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- Committer: Teddy Hogeborn
- Date: 2008-09-30 07:23:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20080930072339-jn15gyrtfpdk2dhx
* .bzrignore: Added "man" directory (created by "make install-html").
* Makefile: Add "common.ent" dependency to all manual pages.
(htmldir, version, SED): New variables.
(CFLAGS): Add -D option to define VERSION to $(version).
(MANPOST, HTMLPOST): Use $(SED).
(PROGS): Use $(CPROGS)
(CPROGS): New; C-only programs.
(objects): Use $(CPROGS).
(common.ent, mandos, mandos-keygen): New targets; update version
number to $(version).
(clean): Use $(CPROGS).
(check): Depend on "all".
(install-html): Install to $(htmldir).
* common.ent: New file with "version" entity.
* mandos-clients.conf.xml: Use "common.ent".
* mandos-keygen.xml: - '' -
* mandos.conf.xml: - '' -
* mandos.xml: - '' -
* plugin-runner.xml: - '' -
* plugins.d/mandos-client.xml: - '' -
* plugins.d/password-prompt.xml: - '' -
* plugin-runner.c (argp_program_version): Use VERSION.
* plugins.d/mandos-client.c (argp_program_version): - '' -
* plugins.d/password-prompt.c (argp_program_version): - '' -
* Makefile: Add "common.ent" dependency to all manual pages.
(htmldir, version, SED): New variables.
(CFLAGS): Add -D option to define VERSION to $(version).
(MANPOST, HTMLPOST): Use $(SED).
(PROGS): Use $(CPROGS)
(CPROGS): New; C-only programs.
(objects): Use $(CPROGS).
(common.ent, mandos, mandos-keygen): New targets; update version
number to $(version).
(clean): Use $(CPROGS).
(check): Depend on "all".
(install-html): Install to $(htmldir).
* common.ent: New file with "version" entity.
* mandos-clients.conf.xml: Use "common.ent".
* mandos-keygen.xml: - '' -
* mandos.conf.xml: - '' -
* mandos.xml: - '' -
* plugin-runner.xml: - '' -
* plugins.d/mandos-client.xml: - '' -
* plugins.d/password-prompt.xml: - '' -
* plugin-runner.c (argp_program_version): Use VERSION.
* plugins.d/mandos-client.c (argp_program_version): - '' -
* plugins.d/password-prompt.c (argp_program_version): - '' -
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
13
*
14
* This program is free software: you can redistribute it and/or
15
* modify it under the terms of the GNU General Public License as
16
* published by the Free Software Foundation, either version 3 of the
17
* License, or (at your option) any later version.
18
*
19
* This program is distributed in the hope that it will be useful, but
23
20
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
21
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
22
* General Public License for more details.
26
23
*
27
24
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
25
* along with this program. If not, see
26
* <http://www.gnu.org/licenses/>.
29
27
*
30
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
31
29
*/
32
30
33
31
/* Needed by GPGME, specifically gpgme_data_seek() */
34
#ifndef _LARGEFILE_SOURCE
35
32
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
37
#ifndef _FILE_OFFSET_BITS
38
33
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
40
34
41
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
36
43
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
38
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
#include <stdint.h> /* uint16_t, uint32_t */
46
40
#include <stddef.h> /* NULL, size_t, ssize_t */
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
strtof(), abort() */
49
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
53
#include <sys/ioctl.h> /* ioctl */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
54
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
48
sockaddr_in6, PF_INET6,
56
SOCK_STREAM, uid_t, gid_t, open(),
57
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
59
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
*/
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
72
program_invocation_short_name */
73
#include <time.h> /* nanosleep(), time(), sleep() */
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
74
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
62
SIOCSIFFLAGS, if_indextoname(),
76
63
if_nametoindex(), IF_NAMESIZE */
77
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
78
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
79
*/
64
#include <netinet/in.h>
80
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
85
#include <iso646.h> /* not, or, and */
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
86
70
#include <argp.h> /* struct argp_option, error_t, struct
87
71
argp_state, struct argp,
88
72
argp_parse(), ARGP_KEY_ARG,
89
73
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
90
#include <signal.h> /* sigemptyset(), sigaddset(),
91
sigaction(), SIGTERM, sig_atomic_t,
92
raise() */
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
105
#ifdef __linux__
106
#include <sys/klog.h> /* klogctl() */
107
#endif /* __linux__ */
108
74
109
75
/* Avahi */
110
76
/* All Avahi types, constants and functions
123
89
gnutls_*
124
90
init_gnutls_session(),
125
91
GNUTLS_* */
126
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
129
94
130
95
/* GPGME */
131
96
#include <gpgme.h> /* All GPGME types, constants and
139
104
#define PATHDIR "/conf/conf.d/mandos"
140
105
#define SECKEY "seckey.txt"
141
106
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
143
107
144
108
bool debug = false;
145
109
static const char mandos_protocol_version[] = "1";
146
110
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
static const char sys_class_net[] = "/sys/class/net";
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
157
const char *ip;
158
in_port_t port;
159
AvahiIfIndex if_index;
160
int af;
161
struct timespec last_seen;
162
struct server *next;
163
struct server *prev;
164
} server;
111
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
165
112
166
113
/* Used for passing in values through the Avahi callback functions */
167
114
typedef struct {
115
AvahiSimplePoll *simple_poll;
168
116
AvahiServer *server;
169
117
gnutls_certificate_credentials_t cred;
170
118
unsigned int dh_bits;
171
119
gnutls_dh_params_t dh_params;
172
120
const char *priority;
173
121
gpgme_ctx_t ctx;
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
122
} mandos_context;
178
123
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
181
182
sig_atomic_t quit_now = 0;
183
int signal_received = 0;
184
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
187
int e = errno;
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
190
errno = e;
191
perror(print_text);
192
}
193
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
203
204
124
/*
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
* bytes. "buffer_capacity" is how much is currently allocated,
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
207
127
* "buffer_length" is how much is already used.
208
128
*/
209
__attribute__((nonnull, warn_unused_result))
210
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
130
size_t buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
132
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
133
if (buffer == NULL){
219
134
return 0;
220
135
}
221
*buffer = new_buf;
222
136
buffer_capacity += BUFFER_SIZE;
223
137
}
224
138
return buffer_capacity;
225
139
}
226
140
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
231
int ret;
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
235
return false;
236
}
237
*new_server = (server){ .ip = strdup(ip),
238
.port = port,
239
.if_index = if_index,
240
.af = af };
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
259
}
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
265
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
273
}
274
275
141
/*
276
142
* Initialize GPGME.
277
143
*/
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
145
const char *pubkey, const char *tempdir){
146
int ret;
283
147
gpgme_error_t rc;
284
148
gpgme_engine_info_t engine_info;
285
149
150
286
151
/*
287
* Helper function to insert pub and seckey to the engine keyring.
152
* Helper function to insert pub and seckey to the enigne keyring.
288
153
*/
289
bool import_key(const char * const filename){
290
int ret;
154
bool import_key(const char *filename){
291
155
int fd;
292
156
gpgme_data_t pgp_data;
293
157
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
295
159
if(fd == -1){
296
perror_plus("open");
160
perror("open");
297
161
return false;
298
162
}
299
163
300
164
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
304
168
return false;
305
169
}
306
170
307
171
rc = gpgme_op_import(mc->ctx, pgp_data);
308
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
172
if (rc != GPG_ERR_NO_ERROR){
173
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
174
gpgme_strsource(rc), gpgme_strerror(rc));
311
175
return false;
312
176
}
313
177
314
ret = close(fd);
178
ret = TEMP_FAILURE_RETRY(close(fd));
315
179
if(ret == -1){
316
perror_plus("close");
180
perror("close");
317
181
}
318
182
gpgme_data_release(pgp_data);
319
183
return true;
320
184
}
321
185
322
if(debug){
323
fprintf_plus(stderr, "Initializing GPGME\n");
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
324
188
}
325
189
326
190
/* Init GPGME */
327
191
gpgme_check_version(NULL);
328
192
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
329
if(rc != GPG_ERR_NO_ERROR){
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
193
if (rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
332
196
return false;
333
197
}
334
198
335
/* Set GPGME home directory for the OpenPGP engine only */
336
rc = gpgme_get_engine_info(&engine_info);
337
if(rc != GPG_ERR_NO_ERROR){
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
199
/* Set GPGME home directory for the OpenPGP engine only */
200
rc = gpgme_get_engine_info (&engine_info);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
340
204
return false;
341
205
}
342
206
while(engine_info != NULL){
348
212
engine_info = engine_info->next;
349
213
}
350
214
if(engine_info == NULL){
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
215
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
353
216
return false;
354
217
}
355
218
356
219
/* Create new GPGME "context" */
357
220
rc = gpgme_new(&(mc->ctx));
358
if(rc != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
362
return false;
363
}
364
365
if(not import_key(pubkey) or not import_key(seckey)){
366
return false;
367
}
368
369
return true;
221
if (rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_new: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
224
return false;
225
}
226
227
if (not import_key(pubkey) or not import_key(seckey)){
228
return false;
229
}
230
231
return true;
370
232
}
371
233
372
234
/*
373
235
* Decrypt OpenPGP data.
