s on"
1454
" interface %d", ip, if_index);
1455
}
1456
}
1457
944
int e = errno;
1458
945
free(decrypted_buffer);
1459
946
free(buffer);
1460
947
if(tcp_sd >= 0){
1461
ret = close(tcp_sd);
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1462
949
}
1463
950
if(ret == -1){
1464
951
if(e == 0){
1476
963
return retval;
1477
964
}
1478
965
1479
__attribute__((nonnull))
1480
966
static void resolve_callback(AvahiSServiceResolver *r,
1481
967
AvahiIfIndex interface,
1482
968
AvahiProtocol proto,
1490
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
1491
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1492
978
flags,
1493
void *mc){
1494
if(r == NULL){
1495
return;
1496
}
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1497
981
1498
982
/* Called whenever a service has been resolved successfully or
1499
983
timed out */
1500
984
1501
985
if(quit_now){
1502
avahi_s_service_resolver_free(r);
1503
986
return;
1504
987
}
1505
988
1506
989
switch(event){
1507
990
default:
1508
991
case AVAHI_RESOLVER_FAILURE:
1509
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1510
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1511
domain,
1512
avahi_strerror(avahi_server_errno
1513
(((mandos_context*)mc)->server)));
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1514
995
break;
1515
996
1516
997
case AVAHI_RESOLVER_FOUND:
1518
999
char ip[AVAHI_ADDRESS_STR_MAX];
1519
1000
avahi_address_snprint(ip, sizeof(ip), address);
1520
1001
if(debug){
1521
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1522
PRIdMAX ") on port %" PRIu16 "\n", name,
1523
host_name, ip, (intmax_t)interface, port);
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1524
1005
}
1525
int ret = start_mandos_communication(ip, (in_port_t)port,
1526
interface,
1527
avahi_proto_to_af(proto),
1528
mc);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1529
1008
if(ret == 0){
1530
avahi_simple_poll_quit(simple_poll);
1009
avahi_simple_poll_quit(mc.simple_poll);
1531
1010
} else {
1532
if(not add_server(ip, (in_port_t)port, interface,
1533
avahi_proto_to_af(proto),
1534
&((mandos_context*)mc)->current_server)){
1535
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1536
" list\n", name);
1537
}
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1538
1013
}
1539
1014
}
1540
1015
}
1550
1025
const char *domain,
1551
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1552
1027
flags,
1553
void *mc){
1554
if(b == NULL){
1555
return;
1556
}
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1557
1030
1558
1031
/* Called whenever a new services becomes available on the LAN or
1559
1032
is removed from the LAN */
1566
1039
default:
1567
1040
case AVAHI_BROWSER_FAILURE:
1568
1041
1569
fprintf_plus(stderr, "(Avahi browser) %s\n",
1570
avahi_strerror(avahi_server_errno
1571
(((mandos_context*)mc)->server)));
1572
avahi_simple_poll_quit(simple_poll);
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1573
1045
return;
1574
1046
1575
1047
case AVAHI_BROWSER_NEW:
1578
1050
the callback function is called the Avahi server will free the
1579
1051
resolver for us. */
1580
1052
1581
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1582
interface, protocol, name, type,
1583
domain, protocol, 0,
1584
resolve_callback, mc) == NULL)
1585
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1586
" %s\n", name,
1587
avahi_strerror(avahi_server_errno
1588
(((mandos_context*)mc)->server)));
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1589
1058
break;
1590
1059
1591
1060
case AVAHI_BROWSER_REMOVE:
1594
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1595
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1596
1065
if(debug){
1597
fprintf_plus(stderr, "No Mandos server found, still"
1598
" searching...\n");
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1599
1067
}
1600
1068
break;
1601
1069
}
1602
1070
}
1603
1071
1604
/* Signal handler that stops main loop after SIGTERM */
1072
/* Signal handler that stops main loop after sigterm has been called */
1605
1073
static void handle_sigterm(int sig){
1606
1074
if(quit_now){
1607
1075
return;
1610
1078
signal_received = sig;
1611
1079
int old_errno = errno;
1612
1080
/* set main loop to exit */
1613
if(simple_poll != NULL){
1614
avahi_simple_poll_quit(simple_poll);
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1615
1083
}
1616
1084
errno = old_errno;
1617
1085
}
1618
1086
1619
__attribute__((nonnull, warn_unused_result))
1620
bool get_flags(const char *ifname, struct ifreq *ifr){
1621
int ret;
1622
error_t ret_errno;
1623
1624
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1625
if(s < 0){
1626
ret_errno = errno;
1627
perror_plus("socket");
1628
errno = ret_errno;
1629
return false;
1630
}
1631
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1632
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1633
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1634
if(ret == -1){
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1635
1143
if(debug){
1636
ret_errno = errno;
1637
perror_plus("ioctl SIOCGIFFLAGS");
1638
errno = ret_errno;
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1639
1146
}
1640
return false;
1147
free(flagstring);
1148
return 0;
1641
1149
}
1642
return true;
1643
}
1644
1645
__attribute__((nonnull, warn_unused_result))
1646
bool good_flags(const char *ifname, const struct ifreq *ifr){
1647
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1648
1152
/* Reject the loopback device */
1649
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1650
1154
if(debug){
1651
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1652
ifname);
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1653
1157
}
1654
return false;
1158
return 0;
1655
1159
}
1656
1160
/* Accept point-to-point devices only if connect_to is specified */
1657
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1658
1162
if(debug){
1659
fprintf_plus(stderr, "Accepting point-to-point interface"
1660
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1661
1165
}
1662
return true;
1166
return 1;
1663
1167
}
1664
1168
/* Otherwise, reject non-broadcast-capable devices */
1665
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1666
1170
if(debug){
1667
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1668
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1669
1173
}
1670
return false;
1174
return 0;
1671
1175
}
1672
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1673
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1674
1178
if(debug){
1675
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1676
ifname);
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1677
1181
}
1678
return false;
1182
return 0;
1679
1183
}
1680
1681
1184
/* Accept this device */
1682
1185
if(debug){
1683
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1684
}
1685
return true;
1686
}
1687
1688
/*
1689
* This function determines if a directory entry in /sys/class/net
1690
* corresponds to an acceptable network device.
