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237.7.290
(compared to revision 269.1.1)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-03-10 18:03:38 UTC
- mto: (237.7.304 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150310180338-pcxw6r2qmw9k6br9
Add ":!RSA" to GnuTLS priority string, to disallow non-DHE kx.
If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default. The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.
There is a "PFS" priority string specifier, but we can't use it because:
1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
enables a lot more algorithms than "SECURE256".
2. It is only available since GnuTLS 3.2.4.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default. The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.
There is a "PFS" priority string specifier, but we can't use it because:
1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
enables a lot more algorithms than "SECURE256".
2. It is only available since GnuTLS 3.2.4.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
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* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
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*
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* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
28
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*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
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40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
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#include <stdbool.h> /* bool, false, true */
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#include <string.h> /* memset(), strcmp(), strlen(),
50
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strerror(), asprintf(), strcpy() */
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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
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#include <dirent.h> /* opendir(), struct dirent, readdir()
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*/
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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strtoimax() */
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#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
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#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
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program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
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*/
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), seteuid(),
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setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
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setgid(), pause(), _exit(),
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unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
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#include <iso646.h> /* not, or, and */
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#include <argp.h> /* struct argp_option, error_t, struct
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argp_state, struct argp,
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#include <signal.h> /* sigemptyset(), sigaddset(),
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sigaction(), SIGTERM, sig_atomic_t,
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raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
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argz_delete(), argz_append(),
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argz_stringify(), argz_add(),
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argz_count() */
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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
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EAI_SYSTEM, gai_strerror() */
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#ifdef __linux__
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#include <sys/klog.h> /* klogctl() */
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init_gnutls_session(),
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GNUTLS_* */
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#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
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GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
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GNUTLS_OPENPGP_FMT_BASE64 */
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/* GPGME */
112
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#include <gpgme.h> /* All GPGME types, constants and
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#define PATHDIR "/conf/conf.d/mandos"
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#define SECKEY "seckey.txt"
122
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#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
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bool debug = false;
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static const char mandos_protocol_version[] = "1";
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const char *argp_program_version = "mandos-client " VERSION;
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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const char *argp_program_bug_address = "<mandos@recompile.se>";
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static const char sys_class_net[] = "/sys/class/net";
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char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
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/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
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in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
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/* Used for passing in values through the Avahi callback functions */
132
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typedef struct {
133
AvahiSimplePoll *simple_poll;
134
162
AvahiServer *server;
135
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gnutls_certificate_credentials_t cred;
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unsigned int dh_bits;
137
165
gnutls_dh_params_t dh_params;
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const char *priority;
139
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
140
171
} mandos_context;
141
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/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
146
175
147
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sig_atomic_t quit_now = 0;
148
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int signal_received = 0;
149
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/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
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program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
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__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
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150
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/*
151
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* Make additional room in "buffer" for at least BUFFER_SIZE more
152
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* bytes. "buffer_capacity" is how much is currently allocated,
153
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* "buffer_length" is how much is already used.
154
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*/
203
__attribute__((nonnull, warn_unused_result))
155
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size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
205
size_t buffer_capacity){
157
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if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
160
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return 0;
161
214
}
215
*buffer = new_buf;
162
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buffer_capacity += BUFFER_SIZE;
163
217
}
164
218
return buffer_capacity;
165
219
}
166
220
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
167
269
/*
168
270
* Initialize GPGME.
169
271
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
172
277
gpgme_error_t rc;
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gpgme_engine_info_t engine_info;
174
279
175
176
280
/*
177
281
* Helper function to insert pub and seckey to the engine keyring.
178
282
*/
179
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
180
284
int ret;
181
285
int fd;
182
286
gpgme_data_t pgp_data;
183
287
184
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
289
if(fd == -1){
186
perror("open");
290
perror_plus("open");
187
291
return false;
188
292
}
189
293
190
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
295
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
194
298
return false;
195
299
}
196
300
197
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
198
302
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
201
305
return false;
202
306
}
203
307
204
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
309
if(ret == -1){
206
perror("close");
310
perror_plus("close");
207
311
}
208
312
gpgme_data_release(pgp_data);
209
313
return true;
210
314
}
211
315
212
316
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
214
318
}
215
319
216
320
/* Init GPGME */
217
321
gpgme_check_version(NULL);
218
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
323
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
222
326
return false;
223
327
}
224
328
225
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
226
330
rc = gpgme_get_engine_info(&engine_info);
227
331
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
230
334
return false;
231
335
}
232
336
while(engine_info != NULL){
238
342
engine_info = engine_info->next;
239
343
}
240
344
if(engine_info == NULL){
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
242
347
return false;
243
348
}
244
349
245
350
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
247
352
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
250
356
return false;
251
357
}
252
358
261
367
* Decrypt OpenPGP data.
262
368
* Returns -1 on error
263
369
*/
370
__attribute__((nonnull, warn_unused_result))
264
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
372
size_t crypto_size,
266
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
267
375
gpgme_data_t dh_crypto, dh_plain;
268
376
gpgme_error_t rc;
269
377
ssize_t ret;
271
379
ssize_t plaintext_length = 0;
272
380
273
381
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
383
}
276
384
277
385
/* Create new GPGME data buffer from memory cryptotext */
278
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
387
0);
280
388
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
283
391
return -1;
284
392
}
285
393
286
394
/* Create new empty GPGME data buffer for the plaintext */
287
395
rc = gpgme_data_new(&dh_plain);
288
396
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
291
400
gpgme_data_release(dh_crypto);
292
401
return -1;
293
402
}
294
403
295
404
/* Decrypt data from the cryptotext data buffer to the plaintext
296
405
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
407
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
301
410
plaintext_length = -1;
302
411
if(debug){
303
412
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
305
414
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