374
236
* Returns -1 on error
375
237
*/
376
__attribute__((nonnull, warn_unused_result))
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
381
242
gpgme_data_t dh_crypto, dh_plain;
382
243
gpgme_error_t rc;
383
244
ssize_t ret;
384
245
size_t plaintext_capacity = 0;
385
246
ssize_t plaintext_length = 0;
386
247
387
if(debug){
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
248
if (debug){
249
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
389
250
}
390
251
391
252
/* Create new GPGME data buffer from memory cryptotext */
392
253
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
393
254
0);
394
if(rc != GPG_ERR_NO_ERROR){
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
255
if (rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
397
258
return -1;
398
259
}
399
260
400
261
/* Create new empty GPGME data buffer for the plaintext */
401
262
rc = gpgme_data_new(&dh_plain);
402
if(rc != GPG_ERR_NO_ERROR){
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
263
if (rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
406
266
gpgme_data_release(dh_crypto);
407
267
return -1;
408
268
}
410
270
/* Decrypt data from the cryptotext data buffer to the plaintext
411
271
data buffer */
412
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
413
if(rc != GPG_ERR_NO_ERROR){
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
273
if (rc != GPG_ERR_NO_ERROR){
274
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
416
276
plaintext_length = -1;
417
if(debug){
277
if (debug){
418
278
gpgme_decrypt_result_t result;
419
279
result = gpgme_op_decrypt_result(mc->ctx);
420
if(result == NULL){
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
280
if (result == NULL){
281
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
422
282
} else {
423
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
424
result->unsupported_algorithm);
425
fprintf_plus(stderr, "Wrong key usage: %u\n",
426
result->wrong_key_usage);
283
fprintf(stderr, "Unsupported algorithm: %s\n",
284
result->unsupported_algorithm);
285
fprintf(stderr, "Wrong key usage: %u\n",
286
result->wrong_key_usage);
427
287
if(result->file_name != NULL){
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
288
fprintf(stderr, "File name: %s\n", result->file_name);
429
289
}
430
290
gpgme_recipient_t recipient;
431
291
recipient = result->recipients;
432
while(recipient != NULL){
433
fprintf_plus(stderr, "Public key algorithm: %s\n",
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
436
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
437
fprintf_plus(stderr, "Secret key available: %s\n",
438
recipient->status == GPG_ERR_NO_SECKEY
439
? "No" : "Yes");
440
recipient = recipient->next;
292
if(recipient){
293
while(recipient != NULL){
294
fprintf(stderr, "Public key algorithm: %s\n",
295
gpgme_pubkey_algo_name(recipient->pubkey_algo));
296
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
297
fprintf(stderr, "Secret key available: %s\n",
298
recipient->status == GPG_ERR_NO_SECKEY
299
? "No" : "Yes");
300
recipient = recipient->next;
301
}
441
302
}
442
303
}
443
304
}
445
306
}
446
307
447
308
if(debug){
448
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
309
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
449
310
}
450
311
451
312
/* Seek back to the beginning of the GPGME plaintext data buffer */
452
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
453
perror_plus("gpgme_data_seek");
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
314
perror("gpgme_data_seek");
454
315
plaintext_length = -1;
455
316
goto decrypt_end;
456
317
}
457
318
458
319
*plaintext = NULL;
459
320
while(true){
460
plaintext_capacity = incbuffer(plaintext,
461
(size_t)plaintext_length,
462
plaintext_capacity);
463
if(plaintext_capacity == 0){
464
perror_plus("incbuffer");
465
plaintext_length = -1;
466
goto decrypt_end;
321
plaintext_capacity = adjustbuffer(plaintext,
322
(size_t)plaintext_length,
323
plaintext_capacity);
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
326
plaintext_length = -1;
327
goto decrypt_end;
467
328
}
468
329
469
330
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
470
331
BUFFER_SIZE);
471
332
/* Print the data, if any */
472
if(ret == 0){
333
if (ret == 0){
473
334
/* EOF */
474
335
break;
475
336
}
476
337
if(ret < 0){
477
perror_plus("gpgme_data_read");
338
perror("gpgme_data_read");
478
339
plaintext_length = -1;
479
340
goto decrypt_end;
480
341
}
482
343
}
483
344
484
345
if(debug){
485
fprintf_plus(stderr, "Decrypted password is: ");
346
fprintf(stderr, "Decrypted password is: ");
486
347
for(ssize_t i = 0; i < plaintext_length; i++){
487
348
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
488
349
}
499
360
return plaintext_length;
500
361
}
501
362
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
366
ret = "(unknown)";
367
return ret;
513
368
}
514
369
515
370
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
371
static void debuggnutls(__attribute__((unused)) int level,
518
372
const char* string){
519
fprintf_plus(stderr, "GnuTLS: %s", string);
373
fprintf(stderr, "GnuTLS: %s", string);
520
374
}
521
375
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
static int init_gnutls_global(const char *pubkeyfilename,
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
378
const char *seckeyfilename){
527
379
int ret;
528
unsigned int uret;
529
530
if(debug){
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
}
533
534
if(debug){
380
381
if(debug){
382
fprintf(stderr, "Initializing GnuTLS\n");
383
}
384
385
ret = gnutls_global_init();
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
389
return -1;
390
}
391
392
if (debug){
535
393
/* "Use a log level over 10 to enable all debugging options."
536
394
* - GnuTLS manual
537
395
*/
540
398
}
541
399
542
400
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
401
gnutls_certificate_allocate_credentials(&mc->cred);
402
if (ret != GNUTLS_E_SUCCESS){
403
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
404
warning */
405
safer_gnutls_strerror(ret));
406
gnutls_global_deinit ();
547
407
return -1;
548
408
}
549
409
550
410
if(debug){
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
553
pubkeyfilename,
554
seckeyfilename);
411
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
412
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
413
seckeyfilename);
555
414
}
556
415
557
416
ret = gnutls_certificate_set_openpgp_key_file
558
417
(mc->cred, pubkeyfilename, seckeyfilename,
559
418
GNUTLS_OPENPGP_FMT_BASE64);
560
if(ret != GNUTLS_E_SUCCESS){
561
fprintf_plus(stderr,
562
"Error[%d] while reading the OpenPGP key pair ('%s',"
563
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
565
safer_gnutls_strerror(ret));
419
if (ret != GNUTLS_E_SUCCESS) {
420
fprintf(stderr,
421
"Error[%d] while reading the OpenPGP key pair ('%s',"
422
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
423
fprintf(stderr, "The GnuTLS error is: %s\n",
424
safer_gnutls_strerror(ret));
566
425
goto globalfail;
567
426
}
568
427
569
428
/* GnuTLS server initialization */
570
429
ret = gnutls_dh_params_init(&mc->dh_params);
571
if(ret != GNUTLS_E_SUCCESS){
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
" initialization: %s\n",
574
safer_gnutls_strerror(ret));
575
goto globalfail;
576
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
close(dhpfile);
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
619
}
620
if(dhparamsfilename == NULL){
621
break;
622
}
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
630
}
631
free(params.data);
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
430
if (ret != GNUTLS_E_SUCCESS) {
431
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
432
" %s\n", safer_gnutls_strerror(ret));
433
goto globalfail;
434
}
435
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
436
if (ret != GNUTLS_E_SUCCESS) {
437
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
438
safer_gnutls_strerror(ret));
439
goto globalfail;
440
}
441
751
442
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
752
443
753
444
return 0;
755
446
globalfail:
756
447
757
448
gnutls_certificate_free_credentials(mc->cred);
449
gnutls_global_deinit();
758
450
gnutls_dh_params_deinit(mc->dh_params);
759
451
return -1;
760
452
}
761
453
762
__attribute__((nonnull, warn_unused_result))
763
static int init_gnutls_session(gnutls_session_t *session,
764
mandos_context *mc){
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
765
456
int ret;
766
457
/* GnuTLS session creation */
767
do {
768
ret = gnutls_init(session, GNUTLS_SERVER);
769
if(quit_now){
770
return -1;
771
}
772
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
773
if(ret != GNUTLS_E_SUCCESS){
774
fprintf_plus(stderr,
775
"Error in GnuTLS session initialization: %s\n",
776
safer_gnutls_strerror(ret));
458
ret = gnutls_init(session, GNUTLS_SERVER);
459
if (ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
461
safer_gnutls_strerror(ret));
777
462
}
778
463
779
464
{
780
465
const char *err;
781
do {
782
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
783
if(quit_now){
784
gnutls_deinit(*session);
785
return -1;
786
}
787
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
788
if(ret != GNUTLS_E_SUCCESS){
789
fprintf_plus(stderr, "Syntax error at: %s\n", err);
790
fprintf_plus(stderr, "GnuTLS error: %s\n",
791
safer_gnutls_strerror(ret));
792
gnutls_deinit(*session);
466
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
467
if (ret != GNUTLS_E_SUCCESS) {
468
fprintf(stderr, "Syntax error at: %s\n", err);
469
fprintf(stderr, "GnuTLS error: %s\n",
470
safer_gnutls_strerror(ret));
471
gnutls_deinit (*session);
793
472
return -1;
794
473
}
795
474
}
796
475
797
do {
798
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
799
mc->cred);
800
if(quit_now){
801
gnutls_deinit(*session);
802
return -1;
803
}
804
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
805
if(ret != GNUTLS_E_SUCCESS){
806
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
807
safer_gnutls_strerror(ret));
808
gnutls_deinit(*session);
476
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
477
mc->cred);
478
if (ret != GNUTLS_E_SUCCESS) {
479
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
480
safer_gnutls_strerror(ret));
481
gnutls_deinit (*session);
809
482
return -1;
810
483
}
811
484
812
485
/* ignore client certificate if any. */
813
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
488
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
814
490
815
491
return 0;
816
492
}
819
495
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
820
496
__attribute__((unused)) const char *txt){}
821
497
822
/* Set effective uid to 0, return errno */
823
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
826
int ret = 0;
827
if(seteuid(0) == -1){
828
ret = errno;
829
}
830
errno = old_errno;
831
return ret;
832
}
833
834
/* Set effective and real user ID to 0. Return errno. */
835
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
839
if(ret != 0){
840
errno = old_errno;
841
return ret;
842
}
843
if(setuid(0) == -1){
844
ret = errno;
845
}
846
errno = old_errno;
847
return ret;
848
}
849
850
/* Set effective user ID to unprivileged saved user ID */
851
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
854
int ret = 0;
855
if(seteuid(uid) == -1){
856
ret = errno;
857
}
858
errno = old_errno;
859
return ret;
860
}
861
862
/* Lower privileges permanently */
863
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
866
int ret = 0;
867
if(setuid(uid) == -1){
868
ret = errno;
869
}
870
errno = old_errno;
871
return ret;
872
}
873
874
/* Helper function to add_local_route() and delete_local_route() */
875
__attribute__((nonnull, warn_unused_result))
876
static bool add_delete_local_route(const bool add,
