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» Revision
237.2.88
(compared to revision 237.7.416)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-02-25 12:20:01 UTC
- mto: (237.4.2 mandos-pipe-ipc) (24.1.137 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090225122001-ty7zobjk6snyo0o3
* plugins.d/mandos-client.c (start_mandos_communication): "sin6_family"
in the
"sockaddr_in6"
struct is a
"sa_family_t",
not
"uint16_t".
in the
"sockaddr_in6"
struct is a
"sa_family_t",
not
"uint16_t".
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
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*
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11
* Everything else is
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* Copyright © 2008-2016 Teddy Hogeborn
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* Copyright © 2008-2016 Björn Påhlsson
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* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 Björn Påhlsson
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*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Contact the authors at <mandos@recompile.se>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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30
*/
31
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/* Needed by GPGME, specifically gpgme_data_seek() */
33
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#ifndef _LARGEFILE_SOURCE
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#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
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#ifndef _FILE_OFFSET_BITS
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#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
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40
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
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#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
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
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#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
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#include <sys/ioctl.h> /* ioctl */
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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
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sockaddr_in6, PF_INET6,
54
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SOCK_STREAM, uid_t, gid_t, open(),
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opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
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#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
70
program_invocation_short_name */
71
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
72
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
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SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
76
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INET_ADDRSTRLEN, INET6_ADDRSTRLEN
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*/
78
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
79
getuid(), getgid(), seteuid(),
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
83
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#include <iso646.h> /* not, or, and */
84
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#include <argp.h> /* struct argp_option, error_t, struct
85
79
argp_state, struct argp,
86
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argp_parse(), ARGP_KEY_ARG,
87
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ARGP_KEY_END, ARGP_ERR_UNKNOWN */
88
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#include <signal.h> /* sigemptyset(), sigaddset(),
89
sigaction(), SIGTERM, sig_atomic_t,
90
raise() */
91
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
92
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
93
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
94
WEXITSTATUS(), WTERMSIG() */
95
#include <grp.h> /* setgroups() */
96
#include <argz.h> /* argz_add_sep(), argz_next(),
97
argz_delete(), argz_append(),
98
argz_stringify(), argz_add(),
99
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
102
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103
86
#ifdef __linux__
104
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#include <sys/klog.h> /* klogctl() */
122
105
init_gnutls_session(),
123
106
GNUTLS_* */
124
107
#include <gnutls/openpgp.h>
125
/* gnutls_certificate_set_openpgp_key_file(),
126
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
127
110
128
111
/* GPGME */
129
112
#include <gpgme.h> /* All GPGME types, constants and
137
120
#define PATHDIR "/conf/conf.d/mandos"
138
121
#define SECKEY "seckey.txt"
139
122
#define PUBKEY "pubkey.txt"
140
#define HOOKDIR "/lib/mandos/network-hooks.d"
141
123
142
124
bool debug = false;
143
125
static const char mandos_protocol_version[] = "1";
144
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const char *argp_program_version = "mandos-client " VERSION;
145
const char *argp_program_bug_address = "<mandos@recompile.se>";
146
static const char sys_class_net[] = "/sys/class/net";
147
char *connect_to = NULL;
148
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
150
uid_t uid = 65534;
151
gid_t gid = 65534;
152
153
/* Doubly linked list that need to be circularly linked when used */
154
typedef struct server{
155
const char *ip;
156
in_port_t port;
157
AvahiIfIndex if_index;
158
int af;
159
struct timespec last_seen;
160
struct server *next;
161
struct server *prev;
162
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
163
128
164
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/* Used for passing in values through the Avahi callback functions */
165
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
166
132
AvahiServer *server;
167
133
gnutls_certificate_credentials_t cred;
168
134
unsigned int dh_bits;
169
135
gnutls_dh_params_t dh_params;
170
136
const char *priority;
171
137
gpgme_ctx_t ctx;
172
server *current_server;
173
char *interfaces;
174
size_t interfaces_size;
175
138
} mandos_context;
176
139
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/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
179
180
sig_atomic_t quit_now = 0;
181
int signal_received = 0;
182
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/* Function to use when printing errors */
184
void perror_plus(const char *print_text){
185
int e = errno;
186
fprintf(stderr, "Mandos plugin %s: ",
187
program_invocation_short_name);
188
errno = e;
189
perror(print_text);
190
}
191
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
193
int fprintf_plus(FILE *stream, const char *format, ...){
194
va_list ap;
195
va_start (ap, format);
196
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
198
program_invocation_short_name));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
200
}
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
201
144
202
145
/*
203
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* Make additional room in "buffer" for at least BUFFER_SIZE more
204
147
* bytes. "buffer_capacity" is how much is currently allocated,
205
148
* "buffer_length" is how much is already used.
206
149
*/
207
__attribute__((nonnull, warn_unused_result))
208
150
size_t incbuffer(char **buffer, size_t buffer_length,
209
size_t buffer_capacity){
151
size_t buffer_capacity){
210
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
212
if(new_buf == NULL){
213
int old_errno = errno;
214
free(*buffer);
215
errno = old_errno;
216
*buffer = NULL;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
217
155
return 0;
218
156
}
219
*buffer = new_buf;
220
157
buffer_capacity += BUFFER_SIZE;
221
158
}
222
159
return buffer_capacity;
223
160
}
224
161
225
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
229
int ret;
230
server *new_server = malloc(sizeof(server));
231
if(new_server == NULL){
232
perror_plus("malloc");
233
return false;
234
}
235
*new_server = (server){ .ip = strdup(ip),
236
.port = port,
237
.if_index = if_index,
238
.af = af };
239
if(new_server->ip == NULL){
240
perror_plus("strdup");
241
free(new_server);
242
return false;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
256
return false;
257
}
258
/* Special case of first server */
259
if(*current_server == NULL){
260
new_server->next = new_server;
261
new_server->prev = new_server;
262
*current_server = new_server;
263
} else {
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
267
new_server->prev->next = new_server;
268
(*current_server)->prev = new_server;
269
}
270
return true;
271
}
272
273
162
/*
274
163
* Initialize GPGME.
275
164
*/
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
281
168
gpgme_error_t rc;
282
169
gpgme_engine_info_t engine_info;
283
170
171
284
172
/*
285
173
* Helper function to insert pub and seckey to the engine keyring.
286
174
*/
287
bool import_key(const char * const filename){
288
int ret;
175
bool import_key(const char *filename){
289
176
int fd;
290
177
gpgme_data_t pgp_data;
291
178
292
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
293
180
if(fd == -1){
294
perror_plus("open");
181
perror("open");
295
182
return false;
296
183
}
297
184
298
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
299
186
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
302
189
return false;
303
190
}
304
191
305
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
306
193
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
309
196
return false;
310
197
}
311
198
312
ret = close(fd);
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
200
if(ret == -1){
314
perror_plus("close");
201
perror("close");
315
202
}
316
203
gpgme_data_release(pgp_data);
317
204
return true;
318
205
}
319
206
320
207
if(debug){
321
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
322
209
}
323
210
324
211
/* Init GPGME */
325
212
gpgme_check_version(NULL);
326
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
327
214
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
329
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
330
217
return false;
331
218
}
332
219
333
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
334
221
rc = gpgme_get_engine_info(&engine_info);
335
222
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
337
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
338
225
return false;
339
226
}
340
227
while(engine_info != NULL){
346
233
engine_info = engine_info->next;
347
234
}
348
235
if(engine_info == NULL){
349
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
350
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
351
237
return false;
352
238
}
353
239
354
240
/* Create new GPGME "context" */
355
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
356
242
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
359
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
360
245
return false;
361
246
}
362
247
364
249
return false;
365
250
}
366
251
367
return true;
252
return true;
368
253
}
369
254
370
255
/*
371
256
* Decrypt OpenPGP data.
