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- Committer: Teddy Hogeborn
- Date: 2014-06-22 02:19:30 UTC
- Revision ID: teddy@recompile.se-20140622021930-icl7h4cm97blhjml
mandos-keygen: Generate "checker" option to use SSH fingerprints.
To turn this off, use a new "--no-ssh" option to mandos-keygen.
* INSTALL (Mandos Server, Mandos Client): Document new suggested
installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
"mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
(mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
called "Faking ping
replies?" to address new
default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
behavior of
mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
"sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
"checker" and "ssh_fingerprint" options, unless new
"--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
(OPTIONS/--no-ssh): New.
(SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
possibility of using SSH key
fingerprints for checking.
To turn this off, use a new "--no-ssh" option to mandos-keygen.
* INSTALL (Mandos Server, Mandos Client): Document new suggested
installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
"mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
(mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
called "Faking ping
replies?" to address new
default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
behavior of
mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
"sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
"checker" and "ssh_fingerprint" options, unless new
"--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
(OPTIONS/--no-ssh): New.
(SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
possibility of using SSH key
fingerprints for checking.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
43
stdout, ferror() */
40
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
48
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
53
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
52
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
55
connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
59
#include <assert.h> /* assert() */
60
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
62
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
63
69
SIOCSIFFLAGS, if_indextoname(),
64
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if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
66
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
67
getuid(), getgid(), setuid(),
68
setgid() */
69
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
71
80
#include <argp.h> /* struct argp_option, error_t, struct
72
81
argp_state, struct argp,
73
82
argp_parse(), ARGP_KEY_ARG,
74
83
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
99
#ifdef __linux__
100
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
75
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/* Avahi */
77
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/* All Avahi types, constants and functions
90
117
gnutls_*
91
118
init_gnutls_session(),
92
119
GNUTLS_* */
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
94
GNUTLS_OPENPGP_FMT_BASE64 */
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
95
123
96
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/* GPGME */
97
125
#include <gpgme.h> /* All GPGME types, constants and
105
133
#define PATHDIR "/conf/conf.d/mandos"
106
134
#define SECKEY "seckey.txt"
107
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
108
137
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138
bool debug = false;
110
139
static const char mandos_protocol_version[] = "1";
111
140
const char *argp_program_version = "mandos-client " VERSION;
112
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
113
159
114
160
/* Used for passing in values through the Avahi callback functions */
115
161
typedef struct {
116
AvahiSimplePoll *simple_poll;
117
162
AvahiServer *server;
118
163
gnutls_certificate_credentials_t cred;
119
164
unsigned int dh_bits;
120
165
gnutls_dh_params_t dh_params;
121
166
const char *priority;
122
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
123
171
} mandos_context;
124
172
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
125
198
/*
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
128
201
* "buffer_length" is how much is already used.
129
202
*/
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
131
size_t buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
133
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
134
if (buffer == NULL){
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
135
213
return 0;
136
214
}
215
*buffer = new_buf;
137
216
buffer_capacity += BUFFER_SIZE;
138
217
}
139
218
return buffer_capacity;
140
219
}
141
220
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
/* Special case of first server */
245
if(*current_server == NULL){
246
new_server->next = new_server;
247
new_server->prev = new_server;
248
*current_server = new_server;
249
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
253
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
return true;
257
}
258
142
259
/*
143
260
* Initialize GPGME.
144
261
*/
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
146
const char *pubkey, const char *tempdir){
147
int ret;
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
148
267
gpgme_error_t rc;
149
268
gpgme_engine_info_t engine_info;
150
269
151
152
270
/*
153
* Helper function to insert pub and seckey to the enigne keyring.
271
* Helper function to insert pub and seckey to the engine keyring.
154
272
*/
155
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
274
int ret;
156
275
int fd;
157
276
gpgme_data_t pgp_data;
158
277
159
278
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
160
279
if(fd == -1){
161
perror("open");
280
perror_plus("open");
162
281
return false;
163
282
}
164
283
165
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
166
if (rc != GPG_ERR_NO_ERROR){
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
gpgme_strsource(rc), gpgme_strerror(rc));
285
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
169
288
return false;
170
289
}
171
290
172
291
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
292
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
176
295
return false;
177
296
}
178
297
179
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
180
299
if(ret == -1){
181
perror("close");
300
perror_plus("close");
182
301
}
183
302
gpgme_data_release(pgp_data);
184
303
return true;
185
304
}
186
305
187
if (debug){
188
fprintf(stderr, "Initialize gpgme\n");
306
if(debug){
307
fprintf_plus(stderr, "Initializing GPGME\n");
189
308
}
190
309
191
310
/* Init GPGME */
192
311
gpgme_check_version(NULL);
193
312
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
313
if(rc != GPG_ERR_NO_ERROR){
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
197
316
return false;
198
317
}
199
318
200
/* Set GPGME home directory for the OpenPGP engine only */
201
rc = gpgme_get_engine_info (&engine_info);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
319
/* Set GPGME home directory for the OpenPGP engine only */
320
rc = gpgme_get_engine_info(&engine_info);
321
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
205
324
return false;
206
325
}
207
326
while(engine_info != NULL){
213
332
engine_info = engine_info->next;
214
333
}
215
334
if(engine_info == NULL){
216
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
217
337
return false;
218
338
}
219
339
220
340
/* Create new GPGME "context" */
221
341
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
226
}
227
228
if (not import_key(pubkey) or not import_key(seckey)){
229
return false;
230
}
231
232
return true;
342
if(rc != GPG_ERR_NO_ERROR){
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
346
return false;
347
}
348
349
if(not import_key(pubkey) or not import_key(seckey)){
350
return false;
351
}
352
353
return true;
233
354
}
234
355
235
356
/*
236
357
* Decrypt OpenPGP data.
237
358
* Returns -1 on error
238
359
*/
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
360
__attribute__((nonnull, warn_unused_result))
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
243
365
gpgme_data_t dh_crypto, dh_plain;
244
366
gpgme_error_t rc;
245
367
ssize_t ret;
246
368
size_t plaintext_capacity = 0;
247
369
ssize_t plaintext_length = 0;
248
370
249
if (debug){
250
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
371
if(debug){
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
251
373
}
252
374
253
375
/* Create new GPGME data buffer from memory cryptotext */
254
376
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
255
377
0);
256
if (rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
259
381
return -1;
260
382
}
261
383
262
384
/* Create new empty GPGME data buffer for the plaintext */
263
385
rc = gpgme_data_new(&dh_plain);
264
if (rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
386
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
267
390
gpgme_data_release(dh_crypto);
268
391
return -1;
269
392
}
271
394
/* Decrypt data from the cryptotext data buffer to the plaintext
272
395
data buffer */
273
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
274
if (rc != GPG_ERR_NO_ERROR){
275
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
276
gpgme_strsource(rc), gpgme_strerror(rc));
397
if(rc != GPG_ERR_NO_ERROR){
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
277
400
plaintext_length = -1;
278
if (debug){
401
if(debug){
279
402
gpgme_decrypt_result_t result;
280
403
result = gpgme_op_decrypt_result(mc->ctx);
281
if (result == NULL){
282
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
404
if(result == NULL){
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
283
406
} else {
284
fprintf(stderr, "Unsupported algorithm: %s\n",
285
result->unsupported_algorithm);
286
fprintf(stderr, "Wrong key usage: %u\n",
287
result->wrong_key_usage);
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
288
411
if(result->file_name != NULL){
289
fprintf(stderr, "File name: %s\n", result->file_name);
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
290
413
}
291
414
gpgme_recipient_t recipient;
292
415
recipient = result->recipients;
293
if(recipient){
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
300
? "No" : "Yes");
301
recipient = recipient->next;
302
}
416
while(recipient != NULL){
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
424
recipient = recipient->next;
303
425
}
304
426
}
305
427
}
307
429
}
308
430
309
431
if(debug){
310
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
311
433
}
312
434
313
435
/* Seek back to the beginning of the GPGME plaintext data buffer */
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
315
perror("gpgme_data_seek");
436
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
437
perror_plus("gpgme_data_seek");
316
438
plaintext_length = -1;
317
439
goto decrypt_end;
318
440
}
319
441
320
442
*plaintext = NULL;
321
443
while(true){
322
plaintext_capacity = adjustbuffer(plaintext,
323
(size_t)plaintext_length,
324
plaintext_capacity);
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
327
plaintext_length = -1;
328
goto decrypt_end;
444
plaintext_capacity = incbuffer(plaintext,
445
(size_t)plaintext_length,
446
plaintext_capacity);
447
if(plaintext_capacity == 0){
448
perror_plus("incbuffer");
449
plaintext_length = -1;
450
goto decrypt_end;
329
451
}
330
452
331
453
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
332
454
BUFFER_SIZE);
333
455
/* Print the data, if any */
334
if (ret == 0){
456
if(ret == 0){
335
457
/* EOF */
336
458
break;
337
459
}
338
460
if(ret < 0){
339
perror("gpgme_data_read");
461
perror_plus("gpgme_data_read");
340
462
plaintext_length = -1;
341
463
goto decrypt_end;
342
464
}
344
466
}
345
467
346
468
if(debug){
347
fprintf(stderr, "Decrypted password is: ");
469
fprintf_plus(stderr, "Decrypted password is: ");
348
470
for(ssize_t i = 0; i < plaintext_length; i++){
349
471
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
350
472
}
361
483
return plaintext_length;
362
484
}
363
485
364
static const char * safer_gnutls_strerror (int value) {
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
366
if (ret == NULL)
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
489
if(ret == NULL)
367
490
ret = "(unknown)";
368
491
return ret;
369
492
}
370
493
371
494
/* GnuTLS log function callback */
495
__attribute__((nonnull))
372
496
static void debuggnutls(__attribute__((unused)) int level,
373
497
const char* string){
374
fprintf(stderr, "GnuTLS: %s", string);
498
fprintf_plus(stderr, "GnuTLS: %s", string);
375
499
}
376
500
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
379
const char *seckeyfilename){
501
__attribute__((nonnull, warn_unused_result))
502
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
380
505
int ret;
381
506
382
507
if(debug){
383
fprintf(stderr, "Initializing GnuTLS\n");
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
384
509
}
385
510
386
511
ret = gnutls_global_init();
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
390
515
return -1;
391
516
}
392
517
393
if (debug){
518
if(debug){
394
519
/* "Use a log level over 10 to enable all debugging options."