416
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
312
421
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
423
}
315
424
gpgme_recipient_t recipient;
316
425
recipient = result->recipients;
317
426
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
324
434
recipient = recipient->next;
325
435
}
326
436
}
329
439
}
330
440
331
441
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
443
}
334
444
335
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
447
perror_plus("gpgme_data_seek");
338
448
plaintext_length = -1;
339
449
goto decrypt_end;
340
450
}
342
452
*plaintext = NULL;
343
453
while(true){
344
454
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
347
457
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
351
461
}
352
462
353
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
468
break;
359
469
}
360
470
if(ret < 0){
361
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
362
472
plaintext_length = -1;
363
473
goto decrypt_end;
364
474
}
366
476
}
367
477
368
478
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
370
480
for(ssize_t i = 0; i < plaintext_length; i++){
371
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
482
}
383
493
return plaintext_length;
384
494
}
385
495
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
389
499
if(ret == NULL)
390
500
ret = "(unknown)";
391
501
return ret;
392
502
}
393
503
394
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
395
506
static void debuggnutls(__attribute__((unused)) int level,
396
507
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
398
509
}
399
510
511
__attribute__((nonnull, warn_unused_result))
400
512
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
402
515
int ret;
403
516
404
517
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
406
519
}
407
520
408
521
ret = gnutls_global_init();
409
522
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
412
525
return -1;
413
526
}
414
527
421
534
}
422
535
423
536
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
425
538
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
431
541
gnutls_global_deinit();
432
542
return -1;
433
543
}
434
544
435
545
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
439
550
}
440
551
441
552
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
443
554
GNUTLS_OPENPGP_FMT_BASE64);
444
555
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
450
561
goto globalfail;
451
562
}
452
563
453
564
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
455
566
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
458
570
goto globalfail;
459
571
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
461
573
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
464
576
goto globalfail;
465
577
}
466
578
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
580
469
581
return 0;
470
582
471
583
globalfail:
472
584
473
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
474
586
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
476
588
return -1;
477
589
}
478
590
479
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
480
594
int ret;
481
595
/* GnuTLS session creation */
482
596
do {
486
600
}
487
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
602
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
491
606
}
492
607
493
608
{
494
609
const char *err;
495
610
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
612
if(quit_now){
498
613
gnutls_deinit(*session);
499
614
return -1;
500
615
}
501
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
617
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
506
621
gnutls_deinit(*session);
507
622
return -1;
508
623
}
510
625
511
626
do {
512
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
628
mc->cred);
514
629
if(quit_now){
515
630
gnutls_deinit(*session);
516
631
return -1;
517
632
}
518
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
634
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
522
637
gnutls_deinit(*session);
523
638
return -1;
524
639
}
526
641
/* ignore client certificate if any. */
527
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
528
643
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
530
645
531
646
return 0;
532
647
}
536
651
__attribute__((unused)) const char *txt){}
537
652
538
653
/* Called when a Mandos server is found */
539
static int start_mandos_communication(const char *ip, uint16_t port,
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
540
656
AvahiIfIndex if_index,
541
int af){
657
int af, mandos_context *mc){
542
658
int ret, tcp_sd = -1;
543
659
ssize_t sret;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
660
struct sockaddr_storage to;
548
661
char *buffer = NULL;
549
662
char *decrypted_buffer = NULL;
550
663
size_t buffer_length = 0;
554
667
gnutls_session_t session;
555
668
int pf; /* Protocol family */
556
669
670
errno = 0;
671
557
672
if(quit_now){
673
errno = EINTR;
558
674
return -1;
559
675
}
560
676
566
682
pf = PF_INET;
567
683
break;
568
684
default:
569
fprintf(stderr, "Bad address family: %d\n", af);
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
686
errno = EINVAL;
570
687
return -1;
571
688
}
572
689
573
ret = init_gnutls_session(&session);
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
574
723
if(ret != 0){
575
724
return -1;
576
725
}
577
726
578
727
if(debug){
579
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
580
"\n", ip, port);
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
581
730
}
582
731
583
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
584
733
if(tcp_sd < 0){
585
perror("socket");
734
int e = errno;
735
perror_plus("socket");
736
errno = e;
586
737
goto mandos_end;
587
738
}
588
739
589
740
if(quit_now){
741
errno = EINTR;
590
742
goto mandos_end;
591
743
}
592
744
593
745
memset(&to, 0, sizeof(to));
594
746
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
597
749
} else { /* IPv4 */
598
to.in.sin_family = (sa_family_t)af;
599
ret = inet_pton(af, ip, &to.in.sin_addr);
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
600
752
}
601
753
if(ret < 0 ){
602
perror("inet_pton");
754
int e = errno;
755
perror_plus("inet_pton");
756
errno = e;
603
757
goto mandos_end;
604
758
}
605
759
if(ret == 0){
606
fprintf(stderr, "Bad address: %s\n", ip);
760
int e = errno;
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
762
errno = e;
607
763
goto mandos_end;
608
764
}
609
765
if(af == AF_INET6){
610
to.in6.sin6_port = htons(port); /* Spurious warnings from
611
-Wconversion and
612
-Wunreachable-code */
613
614
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
615
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
616
-Wunreachable-code*/
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
617
769
if(if_index == AVAHI_IF_UNSPEC){
618
fprintf(stderr, "An IPv6 link-local address is incomplete"
619
" without a network interface\n");
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
772
errno = EINVAL;
620
773
goto mandos_end;
621
774
}
622
775
/* Set the network interface number as scope */
623
to.in6.sin6_scope_id = (uint32_t)if_index;
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
624
777
}
625
778
} else {
626
to.in.sin_port = htons(port); /* Spurious warnings from
627
-Wconversion and
628
-Wunreachable-code */
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
629
780
}
630
781
631
782
if(quit_now){
783
errno = EINTR;
632
784
goto mandos_end;
633
785
}
634
786
636
788
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
637
789
char interface[IF_NAMESIZE];
638
790
if(if_indextoname((unsigned int)if_index, interface) == NULL){
639
perror("if_indextoname");
791
perror_plus("if_indextoname");
640
792
} else {
641
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
642
ip, interface, port);
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
643
795
}
644
796
} else {
645
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
646
port);
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
647
799
}
648
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
649
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
650
const char *pcret;
651
802
if(af == AF_INET6){
652
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
653
sizeof(addrstr));
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
654
807
} else {
655
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
656
sizeof(addrstr));
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
657
812
}
658
if(pcret == NULL){
659
perror("inet_ntop");
660
} else {
661
if(strcmp(addrstr, ip) != 0){
662
fprintf(stderr, "Canonical address form: %s\n", addrstr);
663
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
664
819
}
665
820
}
666
821
667
822
if(quit_now){
823
errno = EINTR;
668
824
goto mandos_end;
669
825
}
670
826
671
827
if(af == AF_INET6){
672
ret = connect(tcp_sd, &to.in6, sizeof(to));
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
673
830
} else {
674
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
675
833
}
676
834
if(ret < 0){
677
perror("connect");
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
int e = errno;
837
perror_plus("connect");
838
errno = e;
839
}
678
840
goto mandos_end;
679
841
}
680
842
681
843
if(quit_now){
844
errno = EINTR;
682
845
goto mandos_end;
683
846
}
684
847
687
850
while(true){
688
851
size_t out_size = strlen(out);
689
852
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
690
out_size - written));
853
out_size - written));
691
854
if(ret == -1){
692
perror("write");
855
int e = errno;
856
perror_plus("write");
857
errno = e;
693
858
goto mandos_end;
694
859
}
695
860
written += (size_t)ret;
705
870
}
706
871
707
872
if(quit_now){
873
errno = EINTR;
708
874
goto mandos_end;
709
875
}
710
876
}
711
877
712
878
if(debug){
713
fprintf(stderr, "Establishing TLS session with %s\n", ip);
879
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
714
880
}
715
881
716
882
if(quit_now){
883
errno = EINTR;
717
884
goto mandos_end;
718
885
}
719
886
720
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
721
892
722
893
if(quit_now){
894
errno = EINTR;
723
895
goto mandos_end;
724
896
}
725
897
726
898
do {
727
899
ret = gnutls_handshake(session);
728
900
if(quit_now){
901
errno = EINTR;
729
902
goto mandos_end;
730
903
}
731
904
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
732
905
733
906
if(ret != GNUTLS_E_SUCCESS){
734
907
if(debug){
735
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
908
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
736
909
gnutls_perror(ret);
737
910
}
911
errno = EPROTO;
738
912
goto mandos_end;
739
913
}
740
914
741
915
/* Read OpenPGP packet that contains the wanted password */
742
916
743
917
if(debug){
744
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
745
ip);
918
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
919
" %s\n", ip);
746
920
}
747
921
748
922
while(true){
749
923
750
924
if(quit_now){
925
errno = EINTR;
751
926
goto mandos_end;
752
927
}
753
928
754
929
buffer_capacity = incbuffer(&buffer, buffer_length,
755
buffer_capacity);
930
buffer_capacity);
756
931
if(buffer_capacity == 0){
757
perror("incbuffer");
932
int e = errno;
933
perror_plus("incbuffer");
934
errno = e;
758
935
goto mandos_end;
759
936
}
760
937
761
938
if(quit_now){
939
errno = EINTR;
762
940
goto mandos_end;
763
941
}
764
942
777
955
ret = gnutls_handshake(session);
778
956
779
957
if(quit_now){
958
errno = EINTR;
780
959
goto mandos_end;
781
960
}
782
961
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
783
962
if(ret < 0){
784
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
963
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
964
"***\n");
785
965