1691
* (This function is passed to scandir(3) as a filter function.)
1692
*/
1693
__attribute__((nonnull, warn_unused_result))
1694
int good_interface(const struct dirent *if_entry){
1695
if(if_entry->d_name[0] == '.'){
1696
return 0;
1697
}
1698
1699
struct ifreq ifr;
1700
if(not get_flags(if_entry->d_name, &ifr)){
1701
if(debug){
1702
fprintf_plus(stderr, "Failed to get flags for interface "
1703
"\"%s\"\n", if_entry->d_name);
1704
}
1705
return 0;
1706
}
1707
1708
if(not good_flags(if_entry->d_name, &ifr)){
1709
return 0;
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1710
1188
}
1711
1189
return 1;
1712
1190
}
1713
1191
1714
/*
1715
* This function determines if a network interface is up.
1716
*/
1717
__attribute__((nonnull, warn_unused_result))
1718
bool interface_is_up(const char *interface){
1719
struct ifreq ifr;
1720
if(not get_flags(interface, &ifr)){
1721
if(debug){
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1723
"\"%s\"\n", interface);
1724
}
1725
return false;
1726
}
1727
1728
return (bool)(ifr.ifr_flags & IFF_UP);
1729
}
1730
1731
/*
1732
* This function determines if a network interface is running
1733
*/
1734
__attribute__((nonnull, warn_unused_result))
1735
bool interface_is_running(const char *interface){
1736
struct ifreq ifr;
1737
if(not get_flags(interface, &ifr)){
1738
if(debug){
1739
fprintf_plus(stderr, "Failed to get flags for interface "
1740
"\"%s\"\n", interface);
1741
}
1742
return false;
1743
}
1744
1745
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1746
}
1747
1748
__attribute__((nonnull, pure, warn_unused_result))
1749
1192
int notdotentries(const struct dirent *direntry){
1750
1193
/* Skip "." and ".." */
1751
1194
if(direntry->d_name[0] == '.'
1757
1200
return 1;
1758
1201
}
1759
1202
1760
/* Is this directory entry a runnable program? */
1761
__attribute__((nonnull, warn_unused_result))
1762
int runnable_hook(const struct dirent *direntry){
1763
int ret;
1764
size_t sret;
1765
struct stat st;
1766
1767
if((direntry->d_name)[0] == '\0'){
1768
/* Empty name? */
1769
return 0;
1770
}
1771
1772
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1773
"abcdefghijklmnopqrstuvwxyz"
1774
"0123456789"
1775
"_.-");
1776
if((direntry->d_name)[sret] != '\0'){
1777
/* Contains non-allowed characters */
1778
if(debug){
1779
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1780
direntry->d_name);
1781
}
1782
return 0;
1783
}
1784
1785
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1786
if(ret == -1){
1787
if(debug){
1788
perror_plus("Could not stat hook");
1789
}
1790
return 0;
1791
}
1792
if(not (S_ISREG(st.st_mode))){
1793
/* Not a regular file */
1794
if(debug){
1795
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1796
direntry->d_name);
1797
}
1798
return 0;
1799
}
1800
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1801
/* Not executable */
1802
if(debug){
1803
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1804
direntry->d_name);
1805
}
1806
return 0;
1807
}
1808
if(debug){
1809
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1810
direntry->d_name);
1811
}
1812
return 1;
1813
}
1814
1815
__attribute__((nonnull, warn_unused_result))
1816
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1817
mandos_context *mc){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1818
1204
int ret;
1819
1205
struct timespec now;
1820
1206
struct timespec waited_time;
1821
1207
intmax_t block_time;
1822
1208
1823
1209
while(true){
1824
if(mc->current_server == NULL){
1825
if(debug){
1826
fprintf_plus(stderr, "Wait until first server is found."
1827
" No timeout!\n");
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1828
1213
}
1829
1214
ret = avahi_simple_poll_iterate(s, -1);
1830
1215
} else {
1831
if(debug){
1832
fprintf_plus(stderr, "Check current_server if we should run"
1833
" it, or wait\n");
1216
if (debug){
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1834
1218
}
1835
1219
/* the current time */
1836
1220
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1840
1224
}
1841
1225
/* Calculating in ms how long time between now and server
1842
1226
who we visted longest time ago. Now - last seen. */
1843
waited_time.tv_sec = (now.tv_sec
1844
- mc->current_server->last_seen.tv_sec);
1845
waited_time.tv_nsec = (now.tv_nsec
1846
- mc->current_server->last_seen.tv_nsec);
1847
/* total time is 10s/10,000ms.
