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- Committer: Björn Påhlsson
- Date: 2011-06-23 22:27:15 UTC
- mto: This revision was merged to the branch mainline in revision 485.
- Revision ID: belorn@fukt.bsnet.se-20110623222715-q5wro9ma9iyjl367
* Makefile (CFLAGS): Added "-lrt" to include real time library.
* plugins.d/mandos-client.c: use scandir(3) instead of readdir(3)
Prefix all debug output with "Mandos plugin " + program_invocation_short_name
Retry servers that failed to provide password.
New option --retry SECONDS that sets the interval between rechecking.
--retry also controls how often it retries a server when using --connect.
* plugins.d/splashy.c: Prefix all debug output with "Mandos plugin " + program_invocation_short_name
* plugins.d/usplash.c: --||--
* plugins.d/askpass-fifo.c: --||--
* plugins.d/password-prompt.c: --||--
* plugins.d/plymouth.c: --||--
* mandos: Lower logger level from warning to info on failed client requests because client was disabled or unknown fingerprint.
* plugins.d/plymouth.c (get_pid): bug fix. Was not calling free on direntries.
* plugins.d/mandos-client.c: use scandir(3) instead of readdir(3)
Prefix all debug output with "Mandos plugin " + program_invocation_short_name
Retry servers that failed to provide password.
New option --retry SECONDS that sets the interval between rechecking.
--retry also controls how often it retries a server when using --connect.
* plugins.d/splashy.c: Prefix all debug output with "Mandos plugin " + program_invocation_short_name
* plugins.d/usplash.c: --||--
* plugins.d/askpass-fifo.c: --||--
* plugins.d/password-prompt.c: --||--
* plugins.d/plymouth.c: --||--
* mandos: Lower logger level from warning to info on failed client requests because client was disabled or unknown fingerprint.
* plugins.d/plymouth.c (get_pid): bug fix. Was not calling free on direntries.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
34
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
42
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno, program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#ifdef __linux__
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
91
92
/* Avahi */
93
/* All Avahi types, constants and functions
94
Avahi*, avahi_*,
95
AVAHI_* */
43
96
#include <avahi-core/core.h>
44
97
#include <avahi-core/lookup.h>
45
98
#include <avahi-core/log.h>
47
100
#include <avahi-common/malloc.h>
48
101
#include <avahi-common/error.h>
49
102
50
//mandos client part
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
56
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
63
64
// gpgme
65
#include <errno.h> /* perror() */
66
#include <gpgme.h>
67
68
// getopt long
69
#include <getopt.h>
103
/* GnuTLS */
104
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
105
functions:
106
gnutls_*
107
init_gnutls_session(),
108
GNUTLS_* */
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
112
113
/* GPGME */
114
#include <gpgme.h> /* All GPGME types, constants and
115
functions:
116
gpgme_*
117
GPGME_PROTOCOL_OpenPGP,
118
GPG_ERR_NO_* */
70
119
71
120
#define BUFFER_SIZE 256
72
#define DH_BITS 1024
73
121
74
static const char *certdir = "/conf/conf.d/mandos";
75
static const char *certfile = "openpgp-client.txt";
76
static const char *certkey = "openpgp-client-key.txt";
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
77
125
78
126
bool debug = false;
79
127
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
132
133
/* Doubly linked list that need to be circular linked when ever used */
134
typedef struct server{
135
const char *ip;
136
uint16_t port;
137
AvahiIfIndex if_index;
138
int af;
139
struct timespec last_seen;
140
struct server *next;
141
struct server *prev;
142
} server;
143
144
/* Used for passing in values through the Avahi callback functions */
80
145
typedef struct {
81
gnutls_session_t session;
146
AvahiSimplePoll *simple_poll;
147
AvahiServer *server;
82
148
gnutls_certificate_credentials_t cred;
149
unsigned int dh_bits;
83
150
gnutls_dh_params_t dh_params;
84
} encrypted_session;
85
86
87
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet,
89
const char *homedir){
90
gpgme_data_t dh_crypto, dh_plain;
151
const char *priority;
91
152
gpgme_ctx_t ctx;
153
server *current_server;
154
} mandos_context;
155
156
/* global context so signal handler can reach it*/
157
mandos_context mc = { .simple_poll = NULL, .server = NULL,
158
.dh_bits = 1024, .priority = "SECURE256"
159
":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };
160
161
sig_atomic_t quit_now = 0;
162
int signal_received = 0;
163
164
/* Function to use when printing errors */
165
void perror_plus(const char *print_text){
166
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
167
perror(print_text);
168
}
169
170
/*
171
* Make additional room in "buffer" for at least BUFFER_SIZE more
172
* bytes. "buffer_capacity" is how much is currently allocated,
173
* "buffer_length" is how much is already used.
174
*/
175
size_t incbuffer(char **buffer, size_t buffer_length,
176
size_t buffer_capacity){
177
if(buffer_length + BUFFER_SIZE > buffer_capacity){
178
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
179
if(buffer == NULL){
180
return 0;
181
}
182
buffer_capacity += BUFFER_SIZE;
183
}
184
return buffer_capacity;
185
}
186
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
189
int af){
190
int ret;
191
server *new_server = malloc(sizeof(server));
192
if(new_server == NULL){
193
perror_plus("malloc");
194
return -1;
195
}
196
*new_server = (server){ .ip = strdup(ip),
197
.port = port,
198
.if_index = if_index,
199
.af = af };
200
if(new_server->ip == NULL){
201
perror_plus("strdup");
202
return -1;
203
}
204
/* uniqe case of first server */
205
if (mc.current_server == NULL){
206
new_server->next = new_server;
207
new_server->prev = new_server;
208
mc.current_server = new_server;
209
/* Placing the new server last in the list */
210
} else {
211
new_server->next = mc.current_server;
212
new_server->prev = mc.current_server->prev;
213
new_server->prev->next = new_server;
214
mc.current_server->prev = new_server;
215
}
216
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
217
if(ret == -1){
218
perror_plus("clock_gettime");
219
return -1;
220
}
221
return 0;
222
}
223
224
/*
225
* Initialize GPGME.
226
*/
227
static bool init_gpgme(const char *seckey,
228
const char *pubkey, const char *tempdir){
92
229
gpgme_error_t rc;
93
ssize_t ret;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
96
230
gpgme_engine_info_t engine_info;
97
98
if (debug){
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
231
232
233
/*
234
* Helper function to insert pub and seckey to the engine keyring.