877
const char *address,
878
AvahiIfIndex if_index){
879
int ret;
880
char helper[] = "mandos-client-iprouteadddel";
881
char add_arg[] = "add";
882
char delete_arg[] = "delete";
883
char debug_flag[] = "--debug";
884
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
885
if(pluginhelperdir == NULL){
886
if(debug){
887
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
888
" variable not set; cannot run helper\n");
889
}
890
return false;
891
}
892
893
char interface[IF_NAMESIZE];
894
if(if_indextoname((unsigned int)if_index, interface) == NULL){
895
perror_plus("if_indextoname");
896
return false;
897
}
898
899
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
900
if(devnull == -1){
901
perror_plus("open(\"/dev/null\", O_RDONLY)");
902
return false;
903
}
904
pid_t pid = fork();
905
if(pid == 0){
906
/* Child */
907
/* Raise privileges */
908
errno = raise_privileges_permanently();
909
if(errno != 0){
910
perror_plus("Failed to raise privileges");
911
/* _exit(EX_NOPERM); */
912
} else {
913
/* Set group */
914
errno = 0;
915
ret = setgid(0);
916
if(ret == -1){
917
perror_plus("setgid");
918
_exit(EX_NOPERM);
919
}
920
/* Reset supplementary groups */
921
errno = 0;
922
ret = setgroups(0, NULL);
923
if(ret == -1){
924
perror_plus("setgroups");
925
_exit(EX_NOPERM);
926
}
927
}
928
ret = dup2(devnull, STDIN_FILENO);
929
if(ret == -1){
930
perror_plus("dup2(devnull, STDIN_FILENO)");
931
_exit(EX_OSERR);
932
}
933
ret = close(devnull);
934
if(ret == -1){
935
perror_plus("close");
936
_exit(EX_OSERR);
937
}
938
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
939
if(ret == -1){
940
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
941
_exit(EX_OSERR);
942
}
943
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
O_RDONLY
945
| O_DIRECTORY
946
| O_PATH
947
| O_CLOEXEC));
948
if(helperdir_fd == -1){
949
perror_plus("open");
950
_exit(EX_UNAVAILABLE);
951
}
952
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
953
helper, O_RDONLY));
954
if(helper_fd == -1){
955
perror_plus("openat");
956
close(helperdir_fd);
957
_exit(EX_UNAVAILABLE);
958
}
959
close(helperdir_fd);
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
1040
498
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
499
static int start_mandos_communication(const char *ip, uint16_t port,
1043
500
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
1045
int ret, tcp_sd = -1;
1046
ssize_t sret;
1047
struct sockaddr_storage to;
501
mandos_context *mc){
502
int ret, tcp_sd;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1048
504
char *buffer = NULL;
1049
char *decrypted_buffer = NULL;
505
char *decrypted_buffer;
1050
506
size_t buffer_length = 0;
1051
507
size_t buffer_capacity = 0;
508
ssize_t decrypted_buffer_size;
1052
509
size_t written;
1053
int retval = -1;
510
int retval = 0;
511
char interface[IF_NAMESIZE];
1054
512
gnutls_session_t session;
1055
int pf; /* Protocol family */
1056
bool route_added = false;
1057
1058
errno = 0;
1059
1060
if(quit_now){
1061
errno = EINTR;
1062
return -1;
1063
}
1064
1065
switch(af){
1066
case AF_INET6:
1067
pf = PF_INET6;
1068
break;
1069
case AF_INET:
1070
pf = PF_INET;
1071
break;
1072
default:
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
1074
errno = EINVAL;
1075
return -1;
1076
}
1077
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
513
514
ret = init_gnutls_session (mc, &session);
515
if (ret != 0){
516
return -1;
517
}
518
519
if(debug){
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
521
"\n", ip, port);
522
}
523
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
525
if(tcp_sd < 0) {
526
perror("socket");
527
return -1;
528
}
529
530
if(debug){
531
if(if_indextoname((unsigned int)if_index, interface) == NULL){
532
perror("if_indextoname");
1107
533
return -1;
1108
534
}
535
fprintf(stderr, "Binding to interface %s\n", interface);
1109
536
}
1110
537
1111
ret = init_gnutls_session(&session, mc);
1112
if(ret != 0){
538
memset(&to, 0, sizeof(to));
539
to.in6.sin6_family = AF_INET6;
540
/* It would be nice to have a way to detect if we were passed an
541
IPv4 address here. Now we assume an IPv6 address. */
542
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
543
if (ret < 0 ){
544
perror("inet_pton");
1113
545
return -1;
1114
546
}
1115
1116
if(debug){
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
1119
}
1120
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1122
if(tcp_sd < 0){
1123
int e = errno;
1124
perror_plus("socket");
1125
errno = e;
1126
goto mandos_end;
1127
}
1128
1129
if(quit_now){
1130
errno = EINTR;
1131
goto mandos_end;
1132
}
1133
1134
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
1138
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
1142
}
1143
if(ret < 0 ){
1144
int e = errno;
1145
perror_plus("inet_pton");
1146
errno = e;
1147
goto mandos_end;
1148
}
1149
547
if(ret == 0){
1150
int e = errno;
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
1152
errno = e;
1153
goto mandos_end;
1154
}
1155
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1159
if(if_index == AVAHI_IF_UNSPEC){
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
1162
errno = EINVAL;
1163
goto mandos_end;
1164
}
1165
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1167
}
1168
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
1170
}
548
fprintf(stderr, "Bad address: %s\n", ip);
549
return -1;
550
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
1171
552
1172
if(quit_now){
1173
errno = EINTR;
1174
goto mandos_end;
1175
}
553
to.in6.sin6_scope_id = (uint32_t)if_index;
1176
554
1177
555
if(debug){
1178
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1179
char interface[IF_NAMESIZE];
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
perror_plus("if_indextoname");
1182
} else {
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
1185
}
1186
} else {
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
1189
}
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
556
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
557
port);
558
char addrstr[INET6_ADDRSTRLEN] = "";
559
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
560
sizeof(addrstr)) == NULL){
561
perror("inet_ntop");
562
} else {
563
if(strcmp(addrstr, ip) != 0){
564
fprintf(stderr, "Canonical address form: %s\n", addrstr);
565
}
566
}
567
}
568
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
571
perror("connect");
572
return -1;
1272
573
}
1273
574
1274
575
const char *out = mandos_protocol_version;
1275
576
written = 0;
1276
while(true){
577
while (true){
1277
578
size_t out_size = strlen(out);
1278
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1279
out_size - written));
1280
if(ret == -1){
1281
int e = errno;
1282
perror_plus("write");
1283
errno = e;
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
out_size - written));
581
if (ret == -1){
582
perror("write");
583
retval = -1;
1284
584
goto mandos_end;
1285
585
}
1286
586
written += (size_t)ret;
1287
587
if(written < out_size){
1288
588
continue;
1289
589
} else {
1290
if(out == mandos_protocol_version){
590
if (out == mandos_protocol_version){
1291
591
written = 0;
1292
592
out = "\r\n";
1293
593
} else {
1294
594
break;
1295
595
}
1296
596
}
1297
1298
if(quit_now){
1299
errno = EINTR;
1300
goto mandos_end;
1301
}
1302
597
}
1303
598
1304
599
if(debug){
1305
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1306
}
1307
1308
if(quit_now){
1309
errno = EINTR;
1310
goto mandos_end;
1311
}
1312
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1318
1319
if(quit_now){
1320
errno = EINTR;
1321
goto mandos_end;
1322
}
1323
1324
do {
1325
ret = gnutls_handshake(session);
1326
if(quit_now){
1327
errno = EINTR;
1328
goto mandos_end;
1329
}
600
fprintf(stderr, "Establishing TLS session with %s\n", ip);
601
}
602
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
604
605
do{
606
ret = gnutls_handshake (session);
1330
607
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1331
608
1332
if(ret != GNUTLS_E_SUCCESS){
609
if (ret != GNUTLS_E_SUCCESS){
1333
610
if(debug){
1334
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
1335
gnutls_perror(ret);
611
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
612
gnutls_perror (ret);
1336
613
}
1337
errno = EPROTO;
614
retval = -1;
1338
615
goto mandos_end;
1339
616
}
1340
617
1341
618
/* Read OpenPGP packet that contains the wanted password */
1342
619
1343
620
if(debug){
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1345
" %s\n", ip);
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
622
ip);
1346
623
}
1347
624
1348
625
while(true){
1349
1350
if(quit_now){
1351
errno = EINTR;
1352
goto mandos_end;
1353
}
1354
1355
buffer_capacity = incbuffer(&buffer, buffer_length,
1356
buffer_capacity);
1357
if(buffer_capacity == 0){
1358
int e = errno;
1359
perror_plus("incbuffer");
1360
errno = e;
1361
goto mandos_end;
1362
}
1363
1364
if(quit_now){
1365
errno = EINTR;
1366
goto mandos_end;
1367
}
1368
1369
sret = gnutls_record_recv(session, buffer+buffer_length,
1370
BUFFER_SIZE);
1371
if(sret == 0){
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
627
buffer_capacity);
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
630
retval = -1;
631
goto mandos_end;
632
}
633
634
ret = gnutls_record_recv(session, buffer+buffer_length,
635
BUFFER_SIZE);
636
if (ret == 0){
1372
637
break;
1373
638
}
1374
if(sret < 0){
1375
switch(sret){
639
if (ret < 0){
640
switch(ret){
1376
641
case GNUTLS_E_INTERRUPTED:
1377
642
case GNUTLS_E_AGAIN:
1378
643
break;
1379
644
case GNUTLS_E_REHANDSHAKE:
1380
do {
1381
ret = gnutls_handshake(session);
1382
1383
if(quit_now){
1384
errno = EINTR;
1385
goto mandos_end;
1386
}
645
do{
646
ret = gnutls_handshake (session);
1387
647
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1388
if(ret < 0){
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1390
"***\n");
1391
gnutls_perror(ret);
1392
errno = EPROTO;
648
if (ret < 0){
649
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
650
gnutls_perror (ret);
651
retval = -1;
1393
652
goto mandos_end;
1394
653
}
1395
654
break;
1396
655
default:
1397
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
1399
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1400
errno = EIO;
656
fprintf(stderr, "Unknown error while reading data from"
657
" encrypted session with Mandos server\n");
658
retval = -1;
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1401
660
goto mandos_end;
1402
661
}
1403
662
} else {
1404
buffer_length += (size_t) sret;
663
buffer_length += (size_t) ret;
1405
664
}
1406
665
}
1407
666
1408
667
if(debug){
1409
fprintf_plus(stderr, "Closing TLS session\n");
1410
}
1411
1412
if(quit_now){
1413
errno = EINTR;
1414
goto mandos_end;
1415
}
1416
1417
do {
1418
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1419
if(quit_now){
1420
errno = EINTR;
1421
goto mandos_end;
1422
}
1423
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1424
1425
if(buffer_length > 0){
1426
ssize_t decrypted_buffer_size;
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
1429
if(decrypted_buffer_size >= 0){
1430
1431
clearerr(stdout);
668
fprintf(stderr, "Closing TLS session\n");
669
}
670
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
672
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
675
buffer_length,
676
&decrypted_buffer);
677
if (decrypted_buffer_size >= 0){
1432
678
written = 0;
1433
679
while(written < (size_t) decrypted_buffer_size){
1434
if(quit_now){
1435
errno = EINTR;
1436
goto mandos_end;
1437
}
1438
1439
ret = (int)fwrite(decrypted_buffer + written, 1,
1440
(size_t)decrypted_buffer_size - written,
1441
stdout);
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
1442
683
if(ret == 0 and ferror(stdout)){
1443
int e = errno;
1444
684
if(debug){
1445