395
520
* - GnuTLS manual
396
521
*/
399
524
}
400
525
401
526
/* OpenPGP credentials */
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
408
532
return -1;
409
533
}
410
534
411
535
if(debug){
412
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
413
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
414
seckeyfilename);
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
415
540
}
416
541
417
542
ret = gnutls_certificate_set_openpgp_key_file
418
543
(mc->cred, pubkeyfilename, seckeyfilename,
419
544
GNUTLS_OPENPGP_FMT_BASE64);
420
if (ret != GNUTLS_E_SUCCESS) {
421
fprintf(stderr,
422
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
424
fprintf(stderr, "The GnuTLS error is: %s\n",
425
safer_gnutls_strerror(ret));
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr,
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
safer_gnutls_strerror(ret));
426
551
goto globalfail;
427
552
}
428
553
429
554
/* GnuTLS server initialization */
430
555
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
556
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
434
560
goto globalfail;
435
561
}
436
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
563
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
440
566
goto globalfail;
441
567
}
442
568
452
578
return -1;
453
579
}
454
580
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
457
584
int ret;
458
585
/* GnuTLS session creation */
459
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
462
safer_gnutls_strerror(ret));
586
do {
587
ret = gnutls_init(session, GNUTLS_SERVER);
588
if(quit_now){
589
return -1;
590
}
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
463
596
}
464
597
465
598
{
466
599
const char *err;
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
469
fprintf(stderr, "Syntax error at: %s\n", err);
470
fprintf(stderr, "GnuTLS error: %s\n",
471
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
600
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
if(ret != GNUTLS_E_SUCCESS){
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
611
gnutls_deinit(*session);
473
612
return -1;
474
613
}
475
614
}
476
615
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
478
mc->cred);
479
if (ret != GNUTLS_E_SUCCESS) {
480
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
481
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
616
do {
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
619
if(quit_now){
620
gnutls_deinit(*session);
621
return -1;
622
}
623
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
627
gnutls_deinit(*session);
483
628
return -1;
484
629
}
485
630
486
631
/* ignore client certificate if any. */
487
gnutls_certificate_server_set_request (*session,
488
GNUTLS_CERT_IGNORE);
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
489
633
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
491
635
492
636
return 0;
493
637
}
497
641
__attribute__((unused)) const char *txt){}
498
642
499
643
/* Called when a Mandos server is found */
500
static int start_mandos_communication(const char *ip, uint16_t port,
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
501
646
AvahiIfIndex if_index,
502
mandos_context *mc){
503
int ret, tcp_sd;
647
int af, mandos_context *mc){
648
int ret, tcp_sd = -1;
504
649
ssize_t sret;
505
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
650
struct sockaddr_storage to;
506
651
char *buffer = NULL;
507
char *decrypted_buffer;
652
char *decrypted_buffer = NULL;
508
653
size_t buffer_length = 0;
509
654
size_t buffer_capacity = 0;
510
ssize_t decrypted_buffer_size;
511
655
size_t written;
512
int retval = 0;
513
char interface[IF_NAMESIZE];
656
int retval = -1;
514
657
gnutls_session_t session;
515
516
ret = init_gnutls_session (mc, &session);
517
if (ret != 0){
518
return -1;
519
}
520
521
if(debug){
522
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
523
"\n", ip, port);
524
}
525
526
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
527
if(tcp_sd < 0) {
528
perror("socket");
529
return -1;
530
}
531
532
if(debug){
533
if(if_indextoname((unsigned int)if_index, interface) == NULL){
534
perror("if_indextoname");
658
int pf; /* Protocol family */
659
660
errno = 0;
661
662
if(quit_now){
663
errno = EINTR;
664
return -1;
665
}
666
667
switch(af){
668
case AF_INET6:
669
pf = PF_INET6;
670
break;
671
case AF_INET:
672
pf = PF_INET;
673
break;
674
default:
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
676
errno = EINVAL;
677
return -1;
678
}
679
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
535
708
return -1;
536
709
}
537
fprintf(stderr, "Binding to interface %s\n", interface);
710
}
711
712
ret = init_gnutls_session(&session, mc);
713
if(ret != 0){
714
return -1;
715
}
716
717
if(debug){
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
720
}
721
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
723
if(tcp_sd < 0){
724
int e = errno;
725
perror_plus("socket");
726
errno = e;
727
goto mandos_end;
728
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
538
733
}
539
734
540
735
memset(&to, 0, sizeof(to));
541
to.in6.sin6_family = AF_INET6;
542
/* It would be nice to have a way to detect if we were passed an
543
IPv4 address here. Now we assume an IPv6 address. */
544
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
545
if (ret < 0 ){
546
perror("inet_pton");
547
return -1;
736
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
739
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
742
}
743
if(ret < 0 ){
744
int e = errno;
745
perror_plus("inet_pton");
746
errno = e;
747
goto mandos_end;
548
748
}
549
749
if(ret == 0){
550
fprintf(stderr, "Bad address: %s\n", ip);
551
return -1;
552
}
553
to.in6.sin6_port = htons(port); /* Spurious warning */
750
int e = errno;
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
752
errno = e;
753
goto mandos_end;
754
}
755
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
759
if(if_index == AVAHI_IF_UNSPEC){
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
762
errno = EINVAL;
763
goto mandos_end;
764
}
765
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
767
}
768
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
770
}
554
771
555
to.in6.sin6_scope_id = (uint32_t)if_index;
772
if(quit_now){
773
errno = EINTR;
774
goto mandos_end;
775
}
556
776
557
777
if(debug){
558
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
559
port);
560
char addrstr[INET6_ADDRSTRLEN] = "";
561
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
562
sizeof(addrstr)) == NULL){
563
perror("inet_ntop");
564
} else {
565
if(strcmp(addrstr, ip) != 0){
566
fprintf(stderr, "Canonical address form: %s\n", addrstr);
778
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
779
char interface[IF_NAMESIZE];
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
perror_plus("if_indextoname");
782
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
567
785
}
568
}
569
}
570
571
ret = connect(tcp_sd, &to.in, sizeof(to));
572
if (ret < 0){
573
perror("connect");
574
return -1;
786
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
789
}
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
792
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
797
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
802
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
809
}
810
}
811
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
816
817
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
820
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
823
}
824
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
830
goto mandos_end;
831
}
832
833
if(quit_now){
834
errno = EINTR;
835
goto mandos_end;
575
836
}
576
837
577
838
const char *out = mandos_protocol_version;
578
839
written = 0;
579
while (true){
840
while(true){
580
841
size_t out_size = strlen(out);
581
842
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
582
out_size - written));
583
if (ret == -1){
584
perror("write");
585
retval = -1;
843
out_size - written));
844
if(ret == -1){
845
int e = errno;
846