235
*/
236
bool import_key(const char *filename){
237
int ret;
238
int fd;
239
gpgme_data_t pgp_data;
240
241
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
242
if(fd == -1){
243
perror_plus("open");
244
return false;
245
}
246
247
rc = gpgme_data_new_from_fd(&pgp_data, fd);
248
if(rc != GPG_ERR_NO_ERROR){
249
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
250
gpgme_strsource(rc), gpgme_strerror(rc));
251
return false;
252
}
253
254
rc = gpgme_op_import(mc.ctx, pgp_data);
255
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
258
return false;
259
}
260
261
ret = (int)TEMP_FAILURE_RETRY(close(fd));
262
if(ret == -1){
263
perror_plus("close");
264
}
265
gpgme_data_release(pgp_data);
266
return true;
267
}
268
269
if(debug){
270
fprintf(stderr, "Initializing GPGME\n");
100
271
}
101
272
102
273
/* Init GPGME */
103
274
gpgme_check_version(NULL);
104
275
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
105
if (rc != GPG_ERR_NO_ERROR){
276
if(rc != GPG_ERR_NO_ERROR){
106
277
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
107
278
gpgme_strsource(rc), gpgme_strerror(rc));
108
return -1;
279
return false;
109
280
}
110
281
111
/* Set GPGME home directory */
112
rc = gpgme_get_engine_info (&engine_info);
113
if (rc != GPG_ERR_NO_ERROR){
282
/* Set GPGME home directory for the OpenPGP engine only */
283
rc = gpgme_get_engine_info(&engine_info);
284
if(rc != GPG_ERR_NO_ERROR){
114
285
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
115
286
gpgme_strsource(rc), gpgme_strerror(rc));
116
return -1;
287
return false;
117
288
}
118
289
while(engine_info != NULL){
119
290
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
120
291
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
121
engine_info->file_name, homedir);
292
engine_info->file_name, tempdir);
122
293
break;
123
294
}
124
295
engine_info = engine_info->next;
125
296
}
126
297
if(engine_info == NULL){
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
128
return -1;
129
}
130
131
/* Create new GPGME data buffer from packet buffer */
132
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
133
if (rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
299
return false;
300
}
301
302
/* Create new GPGME "context" */
303
rc = gpgme_new(&(mc.ctx));
304
if(rc != GPG_ERR_NO_ERROR){
305
fprintf(stderr, "bad gpgme_new: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
307
return false;
308
}
309
310
if(not import_key(pubkey) or not import_key(seckey)){
311
return false;
312
}
313
314
return true;
315
}
316
317
/*
318
* Decrypt OpenPGP data.
319
* Returns -1 on error
320
*/
321
static ssize_t pgp_packet_decrypt(const char *cryptotext,
322
size_t crypto_size,
323
char **plaintext){
324
gpgme_data_t dh_crypto, dh_plain;
325
gpgme_error_t rc;
326
ssize_t ret;
327
size_t plaintext_capacity = 0;
328
ssize_t plaintext_length = 0;
329
330
if(debug){
331
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
332
}
333
334
/* Create new GPGME data buffer from memory cryptotext */
335
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
336
0);
337
if(rc != GPG_ERR_NO_ERROR){
134
338
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
135
339
gpgme_strsource(rc), gpgme_strerror(rc));
136
340
return -1;
138
342
139
343
/* Create new empty GPGME data buffer for the plaintext */
140
344
rc = gpgme_data_new(&dh_plain);
141
if (rc != GPG_ERR_NO_ERROR){
345
if(rc != GPG_ERR_NO_ERROR){
142
346
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
143
347
gpgme_strsource(rc), gpgme_strerror(rc));
144
return -1;
145
}
146
147
/* Create new GPGME "context" */
148
rc = gpgme_new(&ctx);
149
if (rc != GPG_ERR_NO_ERROR){
150
fprintf(stderr, "bad gpgme_new: %s: %s\n",
151
gpgme_strsource(rc), gpgme_strerror(rc));
152
return -1;
153
}
154
155
/* Decrypt data from the FILE pointer to the plaintext data
156
buffer */
157
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
158
if (rc != GPG_ERR_NO_ERROR){
348
gpgme_data_release(dh_crypto);
349
return -1;
350
}
351
352
/* Decrypt data from the cryptotext data buffer to the plaintext
353
data buffer */
354
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
355
if(rc != GPG_ERR_NO_ERROR){
159
356
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
160
357
gpgme_strsource(rc), gpgme_strerror(rc));
161
return -1;
162
}
163
164
if(debug){
165
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
166
}
167
168
if (debug){
169
gpgme_decrypt_result_t result;
170
result = gpgme_op_decrypt_result(ctx);
171
if (result == NULL){
172
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
173
} else {
174
fprintf(stderr, "Unsupported algorithm: %s\n",
175
result->unsupported_algorithm);
176
fprintf(stderr, "Wrong key usage: %d\n",
177
result->wrong_key_usage);
178
if(result->file_name != NULL){
179
fprintf(stderr, "File name: %s\n", result->file_name);
180
}
181
gpgme_recipient_t recipient;
182
recipient = result->recipients;
183
if(recipient){
358
plaintext_length = -1;
359
if(debug){
360
gpgme_decrypt_result_t result;
361
result = gpgme_op_decrypt_result(mc.ctx);
362
if(result == NULL){
363
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
364
} else {
365
fprintf(stderr, "Unsupported algorithm: %s\n",
366
result->unsupported_algorithm);
367
fprintf(stderr, "Wrong key usage: %u\n",
368
result->wrong_key_usage);
369
if(result->file_name != NULL){
370
fprintf(stderr, "File name: %s\n", result->file_name);
371
}
372
gpgme_recipient_t recipient;
373
recipient = result->recipients;
184
374
while(recipient != NULL){
185
375
fprintf(stderr, "Public key algorithm: %s\n",
186
376
gpgme_pubkey_algo_name(recipient->pubkey_algo));
192
382
}
193
383
}
194
384
}
385
goto decrypt_end;
195
386
}
196
387
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
388
if(debug){
389
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
390
}
199
391
200
392
/* Seek back to the beginning of the GPGME plaintext data buffer */
201
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
202
perror("pgpme_data_seek");
393
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
394
perror_plus("gpgme_data_seek");
395
plaintext_length = -1;
396
goto decrypt_end;
203
397
}
204
398
205
*new_packet = 0;
399
*plaintext = NULL;
206
400
while(true){
207
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
208
*new_packet = realloc(*new_packet,
209
(unsigned int)new_packet_capacity
210
+ BUFFER_SIZE);
211
if (*new_packet == NULL){
212
perror("realloc");
213
return -1;
214
}
215
new_packet_capacity += BUFFER_SIZE;
401
plaintext_capacity = incbuffer(plaintext,
402
(size_t)plaintext_length,
403
plaintext_capacity);
404
if(plaintext_capacity == 0){
405
perror_plus("incbuffer");
406
plaintext_length = -1;
407
goto decrypt_end;
216
408
}
217
409
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
410
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
411
BUFFER_SIZE);
220
412
/* Print the data, if any */
221
if (ret == 0){
413
if(ret == 0){
414
/* EOF */
222
415
break;
223
416
}
224
417
if(ret < 0){
225
perror("gpgme_data_read");
226
return -1;
227
}
228
new_packet_length += ret;
229
}
230
231
/* FIXME: check characters before printing to screen so to not print
232
terminal control characters */
233
/* if(debug){ */
234
/* fprintf(stderr, "decrypted password is: "); */
235
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
236
/* fprintf(stderr, "\n"); */
237
/* } */
418
perror_plus("gpgme_data_read");
419
plaintext_length = -1;
420
goto decrypt_end;
421
}
422
plaintext_length += ret;
423
}
424
425
if(debug){
426
fprintf(stderr, "Decrypted password is: ");
427
for(ssize_t i = 0; i < plaintext_length; i++){
428
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
429
}
430
fprintf(stderr, "\n");
431
}
432
433
decrypt_end:
434
435
/* Delete the GPGME cryptotext data buffer */
436
gpgme_data_release(dh_crypto);
238
437
239
438
/* Delete the GPGME plaintext data buffer */
240
439
gpgme_data_release(dh_plain);
241
return new_packet_length;
440
return plaintext_length;
242
441
}
243
442
244
static const char * safer_gnutls_strerror (int value) {
245
const char *ret = gnutls_strerror (value);
246
if (ret == NULL)
443
static const char * safer_gnutls_strerror(int value){
444
const char *ret = gnutls_strerror(value); /* Spurious warning from
445
-Wunreachable-code */
446
if(ret == NULL)
247
447
ret = "(unknown)";
248
448
return ret;
249
449
}
250
450
451
/* GnuTLS log function callback */
251
452
static void debuggnutls(__attribute__((unused)) int level,
252
453
const char* string){
253
fprintf(stderr, "%s", string);
454
fprintf(stderr, "GnuTLS: %s", string);
254
455
}
255
456
256
static int initgnutls(encrypted_session *es){
257
const char *err;
457
static int init_gnutls_global(const char *pubkeyfilename,
458
const char *seckeyfilename){
258
459
int ret;
259
460
260
461
if(debug){
261
462
fprintf(stderr, "Initializing GnuTLS\n");
262
463
}
263
264
if ((ret = gnutls_global_init ())
265
!= GNUTLS_E_SUCCESS) {
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
464
465
ret = gnutls_global_init();
466
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "GnuTLS global_init: %s\n",
468
safer_gnutls_strerror(ret));
267
469
return -1;
268
470
}
269
270
if (debug){
471
472
if(debug){
473
/* "Use a log level over 10 to enable all debugging options."