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1446
strerror(errno));
685
fprintf(stderr, "Error writing encrypted data: %s\n",
686
strerror(errno));
1447
687
}
1448
errno = e;
1449
goto mandos_end;
688
retval = -1;
689
break;
1450
690
}
1451
691
written += (size_t)ret;
1452
692
}
1453
ret = fflush(stdout);
1454
if(ret != 0){
1455
int e = errno;
1456
if(debug){
1457
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1458
strerror(errno));
1459
}
1460
errno = e;
1461
goto mandos_end;
1462
}
1463
retval = 0;
693
free(decrypted_buffer);
694
} else {
695
retval = -1;
1464
696
}
697
} else {
698
retval = -1;
1465
699
}
1466
700
1467
701
/* Shutdown procedure */
1468
702
1469
703
mandos_end:
1470
{
1471
if(route_added){
1472
if(not delete_local_route(ip, if_index)){
1473
fprintf_plus(stderr, "Failed to delete local route to %s on"
1474
" interface %d", ip, if_index);
1475
}
1476
}
1477
int e = errno;
1478
free(decrypted_buffer);
1479
free(buffer);
1480
if(tcp_sd >= 0){
1481
ret = close(tcp_sd);
1482
}
1483
if(ret == -1){
1484
if(e == 0){
1485
e = errno;
1486
}
1487
perror_plus("close");
1488
}
1489
gnutls_deinit(session);
1490
errno = e;
1491
if(quit_now){
1492
errno = EINTR;
1493
retval = -1;
1494
}
704
free(buffer);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
706
if(ret == -1){
707
perror("close");
1495
708
}
709
gnutls_deinit (session);
1496
710
return retval;
1497
711
}
1498
712
1499
713
static void resolve_callback(AvahiSServiceResolver *r,
1500
714
AvahiIfIndex interface,
1501
AvahiProtocol proto,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1502
716
AvahiResolverEvent event,
1503
717
const char *name,
1504
718
const char *type,
1509
723
AVAHI_GCC_UNUSED AvahiStringList *txt,
1510
724
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1511
725
flags,
1512
void *mc){
1513
if(r == NULL){
1514
return;
1515
}
726
void* userdata) {
727
mandos_context *mc = userdata;
728
assert(r);
1516
729
1517
730
/* Called whenever a service has been resolved successfully or
1518
731
timed out */
1519
732
1520
if(quit_now){
1521
avahi_s_service_resolver_free(r);
1522
return;
1523
}
1524
1525
switch(event){
733
switch (event) {
1526
734
default:
1527
735
case AVAHI_RESOLVER_FAILURE:
1528
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1529
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1530
domain,
1531
avahi_strerror(avahi_server_errno
1532
(((mandos_context*)mc)->server)));
736
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
737
" of type '%s' in domain '%s': %s\n", name, type, domain,
738
avahi_strerror(avahi_server_errno(mc->server)));
1533
739
break;
1534
740
1535
741
case AVAHI_RESOLVER_FOUND:
1537
743
char ip[AVAHI_ADDRESS_STR_MAX];
1538
744
avahi_address_snprint(ip, sizeof(ip), address);
1539
745
if(debug){
1540
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1541
PRIdMAX ") on port %" PRIu16 "\n", name,
1542
host_name, ip, (intmax_t)interface, port);
746
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
1543
749
}
1544
int ret = start_mandos_communication(ip, (in_port_t)port,
1545
interface,
1546
avahi_proto_to_af(proto),
1547
mc);
1548
if(ret == 0){
1549
avahi_simple_poll_quit(simple_poll);
1550
} else {
1551
if(not add_server(ip, (in_port_t)port, interface,
1552
avahi_proto_to_af(proto),
1553
&((mandos_context*)mc)->current_server)){
1554
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1555
" list\n", name);
1556
}
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
1557
753
}
1558
754
}
1559
755
}
1560
756
avahi_s_service_resolver_free(r);
1561
757
}
1562
758
1563
static void browse_callback(AvahiSServiceBrowser *b,
1564
AvahiIfIndex interface,
1565
AvahiProtocol protocol,
1566
AvahiBrowserEvent event,
1567
const char *name,
1568
const char *type,
1569
const char *domain,
1570
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1571
flags,
1572
void *mc){
1573
if(b == NULL){
1574
return;
1575
}
759
static void browse_callback( AvahiSServiceBrowser *b,
760
AvahiIfIndex interface,
761
AvahiProtocol protocol,
762
AvahiBrowserEvent event,
763
const char *name,
764
const char *type,
765
const char *domain,
766
AVAHI_GCC_UNUSED AvahiLookupResultFlags
767
flags,
768
void* userdata) {
769
mandos_context *mc = userdata;
770
assert(b);
1576
771
1577
772
/* Called whenever a new services becomes available on the LAN or
1578
773
is removed from the LAN */
1579
774
1580
if(quit_now){
1581
return;
1582
}
1583
1584
switch(event){
775
switch (event) {
1585
776
default:
1586
777
case AVAHI_BROWSER_FAILURE:
1587
778
1588
fprintf_plus(stderr, "(Avahi browser) %s\n",
1589
avahi_strerror(avahi_server_errno
1590
(((mandos_context*)mc)->server)));
1591
avahi_simple_poll_quit(simple_poll);
779
fprintf(stderr, "(Avahi browser) %s\n",
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
1592
782
return;
1593
783
1594
784
case AVAHI_BROWSER_NEW:
1597
787
the callback function is called the Avahi server will free the
1598
788
resolver for us. */
1599
789
1600
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1601
interface, protocol, name, type,
1602
domain, protocol, 0,
1603
resolve_callback, mc) == NULL)
1604
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1605
" %s\n", name,
1606
avahi_strerror(avahi_server_errno
1607
(((mandos_context*)mc)->server)));
790
if (!(avahi_s_service_resolver_new(mc->server, interface,
791
protocol, name, type, domain,
792
AVAHI_PROTO_INET6, 0,
793
resolve_callback, mc)))
794
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
795
name, avahi_strerror(avahi_server_errno(mc->server)));
1608
796
break;
1609
797
1610
798
case AVAHI_BROWSER_REMOVE:
1613
801
case AVAHI_BROWSER_ALL_FOR_NOW:
1614
802
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1615
803
if(debug){
1616
fprintf_plus(stderr, "No Mandos server found, still"
1617
" searching...\n");
804
fprintf(stderr, "No Mandos server found, still searching...\n");
1618
805
}
1619
806
break;
1620
807
}
1621
808
}
1622
809
1623
/* Signal handler that stops main loop after SIGTERM */
1624
static void handle_sigterm(int sig){
1625
if(quit_now){
1626
return;
1627
}
1628
quit_now = 1;
1629
signal_received = sig;
1630
int old_errno = errno;
1631
/* set main loop to exit */
1632
if(simple_poll != NULL){
1633
avahi_simple_poll_quit(simple_poll);
1634
}
1635
errno = old_errno;
1636
}
1637
1638
__attribute__((nonnull, warn_unused_result))
1639
bool get_flags(const char *ifname, struct ifreq *ifr){
1640
int ret;
1641
int old_errno;
1642
1643
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1644
if(s < 0){
1645
old_errno = errno;
1646
perror_plus("socket");
1647
errno = old_errno;
1648
return false;
1649
}
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1652
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1653
if(ret == -1){
1654
if(debug){
1655
old_errno = errno;
1656
perror_plus("ioctl SIOCGIFFLAGS");
1657
errno = old_errno;
1658
}
1659
close(s);
1660
return false;
1661
}
1662
close(s);
1663
return true;
1664
}
1665
1666
__attribute__((nonnull, warn_unused_result))
1667
bool good_flags(const char *ifname, const struct ifreq *ifr){
1668
1669
/* Reject the loopback device */
1670
if(ifr->ifr_flags & IFF_LOOPBACK){
1671
if(debug){
1672
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1673
ifname);
1674
}
1675
return false;
1676
}
1677
/* Accept point-to-point devices only if connect_to is specified */
1678
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1679
if(debug){
1680
fprintf_plus(stderr, "Accepting point-to-point interface"
1681
" \"%s\"\n", ifname);
1682
}
1683
return true;
1684
}
1685
/* Otherwise, reject non-broadcast-capable devices */
1686
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1687
if(debug){
1688
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1689
" \"%s\"\n", ifname);
1690
}
1691
return false;
1692
}
1693
/* Reject non-ARP interfaces (including dummy interfaces) */
1694
if(ifr->ifr_flags & IFF_NOARP){
1695
if(debug){
1696
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1697
ifname);
1698
}
1699
return false;
1700
}
1701
1702
/* Accept this device */
1703
if(debug){
1704
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1705
}
1706
return true;
1707
}
1708
1709
/*
1710
* This function determines if a directory entry in /sys/class/net
1711
* corresponds to an acceptable network device.
1712
* (This function is passed to scandir(3) as a filter function.)
1713
*/
1714
__attribute__((nonnull, warn_unused_result))
1715
int good_interface(const struct dirent *if_entry){
1716
if(if_entry->d_name[0] == '.'){
1717
return 0;
1718
}
1719
1720
struct ifreq ifr;
1721
if(not get_flags(if_entry->d_name, &ifr)){
1722
if(debug){
1723
fprintf_plus(stderr, "Failed to get flags for interface "
1724
"\"%s\"\n", if_entry->d_name);
1725
}
1726
return 0;
1727
}
1728
1729
if(not good_flags(if_entry->d_name, &ifr)){
1730
return 0;
1731
}
1732
return 1;
1733
}
1734
1735
/*
1736
* This function determines if a network interface is up.
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_up(const char *interface){
1740
struct ifreq ifr;
1741
if(not get_flags(interface, &ifr)){
1742
if(debug){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1745
}
1746
return false;
1747
}
1748
1749
return (bool)(ifr.ifr_flags & IFF_UP);
1750
}
1751
1752
/*
1753
* This function determines if a network interface is running
1754
*/
1755
__attribute__((nonnull, warn_unused_result))
1756
bool interface_is_running(const char *interface){
1757
struct ifreq ifr;
1758
if(not get_flags(interface, &ifr)){
1759
if(debug){
1760
fprintf_plus(stderr, "Failed to get flags for interface "
1761
"\"%s\"\n", interface);
1762
}
1763
return false;
1764
}
1765
1766
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1767
}
1768
1769
__attribute__((nonnull, pure, warn_unused_result))
1770
int notdotentries(const struct dirent *direntry){
1771
/* Skip "." and ".." */
1772
if(direntry->d_name[0] == '.'
1773
and (direntry->d_name[1] == '\0'
1774
or (direntry->d_name[1] == '.'
1775
and direntry->d_name[2] == '\0'))){
1776
return 0;
1777
}
1778
return 1;
1779
}
1780
1781
/* Is this directory entry a runnable program? */
1782
__attribute__((nonnull, warn_unused_result))
1783
int runnable_hook(const struct dirent *direntry){
1784
int ret;
1785
size_t sret;
1786
struct stat st;
1787
1788
if((direntry->d_name)[0] == '\0'){
1789
/* Empty name? */
1790
return 0;
1791
}
1792
1793
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1794
"abcdefghijklmnopqrstuvwxyz"
1795
"0123456789"
1796
"_.-");
1797
if((direntry->d_name)[sret] != '\0'){
1798
/* Contains non-allowed characters */
1799
if(debug){
1800
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1801
direntry->d_name);
1802
}
1803
return 0;
1804
}
1805
1806
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1807
if(ret == -1){
1808
if(debug){
1809
perror_plus("Could not stat hook");
1810
}
1811
return 0;
1812
}
1813
if(not (S_ISREG(st.st_mode))){
1814
/* Not a regular file */
1815
if(debug){
1816
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1817
direntry->d_name);
1818
}
1819
return 0;
1820
}
1821
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1822
/* Not executable */
1823
if(debug){
1824
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1825
direntry->d_name);
1826
}
1827
return 0;
1828
}
1829
if(debug){
1830
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1831
direntry->d_name);
1832
}
1833
return 1;
1834
}
1835
1836
__attribute__((nonnull, warn_unused_result))
1837
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1838
mandos_context *mc){
1839
int ret;
1840
struct timespec now;
1841
struct timespec waited_time;
1842
intmax_t block_time;
1843
1844
while(true){
1845
if(mc->current_server == NULL){
1846
if(debug){
1847
fprintf_plus(stderr, "Wait until first server is found."