gnutls_perror(ret);
966
errno = EPROTO;
786
967
goto mandos_end;
787
968
}
788
969
break;
789
970
default:
790
fprintf(stderr, "Unknown error while reading data from"
791
" encrypted session with Mandos server\n");
971
fprintf_plus(stderr, "Unknown error while reading data from"
972
" encrypted session with Mandos server\n");
792
973
gnutls_bye(session, GNUTLS_SHUT_RDWR);
974
errno = EIO;
793
975
goto mandos_end;
794
976
}
795
977
} else {
798
980
}
799
981
800
982
if(debug){
801
fprintf(stderr, "Closing TLS session\n");
983
fprintf_plus(stderr, "Closing TLS session\n");
802
984
}
803
985
804
986
if(quit_now){
987
errno = EINTR;
805
988
goto mandos_end;
806
989
}
807
990
808
991
do {
809
992
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
810
993
if(quit_now){
994
errno = EINTR;
811
995
goto mandos_end;
812
996
}
813
997
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
814
998
815
999
if(buffer_length > 0){
816
1000
ssize_t decrypted_buffer_size;
817
decrypted_buffer_size = pgp_packet_decrypt(buffer,
818
buffer_length,
819
&decrypted_buffer);
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
820
1003
if(decrypted_buffer_size >= 0){
821
1004
822
1005
written = 0;
823
1006
while(written < (size_t) decrypted_buffer_size){
824
1007
if(quit_now){
1008
errno = EINTR;
825
1009
goto mandos_end;
826
1010
}
827
1011
829
1013
(size_t)decrypted_buffer_size - written,
830
1014
stdout);
831
1015
if(ret == 0 and ferror(stdout)){
1016
int e = errno;
832
1017
if(debug){
833
fprintf(stderr, "Error writing encrypted data: %s\n",
834
strerror(errno));
1018
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1019
strerror(errno));
835
1020
}
1021
errno = e;
836
1022
goto mandos_end;
837
1023
}
838
1024
written += (size_t)ret;
844
1030
/* Shutdown procedure */
845
1031
846
1032
mandos_end:
847
free(decrypted_buffer);
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
1033
{
1034
int e = errno;
1035
free(decrypted_buffer);
1036
free(buffer);
1037
if(tcp_sd >= 0){
1038
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1039
}
1040
if(ret == -1){
1041
if(e == 0){
1042
e = errno;
1043
}
1044
perror_plus("close");
1045
}
1046
gnutls_deinit(session);
1047
errno = e;
1048
if(quit_now){
1049
errno = EINTR;
1050
retval = -1;
1051
}
858
1052
}
859
1053
return retval;
860
1054
}
861
1055
1056
__attribute__((nonnull))
862
1057
static void resolve_callback(AvahiSServiceResolver *r,
863
1058
AvahiIfIndex interface,
864
1059
AvahiProtocol proto,
872
1067
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
1068
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
1069
flags,
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
877
1074
878
1075
/* Called whenever a service has been resolved successfully or
879
1076
timed out */
880
1077
881
1078
if(quit_now){
1079
avahi_s_service_resolver_free(r);
882
1080
return;
883
1081
}
884
1082
885
1083
switch(event){
886
1084
default:
887
1085
case AVAHI_RESOLVER_FAILURE:
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
1086
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1087
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1088
domain,
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
891
1091
break;
892
1092
893
1093
case AVAHI_RESOLVER_FOUND:
895
1095
char ip[AVAHI_ADDRESS_STR_MAX];
896
1096
avahi_address_snprint(ip, sizeof(ip), address);
897
1097
if(debug){
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
1098
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1099
PRIdMAX ") on port %" PRIu16 "\n", name,
1100
host_name, ip, (intmax_t)interface, port);
901
1101
}
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
904
1106
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
1107
avahi_simple_poll_quit(simple_poll);
1108
} else {
1109
if(not add_server(ip, (in_port_t)port, interface,
1110
avahi_proto_to_af(proto),
1111
&((mandos_context*)mc)->current_server)){
1112
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1113
" list\n", name);
1114
}
906
1115
}
907
1116
}
908
1117
}
918
1127
const char *domain,
919
1128
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
1129
flags,
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
923
1134
924
1135
/* Called whenever a new services becomes available on the LAN or
925
1136
is removed from the LAN */
932
1143
default:
933
1144
case AVAHI_BROWSER_FAILURE:
934
1145
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
1146
fprintf_plus(stderr, "(Avahi browser) %s\n",
1147
avahi_strerror(avahi_server_errno
1148
(((mandos_context*)mc)->server)));
1149
avahi_simple_poll_quit(simple_poll);
938
1150
return;
939
1151
940
1152
case AVAHI_BROWSER_NEW:
943
1155
the callback function is called the Avahi server will free the
944
1156
resolver for us. */
945
1157
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
1158
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1159
interface, protocol, name, type,
1160
domain, protocol, 0,
1161
resolve_callback, mc) == NULL)
1162
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1163
" %s\n", name,
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
951
1166
break;
952
1167
953
1168
case AVAHI_BROWSER_REMOVE:
956
1171
case AVAHI_BROWSER_ALL_FOR_NOW:
957
1172
case AVAHI_BROWSER_CACHE_EXHAUSTED:
958
1173
if(debug){
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1174
fprintf_plus(stderr, "No Mandos server found, still"
1175
" searching...\n");
960
1176
}
961
1177
break;
962
1178
}
963
1179
}
964
1180
965
/* stop main loop after sigterm has been called */
1181
/* Signal handler that stops main loop after SIGTERM */
966
1182
static void handle_sigterm(int sig){
967
1183
if(quit_now){
968
1184
return;
970
1186
quit_now = 1;
971
1187
signal_received = sig;
972
1188
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
1189
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
975
1192
}
976
1193
errno = old_errno;
977
1194
}
978
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1198
int ret;
1199
error_t ret_errno;
1200
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(s < 0){
1203
ret_errno = errno;
1204
perror_plus("socket");
1205
errno = ret_errno;
1206
return false;
1207
}
1208
strcpy(ifr->ifr_name, ifname);
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1210
if(ret == -1){
1211
if(debug){
1212
ret_errno = errno;
1213
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1215
}
1216
return false;
1217
}
1218
return true;
1219
}
1220
1221
__attribute__((nonnull, warn_unused_result))
1222
bool good_flags(const char *ifname, const struct ifreq *ifr){
1223
1224
/* Reject the loopback device */
1225
if(ifr->ifr_flags & IFF_LOOPBACK){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1228
ifname);
1229
}
1230
return false;
1231
}
1232
/* Accept point-to-point devices only if connect_to is specified */
1233
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1234
if(debug){
1235
fprintf_plus(stderr, "Accepting point-to-point interface"
1236
" \"%s\"\n", ifname);
1237
}
1238
return true;
1239
}
1240
/* Otherwise, reject non-broadcast-capable devices */
1241
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1242
if(debug){
1243
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1244
" \"%s\"\n", ifname);
1245
}
1246
return false;
1247
}
1248
/* Reject non-ARP interfaces (including dummy interfaces) */
1249
if(ifr->ifr_flags & IFF_NOARP){
1250
if(debug){
1251
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1252
ifname);
1253
}
1254
return false;
1255
}
1256
1257
/* Accept this device */
1258
if(debug){
1259
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1260
}
1261
return true;
1262
}
1263
979
1264
/*
980
1265
* This function determines if a directory entry in /sys/class/net
981
1266
* corresponds to an acceptable network device.
982
1267
* (This function is passed to scandir(3) as a filter function.)
983
1268
*/
1269
__attribute__((nonnull, warn_unused_result))
984
1270
int good_interface(const struct dirent *if_entry){
985
ssize_t ssret;
986
char *flagname = NULL;
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
988
if_entry->d_name);
989
if(ret < 0){
990
perror("asprintf");
991
return 0;
992
}
993
1271
if(if_entry->d_name[0] == '.'){
994
1272
return 0;
995
1273
}
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
997
if(flags_fd == -1){
998
perror("open");
999
return 0;
1000
}
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1002
/* read line from flags_fd */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1004
char *flagstring = malloc((size_t)to_read);
1005
if(flagstring == NULL){
1006
perror("malloc");
1007
close(flags_fd);
1008
return 0;
1009
}
1010
while(to_read > 0){
1011
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1012
(size_t)to_read));
1013
if(ssret == -1){
1014
perror("read");
1015
free(flagstring);
1016
close(flags_fd);
1017
return 0;
1018
}
1019
to_read -= ssret;
1020
if(ssret == 0){
1274
1275
struct ifreq ifr;
1276
if(not get_flags(if_entry->d_name, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", if_entry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
if(not good_flags(if_entry->d_name, &ifr)){
1285
return 0;
1286
}
1287
return 1;
1288
}
1289
1290
/*
1291
* This function determines if a network interface is up.
1292
*/
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1295
struct ifreq ifr;
1296
if(not get_flags(interface, &ifr)){
1297
if(debug){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1300
}
1301
return false;
1302
}
1303
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1305
}
1306
1307
/*
1308
* This function determines if a network interface is running
1309
*/
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1312
struct ifreq ifr;
1313
if(not get_flags(interface, &ifr)){
1314
if(debug){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1317
}
1318
return false;
1319
}
1320
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1322
}
1323
1324
__attribute__((nonnull, pure, warn_unused_result))
1325
int notdotentries(const struct dirent *direntry){
1326
/* Skip "." and ".." */
1327
if(direntry->d_name[0] == '.'
1328
and (direntry->d_name[1] == '\0'
1329
or (direntry->d_name[1] == '.'
1330
and direntry->d_name[2] == '\0'))){
1331
return 0;
1332
}
1333
return 1;
1334
}
1335
1336
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1338
int runnable_hook(const struct dirent *direntry){
1339
int ret;
1340
size_t sret;
1341
struct stat st;
1342
1343
if((direntry->d_name)[0] == '\0'){
1344
/* Empty name? */
1345
return 0;
1346
}
1347
1348
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
"abcdefghijklmnopqrstuvwxyz"
1350
"0123456789"
1351
"_.-");
1352
if((direntry->d_name)[sret] != '\0'){
1353
/* Contains non-allowed characters */
1354
if(debug){
1355
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1356
direntry->d_name);
1357
}
1358
return 0;
1359
}
1360
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1362
if(ret == -1){
1363
if(debug){
1364
perror_plus("Could not stat hook");
1365
}
1366
return 0;
1367
}
1368
if(not (S_ISREG(st.st_mode))){
1369
/* Not a regular file */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1377
/* Not executable */
1378
if(debug){
1379
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1380
direntry->d_name);
1381
}
1382
return 0;
1383
}
1384
if(debug){
1385
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1386
direntry->d_name);
1387
}
1388
return 1;
1389
}
1390
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1394
int ret;
1395
struct timespec now;
1396
struct timespec waited_time;
1397
intmax_t block_time;
1398
1399
while(true){
1400
if(mc->current_server == NULL){
1401
if(debug){
1402
fprintf_plus(stderr, "Wait until first server is found."