372
257
* Returns -1 on error
373
258
*/
374
__attribute__((nonnull, warn_unused_result))
375
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
376
260
size_t crypto_size,
377
char **plaintext,
378
mandos_context *mc){
261
char **plaintext){
379
262
gpgme_data_t dh_crypto, dh_plain;
380
263
gpgme_error_t rc;
381
264
ssize_t ret;
383
266
ssize_t plaintext_length = 0;
384
267
385
268
if(debug){
386
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
387
270
}
388
271
389
272
/* Create new GPGME data buffer from memory cryptotext */
390
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
391
274
0);
392
275
if(rc != GPG_ERR_NO_ERROR){
393
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
394
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
395
278
return -1;
396
279
}
397
280
398
281
/* Create new empty GPGME data buffer for the plaintext */
399
282
rc = gpgme_data_new(&dh_plain);
400
283
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "Mandos plugin mandos-client: "
402
"bad gpgme_data_new: %s: %s\n",
403
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
404
286
gpgme_data_release(dh_crypto);
405
287
return -1;
406
288
}
407
289
408
290
/* Decrypt data from the cryptotext data buffer to the plaintext
409
291
data buffer */
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
293
if(rc != GPG_ERR_NO_ERROR){
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
414
296
plaintext_length = -1;
415
297
if(debug){
416
298
gpgme_decrypt_result_t result;
417
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
418
300
if(result == NULL){
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
420
302
} else {
421
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
422
result->unsupported_algorithm);
423
fprintf_plus(stderr, "Wrong key usage: %u\n",
424
result->wrong_key_usage);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
425
307
if(result->file_name != NULL){
426
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
427
309
}
428
310
gpgme_recipient_t recipient;
429
311
recipient = result->recipients;
430
while(recipient != NULL){
431
fprintf_plus(stderr, "Public key algorithm: %s\n",
432
gpgme_pubkey_algo_name
433
(recipient->pubkey_algo));
434
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
435
fprintf_plus(stderr, "Secret key available: %s\n",
436
recipient->status == GPG_ERR_NO_SECKEY
437
? "No" : "Yes");
438
recipient = recipient->next;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
439
322
}
440
323
}
441
324
}
443
326
}
444
327
445
328
if(debug){
446
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
447
330
}
448
331
449
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
450
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
451
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
452
335
plaintext_length = -1;
453
336
goto decrypt_end;
454
337
}
456
339
*plaintext = NULL;
457
340
while(true){
458
341
plaintext_capacity = incbuffer(plaintext,
459
(size_t)plaintext_length,
460
plaintext_capacity);
342
(size_t)plaintext_length,
343
plaintext_capacity);
461
344
if(plaintext_capacity == 0){
462
perror_plus("incbuffer");
463
plaintext_length = -1;
464
goto decrypt_end;
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
465
348
}
466
349
467
350
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
472
355
break;
473
356
}
474
357
if(ret < 0){
475
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
476
359
plaintext_length = -1;
477
360
goto decrypt_end;
478
361
}
480
363
}
481
364
482
365
if(debug){
483
fprintf_plus(stderr, "Decrypted password is: ");
366
fprintf(stderr, "Decrypted password is: ");
484
367
for(ssize_t i = 0; i < plaintext_length; i++){
485
368
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
486
369
}
497
380
return plaintext_length;
498
381
}
499
382
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
509
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
386
if(ret == NULL)
387
ret = "(unknown)";
388
return ret;
511
389
}
512
390
513
391
/* GnuTLS log function callback */
514
__attribute__((nonnull))
515
392
static void debuggnutls(__attribute__((unused)) int level,
516
393
const char* string){
517
fprintf_plus(stderr, "GnuTLS: %s", string);
394
fprintf(stderr, "GnuTLS: %s", string);
518
395
}
519
396
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
521
397
static int init_gnutls_global(const char *pubkeyfilename,
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
mandos_context *mc){
398
const char *seckeyfilename){
525
399
int ret;
526
unsigned int uret;
527
400
528
401
if(debug){
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
402
fprintf(stderr, "Initializing GnuTLS\n");
403
}
404
405
ret = gnutls_global_init();
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
409
return -1;
530
410
}
531
411
532
412
if(debug){
538
418
}
539
419
540
420
/* OpenPGP credentials */
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
542
422
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
safer_gnutls_strerror(ret));
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
428
gnutls_global_deinit();
545
429
return -1;
546
430
}
547
431
548
432
if(debug){
549
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
550
" secret key %s as GnuTLS credentials\n",
551
pubkeyfilename,
552
seckeyfilename);
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
553
436
}
554
437
555
438
ret = gnutls_certificate_set_openpgp_key_file
556
(mc->cred, pubkeyfilename, seckeyfilename,
439
(mc.cred, pubkeyfilename, seckeyfilename,
557
440
GNUTLS_OPENPGP_FMT_BASE64);
558
441
if(ret != GNUTLS_E_SUCCESS){
559
fprintf_plus(stderr,
560
"Error[%d] while reading the OpenPGP key pair ('%s',"
561
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
562
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
563
safer_gnutls_strerror(ret));
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
564
447
goto globalfail;
565
448
}
566
449
567
450
/* GnuTLS server initialization */
568
ret = gnutls_dh_params_init(&mc->dh_params);
569
if(ret != GNUTLS_E_SUCCESS){
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
571
" initialization: %s\n",
572
safer_gnutls_strerror(ret));
573
goto globalfail;
574
}
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
451
ret = gnutls_dh_params_init(&mc.dh_params);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
461
goto globalfail;
462
}
463
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
748
465
749
466
return 0;
750
467
751
468
globalfail:
752
469
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_certificate_free_credentials(mc.cred);
471
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
755
473
return -1;
756
474
}
757
475
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
760
mandos_context *mc){
476
static int init_gnutls_session(gnutls_session_t *session){
761
477
int ret;
762
478
/* GnuTLS session creation */
763
do {
764
ret = gnutls_init(session, GNUTLS_SERVER);
765
if(quit_now){
766
return -1;
767
}
768
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
769
480
if(ret != GNUTLS_E_SUCCESS){
770
fprintf_plus(stderr,
771
"Error in GnuTLS session initialization: %s\n",
772
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
773
483
}
774
484
775
485
{
776
486
const char *err;
777
do {
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
779
if(quit_now){
780
gnutls_deinit(*session);
781
return -1;
782
}
783
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
784
488
if(ret != GNUTLS_E_SUCCESS){
785
fprintf_plus(stderr, "Syntax error at: %s\n", err);
786
fprintf_plus(stderr, "GnuTLS error: %s\n",
787
safer_gnutls_strerror(ret));
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
788
492
gnutls_deinit(*session);
789
493
return -1;
790
494
}
791
495
}
792
496
793
do {
794
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
795
mc->cred);
796
if(quit_now){
797
gnutls_deinit(*session);
798
return -1;
799
}
800
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
801
499
if(ret != GNUTLS_E_SUCCESS){
802
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
803
safer_gnutls_strerror(ret));
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
804
502
gnutls_deinit(*session);
805
503
return -1;
806
504
}
807
505
808
506
/* ignore client certificate if any. */
809
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
509
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
810
511
811
512
return 0;
812
513
}
815
516
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
517
__attribute__((unused)) const char *txt){}
817
518
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
823
if(seteuid(0) == -1){
824
ret = errno;
825
}
826
errno = old_errno;
827
return ret;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
836
errno = old_errno;
837
return ret;
838
}
839
if(setuid(0) == -1){
840
ret = errno;
841
}
842
errno = old_errno;
843
return ret;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
851
if(seteuid(uid) == -1){
852
ret = errno;
853
}
854
errno = old_errno;
855
return ret;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
863
if(setuid(uid) == -1){
864
ret = errno;
865
}
866
errno = old_errno;
867
return ret;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
1036
519
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
520
static int start_mandos_communication(const char *ip, uint16_t port,
1039
521
AvahiIfIndex if_index,
1040
int af, mandos_context *mc){
1041
int ret, tcp_sd = -1;
522
int af){
523
int ret, tcp_sd;
1042
524
ssize_t sret;
1043
struct sockaddr_storage to;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
1044
529
char *buffer = NULL;
1045
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
1046
531
size_t buffer_length = 0;
1047
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
1048
534
size_t written;
1049
int retval = -1;
535
int retval = 0;
1050
536
gnutls_session_t session;
1051
537
int pf; /* Protocol family */
1052
bool route_added = false;
1053
1054
errno = 0;
1055
1056
if(quit_now){
1057
errno = EINTR;
1058