1848
" No timeout!\n");
1849
}
1850
ret = avahi_simple_poll_iterate(s, -1);
1851
} else {
1852
if(debug){
1853
fprintf_plus(stderr, "Check current_server if we should run"
1854
" it, or wait\n");
1855
}
1856
/* the current time */
1857
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1858
if(ret == -1){
1859
perror_plus("clock_gettime");
1860
return -1;
1861
}
1862
/* Calculating in ms how long time between now and server
1863
who we visted longest time ago. Now - last seen. */
1864
waited_time.tv_sec = (now.tv_sec
1865
- mc->current_server->last_seen.tv_sec);
1866
waited_time.tv_nsec = (now.tv_nsec
1867
- mc->current_server->last_seen.tv_nsec);
1868
/* total time is 10s/10,000ms.
1869
Converting to s from ms by dividing by 1,000,
1870
and ns to ms by dividing by 1,000,000. */
1871
block_time = ((retry_interval
1872
- ((intmax_t)waited_time.tv_sec * 1000))
1873
- ((intmax_t)waited_time.tv_nsec / 1000000));
1874
1875
if(debug){
1876
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1877
block_time);
1878
}
1879
1880
if(block_time <= 0){
1881
ret = start_mandos_communication(mc->current_server->ip,
1882
mc->current_server->port,
1883
mc->current_server->if_index,
1884
mc->current_server->af, mc);
1885
if(ret == 0){
1886
avahi_simple_poll_quit(s);
1887
return 0;
1888
}
1889
ret = clock_gettime(CLOCK_MONOTONIC,
1890
&mc->current_server->last_seen);
1891
if(ret == -1){
1892
perror_plus("clock_gettime");
1893
return -1;
1894
}
1895
mc->current_server = mc->current_server->next;
1896
block_time = 0; /* Call avahi to find new Mandos
1897
servers, but don't block */
1898
}
1899
1900
ret = avahi_simple_poll_iterate(s, (int)block_time);
1901
}
1902
if(ret != 0){
1903
if(ret > 0 or errno != EINTR){
1904
return (ret != 1) ? ret : 0;
1905
}
1906
}
1907
}
1908
}
1909
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
1912
const float delay){
1913
struct dirent **direntries = NULL;
1914
if(hookdir_fd == -1){
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1916
| O_CLOEXEC);
1917
if(hookdir_fd == -1){
1918
if(errno == ENOENT){
1919
if(debug){
1920
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1921
" found\n", hookdir);
1922
}
1923
} else {
1924
perror_plus("open");
1925
}
1926
return;
1927
}
1928
}
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1930
if(devnull == -1){
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1932
return;
1933
}
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
runnable_hook, alphasort);
1936
if(numhooks == -1){
1937
perror_plus("scandir");
1938
close(devnull);
1939
return;
1940
}
1941
struct dirent *direntry;
1942
int ret;
1943
for(int i = 0; i < numhooks; i++){
1944
direntry = direntries[i];
1945
if(debug){
1946
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1947
direntry->d_name);
1948
}
1949
pid_t hook_pid = fork();
1950
if(hook_pid == 0){
1951
/* Child */
1952
/* Raise privileges */
1953
errno = raise_privileges_permanently();
1954
if(errno != 0){
1955
perror_plus("Failed to raise privileges");
1956
_exit(EX_NOPERM);
1957
}
1958
/* Set group */
1959
errno = 0;
1960
ret = setgid(0);
1961
if(ret == -1){
1962
perror_plus("setgid");
1963
_exit(EX_NOPERM);
1964
}
1965
/* Reset supplementary groups */
1966
errno = 0;
1967
ret = setgroups(0, NULL);
1968
if(ret == -1){
1969
perror_plus("setgroups");
1970
_exit(EX_NOPERM);
1971
}
1972
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("DEVICE", interface, 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
ret = setenv("MODE", mode, 1);
1988
if(ret == -1){
1989
perror_plus("setenv");
1990
_exit(EX_OSERR);
1991
}
1992
char *delaystring;
1993
ret = asprintf(&delaystring, "%f", (double)delay);
1994
if(ret == -1){
1995
perror_plus("asprintf");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("DELAY", delaystring, 1);
1999
if(ret == -1){
2000
free(delaystring);
2001
perror_plus("setenv");
2002
_exit(EX_OSERR);
2003
}
2004
free(delaystring);
2005
if(connect_to != NULL){
2006
ret = setenv("CONNECT", connect_to, 1);
2007
if(ret == -1){
2008
perror_plus("setenv");
2009
_exit(EX_OSERR);
2010
}
2011
}
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2013
direntry->d_name,
2014
O_RDONLY));
2015
if(hook_fd == -1){
2016
perror_plus("openat");
2017
_exit(EXIT_FAILURE);
2018
}
2019
if(close(hookdir_fd) == -1){
2020
perror_plus("close");
2021
_exit(EXIT_FAILURE);
2022
}
2023
ret = dup2(devnull, STDIN_FILENO);
2024
if(ret == -1){
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
2026
_exit(EX_OSERR);
2027
}
2028
ret = close(devnull);
2029
if(ret == -1){
2030
perror_plus("close");
2031
_exit(EX_OSERR);
2032
}
2033
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2034
if(ret == -1){
2035
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2036
_exit(EX_OSERR);
2037
}
2038
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2039
environ) == -1){
2040
perror_plus("fexecve");
2041
_exit(EXIT_FAILURE);
2042
}
2043
} else {
2044
if(hook_pid == -1){
2045
perror_plus("fork");
2046
free(direntry);
2047
continue;
2048
}
2049
int status;
2050
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2051
perror_plus("waitpid");
2052
free(direntry);
2053
continue;
2054
}
2055
if(WIFEXITED(status)){
2056
if(WEXITSTATUS(status) != 0){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2058
" with status %d\n", direntry->d_name,
2059
WEXITSTATUS(status));
2060
free(direntry);
2061
continue;
2062
}
2063
} else if(WIFSIGNALED(status)){
2064
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2065
" signal %d\n", direntry->d_name,
2066
WTERMSIG(status));
2067
free(direntry);
2068
continue;
2069
} else {
2070
fprintf_plus(stderr, "Warning: network hook \"%s\""
2071
" crashed\n", direntry->d_name);
2072
free(direntry);
2073
continue;
2074
}
2075
}
2076
if(debug){
2077
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2078
direntry->d_name);
2079
}
2080
free(direntry);
2081
}
2082
free(direntries);
2083
if(close(hookdir_fd) == -1){
2084
perror_plus("close");
2085
} else {
2086
hookdir_fd = -1;
2087
}
2088
close(devnull);
2089
}
2090
2091
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
2095
int ret;
2096
struct ifreq network;
2097
unsigned int if_index = if_nametoindex(interface);
2098
if(if_index == 0){
2099
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2100
errno = old_errno;
2101
return ENXIO;
2102
}
2103
2104
if(quit_now){
2105
errno = old_errno;
2106
return EINTR;
2107
}
2108
2109
if(not interface_is_up(interface)){
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
2112
if(not get_flags(interface, &network)){
2113
ret_errno = errno;
2114
fprintf_plus(stderr, "Failed to get flags for interface "
2115
"\"%s\"\n", interface);
2116
errno = old_errno;
2117
return ret_errno;
2118
}
2119
network.ifr_flags |= IFF_UP; /* set flag */
2120
2121
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2122
if(sd == -1){
2123
ret_errno = errno;
2124
perror_plus("socket");
2125
errno = old_errno;
2126
return ret_errno;
2127
}
2128
2129
if(quit_now){
2130
ret = close(sd);
2131
if(ret == -1){
2132
perror_plus("close");
2133
}
2134
errno = old_errno;
2135
return EINTR;
2136
}
2137
2138
if(debug){
2139
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2140
interface);
2141
}
2142
2143
/* Raise privileges */
2144
ret_errno = raise_privileges();
2145
if(ret_errno != 0){
2146
errno = ret_errno;
2147
perror_plus("Failed to raise privileges");
2148
}
2149
2150
#ifdef __linux__
2151
int ret_linux;
2152
bool restore_loglevel = false;
2153
if(ret_errno == 0){
2154
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2155
messages about the network interface to mess up the prompt */
2156
ret_linux = klogctl(8, NULL, 5);
2157
if(ret_linux == -1){
2158
perror_plus("klogctl");
2159
} else {
2160
restore_loglevel = true;
2161
}
2162
}
2163
#endif /* __linux__ */
2164
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2165
ioctl_errno = errno;
2166
#ifdef __linux__
2167
if(restore_loglevel){
2168
ret_linux = klogctl(7, NULL, 0);
2169
if(ret_linux == -1){
2170
perror_plus("klogctl");
2171
}
2172
}
2173
#endif /* __linux__ */
2174
2175
/* If raise_privileges() succeeded above */
2176
if(ret_errno == 0){
2177
/* Lower privileges */
2178
ret_errno = lower_privileges();
2179
if(ret_errno != 0){
2180
errno = ret_errno;
2181
perror_plus("Failed to lower privileges");
2182
}
2183
}
2184
2185
/* Close the socket */
2186
ret = close(sd);
2187
if(ret == -1){
2188
perror_plus("close");
2189
}
2190
2191
if(ret_setflags == -1){
2192
errno = ioctl_errno;
2193
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2194
errno = old_errno;
2195
return ioctl_errno;
2196
}
2197
} else if(debug){
2198
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2199
interface);
2200
}
2201
2202
/* Sleep checking until interface is running.