1403
" No timeout!\n");
1404
}
1405
ret = avahi_simple_poll_iterate(s, -1);
1406
} else {
1407
if(debug){
1408
fprintf_plus(stderr, "Check current_server if we should run"
1409
" it, or wait\n");
1410
}
1411
/* the current time */
1412
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1413
if(ret == -1){
1414
perror_plus("clock_gettime");
1415
return -1;
1416
}
1417
/* Calculating in ms how long time between now and server
1418
who we visted longest time ago. Now - last seen. */
1419
waited_time.tv_sec = (now.tv_sec
1420
- mc->current_server->last_seen.tv_sec);
1421
waited_time.tv_nsec = (now.tv_nsec
1422
- mc->current_server->last_seen.tv_nsec);
1423
/* total time is 10s/10,000ms.
1424
Converting to s from ms by dividing by 1,000,
1425
and ns to ms by dividing by 1,000,000. */
1426
block_time = ((retry_interval
1427
- ((intmax_t)waited_time.tv_sec * 1000))
1428
- ((intmax_t)waited_time.tv_nsec / 1000000));
1429
1430
if(debug){
1431
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1432
block_time);
1433
}
1434
1435
if(block_time <= 0){
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1440
if(ret == 0){
1441
avahi_simple_poll_quit(s);
1442
return 0;
1443
}
1444
ret = clock_gettime(CLOCK_MONOTONIC,
1445
&mc->current_server->last_seen);
1446
if(ret == -1){
1447
perror_plus("clock_gettime");
1448
return -1;
1449
}
1450
mc->current_server = mc->current_server->next;
1451
block_time = 0; /* Call avahi to find new Mandos
1452
servers, but don't block */
1453
}
1454
1455
ret = avahi_simple_poll_iterate(s, (int)block_time);
1456
}
1457
if(ret != 0){
1458
if(ret > 0 or errno != EINTR){
1459
return (ret != 1) ? ret : 0;
1460
}
1461
}
1462
}
1463
}
1464
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1471
ret_errno = errno;
1472
}
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1482
if(ret_errno != 0){
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
if(setuid(0) == -1){
1487
ret_errno = errno;
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1499
ret_errno = errno;
1500
}
1501
errno = old_errno;
1502
return ret_errno;
1503
}
1504
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1511
ret_errno = errno;
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1519
const float delay){
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1525
if(debug){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1528
}
1529
} else {
1530
perror_plus("open");
1531
}
1532
return;
1533
}
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1547
if(numhooks == -1){
1548
perror_plus("scandir");
1549
return;
1550
}
1551
struct dirent *direntry;
1552
int ret;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1556
if(debug){
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1558
direntry->d_name);
1559
}
1560
pid_t hook_pid = fork();
1561
if(hook_pid == 0){
1562
/* Child */
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1565
if(errno != 0){
1566
perror_plus("Failed to raise privileges");
1567
_exit(EX_NOPERM);
1568
}
1569
/* Set group */
1570
errno = 0;
1571
ret = setgid(0);
1572
if(ret == -1){
1573
perror_plus("setgid");
1574
_exit(EX_NOPERM);
1575
}
1576
/* Reset supplementary groups */
1577
errno = 0;
1578
ret = setgroups(0, NULL);
1579
if(ret == -1){
1580
perror_plus("setgroups");
1581
_exit(EX_NOPERM);
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
ret = setenv("DEVICE", interface, 1);
1604
if(ret == -1){
1605
perror_plus("setenv");
1606
_exit(EX_OSERR);
1607
}
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
if(ret == -1){
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("MODE", mode, 1);
1614
if(ret == -1){
1615
perror_plus("setenv");
1616
_exit(EX_OSERR);
1617
}
1618
char *delaystring;
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1620
if(ret == -1){
1621
perror_plus("asprintf");
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1626
free(delaystring);
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
free(delaystring);
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1633
if(ret == -1){
1634
perror_plus("setenv");
1635
_exit(EX_OSERR);
1636
}
1637
}
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
if(hook_fd == -1){
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1642
}
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1646
}
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
environ) == -1){
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1651
}
1652
} else {
1653
if(hook_pid == -1){
1654
perror_plus("fork");
1655
free(direntry);
1656
continue;
1657
}
1658
int status;
1659
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1660
perror_plus("waitpid");
1661
free(direntry);
1662
continue;
1663
}
1664
if(WIFEXITED(status)){
1665
if(WEXITSTATUS(status) != 0){
1666
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1667
" with status %d\n", direntry->d_name,
1668
WEXITSTATUS(status));
1669
free(direntry);
1670
continue;
1671
}
1672
} else if(WIFSIGNALED(status)){
1673
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1674
" signal %d\n", direntry->d_name,
1675
WTERMSIG(status));
1676
free(direntry);
1677
continue;
1678
} else {
1679
fprintf_plus(stderr, "Warning: network hook \"%s\""
1680
" crashed\n", direntry->d_name);
1681
free(direntry);
1682
continue;
1683
}
1684
}
1685
if(debug){
1686
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1687
direntry->d_name);
1688
}
1689
free(direntry);
1690
}
1691
free(direntries);
1692
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1693
perror_plus("close");
1694
} else {
1695
hookdir_fd = -1;
1696
}
1697
close(devnull);
1698
}
1699
1700
__attribute__((nonnull, warn_unused_result))
1701
error_t bring_up_interface(const char *const interface,
1702
const float delay){
1703
error_t old_errno = errno;
1704
int ret;
1705
struct ifreq network;
1706
unsigned int if_index = if_nametoindex(interface);
1707
if(if_index == 0){
1708
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1709
errno = old_errno;
1710
return ENXIO;
1711
}
1712
1713
if(quit_now){
1714
errno = old_errno;
1715
return EINTR;
1716
}
1717
1718
if(not interface_is_up(interface)){
1719
error_t ret_errno = 0, ioctl_errno = 0;
1720
if(not get_flags(interface, &network)){
1721
ret_errno = errno;
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1723
"\"%s\"\n", interface);
1724
errno = old_errno;
1725
return ret_errno;
1726
}
1727
network.ifr_flags |= IFF_UP; /* set flag */
1728
1729
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1730
if(sd == -1){
1731
ret_errno = errno;
1732
perror_plus("socket");
1733
errno = old_errno;
1734
return ret_errno;
1735
}
1736
1737
if(quit_now){
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
errno = old_errno;
1743
return EINTR;
1744
}
1745
1746
if(debug){
1747
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1748
interface);
1749
}
1750
1751
/* Raise privileges */
1752
ret_errno = raise_privileges();
1753
if(ret_errno != 0){
1754
errno = ret_errno;
1755
perror_plus("Failed to raise privileges");
1756
}
1757
1758
#ifdef __linux__
1759
int ret_linux;
1760
bool restore_loglevel = false;
1761
if(ret_errno == 0){
1762
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1763
messages about the network interface to mess up the prompt */
1764
ret_linux = klogctl(8, NULL, 5);
1765
if(ret_linux == -1){
1766
perror_plus("klogctl");
1767
} else {
1768
restore_loglevel = true;
1769
}
1770
}
1771
#endif /* __linux__ */
1772
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1773
ioctl_errno = errno;
1774
#ifdef __linux__
1775
if(restore_loglevel){
1776
ret_linux = klogctl(7, NULL, 0);
1777
if(ret_linux == -1){
1778
perror_plus("klogctl");
1779
}
1780
}
1781
#endif /* __linux__ */
1782
1783
/* If raise_privileges() succeeded above */
1784
if(ret_errno == 0){
1785
/* Lower privileges */
1786
ret_errno = lower_privileges();
1787
if(ret_errno != 0){
1788
errno = ret_errno;
1789
perror_plus("Failed to lower privileges");
1790
}
1791
}
1792
1793
/* Close the socket */
1794
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1795
if(ret == -1){
1796
perror_plus("close");
1797
}
1798
1799
if(ret_setflags == -1){
1800
errno = ioctl_errno;
1801
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1802
errno = old_errno;
1803
return ioctl_errno;
1804
}
1805
} else if(debug){
1806
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1807
interface);
1808
}
1809
1810
/* Sleep checking until interface is running.