474
* - GnuTLS manual
475
*/
271
476
gnutls_global_set_log_level(11);
272
477
gnutls_global_set_log_function(debuggnutls);
273
478
}
274
479
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
277
!= GNUTLS_E_SUCCESS) {
278
fprintf (stderr, "memory error: %s\n",
279
safer_gnutls_strerror(ret));
480
/* OpenPGP credentials */
481
gnutls_certificate_allocate_credentials(&mc.cred);
482
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
484
from
485
-Wunreachable-code
486
*/
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
280
489
return -1;
281
490
}
282
491
283
492
if(debug){
284
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
285
" and keyfile %s as GnuTLS credentials\n", certfile,
286
certkey);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
287
496
}
288
497
289
498
ret = gnutls_certificate_set_openpgp_key_file
290
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
291
if (ret != GNUTLS_E_SUCCESS) {
292
fprintf
293
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
294
" '%s')\n",
295
ret, certfile, certkey);
296
fprintf(stdout, "The Error is: %s\n",
297
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
301
//GnuTLS server initialization
302
if ((ret = gnutls_dh_params_init (&es->dh_params))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in dh parameter initialization: %s\n",
305
safer_gnutls_strerror(ret));
306
return -1;
307
}
308
309
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
310
!= GNUTLS_E_SUCCESS) {
311
fprintf (stderr, "Error in prime generation: %s\n",
312
safer_gnutls_strerror(ret));
313
return -1;
314
}
315
316
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
317
318
// GnuTLS session creation
319
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
320
!= GNUTLS_E_SUCCESS){
499
(mc.cred, pubkeyfilename, seckeyfilename,
500
GNUTLS_OPENPGP_FMT_BASE64);
501
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
507
goto globalfail;
508
}
509
510
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
515
goto globalfail;
516
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
521
goto globalfail;
522
}
523
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
525
526
return 0;
527
528
globalfail:
529
530
gnutls_certificate_free_credentials(mc.cred);
531
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
533
return -1;
534
}
535
536
static int init_gnutls_session(gnutls_session_t *session){
537
int ret;
538
/* GnuTLS session creation */
539
do {
540
ret = gnutls_init(session, GNUTLS_SERVER);
541
if(quit_now){
542
return -1;
543
}
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
if(ret != GNUTLS_E_SUCCESS){
321
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
322
547
safer_gnutls_strerror(ret));
323
548
}
324
549
325
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
326
!= GNUTLS_E_SUCCESS) {
327
fprintf(stderr, "Syntax error at: %s\n", err);
328
fprintf(stderr, "GnuTLS error: %s\n",
329
safer_gnutls_strerror(ret));
330
return -1;
550
{
551
const char *err;
552
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
554
if(quit_now){
555
gnutls_deinit(*session);
556
return -1;
557
}
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
563
gnutls_deinit(*session);
564
return -1;
565
}
331
566
}
332
567
333
if ((ret = gnutls_credentials_set
334
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
335
!= GNUTLS_E_SUCCESS) {
336
fprintf(stderr, "Error setting a credentials set: %s\n",
568
do {
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
571
if(quit_now){
572
gnutls_deinit(*session);
573
return -1;
574
}
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
337
578
safer_gnutls_strerror(ret));
579
gnutls_deinit(*session);
338
580
return -1;
339
581
}
340
582
341
583
/* ignore client certificate if any. */
342
gnutls_certificate_server_set_request (es->session,
343
GNUTLS_CERT_IGNORE);
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
344
585
345
gnutls_dh_set_prime_bits (es->session, DH_BITS);
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
346
587
347
588
return 0;
348
589
}
349
590
591
/* Avahi log function callback */
350
592
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
351
593
__attribute__((unused)) const char *txt){}
352
594
595
/* Called when a Mandos server is found */
353
596
static int start_mandos_communication(const char *ip, uint16_t port,
354
AvahiIfIndex if_index){
355
int ret, tcp_sd;
356
struct sockaddr_in6 to;
357
encrypted_session es;
597
AvahiIfIndex if_index,
598
int af){
599
int ret, tcp_sd = -1;
600
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
358
605
char *buffer = NULL;
359
char *decrypted_buffer;
606
char *decrypted_buffer = NULL;
360
607
size_t buffer_length = 0;
361
608
size_t buffer_capacity = 0;
362
ssize_t decrypted_buffer_size;
363
size_t written = 0;
364
int retval = 0;
365
char interface[IF_NAMESIZE];
366
367
if(debug){
368
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
369
ip, port);
370
}
371
372
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
373
if(tcp_sd < 0) {
374
perror("socket");
375
return -1;
376
}
377
378
if(debug){
379
if(if_indextoname((unsigned int)if_index, interface) == NULL){
380
if(debug){
381
perror("if_indextoname");
382
}
383
return -1;
384
}
385
386
fprintf(stderr, "Binding to interface %s\n", interface);
387
}
388
389
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
392
if (ret < 0 ){
393
perror("inet_pton");
394
return -1;
395
}
609
size_t written;
610
int retval = -1;
611
gnutls_session_t session;
612
int pf; /* Protocol family */
613
614
errno = 0;
615
616
if(quit_now){
617
errno = EINTR;
618
return -1;
619
}
620
621
switch(af){
622
case AF_INET6:
623
pf = PF_INET6;
624
break;
625
case AF_INET:
626
pf = PF_INET;
627
break;
628
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
630
errno = EINVAL;
631
return -1;
632
}
633
634
ret = init_gnutls_session(&session);
635
if(ret != 0){
636
return -1;
637
}
638
639
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
642
}
643
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
645
if(tcp_sd < 0){
646
int e = errno;
647
perror_plus("socket");
648
errno = e;
649
goto mandos_end;
650
}
651
652
if(quit_now){
653
errno = EINTR;
654
goto mandos_end;
655
}
656
657
memset(&to, 0, sizeof(to));
658
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
661
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
664
}
665
if(ret < 0 ){
666
int e = errno;
667
perror_plus("inet_pton");
668
errno = e;
669
goto mandos_end;
670
}
396
671
if(ret == 0){
672
int e = errno;
397
673
fprintf(stderr, "Bad address: %s\n", ip);
398
return -1;
399
}
400
to.sin6_port = htons(port); /* Spurious warning */
674
errno = e;
675
goto mandos_end;
676
}
677
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
685
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
688
errno = EINVAL;
689
goto mandos_end;
690
}
691
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
693
}
694
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
698
}
401
699
402
to.sin6_scope_id = (uint32_t)if_index;
700
if(quit_now){
701
errno = EINTR;
702
goto mandos_end;
703
}
403
704
404
705
if(debug){
405