1848
Converting to s from ms by dividing by 1,000,
1849
and ns to ms by dividing by 1,000,000. */
1850
block_time = ((retry_interval
1851
- ((intmax_t)waited_time.tv_sec * 1000))
1852
- ((intmax_t)waited_time.tv_nsec / 1000000));
1853
1854
if(debug){
1855
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1856
block_time);
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1231
1232
if (debug){
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1857
1234
}
1858
1235
1859
1236
if(block_time <= 0){
1860
ret = start_mandos_communication(mc->current_server->ip,
1861
mc->current_server->port,
1862
mc->current_server->if_index,
1863
mc->current_server->af, mc);
1237
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1864
1241
if(ret == 0){
1865
avahi_simple_poll_quit(s);
1242
avahi_simple_poll_quit(mc.simple_poll);
1866
1243
return 0;
1867
1244
}
1868
ret = clock_gettime(CLOCK_MONOTONIC,
1869
&mc->current_server->last_seen);
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1870
1246
if(ret == -1){
1871
1247
perror_plus("clock_gettime");
1872
1248
return -1;
1873
1249
}
1874
mc->current_server = mc->current_server->next;
1875
block_time = 0; /* Call avahi to find new Mandos
1876
servers, but don't block */
1250
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1877
1252
}
1878
1253
1879
1254
ret = avahi_simple_poll_iterate(s, (int)block_time);
1880
1255
}
1881
1256
if(ret != 0){
1882
if(ret > 0 or errno != EINTR){
1257
if (ret > 0 or errno != EINTR) {
1883
1258
return (ret != 1) ? ret : 0;
1884
1259
}
1885
1260
}
1886
1261
}
1887
1262
}
1888
1263
1889
__attribute__((nonnull))
1890
void run_network_hooks(const char *mode, const char *interface,
1891
const float delay){
1892
struct dirent **direntries = NULL;
1893
if(hookdir_fd == -1){
1894
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1895
| O_CLOEXEC);
1896
if(hookdir_fd == -1){
1897
if(errno == ENOENT){
1898
if(debug){
1899
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1900
" found\n", hookdir);
1901
}
1902
} else {
1903
perror_plus("open");
1904
}
1905
return;
1906
}
1907
}
1908
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1909
runnable_hook, alphasort);
1910
if(numhooks == -1){
1911
perror_plus("scandir");
1912
return;
1913
}
1914
struct dirent *direntry;
1915
int ret;
1916
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1917
if(devnull == -1){
1918
perror_plus("open(\"/dev/null\", O_RDONLY)");
1919
return;
1920
}
1921
for(int i = 0; i < numhooks; i++){
1922
direntry = direntries[i];
1923
if(debug){
1924
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1925
direntry->d_name);
1926
}
1927
pid_t hook_pid = fork();
1928
if(hook_pid == 0){
1929
/* Child */
1930
/* Raise privileges */
1931
errno = raise_privileges_permanently();
1932
if(errno != 0){
1933
perror_plus("Failed to raise privileges");
1934
_exit(EX_NOPERM);
1935
}
1936
/* Set group */
1937
errno = 0;
1938
ret = setgid(0);
1939
if(ret == -1){
1940
perror_plus("setgid");
1941
_exit(EX_NOPERM);
1942
}
1943
/* Reset supplementary groups */
1944
errno = 0;
1945
ret = setgroups(0, NULL);
1946
if(ret == -1){
1947
perror_plus("setgroups");
1948
_exit(EX_NOPERM);
1949
}
1950
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1951
if(ret == -1){
1952
perror_plus("setenv");
1953
_exit(EX_OSERR);
1954
}
1955
ret = setenv("DEVICE", interface, 1);
1956
if(ret == -1){
1957
perror_plus("setenv");
1958
_exit(EX_OSERR);
1959
}
1960
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1961
if(ret == -1){
1962
perror_plus("setenv");
1963
_exit(EX_OSERR);
1964
}
1965
ret = setenv("MODE", mode, 1);
1966
if(ret == -1){
1967
perror_plus("setenv");
1968
_exit(EX_OSERR);
1969
}
1970
char *delaystring;
1971
ret = asprintf(&delaystring, "%f", (double)delay);
1972
if(ret == -1){
1973
perror_plus("asprintf");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("DELAY", delaystring, 1);
1977
if(ret == -1){
1978
free(delaystring);
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
free(delaystring);
1983
if(connect_to != NULL){
1984
ret = setenv("CONNECT", connect_to, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
}
1990
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1991
direntry->d_name,
1992
O_RDONLY));
1993
if(hook_fd == -1){
1994
perror_plus("openat");
1995
_exit(EXIT_FAILURE);
1996
}
1997
if(close(hookdir_fd) == -1){
1998
perror_plus("close");
1999
_exit(EXIT_FAILURE);
2000
}
2001
ret = dup2(devnull, STDIN_FILENO);
2002
if(ret == -1){
2003
perror_plus("dup2(devnull, STDIN_FILENO)");
2004
_exit(EX_OSERR);
2005
}
2006
ret = close(devnull);
2007
if(ret == -1){
2008
perror_plus("close");
2009
_exit(EX_OSERR);
2010
}
2011
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2012
if(ret == -1){
2013
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2014
_exit(EX_OSERR);
2015
}
2016
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2017
environ) == -1){
2018
perror_plus("fexecve");
2019
_exit(EXIT_FAILURE);
2020
}
2021
} else {
2022
if(hook_pid == -1){
2023
perror_plus("fork");
2024
free(direntry);
2025
continue;
2026
}
2027
int status;
2028
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2029
perror_plus("waitpid");
2030
free(direntry);
2031
continue;
2032
}
2033
if(WIFEXITED(status)){
2034
if(WEXITSTATUS(status) != 0){
2035
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2036
" with status %d\n", direntry->d_name,
2037
WEXITSTATUS(status));
2038
free(direntry);
2039
continue;
2040
}
2041
} else if(WIFSIGNALED(status)){
2042
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2043
" signal %d\n", direntry->d_name,
2044
WTERMSIG(status));
2045
free(direntry);
2046
continue;
2047
} else {
2048
fprintf_plus(stderr, "Warning: network hook \"%s\""
2049
" crashed\n", direntry->d_name);
2050
free(direntry);
2051
continue;
2052
}
2053
}
2054
if(debug){
2055
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2056
direntry->d_name);
2057
}
2058
free(direntry);
2059
}
2060
free(direntries);
2061
if(close(hookdir_fd) == -1){
2062
perror_plus("close");
2063
} else {
2064
hookdir_fd = -1;
2065
}
2066
close(devnull);
2067
}
2068
2069
__attribute__((nonnull, warn_unused_result))
2070
error_t bring_up_interface(const char *const interface,
2071
const float delay){
2072
error_t old_errno = errno;
2073
int ret;
2074
struct ifreq network;
2075
unsigned int if_index = if_nametoindex(interface);
2076
if(if_index == 0){
2077
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2078
errno = old_errno;
2079
return ENXIO;
2080
}
2081
2082
if(quit_now){
2083
errno = old_errno;
2084
return EINTR;
2085
}
2086
2087
if(not interface_is_up(interface)){
2088
error_t ret_errno = 0, ioctl_errno = 0;
2089
if(not get_flags(interface, &network)){
2090
ret_errno = errno;
2091
fprintf_plus(stderr, "Failed to get flags for interface "
2092
"\"%s\"\n", interface);
2093
errno = old_errno;
2094
return ret_errno;
2095
}
2096
network.ifr_flags |= IFF_UP; /* set flag */
2097
2098
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2099
if(sd == -1){
2100
ret_errno = errno;
2101
perror_plus("socket");
2102
errno = old_errno;
2103
return ret_errno;
2104
}
2105
2106
if(quit_now){
2107
ret = close(sd);
2108
if(ret == -1){
2109
perror_plus("close");
2110
}
2111
errno = old_errno;
2112
return EINTR;
2113
}
2114
2115
if(debug){
2116
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2117
interface);
2118
}
2119
2120
/* Raise privileges */
2121
ret_errno = raise_privileges();
2122
if(ret_errno != 0){
2123
errno = ret_errno;
2124
perror_plus("Failed to raise privileges");
2125
}
2126
2127
#ifdef __linux__
2128
int ret_linux;
2129
bool restore_loglevel = false;
2130
if(ret_errno == 0){
2131
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2132
messages about the network interface to mess up the prompt */
2133
ret_linux = klogctl(8, NULL, 5);
2134
if(ret_linux == -1){
2135
perror_plus("klogctl");
2136
} else {
2137
restore_loglevel = true;
2138
}
2139
}
2140
#endif /* __linux__ */
2141
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2142
ioctl_errno = errno;
2143
#ifdef __linux__
2144
if(restore_loglevel){
2145
ret_linux = klogctl(7, NULL, 0);
2146
if(ret_linux == -1){
2147
perror_plus("klogctl");
2148
}
2149
}
2150
#endif /* __linux__ */
2151
2152
/* If raise_privileges() succeeded above */
2153
if(ret_errno == 0){
2154
/* Lower privileges */
2155
ret_errno = lower_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to lower privileges");
2159
}
2160
}
2161
2162
/* Close the socket */
2163
ret = close(sd);
2164
if(ret == -1){
2165
perror_plus("close");
2166
}
2167
2168
if(ret_setflags == -1){
2169
errno = ioctl_errno;
2170
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2171
errno = old_errno;
2172
return ioctl_errno;
2173
}
2174
} else if(debug){
2175
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2176
interface);
2177
}
2178
2179
/* Sleep checking until interface is running.