perror_plus("write");
847
errno = e;
586
848
goto mandos_end;
587
849
}
588
850
written += (size_t)ret;
589
851
if(written < out_size){
590
852
continue;
591
853
} else {
592
if (out == mandos_protocol_version){
854
if(out == mandos_protocol_version){
593
855
written = 0;
594
856
out = "\r\n";
595
857
} else {
596
858
break;
597
859
}
598
860
}
861
862
if(quit_now){
863
errno = EINTR;
864
goto mandos_end;
865
}
599
866
}
600
867
601
868
if(debug){
602
fprintf(stderr, "Establishing TLS session with %s\n", ip);
603
}
604
605
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
606
607
do{
608
ret = gnutls_handshake (session);
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
870
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
882
883
if(quit_now){
884
errno = EINTR;
885
goto mandos_end;
886
}
887
888
do {
889
ret = gnutls_handshake(session);
890
if(quit_now){
891
errno = EINTR;
892
goto mandos_end;
893
}
609
894
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
610
895
611
if (ret != GNUTLS_E_SUCCESS){
896
if(ret != GNUTLS_E_SUCCESS){
612
897
if(debug){
613
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
614
gnutls_perror (ret);
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
899
gnutls_perror(ret);
615
900
}
616
retval = -1;
901
errno = EPROTO;
617
902
goto mandos_end;
618
903
}
619
904
620
905
/* Read OpenPGP packet that contains the wanted password */
621
906
622
907
if(debug){
623
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
624
ip);
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
625
910
}
626
911
627
912
while(true){
628
buffer_capacity = adjustbuffer(&buffer, buffer_length,
629
buffer_capacity);
630
if (buffer_capacity == 0){
631
perror("adjustbuffer");
632
retval = -1;
913
914
if(quit_now){
915
errno = EINTR;
916
goto mandos_end;
917
}
918
919
buffer_capacity = incbuffer(&buffer, buffer_length,
920
buffer_capacity);
921
if(buffer_capacity == 0){
922
int e = errno;
923
perror_plus("incbuffer");
924
errno = e;
925
goto mandos_end;
926
}
927
928
if(quit_now){
929
errno = EINTR;
633
930
goto mandos_end;
634
931
}
635
932
636
933
sret = gnutls_record_recv(session, buffer+buffer_length,
637
934
BUFFER_SIZE);
638
if (sret == 0){
935
if(sret == 0){
639
936
break;
640
937
}
641
if (sret < 0){
938
if(sret < 0){
642
939
switch(sret){
643
940
case GNUTLS_E_INTERRUPTED:
644
941
case GNUTLS_E_AGAIN:
645
942
break;
646
943
case GNUTLS_E_REHANDSHAKE:
647
do{
648
ret = gnutls_handshake (session);
944
do {
945
ret = gnutls_handshake(session);
946
947
if(quit_now){
948
errno = EINTR;
949
goto mandos_end;
950
}
649
951
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
650
if (ret < 0){
651
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
652
gnutls_perror (ret);
653
retval = -1;
952
if(ret < 0){
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
955
gnutls_perror(ret);
956
errno = EPROTO;
654
957
goto mandos_end;
655
958
}
656
959
break;
657
960
default:
658
fprintf(stderr, "Unknown error while reading data from"
659
" encrypted session with Mandos server\n");
660
retval = -1;
661
gnutls_bye (session, GNUTLS_SHUT_RDWR);
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
963
gnutls_bye(session, GNUTLS_SHUT_RDWR);
964
errno = EIO;
662
965
goto mandos_end;
663
966
}
664
967
} else {
667
970
}
668
971
669
972
if(debug){
670
fprintf(stderr, "Closing TLS session\n");
671
}
672
673
gnutls_bye (session, GNUTLS_SHUT_RDWR);
674
675
if (buffer_length > 0){
676
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
677
buffer_length,
678
&decrypted_buffer);
679
if (decrypted_buffer_size >= 0){
973
fprintf_plus(stderr, "Closing TLS session\n");
974
}
975
976
if(quit_now){
977
errno = EINTR;
978
goto mandos_end;
979
}
980
981
do {
982
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
983
if(quit_now){
984
errno = EINTR;
985
goto mandos_end;
986
}
987
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
988
989
if(buffer_length > 0){
990
ssize_t decrypted_buffer_size;
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
993
if(decrypted_buffer_size >= 0){
994
680
995
written = 0;
681
996
while(written < (size_t) decrypted_buffer_size){
682
ret = (int)fwrite (decrypted_buffer + written, 1,
683
(size_t)decrypted_buffer_size - written,
684
stdout);
997
if(quit_now){
998
errno = EINTR;
999
goto mandos_end;
1000
}
1001
1002
ret = (int)fwrite(decrypted_buffer + written, 1,
1003
(size_t)decrypted_buffer_size - written,
1004
stdout);
685
1005
if(ret == 0 and ferror(stdout)){
1006
int e = errno;
686
1007
if(debug){
687
fprintf(stderr, "Error writing encrypted data: %s\n",
688
strerror(errno));
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
689
1010
}
690
retval = -1;
691
break;
1011
errno = e;
1012
goto mandos_end;
692
1013
}
693
1014
written += (size_t)ret;
694
1015
}
695
free(decrypted_buffer);
696
} else {
697
retval = -1;
1016
retval = 0;
698
1017
}
699
} else {
700
retval = -1;
701
1018
}
702
1019
703
1020
/* Shutdown procedure */
704
1021
705
1022
mandos_end:
706
free(buffer);
707
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
708
if(ret == -1){
709
perror("close");
1023
{
1024
int e = errno;
1025
free(decrypted_buffer);
1026
free(buffer);
1027
if(tcp_sd >= 0){
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1029
}
1030
if(ret == -1){
1031
if(e == 0){
1032
e = errno;
1033
}
1034
perror_plus("close");
1035
}
1036
gnutls_deinit(session);
1037
errno = e;
1038
if(quit_now){
1039
errno = EINTR;
1040
retval = -1;
1041
}
710
1042
}
711
gnutls_deinit (session);
712
1043
return retval;
713
1044
}
714
1045
1046
__attribute__((nonnull))
715
1047
static void resolve_callback(AvahiSServiceResolver *r,
716
1048
AvahiIfIndex interface,
717
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1049
AvahiProtocol proto,
718
1050
AvahiResolverEvent event,
719
1051
const char *name,
720
1052
const char *type,
725
1057
AVAHI_GCC_UNUSED AvahiStringList *txt,
726
1058
AVAHI_GCC_UNUSED AvahiLookupResultFlags
727
1059
flags,
728
void* userdata) {
729
mandos_context *mc = userdata;
730
assert(r);
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
731
1064
732
1065
/* Called whenever a service has been resolved successfully or
733
1066
timed out */
734
1067
735
switch (event) {
1068
if(quit_now){
1069
return;
1070
}
1071
1072
switch(event){
736
1073
default:
737
1074
case AVAHI_RESOLVER_FAILURE:
738
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
739
" of type '%s' in domain '%s': %s\n", name, type, domain,
740
avahi_strerror(avahi_server_errno(mc->server)));
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
741
1080
break;
742
1081
743
1082
case AVAHI_RESOLVER_FOUND:
745
1084
char ip[AVAHI_ADDRESS_STR_MAX];
746
1085
avahi_address_snprint(ip, sizeof(ip), address);
747
1086
if(debug){
748
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
749
PRIu16 ") on port %d\n", name, host_name, ip,
750
interface, port);
1087
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
host_name, ip, (intmax_t)interface, port);
751
1090
}
752
int ret = start_mandos_communication(ip, port, interface, mc);
753
if (ret == 0){
754
avahi_simple_poll_quit(mc->simple_poll);
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1095
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1097
} else {
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
755
1104
}
756
1105
}
757
1106
}
758
1107
avahi_s_service_resolver_free(r);
759
1108
}
760
1109
761
static void browse_callback( AvahiSServiceBrowser *b,
762
AvahiIfIndex interface,
763
AvahiProtocol protocol,
764
AvahiBrowserEvent event,
765
const char *name,
766
const char *type,
767
const char *domain,
768
AVAHI_GCC_UNUSED AvahiLookupResultFlags
769
flags,
770
void* userdata) {
771
mandos_context *mc = userdata;
772
assert(b);
1110
static void browse_callback(AvahiSServiceBrowser *b,
1111
AvahiIfIndex interface,
1112
AvahiProtocol protocol,
1113
AvahiBrowserEvent event,
1114
const char *name,
1115
const char *type,
1116
const char *domain,
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
773
1123
774
1124