1811
Check every 0.25s, up to total time of delay */
1812
for(int i=0; i < delay * 4; i++){
1813
if(interface_is_running(interface)){
1021
1814
break;
1022
1815
}
1023
}
1024
close(flags_fd);
1025
intmax_t tmpmax;
1026
char *tmp;
1027
errno = 0;
1028
tmpmax = strtoimax(flagstring, &tmp, 0);
1029
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1030
and not (isspace(*tmp)))
1031
or tmpmax != (ifreq_flags)tmpmax){
1032
free(flagstring);
1033
return 0;
1034
}
1035
free(flagstring);
1036
ifreq_flags flags = (ifreq_flags)tmpmax;
1037
/* Reject the loopback device */
1038
if(flags & IFF_LOOPBACK){
1039
return 0;
1040
}
1041
/* Accept point-to-point devices only if connect_to is specified */
1042
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1043
return 1;
1044
}
1045
/* Otherwise, reject non-broadcast-capable devices */
1046
if(not (flags & IFF_BROADCAST)){
1047
return 0;
1048
}
1049
/* Accept this device */
1050
return 1;
1816
struct timespec sleeptime = { .tv_nsec = 250000000 };
1817
ret = nanosleep(&sleeptime, NULL);
1818
if(ret == -1 and errno != EINTR){
1819
perror_plus("nanosleep");
1820
}
1821
}
1822
1823
errno = old_errno;
1824
return 0;
1825
}
1826
1827
__attribute__((nonnull, warn_unused_result))
1828
error_t take_down_interface(const char *const interface){
1829
error_t old_errno = errno;
1830
struct ifreq network;
1831
unsigned int if_index = if_nametoindex(interface);
1832
if(if_index == 0){
1833
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1834
errno = old_errno;
1835
return ENXIO;
1836
}
1837
if(interface_is_up(interface)){
1838
error_t ret_errno = 0, ioctl_errno = 0;
1839
if(not get_flags(interface, &network) and debug){
1840
ret_errno = errno;
1841
fprintf_plus(stderr, "Failed to get flags for interface "
1842
"\"%s\"\n", interface);
1843
errno = old_errno;
1844
return ret_errno;
1845
}
1846
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1847
1848
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd == -1){
1850
ret_errno = errno;
1851
perror_plus("socket");
1852
errno = old_errno;
1853
return ret_errno;
1854
}
1855
1856
if(debug){
1857
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1858
interface);
1859
}
1860
1861
/* Raise privileges */
1862
ret_errno = raise_privileges();
1863
if(ret_errno != 0){
1864
errno = ret_errno;
1865
perror_plus("Failed to raise privileges");
1866
}
1867
1868
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1869
ioctl_errno = errno;
1870
1871
/* If raise_privileges() succeeded above */
1872
if(ret_errno == 0){
1873
/* Lower privileges */
1874
ret_errno = lower_privileges();
1875
if(ret_errno != 0){
1876
errno = ret_errno;
1877
perror_plus("Failed to lower privileges");
1878
}
1879
}
1880
1881
/* Close the socket */
1882
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1883
if(ret == -1){
1884
perror_plus("close");
1885
}
1886
1887
if(ret_setflags == -1){
1888
errno = ioctl_errno;
1889
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1890
errno = old_errno;
1891
return ioctl_errno;
1892
}
1893
} else if(debug){
1894
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1895
interface);
1896
}
1897
1898
errno = old_errno;
1899
return 0;
1051
1900
}
1052
1901
1053
1902
int main(int argc, char *argv[]){
1903
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1904
.priority = "SECURE256:!CTYPE-X.509:"
1905
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
1906
.interfaces = NULL, .interfaces_size = 0 };
1054
1907
AvahiSServiceBrowser *sb = NULL;
1055
int error;
1908
error_t ret_errno;
1056
1909
int ret;
1057
1910
intmax_t tmpmax;
1058
1911
char *tmp;
1059
1912
int exitcode = EXIT_SUCCESS;
1060
const char *interface = "";
1061
struct ifreq network;
1062
int sd = -1;
1063
bool take_down_interface = false;
1064
uid_t uid;
1065
gid_t gid;
1066
char tempdir[] = "/tmp/mandosXXXXXX";
1067
bool tempdir_created = false;
1913
char *interfaces_to_take_down = NULL;
1914
size_t interfaces_to_take_down_size = 0;
1915
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1916
char old_tempdir[] = "/tmp/mandosXXXXXX";
1917
char *tempdir = NULL;
1068
1918
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1069
1919
const char *seckey = PATHDIR "/" SECKEY;
1070
1920
const char *pubkey = PATHDIR "/" PUBKEY;
1921
char *interfaces_hooks = NULL;
1071
1922
1072
1923
bool gnutls_initialized = false;
1073
1924
bool gpgme_initialized = false;
1074
1925
float delay = 2.5f;
1926
double retry_interval = 10; /* 10s between trying a server and
1927
retrying the same server again */
1075
1928
1076
1929
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1077
1930
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1083
1936
errno = 0;
1084
1937
ret = setgid(gid);
1085
1938
if(ret == -1){
1086
perror("setgid");
1939
perror_plus("setgid");
1087
1940
}
1088
1941
1089
1942
/* Lower user privileges (temporarily) */
1090
1943
errno = 0;
1091
1944
ret = seteuid(uid);
1092
1945
if(ret == -1){
1093
perror("seteuid");
1946
perror_plus("seteuid");
1094
1947
}
1095
1948
1096
1949
if(quit_now){
1131
1984
.arg = "SECONDS",
1132
1985
.doc = "Maximum delay to wait for interface startup",
1133
1986
.group = 2 },
1987
{ .name = "retry", .key = 132,
1988
.arg = "SECONDS",
1989
.doc = "Retry interval used when denied by the Mandos server",
1990
.group = 2 },
1991
{ .name = "network-hook-dir", .key = 133,
1992
.arg = "DIR",
1993
.doc = "Directory where network hooks are located",
1994
.group = 2 },
1995
/*
1996
* These reproduce what we would get without ARGP_NO_HELP
1997
*/
1998
{ .name = "help", .key = '?',
1999
.doc = "Give this help list", .group = -1 },
2000
{ .name = "usage", .key = -3,
2001
.doc = "Give a short usage message", .group = -1 },
2002
{ .name = "version", .key = 'V',
2003
.doc = "Print program version", .group = -1 },
1134
2004
{ .name = NULL }
1135
2005
};
1136
2006
1137
2007
error_t parse_opt(int key, char *arg,
1138
2008
struct argp_state *state){
2009
errno = 0;
1139
2010
switch(key){
1140
2011
case 128: /* --debug */
1141
2012
debug = true;
1144
2015
connect_to = arg;
1145
2016
break;
1146
2017
case 'i': /* --interface */
1147
interface = arg;
2018
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2019
arg, (int)',');
2020
if(ret_errno != 0){
2021
argp_error(state, "%s", strerror(ret_errno));
2022
}
1148
2023
break;
1149
2024
case 's': /* --seckey */
1150
2025
seckey = arg;
1157
2032
tmpmax = strtoimax(arg, &tmp, 10);
1158
2033
if(errno != 0 or tmp == arg or *tmp != '\0'
1159
2034
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1160
fprintf(stderr, "Bad number of DH bits\n");
1161
exit(EXIT_FAILURE);
2035
argp_error(state, "Bad number of DH bits");
1162
2036
}
1163
2037
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1164
2038
break;
1169
2043
errno = 0;
1170
2044
delay = strtof(arg, &tmp);
1171
2045
if(errno != 0 or tmp == arg or *tmp != '\0'){
1172
fprintf(stderr, "Bad delay\n");
1173
exit(EXIT_FAILURE);
1174
}
1175
break;
1176
case ARGP_KEY_ARG:
1177
argp_usage(state);
1178
case ARGP_KEY_END:
2046
argp_error(state, "Bad delay");
2047
}
2048
case 132: /* --retry */
2049
errno = 0;
2050
retry_interval = strtod(arg, &tmp);
2051
if(errno != 0 or tmp == arg or *tmp != '\0'
2052
or (retry_interval * 1000) > INT_MAX
2053
or retry_interval < 0){
2054
argp_error(state, "Bad retry interval");
2055
}
2056
break;
2057
case 133: /* --network-hook-dir */
2058
hookdir = arg;
2059
break;
2060
/*
2061
* These reproduce what we would get without ARGP_NO_HELP
2062
*/
2063
case '?': /* --help */
2064
argp_state_help(state, state->out_stream,
2065
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2066
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2067
case -3: /* --usage */
2068
argp_state_help(state, state->out_stream,
2069
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2070
case 'V': /* --version */
2071
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2072
exit(argp_err_exit_status);
1179
2073
break;
1180
2074
default:
1181
2075
return ARGP_ERR_UNKNOWN;
1182
2076
}
1183
return 0;
2077
return errno;
1184
2078
}
1185
2079
1186
2080
struct argp argp = { .options = options, .parser = parse_opt,
1187
2081
.args_doc = "",
1188
2082
.doc = "Mandos client -- Get and decrypt"
1189
2083
" passwords from a Mandos server" };
1190
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1191
if(ret == ARGP_ERR_UNKNOWN){
1192
fprintf(stderr, "Unknown error while parsing arguments\n");
1193
exitcode = EXIT_FAILURE;
1194
goto end;
1195
}
2084
ret = argp_parse(&argp, argc, argv,
2085
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2086
switch(ret){
2087
case 0:
2088
break;
2089
case ENOMEM:
2090
default:
2091
errno = ret;
2092
perror_plus("argp_parse");
2093
exitcode = EX_OSERR;
2094
goto end;
2095
case EINVAL:
2096
exitcode = EX_USAGE;
2097
goto end;
2098
}
2099
}
2100
2101
{
2102
/* Work around Debian bug #633582:
2103
<http://bugs.debian.org/633582> */
2104
2105
/* Re-raise privileges */
2106
ret_errno = raise_privileges();
2107
if(ret_errno != 0){
2108
errno = ret_errno;
2109
perror_plus("Failed to raise privileges");
2110
} else {
2111
struct stat st;
2112
2113
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2114
int seckey_fd = open(seckey, O_RDONLY);
2115
if(seckey_fd == -1){
2116
perror_plus("open");
2117
} else {
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2119
if(ret == -1){
2120
perror_plus("fstat");
2121
} else {
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(seckey_fd, uid, gid);
2125
if(ret == -1){
2126
perror_plus("fchown");
2127
}
2128
}
2129
}
2130
TEMP_FAILURE_RETRY(close(seckey_fd));
2131
}
2132
}
2133
2134
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2135
int pubkey_fd = open(pubkey, O_RDONLY);
2136
if(pubkey_fd == -1){
2137
perror_plus("open");
2138
} else {
2139
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2140
if(ret == -1){
2141
perror_plus("fstat");
2142
} else {
2143
if(S_ISREG(st.st_mode)
2144
and st.st_uid == 0 and st.st_gid == 0){
2145
ret = fchown(pubkey_fd, uid, gid);
2146
if(ret == -1){
2147
perror_plus("fchown");
2148
}
2149
}
2150
}
2151
TEMP_FAILURE_RETRY(close(pubkey_fd));
2152
}
2153
}
2154
2155
/* Lower privileges */
2156
ret_errno = lower_privileges();
2157
if(ret_errno != 0){
2158
errno = ret_errno;
2159
perror_plus("Failed to lower privileges");
2160
}
2161
}
2162
}
2163
2164
/* Remove invalid interface names (except "none") */
2165
{
2166
char *interface = NULL;
2167
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2168
interface))){
2169
if(strcmp(interface, "none") != 0
2170
and if_nametoindex(interface) == 0){
2171
if(interface[0] != '\0'){
2172
fprintf_plus(stderr, "Not using nonexisting interface"
2173
" \"%s\"\n", interface);
2174
}
2175
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2176
interface = NULL;
2177
}
2178
}
2179
}
2180
2181
/* Run network hooks */
2182
{
2183
if(mc.interfaces != NULL){
2184
interfaces_hooks = malloc(mc.interfaces_size);
2185
if(interfaces_hooks == NULL){
2186
perror_plus("malloc");
2187
goto end;
2188
}
2189
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2190
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2191
}
2192
run_network_hooks("start", interfaces_hooks != NULL ?