2203
Check every 0.25s, up to total time of delay */
2204
for(int i = 0; i < delay * 4; i++){
2205
if(interface_is_running(interface)){
2206
break;
2207
}
2208
struct timespec sleeptime = { .tv_nsec = 250000000 };
2209
ret = nanosleep(&sleeptime, NULL);
2210
if(ret == -1 and errno != EINTR){
2211
perror_plus("nanosleep");
2212
}
2213
}
2214
2215
errno = old_errno;
2216
return 0;
2217
}
2218
2219
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
2222
struct ifreq network;
2223
unsigned int if_index = if_nametoindex(interface);
2224
if(if_index == 0){
2225
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2226
errno = old_errno;
2227
return ENXIO;
2228
}
2229
if(interface_is_up(interface)){
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
2232
if(not get_flags(interface, &network) and debug){
2233
ret_errno = errno;
2234
fprintf_plus(stderr, "Failed to get flags for interface "
2235
"\"%s\"\n", interface);
2236
errno = old_errno;
2237
return ret_errno;
2238
}
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
2241
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2242
if(sd == -1){
2243
ret_errno = errno;
2244
perror_plus("socket");
2245
errno = old_errno;
2246
return ret_errno;
2247
}
2248
2249
if(debug){
2250
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2251
interface);
2252
}
2253
2254
/* Raise privileges */
2255
ret_errno = raise_privileges();
2256
if(ret_errno != 0){
2257
errno = ret_errno;
2258
perror_plus("Failed to raise privileges");
2259
}
2260
2261
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2262
ioctl_errno = errno;
2263
2264
/* If raise_privileges() succeeded above */
2265
if(ret_errno == 0){
2266
/* Lower privileges */
2267
ret_errno = lower_privileges();
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("Failed to lower privileges");
2271
}
2272
}
2273
2274
/* Close the socket */
2275
int ret = close(sd);
2276
if(ret == -1){
2277
perror_plus("close");
2278
}
2279
2280
if(ret_setflags == -1){
2281
errno = ioctl_errno;
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
errno = old_errno;
2284
return ioctl_errno;
2285
}
2286
} else if(debug){
2287
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2288
interface);
2289
}
2290
2291
errno = old_errno;
2292
return 0;
2293
}
2294
2295
810
int main(int argc, char *argv[]){
2296
mandos_context mc = { .server = NULL, .dh_bits = 0,
2297
.priority = "SECURE256:!CTYPE-X.509"
2298
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2299
.current_server = NULL, .interfaces = NULL,
2300
.interfaces_size = 0 };
2301
AvahiSServiceBrowser *sb = NULL;
2302
error_t ret_errno;
2303
int ret;
2304
intmax_t tmpmax;
2305
char *tmp;
2306
int exitcode = EXIT_SUCCESS;
2307
char *interfaces_to_take_down = NULL;
2308
size_t interfaces_to_take_down_size = 0;
2309
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2310
char old_tempdir[] = "/tmp/mandosXXXXXX";
2311
char *tempdir = NULL;
2312
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2313
const char *seckey = PATHDIR "/" SECKEY;
2314
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2316
char *interfaces_hooks = NULL;
2317
2318
bool gnutls_initialized = false;
2319
bool gpgme_initialized = false;
2320
float delay = 2.5f;
2321
double retry_interval = 10; /* 10s between trying a server and
2322
retrying the same server again */
2323
2324
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2325
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2326
2327
uid = getuid();
2328
gid = getgid();
2329
2330
/* Lower any group privileges we might have, just to be safe */
2331
errno = 0;
2332
ret = setgid(gid);
2333
if(ret == -1){
2334
perror_plus("setgid");
2335
}
2336
2337
/* Lower user privileges (temporarily) */
2338
errno = 0;
2339
ret = seteuid(uid);
2340
if(ret == -1){
2341
perror_plus("seteuid");
2342
}
2343
2344
if(quit_now){
2345
goto end;
2346
}
2347
2348
{
2349
struct argp_option options[] = {
2350
{ .name = "debug", .key = 128,
2351
.doc = "Debug mode", .group = 3 },
2352
{ .name = "connect", .key = 'c',
2353
.arg = "ADDRESS:PORT",
2354
.doc = "Connect directly to a specific Mandos server",
2355
.group = 1 },
2356
{ .name = "interface", .key = 'i',
2357
.arg = "NAME",
2358
.doc = "Network interface that will be used to search for"
2359
" Mandos servers",
2360
.group = 1 },
2361
{ .name = "seckey", .key = 's',
2362
.arg = "FILE",
2363
.doc = "OpenPGP secret key file base name",
2364
.group = 1 },
2365
{ .name = "pubkey", .key = 'p',
2366
.arg = "FILE",
2367
.doc = "OpenPGP public key file base name",
2368
.group = 2 },
2369
{ .name = "dh-bits", .key = 129,
2370
.arg = "BITS",
2371
.doc = "Bit length of the prime number used in the"
2372
" Diffie-Hellman key exchange",
2373
.group = 2 },
2374
{ .name = "dh-params", .key = 134,
2375
.arg = "FILE",
2376
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2377
" for the Diffie-Hellman key exchange",
2378
.group = 2 },
2379
{ .name = "priority", .key = 130,
2380
.arg = "STRING",
2381
.doc = "GnuTLS priority string for the TLS handshake",
2382
.group = 1 },
2383
{ .name = "delay", .key = 131,
2384
.arg = "SECONDS",
2385
.doc = "Maximum delay to wait for interface startup",
2386
.group = 2 },
2387
{ .name = "retry", .key = 132,
2388
.arg = "SECONDS",
2389
.doc = "Retry interval used when denied by the Mandos server",
2390
.group = 2 },
2391
{ .name = "network-hook-dir", .key = 133,
2392
.arg = "DIR",
2393
.doc = "Directory where network hooks are located",
2394
.group = 2 },
2395
/*
2396
* These reproduce what we would get without ARGP_NO_HELP
2397
*/
2398
{ .name = "help", .key = '?',
2399
.doc = "Give this help list", .group = -1 },
2400
{ .name = "usage", .key = -3,
2401
.doc = "Give a short usage message", .group = -1 },
2402
{ .name = "version", .key = 'V',
2403
.doc = "Print program version", .group = -1 },
2404
{ .name = NULL }
2405
};
2406
2407
error_t parse_opt(int key, char *arg,
2408
struct argp_state *state){
811
AvahiSServiceBrowser *sb = NULL;
812
int error;
813
int ret;
814
int exitcode = EXIT_SUCCESS;
815
const char *interface = "eth0";
816
struct ifreq network;
817
int sd;
818
uid_t uid;
819
gid_t gid;
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
822
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
825
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
831
832
{
833
struct argp_option options[] = {
834
{ .name = "debug", .key = 128,
835
.doc = "Debug mode", .group = 3 },
836
{ .name = "connect", .key = 'c',
837
.arg = "ADDRESS:PORT",
838
.doc = "Connect directly to a specific Mandos server",
839
.group = 1 },
840
{ .name = "interface", .key = 'i',
841
.arg = "NAME",
842
.doc = "Interface that will be used to search for Mandos"
843
" servers",
844
.group = 1 },
845
{ .name = "seckey", .key = 's',
846
.arg = "FILE",
847
.doc = "OpenPGP secret key file base name",
848
.group = 1 },
849
{ .name = "pubkey", .key = 'p',
850
.arg = "FILE",
851
.doc = "OpenPGP public key file base name",
852
.group = 2 },
853
{ .name = "dh-bits", .key = 129,
854
.arg = "BITS",
855
.doc = "Bit length of the prime number used in the"
856
" Diffie-Hellman key exchange",
857
.group = 2 },
858
{ .name = "priority", .key = 130,
859
.arg = "STRING",
860
.doc = "GnuTLS priority string for the TLS handshake",
861
.group = 1 },
862
{ .name = NULL }
863
};
864
865
error_t parse_opt (int key, char *arg,
866
struct argp_state *state) {
867
/* Get the INPUT argument from `argp_parse', which we know is
868
a pointer to our plugin list pointer. */
869
switch (key) {
870
case 128: /* --debug */
871
debug = true;
872
break;
873
case 'c': /* --connect */
874
connect_to = arg;
875
break;
876
case 'i': /* --interface */
877
interface = arg;
878
break;
879
case 's': /* --seckey */
880
seckey = arg;
881
break;
882
case 'p': /* --pubkey */
883
pubkey = arg;
884
break;
885
case 129: /* --dh-bits */
886
errno = 0;
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
888
if (errno){
889
perror("strtol");
890
exit(EXIT_FAILURE);
891
}
892
break;
893
case 130: /* --priority */
894
mc.priority = arg;
895
break;
896
case ARGP_KEY_ARG:
897
argp_usage (state);
898
case ARGP_KEY_END:
899
break;
900
default:
901
return ARGP_ERR_UNKNOWN;
902
}
903
return 0;
904
}
905
906
struct argp argp = { .options = options, .parser = parse_opt,
907
.args_doc = "",
908
.doc = "Mandos client -- Get and decrypt"
909
" passwords from a Mandos server" };
910
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
911
if (ret == ARGP_ERR_UNKNOWN){
912
fprintf(stderr, "Unknown error while parsing arguments\n");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
918
/* If the interface is down, bring it up */
919
{
920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
921
if(sd < 0) {
922
perror("socket");
923
exitcode = EXIT_FAILURE;
924
goto end;
925
}
926
strcpy(network.ifr_name, interface);
927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
928
if(ret == -1){
929
perror("ioctl SIOCGIFFLAGS");
930
exitcode = EXIT_FAILURE;
931
goto end;
932
}
933
if((network.ifr_flags & IFF_UP) == 0){
934
network.ifr_flags |= IFF_UP;
935
ret = ioctl(sd, SIOCSIFFLAGS, &network);
936
if(ret == -1){
937
perror("ioctl SIOCSIFFLAGS");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
}
941
}
942
ret = TEMP_FAILURE_RETRY(close(sd));
943
if(ret == -1){
944
perror("close");
945
}
946
}
947
948
uid = getuid();
949
gid = getgid();
950
951
ret = setuid(uid);
952
if (ret == -1){
953
perror("setuid");
954
}
955
956
setgid(gid);
957
if (ret == -1){
958
perror("setgid");
959
}
960
961
ret = init_gnutls_global(&mc, pubkey, seckey);
962
if (ret == -1){
963
fprintf(stderr, "init_gnutls_global failed\n");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
} else {
967
gnutls_initalized = true;
968
}
969
970