2180
Check every 0.25s, up to total time of delay */
2181
for(int i=0; i < delay * 4; i++){
2182
if(interface_is_running(interface)){
2183
break;
2184
}
2185
struct timespec sleeptime = { .tv_nsec = 250000000 };
2186
ret = nanosleep(&sleeptime, NULL);
2187
if(ret == -1 and errno != EINTR){
2188
perror_plus("nanosleep");
2189
}
2190
}
2191
2192
errno = old_errno;
2193
return 0;
2194
}
2195
2196
__attribute__((nonnull, warn_unused_result))
2197
error_t take_down_interface(const char *const interface){
2198
error_t old_errno = errno;
2199
struct ifreq network;
2200
unsigned int if_index = if_nametoindex(interface);
2201
if(if_index == 0){
2202
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2203
errno = old_errno;
2204
return ENXIO;
2205
}
2206
if(interface_is_up(interface)){
2207
error_t ret_errno = 0, ioctl_errno = 0;
2208
if(not get_flags(interface, &network) and debug){
2209
ret_errno = errno;
2210
fprintf_plus(stderr, "Failed to get flags for interface "
2211
"\"%s\"\n", interface);
2212
errno = old_errno;
2213
return ret_errno;
2214
}
2215
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2216
2217
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2218
if(sd == -1){
2219
ret_errno = errno;
2220
perror_plus("socket");
2221
errno = old_errno;
2222
return ret_errno;
2223
}
2224
2225
if(debug){
2226
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2227
interface);
2228
}
2229
2230
/* Raise privileges */
2231
ret_errno = raise_privileges();
2232
if(ret_errno != 0){
2233
errno = ret_errno;
2234
perror_plus("Failed to raise privileges");
2235
}
2236
2237
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2238
ioctl_errno = errno;
2239
2240
/* If raise_privileges() succeeded above */
2241
if(ret_errno == 0){
2242
/* Lower privileges */
2243
ret_errno = lower_privileges();
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("Failed to lower privileges");
2247
}
2248
}
2249
2250
/* Close the socket */
2251
int ret = close(sd);
2252
if(ret == -1){
2253
perror_plus("close");
2254
}
2255
2256
if(ret_setflags == -1){
2257
errno = ioctl_errno;
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2259
errno = old_errno;
2260
return ioctl_errno;
2261
}
2262
} else if(debug){
2263
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2264
interface);
2265
}
2266
2267
errno = old_errno;
2268
return 0;
2269
}
2270
2271
1264
int main(int argc, char *argv[]){
2272
mandos_context mc = { .server = NULL, .dh_bits = 0,
2273
.priority = "SECURE256:!CTYPE-X.509"
2274
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2275
.current_server = NULL, .interfaces = NULL,
2276
.interfaces_size = 0 };
2277
1265
AvahiSServiceBrowser *sb = NULL;
2278
error_t ret_errno;
1266
int error;
2279
1267
int ret;
2280
1268
intmax_t tmpmax;
2281
1269
char *tmp;
2282
1270
int exitcode = EXIT_SUCCESS;
2283
char *interfaces_to_take_down = NULL;
2284
size_t interfaces_to_take_down_size = 0;
2285
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2286
char old_tempdir[] = "/tmp/mandosXXXXXX";
2287
char *tempdir = NULL;
1271
const char *interface = "";
1272
struct ifreq network;
1273
int sd = -1;
1274
bool take_down_interface = false;
1275
uid_t uid;
1276
gid_t gid;
1277
char tempdir[] = "/tmp/mandosXXXXXX";
1278
bool tempdir_created = false;
2288
1279
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2289
1280
const char *seckey = PATHDIR "/" SECKEY;
2290
1281
const char *pubkey = PATHDIR "/" PUBKEY;
2291
const char *dh_params_file = NULL;
2292
char *interfaces_hooks = NULL;
2293
1282
2294
1283
bool gnutls_initialized = false;
2295
1284
bool gpgme_initialized = false;
2296
1285
float delay = 2.5f;
2297
double retry_interval = 10; /* 10s between trying a server and
2298
retrying the same server again */
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
2299
1287
2300
1288
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2301
1289
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2347
1335
.doc = "Bit length of the prime number used in the"
2348
1336
" Diffie-Hellman key exchange",
2349
1337
.group = 2 },
2350
{ .name = "dh-params", .key = 134,
2351
.arg = "FILE",
2352
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2353
" for the Diffie-Hellman key exchange",
2354
.group = 2 },
2355
1338
{ .name = "priority", .key = 130,
2356
1339
.arg = "STRING",
2357
1340
.doc = "GnuTLS priority string for the TLS handshake",
2362
1345
.group = 2 },
2363
1346
{ .name = "retry", .key = 132,
2364
1347
.arg = "SECONDS",
2365
.doc = "Retry interval used when denied by the Mandos server",
2366
.group = 2 },
2367
{ .name = "network-hook-dir", .key = 133,