/* Called whenever a new services becomes available on the LAN or
775
1125
is removed from the LAN */
776
1126
777
switch (event) {
1127
if(quit_now){
1128
return;
1129
}
1130
1131
switch(event){
778
1132
default:
779
1133
case AVAHI_BROWSER_FAILURE:
780
1134
781
fprintf(stderr, "(Avahi browser) %s\n",
782
avahi_strerror(avahi_server_errno(mc->server)));
783
avahi_simple_poll_quit(mc->simple_poll);
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
784
1139
return;
785
1140
786
1141
case AVAHI_BROWSER_NEW:
789
1144
the callback function is called the Avahi server will free the
790
1145
resolver for us. */
791
1146
792
if (!(avahi_s_service_resolver_new(mc->server, interface,
793
protocol, name, type, domain,
794
AVAHI_PROTO_INET6, 0,
795
resolve_callback, mc)))
796
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
797
name, avahi_strerror(avahi_server_errno(mc->server)));
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
798
1155
break;
799
1156
800
1157
case AVAHI_BROWSER_REMOVE:
803
1160
case AVAHI_BROWSER_ALL_FOR_NOW:
804
1161
case AVAHI_BROWSER_CACHE_EXHAUSTED:
805
1162
if(debug){
806
fprintf(stderr, "No Mandos server found, still searching...\n");
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
807
1165
}
808
1166
break;
809
1167
}
810
1168
}
811
1169
1170
/* Signal handler that stops main loop after SIGTERM */
1171
static void handle_sigterm(int sig){
1172
if(quit_now){
1173
return;
1174
}
1175
quit_now = 1;
1176
signal_received = sig;
1177
int old_errno = errno;
1178
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1181
}
1182
errno = old_errno;
1183
}
1184
1185
__attribute__((nonnull, warn_unused_result))
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
int ret;
1188
error_t ret_errno;
1189
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
if(s < 0){
1192
ret_errno = errno;
1193
perror_plus("socket");
1194
errno = ret_errno;
1195
return false;
1196
}
1197
strcpy(ifr->ifr_name, ifname);
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
if(ret == -1){
1200
if(debug){
1201
ret_errno = errno;
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1204
}
1205
return false;
1206
}
1207
return true;
1208
}
1209
1210
__attribute__((nonnull, warn_unused_result))
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1213
/* Reject the loopback device */
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
if(debug){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1218
}
1219
return false;
1220
}
1221
/* Accept point-to-point devices only if connect_to is specified */
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
if(debug){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1226
}
1227
return true;
1228
}
1229
/* Otherwise, reject non-broadcast-capable devices */
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1234
}
1235
return false;
1236
}
1237
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
if(ifr->ifr_flags & IFF_NOARP){
1239
if(debug){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1242
}
1243
return false;
1244
}
1245
1246
/* Accept this device */
1247
if(debug){
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1249
}
1250
return true;
1251
}
1252
1253
/*
1254
* This function determines if a directory entry in /sys/class/net
1255
* corresponds to an acceptable network device.
1256
* (This function is passed to scandir(3) as a filter function.)
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
int good_interface(const struct dirent *if_entry){
1260
if(if_entry->d_name[0] == '.'){
1261
return 0;
1262
}
1263
1264
struct ifreq ifr;
1265
if(not get_flags(if_entry->d_name, &ifr)){
1266
if(debug){
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1269
}
1270
return 0;
1271
}
1272
1273
if(not good_flags(if_entry->d_name, &ifr)){
1274
return 0;
1275
}
1276
return 1;
1277
}
1278
1279
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1314
int notdotentries(const struct dirent *direntry){
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1320
return 0;
1321
}
1322
return 1;
1323
}
1324
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
int runnable_hook(const struct dirent *direntry){
1328
int ret;
1329
size_t sret;
1330
struct stat st;
1331
1332
if((direntry->d_name)[0] == '\0'){
1333
/* Empty name? */
1334
return 0;
1335
}
1336
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
"abcdefghijklmnopqrstuvwxyz"
1339
"0123456789"
1340
"_.-");
1341
if((direntry->d_name)[sret] != '\0'){
1342
/* Contains non-allowed characters */
1343
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1345
direntry->d_name);
1346
}
1347
return 0;
1348
}
1349
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1351
if(ret == -1){
1352
if(debug){
1353
perror_plus("Could not stat hook");
1354
}
1355
return 0;
1356
}
1357
if(not (S_ISREG(st.st_mode))){
1358
/* Not a regular file */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1362
}
1363
return 0;
1364
}
1365
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1366
/* Not executable */
1367
if(debug){
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1370
}
1371
return 0;
1372
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1377
return 1;
1378
}
1379
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1383
int ret;
1384
struct timespec now;
1385
struct timespec waited_time;
1386
intmax_t block_time;
1387
1388
while(true){
1389
if(mc->current_server == NULL){
1390
if(debug){
1391
fprintf_plus(stderr, "Wait until first server is found."
1392
" No timeout!\n");
1393
}
1394
ret = avahi_simple_poll_iterate(s, -1);
1395
} else {
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1399
}
1400
/* the current time */
1401
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1402
if(ret == -1){
1403
perror_plus("clock_gettime");
1404
return -1;
1405
}
1406
/* Calculating in ms how long time between now and server
1407
who we visted longest time ago. Now - last seen. */
1408
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1410
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1412
/* total time is 10s/10,000ms.
1413
Converting to s from ms by dividing by 1,000,
1414
and ns to ms by dividing by 1,000,000. */
1415
block_time = ((retry_interval
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1422
}
1423
1424
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1429
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1431
return 0;
1432
}
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1435
if(ret == -1){
1436
perror_plus("clock_gettime");
1437
return -1;
1438
}
1439
mc->current_server = mc->current_server->next;
1440
block_time = 0; /* Call avahi to find new Mandos
1441
servers, but don't block */
1442
}
1443
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
}
1446
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1448
return (ret != 1) ? ret : 0;
1449
}
1450
}
1451
}
1452
}
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
1506
__attribute__((nonnull))
1507
void run_network_hooks(const char *mode, const char *interface,
1508
const float delay){
1509
struct dirent **direntries = NULL;
1510
if(hookdir_fd == -1){
1511
hookdir_fd = open(hookdir, O_RDONLY);
1512
if(hookdir_fd == -1){
1513
if(errno == ENOENT){
1514
if(debug){
1515
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1516
" found\n", hookdir);
1517
}
1518
} else {
1519
perror_plus("open");
1520
}
1521
return;
1522
}
1523
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
1536
if(numhooks == -1){
1537
perror_plus("scandir");
1538
return;
1539
}
1540
struct dirent *direntry;
1541
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
1543
for(int i = 0; i < numhooks; i++){
1544
direntry = direntries[i];
1545
if(debug){
1546
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1547
direntry->d_name);
1548
}
1549
pid_t hook_pid = fork();
1550
if(hook_pid == 0){
1551
/* Child */
1552
/* Raise privileges */
1553
errno = raise_privileges_permanently();
1554
if(errno != 0){
1555
perror_plus("Failed to raise privileges");
1556
_exit(EX_NOPERM);
1557
}
1558
/* Set group */
1559
errno = 0;
1560
ret = setgid(0);
1561