return -1;
1059
}
1060
538
1061
539
switch(af){
1062
540
case AF_INET6:
1066
544
pf = PF_INET;
1067
545
break;
1068
546
default:
1069
fprintf_plus(stderr, "Bad address family: %d\n", af);
1070
errno = EINVAL;
547
fprintf(stderr, "Bad address family: %d\n", af);
1071
548
return -1;
1072
549
}
1073
550
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1077
bool match = false;
1078
{
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1081
interface))){
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1083
match = true;
1084
break;
1085
}
1086
}
1087
}
1088
if(not match){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1091
if(debug){
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1095
} else {
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1097
" \"%s\"\n",
1098
if_indextoname((unsigned int)if_index,
1099
interface));
1100
}
1101
}
1102
return -1;
1103
}
1104
}
1105
1106
ret = init_gnutls_session(&session, mc);
551
ret = init_gnutls_session(&session);
1107
552
if(ret != 0){
1108
553
return -1;
1109
554
}
1110
555
1111
556
if(debug){
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1113
PRIuMAX "\n", ip, (uintmax_t)port);
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
1114
559
}
1115
560
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
1117
562
if(tcp_sd < 0){
1118
int e = errno;
1119
perror_plus("socket");
1120
errno = e;
1121
goto mandos_end;
1122
}
1123
1124
if(quit_now){
1125
errno = EINTR;
1126
goto mandos_end;
1127
}
1128
563
perror("socket");
564
return -1;
565
}
566
567
memset(&to, 0, sizeof(to));
1129
568
if(af == AF_INET6){
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
569
to.in6.sin6_family = (sa_family_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
571
} else { /* IPv4 */
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
574
}
1138
575
if(ret < 0 ){
1139
int e = errno;
1140
perror_plus("inet_pton");
1141
errno = e;
1142
goto mandos_end;
576
perror("inet_pton");
577
return -1;
1143
578
}
1144
579
if(ret == 0){
1145
int e = errno;
1146
fprintf_plus(stderr, "Bad address: %s\n", ip);
1147
errno = e;
1148
goto mandos_end;
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
1149
582
}
1150
583
if(af == AF_INET6){
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
1154
591
if(if_index == AVAHI_IF_UNSPEC){
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
1156
" incomplete without a network interface\n");
1157
errno = EINVAL;
1158
goto mandos_end;
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
1159
595
}
1160
596
/* Set the network interface number as scope */
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
597
to.in6.sin6_scope_id = (uint32_t)if_index;
1162
598
}
1163
599
} else {
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
1165
}
1166
1167
if(quit_now){
1168
errno = EINTR;
1169
goto mandos_end;
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
1170
603
}
1171
604
1172
605
if(debug){
1173
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1174
607
char interface[IF_NAMESIZE];
1175
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1176
perror_plus("if_indextoname");
609
perror("if_indextoname");
1177
610
} else {
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
1180
613
}
1181
614
} else {
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
1184
617
}
1185
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1186
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1187
if(af == AF_INET6){
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1191
NI_NUMERICHOST);
1192
} else {
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
}
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1204
}
1205
}
1206
1207
if(quit_now){
1208
errno = EINTR;
1209
goto mandos_end;
1210
}
1211
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
620
const char *pcret;
621
if(af == AF_INET6){
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
sizeof(addrstr));
624
} else {
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
626
sizeof(addrstr));
627
}
628
if(pcret == NULL){
629
perror("inet_ntop");
630
} else {
631
if(strcmp(addrstr, ip) != 0){
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
633
}
634
}
635
}
636
637
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
}
642
if(ret < 0){
643
perror("connect");
644
return -1;
1267
645
}
1268
646
1269
647
const char *out = mandos_protocol_version;
1271
649
while(true){
1272
650
size_t out_size = strlen(out);
1273
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1274
out_size - written));
652
out_size - written));
1275
653
if(ret == -1){
1276
int e = errno;
1277
perror_plus("write");
1278
errno = e;
654
perror("write");
655
retval = -1;
1279
656
goto mandos_end;
1280
657
}
1281
658
written += (size_t)ret;
1289
666
break;
1290
667
}
1291
668
}
1292
1293
if(quit_now){
1294
errno = EINTR;
1295
goto mandos_end;
1296
}
1297
669
}
1298
670
1299
671
if(debug){
1300
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1301
}
1302
1303
if(quit_now){
1304
errno = EINTR;
1305
goto mandos_end;
1306
}
1307
1308
/* This casting via intptr_t is to eliminate warning about casting
1309
an int to a pointer type. This is exactly how the GnuTLS Guile
1310
function "set-session-transport-fd!" does it. */
1311
gnutls_transport_set_ptr(session,
1312
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1313
1314
if(quit_now){
1315
errno = EINTR;
1316
goto mandos_end;
1317
}
1318
1319
do {
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
do{
1320
678
ret = gnutls_handshake(session);
1321
if(quit_now){
1322
errno = EINTR;
1323
goto mandos_end;
1324
}
1325
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1326
680
1327
681
if(ret != GNUTLS_E_SUCCESS){
1328
682
if(debug){
1329
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1330
684
gnutls_perror(ret);
1331
685
}
1332
errno = EPROTO;
686
retval = -1;
1333
687
goto mandos_end;
1334
688
}
1335
689
1336
690
/* Read OpenPGP packet that contains the wanted password */
1337
691
1338
692
if(debug){
1339
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1340
" %s\n", ip);
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
1341
695
}
1342
696
1343
697
while(true){
1344
1345
if(quit_now){
1346
errno = EINTR;
1347
goto mandos_end;
1348
}
1349
1350
698
buffer_capacity = incbuffer(&buffer, buffer_length,
1351
buffer_capacity);
699
buffer_capacity);
1352
700
if(buffer_capacity == 0){
1353
int e = errno;
1354
perror_plus("incbuffer");
1355
errno = e;
1356
goto mandos_end;
1357
}
1358
1359
if(quit_now){
1360
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
1361
703
goto mandos_end;
1362
704
}
1363
705
1372
714
case GNUTLS_E_AGAIN:
1373
715
break;
1374
716
case GNUTLS_E_REHANDSHAKE:
1375
do {
717
do{
1376
718
ret = gnutls_handshake(session);
1377
1378
if(quit_now){
1379
errno = EINTR;
1380
goto mandos_end;
1381
}
1382
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1383
720
if(ret < 0){
1384
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1385
"***\n");
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1386
722
gnutls_perror(ret);
1387
errno = EPROTO;
723
retval = -1;
1388
724
goto mandos_end;
1389
725
}
1390
726
break;
1391
727
default:
1392
fprintf_plus(stderr, "Unknown error while reading data from"
1393
" encrypted session with Mandos server\n");
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
1394
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1395
errno = EIO;
1396
732
goto mandos_end;
1397
733
}
1398
734
} else {
1401
737
}
1402
738
1403
739
if(debug){
1404
fprintf_plus(stderr, "Closing TLS session\n");
1405
}
1406
1407
if(quit_now){
1408
errno = EINTR;
1409
goto mandos_end;
1410
}
1411
1412
do {
1413
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1414
if(quit_now){
1415
errno = EINTR;
1416
goto mandos_end;
1417
}
1418
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1419
744
1420
745
if(buffer_length > 0){
1421
ssize_t decrypted_buffer_size;
1422
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1423
&decrypted_buffer, mc);
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
748
&decrypted_buffer);
1424
749
if(decrypted_buffer_size >= 0){
1425
1426
clearerr(stdout);
1427
750
written = 0;
1428
751
while(written < (size_t) decrypted_buffer_size){
1429
if(quit_now){
1430
errno = EINTR;
1431
goto mandos_end;
1432
}
1433
1434
752
ret = (int)fwrite(decrypted_buffer + written, 1,
1435
753
(size_t)decrypted_buffer_size - written,
1436
754
stdout);
1437
755
if(ret == 0 and ferror(stdout)){
1438
int e = errno;
1439
756
if(debug){
1440
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1441
strerror(errno));
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
1442
759
}
1443
errno = e;
1444
goto mandos_end;
760
retval = -1;
761
break;
1445
762
}
1446
763
written += (size_t)ret;
1447
764
}
1448
ret = fflush(stdout);
1449
if(ret != 0){
1450
int e = errno;
1451
if(debug){
1452
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1453
strerror(errno));
1454
}
1455
errno = e;
1456
goto mandos_end;
1457
}
1458
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
1459
768
}
769
} else {
770
retval = -1;
1460
771
}
1461
772
1462
773
/* Shutdown procedure */
1463
774
1464
775
mandos_end:
1465
{
1466
if(route_added){
1467
if(not delete_local_route(ip, if_index)){
1468
fprintf_plus(stderr, "Failed to delete local route to %s on"
1469
" interface %d", ip, if_index);
1470
}
1471
}
1472
int e = errno;
1473
free(decrypted_buffer);
1474
free(buffer);
1475
if(tcp_sd >= 0){
1476
ret = close(tcp_sd);
1477
}
1478
if(ret == -1){
1479
if(e == 0){
1480
e = errno;
1481
}
1482
perror_plus("close");
1483
}
1484
gnutls_deinit(session);
1485
errno = e;
1486
if(quit_now){
1487
errno = EINTR;
1488
retval = -1;
1489
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
1490
780
}
781
gnutls_deinit(session);
1491
782
return retval;
1492
783
}
1493
784
1494
__attribute__((nonnull))
1495
785
static void resolve_callback(AvahiSServiceResolver *r,
1496
786
AvahiIfIndex interface,
1497
787
AvahiProtocol proto,