2368
.arg = "DIR",
2369
.doc = "Directory where network hooks are located",
1348
.doc = "Retry interval used when denied by the mandos server",
2370
1349
.group = 2 },
2371
1350
/*
2372
1351
* These reproduce what we would get without ARGP_NO_HELP
2391
1370
connect_to = arg;
2392
1371
break;
2393
1372
case 'i': /* --interface */
2394
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2395
arg, (int)',');
2396
if(ret_errno != 0){
2397
argp_error(state, "%s", strerror(ret_errno));
2398
}
1373
interface = arg;
2399
1374
break;
2400
1375
case 's': /* --seckey */
2401
1376
seckey = arg;
2412
1387
}
2413
1388
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2414
1389
break;
2415
case 134: /* --dh-params */
2416
dh_params_file = arg;
2417
break;
2418
1390
case 130: /* --priority */
2419
1391
mc.priority = arg;
2420
1392
break;
2428
1400
errno = 0;
2429
1401
retry_interval = strtod(arg, &tmp);
2430
1402
if(errno != 0 or tmp == arg or *tmp != '\0'
2431
or (retry_interval * 1000) > INT_MAX
2432
or retry_interval < 0){
1403
or (retry_interval * 1000) > INT_MAX){
2433
1404
argp_error(state, "Bad retry interval");
2434
1405
}
2435
1406
break;
2436
case 133: /* --network-hook-dir */
2437
hookdir = arg;
2438
break;
2439
1407
/*
2440
1408
* These reproduce what we would get without ARGP_NO_HELP
2441
1409
*/
2447
1415
argp_state_help(state, state->out_stream,
2448
1416
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2449
1417
case 'V': /* --version */
2450
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
2451
1419
exit(argp_err_exit_status);
2452
1420
break;
2453
1421
default:
2477
1445
}
2478
1446
}
2479
1447
2480
{
2481
/* Work around Debian bug #633582:
2482
<http://bugs.debian.org/633582> */
2483
2484
/* Re-raise privileges */
2485
ret_errno = raise_privileges();
2486
if(ret_errno != 0){
2487
errno = ret_errno;
2488
perror_plus("Failed to raise privileges");
2489
} else {
2490
struct stat st;
2491
2492
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2493
int seckey_fd = open(seckey, O_RDONLY);
2494
if(seckey_fd == -1){
2495
perror_plus("open");
2496
} else {
2497
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2498
if(ret == -1){
2499
perror_plus("fstat");
2500
} else {
2501
if(S_ISREG(st.st_mode)
2502
and st.st_uid == 0 and st.st_gid == 0){
2503
ret = fchown(seckey_fd, uid, gid);
2504
if(ret == -1){
2505
perror_plus("fchown");
2506
}
2507
}
2508
}
2509
close(seckey_fd);
2510
}
2511
}
2512
2513
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2514
int pubkey_fd = open(pubkey, O_RDONLY);
2515
if(pubkey_fd == -1){
2516
perror_plus("open");
2517
} else {
2518
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2519
if(ret == -1){
2520
perror_plus("fstat");
2521
} else {
2522
if(S_ISREG(st.st_mode)
2523
and st.st_uid == 0 and st.st_gid == 0){
2524
ret = fchown(pubkey_fd, uid, gid);
2525
if(ret == -1){
2526
perror_plus("fchown");
2527
}
2528
}
2529
}
2530
close(pubkey_fd);
2531
}
2532
}
2533
2534
if(dh_params_file != NULL
2535
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2536
int dhparams_fd = open(dh_params_file, O_RDONLY);
2537
if(dhparams_fd == -1){
2538
perror_plus("open");
2539
} else {
2540
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2541
if(ret == -1){
2542
perror_plus("fstat");
2543
} else {
2544
if(S_ISREG(st.st_mode)
2545
and st.st_uid == 0 and st.st_gid == 0){
2546
ret = fchown(dhparams_fd, uid, gid);
2547
if(ret == -1){
2548
perror_plus("fchown");
2549
}
2550
}
2551
}
2552
close(dhparams_fd);
2553
}
2554
}
2555
2556
/* Lower privileges */
2557
ret_errno = lower_privileges();
2558
if(ret_errno != 0){
2559
errno = ret_errno;
2560
perror_plus("Failed to lower privileges");
2561
}
2562
}
2563
}
2564
2565
/* Remove invalid interface names (except "none") */
2566
{
2567
char *interface = NULL;
2568
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2569
interface))){
2570
if(strcmp(interface, "none") != 0
2571
and if_nametoindex(interface) == 0){
2572
if(interface[0] != '\0'){
2573
fprintf_plus(stderr, "Not using nonexisting interface"
2574
" \"%s\"\n", interface);
2575
}
2576
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2577
interface = NULL;
2578
}
2579
}
2580
}
2581
2582
/* Run network hooks */
2583
{
2584
if(mc.interfaces != NULL){
2585
interfaces_hooks = malloc(mc.interfaces_size);
2586
if(interfaces_hooks == NULL){
2587
perror_plus("malloc");
2588
goto end;
2589
}
2590
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2591
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2592
}
2593
run_network_hooks("start", interfaces_hooks != NULL ?