if(mkdtemp(tempdir) == NULL){
971
perror("mkdtemp");
972
tempdir[0] = '\0';
973
goto end;
974
}
975
976
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
977
fprintf(stderr, "gpgme_initalized failed\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
} else {
981
gpgme_initalized = true;
982
}
983
984
if_index = (AvahiIfIndex) if_nametoindex(interface);
985
if(if_index == 0){
986
fprintf(stderr, "No such interface: \"%s\"\n", interface);
987
exit(EXIT_FAILURE);
988
}
989
990
if(connect_to != NULL){
991
/* Connect directly, do not use Zeroconf */
992
/* (Mainly meant for debugging) */
993
char *address = strrchr(connect_to, ':');
994
if(address == NULL){
995
fprintf(stderr, "No colon in address\n");
996
exitcode = EXIT_FAILURE;
997
goto end;
998
}
2409
999
errno = 0;
2410
switch(key){
2411
case 128: /* --debug */
2412
debug = true;
2413
break;
2414
case 'c': /* --connect */
2415
connect_to = arg;
2416
break;
2417
case 'i': /* --interface */
2418
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2419
arg, (int)',');
2420
if(ret_errno != 0){
2421
argp_error(state, "%s", strerror(ret_errno));
2422
}
2423
break;
2424
case 's': /* --seckey */
2425
seckey = arg;
2426
break;
2427
case 'p': /* --pubkey */
2428
pubkey = arg;
2429
break;
2430
case 129: /* --dh-bits */
2431
errno = 0;
2432
tmpmax = strtoimax(arg, &tmp, 10);
2433
if(errno != 0 or tmp == arg or *tmp != '\0'
2434
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2435
argp_error(state, "Bad number of DH bits");
2436
}
2437
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2438
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
2442
case 130: /* --priority */
2443
mc.priority = arg;
2444
break;
2445
case 131: /* --delay */
2446
errno = 0;
2447
delay = strtof(arg, &tmp);
2448
if(errno != 0 or tmp == arg or *tmp != '\0'){
2449
argp_error(state, "Bad delay");
2450
}
2451
case 132: /* --retry */
2452
errno = 0;
2453
retry_interval = strtod(arg, &tmp);
2454
if(errno != 0 or tmp == arg or *tmp != '\0'
2455
or (retry_interval * 1000) > INT_MAX
2456
or retry_interval < 0){
2457
argp_error(state, "Bad retry interval");
2458
}
2459
break;
2460
case 133: /* --network-hook-dir */
2461
hookdir = arg;
2462
break;
2463
/*
2464
* These reproduce what we would get without ARGP_NO_HELP
2465
*/
2466
case '?': /* --help */
2467
argp_state_help(state, state->out_stream,
2468
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2469
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2470
case -3: /* --usage */
2471
argp_state_help(state, state->out_stream,
2472
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2473
case 'V': /* --version */
2474
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2475
exit(argp_err_exit_status);
2476
break;
2477
default:
2478
return ARGP_ERR_UNKNOWN;
2479
}
2480
return errno;
2481
}
2482
2483
struct argp argp = { .options = options, .parser = parse_opt,
2484
.args_doc = "",
2485
.doc = "Mandos client -- Get and decrypt"
2486
" passwords from a Mandos server" };
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
switch(ret_errno){
2490
case 0:
2491
break;
2492
case ENOMEM:
2493
default:
2494
errno = ret_errno;
2495
perror_plus("argp_parse");
2496
exitcode = EX_OSERR;
2497
goto end;
2498
case EINVAL:
2499
exitcode = EX_USAGE;
2500
goto end;
2501
}
2502
}
2503
2504
{
2505
/* Work around Debian bug #633582:
2506
<https://bugs.debian.org/633582> */
2507
2508
/* Re-raise privileges */
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2512
perror_plus("Failed to raise privileges");
2513
} else {
2514
struct stat st;
2515
2516
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2517
int seckey_fd = open(seckey, O_RDONLY);
2518
if(seckey_fd == -1){
2519
perror_plus("open");
2520
} else {
2521
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2522
if(ret == -1){
2523
perror_plus("fstat");
2524
} else {
2525
if(S_ISREG(st.st_mode)
2526
and st.st_uid == 0 and st.st_gid == 0){
2527
ret = fchown(seckey_fd, uid, gid);
2528
if(ret == -1){
2529
perror_plus("fchown");
2530
}
2531
}
2532
}
2533
close(seckey_fd);
2534
}
2535
}
2536
2537
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2538
int pubkey_fd = open(pubkey, O_RDONLY);
2539
if(pubkey_fd == -1){
2540
perror_plus("open");
2541
} else {
2542
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2543
if(ret == -1){
2544
perror_plus("fstat");
2545
} else {
2546
if(S_ISREG(st.st_mode)
2547
and st.st_uid == 0 and st.st_gid == 0){
2548
ret = fchown(pubkey_fd, uid, gid);
2549
if(ret == -1){
2550
perror_plus("fchown");
2551
}
2552
}
2553
}
2554
close(pubkey_fd);
2555
}
2556
}
2557
2558
if(dh_params_file != NULL
2559
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2560
int dhparams_fd = open(dh_params_file, O_RDONLY);
2561
if(dhparams_fd == -1){
2562
perror_plus("open");
2563
} else {
2564
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2565
if(ret == -1){
2566
perror_plus("fstat");
2567
} else {
2568
if(S_ISREG(st.st_mode)
2569
and st.st_uid == 0 and st.st_gid == 0){
2570
ret = fchown(dhparams_fd, uid, gid);
2571
if(ret == -1){
2572
perror_plus("fchown");
2573
}
2574
}
2575
}
2576
close(dhparams_fd);
2577
}
2578
}
2579
2580
/* Lower privileges */
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2584
perror_plus("Failed to lower privileges");
2585
}
2586
}
2587
}
2588
2589
/* Remove invalid interface names (except "none") */
2590
{
2591
char *interface = NULL;
2592
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2593
interface))){
2594
if(strcmp(interface, "none") != 0
2595
and if_nametoindex(interface) == 0){
2596
if(interface[0] != '\0'){
2597
fprintf_plus(stderr, "Not using nonexisting interface"
2598
" \"%s\"\n", interface);
2599
}
2600
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2601
interface = NULL;
2602
}
2603
}
2604
}
2605
2606
/* Run network hooks */
2607
{
2608
if(mc.interfaces != NULL){
2609
interfaces_hooks = malloc(mc.interfaces_size);
2610
if(interfaces_hooks == NULL){
2611
perror_plus("malloc");
1000
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1001
if(errno){
1002
perror("Bad port number");
1003
exitcode = EXIT_FAILURE;
2612
1004
goto end;
2613
1005
}
2614
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2615
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2616
}
2617
run_network_hooks("start", interfaces_hooks != NULL ?
2618
interfaces_hooks : "", delay);
2619
}
2620
2621
if(not debug){
2622
avahi_set_log_function(empty_log);
2623
}
2624
2625
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2626
from the signal handler */
2627
/* Initialize the pseudo-RNG for Avahi */
2628
srand((unsigned int) time(NULL));
2629
simple_poll = avahi_simple_poll_new();
2630
if(simple_poll == NULL){
2631
fprintf_plus(stderr,
2632
"Avahi: Failed to create simple poll object.\n");
2633
exitcode = EX_UNAVAILABLE;
2634
goto end;
2635
}
2636
2637
sigemptyset(&sigterm_action.sa_mask);
2638
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2639
if(ret == -1){
2640
perror_plus("sigaddset");
2641
exitcode = EX_OSERR;
2642
goto end;
2643
}
2644
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2645
if(ret == -1){
2646
perror_plus("sigaddset");
2647
exitcode = EX_OSERR;
2648
goto end;
2649
}
2650
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2651
if(ret == -1){
2652
perror_plus("sigaddset");
2653
exitcode = EX_OSERR;
2654
goto end;
2655
}
2656
/* Need to check if the handler is SIG_IGN before handling:
2657
| [[info:libc:Initial Signal Actions]] |
2658
| [[info:libc:Basic Signal Handling]] |
2659
*/
2660
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2661
if(ret == -1){
2662
perror_plus("sigaction");
2663
return EX_OSERR;
2664
}
2665
if(old_sigterm_action.sa_handler != SIG_IGN){
2666
ret = sigaction(SIGINT, &sigterm_action, NULL);
2667
if(ret == -1){
2668
perror_plus("sigaction");
2669
exitcode = EX_OSERR;
2670
goto end;
2671
}
2672
}
2673
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2674
if(ret == -1){
2675
perror_plus("sigaction");
2676
return EX_OSERR;
2677
}
2678
if(old_sigterm_action.sa_handler != SIG_IGN){
2679
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2680
if(ret == -1){
2681
perror_plus("sigaction");
2682
exitcode = EX_OSERR;
2683
goto end;
2684
}
2685
}
2686
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2687
if(ret == -1){
2688
perror_plus("sigaction");
2689
return EX_OSERR;
2690
}
2691
if(old_sigterm_action.sa_handler != SIG_IGN){
2692
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2693
if(ret == -1){
2694
perror_plus("sigaction");
2695
exitcode = EX_OSERR;
2696
goto end;
2697
}
2698
}
2699
2700
/* If no interfaces were specified, make a list */
2701
if(mc.interfaces == NULL){
2702
struct dirent **direntries = NULL;
2703
/* Look for any good interfaces */
2704
ret = scandir(sys_class_net, &direntries, good_interface,
2705
alphasort);
2706
if(ret >= 1){
2707
/* Add all found interfaces to interfaces list */
2708
for(int i = 0; i < ret; ++i){
2709
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2710
direntries[i]->d_name);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("argz_add");
2714
free(direntries[i]);
2715
continue;
2716
}
2717
if(debug){
2718
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2719
direntries[i]->d_name);
2720
}
2721
free(direntries[i]);
2722
}
2723
free(direntries);
2724
} else {
2725
if(ret == 0){
2726
free(direntries);
2727
}
2728
fprintf_plus(stderr, "Could not find a network interface\n");
2729
exitcode = EXIT_FAILURE;
2730
goto end;
2731
}
2732
}
2733
2734
/* Bring up interfaces which are down, and remove any "none"s */
2735
{
2736
char *interface = NULL;
2737
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2738
interface))){
2739
/* If interface name is "none", stop bringing up interfaces.