1505
795
AVAHI_GCC_UNUSED AvahiStringList *txt,
1506
796
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1507
797
flags,
1508
void *mc){
1509
if(r == NULL){
1510
return;
1511
}
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
1512
800
1513
801
/* Called whenever a service has been resolved successfully or
1514
802
timed out */
1515
803
1516
if(quit_now){
1517
avahi_s_service_resolver_free(r);
1518
return;
1519
}
1520
1521
804
switch(event){
1522
805
default:
1523
806
case AVAHI_RESOLVER_FAILURE:
1524
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1525
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1526
domain,
1527
avahi_strerror(avahi_server_errno
1528
(((mandos_context*)mc)->server)));
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
1529
810
break;
1530
811
1531
812
case AVAHI_RESOLVER_FOUND:
1533
814
char ip[AVAHI_ADDRESS_STR_MAX];
1534
815
avahi_address_snprint(ip, sizeof(ip), address);
1535
816
if(debug){
1536
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1537
PRIdMAX ") on port %" PRIu16 "\n", name,
1538
host_name, ip, (intmax_t)interface, port);
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
1539
820
}
1540
int ret = start_mandos_communication(ip, (in_port_t)port,
1541
interface,
1542
avahi_proto_to_af(proto),
1543
mc);
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
1544
823
if(ret == 0){
1545
avahi_simple_poll_quit(simple_poll);
1546
} else {
1547
if(not add_server(ip, (in_port_t)port, interface,
1548
avahi_proto_to_af(proto),
1549
&((mandos_context*)mc)->current_server)){
1550
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1551
" list\n", name);
1552
}
824
avahi_simple_poll_quit(mc.simple_poll);
1553
825
}
1554
826
}
1555
827
}
1565
837
const char *domain,
1566
838
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1567
839
flags,
1568
void *mc){
1569
if(b == NULL){
1570
return;
1571
}
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
1572
842
1573
843
/* Called whenever a new services becomes available on the LAN or
1574
844
is removed from the LAN */
1575
845
1576
if(quit_now){
1577
return;
1578
}
1579
1580
846
switch(event){
1581
847
default:
1582
848
case AVAHI_BROWSER_FAILURE:
1583
849
1584
fprintf_plus(stderr, "(Avahi browser) %s\n",
1585
avahi_strerror(avahi_server_errno
1586
(((mandos_context*)mc)->server)));
1587
avahi_simple_poll_quit(simple_poll);
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
1588
853
return;
1589
854
1590
855
case AVAHI_BROWSER_NEW:
1593
858
the callback function is called the Avahi server will free the
1594
859
resolver for us. */
1595
860
1596
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1597
interface, protocol, name, type,
1598
domain, protocol, 0,
1599
resolve_callback, mc) == NULL)
1600
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1601
" %s\n", name,
1602
avahi_strerror(avahi_server_errno
1603
(((mandos_context*)mc)->server)));
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1604
866
break;
1605
867
1606
868
case AVAHI_BROWSER_REMOVE:
1609
871
case AVAHI_BROWSER_ALL_FOR_NOW:
1610
872
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1611
873
if(debug){
1612
fprintf_plus(stderr, "No Mandos server found, still"
1613
" searching...\n");
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1614
875
}
1615
876
break;
1616
877
}
1617
878
}
1618
879
1619
/* Signal handler that stops main loop after SIGTERM */
1620
static void handle_sigterm(int sig){
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1621
884
if(quit_now){
1622
885
return;
1623
886
}
1624
887
quit_now = 1;
1625
signal_received = sig;
1626
int old_errno = errno;
1627
/* set main loop to exit */
1628
if(simple_poll != NULL){
1629
avahi_simple_poll_quit(simple_poll);
1630
}
1631
errno = old_errno;
1632
}
1633
1634
__attribute__((nonnull, warn_unused_result))
1635
bool get_flags(const char *ifname, struct ifreq *ifr){
1636
int ret;
1637
int old_errno;
1638
1639
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1640
if(s < 0){
1641
old_errno = errno;
1642
perror_plus("socket");
1643
errno = old_errno;
1644
return false;
1645
}
1646
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1647
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1648
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1649
if(ret == -1){
1650
if(debug){
1651
old_errno = errno;
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
errno = old_errno;
1654
}
1655
return false;
1656
}
1657
return true;
1658
}
1659
1660
__attribute__((nonnull, warn_unused_result))
1661
bool good_flags(const char *ifname, const struct ifreq *ifr){
1662
1663
/* Reject the loopback device */
1664
if(ifr->ifr_flags & IFF_LOOPBACK){
1665
if(debug){
1666
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1667
ifname);
1668
}
1669
return false;
1670
}
1671
/* Accept point-to-point devices only if connect_to is specified */
1672
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1673
if(debug){
1674
fprintf_plus(stderr, "Accepting point-to-point interface"
1675
" \"%s\"\n", ifname);
1676
}
1677
return true;
1678
}
1679
/* Otherwise, reject non-broadcast-capable devices */
1680
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1681
if(debug){
1682
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1683
" \"%s\"\n", ifname);
1684
}
1685
return false;
1686
}
1687
/* Reject non-ARP interfaces (including dummy interfaces) */
1688
if(ifr->ifr_flags & IFF_NOARP){
1689
if(debug){
1690
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1691
ifname);
1692
}
1693
return false;
1694
}
1695
1696
/* Accept this device */
1697
if(debug){
1698
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1699
}
1700
return true;
1701
}
1702
1703
/*
1704
* This function determines if a directory entry in /sys/class/net
1705
* corresponds to an acceptable network device.
1706
* (This function is passed to scandir(3) as a filter function.)
1707
*/
1708
__attribute__((nonnull, warn_unused_result))
1709
int good_interface(const struct dirent *if_entry){
1710
if(if_entry->d_name[0] == '.'){
1711
return 0;
1712
}
1713
1714
struct ifreq ifr;
1715
if(not get_flags(if_entry->d_name, &ifr)){
1716
if(debug){
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", if_entry->d_name);
1719
}
1720
return 0;
1721
}
1722
1723
if(not good_flags(if_entry->d_name, &ifr)){
1724
return 0;
1725
}
1726
return 1;
1727
}
1728
1729
/*
1730
* This function determines if a network interface is up.
1731
*/
1732
__attribute__((nonnull, warn_unused_result))
1733
bool interface_is_up(const char *interface){
1734
struct ifreq ifr;
1735
if(not get_flags(interface, &ifr)){
1736
if(debug){
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
}
1740
return false;
1741
}
1742
1743
return (bool)(ifr.ifr_flags & IFF_UP);
1744
}
1745
1746
/*
1747
* This function determines if a network interface is running
1748
*/
1749
__attribute__((nonnull, warn_unused_result))
1750
bool interface_is_running(const char *interface){
1751
struct ifreq ifr;
1752
if(not get_flags(interface, &ifr)){
1753
if(debug){
1754
fprintf_plus(stderr, "Failed to get flags for interface "
1755
"\"%s\"\n", interface);
1756
}
1757
return false;
1758
}
1759
1760
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1761
}
1762
1763
__attribute__((nonnull, pure, warn_unused_result))
1764
int notdotentries(const struct dirent *direntry){
1765
/* Skip "." and ".." */
1766
if(direntry->d_name[0] == '.'
1767
and (direntry->d_name[1] == '\0'
1768
or (direntry->d_name[1] == '.'
1769
and direntry->d_name[2] == '\0'))){
1770
return 0;
1771
}
1772
return 1;
1773
}
1774
1775
/* Is this directory entry a runnable program? */
1776
__attribute__((nonnull, warn_unused_result))
1777
int runnable_hook(const struct dirent *direntry){
1778
int ret;
1779
size_t sret;
1780
struct stat st;
1781
1782
if((direntry->d_name)[0] == '\0'){
1783
/* Empty name? */
1784
return 0;
1785
}
1786
1787
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1788
"abcdefghijklmnopqrstuvwxyz"
1789
"0123456789"
1790
"_.-");
1791
if((direntry->d_name)[sret] != '\0'){
1792
/* Contains non-allowed characters */
1793
if(debug){
1794
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1795
direntry->d_name);
1796
}
1797
return 0;
1798
}
1799
1800
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1801
if(ret == -1){
1802
if(debug){
1803
perror_plus("Could not stat hook");
1804
}
1805
return 0;
1806
}
1807
if(not (S_ISREG(st.st_mode))){
1808
/* Not a regular file */
1809
if(debug){
1810
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1811
direntry->d_name);
1812
}
1813
return 0;
1814
}
1815
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1816
/* Not executable */
1817
if(debug){
1818
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1819
direntry->d_name);
1820
}
1821
return 0;
1822
}
1823
if(debug){
1824
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1825
direntry->d_name);
1826
}
1827
return 1;
1828
}
1829
1830
__attribute__((nonnull, warn_unused_result))
1831
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1832
mandos_context *mc){
1833
int ret;
1834
struct timespec now;
1835
struct timespec waited_time;
1836
intmax_t block_time;
1837
1838
while(true){
1839
if(mc->current_server == NULL){
1840
if(debug){
1841
fprintf_plus(stderr, "Wait until first server is found."
1842
" No timeout!\n");
1843
}
1844
ret = avahi_simple_poll_iterate(s, -1);
1845
} else {
1846
if(debug){
1847
fprintf_plus(stderr, "Check current_server if we should run"
1848
" it, or wait\n");
1849
}
1850
/* the current time */
1851
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1852
if(ret == -1){
1853
perror_plus("clock_gettime");
1854
return -1;
1855
}
1856
/* Calculating in ms how long time between now and server
1857
who we visted longest time ago. Now - last seen. */
1858
waited_time.tv_sec = (now.tv_sec
1859
- mc->current_server->last_seen.tv_sec);
1860
waited_time.tv_nsec = (now.tv_nsec
1861
- mc->current_server->last_seen.tv_nsec);
1862
/* total time is 10s/10,000ms.