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
406
/* char addrstr[INET6_ADDRSTRLEN]; */
407
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
408
/* sizeof(addrstr)) == NULL){ */
409
/* perror("inet_ntop"); */
410
/* } else { */
411
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
412
/* addrstr, ntohs(to.sin6_port)); */
413
/* } */
414
}
415
416
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
417
if (ret < 0){
418
perror("connect");
419
return -1;
420
}
421
422
ret = initgnutls (&es);
423
if (ret != 0){
424
retval = -1;
425
return -1;
426
}
427
428
gnutls_transport_set_ptr (es.session,
429
(gnutls_transport_ptr_t) tcp_sd);
706
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
707
char interface[IF_NAMESIZE];
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
perror_plus("if_indextoname");
710
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
713
}
714
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
717
}
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
724
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
727
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
730
} else {
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
733
}
734
}
735
}
736
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
744
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
}
747
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
759
}
760
761
const char *out = mandos_protocol_version;
762
written = 0;
763
while(true){
764
size_t out_size = strlen(out);
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
767
if(ret == -1){
768
int e = errno;
769
perror_plus("write");
770
errno = e;
771
goto mandos_end;
772
}
773
written += (size_t)ret;
774
if(written < out_size){
775
continue;
776
} else {
777
if(out == mandos_protocol_version){
778
written = 0;
779
out = "\r\n";
780
} else {
781
break;
782
}
783
}
784
785
if(quit_now){
786
errno = EINTR;
787
goto mandos_end;
788
}
789
}
430
790
431
791
if(debug){
432
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
433
793
}
434
794
435
ret = gnutls_handshake (es.session);
436
437
if (ret != GNUTLS_E_SUCCESS){
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
798
}
799
800
/* Spurious warnings from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
802
803
if(quit_now){
804
errno = EINTR;
805
goto mandos_end;
806
}
807
808
do {
809
ret = gnutls_handshake(session);
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
814
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
815
816
if(ret != GNUTLS_E_SUCCESS){
438
817
if(debug){
439
fprintf(stderr, "\n*** Handshake failed ***\n");
440
gnutls_perror (ret);
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
819
gnutls_perror(ret);
441
820
}
442
retval = -1;
443
goto exit;
821
errno = EPROTO;
822
goto mandos_end;
444
823
}
445
824
446
//Retrieve OpenPGP packet that contains the wanted password
825
/* Read OpenPGP packet that contains the wanted password */
447
826
448
827
if(debug){
449
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
450
829
ip);
451
830
}
452
831
453
832
while(true){
454
if (buffer_length + BUFFER_SIZE > buffer_capacity){
455
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
456
if (buffer == NULL){
457
perror("realloc");
458
goto exit;
459
}
460
buffer_capacity += BUFFER_SIZE;
461
}
462
463
ret = gnutls_record_recv
464
(es.session, buffer+buffer_length, BUFFER_SIZE);
465
if (ret == 0){
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
841
if(buffer_capacity == 0){
842
int e = errno;
843
perror_plus("incbuffer");
844
errno = e;
845
goto mandos_end;
846
}
847
848
if(quit_now){
849
errno = EINTR;
850
goto mandos_end;
851
}
852
853
sret = gnutls_record_recv(session, buffer+buffer_length,
854
BUFFER_SIZE);
855
if(sret == 0){
466
856
break;
467
857
}
468
if (ret < 0){
469
switch(ret){
858
if(sret < 0){
859
switch(sret){
470
860
case GNUTLS_E_INTERRUPTED:
471
861
case GNUTLS_E_AGAIN:
472
862
break;
473
863
case GNUTLS_E_REHANDSHAKE:
474
ret = gnutls_handshake (es.session);
475
if (ret < 0){
476
fprintf(stderr, "\n*** Handshake failed ***\n");
477
gnutls_perror (ret);
478
retval = -1;
479
goto exit;
864
do {
865
ret = gnutls_handshake(session);
866
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
874
gnutls_perror(ret);
875
errno = EPROTO;
876
goto mandos_end;
480
877
}
481
878
break;
482
879
default:
483
880
fprintf(stderr, "Unknown error while reading data from"
484
" encrypted session with mandos server\n");
485
retval = -1;
486
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
487
goto exit;
881
" encrypted session with Mandos server\n");
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
884
goto mandos_end;
488
885
}
489
886
} else {
490
buffer_length += (size_t) ret;
491
}
492
}
493
494
if (buffer_length > 0){
887
buffer_length += (size_t) sret;
888
}
889
}
890
891
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
893
}
894
895
if(quit_now){
896
errno = EINTR;
897
goto mandos_end;
898
}
899
900
do {
901
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
902
if(quit_now){
903
errno = EINTR;
904
goto mandos_end;
905
}
906
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
907
908
if(buffer_length > 0){
909
ssize_t decrypted_buffer_size;
495
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
496
911
buffer_length,
497
&decrypted_buffer,
498
certdir);
499
if (decrypted_buffer_size >= 0){
912
&decrypted_buffer);
913
if(decrypted_buffer_size >= 0){
914
915
written = 0;
500
916
while(written < (size_t) decrypted_buffer_size){
501
ret = (int)fwrite (decrypted_buffer + written, 1,
502
(size_t)decrypted_buffer_size - written,
503
stdout);
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
ret = (int)fwrite(decrypted_buffer + written, 1,
923
(size_t)decrypted_buffer_size - written,
924
stdout);
504
925
if(ret == 0 and ferror(stdout)){
926
int e = errno;
505
927
if(debug){
506
928
fprintf(stderr, "Error writing encrypted data: %s\n",
507
929
strerror(errno));
508
930
}
509
retval = -1;
510
break;
931
errno = e;
932
goto mandos_end;
511
933
}
512
934
written += (size_t)ret;
513
935
}
514
free(decrypted_buffer);
515
} else {
936
retval = 0;
937
}
938
}
939
940
/* Shutdown procedure */
941
942
mandos_end:
943
{
944
int e = errno;
945
free(decrypted_buffer);
946
free(buffer);
947
if(tcp_sd >= 0){
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
949
}
950
if(ret == -1){
951
if(e == 0){
952
e = errno;
953
}
954
perror_plus("close");
955
}
956
gnutls_deinit(session);
957
errno = e;
958
if(quit_now){
959
errno = EINTR;
516
960
retval = -1;
517
961
}
518
962
}
519
520
//shutdown procedure
521
522
if(debug){
523
fprintf(stderr, "Closing TLS session\n");
524
}
525
526
free(buffer);
527
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
528
exit:
529
close(tcp_sd);
530
gnutls_deinit (es.session);
531
gnutls_certificate_free_credentials (es.cred);
532
gnutls_global_deinit ();
533
963
return retval;
534
964
}
535
965
536
static AvahiSimplePoll *simple_poll = NULL;
537
static AvahiServer *server = NULL;
538
539
static void resolve_callback(
540
AvahiSServiceResolver *r,
541
AvahiIfIndex interface,
542
AVAHI_GCC_UNUSED AvahiProtocol protocol,