2740
Also remove all instances of "none" from the list */
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
while((interface = argz_next(mc.interfaces,
2746
mc.interfaces_size, interface))){
2747
if(strcmp(interface, "none") == 0){
2748
argz_delete(&mc.interfaces, &mc.interfaces_size,
2749
interface);
2750
interface = NULL;
2751
}
2752
}
2753
break;
2754
}
2755
bool interface_was_up = interface_is_up(interface);
2756
errno = bring_up_interface(interface, delay);
2757
if(not interface_was_up){
2758
if(errno != 0){
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2761
} else {
2762
errno = argz_add(&interfaces_to_take_down,
2763
&interfaces_to_take_down_size,
2764
interface);
2765
if(errno != 0){
2766
perror_plus("argz_add");
2767
}
2768
}
2769
}
2770
}
2771
if(debug and (interfaces_to_take_down == NULL)){
2772
fprintf_plus(stderr, "No interfaces were brought up\n");
2773
}
2774
}
2775
2776
/* If we only got one interface, explicitly use only that one */
2777
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2778
if(debug){
2779
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2780
mc.interfaces);
2781
}
2782
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2783
}
2784
2785
if(quit_now){
2786
goto end;
2787
}
2788
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2790
if(ret == -1){
2791
fprintf_plus(stderr, "init_gnutls_global failed\n");
2792
exitcode = EX_UNAVAILABLE;
2793
goto end;
2794
} else {
2795
gnutls_initialized = true;
2796
}
2797
2798
if(quit_now){
2799
goto end;
2800
}
2801
2802
/* Try /run/tmp before /tmp */
2803
tempdir = mkdtemp(run_tempdir);
2804
if(tempdir == NULL and errno == ENOENT){
2805
if(debug){
2806
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2807
run_tempdir, old_tempdir);
2808
}
2809
tempdir = mkdtemp(old_tempdir);
2810
}
2811
if(tempdir == NULL){
2812
perror_plus("mkdtemp");
2813
goto end;
2814
}
2815
2816
if(quit_now){
2817
goto end;
2818
}
2819
2820
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2821
fprintf_plus(stderr, "init_gpgme failed\n");
2822
exitcode = EX_UNAVAILABLE;
2823
goto end;
2824
} else {
2825
gpgme_initialized = true;
2826
}
2827
2828
if(quit_now){
2829
goto end;
2830
}
2831
2832
if(connect_to != NULL){
2833
/* Connect directly, do not use Zeroconf */
2834
/* (Mainly meant for debugging) */
2835
char *address = strrchr(connect_to, ':');
2836
2837
if(address == NULL){
2838
fprintf_plus(stderr, "No colon in address\n");
2839
exitcode = EX_USAGE;
2840
goto end;
2841
}
2842
2843
if(quit_now){
2844
goto end;
2845
}
2846
2847
in_port_t port;
2848
errno = 0;
2849
tmpmax = strtoimax(address+1, &tmp, 10);
2850
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2851
or tmpmax != (in_port_t)tmpmax){
2852
fprintf_plus(stderr, "Bad port number\n");
2853
exitcode = EX_USAGE;
2854
goto end;
2855
}
2856
2857
if(quit_now){
2858
goto end;
2859
}
2860
2861
port = (in_port_t)tmpmax;
2862
*address = '\0';
2863
/* Colon in address indicates IPv6 */
2864
int af;
2865
if(strchr(connect_to, ':') != NULL){
2866
af = AF_INET6;
2867
/* Accept [] around IPv6 address - see RFC 5952 */
2868
if(connect_to[0] == '[' and address[-1] == ']')
2869
{
2870
connect_to++;
2871
address[-1] = '\0';
2872
}
2873
} else {
2874
af = AF_INET;
2875
}
2876
address = connect_to;
2877
2878
if(quit_now){
2879
goto end;
2880
}
2881
2882
while(not quit_now){
2883
ret = start_mandos_communication(address, port, if_index, af,
2884
&mc);
2885
if(quit_now or ret == 0){
2886
break;
2887
}
2888
if(debug){
2889
fprintf_plus(stderr, "Retrying in %d seconds\n",
2890
(int)retry_interval);
2891
}
2892
sleep((unsigned int)retry_interval);
2893
}
2894
2895
if(not quit_now){
2896
exitcode = EXIT_SUCCESS;
2897
}
2898
2899
goto end;
2900
}
2901
2902
if(quit_now){
2903
goto end;
2904
}
2905
2906
{
2907
AvahiServerConfig config;
2908
/* Do not publish any local Zeroconf records */
2909
avahi_server_config_init(&config);
2910
config.publish_hinfo = 0;
2911
config.publish_addresses = 0;
2912
config.publish_workstation = 0;
2913
config.publish_domain = 0;
2914
2915
/* Allocate a new server */
2916
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2918
2919
/* Free the Avahi configuration data */
2920
avahi_server_config_free(&config);
2921
}
2922
2923
/* Check if creating the Avahi server object succeeded */
2924
if(mc.server == NULL){
2925
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2926
avahi_strerror(ret));
2927
exitcode = EX_UNAVAILABLE;
2928
goto end;
2929
}
2930
2931
if(quit_now){
2932
goto end;
2933
}
2934
2935
/* Create the Avahi service browser */
2936
sb = avahi_s_service_browser_new(mc.server, if_index,
2937
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2938
NULL, 0, browse_callback,
2939
(void *)&mc);
2940
if(sb == NULL){
2941
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2942
avahi_strerror(avahi_server_errno(mc.server)));
2943
exitcode = EX_UNAVAILABLE;
2944
goto end;
2945
}
2946
2947
if(quit_now){
2948
goto end;
2949
}
2950
2951
/* Run the main loop */
2952
2953
if(debug){
2954
fprintf_plus(stderr, "Starting Avahi loop search\n");
2955
}
2956
2957
ret = avahi_loop_with_timeout(simple_poll,
2958
(int)(retry_interval * 1000), &mc);
2959
if(debug){
2960
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2961
(ret == 0) ? "successfully" : "with error");
2962
}
2963
1006
*address = '\0';
1007
address = connect_to;
1008
ret = start_mandos_communication(address, port, if_index, &mc);
1009
if(ret < 0){
1010
exitcode = EXIT_FAILURE;
1011
} else {
1012
exitcode = EXIT_SUCCESS;
1013
}
1014
goto end;
1015
}
1016
1017
if (not debug){
1018
avahi_set_log_function(empty_log);
1019
}
1020
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1023
1024
/* Allocate main Avahi loop object */
1025
mc.simple_poll = avahi_simple_poll_new();
1026
if (mc.simple_poll == NULL) {
1027
fprintf(stderr, "Avahi: Failed to create simple poll"
1028
" object.\n");
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
{
1034
AvahiServerConfig config;
1035
/* Do not publish any local Zeroconf records */
1036
avahi_server_config_init(&config);
1037
config.publish_hinfo = 0;
1038
config.publish_addresses = 0;
1039
config.publish_workstation = 0;
1040
config.publish_domain = 0;
1041
1042
/* Allocate a new server */
1043
mc.server = avahi_server_new(avahi_simple_poll_get
1044
(mc.simple_poll), &config, NULL,
1045
NULL, &error);
1046
1047
/* Free the Avahi configuration data */
1048
avahi_server_config_free(&config);
1049
}
1050
1051
/* Check if creating the Avahi server object succeeded */
1052
if (mc.server == NULL) {
1053
fprintf(stderr, "Failed to create Avahi server: %s\n",
1054
avahi_strerror(error));
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
1059
/* Create the Avahi service browser */
1060
sb = avahi_s_service_browser_new(mc.server, if_index,
1061
AVAHI_PROTO_INET6,
1062
"_mandos._tcp", NULL, 0,
1063
browse_callback, &mc);
1064
if (sb == NULL) {
1065
fprintf(stderr, "Failed to create service browser: %s\n",
1066
avahi_strerror(avahi_server_errno(mc.server)));
1067
exitcode = EXIT_FAILURE;
1068
goto end;
1069
}
1070
1071
/* Run the main loop */
1072
1073
if (debug){
1074
fprintf(stderr, "Starting Avahi loop search\n");
1075
}
1076
1077
avahi_simple_poll_loop(mc.simple_poll);
1078
2964
1079
end:
2965
2966
if(debug){
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2971
} else {
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2973
}
2974
}
2975
2976
/* Cleanup things */
2977
free(mc.interfaces);
2978
2979
if(sb != NULL)
2980
avahi_s_service_browser_free(sb);
2981
2982
if(mc.server != NULL)
2983
avahi_server_free(mc.server);
2984
2985
if(simple_poll != NULL)
2986
avahi_simple_poll_free(simple_poll);
2987
2988
if(gnutls_initialized){
2989
gnutls_certificate_free_credentials(mc.cred);
2990
gnutls_dh_params_deinit(mc.dh_params);
2991
}
2992
2993
if(gpgme_initialized){
2994
gpgme_release(mc.ctx);
2995
}
2996
2997
/* Cleans up the circular linked list of Mandos servers the client
2998
has seen */
2999
if(mc.current_server != NULL){
3000
mc.current_server->prev->next = NULL;
3001
while(mc.current_server != NULL){
3002
server *next = mc.current_server->next;
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic push
3005
#pragma GCC diagnostic ignored "-Wcast-qual"
3006
#endif
3007
free((char *)(mc.current_server->ip));
3008
#ifdef __GNUC__
3009
#pragma GCC diagnostic pop
3010
#endif
3011
free(mc.current_server);
3012
mc.current_server = next;
3013
}
3014
}
3015
3016
/* Re-raise privileges */
3017
{
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
3021
perror_plus("Failed to raise privileges");
3022
} else {
3023
3024
/* Run network hooks */
3025
run_network_hooks("stop", interfaces_hooks != NULL ?
3026
interfaces_hooks : "", delay);
3027
3028
/* Take down the network interfaces which were brought up */
3029
{
3030
char *interface = NULL;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3033
interface))){
3034
ret = take_down_interface(interface);
3035
if(ret != 0){
3036
errno = ret;
3037
perror_plus("Failed to take down interface");
3038
}
3039
}
3040
if(debug and (interfaces_to_take_down == NULL)){
3041
fprintf_plus(stderr, "No interfaces needed to be taken"
3042
" down\n");
3043
}
3044
}
3045
}
3046
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to lower privileges permanently");
3051
}
3052
}
3053
3054
free(interfaces_to_take_down);
3055
free(interfaces_hooks);
3056
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
3059
struct dirent **direntries = NULL;
3060
int dret;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
O_RDONLY
3063
| O_NOFOLLOW
3064
| O_DIRECTORY
3065
| O_PATH));
3066
if(dir_fd == -1){
3067
perror_plus("open");
3068
return;
3069
}
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
3073
for(int i = 0; i < numentries; i++){
3074
if(debug){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3077
}
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3079
if(dret == -1){
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3082
AT_REMOVEDIR);
3083
}
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3089
dret = 0;
3090
}
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3094
}
3095
}
3096
free(direntries[i]);
3097
}
3098
3099
/* need to clean even if 0 because man page doesn't specify */
3100
free(direntries);
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3104
}
3105
} else {
3106
perror_plus("scandirat");
3107
}
3108
close(dir_fd);
3109
}
3110
3111
/* Removes the GPGME temp directory and all files inside */
3112
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
3114
}
3115
3116
if(quit_now){
3117
sigemptyset(&old_sigterm_action.sa_mask);
3118
old_sigterm_action.sa_handler = SIG_DFL;
3119
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3120
&old_sigterm_action,
3121
NULL));
3122
if(ret == -1){
3123
perror_plus("sigaction");
3124
}
3125
do {
3126
ret = raise(signal_received);
3127
} while(ret != 0 and errno == EINTR);
3128
if(ret != 0){
3129
perror_plus("raise");
3130
abort();
3131
}
3132
TEMP_FAILURE_RETRY(pause());
3133
}
3134
3135
return exitcode;
1080
1081
if (debug){
1082
fprintf(stderr, "%s exiting\n", argv[0]);
1083
}
1084
1085
/* Cleanup things */
1086
if (sb != NULL)
1087
avahi_s_service_browser_free(sb);
1088
1089
if (mc.server != NULL)
1090
avahi_server_free(mc.server);
1091
1092
if (mc.simple_poll != NULL)
1093
avahi_simple_poll_free(mc.simple_poll);
1094
1095
if (gnutls_initalized){
1096
gnutls_certificate_free_credentials(mc.cred);
1097
gnutls_global_deinit ();
1098
gnutls_dh_params_deinit(mc.dh_params);
1099
}
1100
1101
if(gpgme_initalized){
1102
gpgme_release(mc.ctx);
1103
}
1104
1105
/* Removes the temp directory used by GPGME */
1106
if(tempdir[0] != '\0'){
1107
DIR *d;
1108
struct dirent *direntry;
1109
d = opendir(tempdir);
1110
if(d == NULL){
1111
perror("opendir");
1112
} else {
1113
while(true){
1114
direntry = readdir(d);
1115
if(direntry == NULL){
1116
break;
1117
}
1118
if (direntry->d_type == DT_REG){
1119
char *fullname = NULL;
1120
ret = asprintf(&fullname, "%s/%s", tempdir,
1121
direntry->d_name);
1122
if(ret < 0){
1123
perror("asprintf");
1124
continue;
1125
}
1126
ret = unlink(fullname);
1127
if(ret == -1){
1128
fprintf(stderr, "unlink(\"%s\"): %s",
1129
fullname, strerror(errno));
1130
}
1131
free(fullname);
1132
}
1133
}
1134
closedir(d);
1135
}
1136
ret = rmdir(tempdir);
1137
if(ret == -1){
1138
perror("rmdir");
1139
}
1140
}
1141
1142
return exitcode;
3136
1143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0