1863
Converting to s from ms by dividing by 1,000,
1864
and ns to ms by dividing by 1,000,000. */
1865
block_time = ((retry_interval
1866
- ((intmax_t)waited_time.tv_sec * 1000))
1867
- ((intmax_t)waited_time.tv_nsec / 1000000));
1868
1869
if(debug){
1870
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1871
block_time);
1872
}
1873
1874
if(block_time <= 0){
1875
ret = start_mandos_communication(mc->current_server->ip,
1876
mc->current_server->port,
1877
mc->current_server->if_index,
1878
mc->current_server->af, mc);
1879
if(ret == 0){
1880
avahi_simple_poll_quit(s);
1881
return 0;
1882
}
1883
ret = clock_gettime(CLOCK_MONOTONIC,
1884
&mc->current_server->last_seen);
1885
if(ret == -1){
1886
perror_plus("clock_gettime");
1887
return -1;
1888
}
1889
mc->current_server = mc->current_server->next;
1890
block_time = 0; /* Call avahi to find new Mandos
1891
servers, but don't block */
1892
}
1893
1894
ret = avahi_simple_poll_iterate(s, (int)block_time);
1895
}
1896
if(ret != 0){
1897
if(ret > 0 or errno != EINTR){
1898
return (ret != 1) ? ret : 0;
1899
}
1900
}
1901
}
1902
}
1903
1904
__attribute__((nonnull))
1905
void run_network_hooks(const char *mode, const char *interface,
1906
const float delay){
1907
struct dirent **direntries = NULL;
1908
if(hookdir_fd == -1){
1909
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1910
| O_CLOEXEC);
1911
if(hookdir_fd == -1){
1912
if(errno == ENOENT){
1913
if(debug){
1914
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1915
" found\n", hookdir);
1916
}
1917
} else {
1918
perror_plus("open");
1919
}
1920
return;
1921
}
1922
}
1923
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1924
runnable_hook, alphasort);
1925
if(numhooks == -1){
1926
perror_plus("scandir");
1927
return;
1928
}
1929
struct dirent *direntry;
1930
int ret;
1931
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1932
if(devnull == -1){
1933
perror_plus("open(\"/dev/null\", O_RDONLY)");
1934
return;
1935
}
1936
for(int i = 0; i < numhooks; i++){
1937
direntry = direntries[i];
1938
if(debug){
1939
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1940
direntry->d_name);
1941
}
1942
pid_t hook_pid = fork();
1943
if(hook_pid == 0){
1944
/* Child */
1945
/* Raise privileges */
1946
errno = raise_privileges_permanently();
1947
if(errno != 0){
1948
perror_plus("Failed to raise privileges");
1949
_exit(EX_NOPERM);
1950
}
1951
/* Set group */
1952
errno = 0;
1953
ret = setgid(0);
1954
if(ret == -1){
1955
perror_plus("setgid");
1956
_exit(EX_NOPERM);
1957
}
1958
/* Reset supplementary groups */
1959
errno = 0;
1960
ret = setgroups(0, NULL);
1961
if(ret == -1){
1962
perror_plus("setgroups");
1963
_exit(EX_NOPERM);
1964
}
1965
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1966
if(ret == -1){
1967
perror_plus("setenv");
1968
_exit(EX_OSERR);
1969
}
1970
ret = setenv("DEVICE", interface, 1);
1971
if(ret == -1){
1972
perror_plus("setenv");
1973
_exit(EX_OSERR);
1974
}
1975
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1976
if(ret == -1){
1977
perror_plus("setenv");
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("MODE", mode, 1);
1981
if(ret == -1){
1982
perror_plus("setenv");
1983
_exit(EX_OSERR);
1984
}
1985
char *delaystring;
1986
ret = asprintf(&delaystring, "%f", (double)delay);
1987
if(ret == -1){
1988
perror_plus("asprintf");
1989
_exit(EX_OSERR);
1990
}
1991
ret = setenv("DELAY", delaystring, 1);
1992
if(ret == -1){
1993
free(delaystring);
1994
perror_plus("setenv");
1995
_exit(EX_OSERR);
1996
}
1997
free(delaystring);
1998
if(connect_to != NULL){
1999
ret = setenv("CONNECT", connect_to, 1);
2000
if(ret == -1){
2001
perror_plus("setenv");
2002
_exit(EX_OSERR);
2003
}
2004
}
2005
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2006
direntry->d_name,
2007
O_RDONLY));
2008
if(hook_fd == -1){
2009
perror_plus("openat");
2010
_exit(EXIT_FAILURE);
2011
}
2012
if(close(hookdir_fd) == -1){
2013
perror_plus("close");
2014
_exit(EXIT_FAILURE);
2015
}
2016
ret = dup2(devnull, STDIN_FILENO);
2017
if(ret == -1){
2018
perror_plus("dup2(devnull, STDIN_FILENO)");
2019
_exit(EX_OSERR);
2020
}
2021
ret = close(devnull);
2022
if(ret == -1){
2023
perror_plus("close");
2024
_exit(EX_OSERR);
2025
}
2026
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2027
if(ret == -1){
2028
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2029
_exit(EX_OSERR);
2030
}
2031
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2032
environ) == -1){
2033
perror_plus("fexecve");
2034
_exit(EXIT_FAILURE);
2035
}
2036
} else {
2037
if(hook_pid == -1){
2038
perror_plus("fork");
2039
free(direntry);
2040
continue;
2041
}
2042
int status;
2043
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2044
perror_plus("waitpid");
2045
free(direntry);
2046
continue;
2047
}
2048
if(WIFEXITED(status)){
2049
if(WEXITSTATUS(status) != 0){
2050
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2051
" with status %d\n", direntry->d_name,
2052
WEXITSTATUS(status));
2053
free(direntry);
2054
continue;
2055
}
2056
} else if(WIFSIGNALED(status)){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2058
" signal %d\n", direntry->d_name,
2059
WTERMSIG(status));
2060
free(direntry);
2061
continue;
2062
} else {
2063
fprintf_plus(stderr, "Warning: network hook \"%s\""
2064
" crashed\n", direntry->d_name);
2065
free(direntry);
2066
continue;
2067
}
2068
}
2069
if(debug){
2070
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2071
direntry->d_name);
2072
}
2073
free(direntry);
2074
}
2075
free(direntries);
2076
if(close(hookdir_fd) == -1){
2077
perror_plus("close");
2078
} else {
2079
hookdir_fd = -1;
2080
}
2081
close(devnull);
2082
}
2083
2084
__attribute__((nonnull, warn_unused_result))
2085
int bring_up_interface(const char *const interface,
2086
const float delay){
2087
int old_errno = errno;
2088
int ret;
2089
struct ifreq network;
2090
unsigned int if_index = if_nametoindex(interface);
2091
if(if_index == 0){
2092
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2093
errno = old_errno;
2094
return ENXIO;
2095
}
2096
2097
if(quit_now){
2098
errno = old_errno;
2099
return EINTR;
2100
}
2101
2102
if(not interface_is_up(interface)){
2103
int ret_errno = 0;
2104
int ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
2106
ret_errno = errno;
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2108
"\"%s\"\n", interface);
2109
errno = old_errno;
2110
return ret_errno;
2111
}
2112
network.ifr_flags |= IFF_UP; /* set flag */
2113
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2115
if(sd == -1){
2116
ret_errno = errno;
2117
perror_plus("socket");
2118
errno = old_errno;
2119
return ret_errno;
2120
}
2121
2122
if(quit_now){
2123
ret = close(sd);
2124
if(ret == -1){
2125
perror_plus("close");
2126
}
2127
errno = old_errno;
2128
return EINTR;
2129
}
2130
2131
if(debug){
2132
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2133
interface);
2134
}
2135
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2138
if(ret_errno != 0){
2139
errno = ret_errno;
2140
perror_plus("Failed to raise privileges");
2141
}
2142
2143
#ifdef __linux__
2144
int ret_linux;
2145
bool restore_loglevel = false;
2146
if(ret_errno == 0){
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
} else {
2153
restore_loglevel = true;
2154
}
2155
}
2156
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
2159
#ifdef __linux__
2160
if(restore_loglevel){
2161
ret_linux = klogctl(7, NULL, 0);
2162
if(ret_linux == -1){
2163
perror_plus("klogctl");
2164
}
2165
}
2166
#endif /* __linux__ */
2167
2168
/* If raise_privileges() succeeded above */
2169
if(ret_errno == 0){
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2172
if(ret_errno != 0){
2173
errno = ret_errno;
2174
perror_plus("Failed to lower privileges");
2175
}
2176
}
2177
2178
/* Close the socket */
2179
ret = close(sd);
2180
if(ret == -1){
2181
perror_plus("close");
2182
}
2183
2184
if(ret_setflags == -1){
2185
errno = ioctl_errno;
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2187
errno = old_errno;
2188
return ioctl_errno;
2189
}
2190
} else if(debug){
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2192
interface);
2193
}
2194
2195
/* Sleep checking until interface is running.