2594
interfaces_hooks : "", delay);
2595
}
2596
2597
1448
if(not debug){
2598
1449
avahi_set_log_function(empty_log);
2599
1450
}
1451
1452
if(interface[0] == '\0'){
1453
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1455
alphasort);
1456
if(ret >= 1){
1457
/* Pick the first good interface */
1458
interface = strdup(direntries[0]->d_name);
1459
if(debug){
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1461
}
1462
if(interface == NULL){
1463
perror_plus("malloc");
1464
free(direntries);
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
free(direntries);
1469
} else {
1470
free(direntries);
1471
fprintf(stderr, "Could not find a network interface\n");
1472
exitcode = EXIT_FAILURE;
1473
goto end;
1474
}
1475
}
2600
1476
2601
1477
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2602
1478
from the signal handler */
2603
1479
/* Initialize the pseudo-RNG for Avahi */
2604
1480
srand((unsigned int) time(NULL));
2605
simple_poll = avahi_simple_poll_new();
2606
if(simple_poll == NULL){
2607
fprintf_plus(stderr,
2608
"Avahi: Failed to create simple poll object.\n");
1481
mc.simple_poll = avahi_simple_poll_new();
1482
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2609
1484
exitcode = EX_UNAVAILABLE;
2610
1485
goto end;
2611
1486
}
2673
1548
}
2674
1549
}
2675
1550
2676
/* If no interfaces were specified, make a list */
2677
if(mc.interfaces == NULL){
2678
struct dirent **direntries = NULL;
2679
/* Look for any good interfaces */
2680
ret = scandir(sys_class_net, &direntries, good_interface,
2681
alphasort);
2682
if(ret >= 1){
2683
/* Add all found interfaces to interfaces list */
2684
for(int i = 0; i < ret; ++i){
2685
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2686
direntries[i]->d_name);
2687
if(ret_errno != 0){
2688
errno = ret_errno;
2689
perror_plus("argz_add");
2690
free(direntries[i]);
2691
continue;
2692
}
2693
if(debug){
2694
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2695
direntries[i]->d_name);
2696
}
2697
free(direntries[i]);
2698
}
2699
free(direntries);
1551
/* If the interface is down, bring it up */
1552
if(strcmp(interface, "none") != 0){
1553
if_index = (AvahiIfIndex) if_nametoindex(interface);
1554
if(if_index == 0){
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1556
exitcode = EX_UNAVAILABLE;
1557
goto end;
1558
}
1559
1560
if(quit_now){
1561
goto end;
1562
}
1563
1564
/* Re-raise priviliges */
1565
errno = 0;
1566
ret = seteuid(0);
1567
if(ret == -1){
1568
perror_plus("seteuid");
1569
}
1570
1571
#ifdef __linux__
1572
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1573
messages about the network interface to mess up the prompt */
1574
ret = klogctl(8, NULL, 5);
1575
bool restore_loglevel = true;
1576
if(ret == -1){
1577
restore_loglevel = false;
1578
perror_plus("klogctl");
1579
}
1580
#endif /* __linux__ */
1581
1582
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1583
if(sd < 0){
1584
perror_plus("socket");
1585
exitcode = EX_OSERR;
1586
#ifdef __linux__
1587
if(restore_loglevel){
1588
ret = klogctl(7, NULL, 0);
1589
if(ret == -1){
1590
perror_plus("klogctl");
1591
}
1592
}
1593
#endif /* __linux__ */
1594
/* Lower privileges */
1595
errno = 0;
1596
ret = seteuid(uid);
1597
if(ret == -1){
1598
perror_plus("seteuid");
1599
}
1600
goto end;
1601
}
1602
strcpy(network.ifr_name, interface);
1603
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1604
if(ret == -1){
1605
perror_plus("ioctl SIOCGIFFLAGS");
1606
#ifdef __linux__
1607
if(restore_loglevel){
1608
ret = klogctl(7, NULL, 0);
1609
if(ret == -1){
1610
perror_plus("klogctl");
1611
}
1612
}
1613
#endif /* __linux__ */
1614
exitcode = EX_OSERR;
1615
/* Lower privileges */
1616
errno = 0;
1617
ret = seteuid(uid);
1618
if(ret == -1){
1619
perror_plus("seteuid");
1620
}
1621
goto end;
1622
}
1623
if((network.ifr_flags & IFF_UP) == 0){
1624
network.ifr_flags |= IFF_UP;
1625
take_down_interface = true;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
if(ret == -1){
1628
take_down_interface = false;
1629
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
exitcode = EX_OSERR;
1631
#ifdef __linux__
1632
if(restore_loglevel){
1633
ret = klogctl(7, NULL, 0);
1634
if(ret == -1){
1635
perror_plus("klogctl");
1636
}
1637
}
1638
#endif /* __linux__ */
1639
/* Lower privileges */
1640
errno = 0;
1641
ret = seteuid(uid);
1642
if(ret == -1){
1643
perror_plus("seteuid");
1644
}
1645
goto end;
1646
}
1647
}
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1649
for(int i=0; i < delay * 4; i++){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_RUNNING){
1654
break;
1655
}
1656
struct timespec sleeptime = { .tv_nsec = 250000000 };
1657
ret = nanosleep(&sleeptime, NULL);
1658
if(ret == -1 and errno != EINTR){
1659
perror_plus("nanosleep");
1660
}
1661
}
1662
if(not take_down_interface){
1663
/* We won't need the socket anymore */
1664
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1665
if(ret == -1){
1666
perror_plus("close");
1667
}
1668
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1673
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
1676
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
errno = 0;
1680
if(take_down_interface){
1681
/* Lower privileges */
1682
ret = seteuid(uid);
1683
if(ret == -1){
1684
perror_plus("seteuid");
1685
}
2700
1686
} else {
2701
if(ret == 0){
2702
free(direntries);
2703
}
2704
fprintf_plus(stderr, "Could not find a network interface\n");
2705
exitcode = EXIT_FAILURE;
2706
goto end;
2707
}
2708
}
2709
2710
/* Bring up interfaces which are down, and remove any "none"s */
2711
{
2712
char *interface = NULL;
2713
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2714
interface))){
2715
/* If interface name is "none", stop bringing up interfaces.