2193
interfaces_hooks : "", delay);
1196
2194
}
1197
2195
1198
2196
if(not debug){
1199
2197
avahi_set_log_function(empty_log);
1200
2198
}
1201
1202
if(interface[0] == '\0'){
1203
struct dirent **direntries;
1204
ret = scandir(sys_class_net, &direntries, good_interface,
1205
alphasort);
1206
if(ret >= 1){
1207
/* Pick the first good interface */
1208
interface = strdup(direntries[0]->d_name);
1209
if(interface == NULL){
1210
perror("malloc");
1211
free(direntries);
1212
exitcode = EXIT_FAILURE;
1213
goto end;
1214
}
1215
free(direntries);
1216
} else {
1217
free(direntries);
1218
fprintf(stderr, "Could not find a network interface\n");
1219
exitcode = EXIT_FAILURE;
1220
goto end;
1221
}
1222
}
1223
2199
1224
2200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1225
2201
from the signal handler */
1226
2202
/* Initialize the pseudo-RNG for Avahi */
1227
2203
srand((unsigned int) time(NULL));
1228
mc.simple_poll = avahi_simple_poll_new();
1229
if(mc.simple_poll == NULL){
1230
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1231
exitcode = EXIT_FAILURE;
2204
simple_poll = avahi_simple_poll_new();
2205
if(simple_poll == NULL){
2206
fprintf_plus(stderr,
2207
"Avahi: Failed to create simple poll object.\n");
2208
exitcode = EX_UNAVAILABLE;
1232
2209
goto end;
1233
2210
}
1234
2211
1235
2212
sigemptyset(&sigterm_action.sa_mask);
1236
2213
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1237
2214
if(ret == -1){
1238
perror("sigaddset");
1239
exitcode = EXIT_FAILURE;
2215
perror_plus("sigaddset");
2216
exitcode = EX_OSERR;
1240
2217
goto end;
1241
2218
}
1242
2219
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1243
2220
if(ret == -1){
1244
perror("sigaddset");
1245
exitcode = EXIT_FAILURE;
2221
perror_plus("sigaddset");
2222
exitcode = EX_OSERR;
1246
2223
goto end;
1247
2224
}
1248
2225
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1249
2226
if(ret == -1){
1250
perror("sigaddset");
1251
exitcode = EXIT_FAILURE;
2227
perror_plus("sigaddset");
2228
exitcode = EX_OSERR;
1252
2229
goto end;
1253
2230
}
1254
2231
/* Need to check if the handler is SIG_IGN before handling:
1257
2234
*/
1258
2235
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1259
2236
if(ret == -1){
1260
perror("sigaction");
1261
return EXIT_FAILURE;
2237
perror_plus("sigaction");
2238
return EX_OSERR;
1262
2239
}
1263
2240
if(old_sigterm_action.sa_handler != SIG_IGN){
1264
2241
ret = sigaction(SIGINT, &sigterm_action, NULL);
1265
2242
if(ret == -1){
1266
perror("sigaction");
1267
exitcode = EXIT_FAILURE;
2243
perror_plus("sigaction");
2244
exitcode = EX_OSERR;
1268
2245
goto end;
1269
2246
}
1270
2247
}
1271
2248
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1272
2249
if(ret == -1){
1273
perror("sigaction");
1274
return EXIT_FAILURE;
2250
perror_plus("sigaction");
2251
return EX_OSERR;
1275
2252
}
1276
2253
if(old_sigterm_action.sa_handler != SIG_IGN){
1277
2254
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1278
2255
if(ret == -1){
1279
perror("sigaction");
1280
exitcode = EXIT_FAILURE;
2256
perror_plus("sigaction");
2257
exitcode = EX_OSERR;
1281
2258
goto end;
1282
2259
}
1283
2260
}
1284
2261
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1285
2262
if(ret == -1){
1286
perror("sigaction");
1287
return EXIT_FAILURE;
2263
perror_plus("sigaction");
2264
return EX_OSERR;
1288
2265
}
1289
2266
if(old_sigterm_action.sa_handler != SIG_IGN){
1290
2267
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1291
2268
if(ret == -1){
1292
perror("sigaction");
1293
exitcode = EXIT_FAILURE;
1294
goto end;
1295
}
1296
}
1297
1298
/* If the interface is down, bring it up */
1299
if(strcmp(interface, "none") != 0){
1300
if_index = (AvahiIfIndex) if_nametoindex(interface);
1301
if(if_index == 0){
1302
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1303
exitcode = EXIT_FAILURE;
1304
goto end;
1305
}
1306
1307
if(quit_now){
1308
goto end;
1309
}
1310
1311
/* Re-raise priviliges */
1312
errno = 0;
1313
ret = seteuid(0);
1314
if(ret == -1){
1315
perror("seteuid");
1316
}
1317
1318
#ifdef __linux__
1319
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1320
messages to mess up the prompt */
1321
ret = klogctl(8, NULL, 5);
1322
bool restore_loglevel = true;
1323
if(ret == -1){
1324
restore_loglevel = false;
1325
perror("klogctl");
1326
}
1327
#endif /* __linux__ */
1328
1329
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1330
if(sd < 0){
1331
perror("socket");
1332
exitcode = EXIT_FAILURE;
1333
#ifdef __linux__
1334
if(restore_loglevel){
1335
ret = klogctl(7, NULL, 0);
1336
if(ret == -1){
1337
perror("klogctl");
1338
}
1339
}
1340
#endif /* __linux__ */
1341
/* Lower privileges */
1342
errno = 0;
1343
ret = seteuid(uid);
1344
if(ret == -1){
1345
perror("seteuid");
1346
}
1347
goto end;
1348
}
1349
strcpy(network.ifr_name, interface);
1350
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1351
if(ret == -1){
1352
perror("ioctl SIOCGIFFLAGS");
1353
#ifdef __linux__
1354
if(restore_loglevel){
1355
ret = klogctl(7, NULL, 0);
1356
if(ret == -1){
1357
perror("klogctl");
1358
}
1359
}
1360
#endif /* __linux__ */
1361
exitcode = EXIT_FAILURE;
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
if((network.ifr_flags & IFF_UP) == 0){
1371
network.ifr_flags |= IFF_UP;
1372
take_down_interface = true;
1373
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1374
if(ret == -1){
1375
take_down_interface = false;
1376
perror("ioctl SIOCSIFFLAGS");
1377
exitcode = EXIT_FAILURE;
1378
#ifdef __linux__
1379
if(restore_loglevel){
1380
ret = klogctl(7, NULL, 0);
1381
if(ret == -1){
1382
perror("klogctl");
2269
perror_plus("sigaction");
2270
exitcode = EX_OSERR;
2271
goto end;
2272
}
2273
}
2274
2275
/* If no interfaces were specified, make a list */
2276
if(mc.interfaces == NULL){
2277
struct dirent **direntries = NULL;
2278
/* Look for any good interfaces */
2279
ret = scandir(sys_class_net, &direntries, good_interface,
2280
alphasort);
2281
if(ret >= 1){
2282
/* Add all found interfaces to interfaces list */
2283
for(int i = 0; i < ret; ++i){
2284
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2285
direntries[i]->d_name);
2286
if(ret_errno != 0){
2287
errno = ret_errno;
2288
perror_plus("argz_add");
2289
free(direntries[i]);
2290
continue;
2291
}
2292
if(debug){
2293
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2294
direntries[i]->d_name);
2295
}
2296
free(direntries[i]);
2297
}
2298
free(direntries);
2299
} else {
2300
if(ret == 0){
2301
free(direntries);
2302
}
2303
fprintf_plus(stderr, "Could not find a network interface\n");
2304
exitcode = EXIT_FAILURE;
2305
goto end;
2306
}
2307
}
2308
2309
/* Bring up interfaces which are down, and remove any "none"s */
2310
{
2311
char *interface = NULL;
2312
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2313
interface))){
2314
/* If interface name is "none", stop bringing up interfaces.