2196
Check every 0.25s, up to total time of delay */
2197
for(int i=0; i < delay * 4; i++){
2198
if(interface_is_running(interface)){
2199
break;
2200
}
2201
struct timespec sleeptime = { .tv_nsec = 250000000 };
2202
ret = nanosleep(&sleeptime, NULL);
2203
if(ret == -1 and errno != EINTR){
2204
perror_plus("nanosleep");
2205
}
2206
}
2207
2208
errno = old_errno;
2209
return 0;
2210
}
2211
2212
__attribute__((nonnull, warn_unused_result))
2213
int take_down_interface(const char *const interface){
2214
int old_errno = errno;
2215
struct ifreq network;
2216
unsigned int if_index = if_nametoindex(interface);
2217
if(if_index == 0){
2218
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2219
errno = old_errno;
2220
return ENXIO;
2221
}
2222
if(interface_is_up(interface)){
2223
int ret_errno = 0;
2224
int ioctl_errno = 0;
2225
if(not get_flags(interface, &network) and debug){
2226
ret_errno = errno;
2227
fprintf_plus(stderr, "Failed to get flags for interface "
2228
"\"%s\"\n", interface);
2229
errno = old_errno;
2230
return ret_errno;
2231
}
2232
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2233
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2235
if(sd == -1){
2236
ret_errno = errno;
2237
perror_plus("socket");
2238
errno = old_errno;
2239
return ret_errno;
2240
}
2241
2242
if(debug){
2243
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2244
interface);
2245
}
2246
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("Failed to raise privileges");
2252
}
2253
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2256
2257
/* If raise_privileges() succeeded above */
2258
if(ret_errno == 0){
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2261
if(ret_errno != 0){
2262
errno = ret_errno;
2263
perror_plus("Failed to lower privileges");
2264
}
2265
}
2266
2267
/* Close the socket */
2268
int ret = close(sd);
2269
if(ret == -1){
2270
perror_plus("close");
2271
}
2272
2273
if(ret_setflags == -1){
2274
errno = ioctl_errno;
2275
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2276
errno = old_errno;
2277
return ioctl_errno;
2278
}
2279
} else if(debug){
2280
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2281
interface);
2282
}
2283
2284
errno = old_errno;
2285
return 0;
888
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
2286
893
}
2287
894
2288
895
int main(int argc, char *argv[]){
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509"
2291
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2292
.current_server = NULL, .interfaces = NULL,
2293
.interfaces_size = 0 };
2294
896
AvahiSServiceBrowser *sb = NULL;
2295
error_t ret_errno;
897
int error;
2296
898
int ret;
2297
899
intmax_t tmpmax;
2298
900
char *tmp;
2299
901
int exitcode = EXIT_SUCCESS;
2300
char *interfaces_to_take_down = NULL;
2301
size_t interfaces_to_take_down_size = 0;
2302
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2303
char old_tempdir[] = "/tmp/mandosXXXXXX";
2304
char *tempdir = NULL;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
bool tempdir_created = false;
2305
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2306
911
const char *seckey = PATHDIR "/" SECKEY;
2307
912
const char *pubkey = PATHDIR "/" PUBKEY;
2308
const char *dh_params_file = NULL;
2309
char *interfaces_hooks = NULL;
2310
913
2311
914
bool gnutls_initialized = false;
2312
915
bool gpgme_initialized = false;
2313
916
float delay = 2.5f;
2314
double retry_interval = 10; /* 10s between trying a server and
2315
retrying the same server again */
2316
917
2317
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
2318
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2319
920
2320
uid = getuid();
2321
gid = getgid();
2322
2323
/* Lower any group privileges we might have, just to be safe */
2324
errno = 0;
2325
ret = setgid(gid);
2326
if(ret == -1){
2327
perror_plus("setgid");
2328
}
2329
2330
/* Lower user privileges (temporarily) */
2331
errno = 0;
2332
ret = seteuid(uid);
2333
if(ret == -1){
2334
perror_plus("seteuid");
2335
}
2336
2337
if(quit_now){
2338
goto end;
2339
}
2340
2341
921
{
2342
922
struct argp_option options[] = {
2343
923
{ .name = "debug", .key = 128,
2364
944
.doc = "Bit length of the prime number used in the"
2365
945
" Diffie-Hellman key exchange",
2366
946
.group = 2 },
2367
{ .name = "dh-params", .key = 134,
2368
.arg = "FILE",
2369
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2370
" for the Diffie-Hellman key exchange",
2371
.group = 2 },
2372
947
{ .name = "priority", .key = 130,
2373
948
.arg = "STRING",
2374
949
.doc = "GnuTLS priority string for the TLS handshake",
2377
952
.arg = "SECONDS",
2378
953
.doc = "Maximum delay to wait for interface startup",
2379
954
.group = 2 },
2380
{ .name = "retry", .key = 132,
2381
.arg = "SECONDS",
2382
.doc = "Retry interval used when denied by the Mandos server",
2383
.group = 2 },
2384
{ .name = "network-hook-dir", .key = 133,
2385
.arg = "DIR",
2386
.doc = "Directory where network hooks are located",
2387
.group = 2 },
2388
/*
2389
* These reproduce what we would get without ARGP_NO_HELP
2390
*/
2391
{ .name = "help", .key = '?',
2392
.doc = "Give this help list", .group = -1 },
2393
{ .name = "usage", .key = -3,
2394
.doc = "Give a short usage message", .group = -1 },
2395
{ .name = "version", .key = 'V',
2396
.doc = "Print program version", .group = -1 },
2397
955
{ .name = NULL }
2398
956
};
2399
957
2400
958
error_t parse_opt(int key, char *arg,
2401
959
struct argp_state *state){
2402
errno = 0;
2403
960
switch(key){
2404
961
case 128: /* --debug */
2405
962
debug = true;
2408
965
connect_to = arg;
2409
966
break;
2410
967
case 'i': /* --interface */
2411
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2412
arg, (int)',');
2413
if(ret_errno != 0){
2414
argp_error(state, "%s", strerror(ret_errno));
2415
}
968
interface = arg;
2416
969
break;
2417
970
case 's': /* --seckey */
2418
971
seckey = arg;
2425
978
tmpmax = strtoimax(arg, &tmp, 10);
2426
979
if(errno != 0 or tmp == arg or *tmp != '\0'
2427
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2428
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
2429
983
}
2430
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2431
985
break;
2432
case 134: /* --dh-params */
2433
dh_params_file = arg;
2434
break;
2435
986
case 130: /* --priority */
2436
987
mc.priority = arg;
2437
988
break;
2439
990
errno = 0;
2440
991
delay = strtof(arg, &tmp);
2441
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
2442
argp_error(state, "Bad delay");
2443
}
2444
case 132: /* --retry */
2445
errno = 0;
2446
retry_interval = strtod(arg, &tmp);
2447
if(errno != 0 or tmp == arg or *tmp != '\0'
2448
or (retry_interval * 1000) > INT_MAX
2449
or retry_interval < 0){
2450
argp_error(state, "Bad retry interval");
2451
}
2452
break;
2453
case 133: /* --network-hook-dir */
2454
hookdir = arg;
2455
break;
2456
/*
2457
* These reproduce what we would get without ARGP_NO_HELP
2458
*/
2459
case '?': /* --help */
2460
argp_state_help(state, state->out_stream,
2461
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2462
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2463
case -3: /* --usage */
2464
argp_state_help(state, state->out_stream,
2465
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2466
case 'V': /* --version */
2467
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2468
exit(argp_err_exit_status);
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
2469
1000
break;
2470
1001
default:
2471
1002
return ARGP_ERR_UNKNOWN;
2472
1003
}
2473
return errno;
1004
return 0;
2474
1005
}
2475
1006
2476
1007
struct argp argp = { .options = options, .parser = parse_opt,
2477
1008
.args_doc = "",
2478
1009
.doc = "Mandos client -- Get and decrypt"
2479
1010
" passwords from a Mandos server" };
2480
ret_errno = argp_parse(&argp, argc, argv,
2481
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2482
switch(ret_errno){
2483
case 0:
2484
break;
2485
case ENOMEM:
2486
default:
2487
errno = ret_errno;
2488
perror_plus("argp_parse");
2489
exitcode = EX_OSERR;
2490
goto end;
2491
case EINVAL:
2492
exitcode = EX_USAGE;
2493
goto end;
2494
}
2495
}
2496
2497
{
2498
/* Work around Debian bug #633582:
2499
<https://bugs.debian.org/633582> */
2500
2501
/* Re-raise privileges */
2502
ret = raise_privileges();
2503
if(ret != 0){
2504
errno = ret;
2505
perror_plus("Failed to raise privileges");
2506
} else {
2507
struct stat st;
2508
2509
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2510
int seckey_fd = open(seckey, O_RDONLY);
2511
if(seckey_fd == -1){
2512
perror_plus("open");
2513
} else {
2514
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2515
if(ret == -1){
2516
perror_plus("fstat");
2517
} else {
2518
if(S_ISREG(st.st_mode)
2519
and st.st_uid == 0 and st.st_gid == 0){
2520
ret = fchown(seckey_fd, uid, gid);
2521
if(ret == -1){
2522
perror_plus("fchown");
2523
}
2524
}
2525
}
2526
close(seckey_fd);
2527
}
2528
}
2529
2530
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2531
int pubkey_fd = open(pubkey, O_RDONLY);
2532
if(pubkey_fd == -1){
2533
perror_plus("open");
2534
} else {
2535
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2536
if(ret == -1){
2537
perror_plus("fstat");
2538
} else {
2539
if(S_ISREG(st.st_mode)
2540
and st.st_uid == 0 and st.st_gid == 0){
2541
ret = fchown(pubkey_fd, uid, gid);
2542
if(ret == -1){
2543
perror_plus("fchown");
2544
}
2545
}
2546
}
2547
close(pubkey_fd);
2548
}
2549
}
2550
2551
if(dh_params_file != NULL
2552
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2553
int dhparams_fd = open(dh_params_file, O_RDONLY);
2554
if(dhparams_fd == -1){
2555
perror_plus("open");
2556
} else {
2557
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2558
if(ret == -1){
2559
perror_plus("fstat");
2560
} else {
2561
if(S_ISREG(st.st_mode)
2562
and st.st_uid == 0 and st.st_gid == 0){
2563
ret = fchown(dhparams_fd, uid, gid);
2564
if(ret == -1){
2565
perror_plus("fchown");
2566
}
2567
}
2568
}
2569
close(dhparams_fd);
2570
}
2571
}
2572
2573
/* Lower privileges */
2574
ret = lower_privileges();
2575
if(ret != 0){
2576
errno = ret;
2577
perror_plus("Failed to lower privileges");
2578
}
2579
}
2580
}
2581
2582
/* Remove invalid interface names (except "none") */
2583
{
2584
char *interface = NULL;
2585
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2586
interface))){
2587
if(strcmp(interface, "none") != 0
2588
and if_nametoindex(interface) == 0){
2589
if(interface[0] != '\0'){
2590
fprintf_plus(stderr, "Not using nonexisting interface"
2591
" \"%s\"\n", interface);
2592
}
2593
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2594
interface = NULL;
2595
}
2596
}
2597
}
2598
2599
/* Run network hooks */
2600
{
2601
if(mc.interfaces != NULL){
2602
interfaces_hooks = malloc(mc.interfaces_size);
2603
if(interfaces_hooks == NULL){
2604
perror_plus("malloc");
2605
goto end;
2606
}
2607
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2608
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2609
}
2610
run_network_hooks("start", interfaces_hooks != NULL ?