2716
Also remove all instances of "none" from the list */
2717
if(strcmp(interface, "none") == 0){
2718
argz_delete(&mc.interfaces, &mc.interfaces_size,
2719
interface);
2720
interface = NULL;
2721
while((interface = argz_next(mc.interfaces,
2722
mc.interfaces_size, interface))){
2723
if(strcmp(interface, "none") == 0){
2724
argz_delete(&mc.interfaces, &mc.interfaces_size,
2725
interface);
2726
interface = NULL;
2727
}
2728
}
2729
break;
2730
}
2731
bool interface_was_up = interface_is_up(interface);
2732
errno = bring_up_interface(interface, delay);
2733
if(not interface_was_up){
2734
if(errno != 0){
2735
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2736
" %s\n", interface, strerror(errno));
2737
} else {
2738
errno = argz_add(&interfaces_to_take_down,
2739
&interfaces_to_take_down_size,
2740
interface);
2741
if(errno != 0){
2742
perror_plus("argz_add");
2743
}
2744
}
2745
}
2746
}
2747
if(debug and (interfaces_to_take_down == NULL)){
2748
fprintf_plus(stderr, "No interfaces were brought up\n");
2749
}
2750
}
2751
2752
/* If we only got one interface, explicitly use only that one */
2753
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2754
if(debug){
2755
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2756
mc.interfaces);
2757
}
2758
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1687
/* Lower privileges permanently */
1688
ret = setuid(uid);
1689
if(ret == -1){
1690
perror_plus("setuid");
1691
}
1692
}
2759
1693
}
2760
1694
2761
1695
if(quit_now){
2762
1696
goto end;
2763
1697
}
2764
1698
2765
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1699
ret = init_gnutls_global(pubkey, seckey);
2766
1700
if(ret == -1){
2767
fprintf_plus(stderr, "init_gnutls_global failed\n");
1701
fprintf(stderr, "init_gnutls_global failed\n");
2768
1702
exitcode = EX_UNAVAILABLE;
2769
1703
goto end;
2770
1704
} else {
2775
1709
goto end;
2776
1710
}
2777
1711
2778
/* Try /run/tmp before /tmp */
2779
tempdir = mkdtemp(run_tempdir);
2780
if(tempdir == NULL and errno == ENOENT){
2781
if(debug){
2782
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2783
run_tempdir, old_tempdir);
2784
}
2785
tempdir = mkdtemp(old_tempdir);
2786
}
2787
if(tempdir == NULL){
1712
if(mkdtemp(tempdir) == NULL){
2788
1713
perror_plus("mkdtemp");
2789
1714
goto end;
2790
1715
}
1716
tempdir_created = true;
2791
1717
2792
1718
if(quit_now){
2793
1719
goto end;
2794
1720
}
2795
1721
2796
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2797
fprintf_plus(stderr, "init_gpgme failed\n");
1722
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
2798
1724
exitcode = EX_UNAVAILABLE;
2799
1725
goto end;
2800
1726
} else {
2809
1735
/* Connect directly, do not use Zeroconf */
2810
1736
/* (Mainly meant for debugging) */
2811
1737
char *address = strrchr(connect_to, ':');
2812
2813
1738
if(address == NULL){
2814
fprintf_plus(stderr, "No colon in address\n");
1739
fprintf(stderr, "No colon in address\n");
2815
1740
exitcode = EX_USAGE;
2816
1741
goto end;
2817
1742
}
2820
1745
goto end;
2821
1746
}
2822
1747
2823
in_port_t port;
1748
uint16_t port;
2824
1749
errno = 0;
2825
1750
tmpmax = strtoimax(address+1, &tmp, 10);
2826
1751
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2827
or tmpmax != (in_port_t)tmpmax){
2828
fprintf_plus(stderr, "Bad port number\n");
1752
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
2829
1754
exitcode = EX_USAGE;
2830
1755
goto end;
2831
1756
}
2832
1757
2833
1758
if(quit_now){
2834
1759
goto end;
2835
1760
}
2836
1761
2837
port = (in_port_t)tmpmax;
1762
port = (uint16_t)tmpmax;
2838
1763
*address = '\0';
1764
address = connect_to;
2839
1765
/* Colon in address indicates IPv6 */
2840
1766
int af;
2841
if(strchr(connect_to, ':') != NULL){
1767
if(strchr(address, ':') != NULL){
2842
1768
af = AF_INET6;
2843
/* Accept [] around IPv6 address - see RFC 5952 */
2844
if(connect_to[0] == '[' and address[-1] == ']')
2845
{
2846
connect_to++;
2847
address[-1] = '\0';
2848
}
2849
1769
} else {
2850
1770
af = AF_INET;
2851
1771
}
2852
address = connect_to;
2853
1772
2854
1773
if(quit_now){
2855
1774
goto end;
2856
1775
}
2857
1776
2858
1777
while(not quit_now){
2859
ret = start_mandos_communication(address, port, if_index, af,
2860
&mc);
1778
ret = start_mandos_communication(address, port, if_index, af);
2861
1779
if(quit_now or ret == 0){
2862
1780
break;
2863
1781
}
2864
if(debug){
2865
fprintf_plus(stderr, "Retrying in %d seconds\n",
2866
(int)retry_interval);
2867
}
2868
sleep((unsigned int)retry_interval);
2869
}
2870
2871
if(not quit_now){
1782
sleep((int)retry_interval or 1);
1783
};
1784
1785
if (not quit_now){
2872
1786
exitcode = EXIT_SUCCESS;
2873
1787
}
2874
1788
2875
1789
goto end;
2876
1790
}
2877
1791
2889
1803
config.publish_domain = 0;
2890
1804
2891
1805
/* Allocate a new server */
2892
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2893
&config, NULL, NULL, &ret_errno);
1806
mc.server = avahi_server_new(avahi_simple_poll_get
1807
(mc.simple_poll), &config, NULL,
1808
NULL, &error);
2894
1809
2895
1810
/* Free the Avahi configuration data */
2896
1811
avahi_server_config_free(&config);
2898
1813
2899
1814
/* Check if creating the Avahi server object succeeded */
2900
1815
if(mc.server == NULL){
2901
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2902
avahi_strerror(ret_errno));
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
2903
1818
exitcode = EX_UNAVAILABLE;
2904
1819
goto end;
2905
1820
}
2911
1826
/* Create the Avahi service browser */
2912
1827
sb = avahi_s_service_browser_new(mc.server, if_index,
2913
1828
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2914
NULL, 0, browse_callback,
2915
(void *)&mc);
1829
NULL, 0, browse_callback, NULL);
2916
1830
if(sb == NULL){
2917
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2918
avahi_strerror(avahi_server_errno(mc.server)));