2315
Also remove all instances of "none" from the list */
2316
if(strcmp(interface, "none") == 0){
2317
argz_delete(&mc.interfaces, &mc.interfaces_size,
2318
interface);
2319
interface = NULL;
2320
while((interface = argz_next(mc.interfaces,
2321
mc.interfaces_size, interface))){
2322
if(strcmp(interface, "none") == 0){
2323
argz_delete(&mc.interfaces, &mc.interfaces_size,
2324
interface);
2325
interface = NULL;
1383
2326
}
1384
2327
}
1385
#endif /* __linux__ */
1386
/* Lower privileges */
1387
errno = 0;
1388
ret = seteuid(uid);
1389
if(ret == -1){
1390
perror("seteuid");
1391
}
1392
goto end;
1393
}
1394
}
1395
/* sleep checking until interface is running */
1396
for(int i=0; i < delay * 4; i++){
1397
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1398
if(ret == -1){
1399
perror("ioctl SIOCGIFFLAGS");
1400
} else if(network.ifr_flags & IFF_RUNNING){
1401
2328
break;
1402
2329
}
1403
struct timespec sleeptime = { .tv_nsec = 250000000 };
1404
ret = nanosleep(&sleeptime, NULL);
1405
if(ret == -1 and errno != EINTR){
1406
perror("nanosleep");
1407
}
1408
}
1409
if(not take_down_interface){
1410
/* We won't need the socket anymore */
1411
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1412
if(ret == -1){
1413
perror("close");
1414
}
1415
}
1416
#ifdef __linux__
1417
if(restore_loglevel){
1418
/* Restores kernel loglevel to default */
1419
ret = klogctl(7, NULL, 0);
1420
if(ret == -1){
1421
perror("klogctl");
1422
}
1423
}
1424
#endif /* __linux__ */
1425
/* Lower privileges */
1426
errno = 0;
1427
if(take_down_interface){
1428
/* Lower privileges */
1429
ret = seteuid(uid);
1430
if(ret == -1){
1431
perror("seteuid");
1432
}
1433
} else {
1434
/* Lower privileges permanently */
1435
ret = setuid(uid);
1436
if(ret == -1){
1437
perror("setuid");
1438
}
1439
}
2330
bool interface_was_up = interface_is_up(interface);
2331
errno = bring_up_interface(interface, delay);
2332
if(not interface_was_up){
2333
if(errno != 0){
2334
perror_plus("Failed to bring up interface");
2335
} else {
2336
errno = argz_add(&interfaces_to_take_down,
2337
&interfaces_to_take_down_size,
2338
interface);
2339
if(errno != 0){
2340
perror_plus("argz_add");
2341
}
2342
}
2343
}
2344
}
2345
if(debug and (interfaces_to_take_down == NULL)){
2346
fprintf_plus(stderr, "No interfaces were brought up\n");
2347
}
2348
}
2349
2350
/* If we only got one interface, explicitly use only that one */
2351
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2352
if(debug){
2353
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2354
mc.interfaces);
2355
}
2356
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1440
2357
}
1441
2358
1442
2359
if(quit_now){
1443
2360
goto end;
1444
2361
}
1445
2362
1446
ret = init_gnutls_global(pubkey, seckey);
2363
ret = init_gnutls_global(pubkey, seckey, &mc);
1447
2364
if(ret == -1){
1448
fprintf(stderr, "init_gnutls_global failed\n");
1449
exitcode = EXIT_FAILURE;
2365
fprintf_plus(stderr, "init_gnutls_global failed\n");
2366
exitcode = EX_UNAVAILABLE;
1450
2367
goto end;
1451
2368
} else {
1452
2369
gnutls_initialized = true;
1456
2373
goto end;
1457
2374
}
1458
2375
1459
tempdir_created = true;
1460
if(mkdtemp(tempdir) == NULL){
1461
tempdir_created = false;
1462
perror("mkdtemp");
2376
/* Try /run/tmp before /tmp */
2377
tempdir = mkdtemp(run_tempdir);
2378
if(tempdir == NULL and errno == ENOENT){
2379
if(debug){
2380
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2381
run_tempdir, old_tempdir);
2382
}
2383
tempdir = mkdtemp(old_tempdir);
2384
}
2385
if(tempdir == NULL){
2386
perror_plus("mkdtemp");
1463
2387
goto end;
1464
2388
}
1465
2389
1467
2391
goto end;
1468
2392
}
1469
2393
1470
if(not init_gpgme(pubkey, seckey, tempdir)){
1471
fprintf(stderr, "init_gpgme failed\n");
1472
exitcode = EXIT_FAILURE;
2394
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2395
fprintf_plus(stderr, "init_gpgme failed\n");
2396
exitcode = EX_UNAVAILABLE;
1473
2397
goto end;
1474
2398
} else {
1475
2399
gpgme_initialized = true;
1483
2407
/* Connect directly, do not use Zeroconf */
1484
2408
/* (Mainly meant for debugging) */
1485
2409
char *address = strrchr(connect_to, ':');
2410
1486
2411
if(address == NULL){
1487
fprintf(stderr, "No colon in address\n");
1488
exitcode = EXIT_FAILURE;
2412
fprintf_plus(stderr, "No colon in address\n");
2413
exitcode = EX_USAGE;
1489
2414
goto end;
1490
2415
}
1491
2416
1493
2418
goto end;
1494
2419
}
1495
2420
1496
uint16_t port;
2421
in_port_t port;
1497
2422
errno = 0;
1498
2423
tmpmax = strtoimax(address+1, &tmp, 10);
1499
2424
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1500
or tmpmax != (uint16_t)tmpmax){
1501
fprintf(stderr, "Bad port number\n");
1502
exitcode = EXIT_FAILURE;
2425
or tmpmax != (in_port_t)tmpmax){
2426
fprintf_plus(stderr, "Bad port number\n");
2427
exitcode = EX_USAGE;
1503
2428
goto end;
1504
2429
}
1505
2430
1506
2431
if(quit_now){
1507
2432
goto end;
1508
2433
}
1509
2434
1510
port = (uint16_t)tmpmax;
2435
port = (in_port_t)tmpmax;
1511
2436
*address = '\0';
1512
address = connect_to;
1513
2437
/* Colon in address indicates IPv6 */
1514
2438
int af;
1515
if(strchr(address, ':') != NULL){
2439
if(strchr(connect_to, ':') != NULL){
1516
2440
af = AF_INET6;
2441
/* Accept [] around IPv6 address - see RFC 5952 */
2442
if(connect_to[0] == '[' and address[-1] == ']')
2443
{
2444
connect_to++;
2445
address[-1] = '\0';
2446
}
1517
2447
} else {
1518
2448
af = AF_INET;
1519
2449
}
2450
address = connect_to;
1520
2451
1521
2452
if(quit_now){
1522
2453
goto end;
1523
2454
}
1524
2455
1525
ret = start_mandos_communication(address, port, if_index, af);
1526
if(ret < 0){
1527
exitcode = EXIT_FAILURE;
1528
} else {
2456
while(not quit_now){
2457
ret = start_mandos_communication(address, port, if_index, af,
2458
&mc);
2459
if(quit_now or ret == 0){
2460
break;
2461
}
2462
if(debug){
2463
fprintf_plus(stderr, "Retrying in %d seconds\n",
2464
(int)retry_interval);
2465
}
2466
sleep((unsigned int)retry_interval);
2467
}
2468
2469
if(not quit_now){
1529
2470
exitcode = EXIT_SUCCESS;
1530
2471
}
2472
1531
2473
goto end;
1532
2474
}
1533
2475
1545
2487
config.publish_domain = 0;
1546
2488
1547
2489
/* Allocate a new server */
1548
mc.server = avahi_server_new(avahi_simple_poll_get
1549
(mc.simple_poll), &config, NULL,
1550
NULL, &error);
2490
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2491
&config, NULL, NULL, &ret_errno);
1551
2492
1552
2493
/* Free the Avahi configuration data */
1553
2494
avahi_server_config_free(&config);
1555
2496
1556
2497
/* Check if creating the Avahi server object succeeded */
1557
2498
if(mc.server == NULL){
1558
fprintf(stderr, "Failed to create Avahi server: %s\n",
1559
avahi_strerror(error));
1560
exitcode = EXIT_FAILURE;
2499
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2500
avahi_strerror(ret_errno));
2501