if(ret == -1){
1562
perror_plus("setgid");
1563
_exit(EX_NOPERM);
1564
}
1565
/* Reset supplementary groups */
1566
errno = 0;
1567
ret = setgroups(0, NULL);
1568
if(ret == -1){
1569
perror_plus("setgroups");
1570
_exit(EX_NOPERM);
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1588
if(ret == -1){
1589
perror_plus("setenv");
1590
_exit(EX_OSERR);
1591
}
1592
ret = setenv("DEVICE", interface, 1);
1593
if(ret == -1){
1594
perror_plus("setenv");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("MODE", mode, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
char *delaystring;
1608
ret = asprintf(&delaystring, "%f", (double)delay);
1609
if(ret == -1){
1610
perror_plus("asprintf");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("DELAY", delaystring, 1);
1614
if(ret == -1){
1615
free(delaystring);
1616
perror_plus("setenv");
1617
_exit(EX_OSERR);
1618
}
1619
free(delaystring);
1620
if(connect_to != NULL){
1621
ret = setenv("CONNECT", connect_to, 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
_exit(EX_OSERR);
1625
}
1626
}
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1628
if(hook_fd == -1){
1629
perror_plus("openat");
1630
_exit(EXIT_FAILURE);
1631
}
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1633
perror_plus("close");
1634
_exit(EXIT_FAILURE);
1635
}
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1637
environ) == -1){
1638
perror_plus("fexecve");
1639
_exit(EXIT_FAILURE);
1640
}
1641
} else {
1642
int status;
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1644
perror_plus("waitpid");
1645
continue;
1646
}
1647
if(WIFEXITED(status)){
1648
if(WEXITSTATUS(status) != 0){
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1650
" with status %d\n", direntry->d_name,
1651
WEXITSTATUS(status));
1652
continue;
1653
}
1654
} else if(WIFSIGNALED(status)){
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1656
" signal %d\n", direntry->d_name,
1657
WTERMSIG(status));
1658
continue;
1659
} else {
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
1661
" crashed\n", direntry->d_name);
1662
continue;
1663
}
1664
}
1665
if(debug){
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1667
direntry->d_name);
1668
}
1669
}
1670
free(direntries);
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1672
perror_plus("close");
1673
} else {
1674
hookdir_fd = -1;
1675
}
1676
close(devnull);
1677
}
1678
1679
__attribute__((nonnull, warn_unused_result))
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
1683
int ret;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
1692
if(quit_now){
1693
errno = old_errno;
1694
return EINTR;
1695
}
1696
1697
if(not interface_is_up(interface)){
1698
error_t ret_errno = 0, ioctl_errno = 0;
1699
if(not get_flags(interface, &network)){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
errno = old_errno;
1704
return ret_errno;
1705
}
1706
network.ifr_flags |= IFF_UP; /* set flag */
1707
1708
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1709
if(sd == -1){
1710
ret_errno = errno;
1711
perror_plus("socket");
1712
errno = old_errno;
1713
return ret_errno;
1714
}
1715
1716
if(quit_now){
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1718
if(ret == -1){
1719
perror_plus("close");
1720
}
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(debug){
1726
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1727
interface);
1728
}
1729
1730
/* Raise privileges */
1731
ret_errno = raise_privileges();
1732
if(ret_errno != 0){
1733
errno = ret_errno;
1734
perror_plus("Failed to raise privileges");
1735
}
1736
1737
#ifdef __linux__
1738
int ret_linux;
1739
bool restore_loglevel = false;
1740
if(ret_errno == 0){
1741
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1742
messages about the network interface to mess up the prompt */
1743
ret_linux = klogctl(8, NULL, 5);
1744
if(ret_linux == -1){
1745
perror_plus("klogctl");
1746
} else {
1747
restore_loglevel = true;
1748
}
1749
}
1750
#endif /* __linux__ */
1751
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1752
ioctl_errno = errno;
1753
#ifdef __linux__
1754
if(restore_loglevel){
1755
ret_linux = klogctl(7, NULL, 0);
1756
if(ret_linux == -1){
1757
perror_plus("klogctl");
1758
}
1759
}
1760
#endif /* __linux__ */
1761
1762
/* If raise_privileges() succeeded above */
1763
if(ret_errno == 0){
1764
/* Lower privileges */
1765
ret_errno = lower_privileges();
1766
if(ret_errno != 0){
1767
errno = ret_errno;
1768
perror_plus("Failed to lower privileges");
1769
}
1770
}
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ioctl_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1781
errno = old_errno;
1782
return ioctl_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1786
interface);
1787
}
1788
1789
/* Sleep checking until interface is running.
1790
Check every 0.25s, up to total time of delay */
1791
for(int i=0; i < delay * 4; i++){
1792
if(interface_is_running(interface)){
1793
break;
1794
}
1795
struct timespec sleeptime = { .tv_nsec = 250000000 };
1796
ret = nanosleep(&sleeptime, NULL);
1797
if(ret == -1 and errno != EINTR){
1798
perror_plus("nanosleep");
1799
}
1800
}
1801
1802
errno = old_errno;
1803
return 0;
1804
}
1805
1806
__attribute__((nonnull, warn_unused_result))
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
1809
struct ifreq network;
1810
unsigned int if_index = if_nametoindex(interface);
1811
if(if_index == 0){
1812
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1813
errno = old_errno;
1814
return ENXIO;
1815
}
1816
if(interface_is_up(interface)){
1817
error_t ret_errno = 0, ioctl_errno = 0;
1818
if(not get_flags(interface, &network) and debug){
1819
ret_errno = errno;
1820
fprintf_plus(stderr, "Failed to get flags for interface "
1821
"\"%s\"\n", interface);
1822
errno = old_errno;
1823
return ret_errno;
1824
}
1825
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1826
1827
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1828
if(sd == -1){
1829
ret_errno = errno;
1830
perror_plus("socket");
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
1835
if(debug){
1836
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1837
interface);
1838
}
1839
1840
/* Raise privileges */
1841
ret_errno = raise_privileges();
1842
if(ret_errno != 0){
1843
errno = ret_errno;
1844
perror_plus("Failed to raise privileges");
1845
}
1846
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1849
1850
/* If raise_privileges() succeeded above */
1851
if(ret_errno == 0){
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1854
if(ret_errno != 0){
1855
errno = ret_errno;
1856
perror_plus("Failed to lower privileges");
1857
}
1858
}
1859
1860
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1862
if(ret == -1){
1863
perror_plus("close");
1864
}
1865
1866
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1868
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1869
errno = old_errno;
1870
return ioctl_errno;
1871
}
1872
} else if(debug){
1873
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1874
interface);
1875
}
1876
1877
errno = old_errno;
1878
return 0;
1879
}
1880
812
1881
int main(int argc, char *argv[]){
813
AvahiSServiceBrowser *sb = NULL;
814
int error;
815
int ret;
816
int exitcode = EXIT_SUCCESS;
817
const char *interface = "eth0";
818
struct ifreq network;
819
int sd;
820
uid_t uid;
821
gid_t gid;
822
char *connect_to = NULL;
823
char tempdir[] = "/tmp/mandosXXXXXX";
824
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
825
const char *seckey = PATHDIR "/" SECKEY;
826
const char *pubkey = PATHDIR "/" PUBKEY;
827
828
mandos_context mc = { .simple_poll = NULL, .server = NULL,
829
.dh_bits = 1024, .priority = "SECURE256"
830
":!CTYPE-X.509:+CTYPE-OPENPGP" };
831
bool gnutls_initalized = false;
832
bool gpgme_initalized = false;
833
834
{
835
struct argp_option options[] = {
836
{ .name = "debug", .key = 128,
837
.doc = "Debug mode", .group = 3 },
838
{ .name = "connect", .key = 'c',
839
.arg = "ADDRESS:PORT",
840
.doc = "Connect directly to a specific Mandos server",
841
.group = 1 },
842
{ .name = "interface", .key = 'i',