543
AvahiResolverEvent event,
544
const char *name,
545
const char *type,
546
const char *domain,
547
const char *host_name,
548
const AvahiAddress *address,
549
uint16_t port,
550
AVAHI_GCC_UNUSED AvahiStringList *txt,
551
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
552
AVAHI_GCC_UNUSED void* userdata) {
553
554
assert(r); /* Spurious warning */
966
static void resolve_callback(AvahiSServiceResolver *r,
967
AvahiIfIndex interface,
968
AvahiProtocol proto,
969
AvahiResolverEvent event,
970
const char *name,
971
const char *type,
972
const char *domain,
973
const char *host_name,
974
const AvahiAddress *address,
975
uint16_t port,
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
flags,
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
555
981
556
982
/* Called whenever a service has been resolved successfully or
557
983
timed out */
558
984
559
switch (event) {
985
if(quit_now){
986
return;
987
}
988
989
switch(event){
560
990
default:
561
991
case AVAHI_RESOLVER_FAILURE:
562
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
563
" type '%s' in domain '%s': %s\n", name, type, domain,
564
avahi_strerror(avahi_server_errno(server)));
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
565
995
break;
566
996
567
997
case AVAHI_RESOLVER_FOUND:
569
999
char ip[AVAHI_ADDRESS_STR_MAX];
570
1000
avahi_address_snprint(ip, sizeof(ip), address);
571
1001
if(debug){
572
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
573
" port %d\n", name, host_name, ip, port);
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
574
1005
}
575
int ret = start_mandos_communication(ip, port, interface);
576
if (ret == 0){
577
exit(EXIT_SUCCESS);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1008
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1010
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
578
1013
}
579
1014
}
580
1015
}
581
1016
avahi_s_service_resolver_free(r);
582
1017
}
583
1018
584
static void browse_callback(
585
AvahiSServiceBrowser *b,
586
AvahiIfIndex interface,
587
AvahiProtocol protocol,
588
AvahiBrowserEvent event,
589
const char *name,
590
const char *type,
591
const char *domain,
592
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
593
void* userdata) {
594
595
AvahiServer *s = userdata;
596
assert(b); /* Spurious warning */
597
598
/* Called whenever a new services becomes available on the LAN or
599
is removed from the LAN */
600
601
switch (event) {
1019
static void browse_callback(AvahiSServiceBrowser *b,
1020
AvahiIfIndex interface,
1021
AvahiProtocol protocol,
1022
AvahiBrowserEvent event,
1023
const char *name,
1024
const char *type,
1025
const char *domain,
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1030
1031
/* Called whenever a new services becomes available on the LAN or
1032
is removed from the LAN */
1033
1034
if(quit_now){
1035
return;
1036
}
1037
1038
switch(event){
1039
default:
1040
case AVAHI_BROWSER_FAILURE:
1041
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1045
return;
1046
1047
case AVAHI_BROWSER_NEW:
1048
/* We ignore the returned Avahi resolver object. In the callback
1049
function we free it. If the Avahi server is terminated before
1050
the callback function is called the Avahi server will free the
1051
resolver for us. */
1052
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1058
break;
1059
1060
case AVAHI_BROWSER_REMOVE:
1061
break;
1062
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1067
}
1068
break;
1069
}
1070
}
1071
1072
/* Signal handler that stops main loop after sigterm has been called */
1073
static void handle_sigterm(int sig){
1074
if(quit_now){
1075
return;
1076
}
1077
quit_now = 1;
1078
signal_received = sig;
1079
int old_errno = errno;
1080
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1083
}
1084
errno = old_errno;
1085
}
1086
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1188
}
1189
return 1;
1190
}
1191
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
int ret;
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1208
1209
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1213
}
1214
ret = avahi_simple_poll_iterate(s, -1);
1215
} else {
1216
if (debug){
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1218
}
1219
/* the current time */
1220
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1221
if(ret == -1){
1222
perror_plus("clock_gettime");
1223
return -1;
1224
}
1225
/* Calculating in ms how long time between now and server
1226
who we visted longest time ago. Now - last seen. */
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1231
1232
if (debug){
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1234
}
1235
1236
if(block_time <= 0){
1237
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1241
if(ret == 0){
1242
avahi_simple_poll_quit(mc.simple_poll);
1243
return 0;
1244
}
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1246
if(ret == -1){
1247
perror_plus("clock_gettime");
1248
return -1;
1249
}
1250
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1252
}
1253
1254
ret = avahi_simple_poll_iterate(s, (int)block_time);
1255
}
1256
if(ret != 0){
1257
if (ret > 0 or errno != EINTR) {
1258
return (ret != 1) ? ret : 0;
1259
}
1260
}
1261
}
1262
}
1263
1264
int main(int argc, char *argv[]){
1265
AvahiSServiceBrowser *sb = NULL;
1266
int error;
1267
int ret;
1268
intmax_t tmpmax;
1269
char *tmp;
1270
int exitcode = EXIT_SUCCESS;
1271
const char *interface = "";
1272
struct ifreq network;
1273
int sd = -1;
1274
bool take_down_interface = false;
1275
uid_t uid;
1276
gid_t gid;
1277
char tempdir[] = "/tmp/mandosXXXXXX";
1278
bool tempdir_created = false;
1279
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1280
const char *seckey = PATHDIR "/" SECKEY;
1281
const char *pubkey = PATHDIR "/" PUBKEY;
1282
1283
bool gnutls_initialized = false;
1284
bool gpgme_initialized = false;
1285
float delay = 2.5f;
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
1287
1288
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1289
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1290
1291
uid = getuid();
1292
gid = getgid();
1293
1294
/* Lower any group privileges we might have, just to be safe */
1295
errno = 0;
1296
ret = setgid(gid);
1297
if(ret == -1){
1298
perror_plus("setgid");
1299
}
1300
1301
/* Lower user privileges (temporarily) */
1302
errno = 0;
1303
ret = seteuid(uid);
1304
if(ret == -1){
1305
perror_plus("seteuid");
1306
}
1307
1308
if(quit_now){
1309
goto end;
1310
}
1311
1312
{
1313
struct argp_option options[] = {
1314
{ .name = "debug", .key = 128,
1315
.doc = "Debug mode", .group = 3 },
1316
{ .name = "connect", .key = 'c',
1317
.arg = "ADDRESS:PORT",
1318
.doc = "Connect directly to a specific Mandos server",
1319
.group = 1 },
1320
{ .name = "interface", .key = 'i',
1321
.arg = "NAME",
1322
.doc = "Network interface that will be used to search for"
1323
" Mandos servers",
1324
.group = 1 },
1325
{ .name = "seckey", .key = 's',
1326
.arg = "FILE",
1327
.doc = "OpenPGP secret key file base name",
1328
.group = 1 },
1329
{ .name = "pubkey", .key = 'p',
1330
.arg = "FILE",
1331
.doc = "OpenPGP public key file base name",