2611
interfaces_hooks : "", delay);
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
2612
1017
}
2613
1018
2614
1019
if(not debug){
2619
1024
from the signal handler */
2620
1025
/* Initialize the pseudo-RNG for Avahi */
2621
1026
srand((unsigned int) time(NULL));
2622
simple_poll = avahi_simple_poll_new();
2623
if(simple_poll == NULL){
2624
fprintf_plus(stderr,
2625
"Avahi: Failed to create simple poll object.\n");
2626
exitcode = EX_UNAVAILABLE;
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
2627
1031
goto end;
2628
1032
}
2629
1033
2630
1034
sigemptyset(&sigterm_action.sa_mask);
2631
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2632
1036
if(ret == -1){
2633
perror_plus("sigaddset");
2634
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
2635
1039
goto end;
2636
1040
}
2637
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2638
1042
if(ret == -1){
2639
perror_plus("sigaddset");
2640
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
2641
1045
goto end;
2642
1046
}
2643
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2644
1048
if(ret == -1){
2645
perror_plus("sigaddset");
2646
exitcode = EX_OSERR;
2647
goto end;
2648
}
2649
/* Need to check if the handler is SIG_IGN before handling:
2650
| [[info:libc:Initial Signal Actions]] |
2651
| [[info:libc:Basic Signal Handling]] |
2652
*/
2653
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2654
if(ret == -1){
2655
perror_plus("sigaction");
2656
return EX_OSERR;
2657
}
2658
if(old_sigterm_action.sa_handler != SIG_IGN){
2659
ret = sigaction(SIGINT, &sigterm_action, NULL);
2660
if(ret == -1){
2661
perror_plus("sigaction");
2662
exitcode = EX_OSERR;
2663
goto end;
2664
}
2665
}
2666
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2667
if(ret == -1){
2668
perror_plus("sigaction");
2669
return EX_OSERR;
2670
}
2671
if(old_sigterm_action.sa_handler != SIG_IGN){
2672
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2673
if(ret == -1){
2674
perror_plus("sigaction");
2675
exitcode = EX_OSERR;
2676
goto end;
2677
}
2678
}
2679
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2680
if(ret == -1){
2681
perror_plus("sigaction");
2682
return EX_OSERR;
2683
}
2684
if(old_sigterm_action.sa_handler != SIG_IGN){
2685
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2686
if(ret == -1){
2687
perror_plus("sigaction");
2688
exitcode = EX_OSERR;
2689
goto end;
2690
}
2691
}
2692
2693
/* If no interfaces were specified, make a list */
2694
if(mc.interfaces == NULL){
2695
struct dirent **direntries = NULL;
2696
/* Look for any good interfaces */
2697
ret = scandir(sys_class_net, &direntries, good_interface,
2698
alphasort);
2699
if(ret >= 1){
2700
/* Add all found interfaces to interfaces list */
2701
for(int i = 0; i < ret; ++i){
2702
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2703
direntries[i]->d_name);
2704
if(ret_errno != 0){
2705
errno = ret_errno;
2706
perror_plus("argz_add");
2707
free(direntries[i]);
2708
continue;
2709
}
2710
if(debug){
2711
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2712
direntries[i]->d_name);
2713
}
2714
free(direntries[i]);
2715
}
2716
free(direntries);
2717
} else {
2718
if(ret == 0){
2719
free(direntries);
2720
}
2721
fprintf_plus(stderr, "Could not find a network interface\n");
2722
exitcode = EXIT_FAILURE;
2723
goto end;
2724
}
2725
}
2726
2727
/* Bring up interfaces which are down, and remove any "none"s */
2728
{
2729
char *interface = NULL;
2730
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2731
interface))){
2732
/* If interface name is "none", stop bringing up interfaces.
2733
Also remove all instances of "none" from the list */
2734
if(strcmp(interface, "none") == 0){
2735
argz_delete(&mc.interfaces, &mc.interfaces_size,
2736
interface);
2737
interface = NULL;
2738
while((interface = argz_next(mc.interfaces,
2739
mc.interfaces_size, interface))){
2740
if(strcmp(interface, "none") == 0){
2741
argz_delete(&mc.interfaces, &mc.interfaces_size,
2742
interface);
2743
interface = NULL;
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
2744
1113
}
2745
1114
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
2746
1125
break;
2747
1126
}
2748
bool interface_was_up = interface_is_up(interface);
2749
errno = bring_up_interface(interface, delay);
2750
if(not interface_was_up){
2751
if(errno != 0){
2752
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2753
" %s\n", interface, strerror(errno));
2754
} else {
2755
errno = argz_add(&interfaces_to_take_down,
2756
&interfaces_to_take_down_size,
2757
interface);
2758
if(errno != 0){
2759
perror_plus("argz_add");
2760
}
2761
}
2762
}
2763
}
2764
if(debug and (interfaces_to_take_down == NULL)){
2765
fprintf_plus(stderr, "No interfaces were brought up\n");
2766
}
2767
}
2768
2769
/* If we only got one interface, explicitly use only that one */
2770
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2771
if(debug){
2772
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2773
mc.interfaces);
2774
}
2775
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2776
}
2777
2778
if(quit_now){
2779
goto end;
2780
}
2781
2782
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2783
if(ret == -1){
2784
fprintf_plus(stderr, "init_gnutls_global failed\n");
2785
exitcode = EX_UNAVAILABLE;
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2786
1166
goto end;
2787
1167
} else {
2788
1168
gnutls_initialized = true;
2789
1169
}
2790
1170
2791
if(quit_now){
2792
goto end;
2793
}
2794
2795
/* Try /run/tmp before /tmp */
2796
tempdir = mkdtemp(run_tempdir);
2797
if(tempdir == NULL and errno == ENOENT){
2798
if(debug){
2799
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2800
run_tempdir, old_tempdir);
2801
}
2802
tempdir = mkdtemp(old_tempdir);
2803
}
2804
if(tempdir == NULL){
2805
perror_plus("mkdtemp");
2806
goto end;
2807
}
2808
2809
if(quit_now){
2810
goto end;
2811
}
2812
2813
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2814
fprintf_plus(stderr, "init_gpgme failed\n");
2815
exitcode = EX_UNAVAILABLE;
1171
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1173
goto end;
1174
}
1175
tempdir_created = true;
1176
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2816
1180
goto end;
2817
1181
} else {
2818
1182
gpgme_initialized = true;
2819
1183
}
2820
1184
2821
if(quit_now){
2822
goto end;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2823
1192
}
2824
1193
2825
1194
if(connect_to != NULL){
2826
1195
/* Connect directly, do not use Zeroconf */
2827
1196
/* (Mainly meant for debugging) */
2828
1197
char *address = strrchr(connect_to, ':');
2829
2830
1198
if(address == NULL){
2831
fprintf_plus(stderr, "No colon in address\n");
2832
exitcode = EX_USAGE;
2833
goto end;
2834
}
2835
2836
if(quit_now){
2837
goto end;
2838
}
2839
2840
in_port_t port;
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
2841
1204
errno = 0;
2842
1205
tmpmax = strtoimax(address+1, &tmp, 10);
2843
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2844
or tmpmax != (in_port_t)tmpmax){
2845
fprintf_plus(stderr, "Bad port number\n");
2846
exitcode = EX_USAGE;
2847
goto end;
2848
}
2849
2850
if(quit_now){
2851
goto end;
2852
}
2853
2854
port = (in_port_t)tmpmax;
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
2855
1213
*address = '\0';
1214
address = connect_to;
2856
1215
/* Colon in address indicates IPv6 */
2857
1216
int af;
2858
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
2859
1218
af = AF_INET6;
2860
/* Accept [] around IPv6 address - see RFC 5952 */
2861
if(connect_to[0] == '[' and address[-1] == ']')