exitcode = EX_UNAVAILABLE;
1561
2502
goto end;
1562
2503
}
1563
2504
1568
2509
/* Create the Avahi service browser */
1569
2510
sb = avahi_s_service_browser_new(mc.server, if_index,
1570
2511
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1571
NULL, 0, browse_callback, NULL);
2512
NULL, 0, browse_callback,
2513
(void *)&mc);
1572
2514
if(sb == NULL){
1573
fprintf(stderr, "Failed to create service browser: %s\n",
1574
avahi_strerror(avahi_server_errno(mc.server)));
1575
exitcode = EXIT_FAILURE;
2515
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2516
avahi_strerror(avahi_server_errno(mc.server)));
2517
exitcode = EX_UNAVAILABLE;
1576
2518
goto end;
1577
2519
}
1578
2520
1583
2525
/* Run the main loop */
1584
2526
1585
2527
if(debug){
1586
fprintf(stderr, "Starting Avahi loop search\n");
2528
fprintf_plus(stderr, "Starting Avahi loop search\n");
1587
2529
}
1588
2530
1589
avahi_simple_poll_loop(mc.simple_poll);
2531
ret = avahi_loop_with_timeout(simple_poll,
2532
(int)(retry_interval * 1000), &mc);
2533
if(debug){
2534
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2535
(ret == 0) ? "successfully" : "with error");
2536
}
1590
2537
1591
2538
end:
1592
2539
1593
2540
if(debug){
1594
fprintf(stderr, "%s exiting\n", argv[0]);
2541
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1595
2542
}
1596
2543
1597
2544
/* Cleanup things */
2545
free(mc.interfaces);
2546
1598
2547
if(sb != NULL)
1599
2548
avahi_s_service_browser_free(sb);
1600
2549
1601
2550
if(mc.server != NULL)
1602
2551
avahi_server_free(mc.server);
1603
2552
1604
if(mc.simple_poll != NULL)
1605
avahi_simple_poll_free(mc.simple_poll);
2553
if(simple_poll != NULL)
2554
avahi_simple_poll_free(simple_poll);
1606
2555
1607
2556
if(gnutls_initialized){
1608
2557
gnutls_certificate_free_credentials(mc.cred);
1614
2563
gpgme_release(mc.ctx);
1615
2564
}
1616
2565
1617
/* Take down the network interface */
1618
if(take_down_interface){
1619
/* Re-raise priviliges */
1620
errno = 0;
1621
ret = seteuid(0);
1622
if(ret == -1){
1623
perror("seteuid");
1624
}
1625
if(geteuid() == 0){
1626
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1627
if(ret == -1){
1628
perror("ioctl SIOCGIFFLAGS");
1629
} else if(network.ifr_flags & IFF_UP) {
1630
network.ifr_flags &= ~IFF_UP; /* clear flag */
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1632
if(ret == -1){
1633
perror("ioctl SIOCSIFFLAGS");
1634
}
1635
}
1636
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1637
if(ret == -1){
1638
perror("close");
1639
}
1640
/* Lower privileges permanently */
1641
errno = 0;
1642
ret = setuid(uid);
1643
if(ret == -1){
1644
perror("setuid");
1645
}
1646
}
1647
}
1648
1649
/* Removes the temp directory used by GPGME */
1650
if(tempdir_created){
1651
DIR *d;
1652
struct dirent *direntry;
1653
d = opendir(tempdir);
1654
if(d == NULL){
1655
if(errno != ENOENT){
1656
perror("opendir");
1657
}
1658
} else {
1659
while(true){
1660
direntry = readdir(d);
1661
if(direntry == NULL){
1662
break;
1663
}
1664
/* Skip "." and ".." */
1665
if(direntry->d_name[0] == '.'
1666
and (direntry->d_name[1] == '\0'
1667
or (direntry->d_name[1] == '.'
1668
and direntry->d_name[2] == '\0'))){
1669
continue;
1670
}
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror("asprintf");
1676
continue;
1677
}
1678
ret = remove(fullname);
1679
if(ret == -1){
1680
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1681
strerror(errno));
1682
}
1683
free(fullname);
1684
}
1685
closedir(d);
1686
}
1687
ret = rmdir(tempdir);
1688
if(ret == -1 and errno != ENOENT){
1689
perror("rmdir");
2566
/* Cleans up the circular linked list of Mandos servers the client
2567
has seen */
2568
if(mc.current_server != NULL){
2569
mc.current_server->prev->next = NULL;
2570
while(mc.current_server != NULL){
2571
server *next = mc.current_server->next;
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic push
2574
#pragma GCC diagnostic ignored "-Wcast-qual"
2575
#endif
2576
free((char *)(mc.current_server->ip));
2577
#ifdef __GNUC__
2578
#pragma GCC diagnostic pop
2579
#endif
2580
free(mc.current_server);
2581
mc.current_server = next;
2582
}
2583
}
2584
2585
/* Re-raise privileges */
2586
{
2587
ret_errno = raise_privileges();
2588
if(ret_errno != 0){
2589
errno = ret_errno;
2590
perror_plus("Failed to raise privileges");
2591
} else {
2592
2593
/* Run network hooks */
2594
run_network_hooks("stop", interfaces_hooks != NULL ?
2595
interfaces_hooks : "", delay);
2596
2597
/* Take down the network interfaces which were brought up */
2598
{
2599
char *interface = NULL;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to take down interface");
2607
}
2608
}
2609
if(debug and (interfaces_to_take_down == NULL)){
2610
fprintf_plus(stderr, "No interfaces needed to be taken"
2611
" down\n");
2612
}
2613
}
2614
}
2615
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
errno = ret_errno;
2619
perror_plus("Failed to lower privileges permanently");
2620
}
2621
}
2622
2623
free(interfaces_to_take_down);
2624
free(interfaces_hooks);
2625
2626
/* Removes the GPGME temp directory and all files inside */
2627
if(tempdir != NULL){
2628
struct dirent **direntries = NULL;
2629
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2630
O_NOFOLLOW));
2631
if(tempdir_fd == -1){
2632
perror_plus("open");
2633
} else {
2634
#ifdef __GLIBC__
2635
#if __GLIBC_PREREQ(2, 15)
2636
int numentries = scandirat(tempdir_fd, ".", &direntries,
2637
notdotentries, alphasort);
2638
#else /* not __GLIBC_PREREQ(2, 15) */
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2640
alphasort);
2641
#endif /* not __GLIBC_PREREQ(2, 15) */
2642
#else /* not __GLIBC__ */
2643
int numentries = scandir(tempdir, &direntries, notdotentries,
2644
alphasort);
2645
#endif /* not __GLIBC__ */
2646
if(numentries >= 0){
2647
for(int i = 0; i < numentries; i++){
2648
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2649
if(ret == -1){
2650
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2651
" \"%s\", 0): %s\n", tempdir,
2652
direntries[i]->d_name, strerror(errno));
2653
}
2654
free(direntries[i]);
2655
}
2656
2657
/* need to clean even if 0 because man page doesn't specify */
2658
free(direntries);
2659
if(numentries == -1){
2660
perror_plus("scandir");
2661
}
2662
ret = rmdir(tempdir);
2663
if(ret == -1 and errno != ENOENT){
2664
perror_plus("rmdir");
2665
}
2666
}
2667
TEMP_FAILURE_RETRY(close(tempdir_fd));
1690
2668
}
1691
2669
}
1692
2670
1697
2675
&old_sigterm_action,
1698
2676
NULL));
1699
2677
if(ret == -1){
1700
perror("sigaction");
2678
perror_plus("sigaction");
1701
2679
}
1702
2680
do {
1703
2681
ret = raise(signal_received);
1704
2682
} while(ret != 0 and errno == EINTR);
1705
2683
if(ret != 0){
1706
perror("raise");
2684
perror_plus("raise");
1707
2685
abort();
1708
2686
}
1709
2687
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0