843
.arg = "NAME",
844
.doc = "Interface that will be used to search for Mandos"
845
" servers",
846
.group = 1 },
847
{ .name = "seckey", .key = 's',
848
.arg = "FILE",
849
.doc = "OpenPGP secret key file base name",
850
.group = 1 },
851
{ .name = "pubkey", .key = 'p',
852
.arg = "FILE",
853
.doc = "OpenPGP public key file base name",
854
.group = 2 },
855
{ .name = "dh-bits", .key = 129,
856
.arg = "BITS",
857
.doc = "Bit length of the prime number used in the"
858
" Diffie-Hellman key exchange",
859
.group = 2 },
860
{ .name = "priority", .key = 130,
861
.arg = "STRING",
862
.doc = "GnuTLS priority string for the TLS handshake",
863
.group = 1 },
864
{ .name = NULL }
865
};
866
867
error_t parse_opt (int key, char *arg,
868
struct argp_state *state) {
869
/* Get the INPUT argument from `argp_parse', which we know is
870
a pointer to our plugin list pointer. */
871
switch (key) {
872
case 128: /* --debug */
873
debug = true;
874
break;
875
case 'c': /* --connect */
876
connect_to = arg;
877
break;
878
case 'i': /* --interface */
879
interface = arg;
880
break;
881
case 's': /* --seckey */
882
seckey = arg;
883
break;
884
case 'p': /* --pubkey */
885
pubkey = arg;
886
break;
887
case 129: /* --dh-bits */
888
errno = 0;
889
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
890
if (errno){
891
perror("strtol");
892
exit(EXIT_FAILURE);
893
}
894
break;
895
case 130: /* --priority */
896
mc.priority = arg;
897
break;
898
case ARGP_KEY_ARG:
899
argp_usage (state);
900
case ARGP_KEY_END:
901
break;
902
default:
903
return ARGP_ERR_UNKNOWN;
904
}
905
return 0;
906
}
907
908
struct argp argp = { .options = options, .parser = parse_opt,
909
.args_doc = "",
910
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
913
if (ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
920
/* If the interface is down, bring it up */
921
{
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
923
if(sd < 0) {
924
perror("socket");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
930
if(ret == -1){
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
933
goto end;
934
}
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
if(ret == -1){
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
941
goto end;
942
}
943
}
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
948
}
949
950
uid = getuid();
951
gid = getgid();
952
953
ret = setuid(uid);
954
if (ret == -1){
955
perror("setuid");
956
}
957
958
setgid(gid);
959
if (ret == -1){
960
perror("setgid");
961
}
962
963
ret = init_gnutls_global(&mc, pubkey, seckey);
964
if (ret == -1){
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
967
goto end;
968
} else {
969
gnutls_initalized = true;
970
}
971
972
if(mkdtemp(tempdir) == NULL){
973
perror("mkdtemp");
974
tempdir[0] = '\0';
975
goto end;
976
}
977
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
} else {
983
gpgme_initalized = true;
984
}
985
986
if_index = (AvahiIfIndex) if_nametoindex(interface);
987
if(if_index == 0){
988
fprintf(stderr, "No such interface: \"%s\"\n", interface);
989
exit(EXIT_FAILURE);
990
}
991
992
if(connect_to != NULL){
993
/* Connect directly, do not use Zeroconf */
994
/* (Mainly meant for debugging) */
995
char *address = strrchr(connect_to, ':');
996
if(address == NULL){
997
fprintf(stderr, "No colon in address\n");
998
exitcode = EXIT_FAILURE;
999
goto end;
1000
}
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1886
AvahiSServiceBrowser *sb = NULL;
1887
error_t ret_errno;
1888
int ret;
1889
intmax_t tmpmax;
1890
char *tmp;
1891
int exitcode = EXIT_SUCCESS;
1892
char *interfaces_to_take_down = NULL;
1893
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
const char *seckey = PATHDIR "/" SECKEY;
1899
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
1901
1902
bool gnutls_initialized = false;
1903
bool gpgme_initialized = false;
1904
float delay = 2.5f;
1905
double retry_interval = 10; /* 10s between trying a server and
1906
retrying the same server again */
1907
1908
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1909
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1910
1911
uid = getuid();
1912
gid = getgid();
1913
1914
/* Lower any group privileges we might have, just to be safe */
1915
errno = 0;
1916
ret = setgid(gid);
1917
if(ret == -1){
1918
perror_plus("setgid");
1919
}
1920
1921
/* Lower user privileges (temporarily) */
1922
errno = 0;
1923
ret = seteuid(uid);
1924
if(ret == -1){
1925
perror_plus("seteuid");
1926
}
1927
1928
if(quit_now){
1929
goto end;
1930
}
1931
1932
{
1933
struct argp_option options[] = {
1934
{ .name = "debug", .key = 128,
1935
.doc = "Debug mode", .group = 3 },
1936
{ .name = "connect", .key = 'c',
1937
.arg = "ADDRESS:PORT",
1938
.doc = "Connect directly to a specific Mandos server",
1939
.group = 1 },
1940
{ .name = "interface", .key = 'i',
1941
.arg = "NAME",
1942
.doc = "Network interface that will be used to search for"
1943
" Mandos servers",
1944
.group = 1 },
1945
{ .name = "seckey", .key = 's',
1946
.arg = "FILE",
1947
.doc = "OpenPGP secret key file base name",
1948
.group = 1 },
1949
{ .name = "pubkey", .key = 'p',
1950
.arg = "FILE",
1951
.doc = "OpenPGP public key file base name",
1952
.group = 2 },
1953
{ .name = "dh-bits", .key = 129,
1954
.arg = "BITS",
1955
.doc = "Bit length of the prime number used in the"
1956
" Diffie-Hellman key exchange",
1957
.group = 2 },
1958
{ .name = "priority", .key = 130,
1959
.arg = "STRING",
1960
.doc = "GnuTLS priority string for the TLS handshake",
1961
.group = 1 },
1962
{ .name = "delay", .key = 131,
1963
.arg = "SECONDS",
1964
.doc = "Maximum delay to wait for interface startup",
1965
.group = 2 },
1966
{ .name = "retry", .key = 132,
1967
.arg = "SECONDS",
1968
.doc = "Retry interval used when denied by the Mandos server",
1969
.group = 2 },
1970
{ .name = "network-hook-dir", .key = 133,
1971
.arg = "DIR",
1972
.doc = "Directory where network hooks are located",
1973
.group = 2 },
1974
/*
1975
* These reproduce what we would get without ARGP_NO_HELP
1976
*/
1977
{ .name = "help", .key = '?',
1978
.doc = "Give this help list", .group = -1 },
1979
{ .name = "usage", .key = -3,
1980
.doc = "Give a short usage message", .group = -1 },
1981
{ .name = "version", .key = 'V',
1982
.doc = "Print program version", .group = -1 },
1983
{ .name = NULL }
1984
};
1985
1986
error_t parse_opt(int key, char *arg,
1987
struct argp_state *state){
1001
1988
errno = 0;
1002
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1003
if(errno){
1004
perror("Bad port number");
1005
exitcode = EXIT_FAILURE;
1989
switch(key){
1990
case 128: /* --debug */
1991
debug = true;
1992
break;
1993
case 'c': /* --connect */
1994
connect_to = arg;
1995
break;
1996
case 'i': /* --interface */
1997
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1998
arg, (int)',');
1999
if(ret_errno != 0){
2000
argp_error(state, "%s", strerror(ret_errno));
2001
}
2002
break;
2003
case 's': /* --seckey */
2004
seckey = arg;
2005
break;
2006
case 'p': /* --pubkey */
2007
pubkey = arg;
2008
break;
2009
case 129: /* --dh-bits */
2010
errno = 0;
2011
tmpmax = strtoimax(arg, &tmp, 10);
2012
if(errno != 0 or tmp == arg or *tmp != '\0'
2013
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2014
argp_error(state, "Bad number of DH bits");
2015
}
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2017
break;
2018
case 130: /* --priority */
2019
mc.priority = arg;
2020
break;
2021
case 131: /* --delay */
2022
errno = 0;
2023
delay = strtof(arg, &tmp);
2024
if(errno != 0 or tmp == arg or *tmp != '\0'){
2025
argp_error(state, "Bad delay");
2026
}
2027
case 132: /* --retry */
2028
errno = 0;
2029
retry_interval = strtod(arg, &tmp);
2030
if(errno != 0 or tmp == arg or *tmp != '\0'
2031
or (retry_interval * 1000) > INT_MAX
2032
or retry_interval < 0){
2033
argp_error(state, "Bad retry interval");
2034
}
2035
break;
2036
case 133: /* --network-hook-dir */
2037
hookdir = arg;
2038
break;
2039
/*
2040
* These reproduce what we would get without ARGP_NO_HELP
2041
*/
2042
case '?': /* --help */
2043