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
2919
1833
exitcode = EX_UNAVAILABLE;
2920
1834
goto end;
2921
1835
}
2927
1841
/* Run the main loop */
2928
1842
2929
1843
if(debug){
2930
fprintf_plus(stderr, "Starting Avahi loop search\n");
1844
fprintf(stderr, "Starting Avahi loop search\n");
2931
1845
}
2932
2933
ret = avahi_loop_with_timeout(simple_poll,
2934
(int)(retry_interval * 1000), &mc);
1846
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
2935
1848
if(debug){
2936
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2937
(ret == 0) ? "successfully" : "with error");
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
2938
1851
}
2939
1852
2940
1853
end:
2941
1854
2942
1855
if(debug){
2943
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1856
fprintf(stderr, "%s exiting\n", argv[0]);
2944
1857
}
2945
1858
2946
1859
/* Cleanup things */
2947
free(mc.interfaces);
2948
2949
1860
if(sb != NULL)
2950
1861
avahi_s_service_browser_free(sb);
2951
1862
2952
1863
if(mc.server != NULL)
2953
1864
avahi_server_free(mc.server);
2954
1865
2955
if(simple_poll != NULL)
2956
avahi_simple_poll_free(simple_poll);
1866
if(mc.simple_poll != NULL)
1867
avahi_simple_poll_free(mc.simple_poll);
2957
1868
2958
1869
if(gnutls_initialized){
2959
1870
gnutls_certificate_free_credentials(mc.cred);
1871
gnutls_global_deinit();
2960
1872
gnutls_dh_params_deinit(mc.dh_params);
2961
1873
}
2962
1874
2963
1875
if(gpgme_initialized){
2964
1876
gpgme_release(mc.ctx);
2965
1877
}
2966
2967
/* Cleans up the circular linked list of Mandos servers the client
2968
has seen */
1878
1879
/* cleans up the circular linked list of mandos servers the client has seen */
2969
1880
if(mc.current_server != NULL){
2970
1881
mc.current_server->prev->next = NULL;
2971
1882
while(mc.current_server != NULL){
2972
1883
server *next = mc.current_server->next;
2973
#ifdef __GNUC__
2974
#pragma GCC diagnostic push
2975
#pragma GCC diagnostic ignored "-Wcast-qual"
2976
#endif
2977
free((char *)(mc.current_server->ip));
2978
#ifdef __GNUC__
2979
#pragma GCC diagnostic pop
2980
#endif
2981
1884
free(mc.current_server);
2982
1885
mc.current_server = next;
2983
1886
}
2984
1887
}
2985
1888
2986
/* Re-raise privileges */
2987
{
2988
ret_errno = raise_privileges();
2989
if(ret_errno != 0){
2990
errno = ret_errno;
2991
perror_plus("Failed to raise privileges");
2992
} else {
2993
2994
/* Run network hooks */
2995
run_network_hooks("stop", interfaces_hooks != NULL ?
2996
interfaces_hooks : "", delay);
2997
2998
/* Take down the network interfaces which were brought up */
2999
{
3000
char *interface = NULL;
3001
while((interface=argz_next(interfaces_to_take_down,
3002
interfaces_to_take_down_size,
3003
interface))){
3004
ret_errno = take_down_interface(interface);
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3007
perror_plus("Failed to take down interface");
3008
}
3009
}
3010
if(debug and (interfaces_to_take_down == NULL)){
3011
fprintf_plus(stderr, "No interfaces needed to be taken"
3012
" down\n");
3013
}
3014
}
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
1892
errno = 0;
1893
ret = seteuid(0);
1894
if(ret == -1){
1895
perror_plus("seteuid");
3015
1896
}
3016
3017
ret_errno = lower_privileges_permanently();
3018
if(ret_errno != 0){
3019
errno = ret_errno;
3020
perror_plus("Failed to lower privileges permanently");
1897
if(geteuid() == 0){
1898
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1899
if(ret == -1){
1900
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
1902
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1904
if(ret == -1){
1905
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1906
}
1907
}
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
/* Lower privileges permanently */
1913
errno = 0;
1914
ret = setuid(uid);
1915
if(ret == -1){
1916
perror_plus("setuid");
1917
}
3021
1918
}
3022
1919
}
3023
1920
3024
free(interfaces_to_take_down);
3025
free(interfaces_hooks);
3026
3027
1921
/* Removes the GPGME temp directory and all files inside */
3028
if(tempdir != NULL){
1922
if(tempdir_created){
3029
1923
struct dirent **direntries = NULL;
3030
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3031
| O_NOFOLLOW
3032
| O_DIRECTORY
3033
| O_PATH));
3034
if(tempdir_fd == -1){
3035
perror_plus("open");
3036
} else {
3037
int numentries = scandirat(tempdir_fd, ".", &direntries,
3038
notdotentries, alphasort);
3039
if(numentries >= 0){
3040
for(int i = 0; i < numentries; i++){
3041
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3042
if(ret == -1){
3043
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3044
" \"%s\", 0): %s\n", tempdir,
3045
direntries[i]->d_name, strerror(errno));
3046
}
3047
free(direntries[i]);
3048
}
3049
3050
/* need to clean even if 0 because man page doesn't specify */
3051
free(direntries);
3052
if(numentries == -1){
3053
perror_plus("scandir");
3054
}
3055
ret = rmdir(tempdir);
3056
if(ret == -1 and errno != ENOENT){
3057
perror_plus("rmdir");
3058
}
1924
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1926
if (ret > 0){
1927
for(int i = 0; i < ret; i++){
1928
direntry = direntries[i];
1929
char *fullname = NULL;
1930
ret = asprintf(&fullname, "%s/%s", tempdir,
1931
direntry->d_name);
1932
if(ret < 0){
1933
perror_plus("asprintf");
1934
continue;
1935
}
1936
ret = remove(fullname);
1937
if(ret == -1){
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1939
strerror(errno));
1940
}
1941
free(fullname);
3059
1942
}
3060
close(tempdir_fd);
1943
}
1944
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
1946
free(direntries);
1947
if (ret == -1){
1948
perror_plus("scandir");
1949
}
1950
ret = rmdir(tempdir);
1951
if(ret == -1 and errno != ENOENT){
1952
perror_plus("rmdir");
3061
1953
}
3062
1954
}
3063
1955
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0