1332
.group = 2 },
1333
{ .name = "dh-bits", .key = 129,
1334
.arg = "BITS",
1335
.doc = "Bit length of the prime number used in the"
1336
" Diffie-Hellman key exchange",
1337
.group = 2 },
1338
{ .name = "priority", .key = 130,
1339
.arg = "STRING",
1340
.doc = "GnuTLS priority string for the TLS handshake",
1341
.group = 1 },
1342
{ .name = "delay", .key = 131,
1343
.arg = "SECONDS",
1344
.doc = "Maximum delay to wait for interface startup",
1345
.group = 2 },
1346
{ .name = "retry", .key = 132,
1347
.arg = "SECONDS",
1348
.doc = "Retry interval used when denied by the mandos server",
1349
.group = 2 },
1350
/*
1351
* These reproduce what we would get without ARGP_NO_HELP
1352
*/
1353
{ .name = "help", .key = '?',
1354
.doc = "Give this help list", .group = -1 },
1355
{ .name = "usage", .key = -3,
1356
.doc = "Give a short usage message", .group = -1 },
1357
{ .name = "version", .key = 'V',
1358
.doc = "Print program version", .group = -1 },
1359
{ .name = NULL }
1360
};
1361
1362
error_t parse_opt(int key, char *arg,
1363
struct argp_state *state){
1364
errno = 0;
1365
switch(key){
1366
case 128: /* --debug */
1367
debug = true;
1368
break;
1369
case 'c': /* --connect */
1370
connect_to = arg;
1371
break;
1372
case 'i': /* --interface */
1373
interface = arg;
1374
break;
1375
case 's': /* --seckey */
1376
seckey = arg;
1377
break;
1378
case 'p': /* --pubkey */
1379
pubkey = arg;
1380
break;
1381
case 129: /* --dh-bits */
1382
errno = 0;
1383
tmpmax = strtoimax(arg, &tmp, 10);
1384
if(errno != 0 or tmp == arg or *tmp != '\0'
1385
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1386
argp_error(state, "Bad number of DH bits");
1387
}
1388
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1389
break;
1390
case 130: /* --priority */
1391
mc.priority = arg;
1392
break;
1393
case 131: /* --delay */
1394
errno = 0;
1395
delay = strtof(arg, &tmp);
1396
if(errno != 0 or tmp == arg or *tmp != '\0'){
1397
argp_error(state, "Bad delay");
1398
}
1399
case 132: /* --retry */
1400
errno = 0;
1401
retry_interval = strtod(arg, &tmp);
1402
if(errno != 0 or tmp == arg or *tmp != '\0'
1403
or (retry_interval * 1000) > INT_MAX){
1404
argp_error(state, "Bad retry interval");
1405
}
1406
break;
1407
/*
1408
* These reproduce what we would get without ARGP_NO_HELP
1409
*/
1410
case '?': /* --help */
1411
argp_state_help(state, state->out_stream,
1412
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1413
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1414
case -3: /* --usage */
1415
argp_state_help(state, state->out_stream,
1416
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1417
case 'V': /* --version */
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
1419
exit(argp_err_exit_status);
1420
break;
1421
default:
1422
return ARGP_ERR_UNKNOWN;
1423
}
1424
return errno;
1425
}
1426
1427
struct argp argp = { .options = options, .parser = parse_opt,
1428
.args_doc = "",
1429
.doc = "Mandos client -- Get and decrypt"
1430
" passwords from a Mandos server" };
1431
ret = argp_parse(&argp, argc, argv,
1432
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1433
switch(ret){
1434
case 0:
1435
break;
1436
case ENOMEM:
602
1437
default:
603
case AVAHI_BROWSER_FAILURE:
604
605
fprintf(stderr, "(Browser) %s\n",
606
avahi_strerror(avahi_server_errno(server)));
607
avahi_simple_poll_quit(simple_poll);
608
return;
609
610
case AVAHI_BROWSER_NEW:
611
/* We ignore the returned resolver object. In the callback
612
function we free it. If the server is terminated before
613
the callback function is called the server will free
614
the resolver for us. */
615
616
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
617
type, domain,
618
AVAHI_PROTO_INET6, 0,
619
resolve_callback, s)))
620
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
621
avahi_strerror(avahi_server_errno(s)));
622
break;
623
624
case AVAHI_BROWSER_REMOVE:
625
break;
626
627
case AVAHI_BROWSER_ALL_FOR_NOW:
628
case AVAHI_BROWSER_CACHE_EXHAUSTED:
629
break;
630
}
631
}
632
633
/* Combines file name and path and returns the malloced new
634
string. some sane checks could/should be added */
635
static const char *combinepath(const char *first, const char *second){
636
size_t f_len = strlen(first);
637
size_t s_len = strlen(second);
638
char *tmp = malloc(f_len + s_len + 2);
639
if (tmp == NULL){
640
return NULL;
641
}
642
if(f_len > 0){
643
memcpy(tmp, first, f_len);
644
}
645
tmp[f_len] = '/';
646
if(s_len > 0){
647
memcpy(tmp + f_len + 1, second, s_len);
648
}
649
tmp[f_len + 1 + s_len] = '\0';
650
return tmp;
651
}
652
653
654
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
655
AvahiServerConfig config;
656
AvahiSServiceBrowser *sb = NULL;
657
int error;
658
int ret;
659
int returncode = EXIT_SUCCESS;
660
const char *interface = "eth0";
661
struct ifreq network;
662
int sd;
663
char *connect_to = NULL;
664
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
665
666
while (true){
667
static struct option long_options[] = {
668
{"debug", no_argument, (int *)&debug, 1},
669
{"connect", required_argument, 0, 'C'},
670
{"interface", required_argument, 0, 'i'},
671
{"certdir", required_argument, 0, 'd'},
672
{"certkey", required_argument, 0, 'c'},
673
{"certfile", required_argument, 0, 'k'},
674
{0, 0, 0, 0} };
675
676
int option_index = 0;
677
ret = getopt_long (argc, argv, "i:", long_options,
678
&option_index);
679
680
if (ret == -1){
681
break;
682
}
683
684
switch(ret){
685
case 0:
686
break;
687
case 'i':
688
interface = optarg;
689
break;
690
case 'C':
691
connect_to = optarg;
692
break;
693
case 'd':
694
certdir = optarg;
695
break;
696
case 'c':
697
certfile = optarg;
698
break;
699
case 'k':
700
certkey = optarg;
701
break;
702
default:
703
exit(EXIT_FAILURE);
704
}
705
}
706
707
certfile = combinepath(certdir, certfile);
708
if (certfile == NULL){
709
perror("combinepath");
710
returncode = EXIT_FAILURE;
711
goto exit;
712
}
713
714
certkey = combinepath(certdir, certkey);
715
if (certkey == NULL){
716
perror("combinepath");
717
returncode = EXIT_FAILURE;
718
goto exit;
719
}
720
1438
errno = ret;
1439
perror_plus("argp_parse");
1440
exitcode = EX_OSERR;
1441
goto end;
1442
case EINVAL:
1443
exitcode = EX_USAGE;
1444
goto end;
1445
}
1446
}
1447
1448
if(not debug){
1449
avahi_set_log_function(empty_log);
1450
}
1451
1452
if(interface[0] == '\0'){
1453
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1455
alphasort);
1456
if(ret >= 1){
1457
/* Pick the first good interface */
1458
interface = strdup(direntries[0]->d_name);
1459
if(debug){
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1461
}
1462
if(interface == NULL){
1463
perror_plus("malloc");
1464
free(direntries);
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
free(direntries);
1469
} else {
1470
free(direntries);
1471
fprintf(stderr, "Could not find a network interface\n");
1472
exitcode = EXIT_FAILURE;
1473
goto end;
1474
}
1475
}
1476
1477
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1478
from the signal handler */
1479
/* Initialize the pseudo-RNG for Avahi */
1480
srand((unsigned int) time(NULL));
1481