argp_state_help(state, state->out_stream,
2044
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2045
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2046
case -3: /* --usage */
2047
argp_state_help(state, state->out_stream,
2048
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2049
case 'V': /* --version */
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2051
exit(argp_err_exit_status);
2052
break;
2053
default:
2054
return ARGP_ERR_UNKNOWN;
2055
}
2056
return errno;
2057
}
2058
2059
struct argp argp = { .options = options, .parser = parse_opt,
2060
.args_doc = "",
2061
.doc = "Mandos client -- Get and decrypt"
2062
" passwords from a Mandos server" };
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2066
case 0:
2067
break;
2068
case ENOMEM:
2069
default:
2070
errno = ret;
2071
perror_plus("argp_parse");
2072
exitcode = EX_OSERR;
2073
goto end;
2074
case EINVAL:
2075
exitcode = EX_USAGE;
2076
goto end;
2077
}
2078
}
2079
2080
{
2081
/* Work around Debian bug #633582:
2082
<http://bugs.debian.org/633582> */
2083
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2088
perror_plus("Failed to raise privileges");
2089
} else {
2090
struct stat st;
2091
2092
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2093
int seckey_fd = open(seckey, O_RDONLY);
2094
if(seckey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(seckey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2110
}
2111
}
2112
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2115
if(pubkey_fd == -1){
2116
perror_plus("open");
2117
} else {
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2119
if(ret == -1){
2120
perror_plus("fstat");
2121
} else {
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(pubkey_fd, uid, gid);
2125
if(ret == -1){
2126
perror_plus("fchown");
2127
}
2128
}
2129
}
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2134
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
2139
}
2140
}
2141
}
2142
2143
/* Remove invalid interface names (except "none") */
2144
{
2145
char *interface = NULL;
2146
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2147
interface))){
2148
if(strcmp(interface, "none") != 0
2149
and if_nametoindex(interface) == 0){
2150
if(interface[0] != '\0'){
2151
fprintf_plus(stderr, "Not using nonexisting interface"
2152
" \"%s\"\n", interface);
2153
}
2154
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2155
interface = NULL;
2156
}
2157
}
2158
}
2159
2160
/* Run network hooks */
2161
{
2162
if(mc.interfaces != NULL){
2163
interfaces_hooks = malloc(mc.interfaces_size);
2164
if(interfaces_hooks == NULL){
2165
perror_plus("malloc");
1006
2166
goto end;
1007
2167
}
1008
*address = '\0';
1009
address = connect_to;
1010
ret = start_mandos_communication(address, port, if_index, &mc);
1011
if(ret < 0){
1012
exitcode = EXIT_FAILURE;
1013
} else {
1014
exitcode = EXIT_SUCCESS;
1015
}
1016
goto end;
1017
}
1018
1019
if (not debug){
1020
avahi_set_log_function(empty_log);
1021
}
1022
1023
/* Initialize the pseudo-RNG for Avahi */
1024
srand((unsigned int) time(NULL));
1025
1026
/* Allocate main Avahi loop object */
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if (mc.simple_poll == NULL) {
1029
fprintf(stderr, "Avahi: Failed to create simple poll"
1030
" object.\n");
1031
exitcode = EXIT_FAILURE;
1032
goto end;
1033
}
1034
1035
{
1036
AvahiServerConfig config;
1037
/* Do not publish any local Zeroconf records */
1038
avahi_server_config_init(&config);
1039
config.publish_hinfo = 0;
1040
config.publish_addresses = 0;
1041
config.publish_workstation = 0;
1042
config.publish_domain = 0;
1043
1044
/* Allocate a new server */
1045
mc.server = avahi_server_new(avahi_simple_poll_get
1046
(mc.simple_poll), &config, NULL,
1047
NULL, &error);
1048
1049
/* Free the Avahi configuration data */
1050
avahi_server_config_free(&config);
1051
}
1052
1053
/* Check if creating the Avahi server object succeeded */
1054
if (mc.server == NULL) {
1055
fprintf(stderr, "Failed to create Avahi server: %s\n",
1056
avahi_strerror(error));
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
1060
1061
/* Create the Avahi service browser */
1062
sb = avahi_s_service_browser_new(mc.server, if_index,
1063
AVAHI_PROTO_INET6,
1064
"_mandos._tcp", NULL, 0,
1065
browse_callback, &mc);
1066
if (sb == NULL) {
1067
fprintf(stderr, "Failed to create service browser: %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
exitcode = EXIT_FAILURE;
1070
goto end;
1071
}
1072
1073
/* Run the main loop */
1074
1075
if (debug){
1076
fprintf(stderr, "Starting Avahi loop search\n");
1077
}
1078
1079
avahi_simple_poll_loop(mc.simple_poll);
1080
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2170
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
2173
}
2174
2175
if(not debug){
2176
avahi_set_log_function(empty_log);
2177
}
2178
2179
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2180
from the signal handler */
2181
/* Initialize the pseudo-RNG for Avahi */
2182
srand((unsigned int) time(NULL));
2183
simple_poll = avahi_simple_poll_new();
2184
if(simple_poll == NULL){
2185
fprintf_plus(stderr,
2186
"Avahi: Failed to create simple poll object.\n");
2187
exitcode = EX_UNAVAILABLE;
2188
goto end;
2189
}
2190
2191
sigemptyset(&sigterm_action.sa_mask);
2192
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2193
if(ret == -1){
2194
perror_plus("sigaddset");
2195
exitcode = EX_OSERR;
2196
goto end;
2197
}
2198
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2199
if(ret == -1){
2200
perror_plus("sigaddset");
2201
exitcode = EX_OSERR;
2202
goto end;
2203
}
2204
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2205
if(ret == -1){
2206
perror_plus("sigaddset");
2207
exitcode = EX_OSERR;
2208
goto end;
2209
}
2210
/* Need to check if the handler is SIG_IGN before handling:
2211
| [[info:libc:Initial Signal Actions]] |
2212
| [[info:libc:Basic Signal Handling]] |
2213
*/
2214
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2215
if(ret == -1){
2216
perror_plus("sigaction");
2217
return EX_OSERR;
2218
}
2219
if(old_sigterm_action.sa_handler != SIG_IGN){
2220
ret = sigaction(SIGINT, &sigterm_action, NULL);
2221
if(ret == -1){
2222
perror_plus("sigaction");
2223
exitcode = EX_OSERR;
2224
goto end;
2225
}
2226
}
2227
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2228
if(ret == -1){
2229
perror_plus("sigaction");
2230
return EX_OSERR;
2231
}
2232
if(old_sigterm_action.sa_handler != SIG_IGN){
2233
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2234
if(ret == -1){
2235
perror_plus("sigaction");
2236
exitcode = EX_OSERR;
2237
goto end;
2238
}
2239
}
2240
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2241
if(ret == -1){
2242
perror_plus("sigaction");
2243
return EX_OSERR;
2244
}
2245
if(old_sigterm_action.sa_handler != SIG_IGN){
2246
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2247
if(ret == -1){
2248
perror_plus("sigaction");
2249
exitcode = EX_OSERR;
2250
goto end;
2251
}
2252
}
2253
2254
/* If no interfaces were specified, make a list */
2255
if(mc.interfaces == NULL){
2256
struct dirent **direntries = NULL;
2257
/* Look for any good interfaces */
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2259
alphasort);
2260
if(ret >= 1){
2261
/* Add all found interfaces to interfaces list */
2262
for(int i = 0; i < ret; ++i){
2263
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2264
direntries[i]->d_name);
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("argz_add");
2268
continue;
2269
}
2270
if(debug){
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
direntries[i]->d_name);
2273
}
2274
}
2275
free(direntries);
2276
} else {
2277
if(ret == 0){
2278
free(direntries);
2279
}
2280
fprintf_plus(stderr, "Could not find a network interface\n");
2281
exitcode = EXIT_FAILURE;
2282
goto end;
2283
}
2284
}
2285
2286
/* Bring up interfaces which are down, and remove any "none"s */
2287
{
2288
char *interface = NULL;
2289
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2290
interface))){
2291
/* If interface name is "none", stop bringing up interfaces.