2862
{
2863
connect_to++;
2864
address[-1] = '\0';
2865
}
2866
1219
} else {
2867
1220
af = AF_INET;
2868
1221
}
2869
address = connect_to;
2870
2871
if(quit_now){
2872
goto end;
2873
}
2874
2875
while(not quit_now){
2876
ret = start_mandos_communication(address, port, if_index, af,
2877
&mc);
2878
if(quit_now or ret == 0){
2879
break;
2880
}
2881
if(debug){
2882
fprintf_plus(stderr, "Retrying in %d seconds\n",
2883
(int)retry_interval);
2884
}
2885
sleep((unsigned int)retry_interval);
2886
}
2887
2888
if(not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2889
1226
exitcode = EXIT_SUCCESS;
2890
1227
}
1228
goto end;
1229
}
2891
1230
2892
goto end;
2893
}
2894
2895
if(quit_now){
2896
goto end;
2897
}
2898
2899
1231
{
2900
1232
AvahiServerConfig config;
2901
1233
/* Do not publish any local Zeroconf records */
2906
1238
config.publish_domain = 0;
2907
1239
2908
1240
/* Allocate a new server */
2909
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2910
&config, NULL, NULL, &ret);
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
2911
1244
2912
1245
/* Free the Avahi configuration data */
2913
1246
avahi_server_config_free(&config);
2915
1248
2916
1249
/* Check if creating the Avahi server object succeeded */
2917
1250
if(mc.server == NULL){
2918
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2919
avahi_strerror(ret));
2920
exitcode = EX_UNAVAILABLE;
2921
goto end;
2922
}
2923
2924
if(quit_now){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2925
1254
goto end;
2926
1255
}
2927
1256
2928
1257
/* Create the Avahi service browser */
2929
1258
sb = avahi_s_service_browser_new(mc.server, if_index,
2930
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2931
NULL, 0, browse_callback,
2932
(void *)&mc);
1260
NULL, 0, browse_callback, NULL);
2933
1261
if(sb == NULL){
2934
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2935
avahi_strerror(avahi_server_errno(mc.server)));
2936
exitcode = EX_UNAVAILABLE;
2937
goto end;
2938
}
2939
2940
if(quit_now){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
2941
1265
goto end;
2942
1266
}
2943
1267
2944
1268
/* Run the main loop */
2945
1269
2946
1270
if(debug){
2947
fprintf_plus(stderr, "Starting Avahi loop search\n");
1271
fprintf(stderr, "Starting Avahi loop search\n");
2948
1272
}
2949
1273
2950
ret = avahi_loop_with_timeout(simple_poll,
2951
(int)(retry_interval * 1000), &mc);
2952
if(debug){
2953
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2954
(ret == 0) ? "successfully" : "with error");
2955
}
1274
avahi_simple_poll_loop(mc.simple_poll);
2956
1275
2957
1276
end:
2958
1277
2959
1278
if(debug){
2960
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2961
1280
}
2962
1281
2963
1282
/* Cleanup things */
2964
free(mc.interfaces);
2965
2966
1283
if(sb != NULL)
2967
1284
avahi_s_service_browser_free(sb);
2968
1285
2969
1286
if(mc.server != NULL)
2970
1287
avahi_server_free(mc.server);
2971
1288
2972
if(simple_poll != NULL)
2973
avahi_simple_poll_free(simple_poll);
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
2974
1291
2975
1292
if(gnutls_initialized){
2976
1293
gnutls_certificate_free_credentials(mc.cred);
1294
gnutls_global_deinit();
2977
1295
gnutls_dh_params_deinit(mc.dh_params);
2978
1296
}
2979
1297
2981
1299
gpgme_release(mc.ctx);
2982
1300
}
2983
1301
2984
/* Cleans up the circular linked list of Mandos servers the client
2985
has seen */
2986
if(mc.current_server != NULL){
2987
mc.current_server->prev->next = NULL;
2988
while(mc.current_server != NULL){
2989
server *next = mc.current_server->next;
2990
#ifdef __GNUC__
2991
#pragma GCC diagnostic push
2992
#pragma GCC diagnostic ignored "-Wcast-qual"
2993
#endif
2994
free((char *)(mc.current_server->ip));
2995
#ifdef __GNUC__
2996
#pragma GCC diagnostic pop
2997
#endif
2998
free(mc.current_server);
2999
mc.current_server = next;
3000
}
3001
}
3002
3003
/* Re-raise privileges */
3004
{
3005
ret = raise_privileges();
3006
if(ret != 0){
3007
errno = ret;
3008
perror_plus("Failed to raise privileges");
3009
} else {
3010
3011
/* Run network hooks */
3012
run_network_hooks("stop", interfaces_hooks != NULL ?
3013
interfaces_hooks : "", delay);
3014
3015
/* Take down the network interfaces which were brought up */
3016
{
3017
char *interface = NULL;
3018
while((interface=argz_next(interfaces_to_take_down,
3019
interfaces_to_take_down_size,
3020
interface))){
3021
ret = take_down_interface(interface);
3022
if(ret != 0){
3023
errno = ret;
3024
perror_plus("Failed to take down interface");
3025
}
3026
}
3027
if(debug and (interfaces_to_take_down == NULL)){
3028
fprintf_plus(stderr, "No interfaces needed to be taken"
3029
" down\n");
3030
}
3031
}
3032
}
3033
3034
ret = lower_privileges_permanently();
3035
if(ret != 0){
3036
errno = ret;
3037
perror_plus("Failed to lower privileges permanently");
3038
}
3039
}
3040
3041
free(interfaces_to_take_down);
3042
free(interfaces_hooks);
3043
3044
void clean_dir_at(int base, const char * const dirname,
3045
uintmax_t level){
3046
struct dirent **direntries = NULL;
3047
int dret;
3048
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3049
O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(dir_fd == -1){
3054
perror_plus("open");
3055
}
3056
int numentries = scandirat(dir_fd, ".", &direntries,
3057
notdotentries, alphasort);
3058
if(numentries >= 0){
3059
for(int i = 0; i < numentries; i++){
3060
if(debug){
3061
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3062
dirname, direntries[i]->d_name);
3063
}
3064
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3065
if(dret == -1){
3066
if(errno == EISDIR){
3067
dret = unlinkat(dir_fd, direntries[i]->d_name,
3068
AT_REMOVEDIR);
3069
}
3070
if((dret == -1) and (errno == ENOTEMPTY)
3071
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3072
== 0) and (level == 0)){
3073
/* Recurse only in this special case */
3074
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3075
dret = 0;
3076
}
3077
if(dret == -1){
3078
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3079
direntries[i]->d_name, strerror(errno));
3080
}
3081
}
3082
free(direntries[i]);
3083
}
3084
3085
/* need to clean even if 0 because man page doesn't specify */
3086
free(direntries);
3087
if(numentries == -1){
3088
perror_plus("scandirat");
3089
}
3090
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3091
if(dret == -1 and errno != ENOENT){
3092
perror_plus("rmdir");
3093
}
3094
} else {
3095
perror_plus("scandirat");
3096
}
3097
close(dir_fd);
3098
}
3099
3100
/* Removes the GPGME temp directory and all files inside */
3101
if(tempdir != NULL){
3102
clean_dir_at(-1, tempdir, 0);
3103
}
3104
3105
if(quit_now){
3106
sigemptyset(&old_sigterm_action.sa_mask);
3107
old_sigterm_action.sa_handler = SIG_DFL;
3108
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3109
&old_sigterm_action,
3110
NULL));
3111
if(ret == -1){
3112
perror_plus("sigaction");
3113
}
3114
do {
3115
ret = raise(signal_received);
3116
} while(ret != 0 and errno == EINTR);
3117
if(ret != 0){
3118
perror_plus("raise");
3119
abort();
3120
}
3121
TEMP_FAILURE_RETRY(pause());
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
direntry->d_name);
1327
if(ret < 0){
1328
perror("asprintf");
1329
continue;
1330
}
1331
ret = remove(fullname);
1332
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
1335
}
1336
free(fullname);
1337
}
1338
closedir(d);
1339
}
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
3122
1344
}
3123
1345
3124
1346
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0