mc.simple_poll = avahi_simple_poll_new();
1482
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1484
exitcode = EX_UNAVAILABLE;
1485
goto end;
1486
}
1487
1488
sigemptyset(&sigterm_action.sa_mask);
1489
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1490
if(ret == -1){
1491
perror_plus("sigaddset");
1492
exitcode = EX_OSERR;
1493
goto end;
1494
}
1495
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1496
if(ret == -1){
1497
perror_plus("sigaddset");
1498
exitcode = EX_OSERR;
1499
goto end;
1500
}
1501
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1502
if(ret == -1){
1503
perror_plus("sigaddset");
1504
exitcode = EX_OSERR;
1505
goto end;
1506
}
1507
/* Need to check if the handler is SIG_IGN before handling:
1508
| [[info:libc:Initial Signal Actions]] |
1509
| [[info:libc:Basic Signal Handling]] |
1510
*/
1511
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1512
if(ret == -1){
1513
perror_plus("sigaction");
1514
return EX_OSERR;
1515
}
1516
if(old_sigterm_action.sa_handler != SIG_IGN){
1517
ret = sigaction(SIGINT, &sigterm_action, NULL);
1518
if(ret == -1){
1519
perror_plus("sigaction");
1520
exitcode = EX_OSERR;
1521
goto end;
1522
}
1523
}
1524
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1525
if(ret == -1){
1526
perror_plus("sigaction");
1527
return EX_OSERR;
1528
}
1529
if(old_sigterm_action.sa_handler != SIG_IGN){
1530
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1531
if(ret == -1){
1532
perror_plus("sigaction");
1533
exitcode = EX_OSERR;
1534
goto end;
1535
}
1536
}
1537
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1538
if(ret == -1){
1539
perror_plus("sigaction");
1540
return EX_OSERR;
1541
}
1542
if(old_sigterm_action.sa_handler != SIG_IGN){
1543
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1544
if(ret == -1){
1545
perror_plus("sigaction");
1546
exitcode = EX_OSERR;
1547
goto end;
1548
}
1549
}
1550
1551
/* If the interface is down, bring it up */
1552
if(strcmp(interface, "none") != 0){
721
1553
if_index = (AvahiIfIndex) if_nametoindex(interface);
722
1554
if(if_index == 0){
723
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
724
exit(EXIT_FAILURE);
725
}
726
727
if(connect_to != NULL){
728
/* Connect directly, do not use Zeroconf */
729
/* (Mainly meant for debugging) */
730
char *address = strrchr(connect_to, ':');
731
if(address == NULL){
732
fprintf(stderr, "No colon in address\n");
733
exit(EXIT_FAILURE);
734
}
735
errno = 0;
736
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
737
if(errno){
738
perror("Bad port number");
739
exit(EXIT_FAILURE);
740
}
741
*address = '\0';
742
address = connect_to;
743
ret = start_mandos_communication(address, port, if_index);
744
if(ret < 0){
745
exit(EXIT_FAILURE);
746
} else {
747
exit(EXIT_SUCCESS);
748
}
749
}
1556
exitcode = EX_UNAVAILABLE;
1557
goto end;
1558
}
1559
1560
if(quit_now){
1561
goto end;
1562
}
1563
1564
/* Re-raise priviliges */
1565
errno = 0;
1566
ret = seteuid(0);
1567
if(ret == -1){
1568
perror_plus("seteuid");
1569
}
1570
1571
#ifdef __linux__
1572
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1573
messages about the network interface to mess up the prompt */
1574
ret = klogctl(8, NULL, 5);
1575
bool restore_loglevel = true;
1576
if(ret == -1){
1577
restore_loglevel = false;
1578
perror_plus("klogctl");
1579
}
1580
#endif /* __linux__ */
750
1581
751
1582
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
752
if(sd < 0) {
753
perror("socket");
754
returncode = EXIT_FAILURE;
755
goto exit;
1583
if(sd < 0){
1584
perror_plus("socket");
1585
exitcode = EX_OSERR;
1586
#ifdef __linux__
1587
if(restore_loglevel){
1588
ret = klogctl(7, NULL, 0);
1589
if(ret == -1){
1590
perror_plus("klogctl");
1591
}
1592
}
1593
#endif /* __linux__ */
1594
/* Lower privileges */
1595
errno = 0;
1596
ret = seteuid(uid);
1597
if(ret == -1){
1598
perror_plus("seteuid");
1599
}
1600
goto end;
756
1601
}
757
strcpy(network.ifr_name, interface);
1602
strcpy(network.ifr_name, interface);
758
1603
ret = ioctl(sd, SIOCGIFFLAGS, &network);
759
1604
if(ret == -1){
760
761
perror("ioctl SIOCGIFFLAGS");
762
returncode = EXIT_FAILURE;
763
goto exit;
1605
perror_plus("ioctl SIOCGIFFLAGS");
1606
#ifdef __linux__
1607
if(restore_loglevel){
1608
ret = klogctl(7, NULL, 0);
1609
if(ret == -1){
1610
perror_plus("klogctl");
1611
}
1612
}
1613
#endif /* __linux__ */
1614
exitcode = EX_OSERR;
1615
/* Lower privileges */
1616
errno = 0;
1617
ret = seteuid(uid);
1618
if(ret == -1){
1619
perror_plus("seteuid");
1620
}
1621
goto end;
764
1622
}
765
1623
if((network.ifr_flags & IFF_UP) == 0){
766
1624
network.ifr_flags |= IFF_UP;
1625
take_down_interface = true;
767
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
768
1627
if(ret == -1){
769
perror("ioctl SIOCSIFFLAGS");
770
returncode = EXIT_FAILURE;
771
goto exit;
772
}
773
}
774
close(sd);
775
776
if (not debug){
777
avahi_set_log_function(empty_log);
778
}
779
780
/* Initialize the psuedo-RNG */
781
srand((unsigned int) time(NULL));
782
783
/* Allocate main loop object */
784
if (!(simple_poll = avahi_simple_poll_new())) {
785
fprintf(stderr, "Failed to create simple poll object.\n");
786
returncode = EXIT_FAILURE;
787
goto exit;
788
}
789
790
/* Do not publish any local records */
1628
take_down_interface = false;
1629
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
exitcode = EX_OSERR;
1631
#ifdef __linux__
1632
if(restore_loglevel){
1633
ret = klogctl(7, NULL, 0);
1634
if(ret == -1){
1635
perror_plus("klogctl");
1636
}
1637
}
1638
#endif /* __linux__ */
1639
/* Lower privileges */
1640
errno = 0;
1641
ret = seteuid(uid);
1642
if(ret == -1){
1643
perror_plus("seteuid");
1644
}
1645
goto end;
1646
}
1647
}
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1649
for(int i=0; i < delay * 4; i++){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_RUNNING){
1654
break;
1655
}
1656
struct timespec sleeptime = { .tv_nsec = 250000000 };
1657
ret = nanosleep(&sleeptime, NULL);
1658
if(ret == -1 and errno != EINTR){
1659
perror_plus("nanosleep");
1660
}
1661
}
1662
if(not take_down_interface){
1663
/* We won't need the socket anymore */
1664
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1665
if(ret == -1){
1666
perror_plus("close");
1667
}
1668
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1673
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
1676
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
errno = 0;
1680
if(take_down_interface){
1681
/* Lower privileges */
1682
ret = seteuid(uid);
1683
if(ret == -1){
1684
perror_plus("seteuid");
1685
}
1686
} else {
1687
/* Lower privileges permanently */
1688
ret = setuid(uid);
1689
if(ret == -1){
1690
perror_plus("setuid");
1691
}
1692
}
1693
}
1694
1695
if(quit_now){
1696
goto end;
1697
}
1698
1699
ret = init_gnutls_global(pubkey, seckey);
1700
if(ret == -1){
1701
fprintf(stderr, "init_gnutls_global failed\n");
1702
exitcode = EX_UNAVAILABLE;
1703
goto end;
1704
} else {
1705
gnutls_initialized = true;
1706
}
1707
1708
if(quit_now){
1709
goto end;
1710
}
1711
1712
if(mkdtemp(tempdir) == NULL){
1713
perror_plus("mkdtemp");
1714
goto end;
1715
}
1716
tempdir_created = true;