2292
Also remove all instances of "none" from the list */
2293
if(strcmp(interface, "none") == 0){
2294
argz_delete(&mc.interfaces, &mc.interfaces_size,
2295
interface);
2296
interface = NULL;
2297
while((interface = argz_next(mc.interfaces,
2298
mc.interfaces_size, interface))){
2299
if(strcmp(interface, "none") == 0){
2300
argz_delete(&mc.interfaces, &mc.interfaces_size,
2301
interface);
2302
interface = NULL;
2303
}
2304
}
2305
break;
2306
}
2307
bool interface_was_up = interface_is_up(interface);
2308
errno = bring_up_interface(interface, delay);
2309
if(not interface_was_up){
2310
if(errno != 0){
2311
perror_plus("Failed to bring up interface");
2312
} else {
2313
errno = argz_add(&interfaces_to_take_down,
2314
&interfaces_to_take_down_size,
2315
interface);
2316
if(errno != 0){
2317
perror_plus("argz_add");
2318
}
2319
}
2320
}
2321
}
2322
if(debug and (interfaces_to_take_down == NULL)){
2323
fprintf_plus(stderr, "No interfaces were brought up\n");
2324
}
2325
}
2326
2327
/* If we only got one interface, explicitly use only that one */
2328
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2329
if(debug){
2330
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2331
mc.interfaces);
2332
}
2333
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2334
}
2335
2336
if(quit_now){
2337
goto end;
2338
}
2339
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2341
if(ret == -1){
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
2343
exitcode = EX_UNAVAILABLE;
2344
goto end;
2345
} else {
2346
gnutls_initialized = true;
2347
}
2348
2349
if(quit_now){
2350
goto end;
2351
}
2352
2353
/* Try /run/tmp before /tmp */
2354
tempdir = mkdtemp(run_tempdir);
2355
if(tempdir == NULL and errno == ENOENT){
2356
if(debug){
2357
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2358
run_tempdir, old_tempdir);
2359
}
2360
tempdir = mkdtemp(old_tempdir);
2361
}
2362
if(tempdir == NULL){
2363
perror_plus("mkdtemp");
2364
goto end;
2365
}
2366
2367
if(quit_now){
2368
goto end;
2369
}
2370
2371
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2372
fprintf_plus(stderr, "init_gpgme failed\n");
2373
exitcode = EX_UNAVAILABLE;
2374
goto end;
2375
} else {
2376
gpgme_initialized = true;
2377
}
2378
2379
if(quit_now){
2380
goto end;
2381
}
2382
2383
if(connect_to != NULL){
2384
/* Connect directly, do not use Zeroconf */
2385
/* (Mainly meant for debugging) */
2386
char *address = strrchr(connect_to, ':');
2387
2388
if(address == NULL){
2389
fprintf_plus(stderr, "No colon in address\n");
2390
exitcode = EX_USAGE;
2391
goto end;
2392
}
2393
2394
if(quit_now){
2395
goto end;
2396
}
2397
2398
in_port_t port;
2399
errno = 0;
2400
tmpmax = strtoimax(address+1, &tmp, 10);
2401
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2402
or tmpmax != (in_port_t)tmpmax){
2403
fprintf_plus(stderr, "Bad port number\n");
2404
exitcode = EX_USAGE;
2405
goto end;
2406
}
2407
2408
if(quit_now){
2409
goto end;
2410
}
2411
2412
port = (in_port_t)tmpmax;
2413
*address = '\0';
2414
/* Colon in address indicates IPv6 */
2415
int af;
2416
if(strchr(connect_to, ':') != NULL){
2417
af = AF_INET6;
2418
/* Accept [] around IPv6 address - see RFC 5952 */
2419
if(connect_to[0] == '[' and address[-1] == ']')
2420
{
2421
connect_to++;
2422
address[-1] = '\0';
2423
}
2424
} else {
2425
af = AF_INET;
2426
}
2427
address = connect_to;
2428
2429
if(quit_now){
2430
goto end;
2431
}
2432
2433
while(not quit_now){
2434
ret = start_mandos_communication(address, port, if_index, af,
2435
&mc);
2436
if(quit_now or ret == 0){
2437
break;
2438
}
2439
if(debug){
2440
fprintf_plus(stderr, "Retrying in %d seconds\n",
2441
(int)retry_interval);
2442
}
2443
sleep((unsigned int)retry_interval);
2444
}
2445
2446
if(not quit_now){
2447
exitcode = EXIT_SUCCESS;
2448
}
2449
2450
goto end;
2451
}
2452
2453
if(quit_now){
2454
goto end;
2455
}
2456
2457
{
2458
AvahiServerConfig config;
2459
/* Do not publish any local Zeroconf records */
2460
avahi_server_config_init(&config);
2461
config.publish_hinfo = 0;
2462
config.publish_addresses = 0;
2463
config.publish_workstation = 0;
2464
config.publish_domain = 0;
2465
2466
/* Allocate a new server */
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2468
&config, NULL, NULL, &ret_errno);
2469
2470
/* Free the Avahi configuration data */
2471
avahi_server_config_free(&config);
2472
}
2473
2474
/* Check if creating the Avahi server object succeeded */
2475
if(mc.server == NULL){
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2477
avahi_strerror(ret_errno));
2478
exitcode = EX_UNAVAILABLE;
2479
goto end;
2480
}
2481
2482
if(quit_now){
2483
goto end;
2484
}
2485
2486
/* Create the Avahi service browser */
2487
sb = avahi_s_service_browser_new(mc.server, if_index,
2488
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2489
NULL, 0, browse_callback,
2490
(void *)&mc);
2491
if(sb == NULL){
2492
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2493
avahi_strerror(avahi_server_errno(mc.server)));
2494
exitcode = EX_UNAVAILABLE;
2495
goto end;
2496
}
2497
2498
if(quit_now){
2499
goto end;
2500
}
2501
2502
/* Run the main loop */
2503
2504
if(debug){
2505
fprintf_plus(stderr, "Starting Avahi loop search\n");
2506
}
2507
2508
ret = avahi_loop_with_timeout(simple_poll,
2509
(int)(retry_interval * 1000), &mc);
2510
if(debug){
2511
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2512
(ret == 0) ? "successfully" : "with error");
2513
}
2514
1081
2515
end:
1082
1083
if (debug){
1084
fprintf(stderr, "%s exiting\n", argv[0]);
1085
}
1086
1087
/* Cleanup things */
1088
if (sb != NULL)
1089
avahi_s_service_browser_free(sb);
1090
1091
if (mc.server != NULL)
1092
avahi_server_free(mc.server);
1093
1094
if (mc.simple_poll != NULL)
1095
avahi_simple_poll_free(mc.simple_poll);
1096
1097
if (gnutls_initalized){
1098
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit ();
1100
gnutls_dh_params_deinit(mc.dh_params);
1101
}
1102
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
closedir(d);
1137
}
1138
ret = rmdir(tempdir);
1139
if(ret == -1){
1140
perror("rmdir");
1141
}
1142
}
1143
1144
return exitcode;
2516
2517
if(debug){
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2519
}
2520
2521
/* Cleanup things */
2522
free(mc.interfaces);
2523
2524
if(sb != NULL)
2525
avahi_s_service_browser_free(sb);
2526
2527
if(mc.server != NULL)
2528
avahi_server_free(mc.server);
2529
2530
if(simple_poll != NULL)
2531
avahi_simple_poll_free(simple_poll);
2532
2533
if(gnutls_initialized){
2534
gnutls_certificate_free_credentials(mc.cred);
2535
gnutls_global_deinit();
2536
gnutls_dh_params_deinit(mc.dh_params);
2537
}
2538
2539
if(gpgme_initialized){
2540
gpgme_release(mc.ctx);
2541
}
2542
2543
/* Cleans up the circular linked list of Mandos servers the client
2544
has seen */
2545
if(mc.current_server != NULL){
2546
mc.current_server->prev->next = NULL;
2547
while(mc.current_server != NULL){
2548
server *next = mc.current_server->next;
2549
free(mc.current_server);
2550
mc.current_server = next;
2551
}
2552
}
2553
2554
/* Re-raise privileges */
2555
{
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
2559
perror_plus("Failed to raise privileges");
2560
} else {
2561
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2565
2566
/* Take down the network interfaces which were brought up */
2567
{
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to take down interface");
2576
}
2577
}
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2580
" down\n");
2581
}
2582
}
2583
}
2584
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
2588
perror_plus("Failed to lower privileges permanently");
2589
}
2590
}
2591
2592
free(interfaces_to_take_down);
2593
free(interfaces_hooks);
2594
2595
/* Removes the GPGME temp directory and all files inside */
2596
if(tempdir != NULL){
2597
struct dirent **direntries = NULL;
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2634
}
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2636
}
2637
}
2638
2639
if(quit_now){
2640
sigemptyset(&old_sigterm_action.sa_mask);
2641
old_sigterm_action.sa_handler = SIG_DFL;
2642
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2643
&old_sigterm_action,
2644
NULL));
2645
if(ret == -1){
2646
perror_plus("sigaction");
2647
}
2648
do {
2649
ret = raise(signal_received);
2650
} while(ret != 0 and errno == EINTR);
2651
if(ret != 0){
2652
perror_plus("raise");
2653
abort();
2654
}
2655
TEMP_FAILURE_RETRY(pause());
2656
}
2657
2658
return exitcode;
1145
2659
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0