1717
1718
if(quit_now){
1719
goto end;
1720
}
1721
1722
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
1724
exitcode = EX_UNAVAILABLE;
1725
goto end;
1726
} else {
1727
gpgme_initialized = true;
1728
}
1729
1730
if(quit_now){
1731
goto end;
1732
}
1733
1734
if(connect_to != NULL){
1735
/* Connect directly, do not use Zeroconf */
1736
/* (Mainly meant for debugging) */
1737
char *address = strrchr(connect_to, ':');
1738
if(address == NULL){
1739
fprintf(stderr, "No colon in address\n");
1740
exitcode = EX_USAGE;
1741
goto end;
1742
}
1743
1744
if(quit_now){
1745
goto end;
1746
}
1747
1748
uint16_t port;
1749
errno = 0;
1750
tmpmax = strtoimax(address+1, &tmp, 10);
1751
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1752
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
1754
exitcode = EX_USAGE;
1755
goto end;
1756
}
1757
1758
if(quit_now){
1759
goto end;
1760
}
1761
1762
port = (uint16_t)tmpmax;
1763
*address = '\0';
1764
address = connect_to;
1765
/* Colon in address indicates IPv6 */
1766
int af;
1767
if(strchr(address, ':') != NULL){
1768
af = AF_INET6;
1769
} else {
1770
af = AF_INET;
1771
}
1772
1773
if(quit_now){
1774
goto end;
1775
}
1776
1777
while(not quit_now){
1778
ret = start_mandos_communication(address, port, if_index, af);
1779
if(quit_now or ret == 0){
1780
break;
1781
}
1782
sleep((int)retry_interval or 1);
1783
};
1784
1785
if (not quit_now){
1786
exitcode = EXIT_SUCCESS;
1787
}
1788
1789
goto end;
1790
}
1791
1792
if(quit_now){
1793
goto end;
1794
}
1795
1796
{
1797
AvahiServerConfig config;
1798
/* Do not publish any local Zeroconf records */
791
1799
avahi_server_config_init(&config);
792
1800
config.publish_hinfo = 0;
793
1801
config.publish_addresses = 0;
794
1802
config.publish_workstation = 0;
795
1803
config.publish_domain = 0;
796
1804
797
1805
/* Allocate a new server */
798
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
799
&config, NULL, NULL, &error);
800
801
/* Free the configuration data */
1806
mc.server = avahi_server_new(avahi_simple_poll_get
1807
(mc.simple_poll), &config, NULL,
1808
NULL, &error);
1809
1810
/* Free the Avahi configuration data */
802
1811
avahi_server_config_free(&config);
803
804
/* Check if creating the server object succeeded */
805
if (!server) {
806
fprintf(stderr, "Failed to create server: %s\n",
807
avahi_strerror(error));
808
returncode = EXIT_FAILURE;
809
goto exit;
810
}
811
812
/* Create the service browser */
813
sb = avahi_s_service_browser_new(server, if_index,
814
AVAHI_PROTO_INET6,
815
"_mandos._tcp", NULL, 0,
816
browse_callback, server);
817
if (!sb) {
818
fprintf(stderr, "Failed to create service browser: %s\n",
819
avahi_strerror(avahi_server_errno(server)));
820
returncode = EXIT_FAILURE;
821
goto exit;
822
}
823
824
/* Run the main loop */
825
826
if (debug){
827
fprintf(stderr, "Starting avahi loop search\n");
828
}
829
830
avahi_simple_poll_loop(simple_poll);
831
832
exit:
833
834
if (debug){
835
fprintf(stderr, "%s exiting\n", argv[0]);
836
}
837
838
/* Cleanup things */
839
if (sb)
840
avahi_s_service_browser_free(sb);
841
842
if (server)
843
avahi_server_free(server);
844
845
if (simple_poll)
846
avahi_simple_poll_free(simple_poll);
847
free(certfile);
848
free(certkey);
849
850
return returncode;
1812
}
1813
1814
/* Check if creating the Avahi server object succeeded */
1815
if(mc.server == NULL){
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
1818
exitcode = EX_UNAVAILABLE;
1819
goto end;
1820
}
1821
1822
if(quit_now){
1823
goto end;
1824
}
1825
1826
/* Create the Avahi service browser */
1827
sb = avahi_s_service_browser_new(mc.server, if_index,
1828
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1829
NULL, 0, browse_callback, NULL);
1830
if(sb == NULL){
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
1833
exitcode = EX_UNAVAILABLE;
1834
goto end;
1835
}
1836
1837
if(quit_now){
1838
goto end;
1839
}
1840
1841
/* Run the main loop */
1842
1843
if(debug){
1844
fprintf(stderr, "Starting Avahi loop search\n");
1845
}
1846
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
1848
if(debug){
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
1851
}
1852
1853
end:
1854
1855
if(debug){
1856
fprintf(stderr, "%s exiting\n", argv[0]);
1857
}
1858
1859
/* Cleanup things */
1860
if(sb != NULL)
1861
avahi_s_service_browser_free(sb);
1862
1863
if(mc.server != NULL)
1864
avahi_server_free(mc.server);
1865
1866
if(mc.simple_poll != NULL)
1867
avahi_simple_poll_free(mc.simple_poll);
1868
1869
if(gnutls_initialized){
1870
gnutls_certificate_free_credentials(mc.cred);
1871
gnutls_global_deinit();
1872
gnutls_dh_params_deinit(mc.dh_params);
1873
}
1874
1875
if(gpgme_initialized){
1876
gpgme_release(mc.ctx);
1877
}
1878
1879
/* cleans up the circular linked list of mandos servers the client has seen */
1880
if(mc.current_server != NULL){
1881
mc.current_server->prev->next = NULL;
1882
while(mc.current_server != NULL){
1883
server *next = mc.current_server->next;
1884
free(mc.current_server);
1885
mc.current_server = next;
1886
}
1887
}
1888
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
1892
errno = 0;
1893
ret = seteuid(0);
1894
if(ret == -1){
1895
perror_plus("seteuid");
1896
}
1897
if(geteuid() == 0){
1898
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1899
if(ret == -1){
1900
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
1902
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1904
if(ret == -1){
1905
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1906
}
1907
}
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
/* Lower privileges permanently */
1913
errno = 0;
1914
ret = setuid(uid);
1915
if(ret == -1){
1916
perror_plus("setuid");
1917
}
1918
}
1919
}
1920
1921
/* Removes the GPGME temp directory and all files inside */
1922
if(tempdir_created){
1923
struct dirent **direntries = NULL;
1924
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1926
if (ret > 0){
1927
for(int i = 0; i < ret; i++){
1928
direntry = direntries[i];
1929
char *fullname = NULL;
1930
ret = asprintf(&fullname, "%s/%s", tempdir,
1931
direntry->d_name);
1932
if(ret < 0){
1933
perror_plus("asprintf");
1934
continue;
1935
}
1936
ret = remove(fullname);
1937
if(ret == -1){
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1939
strerror(errno));
1940
}
1941
free(fullname);
1942
}
1943
}
1944
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
1946
free(direntries);
1947
if (ret == -1){
1948
perror_plus("scandir");
1949
}
1950
ret = rmdir(tempdir);
1951
if(ret == -1 and errno != ENOENT){
1952
perror_plus("rmdir");
1953
}
1954
}
1955
1956
if(quit_now){
1957
sigemptyset(&old_sigterm_action.sa_mask);
1958
old_sigterm_action.sa_handler = SIG_DFL;
1959
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1960
&old_sigterm_action,
1961
NULL));
1962
if(ret == -1){
1963
perror_plus("sigaction");
1964
}
1965
do {
1966
ret = raise(signal_received);
1967
} while(ret != 0 and errno == EINTR);
1968
if(ret != 0){
1969
perror_plus("raise");
1970
abort();
1971
}
1972
TEMP_FAILURE_RETRY(pause());
1973
}
1974
1975
return exitcode;
851
1976
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0